CN214153031U - Cylindrical battery negative end cover and cylindrical battery thereof - Google Patents

Abstract

The utility model provides a cylindrical battery negative pole end cover and cylindrical battery thereof, wherein, cylindrical battery negative pole end cover includes the top sheet, be located top sheet top and with the riveting piece of top sheet isolation and the negative pole post of fixed connection riveting piece, the top sheet is equipped with first negative pole mounting hole and second negative pole mounting hole, the negative pole post is including insulation mounting in the first negative pole post and the second negative pole post of first negative pole mounting hole and second negative pole mounting hole respectively, be equipped with the upset piece that is located between first negative pole post and the second negative pole post on the top sheet, when the inside atmospheric pressure default of battery surpassed, the upset piece receives the atmospheric pressure to order about towards the upset of riveting piece direction and contact riveting piece with electric connection top sheet and negative pole post. The arrangement of the multi-cathode-post structure can improve overcurrent capacity and play a role in preventing rotation, the riveting block can be used as an external output part and can be combined with the turnover piece to form a safety device, the structure is compact, extra height size is not increased, and therefore the volume energy density is high, and the requirement of the existing high-energy-density battery can be met.

Description

Cylindrical battery negative end cover and cylindrical battery thereof

Technical Field

The utility model relates to an energy storage apparatus field especially relates to a cylindrical battery negative pole end cover and cylindrical battery thereof.

Background

With the support and popularization of the new energy automobile industry in China, the market demand for secondary batteries is increasing, and higher requirements are put forward on the capacity and the service life of the secondary batteries. The cylindrical battery has a high filling rate compared with the square battery, so that the cylindrical battery has the characteristic of high energy ratio, and the cylindrical battery is applied to the vehicle battery instead of the square battery by the existing battery manufacturers.

However, the conventional cylindrical battery, such as 18650 battery, has a limited battery flow area, which causes a large internal resistance of the battery, and affects the cycle life of the battery. Meanwhile, if the high-energy-density ternary battery system of the square battery is directly applied to the cylindrical battery, the safety and energy density of the battery are greatly reduced because the safety device of the square battery cannot be directly matched into the cylindrical battery at present.

This is due to: at present, in order to guarantee the security of square secondary battery, the upset piece is installed at the negative pole end of top cap usually among the prior art, and connect the top cap piece through positive terminal electricity, thereby when the battery leads to secondary battery inside atmospheric pressure to rise because of accidents such as overcharge or electrolyte emergence reaction, the upset piece overturns and forms the external current between anodal and the negative pole, stop overcharging, the resistance through the positive terminal slowly overflows the heat dissipation and releases the inside energy of secondary battery, thereby can not take place to overcharge, fire, dangers such as explosion, thereby improve secondary battery's security performance. In order to increase the overcurrent capacity, the size of the negative pole can be increased, and a cantilever beam is usually arranged on the negative pole to be used as a conducting strip which is contacted with the inverted sheet. And cylindrical battery's top cap piece also is circular usually, and its utilization ratio is far less than square battery when the installation, can't improve the ability of overflowing through the mode that increases utmost point post size, can waste more volume when parts such as integrated conducting strip, insulating part again on circular top cap piece moreover, therefore cylindrical battery is difficult to compromise energy density and security problem simultaneously.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a novel cylindrical battery negative pole end cover and cylindrical battery thereof, this cylindrical battery negative pole end cover can be integrated on the top cap piece with safety parts such as upset piece, and space utilization is high, can also improve the overcurrent ability.

In order to realize the above object, the utility model discloses a first aspect provides a cylindrical battery negative pole end cover, include the top sheet, be located top sheet top and with riveting piece and the fixed connection that the top sheet was kept apart the negative pole post of riveting piece, the top sheet is equipped with first negative pole mounting hole and second negative pole mounting hole, the negative pole post including respectively insulation mounting in first negative pole mounting hole with the first negative pole post and the second negative pole post of second negative pole mounting hole, be equipped with on the top sheet and be located first negative pole post with upset piece between the second negative pole post, when battery inside atmospheric pressure surpassed the default, the upset piece receives the atmospheric pressure to order about the court riveting piece direction upset and contact the riveting piece is connected with the electricity the top sheet with the negative pole post.

Compared with the prior art, the utility model discloses a cylindrical battery negative pole end cover sets up many negative pole post structures, not only can improve the overcurrent ability, still can play the rotation-proof effect, and will link to each other with utmost point post riveting piece as electrically conductive parts with be connected the upset piece after the upset, riveting piece has not only played traditional part as outside output and can also make up into the safety device who prevents overcharging with the upset piece, and this compact structure nature is good, need not increase extra height dimension, therefore volume energy density is high, can satisfy the demand of present high energy density battery.

Preferably, the riveting block is provided with a first riveting hole and a second riveting hole which are respectively riveted and fixed with the first negative pole and the second negative pole.

Preferably, a first insulating part is arranged between the top cover plate and the riveting block, the first insulating part is provided with a first penetrating hole and a second penetrating hole which are respectively used for the first negative pole column and the second negative pole column to penetrate, and a third penetrating hole which is used for the turnover piece to penetrate after the turnover piece is turned over is arranged between the first penetrating hole and the second penetrating hole.

Preferably, the turnover piece comprises a turnover part, a boss part arranged in the middle of the turnover part and an interconnecting part located at the edge of the turnover part and connected with the top cover plate, when the air pressure in the battery exceeds a preset value, the turnover piece is driven by the air pressure to turn over by the turnover part and contact the riveting block through the boss part, and the arrangement of the boss part can improve the overcurrent capacity of the turnover piece so as to prevent the welding block from being fused due to larger current when contacting the riveting block.

Preferably, the first negative pole post is sealed in the first negative pole mounting hole by a first sealing member, and the second negative pole post is sealed in the second negative pole mounting hole by a second sealing member.

Preferably, the top cover piece is further provided with an overturning piece mounting hole located between the first negative electrode mounting hole and the second negative electrode mounting hole, and the overturning piece is fixedly connected with the top cover piece and covers the overturning piece mounting hole.

Preferably, the first negative pole post and the second negative pole post are both connected to a connecting piece, and the connecting piece is connected with a negative pole piece of the battery and is electrically insulated from the top cover piece by a second insulating piece.

Preferably, the top cover piece is further provided with an explosion-proof valve, the second insulating part is provided with a plurality of meshes corresponding to the explosion-proof valve, and the meshes can prevent gas from being sprayed out of the explosion-proof valve to bring out combustible particles when large air pressure is generated inside the battery.

Preferably, the top cover sheet is further provided with a liquid injection hole, and the second insulating part is provided with a liquid injection through hole corresponding to the liquid injection hole.

Preferably, the second insulating part comprises a body part and a side wall surrounding the body part, the body part and the side wall surround to form a first accommodating part, the middle part of the body part is recessed inwards to form a second accommodating part, the connecting sheet is accommodated in the first accommodating part, the second accommodating part is provided with a gas flow channel and accommodates the turnover sheet, the first accommodating part can accommodate the connecting sheet, so that the space is fully utilized to improve the volume energy density, the second accommodating part accommodates the turnover sheet and is also provided with a gas flow channel, and the gas flow channel can play a role in gas confluence to improve the turnover sensitivity.

Preferably, the connecting piece comprises a body connected with the negative pole column, a connecting part connected with the negative pole piece and a transition part connected with the body and the connecting part, and the transition part is bent to fold the connecting part below the body. Further, set up the notch in order to form current fusing portion on the transition portion, the notch can be in the upset external current that forms disconnection when too big after the piece upset to thereby avoid parts such as top cap piece to fuse and cause more serious incident cutting off the external current.

Preferably, the body is provided with a first clamping hole and a second clamping hole for clamping the first negative pole column and the second negative pole column respectively, and the body is provided with a through hole which is communicated up and down between the first clamping hole and the second clamping hole.

The utility model discloses the second aspect provides a cylindrical battery, include cylindrical electric core, be used for holding the casing of cylindrical electric core, seal in the positive terminal cover of casing one end and seal in the negative terminal cover of the casing other end, positive terminal cover with the casing electricity is connected, the negative terminal cover is aforementioned cylindrical battery negative terminal cover, top cap piece fixed connection the casing, the upset piece is connected in upset back electricity the positive terminal cover with the negative pole post.

Preferably, the positive end cover comprises a positive top cover connected to the shell, a positive connecting piece connected to the positive electrode of the battery core, and a supporting piece connected to the positive top cover and the positive connecting piece, and the positive connecting piece penetrates through the supporting piece and is connected to the positive top cover.

The preferred, anodal top cap include anodal top cap piece and by anodal top cap piece is to keeping away from the direction of electric core extends the convex closure that forms, support piece is last to be equipped with a plurality of intercommunicating pore, anodal connection piece include anodal body, with anodal connecting portion, the connection of connecting of electric core anodal body with the anodal transition portion of anodal connecting portion, anodal transition portion buckle and will anodal connecting portion fold in the below of anodal body, be equipped with on the anodal body with the arch that the intercommunicating pore figure corresponds, the arch is worn to establish and the joint the intercommunicating pore and with anodal top cap piece welded fastening. The positive connecting piece of the positive end cover is provided with the bulge, the bulge is arranged on the positive connecting piece in a penetrating mode and is connected to the communicating hole of the support piece in a clamping mode, the structure is good in compactness and high in space utilization rate, the bulge and the communicating hole are connected in a clamping mode, the situation that the positive connecting piece is dislocated and moved to be disconnected with the positive top cover plate when the battery is collided violently is avoided, meanwhile, the communicating hole can also play a role in welding and positioning, and poor welding problems such as insufficient welding can be prevented.

Preferably, the support member has a support member body interposed between the positive electrode top cover plate and the positive electrode connecting sheet, the support member body is provided with a plurality of communicating holes, the edge of the support member body extends towards the direction of the battery cell and forms an enclosing part provided with a notch, the support member body and the enclosing part are combined to form an accommodating space, the positive electrode transition part is bent and accommodates the positive electrode connecting part in the accommodating space through the notch, and the accommodating space is arranged to fully utilize the space for accommodating the positive electrode connecting sheet so as to improve the volume energy density.

Preferably, the positive electrode transition part is provided with a positive electrode notch to form a current fusing part, and the notch can be disconnected when the current such as overcharge is too large so as to cut off the current, thereby avoiding more serious safety accidents caused by fusing of parts such as a positive electrode top cover plate and the like.

Drawings

Fig. 1 is a perspective view of an embodiment of a cylindrical battery according to the present invention.

Fig. 2 is a perspective view of an embodiment of the negative end cap of the cylindrical battery of the present invention.

Fig. 3 is a front view of the negative end cap of the cylindrical battery of fig. 2 before bending of the connecting tab.

Fig. 4 is a top view of the negative end cap of the cylindrical battery of fig. 2 before the tabs are bent.

Fig. 5 is a bottom view of the negative end cap of the cylindrical battery of fig. 2 before the tabs are bent.

Fig. 6 is a cross-sectional view taken along a-a of fig. 4.

Fig. 7 is a cross-sectional view taken along the line B-B in fig. 4.

Fig. 8 is an exploded view of fig. 2 in one orientation.

Fig. 9 is an exploded view of fig. 2 in another orientation.

Fig. 10 is a first variation of fig. 4.

Fig. 11 is a cross-sectional view in the direction C-C of fig. 10.

Fig. 12 is an exploded view of fig. 10 in one orientation.

Fig. 13 is an exploded view of fig. 10 in another orientation.

Fig. 14 is a second variation of fig. 4.

Fig. 15 is a cross-sectional view in the direction D-D of fig. 14.

Fig. 16 is an exploded view of fig. 14 in one orientation.

Fig. 17 is an exploded view of fig. 14 in another orientation.

Fig. 18 is a perspective view of an embodiment of the positive end cap of the cylindrical battery of the present invention.

Fig. 19 is a top view of the cylindrical battery negative end cap of fig. 18 prior to bending of the tab.

Fig. 20 is a bottom view of the cylindrical battery negative end cap of fig. 18 prior to bending of the connecting tabs.

Fig. 21 is a cross-sectional view taken along line a-a of fig. 20.

Fig. 22 is a cross-sectional view in the direction B-B of fig. 20.

Fig. 23 is an exploded view of fig. 20 in one orientation.

Fig. 24 is an exploded view of fig. 20 in another orientation.

Description of the elements

100-cylindrical batteries; 10-a housing; 30-a negative end cap; 310-a top cover sheet; 311-first negative mounting hole; 312-a second negative mounting hole; 313-turnover piece mounting holes; 314-inner boss; 315-outer boss; 316-explosion proof valve mounting hole; 317-liquid injection hole; 320-negative pole post; 320 a-a first negative post; 320 b-a second negative post; 321-a column portion; 323-platform section; 330-riveting block; 331-a first staking hole; 333-a second riveting hole; 340-turning over the sheet; 341-turnover part; 343-boss portion; 345-an interface; 350 — a first insulator; 351-a first through hole; 353-a second through hole; 355-a third through hole; 360 a-first seal; 360 b-a second seal; 370-a second insulator; 371-the body portion; 372-a side wall; 373-a first via; 374 — a second through hole; 375-a first housing part; 376-a second housing portion; 377-gas flow channel; 378-mesh; 379-liquid injection through hole; 380-connecting sheet; 381-body; 3811-a first snap hole; 3813-a second snap hole; 3815-a via; 3817-communicating holes; 383-a connecting portion; 385-a transition; 3851-a slot; 390-an explosion-proof valve; 50-positive end cap; 51-positive top cover; 511-positive pole top cover sheet; 5111-positive pole outer boss; 513-convex hull; 53-a support member; 531-support member body; 5311-a communicating hole; 533-enclosure portion; 535-notch; 55-positive connecting piece; 551-positive electrode body; 5513-a bump; 553 — a positive electrode transition; 5531-positive notches; 555-positive electrode connecting part

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It should be noted that, unless otherwise expressly specified, the terms "connected," "connected," and "fixed" are used broadly and encompass, for example, a connection that may be a fixed connection, a removable connection, a direct connection, an indirect connection via intermediate media, and a connection between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The following describes the negative electrode end cap of the cylindrical battery and the cylindrical battery thereof with reference to the accompanying drawings.

As shown in fig. 1 to 17, the cylindrical battery 100 includes a cylindrical battery cell (not shown), a casing 10 for accommodating the cylindrical battery cell, a positive end cap 50 sealed at one end of the casing 10, and a negative end cap 30 sealed at the other end of the casing 10, wherein the positive end cap 50 is electrically connected to the casing 10. The cylindrical battery negative end cover 30 comprises a top cover plate 310, a riveting block 330 and a negative pole column 320, wherein the riveting block 330 is located above the top cover plate 310 and is isolated from the top cover plate 310, the negative pole column 320 is fixedly connected with the riveting block 330, the top cover plate 310 is provided with a first negative pole mounting hole 311 and a second negative pole mounting hole 312, the negative pole column 320 comprises a first negative pole column 320a and a second negative pole column 320b which are respectively mounted in the first negative pole mounting hole 311 and the second negative pole mounting hole 312 in an insulating mode, the top cover plate 310 is provided with an overturning piece 340 located between the first negative pole column 320a and the second negative pole column 320b, and when the internal air pressure of the battery exceeds a preset value, the overturning piece 340 is driven by air pressure to overturn towards the riveting block 330 and contact the riveting block 330 so as to electrically connect the positive. Since the positive post 510 is electrically connected to the case 10, the contact rivet 330 can electrically connect the positive post 510 and the negative post 320 after the flip sheet 340 is flipped over, thereby forming an external short circuit to solve the problem of potential safety hazard caused by accidents such as overcharge or reaction of electrolyte. And cylindrical battery negative pole end cover 30 sets up two negative pole post structures, not only can improve the overcurrent ability, still can play the rotation-proof effect, and regard as electrically conductive part with riveting piece 330 that the utmost point post links to each other with upset piece 340 after the upset of connection, riveting piece 330 has not only played traditional part as the external output and can also make up with upset piece 340 and prevent the safety device that overcharges, and this compactness of structure is good, need not increase extra height size, therefore volume energy density is high, can satisfy the demand of present high energy density battery. Of course, in order to further improve the current capacity, the negative electrode posts 320 may be provided with more negative electrode posts, such as 3 negative electrode posts, 4 negative electrode posts, etc., besides the double negative electrode posts (the first negative electrode post 320a and the second negative electrode post 320b) shown in the figure, and the plurality of negative electrode posts should be uniformly arranged on the circular top cover plate 310.

As further shown in fig. 2 to 9, the riveting block 330 is provided with a first riveting hole 331 and a second riveting hole 332, which are riveted and fixed to the first negative pole 320a and the second negative pole 320b, respectively. The first negative pole 320a includes a column 321 and a platform 323 connected to the column 321, the platform 323 is clamped in the lower portion of the top cover 310, the column 321 is inserted into the first negative pole mounting hole 311 by a first sealing element 360a, the upper portion of the column 321 is riveted to the first riveting hole 331 by the riveting block 330, and the second negative pole 320b has a similar structure and is sealed to the second negative pole mounting hole 312 by a second sealing element 360 b.

The top cover sheet 310 is provided with an inverted sheet mounting hole 313 between the first negative electrode mounting hole 311 and the second negative electrode mounting hole 312, an inner boss 314 is provided at the edge of the inverted sheet mounting hole 313, an outer boss 315 is provided at the edge of the top cover sheet 310, and the negative electrode end cap 30 is welded to the case 10 through the outer boss 315 to seal the negative electrode end cap 30 to one end of the case 10. The turning sheet 340 comprises a turning part 341, a boss part 343 arranged in the middle of the turning part 341, and an interconnecting part 345 located at the edge of the turning part 341 and connected to the top cover sheet 310, the turning sheet 340 is welded and fixed to the inner boss 314 by the interconnecting part 345 and is fixedly connected to the top cover sheet 310 and covers the turning sheet mounting hole 313, and when the internal air pressure of the battery exceeds a preset value, the turning sheet 340 is driven by the air pressure to turn by the turning part 341 and contacts the riveting block 330 through the boss part 343. The arrangement of the boss portion 343 can improve the overcurrent capability of the flip sheet 340 to prevent the fuse from being fused due to a large current when contacting the rivet block 330.

Further, be equipped with first insulating part 350 between top cover plate 310 and the riveting piece 330, first insulating part 350 is equipped with first through-hole 351 and the second through-hole 353 that supplies first negative pole post 320a and the through-hole of second negative pole post 320b to wear to establish respectively, and is equipped with the third through-hole 355 that supplies upset piece 340 to wear to establish after the upset between first through-hole 351 and the second through-hole 353.

As further shown in fig. 2 to 9, the first negative electrode post 320a and the second negative electrode post 320b are connected to a connecting piece 380, and the connecting piece 380 is connected to a negative electrode tab (not shown) of the battery and electrically insulated from the top cover plate 310 by a second insulating member 370. The connecting piece 380 includes a body 381 connected to the negative pole post 320, a connecting portion 383 connected to the negative pole piece, and a transition portion 385 connecting the body 381 and the connecting portion 383, wherein the transition portion 385 is bent to fold the connecting portion 383 below the body 381. The body 381 is provided with a first clamping hole 3811 and a second clamping hole 3813 for clamping the first negative pole 320a and the second negative pole 320b, respectively, and the body 381 is provided with a through hole 3815 which is vertically communicated between the first clamping hole 3811 and the second clamping hole 3813. As further shown in fig. 10 to 17, the transition portion 385 is provided with notches 3851 to form a current fusing portion, and the notches 3851 can be cut off when an external current generated by the turnover piece 340 after turnover is too large, so as to cut off the external current, thereby preventing a more serious safety accident caused by fusing of the top cover piece 310 and other components.

The second insulating part 370 comprises a body part 371 and a side wall 372 surrounding the body part 371, the body part 371 and the side wall 372 surround to form a first containing part 375, the middle part of the body part 371 is inwards recessed to form a second containing part 376, the connecting sheet 380 is contained in the first containing part 375, the second containing part 376 is provided with a gas flow channel 377 and contains the turning sheet 340, the first containing part 375 can contain the connecting sheet 380, so that the space is fully utilized to improve the volume energy density, the second containing part 376 contains the turning sheet 340 and is also provided with the gas flow channel 377, and the gas flow channel 377 can play a role in gas confluence so as to improve the turning sensitivity. The main body 371 further defines a first through hole 373 and a second through hole 374 for the first negative pole 320a and the second negative pole 320b to pass through respectively.

The utility model discloses a when negative pole end cover 30 installed, first sealing member 360a was established to the cover behind first joint hole 3811, the first through-hole 373 in proper order to the cylinder portion 321 of first negative pole post 320a, wears to establish first negative pole mounting hole 311, first hole 351 of wearing to establish again and rivets in first riveting hole 331 with riveting piece 330. The column portion 321 of the second negative pole 320b sequentially penetrates through the second clamping hole 3813 and the second through hole 374 and then is sleeved with the second sealing member 360b, and then penetrates through the second negative pole mounting hole 312 and the second through hole 353 and then is riveted with the riveting block 330 to the second riveting hole 333.

Of course, the utility model discloses a also can integrate explosion-proof valve 390 on negative pole end cover 30, as shown in fig. 10 ~ 13, be equipped with explosion-proof valve mounting hole 316 on the top cap piece 310, explosion-proof valve 390 welded fastening is in explosion-proof valve mounting hole 316, and second insulator 370 corresponds explosion-proof valve 390 department and is equipped with a plurality of meshes 378, and mesh 378 can prevent when the inside great atmospheric pressure that produces of battery, and gaseous from explosion-proof valve blowout and take out combustible particles thing. Of course, in order to ensure the circulation of gas, the connecting piece 380 is provided with a communicating hole 3817 having the same center axis as the explosion-proof valve 390, and the horizontal size of the first insulating member 350 should be smaller than that of the top cover 310 to ensure the exposure of the explosion-proof valve 390.

The utility model discloses a liquid hole 317 is annotated to also integratively on negative pole end cover 30, as shown in fig. 14 ~ 17, be equipped with on the top cap piece 310 and annotate liquid hole 317, in order to guarantee annotating going on of liquid, second insulator 370 corresponds annotates liquid hole 317 department and is equipped with notes liquid through-hole 379, sets up on the connection piece 380 with the intercommunicating pore 3817 of annotating liquid hole 317 with the center pin, the horizontal dimension of first insulator 350 should be less than top cap piece 310 in order to guarantee to expose and annotate liquid hole 317 simultaneously.

The positive electrode cap plate 50 has a relatively simple structure, and the positive electrode cap 50 is electrically connected to the case 10 by removing the inversion sheet 340 from the negative electrode cap plate 30 while leaving the other parts and by adding conductive particles, such as conductive carbon or conductive metal, during the injection molding of the first insulating member 350. Of course, the positive post (not shown) may be directly welded to the positive top cover, or the positive top cover may be protruded away from the battery cell to directly form the positive post. Of course, the positive electrode cover plate 50 may have the structure shown in FIGS. 18 to 24,

as shown in fig. 18 to 24, the positive end cap 50 includes a positive end cap 51, a positive connection piece 55 connected to the positive electrode of the battery cell, and a support 53 connected to the positive end cap 51 and the positive connection piece 55, the positive end cap 51 includes a positive top cover sheet 511 and a convex hull 513 formed by extending the positive electrode from the top cover sheet 511 to a direction away from the battery cell, the convex hull 513 is used as a positive electrode pole, the positive top cover sheet 511 and the convex hull 513 are integrally formed, a positive outer boss 5113 is disposed at the edge of the positive top cover sheet 511, a groove (not shown in the figure) is disposed at the open end of the casing 10, and the positive end cap 50 is embedded and welded to the groove of the casing 10 through the positive outer boss 5113 to seal the positive end cap 50 at one end of the casing 10. The support member 53 is provided with a plurality of communicating holes 5311, the positive connecting piece 55 comprises a positive body 551, a positive connecting part 555 connected with the positive electrode of the battery cell, and a positive transition part 553 connecting the positive body 551 and the positive connecting part 555, wherein the positive transition part 553 is bent to fold the positive connecting part 555 below the positive body 551, the positive body 551 is provided with protrusions 5513 corresponding to the number of the communicating holes 5311, the protrusions 5513 penetrate through and are clamped with the communicating holes 5311 and are welded and fixed with the positive top cover plate 511, and the protrusions can be fixed by ultrasonic welding or laser welding. The bulge 5513 penetrates through and is clamped on the communicating hole 5311 of the support piece 53, the structure is compact and good, the space utilization rate is high, the bulge and the communicating hole 5311 are mutually clamped, the situation that the positive connecting piece 55 is dislocated and moved to be disconnected with the positive top cover plate 511 when the battery is violently impacted is avoided, meanwhile, the communicating hole 5311 can also play a role in welding and positioning, and the poor welding problems such as insufficient welding and the like can be prevented.

As further shown in fig. 18 to 24, the support 53 has a support body 531 interposed between the positive top cover sheet 511 and the positive connection sheet 55, the support body 531 is provided with a plurality of communication holes 5311, the edge of the support body 531 extends toward the cell and forms a surrounding portion 533 provided with a notch 535, the support body 531 and the surrounding portion 533 are combined to form an accommodation space, the positive transition portion 553 bends and accommodates the positive connection portion 555 in the accommodation space through the notch 535, and the accommodation space is configured to accommodate the positive connection sheet 55 so as to fully utilize the space and increase the volumetric energy density. Meanwhile, the positive electrode transition portion 553 is provided with a positive electrode notch 5531 to form a current fusing portion, and the positive electrode notch 5531 may be disconnected when a current such as overcharge is too large, so as to cut off the current, thereby preventing more serious safety accidents caused by fusing of components such as the positive electrode top cover plate 511.

It should be noted that the above-mentioned embodiments illustrate rather than limit the scope of the invention, and that modifications of various equivalent forms of the invention, which may occur to those skilled in the art after reading the present application, fall within the scope of the appended claims.

Claims (16)

1. The cylindrical battery negative end cover (30) is characterized by comprising a top cover plate (310), a riveting block (330) and a negative pole column (320), wherein the riveting block (330) is located above the top cover plate (310) and isolated from the top cover plate (310), the negative pole column (320) is fixedly connected with the riveting block (330), the top cover plate (310) is provided with a first negative pole mounting hole (311) and a second negative pole mounting hole (312), the negative pole column (320) comprises a first negative pole column (320a) and a second negative pole column (320b) which are respectively mounted in the first negative pole mounting hole (311) and the second negative pole mounting hole (312) in an insulation mode, an overturning sheet (340) is arranged on the top cover plate (310) and located between the first negative pole column (320a) and the second negative pole column (320b), and when the internal air pressure of a battery exceeds a preset value, the overturning sheet (340) is driven to overturn towards the riveting block (330) by the air pressure and contact the riveting block (330) so as to be electrically connected with the top cover plate (310) and the riveting block (330) and the negative pole column (320) The negative post (320).

2. The cylindrical battery negative end cap (30) of claim 1, wherein the riveting block (330) is provided with a first riveting hole (331) and a second riveting hole (332) which are riveted and fixed with the first negative pole (320a) and the second negative pole (320b), respectively.

3. The negative end cap (30) of the cylindrical battery as claimed in claim 1, wherein a first insulating member (350) is disposed between the top cover plate (310) and the riveting block (330), the first insulating member (350) has a first through hole (351) and a second through hole (353) for the first negative pole (320a) and the second negative pole (320b) to pass through, respectively, and a third through hole (355) for the turning piece (340) to pass through after turning is disposed between the first through hole (351) and the second through hole (353).

4. The cylindrical battery negative end cap (30) of claim 1, wherein the top cover sheet (310) is further provided with an inverted sheet mounting hole (313) between the first negative mounting hole (311) and the second negative mounting hole (312), and the inverted sheet (340) is fixedly connected to the top cover sheet (310) and covers the inverted sheet mounting hole (313).

5. The cylindrical battery cathode end cap (30) according to claim 4, wherein the turning sheet (340) comprises a turning part (341), a boss part (343) arranged in the middle of the turning part (341), and an interface part (345) located at the edge of the turning part (341) and connected with the top cover sheet (310), and when the air pressure inside the battery exceeds a preset value, the turning sheet (340) is driven by the air pressure to turn over by the turning part (341) and contact the riveting block (330) through the boss part (343).

6. The cylindrical battery negative end cap (30) of claim 1, wherein the first negative post (320a) and the second negative post (320b) are both connected to a connecting tab (380), and the connecting tab (380) is connected to a negative plate of a battery and is electrically insulated from the top cover plate (310) by a second insulator (370).

7. The cylindrical battery negative end cap (30) of claim 6, wherein the connecting piece (380) comprises a body (381) connected with the negative pole post (320), a connecting part (383) connected with the negative pole piece, and a transition part (385) connecting the body (381) and the connecting part (383), wherein the transition part (385) is bent to fold the connecting part (383) below the body (381).

8. The cylindrical battery negative end cap (30) of claim 7, wherein the transition portion (385) is notched to form a current fuse (3851).

9. The cylindrical battery negative end cap (30) according to claim 7, wherein the body (381) is provided with a first clamping hole (3811) and a second clamping hole (3813) for clamping the first negative pole (320a) and the second negative pole (320b), respectively, and a through hole (3815) which is through from top to bottom is formed between the first clamping hole (3811) and the second clamping hole (3813) of the body (381).

10. The cylindrical battery negative end cap (30) of claim 6, wherein the top cover sheet (310) is further provided with an explosion-proof valve (390), and the second insulating member (370) is provided with a plurality of meshes (378) corresponding to the explosion-proof valve (390).

11. The cylindrical battery negative end cover (30) according to claim 6, wherein the top cover sheet (310) is further provided with a liquid injection hole (317), and the second insulating member (370) is provided with a liquid injection through hole (379) corresponding to the liquid injection hole (317).

12. A cylindrical battery (100) is characterized by comprising a cylindrical battery core, a shell (10) for accommodating the cylindrical battery core, a positive end cover (50) sealed at one end of the shell (10) and a negative end cover (30) sealed at the other end of the shell (10), wherein the positive end cover (50) is electrically connected with the shell (10), the negative end cover is the cylindrical battery negative end cover (30) of any one of claims 1 to 11, the top cover sheet (310) is fixedly connected with the shell (10), and the turnover sheet (340) is electrically connected with the positive end cover (50) and the negative pole column (320) after being turned over.

13. The cylindrical battery (100) according to claim 12, wherein the positive end cap (50) comprises a positive end cap (51) connected to the housing (10), a positive connection piece (55) connected to the positive electrode of the cell, and a support member (53) connected to the positive end cap (51) and the positive connection piece (55), wherein the positive connection piece (55) penetrates through the support member (53) and is connected to the positive end cap (51).

14. The cylindrical battery (100) according to claim 13, the positive electrode top cover (51) comprises a positive electrode top cover sheet (511) and a convex hull (513) formed by extending the positive electrode top cover sheet (511) to the direction far away from the battery core, the support piece (53) is provided with a plurality of communicating holes (5311), the positive pole connecting piece (55) comprises a positive pole body (551), a positive pole connecting part (555) connected with the positive pole of the battery cell, and a positive pole transition part (553) connected with the positive pole body (551) and the positive pole connecting part (555), the positive electrode transition portion (553) is bent to fold the positive electrode connecting portion (555) below the positive electrode body (551), the positive electrode body (551) is provided with bulges (5513) corresponding to the number of the communicating holes (5311), the bulge (5513) penetrates through and is clamped with the communication hole (5311) and the positive top cover plate (511) in a welded and fixed mode.

15. The cylindrical battery (100) according to claim 14, wherein the support member (53) has a support member body (531) interposed between the positive electrode top cover sheet (511) and the positive electrode connecting sheet (55), the support member body (531) is provided with a plurality of the communicating holes (5311), the edge of the support member body (531) extends towards the cell direction and forms a surrounding portion (533) provided with a notch (535), the support member body (531) and the surrounding portion (533) are combined to form a receiving space, and the positive electrode transition portion (553) is bent to receive the positive electrode connecting portion (555) in the receiving space through the notch (535).

16. The cylindrical battery (100) according to claim 14, wherein a positive notch (5531) is provided on the positive transition portion (553) to form a current fusing portion.

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