Battery cell, battery and electric equipment
By installing insulating sealing sleeves on the tabs of the battery cells, the problems of exposed foil and misaligned adhesive tape at the cell welding points are solved, improving the safety and stability of the battery and avoiding the risk of excessive sealing thickness and short circuit.
Patent Information
- Application Number
- CN202422650750.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2034-10-31
AI Technical Summary
In existing technologies, when applying protective tape to the cell connection welding point, problems such as foil exposure, tape wrinkling, and misalignment can easily occur, leading to excessive sealing thickness or battery short circuits.
An insulating sealing sleeve is used to cover the overlapping area of the first and second tabs of the battery cell, replacing the traditional protective tape. The insulating sealing sleeve includes first and second areas, which respectively cover the tabs and the overlapping area. It is sealed by heat shrinking or heat pressing to ensure insulation and prevent misalignment.
It effectively avoids adhesive tape wrinkles and misalignments, prevents foil exposure, improves battery safety and stability, and avoids the risk of excessive seal thickness and battery short circuit.
Smart Images
Figure CN223693330U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of battery, concretely relates to electric core, battery and electric equipment. BACKGROUND
[0002] Lithium ion battery as a new type of secondary battery has the advantages of high energy density and power density, high working voltage, light weight, small size, long cycle life, good safety, green environmental protection and the like, and has wide application prospects in portable electrical appliances, electric tools, large energy storage, electric transportation power supply and the like.
[0003] In the prior art, after the switching welding of the electric core is completed, protective adhesive paper needs to be pasted on the front and back surfaces of the welded position. After the electric core is packaged, the protective adhesive paper is located between the electric core and the aluminum plastic film, and is used for isolating and insulating the electric core and the aluminum plastic film. With the decrease of the thickness of the electric core, the pasting precision of the protective adhesive paper is also improved. However, after the adhesive paper is pasted, problems such as foil exposure, wrinkling of the protective adhesive paper and misplacement of the protective adhesive paper are prone to occur. UTILITY MODEL CONTENTS
[0004] The utility model discloses to the technical problems of the prior art, and provides an electric core, a battery and an electric equipment, which solve the technical problems of foil exposure, wrinkling of the protective adhesive paper and misplacement of the protective adhesive paper when the protective adhesive paper is pasted on the switching welding position of the electric core in the prior art.
[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:
[0006] In the first aspect, the utility model provides an electric core, which comprises an electric core body and a first tab, a second tab is arranged on the electric core body, the first tab is electrically connected with the second tab, an insulating sealing sleeve is arranged on the second tab, and the insulating sealing sleeve covers at least a first overlapping area of the first tab and the second tab.
[0007] Preferably, the insulating sealing sleeve covers the second tab.
[0008] Preferably, the first tab has a second overlapping area for overlapping with an aluminum plastic film, the insulating sealing sleeve has a first area and a second area, the first area and the second area are connected, the first area covers the second tab, and the second area covers the second overlapping area.
[0009] Preferably, the first tab further has a bending area and an exposed area for extending to the outside of the aluminum plastic film, the bending area is arranged between the first overlapping area and the second overlapping area, and the second area further covers the bending area and part of the exposed area.
[0010] Preferably, a first through hole is arranged on the bending area, and a second through hole is arranged on the second area, and the first through hole and the second through hole are in position correspondence.
[0011] Preferably, a plurality of the second tabs are arranged, and the plurality of the second tabs are arranged in layers along the thickness direction of the battery body and form a tab group, at least one third through hole is arranged on the first tab, one end of the tab group passes through the third through hole and is electrically connected with the other end of the tab group, and the insulating sealing sleeve covers the tab group.
[0012] Preferably, the lengths of the plurality of the second tabs increase in sequence along the thickness direction of the battery body.
[0013] Preferably, the width of the first tab and the width of the insulating sealing sleeve satisfy the relationship a:b = 1:(1.1-1.4), wherein a is the width of the insulating sealing sleeve, and b is the width of the first tab.
[0014] In a second aspect, the utility model provides a kind of battery, including aluminium plastic film and above-mentioned embodiment battery, the aluminium plastic film is provided with accommodating cavity, and the battery is arranged in the accommodating cavity, and the first tab part extends to the outside of the aluminium plastic film.
[0015] In a third aspect, the utility model provides a kind of electrical equipment, including the battery of above-mentioned embodiment.
[0016] Compared with prior art, the utility model obtains the beneficial effect that:
[0017] The battery body and the first tab are used in cooperation, the second tab is arranged on the battery body, the first tab is electrically connected with the second tab, the insulating sealing sleeve is arranged on the second tab, the insulating sealing sleeve covers at least the first overlapping area of the first tab and the second tab, the insulating sealing sleeve is used instead of protective adhesive tape, the insulating sealing sleeve is not prone to wrinkling, and the appearance bump problem caused by the wrinkling of the main body of the adhesive tape is avoided.The insulating sealing sleeve can also avoid the misalignment problem that may occur when the upper and lower protective adhesive tapes are attached, thereby avoiding the protective adhesive tape being misaligned and pressed into the seal inside, which may cause the seal thickness to exceed the standard, even form a false seal, and further cause the liquid leakage problem.The insulating sealing sleeve can effectively prevent the foil from being exposed and effectively avoid the burrs on the foil from piercing the aluminium plastic film to cause battery short circuit.
[0018] Additional aspects and advantages of the utility model will be partially given in the following description, partially will become obvious from the following description, or be understood by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS
[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.
[0020] Fig. 1 It is a structural schematic diagram of the battery cell of the present application.
[0021] Fig. 2 It is a structural schematic diagram of the battery cell of the present application.
[0022] Fig. 3 It is a structural schematic diagram of the battery cell of the present application.
[0023] Fig. 4 It is a structural schematic diagram of the first and second tab connection of the present application.
[0024] Fig. 5 It is a structural schematic diagram of the first tab of the present application.
[0025] Fig. 6 It is a structural schematic diagram of the insulation sealing sleeve of the present application.
[0026] Fig. 7 It is a structural schematic diagram of the insulation sealing sleeve of the present application.
[0027] Among them, the following is the explanation of the reference signs:
[0028] 100, battery cell;
[0029] 10, battery cell body;
[0030] 20, first tab; 21, second overlapping area; 22, bending area; 221, first through hole; 23, exposed area; 24, third through hole;
[0031] 30, second tab;
[0032] 40, insulation sealing sleeve; 41, first area; 42, second area; 421, second through hole;
[0033] 50, first overlapping area;
[0034] k, thickness direction of the battery cell body; c, length of the second tab. DETAILED DESCRIPTION
[0035] If certain terms are used in the specification and claims to refer to specific components, those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The term "comprising" as used throughout the specification and claims is an open-ended term and should be interpreted as "comprising but not limited to." "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error.
[0036] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be interpreted as indicating or implying relative importance.
[0037] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0038] The following will be combined with the appendix Figs. 1-7 The technical solutions in the embodiments of this utility model are clearly and completely described. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.
[0039] The electrical equipment described in this utility model embodiment includes a battery. The electrical equipment can be automobiles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Automobiles can be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc.; spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application embodiment does not impose any special limitations on the above-mentioned electrical equipment.
[0040] The utility model discloses an embodiment of battery, including aluminium plastic film and electric core, the aluminium plastic film is provided with the accommodation cavity, the electric core sets in the accommodation cavity, the first tab part extends to the aluminium plastic film outside.
[0041] Please refer to Figs. 1-7 The utility model discloses an embodiment of electric core 100, including electric core body 10 and first tab 20, be provided with second tab 30 on electric core body 10, first tab 20 with second tab 30 electricity is connected, be provided with insulating sealing sleeve 40 on second tab 30, insulating sealing sleeve 40 at least covers first overlap area 50 of first tab 20 and second tab 30.
[0042] Compared with prior art, the utility model discloses an embodiment of electric core 100, through the cooperation of electric core body 10 and first tab 20, be provided with second tab 30 on electric core body 10, first tab 20 with second tab 30 electricity is connected, be provided with insulating sealing sleeve 40 on second tab 30, insulating sealing sleeve 40 at least covers first overlap area 50 of first tab 20 and second tab 30, through using insulating sealing sleeve 40 instead of protective adhesive tape, insulating sealing sleeve 40 is not easy to wrinkle, avoids the appearance convex mark problem that the main body wrinkle of adhesive tape brought. Insulating sealing sleeve 40 can also avoid the misplacement problem that the upper and lower protective adhesive tape can appear when sticking, thereby avoiding that protective adhesive tape is pressed into the seal inside by misplacement, possibly leads to seal thickness to be out of limit, even forms false seal, and further causes the problem of leakage. Meanwhile insulating sealing sleeve 40 can effectively prevent foil exposure, effectively avoid the burr on foil and pierce aluminium plastic film and lead to battery short circuit.
[0043] It can be understood that after first tab 20 is welded with second tab 30, insulating sealing sleeve 40 is arranged on second tab 30, and is sealed and wrapped by heat shrinkage or hot pressing, to ensure that insulating sealing sleeve 40 has good isolation insulation function.
[0044] Please refer to Figs. 1-2 And Fig. 4 In some embodiments, the insulating sealing sleeve 40 covers the second tab 30. By adopting the insulating sealing sleeve 40 to cover the second tab 30, an insulating layer is effectively formed on the second tab 30, thereby avoiding the second tab 30 from contacting the end face of the electric core 100 when the electric core 100 is folded, which can cause battery short circuit. At the same time, the insulating sealing sleeve 40 can also effectively avoid the burr on the second tab 30 from piercing the aluminum plastic film, which can cause battery short circuit.
[0045] Please refer to Figs. 1-2 , Fig. 4 And Fig. 7In some embodiments, the first tab 20 has a second overlap area 21 for overlapping with the aluminum plastic film, the insulating sealing sleeve 40 has a first area 41 and a second area 42, the first area 41 and the second area 42 are connected, the first area 41 covers the second tab 30, and the second area 42 covers the second overlap area 21. By using the first area 41 and the second area 42 together, the first area 41 of the insulating sealing sleeve 40 is used to cover the second tab 30, effectively forming an insulating layer on the second tab 30, thereby avoiding the contact between the second tab 30 and the end face of the battery cell 100 when the battery cell 100 is folded, which can cause a short circuit of the battery. The second area 42 of the insulating sealing sleeve 40 is used to cover the second overlap area 21, effectively enabling the insulating sealing sleeve 40 to replace the tab adhesive, which not only effectively reduces the cost, but also avoids the overlap between the tab adhesive and the insulating sealing sleeve 40, which can cause the thickness of the seal to exceed the standard.
[0046] Please refer to Figs. 1-2 In some embodiments, the first tab 20 also has a bending area 22 and an exposed area 23 for extending outside the aluminum plastic film, the bending area 22 is arranged between the first overlap area 50 and the second overlap area 21, and the second area 42 also covers the bending area 22 and part of the exposed area 23. By using the bending area 22 and the exposed area 23 together, the bending area 22 of the first tab 20 is used to bend in cooperation with the second tab 30 when the battery cell 100 is folded, thereby folding the second tab 30 and part of the first tab 20 inside the aluminum plastic film. By covering the bending area 22 with the second area 42 of the insulating sealing sleeve 40, not only can the contact between the bending area 22 and the end face of the battery cell 100 be avoided, which can cause a short circuit of the battery, but also the burrs on the bending area 22 can be effectively avoided, which can pierce the aluminum plastic film and cause a short circuit of the battery. The exposed area 23 of the first tab 20 extends outside the aluminum plastic film and is used for electrical connection with an external power source. By covering part of the exposed area 23 with the second area 42 of the insulating sealing sleeve 40, the second area 42 of the insulating sealing sleeve 40 is partially exposed to the aluminum plastic film, thereby effectively improving the consistency of the exposed size of the insulating sealing sleeve 40.
[0047] Please refer to Figs. 1-2 , Figs. 1-5 and Figs. 1-3In some embodiments, the first through hole 221 is arranged on the bending area 22 of the first tab 20, and the second through hole 421 is arranged on the second area 42 of the insulation sealing sleeve 40. The first through hole 221 and the second through hole 421 are positionally corresponding. Through the cooperation of the first through hole 221 and the second through hole 421, the first through hole 221 arranged on the bending area 22 of the first tab 20 can effectively reduce the toughness of the bending area 22 of the first tab 20 and reduce deformation. This is because the presence of the first through hole 221 makes the bending area 22 of the first tab 20 more prone to stress concentration at the first through hole 221 when subjected to external forces, thereby guiding the bending path, reducing unnecessary material accumulation and stress concentration, and making the bending process smoother and more controllable. Reducing the toughness of the bending area 22 of the first tab 20 helps to achieve a more precise bending shape and angle when the tabs of the battery cell 100 are bent, improving production efficiency. At the same time, reducing deformation also means reducing the adverse effects of mechanical stress generated during the bending process on the internal structure of the battery, improving the overall stability and safety of the battery.
[0048] It can be understood that the number of first through holes 221 and the number of second through holes 421 can be adjusted according to actual needs.
[0049] Please refer to Fig. 4 In some embodiments, a plurality of second tabs 30 are arranged, and the plurality of second tabs 30 are stacked and form a tab group along the thickness direction k of the battery cell body 10. At least one third through hole 24 is arranged on the first tab 20, one end of the tab group passes through the third through hole 24 and is electrically connected to the other end of the tab group, and the insulation sealing sleeve 40 covers the tab group. Through the arrangement of the tab group, one end of the tab group passes through the third through hole 24 of the first tab 20 and is electrically connected to the other end of the tab group, effectively enabling the tab group to cover the root of the first tab 20, and then welding the tab group and the first tab 20 together by laser welding or the like, which helps to improve the consistency of the position of the tab after the tab of the battery cell 100 is bent. At the same time, it can effectively improve the virtual welding and improve the welding effect of the tab. In addition, the insulation sealing sleeve 40 wraps the tab group, effectively insulating and protecting the tab group, avoiding the problem that the burrs of the tab group pierce the aluminum plastic film and cause short circuit of the battery.
[0050] It can be understood that the third through hole 24 is provided with one or more. When the third through hole 24 is provided with a plurality, the tab group can be divided into a plurality of sub-tab groups, and each sub-tab group can pass through the corresponding third through hole 24, thereby avoiding the problem that the tab group is too thick to pass through a single third through hole 24.
[0051] Referring to Figs. 1-2 In some embodiments, the length c of the plurality of second tabs 30 increases sequentially along the thickness direction k of the cell body 10. By setting the length c of the second tab 30, the length c of the second tab 30 increases sequentially along the thickness direction k of the cell body 10. When the plurality of second tabs 30 are stacked and form a tab group, the longer second tab 30 in the tab group can be folded back and welded with the remaining part of the tab group after passing through the third through hole 24 of the first tab 20, thereby reducing the difficulty of the tab group passing through the third through hole 24 of the first tab 20, and effectively wrapping the shorter part of the tab group to prevent the burr of the second tab 30 from piercing the aluminum plastic film and causing the battery to short circuit.
[0052] Referring to Fig. 4 In some embodiments, the width of the first tab 20 and the width of the insulating sealing sleeve 40 satisfy the relationship a:b = 1:(1.1-1.4), where a is the width of the insulating sealing sleeve 40 and b is the width of the first tab 20. By using the width of the first tab 20 and the width of the insulating sealing sleeve 40 together, the width of the insulating sealing sleeve 40 cannot be less than the width of the first tab 20, so as to ensure that the insulating sealing sleeve 40 can completely wrap the first overlap area 50, thereby effectively preventing the foil from being exposed, effectively avoiding the burr on the foil from piercing the aluminum plastic film and causing the battery to short circuit, and also effectively preventing the edges of the first tab 20 or the edges of the second tab 30 from being exposed when the cell 100 is folded, further improving the safety performance of the battery.
[0053] Therefore, the width b of the first tab 20 and the width of the insulating sealing sleeve 40 satisfy the relationship a:b = 1:(1.1-1.4), which can effectively ensure that the width of the insulating sealing sleeve 40 is not less than the width of the first tab 20, and can completely wrap the first overlap area 50, thereby playing an insulating protection role on the first overlap area 50.
[0054] Further, a:b = 1:1.1, 1:1.11, 1:1.15, 1:1.17, 1:1.19, 1:1.2, 1:1.21, 1:1.24, 1:1.25, 1:1.28, 1:1.3, 1:1.32, 1:1.35, 1:1.36, 1:1.39 or 1:1.4. But not limited to the listed values, other values within the value range are also applicable.
[0055] Referring to Figs. 6-7 , and In some embodiments, the insulating sealing sleeve 40 is polypropylene (PP), and the insulating sealing sleeve 40 comprises a first polypropylene layer and a second polypropylene layer, and the first tab 20 and part of the second tab 30 are arranged between the first polypropylene layer and the second polypropylene layer. The first polypropylene layer and the second polypropylene layer can be integrally formed, i.e., the first polypropylene layer and the second polypropylene layer are one component; or the first polypropylene layer and the second polypropylene layer can be a split structure, i.e., the first polypropylene layer and the second polypropylene layer are two separate components.
[0056] When the first polypropylene layer and the second polypropylene layer are integrally formed, the first polypropylene layer and the second polypropylene layer are one whole component before heat shrinking or heat pressing. During the heat shrinking or heat pressing process, the first polypropylene layer and the second polypropylene layer will be closely attached to form the insulating sealing sleeve 40. When the first polypropylene layer and the second polypropylene layer are a split structure, the first polypropylene layer and the second polypropylene layer need to be connected during the heat shrinking or heat pressing process to form the insulating sealing sleeve 40.
[0057] Further, when the first polypropylene layer and the second polypropylene layer are both one layer, the thickness of the first polypropylene layer and the thickness of the second polypropylene layer are both 10-200 μm. Specifically, the thickness of the first polypropylene layer and the thickness of the second polypropylene layer are both 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm, or 200 μm. However, the values listed are not limiting, and other values within the range are also applicable.
[0058] When the first polypropylene layer and the second polypropylene layer are both multi-layered, the thickness of each layer of the first polypropylene layer and the thickness of each layer of the second polypropylene layer are both 1-50 μm. Specifically, the thickness of each layer of the first polypropylene layer and the thickness of each layer of the second polypropylene layer are both 1 μm, 3 μm, 5 μm, 6 μm, 8 μm, 10 μm, 11 μm, 12 μm, 15 μm, 17 μm, 19 μm, 20 μm, 22 μm, 25 μm, 27 μm, 28 μm, 30 μm, 31 μm, 33 μm, 35 μm, 36 μm, 40 μm, 42 μm, 45 μm, 47 μm, 49 μm, or 50 μm. However, the values listed are not limiting, and other values within the range are also applicable.
[0059] In some embodiments, the insulation sealing sleeve 40 has a melting point of 90-165°C. By setting the melting point of the insulation sealing sleeve 40 to be 90-165°C, which is generally lower than the high temperature that can be reached inside the battery cell 100 due to a short circuit, the insulation sealing sleeve 40 can quickly respond when a short circuit occurs inside the battery, reach the melting point and start to melt. With the melting of the insulation sealing sleeve 40, the pressure inside the battery can be quickly released, thereby avoiding serious consequences such as battery rupture or explosion due to excessive internal pressure.
[0060] It is apparent for a person skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, the scope of the present application being defined by the appended claims rather than the above description, and it is intended to embrace all changes and modifications that fall within the meaning and scope of equivalents of the claims.
Claims
1. An electric cell, characterized by: The battery cell includes a cell body (10) and a first tab (20), the cell body (10) is provided with a second tab (30), the first tab (20) is electrically connected with the second tab (30), the second tab (30) is provided with an insulating sealing sleeve (40), and the insulating sealing sleeve (40) at least covers a first overlapping area (50) of the first tab (20) and the second tab (30).
2. The cell of claim 1, wherein: The insulating sealing sleeve (40) covers the second tab (30).
3. The cell of claim 1, wherein: The first tab (20) has a second overlapping area (21) for overlapping with an aluminum plastic film, the insulating sealing sleeve (40) has a first area (41) and a second area (42), the first area (41) and the second area (42) are connected, the first area (41) covers the second tab (30), and the second area (42) covers the second overlapping area (21).
4. The cell of claim 3, wherein: The first tab (20) further has a bending area (22) and an exposed area (23) for extending out of the aluminum plastic film, the bending area (22) is arranged between the first overlapping area (50) and the second overlapping area (21), and the second area (42) further covers the bending area (22) and part of the exposed area (23).
5. The cell of claim 4, wherein: The bending area (22) is provided with a first through hole (221), the second area (42) is provided with a second through hole (421), and the first through hole (221) and the second through hole (421) are in position correspondence.
6. The cell of claim 1, wherein: The second tab (30) is provided in plurality, and along a thickness direction (k) of the cell body (10), the plurality of second tabs (30) are arranged in stack and form a tab group, the first tab (20) is provided with at least one third through hole (24), one end of the tab group passes through the third through hole (24) and is electrically connected with the other end of the tab group, and the insulating sealing sleeve (40) covers the tab group.
7. The cell of claim 1, wherein: Along the thickness direction (k) of the cell body (10), lengths (c) of the plurality of second tabs (30) are sequentially increased.
8. The cell of claim 1, wherein: A width of the first tab (20) and a width of the insulating sealing sleeve (40) satisfy a relationship of a:b=1:(1.1~1.4), wherein a is the width of the insulating sealing sleeve (40), and b is the width of the first tab (20).
9. A battery, characterized by: The battery cell includes an aluminum plastic film and the battery cell (100) of any one of claims 1-8, the aluminum plastic film is provided with a receiving cavity, the battery cell (100) is arranged in the receiving cavity, and the first tab (20) partially extends out of the aluminum plastic film.
10. An electrical device, characterized by: The battery includes the battery cell of claim 9.