CN217281113U

CN217281113U - Power battery explosion-proof valve device and power battery

Info

Publication number: CN217281113U
Application number: CN202221025175.4U
Authority: CN
Inventors: 杨文�; 牟丽莎; 李宗华; 李翠霞; 欧梅
Original assignee: Chongqing Changan New Energy Automobile Technology Co Ltd
Current assignee: Deep Blue Automotive Technology Co ltd
Priority date: 2022-04-29
Filing date: 2022-04-29
Publication date: 2022-08-23
Anticipated expiration: 2032-04-29

Abstract

The utility model provides a power battery explosion-proof equipment, include: the battery comprises a top cover plate, a battery cover plate and a battery cover plate, wherein one side end face of the top cover plate facing the internal space of the battery is outwards punched and formed with a groove and an outwards convex boss, and the bottom of the groove is provided with a through hole communicated with one side end face of the boss, which is far away from the groove; and the explosion-proof valve is assembled in the groove.

Description

Power battery explosion-proof valve device and power battery

Technical Field

The utility model relates to a battery technology field especially relates to a power battery explosion-proof valve device and power battery.

Background

Referring to fig. 1, the prior art provides an explosion-proof valve device, in which a groove 102 is formed on a top cover plate 101, and the groove 102 is used for installing an explosion-proof valve. Due to the opening of the existing groove 102, the entire thickness of the portion of the top cover plate 101 including the groove 102 becomes thin, resulting in insufficient strength of the top cover plate 102 at this portion. For this purpose, the prior art adds a reinforcement ring 103 to the other end face of the top cover plate 101 facing away from the groove 102. It has been verified that the strength of the improved roof deck 101 is still problematic because: the dimension of the groove 102 in the length direction of the top cover plate 101 is larger than that of the reinforcement ring 103, so that the problem of material thickness reduction still exists in the region a in the drawing (specifically, the region between the bottom surface of the groove 102 and the other end surface of the top cover plate 101 facing away from the groove 102), and the structural strength of the region a is still weak.

SUMMERY OF THE UTILITY MODEL

The utility model provides a power battery explosion-proof equipment and power battery for solve because of recess and boss differ at the length direction's of lamina tecti overall dimension and cause the lamina tecti to have the not enough problem of lamina tecti intensity that the thick attenuation region of material leads to.

The technical scheme of the utility model is that:

the utility model provides a power battery explosion-proof equipment, include:

the battery comprises a top cover plate, a battery cover plate and a battery cover plate, wherein one side end face of the top cover plate facing the internal space of the battery is outwards punched and formed with a groove and an outwards convex boss, and the bottom of the groove is provided with a through hole communicated with one side end face of the boss, which is far away from the groove;

and the explosion-proof valve is assembled in the groove.

Preferably, a preset gap is formed between the explosion-proof valve and the R-shaped corner trimming line of the groove.

Preferably, the explosion-proof valve and the boss are subjected to plane penetration welding.

Preferably, the power battery explosion-proof device further comprises:

the protective film, the protective film is in the boss deviates from it is fixed and will on the terminal surface of a side of recess the through-hole seals, the protective film with form the enclosure between the explosion-proof valve, just form the intercommunication on the protective film the bleeder vent of enclosure.

Preferably, the second end face of the boss is provided with a counter bore, and the protective film is assembled in the counter bore.

Preferably, a positioning block protrudes from the hole wall of the counter bore, a positioning hole matched with the positioning block is formed in the protective film, and an air hole for air circulation is formed between the positioning block and the positioning hole.

Preferably, the depth of the groove is greater than the maximum thickness of the explosion-proof valve, and the depth of the counter bore is greater than the thickness of the protective film.

Preferably, the explosion-proof valve is provided with a main nick and an auxiliary nick which are connected, and the bearable limit pressure of the main nick is smaller than the bearable limit of the auxiliary nick.

Preferably, the main score comprises: a first main nick, a second main nick, a third main nick, a fourth main nick and a fifth main nick which are connected to form an I shape; the second main nick and the third main nick are connected with the endpoint of one end of the first main nick, and the fourth main nick and the fifth main nick are connected with the endpoint of the other end of the first main nick;

the secondary score includes: a first sub-score connected to one end point of the first main score and a seventh sub-score connected to the other end point of the first main score.

The utility model also provides a power battery, include: the battery shell and the power battery explosion-proof device are characterized in that the top cover plate is assembled on the battery shell, and the explosion-proof valve is arranged on one side facing to the inner space of the battery shell.

The utility model has the advantages that:

the grooves and the bosses are formed in a stamping forming mode, the overall thickness of the formed bosses is consistent with that of other positions, which are not stamped, on the top cover plate, an area A in the background is not formed any more, the overall strength of the top cover plate can be guaranteed, and the problem that the material thickness of part of the top cover plate is thinner in the background technology is solved; because a preset gap is arranged between the explosion-proof valve and the R-angle trimming line of the groove, after the explosion-proof valve is placed in the groove, the explosion-proof valve and the bottom plane of the groove have a good surface fitting state, and then the explosion-proof valve and the boss are welded in a plane penetration welding mode. Compared with the existing welding mode of the anti-explosion valve and the groove in the R-angle joint mode, the welding position is adjusted to the position of the anti-explosion valve and the groove in the plane joint mode to carry out plane penetration welding, the welding difficulty is effectively reduced, and the welding reject ratio is reduced.

Drawings

FIG. 1 is a schematic diagram of a prior art explosion vent;

fig. 2 is an exploded schematic view of the explosion-proof device for power battery in the embodiment;

FIG. 3 is a sectional view of the explosion-proof device of the power battery in the embodiment without an explosion-proof valve and a protective membrane;

FIG. 4 is a sectional view of the power battery explosion-proof device in the embodiment when the explosion-proof valve and the protective film are installed;

FIG. 5 is a schematic view of the boss and the pellicle in this embodiment after assembly;

FIG. 6 is a schematic view of a protective film in the present embodiment;

FIG. 7 is a schematic view of the explosion-proof valve in the present embodiment;

a description of the reference numerals; 1-a top cover plate; 2-a groove; a 21-R angle trimming line; 3-counter bore; 31-a positioning block; 4-a closed space; 5-boss; 6-protective film; 7-air holes; 8-an explosion-proof valve; 61-positioning holes; 81-a first main score; 82-a second main score; 83-third main score; 84-a fourth main score; 85-fifth main score; 86-a first secondary score; 87-a second secondary score.

Detailed Description

The present invention will now be described in detail with reference to the accompanying drawings. The figures are simplified schematic diagrams illustrating the basic structure of the invention only in a schematic way, thus showing only the structure relevant to the invention.

Referring to fig. 2 to 6, the embodiment of the utility model provides a power battery explosion-proof valve 8 device, include: the battery comprises a top cover plate 1, wherein a groove 2 and an outward convex boss 5 are formed on the end surface of one side of the top cover plate 1 facing the internal space of the battery in an outward stamping mode; the bottom of the groove 2 is provided with a through hole communicated to the end surface of one side of the boss 5, which is far away from the groove; explosion-proof valve 8, explosion-proof valve 8 assembles in recess 2.

In the embodiment, the groove 2 and the boss 5 are formed in a punch forming mode, the thickness of the formed boss 5 is consistent with that of other non-punched positions on the top cover plate 1, the area A in the background is not formed any more, and the integral strength of the top cover plate 1 can be guaranteed; when the explosion-proof valve 8 is assembled on the boss 5, the top cover plate 1 is not easy to deform, and the assembling and processing requirements can be reduced.

Referring to fig. 4, a predetermined gap is provided between the explosion-proof valve 8 and the R-corner trim line 21 of the groove 2.

The value of the predetermined gap is not limited as long as the top surface of the explosion-proof valve 8 and the bottom surface of the groove 2 are in a surface-fitting state after the explosion-proof valve 8 is placed in the groove 2.

In addition, in the embodiment, the explosion-proof valve 8 and the boss 5 are connected by adopting plane penetration welding.

In this embodiment, since the predetermined gap is provided between the anti-explosion valve 8 and the R-corner trimming line 21 of the groove 2, after the anti-explosion valve 8 is placed in the groove 2, the anti-explosion valve 8 and the bottom plane of the groove 2 have a good surface-fitting state, and then the anti-explosion valve 8 and the boss 5 are welded by adopting a plane penetration welding method. Compare in current explosion-proof valve 8 and recess 2R angle laminating welding mode, with the welding position adjustment for explosion-proof valve 8 and recess 2's plane laminating department carry out the plane and pierce through the welding, effectively reduced the welding degree of difficulty to welding defective rate has been reduced.

In addition, the protective film 6 is provided with a back adhesive, so that the protective film can be directly adhered to the end surface of the boss 5 deviating from the groove 2.

Referring to fig. 3 and 4, in this embodiment, a counter bore 3 is formed in an end surface of the boss 5 facing away from the groove 2, the protective film 6 is assembled in the counter bore 3, the counter bore 3 and the through hole are arranged coaxially, and an edge of the counter bore 3 can be used for adhering a guide edge into which the protective film 6 is placed. The depth of the counter bore 3 is set to be slightly larger than (within 0.1 mm) the thickness of the protective film 6, and the sizes of the counter bore 3 in the X, Y direction are slightly larger than (within 0.3 mm) the size of the protective film 6, so that the convenience of the film sticking operation of the protective film 6 is ensured. Referring to fig. 4 and 5, a protruding positioning block 31 is arranged on the side wall of the counter bore 3, and the positioning block 31 is matched with a positioning hole 61 on the protection film 6 of the explosion-proof valve 8. The size of the positioning hole 61 of the protective film 6 is slightly larger than that of the positioning block 31, so that a gap is formed between the positioning hole 61 and the positioning hole 61, the gap can be used as a vent hole 7, and the vent hole 7 conducts the closed space 4 formed between the protective film 6 and the explosion-proof valve 8 and the outside air, so that the welding sealing condition between the explosion-proof valve 8 and the top cover plate 1 can be detected through the vent hole 7 after the power battery is pasted on the protective film 6. It is specifically noted here that the counter bore 3 and the positioning block 31 can be eliminated, and the vent hole 7 is directly formed in the protective film 6, so that the protective film 6 is directly adhered to the end surface of the boss 5 away from the groove 2.

Referring to fig. 3 and 4, in the present embodiment, the explosion-proof valve 8 is accommodated in the groove 2 of the boss 5, and the thickness of the groove 2 is slightly higher (within 0.1 mm) than the maximum wall thickness of the explosion-proof valve 8. The overall dimension of the explosion-proof valve 8 is slightly smaller than the edge cutting line at the R corner of the groove 2, so that the explosion-proof valve 8 is completely placed in the groove 2, the surface is well attached, and the welding is carried out at the plane attachment part of the explosion-proof valve 8 and the boss 5, and the ultrasonic welding or the laser welding can be adopted. In the embodiment, the welding track of the plane penetration welding is positioned on the central connecting line of the superposed part of the bottom surface of the groove 2 and the top plane of the explosion-proof valve 8.

Referring to fig. 7, in this embodiment, a main notch and an auxiliary notch connected to the main notch are provided in the explosion-proof valve 88, so that when thermal runaway occurs in the battery, the internal pressure of the battery can be quickly released, and explosion can be avoided, and the depths of the main notch and the auxiliary notch are in the range of 0.03-0.3 mm. The main scores include a first main score 81, a second main score 82, a third main score 83, a fourth main score 84 and a fifth main score 85 which form an "i" shape, the second main score 82 and the third main score 83 are connected with one end point of the first main score 81, the fourth main score 84 and the fifth main score 85 are connected with the other end point of the first main score 81, and the sub-scores include a first sub-score 86 connected with one end point of the first main score 81 and a second sub-score 87 connected with the other end point of the first main score 81. The depths of first and

second sub scores

86 and 87 are selected to be smaller than the depths of first, second, third, fourth and fifth

main scores

81, 82, 83, 84 and 85, and the ultimate pressures that can be borne at first, second, third, fourth and fifth

main scores

81, 82, 83, 84 and 85 are smaller than those of first and

second sub scores

86 and 87. At least one sub score is equally divided into two semicircular regions in addition to the first main score 81, the second main score 82, the third main score 83, the fourth main score 84, and the fifth main score 85. In the embodiment, the design pressure-bearing range of the explosion-proof valve 8 is 0.6-1.2MPa, when the internal pressure of the battery exceeds the designed main score and can bear the maximum pressure, the first main score 81, the second main score 82, the third main score 83, the fourth main score 84 and the fifth main score 85 are torn preferentially and extend to the first auxiliary score 86 and the second auxiliary score 87; that is, in the extreme case of the power battery, the first main score 81, the second main score 82, the third main score 83, the fourth main score 84 and the fifth main score 85 tear and drive the first auxiliary score 86 and the second auxiliary score 87 to tear, so as to actively release the internal pressure of the battery and avoid explosion.

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. An explosion-proof device for a power battery is characterized by comprising:

the battery cover plate comprises a top cover plate (1), wherein a groove (2) and an outward convex boss (5) are punched and formed in the outer side of the end face, facing the inner space of the battery, of the top cover plate (1), and a through hole communicated with the end face, facing away from the groove (2), of one side of the boss (5) is formed in the bottom of the groove (2);

the explosion-proof valve (8), explosion-proof valve (8) is assembled in recess (2).

2. The power battery explosion protection device of claim 1,

and a preset gap is formed between the explosion-proof valve (8) and the R-angle tangent line (21) of the groove (2).

3. The power battery explosion protection device according to claim 2, wherein the explosion protection valve (8) and the boss (5) are subjected to plane penetration welding.

4. The power battery explosion protection apparatus according to claim 1, further comprising:

protective film (6), protective film (6) are in boss (5) deviate from fixed and will on the side end face of recess (2) the through-hole seals, protective film (6) with form enclosure space (4) between explosion-proof valve (8), just form the intercommunication on protective film (6) bleeder vent (7) of enclosure space (4).

5. The power battery explosion-proof device according to claim 4, wherein the second end face of the boss (5) is provided with a counter bore (3), and the protective film (6) is assembled in the counter bore (3).

6. The explosion-proof device for the power battery according to claim 5, wherein a positioning block (31) protrudes from the hole wall of the counter bore (3), a positioning hole (61) matched with the positioning block (31) is formed in the protective film (6), and a vent hole (7) for gas to flow is formed between the positioning block (31) and the positioning hole (61).

7. Power cell explosion protection device according to claim 5, wherein the depth of the groove (2) is greater than the maximum thickness of the explosion-proof valve (8), and the depth of the counter bore (3) is greater than the thickness of the protective membrane (6).

8. The power battery explosion-proof device according to claim 1, wherein the explosion-proof valve (8) is provided with a main nick and an auxiliary nick which are connected, and the bearable limit pressure of the main nick is smaller than the bearable limit of the auxiliary nick.

9. The power battery explosion protection device of claim 8, wherein the main score comprises: a first main score (81), a second main score (82), a third main score (83), a fourth main score (84) and a fifth main score (85) which are connected to form an I-shaped shape; the second main score (82) and the third main score (83) are connected with the endpoint of one end of the first main score (81), and the fourth main score (84) and the fifth main score (85) are connected with the endpoint of the other end of the first main score (81);

the secondary score includes: a first sub score (86) connected to one end point of the first main score (81), and a seventh sub score (87) connected to the other end point of the first main score (81).

10. A power cell, comprising: the battery shell and the explosion-proof device of the power battery of any one of claims 1 to 9, wherein the top cover plate (1) is assembled on the battery shell, and the explosion-proof valve (8) is arranged on one side facing to the inner space of the battery shell.