CN218569130U - Top cover assembly and battery - Google Patents

Abstract

The utility model relates to a top cover assembly and a battery. The top cover assembly includes a cap, an explosion-proof valve plate and a confluence plate. The side of the cap facing the winding core is concavely provided with a pressure relief groove facing away from the winding core. There is a pressure relief hole connected to the outside of the battery. The explosion-proof valve cover is set on the pressure relief groove. The explosion-proof valve can selectively block the pressure relief groove. One end of the manifold is connected to the explosion-proof valve, and the other end is used to The winding core is connected so that the cap is electrically connected to the winding core through the explosion-proof valve plate and the confluence plate in turn. By placing the explosion-proof valve inside the battery, the explosion-proof valve is prevented from being affected by external touch, extrusion and corrosion, so as to reduce the risk of explosion-proof failure in the event of a short circuit. At the same time, because the explosion-proof valve plate is connected to the circuit, when a short circuit occurs, the high temperature on the explosion-proof valve plate will promote the fusing of the fracture, so that the inside and outside of the battery can be smoothly conducted to realize pressure relief.

Description

Top cover assembly and battery

technical field

The utility model relates to the technical field of batteries, in particular to a top cover assembly and a battery including the top cover assembly.

Background technique

With the rapid development of new energy power, batteries have become the main direction of electric vehicle development. The existing battery includes a cylindrical shell with an opening at one end, and a top cover assembly is provided at the open end of the shell. A winding core for generating electric energy is installed inside the shell and filled with electrolyte. The positive lug on the winding core is connected to the top cover assembly, the negative pole lug on the winding core is connected to the casing, and the external electrical equipment can form an electrical circuit through the connection with the top cover assembly and the bottom of the casing. In order to ensure the safety of the battery, an explosion-proof structure is usually provided on the outside of the casing or the top cover assembly. When the battery is short-circuited, the gas generated inside it can rupture the explosion-proof structure and release the pressure to the outside of the battery, preventing the entire battery from being damaged. explosion occurs. The prior art has the following deficiencies: since the existing explosion-proof structure is arranged outside the battery, during the use of the battery, when the explosion-proof structure is affected by external touch, extrusion, corrosion, etc., it is easy to cause the explosion-proof structure to fail to operate smoothly. Pressure relief, there is a greater risk of explosion-proof failure.

Utility model content

One purpose of the present utility model is to provide a top cover assembly, which can prevent the explosion-proof valve plate from being affected by the outside world and reduce the risk of explosion-proof failure.

Another purpose of the utility model is to provide a battery with high reliability of explosion-proof and pressure-relieving.

For this purpose, the utility model adopts the following technical solutions:

A top cover assembly is provided, which is used to be installed at one end of the battery casing, and a winding core is installed in the casing, and the top cover assembly includes a cap, an explosion-proof valve plate and a manifold, and the cap faces the winding core A pressure relief groove is recessed on one side of the side facing away from the winding core, and a pressure relief hole communicating with the outside of the battery is opened on the pressure relief groove, and the explosion-proof valve cover is arranged on the pressure relief groove. On the groove, the explosion-proof valve plate can selectively block the pressure relief groove, one end of the manifold is connected to the explosion-proof valve plate, and the other end is used to connect with the winding core, so that the cap is sequentially It is electrically connected with the winding core through the explosion-proof valve plate and the manifold.

Further, there are a plurality of pressure relief holes, and the plurality of pressure relief holes are arranged at intervals on the groove wall of the pressure relief groove along the circumferential direction of the pressure relief groove.

Further, the groove wall of the pressure relief groove is inclined toward the axial direction of the pressure relief groove from one end close to the notch to one end close to the bottom of the groove, the pressure relief hole is opened on the groove wall, and makes The axial direction of the pressure relief hole is perpendicular to the extending direction of the groove wall.

Further, the explosion-proof valve plate is provided with a closed score, when the air pressure inside the battery exceeds the set value, the explosion-proof valve plate inside the score and the outside of the score The explosion-proof valve plate is separated.

Further, the orthographic projection of the notch on the cap is located inside the pressure relief groove.

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

Further, the manifold includes a bent plate and a first connecting portion and a second connecting portion respectively arranged at both ends of the bent plate, the first connecting portion is connected to the explosion-proof valve located inside the notch. The sheet is connected, the second connecting part is used to connect with the winding core, the bent plate can be bent and set repeatedly, and the first connecting part and the second connecting part pass through the bent plate Elastic connection.

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

Further, the top cover assembly also includes a ring-shaped sealing ring, the inner ring side of the sealing ring is recessed with a first installation groove, and the notch of the first installation groove faces the center of the sealing ring , the peripheral portion of the cap and the peripheral portion of the explosion-proof valve plate are both inserted into the first installation groove.

Further, the explosion-proof valve plate includes an integrally formed valve plate bottom plate, a valve plate top plate and a connecting plate, the valve plate top plate is circular, and the outer ring end of the valve plate top plate is connected to the valve plate through the connecting plate. The periphery of the bottom plate is connected so that a second installation groove is formed between the valve plate bottom plate, the connecting plate and the valve plate top plate, and the periphery of the cap is inserted into the second installation groove.

Further, the cap includes an integrally formed terminal portion and a sealing plate portion, the pressure relief groove is provided on the terminal portion, and the sealing plate portion is sleeved on an end of the terminal portion close to the winding core, along the In the axial direction of the battery, the distance between the end surface of the terminal portion away from the winding core and the sealing plate portion is 1-4mm.

There is also provided a battery, including the above-mentioned top cover assembly, a casing and a winding core, the casing has an accommodating chamber with one end open, the winding core is installed in the accommodating chamber, and the top cover assembly is arranged on The open end of the casing, and enables the top cover assembly to block the opening, and the collector plate is connected to the lug of the winding core.

Further, a collector plate is provided at the end of the accommodation chamber away from the opening, and the winding core is electrically connected to the casing through the collector plate.

Further, the top cover assembly also includes a sealing ring, and the sealing ring is provided with a first installation groove with a notch facing the center of the sealing ring, and the periphery of the cap and the explosion-proof valve plate are both connected to the first installation groove. A mounting slot is plugged in, the housing is provided with a third mounting slot, the notch of the third mounting slot faces the center of the housing, and the sealing ring is inserted into the third mounting slot.

Further, the battery further includes an insulating pad, one end of the insulating pad is interposed between the casing and the winding core, and the other end of the insulating pad is sandwiched between the casing and the sealing between circles.

Compared with the beneficial effects of the prior art, the utility model has the following advantages:

The utility model relates to a top cover assembly and a battery. The top cover assembly arranges the explosion-proof valve plate on the side of the cap facing the winding core, that is, the explosion-proof valve plate is located inside the battery, thereby preventing the explosion-proof valve plate from being touched by the outside world. , extrusion and corrosion to reduce the risk of explosion-proof failure in the event of a short circuit. At the same time, because the explosion-proof valve plate is connected to the circuit, when a short circuit occurs, the high temperature on the explosion-proof valve plate will promote the fusing of the fracture, so that the inside and outside of the battery can be smoothly conducted to realize pressure relief. Therefore, the top cover assembly is beneficial to improve the explosion-proof reliability of the battery.

Description of drawings

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

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

Fig. 3 is a cross-sectional view of the top cover assembly of the embodiment of the present invention.

Fig. 4 is an enlarged view of A in Fig. 3 .

Fig. 5 is a schematic diagram of the cap of the embodiment of the present invention.

Fig. 6 is a schematic diagram of a confluence plate according to an embodiment of the present invention.

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

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

In the picture:

1. Cap; 10. Pressure relief groove; 11. Terminal part; 12. Sealing plate part; 13. Pressure relief hole; 2. Explosion-proof valve plate; 21. Valve plate bottom plate; 22. Valve plate top plate; 23. Connection plate; 24. Notch; 25. Second installation groove; 3. Confluence plate; 31. First connection part; 32. Second connection part; 33. Bending plate; 4. Sealing ring; 5. Housing; 51. Accommodating cavity; 52, the second bending part; 53, the third installation groove; 6, the winding core; 7, the insulating pad; 8, the collecting plate.

Detailed ways

In order to make the technical problem solved by the utility model, the adopted technical solution and the achieved technical effect clearer, the technical solution of the utility model will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

As shown in Fig. 1 to Fig. 4, the utility model provides a top cover assembly, which is used to be installed on the casing 5 of the battery, and the top cover assembly is located at the end of the battery. The top cover assembly includes a cap 1 , an explosion-proof valve plate 2 , a manifold 3 and a sealing ring 4 . The battery includes a cylindrical casing 5 and a winding core 6 , the winding core 6 is used to convert chemical energy into electrical energy, the casing 5 is a hollow structure, and the winding core 6 is installed inside the casing 5 . The top cover assembly acts as a connection between the winding core 6 and external electrical equipment to realize the output or input of electric energy. The cap 1, the explosion-proof valve plate 2 and the confluence plate 3 are all made of conductive metal material, the cap 1 is located at the end of the housing 5, and the cap 1 is used for direct electrical connection with external electrical equipment. The explosion-proof valve plate 2 is arranged on the side of the cap 1 facing the inside of the battery, and the cap 1 is concavely provided with a pressure relief groove 10, and the notch of the pressure relief groove 10 faces the winding core 6 inside the battery. The pressure relief groove 10 is provided with a pressure relief hole 13 , and the pressure relief hole 13 runs through the side of the cap 1 facing the inside of the battery and the side facing the outside of the battery, so that the pressure relief groove 10 communicates 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 enables the explosion-proof valve plate 2 to selectively block the pressure relief groove 10. It can be understood that the explosion-proof valve plate 2 is used for explosion-proof pressure relief, and the explosion-proof valve plate 2 can selectively connect the inside of the battery with the outside, that is, the explosion-proof valve plate 2 has a closed state and a conduction state. In the closed state, the explosion-proof valve plate 2. Block the communication channel between the inside and the outside of the battery, that is, block the notch of the pressure relief groove 10, so that the inside of the entire battery is a sealed space; when it is in a conductive state, the temperature of the winding core 6 will rise due to a short circuit And produce a large amount of gas, when the air pressure exceeds the set value, the air pressure causes the explosion-proof valve plate 2 to fall off or rupture, so that the inside of the battery is connected with the outside, and a large amount of gas inside is discharged through the pressure relief hole 13 to realize explosion-proof pressure relief. One end of the manifold 3 is connected to the explosion-proof valve plate 2, and the other end is used to connect to the winding core 6 of the battery, so that the cap 1 is electrically connected to the winding core 6 through the explosion-proof valve plate 2 and the manifold 3 in turn. The sealing ring 4 has good sealing and insulation properties. The cap 1 and/or the explosion-proof valve plate 2 are installed on the shell 5, and the sealing ring 4 is located between the shell 5 and the cap 1 and or the explosion-proof valve plate 2 to ensure the top The sealing of the cover assembly is installed, and the insulating connection between the cover cap 1 and the explosion-proof valve plate 2 and the shell 5 is ensured. In this embodiment, by setting the explosion-proof valve plate 2 on the side of the cap 1 facing the winding core 6, that is, the explosion-proof valve plate 2 is located inside the battery, thereby preventing the explosion-proof valve plate 2 from being touched, squeezed and corroded by the outside world. effect to reduce the risk of explosion protection failure in the event of a short circuit. At the same time, because the explosion-proof valve plate 2 is connected to the circuit, when a short circuit occurs, the high temperature on the explosion-proof valve plate 2 will promote the fusing of the fracture, so that the inside and outside of the battery can be smoothly conducted to realize pressure relief. Therefore, the top cover assembly is beneficial to improve the explosion-proof reliability of the battery.

Optionally, as shown in FIG. 3 and FIG. 5 , the cap 1 includes an integrally formed terminal portion 11 and a sealing plate portion 12, 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 shell Body 5 is coaxial. The sealing part 12 is located at one end of the terminal part 11 close to the winding core 6, so that the end of the terminal part 11 facing away from the winding core 6 protrudes from the surface of the sealing part 12, so as to connect the terminal part 11 to external electrical equipment. Along the axial direction of the battery, the distance between the end surface of the terminal part facing away from the winding core 6 and the sealing part 12 is 1-4 mm, which can also be understood as the terminal part 11 protrudes from the surface of the sealing part 12 by 1-4 mm. The pressure relief groove 10 is disposed on a side of the terminal portion 11 facing the winding core 6 , and the pressure relief hole 13 is defined on the wall of the pressure relief groove 10 , and the pressure relief hole 13 communicates with the outside of the battery. There are a plurality of pressure relief holes 13 , and the plurality of pressure relief holes 13 are distributed at intervals along the circumferential direction of the pressure relief groove 10 . In this embodiment, the number of pressure relief holes 13 is 3-12. It can be understood that the size and number of the pressure relief holes 13 are related to the pressure relief efficiency. Therefore, in practical applications, the number and diameter of the pressure relief holes 13 can be adaptively selected according to the theoretical gas discharge rate.

Optionally, the groove wall of the pressure relief groove 10 is inclined toward the axis of the pressure relief groove 10 from one end near the notch to the end near the bottom of the groove. This structure makes the pressure relief groove 10 have a shape with a large opening and a small bottom. , so as to facilitate the integral molding process of the cap 1 . It can be understood that the extension direction of the groove wall of the pressure relief groove 10 forms an included angle with both the axial direction and the radial direction of the battery. The pressure relief hole 13 is defined on the wall of the pressure relief groove 10 , and the axial direction of the pressure relief hole 13 is perpendicular to the extending direction of the wall of the pressure relief groove 10 . This structure makes the axial direction of the pressure relief hole 13 form an included angle with both the axial and radial directions of the battery. During the explosion-proof pressure relief, the gas is sprayed out along the axis of the pressure relief hole 13, and the electrolyte inside the battery will be sprayed out together with the gas. By inclining the pressure relief hole 13 relative to the axial and radial directions of the battery, the jetted gas and electrolyte jet out obliquely upward of the battery, reducing the impact on adjacent batteries in the battery module.

Optionally, as shown in Fig. 3 and Fig. 7, the explosion-proof valve plate 2 includes an integrally formed valve plate bottom plate 21, a valve plate top plate 22 and a connecting plate 23, the valve plate bottom plate 21 is in the shape of a disc, and the valve plate top plate 22 is in the shape of a circle. Ring, the outer ring end of the valve plate top plate 22 is connected to the periphery of the valve plate bottom plate 21 through the connecting plate 23, so that the second installation groove 25 is formed between the valve plate bottom plate 21, the connecting plate 23 and the valve plate top plate 22 , the peripheral portion of the cap 1 is plugged into the second installation groove 25 . In this embodiment, the valve plate bottom plate 21 abuts against the side of the sealing portion 12 of the cap 1 facing the inside of the battery, the valve plate top plate 22 abuts against the side of the sealing portion 12 of the cap 1 facing the outside of the battery, and the sealing portion The peripheral portion of 12 is inserted into the second installation groove 25 to realize the installation and fixation of the two and ensure a reliable electrical connection between the two.

The valve bottom plate 21 of the explosion-proof valve plate 2 is located on the side of the cap 1 facing the inside of the battery, that is, the valve bottom plate 21 is used to block the pressure relief groove 10 . A notch 24 is provided on the valve base plate 21 , and the notch 24 is in a closed shape, such as a square, a rectangle, a circle, a triangle and a polygon. In this embodiment, the notch 24 is circular. When the air pressure inside the battery exceeds the set value, the gas inside the battery forms an impact on the valve bottom plate 21 and separates the valve bottom plate 21 inside the notch 24 from the valve bottom plate 21 outside the notch 24 . It can be understood that the closed-shaped notch 24 can divide the explosion-proof valve plate 2 into two parts, that is, the part inside the notch 24 and the part outside the notch 24 . The cross-sectional shape of the notch 24 includes but not limited to triangle, semicircle, trapezoid or rectangle. In this embodiment, the notch 24 is a semicircle. It can also be understood that the notch 24 is a gap opened on the explosion-proof valve plate 2, which reduces the strength of the explosion-proof valve plate 2 at the position of the gap. When the explosion-proof valve plate 2 is impacted by gas, the notch 24 located on the explosion-proof valve plate 2 is broken, so that the inside of the battery communicates with the outside through the pressure relief hole 13 . In this embodiment, since an electrical path is formed between the cap 1, the explosion-proof valve plate 2 and the confluence plate 3, when a short-circuit accident occurs, the temperature of the explosion-proof valve plate 2 rises sharply, and the position of the notch 24 is easily heated and fused. In order to ensure that the explosion-proof valve plate 2 can break smoothly when pressure relief is required to realize explosion-proof pressure relief.

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 ruptures the explosion-proof valve plate 2. After the rupture, the explosion-proof valve plate 2 falls off and moves into the pressure relief groove 10. Hole 13 drains.

Optionally, as shown in FIG. 3 and FIG. 6 , the manifold 3 includes a first connecting portion 31 , a second connecting portion 32 and a bent plate 33 , and the first connecting portion 31 and the second connecting portion 32 are respectively arranged at the bent At both ends of the plate 33 , the first connecting portion 31 is connected to the explosion-proof valve plate 2 , and the second connecting portion 32 is used to connect to the positive tab of the winding core 6 . Before the battery is assembled, the bent plate 33 is straight to facilitate processing and adapt to the assembly process; when the battery is assembled, the bent plate 33 is bent so that the bent plate 33 is bent into an "S" shape or a "U". shape, so that the first connecting portion 31 and the second connecting portion 32 can be distributed at intervals along the axial direction of the battery, so as to adapt to the spatial structure of the entire 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 bent repeatedly, and bent into an "S" shape, so that the first connecting part 31 and the second connecting part 32 are elastically connected by the bending plate 33, and the bending plate 33 bends Fold it into an "S" shape to make it elastic. The explosion-proof valve plate 2 located inside the notch 24 is recessed toward the inside of the battery, so that the first connection portion 31 of the manifold 3 is connected to the recessed area of the explosion-proof valve plate 2 for installation and connection. When explosion-proof pressure relief is required, the explosion-proof valve plate 2 inside the notch 24 breaks and falls off, and the detached explosion-proof valve plate 2 stretches the bending plate 33 and moves toward the inside of the pressure relief groove 10 . Therefore, the bending structure of the bending plate 33 can avoid hindering the falling off of the explosion-proof valve plate 2 .

Optionally, as shown in Fig. 3 and Fig. 4, the sealing ring 4 is in the form of a ring, and the space between the cap 1 and the housing 5 and between the explosion-proof valve plate 2 and the housing 5 are separated by the sealing ring 4 to avoid The battery is shorted. The side of the inner ring of the sealing ring 4 is recessed with a first installation groove, and the notch of the first installation groove faces the center of the sealing ring 4 . Both the peripheral portion of the cap 1 and the peripheral portion of the explosion-proof valve plate 2 are inserted into the first installation groove. The sealing ring 4 has good sealing and insulating 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 other embodiments, the valve plate top plate 22 and the connecting plate 23 in the explosion-proof valve plate 2 can also be eliminated, the sealing plate portion 12 of the cap 1 and the valve plate bottom plate 21 are stacked, and the peripheral parts of the two are directly inserted Set in the first installation groove.

The remarkable effect of this embodiment is: by setting the explosion-proof valve plate 2 on the side of the cap 1 facing the winding core 6, that is, the explosion-proof valve plate 2 is located inside the battery, thereby preventing the explosion-proof valve plate 2 from being touched and squeezed by the outside world. and corrosion to reduce the risk of explosion-proof failure in the event of a short circuit. At the same time, because the explosion-proof valve plate 2 is connected to the circuit, when a short circuit occurs, the high temperature on the explosion-proof valve plate 2 will promote the fusing of the fracture, so that the inside and outside of the battery can be smoothly conducted to realize pressure relief. Therefore, the top cover assembly is beneficial to improve the explosion-proof reliability of the battery.

The utility model also provides a battery, as shown in FIG. 1 and FIG. 2 , comprising a casing 5 , a winding core 6 and the above-mentioned top cover assembly. The casing 5 has a cylindrical structure, and the casing 5 has an accommodating cavity 51 with one end open. The winding core 6 is installed in the accommodating cavity 51 of the casing 5 and is filled with electrolyte. The top cover assembly is installed on the open end of the casing 5, and enables the top cover assembly to seal the opening of the casing 5, so that the inside of the entire battery forms a sealed state. The junction plate 3 in the top cover assembly is connected to the positive tab of the winding core 6, so that the top cover assembly forms the positive pole of the battery. The end of the winding core 6 away from the top cover assembly is provided with a collecting plate 8, the negative lug of the winding core 6 is welded on the collecting plate 8, and the collecting plate 8 is located at the end of the accommodating cavity away from the opening, the collecting plate 8 and the shell 5 The connection realizes that the winding core 6 is electrically connected with the casing 5 through the collector plate 8, so that the casing 5 forms the negative pole of the battery.

Optionally, as shown in FIG. 3 , FIG. 4 and FIG. 8 , the housing 5 includes a housing body and a first bent portion and a second bent portion 52 extending toward the center of the battery. The housing body, the first bent portion and the The second bending portion 52 is integrally formed. The first bent part is "U" shaped, the opening of the first bent part faces the outside of the battery, the second bent part 52 is spaced from the first bent part, and the second bent part 52 is located at the end of the shell body , A third installation groove 53 is formed between the first bent portion, the second bent portion 52 and the shell body, that is, the third installation groove 53 is located at the end of the shell 5 . The notch of the third installation groove 53 faces the center of the housing 5 , and the sealing ring 4 is inserted into the third installation groove 53 to realize the installation and fixation between the top cover assembly and the housing 5 . By providing a third mounting groove 53 on the housing 5, and inserting the peripheral portion of the cap 1, the peripheral portion of the explosion-proof valve plate 2 and the sealing ring 4 into the third mounting groove 53, the structure has good sealing performance, Avoid electrolyte leakage inside the battery. The end of the casing 5 facing away from the top cover assembly is a smooth plane structure, so as to be used for connecting with the cooling system.

The battery further includes an insulating pad 7 , one end of the insulating pad 7 is sandwiched between the casing 5 and the winding core 6 , and the other end of the insulating pad 7 is sandwiched between the casing 5 and the sealing ring 4 . The insulation pad 7 has good insulation performance, and the insulation pad 7 can be made of PP (polypropylene) material, which is used to prevent the winding core 6 and the bus plate 3 located in the casing 5 from contacting the casing 5 . Referring to FIG. 4, it can be seen that one end of the insulating pad 7 is sandwiched between the end of the winding core 6 close to the top cover assembly and the housing 5, and the other end extends toward the top cover assembly, and is sandwiched between the sealing ring 4 and the housing 5. between.

The battery has an overall length of 65-130mm and a diameter of 30-65mm.

In the battery in this embodiment, since the explosion-proof valve plate 2 is arranged inside the battery, the explosion-proof valve plate 2 is prevented from being affected by external touch, extrusion, corrosion, etc., so as to reduce the risk of explosion-proof failure when a short circuit occurs, and the explosion-proof leakage Pressure reliability is high. Owing to be provided with sealing ring 4 and insulating pad 7. The insulating pad 7 separates the conductive parts inside the battery from the casing 5 to avoid short circuit. The sealing ring 4 plays a role of sealing and insulating the top cover assembly. On the one hand, it separates the positively charged cap 1 and the explosion-proof valve plate 2 from the negatively charged shell 5; Sealing function to avoid battery leakage accidents.

The above content is only a preferred embodiment of the present utility model. For those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation and scope of application. The content of this specification should not be understood as Limitations on the Invention.

Claims (15)

1. A top cover assembly, which is used to be installed at one end of the battery housing, and a winding core is installed in the housing, characterized in that, the top cover assembly includes a cap, an explosion-proof valve plate and a confluence plate, and the cap faces One side of the winding core is concavely provided with a pressure relief groove in a direction away from the winding core, and a pressure relief hole communicating with the outside of the battery is opened on the pressure relief groove, and the explosion-proof valve cover is arranged on the On the pressure relief groove, the explosion-proof valve plate can selectively block the pressure relief groove, one end of the confluence plate is connected with the explosion-proof valve plate, and the other end is used for connecting with the winding core, so that The cap is electrically connected to the winding core through the explosion-proof valve plate and the confluence plate in turn. 2. The top cover assembly according to claim 1, characterized in that there are a plurality of pressure relief holes, and a plurality of pressure relief holes are arranged at intervals in the pressure relief groove along the circumferential direction of the pressure relief groove. on the wall of the tank. 3. The top cover assembly according to claim 1, characterized in that, the groove wall of the pressure relief groove is inclined toward the axial direction of the pressure relief groove from one end close to the notch to one end close to the bottom of the groove, so that The pressure relief hole is opened on the groove wall, and the axis direction of the pressure relief hole is perpendicular to the extending direction of the groove wall. 4. The top cover assembly according to claim 1, wherein the explosion-proof valve plate is provided with a closed notch, and when the air pressure inside the battery exceeds a set value, it is located inside the notch. The explosion-proof valve plate is separated from the explosion-proof valve plate located outside the score. 5. The top cover assembly according to claim 4, wherein the orthographic projection of the notch on the cap is located inside the pressure relief groove. 6 . The top cover assembly according to claim 4 , wherein the cross section of the notch is one of triangular, semicircular, trapezoidal or rectangular. 7. The top cover assembly according to claim 4, wherein the confluence plate comprises a bent plate and a first connecting portion and a second connecting portion respectively arranged at both ends of the bent plate, the first The connection part is connected to the explosion-proof valve plate located inside the notch, the second connection part is used to connect with the winding core, the bending plate can be repeatedly bent, and the first connection The part is elastically connected to the second connecting part through the bent plate. 8 . The top cover assembly according to claim 7 , wherein the first connecting portion and the second connecting portion are distributed at intervals along the axial direction of the winding core. 9. The top cover assembly according to claim 1, characterized in that, the top cover assembly further comprises an annular sealing ring, the inner ring side of the sealing ring is concavely provided with a first installation groove, the The notch of the first installation groove faces the center of the sealing ring, and the peripheral portion of the cap and the explosion-proof valve plate are both inserted into the first installation groove. 10. The top cover assembly according to claim 9, wherein the explosion-proof valve plate comprises an integrally formed valve plate bottom plate, a valve plate top plate and a connecting plate, the valve plate top plate is circular, and the valve plate The outer ring end of the top plate is connected to the periphery of the bottom plate of the valve plate through a connecting plate, so that a second installation groove is formed between the bottom plate of the valve plate, the connecting plate and the top plate of the valve plate, and the The peripheral portion of the cap is plugged into the second installation slot. 11. The top cover assembly according to any one of claims 1 to 10, wherein the cover cap includes a terminal portion and a sealing plate portion integrally formed, the pressure relief groove is provided on the terminal portion, the The sealing plate part is sleeved on the end of the terminal part close to the winding core, along the axis direction of the battery, the distance between the end surface of the terminal part (11) away from the winding core and the sealing plate part 1-4mm. 12. A battery, characterized in that it comprises the top cover assembly according to any one of claims 1 to 11, a casing and a winding core, the casing has an accommodating chamber with one end open, and the winding core is installed on In the accommodating cavity, the top cover assembly is arranged at the opening end of the housing, and enables the top cover assembly to block the opening, and the collector plate is connected to the lug of the winding core. 13 . The battery according to claim 12 , wherein a collecting plate is provided at one end of the receiving cavity away from the opening, and the winding core is electrically connected to the casing through the collecting plate. 14 . 14. The battery according to claim 12, wherein the top cover assembly further comprises a sealing ring, the sealing ring is provided with a first installation groove with a notch facing the center of the sealing ring, the cap and the sealing ring The periphery of the explosion-proof valve plate is inserted into the first installation groove, the housing is provided with a third installation groove, the notch of the third installation groove faces the center of the housing, and the sealing ring inserted into the third installation slot. 15. The battery according to claim 14, wherein the battery further comprises an insulating pad, one end of the insulating pad is interposed between the casing and the winding core, and the other end of the insulating pad is One end is sandwiched between the housing and the sealing ring.

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