Battery

Abstract

Battery comprising: a housing, the housing comprising a receiving cavity open on one side; an electrode sheet assembly, the electrode sheet assembly being provided in the receiving cavity and comprising a positive electrode sheet and a negative electrode sheet, wherein an end of the negative electrode sheet facing away from the open side of the receiving cavity is in contact with the housing and is joined by welding.

Description

Cross-Reference to Related ApplicationsThe present application was filed based on Chinese Patent Application Serial No. 202320294741.X, the filing date of February 23, 2023, and the priority of the Chinese Patent Application was claimed. The entire contents of this Chinese patent application are hereby incorporated by reference into the present application.Technical FieldThe present application relates to the field of battery technology, in particular to a battery.Background ArtIn the existing battery, a negative terminal strip is used that is welded to the electrode sheet assembly and the case, and the negative electrode cover is then welded to the case, the negative terminal strip being only a transition piece, which complicates the assembly process and makes the cost high.Contents of the ApplicationThe object of the present application is to solve at least one of the technical problems existing in the prior art.To this end, the present application aims to provide a battery that can reduce the manufacturing cost of the battery.According to an embodiment of the present application, the battery includes: a case, the case having a receiving cavity open on one side; an electrode sheet assembly, the electrode sheet assembly being provided in the receiving cavity and including a positive electrode sheet and a negative electrode sheet; and an end of the negative electrode sheet facing away from the open side of the receiving cavity is in contact with the case and connected by welding.By welding the negative electrode sheet to the case according to the present application, the joining step between the case and the negative electrode sheet can be simplified, the number of components can be reduced, the battery manufacturing cost can be decreased, and at the same time, a stable joint between the case and the negative electrode sheet can be secured.According to some embodiments of the present application, the battery further includes: a cover plate, the cover plate being covered on the open side of the case, and a through hole penetrating the cover plate being formed in the cover plate; a positive pole, one end of the positive pole being connected to the positive electrode sheet, and the other end of the positive pole protruding from the accommodation cavity through the through hole.According to some optional embodiments of the present application, the positive pole is formed with a liquid injection hole penetrating the positive pole along the axial direction of the through hole, and the battery further comprises: a sealing member, wherein the sealing member is provided at the position of the liquid injection hole for blocking the liquid injection hole.According to some optional embodiments of the present application, the liquid injection hole includes a first hole portion and a second hole portion, the first hole portion is connected to an end of the second hole portion facing the accommodation cavity, and the cross-sectional size of the first hole portion is smaller than the cross-sectional size of the second hole portion, the sealing member includes: a sealing column and a sealing plate, the sealing column is blocked in the first hole portion, the sealing plate is provided in the second hole portion, and the sealing plate covers an end of the first hole portion connected to the second hole portion.According to some embodiments of the present application, the battery further includes: an upper insulating member including an insulating portion and a sealing portion, wherein each of the insulating portion and the sealing portion annularly extends along the circumferential direction of the positive pole, the insulating portion abuts between the upper surface of the cover plate and the positive pole, and the sealing portion is connected to the radially inner end of the insulating portion, extends along the axial direction of the through hole toward the accommodation cavity, and the sealing portion abuts between the circumferential wall of the through hole and the positive pole.According to some optional embodiments of the present application, the battery further includes: a lower insulating member, wherein the lower insulating member is coated on the positive pole, the lower insulating member is provided in the accommodation cavity, and is located between the cover plate and the electrode sheet assembly.According to some embodiments of the present application, a side surface of the cover plate facing away from the receiving cavity is a first surface and the other side surface facing the receiving cavity is a second surface, the cover plate having a first protrusion, the first protrusion protruding from a part of the cover plate from the first surface toward the second surface, and the first protrusion defining a groove on a side facing away from the receiving cavity, the through hole penetrating the first protrusion.According to some optional embodiments of the present application, the cover plate includes a second protrusion, wherein the second protrusion protrudes from a portion of the cover plate from the second surface toward the first surface, the second protrusion extends annularly around the groove, and the second protrusion is located radially outside the groove.According to some embodiments of the present application, the battery further comprises: a positive terminal strip, wherein the positive terminal strip is provided in the receiving cavity and is located at an end of the electrode sheet assembly facing the cover plate, the positive electrode sheet is electrically connected to the positive terminal via the positive terminal strip.According to some embodiments of the present application, the housing includes a cylindrical portion and an end plate portion, the cylindrical portion is cylindrical with both open ends, and the end plate portion covers one end of the cylindrical portion, wherein a convex rib is formed on the end plate portion, the convex rib is annular, and the convex rib protrudes from a part of the end plate portion from a side surface of the end plate portion facing the accommodation cavity toward the other side surface, and / or an explosion-proof zone is formed on the end plate portion.Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.FIGS. FiguresFIG. 1 is a schematic diagram of a battery according to an embodiment of the present application; FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1 ; FIG. 3 is an enlarged partial view of B of FIG. 2 ; FIG. 4 is a schematic diagram of the battery shown in FIG. 1 from a different viewpoint; FIG. 5 is a schematic diagram of the battery shown in FIG. 1 from another viewpoint. The black shaded area in the figure is the welding area between the negative electrode sheet and the case.Reference numerals in the figures:100. Battery; 10th Case; 11th Cylindrical portion; 12th End plate portion; 121th Convex rib; 122th Explosion-proof zone; 1221 Explosion-proof notch; 13th Accommodation cavity; 20th Electrode sheet assembly; 30th Cover plate; 31st First protrusion; 32nd Second protrusion; 40th Positive pole; 41st Liquid injection hole; 411th First portion; 412th Second portion; 50th Sealing member; 51th Sealing column; 52th Sealing plate; 60th Upper insulating member; 61th Insulating portion; 62th Sealing portion; 70th Lower insulating member; 80th Positive terminal strip.DESCRIPTION OF SPECIFIC EMBODIMENTSHereinafter, the embodiments of the present application will be described in detail. Examples of the embodiments are illustrated in the accompanying drawings, wherein like or similar reference numerals represent like or similar elements or elements having like or similar functions throughout. The exemplary embodiments described below with reference to the drawings are exemplary and serve merely to explain the present application and cannot be understood as limiting the present application.The battery 100 according to the embodiment of the present application will be described below with reference to the attached FIGS. 1 to 6.As shown in FIGS. 1 and 2, the battery according to the present application includes: a case 10 and an electrode sheet assembly 20, the case 10 including a receiving cavity 13 open on one side; the electrode sheet assembly 20 being provided in the receiving cavity 13 and including a positive electrode sheet and a negative electrode sheet, an end of the negative electrode sheet facing away from the open side of the receiving cavity 13 being in contact with the case 10 and joined by welding. Optionally, the shape of the housing 10 may be a cylinder, a triangular cylinder, a rectangular cylinder, or other cylindrical shapes.For example, as shown in FIG. 2, the housing 10 is cylindrical, the positive electrode sheet is located at the upper end of the accommodation cavity 13, the negative electrode sheet is located at the lower end of the accommodation cavity 13, and the lower end surface of the negative electrode sheet is welded to the housing 10. Preferably, the negative electrode sheet and the case 10 are welded and joined using a penetration welding method to ensure the joining strength between the negative electrode sheet and the case 10.The battery 100 of the present application is connected by welding the negative electrode sheet and the case 10. In this way, the connection between the negative electrode sheet and the case 10 can be realized without the need for providing a negative terminal tab, whereby the connection steps between the case 10 and the negative electrode sheet can be simplified, the number of parts can be reduced, and the manufacturing cost of the battery 100 can be reduced, and at the same time, the stable connection between the case 10 and the negative electrode sheet can be ensured.In the battery 100 according to the embodiment of the present application, by welding the negative electrode sheet and the case 10, the joining steps between the case 10 and the negative electrode sheet can be simplified, the number of parts is reduced, and the manufacturing cost of the battery 100 is reduced. At the same time, the stable connection between the case 10 and the negative electrode sheet can be ensured.According to some embodiments of the present application, as shown in FIGS. 2 and 3, the battery 100 may further include: a cover plate 30 and a positive pole 40, the cover plate 30 being covered on the open side of the housing 10, the cover plate 30 being formed with a through hole penetrating the cover plate 30; one end of the positive pole 40 being connected to the positive electrode sheet, and the other end of the positive pole 40 protruding from the accommodation cavity 13 through the through hole. By the arrangement of the cover plate 30, the cover plate 30 cooperates with the housing 10 to form the outer structure of the battery 100 and thereby protect the internal components of the battery 100. At the same time, a through hole is provided in the cover plate 30 to allow the internal components of the battery 100 to protrude more easily from the through hole, thereby facilitating connection with other components; by disposing the positive pole 40 and electrically connecting the positive pole 40 and the positive plate, the positive electrode of the battery 100 can be connected to the outside of the battery 100 via the positive electrode sheet, thereby facilitating electrical connection between a plurality of batteries 100.For example, as shown in FIGS. 2 and 3, the cover plate 30 is circular, the cover 30 covers the upper open side of the housing 10, and a circular through hole is provided at the center of the cover 30. The cross section of the positive pole 40 passing through the central axis of the positive pole 40 is I-shaped, the lower end of the positive pole 40 is electrically connected to the positive electrode sheet, and the upper end of the positive pole 40 protrudes from the through hole.According to some embodiments of the present application, as shown in FIGS. 1 and 3, the positive pole 40 is formed with a liquid injection hole 41 penetrating the positive pole 40 along the axial direction of the through hole, and the battery 100 further includes: a sealing member 50, the sealing member 50 being provided at the position of the liquid injection hole 41 for blocking the liquid injection hole 41. By disposing the liquid injection hole 41 in the positive pole 40, the electrolyte can be easily injected into the battery 100. At the same time, the liquid injection hole 41 is kept away from the negative electrode sheet, whereby the electrolyte can be prevented from contaminating important parts of the battery 100 during the injection operation or upon explosion of the battery 100; by the provision of the blocking member 50, the electrolyte can be effectively prevented from flowing out of the liquid injection hole 41. At the same time, the entire battery 100 forms a sealed environment after the blocking member 50 blocks the liquid injection hole 41, which can ensure the safe operation of the battery 100.According to some optional embodiments of the present application, as shown in FIGS. 1, 2, and 3, the liquid injection hole 41 includes a first hole portion and a second hole portion, the first hole portion is connected to an end of the second hole portion facing the accommodation cavity 13 (see the lower end of the second hole portion in FIG. 3 ), and the cross-sectional size of the first hole portion is smaller than the cross-sectional size of the second hole portion, the sealing member 50 includes: a sealing column 51 and a sealing plate 52, the sealing column 51 is blocked in the first hole portion, the sealing plate 52 is provided in the second hole portion, and the sealing plate covers an end of the first hole portion connected to the second hole portion (see the upper end of the first hole portion in FIG. 3 ). By the cooperation between the seal pillar 51 and the first hole portion, a first seal layer is formed. The cooperation of the sealing column 52 and the second hole portion forms a second sealing layer. In this way, the sealing member 50 can completely seal the liquid injection hole 41 and effectively prevent leakage of electrolyte from the liquid injection hole 41.For example, as shown in FIG. 3, the liquid injection hole 41 includes: a first hole portion, a second hole portion, and a third hole portion. The upper end of the first hole segment is connected to the second hole segment, and the lower part of the first hole segment is connected to the third hole segment. The cross-sectional size of the third hole segment is larger than the cross-section of the first hole segment and smaller than the cross-section of the second hole segment. In this way, the machining of the liquid injection hole 41 can be facilitated, and at the same time, the seal member 50 can be easily formed to form a double-layered seal on the liquid injection hole 41. Moreover, it may also facilitate the injection of electrolyte.According to some embodiments of the present application, as shown in FIGS. 2 and 3, the battery 100 further includes: an upper insulating member 60 including an insulating portion 61 and a sealing portion 62, wherein each of the insulating portion 61 and the sealing portion 62 annularly extends along the circumferential direction of the positive pole 40, the insulating portion 61 abuts between the upper surface of the cover plate 30 and the positive pole 40, and the sealing portion 62 is connected to the radially inner end of the insulating portion 61, extends along the axial direction of the through hole toward the accommodation cavity 13, and the sealing portion 62 abuts between the circumferential wall of the through hole and the positive pole 40. By disposing the insulating portion 61, the positive pole 40 can be separated from the upper surface of the cover plate 30, thereby preventing short-circuiting of the battery 100 and ensuring smooth operation of the battery 100; by disposing the sealing member 62, the connection between the through hole and the positive pole 40 can be sealed, thereby effectively preventing the electrolyte from leaking out of the connection member. Moreover, in this embodiment, as compared with the prior art solution in which the insulating portion 61 and the sealing portion 62 are separately disposed, the insulating portion 61 and the sealing body are integrally molded into the upper insulating member 60. The insulating and sealing functions can be achieved only by the arrangement of the insulating element 60, so that the installation process can be simplified and costs can be saved.For example, as shown in FIGS. 2 and 3, the upper insulating member 60 includes an insulating portion 61 and a sealing portion 62. the insulating portion 61 includes an insulating plate and an insulating flange. The insulating plate is plate-shaped and arranged along the left and right directions, the upper surface of the insulating plate abuts against the pole post, and the lower surface of the insulating plate abuts against the cover plate 30. The left end of the insulation panel is connected to an upwardly projecting insulation flange, the left surface of the insulation flange abuts the cover plate 30, and the right surface of the insulation flange abuts the positive pole 40. The seal portion 62 is connected to the right end of the insulating plate, and the seal portion 62 extends downward, the lower end of the seal portion 62 abuts the lower insulating member 70, the left surface of the seal portion 62 abuts the through hole, and the right surface of the seal portion 62 abuts the positive pole 40.Preferably, the upper insulating member 60 is made of rubber. In this way, the upper insulating member 60 has good elasticity, is non-conductive, and can simultaneously perform the functions of insulation and sealing.According to some embodiments of the present application, as shown in FIG. 2, a lower insulating member 70, wherein the lower insulating member 70 is coated on the positive pole 40, the lower insulating member 70 is provided in the accommodation cavity 13, and is located between the cover plate 30 and the electrode sheet assembly 20. Therefore, the lower insulating member 70 can prevent the electrical connection between the cover plate 30 and the electrode sheet assembly 20 to avoid a short circuit, and at the same time, the lower insulating member 70 can cooperate with the upper insulating member 60 to prevent the positive pole 40 from contacting the cover plate 30 and causing a short circuit in the battery 100.Preferably, the lower insulating member 70 is made of rubber. In this way, the lower insulating member 70 has good elasticity, is non-conductive, and can exhibit an insulating effect.According to some embodiments of the present application, as shown in FIGS. 1 and 2, a side surface of the cover plate 30 facing away from the accommodation cavity 13 is a first surface and the other side surface facing the accommodation cavity 13 is a second surface, the cover plate 30 includes a first protrusion 31, the first protrusion 31 protruding from a part of the cover plate 30 from the first surface toward the second surface, and the first protrusion 31 defines a groove on a side facing away from the accommodation cavity 13, the through hole penetrating the first protrusion 31. Therefore, the first protrusion 31 can increase the strength of the cover plate 30 and prevent the cover plate 30 from being damaged. At the same time, the first protrusion 31 defines a groove that can reserve an installation space for the upper insulating member 60. Moreover, disposing a through hole in the first protrusion 31 can facilitate the processing of the through hole and make the structure appropriate.According to some optional embodiments of the present application, as shown in FIGS. 1 and 2, the cover plate 30 includes a second protrusion 32, the second protrusion 32 protruding from a part of the cover plate 30 from the second surface toward the first surface, the second protrusion 32 annularly extends around the groove, and the second protrusion 32 is located radially outside the groove. Therefore, the second protrusion 32 and the first protrusion 31 cooperate to further reinforce the strength of the cover plate 30.For example, as shown in FIG. 2, the first protrusion 31 is disposed radially inward of the second protrusion 32. The first protrusion 31 protrudes downward, and a through hole penetrating through the cover 30 is formed in the center of the first protrusion 31, the second protrusion 32 protrudes upward, and the first protrusion 31 and the second protrusion 32 cooperate to improve the strength of the cover plate 30.According to some embodiments of the present application, as shown in FIGS. 1 and 2, the battery 100 further includes: a positive terminal strip 80, wherein the positive terminal strip 80 is provided in the accommodation cavity 13 and is located at an end of the electrode sheet assembly 20 facing the cover plate 30, the positive electrode sheet being electrically connected to the positive terminal 40 via the positive terminal strip 80. Thereby, the positive electrode of the battery 100 is connected to the positive terminal 40 via the positive terminal tab 80, thereby leading the positive electrode to the upper surface of the battery 100 to facilitate connection between the batteries 100.For example, the positive terminal strip 80 is circular as shown in FIG. 2. The lower surface of the positive terminal tab 80 is connected to the positive electrode sheet, and the upper surface of the positive terminal tab 80 is connected to the positive pole 40 to lead the positive electrode of the battery 100 from the inside of the battery 100 to the outer surface of the battery 100.According to some embodiments of the present application, as shown in FIGS. 2, 3, and 4, the housing 10 includes a cylindrical portion 11 and an end plate portion 12, the cylindrical portion 11 is cylindrical with both open ends, and the end plate portion 12 covers one end of the cylinder part 11, a convex rib 121 is formed on the end plate portion 12, the convex rib 121 is annular, and the convex rib 121 protrudes from a part of the end plate portion 12 toward the other side surface from a side surface of the end plate portion 12 facing the accommodation cavity 13. By disposing the end plate portion 12, the opening on one side of the cylindrical portion 11 can be closed. In this way, the end plate portion 12 and the cylindrical portion 11 form a housing 10 having only one open side. After mating with the cover plate 30, a closed outer structure of the battery 100 is formed. At the same time, convex ribs 121 are provided on the end plate portion 12 to increase the strength of the end plate portion 12 and thus the strength of the housing 10.For example, as shown in FIGS. 2 and 5, the end plate portion 12 covers the lower end of the cylindrical portion 11, and a plurality of downwardly protruding convex ribs 121 are formed on the end plate portion 12, whereby the strength of the end plate portion 12 can be increased. Preferably, the end plate portion 12 may be welded and joined to the cylindrical portion 11 to ensure the joining strength. The end plate portion 12 may also be formed integrally with the cylindrical portion 11 to ensure the sealing performance of the housing 10.According to some embodiments of the present application, as shown in FIG. 4, an explosion-proof zone 122 is formed on the end plate portion 12. Therefore, when the battery 100 heats or the internal gas expands, the explosion-proof zone 122 may release the internal gas of the battery 100, thereby protecting the battery 100 and preventing explosion of the battery 100.For example, as shown in FIG. 5, an annular explosion-proof notch 1221 is provided within the explosion-proof zone 122. When the battery 100 bursts inside the battery 100 due to external pressure or excessive stress, the explosion-proof notch 1221 breaks to release the internal pressure and prevent a strong explosion.The battery 100 according to the embodiment of the present application will be described below with reference to FIGS. 1 to 5.As shown in FIG. 1, the battery 100 according to the embodiment of the present application is a cylindrical battery 100. The cylindrical battery 100 includes a housing 10, an electrode sheet assembly 20, a cover plate 30, a positive pole 40, a sealing member 50, an upper insulating member 60, a lower insulating member 70, and a positive terminal strip 80.The housing 10 includes a cylindrical portion 11 and an end plate portion 12, and the cylindrical portion 11 is open at both upper and lower sides. The end plate portion 12 covers the lower part of the cylindrical portion 11, and the cylindrical portion 11 and the end plate part 12 are integrally formed. The end plate portion 12 is provided with convex ribs 121 and an explosion-proof zone 122, and the explosion-proof zone 122 is provided with an explosion-proof notch 1221. The cover plate 30 covers the upper opening of the housing 10. The cover plate 30 and the housing 10 form the basic external structure of the battery 100, and the housing 10 and the cover plate 30 define a receiving cavity 13. At the same time, a through hole is also formed on the cover plate 30.The electrode sheet assembly 20 includes: a positive electrode sheet and a negative electrode sheet. The positive electrode sheet is disposed in the upper part of the accommodation cavity 13, and the upper end of the positive electrode sheet is provided with a positive terminal tab 80. The negative electrode sheet is disposed in the lower part of the accommodation cavity 13, and the negative electrode sheet is welded to the housing 10. The lower end of the positive pole 40 is connected to the positive terminal strip 80, and the upper end of the positive pole 40 extends out of the through hole of the cover plate 30, and at the same time, a liquid injection hole 41 penetrating the positive pole 40 is formed in the center of the positive pole 40. The liquid injection hole 41 is divided into a first portion 411, a second portion 412, and a third portion. The seal member 50 is provided with a seal column 51 and a seal plate 52. The seal pillar 51 is inserted into the first portion 411 to form a first seal layer, and the seal plate 52 covers the second portion 412 to form a second seal layer.The insulating assembly includes: an upper insulating member 60 and a lower insulating member 70. the upper insulating member 60 has an insulating portion 61 and a sealing portion 62. The insulating portion 61 and the sealing portion 62 both extend annularly along the circumferential direction of the positive pole 40, and the insulating portion 61 abuts between the upper surface of the cover plate 30 and the positive pole 40. The seal portion 62 is connected to the radially inner end of the insulating portion 61 and extends toward the accommodation cavity 13 along the axial direction of the through hole. The lower insulating member 70 is coated on the positive pole 40, and the lower insulating member 70 is disposed in the accommodation cavity 13 and between the cover plate 30 and the positive electrode sheet.In the battery 100 of the present application, the negative electrode sheet and the case 10 are joined by penetration welding. This eliminates the need to provide a negative terminal strip, which can reduce the assembly process and save manufacturing costs. At the same time, the upper insulating element 60 performs the functions of insulation and sealing. Compared with the existing technology in which the upper resin and seal ring is provided, it can further simplify the process and reduce the cost. Moreover, the liquid injection hole 41 is provided in the positive pole 40 to prevent contamination of the explosion-proof notch 1221 during liquid injection.In the battery 100 according to the embodiment of the present application, by joining the negative electrode sheet and the case 10 by welding, the joining steps between the case 10 and the negative electrode sheet can be simplified, the number of parts and components is reduced, the manufacturing cost of the battery 100 is reduced, and the stable connection between the case 10 and the negative electrode sheet can be secured. At the same time, the upper insulating member 60 has the function of insulation and sealing, which can further simplify the process and reduce the cost. Moreover, the liquid injection hole 41 is far from the explosion-proof notch 1221 to prevent contamination of the explosion-proof notch 1221 during liquid injection.In describing the present application, it is necessary to note that an azimuth or positional relationship related to the terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "top", "bottom", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential direction", and the like has the azimuth or positional relationship based on the drawing. They are intended to facilitate and simplify the description of the present application, rather than indicating or implying that the stated device or component must have a particular orientation, must be constructed and operated in a particular orientation. Therefore, it should not be understood as a limitation of the present application.Moreover, the terms "first" and "second" are used for descriptive purposes only and cannot be understood to indicate relative meaning or indicate or implicitly indicate the set of technical features indicated. Thus, features defined as "first" and "second" may expressly or implicitly comprise one or more of these features. In the specification of this application, "multiple" means two or more than two unless expressly and specifically otherwise limited.In describing the exemplary embodiments of the present application, it is necessary to point out that the terms "installation", "connection", "connection" and "fastening" are to be understood in the broader sense, unless expressly stated otherwise or restricted. For example, it may be a fixed connection, a detachable connection, or a one-piece connection; it may be a mechanical connection, an electrical connection, or a communication; it may be a direct connection or an indirect connection via an intermediate medium; and it may be a connection within the two elements or an interaction between the two elements. For general technical personnel in this field, the specific meaning of the above terms in the present application can be understood depending on the specific circumstances.In the description of this specification, reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some example," or the like, means that certain features, structures, materials, or characteristics associated with the embodiment or example are included in at least one embodiment or example of the application. In the present specification, schematic diagrams 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. Moreover, the technical staff can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification unless they conflict with each other.Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made in these embodiments without departing from the principles and purposes of the present application. The scope of the application is defined by the claims and their equivalents.References included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedCN 202320294741

[0001]

Claims

A battery, comprising: a case, the case comprising a receiving cavity open on one side; an electrode sheet assembly, the electrode sheet assembly provided in the receiving cavity and comprising a positive electrode sheet and a negative electrode sheet, wherein an end of the negative electrode sheet opposite from the open side of the receiving cavity is in contact with the case and connected by welding.The battery according to claim 1, further comprising: a cover plate, the cover plate being covered on the open side of the case, the cover plate being formed with a through hole penetrating the cover plate; a positive pole, one end of the positive pole being connected to the positive electrode sheet, and the other end of the positive pole protruding out of the accommodation cavity through the through hole.The battery according to claim 2, wherein the positive pole is formed with a liquid injection hole penetrating the positive pole along the axial direction of the through hole, and the battery further comprises: a sealing member, wherein the sealing member is provided at the position of the liquid injection hole for blocking the liquid injection hole.The battery of claim 3, wherein the liquid injection hole comprises a first hole portion and a second hole portion, the first hole portion is connected to an end of the second hole portion facing the accommodation cavity, and the cross-sectional size of the first hole portion is smaller than the cross-sectional size of the second hole portion, the sealing member comprises: a sealing column and a sealing plate, the sealing column is blocked in the first hole portion, the sealing plate is provided in the second hole portion, and the sealing plate covers an end of the first hole portion connected to the second hole portion.The battery according to any one of claims 2 to 4, further comprising: an upper insulating member comprising an insulating portion and a sealing portion, wherein each of the insulating portion and the sealing portion annularly extends along the circumferential direction of the positive pole, the insulating portion abuts between the upper surface of the cover plate and the positive pole, and the sealing portion is connected to the radially inner end of the insulating portion, extends along the axial direction of the through hole toward the accommodation cavity, and the sealing portion abuts between the circumferential wall of the through hole and the positive pole.The battery of claim 5, further comprising: a lower insulating member, wherein the lower insulating member is coated on the positive pole, the lower insulating member is provided in the accommodation cavity, and is located between the cover plate and the electrode sheet assembly.The battery of any one of claims 2 to 6, wherein one side surface of the cover plate facing away from the receiving cavity is a first surface and the other side surface facing the receiving cavity is a second surface, the cover plate having a first protrusion, the first protrusion protruding from a part of the cover plate from the first surface toward the second surface, and the first protrusion defining a groove on a side facing away from the receiving cavity, the through hole penetrating the first protrusion.The battery of claim 7, wherein the cover plate includes a second protrusion, the second protrusion protrudes from a portion of the cover plate from the second surface toward the first surface, the second protrusion extends annularly around the groove, and the second protrusion is radially outward of the groove.The battery of any of claims 2 to 8, further comprising: a positive terminal strip, wherein the positive terminal strip is provided in the receiving cavity and is located at an end of the electrode sheet assembly facing the cover plate, the positive electrode sheet being electrically connected to the positive pole via the positive terminal strip.The battery according to any one of claims 1 to 9, wherein the case comprises a cylindrical portion and an end plate portion, the cylindrical portion is cylindrical with both open ends, and the end plate portion covers one end of the cylindrical portion, wherein a convex rib is formed on the end plate portion, the convex rib is annular, and the convex rib protrudes from a part of the end plate portion from a side surface of the end plate portion facing the accommodation cavity toward the other side surface, and / or an explosion-proof zone is formed on the end plate portion.

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