Four-stacked-core battery core structure and battery

Abstract

The utility model provides a battery core structure with four stacked cores and a battery, the battery core structure comprises a shell, a cover plate, a roll core, a positive pole post, a negative pole post, a tab and an insulating sheet, a hollow pole post is arranged at the position of a through hole of the cover plate, a welding surface is arranged at a preset position of the hollow pole post, and the welding surface is attached to and fixedly welded with a folded part of the tab. According to the utility model, through the arrangement of the hollow-out pole columns at the through holes, the arrangement of the welding surfaces and the connection mode of the tabs, the structural form is simplified while the four roll cores are ensured to be synchronously welded, so that the cover plate does not need to be provided with a lower plastic part and an adapter sheet, and the distance between the cover plate and the roll cores is only the thickness of an insulating sheet; the thickness of the cover plate is mainly equal to the height of the hollow pole, and the cover plate can be made to be very thin and can also meet the welding assembly requirement of the pole lug, so that the structural thickness of the top of the roll core is not obviously increased when a plurality of roll cores are connected, the arrangement volume of the battery is optimized, and the energy density of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a four-stack core battery structure and a battery. Background Art

[0002] As the price of raw materials for lithium batteries continues to decline, the application of lithium batteries is becoming more and more common. In terms of application, lithium batteries are mainly divided into power batteries and energy storage batteries. The main improvement direction at present is to increase the energy density per unit battery volume, the energy density per unit battery mass, etc., especially for power batteries, which require more power to be accommodated in a limited space in order to have more advantages in the market. Based on this, batteries with a quad-stack battery structure can further optimize the battery volume layout and improve the energy density compared to a two-stack battery structure. However, the layout of the tabs, adapters, etc. under the cover of the quad-stack battery structure is more complicated than that of the two-stack battery structure, which may increase the installation height of the cover, that is, increase the layout volume, so it needs further optimization. Utility Model Content

[0003] The purpose of the utility model is to provide an improved four-stack battery structure and battery in view of the deficiencies in the above-mentioned background technology, mainly to optimize the structure and arrangement of the pole ears at the cover position, so as to reduce the arrangement volume and improve the battery energy density.

[0004] In order to achieve the above-mentioned object, the utility model provides a four-stack core battery structure, including a shell, a cover plate, a winding core, a positive pole, a negative pole, a pole ear, and an insulating sheet;

[0005] The winding core is arranged in a cavity surrounded by the cover plate and the shell, at least four winding cores are arranged, and the winding cores are arranged side by side;

[0006] The insulating sheet is located below the cover plate and connected to the cover plate, the cover plate and the insulating sheet are provided with through holes, the positive electrode column and the negative electrode column are arranged on the upper part of the corresponding through holes, the pole lug includes a horizontal part and a retracted part, the horizontal part is horizontally distributed and forms a stable connection with the corresponding winding core, and the retracted part is vertically or tilted at a small angle and connected to the positive electrode column or the negative electrode column on the through hole;

[0007] A hollow pole is also provided at the through hole position of the cover plate, and a welding surface is provided at a preset position of the hollow pole, and the welding surface is attached to the pole ear and fixed by welding.

[0008] Furthermore, the hollow pole is arranged around the edge of the through hole, the welding surface is arranged in the through hole and protrudes from the inner wall of the hollow pole, and the gathered part of the pole ear is inclined at a small angle.

[0009] Furthermore, the gathered portion of the pole tab is fixed to the welding surface by laser welding.

[0010] Furthermore, the number of the winding cores is four.

[0011] Further, the through hole is configured to be T-shaped, including a first region and a second region, the shape of the hollow pole is consistent with the through hole, two pole lugs are arranged in the first region, and two pole lugs are arranged in the second region.

[0012] Furthermore, the spacing between the two pole tabs in the first region is greater than the spacing between the two pole tabs in the second region, so that in the first region, the two pole tabs can be connected to the two winding cores of the outer layer, and in the second region, the two pole tabs can be connected to the two winding cores of the inner layer.

[0013] Furthermore, the positive electrode column or the negative electrode column is configured to be T-shaped.

[0014] The utility model also provides a battery, which adopts the above-mentioned four-stack battery structure.

[0015] The above solution of the utility model has the following beneficial effects:

[0016] The four-stacked-core battery structure and battery provided by the utility model simplify the structural form while ensuring the synchronous welding of four winding cores by hollowing out the poles at the through-hole positions, setting the welding surface and the connection method of the pole ears, so that the cover plate does not need to be provided with a lower plastic part, and the spacing between the cover plate and the winding core is only the thickness of the insulating sheet, and the thickness above the cover plate is mainly the height of the hollow pole, which can be made very thin and can also meet the welding and assembly requirements of the pole ears. Therefore, when connecting multiple winding cores, the structural thickness of the top of the winding core is not significantly increased, thereby optimizing the battery layout volume and improving the energy density of the battery;

[0017] Other beneficial effects of the present invention will be described in detail in the subsequent specific implementation sections. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 It is an exploded schematic diagram of the overall structure of the utility model;

[0020] Figure 3 It is a top view of the overall structure of the utility model;

[0021] Figure 4 for Figure 3 AA section view;

[0022] Figure 5 for Figure 3 BB cross-sectional view.

[0023] [Description of Reference Numerals]

[0024] 1-shell; 2-cover plate; 3-winding core; 4-positive pole; 5-negative pole; 6-ear; 7-insulating sheet; 8-hollow pole; 9-welding surface; 10-first area; 11-second area. DETAILED DESCRIPTION

[0025] In order to make the technical problems, technical solutions and advantages to be solved by the utility model clearer, the following will be described in detail with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model. In addition, the technical features involved in the different embodiments of the utility model described below can be combined with each other as long as they do not conflict with each other.

[0026] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a locking 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 it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] like Figure 1-Figure 5 As shown, the embodiment of the utility model provides a four-layer battery structure, including a shell 1, a cover plate 2, and a winding core 3 arranged in a battery cavity surrounded by the shell 1 and the cover plate 2. The winding core 3 adopts a four-layer method, that is, the four winding cores 3 are arranged side by side. Compared with the two-winding core 3 battery structure, the advantages have been mentioned in the background technology and will not be repeated here.

[0029] At the same time, the four-stack battery structure also includes a positive electrode column 4, a negative electrode column 5, a pole ear 6, an insulating sheet 7, etc. Among them, the insulating sheet 7 is located below the cover plate 2 and is integrally arranged with the cover plate 2. In a specific implementation of this embodiment, the insulating sheet 7 can be composed of an insulating film and a bottom support plate. By setting the insulating sheet 7, the surface of the cover plate 2 is kept insulated and leak-proof.

[0030] Among them, through holes are provided on the cover plate 2 and the insulating sheet 7. When the pole lug 6 is connected to the winding core 3, the pole lug 6 passes through the corresponding through hole and is connected to the positive electrode column 4 or the negative electrode column 5. As a major improvement, in this embodiment, the pole lug 6 includes a horizontal portion and a retracted portion, and is in a ⊥ shape as a whole. The horizontal portion is horizontally distributed to form a stable connection with the corresponding winding core 3, and the retracted portion is vertically or tilted at a small angle to be able to connect with the positive electrode column 4 or the negative electrode column 5 on the through hole.

[0031] In order to further reduce the thickness between the cover plate 2 and the winding core 3, and to make the welding operation of the pole lug 6 more convenient and the fixation more firm, a hollow pole 8 is further provided at the position of the through hole in this embodiment, and a welding surface 9 is provided at a preset position of the hollow pole 8, and the welding surface 9 is used to fit and weld with the folded part of the pole lug 6, so that the pole lug 6 is fixed at the position of the through hole. Among them, the hollow pole 8 is arranged around the edge of the through hole, and the welding surface 9 is arranged to protrude from the inner wall of the hollow pole 8 into the through hole. The folded part of the pole lug 6 adopts a small angle inclined distribution scheme to achieve a close fit with the welding surface 9, and then the laser welding process is used to complete the welding.

[0032] It is understandable that the hollow pole 8, welding surface 9, etc. are preferably made of insulating materials to avoid leakage at other positions of the cover plate 2. Only the positive pole 4 and negative pole 5 installed at the through hole lead the electric energy outward.

[0033] As a preferred embodiment, the through-hole shape in this embodiment is set to be T-shaped, including a first area 10 (T-shaped top) and a second area 11 (T-shaped bottom), and the shape of the hollow pole 8 is also consistent. For a certain through-hole, there are four pole ears 6 in its area connected to four winding cores 3. Therefore, in this embodiment, two pole ears 6 are arranged in the first area 10, and two pole ears 6 are arranged in the second area 11, which are respectively connected to the corresponding winding cores 3, and finally the four pole ears 6 at the through-hole position are connected through the positive pole column 4 or the negative pole column 5, thereby completing the connection of the four winding cores 3.

[0034] It should be noted that in the first area 10, the distance between the two pole ears 6 is relatively far, so that they can be connected to the two winding cores 3 of the outer layer, and at the same time they will not contact the two winding cores 3 of the inner layer. In the second area 11, the distance between the two pole ears 6 is relatively close, so that they can be connected to the two winding cores 3 of the inner layer, and at the same time they will not contact the two winding cores 3 of the outer layer. This method will not cause the pole ears 6 to interfere with each other. Of course, the first area 10 and the second area 11 shown in the figure are an optional implementation, and the T-shape can also be rotated 180 degrees on the cover plate 2 to meet the connection of the four winding cores 3.

[0035] It is worth mentioning that, based on the aforementioned arrangement of the hollow pole 8 and the welding surface 9, the horizontal portion of the pole lug 6 needs to pass through the bottom of the hollow pole 8. Therefore, in this embodiment, the through hole is slightly protruding from the hollow pole 8 at the corresponding position, so that the horizontal portion of the pole lug 6 can pass through the hollow pole 8 from below, and fit with the bottom of the hollow pole 8 after welding, and is further pressed by the hollow pole 8 to ensure stability.

[0036] In this embodiment, the positive pole 4 or the negative pole 5 is also correspondingly set in a T-shape to cover the position of the through hole in a matching manner. Under the premise of ensuring welding with the four pole ears 6, the through hole can be filled and partially immersed in the through hole. As described above, the cover plate 2 of the four-stack core battery structure provided in this embodiment does not have a lower plastic part, and the distance between the cover plate 2 and the winding core 3 is only the thickness of the insulating sheet 7. The thickness above the cover plate 2 is mainly the height of the hollow pole 8, which can be made very thin and can also meet the welding and assembly requirements of the pole ears 6. The positive pole 4 or the negative pole 5 can also be partially immersed in the through hole. Therefore, when connecting multiple winding cores 3, the structural thickness of the top of the winding core 3 is not significantly increased, thereby optimizing the battery layout volume and improving the energy density of the battery.

[0037] It should be noted that the solution provided in this embodiment is not limited to the four-stack core battery cell structure. For six-stack core, eight-stack core and other forms, a third area and a fourth area with a larger width can also be set, and they can be distributed in sequence with the first area 10 and the second area 11 according to the numbers, and the shapes of the hollow pole 8, the positive pole 4, and the auxiliary pole 5 can be set correspondingly.

[0038] Based on the same concept, this embodiment also provides a battery, which adopts the aforementioned four-stack battery cell structure to optimize the battery layout volume and improve the battery energy density. The beneficial effects achieved are similar to those mentioned above and will not be repeated here.

[0039] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A four-stack battery cell structure, characterized in that: Including shell, cover, winding core, positive pole, negative pole, pole ear and insulating sheet; The winding core is arranged in a cavity surrounded by the cover plate and the shell, at least four winding cores are arranged, and the winding cores are arranged side by side; The insulating sheet is located below the cover plate and connected to the cover plate, the cover plate and the insulating sheet are provided with through holes, the positive electrode column and the negative electrode column are arranged on the upper part of the corresponding through holes, the pole lug includes a horizontal part and a retracted part, the horizontal part is horizontally distributed and forms a stable connection with the corresponding winding core, and the retracted part is vertically or tilted at a small angle and connected to the positive electrode column or the negative electrode column on the through hole; A hollow pole is also provided at the through hole position of the cover plate, and a welding surface is provided at a preset position of the hollow pole, and the welding surface is attached to the pole ear and fixed by welding.

2. A four-stack battery cell structure according to claim 1, characterized in that: The hollow pole is arranged around the edge of the through hole, the welding surface is arranged in the through hole and protrudes from the inner wall of the hollow pole, and the gathered part of the pole ear is inclined at a small angle.

3. A four-stack battery cell structure according to claim 1, characterized in that: The gathered portion of the pole ear is fixed to the welding surface by laser welding.

4. A four-stack battery cell structure according to claim 1, characterized in that: The number of the winding cores is four.

5. A four-stack battery cell structure according to claim 4, characterized in that: The through hole is configured to be T-shaped, including a first region and a second region. The shape of the hollow pole is consistent with that of the through hole. Two pole lugs are arranged in the first region, and two pole lugs are arranged in the second region.

6. A four-stack battery cell structure according to claim 5, characterized in that: The distance between the two pole tabs in the first region is greater than the distance between the two pole tabs in the second region, so that in the first region, the two pole tabs can be connected to the two winding cores of the outer layer, and in the second region, the two pole tabs can be connected to the two winding cores of the inner layer.

7. A four-stack battery cell structure according to claim 5, characterized in that: The positive electrode column or the negative electrode column is configured in a T shape.

8. A battery, characterized in that: A four-stack battery cell structure as described in any one of claims 1 to 7 is adopted.

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