WO2019178900A1

WO2019178900A1 - Battery top cover having protective structure

Info

Publication number: WO2019178900A1
Application number: PCT/CN2018/082344
Authority: WO
Inventors: 王有生; 丁朝阳; 陆宾林; 丁坤
Original assignee: 深圳市瑞德丰精密制造有限公司
Priority date: 2018-03-21
Filing date: 2018-04-09
Publication date: 2019-09-26

Abstract

Disclosed is a battery top cover that has a protective structure, comprising: a cover plate, an electrode pole disposed on the cover plate, and an electrode tab disposed below the electrode pole, wherein the electrode pole is provided thereon with a first vent hole, and the electrode tab is provided thereon with a plurality of second vent holes; a turnover cavity and a pull-off piece are further disposed between the electrode pole and the electrode tab, wherein the pull-off piece isolates and closes off the first vent hole from the second vent holes, and the pull-off piece is fixedly connected to the electrode tab; and the electrode tab is provided thereon with a break strip. In the present application, by means of the pull-off piece and the first vent hole being provided on the electrode pole, the pull-off piece being connected to the electrode tab, and the break strip being provided on the electrode tab, when the internal pressure of a battery increases, the pressure pushes the pull-off piece to turn over, and the electrode tab is stressed to break from the break strip such that an inner part of the battery is broken, and the pressure is released by means of the first vent hole, thereby preventing the pulling force from increasing due to an increase in pressure inside of the turnover cavity, and effectively protecting the battery and a user.

Description

Battery cover with protective structure

Technical field

The present application relates to the field of battery production, and in particular to a battery cover having a protective structure.

Background technique

With the development of electronic products, the use of batteries is becoming more and more widespread. Because of the miniaturization and portability of electronic products, a stable and convenient power source is needed. The battery is just because of its simple structure, easy to carry, easy to charge and discharge, not affected by the external climate and temperature, stable and reliable performance, playing a great role in all aspects of modern social life. The top cover of the battery includes a cover sheet and a pole, and the quality of the top cover directly affects the performance of the battery.

In the top cover of the battery, the pole plays the role of transmitting power. There is no protection mechanism in the existing pole. After the internal heating of the battery is pressurized, even if there is explosion rupture of the rupture disk, the electrical connection between the inner pole and the pole still exists. There are still hidden dangers.

Application content

The purpose of the present application is to provide a battery top cover having a protective structure in view of the above-mentioned drawbacks of the prior art.

The technical solution adopted in the present application is to design a battery top cover having a protective structure, comprising: a cover plate, a pole disposed on the cover plate, and a tab disposed under the pole, the pole a first vent hole is disposed, the pole is provided with a plurality of second vent holes, and an inversion cavity and a pull piece are further disposed between the pole and the tab, and the pull piece is to be the first pass The air hole is separated from the second vent hole, and the pull piece is fixedly connected with the tab; the pole is provided with a breaking belt.

Preferably, the tab is provided with a connecting hole, and the pulling piece is provided with a downwardly extending boss, and the boss is fixedly disposed at the connecting hole. The connecting hole is connected to the outer circumference of the boss. When the inside of the battery is heated and the pressure is increased, the pull piece is pressed and reversed, and the boss moves with the turning of the pull piece to make the break band of the tab The force is broken, and the connection between the tabs and the above is broken to open the battery inside.

Preferably, the pull tab protrudes downward in a tapered structure. The tapered structure causes the pull tab to have a turning margin, so that the pull tab is prevented from being pulled continuously due to insufficient flip height, and thus the complete separation of the tab from the pole cannot be achieved.

Preferably, the fracture zone is arranged in a ring shape around the connection hole. The distance from the fracture zone to the connection hole is the same, the force is uniform, the synchronization of the fracture is higher, and more complete.

Preferably, the fracture zone is disposed between the second ventilation holes and connects the second ventilation holes. The second vent hole connects the fracture zone, reduces the length of the fracture zone, reduces the resistance at the time of fracture, and effectively increases the fracture speed, and the pitch of the second vent hole is related to the current of the battery.

Preferably, the fracture zone is a groove structure disposed on the tab. The groove structure makes the contact surface of the fracture zone and the tab a small, effectively speeding up the formation of the fracture.

Preferably, the groove structure has a V-shaped cross section. The cross section is V-shaped, and the fracture zone is fractured on one circumference, and the fracture is neat and the fracture path is reduced.

Preferably, a protective bracket disposed under the tab is further included. The protective bracket can prevent the metal generated by the breakage of the tabs from falling into the interior of the battery, thereby causing problems such as battery igniting caused by internal changes of the battery.

Preferably, the protection bracket is provided with a third ventilation hole. The third vent hole communicates with a space in which the tab is located and a space inside the battery.

Preferably, the protection bracket is provided with a fastening portion, and the fastening portion is connected to the cover plate. The protection bracket is connected to the cover plate to make the protection bracket more stable.

Compared with the prior art, the present application has at least the following beneficial effects: the present invention provides a pull tab and a first vent hole on the pole, the pull tab is connected to the tab, and the break band is disposed on the tab, and the pressure inside the battery is increased. When the pressure is large, the pressure pushes the broken piece to reverse, and the pole is broken from the broken belt after being subjected to the force, thereby breaking the internal part of the battery and releasing the pressure through the first vent hole to prevent the breaking force from being increased due to the increase of the pressure in the inversion chamber. Effectively protects the battery and the user.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings to be used in the embodiments will be briefly described below. Obviously, the drawings in the following description are only some embodiments of the present application, Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work.

1 is a schematic overall view of an embodiment of the present application;

Figure 2 is a schematic cross-sectional view showing an embodiment of the present application;

3 is a schematic view showing the connection between a pole and a tab according to an embodiment of the present application;

4 is a schematic cross-sectional view showing a connection between a pole and a tab according to an embodiment of the present application;

FIG. 5 is a schematic diagram of a polar ear according to an embodiment of the present application; FIG.

Figure 6 is a partial enlarged view of a portion A in Figure 2 of the embodiment of the present application;

Figure 7 is a schematic view showing the overall explosion of a cover plate embodiment of the present application;

Figure 8 is a schematic exploded view of a cover plate of a cover embodiment of the present application;

9 is a schematic view showing the bottom shaft of the cover plate of an embodiment of a cover plate of the present application;

Figure 10 is a partial cross-sectional view showing a cover of an embodiment of a cover plate of the present application;

Figure 11 is a partially enlarged schematic view of Aa in Figure 10 of the present application;

12 is a schematic view of a tab holder of a cover embodiment of the present application;

Figure 13 is a schematic exploded view of another cover embodiment of the present application;

Figure 14 is a cross-sectional view showing another embodiment of the cover of the present application;

Figure 15 is a partial enlarged view of the Ab in Figure 14 of the present application;

Figure 16 is a partial enlarged view of Bb in Figure 14 of the present application;

Figure 17 is a cross-sectional view showing a cover assembly of another cover embodiment of the present application;

18 is a schematic bottom view of a cover assembly of another cover embodiment of the present application;

19 is a schematic structural view of a tab of a cover assembly of another cover embodiment of the present application;

Figure 20 is a cross-sectional view along Ac-Ac of Figure 19 of the embodiment of the present application;

Figure 21 is a cross-sectional view along line Bc-Bc of Figure 19 of the embodiment of the present application;

Figure 22 is an isometric view of the tab structure of the cover assembly of yet another embodiment of the cover of the present application.

detailed description

The technical solutions in the embodiments of the present application are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present application. It is obvious that the described embodiments are a part of the embodiments of the present application, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present application without departing from the inventive scope are the scope of the present application.

As shown in FIG. 1-6, the present application provides a battery cover having a protective structure, including: a cover plate 1, a pole 6 disposed on the cover plate 1, and a lower portion of the pole 6 a pole 2, the pole 6 is provided with a first venting hole 61, and the pole 2 is provided with a plurality of second venting holes 21 between the pole 6 and the tab 2 An inversion cavity 63 and a pull piece 5 are provided, the pull piece 5 is used to isolate the first ventilation hole 61 and the second ventilation hole 21, and the pull piece 5 is fixedly connected with the tab 2; A break band 23 is provided on the ear 2. When the internal pressure of the battery increases, the pressure pushes the pull piece to reverse, and the pole 2 breaks from the breaking belt 23 after being subjected to the force, thereby breaking the inside of the battery and releasing the pressure through the first vent hole 61, thereby preventing the pressure inside the turning chamber 63 from being depressed. The increase and increase of the breaking force makes the pull piece 5 difficult to break, effectively protecting the battery and the user. In the present embodiment, the first vent hole 61, the second vent hole 21, the pull tab 5 and the break band 23 on the tab 2 form a protective structure on the battery top cover, which effectively protects the use safety of the battery.

Further, the cover plate 1 is provided with a pole setting hole 4, and the pole setting hole 4 is provided with a sealing ring 9 for sealing the inside of the battery.

Further, the pole 6 is positioned by an inner ring body 7 and an outer ring body 8. The inner ring body 7 is provided with an annular positioning groove on the inner circumference, and the outer circumference of the pole column 6 is provided with a positioning ring body. The positioning ring body is disposed in the annular positioning groove to fix the pole 6 . The outer ring body 8 is provided with an annular fastening portion 81. The inner ring body 7 is provided with an annular fastening groove on the outer circumference. The annular fastening portion is fastened in the annular fastening groove to fix the inner ring body 7. The inner ring body is further provided with a wrapping portion 71 for wrapping the annular fastening portion 81 on the outer ring body. As a result, the annular fastening portion 81 is protected from deformation and folding. The annular wrapping portion 71 has an arc-shaped structure, and the force distribution of the curved structure is relatively uniform and is not easily broken.

In the embodiment of the present application, the pull tab 5 and the first vent hole 61 are disposed on the pole 6 , and the pull tab 5 is connected to the tab 2 , and the tab 2 is provided with the The breaking zone 23, when the internal pressure of the battery increases, the pressure pushes the pulling piece 5 to be reversed, and the tab 2 is broken from the breaking belt 23 after being forced to break, thereby breaking the inside of the battery, and passing the A venting hole 61 is released from pressure to prevent the pulling piece 5 from increasing the breaking force due to an increase in pressure in the turning chamber, thereby effectively protecting the battery and the user.

Further, a cover sheet 62 is disposed on the first vent hole 61, and the cover sheet 62 can be punched out.

Further, the number of the second ventilation holes 21 is three, and is disposed around the connection between the pull piece 5 and the tab 2 .

In the embodiment of the present application, the tab 2 is provided with a connecting hole 22, and the pull tab 5 is provided with a downwardly extending boss 51, and the boss 51 is fixedly disposed at the connecting hole 22. The connecting hole 22 is connected to the outer circumference of the boss 51. When the inside of the battery is heated and the pressure is increased, the pull piece 5 is pressed and reversed, and the boss 51 moves with the turning of the pull piece 5, so that the The breaking band 23 of the tab 2 is broken by force, breaking the connection of the tab 2 to the inside, and breaking the inside of the battery.

Further, the boss 51 has a cylindrical structure, and the connecting hole 22 is adapted to the boss 51 to be circular, which is convenient for mounting and welding. When the pull piece 5 is turned over, the tab 2 is stressed. Evenly.

Further, the boss 51 is provided with a concave structure to reduce the weight of the pull tab 5.

Of course, the boss 51 can also be other shape structures, and the connecting hole 22 is also changed to an adaptive structure.

In the embodiment of the present application, the pull piece 5 protrudes downward in a tapered structure. The tapered structure has the pull-off piece 5 having a turnover margin, so that the pull-off piece 5 is prevented from being pulled continuously due to insufficient flip height, and thus the complete separation of the tab 2 and the pole 6 cannot be achieved, and further As a result, the inside of the battery cannot effectively form an open circuit.

Specifically, when the internal pressure of the battery increases, the pull tab 5 is turned into the flip cavity 63 under the pushing of the internal pressure of the battery to form an upwardly protruding tapered structure. In the process, the pole The ear 2 is broken, and the breaking portion is connected to the pull piece 5, and the pole 6 forms an open circuit with the tab 2.

In the embodiment of the present application, the breaking belt 23 is arranged in a ring shape around the connecting hole 22. The distance between the fracture zone 23 and the connecting hole 22 is the same, the force is uniform, and the synchronization of the fracture is higher and more complete.

Of course, the fracture zone 23 may also be arranged in other forms, such as a square or the like.

In the embodiment of the present application, the breaking belt 23 is disposed between the second ventilation holes 21 and connected to the second ventilation holes 21. The second vent hole 21 is connected to the fracture zone 23 to reduce the length of the fracture zone 23, reduce the resistance at the time of fracture, and effectively improve the fracture speed.

Further, the length of the fracture zone 23 is designed according to the magnitude of the current, that is, the pitch of the second ventilation hole 21 is designed according to the demand of the current of the battery.

Further, the second venting hole 21 has a circular arc shape, and the breaking belt 23 is conveniently disposed.

Further, the fracture zone 23 is three fracture zones 23 disposed between the second ventilation holes 21.

In the embodiment of the present application, the breaking belt 23 is a groove structure disposed on the tab 2 . The groove structure makes the contact surface of the fracture zone 23 and the tab 2 small, effectively speeding up the fracture speed of the fracture zone 23.

Further, the groove structure is disposed on the lower surface of the tab 2 to facilitate breakage.

As an embodiment, the groove structure is provided on the upper surface of the tab 2 .

As an embodiment, the groove structure is disposed on the upper and lower surfaces of the tab 2 .

In the embodiment of the present application, the groove structure has a V-shaped cross section. The cross section is V-shaped, and the fracture zone 23 is fractured on one circumference, and the fracture is neat and the fracture path is reduced.

Of course, the cross section of the groove structure may also be other shapes that are easy to break, for example, the upper and lower surfaces are provided with an X shape of the groove structure.

In the embodiment of the present application, the protection bracket 3 is provided with a third ventilation hole. The third vent hole communicates with a space in which the tab 2 is located and a space inside the battery.

Specifically, the third vent hole guides the internal pressure of the battery to the boss 51 of the pull piece 5, so that the boss 51 is concentrated by force. Further, the diameter of the third vent hole is smaller than the diameter of the connection break hole to prevent metal cutting from falling from the third vent hole into the battery interior after the break band 23 is broken.

In the embodiment of the present application, the protection bracket 3 is provided with a fastening portion, and the fastening portion is connected to the cover plate 1 through the fastening portion. The protection bracket 3 is connected to the cover plate 1 to make the protection bracket 3 more stable.

As an embodiment, the protection bracket 3 is provided with a fastening portion, and the fastening portion is connected to the tab 2 through the fastening portion, and the protection bracket 3 is connected to the tab 2 to effectively position the first bracket. The position of the three vent holes and the fracture zone 23 effectively prevents metal cutting from falling into the interior of the battery after the fracture.

As shown in FIG. 7-12, the present application further provides a fixing structure of a battery cover, comprising: an upper cover 1a, a lower cover 5a, and a tab holder 3a detachably connected to the lower cover 5a. The upper cover plate 1a and the lower cover plate 5a are respectively provided with pole-arranging holes 4a; wherein the outer poles of the bottom plate 5a are provided with a first fastening portion 53a, the pole The ear holder 3a is provided with a second fastening portion 32a, and a fastening frame 52a that cooperates with the second fastening portion 32a is disposed below the cover plate.

Further, the fixing structure of the battery cover further includes: a pole 6a disposed in the pole setting hole 4a, and a tab 2a electrically connected to the pole 6a, the pole 6a is disposed at The pole is disposed above the hole 4a, and the tab 2a is disposed below the pole setting hole 4a.

Further, the pole 6a is positioned by an inner ring body 7a and an outer ring body 8a. The inner ring body 7a is provided with an annular positioning groove on the inner circumference, and the outer circumference of the pole column 6a is provided with a positioning ring body. The ring body is disposed in the annular positioning groove to fix the pole 6a. The outer ring body 8a is provided with an annular fastening portion. The inner ring body 7a is provided with an annular fastening groove on the outer circumference. The portion is fastened in the annular fastening groove to fix the inner ring body 7a.

Further, the fixing structure of the battery cover further includes a sealing ring 9a disposed outside the pole setting hole 4a, and cooperates with the inner ring body 7a to seal the inside of the battery.

In this embodiment, the fastening frame 52a is provided with a hollow structure formed by extending downward on the reinforcing rib of the lower cover 5a. The reinforcing rib is integrally formed with the lower cover 5a, and the hollow structure on the reinforcing ribs makes the strength of the fastening frame 52a higher.

Of course, the fastening frame 52a can also be separately formed and connected to the lower cover 5a.

In the present embodiment, the lower cover 5a pole-providing hole 4a is provided with a receiving groove 51a along the outer circumference of the first engaging portion 53a, and the upper end of the second engaging portion 32a is located in the receiving groove 51a. The accommodating groove 51a is for defining a position of the upper end of the second engaging portion 32a so that the second engaging portion 32a does not rub against the cover when the strength is maintained.

Further, the receiving groove 51a is a through groove formed by extending the edge of the first engaging portion 53a, and defines the width of the receiving groove 51a to ensure the structural strength of the entire cover.

In the present embodiment, the outer periphery of the pole-arranging hole 4a of the upper cover 1a is provided with a sinking groove 11a, and the first engaging portion 53a is fastened to the inner edge of the sinking groove 11a. The upper cover 1a is fixed to the lower cover 5a by the first engaging portion 53a, and the fixing effect is enhanced to make the upper cover 1a and the lower cover 5a more compact.

Further, the height of the sinking groove 11a is adapted to the first engaging portion 53a so that the first engaging portion 53a can engage the upper cover 1a.

In this embodiment, the second fastening portion 32a is an outward fastening. The second engaging portion 32a is outwardly oriented, and the tab holder 3a can be better fixed to the lower cover 5a to enhance the fixing effect.

Of course, the second fastening portion 32a may also be inwardly fastened to the fastening frame 52a.

In the embodiment, the second fastening portion 32a of the tab holder 3 is provided with an opening groove 31a. The opening groove 31a allows the second fastening portion 32a to be molded better during processing, and at the same time, the elasticity of the second fastening portion 32a is increased.

Further, the opening groove 31a is a through groove formed by extending the edge of the second fastening portion 32a, and defines the width of the opening groove 31a to ensure the overall performance and strength of the tab holder 3a.

In this embodiment, the pole-arranging hole 4a is a ring body protruding from the upper and lower surfaces of the lower cover 5a. Easy to locate and install.

Further, the pole 6a is disposed in the upper convex body, and the tab 2a is disposed in the lower convex body.

In this embodiment, the first fastening portion 53a is disposed on the outer circumference of the ring. It is used to fasten the upper cover 1a to make the upper cover 1a connection more secure.

Further, the first fastening portion 53a is an inner edge of the pole-arranging hole 4a that is outwardly fastened to the upper cover 1a.

In this embodiment, the first fastening portion 53a is disposed on a non-arc surface of the outer circumference of the ring. The non-arc surface is disposed such that the first fastening portion 53a is structurally stable and the process is simple.

As shown in FIG. 13-16, the present application further provides a cover plate for preventing the falling pole, comprising: an upper cover 1b, a lower cover 2b, a pole 6b and a pole fixing assembly, and the upper cover 1b A corresponding pole setting hole 5b is disposed on the lower cover 2b; wherein the pole fixing assembly comprises: an outer ring body 11b, and an inner ring body 8b coupledly coupled with the outer ring body 11b, the outer ring body 11b is integrally formed with the upper cover 1b, and the outer ring body 11b is wrapped around the outer circumference of the inner ring body 8b.

In this embodiment, the outer ring body 11b is integrally formed with the upper cover plate 1b, the inner ring body 8b is fixedly wrapped by the outer ring body 11b, and the pole 6b is the inner ring body 8b. In the process of fixing, the pole 6b is fixed only by the cooperation relationship between the outer ring body 11b, the inner ring body 8b and the pole column 6b, and does not need to be fixed by welding, thereby saving the process. Reduced costs.

The inner ring body 8b and the inner ring body 8b may also have an integral structure, which saves the installation process.

The inner ring body 8b and the pole 6b may have an integral structure, which saves the installation process.

In this embodiment, the outer ring body 11b encloses the inner ring body 8b, and the inner ring body 8b is provided with an inner buckle structure 111b. The inner ring body 8b is provided with an annular buckle groove 81b corresponding to the inner buckle structure 111b. The inner buckle structure 111b is inserted into the annular buckle groove 81b. The inner buckle structure 111b of the outer ring body 11b is inserted into the annular buckle groove 81b of the inner ring body 8b to define the position of the inner ring body 8b, and the outer ring body 11b wraps the inner ring body 8b is tightly fixed so that the inner ring body 8b does not need to be welded.

Further, the outer ring body 11b is provided with an arc-shaped structure, and the force distribution of the curved structure is relatively uniform and is not easy to be broken.

In the embodiment, the upper cover 1b is further provided with a rupture disk setting hole 9b. The rupture disk providing hole 9b is for mounting the rupture disk 93b. When the internal pressure of the battery is too high, the rupture disk 93b is blasted to reduce the pressure inside the battery.

In the embodiment, the rupture disk providing hole 9b is provided with a thickening ring body 91b. The thickened ring body 91b can prevent the occurrence of melt penetration due to high welding temperature when the rupture disk 93b is welded.

Further, the thickening ring body 91b and the upper cover plate 1b are integrally formed.

In the present embodiment, the rupture disk mounting hole 9b is provided with a rupture disk mounting groove 92b. The rupture disk mounting groove 92b is used for welding the rupture disk 93b, and the edge of the rupture disk 93b is welded into the rupture disk mounting groove 92b so as not to fall off.

Further, the rupture disk mounting groove 92b is disposed under the thickened ring body 91b, so that the rupture disk 93b is welded more easily, and the phenomenon of melt penetration does not occur.

In the present embodiment, the inner ring body 8b is provided with a pole positioning groove 82b on the inner circumference. The pole positioning groove 82b serves to define the position of the pole 6b and prevent the pole 6b from falling into the interior of the battery.

Further, the pole positioning groove 82b is annularly disposed on the inner circumference of the inner ring body 8b, and the annular arrangement is convenient for installation, and the contact area of the inner ring body 8b and the pole column 6b is enlarged, and the fixing effect is better. .

Of course, the pole positioning groove 82b may also be discontinuously disposed on the inner circumference of the inner ring body 8.

In this embodiment, the outer circumference of the pole 6b is provided with a positioning ring body 61b, and the positioning ring body 61b is adapted to the pole positioning groove 82b. The positioning ring body 61b is embedded in the pole positioning groove 82b to fix the pole 6b and prevent the pole 6b from falling into the battery interior.

Further, the positioning ring body 61b is adapted to the pole positioning groove 82b, and may be a continuous ring body or a non-continuous ring body.

In this embodiment, a positioning boss 62b is disposed under the pole 6b, and the positioning boss 62b is disposed in the pole setting hole 5b. The positioning boss 62b is used to position the pole 6b so that the pole 6b is accurately disposed in the pole setting hole 5b.

Further, the positioning boss 62b is adapted to the pole setting hole 5b.

In this embodiment, a seal ring 7b is disposed outside the pole setting hole 5b. The sealing ring 7b is capable of sealing the battery well to prevent battery leakage.

Further, the seal is disposed between the bottom of the inner ring body 8b and the pole setting hole 5b, and the inner ring body 8b can be matched to effectively prevent battery leakage.

In this embodiment, the tab 3b and the tab protection bracket 4b are further included. The tab 3b is electrically connected to the pole 6b. The tab protection bracket 4b is disposed under the tab 3b. The tab 3b is detachably connected. The tab protection bracket 4b can effectively prevent the tab 3b from falling, while the detachable connection makes the tab protection bracket 4b easy to install and remove.

Further, the tab protection bracket 4b is a plastic bracket.

As an embodiment, the tab protection bracket 4b is fixedly coupled to the tab 3b.

As shown in FIG. 17-22, the present application further provides a battery cover assembly, including: a cover plate 1c provided with a pole arrangement hole 4c, a pole 2c, and a tab 3c electrically connected to the pole 2c. The tab 3c includes: a protrusion 31c electrically connected to the pole 2c, and a disc body 32c extending outwardly from a lower edge of the protrusion 31c, disposed at both ends of the disc 32c The first pole strip 33c and the second pole strip 35c, the disc body 32c, the first tab strip 33c and the second tab strip 35c form the tab 3c into an I-shaped structure .

The protrusion 31c on the tab 3c and the disk body 32c, the disk body 32c are connected to the two ear strips to form the I-form structure, the tab 3c is connected to the current collector and the pole 2c, and the I-shaped ear The 3c has four extensions that effectively concentrate the current and increase the current output to the pole.

In the embodiment, a first through slot 34c and a second through slot 36c are disposed in a middle portion of the first tab bar 33c and the second tab strip 35c. The first through-groove 34c and the second through-groove 36c can fuse the first lead strip 33c and the second lead strip 35c when the current is too large, thereby protecting the battery.

Further, the disk body 32c is connected to the middle of the first pole strip 33c and the second pole strip 35c, the disk body 32c and the first pole strip 33c and the second tab Strip 35c is coupled to a current collector to conduct electricity from the current collector to the pole 2c.

In this embodiment, the protrusion 31c includes: a curved surface segment 312c and a plane segment 311c that are erected on the disk body 32c, and are disposed above the curved surface segment 312c and the planar segment 311c. The connecting plate 313c is electrically connected to the pole 2c. The plane segment 311c serves to prevent rotation, and the connecting plate 313c is for conducting electricity to the pole 2c. Since the arc segment 312c connects the two plane segments 311c, the protrusion 31c There is no hard corner structure in the outer periphery, so that the thickness of the outer peripheral wall of the protrusion 31c is uniform, and the electric conduction effect is better.

In this embodiment, the curved surface segment 312c and the planar segment 311c are integrally formed with the connecting plate 313c. One-piece molding can make the structure and performance more stable, reduce production steps, and maintain stable conductivity.

Further, the plane segment 311c is tangentially connected to the arc segment 312c, and the plane segment 311c and the arc segment 312c are smoothly transitioned to make electrical conduction more stable.

Further, the connecting plate 313c is connected with the plane segment 311c and the curved surface segment 312c in a rounded structure, and the rounded structure can make the connecting plate 313c and the plane segment 311c, the connecting plate 313c The transition to the arcuate section 312c is gently transitioned to enhance the stability of the conduction.

In this embodiment, the four corners of the first pole strip 33c and the second pole strip 35c are rounded. The rounded structure makes the tab 3c easy to install, and at the same time, the rounded structure can form a liquid injection structure to accelerate the injection of the electrolyte.

In this embodiment, the first tab strip 33c and the second tab strip 35c have a rounded structure at the junction with the disc body 32c. The joint is a rounded structure. During the production process, the rounded structure is easy to be sanded, and the rounded structure is located at the joint to form a rib structure to strengthen the joint.

Further, the rounded structures of the two joints on the same side of the disk body 32c are connected by a transition section, so that the current of the current collector is collected on the disk body 32c.

In this embodiment, the protrusion 31c, the disk body 32c, the first electrode strip 33c and the second electrode strip 35c are integrally formed. One-piece molding avoids the problem of welds affecting the conductive properties caused by welding.

In the embodiment, a positioning boss is disposed on the inner circumference of the pole setting hole 4c. The positioning boss is used to define the position of the pole 2c, so that the pole 2c is fixed more stably.

Further, a positioning structure adapted to the positioning boss is disposed under the pole 2c to cooperate with the positioning boss to position the pole 2c. When it is easy to install, the pole 2c is prevented from shaking in the pole setting hole 4c to disable the electrical connection.

In this embodiment, the positioning boss protrudes from the upper surface and the lower surface of the cover plate 1c. a portion of the positioning boss protruding from the upper surface of the cover plate 1c for supporting the pole 2c to prevent the pole 2c from falling; the positioning boss protrudes from the lower surface of the cover plate 1c A portion is used to connect the disk body 32c.

Further, the outer circumference of the pole 2c is provided with a support ring body for supporting the pole 2c supported by the positioning boss to prevent the pole 2c from falling into the battery interior. At the same time, the support ring body provides pressure for the sealing of the pole 2c, which enhances the sealing effect, and cooperates with the pole fixing assembly to prevent the pole 2c from shaking to invalidate the electrical connection.

In this embodiment, the upper surface of the connecting plate 313c and the lower surface of the pole 2c are electrically connected to the positioning boss. The connecting piece of the connecting plate 313c and the pole 2c is located in the positioning boss, and the plane segment 311c is also located in the positioning boss, which can effectively prevent the tab 3c from rotating.

Specifically, the upper surface of the connecting plate 313c and the lower surface of the positioning structure of the pole 2c are electrically connected to the positioning boss.

The foregoing is only a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application. It should be covered by the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of protection of the claims.

Claims

A battery cover having a protective structure, comprising: a cover plate, a pole disposed on the cover plate, and a tab disposed under the pole, the pole is provided with a first pass a plurality of second vent holes are disposed on the pole, and an inversion cavity and a pull piece are further disposed between the pole and the tab, and the pull piece connects the first vent hole and the first vent hole The two vent holes are detachably closed, and the pull tab is fixedly connected to the tab; the tab is provided with a break band.
A battery cover with a protective structure according to claim 1, wherein said tab is provided with a connecting hole, said pull tab is provided with a downwardly extending boss, said boss being fixedly disposed on said Connect the hole.
A battery top cover having a protective structure according to claim 2, wherein said pull tab projects downward in a tapered configuration.
A battery top cover having a protective structure according to claim 1, wherein said fracture tape is arranged in a ring shape around said connection hole.
A battery top cover having a protective structure according to claim 4, wherein said breaking belt is disposed between said second vent holes to connect said second vent holes.
A battery top cover having a protective structure according to claim 5, wherein said fracture band is a groove structure provided on said tab.
A battery top cover having a protective structure according to claim 6, wherein said groove structure has a V-shaped cross section.
A battery top cover having a protective structure according to claim 1, further comprising a protective bracket disposed under said tab.
The battery top cover with a protective structure according to claim 8, wherein the protection bracket is provided with a third vent hole.
The battery top cover with a protective structure according to claim 9, wherein the protection bracket is provided with a fastening portion, and the protection bracket is connected to the cover plate through the fastening portion.