CN218569130U

CN218569130U - Top cover assembly and battery

Info

Publication number: CN218569130U
Application number: CN202222488791.XU
Authority: CN
Inventors: 闵昌飞; 肖天丽; 黄利明
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2022-09-20
Filing date: 2022-09-20
Publication date: 2023-03-03
Anticipated expiration: 2032-09-20

Abstract

The utility model relates to a top cap subassembly and battery, this top cap subassembly includes the block, explosion-proof valve block and cylinder manifold, the block is towards the concave decompression groove that is equipped with of the direction that deviates from roll core of a side of roll core, set up the pressure release hole with the outside intercommunication of battery on the decompression groove, explosion-proof valve block lid is located on the decompression groove, explosion-proof valve block can selective shutoff decompression groove, the one end and the explosion-proof valve block of cylinder manifold are connected, the other end is used for being connected with roll core, so that the block loops through explosion-proof valve block and cylinder manifold and is connected with roll core electricity. Through being located the inside of battery with explosion-proof valve block, and then avoid explosion-proof valve block to receive influences such as external touching, extrusion and corruption to reduce the risk of explosion-proof inefficacy when taking place the short circuit. Meanwhile, the explosion-proof valve plate is communicated with a circuit, when a short circuit occurs, the high temperature on the explosion-proof valve plate can promote the fusing of the fracture part, so that the inside and the outside of the battery can be smoothly communicated to realize pressure relief.

Description

Top cover assembly and battery

Technical Field

The utility model relates to the technical field of batteries, especially, relate to a top cap subassembly and contain battery of this top cap subassembly.

Background

With the rapid development of new energy power, batteries have become the main direction of electric vehicle development. The existing battery comprises a cylindrical shell, one end of the shell is open, the open end of the shell is provided with a top cover assembly, a winding core for generating electric energy is installed inside the shell, and electrolyte is filled in the winding core. The positive tab on the winding core is connected with the top cover assembly, the negative tab on the winding core is connected with the shell, and the external power utilization equipment can form an electric loop through connection with the top cover assembly and the bottom of the shell. In order to ensure the safety of the battery, an explosion-proof structure is usually arranged on the outer side of the shell or the outer side of the top cover assembly, and when the battery is short-circuited, the gas generated in the battery can break the explosion-proof structure to realize pressure relief to the outside of the battery, so that the explosion of the whole battery is avoided. The prior art has the following defects: because current explosion-proof structure sets up in the outside of battery, in the use of battery, when explosion-proof structure is receiving external touching, extrusion, corruption etc. influence, cause the unable smooth pressure release of explosion-proof structure easily, have great explosion-proof risk of becoming invalid.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a top cap subassembly, it can avoid explosion-proof valve block to receive external influence, reduces explosion-proof inefficacy risk.

Another object of the present invention is to provide a battery, which has high reliability in explosion-proof and pressure relief.

To achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides a pair of top cap subassembly for install the one end at battery case, install the book core in the casing, top cap subassembly includes block, explosion-proof valve block and converges the dish, the block orientation roll up one side of core to deviating from the direction of book core is concave to be equipped with the pressure release groove, set up on the pressure release groove with the pressure release hole of the outside intercommunication of battery, explosion-proof valve block lid is located on the pressure release groove, explosion-proof valve block can the shutoff of selectivity pressure release groove, converge the dish one end with explosion-proof valve block is connected, the other end be used for with roll up the core and connect, so that the block loops through explosion-proof valve block with converge the dish with roll up the electricity and be connected.

Furthermore, the pressure relief holes are multiple, and are arranged on the groove wall of the pressure relief groove at intervals along the circumferential direction of the pressure relief groove.

Furthermore, the groove wall of the pressure relief groove is inclined towards the axial direction of the pressure relief groove from one end close to the groove opening to one end close to the groove bottom, the pressure relief hole is formed in the groove wall, and the axial direction of the pressure relief hole is perpendicular to the extending direction of the groove wall.

Furthermore, be provided with the nick that is closed shape on the explosion-proof valve block, when the inside atmospheric pressure of battery surpassed the setting value, be located inside the nick the explosion-proof valve block with be located outside the nick the explosion-proof valve block separation.

Further, an orthographic projection of the nick on the cap is positioned inside the pressure relief groove.

Further, the cross section of the nick is one of triangular, semicircular, trapezoidal or rectangular.

Furthermore, the confluence disc comprises a bending plate, and a first connecting portion and a second connecting portion which are respectively arranged at two ends of the bending plate, wherein the first connecting portion is connected with the anti-explosion valve plate positioned inside the nick, the second connecting portion is used for being connected with the winding core, and the bending plate can be repeatedly bent and arranged, so that the first connecting portion and the second connecting portion are elastically connected through the bending plate.

Further, the first connecting portions and the second connecting portions are distributed at intervals along the axis direction of the winding core.

Further, the top cover assembly further comprises a circular ring-shaped sealing ring, a first mounting groove is concavely formed in the side face of the inner ring of the sealing ring, a notch of the first mounting groove faces the center of the sealing ring, and the periphery of the cover cap and the periphery of the explosion-proof valve plate are inserted into the first mounting groove.

Further, the explosion-proof valve block includes integrated into one piece's valve block bottom plate, valve block roof and connecting plate, the valve block roof is ring shape, the outer loop end of valve block roof pass through the connecting plate with week portion of valve block bottom plate is connected, so that enclose between the valve block bottom plate the connecting plate with the valve block roof and establish and form the second mounting groove, week portion of block with the second mounting groove is pegged graft.

Further, the block includes integrated into one piece's terminal portion and shrouding portion, the pressure relief groove set up in the terminal portion, shrouding portion cover is located the terminal portion is close to roll up the one end of core, along the axis direction of battery, the terminal portion deviates from roll up the terminal surface of core with the interval between the shrouding portion is 1-4mm.

Still provide a battery, including foretell top cap subassembly to and casing and book core, the casing has one end open-ended and holds the chamber, it installs to roll up the core hold the intracavity, top cap subassembly set up in the open end of casing, and make top cap subassembly can the shutoff the opening, converge the dish with the utmost point ear of rolling up the core is connected.

Furthermore, the containing cavity deviates from one end of the opening and is provided with a current collecting disc, and the winding core is electrically connected with the shell through the current collecting disc.

Further, the top cover assembly further comprises a sealing ring, the sealing ring is provided with a notch facing to a first mounting groove in the center of the sealing ring, the cap and the periphery of the explosion-proof valve plate are all connected with the first mounting groove in an inserting mode, the shell is provided with a third mounting groove, the notch of the third mounting groove faces to the center of the shell, and the sealing ring is inserted into the third mounting groove.

Further, the battery still includes insulating pad, insulating pad's one end clamp is located the casing with roll up between the core, insulating pad's the other end clamp is located the casing with between the sealing washer.

The utility model discloses compare in prior art's beneficial effect:

the utility model discloses a top cap subassembly and battery, this top cap subassembly is through setting up explosion-proof valve block in the side of block orientation book core, and explosion-proof valve block is located the inside of battery promptly, and then avoids explosion-proof valve block to receive influences such as external touching, extrusion and corruption to reduce the risk of explosion-proof inefficacy when taking place the short circuit. Meanwhile, the explosion-proof valve plate is communicated with a circuit, when a short circuit occurs, the high temperature on the explosion-proof valve plate can promote the fusing of the fracture part, so that the inside and the outside of the battery can be smoothly communicated to realize pressure relief. Therefore, the top cover assembly is beneficial to improving the explosion-proof reliability of the battery.

Drawings

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

Fig. 2 is a cross-sectional view of a battery according to an embodiment of the present invention.

Fig. 3 is a cross-sectional view of a cap assembly in accordance with an embodiment of the present invention.

Fig. 4 is an enlarged view of a portion a in fig. 3.

Fig. 5 is a schematic view of a cap according to an embodiment of the present invention.

Fig. 6 is a schematic diagram of the confluence disc of the embodiment of the present invention.

Fig. 7 is a sectional view of the explosion-proof valve plate according to the embodiment of the present invention.

Fig. 8 is a partial cross-sectional view of a housing according to an embodiment of the present invention.

In the figure:

1. capping; 10. a pressure relief groove; 11. a terminal portion; 12. a sealing plate portion; 13. a pressure relief vent; 2. an explosion-proof valve plate; 21. a valve plate bottom plate; 22. a valve plate top plate; 23. a connecting plate; 24. scoring; 25. a second mounting groove; 3. a confluence disc; 31. a first connection portion; 32. a second connecting portion; 33. bending the plate; 4. a seal ring; 5. a housing; 51. an accommodating chamber; 52. a second bent portion; 53. a third mounting groove; 6. a winding core; 7. an insulating pad; 8. a collector plate.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner.

As shown in fig. 1 to 4, the present invention provides a top cap assembly for being mounted on a housing 5 of a battery, and the top cap assembly is located at an end of the battery. The top cover assembly comprises a cover cap 1, an explosion-proof valve plate 2, a bus disc 3 and a sealing ring 4. The battery is including being cylindrical casing 5 and rolling up core 6, rolls up core 6 and is used for turning into the electric energy with chemical energy, and casing 5 is hollow structure, rolls up core 6 and installs in the inside of casing 5. The top cover assembly plays a role in connecting the winding core 6 with external electric equipment, and output or input of electric energy is realized. The cap 1, the explosion-proof valve plate 2 and the bus disc 3 are all made of conductive metal materials, the cap 1 is located at the end of the shell 5, and the cap 1 is used for being directly electrically connected with external electric equipment. Explosion-proof valve block 2 sets up at 1 inside side of block towards the battery, and the concave pressure relief groove 10 that is equipped with on the block 1, the notch orientation of pressure relief groove 10 lies in the inside book core 6 of battery. The pressure relief groove 10 is provided with a pressure relief hole 13, and the pressure relief hole 13 penetrates through the side surface of the cap 1 facing the inside of the battery and the side surface facing the outside of the battery, so that the pressure relief groove 10 is communicated with the outside of the battery through the pressure relief hole 13. The explosion-proof valve plate 2 is covered on the notch of the pressure relief groove 10, and the pressure relief groove 10 can be selectively plugged by the explosion-proof valve plate 2. It can be understood that the explosion-proof valve plate 2 is used for explosion-proof pressure relief, the explosion-proof valve plate 2 can selectively communicate the inside and the outside of the battery, that is, the explosion-proof valve plate 2 has a closed state and a conducting state, when the battery is in the closed state, the explosion-proof valve plate 2 blocks a communication channel between the inside and the outside of the battery, that is, blocks a notch of the pressure relief groove 10, so that the inside of the whole battery is a sealed space; when the on-state, roll up core 6 and rise and produce a large amount of gas because of taking place the short circuit temperature, when atmospheric pressure exceeded the setting value, atmospheric pressure made explosion-proof valve block 2 take place to drop or break to make the inside and the outside intercommunication of battery, the inside a large amount of gas passes through pressure release hole 13 and discharges, realizes explosion-proof pressure release. The one end of disc 3 that converges is connected with explosion-proof valve block 2, and the other end is used for rolling up core 6 with the battery and being connected for block 1 loops through explosion-proof valve block 2 and disc 3 that converges and roll up core 6 electricity and be connected. The sealing ring 4 has good sealing performance and insulating performance, the cover cap 1 and/or the explosion-proof valve plate 2 are/is arranged on the shell 5, and the sealing ring 4 is positioned between the shell 5 and the cover cap 1 and/or the explosion-proof valve plate 2 so as to ensure the mounting sealing performance of the top cover assembly and ensure the insulating connection between the cover cap 1 and the explosion-proof valve plate 2 and the shell 5. In this embodiment, through setting up explosion-proof valve block 2 at block 1 side towards roll core 6, explosion-proof valve block 2 is located the inside of battery promptly, and then avoids explosion-proof valve block 2 to receive influences such as external touching, extrusion and corruption to reduce the risk of explosion-proof inefficacy when taking place the short circuit. Meanwhile, as the explosion-proof valve plate 2 is communicated with a circuit, when a short circuit occurs, the high temperature on the explosion-proof valve plate 2 can promote the fusing of the fracture part, so that the inside and the outside of the battery can be smoothly communicated to realize the pressure relief. Therefore, the top cover assembly is beneficial to improving the explosion-proof reliability of the battery.

Alternatively, as shown in fig. 3 and 5, the cap 1 includes the terminal portion 11 and the sealing plate portion 12 which are integrally formed, the terminal portion 11 is located in the middle of the sealing plate portion 12, and the terminal portion 11, the sealing plate portion 12 and the case 5 are coaxial. The cover portion 12 is located at an end of the terminal portion 11 close to the winding core 6, so that an end of the terminal portion 11 away from the winding core 6 protrudes from a surface of the cover portion 12, so as to connect the terminal portion 11 with an external electric device. The distance between the end surface of the terminal part, which faces away from the winding core 6, and the sealing plate part 12 is 1-4mm in the axial direction of the battery, and it can also be understood that the terminal part 11 protrudes 1-4mm from the surface of the sealing plate part 12. The pressure relief groove 10 is provided on a side surface of the terminal portion 11 facing the winding core 6, the pressure relief hole 13 is provided in a wall of the pressure relief groove 10, and the pressure relief hole 13 communicates with the outside of the battery. The number of the pressure relief holes 13 is plural, and the plural pressure relief holes 13 are distributed at intervals along the circumferential direction of the pressure relief groove 10. In this embodiment, the number of the pressure release holes 13 is 3 to 12. It is understood that the size and number of the pressure relief holes 13 are related to the pressure relief efficiency, and therefore, in practical applications, the number of the pressure relief holes 13 and the size of the hole diameter can be adaptively selected according to the theoretical discharge rate of the gas.

Optionally, the groove wall of the pressure relief groove 10 is inclined from the end close to the groove opening to the end close to the groove bottom toward the axis direction of the pressure relief groove 10, and this structure makes the pressure relief groove 10 in the shape of a large groove opening with a small bottom, so as to facilitate the integral forming process of the cap 1. It will be appreciated that the groove walls of the pressure relief groove 10 extend at an angle to both the axial and radial directions of the cell. The pressure relief hole 13 is formed in a groove wall of the pressure relief groove 10, and an axial direction of the pressure relief hole 13 is perpendicular to an extending direction of the groove wall of the pressure relief groove 10. This structure makes the axis direction of pressure release hole 13 all be the contained angle with the axial of battery and radially. During explosion-proof pressure relief, gas is ejected along the axial direction of the pressure relief hole 13, and the electrolyte in the battery is ejected together with the gas. By inclining the pressure relief hole 13 in the axial direction and the radial direction relative to the battery, the ejected gas and the electrolyte are ejected to the obliquely upper side of the battery, and the influence on the adjacent battery in the battery module is reduced.

Optionally, referring to fig. 3 and 7, the explosion-proof valve plate 2 includes a valve plate bottom plate 21, a valve plate top plate 22, and a connecting plate 23, which are integrally formed, the valve plate bottom plate 21 is disc-shaped, the valve plate top plate 22 is ring-shaped, an outer ring end of the valve plate top plate 22 is connected to a peripheral portion of the valve plate bottom plate 21 through the connecting plate 23, so that a second mounting groove 25 is defined among the valve plate bottom plate 21, the connecting plate 23, and the valve plate top plate 22, and the peripheral portion of the cap 1 is inserted into the second mounting groove 25. In this embodiment, the valve sheet bottom plate 21 abuts against one side surface of the sealing plate portion 12 of the cap 1 facing the inside of the battery, the valve sheet top plate 22 abuts against one side surface of the sealing plate portion 12 of the cap 1 facing the outside of the battery, and the peripheral portion of the sealing plate portion 12 is inserted into the second mounting groove 25, so as to fix the valve sheet bottom plate and the cap 1 and ensure reliable electrical connection therebetween.

The valve plate bottom plate 21 of the explosion-proof valve plate 2 is positioned on one side surface of the cover cap 1 facing the inside of the battery, namely the valve plate bottom plate 21 is used for blocking the pressure relief groove 10. The bottom plate 21 is provided with a notch 24, and the notch 24 is in a closed shape, such as a square, a rectangle, a circle, a triangle, a polygon, and the like. In this embodiment, the score 24 is circular. When the air pressure inside the battery exceeds a set value, the air inside the battery impacts the valve sheet bottom plate 21, and the valve sheet bottom plate 21 inside the notch 24 is separated from the valve sheet bottom plate 21 outside the notch 24. It is understood that the closed-shaped notch 24 can divide the vent panel 2 into two parts, i.e., a part located inside the notch 24 and a part located outside the notch 24. The cross-sectional shape of the score 24 includes, but is not limited to, triangular, semi-circular, trapezoidal, or rectangular, in this embodiment, the score 24 is semi-circular. It can also be understood that the notch 24 is a notch formed on the rupture disk 2, so that the rupture disk 2 at the notch has reduced strength. When the explosion-proof valve plate 2 is impacted by gas, the notch 24 of the explosion-proof valve plate 2 is broken, so that the inside and the outside of the battery are communicated through the pressure relief hole 13. In this embodiment, because the block 1, the explosion-proof valve block 2 and the confluence disc 3 form an electric path, when a short-circuit accident occurs, the temperature of the explosion-proof valve block 2 rises sharply, and the notch 24 is easily heated and fused, so as to ensure that the explosion-proof valve block 2 can be smoothly broken to realize explosion-proof pressure relief when pressure relief is needed.

The orthographic projection of the score 24 on the cap 1 is located inside the pressure relief groove 10. When a large amount of gas is generated inside the battery, the gas impacts the explosion-proof valve plate 2 and breaks the explosion-proof valve plate 2, the broken explosion-proof valve plate 2 moves into the pressure relief groove 10, and meanwhile, the gas enters the pressure relief groove 10 and is discharged through the pressure relief hole 13.

Optionally, referring to fig. 3 and 6, the bus bar tray 3 includes a first connecting portion 31, a second connecting portion 32 and a bent plate 33, the first connecting portion 31 and the second connecting portion 32 are respectively disposed at two ends of the bent plate 33, the first connecting portion 31 is connected to the explosion-proof valve sheet 2, and the second connecting portion 32 is used for being connected to the positive tab of the winding core 6. Before the battery is assembled, the bending plate 33 is straight, so that the processing is convenient and the assembly process is adapted; when the battery is assembled, the bending plate 33 is bent, so that the bending plate 33 is bent to be in an "S" shape or a "U" shape, and the first connecting portion 31 and the second connecting portion 32 can be distributed at intervals along the axial direction of the battery to adapt to the space structure of the whole battery. The axial direction of the battery is also the axial direction of the winding core. In this embodiment, the bending plate 33 can be repeatedly bent and bent to form an "S" shape, so that the first connecting portion 31 and the second connecting portion 32 are elastically connected through the bending plate 33, and the bending plate 33 is bent to form an "S" shape and then is made to have elasticity. The explosion-proof valve plate 2 located inside the notch 24 is concavely arranged towards the direction of the inside of the battery, so that the first connecting part 31 of the bus bar 3 is connected to the sunken area of the explosion-proof valve plate 2 for installation and connection. When explosion-proof pressure relief is needed, the explosion-proof valve plate 2 in the nick 24 is broken and falls off, and the separated explosion-proof valve plate 2 stretches the bending plate 33 and moves towards the inside of the pressure relief groove 10. Therefore, the bending structure of the bending plate 33 can avoid the obstruction to the falling of the explosion-proof valve plate 2.

Optionally, referring to fig. 3 and 4, the sealing rings 4 are circular rings, and the cap 1 and the housing 5 and the explosion-proof valve plate 2 and the housing 5 are separated by the sealing rings 4 to avoid short circuit of the battery. The side of the inner ring of the sealing ring 4 is concavely provided with a first mounting groove, and the notch of the first mounting groove faces to the center of the sealing ring 4. The peripheral part of the cover cap 1 and the peripheral part of the explosion-proof valve plate 2 are inserted into the first mounting groove. The seal ring 4 has good sealing properties and insulation properties, such as PEP material (copolymer of polyethylene glycol and propylene oxide). In this embodiment, the peripheral portion of the cap 1 is inserted into the second mounting groove 25 of the explosion-proof valve plate 2, and the peripheral portion of the explosion-proof valve plate 2 is inserted into the first mounting groove of the sealing ring 4. Of course, in another embodiment, the valve sheet top plate 22 and the connecting plate 23 in the explosion-proof valve sheet 2 may be eliminated, and the sealing plate portion 12 and the valve sheet bottom plate 21 of the cap 1 are stacked and the peripheral portions of the two are directly inserted into the first mounting groove.

The remarkable effects of the embodiment are as follows: through setting up explosion-proof valve block 2 at block 1 towards the side of rolling up core 6, explosion-proof valve block 2 is located the inside of battery promptly, and then avoids explosion-proof valve block 2 to receive influences such as external touching, extrusion and corruption to reduce the risk of explosion-proof inefficacy when taking place the short circuit. Meanwhile, as the explosion-proof valve plate 2 is communicated with a circuit, when a short circuit occurs, the high temperature on the explosion-proof valve plate 2 can promote the fusing of the fracture part, so that the inside and the outside of the battery can be smoothly communicated to realize the pressure relief. Therefore, the top cover assembly is beneficial to improving the explosion-proof reliability of the battery.

The utility model discloses still provide a battery, it is shown with fig. 1 and fig. 2 to refer to, including casing 5, roll up core 6 and foretell top cap subassembly. The shell 5 is a cylindrical barrel structure, the shell 5 has a containing cavity 51 with an opening at one end, the winding core 6 is installed in the containing cavity 51 of the shell 5, and the containing cavity 51 is filled with electrolyte. The top cover assembly is mounted on the opening end of the case 5 and is capable of sealing the opening of the case 5, so that the inside of the entire battery is sealed. The bus-bar disc 3 in the top cover assembly is connected with the positive lug of the winding core 6, so that the top cover assembly forms the positive pole of the battery. The end, deviating from the top cover assembly, of the winding core 6 is provided with a current collecting disc 8, the negative electrode tab of the winding core 6 is welded on the current collecting disc 8, the current collecting disc 8 is located at the end, deviating from the opening, of the containing cavity, the current collecting disc 8 is connected with the shell 5, the winding core 6 is electrically connected with the shell 5 through the current collecting disc 8, and the shell 5 forms a negative electrode of the battery.

Alternatively, as shown with reference to fig. 3, 4 and 8, the case 5 includes a case body and first and second bent portions 52 extending toward the center of the battery, the case body, the first and second bent portions 52 being integrally molded. The first bending part is U-shaped, the opening of the first bending part faces the outside of the battery, the second bending part 52 is spaced from the first bending part, the second bending part 52 is located at the end of the shell body, and a third mounting groove 53 is formed between the first bending part, the second bending part 52 and the shell body, i.e. the third mounting groove 53 is located at the end of the shell 5. The notch of the third mounting groove 53 faces the center of the housing 5, and the sealing ring 4 is inserted into the third mounting groove 53, so as to realize the mounting and fixing between the top cover assembly and the housing 5. Through set up third mounting groove 53 on casing 5 to peg graft in third mounting groove 53 with the week portion of block 1, the week portion of explosion-proof valve block 2 and sealing washer 4, this structure has good sealing performance, avoids the inside electrolyte seepage of battery. The end of the housing 5 facing away from the head assembly is of smooth planar construction for connection to a cooling system.

The battery also comprises an insulating pad 7, one end of the insulating pad 7 is clamped between the shell 5 and the winding core 6, and the other end of the insulating pad 7 is clamped between the shell 5 and the sealing ring 4. The insulating pad 7 has good insulating properties, and the insulating pad 7 may be made of a PP (polypropylene) material for preventing the winding core 6 and the bus tray 3 located inside the case 5 from contacting the case 5. Referring to fig. 4, it can be seen that one end of the insulating gasket 7 is sandwiched between the end of the winding core 6 close to the top cover assembly and the shell 5, and the other end extends toward the top cover assembly and is sandwiched between the seal ring 4 and the shell 5.

The total length of the battery is 65-130mm, and the diameter of the battery is 30-65mm.

The battery in this embodiment is because set up explosion-proof valve block 2 inside the battery, and then avoids explosion-proof valve block 2 to receive influences such as external touching, extrusion and corruption to reduce the risk of explosion-proof inefficacy when taking place the short circuit, the reliability of explosion-proof pressure release is higher. Due to the provision of the sealing ring 4 and the insulating gasket 7. The insulating mat 7 serves as a conductive part inside the battery and is spaced from the case 5 to prevent short-circuiting. The sealing ring 4 plays a role in sealing and insulating the top cover assembly, on one hand, the positively charged top cover 1 and the explosion-proof valve plate 2 are separated from the negatively charged shell 5, on the other hand, the sealing effect on the top cover assembly is achieved, and the leakage accident of the battery is avoided.

The above description is only for the preferred embodiment of the present invention, and for those skilled in the art, there are variations on the detailed description and the application scope according to the idea of the present invention, and the content of the description should not be construed as a limitation to the present invention.

Claims

1. The utility model provides a top cap subassembly for install the one end at battery case, install roll up the core in the casing, its characterized in that, top cap subassembly includes block, explosion-proof valve block and converges the dish, the block orientation roll up a side of core to deviating from the direction of rolling up the core is concave to be equipped with the pressure release groove, set up on the pressure release groove with the pressure release hole of the outside intercommunication of battery, explosion-proof valve block lid is located on the pressure release groove, explosion-proof valve block can the shutoff of selectivity the pressure release groove, converge the dish one end with explosion-proof valve block is connected, the other end be used for with roll up the core and connect, so that the block loops through explosion-proof valve block with converge the dish with roll up the core electricity and be connected.

2. The header assembly of claim 1, wherein the pressure relief vent is a plurality of pressure relief vents, and the plurality of pressure relief vents are spaced apart from one another along a circumferential direction of the pressure relief groove.

3. The header assembly of claim 1, wherein the walls of the pressure relief slots are inclined from an end adjacent the notch to an end adjacent the bottom of the slot toward the axis of the pressure relief slots, and the pressure relief holes are formed in the walls of the slots such that the axis of the pressure relief holes is perpendicular to the direction of extension of the walls of the slots.

4. The top cover assembly of claim 1, wherein the vent panel is provided with a notch in a closed shape, and when the air pressure inside the battery exceeds a set value, the vent panel inside the notch is separated from the vent panel outside the notch.

5. The cap assembly of claim 4, wherein an orthographic projection of the score on the cap is located inside the vent groove.

6. The header assembly of claim 4, wherein the score has a cross-section that is one of triangular, semi-circular, trapezoidal, or rectangular.

7. The top cover assembly according to claim 4, wherein the confluence disc comprises a bending plate and a first connecting portion and a second connecting portion respectively arranged at two ends of the bending plate, the first connecting portion is connected with the explosion-proof valve plate located inside the notch, the second connecting portion is used for being connected with the winding core, the bending plate can be repeatedly bent and arranged, and the first connecting portion and the second connecting portion are elastically connected through the bending plate.

8. The header assembly of claim 7, wherein the first and second coupling portions are spaced apart along an axis of the winding core.

9. The top cover assembly according to claim 1, further comprising a ring-shaped sealing ring, wherein a first mounting groove is concavely formed in the inner ring side surface of the sealing ring, a notch of the first mounting groove faces the center of the sealing ring, and the peripheral portion of the cover cap and the peripheral portion of the explosion-proof valve plate are inserted into the first mounting groove.

10. The top cover assembly according to claim 9, wherein the explosion-proof valve plate comprises a valve plate bottom plate, a valve plate top plate and a connecting plate which are integrally formed, the valve plate top plate is annular, an outer ring end of the valve plate top plate is connected with the periphery of the valve plate bottom plate through the connecting plate, so that a second mounting groove is formed among the valve plate bottom plate, the connecting plate and the valve plate top plate in a surrounding mode, and the periphery of the cap is connected with the second mounting groove in an inserting mode.

11. The top cap assembly according to any one of claims 1 to 10, wherein the cap comprises a terminal portion and a sealing plate portion, the terminal portion is integrally formed, the pressure relief groove is formed in the terminal portion, the sealing plate portion is sleeved on one end of the terminal portion close to the winding core, and the distance between the end surface of the terminal portion (11) facing away from the winding core and the sealing plate portion is 1-4mm in the axial direction of the battery.

12. A battery comprising the cap assembly of any one of claims 1 to 11, a case having a receiving cavity with an opening at one end, and a winding core mounted in the receiving cavity, wherein the cap assembly is disposed at the opening end of the case and enables the cap assembly to close the opening, and wherein the bus tray is connected to a tab of the winding core.

13. The cell defined in claim 12, wherein an end of the cavity facing away from the opening is provided with a current collector disc, and the winding core is electrically connected to the case through the current collector disc.

14. The battery of claim 12, wherein the top cap assembly further comprises a sealing ring, the sealing ring is provided with a first mounting groove with a notch facing the center of the sealing ring, the peripheral portions of the cap and the explosion-proof valve plate are inserted into the first mounting groove, the housing is provided with a third mounting groove with a notch facing the center of the housing, and the sealing ring is inserted into the third mounting groove.

15. The battery of claim 14, further comprising an insulating gasket, one end of the insulating gasket sandwiched between the can and the jelly roll and the other end of the insulating gasket sandwiched between the can and the sealing ring.