Battery roll core structure with infiltrating member and roll core battery

Abstract

The utility model discloses a kind of battery roll core structure and roll core battery with infiltrating member, battery roll core structure with infiltrating member includes: at least one roll core, the roll core includes two pole pieces, and through-hole is respectively provided at the R angle of roll core two sides perpendicular to roll core end face;Infiltrating member, the infiltrating member includes backing plate and is arranged at the at least one pair of infiltrating stick of the same side of the backing plate, each pair of the infiltrating stick is respectively arranged in the through-hole of the R angle of same roll core two sides, and backing plate is arranged at the one side end face of roll core.The utility model of a kind of battery roll core structure with infiltrating member, R angle infiltration can be improved, directly embedded into roll core R angle through-hole by infiltrating stick, electrolyte can reach directly infiltrating blind area, effectively solve the problem of R angle lithium analysis in the prior art;While without increasing the thickness of roll core itself, the infiltrating member of external does not change pole piece ontology structure, avoids roll core over-thickness risk.

Description

Technical Field

[0001] This utility model relates to the field of wound battery technology, and in particular to a battery wound structure with an impregnation element and a wound battery. Background Technology

[0002] A common technical challenge in the current energy storage battery field is insufficient electrolyte wetting at the radius (R) corner of the core. One existing solution involves adding protrusions to the surfaces of the positive and negative electrodes to increase the interlayer gap. However, this structure has three inherent defects: Excessive thickness: The protrusions cause the overall core thickness to exceed the standard, severely limiting the improvement of battery energy density; Interface failure: The protruding structure prolongs the lithium-ion transport path, leading to lithium deposition on the negative electrode surface; Radius blind zone: Due to geometric stress concentration at the radius (R) corner, the actual gap between the electrode and the separator is smaller than in the central area, preventing effective electrolyte penetration.

[0003] The aforementioned defects can lead to a significant drop in battery capacity after cycling, and cannot be completely eliminated through existing structural optimizations. Therefore, there is an urgent need to develop a core-spinning construction scheme that does not alter the intrinsic structure of the electrode sheets but precisely improves the wetting capability of the radius (R-angle). Utility Model Content

[0004] To address the problems of poor electrolyte wetting at the R-corner of the battery core in existing technologies, which easily leads to lithium plating at the R-corner and cycling failure during the cycle process, this invention proposes a battery core structure with a wetting element.

[0005] The specific technical solution is as follows:

[0006] A battery core structure with a wetting element, comprising:

[0007] At least one core, the core including two pole pieces, and through holes perpendicular to the end face of the core are respectively provided at the R-corners on both sides of the core;

[0008] The wetting element includes a support plate and at least one pair of wetting rods disposed on the same side of the support plate. Each pair of wetting rods is disposed in the through holes at the radius (R) corners of the same winding core. The support plate is disposed on one end face of the winding core. This structure can improve the wetting of the R-corner. By directly embedding the wetting rods into the through holes at the R-corner of the winding core, the electrolyte can directly reach the wetting blind zone, effectively solving the problem of lithium plating at the R-corner in the prior art. At the same time, it does not increase the thickness of the winding core itself. The external wetting element does not change the electrode body structure, avoiding the risk of excessively thick winding cores. The support plate is fixed to the end face of the winding core and does not interfere with the internal electrode interface.

[0009] Furthermore, the winding core is a single unit, and the impregnation element includes a pair of impregnation rods. A single winding core is adapted to a single pair of impregnation rods, which can meet the needs of small batteries and reduce production costs; each impregnation element is independently replaceable, extending the cell's lifespan.

[0010] Furthermore, the battery core consists of two cores, which are bonded together along the thickness direction. The impregnation element includes two pairs of impregnation rods that mate with the through holes of the two cores. With the battery core structure configured on a large scale, when the two cores are bonded together, the two pairs of impregnation rods simultaneously address multiple R-angle impregnation issues; the support plate simultaneously fixes the end faces of the two cores, improving the overall structure's resistance to expansion.

[0011] Furthermore, the wetting rod is made of ceramic alumina or oleophilic polypropylene. The wetting element has saturated liquid absorption capacity, ensuring that the electrode at the R-angle is always fully wetted during battery cycling. Ceramic alumina has strong resistance to electrolyte corrosion, ensuring long-term cycle stability; oleophilic polypropylene has a fast liquid absorption rate, shortening the wetting time after liquid injection.

[0012] Furthermore, the through hole is a cylindrical through hole. The through hole is created by inserting an alloy pillar into the core before winding, and then removing the alloy pillar after core shaping. Cylindrical holes are easy to standardize and produce, reducing manufacturing costs, and the thickness around the cylindrical hole is more uniform; the cylindrical surface is in full circumference contact with the impregnation bar, which can reduce electrolyte leakage.

[0013] Furthermore, the tray is made of polyethylene or polypropylene. Polyethylene / polypropylene has high insulation and resistance to electrolyte swelling, which can eliminate the risk of short circuits, and its low polymer density can reduce the overall weight of the battery.

[0014] Furthermore, the thickness of the tray is 0.5-2mm.

[0015] A wound battery includes: a battery wound structure with a wetting element and a battery casing, wherein the battery wound structure with the wetting element is disposed within the battery casing. The wound structure with the wetting element is directly compatible with standard battery casings without requiring production line modifications, and structures with different numbers of wound cores can be fitted with battery casings of different sizes.

[0016] Furthermore, the battery casing is made of aluminum. The aluminum casing provides synergistic heat dissipation; its high thermal conductivity, combined with the liquid cooling effect of the immersion element, helps to suppress localized overheating of the battery.

[0017] The above technical solution has the following advantages or technical effects:

[0018] 1. This utility model has a structural design that precisely embeds the wetting rod into the R-corner through holes on both sides of the core, so that the electrolyte can directly reach the traditional wetting blind area, ensuring that the R-corner electrode receives a continuous supply of electrolyte during the cycle, and fundamentally eliminating the problems of lithium plating and capacity drop caused by insufficient local wetting.

[0019] 2. This utility model adopts an external impregnation component solution, which does not require any structural modification of the electrode body. The core thickness is completely consistent with that before modification, thus avoiding the decrease in energy density caused by structural thickening.

[0020] 3. The modular design of the impregnation part and the core allows for flexible matching of cores of different heights; the cylindrical through hole and standardized impregnation bar enable quick insertion and assembly, significantly shortening the impregnation waiting time after liquid injection; at the same time, the rigid fixation of the impregnation bar by the support plate eliminates the risk of displacement caused by vibration and ensures the stability of batch products. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the battery core structure with immersion element of this utility model;

[0022] Figure 2 This is a schematic diagram of the core structure in the battery core structure with immersion element of this utility model;

[0023] Figure 3 This is a top view of the core in the battery core structure with immersion element of this utility model;

[0024] Figure 4 This is a bottom view of the core in the battery core structure with immersion element of this utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the immersion element in the battery core structure with immersion element of this utility model;

[0026] Figure 6 This is a schematic diagram of the structure of the wound-cell battery of this utility model.

[0027] The attached diagram is labeled as follows: 1-core, 1.1-electrode, 1.2-through hole, 2-impregnated part, 2.1-support plate, 2.2-impregnated rod, 3-battery casing. Detailed Implementation

[0028] To make the technical solution of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Example 1

[0030] like Figure 1 As shown, a battery core structure with a wetting element includes:

[0031] like Figure 2 The shown core 1 includes two electrode pieces 1.1, each comprising a positive electrode piece and a negative electrode piece. One side of each electrode piece 1.1 extends beyond the end face of the core 1, as shown below. Figure 3As shown, positive and negative electrodes are formed, and through holes 1.2 perpendicular to the end face of the winding core 1 are respectively provided at the R-corners on both sides of the winding core 1. Figure 3 , Figure 4 As shown;

[0032] like Figure 5 As shown, the impregnation element 2 includes a support plate 2.1 and a pair of impregnation rods 2.2 disposed on the same side of the support plate 2.1. The pair of impregnation rods 2.2 are respectively disposed in the through holes 1.2 at the R-corners on both sides of the core 1. The support plate 2.1 is disposed on the flat end face of the core 1.

[0033] The wetting rod 2.2 can be made of ceramic alumina or oleophilic polypropylene, or it can be made of rigid sponge. The wetting element 2.2 has saturated liquid absorption capacity, ensuring that the electrode 1.1 at the R-angle is always fully wetted during battery cycling.

[0034] Through hole 1.2 is a cylindrical through hole. Through hole 1.2 is produced by inserting an alloy pillar into the core 1 before winding, and then removing the alloy pillar after the core 1 is shaped. Cylindrical through holes are easy to standardize and produce, reducing manufacturing costs, and the thickness around the cylindrical hole is more uniform; the cylindrical surface is in full circumference contact with the impregnation bar, which can reduce electrolyte leakage.

[0035] The material of pallet 2.1 can be polyethylene or polypropylene, etc., and the thickness of pallet 2.1 is 0.5-2mm.

[0036] Example 2

[0037] A battery core structure with a wetting element, comprising:

[0038] At least two cores 1 are attached along the thickness direction. Each core 1 includes two electrode plates 1.1. The two electrode plates 1.1 include a positive electrode plate and a negative electrode plate. One side of the electrode plate 1.1 extends beyond the end face of the core 1 to form a positive and a negative electrode. Each core 1 has a through hole 1.2 perpendicular to the end face of the core 1 at the R-corner on both sides.

[0039] The impregnation element 2 includes a support plate 2.1 and at least one pair of impregnation rods 2.2 disposed on the same side of the support plate 2.1. Each pair of impregnation rods 2.2 is disposed in the through holes 1.2 at the R-corners on both sides of the same core 1. The support plate 2.1 is disposed on the flat end face of the core 1.

[0040] Taking two cores 1 as an example, the two cores 1 are attached together along the thickness direction. The impregnation element 2 includes two pairs of impregnation rods 2.2 that are matched with the through holes 1.2 of the two cores 1.

[0041] The material of the wetting rod 2.2 can be ceramic alumina, etc. The wetting element 2.2 has saturated liquid absorption capacity, so that the electrode 1.1 at the R corner is always fully wetted during the battery cycle.

[0042] Through hole 1.2 is a cylindrical through hole. Through hole 1.2 is produced by inserting an alloy pillar into the core 1 before winding, and then removing the alloy pillar after the core 1 is shaped. Cylindrical through holes are easy to standardize and produce, reducing manufacturing costs, and the thickness around the cylindrical hole is more uniform; the cylindrical surface is in full circumference contact with the impregnation bar, which can reduce electrolyte leakage.

[0043] The material of pallet 2.1 can be polyethylene, etc., and the thickness of pallet 2.1 is 1mm.

[0044] Example 3

[0045] like Figure 6 As shown, a wound battery includes: a battery wound structure with a wetting element as highlighted in Embodiments 1 and 2, and a battery casing 3, wherein the battery wound structure with a wetting element is disposed inside the battery casing 3.

[0046] The battery casing 3 can be an aluminum casing.

[0047] The core 1 is made by winding the positive electrode sheet, negative electrode sheet, upper separator, and lower separator around the winding needle after die-cutting the positive and negative electrode sheets, and the upper and lower separators to obtain the normal core 1. When the core 1 is wound and unloaded, an alloy cylinder with a certain diameter is inserted on each side of the core 1. Then, the core 1 is shaped by pre-pressing, preheating, hot pressing, and gluing. The two alloy cylinders reserved at the R-corners on both sides of the shaped core 1 are pulled out. Two through holes 1.2 are reserved at the R-corners on both sides of the completed core 1. The impregnation rods 2.2 are respectively embedded in the through holes 1.2 to form a single core. The core 1 and the impregnation part 2 are combined to form a fixed core assembly unit. The fixed core assembly unit can be spliced ​​and arranged in any number. The number and / or size of the support plates 2.1 are adjusted accordingly. After forming a battery pack of a certain thickness, it is inserted into the battery shell 3 to complete the assembly into the shell.

[0048] After the assembled battery cells are activated by electrolyte injection, they can be disassembled with fresh, fully charged cells, cycled at room temperature, and then disassembled after cycling at room temperature before they can work normally.

[0049] This invention adds wetting elements to the two radius corners of a single wound core, ensuring that even electrode sheets with poorly wetted radius corners have liquid absorption channels. Compared to other electrode sheet treatment methods, this invention achieves comprehensive wetting of the entire wound core by simply adding a wetting element to a single wound core, greatly releasing and improving the performance of the cell. Furthermore, this solution also solves the problem of poor wetting of wound cores due to increased cell height in wound core processes. It is easy to operate, can be mass-produced, and greatly ensures the optimal performance of the cell.

[0050] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A jelly-roll structure of a battery cell with a wick, characterized by, include: At least one core (1), the core (1) includes two pole pieces (1.1), and through holes (1.2) perpendicular to the end face of the core (1) are provided at the R-corners on both sides of the core (1). The impregnation member (2) includes a tray (2.1) and at least one pair of impregnation rods (2.2) disposed on the same side of the tray (2.1). Each pair of impregnation rods (2.2) is disposed in the through hole (1.2) at the R-corner on both sides of the same core (1). The tray (2.1) is disposed on one end face of the core (1).

2. The jelly-roll battery core structure according to claim 1, wherein The core (1) is one, and the impregnating element (2) includes a pair of impregnating rods (2.2).

3. The battery jelly-roll structure with a wick according to claim 1, wherein, The core (1) consists of two cores, which are attached together along the thickness direction. The impregnating element (2) includes two pairs of impregnating rods (2.2) that are positioned to cooperate with the through holes (1.2) of the two cores (1).

4. The battery roll core structure with an infiltrated member according to any one of claims 1 to 3, characterized by, The impregnation rod (2.2) is made of ceramic alumina or oleophilic polypropylene.

5. The battery roll core structure with an infiltrated member according to any one of claims 1 to 3, characterized by, The through hole (1.2) is a cylindrical through hole.

6. The battery roll core structure with an infiltrated member according to any one of claims 1 to 3, characterized by, The tray (2.1) is made of polyethylene or polypropylene.

7. The battery roll core structure with an infiltrated member according to any one of claims 1 to 3, characterized by, The thickness of the tray (2.1) is 0.5-2mm.

8. A jelly-roll battery, characterized by include: A battery core structure with a wetting element and a battery casing (3) according to any one of claims 1 to 7, wherein the battery core structure with a wetting element is disposed inside the battery casing (3).

9. The jelly-roll battery of claim 8, wherein, The battery casing (3) is an aluminum casing.

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