Secondary battery cover plate and secondary battery

Abstract

The utility model provides a secondary battery cover plate and a secondary battery, and relates to the technical field of secondary battery, the secondary battery cover plate comprises a top cover sheet, a lower plastic cement and a positive pole connecting sheet, one side of the top cover sheet far away from the lower plastic cement is provided with an upper bulge and forms a positive pole post, and the upper bulge is arranged corresponding to an upper assembly hole; a first through hole corresponding to the upper assembly hole is formed in the lower plastic; the positive electrode connecting piece is provided with an upper assembly bulge, the upper assembly bulge penetrates through the first through hole and is assembled in the upper assembly hole, and the upper assembly bulge is welded with the inner wall of the upper assembly hole. According to the secondary battery cover plate provided by the utility model, the upper end surface of the top cover plate is provided with the upper bulge and forms the upper assembly hole, the upper assembly bulge of the positive electrode connecting plate can be assembled in the upper assembly hole and is welded by laser, and the positive electrode connecting plate is connected with the top cover plate, so that the problems of sealing, dislocation and the like caused by poor laser welding can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of secondary batteries, in particular to a secondary battery cover plate and a secondary battery. Background Art

[0002] In general, the shell and top cover of secondary batteries form a cavity that contains electrolyte and battery cells. The shell and top cover are usually made of aluminum. Due to the presence of electrolyte, when the battery is in use, the aluminum shell will corrode due to the galvanic cell effect, affecting the normal use of the battery.

[0003] In order to prevent the aluminum shell from corrosion, the current method is to connect the top cover sheet to the positive electrode to increase the voltage of the aluminum shell to prevent corrosion. The electrical connection between the top cover sheet and the positive electrode is generally to integrate the top cover with the positive electrode column; when assembling the top cover assembly, not only the sealing problem between the top cover sheet and the positive electrode column must be considered, but also the resistance problem after laser welding the positive electrode column cap and poor laser welding problems must be considered; and this top cover processing technology is extremely difficult. Utility Model Content

[0004] The utility model aims to provide a secondary battery cover plate and a secondary battery, so as to alleviate the technical problems of the existing top cover plate and the positive pole being integrally connected, which are prone to sealing problems and poor welding.

[0005] The utility model provides a secondary battery cover plate, comprising a top cover sheet, a lower plastic and a positive electrode connecting sheet, wherein an upper assembly hole is arranged on a side of the top cover sheet facing the lower plastic, an upper protrusion is arranged on a side of the top cover sheet away from the lower plastic and forms a positive electrode column, and the upper protrusion is arranged corresponding to the upper assembly hole;

[0006] A first through hole corresponding to the upper assembly hole is arranged on the lower plastic; the positive electrode connecting piece has an upper assembly protrusion, the upper assembly protrusion passes through the first through hole and is assembled in the upper assembly hole, and the upper assembly protrusion is welded to the inner wall of the upper assembly hole.

[0007] In an optional embodiment, the upper assembly hole is a circular hole or a rectangular hole.

[0008] In an optional embodiment, the positive electrode connecting piece includes a connecting piece body, an upper assembly protrusion and at least one branch connecting piece, wherein the upper assembly protrusion is arranged at the upper end of the connecting piece body, the branch connecting piece is arranged on the connecting piece body, and the branch connecting piece is used to connect to the pole ear of the battery cell.

[0009] In an optional embodiment, a lower punch hole is provided on the connecting piece body, and the lower punch hole is provided corresponding to the upper assembly protrusion.

[0010] In an optional embodiment, two branch connection pieces are provided on the connection piece main body.

[0011] In an optional embodiment, a negative electrode column is further included, the top cover sheet is provided with a mounting hole, the negative electrode column includes an upper connecting plate, a negative electrode column body and a lower connecting plate; the upper end of the negative electrode column body is provided with the upper connecting plate, and the lower end is provided with the lower connecting plate;

[0012] The negative electrode column body is inserted into the mounting hole, and the upper connecting plate is located at the upper end of the top cover plate, and the lower connecting plate is located at the lower end of the top cover plate;

[0013] A sealing ring and the upper plastic are sleeved on the negative pole body; the upper plastic is located at the upper end of the top cover sheet, the sealing ring is located at the lower end of the top cover sheet, and the upper plastic and the sealing ring cooperate to seal the gap between the negative pole body and the mounting hole.

[0014] In an optional embodiment, a plurality of upper grooves are provided on the top cover sheet, and the plurality of upper grooves are evenly arranged along the circumference of the mounting hole;

[0015] The upper plastic is provided with an upper positioning protrusion matching the upper groove.

[0016] In an optional embodiment, a lower mounting groove communicating with the mounting hole is provided on the lower end surface of the top cover sheet;

[0017] A limiting protrusion is provided on the upper end surface of the lower plastic, and the limiting protrusion is assembled in the lower mounting groove;

[0018] The limiting protrusions surround a lower limiting hole and form an assembly groove on the lower end surface of the lower plastic; the lower connecting plate is assembled in the assembly groove.

[0019] In an optional embodiment, a plurality of positioning grooves are provided on the circumference of the negative electrode column body, and a positioning protrusion matching the positioning grooves is provided on the lower plastic.

[0020] The upper end surface of the top cover sheet of the secondary battery cover provided by the utility model has an upper protrusion and forms an upper assembly hole. The upper assembly protrusion of the positive electrode connecting sheet can be assembled into the upper assembly hole and connected to the top cover sheet by laser welding, which can avoid problems such as sealing and misalignment caused by poor laser welding.

[0021] The utility model provides a secondary battery, comprising the secondary battery cover plate described in any one of the above-mentioned implementation modes.

[0022] Compared with the prior art, the secondary battery provided by the utility model has the secondary battery cover provided by the utility model, and thus has all the beneficial effects of the secondary battery cover provided by the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic diagram of the structure of a secondary battery cover provided by an embodiment of the utility model;

[0025] Figure 2 for Figure 1 A schematic structural diagram of a longitudinal section of a secondary battery cover shown;

[0026] Figure 3 for Figure 2 A partial enlarged view of A of the structural schematic diagram of the longitudinal section of the secondary battery cover shown;

[0027] Figure 4 for Figure 2 A partial enlarged view of B of the structural schematic diagram of the longitudinal section of the secondary battery cover shown;

[0028] Figure 5 for Figure 1 The schematic diagram of the structure of the lower plastic of the secondary battery cover is shown;

[0029] Figure 6 for Figure 1 A schematic structural diagram of the lower plastic of the secondary battery cover from another angle;

[0030] Figure 7 for Figure 1 A schematic structural diagram of a top cover sheet of a secondary battery cover plate shown;

[0031] Figure 8 for Figure 7 A schematic structural diagram of a longitudinal section of the top cover sheet shown;

[0032] Fig. 9 for Figure 1 A schematic structural diagram of a positive electrode connecting piece of a secondary battery cover plate shown;

[0033] Fig.10 for Figure 1 A schematic structural diagram of the positive electrode connecting piece of the secondary battery cover plate from another angle;

[0034] Fig.11 for Figure 1 A schematic diagram of the structure of the connection between the negative pole of the secondary battery cover and the upper plastic;

[0035] Fig.12 for Figure 1 The schematic diagram of the structure of the connection between the negative pole post and the sealing ring of the secondary battery cover is shown.

[0036] Icon: 100-top cover piece; 200-lower plastic; 300-upper protrusion; 400-connecting piece body; 500-upper assembly protrusion; 600-lower punching hole; 700-upper groove; 800-first perforation; 900-assembly groove; 110-lower limit hole; 120-limiting protrusion; 130-branch connecting piece; 140-mounting hole; 150-upper plastic; 160-sealing ring; 170-upper positioning protrusion; 180-lower mounting groove; 190-lower connecting plate; 210-negative pole body; 220-upper connecting plate; 230-positioning groove; 240-positioning protrusion; 250-upper assembly hole. DETAILED DESCRIPTION

[0037] The terms “first”, “second”, “third”, etc. are only used for distinguishing descriptions and do not indicate the order of arrangement, nor can they be understood as indicating or implying relative importance.

[0038] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0039] In the description of the present application, it should be noted that the terms "inside", "outside", "left", "right", "up", "down", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the products of the present application are usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0040] In the description of this application, unless otherwise clearly specified and limited, the terms "set", "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0041] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings.

[0042] Reference Figure 1-Figure 12 The utility model provides a secondary battery cover plate, comprising a top cover sheet 100, a lower plastic 200 and a positive electrode connecting sheet, wherein an upper assembly hole 250 is provided on a side of the top cover sheet 100 facing the lower plastic 200, an upper protrusion 300 is provided on a side of the top cover sheet 100 away from the lower plastic 200 and forms a positive electrode column, and the upper protrusion 300 is provided corresponding to the upper assembly hole 250;

[0043] A first through hole 800 corresponding to the upper assembly hole 250 is provided on the lower plastic 200 ; the positive electrode connecting plate has an upper assembly protrusion 500 , the upper assembly protrusion 500 passes through the first through hole 800 and is assembled in the upper assembly hole 250 , and the upper assembly protrusion 500 is welded to the inner wall of the upper assembly hole 250 .

[0044] In some embodiments, the upper assembly hole 250 of the top cover sheet 100 of the secondary battery cover plate is generally punched out by a forming process such as stamping, extrusion, cold drawing, etc. to form an upper protrusion 300, and the upper protrusion 300 forms a positive electrode column.

[0045] The positive electrode connecting piece has an upper assembly protrusion 500, which matches the upper assembly hole 250. The upper assembly protrusion 500 passes through the first through hole 800 and is assembled in the upper assembly hole 250. The upper assembly protrusion 500 is welded to the inner wall of the upper assembly hole 250 by laser welding to achieve the connection between the upper assembly protrusion 500 and the top cover sheet 100. The lower plastic 200 is located between the top cover sheet 100 and the positive electrode connecting piece, which can achieve shock absorption and other efficiency.

[0046] Generally, the top cover sheet 100 is made of metal, generally aluminum or other metals commonly used for the top cover sheet 100 .

[0047] In an optional embodiment, the upper assembly hole 250 is a circular hole or a rectangular hole.

[0048] In some embodiments, the upper assembly hole 250 is generally a circular hole or a rectangular hole, and may also be other shapes, that is, the upper protrusion 300 forms a cylinder or a rectangular column; the upper assembly protrusion 500 on the positive electrode connecting sheet has a shape matching that of the upper assembly hole 250.

[0049] Reference Fig. 9 and Fig.10In an optional embodiment, the positive electrode connecting piece includes a connecting piece body 400, an upper assembly protrusion 500 and at least one branch connecting piece 130, wherein the upper assembly protrusion 500 is arranged at the upper end of the connecting piece body 400, the branch connecting piece 130 is arranged on the connecting piece body 400, and the branch connecting piece 130 is used to connect to the pole ear of the battery cell.

[0050] In an optional embodiment, a lower punch hole 600 is provided on the connecting piece body 400 , and the lower punch hole 600 is provided corresponding to the upper assembly protrusion 500 .

[0051] In some embodiments, the connecting piece body 400 generally uses a forming process such as stamping, extrusion, and cold drawing to punch out the lower punch hole 600 and form the upper assembly protrusion 500; generally, the connecting piece body 400 is circular, and the outer diameter of the connecting piece body 400 is larger than the inner diameter of the first through hole 800, that is, the connecting piece body 400 cannot pass through the first through hole 800, and the connecting piece body 400 and the top cover piece 100 cooperate to clamp the lower plastic 200.

[0052] In an optional embodiment, two branch connection pieces 130 are provided on the connection piece main body 400 .

[0053] A branch connecting piece 130 is arranged on the connecting piece main body 400, and generally two branch connecting pieces 130 are arranged; generally, the positive pole ear of the battery cell forms two positive pole ear parts, and each positive pole ear part is connected to a branch connecting piece 130. When multiple positive pole ears of the battery cell are superimposed to form a positive pole ear part, a branch connecting piece 130 is arranged on the connecting piece main body 400.

[0054] Reference Fig.11 and Fig.12 In an optional embodiment, a negative electrode column is further included, the top cover sheet 100 is provided with a mounting hole 140, and the negative electrode column includes an upper connecting plate 220, a negative electrode column body 210 and a lower connecting plate 190; the upper end of the negative electrode column body 210 is provided with the upper connecting plate 220, and the lower end is provided with the lower connecting plate 190;

[0055] The negative electrode column body 210 is inserted into the mounting hole 140 , and the upper connecting plate 220 is located at the upper end of the top cover sheet 100 , and the lower connecting plate 190 is located at the lower end of the top cover sheet 100 ;

[0056] The negative electrode column body 210 is sleeved with a sealing ring 160 and the upper plastic 150; the upper plastic 150 is located at the upper end of the top cover sheet 100, and the sealing ring 160 is located at the lower end of the top cover sheet 100, and the upper plastic 150 and the sealing ring 160 cooperate to seal the gap between the negative electrode column body 210 and the mounting hole 140.

[0057] In some embodiments, the secondary battery cover plate further has a negative electrode column, a mounting hole 140 is provided on the top cover sheet 100, an upper connecting plate 220 of the negative electrode column is located at the upper end of the top cover sheet 100, a lower connecting plate 190 is located at the lower end of the top cover sheet 100, and a negative electrode column body 210 is passed through the mounting hole 140;

[0058] A sealing ring 160 is sleeved on the negative electrode column body 210. Generally, an upper plastic 150 is formed by injection molding on the top cover sheet 100 using an injection molding machine. The upper plastic 150 can enter the gap between the negative electrode column body 210 and the mounting hole 140. The upper plastic and the sealing ring 160 cooperate to physically isolate the negative electrode column body 210 and the top cover sheet 100 to avoid direct contact between the negative electrode column body 210 and the top cover sheet 100.

[0059] Reference Figure 7 In an optional embodiment, a plurality of upper grooves 700 are provided on the top cover sheet 100, and the plurality of upper grooves 700 are evenly arranged along the circumference of the mounting hole 140;

[0060] The upper plastic 150 is provided with an upper positioning protrusion 170 matching the upper groove 700 .

[0061] A plurality of upper grooves 700 are provided on the upper end surface of the top cover sheet 100. During the injection molding process of the upper plastic 150, the upper plastic 150 is filled into the upper grooves 700 and forms upper positioning protrusions 170, thereby ensuring that the upper plastic 150 is firmly connected to the top cover sheet 100 and preventing the upper plastic 150 from rotating.

[0062] Reference Figure 4 In an optional embodiment, a lower mounting groove 180 communicating with the mounting hole 140 is provided on the lower end surface of the top cover sheet 100;

[0063] A limiting protrusion 120 is provided on the upper end surface of the lower plastic 200, and the limiting protrusion 120 is assembled in the lower mounting groove 180;

[0064] The limiting protrusions 120 surround the lower limiting hole 110 and form an assembly groove 900 on the lower end surface of the lower plastic 200 ; the lower connecting plate 190 is assembled in the assembly groove 900 .

[0065] In some embodiments, a lower mounting groove 180 is provided on the lower end surface of the top cover sheet 100, and a limiting protrusion 120 is provided on the lower plastic 200, the limiting protrusion 120 can be assembled into the lower mounting groove 180, and the lower connecting plate 190 is assembled into the lower limiting hole 110 of the limiting protrusion 120; after the negative pole is inserted into the lower limiting hole 110, it is inserted into the mounting hole 140 of the top cover sheet 100, so that the lower connecting plate 190 is fixed in the lower limiting hole 110 of the lower plastic 200, and the negative pole makes the lower plastic 200 tightly abut against the top cover sheet 100.

[0066] Reference Figure 4 and Fig.12 In an optional embodiment, a plurality of positioning grooves 230 are provided on the circumferential side of the negative electrode column body 210 , and a positioning protrusion 240 matching the positioning grooves 230 is provided on the lower plastic 200 .

[0067] In an optional embodiment, an explosion-proof valve is provided on the top cover sheet 100 .

[0068] In some embodiments, a plurality of positioning grooves 230 are provided on the circumferential side of the negative electrode column body 210, and the upper plastic 150 forms positioning protrusions 240 matching the positioning grooves 230 during the injection molding process; in this way, the negative electrode column body 210 and the upper plastic 150 are relatively fixed, making the negative electrode column body 210 not easy to rotate.

[0069] The upper end surface of the top cover sheet 100 of the secondary battery cover provided by the utility model has an upper protrusion 300 and forms an upper assembly hole 250. The upper assembly protrusion 500 of the positive electrode connecting sheet can be assembled into the upper assembly hole 250 and connected to the top cover sheet 100 by laser welding, which can avoid problems such as sealing and misalignment caused by poor laser welding.

[0070] The utility model provides a secondary battery, comprising the secondary battery cover plate described in any one of the above-mentioned implementation modes.

[0071] Compared with the prior art, the secondary battery provided by the utility model has the secondary battery cover provided by the utility model, and thus has all the beneficial effects of the secondary battery cover provided by the utility model.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A secondary battery cover, characterized in that: The invention comprises a top cover sheet (100), a lower plastic (200) and a positive electrode connecting sheet, wherein an upper assembly hole (250) is arranged on a side of the top cover sheet (100) facing the lower plastic (200), an upper protrusion (300) is arranged on a side of the top cover sheet (100) away from the lower plastic (200) to form a positive electrode column, and the upper protrusion (300) is arranged corresponding to the upper assembly hole (250); A first through hole (800) corresponding to the upper assembly hole (250) is provided on the lower plastic (200); the positive electrode connecting plate has an upper assembly protrusion (500), the upper assembly protrusion (500) passes through the first through hole (800) and is assembled in the upper assembly hole (250), and the upper assembly protrusion (500) is welded to the inner wall of the upper assembly hole (250).

2. The secondary battery cover according to claim 1, characterized in that: The upper assembly hole (250) is a circular hole or a rectangular hole.

3. The secondary battery cover according to claim 1, characterized in that: The positive electrode connecting piece comprises a connecting piece body (400), an upper assembly protrusion (500) and at least one branch connecting piece (130), wherein the upper assembly protrusion (500) is arranged at the upper end of the connecting piece body (400), the branch connecting piece (130) is arranged on the connecting piece body (400), and the branch connecting piece (130) is used to be connected to the pole ear of the battery cell.

4. The secondary battery cover according to claim 3, characterized in that: A lower punch hole (600) is provided on the connecting piece body (400), and the lower punch hole (600) is provided corresponding to the upper assembly protrusion (500).

5. The secondary battery cover plate according to claim 3, characterized in that: Two branch connection pieces (130) are arranged on the connection piece main body (400).

6. The secondary battery cover according to claim 1, characterized in that: It also includes a negative electrode column, wherein the top cover sheet (100) is provided with a mounting hole (140), and the negative electrode column includes an upper connecting plate (220), a negative electrode column body (210), and a lower connecting plate (190); the upper end of the negative electrode column body (210) is provided with the upper connecting plate (220), and the lower end is provided with the lower connecting plate (190); The negative electrode column body (210) is inserted into the mounting hole (140), the upper connecting plate (220) is located at the upper end of the top cover sheet (100), and the lower connecting plate (190) is located at the lower end of the top cover sheet (100); The negative electrode column body (210) is sleeved with a sealing ring (160) and an upper plastic (150); the upper plastic (150) is located at the upper end of the top cover sheet (100), the sealing ring (160) is located at the lower end of the top cover sheet (100), and the upper plastic (150) and the sealing ring (160) cooperate to seal the gap between the negative electrode column body (210) and the mounting hole (140).

7. The secondary battery cover according to claim 6, characterized in that: The top cover sheet (100) is provided with a plurality of upper grooves (700), and the plurality of upper grooves (700) are evenly arranged along the circumference of the mounting hole (140); The upper plastic (150) is provided with an upper positioning protrusion (170) matching the upper groove (700).

8. The secondary battery cover according to claim 6, characterized in that: A lower mounting groove (180) communicating with the mounting hole (140) is provided on the lower end surface of the top cover sheet (100); A limiting protrusion (120) is provided on the upper end surface of the lower plastic (200), and the limiting protrusion (120) is assembled in the lower mounting groove (180); The limiting protrusion (120) surrounds a lower limiting hole (110) and forms an assembly groove (900) on the lower end surface of the lower plastic (200); the lower connecting plate (190) is assembled in the assembly groove (900).

9. The secondary battery cover according to claim 6, characterized in that: A plurality of positioning grooves (230) are arranged on the peripheral side of the negative electrode column body (210), and a positioning protrusion (240) matching the positioning grooves (230) is arranged on the lower plastic (200).

10. A secondary battery, characterized in that: A secondary battery cover plate comprising any one of claims 1 to 9.

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