Battery cover plate and battery

Abstract

The present application relates to a kind of battery cover plate and battery, the battery cover plate includes light aluminum plate, the light aluminum plate two sides are respectively connected with positive pole pressing plate and positive pole encapsulated positive pole structure from top to bottom in turn and be connected with negative pole pressing plate and negative pole encapsulated negative pole structure from top to bottom in turn, the light aluminum plate below is connected with lower gasket by negative pole connecting piece welding plate and positive pole connecting piece welding plate, and positive pole, negative pole pressing plate, positive pole, negative pole encapsulation and positive pole, negative pole connecting piece welding plate are connected by rivet riveting as a whole battery cover plate structure.The present application uses rivet riveting in the present application, it is not necessary to punch when riveting, ensure the sealing property of rivet riveting.Solve the existing technology in battery cover riveting light aluminum plate, lower gasket, pressing plate leave riveting hole, by interference fit, make pole and pressing plate connect together, overall assembly process is complex, the requirement of strict cooperation to component, cost is higher, prone to sealing failure, lead to leakage and other problems.

Description

Technical Field

[0001] This invention belongs to the field of lithium battery technology, and particularly relates to a battery cover and a battery. Background Technology

[0002] In existing technologies, battery cover riveting typically involves using a plain aluminum plate, a lower gasket, and a pressure plate with riveting holes. An interference fit is used to connect the terminal post to the pressure plate, and then welding is employed to strengthen the connection. For example:

[0003] Patent document CN 217444511 U discloses a battery cover plate. A positive electrode rivet passes sequentially through a sealing ring, a stop frame, a substrate, a positive electrode anti-rotation plate, and a positive electrode pressure plate for riveting. A negative electrode rivet passes sequentially through the same components. A positive electrode adapter plate is welded below the positive electrode rivet, and a negative electrode adapter plate is welded below the negative electrode rivet. An explosion-proof hole is located in the center of the substrate, and an explosion-proof plate is installed inside the hole. An explosion-proof valve dustproof sticker is installed on the top of the explosion-proof hole. An injection hole is located on the substrate, and a sealing nail and a sealing plate are sealed inside the injection hole. Cylindrical positioning grooves are also provided at both ends of the substrate. Cylindrical positioning through holes on the positive and negative electrode anti-rotation plates are connected to the positioning grooves via nested cylindrical positioning posts.

[0004] Patent document CN 209169203 U discloses a lithium iron phosphate battery cover plate. The connecting angle between the positive electrode connecting piece and the negative electrode connecting piece is 90 degrees. The positive electrode rivet passes through the rivet holes of the stop frame, the substrate, the positive electrode weak conductor plate and one of the pressure plates in sequence, and the top end is riveted to the pressure plate. The negative electrode rivet passes through the rivet holes of the stop frame, the substrate, the negative electrode insulating plate and another pressure plate in sequence, and the top end is riveted to the pressure plate. The positive electrode connecting piece is laser spot welded to the bottom of the positive electrode rivet, and the negative electrode connecting piece is laser spot welded to the bottom of the negative electrode rivet. An integrated explosion-proof hole is opened in the center of the substrate, and an integrated explosion-proof film and a combined film are installed in the explosion-proof hole. An injection hole is opened on the left side of the substrate.

[0005] Patent document CN 106299172 A discloses a lithium-ion battery cover plate, including a substrate. The substrate has positive electrode riveting holes and negative electrode riveting holes arranged at intervals. Sealing and insulating gaskets are provided in the positive electrode riveting holes and negative electrode riveting holes. Positive electrode pressure plates and negative electrode pressure plates are respectively provided on the upper end face of the sealing and insulating gaskets. The positive electrode pressure plates and negative electrode pressure plates are riveted together by positive electrode rivets and negative electrode rivets, respectively.

[0006] The above-mentioned battery cover assembly process is complex, has strict requirements for the fit of parts, is costly, and is prone to sealing failure, leading to problems such as leakage. There is an urgent need to introduce a new type of battery cover connection structure. Summary of the Invention

[0007] The present invention aims to overcome the shortcomings of the prior art by providing a battery cover and a battery. The battery cover is connected by a riveting method, which eliminates the need for drilling holes during riveting, ensures that the connecting pieces do not penetrate the battery, and eliminates the need for additional sealing structures, thus ensuring the sealing performance of the riveting.

[0008] To achieve the above objectives, the present invention employs the following technical solution:

[0009] On one hand, the present invention provides a battery cover plate, including a plain aluminum plate. On both sides of the plain aluminum plate, a positive electrode pressure plate and a positive electrode coating are connected sequentially from top to bottom to form a positive electrode structure, and a negative electrode pressure plate and a negative electrode coating are connected sequentially from top to bottom to form a negative electrode structure. The plain aluminum plate is connected to a lower pad through a negative electrode connecting plate and a positive electrode connecting plate. The positive and negative electrode pressure plates, the positive and negative electrode coatings, and the positive and negative electrode connecting plates are riveted together to form an integral battery cover plate structure.

[0010] Furthermore, the positive electrode plate and the negative electrode plate are square in shape.

[0011] Furthermore, the positive electrode coating and the negative electrode coating are provided with first grooves that respectively contain the positive electrode plate and the negative electrode plate.

[0012] Furthermore, the aluminum plate has second grooves on both sides that contain the positive and negative electrode coatings.

[0013] Furthermore, the second groove on the riveted negative electrode structure side of the aluminum plate is provided with a mounting hole, and a sealing ring is built into the mounting hole to form a sealed and insulated negative electrode structure.

[0014] Furthermore, the mounting hole is a stepped concave hole.

[0015] Furthermore, a boss is provided on the lower surface of the negative electrode coating at the position corresponding to the mounting hole of the aluminum plate. When the negative electrode pressure plate and the negative electrode coating are riveted together, the sealing ring is compressed by the boss.

[0016] Furthermore, the riveting method of the positive electrode structure is such that the current of the battery cover plate electrical connection is obtained by the positive electrode connecting plate welding plate through locking and riveting, so that the positive electrode pressure plate and the light aluminum plate are positively charged; when the battery cover plate electrical connection is not in a positively charged state, the riveting method of the negative electrode structure is adopted.

[0017] Furthermore, the rivet used is a commercially available rivet with a diameter of Φ3mm-Φ12mm.

[0018] The present invention also provides a battery, including the battery cover as described above.

[0019] Beneficial effects: This invention uses a locking and riveting method, which eliminates the need for drilling during riveting, ensuring the sealing of the locking and riveting. This solves the problems in the prior art where the battery cover riveting uses a bare aluminum plate, a lower gasket, and a pressure plate with riveting holes. Through interference fit, the terminal post is connected to the pressure plate, resulting in a complex overall assembly process, strict requirements for component fit, high cost, and a tendency for sealing failure and leakage. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the components after the battery cover has been disassembled;

[0021] Figure 2 This is a cross-sectional view of the positive electrode assembly of the battery cover.

[0022] Figure 3 This is a cross-sectional view of the negative electrode assembly of the battery cover.

[0023] In the diagram: 1. Plain aluminum plate; 2. Positive electrode structure; 2-1. Positive electrode pressure plate; 2-2. Positive electrode coating; 2-3. Positive electrode connecting plate; 3. Negative electrode structure; 3-1. Negative electrode pressure plate; 3-2. Negative electrode coating; 3-2-1. Boss; 3-3. Negative electrode connecting plate; 4. Lower gasket; 5. Rivet; 6. First groove; 7. Second groove; 8. Mounting hole; 9. Sealing ring. Detailed Implementation

[0024] The specific embodiments provided by the present invention are described in detail below with reference to preferred embodiments:

[0025] See appendix for details Figure 1-3 This embodiment provides a battery, which includes a battery cover plate. The battery cover plate includes a plain aluminum plate 1. On both sides of the plain aluminum plate, a positive electrode structure 2 consisting of a positive electrode pressure plate 2-1 and a positive electrode coating 2-2 are connected sequentially from top to bottom, and a negative electrode structure 3 consisting of a negative electrode pressure plate 3-1 and a negative electrode coating 3-2 are connected sequentially from top to bottom. The bottom of the plain aluminum plate is connected to a lower gasket 4 through a negative electrode connecting plate 3-3 and a positive electrode connecting plate 2-3. The positive and negative electrode pressure plates, positive and negative electrode coatings, and positive and negative electrode connecting plates are riveted together by locking rivets 5 to form an integral battery cover plate structure.

[0026] The positive electrode plate and the negative electrode plate are square in shape.

[0027] The positive electrode coating and the negative electrode coating are provided with first grooves 6 that respectively contain the positive electrode plate and the negative electrode plate.

[0028] The aluminum plate 1 has second grooves 7 on both sides to contain the positive and negative electrode coatings.

[0029] The second groove 7 on the riveted negative electrode structure side of the aluminum plate is provided with a mounting hole 8. A sealing ring 9 is built into the mounting hole, which together with the lower gasket 4 forms a sealed and insulated negative electrode structure. The mounting hole is a stepped concave hole.

[0030] The lower surface of the negative electrode coating is provided with a boss 3-2-1 corresponding to the mounting hole of the aluminum plate. When the negative electrode pressure plate and the negative electrode coating are riveted together, the sealing ring is compressed by the boss 3-2-1.

[0031] The negative electrode with a 3-2-1 encapsulated boss has the following advantages: Traditional riveting deforms the rivet and squeezes the sealing ring after the rivet is inserted, resulting in uneven deformation and possible poor sealing after riveting. The locking rivet is hollow with uniform wall thickness on all four sides, and the deformation during riveting is more uniform than that of riveting. This makes the force squeezing the sealing ring evenly distributed, which can better achieve a uniform sealing effect and is less likely to cause leakage due to insufficient compression on one side.

[0032] The aluminum plate has recesses. When a sealing ring is placed into a through hole, part of it will be placed in the recess for enhanced sealing.

[0033] Since the aluminum plate is positively charged, the negative electrode needs to be isolated from it. The rubber-coated boss of the negative electrode is placed inside the sealing ring, and the rivet penetrates the rubber-coated boss of the negative electrode so as not to come into contact with the aluminum plate, thereby achieving insulation.

[0034] The negative electrode connecting plate is insulated from the aluminum plate by a lower gasket, which prevents the two from contacting each other and achieves insulation.

[0035] The riveting method of the positive electrode structure is such that the current of the battery cover plate electrical connection is obtained by the positive electrode connecting plate welding plate through locking and riveting, so that the positive electrode pressure plate and the light aluminum plate are in a state of positive charge; when the battery cover plate electrical connection is not in a state of positive charge structure, the riveting method of negative electrode structure is adopted.

[0036] The locking rivets used are commercially available rivets.

[0037] The diameter of the locking rivet is Φ3mm-Φ12mm, and the thickness of the pressure plate is less than the length of the locking rivet and the total thickness of the pressure plate + the plain aluminum plate + the connecting plate.

[0038] The lower gasket is a standard component and will not be described in detail.

[0039] Working process and principle

[0040] This solution involves placing the pressure plate, aluminum plate, positive electrode coating, negative electrode coating, positive electrode connecting plate, negative electrode connecting plate, and lower gasket in fixed positions, then riveting them together using a locking and riveting method. This pressure plate is square; after slotting the aluminum plate, no additional anti-rotation structure is needed. Figure 1 , 3As shown, the positive electrode pressure plate, positive electrode coating, aluminum plate positive electrode riveting joint, and lower gasket riveting joint of the positive electrode structure do not require riveting holes. Instead, rivets are directly driven into the material using a locking riveting method. Figure 1 As shown, after the rivet is driven in, the positive electrode connecting plate is not pierced; only the tail of the rivet is driven into the material. This locking and riveting provides excellent sealing, achieving a seal without the need for additional sealing structures. The cover plate's electrical connection involves current flowing from the positive electrode connecting plate through the rivet to positively charge the positive electrode pressure plate and the aluminum plate. If a positively charged cover plate structure is not required, the negative electrode riveting method can be referenced. Figure 1 The positions of some components may be adjusted during actual use.

[0041] like Figure 2 , 3 As shown, the negative electrode pressure plate, negative electrode coating, and lower gasket riveting joints of the negative electrode structure do not require riveting holes. Riveting is used to directly drive the rivets into the material. The negative electrode requires insulation design; the bare aluminum plate cannot directly contact the rivets. Mounting holes are provided in the bare aluminum plate, and sealing rings are installed in the mounting holes. For example... Figure 3 As shown, the negative electrode coating has a boss 3-2-1, which mates with the mounting holes of the aluminum plate. Rivets are driven into the negative electrode coating, and the material deforms to further compress the sealing ring, thus achieving sealing and insulation. The rivets, driven into the negative electrode coating boss, contact the negative electrode connecting plate, allowing the negative electrode current to flow from the negative electrode connecting plate to the negative electrode pressure plate.

[0042] The above detailed description of a riveting connection structure for a battery cover, with reference to the embodiments, is illustrative rather than limiting. Several embodiments can be listed within the defined scope. Therefore, variations and modifications that do not depart from the overall concept of the present invention should be within the protection scope of the present invention.

Claims

1. A battery cover, characterized in that: The battery includes a bare aluminum plate, on both sides of which a positive electrode pressure plate and a positive electrode coating are connected sequentially from top to bottom to form a positive electrode structure, and a negative electrode pressure plate and a negative electrode coating are connected sequentially from top to bottom to form a negative electrode structure. The bare aluminum plate is connected to a lower pad through a negative electrode connecting plate and a positive electrode connecting plate. The positive electrode pressure plate, negative electrode pressure plate, positive electrode coating, negative electrode coating, positive electrode connecting plate, and negative electrode connecting plate are riveted together to form an integral battery cover structure. The positive electrode plate and the negative electrode plate are square in shape; The aluminum plate has a second groove on each side that encloses the positive electrode coating and the negative electrode coating, respectively. The second groove on the side of the riveted negative electrode structure of the aluminum plate is provided with an installation hole, and a sealing ring is built into the installation hole to form a sealed and insulated negative electrode structure. The lower surface of the negative electrode coating is provided with a boss at the position of the mounting hole of the aluminum plate. When the negative electrode pressure plate and the negative electrode coating are riveted together, the sealing ring is compressed by the boss.

2. The battery cover according to claim 1, characterized in that: The positive electrode coating and the negative electrode coating are provided with first grooves that respectively contain the positive electrode plate and the negative electrode plate.

3. The battery cover according to claim 1, characterized in that: The mounting hole is a stepped concave hole.

4. The battery cover according to claim 1, characterized in that: The riveting method of the positive electrode structure is such that the current of the battery cover plate electrical connection is obtained by the positive electrode connecting plate welding plate through locking and riveting, so that the positive electrode pressure plate and the light aluminum plate are in a state of positive charge; when the battery cover plate electrical connection is not in a state of positive charge structure, the riveting method of negative electrode structure is adopted.

5. The battery cover according to claim 1, characterized in that: The rivets used are commercially available rivets with a diameter of Φ3mm-Φ12mm.

6. A battery comprising the battery cover as described in any one of claims 1-5.

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