CN219626762U - Top cap subassembly, electric core and electric core module - Google Patents

Abstract

The utility model relates to a top cover assembly, a battery cell and a battery cell module, wherein the top cover assembly comprises a top cover plate and an explosion-proof valve, the top cover plate comprises a plate body, the plate body is provided with a first side face facing a core bag and a second side face opposite to the first side face, a boss is convexly arranged on the first side face, an explosion-proof hole is formed in one side face of the boss facing the core bag and penetrates through the plate body, the explosion-proof valve cover is arranged in the explosion-proof hole, and the explosion-proof valve is flush with or protrudes out of one side face of the boss facing the core bag. When the battery cell is used in an inverted mode, electrolyte which is dripped onto the first side face can be prevented from flowing into the explosion-proof hole through the blocking effect of the boss. Meanwhile, the explosion-proof valve is flush with the boss or protrudes out of the boss, so that electrolyte falling onto the explosion-proof valve can flow downwards onto the first side face. The top cover component can prevent electrolyte from accumulating on the explosion-proof valve, and further avoid the electrolyte from corroding the explosion-proof valve, so that the reliability of the explosion-proof valve is ensured.

Description

Top cap subassembly, electric core and electric core module

Technical Field

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

Background

The battery cell module is widely applied to equipment such as new energy automobiles, electric bicycles, mobile base stations and the like as a power supply unit. The battery cell module comprises a plurality of single battery cells, and the plurality of single battery cells are connected together in series and parallel to form a power supply unit. In order to ensure the safe operation of the single battery cell, an explosion-proof valve is usually arranged on a top cover assembly of the single battery cell, and when the internal air pressure of the battery cell exceeds a set value, the explosion-proof valve can be opened to realize pressure relief protection. When the conventional battery cell module is in practical application, the top cover assembly of the single battery cell is arranged upwards, namely the explosion-proof valve is positioned at the top of the single battery cell. When the pressure relief protection is carried out, electrolyte in the single cell can be sprayed out along with gas, and the sprayed electrolyte can pollute and destroy other surrounding single cells, so that the normal operation of the whole cell module is affected.

In the related art, in order to prevent the upward blowout of electrolyte when the pressure release is protected, set up the top cap subassembly of monomer electric core downwards, the monomer electric core inverts and uses and to spray to the other monomer electric cores of annex in spite of can avoiding the pressure release to protect the time electrolyte, but the inside electrolyte of monomer electric core can the whereabouts to make the electrolyte deposit on the explosion-proof valve cause the corruption to the explosion-proof valve, and then reduce the explosion-proof reliability of explosion-proof valve.

Disclosure of Invention

An object of the present utility model is to provide a top cap assembly that can prevent electrolyte from corroding an explosion-proof valve when a battery cell is used upside down, and the reliability of the explosion-proof valve is high.

Another object of the present utility model is to provide a battery cell with high explosion-proof safety.

It is still another object of the present utility model to provide a cell module that can avoid contamination or damage to other cells in the vicinity during explosion venting.

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

the utility model provides a top cap subassembly, including lamina tecti and explosion-proof valve, lamina tecti includes the board body, the board body have towards the first side of core package and with the second side that first side is on the back of the body, the protrusion is provided with the boss on the first side, the boss orientation the explosion-proof hole has been seted up to one side of core package, just the explosion-proof hole runs through the board body, explosion-proof valve gap locates the explosion-proof hole, explosion-proof valve parallel and level or protrusion in boss orientation one side of core package.

As a preferable scheme of the top cover assembly, the explosion-proof hole comprises a first hole and a second hole which are coaxially arranged, the first hole is positioned on one side of the second hole facing the core bag, the diameter of the first hole is larger than that of the second hole, and the explosion-proof valve is arranged in the first hole.

As a preferable scheme of the top cover assembly, a groove is concavely formed in the second side face of the plate body, and the bottom of the groove is communicated with the explosion-proof hole.

As a preferable scheme of the top cover assembly, the anti-explosion device further comprises a first protection film, wherein the first protection film is arranged in the groove, and the first protection film is used for blocking the anti-explosion hole.

As a preferable scheme of the top cover assembly, the anti-explosion valve further comprises a second protective film, wherein the second protective film is covered on the end face of the anti-explosion valve, which faces the core bag.

As a preferable scheme of the top cover assembly, the side wall of the boss and the first side face are arranged at an obtuse angle.

As a preferred scheme of top cap subassembly, still include the insulation board, the insulation board set up in the lamina tecti orientation one side of core package, set up on the insulation board with explosion-proof hole intercommunication's through-hole.

As a preferable mode of the top cover assembly, a supporting member is arranged on one side face of the insulating plate, which faces the top cover plate, in a protruding mode, the supporting member is connected with the plate body, and the insulating plate is separated from the boss.

The utility model provides a battery cell, including foretell top cap subassembly, still include the core package, top cap subassembly still includes the utmost point post, the utmost point ear of core package with utmost point post electric connection.

The utility model provides a battery cell module, including foretell battery cell, still include the casing, the battery cell is a plurality of, a plurality of the battery cell stack in proper order in the casing, just the top cap subassembly orientation of battery cell the bottom of casing.

Compared with the prior art, the utility model has the beneficial effects that:

according to the top cover assembly, the battery cell and the battery cell module, the boss is arranged on one side, facing the core package, of the top cover plate, and the explosion-proof hole is formed in the boss. When the battery cell is used in an inverted mode, electrolyte which is dripped onto the first side face can be prevented from flowing into the explosion-proof hole through the blocking effect of the boss. Meanwhile, the explosion-proof valve is flush with the boss or protrudes out of the boss, so that electrolyte falling onto the explosion-proof valve can flow downwards onto the first side face. The top cover component can prevent electrolyte from accumulating on the explosion-proof valve, and further avoid the electrolyte from corroding the explosion-proof valve, so that the reliability of the explosion-proof valve is ensured.

Drawings

Fig. 1 is a schematic diagram of a battery cell module according to an embodiment of the utility model.

Fig. 2 is a cross-sectional view of a cap assembly according to an embodiment of the present utility model.

Fig. 3 is an enlarged view at a in fig. 2.

Fig. 4 is a schematic view of a top cover plate according to an embodiment of the utility model.

Fig. 5 is a partial cross-sectional view of a top deck of an embodiment of the present utility model.

Fig. 6 is a schematic view of an insulating plate according to an embodiment of the present utility model.

In the figure:

100. a battery cell;

1. a top cover assembly; 11. a top cover plate; 111. a plate body; 1111. a first side; 1112. a second side; 112. a boss; 113. explosion-proof holes; 114. a groove; 115. a mounting hole; 12. an insulating plate; 121. a support; 122. a through hole; 13. an explosion-proof valve; 14. a connecting sheet; 15. a pole; 16. a first protective film; 17. a effusion chamber; 18. a second protective film; 2. a housing.

Detailed Description

In order to make the technical problems solved, the technical scheme adopted and the technical effects achieved by the utility model more clear, the technical scheme of the utility model is further described below by a specific embodiment in combination with the attached drawings.

As shown in fig. 1, the top cover assembly 1 provided by the utility model is arranged at one end of the housing 2. The shell 2 is of a square cavity structure with one end open, the top cover assembly 1 is covered on the opening of the shell 2, and a closed accommodating cavity is formed between the top cover assembly 1 and the shell 2. The holding cavity is internally provided with a core pack for converting chemical energy into electric energy, and the holding cavity is filled with electrolyte which is used for infiltrating the core pack and participating in the electric energy conversion of the core pack. The cap assembly 1, the housing 2, the core pack and the electrolyte form the cell 100. The top cover assembly 1 is provided with two polar posts 15, the two polar posts 15 are respectively a positive polar post and a negative polar post, and the positive polar post and the negative polar post are respectively electrically connected with a positive polar lug and a negative polar lug on the core pack. The pole 15 is used for connection with an external power device to achieve input or output of electric power.

Referring to fig. 2 and 3, the cap assembly 1 includes a cap plate 11, an insulating plate 12, an explosion-proof valve 13, a connection piece 14, a post 15, and a first protection film 16. The insulating plate 12 is disposed on the side of the top cover plate 11 facing the core pack, and the insulating plate 12 plays a role of insulating and isolating the core pack. An explosion-proof valve 13 is provided at a middle position of the top cover plate 11. The explosion-proof valve 13 is used for protecting the pressure relief of the battery cell, and when the battery cell fails and the internal air pressure rises, the gas in the battery cell 100 is discharged to the outside of the battery cell 100 through the falling or rupture of the explosion-proof valve 13. The number of the connecting pieces 14 and the number of the poles 15 are two. The two poles 15 are spaced apart along the length of the top cover 11, and one end of each pole 15 extends to the outside of the battery cell 100. The two connecting pieces 14 are arranged in one-to-one correspondence with the two pole posts 15, one end of each connecting piece 14 is used for welding the pole lugs of the core pack, and the other end of each connecting piece 14 is connected with the corresponding pole post 15. A first protection film 16 is provided on the top cover plate 11 for providing waterproof and dustproof protection for the explosion-proof valve 13.

Specifically, referring to fig. 4, two mounting holes 15 for penetrating the pole 15 are provided on the top cover plate 11 at intervals along the length direction of the top cover plate 11. And the top cover plate 11 is further provided with an explosion-proof hole 113 for installing the explosion-proof valve 13, and the explosion-proof hole 113 is positioned between the two installing holes 15.

Specifically, referring to fig. 5, the top cover plate 11 includes an integrally formed plate body 111 and a boss 112. The plate body 111 has a flat plate structure, and the plate body 111 is plugged into the opening of the housing 2 and is welded to the housing 2. The plate body 111 has a first side 1111 facing the core pack and a second side 1112 opposite the first side 1111. I.e., the first side 1111 faces the interior of the cell and the second side 1112 faces the exterior of the cell. The boss 112 is disposed on the first side 1111 in a protruding manner, and the free end of the boss 112 extends toward the inside of the battery cell. Explosion-proof hole 113 is opened on boss 112, and explosion-proof hole 113 communicates with second side 1112 of plate body 111. It can be appreciated that the inside and the outside of the battery cell can be communicated through the explosion-proof hole 113, so that the gas inside the battery cell 100 can be discharged through the explosion-proof hole 113 when the pressure relief protection is realized.

The explosion proof hole 113 includes a first hole and a second hole coaxially disposed, the first hole being located at a side of the second hole toward the core pack, and a diameter of the first hole being larger than a diameter of the second hole. It is also understood that the explosion proof hole 113 is a counter bore, the large hole end of the explosion proof hole 113 is located at a side close to the core pack, and the small hole end of the explosion proof hole 113 is located at a side far away from the core pack. The explosion-proof valve 13 is disposed in a first hole of the explosion-proof hole 113. By arranging the explosion-proof hole 113 into a counter bore structure, the explosion-proof valve 13 is conveniently installed and fixed, namely, the explosion-proof hole 113 is installed on a step surface between the first hole and the second hole.

The depth of the first hole of the explosion proof hole is less than or equal to the thickness of the explosion proof valve 13. So that when the explosion-proof valve 13 is installed in the explosion-proof valve 13, the end face of the explosion-proof valve 13 facing the core pack can be flush with the side face of the boss 112 facing the core pack, or the end face of the explosion-proof valve 13 facing the core pack can protrude from the side face of the boss 112 facing the core pack. It will be appreciated that when the cell 100 is used upside down, i.e., the top cap assembly 1 of the cell is facing downward. The electrolyte on the core bag can drop downwards under the action of self gravity. The dropped electrolyte portion passes through the insulating plate 12 and falls on the top cover plate 11. By arranging the boss 112, and opening the explosion-proof hole 113 on the boss 112. The electrolyte on the first side 1111 can be prevented from flowing into the explosion-proof hole 113. Meanwhile, since the explosion-proof valve 13 is flush with the boss 112 or protrudes beyond the boss 112, the electrolyte falling onto the explosion-proof valve 13 also flows down onto the first side 1111. Therefore, under the blocking effect of the boss 112 on the electrolyte, the electrolyte can be prevented from accumulating on the explosion-proof valve 13, and further the electrolyte is prevented from corroding the explosion-proof valve 13, so that the reliability of the explosion-proof valve 13 is ensured.

The second side 1112 of the plate body 111 is concavely provided with a groove 114, and the bottom of the groove 114 is communicated with the explosion-proof hole 113. The first protection film 16 is disposed at the bottom of the groove 114, and enables the first protection film 16 to block the explosion-proof hole 113. By providing the groove 114, the first protection film 16 is located in the groove 114, so that the first protection film 16 is prevented from being damaged due to contact with other external devices.

Specifically, the top cover assembly 1 further includes a second protective film. The second protective film is identical to the first protective film 16 and is used to provide protection for the explosion proof valve 13. The second protective film is covered on the end face of the explosion-proof valve 13 facing the core bag. For easy installation, a second protective film is provided on a side of the boss 112 facing the core pack and covers the explosion-proof valve 13. It will be appreciated that during cell operation, when gas is generated within the cell 100, the gas pressure does not reach the set relief pressure. The explosion-proof valve 13 is deformed under the gas pressure, for example, the explosion-proof valve 13 is recessed into the explosion-proof hole 113. By providing a second protective film on a side of the boss 112 facing the core pack, the electrolyte is blocked by the second protective film, and the electrolyte is prevented from accumulating in the recess of the explosion-proof valve 113.

Specifically, the first protective film 16 and the second protective film are waterproof and breathable films.

Specifically, the sidewall of the boss 112 is disposed at an obtuse angle with the first side 1111 of the plate body 111. It will be appreciated that the angle α between the side wall of the boss 112 and the first side 1111 is an obtuse angle, such that the side wall of the boss 112 is inclined relative to the first side 1111, and the end of the boss 112 near the explosion proof hole 113 is inclined downward to the end near the first side 1111. This configuration facilitates drainage of electrolyte on boss 112 to facilitate electrolyte flow on boss 112 to first side 1111.

Specifically, referring to fig. 3 and 6, the insulating plate 12 is made of an insulating material, and the top cover plate 11 is made of an aluminum plate. The insulating plate 12 is disposed on a side of the top cover 11 facing the core pack, and the insulating plate 12 is used for insulating and isolating the core pack from the top cover 11. The insulating plate 12 is perforated with a plurality of through holes 122 through which the electrolyte and the gas flow. The through holes 122 are opposite to the explosion-proof holes 113, so that electrolyte and gas in the battery cell 100 can be discharged to the outside of the battery cell 100 through the through holes 122 and the explosion-proof holes 113 in sequence when the battery cell 100 is depressurized. The insulating plate 12 has a supporting member 121 protruding toward one side of the top cover 11, and the supporting member 121 abuts against the first side 1111 of the top cover 11. The height of the support 121 is greater than the height of the boss 112 such that the insulating plate 12 is spaced from the boss 112 by the support of the support 121. It will be appreciated that, under the action of the support 121, a liquid accumulation chamber 17 for containing the electrolyte can be formed between the insulating plate 12 and the first side 1111 of the top cover plate 11, and the dropped electrolyte can be collected in the liquid accumulation chamber 17.

In another embodiment, the explosion-proof hole 113 may be a through hole, and the explosion-proof valve 13 is welded and fixed at one end of the explosion-proof hole 113 facing the core pack.

The beneficial effects of this embodiment are: by providing the boss 112 on the side of the top cover plate 11 facing the core pack, the explosion-proof hole 113 is opened on the boss 112. When the battery cell 100 is used upside down, the electrolyte dropped onto the first side 1111 can be prevented from flowing into the explosion-proof hole 113 by the blocking action of the boss 112. Meanwhile, since the explosion-proof valve 13 is flush with the boss 112 or protrudes beyond the boss 112, the electrolyte falling onto the explosion-proof valve 13 also flows down onto the first side 1111. The top cover assembly 1 can prevent electrolyte from accumulating on the explosion-proof valve 13, and further prevent the electrolyte from corroding the explosion-proof valve 13, so that the reliability of the explosion-proof valve 13 is ensured.

As shown in fig. 1, a battery cell 100 is also provided. The cell 100 includes a cap assembly 1, a core pack, and a housing 2. The top cover assembly 1 is disposed at one end of the housing 2, and the top cover plate 11 of the top cover assembly 1 is welded to the housing 2. The core package is arranged in the shell 2, the top cover component 1 is provided with a positive pole and a negative pole, the positive pole is electrically connected with a positive pole lug on the core package, and the negative pole is electrically connected with a negative pole lug on the core package. When the battery cell is used in an inverted mode, the boss 112 is arranged on the top cover plate 11, so that electrolyte is blocked from being accumulated on the explosion-proof valve 13 by the boss 112, and the explosion-proof valve 13 is prevented from being corroded by the electrolyte. When the battery cell 100 needs to be decompressed due to an accident, the decompression protection can be smoothly performed through the explosion-proof valve 13, so that the battery cell 100 has higher safety in operation.

As shown in fig. 1, a battery cell module is also provided. The cell module includes a housing and a plurality of cells 100. The plurality of battery cells 100 are stacked in sequence in the housing, and the top cover assembly 1 of the battery cells 100 faces the bottom of the housing. A liquid cooling plate is also arranged in the shell and is positioned at one end of the battery cell 100, which is away from the top cover assembly 1. It will be appreciated that, during use of the battery cell module, the top cap assembly 1 of the battery cell 100 is disposed downward such that the explosion-proof valve 13 is positioned at the bottom end of the battery cell 100. When an accident occurs to one of the battery cells 100 in the battery cell module, the battery cell 100 is decompressed through the explosion-proof hole 113 at the bottom of the battery cell module. Compared with the prior art of pressure relief from the top of the battery cell 100, the battery cell module can avoid pollution and damage to other surrounding battery cells 100 caused by upward ejection of electrolyte during pressure relief.

The foregoing is merely exemplary of the present utility model, and those skilled in the art should not be considered as limiting the utility model, since modifications may be made in the specific embodiments and application scope of the utility model in light of the teachings of the present utility model.

Claims (10)

1. The utility model provides a top cap subassembly, its characterized in that, includes lamina tecti and explosion-proof valve, lamina tecti includes the plate body, the plate body have towards the first side of core package and with the second side that first side is on the back of the body, the protrusion is provided with the boss on the first side, the boss orientation the explosion-proof hole has been seted up to one side of core package, just the explosion-proof hole runs through the plate body, explosion-proof valve gap is located the explosion-proof hole, explosion-proof valve parallel and level or protrusion in boss orientation one side of core package.

2. The header assembly of claim 1, wherein the explosion proof aperture comprises a first aperture and a second aperture coaxially disposed, the first aperture being located on a side of the second aperture facing the core pack, and the first aperture having a diameter greater than a diameter of the second aperture, the explosion proof valve being disposed within the first aperture.

3. The header assembly of claim 1, wherein the second side of the plate body is concavely provided with a groove, and a bottom of the groove communicates with the explosion proof hole.

4. The header assembly of claim 3, further comprising a first protective film disposed within the recess and causing the first protective film to block the explosion vent.

5. The header assembly of claim 1, further comprising a second protective film covering an end face of the explosion proof valve facing the core pack.

6. The header assembly of claim 1, wherein the sidewall of the boss is disposed at an obtuse angle with respect to the first side.

7. The header assembly of any one of claims 1 to 6, further comprising an insulating plate disposed on a side of the header plate facing the core pack, the insulating plate being provided with a through hole communicating with the explosion-proof hole.

8. The header assembly of claim 7, wherein a side of the insulating plate facing the header plate is provided with a support protruding therefrom, the support being coupled to the plate body and spacing the insulating plate from the boss.

9. A battery cell, comprising the cap assembly of any one of claims 1 to 8, further comprising a core pack, the cap assembly further comprising a pole, the tab of the core pack being electrically connected to the pole.

10. The battery cell module is characterized by comprising the battery cells of claim 9, and further comprising a plurality of shell bodies, wherein the battery cells are sequentially stacked in the shell bodies, and a top cover assembly of each battery cell faces to the bottom of the shell body.