CN217468604U - Battery and cover plate thereof - Google Patents

Abstract

The utility model discloses a battery and apron thereof. The utility model discloses in, the apron of battery includes: the cover plate assembly is provided with a mounting opening; a negative post, the negative post comprising: the negative pole column body penetrates through the mounting opening and is separated from the inner wall of the mounting opening, the connecting bottom plate is electrically connected with the bottom of the negative pole column body, and the connecting bottom plate is abutted against the bottom surface of the cover plate assembly; the area of the top surface of the negative pole column body is larger than that of the mounting opening, and the mounting opening is covered by the top surface of the negative pole column body; the connecting bottom plate is used for connecting tabs of battery cells in the battery monomer; and the bottom sealing ring is sleeved on the periphery of the negative pole column body and is used for sealing and connecting a gap between the bottom plate and the cover plate assembly. Compared with the prior art, the energy density of the battery is improved, the process is simple, the potential safety hazard is reduced, and in addition, the electrolyte cannot permeate into the negative pole column to corrode the negative pole column.

Description

Battery and cover plate thereof

Technical Field

The utility model relates to a battery technology field, in particular to battery and apron thereof.

Background

The power battery apron of volume production has a majority to account for than for riveting utmost point post apron in the existing market, and the constitution of this kind of riveting utmost point post mainly passes through, and utmost point post and riveting cooperation centre gripping of riveting piece aluminium pig are fixed on the apron, through utmost point post bottom reconnection switching piece, and the switching piece links to each other with the utmost point ear of electric core.

The riveting cooperation of present riveted structure mainly leaning on utmost point post and riveting aluminium pig, this height that has just restricted utmost point post, because the riveting aluminium pig of cooperation is in the outside of electric core, on the one hand will bear the tensile machine torsion of aluminium bar all directions, on the other hand still guarantees riveting intensity with utmost point post, in order to guarantee the compression of sealing washer, so in order to guarantee like the above performance, riveting pig's height is difficult to the lower of doing, and then leads to electric core can't increase the casing and remove the promotion energy density, the high space of module has also been restricted simultaneously. In addition, the tab and the adapter sheet are welded in the battery, the adapter sheet and the pole are welded again, the process is complex, more welding slag is easily generated by multiple times of welding, the treatment is troublesome, and the potential safety hazard is more.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a battery and apron thereof for improve the energy density of battery, and simple process reduces the potential safety hazard, and electrolyte can not permeate the negative pole post in the negative pole post yet and corrodes the negative pole post.

In order to solve the above technical problem, an embodiment of the present invention provides a cover plate for a battery, including:

a cover plate assembly having a mounting opening;

a negative post, the negative post comprising: the negative pole column body penetrates through the mounting opening and is separated from the inner wall of the mounting opening, the connecting bottom plate is electrically connected with the bottom of the negative pole column body, and the connecting bottom plate is abutted against the bottom surface of the cover plate assembly; the area of the top surface of the negative pole column body is larger than that of the mounting opening, and the top surface of the negative pole column body covers the mounting opening; the connecting bottom plate is used for connecting tabs of battery cells in the battery monomer; and the number of the first and second groups,

and the bottom sealing ring is sleeved on the periphery of the negative pole column body and used for sealing a gap between the connecting bottom plate and the cover plate assembly.

The utility model discloses embodiment is for prior art, during the negative pole post body can be inserted the installing port by last under, and negative pole post body top surface area is greater than the installing port to the top surface of negative pole post body can lap subassembly upper surface and support. The top surface of negative pole post body can link together with the connecting bottom plate again, connecting bottom plate and apron subassembly offset, thereby realize that the installation of negative pole post body is fixed on the apron subassembly, and the top surface of negative pole post body can need not through riveting piece welded fastening, the outer utmost point post body outside the top surface of apron subassembly also need not to be thick for the cooperation riveting piece, can reduce the height of negative pole post body, thereby compare with the battery of present battery co-altitude, the inner space of the battery in this embodiment can be higher, inside holding capacity is bigger, can promote energy density, the outside riveting piece has also been saved. In addition, because the setting of connecting the bottom plate, utmost point ear can with be connected the bottom plate welding, realizes the electric conduction between utmost point ear and the negative pole post body, can save in the current battery in order to connect the switching piece of utmost point post and utmost point ear, need not to drag utmost point ear twice when switching piece and utmost point ear welding and will switching piece weld utmost point post on, more simple and convenient on the mounting process, reduce the influence of welding slag to battery inside, reduce the potential safety hazard. Meanwhile, a bottom sealing ring is arranged in a gap between the bottom sealing ring and the cover plate assembly, so that electrolyte cannot enter the mounting port between the bottom sealing ring and the cover plate assembly to corrode the cathode column body, and the service life of the cathode column body is guaranteed.

In one embodiment, the cover plate assembly includes:

the cover plate assembly is provided with the mounting port; the bottom sealing ring is used for sealing a gap between the connecting bottom plate and the cover plate body; and the number of the first and second groups,

the top sealing ring is sleeved on the periphery of the negative pole column body and arranged on the top surface of the cover plate body; the top sealing ring is used for sealing a gap between the negative pole column body and the cover plate body.

In one embodiment, the negative pole body is provided with a first metal material cylinder and a second metal material cylinder which are connected up and down, and the hardness of the first metal material cylinder is smaller than that of the second metal material cylinder; the connecting surface of the first metal material cylinder and the second metal material cylinder is not higher than the upper surface of the top sealing ring, and the connecting surface of the first metal material cylinder and the second metal material cylinder is not lower than the upper surface of the bottom sealing ring; the first metal material cylinder and the second metal material cylinder are connected through friction welding.

In one embodiment, the first metallic material pillars have a height in the range of 1.5mm to 5mm and the second metallic material pillars have a height in the range of 1mm to 8 mm.

In an embodiment, the top sealing ring has an extended sealing portion extending into the mounting opening, and the extended sealing portion abuts against between an inner wall of the mounting opening and the negative pole column body.

In one embodiment, the cover plate assembly includes:

the cover plate body is provided with the mounting opening; and the number of the first and second groups,

the lower plastic part and the bottom sealing ring are pressed between the cover plate body and the connecting bottom plate, and the lower plastic part is sleeved outside the bottom sealing ring; the lower plastic part is used for isolating the cover plate body from the connecting bottom plate, and the negative pole column body penetrates through the lower plastic part and is connected to the connecting bottom plate.

In an embodiment, the connection bottom plate is provided with a through hole for inserting the negative pole body, and the bottom surface of the negative pole body is located in the through hole.

In one embodiment, the distance from the bottom surface of the negative electrode pillar body to the bottom surface of the connection bottom plate is in a range of 0mm to 1 mm.

In one embodiment, the negative pole column body is provided with a top sealing surface column and a connecting column which are connected up and down, the bottom sealing ring is sleeved on the connecting column, and the connecting column penetrates through the lower plastic part and is connected to the connecting bottom plate; the top cover column covers the connecting column, and the area of the top cover column is larger than that of the connecting column; the thickness range of the top cover column is 1.5mm-5 mm.

In one embodiment, the connecting column has a first column part and a second column part which are connected up and down; the diameter of the second cylinder part is larger than that of the first cylinder part, and the bottom sealing ring is sleeved outside the first cylinder part;

the through hole is provided with a first hole body and a second hole body which are communicated up and down, and the aperture of the second hole body is larger than that of the first hole body; wherein the first post portion is at least partially inserted into the first aperture and the second post portion is at least partially inserted into the second aperture.

In an embodiment, the through hole further has a third hole body located below the second hole body and communicated with the second hole body, and a diameter of the third hole body is larger than a diameter of the second hole body.

In one embodiment, the first and second column portions are coaxially disposed; the first hole body, the second hole body and the third hole body are coaxially arranged.

In an embodiment, the second column portion is riveted to the connecting bottom plate, the second column portion has a riveting portion embedded in the second hole and riveted to the connecting bottom plate, and the riveting portion is at least partially welded to the connecting bottom plate.

In one embodiment, the cover plate assembly further comprises: the upper plastic part is arranged on the top surface of the cover plate body and sleeved outside the negative pole column body;

the top surface of apron body has and is used for go up plastic part embedding first heavy platform, go up to offer on the plastic part and be used for at least part the second heavy platform of top seal post embedding.

In one embodiment, the first sinking platform is rectangular, and the upper plastic part is of a rectangular structure matched with the first sinking platform; the second sinking platform is rectangular, and the part of the top sealing surface column embedded into the second sinking platform is of a rectangular structure.

In one embodiment, the top cover column has a first cover column and a second cover column which are connected up and down, and the area of the first cover column is larger than that of the second cover column; wherein, the second cover cylinder imbeds in the second sinks in the platform, first cover cylinder covers the upper surface of going up the plastic part.

In one embodiment, the top surface of the negative post has a smaller area than the bottom surface of the negative post.

The utility model discloses still relate to a battery in another embodiment, include:

an electric core;

the battery cell is placed in the shell, and an opening is formed in the top of the shell; and the number of the first and second groups,

a cover plate as claimed in any one of the preceding claims for closing the opening of the housing.

In one embodiment, the connection base plate has a butt-joint region in butt joint with the negative pole column body and an outer-rubbing region outside the butt-joint region, and the region where the tab is connected with the connection base plate is at least partially located in the outer-rubbing region.

In one embodiment, the areas where the tabs are joined to the connection base plate are located within the outer zone of friction.

In one embodiment, the tab comprises a plurality of layers of electrode lead-outs, each of which is stacked and welded to form a tab weld area on the tab;

the position of the axis of the negative pole column body on the connecting bottom plate is a first position, the center of the tab welding area is a second position and is positioned on one side, far away from the center of the cover plate assembly, of the connecting bottom plate, and the second position is positioned on one side, close to the center of the cover plate assembly, of the connecting bottom plate;

the first and second positions are non-collinear along a length of the cover plate assembly.

In one embodiment, the tab welding area is an elongated pole welding area, and the elongated pole welding area extends along the length direction of the cover plate assembly;

the length of the elongated pole welding area is a, and the vertical distance between the first position and the second position along the extension line of the width direction of the cover plate assembly is greater than or equal to 0.5 a.

Drawings

Fig. 1 is an exploded view of a cover plate according to an embodiment of the present invention;

fig. 2 is a cross-sectional view of a cover plate according to an embodiment of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 2;

fig. 4 is a schematic structural diagram of a negative electrode pillar body according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a connection base plate according to an embodiment of the present invention;

fig. 6 is a bottom view of a cover plate according to an embodiment of the present invention;

wherein, 100, a cover plate; 1. a cover plate assembly; 11. a cover plate body; 110. a first sinking platform; 12. a top seal ring; 121. an extension seal portion; 13. applying a plastic part; 130. a second sinking platform; 14. a plastic part is put; 10. an installation port; 15. a bottom seal ring; 2. a connecting surface; 3. a negative pole column body; 31. a top seal post; 311. a first cover cylinder; 312. a second cover cylinder; 32. connecting columns; 321. a first cylindrical portion; 322. a second column part; 320. riveting parts; 4. connecting the bottom plate; 51. a docking area; 52. an external area of development; 6. a through hole; 61. a first aperture body; 62. a second aperture body; 63. a third porous body; 7. a tab; 71. and a tab welding area.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the following will explain in detail each embodiment of the present invention with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that in various embodiments of the invention, numerous technical details are set forth in order to provide a better understanding of the present application. However, the technical solutions claimed in the claims of the present application can be implemented without these technical details and with various changes and modifications based on the following embodiments.

Throughout the specification and claims, the word "comprise" and variations thereof, such as "comprises" and "comprising," are to be understood as an open, inclusive meaning, i.e., as being interpreted to mean "including, but not limited to," unless the context requires otherwise.

Various embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended as limitations on the scope of the invention, but are merely illustrative of the true spirit of the technical solution of the invention.

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

As used in this specification and the appended claims, the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is generally employed in its sense including "and/or" unless the context clearly dictates otherwise.

In the following description, for the sake of clarity, the structure and operation of the present invention will be described with the aid of directional terms, but the terms "front", "rear", "left", "right", "outer", "inner", "outer", "inward", "upper", "lower", etc. should be understood as words of convenience and not as words of limitation.

Embodiments of the present invention are described below with reference to the drawings.

The first embodiment of the present invention relates to a cover plate 100 for a battery. As shown in fig. 1, 2, and 3, the cover plate 100 includes: apron subassembly 1 and negative pole post, apron subassembly 1 has installing port 10, and the negative pole post includes: negative electrode pillar body 3 penetrating through mounting opening 10 and spaced apart from the inner wall of mounting opening 10, and connection bottom plate 4 electrically connected to the bottom of negative electrode pillar body 3. The connecting bottom plate 4 is abutted against the bottom surface of the cover plate assembly 1, and the connecting bottom plate 4 is used for connecting the tabs of the battery cells in the battery cells. The area of the top surface of the negative pole column body 3 is larger than that of the mounting opening 10, and the top surface of the negative pole column body 3 covers the mounting opening 10. And the connecting bottom plate 4 is a metal bottom plate and can be connected with the negative pole column through riveting or welding.

As shown in fig. 1, 2 and 3, when the terminal is mounted on the cover plate assembly 1, the negative terminal body 3 can be inserted into the mounting opening 10 from top to bottom, and the area of the top surface of the negative terminal body 3 is larger than that of the mounting opening 10, so that the top surface of the terminal body can abut against the upper surface of the cover plate assembly 1. The top surface of negative pole post body 3 can link together with connecting bottom plate 4 again, connecting bottom plate 4 offsets with apron subassembly 1, thereby realize that the installation of negative pole post body 3 is fixed on apron subassembly 1, and the top surface of negative pole post body 3 can need not to be through riveting piece welded fastening, the negative pole post body 3 outside the top surface of apron subassembly 1 also need not to do thickly for the cooperation riveting piece, can reduce the height of negative pole post body 3, thereby compare with the battery of present battery same height, the inner space of the battery in this embodiment can be higher, inside holding capacity is bigger, can promote energy density, outside riveting piece has also been saved. In addition, because the setting of connecting bottom plate 4, utmost point ear can with connecting bottom plate 4 welding, realizes the electric conduction between utmost point ear and the negative pole post body 3, can save in the current battery in order to connect the switching piece of utmost point post and utmost point ear, need not to drag utmost point ear twice when switching piece and utmost point ear welding and will switching piece weld to utmost point post on, more simple and convenient on the mounting process, reduce the influence of welding slag to the battery is inside, reduces the potential safety hazard. Meanwhile, the bottom sealing ring 15 is arranged to be hermetically connected with the gap between the bottom plate 4 and the cover plate assembly 1, so that the electrolyte cannot enter the mounting hole 10 from the space between the bottom plate 4 and the cover plate assembly 1 to corrode the negative pole column body 3, and the service life of the negative pole column body 3 is guaranteed.

The following description will specifically describe the implementation details of the present embodiment, and the following description is provided only for the convenience of understanding and is not necessary for implementing the present embodiment.

Further, as shown in fig. 1, 2, 3 and 4, the cap assembly 1 includes: the cover plate assembly comprises a cover plate body 11 and a top sealing ring 12, wherein a mounting opening 10 is formed in the cover plate assembly 1, and a bottom sealing ring 15 is used for sealing and connecting a gap between the bottom plate 4 and the cover plate body 11. The top sealing ring 12 is sleeved on the periphery of the negative pole column body 3 and arranged on the top surface of the cover plate body 11, and the top sealing ring 12 is used for sealing a gap between the negative pole column body 3 and the cover plate body 11. The cathode post body 3 is provided with a first metal material post body and a second metal material post body which are connected up and down, and the hardness of the first metal material post body is smaller than that of the second metal material post body. The connecting surface 2 of the first metal material cylinder and the second metal material cylinder is not higher than the upper surface of the top sealing ring 12, the connecting surface 2 of the first metal material cylinder and the second metal material cylinder is not lower than the upper surface of the bottom sealing ring, and the first metal material cylinder and the second metal material cylinder are connected through friction welding. The first metal material can be aluminum material, and the second metal material can be copper material.

Further, the first metallic material pillars have a height c ranging from 1.5mm to 5mm and the second metallic material pillars have a height d ranging from 1mm to 8 mm. In some embodiments, the height c of the first metallic material pillars may be within a range of intervals of any two of 1.7mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, or 4.5 mm. The height d of the second metallic material cylinder may be within the range of an interval of any two of 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, or 7.5 mm.

More particularly, as shown in fig. 1, 2 and 3, the top sealing ring 12 has an extended sealing portion 121 extending into the mounting opening 10, and the extended sealing portion 121 is abutted between the inner wall of the mounting opening 10 and the pole body. The extended seal portion 121 seals a gap between the inner wall of the mounting opening 10 and the upper portion of the pole body inserted in the mounting opening 10, and also separates the inner wall of the mounting opening 10 and the upper portion of the pole body inserted in the mounting opening 10. It will be appreciated that in other embodiments, the extended sealing portion 121 may be absent and the top sealing ring 12 may be partially covered over the mounting opening 10 and in contact with the outer periphery of the post body.

Further, as shown in fig. 1, 2 and 3, the cover plate assembly 1 includes: the cover plate comprises a cover plate body 11 and a lower plastic part 14, wherein an installation opening 10 is formed in the cover plate body 11, the lower plastic part 14 and a bottom sealing ring 15 are pressed between the cover plate body 11 and a connecting bottom plate 4, the lower plastic part 14 is sleeved outside the bottom sealing ring 15, the lower plastic part 14 is used for isolating the cover plate body 11 and the connecting bottom plate 4, and the plastic part 14 penetrates through the negative pole column body 3 and is connected to the connecting bottom plate 4.

As shown in fig. 1, 2, and 3, the connection base plate 4 is provided with a through hole 6 into which the negative electrode tab body 3 is inserted, and the bottom surface of the negative electrode tab body 3 is positioned in the through hole 6.

Further, as shown in fig. 1, 2 and 3, the distance e from the bottom surface of the negative post body 3 to the bottom surface of the connection base plate 4 ranges from 0mm to 1 mm. In some embodiments, the distance e may be within the range of an interval of any two of 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, or 0.9 mm.

Specifically, as shown in fig. 1, 2, 3 and 5, the negative pole body 3 has a top sealing surface column 31 and a connecting column 32 connected up and down, the bottom sealing ring 15 is sleeved on the connecting column 32, and the connecting column 32 penetrates through the lower plastic part 14 and is connected to the connecting bottom plate 4. And top seal post 31 covers spliced pole 32, and the area of top seal post 31 is greater than spliced pole 32's area, and the thickness f scope of top seal post 31 is 1.5mm-5 mm. In some embodiments, the thickness f of the top cover pillar 31 may be within a range of an interval of any two of 1.7mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, or 4.5 mm.

Further, as shown in fig. 1, fig. 2, fig. 3 and fig. 5, the connecting column 32 has a first column portion 321 and a second column portion 322 connected up and down, the diameter of the second column portion 322 is larger than that of the first column portion, and the bottom sealing ring 15 is sleeved outside the first column portion 321. The through hole 6 has a first hole 61 and a second hole 62 which are communicated with each other up and down, and the aperture of the second hole 62 is larger than that of the first hole 61. The first cylindrical portion 321 is at least partially inserted into the first aperture 61, and the second cylindrical portion 322 is at least partially inserted into the second aperture 62. The second post part 322 is inserted into the second hole 62, can be riveted in the second hole 62, is positioned with the connecting bottom plate 4, and then fixes the second post part 322 and the connecting bottom plate 4 in a welding manner, so that the post body is positioned on the cover plate assembly 1 through the matching of the connecting bottom plate 4 and cannot fall off from the cover plate assembly 1.

It should be noted that, as shown in fig. 1, fig. 2, fig. 3 and fig. 5, the through hole 6 further has a third hole 63 located below the second hole 62 and communicating with the second hole 62, and the diameter of the third hole 63 is larger than that of the second hole 62. Therefore, the welding mark after the second cylindrical portion 322 is welded to the connection base plate 4 can be in the third hole 63 without protruding to the bottom of the connection base plate 4, i.e. without affecting the placement of the subsequent battery cells.

Further, as shown in fig. 1, 2, 3, and 5, the first column portion 321 and the second column portion 322 are coaxially disposed, and the first hole 61, the second hole 62, and the third hole 63 are coaxially disposed. In other embodiments, the first and second column portions 321, 322 may be non-coaxially disposed and slightly off-center.

Further, as shown in fig. 1, fig. 2, fig. 3 and fig. 5, the second cylinder 322 is riveted to the connecting base plate 4, the second cylinder 322 has a riveting portion 320 embedded in the second hole 62 and riveted to the connecting base plate 4, the riveting portion 320 may be a portion of the second cylinder 322 radially protruding out of the first cylinder 321, and at least a portion of the riveting portion 320 is welded to the connecting base plate 4. Preferably, riveting portion 320 can be the annular structure that encircles for the axis circumference around utmost point post body, lets riveting portion 320 whole and connecting bottom plate 4 welding link to each other again, lets utmost point post body and connecting bottom plate 4 fixed more firm.

As shown in fig. 1, 2, and 3, the cover plate assembly 1 further includes: an upper plastic part 13 disposed on the top surface of the cover plate body 11, and the upper plastic part 13 is sleeved outside the negative pole body 3. The top surface of the cover plate body 11 has a first sunken platform 110 for the upper plastic part 13 to be embedded in, thereby determining the installation position of the upper plastic part 13, and allowing the upper plastic part 13 to be positioned within the range of the first sunken platform 110. The upper plastic part 13 is provided with a second sinking platform 130 for at least partially embedding the top sealing surface column 31, so as to determine the installation position of the top sealing surface column 31, and the top sealing surface column 31 is positioned in the range of the second sinking platform 130.

Preferably, as shown in fig. 1, 2 and 3, the first sinking platform 110 is rectangular, and the upper plastic part 13 is a rectangular structure matched with the first sinking platform 110; the second sinking platform 130 is rectangular, and the part of the top sealing column 31 embedded in the second sinking platform 130 is rectangular. The top sealing surface column 31 is positioned by the second sinking platform 130, so that the top sealing surface column 31 can not rotate relative to the upper plastic part 13, and the upper plastic part 13 can be positioned by the first sinking platform 110 and can not rotate relative to the cover plate body 11, so that the pole can be positioned and can not rotate relative to the cover plate body 11.

In other embodiments, as shown in fig. 1, 2, and 3, the first sinking platform 110 and the second sinking platform 130 are also trapezoidal or hexagonal, and the components disposed in the first sinking platform 110 and the second sinking platform 130 are also matched with the first sinking platform 110 and the second sinking platform 130 according to the modified shapes of the first sinking platform 110 and the second sinking platform 130.

Further, as shown in fig. 1, 2 and 3, the top cover cylinder 31 has a first cover cylinder 311 and a second cover cylinder 312 which are connected up and down, and the area of the first cover cylinder 311 is larger than that of the second cover cylinder 312. Wherein, the second cover cylinder 312 is embedded in the second sinking platform 130, and the first cover cylinder 311 covers the upper surface of the plastic part 13.

In addition, the area of the top surface of the negative electrode tab is smaller than the area of the bottom surface of the negative electrode tab, i.e., the area of the top surface of the negative electrode tab body 3 is smaller than the area of the connection bottom plate 4.

A second embodiment of the present invention relates to a battery. The battery includes: the battery cell is placed in the shell, the top of the shell is provided with an opening, the cover plate 100 is used for covering the opening of the shell, and the tab 7 of the battery cell is connected with the connecting bottom plate 4.

Further, as shown in fig. 6, the connection base plate 4 has an abutting region 51 abutting against the negative pole column body 3 and an outer expanded region 52 outside the abutting region 51, and the region where the tab is connected to the connection base plate 4 is at least partially located in the outer expanded region 52.

Preferably, the region in which the tab 7 engages the connection base plate 4 is located in the outer zone of enlargement 52. Therefore, the joint area of the tab 7 and the connecting base plate 4 is far away from the bottom sealing ring 15 as far as possible, and the bottom sealing ring 15 is prevented from being damaged when the tab is welded on the connecting base plate 4.

Specifically, as shown in fig. 6, the tab 7 includes a plurality of layers of electrode lead-out bodies, which are stacked and welded to form a tab land 71 on the tab. The position of the axis of the pole body 3 on the connecting bottom plate 4 is a first position p, the center of the tab welding area 71 is a second position m, the second position m is located on the connecting bottom plate 4 and is far away from the center of the cover plate assembly 1, and the second position m is located on the connecting bottom plate 4 and is close to the center of the cover plate assembly 1. The first position p and the second position m are not collinear along the length of the cover plate assembly 1. That is, the first position p is located as far away from the center of the cover plate assembly 1 as possible, and the second position may be located closer to the center of the cover plate assembly 1, which results in the first position being located as far away from the second position as possible.

Further, as shown in fig. 6, the tab welding area 71 is an elongated pole welding area extending along the length direction of the cover plate assembly 1. The length of the elongated pole welding area is a, and the perpendicular distance b from the first position p to the second position m along the extension line of the cover plate assembly 1 in the width direction may be, but is not limited to, within a range of an interval formed by any two of 0.5a, 0.6a, 0.7a, 0.8a, 0.9a and a. This results in the distance between the first and second positions being as great as possible, thereby reducing or eliminating the thermal influence on the top seal ring when the tabs are welded to the connection base plate.

While the preferred embodiments of the present invention have been described in detail above, it should be understood that aspects of the embodiments can be modified, if necessary, to employ aspects, features and concepts of the various patents, applications and publications to provide yet further embodiments.

These and other changes can be made to the embodiments in light of the above detailed description. In general, in the claims, the terms used should not be construed to be limited to the specific embodiments disclosed in the specification and the claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which such claims are entitled.

It will be understood by those skilled in the art that the foregoing embodiments are specific examples of the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in its practical application.

Claims (14)

1. A cap plate for a battery, comprising:

a cover plate assembly having a mounting opening;

a negative post, the negative post comprising: the negative pole column body penetrates through the mounting opening and is separated from the inner wall of the mounting opening, the connecting bottom plate is electrically connected with the bottom of the negative pole column body, and the connecting bottom plate is abutted against the bottom surface of the cover plate assembly; the area of the top surface of the negative pole column body is larger than that of the mounting opening, and the top surface of the negative pole column body covers the mounting opening; the connection bottom plate is used for connecting tabs of battery cells in the battery monomer; and the number of the first and second groups,

and the bottom sealing ring is sleeved on the periphery of the negative pole column body and used for sealing a gap between the connecting bottom plate and the cover plate assembly.

2. The cap plate for a battery according to claim 1, wherein the cap plate assembly comprises:

the cover plate assembly is provided with the mounting opening; the bottom sealing ring is used for sealing a gap between the connecting bottom plate and the cover plate body; and the number of the first and second groups,

the top sealing ring is sleeved on the periphery of the negative pole column body and arranged on the top surface of the cover plate body; the top sealing ring is used for sealing a gap between the negative pole column body and the cover plate body.

3. The cover plate of a battery according to claim 2, wherein the negative post body has a first metal material post and a second metal material post connected up and down, the first metal material post having a hardness less than that of the second metal material post; the connecting surface of the first metal material cylinder and the second metal material cylinder is not higher than the upper surface of the top sealing ring, and the connecting surface of the first metal material cylinder and the second metal material cylinder is not lower than the upper surface of the bottom sealing ring; the first metal material cylinder and the second metal material cylinder are connected through friction welding.

4. The cap plate for a battery according to claim 3, satisfying any one of the following (1) or (2):

(1) the height range of the first metal material cylinder is 1.5mm-5mm, and the height range of the second metal material cylinder is 1mm-8 mm;

(2) the top sealing ring is provided with an extension sealing part which is extended and embedded into the mounting opening, and the extension sealing part is abutted between the inner wall of the mounting opening and the negative pole column body.

5. The cap plate for a battery according to claim 1, wherein the cap plate assembly comprises:

the cover plate body is provided with the mounting opening; and the number of the first and second groups,

the lower plastic part and the bottom sealing ring are pressed between the cover plate body and the connecting bottom plate, and the lower plastic part is sleeved outside the bottom sealing ring; the lower plastic part is used for isolating the cover plate body from the connecting bottom plate, and the negative pole column body penetrates through the lower plastic part and is connected to the connecting bottom plate; the connecting bottom plate is provided with a through hole for inserting the negative pole column body, and the bottom surface of the negative pole column body is positioned in the through hole.

6. The cap plate for a battery according to claim 5, wherein the distance from the bottom surface of the negative post body to the bottom surface of the connection base plate is in the range of 0mm to 1 mm.

7. The cover plate for the battery according to claim 6, wherein the negative post body has a top sealing post and a connecting post which are connected up and down, the bottom sealing ring is sleeved on the connecting post, and the connecting post penetrates through the lower plastic part and is connected to the connecting bottom plate; the top cover column covers the connecting column, and the area of the top cover column is larger than that of the connecting column; the thickness range of the top cover column is 1.5mm-5 mm.

8. The cap plate for battery according to claim 7, wherein the connection post has a first post portion and a second post portion connected up and down; the diameter of the second cylinder part is larger than that of the first cylinder part, and the bottom sealing ring is sleeved outside the first cylinder part;

the through hole is provided with a first hole body and a second hole body which are communicated up and down, and the aperture of the second hole body is larger than that of the first hole body; wherein the first post portion is at least partially inserted into the first aperture and the second post portion is at least partially inserted into the second aperture.

9. The cap plate for a battery according to claim 8, satisfying any one of the following (3) to (5):

(3) the through hole is also provided with a third hole body which is positioned below the second hole body and communicated with the second hole body, and the diameter of the third hole body is larger than that of the second hole body;

(4) the through hole is also provided with a third hole body which is positioned below the second hole body and communicated with the second hole body, and the diameter of the third hole body is larger than that of the second hole body; the first column part and the second column part are coaxially arranged; the first, second and third bore bodies are coaxially disposed;

(5) the second column part is riveted with the connecting bottom plate and is provided with a riveting part which is embedded in the second hole body and is riveted with the connecting bottom plate, and at least part of the riveting part is welded with the connecting bottom plate.

10. The cap plate for a battery according to claim 7, wherein any one of the following (6) to (8) is satisfied:

(6) the cover plate assembly further includes: the upper plastic part is arranged on the top surface of the cover plate body and sleeved outside the negative pole column body; the top surface of the cover plate body is provided with a first sinking platform for embedding the upper plastic part, and the upper plastic part is provided with a second sinking platform for embedding at least part of the top sealing surface columns;

(7) the cover plate assembly further includes: the upper plastic part is arranged on the top surface of the cover plate body and sleeved outside the negative pole column body; the top surface of the cover plate body is provided with a first sinking platform for embedding the upper plastic part, and the upper plastic part is provided with a second sinking platform for embedding at least part of the top sealing surface columns; the first sinking platform is rectangular, and the upper plastic part is of a rectangular structure matched with the first sinking platform; the second sinking platform is rectangular, and the part of the top sealing surface column embedded into the second sinking platform is of a rectangular structure;

(8) the cover plate assembly further includes: the upper plastic part is arranged on the top surface of the cover plate body and sleeved outside the negative pole column body; the top surface of the cover plate body is provided with a first sinking platform for embedding the upper plastic part, and the upper plastic part is provided with a second sinking platform for embedding at least part of the top sealing surface columns; the top cover column is provided with a first cover column body and a second cover column body which are connected up and down, and the area of the first cover column body is larger than that of the second cover column body; wherein, the second cover cylinder imbeds in the second sinks in the platform, first cover cylinder covers the upper surface of going up the plastic part.

11. The cover sheet for a battery according to claim 1, wherein the top surface of the negative post has a smaller area than the bottom surface of the negative post.

12. A battery, comprising:

an electric core;

the battery cell is placed in the shell, and an opening is formed in the top of the shell; and the number of the first and second groups,

the cap plate of any one of claims 1 to 11, which is used to cover the opening of the case.

13. The battery of claim 12, wherein the connection base plate has a butt-joint region abutting the negative post body and an outer-ground region outside the butt-joint region, and the region where the tab is connected to the connection base plate is at least partially located within the outer-ground region.

14. The battery according to claim 13, characterized in that any one of the following (9) to (11) is satisfied:

(9) the joint areas of the lugs and the connecting bottom plate are all positioned in the outer rubbing areas;

(10) the tab comprises a plurality of layers of electrode lead-out bodies, and the electrode lead-out bodies are stacked and welded to form a tab welding area on the tab;

the position of the axis of the negative pole column body on the connecting bottom plate is a first position, the center of the tab welding area is a second position and is positioned on one side, far away from the center of the cover plate assembly, of the connecting bottom plate, and the second position is positioned on one side, close to the center of the cover plate assembly, of the connecting bottom plate;

the first and second positions are non-collinear along a length of the cover plate assembly;

(11) the tab comprises a plurality of layers of electrode lead-out bodies, and the electrode lead-out bodies are stacked and welded to form a tab welding area on the tab;

the position of the axis of the negative pole column body on the connecting bottom plate is a first position, the center of the tab welding area is a second position and is positioned on one side, far away from the center of the cover plate assembly, of the connecting bottom plate, and the second position is positioned on one side, close to the center of the cover plate assembly, of the connecting bottom plate;

the first and second positions are non-collinear along a length of the cover plate assembly;

the tab welding area is a strip-shaped pole welding area which extends along the length direction of the cover plate assembly;

the length of the elongated pole welding area is a, and the vertical distance between the first position and the second position along the extension line of the width direction of the cover plate assembly is greater than or equal to 0.5 a.

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