Roll core structure for giant cylindrical sodium battery

Abstract

The utility model relates to a roll core structure for a giant cylindrical sodium battery, which belongs to the field of sodium batteries and comprises a cylindrical roll core body, the roll core body is formed by winding a pole piece belt, and the pole piece belt is formed by sequentially stacking a positive pole piece, a diaphragm belt, a negative pole piece and a diaphragm belt. The end, located on the outer side of the winding core body, of each pole piece belt is adhered to the outer side surface of the winding core body through an adhesive tape, the two ends of the winding core body in the axis direction of the winding core body form a first end and a second end respectively, and at least one supporting rod is inserted into the winding core body, located between the mutually wound pole piece belts and parallel to the axis of the winding core body; one end of the supporting rod is located on the inner side of the roll core body, and the other end of the supporting rod extends out of the roll core body through the second end of the roll core body. According to the utility model, the infiltration effect of electrolyte on the roll core body can be effectively improved, so that the effect of improving the quality of the giant cylindrical sodium battery is achieved.

Description

Technical Field

[0001] This utility model relates to the field of sodium batteries, and in particular to a core structure for giant cylindrical sodium batteries. Background Technology

[0002] Sodium batteries, also known as sodium-ion batteries, are a type of rechargeable battery that primarily functions by the movement of sodium ions between the positive and negative electrodes. Traditional cylindrical sodium batteries typically range in diameter from 120mm to 200mm and in length from 300mm to 1200mm. Currently, to reduce the number of connectors in the battery pack, decrease the complexity of the battery pack's BMS (Battery Management System), and thus lower the cost, giant cylindrical sodium batteries, several times the size of traditional batteries, have emerged.

[0003] However, the larger size of cylindrical sodium batteries means that their positive and negative electrodes are larger and heavier. Therefore, during the winding process of the core, it is easy to encounter a situation where the winding tension is too high, which will make the core wound more tightly. The more tightly wound core will result in too small a gap between the electrode and the separator. At this time, the electrolyte is difficult to penetrate into the core, which will lead to battery quality problems.

[0004] Based on this, the present invention provides a core structure for a giant cylindrical sodium battery. By inserting a support rod inside the core, a hole structure is formed inside the core, thereby increasing the porosity of the core and improving the wetting effect of the electrolyte, thus improving the quality of the giant cylindrical sodium battery. Utility Model Content

[0005] Based on this, it is necessary to provide a core structure for a giant cylindrical sodium battery, comprising a cylindrical core body, the core body being formed by winding electrode strips, the electrode strips being formed by sequentially stacking a positive electrode strip, a separator strip, a negative electrode strip, and a separator strip, one end of the electrode strip located on the outside of the core body being adhered to the outer surface of the core body by adhesive tape, the core body having a first end and a second end respectively formed at both ends along its axial direction, at least one support rod inserted into the core body, the support rod being located between the mutually wound electrode strips, the support rod being arranged parallel to the axis of the core body, and one end of the support rod being located inside the core body, the other end extending out of the core body via the second end of the core body.

[0006] In this invention, at least one support rod is inserted into the inner side of the core body. The support rod is located between the interlocking electrode strips. Therefore, the presence of the support rod causes the interlocking electrode strips to open, forming a hole structure between them. When electrolyte is injected, the electrolyte can penetrate deep into the core body along this hole structure, effectively improving the wetting effect of the electrolyte on the core body, thereby improving the quality of the giant cylindrical sodium battery. The support rod, after being inserted into the core body, expands the core body, increasing its diameter. Therefore, in this invention, the support rod inserted into the core body is configured such that one end is located inside the core body and the other end extends to the outside of the core body. This way, the first end of the core body is not expanded, and its diameter does not increase. When the core body is inserted into the cylindrical battery casing, inserting the first end first allows the core body with the support rod inserted to be smoothly inserted into the battery casing.

[0007] In this invention, after the core body is impregnated with electrolyte, the support rod needs to be removed from the core body to prevent its presence from affecting subsequent processing. During removal, the portion of the support rod extending beyond the core body can be used as a gripping structure, facilitating its removal. It is noteworthy that after the support rod is removed, the core body, under its own elasticity, causes the hole structure formed by the support rod to gradually disappear, thereby gradually restoring the winding structure of the core body to its normal shape.

[0008] Furthermore, the support rod is cylindrical.

[0009] In this invention, the outer surface of the cylindrical support rod is relatively smooth and has no sharp edges. Therefore, during the insertion and removal of the support rod, damage to the electrode strip can be effectively avoided. Simultaneously, after the cylindrical support rod is inserted into the core body, the curvature of its outer surface results in a smaller contact area with the electrode strip. This effectively increases the capacity of the pore structure formed by the support rod within the core body for electrolyte, thereby further enhancing the wetting effect of the electrolyte within the core body.

[0010] Furthermore, the support rod is a flexible support rod.

[0011] In this invention, the support rod is flexible. Therefore, after the support rod is inserted into the core body, it can deform under the pressure of the electrode strip, which can reduce the damage to the electrode strip caused by the "hard-on-hard" contact between the support rod and the electrode strip.

[0012] Furthermore, the support rod is in the shape of a hollow circular tube.

[0013] In this invention, the hollow cylindrical support rod has no internal support structure, which provides better flexibility and can further reduce damage to the electrode strip caused by the support rod.

[0014] Furthermore, one end of the support rod located inside the core body is pressed together to form a straight-line seal that seals the end of the support rod.

[0015] In this invention, the support rod is sealed at one end inside the core body and open at the other end outside the core body. Therefore, when the support rod is removed from the core body, air can be pumped out through the open end of the support rod, causing it to be flattened under negative pressure. This releases the contact structure between the support rod and the electrode strip, effectively facilitating the removal of the support rod and preventing frictional damage to the electrode strip during the removal process.

[0016] In this invention, the support rod can be made of silicone, TPE, TPU, etc., and its ends can be pressed together by hot pressing to obtain a straight sealing structure.

[0017] Furthermore, both ends of the support rod are pressed together to form a straight-line seal at the end of the support rod, and the support rod is filled with air.

[0018] In this invention, the support rod has a structure with both ends sealed and is filled with air. Therefore, the support rod can simultaneously achieve good flexibility and good support effect. At the same time, when it is necessary to remove the support rod, the air inside the support rod can be released to make the support plate deflate, thereby facilitating the removal of the support rod.

[0019] In this invention, the support rod can be made of silicone, TPE, TPU, etc., and its ends can be pressed together by hot pressing to obtain a straight sealing structure.

[0020] The principle and effects of this utility model will be further explained below with reference to the above technical solution and accompanying drawings:

[0021] In this invention, the presence of the support rod causes the wound electrode strips to be spread apart, forming a hole structure between the electrode strips. When the electrolyte is injected, the electrolyte can penetrate into the core body along the hole structure, thereby effectively improving the wetting effect of the electrolyte on the core body and thus improving the quality of the giant cylindrical sodium battery.

[0022] In addition, in this invention, the support rod inserted into the core body is configured such that one end is located inside the core body and the other end extends to the outside of the core body. In this way, the first end of the core body will not be stretched open and its diameter will not increase. At this time, when the core body is inserted into the casing of the cylindrical battery, by inserting the first end first, the core body with the support rod inserted can be smoothly inserted into the battery casing. Attached Figure Description

[0023] Figure 1 This is a top view schematic diagram of the core structure for a giant cylindrical sodium battery as described in an embodiment of the present invention;

[0024] Figure 2 This is a front view schematic diagram of the core structure for a giant cylindrical sodium battery as described in an embodiment of the present invention;

[0025] Figure 3 This is a schematic cross-sectional view of the support rod described in an embodiment of the present invention. Figure 1 ;

[0026] Figure 4 This is a schematic cross-sectional view of the support rod described in an embodiment of the present invention. Figure 2 .

[0027] Attached Figure

[0028] 1-Core body, 2-Support rod, 21-Sealing. Detailed Implementation

[0029] To facilitate understanding by those skilled in the art, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0030] like Figure 1-4 A core structure for a giant cylindrical sodium battery includes a cylindrical core body 1, which is formed by winding electrode strips. The electrode strips are formed by sequentially stacking a positive electrode strip, a separator strip, a negative electrode strip, and a separator strip. One end of the electrode strip located on the outside of the core body 1 is adhered to the outer surface of the core body 1 by adhesive tape. The core body 1 has a first end and a second end formed at its two ends along its axial direction. At least one support rod 2 is inserted into the core body 1. The support rod 2 is located between the mutually wound electrode strips. The support rod 2 is arranged parallel to the axis of the core body 1, and one end of the support rod 2 is located inside the core body 1, while the other end extends out of the core body 1 through the second end of the core body 1.

[0031] In this invention, at least one support rod 2 is inserted into the inner side of the core body 1. The support rod 2 is located between the interlocking electrode strips. Therefore, the presence of the support rod 2 will cause the interlocking electrode strips to be opened up. At this time, a hole structure will be formed between the electrode strips. When the electrolyte is injected, the electrolyte can penetrate into the core body 1 along the hole structure, thereby effectively improving the wetting effect of the electrolyte on the core body 1, thus achieving the effect of improving the quality of the giant cylindrical sodium battery. When the support rod 2 is inserted into the core body 1, it will expand the core body 1, increasing its diameter. Therefore, in this invention, the support rod 2 inserted into the core body 1 is configured such that one end is located inside the core body 1 and the other end extends to the outside of the core body 1. In this way, the first end of the core body 1 will not expand, and its diameter will not increase. At this time, when the core body 1 is inserted into the casing of the cylindrical battery, by inserting the first end first, the core body 1 with the support rod 2 inserted can be smoothly inserted into the battery casing.

[0032] In this invention, after the core body 1 is soaked in the electrolyte, the support rod 2 needs to be removed from the core body 1 to prevent its presence from affecting subsequent processing. During removal, the portion of the support rod 2 extending out of the core body 1 can be used as a gripping structure, facilitating its removal. It is noteworthy that after removing the support rod 2, the core body 1, under its own elasticity, will cause the hole structure formed by the support rod 2 to gradually disappear, thereby gradually restoring the winding structure of the core body 1 to its normal shape.

[0033] In one embodiment, the support rod 2 is cylindrical.

[0034] In this embodiment, the outer surface of the cylindrical support rod 2 is relatively smooth and has no sharp edges. Therefore, during the insertion and removal of the support rod 2, damage to the electrode strip can be effectively avoided. Simultaneously, after the cylindrical support rod 2 is inserted into the core body 1, due to the curvature of its outer surface, its contact area with the electrode strip is small. This effectively increases the capacity of the pore structure formed by the support rod 2 within the core body 1 for electrolyte, thereby further improving the wetting effect of the electrolyte within the core body 1.

[0035] In one embodiment, the support rod 2 is a flexible support rod 2.

[0036] In this embodiment, the support rod 2 is flexible. Therefore, after the support rod 2 is inserted into the core body 1, the support rod 2 can deform under the pressure of the electrode strip, which can reduce the damage to the electrode strip caused by the "hard-on-hard" contact between the support rod 2 and the electrode strip.

[0037] In one embodiment, the support rod 2 is in the shape of a hollow circular tube.

[0038] In this embodiment, the hollow cylindrical support rod 2 has no internal support structure, which provides better flexibility and can further reduce the damage to the electrode strip caused by the support rod 2.

[0039] In one embodiment, one end of the support rod 2 located inside the core body 1 is pressed together to form a straight-line seal 21 that seals the end of the support rod 2.

[0040] In this embodiment, the support rod 2 is sealed at one end inside the core body 1 and open at the other end outside the core body 1. Therefore, when the support rod is removed from the core body 1, the support rod 2 can be evacuated through the open end, causing it to be flattened under negative pressure. This releases the contact structure between the support rod 2 and the electrode strip, effectively facilitating the removal of the support rod 2. This also helps prevent friction damage to the electrode strip during the removal of the support rod 2 from the core body 1.

[0041] In terms of strength, the support rod 2 can be made of silicone, TPE, TPU, etc., and its ends can be pressed together by hot pressing to obtain a straight sealing structure.

[0042] In one embodiment, both ends of the support rod 2 are pressed together to form a straight-line seal 21 that seals the ends of the support rod 2, and the support rod 2 is filled with air.

[0043] In this embodiment, the support rod 2 has a structure with both ends sealed 21 and is filled with air. Therefore, the support rod 2 can simultaneously achieve good flexibility and good support effect. At the same time, when it is necessary to remove the support rod 2, the support plate can be deflated by releasing the air inside the support rod 2, which makes it easy to remove the support rod 2.

[0044] In this embodiment, the support rod 2 can be made of silicone, TPE, TPU, etc., and its end can be pressed together by hot pressing to obtain a straight sealing structure.

[0045] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the 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 core structure for a giant cylindrical sodium battery, comprising a cylindrical core body, the core body being formed by winding electrode strips, the electrode strips being formed by sequentially stacking a positive electrode strip, a separator strip, a negative electrode strip, and a separator strip, wherein one end of the electrode strip located on the outer side of the core body is adhered to the outer surface of the core body by adhesive tape, characterized in that, The core body has a first end and a second end formed at both ends along its axial direction. At least one support rod is inserted into the core body. The support rod is located between the mutually wound electrode strips. The support rod is arranged parallel to the axis of the core body. One end of the support rod is located inside the core body, and the other end extends out of the core body through the second end of the core body.

2. The core structure for a giant cylindrical sodium battery according to claim 1, characterized in that, The support rod is cylindrical.

3. The core structure for a giant cylindrical sodium battery according to claim 1, characterized in that, The support rod is a flexible support rod.

4. The core structure for a giant cylindrical sodium battery according to claim 3, characterized in that, The support rod is in the shape of a hollow cylindrical tube.

5. The core structure for a giant cylindrical sodium battery according to claim 4, characterized in that, One end of the support rod located inside the core body is pressed together to form a straight-line seal that seals the end of the support rod.

6. The core structure for a giant cylindrical sodium battery according to claim 4, characterized in that, Both ends of the support rod are pressed together to form a straight-line seal at the end of the support rod, and the support rod is filled with air.

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