Explosion-proof valve film, battery cell and battery cell module

Abstract

The utility model relates to the technical field of batteries, and discloses an anti-explosion valve film, a battery cell and a battery cell module, and the anti-explosion valve film comprises a film body which is arranged above an open slot, suitable for mounting an anti-explosion valve plate, on a substrate of a battery; the buckling part is connected to the periphery of the pasting film body, extends towards the direction of the base plate, and is buckled on a boss which is arranged on the base plate and surrounds the opening groove in a surrounding manner; the inner side of the buckling part is hermetically connected with the outer side of the boss; and the bottom surface of the buckling part is hermetically connected with the top surface of the substrate. According to the technical scheme, the boss is combined with the buckling part connected to the boss in the sealed mode, so that the anti-explosion valve plate is protected, and overflowing electrolyte is prevented from entering the anti-explosion valve plate and corroding the anti-explosion valve plate; the blasting performance and the welding strength of the anti-explosion valve plate are ensured; the anti-explosion valve plate is prevented from falling off, the risk that the electrolyte leaks from the open slot is reduced, and the safety performance of the lithium battery is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to a kind of explosion-proof valve film, battery cell and battery cell module. BACKGROUND

[0002] As shown in Figures 1 to 3 For the existing lithium battery, in the process of injecting electrolyte 2 into the inside of lithium battery through its liquid injection port 1, when the injection speed of electrolyte 2 is too fast, or the tool for injecting electrolyte 2 does not completely press the liquid injection port 1, the electrolyte 2 is easy to overflow, and spread on the cover plate 3 of the lithium battery. There is usually an explosion-proof valve piece 4 on the cover plate 3, which is usually welded and installed on the cover plate 3 by an open slot 5, and protected by a plastic film 6. The overflowed electrolyte 2 is easy to enter the explosion-proof valve piece 4 from the open slot 5 of the cover plate 3, thereby corroding the explosion-proof valve piece 4; after the air 7 enters the explosion-proof valve piece 4, the electrolyte 2 and the air 7 mix, further corroding the surface of the explosion-proof valve piece 4, seriously reducing the bursting performance of the explosion-proof valve piece 4, and even reducing the welding strength of the explosion-proof valve piece 4 to cause the explosion-proof valve piece 4 to fall off, resulting in the risk of electrolyte 2 leakage, and seriously reducing the safety performance of the lithium battery. Among them, Figure 2 The arrow in Figure 3 The arrow in CONTENT OF THE UTILITY MODEL

[0003] Therefore, the utility model provides an explosion-proof valve film to solve the problem that, for the existing lithium battery, in the process of injecting electrolyte into the inside of lithium battery through its liquid injection port, when the injection speed of electrolyte is too fast, or the tool for injecting electrolyte does not completely press the liquid injection port, the electrolyte is easy to overflow, and spread on the cover plate of the lithium battery; the overflowed electrolyte is easy to enter the explosion-proof valve piece from the open slot of the cover plate, thereby corroding the explosion-proof valve piece; after the air enters the explosion-proof valve piece, the electrolyte and the air mix, further corroding the surface of the explosion-proof valve piece, seriously reducing the bursting performance of the explosion-proof valve piece, and even reducing the welding strength of the explosion-proof valve piece to cause the explosion-proof valve piece to fall off, resulting in the risk of electrolyte leakage, and seriously reducing the safety performance of the lithium battery.

[0004] In the first aspect, the utility model provides an explosion-proof valve film, comprising:

[0005] The film body is arranged above the open slot of the explosion-proof valve piece on the substrate of the battery.

[0006] The buckle part is connected to the periphery of the film body, extends to the substrate, and is buckled around the boss arranged around the opening slot on the substrate; the inner side of the buckle part is sealingly connected to the outer side of the boss; and the bottom surface of the buckle part is sealingly connected to the top surface of the substrate. The application has the beneficial effects that the buckle part is sealingly connected to the boss through the boss, the protection of the explosion-proof valve piece is realized, the overflowed electrolyte is prevented from entering the explosion-proof valve piece to corrode the explosion-proof valve piece, the explosion performance and welding strength of the explosion-proof valve piece are ensured, the explosion-proof valve piece is prevented from falling off, the risk of electrolyte leakage from the opening slot is reduced, and the safety performance of the lithium battery is ensured.

[0007] Optionally, the inner side of the buckle part is sealingly connected to the outer side of the boss through sealing glue; and the bottom surface of the buckle part is sealingly connected to the top surface of the substrate through sealing glue. The application has the beneficial effects that the sealing glue is adhered to the substrate, and the electrolyte cannot directly fall into the opening slot where the explosion-proof valve piece is located during the injection of the electrolyte.

[0008] Optionally, a gap is arranged between the film body and the top surface of the boss; and an exhaust port is arranged on the buckle part and communicates with the gap. The application has the beneficial effects that the exhaust port is arranged to prevent the air in the explosion-proof valve film from being stressed due to the breathing of the explosion-proof valve piece, and the protection performance of the explosion-proof valve film is affected.

[0009] Optionally, the exhaust port is arranged away from the liquid injection port arranged on the substrate. The application has the beneficial effects that the electrolyte is less likely to enter the explosion-proof valve piece, the electrolyte is prevented from polluting the explosion-proof valve piece, and the safety of long-term use of the explosion-proof valve piece is significantly improved.

[0010] Optionally, the position of the exhaust port is higher than the top surface of the substrate. The application has the beneficial effects that the electrolyte is less likely to enter the explosion-proof valve piece, the electrolyte is prevented from polluting the explosion-proof valve piece, and the safety of long-term use of the explosion-proof valve piece is significantly improved.

[0011] Optionally, a first channel suitable for storing electrolyte is arranged around the outside of the boss on the substrate. The application has the beneficial effects that the first channel further accommodates the overflowed electrolyte, and the electrolyte is prevented from corroding the explosion-proof valve piece.

[0012] Optionally, a second groove is arranged on the substrate around the boss and away from the liquid injection port side provided on the substrate, the second groove is arranged in communication with the first groove, and the depth of the second groove is greater than the depth of the first groove. Beneficial effects: the application adopts the above technical scheme, further accommodates more overflow electrolyte through the second groove, and makes the overflow electrolyte away from the explosion-proof valve piece, thereby further reducing the risk of corrosion of the explosion-proof valve piece.

[0013] In a second aspect, the utility model also provides a battery cell, which comprises the explosion-proof valve film.

[0014] Optionally, the battery cell further comprises:

[0015] The substrate is provided with a liquid injection port, the liquid injection port is suitable for injecting electrolyte into the battery cell, an open groove is arranged on the substrate, an explosion-proof valve piece is arranged in the open groove, a boss is arranged on the substrate around the open groove, and the explosion-proof valve film is buckled on the boss.

[0016] In a third aspect, the utility model also provides a battery cell module, which comprises a plurality of battery cells. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0018] Figure 1 It is a partial top view structural schematic diagram of the lithium battery in the prior art;

[0019] Figure 2 It is a schematic diagram of the electrolyte flowing to the position of the explosion-proof valve piece in the prior art;

[0020] Figure 3 It is a schematic diagram of the air flowing to the position of the explosion-proof valve piece immersed in the electrolyte in the prior art;

[0021] Figure 4 It is a partial top view structural schematic diagram of the battery provided in the first embodiment of the utility model;

[0022] Figure 5 It is a three-dimensional structural schematic diagram of the explosion-proof valve film provided in the first embodiment of the utility model;

[0023] Figure 6 It is a three-dimensional structural schematic diagram of the boss provided in the first embodiment of the utility model;

[0024] Figure 7 The sectional structure schematic diagram of the explosion-proof valve film provided in the first embodiment of the utility model after installation is shown in the figure;

[0025] Figure 8 The partial sectional structure schematic diagram of the battery provided in the first embodiment of the utility model is shown in the figure;

[0026] Figure 9 The partial sectional structure schematic diagram of the explosion-proof valve film provided in the first embodiment of the utility model after installation is shown in the figure; Figure 1 ;

[0027] Figure 10 The position schematic diagram of the exhaust port provided in the first embodiment of the utility model is shown in the figure;

[0028] Figure 11 The partial sectional structure schematic diagram of the explosion-proof valve film provided in the first embodiment of the utility model after installation is shown in the figure; Figure 2 ;

[0029] Figure 12 The partial top view structure schematic diagram of the battery provided in the second embodiment of the utility model is shown in the figure;

[0030] Figure 13 The partial sectional structure schematic diagram of the battery provided in the second embodiment of the utility model is shown in the figure;

[0031] Figure 14 The partial three-dimensional structure schematic diagram of the battery provided in the second embodiment of the utility model is shown in the figure; Figure 1 ;

[0032] Figure 15 The partial three-dimensional structure schematic diagram of the battery provided in the second embodiment of the utility model is shown in the figure; Figure 2 .

[0033] Mark explanation:

[0034] 1, liquid injection port; 2, electrolyte; 3, cover plate; 4, explosion-proof valve piece; 5, opening groove; 6, plastic film; 7, air; 8, film body; 9, base plate; 10, buckling part; 11, boss; 12, gap; 13, exhaust port; 14, first groove; 15, second groove. Specific implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0036] Implementation Method 1

[0037] like Figures 4 to 11 One specific embodiment of the explosion-proof valve film shown includes: a film body 8 and a fastening part 10. The explosion-proof valve film described in this application has a cap-type structure.

[0038] like Figures 4 to 7 As shown, the film body 8 is disposed on the battery substrate 9 above the opening slot 5 suitable for mounting the explosion-proof valve plate 4; specifically, the substrate 9 is also called a cover plate, which can be an aluminum plate; the battery is a lithium battery. The fastening part 10 is connected and disposed around the periphery of the film body 8, the fastening part 10 extends towards the substrate 9, and the fastening part 10 surrounds and fastens to the boss 11 disposed around the opening slot 5 on the substrate 9; the inner side of the fastening part 10 is sealed to the outer side of the boss 11; the bottom surface of the fastening part 10 is sealed to the top surface of the substrate 9.

[0039] Specifically, the inner side of the fastening part 10 is bonded to the outer side of the boss 11 with sealant; the bottom surface of the fastening part 10 is bonded to the top surface of the substrate 9 with sealant. An L-shaped adhesive backing is formed at the fastening part 10, surrounding the boss 11. The L-shaped adhesive backing adheres tightly to the smooth aluminum plate and the side of the boss 11, reducing the possibility of electrolyte 2 entering the explosion-proof valve plate 4, and making the explosion-proof valve film more stable, significantly improving the safety of the explosion-proof valve plate 4.

[0040] Furthermore, the film body 8 and the fastening part 10 can be integrally formed.

[0041] Furthermore, such as Figure 8 , Figure 9 and Figure 11 As shown, a gap 12 is provided between the top surface of the film body 8 and the protrusion 11; an exhaust port 13 communicating with the gap 12 is provided on the fastening part 10; the specific shape of the exhaust port 13 is not limited, and it can be a small hole, an elongated hole, or a short strip hole. The position of the exhaust port 13 is higher than the top surface of the substrate 9. Furthermore, as... Figure 10As shown, the vent 13 is located on the side away from the liquid injection port 1 on the substrate 9. This application leaves a gap 12 between the film body 8 and the boss 11; and on the side opposite to the liquid injection port 1, a vent 13 is provided. During the battery's breathing process, the explosion-proof valve film will not be stretched open due to the compression of air above the explosion-proof valve plate 4, thus affecting the protective performance of the explosion-proof valve film and effectively ensuring the breathing performance of the explosion-proof valve plate 4.

[0042] This application also provides a battery cell, including: the aforementioned explosion-proof valve film.

[0043] Furthermore, the battery cell also includes: a substrate 9, the substrate 9 having an injection port 1, the injection port 1 being adapted to inject electrolyte into the battery cell; an opening groove 5 being provided on the substrate 9, an explosion-proof valve plate 4 being installed in the opening groove 5; a boss 11 being provided on the substrate 9 surrounding the opening groove 5; and the explosion-proof valve film being fastened to the boss 11.

[0044] This application also provides a battery cell module, comprising: a plurality of the aforementioned battery cells.

[0045] Implementation Method 2

[0046] Furthermore, such as Figures 12 to 15 As shown, a first channel 14 suitable for storing electrolyte 2 is provided on the substrate 9 surrounding the protrusion 11. Furthermore, a second channel 15 is provided on the substrate 9 surrounding the protrusion 11 and away from the liquid injection port 1 on the substrate 9. The second channel 15 communicates with the first channel 14, and the depth of the second channel 15 is greater than the depth of the first channel 14. Other aspects are the same as in Embodiment 1.

[0047] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An explosion-proof valve sticker film, characterized by, The application comprises: a film body (8) arranged above an opening groove (5) of a battery substrate (9) suitable for mounting an explosion-proof valve piece (4); a clamping part (10) connected to the periphery of the film body (8), which extends towards the substrate (9) and is clamped around the boss (11) arranged around the opening groove (5) on the substrate (9); the inner side of the clamping part (10) is sealingly connected to the outer side of the boss (11); the bottom surface of the clamping part (10) is sealingly connected to the top surface of the substrate (9).

2. The explosion valve patch of claim 1, wherein, The inner side of the clamping part (10) is sealingly connected to the outer side of the boss (11); the bottom surface of the clamping part (10) is sealingly connected to the top surface of the substrate (9).

3. The explosion valve sticker according to claim 1 or 2, characterized in that, A gap (12) is arranged between the film body (8) and the top surface of the boss (11); an exhaust port (13) is arranged on the clamping part (10) and communicates with the gap (12).

4. The explosion valve patch of claim 3, wherein, The exhaust port (13) is arranged away from the liquid injection port (1) side of the substrate (9).

5. The explosion valve patch of claim 3, wherein, The position of the exhaust port (13) is higher than the top surface of the substrate (9).

6. The explosion valve sticker of claim 1 or 2, wherein, A first groove (14) suitable for storing electrolyte (2) is arranged around the outside of the boss (11) on the substrate (9).

7. The explosion valve patch of claim 6, wherein, A second groove (15) is arranged around the boss (11) on the substrate (9) and away from the liquid injection port (1) side of the substrate (9); the second groove (15) is arranged in communication with the first groove (14), and the depth of the second groove (15) is greater than the depth of the first groove (14).

8. An electric cell characterized by The application comprises: The explosion-proof valve film of any one of claims 1-7.

9. The electric cell of claim 8, wherein, The application further comprises: a substrate (9) provided with a liquid injection port (1) suitable for injecting electrolyte into the battery cell; an opening groove (5) is arranged on the substrate (9), and an explosion-proof valve piece (4) is mounted in the opening groove (5); a boss (11) is arranged around the opening groove (5) on the substrate (9); the explosion-proof valve film is clamped on the boss (11).

10. An electrochemical cell module, characterized by, The application comprises: A plurality of battery cells of claim 8 or 9.

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