Battery cell, battery device, and electrical device

Abstract

Provided are a battery cell (81), a battery device (80), and an electrical device. The battery cell (81) comprises: a casing (10), comprising a plurality of wall bodies enclosing an accommodating cavity (11), wherein at least one of the plurality of wall bodies is provided with a through-hole (12) in communication with the accommodating cavity (11), and the wall body among the plurality of wall that is provided with the through-hole (12) is defined as a first wall (13); an electrode assembly (20), located within the accommodating cavity (11); an electrode terminal (30), disposed in the through-hole (12) and electrically connected to the electrode assembly (20); a first insulating member (41), disposed on the side of the first wall (13) adjacent to the electrode assembly (20) and fixedly connected to the first wall (13); and a second insulating member (50), at least partially disposed on the side of the first wall (13) adjacent to the electrode assembly (20), and separately connected to the first insulating member (41) and the electrode terminal (30).

Description

Battery cells, battery packs and electrical devices Technical Field

[0001] This disclosure relates to the field of battery technology, and in particular to a battery cell, a battery device, and an electrical device. Background Technology

[0002] Secondary batteries, especially lithium-ion batteries, have advantages such as high voltage, high specific energy, long cycle life, being environmentally friendly and pollution-free, having a wide operating temperature range, and low self-discharge. They are widely used in portable electronic devices, energy storage devices, and power equipment for large new energy electric vehicles, and are of great significance in solving environmental pollution and the energy crisis. With the widespread application of lithium-ion batteries, battery reliability has become a key concern for manufacturers. Summary of the Invention

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

[0004] The housing includes a receiving cavity, the housing including at least one first wall having a through hole;

[0005] The electrode assembly is located within the receiving cavity;

[0006] Electrode terminals are at least partially disposed in the through hole and electrically connected to the electrode assembly;

[0007] A first insulating element is disposed on the side of the first wall adjacent to the electrode assembly and is fixedly connected to the first wall; and

[0008] A second insulating element is disposed at least partially on the side of the first wall adjacent to the electrode assembly and is connected to both the first insulating element and the electrode terminal.

[0009] In this embodiment, a first insulating member and a second insulating member are provided on the side of the first wall adjacent to the electrode assembly. The connection between the first insulating member and the electrode terminal is realized through the second insulating member, so that the electrode terminal can be fixed relative to the first insulating member. The stability of the electrode terminal is improved by effectively limiting the electrode terminal. Moreover, the second insulating member can be formed or assembled after the electrode terminal is inserted into the through hole, which effectively reduces the risk of poor electrode terminal limiting due to processing error or assembly error, thereby effectively improving the reliability of the battery cell.

[0010] In some embodiments, the first insulating member is located outside the through hole in at least one vertical direction of the first direction, and the second insulating member abuts against the first insulating member and the electrode terminal on both sides along at least one vertical direction of the first direction, wherein the first direction is the thickness direction of the first wall.

[0011] In this embodiment, by having the second insulating member abut against the first insulating member and the electrode terminal on both sides in at least one direction perpendicular to the thickness direction of the first wall, the electrode terminal can be fixed relative to the first insulating member fixedly connected to the first wall in that direction, thereby reducing or eliminating the possibility of the electrode terminal swaying laterally relative to the through hole, which is beneficial to achieving a better sealing and fixing effect of the electrode terminal.

[0012] In some embodiments, the battery cell further includes:

[0013] A sealing element is located between the inner wall surface of the through hole and the electrode terminal is located between the outer wall surface of the through hole;

[0014] The second insulating element includes a first protrusion located between the inner wall surface and the outer wall surface.

[0015] In this embodiment, the first protrusion, by engaging with the gap between the outer wall surface and the inner wall surface, can limit the relative position of the outer wall surface and the inner wall surface, thereby enabling the seal in the gap to maintain a stable degree of compression and sealing, thus making the sealing effect more stable and reliable.

[0016] In some embodiments, the first protrusion extends toward the seal and abuts against the seal in the first direction.

[0017] In this embodiment, the sealing element can be held between the outer wall surface and the inner wall surface by the abutting action of the first protrusion, thereby further improving the sealing effect.

[0018] In some embodiments, the first protrusion includes a first annular embedding portion, the inner wall surface and the outer wall surface having a gap in at least one vertical direction in the first direction, the portion of the gap on the side of the seal adjacent to the electrode assembly being defined as a first gap portion, the first annular embedding portion engaging with the first gap portion.

[0019] In this embodiment, the first annular embedded portion fitted within the gap can more uniformly limit the sealing element in the circumferential direction and further improve the sealing performance in conjunction with the sealing element. The first annular embedded portion can form an insulating barrier between the inner wall surface and the outer wall surface, reducing the risk of short circuits that may occur due to the lack of insulating barrier between the electrode terminal and the through hole.

[0020] In some embodiments, the battery cell further includes:

[0021] A third insulating element is disposed at least partially on the side of the first wall away from the electrode assembly and is fixedly connected to the electrode terminal.

[0022] In this embodiment, by fixing the electrode terminal to the third insulating member, the electrode terminal can be fixed on the side of the first wall away from the electrode assembly. This makes the electrode terminal less prone to shaking within the through hole, thereby improving the stability of the electrical connection between the electrode terminal and the outside, and also improving the sealing reliability of the seal. The second annular protrusion can form an insulating barrier between the inner wall surface and the outer wall surface, reducing the risk of short circuits that may occur due to the lack of insulating barrier between the electrode terminal and the through hole.

[0023] In some embodiments, the material strength of the second insulating member is greater than or equal to the material strength of the first insulating member.

[0024] In this embodiment, by making the material strength of the second insulating member greater than or equal to the material strength of the first insulating member, the insulation performance can be satisfied while also meeting the material strength required to fix the position of the electrode terminal relative to the first insulating member.

[0025] In some embodiments, the material of the second insulating member includes at least one of polyphenylene sulfide material and liquid crystal polymer material.

[0026] In this embodiment, the polyphenylene sulfide material possesses excellent physical and mechanical properties and electrical insulation properties, which can meet the requirements of the second insulating component in terms of insulation performance and material strength. The liquid crystal polymer material has high material strength and good electrical insulation properties, which can meet the requirements of the second insulating component in terms of insulation performance and material strength.

[0027] In some embodiments, the second insulating element and the electrode terminal are integrally formed on the first wall.

[0028] In this embodiment, the second insulating component and the electrode terminal are conveniently integrally formed on the first wall by injection molding or other integral molding methods. During the molding process, the second insulating component can be fixedly connected to the first insulating component, the electrode terminal and the through hole respectively, which is beneficial to improving manufacturing efficiency and reducing manufacturing and assembly steps.

[0029] In some embodiments, the second insulating member and the first wall form an anti-rotation fit.

[0030] In this embodiment, by forming an anti-rotation fit between the second insulating member and the first wall, the rotation of the second insulating member and the electrode terminal fixedly connected to the second insulating member relative to the through hole can be effectively suppressed. In this way, even if the electrode terminal is subjected to the torsional torque of the connecting component on the outside of the battery cell, it will remain unrotated relative to the through hole, thereby reducing the adverse effects on the sealing performance and the inside of the battery cell.

[0031] In some embodiments, the first wall and the second insulating member form an anti-rotation fit with each other through a concave-convex interlocking structure at the outer periphery of the opening of the through hole.

[0032] In this embodiment, the anti-rotation effect can be more effective by the anti-rotation fit formed by the concave-convex interlocking structure of the first wall and the second insulating member.

[0033] In some embodiments, the first wall has an annular flange protruding in a direction parallel to the first direction on the outer periphery of the opening of the through hole, the annular flange having at least one notch, the second insulating member covering the annular flange and having at least one second protrusion engaging with the at least one notch.

[0034] In this embodiment, by covering the annular flange with the second insulating member and engaging with the notch of the annular flange provided on the outer periphery of the through hole of the first wall through the second protrusion, a more reliable fixed connection can be formed between the second insulating member and the first wall, and an anti-rotation effect can be achieved.

[0035] In some embodiments, the annular flange has a plurality of notches arranged circumferentially, and the second insulating member has a plurality of second protrusions arranged circumferentially, the plurality of second protrusions corresponding to the plurality of notches.

[0036] In this embodiment, by arranging multiple notches circumferentially on the annular flange and by having multiple second protrusions engage with the multiple notches one-to-one, the torsional torque on the electrode terminal can be more evenly distributed in the circumferential direction, reducing the risk of deformation or damage to the electrode terminal or the first wall under a large torsional torque, thereby achieving a better anti-rotation effect.

[0037] In some embodiments, the annular flange has a closing wall on the side of the at least one notch adjacent to the through hole.

[0038] In this embodiment, the closed wall on the side of the notch adjacent to the through hole can form a continuous and closed structure with the part of the annular flange outside the notch. In this way, when the annular flange is fixedly connected to the second insulating member, not only can the anti-rotation function be realized, but the sealing range of the through hole in the thickness direction of the first wall can also be increased, which is conducive to further improving the reliability of the seal.

[0039] In one aspect of this disclosure, a battery device is provided, comprising: the aforementioned battery cell.

[0040] Battery devices using the aforementioned battery cells have superior reliability.

[0041] In one aspect of this disclosure, an electrical device is provided, comprising: the aforementioned battery device.

[0042] Electrical devices using the aforementioned battery device have superior reliability. Attached Figure Description

[0043] 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.

[0044] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein:

[0045] Figure 1 is a structural schematic diagram of some embodiments of the electrical appliance according to the present disclosure;

[0046] Figure 2 is an exploded structural diagram of some embodiments of the battery device according to the present disclosure;

[0047] Figure 3 is a schematic diagram of the installation structure of a battery cell according to some embodiments of the present disclosure;

[0048] Figure 4 is an exploded structural diagram of the embodiment shown in Figure 3;

[0049] Figure 5 is an exploded structural diagram of the top cover plate and its mounting structure in the embodiment shown in Figure 4.

[0050] 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.

[0051] Figure 7 is a schematic diagram of section AA in Figure 6;

[0052] Figure 8 is an enlarged schematic diagram of the area corresponding to circle B in Figure 7;

[0053] Figure 9 is a schematic diagram of the CC section in Figure 6;

[0054] Figure 10 is an enlarged schematic diagram of the area corresponding to circle D in Figure 9;

[0055] Figures 11(a) and (b) are schematic diagrams of the structure of the top cover and the second insulating member in some embodiments of the battery cell according to the present disclosure;

[0056] Figure 12 is a partial structural schematic diagram of the top cover sheet in some other embodiments of the battery cell according to the present disclosure.

[0057] 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.

[0058] 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; 13-First wall; 131-Annular flange; 1311-Notch; 1312-Sealing wall; 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-Outer wall surface; 41-First insulating element; 42-Third insulating element; 421-First annular protrusion; 422-Second annular protrusion; 50-Second insulating element; 51-First protrusion; 511-First annular embedded portion; 52-Second protrusion; 60-Sealing element; 71-Pressure relief component; 72-Injection port; 73-First connector; 74-Second connector; 80-Battery assembly; 81-Battery cell; 82-Box; 83-Box cover; 90-Vehicle; 91-Controller; 92-Motor; 93-Axle; 94-Wheel; x-First direction. Detailed Implementation

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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).

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] To improve the internal space utilization of battery cells, some related technologies employ a radial sealing structure between the terminal posts and terminal post holes on the top cover to reduce the space occupied by mechanical components.

[0071] Research has revealed that during terminal post installation, the terminal post needs to enter the terminal post hole on the top cover plate, and then the structure at the lower end of the terminal post needs to contact the lower plastic layer on the underside of the top cover plate to achieve a limiting effect on the lower side of the terminal post. However, since the lower plastic layer is formed before the terminal post is inserted, there is a possibility that it may not effectively match the terminal post due to processing or assembly errors. This could lead to poor limiting, resulting in decreased stability and sealing effect of the terminal post, thus affecting the reliability of the battery cell.

[0072] In view of this, the present disclosure provides a battery cell, a battery device, and an electrical device that can improve reliability in use.

[0073] In one aspect of this disclosure, a battery cell is provided, comprising:

[0074] The housing includes a receiving cavity, the housing including at least one first wall having a through hole;

[0075] The electrode assembly is located within the receiving cavity;

[0076] Electrode terminals are at least partially disposed in the through hole and electrically connected to the electrode assembly;

[0077] A first insulating element is disposed on the side of the first wall adjacent to the electrode assembly and is fixedly connected to the first wall; and

[0078] A second insulating element is disposed at least partially on the side of the first wall adjacent to the electrode assembly and is connected to both the first insulating element and the electrode terminal.

[0079] In this embodiment, a first insulating member and a second insulating member are provided on the side of the first wall adjacent to the electrode assembly. The connection between the first insulating member and the electrode terminal is realized through the second insulating member, so that the electrode terminal can be fixed relative to the first insulating member. The stability of the electrode terminal is improved by effectively limiting the electrode terminal. Moreover, the second insulating member can be formed or assembled after the electrode terminal is inserted into the through hole, which effectively reduces the risk of poor electrode terminal limiting due to processing error or assembly error, thereby effectively improving the reliability of the battery cell.

[0080] 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.

[0081] In some embodiments, the battery device may include a housing and individual battery cells, with the individual battery cells housed within the housing.

[0082] 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.

[0083] 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.

[0084] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] In some embodiments, multiple battery cells 81 may first be connected in series, parallel, or mixed to form a battery device module, and then the multiple battery device modules may be connected in series, parallel, or mixed to form a whole, which is housed in the housing 82. In other embodiments, all battery cells 81 are directly connected in series, parallel, or mixed together, and then the whole composed of all battery cells 81 is housed in the housing.

[0094] 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.

[0095] Referring to Figures 3-8, this disclosure provides a battery cell 81, including: a housing 10, an electrode assembly 20, electrode terminals 30, a first insulating member 41, and a second insulating member 50. The housing 10 includes a receiving cavity 11, and the housing 10 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 first insulating member 41 is disposed on the side of the first wall 13 adjacent to the electrode assembly 20 and is fixedly connected to the first wall 13. The second insulating member 50 is at least partially disposed on the side of the first wall 13 adjacent to the electrode assembly 20 and is connected to both the first insulating member 41 and the electrode terminals 30, respectively, for fixing the position of the electrode terminals 30 relative to the first insulating member 41.

[0096] 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.

[0097] 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 battery cells, such as hexagonal prismatic battery cells.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] The outer casing 10 includes at least one first wall 13, and the first wall 13 is provided with a through hole 12. 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 more through holes 12 can be provided on the first wall 13.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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).

[0106] 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 0.2 O2 (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.

[0107] In some embodiments, the negative electrode sheet may include a negative current collector substrate.

[0108] 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.).

[0109] 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.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] As an example, liquid electrolytes include electrolyte salts and solvents.

[0118] 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.

[0119] 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.

[0120] As an example, gel electrolytes include a polymer-based backbone network combined with an ionic liquid—a lithium salt.

[0121] As an example, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0122] 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.

[0123] 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.

[0124] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0125] 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.

[0126] 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.

[0127] Electrode terminals 30 are 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.

[0128] A sealing structure can be provided between the electrode terminal 30 and the through hole 12 to seal the gap between the electrode terminal 30 and the through hole 12, so that the electrolyte inside the battery cell 81 will not permeate to the outside through the gap or that external impurities will not enter the inside of the battery cell 81 through the gap.

[0129] The first insulating member 41 is disposed on the side of the first wall 13 adjacent to the electrode assembly 20 and is fixedly connected to the first wall 13. In FIG. 5, the first insulating member 41 is located on the lower side of the top cover plate 102, which serves as the first wall 13. It may be made of polypropylene (PP) or polyphenylene sulfide (PPS) material and is used to achieve, for example, insulation between the inside of the battery cell 81 and the top cover plate 102, and to form space for accommodating the tabs and connecting members for conversion.

[0130] The second insulating member 50 is at least partially disposed on the side of the first wall 13 adjacent to the electrode assembly 20, and is connected to the first insulating member 41 and the electrode terminal 30, respectively.

[0131] Compared to related technologies where electrode terminals are fixed by an integrally formed insulating member on the side of the first wall 13 adjacent to the electrode assembly 20, the first insulating member 41 and the second insulating member 50 in this embodiment are equivalent to a separate structure. The second insulating member 50 can be made independently of the first insulating member 41, for example, the second insulating member 50 can be assembled with the first insulating member 41 and the electrode terminal 30 or formed between the first insulating member 41 and the electrode terminal 30.

[0132] The second insulating member 50 connects the first insulating member 41 and the electrode terminal 30, thereby fixing the position of the electrode terminal 30 relative to the first insulating member 41. This fixing of the position of the electrode terminal 30 relative to the first insulating member 41 can be done in one or more directions, such as in the thickness direction of the first wall 13 (i.e., the first direction x), and / or in at least one direction perpendicular to the first direction x.

[0133] In this embodiment, a first insulating member 41 and a second insulating member 50 are provided on the side of the first wall 13 adjacent to the electrode assembly 20. The connection between the first insulating member 41 and the electrode terminal 30 is realized through the second insulating member 50, so that the electrode terminal 30 can be fixed relative to the first insulating member 41. The stability of the electrode terminal 30 is improved by effectively limiting the electrode terminal 30. Moreover, the second insulating member 50 can be formed or assembled after the electrode terminal 30 is inserted into the through hole 12, which effectively reduces the risk of poor limiting of the electrode terminal 30 due to processing errors or assembly errors, thereby effectively improving the reliability of the battery cell.

[0134] Referring to Figures 5 and 8, in some embodiments, the first insulating member 41 is located outside the through hole 12 in at least one vertical direction of the first direction x, and the second insulating member 50 abuts against the first insulating member 41 and the electrode terminal 30 on both sides along at least one vertical direction of the first direction x, where the first direction x is the thickness direction of the first wall 13.

[0135] In Figures 5 and 8, the first insulating member 41 has a through hole at a position corresponding to the through hole 12. The inner wall of the through hole surrounds the outer periphery of the through hole 12 so that the electrode terminal 30 can enter the through hole 12 through the through hole. The second insulating member 50 may be partially disposed in the gap region between the electrode terminal 30 and the through hole of the first insulating member 41, and abuts against the inner wall surface of the through hole and the outer contour of the electrode terminal 30, respectively, forming a fixing effect on the electrode terminal 30 in at least one direction perpendicular to the first direction x.

[0136] At least one direction perpendicular to the first direction x may include one direction, such as the direction of the line connecting the positive electrode terminal 30p and the negative electrode terminal 30n, or it may include multiple directions, such as the direction of the line connecting the positive electrode terminal 30p and the negative electrode terminal 30n and its perpendicular direction. Accordingly, the second insulating member 50 may include a structure continuously arranged in the circumferential direction of the electrode terminal 30 or multiple structures arranged at intervals.

[0137] In Figure 5, the second insulating member 50 forms a continuous ring around the outer periphery of the electrode terminal 30, which is equivalent to fixing the electrode terminal 30 relative to the first insulating member 41 in all directions perpendicular to the first direction x.

[0138] In this embodiment, by having the second insulating member 50 abut against the first insulating member 41 and the electrode terminal 30 on both sides of at least one vertical direction in the first direction x, the electrode terminal 30 can be fixed relative to the first insulating member 41 which is fixedly connected to the first wall 13 in that direction, thereby reducing or eliminating the possibility of the electrode terminal 30 swaying laterally relative to the through hole 12, which is beneficial to achieving a better sealing and fixing effect of the electrode terminal.

[0139] Referring to FIG8, in some embodiments, the battery cell 81 further includes a seal 60, which is located between the inner wall surface 121 of the through hole 12 and the electrode terminal 30 is located between the outer wall surface 31 of the through hole 12; wherein, the second insulating member 50 includes a first protrusion 51, which is located between the inner wall surface 121 and the outer wall surface 31.

[0140] The seal 60 can be made of insulating materials such as fluororubber, silicone, or plastic. The outer wall surface 31 here refers to the portion between the two dashed lines inside the electrode terminal in Figure 8, which is defined by the length range of the through hole 12. The seal 60 achieves a sealing fit between the inner wall surface 121 and the outer wall surface 31 by being pressed together.

[0141] Here, the first outer wall surface 31 refers to the outer wall surface of the electrode terminal 30 corresponding to the depth range of the through hole 12. As shown in Figure 8, the first outer wall surface 31 is the part between the two dotted lines inside the electrode terminal 30, which is defined by the depth range of the through hole 12.

[0142] In Figure 8, a circumferentially continuous or circumferentially spaced gap can be formed between the inner wall surface 121 and the outer wall surface 31. Depending on the shape of the gap, the sealing element 60 can be a circumferentially continuous sealing ring, or it can be a circumferentially discontinuous sealing block or sealing strip, or other forms. The first protrusion 51 of the second insulating element 50 can fit with the gap between the inner wall surface 121 and the outer wall surface 31, and the electrode terminal 30 is limited and fixed relative to the through hole 12 through contact with the inner wall surface 121 and the outer wall surface 31.

[0143] The first protrusion 51 can be set at one angular position in the circumferential direction of the outer wall surface 31, or it can be set at multiple angular positions in the circumferential direction of the outer wall surface 31. The first protrusion 51 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.

[0144] In this embodiment, the first protrusion 51, by engaging with the gap between the outer wall surface 31 and the inner wall surface 121, can limit the relative position of the outer wall surface 31 and the inner wall surface 121, thereby enabling the sealing member 60 in the gap to maintain a stable degree of compression and sealing, thus making the sealing effect more stable and reliable.

[0145] Referring to FIG8, in some embodiments, the first protrusion 51 extends toward the seal 60 and abuts against the seal 60 in the first direction x.

[0146] In Figure 8, the first protrusion 51 extends toward the seal 60 along the first direction x and abuts against the seal 60. In this way, in addition to defining the relative position of the outer wall surface 31 and the inner wall surface 121, it can also limit the seal 60 in the first direction x.

[0147] In this embodiment, the first protrusion 51 abuts against the seal 60, which allows the seal 60 to be held between the outer wall surface 31 and the inner wall surface 121, thereby further improving the sealing effect.

[0148] Referring to Figures 5 and 8, in some embodiments, the first protrusion 51 includes a first annular embedding portion 511, the inner wall surface 121 and the outer wall surface 31 having a gap in at least one vertical direction in the first direction x, the portion of the gap on the side of the seal 60 adjacent to the electrode assembly 20 is defined as a first gap portion, and the first annular embedding portion 511 engages with the first gap portion.

[0149] The seal 60 is disposed in the gap between the inner wall surface 121 and the outer wall surface 31. Along the first direction x, the first annular insert portion 511 is located within the portion of the gap on the side of the seal 60 adjacent to the electrode assembly 20, forming an engagement between the first annular insert portion 511 and the first gap portion. Here, engagement means that the first annular insert portion 511 and the first gap portion fit together tightly through complementary shapes.

[0150] In this embodiment, the first annular embedded portion 511, fitted within the gap, can more uniformly limit the sealing element 60 in the circumferential direction and further improve the sealing performance in conjunction with the sealing element 60. The first annular embedded portion 511 can form an insulating barrier between the inner wall surface 121 and the outer wall surface 31, reducing the risk of short circuits that may occur due to the lack of insulating barrier between the electrode terminal 30 and the through hole 12.

[0151] Referring to Figures 5 and 8, in some embodiments, the battery cell 81 further includes a third insulating member 42, which is at least partially disposed on the side of the first wall 13 away from the electrode assembly 20 and is fixedly connected to the electrode terminal 30.

[0152] The third insulating member 42 and the first insulating member 41 are respectively disposed on both sides of the first wall 13. The third insulating member 42 can limit and fix the portion of the electrode terminal 30 located on the side of the first wall 13 away from the electrode assembly 20. In Figure 8, the portion of the electrode terminal 30 protruding from the surface of the first wall 13 away from the electrode assembly 20 can be provided with an annular groove. The third insulating member 42 can include a first annular protrusion 421 that fits into the annular groove, thereby effectively limiting the electrode terminal in the first direction x and in various directions perpendicular to the first direction x. Furthermore, the third insulating member 42 can also cooperate with the second insulating member 50 to achieve double fixation of the electrode terminal 30 on both sides of the electrode terminal 30 along the first direction x, so that the electrode terminal 30 is more stably and reliably held in the through hole 12, and the compression state of the sealing member 60 can be kept stable, thereby achieving a more stable and reliable sealing effect.

[0153] In Figure 8, the third insulating member 42 may further include a second annular protrusion 422 located in the gap between the inner wall surface 121 and the outer wall surface 31. The second annular protrusion 422 may extend toward the seal 60 and abut against the seal 60.

[0154] The third insulating element 42 can be made of polypropylene (PP) or polyphenylene sulfide (PPS), and can be installed on the first wall 13 by injection molding or assembly. By using injection molding, the third insulating element 42 can be formed by molten material entering the annular groove of the electrode terminal 30 and the gap between the inner wall surface 121 and the outer wall surface 31, thereby forming an interlocking structure that fills the annular groove and the gap above the seal 60.

[0155] In this embodiment, the electrode terminal 30 is fixedly connected to the third insulating member 42 on the side of the first wall 13 away from the electrode assembly 20, making it less likely for the electrode terminal 30 to wobble within the through hole 12. This improves the stability of the electrical connection between the electrode terminal 30 and the outside, and also enhances the sealing reliability of the sealing member 60. The second annular protrusion 422 provides insulation between the inner wall surface 121 and the outer wall surface 31, reducing the risk of short circuits due to the lack of insulation between the electrode terminal 30 and the through hole 12.

[0156] In some embodiments, the material strength of the second insulating member 50 is greater than or equal to the material strength of the first insulating member 41.

[0157] Considering that the second insulating member 50, in addition to its insulating properties, also needs to fix the position of the electrode terminal 30 relative to the first insulating member 41 by connecting with the first insulating member 41 and the electrode terminal 30, the material strength requirement is higher than that of the first insulating member 41. Accordingly, the material strength of the second insulating member 50 can be greater than or equal to that of the first insulating member 41. Here, the second insulating member 50 can be made of the same type and specification as the first insulating member 41 to obtain the same material strength, or it can be made of a different type or the same type but different specification of material to make the material strength of the second insulating member 50 greater than that of the first insulating member 41.

[0158] In this embodiment, by making the material strength of the second insulating member 50 greater than or equal to the material strength of the first insulating member 41, the insulation performance can be satisfied while also meeting the material strength required to fix the position of the electrode terminal 30 relative to the first insulating member 41.

[0159] In some embodiments, the material of the second insulating member 50 includes at least one of polyphenylene sulfide material and liquid crystal polymer material.

[0160] In this embodiment, the polyphenylene sulfide material possesses excellent physical and mechanical properties and electrical insulation properties, which can meet the requirements of the second insulating component 50 in terms of insulation performance and material strength. The liquid crystal polymer material has high material strength and good electrical insulation properties, which can meet the requirements of the second insulating component 50 in terms of insulation performance and material strength.

[0161] Referring to FIG8, in some embodiments, the second insulating member 50 and the electrode terminal 30 are integrally formed on the first wall 13.

[0162] Taking the second insulating component 50 made of polyphenylene sulfide or liquid crystal polymer as an example, molten polyphenylene sulfide or liquid crystal polymer is injected into the mold, so that the polyphenylene sulfide or liquid crystal polymer enters and fills the gap formed between the first insulating component 41 and the electrode terminal 30, as well as the gap formed between the through hole 12 and the electrode terminal 30. In this way, after cooling, the second insulating component 50 can be integrally formed with the electrode terminal on the first wall 13, forming a stable and reliable fixed connection relationship between the second insulating component 50 and the first insulating component 41, the electrode terminal 30 and the through hole 12.

[0163] In this embodiment, the second insulating component and the electrode terminal are conveniently integrally formed on the first wall by injection molding or other integral molding methods. During the molding process, the second insulating component 50 is fixedly connected to the first insulating component 41, the electrode terminal 30 and the through hole 12, which helps to improve manufacturing efficiency and reduce manufacturing and assembly steps.

[0164] Figure 9 is a schematic diagram of the CC section in Figure 6. Figure 10 is an enlarged schematic diagram of the area corresponding to circle D in Figure 9. Figures 11(a) and (b) are schematic diagrams of the structure of the top cover and the second insulating member in some embodiments of the battery cell according to the present disclosure.

[0165] Referring to Figures 5-6 and 9-11, in some embodiments, the second insulating member 50 forms an anti-rotation fit with the first wall 13.

[0166] In Figure 6, cross sections AA and CC are shown at an angle to each other. The different cross sections result in different joint configurations between the first wall 13 and the second insulating member 50. That is, the joint between the first wall 13 and the second insulating member 50 is not uniform in the circumferential direction, thereby achieving an anti-rotation fit between the second insulating member 50 and the first wall 13. Here and in the following text, anti-rotation refers to suppressing the rotation of the second insulating member 50 relative to the first wall 13.

[0167] In this embodiment, by forming an anti-rotation fit between the second insulating member 50 and the first wall 13, the rotation of the second insulating member 50 and the electrode terminal 30 fixedly connected to the second insulating member 50 relative to the through hole 12 can be effectively suppressed. In this way, even if the electrode terminal 30 is subjected to the torsional torque of the connecting component outside the battery cell, it will remain unrotated relative to the through hole 12, thereby reducing the adverse effects on the sealing performance and the interior of the battery cell.

[0168] Referring to Figure 11, in some embodiments, the first wall 13 and the second insulating member 50 form an anti-rotation fit with each other through a concave-convex interlocking structure at the outer periphery of the opening of the through hole 12.

[0169] In Figure 11(a), the first wall 13 has a concave-convex structure in the area surrounding the opening of the through hole 12. In Figure 11(b), the second insulating member 50 also has a concave-convex structure at a position corresponding to the concave-convex structure of the first wall 13, and the two sets of concave-convex structures can form a concave-convex fitting structure that is mutually interlocked and not easily rotated. Here, the concave-convex fitting structure refers to the two sets of concave-convex structures being tightly fitted through the complementarity of their shapes. This concave-convex fitting structure can be formed by injection molding of the second insulating member 50, or by assembling the second insulating member 50 onto the first wall 13.

[0170] In this embodiment, the anti-rotation effect can be more effective by the anti-rotation fit formed by the first wall 13 and the second insulating member 50 through the concave-convex interlocking structure.

[0171] Referring to Figures 10 and 11, in some embodiments, the first wall 13 has an annular flange 131 protruding in a direction parallel to the first direction x around the opening of the through hole 12, the annular flange 131 having at least one notch 1311, the second insulating member 50 covering the annular flange 131 and having at least one second protrusion 52 engaging with the at least one notch 1311.

[0172] The annular flange 131 on the outer periphery of the first wall 13 at the opening of the through hole 12 protrudes relative to the surface of the first wall 13 on the side adjacent to the electrode assembly 20, which facilitates the further machining of a notch 1311 thereon. The notch 1311 can be formed directly on the annular flange 131 when forming the annular flange 131.

[0173] The annular flange 131 also helps to increase the overlap range between the electrode terminal 30 and the through hole 12 in the first direction x. This increases the height of the first protrusion 51 fitted within the gap between the electrode terminal 30 and the through hole 12, thereby increasing the limiting and insulating effect of the electrode terminal 30 relative to the through hole 12. The annular flange 131 can have one or more notches 1311. The multiple notches 1311 can be spaced at equal or non-equal angles, or symmetrically or asymmetrically.

[0174] In this embodiment, by covering the annular flange 131 with the second insulating member 50, and by engaging the second protrusion 52 with the notch 1311 of the annular flange 131 provided on the outer periphery of the through hole 12 of the first wall 13, the second insulating member 50 can form a more reliable fixed connection with the first wall 13 and achieve the anti-rotation effect.

[0175] Referring to FIG11, in some embodiments, the annular flange 131 has a plurality of notches 1311 arranged circumferentially, and the second insulating member 50 has a plurality of second protrusions 52 arranged circumferentially, the plurality of second protrusions 52 being fitted into the plurality of notches 1311 in a one-to-one correspondence.

[0176] Multiple notches 1311 can be arranged circumferentially on the annular flange 131, and the second protrusion 52 can have the same number as the notches 1311 so that they can be fitted into the notches one by one.

[0177] In this embodiment, by arranging multiple notches 1311 circumferentially on the annular flange 131 and by having multiple second protrusions 52 corresponding to and engaging with the multiple notches 1311, the torsional torque on the electrode terminal 30 can be more evenly distributed in the circumferential direction, reducing the risk of deformation or damage to the electrode terminal 30 or the first wall 13 under a large torsional torque, thereby achieving a better anti-rotation effect.

[0178] Figure 12 is a partial structural schematic diagram of the top cover sheet in some other embodiments of the battery cell according to the present disclosure.

[0179] Referring to FIG12, in some embodiments, the annular flange 131 has a closing wall 1312 on the side of the at least one notch 1311 adjacent to the through hole 12.

[0180] In Figure 12, the closed wall 1312 on the side of the notch 1311 adjacent to the through hole 12 can form a continuous and closed structure with the part of the annular flange 131 outside the notch 1311. In this way, when the annular flange 131 is fixedly connected to the second insulating member 50, not only can the anti-rotation function be realized, but the sealing range of the through hole 12 in the first direction x can also be increased, which is conducive to further improving the reliability of the seal.

[0181] 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.

[0182] 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.

[0183] In some specific embodiments, as shown in Figures 3-11, the battery cell 81 includes: a housing 10, an electrode assembly 20, electrode terminals 30, a first insulating member 41, a second insulating member 50, a sealing member 60, and a third insulating member 42. The top cover plate 102 in the housing 10 serves as a first wall 13 and has a through hole 12. The electrode assembly 20 is located within the receiving cavity 11. The electrode terminals 30 are disposed in the through hole 12 and are electrically connected to the electrode assembly 20.

[0184] A first insulating member 41 is disposed on the side of the first wall 13 adjacent to the electrode assembly 20 and is fixedly connected to the first wall 13. A second insulating member 50 is disposed on the side of the first wall 13 adjacent to the electrode assembly 20 and is connected to the first insulating member 41 and the electrode terminal 30 respectively, for fixing the position of the electrode terminal 30 relative to the first insulating member 41.

[0185] The first insulating member 41 is located outside the through hole 12 in at least one direction perpendicular to the thickness direction of the first wall 13. The second insulating member 50 abuts against the first insulating member 41 and the electrode terminal 30 on both sides along at least one direction perpendicular to the thickness direction of the first wall 13. The material strength of the second insulating member 50 is greater than that of the first insulating member 41, and the material of the second insulating member 50 includes polyphenylene sulfide or liquid crystal polymer.

[0186] The sealing member 60 is located between the inner wall surface 121 of the through hole 12 and the outer wall surface 31 of the electrode terminal 30 located within the through hole 12, so that the inner wall surface 121 and the outer wall surface 31 are in a sealing fit. The second insulating member 50 includes a first protrusion 51 located between the inner wall surface 121 and the outer wall surface 31 to define the relative position of the outer wall surface 31 and the inner wall surface 121, and the first protrusion 51 extends toward the sealing member 60 and abuts against the sealing member 60 in the thickness direction of the first wall 13.

[0187] The first protrusion 51 includes a first annular embedded portion 511. The gap between the inner wall surface 121 and the outer wall surface 31 on the side of the seal 60 adjacent to the electrode assembly 20 is defined as a first gap portion, and the first annular embedded portion 511 is fitted into the first gap portion. The second insulating member 50 fills the gaps formed between the electrode terminal 30 and the through hole 12 and between the electrode terminal 30 and the first insulating member 41 by injection molding.

[0188] The third insulating member 42 is disposed on the side of the first wall 13 away from the electrode assembly 20 and is fixedly connected to the electrode terminal 30 to fix the electrode terminal 30 on the side of the first wall 13 away from the electrode assembly 20.

[0189] The first wall 13 forms an anti-rotation fit with the second insulating member 50 at the outer periphery of the opening of the through hole 12 through a concave-convex interlocking structure. The first wall 13 has an annular flange 131 protruding in a direction parallel to the thickness direction of the first wall 13 at the outer periphery of the opening of the through hole 12. The annular flange 131 has at least one notch 1311. The second insulating member 50 covers the annular flange 131 and has at least one second protrusion 52 that engages with the at least one notch 1311.

[0190] The annular flange 131 has a plurality of notches 1311 arranged circumferentially, and the second insulating member 50 has a plurality of second protrusions 52 arranged circumferentially, the plurality of second protrusions 52 being fitted into the plurality of notches 1311 in a one-to-one correspondence.

[0191] When assembling the electrode terminals 30, sealing elements 60, and various insulating elements on the top cover plate 102, the following steps may be referenced, but are not limited to: First, the top cover plate 102 and the first insulating element 41 are fixedly connected by heat fusion. Then, the electrode terminals 30 with the sealing elements 60 are inserted into the electrode terminal 30 holes on the top cover plate 102. Next, the third insulating element 42 is formed by injection molding to fix the electrode terminals 30 on the top cover plate 102. Then, the second insulating element 50 is formed by injection molding to connect the first insulating element 41 and the electrode terminals 30, and to fill the gaps between the first insulating element 41 and the electrode terminals 30, as well as between the through hole 12 and the electrode terminals 30.

[0192] 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.

[0193] 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); Electrode terminals (30) are at least partially disposed in the through hole (12) and electrically connected to the electrode assembly (20); A first insulating member (41) is disposed on the side of the first wall (13) adjacent to the electrode assembly (20) and is fixedly connected to the first wall (13); and A second insulating member (50) is disposed at least partially on the side of the first wall (13) adjacent to the electrode assembly (20) and is connected to the first insulating member (41) and the electrode terminal (30), respectively.

2. The battery cell (81) according to claim 1, wherein, The first insulating member (41) is located outside the through hole (12) in at least one vertical direction of the first direction (x), and the second insulating member (50) abuts against the first insulating member (41) and the electrode terminal (30) on both sides along at least one vertical direction of the first direction (x), wherein the first direction (x) is the thickness direction of the first wall (13).

3. The battery cell (81) according to claim 1 or 2 further comprises: A sealing element (60) is located between the inner wall surface (121) of the through hole (12) and the electrode terminal (30) is located between the outer wall surface (31) of the through hole (12); The second insulating member (50) includes a first protrusion (51) located between the inner wall surface (121) and the outer wall surface (31).

4. The battery cell (81) according to claim 3, wherein, The first protrusion (51) extends toward the seal (60) and abuts against the seal (60) in the first direction (x).

5. The battery cell (81) according to claim 3 or 4, wherein, The first protrusion (51) includes a first annular embedding portion (511), the inner wall surface (121) and the outer wall surface (31) having a gap in at least one vertical direction in the first direction (x), the portion of the gap on the side of the seal (60) adjacent to the electrode assembly (20) is defined as a first gap portion, and the first annular embedding portion (511) engages with the first gap portion.

6. The battery cell (81) according to any one of claims 3-5 further comprises: A third insulating element (42) is disposed at least partially on the side of the first wall (13) away from the electrode assembly (20) and is fixedly connected to the electrode terminal (30).

7. The battery cell (81) according to any one of claims 1-6, wherein, The material strength of the second insulating element (50) is greater than or equal to the material strength of the first insulating element (41).

8. The battery cell (81) according to any one of claims 1-7, wherein, The material of the second insulating element (50) includes at least one of polyphenylene sulfide material and liquid crystal polymer material.

9. The battery cell (81) according to any one of claims 1-8, wherein, The second insulating member (50) and the electrode terminal (30) are integrally formed on the first wall (13).

10. The battery cell (81) according to any one of claims 1-9, wherein, The second insulating element (50) forms an anti-rotation fit with the first wall (13).

11. The battery cell (81) according to claim 10, wherein, The first wall (13) and the second insulating member (50) form an anti-rotation fit on the outer periphery of the opening of the through hole (12) through a concave-convex interlocking structure.

12. The battery cell (81) according to claim 11, wherein, The first wall (13) has an annular flange (131) protruding in a direction parallel to the first direction on the outer periphery of the opening of the through hole (12), the annular flange (131) having at least one notch (1311), the second insulating member (50) covering the annular flange (131) and having at least one second protrusion (52) engaging with the at least one notch (1311).

13. The battery cell (81) according to claim 12, wherein, The annular flange (131) has a plurality of notches (1311) arranged in the circumferential direction, and the second insulating member (50) has a plurality of second protrusions (52) arranged in the circumferential direction, and the plurality of second protrusions (52) are fitted into the plurality of notches (1311) in a one-to-one correspondence.

14. The battery cell (81) according to any one of claims 12-13, wherein, The annular flange (131) has a closed wall (1312) on the side of the at least one notch (1311) adjacent to the through hole (12).

15. A battery device (80), comprising: The battery cell (81) according to any one of claims 1-14.

16. An electrical appliance, comprising: The battery device (80) according to claim 15.

Images