Soft package cylindrical battery tab connecting structure

Abstract

The utility model discloses a soft package cylindrical battery tab connecting structure which comprises a cylindrical roll core and a cylindrical soft package shell for packaging the roll core, the roll core comprises a first end part and a second end part which are oppositely arranged, the first end part is connected with a positive tab, and the second end part is connected with a negative tab; the positive pole lug extends outwards from the first end part and penetrates out of the soft package shell, and the negative pole lug extends outwards from the second end part and penetrates out of the soft package shell; the part, penetrating out of the soft package shell, of the positive pole lug is bent along the radial direction of the soft package shell to form a first bent section, and first protective paper is arranged between the first bent section and one end part of the soft package shell; the part, penetrating out of the soft package shell, of the negative electrode lug is bent in the radial direction of the soft package shell to form a second bent section, and second protective paper is arranged between the second bent section and the other end of the soft package shell. According to the pole lug connecting structure of the soft package cylindrical battery, the risk of battery damage and short circuit caused by the fact that the exposed pole lug damages the soft package shell can be effectively prevented.

Description

Technical Field

[0001] The utility model belongs to the technical field of secondary batteries, and particularly relates to an ear connection structure for a soft-pack cylindrical battery. Background Art

[0002] In the rapid development of portable electronic devices, lithium-ion batteries have become the mainstream choice of power supply technology due to their excellent high energy density, long cycle life, and good environmental adaptability. In particular, cylindrical lithium-ion batteries have been widely used in various portable devices such as laptops, power tools, and electric vehicles due to their simple manufacturing, low cost, and high energy density. Among them, the 21700 cylindrical battery is particularly favored by the market due to its excellent performance and suitable size.

[0003] However, for existing cylindrical batteries, the outer shell generally adopts a steel shell structure, and there are some problems to be solved urgently. First of all, there are certain safety hazards in the use of steel shell cylindrical batteries, especially in the application fields of products that need to be carried around. This is mainly because the gas generated during the formation process of the steel shell battery will remain inside the battery, resulting in a relatively large internal pressure of the battery. At the same time, the shell of the steel shell cylindrical battery generally uses a relatively thick steel shell material. Once thermal runaway occurs, the battery may explode, causing serious safety hazards and lethality. Secondly, there are some deficiencies in the structural design of the steel shell cylindrical battery. Due to the existence of a gap of about 3 mm between the ear welded to the positive electrode and the wound core, the utilization rate of the internal space of the battery is low, which limits the further improvement of the battery energy density. In addition, the density of the steel shell material itself is relatively large, which also increases the overall weight of the battery to a certain extent and reduces the battery energy density.

[0004] Therefore, the inventor of the present application developed a soft-pack cylindrical battery to solve the above problems. However, the inventor found that the soft-pack cylindrical battery also faces some challenges in actual applications, and the ear connection structure is a key issue. In a soft-pack cylindrical battery, the ear needs to be led out from the end of the soft-pack outer shell for external connection. However, the edge of the cut ear is relatively sharp and prone to burrs, and these burrs may damage the end of the soft-pack outer shell, resulting in serious safety hazards such as electrolyte leakage or battery short circuit. At the same time, the connection reliability between the ear and the soft-pack outer shell also directly affects the performance and life of the battery.

[0005] In view of this, it is necessary to provide a technical solution to solve the above problems. Summary of the Utility Model

[0006] The purpose of the utility model is to provide an ear connection structure for a soft-pack cylindrical battery, which can effectively prevent the risk of the exposed ear damaging the soft-pack outer shell and causing battery damage and short circuit for the deficiencies of the prior art.

[0007] To achieve the above object, the utility model provides the following technical solutions:

[0008] A soft-pack cylindrical battery tab connection structure includes a cylindrical winding core and a cylindrical soft-pack outer shell encapsulating the winding core. The winding core includes a first end portion and a second end portion arranged oppositely. A positive tab is connected to the first end portion, and a negative tab is connected to the second end portion. The positive tab extends outward from the first end portion and penetrates through the soft-pack outer shell, and the negative tab extends outward from the second end portion and penetrates through the soft-pack outer shell.

[0009] A first bending section is formed by bending the part of the positive tab penetrating through the soft-pack outer shell along the radial direction of the soft-pack outer shell. A first protective paper is arranged between the first bending section and one end portion of the soft-pack outer shell. A second bending section is formed by bending the part of the negative tab penetrating through the soft-pack outer shell along the radial direction of the soft-pack outer shell. A second protective paper is arranged between the second bending section and the other end portion of the soft-pack outer shell.

[0010] Preferably, end edge seals are respectively formed at both ends of the soft-pack outer shell, and the end edge seals are horizontally bent along the radial direction of the soft-pack outer shell to form flat folded edges.

[0011] The positive tab extends outward from the first end portion and penetrates through the soft-pack outer shell along the end edge seal, and the part of the positive tab penetrating through the soft-pack outer shell is reversely bent along the edge of the flat folded edge to form the first bending section. The negative tab extends outward from the second end portion and penetrates through the soft-pack outer shell along the end edge seal, and the part of the negative tab penetrating through the soft-pack outer shell is reversely bent along the edge of the flat folded edge to form the second bending section.

[0012] Preferably, a first tab adhesive is arranged between the positive tab and the end edge seal, and a second tab adhesive is arranged between the negative tab and the end edge seal.

[0013] Preferably, fixing adhesive tapes for fixing the first bending section and the second bending section are respectively arranged at both ends of the soft-pack outer shell. The fixing adhesive tapes respectively cover the surfaces of the bending parts of the first bending section and the second bending section, and both ends of the fixing adhesive tapes are respectively fixed on the circumferential side wall of the soft-pack outer shell.

[0014] Preferably, a heat-shrinkable film is tightly sleeved on the outer surface of the soft-pack outer shell, and the heat-shrinkable film tightly presses both ends of the fixing adhesive tape.

[0015] Preferably, the thicknesses of the first protective paper and the second protective paper are respectively 0.1 - 0.5 mm.

[0016] Preferably, adhesive layers are respectively arranged on one surface of the first protective paper and the second protective paper.

[0017] Preferably, the color of the first protective paper is set to a first color, and the color of the second protective paper is set to a second color different from the first color.

[0018] Preferably, the soft package housing is an aluminum-plastic film, and the thickness of the aluminum-plastic film is 0.05 - 0.15 mm.

[0019] Compared with the prior art, the present utility model has at least the following beneficial effects: For the soft package cylindrical battery tab connection structure of the present utility model, the positive tab and the negative tab are respectively led out from both ends of the core and penetrate through the soft package housing; the parts of the positive tab and the negative tab that penetrate through the soft package housing are respectively bent along the radial direction of the soft package housing to form a first bending section and a second bending section. A first protective paper is provided between the first bending section and the second bending section and the end of the soft package housing, and a second protective paper is provided between the second bending section and the end of the soft package housing. This tab connection structure design can effectively prevent the tab burrs from damaging the soft package housing, and at the same time buffer the contact stress between the tab and the soft package housing, avoiding potential safety hazards such as electrolyte leakage or battery short circuit, and greatly improving the safety and reliability of the battery. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of the soft package cylindrical battery tab connection structure according to an embodiment of the present utility model;

[0021] Figure 2 It is an exploded structural diagram of the soft package cylindrical battery tab connection structure according to an embodiment of the present utility model;

[0022] Figure 3 It is a schematic structural diagram of the soft package cylindrical battery tab connection structure according to another embodiment of the present utility model;

[0023] Figure 4 It is an exploded structural diagram of the soft package cylindrical battery tab connection structure according to another embodiment of the present utility model;

[0024] Figure 5 It is a schematic structural diagram of the positive electrode sheet of the soft package cylindrical battery according to an embodiment of the present utility model;

[0025] Figure 6 It is a schematic structural diagram of the negative electrode sheet of the soft package cylindrical battery according to an embodiment of the present utility model.

[0026] In the figure: 1. Core; 11. Positive electrode tab; 12. Negative electrode tab; 13. First tab adhesive; 14. Second tab adhesive; 2. Soft package case; 21. End edge sealing; 3. First protective paper; 4. Second protective paper; 5. Fixing adhesive tape; 6. Heat shrinkable film; 10. Positive current collector; 101. Positive active material layer; 102. First empty foil area; 103. First heat-resistant insulating adhesive tape; 104. Second heat-resistant insulating adhesive tape; 20. Negative current collector; 201. Negative active material layer; 202. Second empty foil area; 203. Third heat-resistant insulating adhesive tape; 204. Fourth heat-resistant insulating adhesive tape. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] In the description of the present application, unless otherwise clearly defined and limited, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance; the term "plurality" means two or more; unless otherwise specified or stated, the terms "connection", "fixation", etc. shall be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0029] Please refer to the attached Figures 1 - 2 A soft-pack cylindrical battery tab connection structure provided by the present application includes a cylindrical core 1, electrolyte, and a cylindrical soft package case 2 for encapsulating the core 1 and the electrolyte; wherein, the core 1 includes a positive electrode sheet, a negative electrode sheet, and a separator disposed between the positive electrode sheet and the negative electrode sheet, and the positive electrode sheet, the separator, and the negative electrode sheet are sequentially laminated and wound to form the core 1; the cylindrical core 1 includes a first end portion and a second end portion arranged opposite to each other, the first end portion is connected with a positive electrode tab 11, and the second end portion is connected with a negative electrode tab 12; the positive electrode tab 11 extends outward from the first end portion and passes through the soft package case 2, and the negative electrode tab 12 extends outward from the second end portion and passes through the soft package case 2;

[0030] The part of the positive electrode tab 11 that penetrates through the soft package shell 2 is bent radially along the soft package shell 2 to form a first bent section, and a first protective paper 3 is arranged between the first bent section and one end of the soft package shell 2; the part of the negative electrode tab 12 that penetrates through the soft package shell 2 is bent radially along the soft package shell 2 to form a second bent section, and a second protective paper 4 is arranged between the second bent section and the other end of the soft package shell 2.

[0031] Among them, a novel soft package cylindrical battery tab connection structure provided by the present application can effectively prevent the exposed tabs from damaging the soft package shell 2, thereby reducing the risk of battery damage and short circuit; by radially bending the exposed part of the tab and adding a protective paper at the bent part, the safety of the battery is greatly enhanced.

[0032] In an embodiment according to the present application, end edges 21 are respectively formed at both ends of the soft package shell 2, and the end edges 21 are horizontally bent radially along the soft package shell 2 to form flat flanges;

[0033] The positive electrode tab 11 extends outward from the first end and penetrates through the soft package shell 2 along the end edge 21, and the part of the positive electrode tab 11 that penetrates through the soft package shell 2 is bent reversely along the edge of the flat flange to form a first bent section; the negative electrode tab 12 extends outward from the second end and penetrates through the soft package shell 2 along the end edge 21, and the part of the negative electrode tab 12 that penetrates through the soft package shell 2 is bent reversely along the edge of the flat flange to form a second bent section. Designing the ends of the soft package shell 2 as edges and horizontally bending them radially to form flat flanges helps to strengthen the overall structural strength of the battery package. At the same time, this design can also provide a safer and more stable channel for the tabs, reducing the mechanical stress on the contact surface between the tabs and the soft package shell 2.

[0034] In an embodiment according to the present application, a first tab adhesive 13 is arranged between the positive electrode tab 11 and the end edge 21, and a second tab adhesive 14 is arranged between the negative electrode tab 12 and the end edge 21. Among them, the tab adhesive can fill the gap between the tab and the end edge 21, improve the sealing performance, and prevent electrolyte leakage; at the same time, the tab adhesive can also play a bonding role, improve the connection reliability between the tab and the end edge 21, and prevent the tab from falling off or loosening.

[0035] In an embodiment according to the present application, fixing adhesive tapes 5 for fixing the first bent section and the second bent section are respectively arranged at both ends of the soft package shell 2, the fixing adhesive tapes 5 respectively cover the surfaces of the bent parts of the first bent section and the second bent section, and both ends of the fixing adhesive tapes 5 are respectively fixed on the circumferential side wall of the soft package shell 2. By arranging the fixing adhesive tapes 5, the tabs can be further fixed, preventing the tabs from shifting or loosening, and improving the connection reliability.

[0036] In an embodiment according to the present application, as Figures 3 - 4As shown, the outer surface of the soft package shell 2 is tightly covered with a heat shrink film 6, and the heat shrink film 6 is pressed tightly against the two ends of the adhesive tape 5. The heat shrink film 6 is tightly covered on the outer surface of the soft package shell 2, which can effectively protect the soft package shell 2; at the same time, the heat shrink film 6 is pressed tightly against the two ends of the adhesive tape 5, which plays a role of further reinforcement and improves the stability and reliability of the entire tab connection structure.

[0037] In one embodiment of the present application, the thickness of the first protective paper 3 and the second protective paper 4 are 0.1-0.5 mm, preferably 0.2 mm, respectively. This thickness range can provide sufficient protection performance while taking into account the convenience of production and processing.

[0038] In one embodiment of the present application, a first protective paper 3 and a second protective paper 4 are provided with an adhesive layer on one surface, respectively. The adhesive layer is an acrylic adhesive, a silicone adhesive, a vinyl acrylate adhesive, a nitrile rubber adhesive or a chloroprene rubber adhesive. By providing an adhesive layer on one surface of the protective paper, the protective paper can be conveniently pasted and fixed between the tab and the soft package shell, and a firm fit between the protective paper and the soft package shell is ensured, providing a lasting protective effect and avoiding the problem of displacement or falling off of the protective paper.

[0039] In one embodiment of the present application, the color of the first protective paper 3 is set to a first color, and the color of the second protective paper 4 is set to a second color different from the first color. Protective papers of different colors are respectively set on the positive electrode tab 11 and the negative electrode tab 12, which can facilitate the distinction and identification of the positive and negative electrodes. For example, the first color and the second color can both be red, orange, yellow, green, cyan, blue or purple, as long as the two colors are different; preferably, the first color is red and the second color is cyan; that is, the first protective paper is preferably red barley paper, and the second protective paper is preferably green barley paper; wherein, the first protective paper and the second protective paper are preferably paper materials with excellent insulation properties and low cost, which can control material costs while providing good insulation protection, and have a high cost performance.

[0040] In one embodiment of the present application, the soft-pack shell 2 is an aluminum-plastic film, and the thickness of the aluminum-plastic film is 0.05 to 0.15 mm. Compared with the traditional steel shell, the aluminum-plastic film is thinner and lighter, which can effectively reduce the weight of the battery and improve the energy density. At the same time, the aluminum-plastic film has high barrier properties and mechanical strength, which can effectively prevent the intrusion of external water and oxygen and extend the battery life. In the case of thermal runaway, the aluminum-plastic film can also release internal pressure by expanding and deforming, avoid battery explosion, and improve safety performance.

[0041] In one embodiment according to the present application, Figure 5As shown, the positive electrode sheet includes a positive electrode current collector 10 and a positive electrode active material layer 101 provided on at least one surface of the positive electrode current collector 10; a first empty foil area 102 is provided at the middle position of the positive electrode sheet, and a positive electrode tab 11 is provided in the first empty foil area 102; the middle position of the positive electrode sheet is between 3 / 8 and 5 / 8 of the length direction of the positive electrode sheet. Among them, arranging the positive electrode tab in the middle of the positive electrode sheet can effectively reduce the resistance inside the battery cell, thereby improving the output power and energy density of the battery cell; in addition, it can also effectively disperse the current and temperature inside the battery cell, reduce the risk of thermal runaway and explosion inside the battery cell, thereby improving the safety of the battery cell.

[0042] In an embodiment according to the present application, as Figure 6 As shown, the negative electrode sheet includes a negative electrode current collector 20 and a negative electrode active material layer 201 provided on at least one surface of the negative electrode current collector 20; a second empty foil area 202 is provided at the middle position of the negative electrode sheet, and a negative electrode tab 12 is provided in the second empty foil area 202; the middle position of the negative electrode sheet is between 3 / 8 and 5 / 8 of the length direction of the negative electrode sheet. Among them, arranging the negative electrode tab in the middle of the negative electrode sheet can effectively reduce the resistance inside the battery cell, thereby improving the output power and energy density of the battery cell; in addition, it can also effectively disperse the current and temperature inside the battery cell, reduce the risk of thermal runaway and explosion inside the battery cell, thereby improving the safety of the battery cell.

[0043] In an embodiment according to the present application, as Figure 5 As shown, the positive electrode tab 11 includes a first section and a second section, the first section is located inside the first empty foil area 102, and the second section is located outside the first empty foil area 102;

[0044] The first empty foil area 102 is attached with a first heat-resistant insulating adhesive tape 103 and a second heat-resistant insulating adhesive tape 104, and the heat-resistant temperature of the first heat-resistant insulating adhesive tape 103 and the second heat-resistant insulating adhesive tape 104 ≥ 130°C; preferably, the heat-resistant temperatures of the first heat-resistant insulating adhesive tape 103 and the second heat-resistant insulating adhesive tape 104 are both 130°C - 500°C. Generally speaking, the higher the heat-resistant temperature of the heat-resistant insulating adhesive tape, the better, and in order to improve the safety of the battery cell, it generally needs to be higher than the heat shrinkage temperature of the separator film;

[0045] In the Y direction, the first heat-resistant insulating adhesive tape 103 extends beyond the edge of the positive electrode current collector 10 by 0 - 2.5 mm and completely covers the surface of the first section of the positive electrode tab 11;

[0046] The second heat-resistant insulating adhesive tape 104 completely covers the surface of the first section of the positive electrode tab 11 and partially covers the surface of the second section of the positive electrode tab 11;

[0047] In the X direction, the second heat-resistant insulating adhesive tape 104 extends beyond the edge of the positive electrode tab 11 by 0 - 2.5 mm.

[0048] On the one hand, by providing the first heat-resistant insulating tape 103 and the second heat-resistant insulating tape 104, the positive electrode sheet of the present application can not only prevent the positive and negative electrodes from coming into direct contact due to the heat shrinkage of the separator membrane, but also effectively cover the burrs on the edge of the current collector and the tab, preventing the occurrence of short circuit of the battery cell and improving the safety of use of the battery cell. On the other hand, by simultaneously providing the first heat-resistant insulating tape 103 and the second heat-resistant insulating tape 104 and controlling the sizes of the first heat-resistant insulating tape 103 and the second heat-resistant insulating tape 104, the positive electrode sheet of the present application can avoid the insulating tape being too large and will not affect the top sealing of the aluminum-plastic film, improving the stability and reliability of the battery cell performance.

[0049] In an embodiment according to the present application, a first tab adhesive 13 is provided on the second section of the positive electrode tab 11; along the Y direction, the distance between the upper edge of the second heat-resistant insulating tape 104 and the lower edge of the first tab adhesive 13 is 0.5 - 2.5 mm.

[0050] In an embodiment according to the present application, the area of the first heat-resistant insulating tape 103 is larger than the area of the second heat-resistant insulating tape 104. Preferably, the area ratio of the first heat-resistant insulating tape 103 to the second heat-resistant insulating tape 104 is 1:(0.8 - 0.1). Among them, the second heat-resistant insulating tape 104 is usually attached along the length direction (Y direction) of the positive electrode tab 11, and the attached area should cover the positive electrode tab 11, so that it can not only cover the burrs on the edge of the positive electrode tab 11, but also avoid the insulating tape being too large to affect the top sealing of the aluminum-plastic film, and can also reduce the waste of the insulating tape.

[0051] In an embodiment according to the present application, the area of the first heat-resistant insulating tape 103 accounts for 50 - 120% of the area of the first empty foil area 102; preferably, the area of the first heat-resistant insulating tape 103 accounts for 100 - 120% of the area of the first empty foil area 102, which has better insulation effect and safety performance.

[0052] In an embodiment according to the present application, as Figure 6 shown, the negative electrode tab 12 includes a third section and a fourth section, the third section is located within the second empty foil area 202, and the fourth section is located outside the second empty foil area 202;

[0053] The second empty foil area 202 is attached with a third heat-resistant insulating tape 203 and a fourth heat-resistant insulating tape 204, and the heat-resistant temperature of the third heat-resistant insulating tape 203 and the fourth heat-resistant insulating tape 204 is ≥ 130 °C; preferably, the heat-resistant temperature of the third heat-resistant insulating tape 203 and the fourth heat-resistant insulating tape 204 is 130 °C - 500 °C. Generally speaking, the higher the heat-resistant temperature of the heat-resistant insulating tape, the better. In order to improve the safety of the battery cell, it is generally required to be higher than the heat shrinkage temperature of the separator membrane;

[0054] In the Y direction, the third heat-resistant insulating adhesive tape 203 extends 0 - 2.5 mm beyond the edge of the negative current collector 20 and completely covers the surface of the third section of the negative electrode tab 12.

[0055] The fourth heat-resistant insulating adhesive tape 204 completely covers the surface of the third section of the negative electrode tab 12 and partially covers the surface of the fourth section of the negative electrode tab 12.

[0056] In the X direction, the fourth heat-resistant insulating adhesive tape 204 extends 0 - 2.5 mm beyond the edge of the negative electrode tab 12.

[0057] On the one hand, by arranging the third heat-resistant insulating adhesive tape 203 and the fourth heat-resistant insulating adhesive tape 204 on the negative electrode sheet of the present application, it can not only prevent the positive and negative electrodes from coming into direct contact due to the thermal shrinkage of the separator membrane, but also effectively cover the burrs on the edges of the current collector and the electrode tab, preventing the occurrence of short circuits in the battery cell and improving the safety of using the battery cell. On the other hand, by simultaneously arranging the third heat-resistant insulating adhesive tape 203 and the fourth heat-resistant insulating adhesive tape 204 on the negative electrode sheet of the present application and controlling the sizes of the third heat-resistant insulating adhesive tape 203 and the fourth heat-resistant insulating adhesive tape 204, the situation of the insulating adhesive tape being too large is avoided, which will not affect the top sealing of the aluminum-plastic film, and the stability and reliability of the battery cell performance are improved.

[0058] In an embodiment according to the present application, a second electrode tab adhesive 14 is provided on the fourth section of the negative electrode tab 12. In the Y direction, the distance between the upper edge of the fourth heat-resistant insulating adhesive tape 204 and the lower edge of the second electrode tab adhesive 14 is 0.5 - 2.5 mm.

[0059] In an embodiment according to the present application, the area of the third heat-resistant insulating adhesive tape 203 is larger than the area of the fourth heat-resistant insulating adhesive tape 204. Preferably, the area ratio of the third heat-resistant insulating adhesive tape 203 to the fourth heat-resistant insulating adhesive tape 204 is 1:(0.8 - 0.1). Among them, the fourth heat-resistant insulating adhesive tape 204 is usually attached along the length direction (Y direction) of the negative electrode tab 12, and the attached area should cover the negative electrode tab 12, so that it can not only cover the burrs on the edge of the negative electrode tab 12, but also avoid the situation that the size of the adhesive tape is too large to affect the top sealing of the aluminum-plastic film, and can also reduce the waste of the adhesive tape.

[0060] In an embodiment according to the present application, the area of the third heat-resistant insulating adhesive tape 203 accounts for 50 - 120% of the area of the second empty foil area 202; preferably, the area of the third heat-resistant insulating adhesive tape 203 accounts for 100 - 120% of the area of the second empty foil area 202, so as to have better insulation effect and safety performance.

[0061] In an embodiment according to the present application, the first heat-resistant insulating adhesive tape 103, the second heat-resistant insulating adhesive tape 104, the third heat-resistant insulating adhesive tape 203, and the fourth heat-resistant insulating adhesive tape 204 each include a base material and an adhesive layer provided on the surface of the base material; the base material is PP, PET, PI, PE, PTFE, PA, PU, or acrylic, and the adhesive layer is an acrylic adhesive, a silicone adhesive, a vinyl acetate adhesive, a nitrile rubber adhesive, or a neoprene adhesive. Among them, the heat-resistant insulating adhesive tapes of the above materials all have good high-temperature resistance and insulation properties; in addition, it should be noted that heat-resistant insulating adhesive tapes of other materials can also be used as long as they can meet the corresponding temperature resistance and insulation requirements.

[0062] It should be noted that the content not described in detail in this specification belongs to the prior art well-known to those skilled in the art and will not be elaborated here.

[0063] According to the disclosure and teachings of the above specification, those skilled in the art of the present utility model can also make changes and modifications to the above embodiments. Therefore, the present utility model is not limited to the above specific embodiments, and any obvious improvements, substitutions, or variations made by those skilled in the art based on the present utility model all fall within the protection scope of the present utility model. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present utility model.

Claims

1. A connecting structure for the tabs of a soft-pack cylindrical battery, characterized in that: It includes a cylindrical winding core and a cylindrical soft-pack housing encapsulating the winding core. The winding core includes a first end portion and a second end portion which are oppositely arranged. A positive electrode tab is connected to the first end portion, and a negative electrode tab is connected to the second end portion. The positive electrode tab extends outward from the first end portion and penetrates through the soft-pack housing. The negative electrode tab extends outward from the second end portion and penetrates through the soft-pack housing. The portion of the positive electrode tab that penetrates through the soft-pack housing is bent radially along the soft-pack housing to form a first bent section. A first protective paper is provided between the first bent section and one end portion of the soft-pack housing. The portion of the negative electrode tab that penetrates through the soft-pack housing is bent radially along the soft-pack housing to form a second bent section. A second protective paper is provided between the second bent section and the other end portion of the soft-pack housing.

2. The soft-pack cylindrical battery tab connection structure according to claim 1, wherein: End edge seals are respectively formed at both end portions of the soft-pack housing. The end edge seals are horizontally bent radially along the soft-pack housing to form flat folded edges. The positive electrode tab extends outward from the first end portion and penetrates through the soft-pack housing along the end edge seal. The portion of the positive electrode tab that penetrates through the soft-pack housing is bent reversely along the edge of the flat folded edge to form the first bent section. The negative electrode tab extends outward from the second end portion and penetrates through the soft-pack housing along the end edge seal. The portion of the negative electrode tab that penetrates through the soft-pack housing is bent reversely along the edge of the flat folded edge to form the second bent section.

3. The soft-pack cylindrical battery tab connection structure according to claim 2, wherein: A first tab adhesive is provided between the positive electrode tab and the end edge seal. A second tab adhesive is provided between the negative electrode tab and the end edge seal.

4. The soft-pack cylindrical battery tab connection structure according to any one of claims 1 to 3, characterized in that: Fixing adhesive tapes for fixing the first bent section and the second bent section are respectively provided at both end portions of the soft-pack housing. The fixing adhesive tapes respectively cover the surfaces of the bending portions of the first bent section and the second bent section, and both ends of the fixing adhesive tapes are respectively fixed to the circumferential side wall of the soft-pack housing.

5. The soft-pack cylindrical battery tab connection structure according to claim 4, characterized in that: A heat-shrinkable film is tightly sleeved on the outer surface of the soft-pack housing, and the heat-shrinkable film tightly presses both ends of the fixing adhesive tapes.

6. The soft-pack cylindrical battery tab connection structure according to claim 1, wherein: The thicknesses of the first protective paper and the second protective paper are respectively 0.1 - 0.5 mm.

7. The tab connection structure of the pouch cylindrical battery according to claim 1, wherein: Adhesive layers are respectively provided on one surface of the first protective paper and the second protective paper.

8. The soft-pack cylindrical battery tab connection structure according to claim 1, wherein: The color of the first protective paper is set as a first color, and the color of the second protective paper is set as a second color different from the first color.

9. The soft-pack cylindrical battery tab connection structure according to claim 1, wherein: The soft-pack housing is an aluminum-plastic film, and the thickness of the aluminum-plastic film is 0.05 - 0.15 mm.

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