Top cover structure of full-tab battery

Abstract

The utility model provides a full-tab battery top cover structure which comprises a core bag, two connecting sheets, an aluminum shell and an upper cover, and a positive tab and a negative tab are respectively arranged on two opposite short sides of the core bag; each connecting piece comprises a first part and a second part which are mutually connected and integrally formed, the included angle between the first part and the second part is 90 degrees, the first part extends outwards to form a boss and is inwards attached to the longer part of the core package in an insulating manner, and the second part is connected with the tab; the aluminum shell wraps the outer side of the core bag, an opening is formed in the long face of the core bag, and the aluminum shell abuts against the two short sides of the core bag in an insulating mode. The upper cover is buckled with the opening of the aluminum shell, the upper cover is provided with two through holes, the two connecting sheets are clamped between the upper cover and the core package, and bosses on the two connecting sheets penetrate out of the through holes. The utility model effectively solves the problem of space waste caused by large top tab reservation and structural member occupation, fully utilizes the internal space of the battery, and improves the cell performance and energy density.

Description

Technical Field

[0001] This utility model relates to the field of new energy technology, specifically to a novel battery top cover structure with full tabs. Background Technology

[0002] In recent years, with the reduction in manufacturing and raw material costs and the gradual improvement in battery cycle life, lithium batteries are now widely used in automobiles and energy storage. Whether for power batteries or energy storage batteries, increasing capacity within the same volume is an important research direction with significant economic value.

[0003] There are two main directions for improving the volumetric energy density of battery cells: increasing the unit capacity of raw materials and improving the utilization rate of internal space. Considering safety and the expansion of the battery cell during charging and discharging, the front, back, left and right spaces inside the battery cell have been fully utilized, but there is still a huge amount of space left at the top of the battery cell. Usually, a space of 10-13mm is reserved during the design to place structural components and tabs. Therefore, how to reasonably reduce the top space has become an important research direction for improving the utilization rate of battery cell space.

[0004] There are two main reasons for the wasted space at the top of the battery cell;

[0005] 1: Traditional connecting piece welding requires the tab to be folded 90° after welding to the connecting piece. Bending will also occupy the internal height space of the cell and there is a risk of internal short circuit caused by the tab being inserted.

[0006] 2. In existing lithium / sodium battery technologies, the connection between the tabs and the top cover terminals mainly involves welding the tabs to an adapter plate, and then welding the adapter plate to the terminal. This process results in the adapter plate occupying battery space, increasing cost, and raising the cell's internal resistance.

[0007] Therefore, how to effectively solve the problem of wasted space caused by the large reserved space for top tabs and the occupation of structural components, make full use of the internal space of the battery, and improve the performance and energy density of the cell is an urgent problem to be solved in the industry. Utility Model Content

[0008] One of the main objectives of this invention is to overcome at least one of the defects of the prior art and provide a full-tab battery top cover structure that can effectively solve the problem of wasted space caused by large reserved top tabs and structural components, make full use of the internal space of the battery, and improve the performance and energy density of the battery cells.

[0009] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0010] According to one aspect of the present invention, a full-tab battery top cover structure is provided, comprising:

[0011] The core package has a positive electrode tab and a negative electrode tab respectively on its relatively shorter sides;

[0012] Two connecting pieces, each comprising a first part and a second part integrally formed and connected to each other, with an included angle of 90 degrees between the first part and the second part, the first part having a protrusion extending outward and insulated against the longer part of the core package, the second part being connected to the positive electrode tab and the negative electrode tab respectively;

[0013] An aluminum shell is wrapped around the outside of the core package and has an opening on the longer side of the core package. The aluminum shell is insulated and abuts against the shorter sides of the core package.

[0014] The top cover is fastened to the opening of the aluminum shell. The top cover has two through holes. Two connecting pieces are sandwiched between the top cover and the core package. The protrusions on the two connecting pieces protrude through the through holes.

[0015] According to one embodiment of the present invention, both the positive electrode tab and the negative electrode tab are omnipolar tabs.

[0016] According to one embodiment of the present invention, the connecting piece is provided with a slot, and both the positive electrode tab and the negative electrode tab pass through the slot and are welded to the connecting piece.

[0017] According to one embodiment of the present invention, a retaining bracket is provided on the inner side of the upper cover, and the retaining bracket is located between the upper cover and the connecting piece.

[0018] According to one embodiment of the present invention, an elastic insulating member is provided between the first part and the core package.

[0019] According to one embodiment of the present invention, an insulating gasket is provided between the boss and the through hole, the boss is a two-pole post, and an insulating sheet for the pole post is attached to the outer surface of the boss.

[0020] According to one embodiment of the present invention, an explosion-proof valve is provided between the two through holes.

[0021] According to one embodiment of the present invention, a protective film is affixed to the explosion-proof valve.

[0022] According to one embodiment of the present invention, the upper cover is provided with a liquid injection hole.

[0023] According to one embodiment of the present invention, the core package is wrapped with a transparent insulating film.

[0024] As can be seen from the above technical solution, the advantages and positive effects of the all-tab battery top cover structure of this utility model are as follows:

[0025] In this utility model, the included angle between the first part and the second part is 90 degrees. The first part extends outward with a protrusion and insulates against the longer part of the core package. This effectively solves the problem of wasted space caused by the large reserved top tab and the occupation of structural components, making full use of the internal space of the battery and improving the performance and energy density of the cell. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the top cover structure and core packaging of the all-tab battery of this utility model.

[0027] Figure 2 This is a schematic diagram of the top cover structure of the all-tab battery of this utility model.

[0028] Figure 3 This is a partially enlarged structural diagram of the assembled top cover structure of the all-tab battery of this utility model.

[0029] Figure 4 This is a schematic diagram of the assembly process of the various components of the all-tab battery top cover structure of this utility model.

[0030] Drawing number explanation:

[0031] 1-Aluminum casing;

[0032] 2-Core package;

[0033] 3-Elastic insulating component;

[0034] 4-First connecting piece; 41-First boss;

[0035] 5-Second connecting piece; 51-Second boss; 52-Opening;

[0036] 6-First insulating pad;

[0037] 7-Second insulating pad;

[0038] 8- Maintain the support;

[0039] 9-Top cover plate; 91-Injection hole; 92-First pole insulating gasket; 93-Second pole insulating gasket; 94-Explosion-proof valve; 95-Protective film;

[0040] 100-Transparent insulating film. Detailed Implementation

[0041] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0042] In the following description of various examples of the present invention, reference is made to the accompanying drawings, which form part of the present invention, and which illustrate by way of example different exemplary structures, systems, and steps that can implement various aspects of the present invention. It should be understood that other specific embodiments of the components, structures, exemplary devices, systems, and steps may be used, and structural and functional modifications may be made without departing from the scope of the present invention. Furthermore, although the terms “top,” “bottom,” “front,” “rear,” “side,” etc., may be used in this specification to describe various exemplary features and elements of the present invention, these terms are used herein only for convenience, such as the orientation according to the examples shown in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of the present invention.

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0044] Figure 1 This is a schematic diagram of the top cover structure and core packaging of the all-tab battery of this utility model.

[0045] Figure 2 This is a schematic diagram of the top cover structure of the all-tab battery of this utility model.

[0046] Figure 3 This is a partially enlarged structural diagram of the assembled top cover structure of the all-tab battery of this utility model.

[0047] Figure 4 This is a schematic diagram of the assembly process of the various components of the all-tab battery top cover structure of this utility model.

[0048] like Figures 1 to 4 As shown, this utility model provides a full-tab battery top cover structure, including:

[0049] Core package 2, wherein positive electrode tabs and negative electrode tabs are respectively provided on the relatively shorter sides of the core package 2;

[0050] The first connecting piece 4 and the second connecting piece 5 each include a first part and a second part that are integrally formed and connected to each other. The included angle between the first part and the second part is 90 degrees. The first part of the first connecting piece 4 extends outward with a first protrusion 41, and the first part of the second connecting piece extends outward with a second protrusion 51. The first part is insulated and abuts against the longer part of the core package 2. The second part is connected to the positive electrode tab and the negative electrode tab respectively.

[0051] An aluminum shell 1 is wrapped around the outside of the core package 2 and has an opening on the longer side of the core package 2. The aluminum shell 1 is insulated and attached to the shorter sides of the core package 2.

[0052] The upper cover 9 is fastened to the opening of the aluminum shell 1. The upper cover 9 is provided with two through holes. The first connecting piece 4 and the second connecting piece 5 are sandwiched between the upper cover 9 and the core package 2. The protrusion 41 on the first connecting piece 4 and the protrusion 51 on the second connecting piece 5 pass through the through holes to form the first pole post and the second pole post, respectively.

[0053] According to one embodiment of the present invention, both the positive electrode tab and the negative electrode tab are omnipolar tabs.

[0054] According to one embodiment of this utility model, both the first connecting piece 4 and the second connecting piece 5 are provided with slots. The positive electrode tab and the negative electrode tab both pass through the slots and are welded to the first connecting piece 4 and the second connecting piece 5. Because they are made of the same material, laser welding between them is simple and quick, and there will be no welding breakage or explosion phenomenon due to the different melting points of different metals.

[0055] According to one embodiment of the present invention, a retaining bracket 8 is provided on the inner side of the upper cover 9, and the retaining bracket 8 is located between the upper cover 9 and the first connecting piece 4 and the second connecting piece 5.

[0056] According to one embodiment of the present invention, an elastic insulating member 3 is provided between the first part and the core package 2.

[0057] According to one embodiment of the present invention, a first insulating pad 6 and a second insulating pad 7 are respectively provided between the first boss 41, the second boss 51 and the through hole. The first boss 41 and the second boss 51 are respectively the first pole post and the second pole post. The outer surfaces of the first boss 41 and the second boss 51 are respectively attached with a first pole post insulating sheet 92 and a second pole post insulating sheet 93.

[0058] According to one embodiment of the present invention, an explosion-proof valve 94 is provided between the two through holes.

[0059] According to one embodiment of the present invention, a protective film 95 is affixed to the explosion-proof valve 94.

[0060] According to one embodiment of the present invention, the upper cover 9 is provided with a liquid injection hole 91.

[0061] According to one embodiment of the present invention, the core package is wrapped with a transparent insulating film 100.

[0062] In some embodiments, the first boss 41 and the second boss 51 are separate terminal structures, which require a welding platform to be reserved below the top cover structure between them and the connecting piece, increasing the number of processes and reducing the overall cell assembly space.

[0063] In some embodiments, the retainer 8 and connecting piece 5 below the injection hole 91 are not provided with guide grooves or perforations, which affects the penetration efficiency of the electrolyte and reduces production efficiency.

[0064] In some embodiments, no elastic insulating sheet 3 is added between the core package 2 and the first connecting piece 4 and the second connecting piece 5. During assembly, the metal may easily scratch the diaphragm, causing a short circuit. During charging and discharging, the large overcurrent may cause the metal to heat up and melt the diaphragm, resulting in a short circuit.

[0065] In some embodiments, the first insulating pad 6 and the second insulating pad 7 are not designed as embedded structures, which cannot perfectly utilize the extra space at the bottom of the retainer 8, increasing the overall structural thickness by 0.5-1mm and reducing the overall cell assembly space.

[0066] In some embodiments, the first connecting piece 4 and the second connecting piece 5 are not L-shaped structures and need to be welded on the top of the cell. A 7-9mm extension space for the tabs needs to be reserved on the top to avoid the tabs tearing, which greatly reduces the overall cell assembly space and reduces the overall energy density.

[0067] In some embodiments, the first pole insulating gasket 92 and the second pole insulating gasket 93 are not designed as an under-mount structure. To achieve a good sealing effect, they need to be placed between the top cover 9 and the retaining bracket 8 for sealing, which increases the overall structural thickness by 1-1.5mm and reduces the overall cell assembly space.

[0068] In some embodiments, the explosion-proof valve protective membrane 95 is not designed with embossing. If a safety problem such as an internal short circuit occurs, the explosion-proof valve cannot release pressure according to the set safety threshold and safe injection direction, increasing the safety hazard.

[0069] As can be seen from the above technical solution, the advantages and positive effects of the all-tab lithium battery of this utility model are as follows:

[0070] In this utility model, the included angle between the first part and the second part is 90 degrees. The first part extends outward with a protrusion and insulates against the longer part of the core package. This effectively solves the problem of wasted space caused by the large reserved top tab and the occupation of structural components, making full use of the internal space of the battery and improving the performance and energy density of the cell.

[0071] Taking the manufacturing process of square aluminum-cased batteries as an example, refer to Figure 4 As shown. The specific steps are as follows:

[0072] 1. The square aluminum-cased battery in this embodiment includes a casing 1, a battery cell pack 2, a first connecting piece 4, a second connecting piece 5, and other structural components.

[0073] 2. The housing 1 has an opening and accommodates a battery cell pack. The top cover assembly includes a top cover plate 9, a liquid injection hole 91, a first insulating gasket 92, a second insulating gasket 93, an explosion-proof valve 94, and a protective film 95.

[0074] 3. The top cover plate retaining bracket 8 has mounting holes on both sides to facilitate the passage of the electrode post. The sides are hollowed out to facilitate the electrolyte to penetrate downwards. The bottom is reinforced with ribs to enhance the overall structure.

[0075] 4. The first connecting piece 4 and the second connecting piece 5 mentioned above; include a first electrode post 41 and a second electrode post 51. The top of the second connecting piece 5 is provided with an opening 52 to facilitate the penetration of electrolyte.

[0076] 5. Assemble the above structure as follows: first connecting piece 4, second connecting piece 5, first sealing ring 6, second sealing ring 7, upper cover plate retaining bracket 8, upper cover plate 9, first pole post insulating gasket 92, and second pole post insulating gasket 93. Figure 4 Assemble in sequence.

[0077] 6. The assembled structure is then assembled and welded to battery cell 2.

[0078] 7. After assembly and welding, use a transparent insulating film 100 for encapsulation.

[0079] 8. The encapsulated overall structure is then placed into the housing, and the aluminum housing 1 is laser-welded to the top cover plate 9 for sealing.

[0080] 9. Assembly complete.

[0081] Existing technologies involve numerous structural components, resulting in cumbersome assembly and wasted space. This invention makes the following substantial improvements to the top cover:

[0082] 1. The connecting piece is made into a boss, the top cover plate is made into a through hole, and the pole post is integrated as one piece.

[0083] 2. The traditional top cover design has been optimized, retaining only the insulating pad, top cover, retaining bracket, and sealing gasket. The seal is achieved through structural cooperation, which optimizes the waste of top space and improves the utilization rate of the battery's internal space.

[0084] The structure and technical effects of this utility model also include the following:

[0085] 1. This utility model includes an upper insulating pad, a top cover, a retaining bracket, a sealing gasket, a connecting piece, and an elastic insulating component.

[0086] 2. A boss structure is designed at the junction of the connecting piece and the top cover to insert into the inside of the cover plate terminal post. The terminal post hole in the cover plate is a through hole. The one-piece terminal post can effectively reduce the waste of structural space and reduce the internal resistance of the battery.

[0087] A sealing gasket is designed between the connecting plate boss and the retaining bracket. The sealing gasket has an upper-embedded structure, which ensures the sealing effect while making full use of the hollow space under the retaining bracket.

[0088] 4. The insulating gasket above the cover plate adopts an embedded design, which not only ensures insulation but also improves the battery's sealing performance.

[0089] Although embodiments of the present invention have been shown and described above, it is understood that these embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention. Those skilled in the art to which this invention pertains should understand that the specific structures and processes shown in the above detailed description are merely exemplary and not restrictive. Furthermore, those skilled in the art to which this invention pertains can combine the various technical features shown above in various possible ways to constitute new technical solutions or make other modifications, all of which fall within the scope of the present invention.

Claims

1. A full tab cell top cover structure, characterized in that, The application relates to a battery, which comprises the following parts: a core package, which is provided with positive and negative tabs on opposite short sides; two connecting pieces, each of which comprises a first part and a second part which are integrally connected with each other, the first part and the second part are at an angle of 90 degrees, the first part extends outwardly and is provided with a boss which is insulated and attached to the longer part of the core package, and the second part is connected with the positive and negative tabs respectively; an aluminum shell, which is wrapped outside the core package and is opened on the longer side of the core package, and is insulated and attached to the shorter sides of the core package; an upper cover, which is buckled to the opening of the aluminum shell, and is provided with two through holes, the two connecting pieces are clamped between the upper cover and the core package, and the bosses on the two connecting pieces pass through the through holes.

2. The full tab cell top cover structure of claim 1, wherein: The positive and negative tabs are full tabs.

3. The full-ledge cell top cover structure of claim 2, wherein: The connecting pieces are provided with slots, the positive and negative tabs pass through the slots and are welded to the connecting pieces.

4. The full-ledge cell top cover structure of claim 1, wherein: The inner side of the upper cover is provided with a retaining bracket which is located between the upper cover and the connecting pieces.

5. The full-ledge cell top cover structure of claim 4, wherein: An elastic insulating piece is arranged between the first part and the core package.

6. The full tab cell top cover structure of claim 1, wherein: An insulating gasket is arranged between the boss and the through hole, the boss is a pole column, and a pole column insulating piece is attached to the outer surface of the boss.

7. The full-ledge cell top cover structure of claim 6, wherein: An explosion-proof valve is arranged between the two through holes.

8. The full-ledge cell top cover structure of claim 7, wherein: A protective film is attached to the explosion-proof valve.

9. The full-ledge cell top cover structure of claim 1, wherein: The upper cover is provided with a liquid injection hole.

10. The full-ledge cell top cover structure of claim 1, wherein: A transparent insulating film is wrapped outside the core package.

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