Battery cell, battery and electrical device

Abstract

Battery cell comprising the following: a housing comprising a wall, wherein the wall has an electrode guide opening; an electrode arrangement which is incorporated in the housing, wherein the electrode arrangement comprises a pole flag; an electrode connection which is electrically connected to the pole flag, wherein the electrode connection comprises a connection body extending through the electrode guide opening and a fastening part connected to the connection body; an insulating element arranged around the terminal body, wherein at least part of the insulating element is arranged between the mounting part and the wall to electrically insulate the mounting part and the wall; a protective element arranged around the terminal body and in contact with the insulating element, wherein the tensile strength of the protective element is greater than the tensile strength of the insulating element.

Description

Technical field

[0001] The present application relates to the technical field of batteries. More precisely, it relates to a battery cell, a battery, and an electrical device. State of the art

[0002] Battery cells are characterized by high capacity and long lifespan and are therefore frequently used in electronic devices such as mobile phones, laptops, electric vehicles, electric aircraft, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools.

[0003] Improving the reliability of battery cells is a key research focus in the development of battery technology. Summary

[0004] The present application relates to a battery cell, a battery, and an electrical device. The cycle performance of the battery cell of the present application can be further improved.

[0005] In a first aspect, the embodiments of the present application provide a battery cell. The battery cell comprises an electrode assembly, a housing, an electrode terminal, an insulating element, and a protective element. The housing comprises a wall having an electrode guide opening. The electrode assembly is received in the housing and includes a terminal tab. The electrode terminal is electrically connected to the terminal tab. The electrode terminal comprises a terminal body extending through the electrode guide opening and a fastening element connected to the terminal body. The insulating element is arranged around the terminal body; at least a portion of the insulating element is positioned between the fastening element and the wall to electrically insulate the fastening element and the wall.The protective element is arranged around the terminal body and is in contact with the insulating element, with the tensile strength of the protective element being greater than the tensile strength of the insulating element.

[0006] The protective element surrounds the outer circumference of the terminal body. During manufacturing or use of the battery cell, the protective element limits the extent of deformation and movement of the terminal body in the radial direction. This reduces deformation of the insulating element under the force exerted by the terminal body, decreases the risk of cracking in the insulating element, and improves the reliability of the battery cell. Compared to the insulating element, the protective element exhibits higher tensile strength and is less susceptible to deformation and cracking under the force exerted by the terminal body. This reduces the risk of protective element failure and improves the reliability of the battery cell.

[0007] In some embodiments, the tensile strength of the protective element is greater than the tensile strength of the electrode connection. The protective element can fix the connection body and reduce its deformation.

[0008] In some embodiments, the protective element is made of metal or ceramic. Metal and ceramic have higher tensile strength, which increases the reliability of the protective element and reduces the risk of cracking.

[0009] In some embodiments, the protective element has a first through-hole, the insulating element has a second through-hole, and the terminal body is guided through the first through-hole, the second through-hole, and the electrode guide opening. The provision of the first and second through-holes facilitates the passage of the terminal body through the protective element and the insulating element.

[0010] In some embodiments, at least part of the protective element projects inwards along the radial direction of the electrode guide opening beyond the bore wall of the second through-hole. The portion of the protective element projecting inwards from the bore wall of the second through-hole can limit the deformation or movement of the terminal body, reduce the risk of the terminal body pressing directly against the bore wall of the second through-hole, reduce the elongation of the insulating element along the radial direction of the electrode guide opening, reduce the risk of cracking in the insulating element, and improve the reliability of the battery cell.

[0011] In some embodiments, at least part of the protective element projects inwards along the radial direction of the electrode guide opening beyond the bore wall of the electrode guide opening. The portion of the protective element that projects inwards beyond the bore wall of the electrode guide opening can limit the deformation or displacement of the terminal body, thereby reducing the risk of the terminal body compressing the wall, thus lowering the short-circuit risk to some extent, and increasing the reliability of the battery cell.

[0012] In some embodiments, the first through-hole, the second through-hole and the electrode guide opening are arranged coaxially.

[0013] The coaxial arrangement of the first through-hole, the second through-hole and the electrode guide opening makes it easier to guide the connection body through the first through-hole, the second through-hole and the electrode guide opening simultaneously, thereby simplifying the structural requirements for the connection body and reducing the assembly effort.

[0014] In some embodiments, at least part of the bore wall of the first through-bore rests against the outer circumference of the connecting body.

[0015] When the battery cell is subjected to an external shock, the deflection of the terminal body along the radial direction of the electrode guide opening is reduced. The bore wall of the first through-hole rests directly against the outer circumference of the terminal body, thus effectively limiting its deformation.

[0016] In some embodiments, the portion of the protective element projecting beyond the bore wall of the second through-hole is ring-shaped. The protective element can thus limit the terminal body from the outer circumference, further reducing the risk of the terminal body pressing directly against the bore wall of the second through-hole. This reduces the expansion of the insulating element in the radial direction of the electrode guide opening, lowers the risk of cracking in the insulating element, and increases the reliability of the battery cell.

[0017] In some embodiments, the fastening part overlaps at least partially with the wall in the thickness direction of the wall, with at least a part of the insulating element and at least a part of the protective element being arranged between the wall and the fastening part.

[0018] The fastening element and the wall can clamp the insulating element and the protective element in the thickness direction, thereby increasing the stability of the insulating element and the protective element, reducing the displacement of the insulating element relative to the wall and the displacement of the protective element relative to the wall in the event of an external impact on the battery cell, and increasing reliability.

[0019] In some embodiments, the width of the projection of the mounting element onto the insulating element in the thickness direction is greater than or equal to 0.5 mm, so that the mounting element can effectively press the insulating element against the wall. This reduces the risk of displacement of the insulating element along the electrode guide opening and improves reliability.

[0020] In some embodiments, the protective element comprises a first part and a second part connected to the first part. The first part is arranged overlapping the insulating element in the thickness direction; the second part projects inwards in the radial direction of the electrode guide opening beyond the bore wall of the second through-bore.

[0021] The first part overlaps the insulating element in the thickness direction, allowing the wall and the mounting part to simultaneously clamp both the insulating element and the first part in the thickness direction. The second part limits the deformation or displacement of the terminal body, reducing the risk of the terminal body pressing directly against the bore wall of the second through-hole. This reduces the elongation of the insulating element in the radial direction of the electrode guide opening, lowers the risk of cracking in the insulating element, and increases the reliability of the battery cell.

[0022] In some embodiments, the projection of the second through-hole lies within the projection of the electrode guide opening in the thickness direction. This causes the second part to protrude inwards from the bore wall of the electrode guide opening, thereby reducing the risk of the terminal body pinching the wall, reducing wall deformation, and improving the reliability of the battery cell.

[0023] In some embodiments, the first part is embedded within the insulating element. By embedding the first part in the insulating element, the relative position between the insulating element and the protective element can be kept fixed during the battery cell assembly process. This allows the protective element to better limit deformation of the electrode connection during assembly, thus better protecting the insulating element and reducing the risk of cracking in the insulating element.

[0024] In some embodiments, at least part of the first part is positioned between the fastening element and the insulating element in the thickness direction. The fastening element can compress the insulating element through the protective element, thereby providing a protective function. This reduces the risk of the fastening element crushing the insulating element and improves reliability.

[0025] In some embodiments, the insulating element comprises an insulating body and an insulating projection. In the thickness direction, the second through-hole extends through the insulating body. At least a portion of the insulating body is positioned between the mounting part and the wall. The insulating projection extends beyond the surface of the insulating body facing away from the wall. At least a portion of the protective element is positioned in the thickness direction between the mounting part and the insulating body, and in the radial direction of the second through-hole, between the insulating projection and the connecting body.

[0026] During installation of the protective element, the insulating protrusion can position the element, thus simplifying the assembly process. In the manufacture or use of battery cells, the insulating protrusion can restrict the movement of the protective element, thereby reducing its displacement and improving its reliability.

[0027] In some embodiments, the second through-hole has an opening diameter D1, the first through-hole a diameter D2, and the protective element an outer diameter D3; the insulating projection is annular and has an inner diameter D4. D1, D2, D3, and D4 satisfy the condition: D1-D2 > D4-D3.

[0028] D4-D3 relates to the displaceable offset of the protective element in the radial direction, and the amount by which the protective element projects radially inward beyond the bore wall of the second through-hole depends on the value D1-D2. In the embodiments of the present application, D4-D3 is limited to a smaller value than D1-D2, so that even in the event of a mounting deviation of the protective element, it can be ensured that the protective element projects to a certain extent radially inward beyond the bore wall of the second through-hole, thereby limiting the degree of deformation and the displacement range of the terminal body in its own radial direction, reducing the risk of cracking in the insulating element, and increasing the reliability of the battery cell.

[0029] In some embodiments, the electrode connection further comprises a limiting part surrounding the connection body, wherein the limiting part and the fastening part are arranged on opposite sides of the wall in the thickness direction of the wall. The limiting part and the fastening part can clamp the wall from both sides and thus secure the electrode connection to the wall part.

[0030] In some embodiments, the fastening part is arranged on the inside of the wall; or the fastening part is arranged on the outside of the wall.

[0031] In some embodiments, the fastening part is designed so that it is formed by deformation after the electrode connection has been passed through the electrode guide opening.

[0032] When the electrode connection is bent, the material flows into the bending area, causing the outer circumference of the electrode connection to expand; the protective element can limit the material flow during the forming process of the fastening part, reduce the radial expansion of the electrode connection, lower the risk of pressure failure of the insulating element during the forming process of the fastening part, and increase the reliability of the battery cell.

[0033] In some embodiments, the protective element is permanently bonded to the insulating element. During battery cell assembly, the protective element and the insulating element can be delivered together, eliminating the need for positioning and mounting the protective element, simplifying the assembly process, and reducing costs.

[0034] In some embodiments, the protective element and the insulating element are formed as a single unit. This one-piece construction can increase the bond strength between the insulating element and the protective element.

[0035] In some embodiments, the housing comprises a housing body and an end cover, wherein the housing body has an opening and the end cover covers the opening. The housing body comprises a bottom wall opposite the end cover, wherein the bottom wall is the wall.

[0036] In a second aspect of the embodiments of the present application, a battery is provided which comprises a battery cell according to any embodiment of the first aspect.

[0037] In a third aspect of the embodiments of the present application, an electrical device is further provided which includes a battery in the second aspect, wherein the battery serves to supply electrical energy. Description of the drawings

[0038] To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for their application in this application are briefly presented below. The drawings described below naturally represent only some embodiments of the present application. Qualified engineers can create further drawings based on these without additional design effort. Fig. Figure 1 is a schematic representation of the structure of a vehicle according to some embodiments of the present application; Fig. 2 is an exploded view of a battery according to some embodiments of the present application; Fig. Figure 3 is a schematic representation of the battery module made of Fig. 2; Fig. Figure 4 is a schematic representation of the structure of a battery cell according to the embodiments of the present application; Fig. Figure 5 is an exploded view of a battery cell made of Fig. 4; Fig. Figure 6 is a schematic sectional view of a battery cell according to an embodiment of the present application; Fig. Figure 7 is an enlarged representation of the area within the circle marking of Fig. 6; Fig. Figure 8 is an enlarged view of the area within the rectangle marker of Fig. 7; Fig. Figure 9 is a schematic representation of the insulating element and the protective element of a battery cell according to some embodiments of the present application; Fig. Figure 10 is an enlarged representation of the area within the circle marking of Fig. 9; Fig. 11 is a schematic representation of the structure of a battery cell according to some embodiments of the present application before the forming of the fastening part; Fig. Figure 12 is a schematic partial sectional view of a battery cell according to further embodiments of the present application; Fig. Figure 13 is an enlarged representation of the area within the circle marking of Fig. 12; Fig. Figure 14 is a schematic representation of the insulating element and the protective element of a battery cell according to some embodiments of the present application; Fig. Figure 15 is a schematic partial sectional view of a battery cell according to further embodiments of the present application; Fig. Figure 16 is a schematic partial sectional view of a battery cell according to further embodiments of the present application.

[0039] The following are the descriptions of the reference symbols: 1. Vehicles; 2. Battery; 3. Control unit; 4. Engine; 5. Box; 5a. First box section; 5b. Second box section; 5c. Receiving compartment; 6. Battery module; 7. Battery cell; 10. Electrode arrangement; 11. Pole flag; 20. Housing; 21. Housing body; 211. Bottom wall; 22. End cover; 23. Wall; 231. Electrode guide opening; 30. Electrode connection; 31. Connection body; 311. Second recess; 312. Third through-hole; 32. Mounting part; 33. Limiting part; 34. Third recess; 35. Fifth recess; 40. Insulating element; 41. Second through-hole; 42. Insulating body; 43. Insulating projection; 44. First recess; 45. Fourth recess; 50. Protective element; 51. First through-hole; 52. First part; 53. Second part; 60. Sealing element; 70. Sealing plate; 80. Current collector component; Z. Thickness direction. Detailed embodiment examples

[0040] To clarify the objectives, technical solutions, and advantages of the embodiments presented in this application, the technical solutions of the embodiments are described in detail below with reference to the accompanying drawings. The described embodiments represent, of course, some, but not all, embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort fall within the scope of protection of this application.

[0041] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings commonly understood by a person skilled in the art in the field of this application; the terminology used in the description of this application serves solely to describe specific embodiments and is not intended to limit the application; the terms "comprising" and "with" and all variations thereof in the description, claims, and foregoing drawings of this application are intended to include non-exclusive inclusion. The terms "firstly," "secondly," etc., in the description, claims, or accompanying drawings of this application serve to distinguish between different objects and not to describe a particular sequence or a primary / secondary relationship.

[0042] The reference to "embodiment" here means that a particular feature, structure, or property described in connection with the embodiments may be included in at least one embodiment of the present application. The occurrence of this expression at different points in the description does not necessarily always refer to the same embodiment, nor is it an independent or alternative embodiment that excludes other embodiments.

[0043] The description of this application should point out that the terms "installation", "connection", "link", and "connection" are to be interpreted broadly, unless expressly stated otherwise and limited. They may, for example, denote a fixed, detachable, or inseparable connection; they may denote a direct or indirect connection via an intermediate medium; and they may denote the internal connection of two components. Those skilled in the art will be able to understand the precise meaning of the above terms in this application from the specific circumstances.

[0044] In this application, the term "and / or" merely describes the relationship between related objects and indicates that three relationships are possible. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Furthermore, the character " / " in this application generally indicates that the objects preceding and following it are in an "or" relationship.

[0045] In the embodiments of this application, the same reference numerals denote the same parts, and for the sake of brevity, detailed descriptions of the same parts in the various embodiments are omitted. It is understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative examples and are not intended to limit this application.

[0046] The term ‘plural’ used in the present application refers to two or more (including two).

[0047] In the embodiments of the present application, the battery cell can be a secondary battery which can be used continuously by activating active materials during charging after discharging.

[0048] The battery cell can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium-metal battery, a sodium-metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, or a lead-acid battery. The embodiments of the present application do not restrict this.

[0049] The battery cell can, for example, be cylindrical, prismatic, a pouch, or have another shape. Prismatic shapes include square, sheet-like, or multi-sided (e.g., hexagonal) forms. There are no specific restrictions for the present application.

[0050] The battery mentioned in the embodiments of the present application may be a single physical module comprising one or more battery cells to provide a higher voltage and capacity.

[0051] In some embodiments, the battery can be a battery module. If multiple battery cells are present, the multiple battery cells are arranged and secured in such a way that they form a battery module.

[0052] In some embodiments, the battery can be a battery pack comprising a box and battery cells, with the battery cells or battery module being housed in the box.

[0053] In some embodiments, the box can be part of the vehicle's body structure. For example, part of the box can form at least part of the vehicle floor. Alternatively, part of the box can form at least part of the vehicle's cross members and longitudinal members.

[0054] In some embodiments, the battery can be an energy storage device. The energy storage device includes energy storage containers and energy storage cabinets.

[0055] The battery cell comprises an electrode assembly and a housing, with the electrode assembly contained within the housing. The electrode assembly typically includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (for example, lithium ions) are reversibly inserted and removed between the positive and negative electrodes. The separator is positioned between the positive and negative electrodes, preventing a short circuit between them while allowing the passage of active ions.

[0056] The housing serves to hold and enclose the electrode assembly as well as other components such as the electrolyte. The housing can be made of steel, aluminum, plastic (such as polypropylene), a composite metal (such as a copper-aluminum composite), or an aluminum-plastic composite foil.

[0057] The battery cell typically also has electrode terminals on the casing. These electrode terminals serve to electrically connect to the electrode array in order to conduct the electrical energy it generates. To reduce the risk of short circuits, the electrode terminals and the casing must be insulated and separated from each other. The casing is typically provided with an insulating element, at least part of which is located between the electrode terminals and the casing to electrically isolate the electrode terminals and the casing.

[0058] During the manufacture or use of a battery cell, the insulating element can be squeezed and stretched by the electrode terminals, which can lead to cracks in the insulating element and thus to insulation failure, thereby affecting the reliability of the battery cell.

[0059] In view of this, the embodiments of the present application provide a technical concept in which a protective element with high tensile strength is provided on the outer circumference of the electrode connection in order to limit deformation or displacement of the electrode connection, to reduce the deformation of the insulating element under the action of the electrode connection, to lower the risk of cracking in the insulating element and to increase the reliability of the battery cell.

[0060] The technical solution described in the embodiments of the present application is applicable to batteries as well as to electrical devices that use the batteries.

[0061] The battery cell, battery, and electrical device disclosed in the embodiments of the present application can be used in power-consuming devices that utilize the battery as a power source, or in various energy storage systems that use the battery as an energy storage element. Electrical devices include, among others, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, ships, spacecraft, etc. Electric toys include, among others, stationary or mobile electric toys such as game consoles, electric toy cars, electric toy ships, and electric toy airplanes. Spacecraft include, among others, airplanes, rockets, space shuttles, and spacecraft.

[0062] In the following exemplary embodiments, a vehicle is used as an example for the electrical device to simplify the explanation.

[0063] Fig. Figure 1 is a schematic diagram of the structure of a vehicle according to some embodiments of the present application.

[0064] As in Fig. As shown in Figure 1, a battery 2 is arranged inside the vehicle 1, and the battery 2 can be located in the floor area, in the front area, or in the rear area of ​​the vehicle 1. The battery 2 can be used to supply power to the vehicle 1; for example, the battery 2 can serve as the operating power source for the vehicle 1.

[0065] The vehicle 1 can further comprise a control unit 3 and a motor 4, wherein the control unit 3 serves to control the battery 2 for supplying power to the motor 4, for example for the operating current requirement when starting, navigating and driving the vehicle 1.

[0066] In some embodiments of the present application, the battery 2 can not only serve as an operating current source for the vehicle 1, but can also be used as a drive current source for the vehicle 1 in order to completely or partially replace fuel or natural gas and to provide drive power for the vehicle 1.

[0067] Fig. Figure 2 is an exploded view of a battery according to some embodiments of the present application; as in Fig. As shown in 2, battery 2 comprises a box 5 and battery cells (in Fig. 2 not shown), with the battery cells contained in box 5.

[0068] Optionally, the box 5 serves to hold the battery cells, and the box 5 can be implemented in various structures. In some embodiments, the box 5 can comprise a first box part 5a and a second box part 5b, wherein the first box part 5a and the second box part 5b are joined together in a covering manner, and the first box part 5a and the second box part 5b together define a receiving space 5c for holding the battery cells.The second box part 5b can have a hollow structure open at one end, while the first box part 5a has a plate-like structure, with the first box part 5a covering the open side of the second box part 5b to form the box 5 with the receiving space 5c; the first box part 5a and the second box part 5b can also each be a hollow structure open at one side, with the open side of the first box part 5a covering the open side of the second box part 5b to form the box 5 with the receiving space 5c. Naturally, the first box part 5a and the second box part 5b can have different shapes, such as a cylindrical shape, a cuboid shape, or the like.

[0069] To increase the tightness of the connection between the first box part 5a and the second box part 5b, a sealing element, such as a sealant, a sealing ring, etc., can also be provided between the first box part 5a and the second box part 5b.

[0070] Assuming that the first box part 5a covers the top of the second box part 5b, the first box part 5a can also be referred to as the upper box cover and the second box part 5b as the lower box body.

[0071] Battery 2 can contain one or more battery cells. If multiple battery cells are present, they can be connected in series, parallel, or a mixed configuration. A mixed configuration means that the multiple battery cells are connected in both series and parallel configurations. The multiple battery cells can be connected directly in series, parallel, or a mixed configuration, and the resulting assembly is then housed in box 5. Alternatively, multiple battery cells can first be connected in series, parallel, or a mixed configuration to form battery modules 6 (not shown in the drawings), after which multiple battery modules 6 can again be connected in series, parallel, or a mixed configuration to form an assembly and housed in box 5.

[0072] The battery cell is the smallest unit that makes up the battery.

[0073] Fig. Figure 3 is a schematic representation of the battery module made of Fig. 2.

[0074] With reference to Fig. 3 In some embodiments, several battery cells 7 are provided, wherein the several battery cells 7 are initially connected in series, parallel or in a mixed circuit to form a battery module 6. Several battery modules 6 are further connected in series, parallel or in a mixed circuit to form a whole and are housed in the box.

[0075] Several battery cells 7 in the battery module 6 can be electrically connected to each other via a busbar component to realize a parallel, series, or mixed connection of several battery cells 7 in the battery module 6. One or more busbar components can be provided. The busbar components each electrically connect at least two battery cells to each other.

[0076] Fig. Figure 4 is a schematic representation of the structure of a battery cell according to the embodiments of the present application; Fig. Figure 5 is an exploded view of a battery cell made of Fig. 4.

[0077] As in Fig. 4 and Fig. As shown in Figure 5, in some embodiments the battery cell 7 comprises an electrode arrangement 10 and a housing 20, and the electrode arrangement 10 is contained in the housing 20.

[0078] The electrode arrangement 10 comprises a positive electrode and a negative electrode. During the charging and discharging process of the battery cell 7, active ions (e.g., lithium ions) are reversibly inserted and removed between the positive and negative electrodes. Optionally, the electrode arrangement 10 also includes a separator located between the positive and negative electrodes. This separator prevents a short circuit between the electrodes while simultaneously allowing the passage of active ions.

[0079] In some embodiments, the positive electrode can be a positive electrode plate, wherein the positive electrode plate can comprise a positive electrode current collector and a positive electrode active material layer arranged on at least one surface of the positive electrode current collector.

[0080] For example, the positive electrode current collector has two surfaces opposite each other in its thickness direction, with the positive electrode active material layer being arranged on one or both of the opposite surfaces of the positive electrode current collector.

[0081] In some embodiments, the positive electrode current collector can be a metal foil or a composite collector. For example, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, titanium, silver-treated aluminum, or stainless steel, etc., can be used as metal foils. The composite current collector can comprise a polymer material base layer and a metal layer formed on at least one surface of the polymer material base layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, silver alloy, etc.) on a polymer material base layer (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0082] As an example, the positive electrode active material layer can comprise one or more of the following positive electrode active materials: lithium phosphates with an olivine structure, lithium transition metal oxides, and their modified derivatives. However, the present application is not limited to these materials, and other conventional materials suitable for use as a positive electrode active material layer for a battery can also be used. These positive electrode active materials can be used either alone or in a combination of two or more. Examples of lithium-containing phosphates with an olivine structure include, but are not limited to, lithium iron phosphate (such as LiFePO4 (also called LFP)), lithium iron phosphate-carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate-carbon composites, lithium manganese iron phosphate, and lithium manganese iron phosphate-carbon composites.Examples of lithium transition metal oxides include lithium cobalt oxides (e.g., LiCoO2), lithium nickel oxides (e.g., LiNiO2), lithium manganese oxides (e.g., LiMnO2, LiMn2O4), lithium nickel cobalt oxides, lithium manganese cobalt oxides, lithium nickel manganese oxides, and lithium nickel cobalt manganese oxides (e.g., LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (abbreviated as NCM) 333 ), LiNi 0,5 Co 0,2 Mn 0,3 O2 (also abbreviated as NCM) 523 ), LiNi 0,5 Co 0,25 Mn 0,25 O2 (also abbreviated as NCM) 211 ), LiNi 0,6 Co 0,2 Mn 0,2 O2 (abbreviated as NCM) 622 ), LiNi 0,8 Co 0,1 Mn 0,1 O2 (also abbreviated as NCM) 811 ), Lithium nickel cobalt aluminum oxides (e.g. LiNi) 0,85 Co 0,1 Al 0,05 O2) and their modified derivatives.

[0083] In some embodiments, the positive electrode can be a foam metal. This foam metal can be, for example, foamed nickel, foamed copper, foamed aluminum, foamed alloys, or foamed carbon, etc. When foam metal is used as the positive electrode, the surface of the foam metal may be either free of a positive electrode active material layer or it may have a positive electrode active material layer. For example, lithium precursor materials, potassium metal, or sodium metal can also be embedded in or deposited within the foam metal, with the lithium precursor material being lithium metal and / or lithium-rich material.

[0084] In some embodiments, the negative electrode can be designed as a negative electrode plate, wherein the negative electrode plate can include a negative electrode current collector.

[0085] As an example, the negative electrode current collector can be designed as a metal foil, foam metal, or composite current collector. For instance, silver-coated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, nickel or titanium-coated material, or the like can be used as the metal foil. The foam metal can be, for example, foamed nickel, foamed copper, foamed aluminum, foamed alloys, or foamed carbon, etc. The composite current collector can comprise a polymer material base layer and a metal layer formed on at least one surface of the polymer material base layer. The composite current collector can be formed by creating a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, silver alloy, etc.).) are formed on a polymer material base layer (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0086] The negative electrode plate comprises a negative electrode current collector and a negative electrode active material layer arranged on at least one surface of the negative electrode current collector.

[0087] As a non-restrictive example, the negative electrode current collector has two surfaces opposite each other in its thickness direction, with the negative electrode active material layer being arranged on one or both of the opposite surfaces of the negative electrode current collector.

[0088] For example, the negative electrode active material can be a negative electrode active material known in the art for a battery cell 7. For example, the negative electrode active material can comprise at least one of the following materials: synthetic graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, a titanate, and the like. The silicon-based material can be selected from at least one of the following: elemental silicon, a silicon-oxygen compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of the following: elemental tin, a tin oxide compound, and a tin alloy.However, the present application is not limited to these materials, and other conventional materials suitable for use as negative electrode active materials in a battery may also be used. These negative electrode active materials may be used individually or in combination with one or more of them.

[0089] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0090] In some embodiments, the separator comprises a separator film. The present application is not subject to any particular restrictions regarding the type of separator film, and any known porous separator film with sufficient chemical and mechanical stability may be used.

[0091] The main material of the separator film can, for example, comprise at least one material from the group consisting of glass fiber, nonwoven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator film can be designed as a single-layer film or as a multi-layer composite film without restriction. If the separator film is a multi-layer composite film, the materials of the individual layers can be the same or different without any particular restriction. The separator can be designed as a separate component located between the positive and negative electrodes, or it can be attached to the surface of the positive and negative electrodes.

[0092] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is arranged between the positive and negative electrodes and serves both for ion transport and for insulating the positive and negative electrodes.

[0093] In some embodiments, the battery cell 7 further comprises an electrolyte that acts as an ion conductor between the positive and negative electrodes. For this application, there are no specific restrictions regarding the type of electrolyte, which can be selected as needed. The electrolyte can, for example, be liquid, gel-like, or completely solid.

[0094] The electrolyte solution comprises an electrolyte salt and a solvent.

[0095] In some embodiments, the electrolyte salt may comprise at least one of the following substances: lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bistrifluoromethanesulfonylimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium bisoxalatoborate, lithium difluorodioxalatophosphate and lithium tetrafluorooxalatophosphate.

[0096] In some embodiments, the solvent may consist of at least one of the following materials: ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. Alternatively, ether solvents may be chosen. These ether solvents may include one or more of the following: ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether, and crown ether.

[0097] A gel electrolyte can contain a polymer as the electrolyte backbone network, combined with an ionic liquid (lithium salts).

[0098] Solid electrolytes include polymeric solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0099] Examples of polymeric solid electrolytes include polyethers (polyoxyethylene), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids (lithium salts), cellulose, etc.

[0100] For example, inorganic solid electrolytes can be one or more of the following: oxide solid electrolytes (crystalline perovskite, superconducting sodium ion conductors, garnet, amorphous LiPON thin films), sulfide solid electrolytes (crystalline superconducting lithium ion conductors (lithium-germanium-phosphorus-sulfur, sulfosilicium-germanium), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes and hydride solid electrolytes.

[0101] For example, composite solid electrolytes are produced by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0102] In some embodiments, the electrode arrangement 10 is a wound structure. The positive electrode plate and the negative electrode plate are wound into a coiled structure.

[0103] In some embodiments, the electrode arrangement 10 has a stacked structure (lamellar structure).

[0104] For example, multiple positive electrode plates and multiple negative electrode plates can be provided, and the multiple positive electrode plates and the multiple negative electrode plates can be stacked alternately.

[0105] For example, multiple positive electrode plates can be provided and the negative electrode plate can be folded to form multiple stacked, folded segments, with a positive electrode plate enclosed between adjacent folded segments.

[0106] For example, the positive electrode plate and the negative electrode plate can be folded to form multiple stacked folded segments.

[0107] For example, several separators can be provided, each positioned between adjacent positive electrode plates or negative electrode plates.

[0108] For example, several separators can be provided continuously, being inserted by folding or winding between adjacent positive or negative electrode plates.

[0109] In some embodiments, the shape of the electrode arrangement 10 can be cylindrical, flat or polygonal prismatic.

[0110] In some embodiments, the electrode arrangement 10 is provided with terminals 11 that can conduct current from the electrode arrangement 10. The terminals 11 comprise a positive terminal and a negative terminal.

[0111] In some embodiments, the housing 20 comprises an end cover 22 and a housing body 21, wherein the housing body 21 is provided with an opening and the end cover 22 serves to cover the opening.

[0112] The housing body 21 is a component that is used together with the end cover 22 to form an inner cavity of the battery cell 7, the inner cavity formed being used to accommodate the electrode arrangement 10, the electrolyte and other components.

[0113] The housing body 21 and the end cap 22 can be separate components. For example, the housing body 21 can have an opening, and the end cap 22 can be closed at the opening to form an inner cavity for the battery cell 7.

[0114] The housing body 21 can have various shapes and sizes, for example, cuboid, cylindrical, or hexagonal prism. The shape of the housing body 21 can be determined according to the specific shape and size of the electrode arrangement 10. The material of the housing body 21 can be diverse. For example, the material of the housing body 21 includes, but is not limited to, copper, iron, aluminum, stainless steel, aluminum alloys, etc.

[0115] The shape of the end cap 22 can be adapted to the shape of the housing body 21. The end cap 22 can be made of the same material as the housing body 21, or the housing body 21 and the end cap 22 can be made of different materials. Optionally, the end cap 22 can be made of a material with a specific hardness and strength (e.g., copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.). This prevents the end cap 22 from deforming as easily when subjected to crushing or impacts, thus enabling the battery cell 7 to have higher structural strength and improving its safety performance.

[0116] The end cover 22 is connected to the housing body 21 by welding, gluing, snap-fit ​​connection or other means.

[0117] The housing body 21 can be open at one end or at both ends. In some examples, the housing body 21 can have an open structure on one side, and the end cap 22 serves to cover the housing body 21. In other examples, the housing body 21 can also have a structure with openings on both sides, with two end caps 22 provided, each abutting the two openings of the housing body 21.

[0118] In some embodiments, the battery cell 7 can include an electrode terminal 30. An electrical connection to the terminal tabs 11 can be established via the electrode terminal 30 in order to supply or receive electrical energy from the battery cell 7.

[0119] Fig. Figure 6 is a schematic sectional view of a battery cell according to an embodiment of the present application; Fig. Figure 7 is an enlarged representation of the area within the circle marking of Fig. 6; Fig. Figure 8 is an enlarged view of the area within the rectangle marker of Fig. 7; Fig. Figure 9 is a schematic representation of the insulating element and the protective element of a battery cell according to some embodiments of the present application; Fig. Figure 10 is an enlarged representation of the area within the circle marking of Fig. 9.

[0120] As in Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9 to Fig. As shown in Figure 10, the battery cell 7 in some embodiments comprises an electrode assembly 10, a housing 20, an electrode terminal 30, an insulating element 40, and a protective element 50. The housing 20 comprises a wall 23 having an electrode guide opening 231. The electrode assembly 10 is received in the housing 20 and includes a terminal tab 11. The electrode terminal 30 is electrically connected to the terminal tab 11. The electrode terminal 30 comprises a terminal body 31 extending through the electrode guide opening 231 and a fastening element 32 connected to the terminal body 31. The insulating element 40 is arranged around the terminal body 31; at least a portion of the insulating element 40 is positioned between the fastening element 32 and the wall 23 to electrically insulate the fastening element 32 and the wall 23.The protective element 50 is arranged around the connecting body 31 and is in contact with the insulating element 40, wherein the tensile strength of the protective element 50 is greater than the tensile strength of the insulating element 40.

[0121] The housing 20 can include one or more electrode arrangements 10.

[0122] As an example, the electrode arrangement 10 comprises a positive electrode plate and a negative electrode plate. The positive electrode plate includes a positive coating area coated with a positive active material layer and a positive uncoated area without a positive active material layer. The negative electrode plate includes a negative coating area coated with a negative active material layer and a negative uncoated area without a negative active material layer. The positive uncoated area of ​​the positive electrode plate forms the positive terminal, and the negative uncoated area of ​​the negative electrode plate forms the negative terminal. During the charging and discharging process of the battery cell 7, the positive electrode active material layer and the negative electrode active material layer react with the electrolyte.

[0123] The pole flag 11, which is electrically connected to the electrode connection 30, can be either a positive or a negative pole flag.

[0124] The terminal 11 can be directly connected to the electrode terminal 30, for example by welding, butting, or other means. Alternatively, the terminal 11 can also be indirectly connected to the electrode terminal 30 via other conductive components (such as the current collector component 80) to establish an electrical connection between the terminal 11 and the electrode terminal 30.

[0125] For example, the wall 23 can be the end cover 22 or a wall of the housing body 21.

[0126] The wall 23 can be circular, rectangular, elliptical or any other shape.

[0127] The electrode guide opening 231 extends through the wall 23, allowing the electrode connection 30 to conduct the electrical energy of the electrode arrangement 10 out of the housing 20. Optionally, the electrode guide opening 231 extends through the wall 23 along the thickness direction Z of the wall 23.

[0128] For example, the terminal body 31 can be passed through the electrode guide opening 231 to facilitate the connection of the electrode terminal 30 to the busbar located outside the battery cell 7.

[0129] For example, the projection of the terminal body 31 along the thickness direction Z is located within the projection of the electrode guide opening 231 along the thickness direction Z.

[0130] There may be one or more fastening parts 32.

[0131] In some examples, there is a single fastening element 32 arranged around the connection body 31. In other examples, several fastening elements 32 may be provided, arranged at intervals along the circumference of the connection body 31.

[0132] An insulating element 40 is arranged around the terminal body 31. For example, the insulating element 40 can be plugged onto the terminal body 31, whereby the insulating element 40 may or may not be in contact with the terminal body 31.

[0133] The insulating element 40 can be arranged either entirely between the mounting part 32 and the wall 23 or partially between the mounting part 32 and the wall 23. The insulating element 40 can be in direct contact with the mounting part 32 or separated by other elements, such as the protective element 50. The insulating element 40 can be in direct contact with the wall 23 or separated by other elements, such as the protective element 50.

[0134] The insulating element 40 is able to electrically insulate the mounting part 32 from the wall 23. Optionally, the insulating element 40 can also insulate at least part of the connection body 31 from the wall 23.

[0135] The protective element 50 is plugged onto the terminal body 31, whereby it may be in contact with the terminal body 31, but it does not have to be in contact.

[0136] The protective element 50 and the insulating element 40 are in contact with each other. They can simply be in contact with each other or be directly and firmly connected to each other.

[0137] Tensile strength reflects the breaking strength of a material. It is the ability of a material or sample to resist fracture under static tensile stress, or the maximum tensile force (tensile stress) a material can withstand without breaking.

[0138] The tensile strength of the protective element 50 can be determined using the following procedure: A test piece is cut from the protective element 50 and its cross-sectional area S is measured; the two ends of the test piece are secured in a tensile testing machine; the tensile testing machine is loaded at a constant speed, and the maximum load F at the point of tensile fracture of the test piece is recorded; the tensile strength of the protective element 50 can be determined by calculating F / S. Detailed procedures are described in the national standard GB / T 228-2002 "Metallic materials - Tensile testing at room temperature".

[0139] Similarly, the tensile strength of the insulating element 40 can also be determined using the method described above.

[0140] The tensile strength of the protective element 50 can be greater than, equal to or less than the tensile strength of the electrode connection 30.

[0141] In the thickness direction Z of the wall 23, the projection of the fastening element 32 may or may not overlap with the projection of the wall 23. For example, the fastening element 32 may be located on the inside or on the outside of the wall 23.

[0142] In the embodiments of the present application, the protective element 50 surrounds the terminal body 31 on its outer circumference. During the manufacture or use of the battery cell 7, the protective element 50 can limit the degree of deformation and the displacement range of the terminal body 31 in its own radial direction, thereby reducing the deformation of the insulating element 40 under the influence of the terminal body 31, lowering the risk of cracking in the insulating element 40, and increasing the reliability of the battery cell 7. The protective element 50 has a higher tensile strength than the insulating element 40, so that it does not easily deform or break when subjected to the force of the terminal body 31, thus reducing the risk of failure of the protective element 50 and increasing the reliability of the battery cell 7.

[0143] In some embodiments, the tensile strength of the protective element 50 is greater than the tensile strength of the electrode connection 30. The protective element 50 can enclose the connection body 31 and reduce the deformation of the connection body 31.

[0144] In some embodiments, the tensile strength of the protective element 50 is greater than or equal to 40 MPa. Optionally, the tensile strength of the protective element 50 is 40 MPa, 50 MPa, 80 MPa, 100 MPa, 150 MPa, 200 MPa, 300 MPa, 500 MPa, 600 MPa, 800 MPa or 1000 MPa.

[0145] In some embodiments, the modulus of elasticity of the protective element 50 is between 50 GPa and 500 GPa in order to reduce the deformation of the protective element 50 when the protective element 50 is compressed by the connecting body 31.

[0146] In some embodiments, the material of the protective element 50 comprises metal or ceramic. Metal and ceramic exhibit higher tensile strength, which increases the reliability of the protective element 50 and reduces the risk of cracking in the protective element 50.

[0147] In some embodiments, the material of the protective element 50 is aluminum or stainless steel. For example, the protective element 50 is an aluminum ring or a stainless steel ring.

[0148] In some embodiments, the protective element 50 consists of insulating ceramic, which improves the insulation between the electrode terminal 30 and the wall 23 and reduces the risk of a short circuit.

[0149] In some embodiments, at least part of the insulating element 40 is located between the fastening part 32 and the wall 23 in order to fix the insulating element 40 to the wall 23. For example, the fastening part 32 can press the insulating element 40 against the wall 23 to secure the insulating element 40.

[0150] In some embodiments, the insulating element 40 separates the protective element 50 from the wall 23. If the protective element 50 is made of a conductive material, the insulating element 40 can insulate and shield the wall 23 from the protective element 50. This reduces the risk of the electrode connection 30 conducting through the protective element 50 and the wall 23, and improves reliability.

[0151] In some embodiments, the housing 20 comprises an end cap 22 and a housing body 21, wherein the housing body 21 is provided with an opening and the end cap 22 serves to cover the opening. The housing body 21 includes a bottom wall 211, which is arranged opposite the end cap 22.

[0152] The wall 23 can be either the bottom wall 211 or the end cover 22.

[0153] In some embodiments, the wall 23 is the bottom wall 211. For example, either the bottom wall 211 or the electrode terminal 30 can serve as the positive outer electrode of the battery cell 7, and the other can serve as the negative outer electrode of the battery cell 7; the electrode terminal 30 is arranged on the bottom wall 211 such that the positive and negative output electrodes of the battery cell 7 can be brought out on the same side.

[0154] In some embodiments, the protective element 50 has a first through-hole 51, the insulating element 40 has a second through-hole 41, and the connecting body 31 is passed through the first through-hole 51, the second through-hole 41 and the electrode guide opening 231.

[0155] The first through-hole 51, the second through-hole 41 and the electrode guide opening 231 can be arranged coaxially or non-coaxially.

[0156] In the radial direction of the electrode guide opening 231, the protective element 50 may project inwards beyond the bore wall of the second through-bore 41 or it may not project inwards beyond the bore wall of the second through-bore 41.

[0157] In the radial direction of the electrode guide opening 231, the protective element 50 may protrude inwards beyond the bore wall of the electrode guide opening 231 or may not protrude inwards beyond the bore wall of the electrode guide opening 231.

[0158] The protective element 50 may or may not be in contact with the terminal body 31.

[0159] The provision of the first through-hole 51 and the second through-hole 41 makes it easier for the connecting body 31 to pass through the protective element 50 and the insulating element 40.

[0160] In some embodiments, a part of the protective element 50 projects inwards beyond the bore wall of the second through-bore 41 in the radial direction of the electrode guide opening 231.

[0161] The part of the protective element 50 that projects inwards beyond the bore wall of the second through-hole 41 can limit the deformation or displacement of the terminal body 31, reduce the risk of the terminal body 31 pressing directly against the bore wall of the second through-hole 41, reduce the elongation of the insulating element 40 in the radial direction of the electrode guide opening 231, lower the risk of a crack in the insulating element 40 and increase the reliability of the battery cell 7.

[0162] In some embodiments, a part of the protective element 50 projects inwards in the radial direction of the electrode guide opening 231 beyond the bore wall of the electrode guide opening 231.

[0163] The part of the protective element 50 that projects inwards beyond the bore wall of the electrode guide opening 231 can limit the deformation or displacement of the terminal body 31, thereby reducing the risk of the terminal body 31 compressing the wall 23, and to some extent reducing the short-circuit risk and increasing the reliability of the battery cell 7.

[0164] In some embodiments, the first through-hole 51, the second through-hole 41 and the electrode guide opening 231 are arranged coaxially.

[0165] A coaxial arrangement can, for example, mean that the axes of the first through-hole 51, the second through-hole 41, and the electrode guide opening 231 coincide. Optionally, the axis of the first through-hole 51, the axis of the second through-hole 41, and the axis of the electrode guide opening 231 are each parallel to the thickness direction Z.

[0166] It is understood that the term "coaxial" encompasses not only the case of absolute coaxiality, but also the case of approximate coaxiality, as it is commonly understood in engineering.

[0167] The coaxial arrangement of the first through-hole 51, the second through-hole 41 and the electrode guide opening 231 makes it easier for the connection body 31 to be guided simultaneously through the first through-hole 51, the second through-hole 41 and the electrode guide opening 231, thereby simplifying the structural requirements for the connection body 31 and reducing the assembly effort.

[0168] In some embodiments, the diameter of the electrode guide opening 231 is greater than or equal to the diameter of the second through-hole 41. Optionally, the diameter of the electrode guide opening 231 can also be larger than the diameter of the second through-hole 41.

[0169] In some embodiments, the bore diameter of the second through-hole 41 is greater than or equal to the bore diameter of the first through-hole 51; optionally, the bore diameter of the second through-hole 41 can be larger than the bore diameter of the first through-hole 51.

[0170] In some embodiments, at least part of the bore wall of the first through bore 51 abuts the outer circumference of the connecting body 31.

[0171] In the event of an external impact on the battery cell 7, this reduces the wobble of the terminal body 31 in the radial direction of the electrode guide opening 231. The direct contact of the bore wall of the first through-hole 51 with the outer circumference of the terminal body 31 effectively limits the deformation of the terminal body 31.

[0172] In some embodiments, the portion of the protective element 50 that projects beyond the bore wall of the second through-hole 41 is annular. The protective element 50 can thus confine the terminal body 31 from its entire outer circumference, further reducing the risk of the terminal body 31 pressing directly against the bore wall of the second through-hole 41, reducing the elongation of the insulating element 40 in the radial direction of the electrode guide opening 231, lowering the risk of cracking in the insulating element 40, and increasing the reliability of the battery cell 7.

[0173] In some embodiments, the fastening part 32 and the wall 23 overlap at least partially in the thickness direction Z of the wall 23; at least a part of the insulating element 40 and at least a part of the protective element 50 are arranged between the wall 23 and the fastening part 32.

[0174] The fastening part 32 and the wall 23 can clamp the insulating element 40 and the protective element 50 in the thickness direction Z, thereby increasing the stability of the insulating element 40 and the protective element 50, reducing the displacement of the insulating element 40 relative to the wall 23 and the displacement of the protective element 50 relative to the wall 23 in the event of an external impact on the battery cell 7, and increasing the reliability.

[0175] In some embodiments, the fastening part 32 is ring-shaped.

[0176] In some embodiments, the width W of the projection of the fastening part 32 onto the insulating element 40 in the thickness direction Z is at least 0.5 mm, so that the fastening part 32 can effectively press the insulating element 40 against the wall 23, thereby reducing the risk of displacement of the insulating element 40 along the electrode guide opening 231 and increasing reliability.

[0177] In some embodiments, the width W of the projection of the fastening part 32 onto the insulating element 40 in the thickness direction Z is greater than or equal to 0.5 mm to 5 mm.

[0178] For example, the projection of the fastening element 32 onto the insulating element 40 in the thickness direction Z can be annular, and W can be the ring width of the annular projection. The minimum ring width of the annular projection is at least 0.5 mm.

[0179] In some embodiments, the protective element 50 comprises a first part 52 and a second part 53 connected to the first part 52, the first part 52 is arranged overlapping with the insulating element 40 in the thickness direction Z, and the second part 53 projects inwards in the radial direction of the electrode guide opening 231 beyond the bore wall of the second through bore 41.

[0180] The fact that the first part 52 overlaps with the insulating element 40 in the thickness direction Z can mean that the projection of the first part 52 in the thickness direction Z lies within the projection of the insulating element 40 in the thickness direction Z.

[0181] The first part 52 is arranged overlapping the insulating element 40 in the thickness direction Z to allow the wall 23 and the fastening part 32 to clamp the insulating element 40 and the first part 52 simultaneously in the thickness direction Z. The second part 53 can limit the deformation or displacement of the terminal body 31, thereby reducing the risk of the terminal body 31 pressing directly against the bore wall of the second through-hole 41. This reduces the elongation of the insulating element 40 in the radial direction of the electrode guide opening 231, lowers the risk of cracking in the insulating element 40, and increases the reliability of the battery cell 7.

[0182] In some embodiments, the second part 53 can be ring-shaped. For example, the second part 53 is designed as a circular ring or a rectangular ring.

[0183] In some embodiments, the second part 53 is designed as a circular ring. Naturally, the inner and outer circles of a ring can be arranged concentrically or non-concentrically.

[0184] In some embodiments, the ring width of the second part 53 is between 0.1 mm and 0.8 mm. In the embodiments of the present application, the ring width of the second part 53 is limited to at least 0.1 mm. This allows the distance between the bore wall of the second through-hole 41 and the terminal body 31 to be increased, thus reducing the risk of the terminal body 31 pinching the insulating element 40. In the embodiments of the present application, the ring width of the second part 53 is limited to a maximum of 0.8 mm in order to reduce the diameter loss of the terminal body 31 and to improve its current-carrying capacity.

[0185] In some embodiments, the projection of the second through-hole 41 in the thickness direction Z lies within the projection of the electrode guide opening 231, so that the second part 53 protrudes inwards beyond the bore wall of the electrode guide opening 231, thereby reducing the risk of the terminal body 31 compressing the wall 23, reducing the deformation of the wall 23 and increasing the reliability of the battery cell 7.

[0186] In some embodiments, at least part of the first part 52 is located in the thickness direction Z between the fastening part 32 and the insulating element 40.

[0187] The fastening part 32 can press the insulating element 40 over the protective element 50, whereby the protective element 50 can achieve a protective effect in order to reduce the risk of the fastening part 32 damaging the insulating element 40 and to increase reliability.

[0188] In some embodiments, the protective element 50 has a first surface and a second surface that are opposite each other in the thickness direction Z. The first surface is in contact with the fastening part 32, and the second surface is in contact with the insulating element 40.

[0189] In some embodiments, the fastening part 32 is not in direct contact with the insulating element 40.

[0190] In some embodiments, the protective element 50 can be movably arranged on the insulating element 40 or be fixedly connected to the insulating element 40.

[0191] In some embodiments, the protective element 50 is movably arranged on the insulating element 40 and is pressed firmly against the insulating element 40 by the fastening element 32. The contact surfaces of the protective element 50 and the insulating element 40 are not directly connected. In this way, the protective element 50 can move relative to the insulating element 40 when subjected to a radial force along the electrode lead. This reduces the force exerted by the protective element 50 on the insulating element 40 and thus reduces the risk of cracking or failure of the insulating element 40.

[0192] In some embodiments, the protective element 50 is rigidly connected to the insulating element 40. For example, the protective element 50 and the insulating element 40 can also be rigidly connected to each other without the function of the fastening part 32.

[0193] When assembling the battery cell 7, the protective element 50 and the insulating element 40 can be delivered together, thus eliminating the positioning and assembly procedures of the protective element 50, simplifying the assembly process and reducing costs.

[0194] In some embodiments, the protective element 50 is firmly connected to the insulating element 40 by gluing, hot pressing, one-piece forming or in another way.

[0195] In some embodiments, the insulating element 40 comprises an insulating body 42 and an insulating projection 43, wherein the second through-hole 41 penetrates the insulating body 42 in the thickness direction Z, with at least a portion of the insulating body 42 being arranged between the fastening part 32 and the wall 23, and the insulating projection 43 projecting beyond the surface of the insulating body 42 facing away from the wall 23. At least a portion of the protective element 50 is arranged in the thickness direction Z between the fastening part 32 and the insulating body 42, and in the radial direction of the second through-hole 41 between the insulating projection 43 and the connecting body 31.

[0196] The insulating projection 43 can be provided singly or in multiples. In some examples, the insulating projection 43 is designed as a single projection and encloses the outer surface of the protective element 50; in other examples, there are several insulating projections 43 spaced apart circumferentially along the protective element 50.

[0197] During the installation of the protective element 50, the insulating projection 43 can position the protective element 50, thus simplifying the assembly process. During the manufacture or use of the battery cell 7, the insulating projection 43 can limit the protective element 50, thereby reducing its displacement and increasing its reliability.

[0198] In some embodiments, the bore diameter of the second through-hole 41 is D1, the diameter of the first through-hole 51 is D2, and the outer diameter of the protective element 50 is D3; the insulating projection 43 is annular and has an inner diameter D4. D1, D2, D3, and D4 satisfy the condition: D1-D2 > D4-D3.

[0199] D4-D3 relates to the displaceable offset of the protective element 50 in the radial direction, and the amount by which the protective element 50 projects radially inward beyond the bore wall of the second through-hole 41 depends on the value D1-D2. In the embodiments of the present application, D4-D3 is limited to a value smaller than D1-D2, so that even in the event of a mounting deviation of the protective element 50, it can be ensured that the protective element 50 projects to a certain extent radially inward beyond the bore wall of the second through-hole 41, thereby limiting the degree of deformation and the displacement range of the terminal body 31 in its own radial direction, reducing the risk of a crack in the insulating element 40, and increasing the reliability of the battery cell 7.

[0200] In some embodiments, the insulating projection 43 and the insulating body 42 form a first recess 44 in which the protective element 50 is received.

[0201] In some embodiments, the fastening part 32 is at least partially received in the first recess 44.

[0202] In some embodiments, the fastening part 32 and the insulating projection 43 are spaced apart in the radial direction of the electrode guide opening 231 to reduce the risk of the fastening part 32 pressing directly onto the insulating projection 43.

[0203] In some embodiments, part of the insulating body 42 extends into the electrode guide opening 231 in order to electrically insulate at least part of the bore wall of the electrode guide opening 231 from the terminal body 31.

[0204] In some embodiments, the electrode connection 30 further comprises a limiting part 33 that surrounds the connection body 31, wherein the limiting part 33 and the fastening part 32 are arranged on both sides of the wall 23 in the thickness direction Z of the wall 23.

[0205] For example, in the thickness direction Z, at least a part of the wall 23 is located between the limiting part 33 and the fastening part 32.

[0206] The limiting part 33 and the fastening part 32 can clamp the wall 23 from both sides in order to fix the electrode connection 30 to the wall 23.

[0207] In some embodiments, the limiting part 33 is ring-shaped.

[0208] In some embodiments, the battery cell 7 further comprises a sealing element 60 which is at least partially clamped between the limiting part 33 and the wall 23 to seal the electrode guide opening 231.

[0209] In some embodiments, the material of the sealing element 60 comprises rubber or plastic.

[0210] In some embodiments, the size of the limiting part 33 projecting outwards from the terminal body 31 in the radial direction of the electrode guide opening 231 is larger than the size of the fastening part 32 projecting outwards from the terminal body 31. The limiting part 33 is dimensioned larger, which allows the sealing element 60 to be compressed better and improves the sealing performance.

[0211] In some embodiments, the fastening part 32 is arranged on the outside of the wall 23.

[0212] In some embodiments, a second recess 311 is provided on the outside of the terminal body 31, and at the bottom of the second recess 311 there is a third through-hole 312 for injecting electrolyte.

[0213] In some embodiments, the battery cell 7 further comprises a sealing plate 70, at least part of which is received in the second recess 311 and serves to seal the third through-hole 312.

[0214] In some embodiments, the side wall of the second recess 311 is provided with a stepped surface, and the sealing plate 70 rests against the stepped surface and is welded to the connecting body 31.

[0215] In some embodiments, battery cell 7 is a hard-cased battery cell.

[0216] Fig. Figure 11 is a schematic representation of the structure of a battery cell according to some embodiments of the present application before the forming of the fastening part.

[0217] As in Fig. 7, Fig. 8 and Fig. As shown in Figure 11, in some embodiments the fastening part 32 is designed to be shaped by bending after the electrode connection 30 has been passed through the electrode guide opening 231.

[0218] During assembly, for example, the electrode connection 30 is first guided through the electrode guide opening 231, the second through-hole 41 and the first through-hole 51. Subsequently, a part of the electrode connection 30 is folded over to form the fastening part 32, and then the electrode connection 30 is riveted to the wall 23.

[0219] When the electrode connection 30 is bent, the material flows into the bending area, causing the outer circumference of the electrode connection 30 to expand; the protective element 50 can limit the material flow during the forming process of the fastening part 32, reduce the radial expansion of the electrode connection 30, lower the risk of pressure failure of the insulating element 40 during the forming process of the fastening part 32 and increase the reliability of the battery cell 7.

[0220] In some embodiments, the electrode connection 30 has a third recess 34 before being mounted on the wall 23, and the fastening part 32 is formed by folding over the side wall of the third recess 34. After the fastening part 32 has been formed, the remaining part of the third recess 34 forms the second recess 311.

[0221] In some embodiments, the fastening part 32 is arranged outside the wall 23. Folding the electrode connection 30 from the outside facilitates the forming of the electrode connection 30 and simplifies the process.

[0222] Fig. Figure 12 is a schematic partial sectional view of a battery cell according to further embodiments of the present application; Fig. Figure 13 is an enlarged representation of the area within the circle marking of Fig. 12; Fig. Figure 14 is a schematic representation of the insulating element and the protective element of a battery cell according to some embodiments of the present application.

[0223] With reference to Fig. 12, Fig. 13 to Fig. In some embodiments, the first part 52 is embedded inside the insulating element 40.

[0224] By embedding the first part 52 in the insulating element 40, the relative position between the insulating element 40 and the protective element 50 can be kept fixed during the assembly process of the battery cell 7, so that the protective element 50 can better limit the deformation of the electrode connection 30 during the assembly process and thus better protect the insulating element 40 and reduce the risk of a crack in the insulating element 40.

[0225] In some embodiments, the insulating element 40 is provided with a fourth recess 45, which is set back from the bore wall of the second through bore 41; the first part 52 is inserted into the fourth recess 45.

[0226] In some embodiments, the protective element 50 and the insulating element 40 are formed in one piece. This one-piece forming can increase the bond strength between the insulating element 40 and the protective element 50.

[0227] In some embodiments, the minimum distance between the protective element 50 and the fastening part 32 in the thickness direction Z is greater than the minimum distance between the protective element 50 and the wall 23. During the forming process of the fastening part 32, increased material accumulation occurs at the connection point between the fastening part 32 and the connecting body 31. The protective element 50 is located closer to the fastening part 32, which effectively limits the deformation of the connecting body 31 and reduces the risk of the connecting body 31 pinching the insulating element 40.

[0228] In some embodiments, a fourth recess 45 is provided on the insulating body 42.

[0229] Fig. Figure 15 is a partial exploded view of a battery according to further embodiments of the present application.

[0230] As in Fig. As shown in Figure 15, in some embodiments the bottom wall 211 of the housing body 21 is designed as a wall 23, wherein the fastening part 32 is arranged inside the wall 23.

[0231] For example, when mounting the electrode connection 30, the electrode connection 30 can be inserted from the outside of the wall 23 into the electrode guide opening 231 and guided through the first through-hole 51 and the second through-hole 41, whereupon an external device engages in the housing body 21 and bends the electrode connection 30 to form the fastening part 32.

[0232] Fig. Figure 16 is a schematic partial sectional view of a battery cell according to further embodiments of the present application.

[0233] As in Fig. As shown in Figure 16, in some embodiments the electrode connection 30 is attached to the wall 23 by means of the protective element 50.

[0234] In some embodiments, the electrode connection 30 is permanently attached to the protective element 50.

[0235] In some embodiments, the outer circumference of the electrode connection 30 is provided with a fifth recess 35, and the fastening part 32 is located on one side of the fifth recess 35 and serves to limit the fifth recess 35 together with the connection body 31.

[0236] Part of the protective element 50 is inserted into the fifth recess 35 to fix the protective element 50 to the electrode connection 30.

[0237] In some embodiments, the projection of the fastening part 32 in the thickness direction Z is located within the projection of the electrode guide opening 231.

[0238] In some embodiments, the projection of the fastening part 32 in the thickness direction Z lies within the projection of the second through-hole 41.

[0239] In some embodiments, the fastening part 32 is designed to be shaped by bending after the electrode connection 30 has been guided through the electrode guide opening 231 and the first through-hole 51.

[0240] During the folding and forming process of the fastening part 32, the electrode connection 30 is restricted by the limiting part, thereby reducing the risk of the electrode connection 30 pressing into the insulating element 40.

[0241] In some embodiments, at least a part of the insulating element 40 is arranged between the wall 23 and the protective element 50 in the thickness direction Z.

[0242] In some embodiments, a part of the wall 23 is arranged in the thickness direction Z between the limiting part 33 and the protective element 50 in order to attach the electrode connection 30 and the protective element 50 to the wall 23.

[0243] In some embodiments, part of the protective element 50 is arranged between the terminal body 31 and the insulating element 40 in the radial direction of the electrode guide opening 231. The protective element 50 can separate the terminal body 31 from the insulating element 40 to reduce the risk of the terminal body 31 directly pressing against and expanding the insulating element 40.

[0244] Some embodiments of the present application provide a battery comprising a battery cell according to one of the preceding embodiments.

[0245] Some embodiments of the present application provide an electrical device comprising the battery cell according to one of the preceding embodiments or the battery according to one of the preceding embodiments, wherein the battery cell is used to provide electrical energy. The electrical device may be one of the aforementioned devices or systems that use a battery cell.

[0246] As in Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9 to Fig. As shown in Figure 10, the embodiments of the present application provide a battery cell 7 comprising an electrode arrangement 10, a housing 20, an electrode connection 30, an insulating element 40 and a protective element 50.

[0247] The housing 20 comprises a housing body 21 and an end cover 22, the housing body 21 having an opening and the end cover 22 serving to cover the opening. The housing 20 includes a bottom wall 211, which is opposite the end cover 22. The bottom wall 211 is provided with an electrode guide opening 231.

[0248] The electrode arrangement 10 is received in the housing 20, wherein a pole flag 11 is provided at the end of the electrode arrangement 10 facing the bottom wall 211.

[0249] The protective element 50 has a first through-hole 51, and the insulating element 40 has a second through-hole 41. The electrode connection 30 consists of a connection body 31, a fastening part 32, and a limiting part 33. The connection body 31 extends through the first through-hole 51, the second through-hole 41, and the electrode guide opening 231. The limiting part 33 is located inside the base wall 211 and surrounds the connection body 31. The fastening part 32 is located outside the base wall 211 and surrounds the connection body 31.

[0250] The insulating element 40 comprises an insulating body 42 and an insulating projection 43, wherein the second through-hole 41 penetrates the insulating body 42 along the thickness direction Z of the bottom wall 211; at least a part of the insulating body 42 is arranged between the fastening part 32 and the bottom wall 211, and the insulating projection 43 protrudes beyond the surface of the insulating body 42 that faces away from the bottom wall 211.

[0251] The protective element 50 comprises a first part 52 and a second part 53. The projection of the first part 52 in the thickness direction Z lies within the projection of the insulating body 42 in the thickness direction Z, and the first part 52 is embedded between the insulating body 42 and the mounting part 32. The second part 53 is connected to the first part 52 and projects inwards in the radial direction of the electrode guide opening 231 beyond the bore wall of the second through-bore 41. The second part 53 delimits the first through-bore 51.

[0252] The tensile strength of the protective element 50 is greater than the tensile strength of the insulating element 40. The fastening part 32 is designed to be bent after the electrode connection 30 has been passed through the electrode guide opening 231.

[0253] It should also be noted that the embodiments of the present application and the features contained therein can be combined with one another, provided there is no contradiction.

[0254] Finally, it should be noted that the foregoing embodiments serve only to illustrate the technical solution of the present application and do not constitute a limitation. Although the present application has been described in detail with reference to the foregoing embodiments, the person skilled in the art will recognize that modifications to the technical solutions described in the foregoing embodiments or equivalent substitutions of individual technical features are possible without abandoning the essential concept and without exceeding the scope of protection of the technical solutions of the embodiments of the present application. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited non-patent literature

[0000] Standard GB / T 228-2002

[0138]

Claims

A battery cell comprising: a housing comprising a wall, the wall having an electrode guide opening; an electrode assembly received in the housing, the electrode assembly comprising a terminal tab; an electrode terminal electrically connected to the terminal tab, the electrode terminal comprising a terminal body extending through the electrode guide opening and a fastening part connected to the terminal body; an insulating element arranged around the terminal body, with at least a portion of the insulating element being arranged between the fastening part and the wall to electrically insulate the fastening part and the wall; a protective element arranged around the terminal body and in contact with the insulating element, the tensile strength of the protective element being greater than the tensile strength of the insulating element. Battery cell according to claim 1, wherein the tensile strength of the protective element is greater than the tensile strength of the electrode connection. Battery cell according to claim 1 or 2, wherein the material of the protective element comprises metal or ceramic. Battery cell according to one of claims 1 to 3, wherein the protective element has a first through-hole, wherein the insulating element has a second through-hole, wherein the connecting body is passed through the first through-hole, the second through-hole and the electrode guide opening. Battery cell according to claim 4, wherein along the radial direction of the electrode guide opening a part of the protective element projects inwards beyond the bore wall of the second through-bore and / or projects beyond the bore wall of the electrode guide opening. Battery cell according to claim 4, wherein the first through-hole, the second through-hole and the electrode guide opening are arranged coaxially. Battery cell according to claim 4, wherein at least a part of the bore wall of the first through bore abuts the outer circumference of the terminal body. Battery cell according to claim 5, wherein the part of the protective element projecting beyond the bore wall of the second through-bore is ring-shaped. Battery cell according to one of claims 4 to 8, wherein in the thickness direction of the wall the fastening part overlaps at least partially with the wall, wherein at least a part of the insulating element and at least a part of the protective element are arranged between the wall and the fastening part. Battery cell according to claim 9, wherein the width of the projection of the fastening part onto the insulating element in the thickness direction is greater than or equal to 0.5 mm. Battery cell according to claim 9 or 10, wherein the protective element comprises a first part and a second part connected to the first part, wherein the first part is arranged overlapping with the insulating element in the thickness direction, and wherein the second part projects inwards in the radial direction of the electrode guide opening beyond the bore wall of the second through-bore. Battery cell according to claim 11, wherein in the thickness direction the projection of the second through-hole lies within the projection of the electrode guide opening. Battery cell according to claim 11 or 12, wherein the first part is embedded in the interior of the insulating element. Battery cell according to claim 11 or 12, wherein at least a part of the first part is arranged between the fastening part and the insulating element in the thickness direction. Battery cell according to claim 9, wherein the insulating element comprises an insulating body and an insulating projection, wherein the second through-hole is passed through the insulating body in the thickness direction, wherein at least a part of the insulating body is arranged between the fastening part and the wall, wherein the insulating projection protrudes beyond a surface of the insulating body facing away from the wall; wherein at least a part of the protective element is arranged between the fastening part and the insulating body in the thickness direction and between the insulating projection and the terminal body in the radial direction of the second through-hole. Battery cell according to claim 15, wherein the second through-hole has an opening diameter D1, the first through-hole has a diameter D2, and the protective element has an outer diameter D3, wherein the insulating projection is annular and has an inner diameter D4, wherein D1, D2, D3 and D4 satisfy the condition: D1-D2 > D4-D3. Battery cell according to one of claims 1 to 16, wherein the electrode connection further comprises a limiting part surrounding the connection body, wherein in the thickness direction of the wall the limiting part and the fastening part are arranged on opposite sides of the wall. Battery cell according to one of claims 1 to 17, wherein the fastening part is arranged on the inside of the wall; or wherein the fastening part is arranged on the outside of the wall. Battery cell according to one of claims 1 to 18, wherein the fastening part is designed to be formed by deformation after the electrode connection has been passed through the electrode guide opening. Battery cell according to one of claims 1 to 19, wherein the protective element is firmly connected to the insulating element. Battery cell according to claim 20, wherein the protective element is formed integrally with the insulating element. Battery cell according to one of claims 1 to 21, wherein the housing comprises a housing body and an end cover, wherein the housing body has an opening and the end cover covers the opening; wherein the housing body comprises a bottom wall opposite the end cover, wherein the wall forms the bottom wall. Battery comprising multiple battery cells according to any one of claims 1 to 22. Electrical device comprising the battery according to claim 23, wherein the battery serves to provide electrical energy.

Images