Battery cell, insulating member, and electric device

Abstract

The present application provides a battery cell, an insulating member, and an electric device. The battery cell comprises an electrode assembly, a first electrical connector, and a first insulating member. The electrode assembly comprises first electrode sheets, second electrode sheets, and separators. The first electrode sheets and the second electrode sheets have opposite polarities, the first electrode sheets and the second electrode sheets are stacked, and the separators are respectively arranged between the first electrode sheets and the second electrode sheets. The first electrode sheets each have a first empty foil region, and the first electrical connector is connected to the first empty foil region to form a first connection region. The first insulating member is annularly arranged, and the first insulating member wraps at least part of the first connection region. The first connection region is insulated form the second electrode sheets by means of the first insulating member, so that when the battery cell is subjected to an external force or falls, the possibility of short circuit caused by contact between the first connection region and the second electrode sheets is low, the safety of the battery cell is high, and the possibility that the first insulating member, after being soaked in an electrolyte, is separated from the first connection region is low.

Description

Battery cell, insulating piece and electric device Cross-reference to Related Applications

[0001] This application claims priority to Chinese Patent Application CN202410841869.2 entitled "Battery cell, insulating piece and electric device" filed on June 26, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, in particular to a battery cell, an insulating piece and an electric device. BACKGROUND

[0003] With the rapid development of electronic information technology, various electronic devices are also developing towards intelligence and multifunction, and the safety requirements for batteries are also becoming higher and higher.

[0004] At present, the tab of the battery cell may shake in the left-right direction or the up-down direction during the falling process, which may cause the tab to contact the tab of the other polarity and generate a short circuit, thereby affecting the safety of the battery cell. SUMMARY

[0005] The present application provides a battery cell, an insulating piece and an electric device, which can improve the safety of the battery cell.

[0006] In a first aspect, the present application provides a battery cell, comprising an electrode assembly, a first electrical connecting piece and a first insulating piece, the electrode assembly comprising a first tab, a second tab and a separator, the first tab and the second tab having opposite polarities, the first tab and the second tab being stacked, and the separator being arranged between the first tab and the second tab; the first tab having a first empty foil area; the first electrical connecting piece being connected to the first empty foil area and forming a first connecting area; and the first insulating piece being annularly arranged and wrapping at least part of the first connecting area.

[0007] In the above technical solution, the first insulating piece wraps at least part of the first connecting area, which can reduce the possibility of the first connecting area contacting the second tab and causing a short circuit when the battery cell is subjected to an external force or falls and shakes in the left-right direction or the up-down direction, thereby improving the safety of the battery cell; the first insulating piece is annularly arranged, which can reduce the possibility of the first insulating piece separating from the first connecting area after being soaked in electrolyte, thereby allowing the first insulating piece to maintain insulation of the first connecting area and the second tab, further reducing the possibility of the first connecting area contacting the second tab and causing a short circuit, and improving the safety of the battery cell.

[0008] In some embodiments of the present application, the first insulating piece includes a first insulating portion, a second insulating portion, a third insulating portion and a fourth insulating portion, the first insulating portion and the second insulating portion are respectively arranged on two sides of the first connecting area in the first direction, the third insulating portion and the fourth insulating portion are respectively arranged on two sides of the first connecting area in the second direction; the third insulating portion connects the first insulating portion and the second insulating portion, and the fourth insulating portion connects the first insulating portion and the second insulating portion; the first direction is perpendicular to the second direction.

[0009] In the above technical solution, by arranging the first insulating portion and the second insulating portion on two sides of the first connecting area in the first direction respectively, and connecting the first insulating portion and the second insulating portion by the third insulating portion and the fourth insulating portion, the first insulating piece can wrap the first connecting area on both sides of the first connecting area in the first direction and on both sides of the first connecting area in the second direction, reducing the possibility of short circuit between the first connecting area and the second tab, and making the safety of the battery cell higher. Moreover, the first insulating piece completely wraps around the first connecting area, reducing the possibility of the first insulating piece falling off.

[0010] In some embodiments of the present application, the thickness of the first insulating portion is H1, and H1≥10μm is satisfied; and / or, the thickness of the second insulating portion is H2, and H2≥10μm is satisfied.

[0011] In the above technical solution, by making the thickness H1 of the first insulating portion satisfy H1≥10μm, the burrs on the first connecting area and / or the second tab are less likely to pass through the first insulating portion to contact and short circuit each other, so that the first insulating portion has a better insulation effect on the first connecting area and the second tab, and the safety of the battery cell is higher.

[0012] By making the thickness H2 of the second insulating portion satisfy H2≥10μm, the burrs on the first connecting area and / or the second tab are less likely to pass through the second insulating portion to contact and short circuit each other, so that the second insulating portion has a better insulation effect on the first connecting area and the second tab, and the safety of the battery cell is higher.

[0013] In some embodiments of the present application, the first insulating piece is made of heat-shrinkable material.

[0014] In the above technical solution, by making the first insulating piece be made of heat-shrinkable material, after the first insulating piece wraps the first connecting area, the first insulating piece can shrink under heat to be fixed to the first connecting area, and the possibility of the first insulating piece being separated from the first connecting area after being stressed or soaked in electrolyte is further smaller, so that the first insulating piece can further maintain the insulation on the first connecting area and the second tab, and the possibility of short circuit between the first connecting area and the second tab is further reduced, making the safety of the battery cell higher.

[0015] In some embodiments of the application, the battery cell includes a packaging bag and a first sealing member, the packaging bag includes a main body portion and an edge portion, the electrode assembly is accommodated in the main body portion, the first electrical connector extends out of the packaging bag from the edge portion along a third direction, and the first sealing member is arranged between the edge portion and the first electrical connector; along the third direction, the first insulating member is spaced apart from the first sealing member by a distance D, and 0 < D < 0.2 mm is satisfied.

[0016] In the above technical solution, when the distance D between the first insulating member and the first sealing member along the third direction satisfies D > 0, the possibility of interference between the first insulating member and the first sealing member is small, and the assembly of the electrode assembly, the packaging bag and the first sealing member is facilitated; when the distance D between the first insulating member and the first sealing member along the third direction satisfies D < 0.2 mm, the first sealing member can limit the first insulating member in the third direction, the possibility of separation of the first insulating member from the first connecting area is reduced, the first insulating member can maintain insulation of the first connecting area and the second tab, the possibility of contact short circuit between the first connecting area and the second tab is further reduced, and the safety of the battery cell is higher; therefore, when the distance D between the first insulating member and the first sealing member along the third direction satisfies 0 < D < 0.2 mm, the possibility of interference between the first insulating member and the first sealing member is small, the assembly of the electrode assembly, the packaging bag and the first sealing member is facilitated, the first sealing member can limit the first insulating member in the third direction, the possibility of separation of the first insulating member from the first connecting area is reduced, the first insulating member can maintain insulation of the first connecting area and the second tab, the possibility of contact short circuit between the first connecting area and the second tab is further reduced, and the safety of the battery cell is higher.

[0017] In some embodiments of the application, the first tab has a first coated area, the first empty foil areas of the plurality of first tabs are gathered to form a gathered portion, the gathered portion includes a first segment and a second segment, the first segment is connected with the first coated area, the second segment is bent relative to the first segment, and the second segment is connected with the first electrical connector; and the first insulating member wraps the entire second segment.

[0018] In the above technical solution, since the first coated area is limited by the packaging bag, the possibility of displacement relative to the second tab is small, the first segment of the gathered portion is connected with the first coated area, when the battery cell is stressed, the possibility of shaking of the first segment relative to the second tab is small, and the second segment of the gathered portion is away from the first coated area relative to the first segment, and the second segment can shake relative to the second tab; by wrapping the entire second segment with the first insulating member, the possibility of contact short circuit between the second segment and the second tab is reduced, and the safety of the battery cell is higher.

[0019] In some embodiments of the application, the electrode assembly is a laminated structure, and the electrode assembly comprises a plurality of first electrode sheets, a plurality of second electrode sheets, and a plurality of separators, the plurality of first electrode sheets and the plurality of second electrode sheets are stacked along a first direction, and the plurality of separators are respectively arranged between the first electrode sheets and the second electrode sheets; each second electrode sheet has a first notch, and a first empty foil area at least partially overlaps the first notch along the first direction.

[0020] In the above technical solution, by making each second electrode sheet have a first notch, and a first empty foil area at least partially overlaps the first notch along the first direction, the volume of the first empty foil area protruding out of the electrode assembly along the third direction can be reduced, so that the spacing space reserved between the electrode assembly and the shell for accommodating the first empty foil area is smaller, which is beneficial to improve the energy density of the battery cell, and when the battery cell is subjected to an external force, the possibility of the electrode assembly shaking relative to the shell is smaller, and the possibility of the first empty foil area contacting the second electrode sheet and short-circuiting is also smaller, which can reduce the risk of thermal runaway of the battery cell.

[0021] In some embodiments of the application, the first notch has a first edge and a second edge, the first edge is connected with the second edge, and the first empty foil area exceeds the first edge along the third direction; a part of the first insulating piece is located between the first connecting area and the second edge along the second direction; the first direction, the second direction, and the third direction are perpendicular to each other.

[0022] In the above technical solution, the first empty foil area exceeds the first edge along the third direction, and a part of the first insulating piece is located between the first connecting area and the second edge along the second direction, so that the first insulating piece can realize insulation between the first empty foil area and the first edge in the second direction, and the possibility of the first empty foil area contacting the second electrode sheet and short-circuiting when the battery cell is subjected to an external force or falls is lower, so that the safety of the battery cell is higher.

[0023] In some embodiments of the application, the first insulating piece exceeds the second edge away from the first edge along the third direction.

[0024] In the above technical solution, by making the first insulating piece exceed the second edge away from the first edge along the third direction, the projection of the first insulating piece on the second direction can cover the end of the second edge away from the first edge, so that the insulation effect of the first insulating piece on the first empty foil area and the second electrode sheet in the second direction is better, which can further reduce the possibility of the first empty foil area contacting the second electrode sheet and short-circuiting when the battery cell is subjected to an external force or falls, and further improve the safety of the battery cell.

[0025] In some embodiments of the application, the first notch further has a third edge, the third edge is spaced apart from the second edge along the second direction, and the first edge connects the second edge and the third edge; a part of the first insulating piece is located between the first connecting area and the third edge along the second direction.

[0026] In the technical solution, along the second direction, the part of the first insulating member is located between the first connecting area and the third edge, so that the first insulating member can realize insulation between the first empty foil area and the third edge in the second direction, and the possibility of short circuit between the first empty foil area and the second tab when the battery cell is subjected to external force or falls is low, so that the safety of the battery cell is high.

[0027] In some embodiments of the present application, the first empty foil area is located at a first angle position of the first tab, and the first notch is located at a second angle position of the second tab.

[0028] In the technical solution, by locating the first empty foil area at the first angle position of the first tab and locating the first notch at the second angle position of the second tab, the preparation of the first notch and the first empty foil area is facilitated, and the leading-out of the first empty foil area is facilitated.

[0029] In some embodiments of the present application, each second tab has a second empty foil area, each first tab has a second notch, along the first direction, the second empty foil area at least partially overlaps the second notch; the battery cell comprises a second electric connecting member and a second insulating member, the second electric connecting member is connected with the second empty foil area and forms a second connecting area, and the second insulating member is annularly arranged and wraps the second connecting area.

[0030] In the technical solution, each second tab has a second empty foil area, each first tab has a second notch, along the first direction, the second empty foil area at least partially overlaps the second notch, which can reduce the volume of the second empty foil area protruding from the electrode assembly, so that the spacing space reserved between the electrode assembly and the shell for accommodating the second empty foil area is small, which is beneficial to improve the energy density of the battery cell, and when the battery cell is subjected to external force, the possibility of the electrode assembly shaking relative to the shell is small, and the possibility of the second empty foil area contacting and short-circuiting with the first tab is also small, which can reduce the risk of thermal runaway of the battery cell; the battery cell comprises a second electric connecting member and a second insulating member, the second electric connecting member is connected with the second empty foil area and forms a second connecting area, and the second insulating member is annularly arranged and wraps the second connecting area, which can reduce the possibility of the second insulating member separating from the second connecting area after being soaked in electrolyte, so that the second insulating member can maintain insulation of the second connecting area and the first tab, further reducing the possibility of short circuit between the second connecting area and the first tab, so that the safety of the battery cell is higher.

[0031] In a second aspect, the present application provides an insulating member, which is annularly arranged and is made of heat-shrinkable material, and is used for insulation of an empty foil area of a battery cell.

[0032] In the technical solution, the insulating piece is arranged in the empty foil area of the battery cell, so that the empty foil area and the pole piece are insulated, the possibility of short circuit between the empty foil area and the pole piece is low when the battery cell is subjected to external force or falls, the safety of the battery cell is high, the insulating piece does not increase the thickness of the electrode assembly, and the energy density of the battery cell is improved; the insulating piece is annular, so that the possibility of separation between the insulating piece and the empty foil area after the insulating piece is soaked in the electrolyte is low, so that the insulating piece can maintain the insulation of the empty foil area and the pole piece, the possibility of short circuit between the empty foil area and the pole piece is further reduced, and the safety of the battery cell is higher.

[0033] In a third aspect, the present application provides a power utilization device, comprising the battery cell as described above, and the battery cell is used to provide electric energy. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained from these drawings.

[0035] Fig. 1 is a perspective structural schematic view of a battery cell provided by some embodiments of the present application;

[0036] Fig. 2 is a perspective schematic view of a partial structure of a battery cell provided by some embodiments of the present application;

[0037] Fig. 3 is an exploded schematic view of a partial structure of a battery cell provided by some embodiments of the present application;

[0038] Fig. 4 is an exploded schematic view of a partial structure of a battery cell provided by some embodiments of the present application;

[0039] Fig. 5 is a perspective structural schematic view of a first insulating piece of a battery cell provided by some embodiments of the present application;

[0040] Fig. 6 is a structural schematic view of one perspective of a first insulating piece of a battery cell provided by some embodiments of the present application;

[0041] Fig. 7 is a sectional structural schematic view of a battery cell provided by some embodiments of the present application;

[0042] Fig. 8 is a local enlarged structural schematic view of A of the battery cell in Fig. 7;

[0043] Fig. 9 is a structural schematic view of a first pole piece of a battery cell provided by some embodiments of the present application;

[0044] Fig. 10 is a structural schematic view of a second pole piece of a battery cell provided by some embodiments of the present application;

[0045] FIG. 11 is a structural schematic diagram of a separator of an electric core according to some embodiments of the present application;

[0046] FIG. 12 is a schematic diagram of a partial structure of an electric core according to some embodiments of the present application;

[0047] FIG. 13 is a structural schematic diagram of a second tab of an electric core according to some embodiments of the present application;

[0048] FIG. 14 is a schematic diagram of a partial structure of an electric core according to some embodiments of the present application.

[0049] FIG. 11 is a structural schematic diagram of a separator of an electric core according to some embodiments of the present application;

[0050] For the purpose of clarity, technical solutions in the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art belong to the scope of protection of the present application.

[0051] Unless otherwise defined, all technical and scientific terms used in the present application have the same meanings as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0052] The terms "first", "second" and the like in the specification of the present application are used to distinguish different objects, rather than to describe a particular order or primary and secondary relationships.

[0053] Reference to an "embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another.

[0054] In embodiments of the application, the same reference numbers are used throughout the drawings to represent the same or similar components. Detailed descriptions of well-known

[0055] Batteries have the advantages of high energy density, small environmental pollution, large power density, long service life, wide adaptability, small self-discharge coefficient, etc., and are an important part of the development of new energy today. With the development of the new energy industry, batteries are gradually developing towards high energy density and high power density. The internal structure of the battery is more compact, and it is more prone to short circuit risk.

[0056] At present, the tab of the battery cell is generally insulated from the polar plate with opposite polarity by attaching adhesive tape. However, after the battery cell is assembled, electrolyte is injected into the battery cell. As the soaking time of the adhesive tape in the electrolyte increases, the adhesion of the adhesive tape gradually decreases, making it more likely for the adhesive tape to separate from the tab, thereby affecting the safety of the battery cell.

[0057] To improve the safety of the battery cell, the application provides a battery cell, which includes an electrode assembly, a first electrical connecting member, and a first insulating member. The electrode assembly includes a first polar plate, a second polar plate, and a separator. The first polar plate and the second polar plate have opposite polarities. The first polar plate and the second polar plate are stacked. The separator is arranged between the first polar plate and the second polar plate. The first polar plate has a first empty foil area. The first electrical connecting member is connected to the first empty foil area and forms a first connecting area. The first insulating member is annularly arranged and wraps at least part of the first connecting area.

[0058] In the battery cell with such a structure, the first insulating member wraps at least part of the first connecting area, which makes it less likely for the first connecting area to contact and short circuit with the second polar plate when the battery cell is shaken in the left-right direction or the up-down direction due to external force or falling. This makes the battery cell safer. The first insulating member is annularly arranged, which makes it less likely for the first insulating member to separate from the first connecting area after being soaked in electrolyte, so that the first insulating member can maintain insulation of the first connecting area and the second polar plate, further reducing the possibility of the first connecting area contacting and short circuiting with the second polar plate, and making the battery cell safer.

[0059] The electric core provided by the embodiments of the present application can be a secondary battery or a primary battery, for example, a lithium ion battery, a sodium ion battery, a magnesium ion battery, etc. The embodiments of the present application are not limited in this regard.

[0060] The embodiments of the present application provide a power consumption device using the electric core as a power supply. The power consumption device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft, etc.

[0061] Referring to FIGS. 1-3, FIG. 1 is a perspective structural schematic diagram of an electric core according to some embodiments of the present application; FIG. 2 is a perspective schematic diagram of a partial structure of the electric core according to some embodiments of the present application; and FIG. 3 is an exploded schematic diagram of a partial structure of the electric core according to some embodiments of the present application.

[0062] The embodiments of the present application provide an electric core 10, which includes an electrode assembly 100, a first electric connecting member 210, and a first insulating member 310. The electrode assembly 100 includes a first electrode tab 110, a second electrode tab 120, and a separator 130. The first electrode tab 110 and the second electrode tab 120 have opposite polarities. The first electrode tab 110 and the second electrode tab 120 are stacked. The separator 130 is arranged between the first electrode tab 110 and the second electrode tab 120.

[0063] In some embodiments, the electric core 10 is in a cuboid shape, and the top corner is in a rounded corner shape, which can better adapt to a rounded battery compartment in a power consumption device.

[0064] In other embodiments, the top corner of the electric core 10 can also be in a square corner shape.

[0065] Referring to FIG. 4, FIG. 4 is an exploded schematic diagram of a partial structure of the electric core according to some embodiments of the present application.

[0066] In some embodiments, the first electrode tab 110 has a first empty foil area 111. The first electric connecting member 210 is connected to the first empty foil area 111 and forms a first connecting area. The first insulating member 310 is in a ring shape, and the first insulating member 310 wraps at least part of the first connecting area.

[0067] By wrapping the first insulation member 310 around at least part of the first connection region, when the battery cell 10 is subjected to an external force or falls and causes the first connection region to shake in the left-right direction or the up-down direction, the possibility of the first connection region being in contact with the second tab 120 to cause a short circuit is low, and the safety of the battery cell 10 is high. The first insulation member 310 is arranged in a ring shape, and the possibility of the first insulation member 310 being separated from the first connection region after being soaked in the electrolyte is low, so that the first insulation member 310 can maintain insulation of the first connection region and the second tab 120, further reducing the possibility of the first connection region being in contact with the second tab 120 to cause a short circuit, and the safety of the battery cell 10 is higher.

[0068] In some embodiments, the first tab 110 has a first coating region 112, and the first insulation member 310 does not overlap the first coating region 112 in the thickness direction of the electrode assembly, so that the first insulation member 310 does not increase the thickness of the electrode assembly 100, which is beneficial to improve the energy density of the battery cell 10.

[0069] Referring to FIGS. 5 and 6, FIG. 5 is a perspective view of a first insulation member of a battery cell according to some embodiments of the present application, and FIG. 6 is a view of a structure of the first insulation member of the battery cell according to some embodiments of the present application.

[0070] In some embodiments, the first insulation member 310 includes a first insulation portion 311, a second insulation portion 312, a third insulation portion 313, and a fourth insulation portion 314. The first insulation portion 311 and the second insulation portion 312 are respectively arranged on both sides of the first connection region in the first direction X, and the third insulation portion 313 and the fourth insulation portion 314 are respectively arranged on both sides of the first connection region in the second direction Y. The third insulation portion 313 connects the first insulation portion 311 and the second insulation portion 312, and the fourth insulation portion 314 connects the first insulation portion 311 and the second insulation portion 312. The first direction X is perpendicular to the second direction Y.

[0071] By arranging the first insulation portion 311 and the second insulation portion 312 on both sides of the first connection region in the first direction X, respectively, and connecting the first insulation portion 311 and the second insulation portion 312 by the third insulation portion 313 and the fourth insulation portion 314, the first insulation member 310 can wrap the first connection region on both sides of the first connection region in the first direction X and on both sides of the first connection region in the second direction Y, reducing the possibility of the first connection region being in contact with the second tab 120 to cause a short circuit, and the safety of the battery cell 10 is higher. Moreover, the first insulation member 310 completely wraps around the first connection region, reducing the possibility of the first insulation member 310 falling off.

[0072] In some embodiments, the first insulation part 311 has a thickness H1 satisfying H1≥10 μm. For example, H1 can be 10 μm, 12 μm, 15 μm, 17 μm, 18 μm, or 20 μm, etc.

[0073] By making the thickness H1 of the first insulation part 311 satisfy H1≥10 μm, the first connecting area and / or the burr on the second tab 120 are less likely to contact each other through the first insulation part 311 to cause short circuit, so that the first insulation part 311 has better insulation effect on the first connecting area and the second tab 120, and the safety of the battery cell 10 is higher.

[0074] In some embodiments, the second insulation part 312 has a thickness H2 satisfying H2≥10 μm. For example, H2 can be 10 μm, 12 μm, 15 μm, 17 μm, 18 μm, or 20 μm, etc.

[0075] By making the thickness H2 of the second insulation part 312 satisfy H2≥10 μm, the first connecting area and / or the burr on the second tab 120 are less likely to contact each other through the second insulation part 312 to cause short circuit, so that the second insulation part 312 has better insulation effect on the first connecting area and the second tab 120, and the safety of the battery cell 10 is higher.

[0076] In some embodiments, the third insulation part 313 has a thickness H3 satisfying H3≥10 μm. For example, H3 can be 10 μm, 12 μm, 15 μm, 17 μm, 18 μm, or 20 μm, etc.

[0077] By making the thickness H3 of the third insulation part 313 satisfy H3≥10 μm, the first connecting area and / or the burr on the second tab 120 are less likely to contact each other through the third insulation part 313 to cause short circuit, so that the third insulation part 313 has better insulation effect on the first connecting area and the second tab 120, and the safety of the battery cell 10 is higher.

[0078] In some embodiments, the fourth insulation part 314 has a thickness H4 satisfying H4≥10 μm. For example, H4 can be 10 μm, 12 μm, 15 μm, 17 μm, 18 μm, or 20 μm, etc.

[0079] By making the thickness H4 of the fourth insulation part 314 satisfy H4≥10 μm, the first connecting area and / or the burr on the second tab 120 are less likely to contact each other through the fourth insulation part 314 to cause short circuit, so that the fourth insulation part 314 has better insulation effect on the first connecting area and the second tab 120, and the safety of the battery cell 10 is higher.

[0080] In some embodiments, H3>H1, H3>H2, H3>H4. For example, H3may be 1.1*H1, 1.3*H1 or 1.5*H1, etc., H3may be 1.1*H2, 1.3*H2 or 1.5*H2, etc., H3may be 1.1*H4, 1.3*H4 or 1.5*H4, etc.

[0081] By making H3>H1, H3>H2, H3>H4, it is further possible to make the burrs on the first connecting area and / or the second tab 120 not easily contact each other and short circuit through the third insulating part 313 in the second direction Y, so that the third insulating part 313 has a better insulation effect on the first connecting area and the second tab 120, and the safety of the battery cell 10 is higher.

[0082] In some embodiments, the first insulating part 310 is made of heat-shrinkable material.

[0083] By making the first insulating part 310 made of heat-shrinkable material, after the first insulating part 310 wraps the first connecting area, the first insulating part 310 can shrink under heat, which generally refers to the material starting to shrink when the temperature reaches 70°C or above, so as to be fixed on the first connecting area. It is further possible to make the possibility of the first insulating part 310 being separated from the first connecting area after being stressed or soaked in electrolyte smaller, so as to further make the first insulating part 310 maintain insulation on the first connecting area and the second tab 120, further reduce the possibility of the first connecting area contacting and short circuiting with the second tab 120, and make the safety of the battery cell 10 higher.

[0084] In some embodiments, the first insulating part 310 is made of at least one of thermoplastic polyolefin, silicone rubber, polytetrafluoroethylene, polyvinyl chloride, polyolefin, and polyethylene terephthalate.

[0085] By making the first insulating part 310 made of at least one of thermoplastic polyolefin, silicone rubber, polytetrafluoroethylene, polyvinyl chloride, polyolefin, and polyethylene terephthalate, it is possible to make the heat-shrinking effect of the first insulating part 310 better, further make the possibility of the first insulating part 310 being separated from the first connecting area after being stressed or soaked in electrolyte smaller, so as to further make the first insulating part 310 maintain insulation on the first connecting area and the second tab 120, further reduce the possibility of the first connecting area contacting and short circuiting with the second tab 120, and make the safety of the battery cell 10 higher.

[0086] Referring to FIG. 1, FIG. 7 and FIG. 8, FIG. 7 is a cross-sectional structure schematic view of a battery cell provided in some embodiments of the present application; and FIG. 8 is a partial enlarged structure schematic view of the battery cell at position A in FIG. 7.

[0087] In some embodiments, the battery cell 10 comprises a packaging bag 400 and a first sealing member 510, the packaging bag 400 comprises a main body part 410 and an edge part 420, the electrode assembly 100 is accommodated in the main body part 410, the first electrical connecting member 210 extends out of the packaging bag 400 from the edge part 420 along the third direction Z, and the first sealing member 510 is arranged between the edge part 420 and the first electrical connecting member 210.

[0088] In some embodiments, along the third direction Z, the interval distance D between the first insulating member 310 and the first sealing member 510 satisfies 0 < D < 0.2 mm. For example, D can be 0.05 mm, 0.1 mm or 0.2 mm, etc.

[0089] When along the third direction Z, the interval distance D between the first insulating member 310 and the first sealing member 510 satisfies D > 0, the possibility of interference between the first insulating member 310 and the first sealing member 510 is small, which facilitates the assembly of the electrode assembly 100, the packaging bag 400 and the first sealing member 510; when along the third direction Z, the interval distance D between the first insulating member 310 and the first sealing member 510 satisfies D < 0.2 mm, the first sealing member 510 can limit the first insulating member 310 in the third direction Z, reducing the possibility of separation of the first insulating member 310 from the first connecting area, so that the first insulating member 310 can maintain insulation to the first connecting area and the second tab 120, further reducing the possibility of contact short circuit between the first connecting area and the second tab 120, so that the safety of the battery cell 10 is higher; therefore, when along the third direction Z, the interval distance D between the first insulating member 310 and the first sealing member 510 satisfies 0 < D < 0.2 mm, the possibility of interference between the first insulating member 310 and the first sealing member 510 is small, which facilitates the assembly of the electrode assembly 100, the packaging bag 400 and the first sealing member 510, and the first sealing member 510 can limit the first insulating member 310 in the third direction Z, reducing the possibility of separation of the first insulating member 310 from the first connecting area, so that the first insulating member 310 can maintain insulation to the first connecting area and the second tab 120, further reducing the possibility of contact short circuit between the first connecting area and the second tab 120, so that the safety of the battery cell 10 is higher.

[0090] Referring to FIG. 4 and FIG. 9, FIG. 9 is a structural schematic view of the first tab of the battery cell provided in some embodiments of the present application.

[0091] In some embodiments, the first tab 110 has a first coating area 112, the first empty foil area 111 of the plurality of first tabs 110 is folded to form a folded part 101, the folded part 101 includes a first section 1011 and a second section 1012, the first section 1011 is connected with the first coating area 112, the second section 1012 is bent relative to the first section 1011, and the second section 1012 is connected with the first electrical connector 210. The first insulating member 310 wraps the entire second section 1012.

[0092] Since the first coating area 112 is limited by the packaging bag 400, the possibility of displacement relative to the second tab 120 is small, the first section 1011 of the folded part 101 is connected with the first coating area 112, when the battery cell 10 is under stress, the possibility of the first section 1011 shaking relative to the second tab 120 is small, and the second section 1012 of the folded part 101 is away from the first coating area 112 relative to the first section 1011, the second section 1012 can shake relative to the second tab 120. By wrapping the entire second section 1012 with the first insulating member 310, the possibility of short circuit between the second section 1012 and the second tab 120 can be reduced, and the safety of the battery cell 10 is higher.

[0093] Referring to FIGS. 2, 3, 9 and 10, FIG. 10 is a structural schematic view of a second tab of a battery cell according to some embodiments of the present application.

[0094] In some embodiments, the electrode assembly 100 has a laminated structure, and the electrode assembly 100 includes a plurality of first tabs 110, a plurality of second tabs 120, and a plurality of separators 130. The plurality of first tabs 110 and the plurality of second tabs 120 are stacked along a first direction X, and the plurality of separators 130 are respectively arranged between the first tabs 110 and the second tabs 120.

[0095] In some embodiments, each second tab 120 has a first notch 121, and the first empty foil area 111 at least partially overlaps the first notch 121 along the first direction X.

[0096] By providing each second tab 120 with a first notch 121, and the first empty foil area 111 at least partially overlaps the first notch 121 along the first direction X, the volume of the first empty foil area 111 protruding out of the electrode assembly 100 along the third direction Z can be reduced, the spacing space reserved between the electrode assembly 100 and the shell for accommodating the first empty foil area 111 is smaller, which is beneficial to improve the energy density of the battery cell 10, and when the battery cell 10 is under external force, the electrode assembly 100 is less likely to shake relative to the shell, and the first empty foil area 111 is less likely to contact and short circuit with the second tab 120, which can reduce the risk of thermal runaway of the battery cell 10.

[0097] In some embodiments, the first gap 121 has a first edge 1211 and a second edge 1212, the first edge 1211 is connected with the second edge 1212, and the first empty foil area 111 is beyond the first edge 1211 along the third direction Z. A part of the first insulating piece 310 is between the first connecting area and the second edge 1212 along the second direction Y. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0098] By making the first empty foil area 111 beyond the first edge 1211 along the third direction Z and making a part of the first insulating piece 310 between the first connecting area and the second edge 1212 along the second direction Y, the first insulating piece 310 can realize insulation between the first empty foil area 111 and the first edge 1211 along the second direction Y, and the possibility of short circuit between the first empty foil area 111 and the second tab 120 when the battery cell 10 is subjected to external force or falls is low, so that the safety of the battery cell 10 is high.

[0099] Referring to FIGS. 7 and 8, in some embodiments, the first insulating piece 310 is beyond the second edge 1212 away from the first edge 1211 along the third direction Z.

[0100] By making the first insulating piece 310 beyond the second edge 1212 away from the first edge 1211 along the third direction Z, the projection of the first insulating piece 310 on the second direction Y can cover the end of the second edge 1212 away from the first edge 1211, so that the first insulating piece 310 has better insulation effect between the first empty foil area 111 and the second tab 120 along the second direction Y, and the possibility of short circuit between the first empty foil area 111 and the second tab 120 when the battery cell 10 is subjected to external force or falls is low, so that the safety of the battery cell 10 is high.

[0101] In some embodiments, the first empty foil area 111 is located at a first corner position of the first tab 110, and the first gap 121 is located at a second corner position of the second tab 120.

[0102] By making the first empty foil area 111 located at the first corner position of the first tab 110 and the first gap 121 located at the second corner position of the second tab 120, the preparation of the first gap 121 and the first empty foil area 111 can be facilitated, and the leading-out of the first empty foil area 111 can be facilitated.

[0103] The corner position in the present application refers to the position at the top corner of the tab.

[0104] In some embodiments, the first corner position and the second corner position are two adjacent corner positions of the first tab 110.

[0105] By making the first angle position and the second angle position two adjacent angle positions of the first pole piece 110, the first empty foil area 111 and the second empty foil area 122 can be led out from the same end of the electrode assembly 100, which facilitates the electrical connection between the battery cell 10 and the external device through the first empty foil area 111 and the second empty foil area 122.

[0106] In other embodiments, the first angle position and the second angle position can be two opposite angle positions of the first pole piece 110. This can be applicable to the structure in which the first empty foil area 111 and the second empty foil area 122 are led out from opposite ends of the battery cell 10.

[0107] Referring to FIGS. 2, 3, 9 and 10, in some embodiments, each second pole piece 120 has a second empty foil area 122, and each first pole piece 110 has a second notch 113, and the second empty foil area 122 and the second notch 113 at least partially overlap in the first direction X.

[0108] By making each second pole piece 120 have a second empty foil area 122, and each first pole piece 110 have a second notch 113, and the second empty foil area 122 and the second notch 113 at least partially overlap in the first direction X, the volume of the second empty foil area 122 protruding from the electrode assembly 100 can be reduced, so that the spacing space reserved between the electrode assembly 100 and the shell for accommodating the second empty foil area 122 is smaller, which is conducive to improving the energy density of the battery cell 10, and when the battery cell 10 is subjected to an external force, the electrode assembly 100 is less likely to shake relative to the shell, and the second empty foil area 122 is less likely to contact the first pole piece 110 and short circuit, which can reduce the risk of thermal runaway of the battery cell 10.

[0109] In some embodiments, the second empty foil area 122 is located at a third angle position of the second pole piece 120, and the second notch 112 is located at a fourth angle position of the first pole piece 110.

[0110] By making the second empty foil area 122 be located at a third angle position of the second pole piece 120, and the second notch 112 be located at a fourth angle position of the first pole piece 110, the preparation of the second notch 112 and the second empty foil area 122 can be facilitated, and the leading out of the second empty foil area 122 can be facilitated.

[0111] In some embodiments, the battery cell 10 includes a second electrical connection piece 220 and a second insulating piece 320, the second electrical connection piece 220 is connected with the second empty foil area 122 and forms a second connection area, and the second insulating piece 320 is annularly arranged and wraps the second connection area.

[0112] By making the battery cell 10 include the second electrical connecting piece 220 and the second insulating piece 320, the second electrical connecting piece 220 is connected with the second empty foil area 122 and forms a second connecting area, and the second insulating piece 320 is arranged in a ring shape and wraps the second connecting area, so that the possibility of the second insulating piece 320 being separated from the second connecting area after being soaked by the electrolyte is small, thereby making the second insulating piece 320 able to maintain insulation on the second connecting area and the first pole piece 110, further reducing the possibility of the second connecting area being in contact with the first pole piece 110 and short-circuiting, and making the safety of the battery cell 10 higher.

[0113] In some embodiments, the battery cell 10 includes a second sealing piece 520, and the second electrical connecting piece 220 extends out of the packaging bag 400 from the sealing edge part 420 along the third direction Z, and the second sealing piece 520 is arranged between the sealing edge part 420 and the second electrical connecting piece 220.

[0114] In some embodiments, the second insulating piece 320 is made of a heat-shrinkable material.

[0115] By making the second insulating piece 320 be made of a heat-shrinkable material, after the second insulating piece 320 wraps the second connecting area, the second insulating piece 320 can be shrunk by heat to be fixed on the second connecting area, and the possibility of the second insulating piece 320 being separated from the second connecting area after being subjected to force or soaked by the electrolyte is further small, thereby making the second insulating piece 320 able to maintain insulation on the second connecting area and the first pole piece 110, further reducing the possibility of the second connecting area being in contact with the first pole piece 110 and short-circuiting, and making the safety of the battery cell 10 higher.

[0116] In some embodiments, the second gap 113 has a fourth edge 1131 and a fifth edge 1132, the fourth edge 1131 is connected with the fifth edge 1132, and the second empty foil area 122 exceeds the fourth edge 1131 along the third direction Z. A part of the second insulating piece 320 is located between the second connecting area and the fifth edge 1132 along the second direction Y.

[0117] By making the second empty foil area 122 exceed the fourth edge 1131 along the third direction Z, and a part of the second insulating piece 320 is located between the second connecting area and the fifth edge 1132 along the second direction Y, the second insulating piece 320 can realize insulation between the second empty foil area 122 and the fifth edge 1132 along the second direction Y, and the possibility of the second empty foil area 122 being in contact with the first pole piece 110 and short-circuiting when the battery cell 10 is subjected to external force or falls is low, thereby making the safety of the battery cell 10 higher.

[0118] Referring to FIGS. 2, 3, and 11, FIG. 11 is a structure diagram of a separator of a battery cell provided in some embodiments of the present application.

[0119] In some embodiments, the diaphragm 130 has a third gap 131 and a fourth gap 132, and along the first direction X, the first empty foil area 111 at least partially overlaps with the third gap 131, and the second empty foil area 122 at least partially overlaps with the fourth gap 132.

[0120] By making the diaphragm 130 have a third gap 131 and a fourth gap 132, and along the first direction X, the first empty foil area 111 at least partially overlaps with the third gap 131, and the second empty foil area 122 at least partially overlaps with the fourth gap 132, the third gap 131 can be used to accommodate the first empty foil area 111, and the fourth gap 132 can be used to accommodate the second empty foil area 122, so that the plurality of first empty foil areas 111 and the plurality of second empty foil areas 122 can be respectively connected.

[0121] In some embodiments, the first gap 121 and the second empty foil area 122 are located at one end of the second tab 120 along the third direction Z, and the first gap 121 and the second empty foil area 122 are spaced apart along the second direction Y.

[0122] By making the first gap 121 and the second empty foil area 122 located at one end of the second tab 120 along the third direction Z, the first empty foil area 111 and the second empty foil area 122 can be led out from one end of the electrode assembly 110 along the third direction Z, so as to facilitate the electric core 10 to be electrically connected with the external device through the first empty foil area 111 and the second empty foil area 122. The first gap 121 and the second empty foil area 122 are spaced apart along the second direction Y, which can reduce the possibility of short circuit between the first empty foil area 111 and the second tab 120, and between the second empty foil area 122 and the first tab 110, thereby reducing the possibility of thermal runaway of the electric core 10 and improving the safety of the electric core 10.

[0123] In some embodiments, the first tab 110 is a positive electrode tab, and the second tab 120 is a negative electrode tab.

[0124] Referring to FIGS. 1 and 2, the battery cell includes an electrode assembly 100, a packaging bag 400, and an electrolyte, and the packaging bag 400 is used to accommodate the electrode assembly 100 and the electrolyte. The electrode assembly 100 is composed of a positive electrode tab, a negative electrode tab, and a separator 130. The battery cell 10 mainly relies on the movement of metal ions between the positive electrode tab and the negative electrode tab to work. The positive electrode tab includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, and the part of the positive electrode current collector without the positive electrode active material layer serves as a positive electrode tab to realize the input or output of electric energy of the positive electrode tab through the positive electrode tab. Taking a lithium ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary material, or lithium manganate, etc. The negative electrode tab includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, and the part of the negative electrode current collector without the negative electrode active material layer serves as a negative electrode tab to realize the input or output of electric energy of the negative electrode tab through the negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be a carbon material or a silicon material, etc. The material of the separator can be polypropylene (PP) or polyethylene (PE), etc. The electrolyte can include an organic solvent, an electrolyte lithium salt, etc.

[0125] Referring to FIGS. 12 and 13, FIG. 12 is a schematic diagram of one view of a partial structure of a battery cell provided by some embodiments of the present application; and FIG. 13 is a schematic diagram of the structure of a second tab of a battery cell provided by some embodiments of the present application.

[0126] In some embodiments, the first notch 121 further has a third edge 1213, the third edge 1213 is arranged along the second direction Y and spaced apart from the second edge 1212, and the first edge 1211 connects the second edge 1212 and the third edge 1213. Along the second direction Y, a part of the first insulating piece 310 is located between the first connecting area and the third edge 1213.

[0127] By arranging the part of the first insulating piece 310 between the first connecting area and the third edge 1213 along the second direction Y, the first insulating piece 310 can realize insulation between the first empty foil area 111 and the third edge 1213 along the second direction Y, and the possibility of short circuit between the first empty foil area 111 and the second tab 120 when the battery cell 10 is subjected to external force or falls is low, so that the safety of the battery cell 10 is high.

[0128] Referring to FIG. 14, FIG. 14 is a schematic diagram of a partial structure of a battery cell provided by some embodiments of the present application.

[0129] In some embodiments, the electrode assembly 100 is in a jelly-roll structure, and the electrode assembly 100 is formed by stacking and rolling the first tab 110, the second tab 120, and the separator 130.

[0130] The electric core 10 comprises a first electric connecting piece 210 and a second electric connecting piece 220, the first pole piece 110 has a first empty foil area 111, the first electric connecting piece 210 is connected with the first empty foil area 111 and forms a first connecting area. The first insulating piece 310 is annularly arranged and wraps the first connecting area. The second pole piece 120 has a second empty foil area 122, the second electric connecting piece 220 is connected with the second empty foil area 122 and forms a second connecting area. The second insulating piece 320 is annularly arranged and wraps the second connecting area.

[0131] Referring to FIGS. 5 and 6, some embodiments of the present application provide an insulating piece (the first insulating piece 310), which is annularly arranged and made of heat-shrinkable material and used for insulating the empty foil area of the electric core 10.

[0132] The insulating piece is arranged at the empty foil area of the electric core 10 and can realize insulation between the empty foil area and the pole piece, so that the possibility of short circuit between the empty foil area and the pole piece is low when the electric core 10 is subjected to external force or falls, and the safety of the electric core 10 is high. The insulating piece does not increase the thickness of the electrode assembly 100 and is beneficial to improving the energy density of the electric core 10. The insulating piece is annularly arranged and can make the possibility of separation between the insulating piece and the empty foil area after being soaked by the electrolyte solution low, so that the insulating piece can maintain insulation to the empty foil area and the pole piece, further reducing the possibility of short circuit between the empty foil area and the pole piece, and making the safety of the electric core 10 higher.

[0133] The embodiments of the present application provide a power-using device comprising the electric core 10 of any one of the above-mentioned schemes, and the electric core 10 is used for providing electric energy for the power-using device.

[0134] The power-using device can be any one of the devices or systems using the electric core 10.

[0135] It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0136] The above is only the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An electric cell, characterized by, The electrode assembly comprises a first electrode tab, a second electrode tab, and a separator, the first electrode tab and the second electrode tab are opposite in polarity, the first electrode tab and the second electrode tab are stacked, and the separator is arranged between the first electrode tab and the second electrode tab; the first electrode tab has a first empty foil area; A first electrical connection is connected to the first empty foil area and forms a first connection area; A first insulating member is arranged in a ring shape and wraps at least part of the first connection area. The first insulating member comprises a first insulating part, a second insulating part, a third insulating part, and a fourth insulating part, the first insulating part and the second insulating part are arranged on both sides of the first connection area in a first direction, and the third insulating part and the fourth insulating part are arranged on both sides of the first connection area in a second direction; 2. The electric cell of claim 1, wherein, The third insulating part connects the first insulating part and the second insulating part, and the fourth insulating part connects the first insulating part and the second insulating part; The first direction is perpendicular to the second direction. The thickness of the first insulating part is H1, which satisfies H1≥10μm; and / or, the thickness of the second insulating part is H2, which satisfies H2≥10μm.

3. The electric cell of claim 1, wherein, The first insulating member is made of heat-shrinkable material.

4. The electric cell of claim 1, wherein, The battery cell comprises a packaging bag and a first sealing member, the packaging bag comprises a main body part and a sealing edge part, the electrode assembly is accommodated in the main body part, the first electrical connection extends out of the packaging bag from the sealing edge part in a third direction, and the first sealing member is arranged between the sealing edge part and the first electrical connection; 5. The electric cell of claim 1, wherein, In the third direction, the first insulating member and the first sealing member are spaced apart by a distance D, which satisfies 0 The first electrode tab has a first coating area, the first empty foil area of a plurality of the first electrode tabs is gathered to form a gathered part, the gathered part comprises a first section and a second section, the first section is connected to the first coating area, the second section is bent relative to the first section, and the second section is connected to the first electrical connection; 6. The electric cell of claim 1, wherein, The first insulating member wraps the entire second section. The electrode assembly has a stacked structure, and comprises a plurality of the first electrode tabs, a plurality of the second electrode tabs, and a plurality of the separators, the plurality of the first electrode tabs and the plurality of the second electrode tabs are stacked in a first direction, and the plurality of the separators are arranged between the first electrode tabs and the second electrode tabs; 7. The cell of any of claims 1-6, wherein, Each second electrode tab has a first notch, and the first empty foil area at least partially overlaps the first notch in the first direction. The first notch has a first edge and a second edge, the first edge is connected to the second edge, and the first empty foil area exceeds the first edge in a third direction; 8. The electric cell of claim 7, wherein, In a second direction, a part of the first insulating member is located between the first connection area and the second edge; The first direction, the second direction, and the third direction are perpendicular to each other. In the third direction, the first insulating member exceeds the second edge away from one end of the first edge.

9. The electric cell of claim 8, wherein, ​ 10. The electric cell of claim 8, wherein, The first gap further has a third edge, which is spaced apart from the second edge along the second direction, and the first edge connects the second edge and the third edge; In the second direction, a part of the first insulating member is located between the first connecting area and the third edge.

11. The electric cell of claim 7, wherein, The first foil-free area is located at a first corner position of the first tab, and the first gap is located at a second corner position of the second tab.

12. The electric cell of claim 7, wherein, Each of the second tabs has a second foil-free area, and each of the first tabs has a second gap, and in the first direction, the second foil-free area at least partially overlaps the second gap; The battery cell further comprises a second electrical connecting member and a second insulating member, the second electrical connecting member is connected with the second foil-free area and forms a second connecting area, and the second insulating member is annularly arranged and wraps the second connecting area.

13. An insulating member characterized by comprising: The insulating member is annularly arranged and is made of heat-shrinkable material, and is used for insulation of a foil-free area of a battery cell.

14. An electrical device, characterized by The battery cell as claimed in any one of claims 1-12 is used for providing electric energy.

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