Battery cell, battery pack and electric device

Abstract

The application provides an electric core, a battery pack and a power utilization device. The electric core comprises a shell, a cover plate, an electrode assembly, a first current collector and an abutting piece. The cover plate is covered with the shell to define a containing cavity. The electrode assembly is arranged in the containing cavity. The first current collector is arranged between the electrode assembly and the cover plate and connected with the electrode assembly and the shell. The abutting piece is arranged between the first current collector and the cover plate, and the two sides of the abutting piece are respectively abutted with the first current collector and the cover plate. Through the above scheme, the first current collector is in a fixed state in the axial direction of the electric core, so as to effectively avoid the shaking of the first current collector relative to the cover plate, thereby avoiding the mutual scraping of the first current collector and the cover plate to generate metal debris. In this way, the internal overcurrent stability of the electric core can be improved, so as to improve the reliability of the electric core.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery cell, a battery pack, and an electrical device. Background Technology

[0002] The battery cell includes a casing, terminals extending through the casing, and an electrode assembly disposed within the casing. The electrode assembly includes a positive electrode plate, a separator, and a negative electrode plate stacked and wound sequentially. Typically, the positive electrode plate is connected to the terminal plate sequentially via a positive tab and a positive current plate, and the negative electrode plate is connected to the casing sequentially via a negative tab and a negative current plate. This allows the battery cell to serve as the positive and negative output terminals via the terminal plate and the casing, respectively.

[0003] Currently, the reliability of battery cells is relatively low. Utility Model Content

[0004] Embodiments of this application provide a battery cell, a battery pack, and an electrical device that can improve the reliability of the battery cell.

[0005] In a first aspect, embodiments of this application provide a battery cell comprising a housing, a cover plate, an electrode assembly, a first current collector, and an abutment member. The cover plate closes to the housing to define a receiving cavity. The electrode assembly is disposed within the receiving cavity. The first current collector is disposed between the electrode assembly and the cover plate, and is connected to both the electrode assembly and the housing. The abutment member is disposed between the first current collector and the cover plate, with its two sides abutting against the first current collector and the cover plate, respectively. Thus, by having the two sides of the abutment member abut against the first current collector and the cover plate, the first current collector is fixed in the axial direction of the battery cell, effectively preventing the first current collector from wobbling relative to the cover plate, thereby preventing the first current collector and the cover plate from scraping against each other and generating metal debris. This improves the internal overcurrent stability of the battery cell, thereby enhancing its reliability.

[0006] In some embodiments, the abutment is an elastic member, and it is in an elastically compressed state along the axial direction of the battery cell. Thus, by setting the abutment to an elastically compressed state along the axial direction of the battery cell, after the battery cell is assembled, the pre-compression of the abutment allows it to press tightly against the top cover and the first current collector, thereby eliminating axial clearances caused by machining and assembly errors. This effectively prevents the first current collector from wobbling relative to the top cover, and further prevents the first current collector from scraping against the cover plate, thus avoiding the generation of metal debris and improving the reliability of the battery cell.

[0007] In some embodiments, the height dimension of the abutment in its original state is H, and the height dimension of the abutment in its elastically compressed state is H1, satisfying: 0.7H ≤ H1 ≤ 0.98H. This allows the abutment to be in a compressed state, eliminating axial gaps between components inside the cell and ensuring stable contact between the abutment and the first current collector and the cover plate. Furthermore, it prevents excessive compression of the abutment, which could lead to excessive axial pressure on the internal components of the cell.

[0008] In some embodiments, the abutment is a flexible plastic part. This allows the abutment to be both flexible and have a lower density and lower material cost, which is beneficial for improving the energy density and economy of the battery cell.

[0009] In some embodiments, the abutment is a corrugated sheet. This increases the elasticity of the abutment, which is a resilient plastic part, thereby increasing the elastic deformation of the abutment to provide space for the expansion of the electrode assembly and the tabs after the first collector and the top cover are tightened.

[0010] In some embodiments, the surface of the abutment member facing the electrode assembly is provided with a plurality of first annular grooves, and the surface of the abutment member facing the cover plate is provided with a plurality of second annular grooves. The first and second annular grooves are sequentially staggered along the radially outward direction of the battery cell. This design not only makes the abutment member a corrugated sheet, but also improves the symmetry of the abutment member about the axis of the battery cell, thereby improving the central symmetry of the battery cell, enhancing the uniformity of force distribution on the battery cell, and ultimately improving the reliability of the battery cell.

[0011] In some embodiments, the abutment is a spring with a plastic layer covering its surface. The plastic layer allows the spring to make soft contact with the first manifold and the top cover, thereby protecting the parts of the first manifold and the top cover that are in elastic contact and preventing contact scratches.

[0012] In some embodiments, a plating layer is provided on the inner wall of the housing adjacent to the first current collector. The plating layer is made of the same material as the first current collector, and the first current collector is connected to the housing through the plating layer. This ensures that the part of the housing in contact with the first current collector is made of the same material as the first current collector, thereby preventing scratches caused by differences in hardness between dissimilar metals. This effectively prevents metal debris from being generated by the first current collector rubbing against the housing, thus improving the overcurrent stability inside the battery cell and enhancing its reliability.

[0013] In some embodiments, the wall thickness of the housing is D, and the thickness of the coating is D1, satisfying: 0.2%D≤D1≤1%D. This ensures, on the one hand, that the coating has sufficient thickness to guarantee reliable contact between the first collector and the coating; on the other hand, it avoids unnecessary increases in material costs due to excessively thick coatings.

[0014] In some embodiments, the end of the housing near the cover plate is recessed to form a groove on the outer surface of the housing and a convex ring on the inner surface of the housing; wherein, the first current collector is located between the convex ring and the electrode assembly, and is connected to the surface of the convex ring facing the electrode assembly. In this way, the end face of the first current collector can also be connected to the housing to increase the flow area between the first current collector and the housing, thereby improving the reliability of the flow between the first current collector and the housing.

[0015] In some embodiments, a plating layer is provided on the surface of the convex ring facing the electrode assembly and on the surface of the housing opposite the first current collector along the radial direction of the cell. The plating layer is made of the same material as the first current collector, and the first current collector is connected to the housing through the plating layer. This ensures that the part of the housing that contacts the first current collector is made of the same material as the first current collector, thereby preventing scratches caused by differences in hardness between dissimilar metals. This effectively prevents metal debris from being generated by the first current collector rubbing against the housing, thereby improving the overcurrent stability inside the cell and enhancing the reliability of the cell.

[0016] In some embodiments, the first current collector includes a disk body and a flange. The disk body is connected to the electrode assembly, and the flange is located on the side of the disk body near the convex ring, connecting to the outer periphery of the disk body and the convex ring. This increases the flow area between the first current collector and the housing, thereby improving the reliability of the flow between the first current collector and the housing.

[0017] In some embodiments, the battery cell further includes terminals, a second current collector, and an insulating component. The terminals are inserted through the housing and the cover plate, and are insulated from the housing. The second current collector is located at the end of the electrode assembly opposite to the first current collector, and is connected to the terminals and the electrode assembly. The insulating component is located on the side of the second current collector opposite to the electrode assembly. This allows users to directly determine the positive and negative terminals of the battery cell through its external structure, improving ease of use.

[0018] Secondly, embodiments of this application provide a battery pack including the aforementioned battery cells, wherein there are multiple battery cells electrically connected to each other. This fixes the first current collector in the axial direction of the battery cell, effectively preventing the first current collector from wobbling relative to the cover plate. This avoids the first current collector and the cover plate from rubbing against each other and generating metal debris, thereby improving the internal overcurrent stability of the battery cell and enhancing its reliability. Thus, the reliability of the battery pack is improved.

[0019] Thirdly, embodiments of this application provide an electrical device including the aforementioned battery pack. This fixes the first current collector in the axial direction of the battery cell, effectively preventing it from wobbling relative to the cover plate. This avoids metal debris generated by the first current collector rubbing against the cover plate, thereby improving the internal overcurrent stability of the battery cell and enhancing its reliability. This, in turn, improves the reliability of the electrical device.

[0020] The beneficial effects of the embodiments of this application are as follows:

[0021] In the embodiments of this application, by setting the two sides of the abutment member to abut against the first current collector and the cover plate respectively, the first current collector is fixed in the axial direction of the cell, which effectively prevents the first current collector from shaking relative to the cover plate, thereby preventing the first current collector and the cover plate from scraping against each other and generating metal debris. In this way, the overcurrent stability inside the cell can be improved, which is conducive to improving the reliability of the cell. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the electrical equipment provided in the embodiments of this application;

[0024] Figure 2 This is a schematic diagram of the battery pack structure provided in an embodiment of this application;

[0025] Figure 3 This is a schematic diagram of the battery cell structure provided in an embodiment of this application;

[0026] Figure 4 yes Figure 3 An enlarged schematic diagram of part A in the middle;

[0027] Figure 5 This is a schematic diagram of the longitudinal section structure of an abutment member provided in an embodiment of this application;

[0028] Figure 6 yes Figure 5 The diagram shows the structure of the abutment component;

[0029] Figure 7 yes Figure 3 Enlarged diagram of part B.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1000 - Vehicles;

[0032] 200 - Battery pack; 21 - Case; 22 - Case cover;

[0033] 300 - Motor; 400 - Controller;

[0034] 10-cell;

[0035] 11-First collector disk; 111-Disk body; 112-Flanged edge;

[0036] 12-Second Collector Disk;

[0037] 13-Housing shell; 131-Groove; 132-Protruding ring; 133-Coating;

[0038] 14-Cover plate; 141-Score; 142-Sealing ring;

[0039] 15-Electrode assembly;

[0040] 16-Abutting part; 161-First annular groove; 162-Second annular groove; 163-Exhaust hole;

[0041] 17-Receiving cavity; 18-Pole post; 19-Insulating component. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] Furthermore, it should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of this application. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0044] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, an integral connection, or contact and abutment; they can refer to a mechanical connection, an electrical connection, or a connection that allows for mutual communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0045] The terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a product that comprises a list of elements includes not only those elements but also other elements not expressly listed or inherent to such a product.

[0046] Before introducing a battery cell and battery pack provided in the embodiments of this application, the relevant technologies of this application will be introduced first.

[0047] In related technologies, the negative current collector of the battery cell is made of copper, while the outer casing is made of steel or aluminum. The outer casing includes a shell and a top cover that fit together. During use, the battery cell generates heat, causing the electrode assembly to expand and bringing the current collector into contact with the top cover. When the battery cell is subjected to vibration, the current collector will wobble relative to the top cover. Because friction occurs between metals of different hardness when they come into contact and move relative to each other, scratches will form on the surface of the metal with lower hardness, resulting in metal debris. This reduces the internal overcurrent stability of the battery cell, lowers its reliability, and adversely affects its performance.

[0048] Based on this, embodiments of this application provide a battery cell and battery pack that can prevent the current collector from moving relative to the top cover, thereby effectively preventing scratches from forming on the opposing surfaces between the current collector and the top cover, and thus preventing metal debris from forming inside the battery cell. This improves the stability of overcurrent within the battery cell, thereby enhancing its reliability.

[0049] The following combination Figures 1 to 7 The present application provides a detailed description of a battery cell, a battery pack, and an electrical device according to embodiments thereof.

[0050] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0051] like Figure 1As shown, vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The interior of vehicle 1000 can house a battery pack 200, a controller 400, and a motor 300. The controller 400 controls the power supply from the battery pack 200 to the motor 300. For example, the battery pack 200 can be located at the bottom of vehicle 1000. The battery pack 200 can supply power to the electrical devices of vehicle 1000. For example, the battery pack 200 can serve as the power source for driving vehicle 1000, or as the power source for the vehicle 1000's electronic control system. Specifically, the battery pack 200 can meet the power needs of vehicle 1000 during startup, navigation, and operation.

[0052] To meet different power demands, the battery pack 200 may include multiple battery cells 10, which are electrically connected, such as... Figure 2 As shown. Multiple battery cells 10 can be connected in series, parallel, or a combination thereof. A combination thereof means that some battery cells 10 are connected in series, while others are connected in parallel. Optionally, multiple battery cells 10 can first be connected in series, parallel, or a combination thereof to form a battery module, and then multiple battery modules can be connected in series, parallel, or a combination thereof to form a battery pack 200. That is, multiple battery cells 10 can directly form a battery pack 200, or they can first be formed into multiple battery modules, and then the multiple battery modules can be combined to form a battery pack 200.

[0053] It is understood that the battery pack 200 may also include a housing 21 and a cover 22. The housing 21 and the cover 22 fit together to define an installation cavity. The battery cell 10 is disposed within the installation cavity.

[0054] It is understandable that the battery pack 200 may also include a power management system, which is also located within the mounting cavity.

[0055] Please see Figure 3 and Figure 4 The battery cell 10 provided in the embodiments of this application includes a housing 13, a cover plate 14, an electrode assembly 15, a first current collector 11, and an abutment member 16. The cover plate 14 covers the housing 13 to define a receiving cavity 17. The electrode assembly 15 is disposed within the receiving cavity 17. The first current collector 11 is disposed between the electrode assembly 15 and the cover plate 14, and is connected to both the electrode assembly 15 and the housing 13. The abutment member 16 is disposed between the first current collector 11 and the cover plate 14. Both sides of the abutment member 16 abut against the first current collector 11 and the cover plate 14, respectively.

[0056] The cover plate 14 can be welded to the housing 13, or it can be fitted with a sealing ring 142. Specifically, the housing 13 is a steel shell, and the cover plate 14 is a steel plate. A sealing ring 142 is provided around the circumference of the cover plate 14. The sealing ring 142 is clamped at the end of the housing 13 near the cover plate.

[0057] It is understood that the electrode assembly 15 includes a positive electrode sheet, a separator, and a negative electrode sheet stacked and wound sequentially. The positive electrode sheet includes a positive current collector and a positive active material layer, the positive active material layer being coated on the surface of the positive current collector; the positive current collector includes a positive current collection section and a positive tab, the positive current collection section being coated with the positive active material layer, and the positive tab not being coated with the positive active material layer. The negative electrode sheet includes a negative current collector and a negative active material layer, the negative active material layer being coated on the surface of the negative current collector; the negative current collector includes a negative current collection section and a negative tab, the negative current collection section being coated with the negative active material layer, and the negative tab not being coated with the negative active material layer. One of the positive and negative tabs is connected to the first current collector plate 11. Specifically, the negative tab is welded to the first current collector plate 11. The positive tab can be connected to the electrode post 18 insulated on the housing 13 via the positive current collector plate.

[0058] It is understood that the abutting part 16 abuts against the first current collector 11 and the cover plate 14, thereby making the first current collector 11 in a fixed state in the axial direction of the cell 10 and unable to wobble relative to the cover plate 14.

[0059] For example, the abutment 16 can be a metal part, a ceramic plate, a plastic part, etc. When the abutment 16 is a metal part, it contacts the plane of the top cover and the first collector plate 11, and the material of the side of the metal part that contacts the first collector plate 11 is the same as the material of the first collector plate 11, and the material of the side of the metal part that contacts the top cover is the same as the material of the top cover. When the abutment 16 is a ceramic plate, the ceramic plate contacts the plane of the top cover and the first collector plate 11. When the abutment 16 is a plastic part, since the hardness of the plastic part is lower than the stress of the first collector plate 11 and the top cover, it can directly abut against the top cover and the first collector plate 11.

[0060] For example, the abutment 16 may be elastic and compressed in the axial direction of the cell 10. In this way, the elastic compression property of the abutment 16 can be used to eliminate gaps caused by processing errors and assembly errors, thereby reducing manufacturing and assembly difficulties.

[0061] For example, the abutment 16 is interference-fitted between the first collector plate 11 and the cover plate 14, thereby eliminating axial clearance caused by machining errors and assembly errors, so that the abutment 16 is stably kept in contact with the first collector plate 11 and the cover plate 14.

[0062] The cover plate 14 may be provided with a groove 141 as an explosion-proof valve for the battery cell 10. The part of the abutment 16 opposite to the groove on the cover plate 14 is provided with a vent hole 163 to facilitate the release of gas inside the battery cell 10 and ensure the reliability of the battery cell 10.

[0063] In this embodiment, by setting the two sides of the abutment member 16 to abut against the first current collector 11 and the cover plate 14 respectively, the first current collector 11 is fixed in the axial direction of the cell 10, which effectively prevents the first current collector 11 from shaking relative to the cover plate 14, thereby preventing the first current collector 11 and the cover plate 14 from scraping against each other and generating metal debris. In this way, the overcurrent stability inside the cell 10 can be improved, which is conducive to improving the reliability of the cell 10.

[0064] In some embodiments, the abutment 16 is an elastic member. In the axial direction of the cell 10, the abutment 16 is in an elastically compressed state.

[0065] It is understandable that the abutment 16 is flexible.

[0066] For example, the abutment 16 can be a spring, an elastic plastic part, etc.

[0067] In this embodiment, by setting the abutment member 16 to be in an elastically compressed state in the axial direction of the cell 10, after the cell 10 is assembled, the pre-compression of the abutment member 16 can make the abutment member 16 press against the top cover and the first collector plate 11, thereby eliminating the axial gap caused by processing errors and assembly errors, effectively preventing the first collector plate 11 from shaking relative to the top cover plate, and thus preventing the first collector plate 11 from scraping against the cover plate 14 and generating metal debris, which helps to improve the reliability of the cell 10.

[0068] In addition, the height dimension of the fully compressed abutment member 16 is smaller than the gap between the first collector plate 11 and the cover plate 14. In this way, when the electrode assembly 15 expands, the abutment member 16 can be further compressed to absorb the expansion force of the electrode assembly 15, providing a buffer space for the expansion of the electrode assembly 15, thereby improving the stress state of the cell 10. Furthermore, the abutment member 16 can be further compressed to provide sufficient accommodation space for the tab and avoid damage to the tab.

[0069] Please see Figure 4 and Figure 5 In some embodiments, the height dimension of the abutment member 16 in its original state is H, and the height dimension of the abutment member 16 in the elastic compression state is H1, satisfying: 0.7H≤H1≤0.98H.

[0070] It is understood that the compression of the abutment 16 between the first manifold 11 and the top cover is 2%H to 30%H of the original height.

[0071] It is understood that the height dimension H1 of the abutment 16 in the elastic compression state includes, but is not limited to, 2%H, 2.3%H, 2.9%H, 3.7%H, 4.1%H, 5.5%H, 6.8%H, 7.3%H, 8.2%H, 9.5%H, 10.1%H, 11.2%H, 12.4%H, 13.9%H, 14.7%H, 15.6%H, 16.3%H, 17.2%H, 18.8%H, 19.4%H, 20.5%H, 21.7%H, 22.3%H, 23.6%H, 24.2%H, 25.1%H, 26.7%H, 27.5%H, 28.3%H, 29.1%H, and 30%H.

[0072] In this embodiment, the above-mentioned limitations can, on the one hand, allow the abutment 16 to be in a compressed state to eliminate the axial gap between the components inside the cell 10, so that the abutment 16 can stably maintain contact with the first collector plate 11 and the cover plate 14; on the other hand, it can prevent the compression of the abutment 16 from being too large, which would cause excessive axial pressure on the components inside the cell 10.

[0073] In some embodiments, the abutment 16 is an elastic plastic part.

[0074] For example, the abutment 16 can be made of plastic materials such as PP (Polypropylene), PPS (Polyphenylene Sulfide), PBT (Polybutylene Terephthalate), and PFA (Perfluoroalkoxy Alkane), which do not react with the electrolyte and have the strength required for installation.

[0075] In this embodiment, by setting the abutment 16 as an elastic plastic part, the abutment 16 can be elastic, and the abutment 16 can also have a lower density and lower material cost, which is conducive to improving the energy density and economy of the battery cell 10.

[0076] Please see Figure 6 In some embodiments, the abutment 16 is a corrugated sheet.

[0077] It is understandable that the projection of the abutment 16 in a plane perpendicular to the axis of the battery cell 10 can be circular, such as... Figure 6 As shown, the projection of the abutment 16 can also be a rectangle.

[0078] In this embodiment, by setting the abutment 16 as a corrugated sheet, the elasticity of the abutment 16, which is an elastic plastic part, can be increased, thereby increasing the elastic deformation of the abutment 16. This is beneficial for providing space for the expansion of the electrode assembly 15 and the electrode tabs after the first collector plate 11 and the top cover are tightened.

[0079] Please see Figure 5 and Figure 6 In some embodiments, the surface of the abutment 16 facing the electrode assembly 15 is provided with a plurality of first annular grooves 161. The surface of the abutment 16 facing the cover plate 14 is provided with a plurality of second annular grooves 162. The first annular grooves 161 and second annular grooves 162 are arranged alternately in a radially outward direction along the cell 10. In this way, the abutment 16 is made of corrugated sheet, and the symmetry of the abutment 16 about the axis of the cell 10 can be improved, thereby improving the central symmetry of the cell 10, improving the uniformity of force on the cell 10, and thus improving the reliability of the cell 10.

[0080] Specifically, along the axis of the battery cell 10, a second annular groove 162 is positioned opposite to a groove 141 on the cover plate 14, and an exhaust port 163 is located at the bottom of the second annular groove 162. Thus, the second annular groove 162 connects all the exhaust ports 163, facilitating the rapid concentration of internal air pressure on the groove 141, allowing the cover plate 14 to quickly open and release pressure at the groove 141.

[0081] In some other embodiments, the abutment 16 is a spring with a plastic layer covering its surface. The plastic layer allows the spring to make soft contact with the first collector plate 11 and the top cover, thereby protecting the parts of the first collector plate 11 and the top cover that are in elastic contact and preventing contact scratches.

[0082] Please see Figure 7 In some embodiments, a plating layer 133 is provided on the inner wall of the housing 13 at a location adjacent to the first collector disk 11. The material of the plating layer 133 is the same as the material of the first collector disk 11. The first collector disk 11 is connected to the housing 13 through the plating layer 133.

[0083] For example, the first manifold 11 is made of copper, and correspondingly, the plating layer 133 is made of copper.

[0084] It is understandable that the first collector plate 11 can be welded to the plating layer 133 or can be in contact with the plating layer 133.

[0085] In this embodiment, the above-described solution ensures that the portion of the housing 13 that contacts the first current collector 11 is made of the same material as the first current collector 11, thereby preventing scratches caused by the difference in hardness between dissimilar metals. This effectively prevents metal debris from being generated by the first current collector 11 rubbing against the housing 13, thus improving the overcurrent stability inside the battery cell 10 and enhancing its reliability.

[0086] Please see Figure 7 In some embodiments, the wall thickness of the housing 13 is D, and the thickness of the plating 133 is D1, satisfying: 0.2%D≤D1≤1%D.

[0087] It is understood that the thickness D1 of the coating 133 includes, but is not limited to, 0.2%D, 0.23%D, 0.25%D, 0.28%D, 0.31%D, ​​0.33%D, 0.35%D, 0.39%D, 0.41%D, 0.42%D, 0.45%D, 0.48%D, 0.51%D, 0.53%D, 0.57%D, 0.59%D, 0.62%D, 0.67%D, 0.69%D, 0.72%D, 0.75%D, 0.78%D, 0.82%D, 0.85%D, 0.88%D, 0.91%D, 0.93%D, 0.96%D, 0.98%D, and 1%D.

[0088] In this embodiment, the above-mentioned limitations ensure that the coating 133 has sufficient thickness to guarantee the reliability of the contact between the first collector disk 11 and the coating 133; on the other hand, they can prevent the coating 133 from being too thick, which would lead to unnecessary increases in material costs.

[0089] Please see Figure 1 and Figure 7 In some embodiments, the end of the housing 13 near the cover plate 14 is recessed to form a groove 131 on the outer surface of the housing 13 and a convex ring 132 on the inner surface of the housing 13. The first collector plate 11 is located between the convex ring 132 and the electrode assembly 15, and is connected to the surface of the convex ring 132 facing the electrode assembly 15. This allows the end face of the first collector plate 11 to also connect to the housing 13, increasing the flow area between the first collector plate 11 and the housing 13, thereby improving the reliability of the flow between the first collector plate 11 and the housing 13.

[0090] Please see Figure 7In some embodiments, a plating layer 133 is provided on the surface of the convex ring 132 facing the electrode assembly 15 and on the surface of the housing 13 along the radial direction of the cell 10 opposite to the first current collector 11. The material of the plating layer 133 is the same as that of the first current collector 11. The first current collector 11 is connected to the housing 13 through the plating layer 133. In this way, the part of the housing 13 that contacts the first current collector 11 is made of the same material as the first current collector 11, thereby avoiding scratches caused by the difference in hardness between dissimilar metals. This effectively prevents the first current collector 11 and the housing 13 from rubbing against each other and generating metal debris, thereby improving the overcurrent stability inside the cell 10 and thus improving the reliability of the cell 10.

[0091] Please see Figure 7 In some embodiments, the first current collector 11 includes a disk body 111 and a flange 112. The disk body 111 is connected to the electrode assembly 15. The flange 112 is located on the side of the disk body 111 near the convex ring 132. The flange 112 is connected to the outer periphery of the disk body 111 and the convex ring 132. In this way, the flow area between the first current collector 11 and the housing 13 can be increased, thereby improving the reliability of the flow between the first current collector 11 and the housing 13.

[0092] It is understandable that the connection between the flange 112 and the disc 111 is an arc structure, which fits with the rounded corner of the convex ring 132 on the side away from the axis of the battery cell 10.

[0093] Please see Figure 1 In some embodiments, the battery cell 10 further includes a terminal post 18, a second current collector 12, and an insulating member 19. The terminal post 18 passes through the portion of the housing 13 opposite to the cover plate 14 and is insulated from the housing 13. The second current collector 12 is disposed at one end of the electrode assembly 15 away from the first current collector 11. The second current collector 12 is connected to the terminal post 18 and the electrode assembly 15. The insulating member 19 is disposed on the side of the second current collector 12 away from the electrode assembly 15.

[0094] It is understandable that the insulating component 19 can also be called the lower plastic component, which insulates and isolates the second collector 12 and the electrode assembly 15 from the housing 13.

[0095] In this embodiment, the above-mentioned settings allow users to directly determine the positive and negative terminals of the battery cell 10 through its external structure, thereby improving ease of use.

[0096] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery cell (10), characterized in that, include: Shell (13); A cover plate (14) closes to the housing (13) to define a receiving cavity (17); An electrode assembly (15) is disposed within the receiving cavity (17); A first collector plate (11) is disposed between the electrode assembly (15) and the cover plate (14), and is connected to the electrode assembly (15) and the housing (13); and An abutment (16) is disposed between the first collector plate (11) and the cover plate (14), with both sides of the abutment (16) abutting against the first collector plate (11) and the cover plate (14) respectively.

2. The battery cell (10) according to claim 1, characterized in that, The abutment (16) is an elastic member, and in the axial direction of the battery cell (10), the abutment (16) is in an elastic compression state.

3. The battery cell (10) according to claim 2, characterized in that, Along the axial direction of the battery cell (10), the height dimension of the abutment (16) in its original state is H, and the height dimension of the abutment (16) in the elastic compression state is H1, satisfying: 0.7H≤H1≤0.98H.

4. The battery cell (10) according to claim 2, characterized in that, The abutment (16) is an elastic plastic part.

5. The battery cell (10) according to claim 4, characterized in that, The abutment (16) is a corrugated sheet.

6. The battery cell (10) according to claim 5, characterized in that, The abutment (16) has a plurality of first annular grooves (161) on the surface facing the electrode assembly (15), and the abutment (16) has a plurality of second annular grooves (162) on the surface facing the cover plate (14). The first annular grooves (161) and the second annular grooves (162) are arranged alternately along the radial outward direction of the battery cell (10).

7. The battery cell (10) according to claim 2, characterized in that, The abutment (16) is a spring with a plastic layer covering its surface.

8. The battery cell (10) according to any one of claims 1-7, characterized in that, A plating layer (133) is provided on the inner wall of the housing (13) at a location adjacent to the first collector disk (11). The material of the plating layer (133) is the same as that of the first collector disk (11). The first collector disk (11) is connected to the housing (13) through the plating layer (133).

9. The battery cell (10) according to claim 8, characterized in that, The wall thickness of the shell (13) is D, and the thickness of the coating (133) is D1, satisfying: 0.2%D≤D1≤1%D.

10. The battery cell (10) according to any one of claims 1-7, characterized in that, The housing (13) is recessed at one end near the cover plate (14) to form a groove (131) on the outer surface of the housing (13) and a convex ring (132) on the inner surface of the housing (13); The first collector disk (11) is located between the convex ring (132) and the electrode assembly (15), and is connected to the surface of the convex ring (132) facing the electrode assembly (15).

11. The battery cell (10) according to claim 10, characterized in that, A plating layer (133) is provided on the surface of the convex ring (132) facing the electrode assembly (15) and on the surface of the housing (13) opposite to the first current collector (11) along the radial direction of the cell (10). The material of the plating layer (133) is the same as that of the first current collector (11). The first current collector (11) is connected to the housing (13) through the plating layer (133).

12. The battery cell (10) according to claim 10, characterized in that, The first collector disk (11) includes a disk body (111) and a flange (112). The disk body (111) is connected to the electrode assembly (15). The flange (112) is located on the side of the disk body (111) close to the convex ring (132). The flange (112) is connected to the outer periphery of the disk body (111) and the convex ring (132).

13. The battery cell (10) according to any one of claims 1-7, characterized in that, The battery cell (10) also includes a terminal post (18), a second current collector (12), and an insulating component (19). The terminal post (18) passes through the housing (13) and the cover plate (14) opposite to each other and is insulated from the housing (13). The second current collector (12) is disposed at the end of the electrode assembly (15) away from the first current collector (11). The second current collector (12) is connected to the terminal post (18) and the electrode assembly (15). The insulating component (19) is disposed on the side of the second current collector (12) away from the electrode assembly (15).

14. A battery pack (200), characterized in that, The battery cell (10) includes any one of claims 1-13, and there are multiple battery cells (10) electrically connected to each other.

15. An electrical appliance, characterized in that, Includes the battery pack (200) as described in claim 14.

Images