Battery end cover and battery

Abstract

The utility model provides a battery end cover and a battery, and relates to the technical field of batteries, a first groove is arranged on at least partial area of a first surface of a cover plate, a first bulge is arranged on at least partial area of a third surface of a lower insulating part, the first bulge is accommodated in the first groove, a second groove is arranged on a part, corresponding to the first bulge, of a fourth surface, and the second bulge is accommodated in the second groove. In the first direction, the bottom of the second groove is higher than the lowest position of the cover plate, the end, opposite to the connecting plate, of the electrode terminal penetrates through the lower insulating part and the cover plate and extends to the second face, and the connecting plate is arranged in the second groove and abuts against the bottom wall of the second groove. According to the battery end cover provided by the invention, the space occupation of the lower insulating part and the connecting plate in the shell of the battery can be reduced, so that the volume and the capacity of the battery core in the shell can be improved, and the capacity of the battery is further improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery end cover and a battery. Background Art

[0002] As society's awareness of energy conservation and environmental protection continues to increase, new energy vehicles have been vigorously developed. Electric vehicles are one of the many types of new energy vehicles. Electric vehicles mainly use batteries to provide kinetic energy to drive the vehicle.

[0003] For electric vehicles, their range is directly related to the battery. The greater the energy density or capacity of the battery, the more power a single battery can provide, which is more conducive to improving the range of electric vehicles.

[0004] However, the volume of the battery cells that can be accommodated in the battery in the above-mentioned related art is relatively small, resulting in a reduction in the capacity of the battery and reducing the electrical energy that can be provided by the battery. Utility Model Content

[0005] The embodiments of the present application provide a battery end cover and a battery, which are used to solve the technical problem in the above-mentioned related art that the volume of the battery cells that can be accommodated by the battery is small, resulting in a reduction in the capacity of the battery and a reduction in the electrical energy that the battery can provide.

[0006] In order to achieve the above objectives, the embodiments of the present application provide the following technical solutions:

[0007] A first aspect of an embodiment of the present application provides a battery end cover, comprising:

[0008] A cover plate, the cover plate comprising a first surface and a second surface arranged opposite to each other in a thickness direction, wherein a first groove is arranged on at least a part of the area of ​​the first surface;

[0009] A lower insulating member, the lower insulating member comprising a third surface and a fourth surface arranged opposite to each other along the thickness direction, a first protrusion being arranged on at least a portion of the third surface, the third surface being a side of the lower insulating member close to the first surface, and the first protrusion being accommodated in the first groove;

[0010] A second groove is provided on a portion of the fourth surface corresponding to the first protrusion;

[0011] Along the first direction, the bottom of the second groove is higher than the lowest position of the cover plate, and the first direction is the direction from the fourth surface to the third surface.

[0012] The electrode lead-out member includes a connecting plate and an electrode terminal connected to each other, wherein one end of the electrode terminal facing away from the connecting plate passes through the lower insulating member and the cover plate and extends to the second surface, and the connecting plate is arranged in the second groove and abuts against the bottom wall of the second groove.

[0013] In a possible implementation manner, a protrusion height of the first protrusion is less than or equal to a recessed depth of the first groove.

[0014] In a possible implementation manner, a thickness of the lower insulating member at the first protrusion is less than or equal to a depth of the first groove.

[0015] In a possible implementation manner, a thickness of the first protrusion is smaller than a depth of the first groove, and a side of the first protrusion close to the first surface abuts against a bottom of the first groove.

[0016] In a possible implementation manner, a second protrusion is provided at a portion of the second surface corresponding to the first groove;

[0017] The thickness of the second protrusion is equal to the thickness of the cover plate.

[0018] In a possible implementation, along the thickness direction of the cover plate, the distance from the outer surface of the second protrusion to the second surface is a first distance;

[0019] A ratio of the first distance to the thickness of the cover plate is greater than or equal to 0.1 and less than or equal to 0.8.

[0020] In a possible implementation, the second protrusion includes:

[0021] convex part;

[0022] a transition portion, one end of which is connected to the second surface of the cover plate, and the other end of which is connected to the raised portion;

[0023] The transition portion is arranged inclined relative to the second surface toward the protruding portion.

[0024] In a possible implementation, the transition portion has a fifth surface and a sixth surface that are arranged opposite to each other;

[0025] In the inclined direction perpendicular to the transition portion, the shortest distance from the fifth surface to the sixth surface is the second distance;

[0026] A ratio of the second distance to the thickness of the cover plate is greater than or equal to 0.3 and less than or equal to 0.9.

[0027] In a possible implementation, there is an accommodating area between the connecting plate and the opening of the second groove, and the accommodating area is used to accommodate the folded pole ear on the battery cell, and the depth of the accommodating area in the first direction is at least twice the thickness of the folded pole ear.

[0028] In a possible implementation, the lower insulating member includes:

[0029] The first structure is the first protrusion;

[0030] a second structure, wherein the second structure is connected to an outer edge of the first protrusion, and the second structure and the first structure form a second groove;

[0031] The wall surface of the first structure facing the connecting plate is the bottom wall of the second groove.

[0032] In a possible implementation manner, a maximum thickness of the second structure in the first direction is a third distance, and the third distance is greater than or equal to 2 mm and less than or equal to 5 mm.

[0033] In a possible implementation manner, in the first direction, the thickness of the first structure is smaller than the depth of the first groove, so that at least a portion of the connecting plate is located in the first groove.

[0034] In a possible implementation manner, a first gap is formed between an end of the first structure facing away from the connecting plate and a side wall of the first groove.

[0035] In a possible implementation manner, a second interval is provided between the connecting plate and a side wall of the second groove.

[0036] A second aspect of an embodiment of the present application provides a battery, which includes a battery cell and the battery end cover as described above.

[0037] The embodiment of the present application provides a battery end cover and a battery. The battery end cover is provided with a first groove on the first surface of the cover plate, and the first protrusion on the lower insulating member is provided in the first groove, so that when the cover plate is covered on the battery shell, the occupancy of the lower insulating member in the internal space of the shell is reduced, thereby ensuring that the volume of the battery shell remains unchanged and the height of the battery cell that can be accommodated in the shell is correspondingly increased, thereby increasing the volume of the battery cell and the capacity of the battery, and further increasing the electrical energy that the battery can provide.

[0038] Furthermore, by setting a second groove on the fourth surface of the lower insulating member corresponding to the first protrusion, the connecting plate of the electrode lead-out member is set in the second groove and abuts against the inner wall of the second groove, the end of the electrode terminal facing away from the connecting plate extends through the lower insulating member and the cover plate to the second surface, and in the first direction, the second groove can also be used to accommodate the folded pole ear on the battery cell connected to the connecting plate, thereby further reducing the occupation of the pole ear on the internal space of the battery shell, thereby ensuring that the volume of the battery shell remains unchanged, further increasing the height of the battery cell that can be accommodated in the shell, and further increasing the volume of the battery cell and the capacity of the battery, thereby increasing the electrical energy that the battery can provide. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 An exploded view of a battery end cover provided in an embodiment of the present application;

[0041] Figure 2 A schematic structural diagram of a battery end cover from another angle provided in an embodiment of the present application;

[0042] Figure 3 for Figure 2 A cross-sectional view of the battery end cap at AA;

[0043] Figure 4 for Figure 3 Local schematic diagram at M in .

[0044] Description of reference numerals:

[0045] 100-cover plate;

[0046] 110 - first surface; 120 - second surface; 130 - first groove; 140 - second protrusion;

[0047] 141-protrusion; 142-transition portion; 143-fifth surface; 144-sixth surface;

[0048] 200-lower insulation;

[0049] 210 - third surface; 220 - fourth surface; 230 - first protrusion; 240 - second groove;

[0050] 250-first structure; 260-second structure; 270-first interval;

[0051] 241-accommodation area;

[0052] 300-electrode lead-out piece;

[0053] 310 - connection plate; 320 - electrode terminal; 330 - second spacer. DETAILED DESCRIPTION

[0054] As described in the background art, the battery in the prior art can accommodate a smaller volume of cells, which results in a reduced capacity of the battery and reduces the electrical energy that the battery can provide.

[0055] The reason for this problem is that during the assembly process of the battery in the prior art, the lower insulating part will be installed in the battery shell. When the height of the shell remains unchanged, the more the lower insulating part extends into the shell in the height direction, the more space in the shell in the height direction is occupied by the lower insulating part, and the height of the battery cell that can be accommodated in the corresponding shell is lower, thereby affecting the smaller volume of the battery cell that can be accommodated in the battery shell, thereby reducing the capacity of the battery and reducing the electrical energy that the battery can provide.

[0056] In response to the above technical problems, an embodiment of the present application provides a battery end cover and a battery. The battery end cover is provided with a first groove on the first surface of the cover plate, and the first protrusion on the lower insulating member is provided in the first groove, so that when the cover plate is covered on the battery shell, the occupancy of the lower insulating member in the internal space of the shell is reduced, thereby ensuring that the volume of the battery shell remains unchanged. The height of the battery cell that can be accommodated in the shell is correspondingly increased, thereby increasing the volume of the battery cell and the capacity of the battery, and further increasing the electrical energy that the battery can provide.

[0057] Furthermore, by setting a second groove on the fourth surface of the lower insulating member corresponding to the first protrusion, the connecting plate of the electrode lead-out member is set in the second groove and abuts against the inner wall of the second groove, the end of the electrode terminal facing away from the connecting plate extends through the lower insulating member and the cover plate to the second surface, and in the first direction, the second groove can also be used to accommodate the folded pole ear on the battery cell connected to the connecting plate, thereby further reducing the occupation of the pole ear on the internal space of the battery shell, thereby ensuring that the volume of the battery shell remains unchanged, further increasing the height of the battery cell that can be accommodated in the shell, and further increasing the volume of the battery cell and the capacity of the battery, thereby increasing the electrical energy that the battery can provide.

[0058] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of this application.

[0059] refer to Figure 1 The present application provides a battery end cover, which may include a cover plate 100, a lower insulating member 200 and an electrode lead-out member 300. The cover plate 100 may be a metal plate, and the connecting plate 310 may also be a metal plate. The battery cover plate 100 is used to be connected to the battery housing to seal the battery cell in the housing.

[0060] The battery cell is arranged in the shell, and the battery cell includes a battery cell body, an outer diaphragm and a tab. The outer diaphragm is sleeved on the outer peripheral side of the battery cell body, and the tab is arranged at one end of the battery cell body in the height direction facing the shell opening, and the tab is a tab in a folded state. During the battery assembly process, the tab is used to connect with the electrode lead-out member 300.

[0061] refer to Figure 1 and Figure 2 The electrode lead-out member 300 may be a positive electrode lead-out member 300, or may be a negative electrode lead-out member 300. The battery end cap may have both a positive electrode lead-out member 300 and a negative electrode lead-out member 300.

[0062] 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 an integrally formed structure, or may be connected by welding. The connection plate 310 is used to electrically connect to the tab on the battery body.

[0063] refer to Figure 1 and Figure 3 The cover plate 100 may include a first surface 110 and a second surface 120 that are opposite to each other in a thickness direction.

[0064] When connected to the 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 cover plate 100 has a first groove 130, and the notch of the first groove 130 is opened along the thickness. When the cover plate 100 is covered on the housing, the notch of the first groove 130 can face the inside of the housing.

[0065] refer to Figure 3 The lower insulating member 200 includes a third surface 210 and a fourth surface 220 that are arranged opposite to each other in the thickness direction. A first protrusion 230 is arranged on at least a part of the third surface 210. The third surface 210 is a side of the lower insulating member 200 close to the first surface 110. The first protrusion 230 is accommodated in the first groove 130. It can be understood that the first protrusion 230 can be connected to the bottom wall of the first groove 130, and the connection here can be abutment, or adhesion, or connection through a connecting member.

[0066] In this way, the battery end cover is provided with a first groove 130 on the first surface 110 of the cover plate 100, and the first protrusion 230 on the lower insulating member 200 is provided in the first groove 130, so that when the cover plate 100 is covered on the battery shell, the occupation of the lower insulating member 200 in the internal space of the shell is reduced, thereby ensuring that the volume of the battery shell remains unchanged. The height of the battery cell that can be accommodated in the shell is correspondingly increased, thereby increasing the volume of the battery cell and the capacity of the battery, and further increasing the electrical energy that the battery can provide.

[0067] refer to Figure 3 and Figure 4 , a portion of the fourth surface 220 of the lower insulating member 200 corresponding to the first protrusion 230 is provided with a second groove 240. Figure 3 The bottom of the second groove 240 is higher than the lowest position of the cover plate 100, and the first direction is the direction from the fourth surface 220 to the third surface 210. The end of the electrode terminal 320 facing away from the connecting plate 310 passes through the lower insulating member 200 and the cover plate 100 and extends to the second surface 120. The connecting plate 310 is disposed in the second groove 240 and abuts against the bottom wall of the second groove 240.

[0068] 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 cover plate 100, electrical connection between the connecting plate 310 and the cover plate 100 can be avoided, thereby achieving insulation isolation between the connecting plate 310 and the cover plate 100.

[0069] Furthermore, by making the bottom of the second groove 240 higher than the lowest position of the cover plate 100 along the first direction, a portion of the connecting plate 310 along the thickness direction can be located in the first groove 130, and at least a portion of the connecting plate 310 can be located in the cover plate 100, thereby reducing the space occupied by the connecting plate 310 in the internal space of the shell. While the volume of the shell remains unchanged, the volume of the battery cell that can be accommodated in the shell is increased, thereby increasing the capacity of a single battery.

[0070] refer to Figure 3 and Figure 4 In some embodiments, the thickness of the lower insulating member 200 at the first protrusion 230 is less than or equal to the depth of the first groove 130 .

[0071] refer to Figure 3 and Figure 4 In some embodiments, the thickness of the first protrusion 230 is less than the depth of the first groove 130 , and the side of the first protrusion 230 close to the first surface 110 abuts against the bottom of the first groove 130 , so that at least a portion of the connecting plate 310 is located in the first groove 130 .

[0072] It can be understood that in the first direction, while the first protrusion 230 is located in the first groove 130 , at least a portion of the connecting plate 310 can also be located in the first groove 130 .

[0073] For example, in the thickness direction of the cover 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 130 .

[0074] In this way, while a portion of the lower insulating member 200 is located in the first groove 130 , at least a portion of the connecting plate 310 is further disposed in the first groove 130 , so that the connecting plate 310 can be further away from the inner space of the housing.

[0075] In some embodiments, the connecting plate 310 can be used to electrically connect to the folded tabs on the battery cell.

[0076] Therefore, if the thickness of the connecting plate 310 is smaller than the depth of the second groove 240, the pole ear electrically connected to the connecting plate 310 can also be at least partially or completely accommodated in the second groove 240. By accommodating the pole ear in the second groove 240, the occupancy of the pole ear in the internal space of the shell can be reduced, thereby increasing the capacity of the battery cell in the shell, thereby increasing the capacity of the battery while keeping the volume of the shell unchanged.

[0077] refer to Figure 3 and Figure 4 In some embodiments, in the first direction, there is a receiving area 241 between the connecting plate 310 and the notch of the second groove 240, and the opening of the receiving area 241 can be the opening of the second groove 240, and the receiving area 241 is used to accommodate the folded tab. When the battery end cover is covered on the shell, the opening of the receiving area 241 faces the inside of the shell and is used to accommodate the tab on the battery cell.

[0078] It can be understood that the accommodating area 241 can at least accommodate a portion of the folded pole ear in the first direction, for example, the accommodating area 241 can accommodate all the folded pole ears in the first direction, thereby reducing the occupancy of the pole ears in the internal space of the shell, and increasing the volume of the battery that can be accommodated in the shell while keeping the internal space of the shell unchanged, thereby increasing the capacity of the battery.

[0079] In a specific implementation, the depth of the accommodation area 241 in the first direction is at least twice the thickness of the folded tab.

[0080] It can be understood that if the depth of the accommodating area 241 in the first direction can be twice the thickness of the folded pole ear, the pole ear of the battery cell can be completely accommodated in the accommodating area 241, and the pole ear can be avoided from occupying the internal space of the shell. On the basis of not changing the height of the shell, the shell can accommodate a higher-sized battery cell, thereby increasing the capacity of the battery and the electrical energy that the battery can provide.

[0081] refer to Figure 3 and Figure 4 In some embodiments, a portion of the second surface 120 corresponding to the first groove 130 is provided with a second protrusion 140 , and a thickness of the second protrusion 140 is equal to a thickness of the cover plate 100 .

[0082] In this way, by making the thickness of the second protrusion 140 equal to the thickness of the cover plate 100, it is possible to ensure that the thickness of the cover plate 100 remains almost unchanged, thereby avoiding the strength of the cover plate 100 in the area where the first groove 130 is located on the cover plate 100 being reduced due to thinning, thereby improving the overall strength of the battery end cover.

[0083] refer to Figure 3 and Figure 4 In some embodiments, the first groove 130 can be formed by stamping the cover plate 100. The first surface 110 of the cover plate 100 is stamped to form a stamped groove as the first groove 130, and 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 cover plate 100.

[0084] In this way, by forming the first groove 130 by stamping, the thickness of the stamped area on the cover plate 100 can be approximately equal to the thickness of the unstamped area on the cover plate 100, thereby ensuring that the thickness of the cover plate 100 remains almost unchanged. Compared with the method of opening the first groove 130 on the first surface 110 of the cover plate 100 by thinning, it is possible to avoid that the strength of the cover plate 100 in the area where the first groove 130 is located on the cover plate 100 is reduced due to thinning, thereby improving the overall strength of the battery end cover.

[0085] refer to Figure 3 and Figure 4 In some embodiments, in the first direction, along the thickness direction of the cover plate 100, the distance from the outer surface of the second protrusion 140 to the second surface 120 is a first distance (eg Figure 4 The ratio of the first distance to the thickness of the cover plate 100 is greater than or equal to 0.1 and less than or equal to 0.8.

[0086] In some embodiments, if the thickness of the cover plate 100 is 2 mm, the first distance may be 0.2 mm, 0.4 mm, 1.1 mm, or 1.6 mm.

[0087] In this way, by setting the ratio of the first distance to the thickness of the cover plate 100 to be less than or equal to 0.8, it is possible to avoid the difficulty in manufacturing the first groove 130 due to too large a ratio, and it is possible to avoid the thickness of the connection between the first groove 130 and the cover plate 100 being too thin due to the depth of the first groove 130 being too large, thereby reducing the strength of the cover plate 100.

[0088] Furthermore, if the first groove 130 is a stamped groove, by setting the ratio of the first distance to the thickness of the cover plate 100 to be greater than or equal to 0.1, it is possible to avoid the situation where the depth of the first groove 130 is too small to accommodate the lower insulating part 200 due to the fluidity of the metal due to the ratio being too small, thereby reducing the space occupied by the lower insulating part 200 in the shell.

[0089] refer to Figure 3 and Figure 4 In some embodiments, the second protrusion 140 may include a protrusion portion 141 and a transition portion 142 .

[0090] One end of the transition portion 142 is connected to the second surface 120 of the cover plate 100, and the other end of the transition portion 142 is connected to the protrusion 141. The transition portion 142 can be used to connect the cover plate 100 and the top of the second protrusion 140. The transition portion 142 is inclined relative to the second surface 120 toward the protrusion 141.

[0091] In this way, if the first groove 130 is a stamping groove and the second protrusion 140 is a stamping protrusion, compared with the arrangement of the transition portion 142 perpendicular to the second surface 120, the stamping accuracy can be reduced and the processing efficiency of the stamping groove can be improved.

[0092] refer to Figure 3 and Figure 4 In some embodiments, the transition portion 142 has a fifth surface 143 and a sixth surface 144 that are oppositely disposed.

[0093] In the inclined direction perpendicular to the transition portion 142, the shortest distance from the fifth surface 143 to the sixth surface 144 is the second distance (eg Figure 4 As shown in the distance L2 in FIG. 1 ), the ratio of the second distance to the thickness of the cover plate 100 is greater than or equal to 0.3 and less than or equal to 0.9.

[0094] In some embodiments, if the thickness of the cover 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.

[0095] In this way, by making the ratio of the second distance to the thickness of the cover plate 100 greater than or equal to 0.3, the problem of the transition part 142 being too thin due to the second distance being too small can be avoided, thereby avoiding the problem of the transition part 142 being broken due to the thickness being too thin, thereby improving the stability of the structure.

[0096] Furthermore, by making the ratio of the second distance to the thickness of the cover plate 100 less than or equal to 0.9, it is possible to avoid the problem that the transition portion 142 cannot be formed due to the fluidity of the metal due to the second distance being too large.

[0097] refer to Figure 3 and Figure 4 In some embodiments, the protrusion height of the first protrusion 230 is less than or equal to the recessed depth of the first groove 130 .

[0098] In this way, by making the height of the first protrusion 230 less than or equal to the depression depth of the first groove 130, the first protrusion 230 can be completely accommodated in the first groove 130, avoiding the generation of a gap between the third surface 210 of the lower insulating member 200 and the first surface 110 of the cover plate 100, thereby improving the connection stability between the lower insulating member 200 and the cover plate 100 and reducing the space occupied by the lower insulating member 200 in the shell.

[0099] refer to Figure 3 and Figure 4 In some embodiments, the lower insulator 200 may include a first structure 250 and a second structure 260 .

[0100] The first structure 250 is located in the first groove 130 and 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 from the cover plate 100 . The first structure 250 may be a first protrusion 230 .

[0101] The second structure 260 can be connected to the outer edge of the first protrusion 230 so that the second structure 260 and the first structure 250 form a 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, and the wall surface of the second structure 260 facing the connecting plate 310 can be a partial side wall of the second groove 240.

[0102] In this way, by positioning the first structure 250 of the lower insulating member 200 in the first groove 130, part of the structure of the lower insulating member 200 can be disposed inside the cover plate 100, thereby reducing the space occupied by the overall structure of the lower insulating member 200 inside the shell, and further enabling the shell to accommodate higher-sized battery cells without changing its height, thereby increasing the capacity of the battery.

[0103] refer to Figure 3 and Figure 4 In some embodiments, the maximum thickness of the second structure 260 in the first direction is a third distance (eg Figure 4 As shown in the distance L3 in FIG, the third distance is greater than or equal to 2 mm and less than or equal to 5 mm.

[0104] In some embodiments, the third distance may be 2 mm, 3 mm, 4 mm, or 4.5 mm.

[0105] Thus, by making the third distance greater than or equal to 2 mm, the connection stability with the outer diaphragm can be prevented from being affected by the thickness of the second structure 260 being too small. By making the third distance less than or equal to 5 mm, the space occupied by the second structure 260 inside the shell can be avoided, so that the shell can accommodate a higher-sized battery cell, thereby increasing the capacity of the battery.

[0106] refer to Figure 3 and Figure 4 In some embodiments, a first gap 270 is defined between an end of the first structure 250 facing away from the connecting plate 310 and a sidewall of the first groove 130 .

[0107] In this way, by setting a first spacer 270 between the end of the first structure 250 facing away from the connecting plate 310 and the side wall of the first groove 130, the first structure 250 of the lower insulating member 200 can be easily installed in the first groove 130, thereby improving the assembly efficiency of the lower insulating member 200 and the cover plate 100, and further improving the assembly efficiency of the battery end cover.

[0108] refer to Figure 3 and Figure 4 In some embodiments, a second gap 330 is defined between the connecting plate 310 and the sidewall of the second groove 240 .

[0109] In this way, by setting the second spacer 330 between the connecting plate 310 and the side wall of the second groove 240, the connecting plate 310 can be easily installed in the second groove 240, thereby improving the assembly efficiency of installing the connecting plate 310 in the second groove 240, and further improving the assembly efficiency of the battery end cover.

[0110] An embodiment of the present application also provides a battery, which may include a battery cell and a battery end cover as described above.

[0111] In this way, by using the above-mentioned battery end cover, the space occupied by the lower insulating member 200 inside the shell can be reduced while ensuring that the height of the battery shell remains unchanged, and the space occupied by the tabs on the battery cell inside the shell can be reduced, thereby increasing the height of the battery cell that can be accommodated inside the shell, thereby increasing the capacity of the battery and the electrical energy that the battery can provide.

[0112] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0113] It should be noted that the phrases "in specific implementation", "in some embodiments", "in this embodiment", "exemplarily" and the like mentioned in the specification indicate that the described embodiment may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing specific features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments that are explicitly or not explicitly described.

[0114] In general, terms should be understood, at least in part, by the context in which they are used. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, depending, at least in part, on the context. Similarly, terms such as "a," "an," or "the" may also be understood to convey singular usage or to convey plural usage, depending, at least in part, on the context.

[0115] It should be easily understood that “on,” “above,” and “over” in the present disclosure should be interpreted in the broadest manner, so that “on” not only means “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” not only includes the meaning of “above” or “over,” but also may include the meaning of “above” or “over something” with no intervening features or layers therebetween (i.e., directly on something).

[0116] In addition, spatially relative terms, such as "below," "below," "beneath," "above," "above," etc., may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the figures. The device may have other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein may likewise be interpreted accordingly.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these 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 application.

Claims

1. A battery end cap, characterized in that: include: A cover plate, the cover plate comprising a first surface and a second surface arranged opposite to each other in a thickness direction, wherein a first groove is arranged on at least a part of the area of ​​the first surface; A lower insulating member, the lower insulating member comprising a third surface and a fourth surface arranged opposite to each other along the thickness direction, a first protrusion being arranged on at least a portion of the third surface, the third surface being a side of the lower insulating member close to the first surface, and the first protrusion being accommodated in the first groove; A second groove is provided on a portion of the fourth surface corresponding to the first protrusion; Along a first direction, the bottom of the second groove is higher than the lowest position of the cover plate, and the first direction is the direction from the fourth surface to the third surface; The electrode lead-out member includes a connecting plate and an electrode terminal connected to each other, wherein one end of the electrode terminal facing away from the connecting plate passes through the lower insulating member and the cover plate and extends to the second surface, and the connecting plate is arranged in the second groove and abuts against the bottom wall of the second groove.

2. The battery end cover according to claim 1, characterized in that: The protrusion height of the first protrusion is less than or equal to the depression depth of the first groove.

3. The battery end cover according to claim 1, characterized in that: The thickness of the lower insulating member at the first protrusion is less than or equal to the depth of the first groove.

4. The battery end cover according to claim 3, characterized in that: The thickness of the first protrusion is smaller than the depth of the first groove, and a side of the first protrusion close to the first surface abuts against a bottom of the first groove.

5. The battery end cover according to claim 1, characterized in that: A second protrusion is provided on a portion of the second surface corresponding to the first groove; The thickness of the second protrusion is equal to the thickness of the cover plate.

6. The battery end cover according to claim 5, characterized in that: Along the thickness direction of the cover plate, the distance from the outer surface of the second protrusion to the second surface is a first distance; The ratio of the first distance to the thickness of the cover plate is greater than or equal to 0.1 and less than or equal to 0.

8.

7. The battery end cover according to claim 5, characterized in that: The second protrusion comprises: convex part; a transition portion, one end of which is connected to the second surface of the cover plate, and the other end of which is connected to the raised portion; The transition portion is arranged inclined relative to the second surface toward the protruding portion.

8. The battery end cover according to claim 7, characterized in that: The transition portion has a fifth surface and a sixth surface that are arranged opposite to each other; In the inclined direction perpendicular to the transition portion, the shortest distance from the fifth surface to the sixth surface is the second distance; The ratio of the second distance to the thickness of the cover plate is greater than or equal to 0.3 and less than or equal to 0.

9.

9. The battery end cover according to any one of claims 1 to 6, characterized in that: An accommodating area is provided between the connecting plate and the opening of the second groove, and the accommodating area is used to accommodate the folded pole lug on the battery cell. The depth of the accommodating area in the first direction is at least twice the thickness of the folded pole lug.

10. The battery end cover according to any one of claims 1 to 6, characterized in that: The lower insulating member comprises: The first structure is the first protrusion; a second structure, wherein the second structure is connected to an outer edge of the first protrusion, and the second structure and the first structure form a second groove; The wall surface of the first structure facing the connecting plate is the bottom wall of the second groove.

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

12. The battery end cover according to claim 11, characterized in that: A first gap is formed between an end of the first structure facing away from the connecting plate and a side wall of the first groove.

13. The battery end cover according to any one of claims 1 to 6, characterized in that: A second interval is defined between the connecting plate and the side wall of the second groove.

14. A battery, characterized in that: It comprises a battery cell and a battery end cover as claimed in any one of claims 1 to 13.

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