Battery end cap and battery

Abstract

To provide a battery end cap and a battery.SOLUTION: A first groove is provided in at least a partial region of a first surface of a battery end cap, a first protrusion 230 is provided in at least a partial region of a third surface 210 of a lower insulating member 200, and the first protrusion is accommodated in the first groove. A second groove is provided in a portion corresponding to the first protrusion of a fourth surface, and a bottom of the second groove is higher than a lowest position of a cap plate 100 along a first direction. An end of an electrode terminal 320 opposite to a connection plate 310 extends up to a second surface 120 while penetrating a lower insulating member and the cap plate. The connection plate is provided in the second groove and abuts against a bottom wall of the second groove. The battery end cap can reduce a space occupied by the lower insulating member and the connection plate in a battery housing, thereby increasing a volume and capacity of the cells in the housing, and thus increasing the capacity of the battery.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to the technical field of batteries, and more particularly to battery end caps and batteries. [Background technology]

[0002] As society becomes more conscious of energy conservation and environmental protection, new energy vehicles are being vigorously developed, among which electric vehicles are one of many new energy vehicles, and electric vehicles mainly rely on batteries to provide driving energy for the vehicle.

[0003] For electric bicycles, the range of the battery is directly related to its capacity. The higher the energy density or capacity of the battery, the more electrical energy a single battery can provide, contributing to improving the range of the electric vehicle.

[0004] However, the volume of cells that can be accommodated in the batteries in the related arts described above is small, which leads to a decrease in the capacity of the battery and a decrease in the electrical energy that the battery can provide. Summary of the Invention [Problem to be solved by the invention]

[0005] The embodiments of the present invention provide a battery end cap and a battery that are used to solve the technical problem that the volume of cells that can be accommodated in the batteries in the related art described above is small, which leads to a decrease in the capacity of the battery and a decrease in the electrical energy that the battery can provide. [Means for solving the problem]

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A first embodiment of the present invention provides a battery end cap. The battery end cap includes a cap plate, a lower insulating member, and an electrode lead-out member. The cap plate has first and second surfaces opposite each other along the thickness direction, and a first groove is formed in at least a portion of the first surface. The lower insulating member has third and fourth surfaces opposite each other along the thickness direction, and a first protrusion is formed in at least a portion of the third surface, the third surface being closer to the first surface of the lower insulating member, and the first protrusion is received in the first groove. A second groove is formed in a portion of the fourth surface corresponding to the first protrusion. A bottom of the second groove is higher than a lowest point of the cap plate along a first direction, and the first direction is a direction in which the fourth surface faces the third surface. The electrode lead-out member includes a connection plate and an electrode terminal, which are interconnected. One end of the electrode terminal opposite the connection plate extends through the lower insulating member and the cap plate to the second surface. The connecting plate is disposed in the second groove and abuts against a bottom wall of the second groove.

[0008] In one possible embodiment, the height of the first ridge is equal to or less than the depth of the first groove.

[0009] In one possible embodiment, the thickness of the lower insulating member at the location of the first protrusion is equal to or less than the depth of the first groove.

[0010] In one possible embodiment, the thickness of the first ridge is less than the depth of the first groove, and the side of the first ridge closer to the first surface abuts the bottom of the first groove.

[0011] In one possible embodiment, a second protrusion is provided on the second surface at a portion corresponding to the first groove, and the thickness of the second protrusion is equal to the thickness of the cap plate.

[0012] In one possible embodiment, a distance from an outer surface of the second protrusion to the second surface along the thickness direction of the cap plate is a first distance, and a ratio of the first distance to the thickness of the cap plate is greater than or equal to 0.1 and less than or equal to 0.8.

[0013] In one possible embodiment, the second ridge includes a ridge portion and a transition portion, one end of the transition portion is connected to the second surface of the cap plate, and the other end of the transition portion is connected to the ridge portion, and the transition portion is inclined toward the ridge portion with respect to the second surface.

[0014] In one possible implementation, the transition portion includes a fifth surface and a sixth surface that are located opposite each other. A shortest distance from the fifth surface to the sixth surface in a direction perpendicular to the inclination of the transition portion is a second distance. A ratio of the second distance to a thickness of the cap plate is 0.3 to 0.9.

[0015] In one possible embodiment, a receiving area is provided between the connecting plate and the opening of the second groove, the receiving area being used to receive the tab after it has been folded onto the cell, and the depth of the receiving area in the first direction is at least twice the thickness of the tab after it has been folded.

[0016] In one possible embodiment, the lower insulating member includes a first structure, which is the first protrusion, and a second structure, the second structure is connected to the outer edge of the first protrusion, and the second structure and the first structure form the second groove, and the wall surface of the first structure facing the connecting plate is the bottom wall of the second wall.

[0017] In one possible embodiment, the second structure has a maximum thickness in the first direction of a third distance, the third distance being equal to or greater than 2 mm and equal to or less than 5 mm.

[0018] In one possible embodiment, the thickness of the first structure in the first direction is less than the depth of the first groove, so that at least a portion of the connecting plate is located in the first groove.

[0019] In one possible embodiment, there is a first gap between an end of the first structure opposite to the connecting plate and a side wall of the first groove.

[0020] In one possible embodiment, there is a second gap between the connecting plate and the sidewall of the second groove.

[0021] A second aspect of the present invention provides a battery comprising a cell and a battery end cap as described above. [Effects of the Invention]

[0022] An embodiment of the present invention provides a battery end cap and a battery. The battery end cap has a first groove on a first surface of a cap plate and a first protrusion on a lower insulating member that fits into the first groove. This reduces the amount of space occupied by the lower insulating member inside the battery housing when the cap plate is placed over the housing. This allows the height of cells that can be accommodated in the housing to be increased while maintaining the battery housing volume unchanged, thereby increasing the cell volume and battery capacity, and ultimately increasing the electrical energy that the battery can provide.

[0023] Furthermore, a second groove is provided on the fourth surface of the lower insulating member at a portion corresponding to the first protrusion, allowing the connection plate of the electrode leading member to be positioned within the second groove and abut against the inner wall of the second groove. One end of the electrode terminal opposite the connection plate extends through the lower insulating member and the cap plate to the second surface. The second groove can also be used to accommodate a folded tab on a cell interconnected with the connection plate in the first direction. This further reduces the tab's occupation of the internal space of the battery housing. This further increases the height of cells that can be accommodated within the housing while maintaining the battery housing volume unchanged, thereby further increasing the cell volume and battery capacity, and ultimately increasing the electrical energy that the battery can provide. [Brief explanation of the drawings]

[0024] In order to more clearly describe the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. The drawings described below are only some embodiments of the present invention, and it is obvious that those skilled in the art can obtain other embodiments based on these drawings without expending creative efforts.

[0025] [Figure 1] FIG. 1 is an exploded view of a battery end cap provided by an embodiment of the present invention. [Figure 2] FIG. 10 is a structural view of the battery end cap provided by an embodiment of the present invention from another angle. [Figure 3] 3 is a cross-sectional view of the battery end cap taken along the line AA in FIG. 2. [Figure 4] FIG. 4 is a partial view of FIG. 3. DETAILED DESCRIPTION OF THE INVENTION

[0026] As mentioned in the background section, prior art batteries can accommodate a small volume of cells, which leads to a decrease in the capacity of the battery and a decrease in the electrical energy that the battery can provide.

[0027] This problem occurs because, in the assembly process of a battery in the prior art, the lower insulating member is installed inside the battery housing, and if the height of the housing remains unchanged, the longer the lower insulating member is in the housing in the height direction, the more space the lower insulating member occupies in the housing in the height direction, and accordingly the height of the cells that can be accommodated in the housing becomes lower, which reduces the volume of the cells that can be accommodated in the battery housing, leading to a reduction in the capacity of the battery and a reduction in the electrical energy that the battery can provide.

[0028] To address the above technical challenges, embodiments of the present invention provide a battery end cap and a battery. The battery end cap has a first groove on a first surface of a cap plate and a first protrusion on a lower insulating member that fits into the first groove. This reduces the amount of space occupied by the lower insulating member inside the battery housing when the cap plate is placed over the housing. This allows the height of cells that can be accommodated in the housing to be increased while maintaining the volume of the battery housing unchanged, thereby increasing the cell volume and battery capacity, and ultimately the electrical energy that the battery can provide.

[0029] Furthermore, a second groove is provided on the fourth surface of the lower insulating member at a portion corresponding to the first protrusion, allowing the connection plate of the electrode leading member to be positioned within the second groove and abut against the inner wall of the second groove. One end of the electrode terminal opposite the connection plate extends through the lower insulating member and the cap plate to the second surface. The second groove can also be used to accommodate a folded tab on a cell interconnected with the connection plate in the first direction. This further reduces the tab's occupation of the internal space of the battery housing. This further increases the height of cells that can be accommodated within the housing while maintaining the battery housing volume unchanged, thereby further increasing the cell volume and battery capacity, and ultimately increasing the electrical energy that the battery can provide.

[0030] In order to facilitate a clearer understanding of the above-mentioned objectives, features and advantages of the present embodiment, the following clearly and completely describes the technical solutions in the embodiments of the present invention in combination with the accompanying drawings in the embodiments of the present invention. It is clear that the described embodiments are only a part of the embodiments, not all of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without expending creative efforts shall fall within the protection scope of the present invention.

[0031] Referring to FIG. 1 , an embodiment of the present invention provides a battery end cap. The battery end cap may include a cap plate 100, a lower insulating member 200, and an electrode lead-out member 300. The cap plate 100 may be a metal plate, and the connection plate 310 may also be a metal plate. The battery end cap 100 is used to interconnect with a battery housing to seal the cells within the housing.

[0032] The cell is provided in the housing. The cell includes a cell body, an external separator, and a tab. The external separator is provided to wrap around the outer periphery of the cell body. The tab is provided at one end of the cell body in the height direction facing the housing opening. The tab is in a folded state. During the battery assembly process, the tab is used to interconnect with the electrode lead-out member 300.

[0033] 1 and 2, the electrode leading member 300 may be a positive electrode leading member 300, or the electrode leading member 300 may be a negative electrode leading member 300. The positive electrode leading member 300 and the negative electrode leading member 300 may be provided simultaneously on the battery end cap.

[0034] The electrode lead-out member 300 may include a connection plate 310 and an electrode terminal 320. The connection plate 310 and the electrode terminal 320 are integrally formed and may be connected by welding. The connection plate 310 is used for electrical connection with a tab on the cell body.

[0035] 1 and 3, the cap plate 100 may include a first surface 110 and a second surface 120 opposite to each other along the thickness direction.

[0036] When connected to a housing, the first surface 110 faces the inside of the housing, and the second surface 120 faces the outside of the housing. The first surface 110 of the cap plate 100 has a first groove 130. The groove opening of the first groove 130 is provided along the thickness direction. When the cap plate 100 is placed on the housing, the groove opening of the first groove 130 can face the inside of the housing.

[0037] 3 , the lower insulating member 200 includes a third surface 210 and a fourth surface 220 that are provided on opposite sides along the thickness direction. A first protrusion 230 is provided on at least a portion of the third surface 210. The third surface 210 is on the side closer to the first surface 110 of the lower insulating member 200. The first protrusion 230 is accommodated in the first groove 130. It should be understood that the first protrusion 230 can be connected to the bottom wall of the first groove 230, and this connection may be by abutment, adhesion, or connection via a connecting member.

[0038] In this way, the battery end cap has the first groove 130 on the first surface 110 of the cap plate 100 and the first protrusion 230 on the lower insulating member 200 located within the first groove 130. This reduces the amount of space inside the battery housing occupied by the lower insulating member 200 when the cap plate 100 is placed over the battery housing. This allows the height of cells that can be accommodated in the housing to be increased while maintaining the battery housing volume unchanged, thereby increasing the cell volume and battery capacity, and ultimately increasing the electrical energy that the battery can provide.

[0039] 3 and 4, a second groove 240 is provided in a portion of the fourth surface 220 of the lower insulating member 200 corresponding to the first protrusion 230. A bottom of the second groove 240 is higher than the lowest position of the cap plate 100 along a first direction (indicated by arrow X in FIG. 3 ). The first direction is a direction in which the fourth surface 220 faces the third surface 210. One end of the electrode terminal 320 opposite the connecting plate 310 extends through the lower insulating member 200 and the cap plate 100 to the second surface 120. The connecting plate 310 is provided in the second groove 240 and abuts against the bottom wall of the second groove 240.

[0040] In this way, by using the bottom wall of the second groove 240 in the lower insulating member 200 to physically isolate the connecting plate 310 and the cap plate 100, electrical connection between the connecting plate 310 and the cap plate 100 can be avoided, and insulating isolation between the connecting plate 310 and the cap plate 100 can be achieved.

[0041] Furthermore, since the bottom of the second groove 240 is higher than the lowest position of the cap plate 100 along the first direction, a portion of the connection plate 310 along the thickness direction can be positioned within the first groove 130, and at least a portion of the connection plate 310 can be positioned within the cap plate 100, thereby reducing the occupation of the internal space of the housing by the connection plate 310, increasing the volume of cells that the housing can accommodate without changing the volume of the housing, and increasing the capacity of a single battery.

[0042] 3 and 4, in some embodiments, the thickness of the lower insulating member 200 at the location of the first ridge 230 is equal to or less than the depth of the first groove 130.

[0043] 3 and 4 , in some embodiments, the thickness of the first ridge 230 is less than the depth of the first groove 130. The side of the first ridge 230 closer to the first surface 110 abuts the bottom of the first groove 130, thereby positioning at least a portion of the connecting plate 310 within the first groove 130.

[0044] It should be understood that in the first direction, the first ridge 230 is located within the first groove 130 and at least a portion of the connecting plate 310 can also be located within the first groove 130 .

[0045] For example, in the thickness direction of the cap plate 100, the sum of the thickness of the first protrusion 230 and the thickness of a portion of the connecting plate 310 is equal to the depth of the first groove .

[0046] In this way, a portion of the lower insulating member 200 is positioned within the first groove 130, and at least a portion of the connecting plate 310 is also provided within the first groove 130, which further distances the connecting plate 310 from the internal space of the housing.

[0047] In some embodiments, a connection plate 310 can be used to electrically connect the tabs after they are folded onto the cell.

[0048] Therefore, when the thickness of the connection plate 310 is less than the depth of the second groove 240, the tab electrically connecting to the connection plate 310 can also be accommodated at least partially or entirely within the second groove 240. By accommodating the tab within the second groove 240, the amount of space occupied by the tab within the housing can be reduced, which in turn increases the capacity of the cell within the housing, thereby increasing the capacity of the battery without changing the volume of the housing.

[0049] 3 and 4, in some embodiments, a receiving area 241 is provided between the connecting plate 310 and the groove opening of the second groove 240 in the first direction. The opening of the receiving area 241 may be the opening of the second groove 240. The receiving area 241 is used to receive the tab after folding. When the battery end cap is placed on the housing, the opening of the receiving area 241 faces the inside of the housing and is used to receive the tab on the cell.

[0050] It should be understood that the receiving area 241 can accommodate a portion of the folded tab in at least the first direction. For example, the receiving area 241 can accommodate the entire folded tab in the first direction, thereby reducing the tab's occupation of space within the housing. This can increase the volume of the battery that can be accommodated within the housing without changing the space within the housing, thereby increasing the battery capacity.

[0051] In a specific implementation, the depth of the receiving area 241 in the first direction is at least twice the thickness of the tab after being folded.

[0052] If the depth of the receiving area 241 in the first direction is twice the thickness of the tab after folding, the tab of the cell can be completely stored within the receiving area 241, and the tab can be prevented from occupying the internal space of the housing. A larger size cell can be stored within the housing without changing the height of the housing, which in turn increases the capacity of the battery and the electrical energy that the battery can provide.

[0053] 3 and 4, in some embodiments, a second ridge 140 is provided on the second surface 120 at a portion corresponding to the first groove 130. The thickness of the second ridge 140 is equal to the thickness of the cap plate 100.

[0054] In this way, by making the thickness of the second protrusion 140 equal to the thickness of the cap plate 100, the thickness of the cap plate 100 can be maintained almost unchanged, preventing the strength of the cap plate 100 in the area where the first groove 130 is present from being reduced due to a decrease in thickness, thereby increasing the overall strength of the battery end cap.

[0055] 3 and 4, in some embodiments, the first groove 130 can be formed by stamping the cap plate 100. The stamped groove formed after stamping the first surface 110 of the cap plate 100 is referred to as the first groove 130. The second surface 120 has a stamped protrusion corresponding to the stamped groove. In the first direction, the distance from the surface of the stamped groove to the surface of the stamped protrusion is equal to the thickness of the cap plate 100.

[0056] By forming the first groove 130 by stamping in this manner, the thickness of the stamped area of ​​the cap plate 100 can be made approximately equal to the thickness of the non-stamped area of ​​the cap plate 100, thereby maintaining the thickness of the cap plate 100 almost unchanged. Compared to a method of forming the first groove 130 on the first surface 110 of the cap plate 100 by thinning, a decrease in the strength of the cap plate 100 in the area where the first groove 130 is present due to thinning can be avoided, thereby increasing the overall strength of the battery end cap.

[0057] 3 and 4, in some embodiments, the distance from the outer surface of the second protrusion 140 to the second surface 120 in the first direction along the thickness direction of the cap plate 100 is a first distance (shown as distance L1 in FIG. 4). The ratio of the first distance to the thickness of the cap plate 100 is greater than or equal to 0.1 and less than or equal to 0.8.

[0058] In some embodiments, if the thickness of the cap plate 100 is 2 mm, the first distance may be 0.2 mm, 0.4 mm, 1.1 mm, or 1.6 mm.

[0059] In this way, by setting the ratio of the first distance to the thickness of the cap plate 100 to 0.8 or less, it is possible to avoid an excessively large ratio that would increase the difficulty of manufacturing the first groove 130, and it is also possible to avoid a decrease in the strength of the cap plate 100 that would occur if the thickness of the connection point between the first groove 130 and the cap plate 100 were excessively thin due to the first groove 130 being excessively deep.

[0060] Furthermore, when the first groove 130 is a stamping groove, if the ratio of the first distance to the thickness of the cap plate 100 is 0.1 or more, it is possible to avoid a situation where the depth of the first groove 130 becomes shallow due to the fluidity of the metal due to an excessively small ratio, making it impossible to accommodate the lower insulating member 200, and it is possible to reduce the space occupied by the lower insulating member 200 within the housing.

[0061] 3 and 4, in some embodiments, the second ridge 140 may include a ridge portion 141 and a transition portion 142.

[0062] One end of the transition portion 142 connects to the second surface 120 of the cap plate 100, and the other end of the transition portion 142 connects to the ridge portion 141. The transition portion 142 can be used to connect the cap plate 100 and the top of the second ridge 140. The transition portion 142 is inclined toward the ridge portion 141 with respect to the second surface 120.

[0063] In this way, when the first groove 130 is a stamped groove and the second protrusion 140 is a stamped protrusion, the stamping accuracy can be reduced and the processing efficiency of the stamped groove can be improved compared to when the transition portion 142 is provided perpendicular to the second surface 120.

[0064] 3 and 4, in some embodiments, the transition portion 142 has a fifth surface 143 and a sixth surface 144 that are opposed to each other.

[0065] The shortest distance from the fifth surface 143 to the sixth surface 144 in the inclined direction perpendicular to the transition portion 142 is a second distance (shown as distance L2 in FIG. 4). The ratio of the second distance to the thickness of the cap plate 100 is not less than 0.3 and not more than 0.9.

[0066] In some embodiments, if the thickness of the cap plate 100 is 2 mm, the second distance may be 0.6 mm, 0.8 mm, 1.1 mm, 1.6 mm, or 1.8 mm.

[0067] In this way, by making the ratio of the second distance to the thickness of the cap plate 100 0.3 or more, it is possible to avoid the thickness of the transition portion 142 becoming too thin due to the second distance being too short, thereby avoiding the problem of the transition portion 142 breaking due to the thickness of the transition portion 142 being too thin, and improving the stability of the structure.

[0068] Furthermore, by setting the ratio of the second distance to the thickness of the cap plate 100 to 0.9 or less, it is possible to avoid the problem that the transition portion 142 cannot be formed due to the fluidity of the metal caused by the second distance being too long.

[0069] 3 and 4, in some embodiments, the protrusion height of the first ridge 230 is equal to or less than the recessed depth of the first groove 130.

[0070] In this way, since the height of the first protrusion 230 is less than the recess depth of the first groove 130, the first protrusion 230 can be completely accommodated within the first groove 130, preventing a gap from occurring between the third surface 210 of the lower insulating member 200 and the first surface 110 of the cap plate 100. This improves the connection stability between the lower insulating member 200 and the cap plate 100 and reduces the space occupied by the lower insulating member 200 within the housing.

[0071] 3 and 4, in some embodiments, the lower insulating member 200 may include a first structure 250 and a second structure 260.

[0072] The first structure 250 is located in the first groove 130, and the first structure 250 is located between the connecting plate 310 and the bottom wall of the first groove 130. The first structure 250 is used to electrically insulate the connecting plate 310 and the cap plate 100, and the first structure 250 may be the first protrusion 230.

[0073] The second structure 260 can be connected to the outer edge of the first ridge 230, so that the second structure 260 and the first structure 250 form the second groove 240. The wall surface of the first structure 250 facing the connecting plate 310 is the bottom wall of the second groove 240. The wall surface of the second structure 260 facing the connecting plate 310 can be part of the side wall of the second groove 240.

[0074] In this way, by positioning the first structure 250 of the lower insulating member 200 within the first groove 130, a partial structure of the lower insulating member 200 can be provided inside the cap plate 100, thereby reducing the space occupied by the entire structure of the lower insulating member 200 inside the housing. This in turn allows for a larger-sized cell to be accommodated in the housing without changing the height of the housing, thereby increasing the capacity of the battery.

[0075] 3 and 4, in some embodiments, the maximum thickness of the second structure 260 in the first direction is a third distance (shown as distance L3 in FIG. 4). The third distance is greater than or equal to 2 mm and less than or equal to 5 mm.

[0076] In some embodiments, the third distance may be 2 mm, 3 mm, 4 mm, or 4.5 mm.

[0077] Thus, when the third distance is 2 mm or more, it is possible to prevent the connection stability with the external separator from being affected due to the thickness of the second structure 260 being excessively thin. Also, when the third distance is 5 mm or less, it is possible to reduce the space occupied by the second structure 260 inside the housing, and it is possible to accommodate larger-sized cells in the housing and increase the capacity of the battery.

[0078] 3 and 4, in some embodiments, there is a first gap 270 between the end of the first structure 250 opposite the connecting plate 310 and the sidewall of the first groove 130.

[0079] In this way, by having a first gap 270 between one end of the first structure 250 opposite the connecting plate 310 and the side wall of the first groove 130, it is convenient to install the first structure 250 of the lower insulating member 200 within the first groove 130, which improves the assembly efficiency of the lower insulating member 200 and the cap plate 100, and ultimately improves the assembly efficiency of the battery end cap.

[0080] 3 and 4, in some embodiments, there is a third spacing 330 between the connecting plate 310 and the sidewall of the second groove 240.

[0081] In this way, by providing the third gap 330 between the connecting plate 10 and the side wall of the second groove 240, it is convenient to install the connecting plate 310 in the second groove 240, which improves the assembly efficiency of installing the connecting plate 310 in the second groove 240, and ultimately improves the assembly efficiency of the battery end cap.

[0082] An embodiment of the present invention further provides a battery, which may include a cell and the battery end cap described above.

[0083] In this way, by using the battery end caps described above, the space occupied by the lower insulating member 200 within the battery housing can be reduced without changing the height of the battery housing, and the space occupied by the tabs on the cells within the housing can be reduced, which in turn increases the height of the cells that can be accommodated within the housing, thereby increasing the battery capacity and the electrical energy that the battery can provide.

[0084] In this specification, each embodiment or implementation method is described in a step-by-step manner, with emphasis on the differences between each embodiment and other embodiments, and identical or similar parts between each embodiment can be mutually referenced.

[0085] It should be noted that, although embodiments described herein using phrases such as "in specific implementations," "in some embodiments," "in this embodiment," and "exemplary" may include a particular feature, structure, or characteristic, not every embodiment necessarily includes that particular feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in combination with an embodiment, it is within the knowledge of one skilled in the art to implement that feature, structure, or characteristic in combination with other embodiments, whether or not explicitly described.

[0086] In general, terms should be understood, at least in part, by their use in the context in which they are used. For example, as used herein, the term "one or more" may be used in the singular sense to describe any feature, structure, or characteristic, or in the plural sense to describe a combination of features, structures, or characteristics. Similarly, terms such as "a" or "the" may be understood to refer to either the singular or the plural, depending, at least in part, on the context.

[0087] It should be readily understood that the terms "on", "above", and "above" in this disclosure should be interpreted in the broadest sense, and that "on" not only means "directly on something", but also includes the implication of "on something" and including intervening features or layers, and that "on" or "above" not only includes the implication of "on something" or "on top of", but also the implication of "above something" or "on top of" without any intervening features or layers (i.e., directly on top of something).

[0088] Additionally, for convenience of explanation, spatially relative terms, such as "below," "lower," "below," "above," and "upward," may be used herein to describe the relationship of one component or feature to another component or feature as illustrated. Spatially relative terms are intended to encompass different orientations of the device during use or operation in addition to the orientation shown in the accompanying drawings. The device may be otherwise oriented (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein may be interpreted accordingly.

[0089] Finally, it should be noted that the above embodiments are only used to describe the technical solutions of the present invention and do not limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified or some or all of the technical features can be replaced with equivalents. Furthermore, such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention. [Industrial Applicability]

[0090] The battery housing volume remains unchanged while the height of the cells that can be accommodated in the housing is increased, thereby increasing the cell volume and battery capacity, and ultimately increasing the electrical energy that the battery can provide. [Explanation of symbols]

[0091] L1, L2, L3: distance 100: Cap plate 110: 1st page 120:Second side 130: 1st groove 140:Second uplift 141: Protuberance 142: Transition section 143:Side 5 144:Side 6 200: Lower insulating member 210:Side 3 220:Side 4 230:1st prominence 240:Second groove 241: Containment Area 250: 1st structure 260:Second structure 270: First interval 300: Electrode lead member 310: Connection plate 320: Electrode terminal 330: Second interval

Claims

1. a cap plate including a first surface and a second surface provided on opposite sides along a thickness direction, the first surface having a first groove formed in at least a partial region thereof; a lower insulating member including a third surface and a fourth surface provided on opposite sides along the thickness direction, a first protrusion provided in at least a partial region of the third surface, the third surface being closer to the first surface, the first protrusion being housed in the first groove, and a second groove being provided in a portion of the fourth surface corresponding to the first protrusion; an electrode lead-out member including an interconnected connection plate and an electrode terminal; Including, a bottom of the second groove is higher than a lowest position of the cap plate along a first direction, the first direction being a direction in which the fourth surface faces the third surface; One end of the electrode terminal opposite to the connection plate extends through the lower insulating member and the cap plate to the second surface, and the connection plate is disposed in the second groove and abuts against a bottom wall of the second groove. characterized in that Battery end cap.

2. The height of the first protrusion is equal to or less than the depth of the recess of the first groove. characterized in that 10. The battery end cap of claim 1.

3. The thickness of the first protrusion of the lower insulating member is equal to or less than the depth of the first groove. characterized in that 3. The battery end cap of claim 1 or 2.

4. The thickness of the first protrusion is less than the depth of the first groove, and the side of the first protrusion closer to the first surface abuts against the bottom of the first groove. characterized in that 4. The battery end cap of claim 3.

5. a second protrusion is provided on the second surface at a portion corresponding to the first groove; The thickness of the second protrusion is equal to the thickness of the cap plate. characterized in that 10. The battery end cap of claim 1.

6. a distance from an outer surface of the second protrusion to the second surface along a thickness direction of the cap plate is a first distance; The ratio of the first distance to the thickness of the cap plate is equal to or greater than 0.1 and equal to or less than 0.

8. characterized in that 6. The battery end cap of claim 5.

7. the second ridge includes a ridge portion and a transition portion; one end of the transition portion connects to the second surface of the cap plate, and the other end of the transition portion connects to the protrusion; The transition portion is provided at an angle toward the protruding portion with respect to the second surface. characterized in that 6. The battery end cap of claim 5.

8. The transition portion has a fifth surface and a sixth surface that are provided on opposite sides of each other, a shortest distance from the fifth surface to the sixth surface in a direction perpendicular to the inclination of the transition portion is a second distance; The ratio of the second distance to the thickness of the cap plate is equal to or greater than 0.3 and equal to or less than 0.

9. characterized in that 8. The battery end cap of claim 7.

9. a receiving area between the connecting plate and the opening of the second groove, the receiving area being used to receive a tab on a cell after it has been folded, and the depth of the receiving area in the first direction being at least twice the thickness of the tab after it has been folded; characterized in that 3. The battery end cap of claim 1 or 2.

10. the lower insulating member includes a first structure that is the first protrusion and a second structure, the second structure is connected to an outer edge of the first ridge, and the second structure forms the second groove with the first structure; The wall surface of the first structure facing the connecting plate is the bottom wall of the second groove. characterized in that 3. The battery end cap of claim 1 or 2.

11. the second structure has a maximum thickness in the first direction of a third distance; The third distance is equal to or greater than 2 mm and equal to or less than 5 mm. characterized in that 11. The battery end cap of claim 10.

12. A first gap is formed between an end of the first structure opposite to the connecting plate and a side wall of the first groove. characterized in that 12. The battery end cap of claim 11.

13. There is a second gap between the connecting plate and the sidewall of the second groove. characterized in that 3. The battery end cap of claim 1 or 2.

14. A cell and A battery end cap according to any one of claims 1 to 13. Contains characterized in that Battery.

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