Battery cell and battery pack

Abstract

The application provides a battery monomer and a battery pack, and relates to the technical field of batteries. The battery monomer comprises a shell, an electrode assembly arranged in the shell, an end cover connected with the shell, a pole connected with the electrode assembly and arranged on the end cover, a reinforcing structure comprising a plastic part and a metal part, and a waterproof and breathable layer connected with the plastic part. The end cover is provided with a first through hole, the metal part is provided with a second through hole in communication with the first through hole, the plastic part is connected with the metal part in a surrounding manner, and the waterproof and breathable layer completely covers the first through hole and the second through hole respectively. The battery monomer provided by the application improves the situation that the heat generated in the shell is conducted to the waterproof and breathable layer through the end cover, reduces the possibility that the waterproof and breathable layer is pulled and deformed by the end cover, and thus the reliability of the waterproof and breathable layer is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell and a battery pack. Background Technology

[0002] The information disclosed in this background section is intended only to enhance the understanding of the general background of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art.

[0003] To mitigate the expansion and deformation of individual battery cells, they are typically equipped with a waterproof and breathable layer to release gases generated during charging and discharging. However, the heat generated during charging and discharging can easily be conducted to the waterproof and breathable layer through the end cap, and deformation of the end cap can easily tear the waterproof and breathable layer, causing it to rupture, thus affecting the reliability of the waterproof and breathable layer. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a battery cell and a battery pack, which aims to solve the technical problem of how to improve the reliability of the waterproof and breathable layer.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: In a first aspect, embodiments of this application provide a battery cell having a first direction. The battery cell includes: a housing; an electrode assembly disposed within the housing; an end cap connected to the housing, the end cap having a first through hole; an electrode post disposed on the end cap and electrically connected to the electrode assembly; a reinforcing structure including a plastic portion and a metal portion interconnected, the plastic portion being connected to the end cap and surrounding the metal portion, the metal portion having a second through hole communicating with the first through hole; and a waterproof and breathable layer connected to the plastic portion, wherein along the first direction, the waterproof and breathable layer completely covers the first through hole and the second through hole, respectively.

[0006] In some embodiments of the first aspect, one side of the plastic portion is provided with a first clearance groove communicating with the second through hole, and at least a portion of the waterproof and breathable layer is located within the first clearance groove.

[0007] In some embodiments of the first aspect, the battery cell further includes a positioning protrusion, the first clearance groove has a first groove bottom connected to the positioning protrusion, the waterproof and breathable layer is provided with a positioning hole, and the positioning protrusion passes through the positioning hole.

[0008] In some embodiments of the first aspect, multiple positioning protrusions and multiple positioning holes are provided, and the multiple positioning protrusions and multiple positioning holes are distributed at intervals along the circumference of the metal part, and the multiple positioning protrusions and multiple positioning holes are arranged in a one-to-one correspondence.

[0009] In some embodiments of the first aspect, the side of the plastic part having the first clearance groove is a first surface, the side of the waterproof and breathable layer away from the bottom of the first groove is a second surface, the side of the positioning protrusion away from the bottom of the first groove is a third surface, the second surface is flush with the first surface, and the third surface is flush with the second surface.

[0010] In some embodiments of the first aspect, the end cap has a second clearance groove communicating with the first through hole on the side away from the electrode assembly, the metal part and the waterproof and breathable layer are both located in the second clearance groove, at least a portion of the plastic part is located in the second clearance groove, the second clearance groove has a second groove bottom, and the waterproof and breathable layer is located between the metal part and the second groove bottom.

[0011] In some embodiments of the first aspect, the side of the end cap with the second clearance groove is a fourth surface, and the side of the plastic part away from the bottom of the second groove is a fifth surface, and the fifth surface is flush with the fourth surface.

[0012] In some embodiments of the first aspect, the plastic portion is located on the side of the end cap away from the electrode assembly, the waterproof and breathable layer is located on the side of the plastic portion away from the end cap, and the metal portion is located between the waterproof and breathable layer and the end cap.

[0013] In some embodiments of the first aspect, the second through hole includes a plurality of vent holes arranged in a rectangular array, and at least a portion of the plurality of vent holes communicate with the first through hole.

[0014] In some embodiments of the first aspect, the battery cell has a second direction and a third direction that are mutually perpendicular to the first direction. The metal part includes a plurality of first metal wires and a plurality of second metal wires. The plurality of first metal wires are spaced apart along the second direction and are all connected to the plastic part. The plurality of second metal wires are spaced apart along the third direction and are all connected to the plastic part. The plurality of first metal wires and the plurality of second metal wires are intersected to form a plurality of vent holes.

[0015] Secondly, embodiments of this application provide a battery pack including the battery cells described in any of the embodiments of the first aspect above.

[0016] The beneficial effects of this application are as follows: The battery cell provided in this application includes a reinforcing structure comprising an interconnected plastic portion and a metal portion. The plastic portion is connected to an end cap and surrounds the metal portion. The metal portion has a second through-hole communicating with a first through-hole in the end cap. A waterproof and breathable layer is connected to the plastic portion and completely covers both the first and second through-holes. Thus, during charging and discharging, gas generated inside the battery cell can be discharged to the outside of the battery cell through the waterproof and breathable layer, the first through-hole, and the second through-hole, improving the situation of expansion and deformation of the battery cell.

[0017] Meanwhile, since the plastic part has lower thermal conductivity than the metal part, the setting of the plastic part can reduce the thermal conductivity of the reinforcing structure, and improve the situation where the heat generated in the shell is conducted to the waterproof and breathable layer through the end cap. The setting of the metal part increases the strength of the reinforcing structure and reduces the possibility of the waterproof and breathable layer being stretched by the deformation of the end cap, thereby improving the reliability of the waterproof and breathable layer.

[0018] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A three-dimensional structural schematic diagram of a battery cell is shown in some embodiments of this application; Figure 2 It shows Figure 1 A schematic diagram of the three-dimensional sectional structure at point AA; Figure 3 It shows Figure 2 A magnified structural diagram of region B in the middle; Figure 4 It shows Figure 1 A one-view exploded structural diagram showing the concealed housing, electrode assembly, and conductive components. Figure 5 It shows Figure 1 Another exploded view of the structure after concealing the housing, electrode assembly, and conductive components; Figure 6 It shows Figure 5 A schematic diagram of the assembly structure of the central reinforcing structure and the waterproof and breathable layer from one perspective; Figure 7 It shows Figure 5Another perspective on the assembly structure of the reinforced structure and the waterproof and breathable layer; Figure 8 This application shows a three-dimensional structural diagram of a battery cell after concealing the housing, electrode assembly, and conductive components in other embodiments. Figure 9 It shows Figure 8 A three-dimensional sectional view of the structure at point CC; Figure 10 It shows Figure 9 A magnified structural diagram of region D in the middle; Figure 11 It shows Figure 10 A schematic diagram of the assembly structure of the central reinforcing structure and the waterproof and breathable layer from one perspective; Figure 12 It shows Figure 10 Another perspective on the assembly structure of the reinforced structure and the waterproof and breathable layer.

[0021] Explanation of key component symbols: 100 - Battery cell; 110 - Housing; 120 - Electrode assembly; 130 - End cap; 131 - First through hole; 132 - Second clearance groove; 1321 - Second groove bottom; 133 - Fourth surface; 140 - Terminal post; 150 - Reinforcing structure; 151 - Plastic part; 1511 - First surface; 1512 - Fifth surface; 152 - Metal part; 1521 - First metal wire; 1522 - Second metal wire; 153 - Second through hole; 1531 - Vent hole; 154 - First clearance groove; 1541 - First groove bottom; 155 - Positioning protrusion; 1551 - Third surface; 160 - Waterproof and breathable layer; 161 - Positioning hole; 162 - Second surface; 170 - Conductive component; X - Second direction; Y - Third direction; Z - First direction. Detailed Implementation

[0022] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0023] In the description of this application, the terms "center", "longitudinal", "lateral", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0024] Furthermore, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Moreover, "above" or "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below" or "below" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0025] In the description of this application, the terms "first," "second," etc., are used to distinguish different objects and should not be construed as indicating or implying a specific order or primary / secondary relationship, or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0026] In the description of this application, the term "multiple" means two or more, unless otherwise explicitly specified. The term "multiple A's correspond to multiple B's in a one-to-one manner" can be understood as: the number of A's and the number of B's ​​are the same, and there is a one-to-one mapping relationship, that is, each A corresponds to only one B, and each B corresponds to only one A.

[0027] In the description of this application, unless otherwise explicitly specified, the terms "installation," "connection," "attachment," etc., should be interpreted broadly. For example, they can refer to non-detachable connections (e.g., welding, riveting, etc.), detachable connections (e.g., snap-fit, screw connections, plug-in connections, etc.), or integral structures; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0028] In the description of this application, the term "and / or" can be understood to mean three possibilities. For example, A and / or B can represent: A alone; A and B simultaneously; or B alone. Additionally, the character " / " generally indicates that the preceding and following objects have an "or" relationship.

[0029] In the description of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. For example, if the angle between two directions is 80° to 90°, the two directions can be considered perpendicular; if the angle between two directions is 0° to 10°, the two directions can be considered parallel.

[0030] To mitigate the expansion and deformation of individual battery cells, they are typically equipped with a waterproof and breathable layer. This layer is a thin film that prevents liquid penetration while allowing gas to pass through, and it is used to expel gases generated during charging and discharging. However, the heat generated inside the battery cell during charging and discharging can easily be conducted to the waterproof and breathable layer through the end cap, and deformation of the end cap can easily pull on the waterproof and breathable layer, causing it to rupture, thus affecting the reliability of the waterproof and breathable layer.

[0031] like Figure 1 As shown, to solve the above-mentioned technical problems, embodiments of this application provide a battery cell 100, which relates to the field of battery technology and is mainly used in battery packs, so as to be indirectly used in electrical devices or energy storage devices in the form of battery packs. Of course, the battery cell 100 can also be directly used in electrical devices or energy storage devices without taking the form of a battery pack, and no specific limitation is made to the application scenarios of the battery cell 100 here.

[0032] For example, electrical devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be gasoline-powered cars, natural gas-powered cars, new energy vehicles, etc., and new energy vehicles can be pure electric vehicles, hybrid electric vehicles, range-extended electric vehicles, etc.; spacecraft can be airplanes, rockets, space shuttles, drones, spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; power tools can be metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers; energy storage devices include energy storage containers, energy storage cabinets, energy storage power stations, wind power generation devices, solar power generation devices, mobile power devices, temporary power supply devices, etc.; no specific limitations are made on the types of electrical devices and energy storage devices here.

[0033] like Figures 1 to 3 As shown, the battery cell 100 provided in this embodiment has a first direction Z, and the battery cell 100 includes: a housing 110, an electrode assembly 120, an end cap 130, a terminal post 140, a reinforcing structure 150, and a waterproof and breathable layer 160.

[0034] The electrode assembly 120 is disposed within the housing 110; the end cap 130 is connected to the housing 110 and has a first through hole 131; the electrode post 140 is disposed on the end cap 130 and is electrically connected to the electrode assembly 120; the reinforcing structure 150 includes a plastic part 151 and a metal part 152 connected to each other, the plastic part 151 is connected to the end cap 130 and surrounds the metal part 152, the metal part 152 has a second through hole 153 communicating with the first through hole 131; the waterproof and breathable layer 160 is connected to the plastic part 151, and along the first direction Z, the waterproof and breathable layer 160 completely covers the first through hole 131 and the second through hole 153 respectively.

[0035] For example, the material of the plastic part 151 can be polyethylene, polyvinyl chloride, polypropylene, polytetrafluoroethylene, epoxy resin, etc., and no specific limitation is made here; the material of the metal part 152 can be aluminum, copper, steel, etc., and no specific limitation is made here.

[0036] It is understood that in the battery cell 100 provided in this embodiment, the reinforcing structure 150 includes a plastic part 151 and a metal part 152 connected to each other. The plastic part 151 is connected to the end cap 130 and surrounds the metal part 152. The metal part 152 is provided with a second through hole 153 communicating with the first through hole 131 of the end cap 130. The waterproof and breathable layer 160 is connected to the plastic part 151 and completely covers the first through hole 131 and the second through hole 153 respectively. In this way, during the charging and discharging process of the battery cell 100, the gas generated inside the casing 110 can be discharged to the outside of the battery cell 100 through the waterproof and breathable layer 160, the first through hole 131, and the second through hole 153, thereby improving the situation of expansion and deformation of the battery cell 100.

[0037] Meanwhile, since the plastic part 151 has lower thermal conductivity than the metal part 152, the presence of the plastic part 151 can reduce the thermal conductivity of the reinforcing structure 150, thus improving the conduction of heat generated inside the housing 110 to the waterproof and breathable layer 160 via the end cap 130. The presence of the metal part 152 increases the strength of the reinforcing structure 150, reducing the possibility of the waterproof and breathable layer 160 being stretched by the deformation of the end cap 130, thereby improving the reliability of the waterproof and breathable layer 160.

[0038] like Figure 3As shown, the waterproof and breathable layer 160 can be located on the side of the plastic part 151 near the end cap 130, thereby completely covering the first through hole 131 and the second through hole 153 on this side. Based on this, the gas generated inside the housing 110 can be discharged to the outside of the battery cell 100 in sequence through the first through hole 131, the waterproof and breathable layer 160 and the second through hole 153.

[0039] Of course, such as Figure 10 As shown, the waterproof and breathable layer 160 can also be located on the side of the plastic part 151 away from the end cap 130, thereby completely covering the first through hole 131 and the second through hole 153 on that side. Based on this, the gas generated inside the housing 110 can be discharged to the outside of the battery cell 100 in sequence through the first through hole 131, the second through hole 153 and the waterproof and breathable layer 160. Here, the specific position of the waterproof and breathable layer 160 when it completely covers the first through hole 131 and the second through hole 153 is not specified.

[0040] like Figure 4 and Figure 5 As shown, in some embodiments, a first clearance groove 154 communicating with the second through hole 153 is provided on one side of the plastic part 151, and at least a portion of the waterproof and breathable layer 160 is located in the first clearance groove 154.

[0041] Understandably, by accommodating at least a portion of the waterproof and breathable layer 160 through the first clearance groove 154, not only can the space occupied by the waterproof and breathable layer 160 be reduced, thereby helping to improve the energy density of the battery cell 100, but the waterproof and breathable layer 160 can also be limited, thereby helping to enhance the stability of the waterproof and breathable layer 160; in addition, it can also play a positioning role during the installation of the waterproof and breathable layer 160.

[0042] It should be noted that, as Figure 3 As shown, when the waterproof and breathable layer 160 is located on the side of the plastic portion 151 near the end cap 130, the first clearance groove 154 can be located on the side of the plastic portion 151 near the end cap 130; as Figure 10 As shown, when the waterproof and breathable layer 160 is located on the side of the plastic part 151 away from the end cap 130, the first clearance groove 154 can be located on the side of the plastic part 151 away from the end cap 130. The position of the first clearance groove 154 is not specifically limited here.

[0043] like Figure 1 , Figure 5 and Figure 6 As shown, the battery cell 100 further includes a positioning protrusion 155, the first clearance groove 154 has a first groove bottom 1541, the first groove bottom 1541 is connected to the positioning protrusion 155, and the waterproof and breathable layer 160 is provided with a positioning hole 161, through which the positioning protrusion 155 passes.

[0044] Understandably, when installing the waterproof and breathable layer 160, aligning the positioning hole 161 of the waterproof and breathable layer 160 with the positioning protrusion 155 further ensures accurate installation and positioning, thereby reducing the difficulty of installing the waterproof and breathable layer 160. Furthermore, the positioning protrusion 155, passing through the positioning hole 161, also restricts the movement of the waterproof and breathable layer 160 relative to the plastic part 151, thus further enhancing the stability of the waterproof and breathable layer 160.

[0045] like Figure 5 and Figure 6 As shown, furthermore, multiple positioning protrusions 155 and multiple positioning holes 161 are provided. The multiple positioning protrusions 155 and multiple positioning holes 161 are distributed at intervals along the circumference of the metal part 152, and the multiple positioning protrusions 155 and multiple positioning holes 161 are set one-to-one. In this way, positioning and limiting effects can be achieved at multiple positions, thereby further facilitating the installation of the waterproof and breathable layer 160 and further enhancing the stability of the waterproof and breathable layer 160.

[0046] like Figure 5 and Figure 6 As shown, further, the side of the plastic part 151 with the first relief groove 154 is the first surface 1511, the side of the waterproof and breathable layer 160 away from the bottom of the first groove 1541 is the second surface 162, and the side of the positioning protrusion 155 away from the bottom of the first groove 1541 is the third surface 1551. The second surface 162 is flush with the first surface 1511, and the third surface 1551 is flush with the second surface 162. This allows the entire waterproof and breathable layer 160 to be located within the first relief groove 154 without any redundant space, thereby helping to further reduce the space occupied by the waterproof and breathable layer 160 and increase the flatness of the appearance.

[0047] Furthermore, when the first clearance groove 154 and the waterproof and breathable layer 160 are both located on the side of the plastic part 151 near the end cap 130, the first surface 1511, the second surface 162 and the third surface 1551 can simultaneously adhere to the side of the end cap 130 away from the electrode assembly 120, thereby helping to further enhance the stability of the waterproof and breathable layer 160.

[0048] like Figure 2 refer to Figure 4As shown, in some embodiments, the end cap 130 has a second clearance groove 132 communicating with the first through hole 131 on the side away from the electrode assembly 120. The metal part 152 and the waterproof and breathable layer 160 are both located in the second clearance groove 132, and at least a portion of the plastic part 151 is located in the second clearance groove 132. The second clearance groove 132 has a second groove bottom 1321, and the waterproof and breathable layer 160 is located between the metal part 152 and the second groove bottom 1321. In this way, the waterproof and breathable layer 160 is jointly limited by the plastic part 151 and the end cap 130, which enhances the stability of the waterproof and breathable layer 160.

[0049] Furthermore, by accommodating at least a portion of the metal part 152, the waterproof and breathable layer 160, and the plastic part 151 through the second clearance groove 132, the space occupied by the reinforcing structure 150 can be effectively reduced, making the structure at the end cap 130 position more compact, thereby helping to improve the energy density of the battery cell 100.

[0050] like Figures 2 to 4 As shown, further, the side of the end cap 130 with the second clearance groove 132 is the fourth surface 133, and the side of the plastic part 151 away from the bottom 1321 of the second groove is the fifth surface 1512. The fifth surface 1512 is flush with the fourth surface 133. In this way, the entire plastic part 151 is located within the second clearance groove 132, and there is no redundant space, which helps to further reduce the space occupied by the reinforcing structure 150 and increase the flatness of the appearance.

[0051] like Figure 1 , Figure 2 and Figure 8 As shown, in some other embodiments, the plastic portion 151 is located on the side of the end cap 130 away from the electrode assembly 120, the waterproof and breathable layer 160 is located on the side of the plastic portion 151 away from the end cap 130, and the metal portion 152 is located between the waterproof and breathable layer 160 and the end cap 130. In this way, during the charging and discharging process of the battery cell 100, the gas generated inside the casing 110 can be discharged to the outside of the battery cell 100 sequentially through the first through hole 131, the second through hole 153, and the waterproof and breathable layer 160, which can also improve the situation where the battery cell 100 expands and deforms.

[0052] For example, the waterproof and breathable layer 160 can be connected to the side of the plastic part 151 away from the end cap 130 by means of adhesive bonding, hot melt bonding, snap-fit, etc., without specific limitations.

[0053] like Figures 9 to 12 As shown, in some embodiments, the second through hole 153 includes a plurality of vent holes 1531, which are arranged in a rectangular array, and at least some of the vent holes 1531 are connected to the first through hole 131.

[0054] It is understandable that by dividing the second through hole 153 into a plurality of vent holes 1531 arranged in a rectangular array, it is possible to discharge the gas generated inside the housing 110, and also to prevent the passage of external or internal solid substances.

[0055] It should be noted that when the second through hole 153 includes multiple vent holes 1531, "the waterproof and breathable layer 160 completely covers the second through hole 153" can be understood as the waterproof and breathable layer 160 completely covering multiple vent holes 1531, that is, each vent hole 1531 is completely covered by the waterproof and breathable layer 160.

[0056] like Figure 1 , Figure 4 and Figure 7 As shown, the battery cell 100 further includes a second direction X and a third direction Y that are mutually perpendicular to the first direction Z. The metal part 152 includes a plurality of first metal wires 1521 and a plurality of second metal wires 1522. The plurality of first metal wires 1521 are spaced apart along the second direction X and are all connected to the plastic part 151. The plurality of second metal wires 1522 are spaced apart along the third direction Y and are all connected to the plastic part 151. The plurality of first metal wires 1521 and the plurality of second metal wires 1522 are intersected to form a plurality of vent holes 1531.

[0057] It should be noted that multiple first metal wires 1521 and multiple second metal wires 1522 intersecting and interconnecting can form multiple vent holes 1531 arranged in a rectangular array; of course, multiple first metal wires 1521 and multiple second metal wires 1522 intersecting but not interconnecting can also form multiple vent holes 1531 arranged in a rectangular array, and no specific limitation is made here.

[0058] It should be noted that in the battery cell 100 provided in this embodiment, the material of the end cap 130 and / or the material of the casing 110 can be aluminum, aluminum alloy, copper, iron, stainless steel, plastic, etc., and no specific limitation is made here; the terminal post 140 can be directly electrically connected to the electrode assembly 120, or it can be indirectly electrically connected to the electrode assembly 120 through a conductive element (the conductive element 170 is located inside the casing 110 and is electrically connected to the terminal post 140 and the electrode assembly 120 respectively). The material of the conductive element 170 and / or the terminal post 140 can be a metallic conductive material (e.g., copper, aluminum, silver, gold, iron, nickel, etc.) or a non-metallic conductive material (e.g., carbon-based materials, superconductors, semiconductors, etc.), and no specific limitation is made here; It should be noted that the battery cell 100 provided in this embodiment mainly relies on the movement of metal ions between the positive and negative electrode plates to operate. The battery cell 100 can be cuboid, cylindrical, flat, or other shapes; according to the packaging method, the battery cell 100 can be a square battery, cylindrical battery, pouch battery, etc.; according to the type of metal ions, the battery cell 100 can be a lithium-ion battery, sodium-ion battery, etc., and no specific limitation is made on the type of battery cell 100 here.

[0059] Furthermore, according to the classification of the physical state of the electrolyte, the battery cell 100 provided in this embodiment can be a liquid battery, that is, it uses a liquid electrolyte. Exemplarily, the electrode post 140 may include a positive electrode post and a negative electrode post. The electrode assembly 120 may be manufactured using a winding process or a stacking process. The electrode assembly 120 may include an electrode body and electrode tabs, the electrode tabs including a positive electrode tab and a negative electrode tab. The electrode body is immersed in the liquid electrolyte and includes a positive electrode sheet, a negative electrode sheet, and a separator layer. The separator layer is disposed between the positive electrode sheet and the negative electrode sheet. The material of the separator layer can be polypropylene, polyethylene, etc. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive electrode tab is connected to the positive current collector and to the positive electrode post. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The negative electrode tab is connected to the negative current collector and to the negative electrode post. Taking lithium ions as an example, the materials for the positive electrode current collector and the positive electrode tab can be aluminum, and the materials for the positive electrode active material layer can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, lithium manganese oxide, etc.; the materials for the negative electrode current collector and the negative electrode tab can be copper, and the negative electrode active material can be graphite, silicon, etc.

[0060] Of course, the battery cell 100 provided in this embodiment can also be a solid-state battery, that is, a solid electrolyte, such as sulfide, oxide or polymer electrolyte. Solid electrolyte can replace the separator and liquid electrolyte, and has both ion conduction and isolation functions. The type of battery cell 100 is not specifically limited here.

[0061] To address the aforementioned technical problems, embodiments of this application also provide a battery pack, including the battery cell 100 from any of the above embodiments.

[0062] It is understood that since the battery pack provided in this embodiment has the battery cell 100 in any of the above embodiments, it has all the beneficial effects of the battery cell 100, which will not be described in detail here.

[0063] In the description of this application, the terms "some embodiments," "one embodiment," "example," "specific example," "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In the description of this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0064] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A battery cell, characterized by, Having a first orientation (Z), the battery cell includes: Casing (110); An electrode assembly (120) is disposed within the housing (110); An end cap (130) is connected to the housing (110), and the end cap (130) is provided with a first through hole (131). An electrode post (140) is disposed on the end cap (130) and electrically connected to the electrode assembly (120); The reinforcing structure (150) includes a plastic part (151) and a metal part (152) connected to each other. The plastic part (151) is connected to the end cap (130) and is disposed around the metal part (152). The metal part (152) is provided with a second through hole (153) communicating with the first through hole (131). A waterproof and breathable layer (160) is connected to the plastic part (151). Along the first direction (Z), the waterproof and breathable layer (160) completely covers the first through hole (131) and the second through hole (153).

2. The battery cell of claim 1, wherein, The plastic part (151) has a first clearance groove (154) on one side that communicates with the second through hole (153), and at least a portion of the waterproof and breathable layer (160) is located in the first clearance groove (154).

3. The battery cell of claim 2, wherein, The battery cell also includes a positioning protrusion (155), the first clearance groove (154) has a first groove bottom (1541), the first groove bottom (1541) is connected to the positioning protrusion (155), the waterproof and breathable layer (160) is provided with a positioning hole (161), and the positioning protrusion (155) passes through the positioning hole (161).

4. The battery cell according to claim 3, characterized in that, The positioning protrusions (155) and the positioning holes (161) are provided in multiples. The multiple positioning protrusions (155) and the multiple positioning holes (161) are distributed at intervals along the circumference of the metal part (152), and the multiple positioning protrusions (155) and the multiple positioning holes (161) are arranged in a one-to-one correspondence.

5. The battery cell of claim 3, wherein, The plastic part (151) has a first surface (1511) on one side where the first clearance groove (154) is provided, the waterproof and breathable layer (160) has a second surface (162) on one side away from the bottom of the first groove (1541), and the positioning protrusion (155) has a third surface (1551) on one side away from the bottom of the first groove (1541). The second surface (162) is flush with the first surface (1511), and the third surface (1551) is flush with the second surface (162).

6. The battery cell according to any one of claims 1 to 5, characterized in that, The end cap (130) has a second clearance groove (132) communicating with the first through hole (131) on the side away from the electrode assembly (120). The metal part (152) and the waterproof and breathable layer (160) are both located in the second clearance groove (132). At least a portion of the plastic part (151) is located in the second clearance groove (132). The second clearance groove (132) has a second groove bottom (1321). The waterproof and breathable layer (160) is located between the metal part (152) and the second groove bottom (1321).

7. The battery cell according to claim 6, characterized in that, The end cap (130) has a fourth surface (133) on one side where the second clearance groove (132) is provided, and the plastic part (151) has a fifth surface (1512) on one side away from the bottom of the second groove (1321). The fifth surface (1512) is flush with the fourth surface (133).

8. The battery cell according to any one of claims 1 to 5, characterized in that, The plastic part (151) is located on the side of the end cap (130) away from the electrode assembly (120), the waterproof and breathable layer (160) is located on the side of the plastic part (151) away from the end cap (130), and the metal part (152) is located between the waterproof and breathable layer (160) and the end cap (130).

9. The battery cell according to any one of claims 1 to 5, characterized in that, The second through hole (153) includes a plurality of vent holes (1531), which are arranged in a rectangular array, and at least a portion of the vent holes (1531) are connected to the first through hole (131).

10. The battery cell of claim 9, wherein, The battery cell has a second direction (X) and a third direction (Y) that are mutually perpendicular to the first direction (Z). The metal part (152) includes a plurality of first metal wires (1521) and a plurality of second metal wires (1522). The plurality of first metal wires (1521) are spaced apart along the second direction (X) and are all connected to the plastic part (151). The plurality of second metal wires (1522) are spaced apart along the third direction (Y) and are all connected to the plastic part (151). The plurality of first metal wires (1521) and the plurality of second metal wires (1522) are intersected to form a plurality of vent holes (1531).

11. A battery pack, characterized in that, Includes the battery cell according to any one of claims 1 to 10.

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