Cylindrical lithium ion battery with core tube wrapped by expansion adhesive tape

Abstract

The cylindrical lithium ion battery comprises a battery cell, the battery cell comprises a battery cell negative plate and a battery cell positive electrode, an aluminum shell is arranged below the battery cell positive electrode, the battery cell positive electrode is connected with the aluminum shell through a positive electrode connecting piece, a core tube body is arranged at the top of the battery cell negative plate, the expansion adhesive tape is arranged on one side of the core tube body, and the expansion adhesive tape is arranged on the other side of the core tube body. A light cover plate is also arranged above the battery cell negative plate; the utility model has the advantages of reasonable structure, good support effect, effective alleviation of core collapse, and prolonged cycle life.

Description

Technical Field

[0001] The utility model belongs to the technical field of cylindrical batteries, and in particular relates to a cylindrical lithium ion battery with a core tube wrapped with an expansion tape. Background Art

[0002] Cylindrical batteries are widely accepted because of their simple and easy processing characteristics. However, cylindrical batteries also have disadvantages due to their winding structure. That is, as the cycle progresses, the center collapses, resulting in poor contact at the battery cell interface, which ultimately affects the battery cycle life. The current methods to solve this problem are as follows: First, a stainless steel tube or a PPS+GF tube is inserted in the middle as a core tube. After this method is inserted, there is still a large gap, which cannot solve the support problem well; Second, the core tube is used as a support. During winding, the diaphragm and the core tube are hot-melted and then wound with the electrode to achieve the purpose of support. However, this solution does not reserve space for stress release after the battery cell is wound and electrode expansion during baking, resulting in excessive stress in the battery cell core, difficulty in wetting, affecting the cycle, and low efficiency of hot melting, which seriously affects production efficiency. Therefore, it is very necessary to provide a cylindrical lithium-ion battery with a core tube wrapped with an expansion tape that has a reasonable structure, good support effect, effective relief of core collapse, and extended cycle life. Summary of the invention

[0003] The utility model aims to overcome the deficiencies of the prior art and to provide a cylindrical lithium-ion battery with an expansion tape wrapped core tube, which has a reasonable structure, good supporting effect, effectively alleviates core collapse, and prolongs cycle life.

[0004] The purpose of the utility model is achieved as follows: a cylindrical lithium-ion battery with a core tube wrapped with an expansion tape, which includes a battery cell, the battery cell includes a battery cell negative plate and a battery cell positive electrode, an aluminum shell is arranged below the battery cell positive electrode, the battery cell positive electrode is connected to the aluminum shell through a positive electrode connecting sheet, a core tube body is arranged on the top of the battery cell negative plate, an expansion tape is arranged on one side of the core tube body, and a light cover plate is also arranged above the battery cell negative plate.

[0005] The top surface of the light cover plate is provided with insulating plastic, a pole is provided inside the insulating plastic, and an upper aluminum block is provided outside the connection between the upper surface of the insulating plastic and the pole.

[0006] The core tube body is a common core tube without an expansion layer, and the common core tube base material is one of stainless steel or PPS+GF.

[0007] The core tube body is an expansion core tube, and the expansion core tube comprises a common core tube and an expansion tape wrapped around the outside of the common core tube.

[0008] The expansion tape comprises a substrate layer and an adhesive coating layer coated on one side of the substrate layer. The substrate layer is an OPS substrate, and the adhesive coating layer is an acrylic adhesive.

[0009] The initial thickness of the expansion tape is between 0.1 mm and 1.0 mm. After the expansion tape is immersed in the electrolyte for several hours, the expansion tape will expand along its thickness direction to 3-5 times of the initial thickness.

[0010] The expansion core tube comprises a core tube and an adhesive layer coated on the surface of the core tube, and the adhesive layer is acrylic adhesive.

[0011] The initial thickness of the adhesive layer is between 0.1 mm and 3.0 mm. After the adhesive layer is immersed in the electrolyte for several hours, the adhesive layer will expand along its thickness direction to 3-5 times of the initial thickness.

[0012] The expansion core tube comprises a core tube, an adhesive layer coated on the surface of the core tube, and a foam layer compounded with the adhesive layer.

[0013] The adhesive layer is acrylic adhesive, and the foam layer is PU foam or PE foam.

[0014] The beneficial effects of the utility model are as follows: the utility model is a cylindrical lithium-ion battery with a core tube wrapped with an expansion tape. During use, after the expansion core tube is introduced, the battery cell is wound and then inserted into the expansion core tube, so as to reserve some space for stress release of the battery cell and reserve space for electrode expansion during battery cell baking. After the battery is filled with liquid, the expansion tape on the core tube is soaked in the electrolyte and the expansion tape will expand along its thickness direction, thereby playing a role of central support. In addition, by wrapping the surface of an ordinary core tube with the expansion tape, the problem of increased stress in the core of the cylindrical battery during the cycle, which leads to core collapse, and ultimately affects the cycle life of the cylindrical battery, can be effectively solved. The utility model can solve the problem of too large a gap to provide support due to assembly reasons, and can solve the problem of stress release space in the cylindrical battery manufacturing process after the core tube is introduced, while improving production efficiency. The utility model has the advantages of reasonable structure, good support effect, effective relief of core collapse, and extended cycle life. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0016] Figure 2 It is a schematic diagram of a first embodiment of the expansion core tube of the utility model.

[0017] Figure 3 It is a schematic diagram of a second embodiment of the expansion core tube of the utility model.

[0018] Figure 4 It is a schematic diagram of a third embodiment of the expansion core tube of the utility model.

[0019] In the figure: 101, light cover 102, pole 103, upper aluminum block 104, insulating plastic 105, expansion tape 106, ordinary core tube 107, battery cell negative plate 108, battery cell 109, battery cell positive electrode 110, positive electrode connecting piece 111, aluminum shell 200, expansion core tube 201, core tube 202, adhesive layer 203, foam layer. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the accompanying drawings. Example

[0021] like Figure 1-4 As shown, a cylindrical lithium-ion battery with a core tube wrapped with an expansion tape comprises a battery cell 108, wherein the battery cell 108 comprises a battery cell negative plate 107 and a battery cell positive electrode 109, an aluminum shell 111 is arranged below the battery cell positive electrode 109, the battery cell positive electrode 109 is connected to the aluminum shell 111 through a positive electrode connecting sheet 110, a core tube body is arranged on the top of the battery cell negative plate 107, an expansion tape 105 is arranged on one side of the core tube body, and a light cover plate 101 is also arranged above the battery cell negative plate 107.

[0022] An insulating plastic 104 is disposed on the top surface of the optical cover plate 101 , a pole 102 is disposed inside the insulating plastic 104 , and an upper aluminum block 103 is disposed outside the connection between the upper surface of the insulating plastic 104 and the pole 102 .

[0023] The core tube body is a common core tube 106 without an expansion layer, and the base material of the common core tube 106 is one of stainless steel or PPS+GF.

[0024] The expansion tape 105 includes a substrate layer and an adhesive coating layer coated on one side of the substrate layer. The substrate layer is an OPS substrate, and the adhesive coating layer is an acrylic adhesive.

[0025] The initial thickness of the expansion tape 105 is between 0.1 mm and 1.0 mm. After the expansion tape 105 is immersed in the electrolyte for several hours, the expansion tape 105 will expand along its thickness direction to 3-5 times of the initial thickness.

[0026] In this embodiment, the expansion tape includes a substrate layer and an adhesive layer coated on one side of the substrate layer, wherein the substrate layer is an OPS substrate and the adhesive layer is an acrylic adhesive; the initial thickness of the expansion tape is between 0.1 mm and 1.0 mm. After the expansion tape is soaked in the electrolyte for several hours, the expansion tape will expand along its thickness direction to 3-5 times of the initial thickness, and the thickness will not change, thereby playing a role in supporting the core of the cylindrical battery and effectively alleviating the problem of core collapse.

[0027] The utility model is a cylindrical lithium ion battery with a core tube wrapped with an expansion tape. In use, after the expansion core tube 200 is introduced, the battery cell 108 is wound and inserted into the expansion core tube 200, so as to reserve some space for stress release of the battery cell 108 and reserve space for electrode expansion during baking of the battery cell 108. After the battery is filled with liquid, the expansion tape 105 on the core tube 201 is soaked in the electrolyte, and the expansion tape 105 will expand along its thickness direction, thereby playing a role of central support; in addition, by wrapping the expansion tape 105 on the surface of the ordinary core tube 106, the problem of core collapse caused by increased stress in the core of the cylindrical battery during the cycle process can be effectively solved, which ultimately affects the cycle life of the cylindrical battery; the utility model can solve the problem of too large a gap for support due to assembly reasons, and can solve the problem of stress release space in the process of manufacturing the cylindrical battery after the core tube is introduced, while improving production efficiency; the utility model has the advantages of reasonable structure, good support effect, effective relief of core collapse, and extended cycle life. Example

[0028] like Figure 1-4 As shown, a cylindrical lithium-ion battery with a core tube wrapped with an expansion tape comprises a battery cell 108, wherein the battery cell 108 comprises a battery cell negative plate 107 and a battery cell positive electrode 109, an aluminum shell 111 is arranged below the battery cell positive electrode 109, the battery cell positive electrode 109 is connected to the aluminum shell 111 through a positive electrode connecting sheet 110, a core tube body is arranged on the top of the battery cell negative plate 107, an expansion tape 105 is arranged on one side of the core tube body, and a light cover plate 101 is also arranged above the battery cell negative plate 107.

[0029] An insulating plastic 104 is disposed on the top surface of the optical cover plate 101 , a pole 102 is disposed inside the insulating plastic 104 , and an upper aluminum block 103 is disposed outside the connection between the upper surface of the insulating plastic 104 and the pole 102 .

[0030] The core tube body is an expansion core tube 200 , and the expansion core tube 200 includes a common core tube 106 and an expansion tape 105 wrapped around the outside of the common core tube 106 .

[0031] The expansion tape 105 includes a substrate layer and an adhesive coating layer coated on one side of the substrate layer. The substrate layer is an OPS substrate, and the adhesive coating layer is an acrylic adhesive.

[0032] The initial thickness of the expansion tape 105 is between 0.1 mm and 1.0 mm. After the expansion tape 105 is immersed in the electrolyte for several hours, the expansion tape 105 will expand along its thickness direction to 3-5 times of the initial thickness.

[0033] In this embodiment, the expansion core tube includes an ordinary core tube (without expansion layer) and an adhesive layer (expansion layer) coated on the surface of the core tube. The core tube substrate is PPS+GF, but not limited to this material; the adhesive layer is an acrylic adhesive, but not limited to this material; the initial thickness of the expansion layer is between 0.1mm-3.0mm, and after the expansion adhesive layer is immersed in the electrolyte for several hours, the expansion adhesive layer will expand along its thickness direction to 3-5 times the initial thickness, and the thickness will not change again, thereby playing a role in supporting the core of the cylindrical battery and effectively alleviating the problem of core collapse.

[0034] The utility model is a cylindrical lithium ion battery with a core tube wrapped with an expansion tape. In use, after the expansion core tube 200 is introduced, the battery cell 108 is wound and inserted into the expansion core tube 200, so as to reserve some space for stress release of the battery cell 108 and reserve space for electrode expansion during baking of the battery cell 108. After the battery is filled with liquid, the expansion tape 105 on the core tube 201 is soaked in the electrolyte, and the expansion tape 105 will expand along its thickness direction, thereby playing a role of central support; in addition, by wrapping the expansion tape 105 on the surface of the ordinary core tube 106, the problem of core collapse caused by increased stress in the core of the cylindrical battery during the cycle process can be effectively solved, which ultimately affects the cycle life of the cylindrical battery; the utility model can solve the problem of too large a gap for support due to assembly reasons, and can solve the problem of stress release space in the process of manufacturing the cylindrical battery after the core tube is introduced, while improving production efficiency; the utility model has the advantages of reasonable structure, good support effect, effective relief of core collapse, and extended cycle life. Example

[0035] like Figure 1-4 As shown, a cylindrical lithium-ion battery with a core tube wrapped with an expansion tape comprises a battery cell 108, wherein the battery cell 108 comprises a battery cell negative plate 107 and a battery cell positive electrode 109, an aluminum shell 111 is arranged below the battery cell positive electrode 109, the battery cell positive electrode 109 is connected to the aluminum shell 111 through a positive electrode connecting sheet 110, a core tube body is arranged on the top of the battery cell negative plate 107, an expansion tape 105 is arranged on one side of the core tube body, and a light cover plate 101 is also arranged above the battery cell negative plate 107.

[0036] An insulating plastic 104 is disposed on the top surface of the optical cover plate 101 , a pole 102 is disposed inside the insulating plastic 104 , and an upper aluminum block 103 is disposed outside the connection between the upper surface of the insulating plastic 104 and the pole 102 .

[0037] The expansion core tube 200 includes a core tube 201 and an adhesive layer 202 coated on the surface of the core tube 201 , and the adhesive layer 202 is an acrylic adhesive.

[0038] The initial thickness of the adhesive layer 202 is between 0.1 mm and 3.0 mm. After the adhesive layer 202 is immersed in the electrolyte for several hours, the adhesive layer 202 will expand along its thickness direction to 3-5 times of the initial thickness.

[0039] The expansion core tube 200 includes a core tube 201 , an adhesive layer 202 coated on the surface of the core tube 201 , and a foam layer 203 compounded with the adhesive layer 202 .

[0040] The adhesive layer 202 is acrylic adhesive, and the foam layer 203 is PU foam or PE foam.

[0041] In this embodiment, the expansion core tube includes a non-expansion layer and an expansion layer: the material of the core tube without the expansion layer includes stainless steel, PPS+GF and other materials that are resistant to electrolytes, acid and alkali, battery-friendly and have high strength; the expansion layer includes acrylic adhesive coated or acrylic adhesive composite PU foam, PE foam (with a strong compression ratio), etc. After being infiltrated by the electrolyte, it will expand along its thickness direction to 3-5 times the initial thickness, thereby achieving a strong support effect on the core of the cylindrical battery;

[0042] The utility model transforms the surface material of the core tube so that it has a larger thickness expansion after swelling with the electrolyte, and the thickness does not change after expansion, which can effectively solve the problem that the stress of the core increases during the cycle of the cylindrical battery, causing the core to collapse, and ultimately affecting the cycle life of the cylindrical battery.

[0043] The utility model is a cylindrical lithium ion battery with a core tube wrapped with an expansion tape. In use, after the expansion core tube 200 is introduced, the battery cell 108 is wound and inserted into the expansion core tube 200, so as to reserve some space for stress release of the battery cell 108 and reserve space for electrode expansion during baking of the battery cell 108. After the battery is filled with liquid, the expansion tape 105 on the core tube 201 is soaked in the electrolyte, and the expansion tape 105 will expand along its thickness direction, thereby playing a role of central support; in addition, by wrapping the expansion tape 105 on the surface of the ordinary core tube 106, the problem of core collapse caused by increased stress in the core of the cylindrical battery during the cycle process can be effectively solved, which ultimately affects the cycle life of the cylindrical battery; the utility model can solve the problem of too large a gap for support due to assembly reasons, and can solve the problem of stress release space in the process of manufacturing the cylindrical battery after the core tube is introduced, while improving production efficiency; the utility model has the advantages of reasonable structure, good support effect, effective relief of core collapse, and extended cycle life.

Claims

1. A cylindrical lithium-ion battery with a core tube wrapped with an expansion tape, comprising a battery cell, characterized in that: The battery cell includes a battery cell negative plate and a battery cell positive electrode. An aluminum shell is arranged below the battery cell positive electrode, and the battery cell positive electrode is connected to the aluminum shell through a positive electrode connecting sheet. A core tube body is arranged on the top of the battery cell negative plate, an expansion tape is arranged on one side of the core tube body, and a light cover plate is also arranged above the battery cell negative plate.

2. A cylindrical lithium-ion battery with a core tube wrapped with an expansion tape according to claim 1, characterized in that: The top surface of the light cover plate is provided with insulating plastic, a pole is provided inside the insulating plastic, and an upper aluminum block is provided outside the connection between the upper surface of the insulating plastic and the pole.

3. A cylindrical lithium-ion battery with a core tube wrapped with an expansion tape according to claim 1, characterized in that: The core tube body is a common core tube without an expansion layer, and the common core tube base material is one of stainless steel or PPS+GF.

4. A cylindrical lithium-ion battery with a core tube wrapped with an expansion tape according to claim 1, characterized in that: The core tube body is an expansion core tube, and the expansion core tube comprises a common core tube and an expansion tape wrapped around the outside of the common core tube.

5. A cylindrical lithium-ion battery with a core tube wrapped with an expansion tape according to claim 4, characterized in that: The expansion tape comprises a substrate layer and an adhesive coating layer coated on one side of the substrate layer. The substrate layer is an OPS substrate, and the adhesive coating layer is an acrylic adhesive.

6. A cylindrical lithium-ion battery with a core tube wrapped with an expansion tape according to claim 5, characterized in that: The initial thickness of the expansion tape is between 0.1 mm and 1.0 mm. After the expansion tape is immersed in the electrolyte for several hours, the expansion tape will expand along its thickness direction to 3-5 times of the initial thickness.

7. A cylindrical lithium-ion battery with a core tube wrapped with an expansion tape according to claim 4, characterized in that: The expansion core tube comprises a core tube and an adhesive layer coated on the surface of the core tube, and the adhesive layer is acrylic adhesive.

8. A cylindrical lithium-ion battery with a core tube wrapped with an expansion tape according to claim 7, characterized in that: The initial thickness of the adhesive layer is between 0.1 mm and 3.0 mm. After the adhesive layer is immersed in the electrolyte for several hours, the adhesive layer will expand along its thickness direction to 3-5 times of the initial thickness.

9. A cylindrical lithium-ion battery with a core tube wrapped with an expansion tape according to claim 4 or 7, characterized in that: The expansion core tube comprises a core tube, an adhesive layer coated on the surface of the core tube, and a foam layer compounded with the adhesive layer.

10. A cylindrical lithium-ion battery with a core tube wrapped with an expansion tape according to claim 9, characterized in that: The adhesive layer is acrylic adhesive, and the foam layer is PU foam or PE foam.

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