CN214672732U - Energy storage device and electronic equipment - Google Patents
Energy storage device and electronic equipment Download PDFInfo
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- CN214672732U CN214672732U CN202120909496.XU CN202120909496U CN214672732U CN 214672732 U CN214672732 U CN 214672732U CN 202120909496 U CN202120909496 U CN 202120909496U CN 214672732 U CN214672732 U CN 214672732U
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The utility model relates to an energy storage device and an electronic device, wherein the energy storage device comprises a positive plate, a negative plate and two isolating membranes; one of the positive plate and the negative plate is positioned between the two isolating films, the other one of the positive plate and the negative plate is positioned outside one of the isolating films, the positive plate, the negative plate and the two isolating films form a spiral winding structure, and a through hole is formed in the middle of the winding structure; at the beginning of the winding structure, at least one of the barrier films extends into the through hole. Utility model's an usage is through the initiating terminal at winding structure, makes at least one barrier film extend in the through-hole, stretches into the barrier film in the through-hole and helps absorbing electrolyte to the barrier film part that stretches into the through-hole makes winding structure's top more complete to the parcel of positive plate and negative pole piece, can prevent that positive plate and negative pole piece from exposing, and such structure has improved the insulating effect of barrier film at winding structure's top.
Description
Technical Field
The utility model relates to an energy storage technology field, more specifically, the utility model relates to an energy storage device and electronic equipment.
Background
The energy storage device is used for providing energy for the equipment, and the safety of the energy storage device influences the safe use of the equipment. The arrangement of the positive plate and the negative plate in the energy storage device influences the safety of the energy storage device, the insulation effect between the positive plate and the negative plate is insufficient, and the problem of insufficient safety of the energy storage device is easily caused. Therefore, a new technical solution is needed to solve the above problems.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an energy storage device and electronic equipment to solve the not enough problem of energy storage device's security.
According to an aspect of the present invention, there is provided an energy storage device, comprising a positive plate, a negative plate and two isolation films;
one of the positive plate and the negative plate is positioned between the two isolating films, the other one of the positive plate and the negative plate is positioned outside one of the isolating films, the positive plate, the negative plate and the two isolating films form a spiral winding structure, and a through hole is formed in the middle of the winding structure;
at the beginning of the winding structure, at least one of the barrier films extends into the through hole.
Optionally, a portion of the isolation film extending into the through hole abuts against a wall of the through hole.
Optionally, the positive electrode tab and/or the negative electrode tab has a first connection portion;
the winding structure is characterized by further comprising tabs, the tabs correspond to the first connecting parts one by one, each tab is provided with a second connecting part, the second connecting parts are electrically connected with the first connecting parts, and the tabs are bent and lean against the end parts of the winding structure;
the insulation layer is in one-to-one correspondence with the lugs, the insulation layer covers one side, close to the end, of each lug and extends to cover the first connecting portion and the second connecting portion.
Optionally, the lithium ion battery further comprises a first tab and a second tab, wherein the first tab is electrically connected with the positive plate, and the second tab is electrically connected with the negative plate;
the first tab is bent and leans against one end of the winding structure, the second tab is bent and leans against the other end of the winding structure, and an included angle formed by projections of the first tab and the second tab on the cross section of the winding structure is 0-90 degrees.
Optionally, the winding structure is arranged in the shell, the shell is welded with the electrode lug, two welding points are arranged at the welding position, and the distance between the two welding points is 0.5mm-5 mm.
Optionally, one of the welding spots is located in the projection of the through hole along the axial direction of the winding structure.
Optionally, the device further comprises a housing, the housing comprises an inner housing and an outer housing, the inner housing and the outer housing are both of a cylindrical structure with an opening at one end, and the outer housing is sleeved outside the inner housing to seal the cylindrical structure;
the inner shell with be provided with the sealing washer between the shell, the exposure of sealing washer the width of the opening of shell is greater than 0.5 mm.
Optionally, the inner shell comprises a top plate and a first sidewall disposed around the top plate to form a cylindrical structure;
the housing includes a floor and a second sidewall disposed around the floor to form a tubular structure;
the second side wall is sleeved outside the first side wall, the sealing ring is arranged between the second side wall and the first side wall, and the overlapping area between the first side wall and the second side wall accounts for 10% -90%.
Optionally, two of the isolation films are formed by folding a single isolation film.
Optionally, in the axial direction of the winding structure, the size of the negative electrode sheet at each end of the winding structure is greater than the size of the positive electrode sheet by 0.1mm or more.
Optionally, in the axial direction of the winding structure, the size of the separation film at each end of the winding structure is greater than the size of the negative electrode sheet by more than 0.5 mm.
Optionally, the cross section of the portion of the isolation film located in the through hole is linear or S-shaped.
Optionally, the portion of the isolation diaphragm located within the through hole extends in a radial direction of the through hole.
According to another aspect of the present invention, there is provided an electronic apparatus including the energy storage device as described above.
The utility model discloses a technical effect lies in, through the initiating terminal at winding structure, makes at least one barrier film extend in the through-hole, stretches into the barrier film in the through-hole and helps absorbing electrolyte to the barrier film part that stretches into the through-hole makes winding structure's top more complete to the parcel to positive pole piece and negative pole piece, can prevent that positive pole piece and negative pole piece from exposing, and such structure has improved the insulating effect of barrier film at winding structure's top.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a cross-sectional view of a jellyroll structure in one embodiment of the present disclosure.
Fig. 2 is a schematic structural view of a jellyroll structure in one embodiment of the present disclosure.
Fig. 3 is a schematic view of an end face of a jellyroll structure in one embodiment of the present disclosure.
Fig. 4 is a schematic structural diagram of a side surface of the positive electrode sheet on which the first tab is provided in one embodiment of the present disclosure.
Fig. 5 is a schematic view of the other side of fig. 4.
Fig. 6 is a schematic structural view of a jellyroll structure in another embodiment of the present disclosure.
Fig. 7 is a schematic structural diagram of a welding point for welding a shell and a tab of an energy storage device according to an embodiment of the disclosure.
Fig. 8 is a cross-sectional view of an energy storage device in an embodiment of the present disclosure.
In the figure: 1-positive plate, 10-first connecting part, 2-negative plate, 3-isolating film, 40-second connecting part, 41-first pole lug, 42-second pole lug, 5-insulating layer, 6-winding structure, 60-through hole, 7-shell, 71-inner shell, 72-outer shell, 8-welding point and 9-sealing ring.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be considered a part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
According to one embodiment of the present disclosure, as shown in fig. 1 to 3, there is provided an energy storage device including a positive electrode tab 1, a negative electrode tab 2, and two separation films 3.
One of the positive plate 1 and the negative plate 2 is located between the two isolation films 3, the other is located outside one of the isolation films 3, the positive plate 1, the negative plate 2 and the two isolation films 3 form a spiral winding structure 6, and a through hole 60 is formed in the middle of the winding structure 6.
At the beginning of the winding structure 6, at least one of the separators 3 extends within the through-hole 60.
In this embodiment, the separator 3 forms insulation between the positive electrode tab 1 and the negative electrode tab 2, and is capable of allowing passage of electric ions for charge and discharge. For example, the separator 3 allows lithium ions to pass therethrough. The two separators 3 can form insulation between the positive electrode tab 1 and the negative electrode tab 2. In the structure before the winding, the positive electrode sheet 1, the negative electrode sheet 2, and the separator 3 are laminated together. One of the separators 3 is located between the positive electrode tab 1 and the negative electrode tab 2, and forms a separator on the inside. The other separator 3 is on the outer side of the positive electrode tab 1 or the negative electrode tab 2. After the winding structure is formed, the positive electrode sheet 1 and the negative electrode sheet 2 are wound together on the outside when the stack is not wound, and the separator 3 located on the outside forms a separation between the positive electrode sheet 1 and the negative electrode sheet 2 on the outside when the stack is not wound.
After the winding structure 6 is formed, a through hole 60 is formed in the middle, and the starting end of the winding forms a part of the hole wall of the through hole 60.
At least one of the separators 3 extends within the through-hole 60 by leaving a portion of the separator 3 at the beginning of the winding structure 6. The separator 3 located in the through-hole 60 is not pressed by the positive electrode tab 1 and the negative electrode tab 2. The separator 3 extending into the through-hole 60 helps absorb the electrolyte when the cell is in the electrolyte.
The part of the isolating film 3 extending into the through hole 60 enables the initial end of the winding structure 6 to completely wrap the positive plate 1 and the negative plate 2, and can prevent the positive plate 1 and the negative plate 2 from being exposed. Such a structure improves the insulating effect of the separator 3 at the beginning of the winding structure 6 to improve the safety of the energy storage device.
Optionally, the end of the isolation diaphragm 3 abuts against the wall of the through hole 60.
The portion of the isolation film 3 extending into the through-hole 60 abuts against the wall of the through-hole 60, thereby further providing an insulating effect. For example, a short-circuit problem can be avoided when the leading ends of the positive electrode sheet 1 and the negative electrode sheet 2 protrude into the through-holes 60. The end of the isolation film 3 is abutted against the wall of the through hole 60, effectively isolating the through hole 60 and forming two insulation spaces separated by the isolation film 3. The isolating film 3 forms insulation between the two separated spaces, so that the insulation effect of the winding structure 6 is further improved, and the safety of the energy storage device is improved.
Optionally, two of the separation films 3 are formed by folding a single separation film.
For example, the two separators 3 are formed by folding one separator 3 in half, and the positive electrode sheet 1 or the negative electrode sheet 2 positioned between the two separators 3 is sandwiched between the folded separators 3.
The structure in which one separator 3 is folded in half to form two separators 3 can increase the structural strength of the winding structure 6. The strength of the insulation structure formed by the barrier film 3 to the positive electrode plate 1 and the negative electrode plate 2 is improved, and the structural strength of the whole winding structure 6 is improved.
For example, the single separator 3 is folded in half at the position of the start or end when the winding structure 6 is wound, which can effectively form an insulating effect at the end. When not wound, the separator 3 may be folded in half at a position on one side of the positive electrode sheet 1 or the negative electrode sheet 2. The positive electrode sheet 1 and the negative electrode sheet 2 have two sides at the beginning and the end, and two sides connecting the beginning and the end.
For example, a single separator 3 is folded in half along the long side parallel to itself or folded in half perpendicular to the long side. The long side is the side of the separator 3 in the longitudinal direction.
Alternatively, the winding structure 6 is wound by using a double needle, and the winding needle is drawn after the winding structure 6 is formed. The separator 3 extending in the through-hole 60 is held between the two winding pins, which effectively keeps the partial structure of the separator 3 at the projecting end portion position during winding to be kept in the through-hole 60 after the winding structure 6 is formed.
It is also possible to use single-needle winding, in which the winding needle is withdrawn after winding to form the winding structure 6. The position of the portion of the separator 3 protruding into the through-hole 60 can be adjusted according to the positions of the ends of the positive electrode tab 1 and the negative electrode tab 2 in the through-hole 60.
Optionally, the cross section of the portion of the isolation film 3 located in the through hole 60 is linear or S-shaped.
The partial structure of the isolation film 3 in the through-hole 60 may be linearly extended, or the partial structure of the isolation film 3 extended may be S-shaped. May be adjusted according to the actual configuration and requirements within the through-hole 60. The portions of the isolating membrane 3 extending into the through-hole 60 have different shapes, the different shapes providing different surface areas. The different shapes of the isolating membrane 3 have different contact areas with the electrolyte and have different absorption effects.
Alternatively, the portion of the isolation diaphragm 3 located inside the through-hole 60 extends in the radial direction of the through-hole 60.
The isolation film 3 extends radially inside the through-hole 60, and can isolate the through-hole 60 into two uniform parts. This makes it possible to provide the spaces on both sides of the separator 3 with the same holding capacity, and to satisfy the available space in which the positive electrode tab 1 or the negative electrode tab 2 protrudes into the through-hole 60.
The through holes 60 facilitate the entry of electrolyte in the energy storage device, increase the contact area between the electrolyte and the positive plate 1 and the negative plate 2, and improve the charge and discharge capacity.
Optionally, a portion of the isolation diaphragm 3 extending within the through hole 60 has a larger size in the radial direction of the through hole 60 than the radial size of the through hole 60.
In this embodiment, the dimension of the portion of the isolation film 3 extending into the through-hole 60 is larger relative to the radial dimension of the through-hole 60. When the end of the isolation film 3 abuts against the inner wall of the through-hole 60, the isolation film 3 can form effective isolation in the through-hole 60 to increase the insulating effect. For example, the separator 3 extends from the start end of the winding structure 6 into the through-hole 60, and the end portions of the positive electrode tab 1 and the negative electrode tab 2 on both sides of the separator 3 are located on both sides of the structure of the separator 3 extending into the through-hole 60.
The size of the separator 3 is larger, and when the separator 3 is set to different shapes or different states, two spaces insulated from each other can be effectively formed at the starting end to form effective separation between the starting ends of the positive electrode tab 1 and the negative electrode tab 2. Gaps are avoided between two sides of the isolating membrane 3 isolated in the through hole 60, and the insulating effect is improved.
In one embodiment, the positive electrode tab 1 and/or the negative electrode tab 2 has a first connection portion;
still include utmost point ear, utmost point ear with first connecting portion one-to-one, utmost point ear has the second connecting portion, the second connecting portion with first connecting portion electricity is connected, utmost point ear buckle and lean on to winding structure 6's tip.
Still include insulating layer 5, insulating layer 5 with utmost point ear one-to-one, the 5 cladding of insulating layer utmost point ear lean on to one side of tip to extend to the cladding first connecting portion with the second connecting portion.
In this embodiment, the insulating layer 5 forms insulation between the end of the winding structure 6 and the tab, and extends to cover the first connection portion and the second connection portion, thereby forming an insulating effect at the position where the tab is provided on the positive electrode sheet 1 or the negative electrode sheet 2.
The insulating layer 5 covers the tab from one side thereof, and covers the position where the tab is connected to the positive electrode sheet 1 or the negative electrode sheet 2. I.e. from one side of the tab towards the end of the winding arrangement 6 to the other. Compared with the prior art that the two sides of the electrode lug are respectively provided with insulation, the single insulation layer 5 is more convenient and simpler. The single insulating layer 5 can cover the tab and the positive electrode sheet 1 or the negative electrode sheet 2 connected to the tab at the end of the tab. The insulating effect is improved. The insulating layer 5 is only required to be arranged once, so that the process of arranging the insulating layer 5 is reduced, and the efficiency is improved.
As shown in fig. 4 and 5, the first tab 41 provided on the positive tab 1 will be described as an example. The first connection portion 10 of the positive electrode tab 1 and the second connection portion 40 of the first tab 41 are connected, for example, by a welding machine to form an electrical connection.
The insulating layer 5 covers the first tab 41 from one side thereof, extends through the second connection portion 40, passes through the connection position of the first connection portion 10 and the second connection portion 40 and bypasses the end of the first tab 41, and finally covers the first connection portion 10. The side of the insulating layer 5 where the coating starts is the side bent back towards the end of the coiled structure 6.
In this example, the tab is located on the outer side of the wound structure 6 with respect to the positive electrode sheet 1 or the negative electrode sheet 2 to be connected. The tab may be located inside the positive electrode tab 1 or the negative electrode tab 2 to be connected.
In one embodiment, as shown in fig. 6, the tab structure further comprises a first tab 41 and a second tab 42, wherein the first tab 41 is electrically connected to the positive electrode tab 1, and the second tab 42 is electrically connected to the negative electrode tab 2.
The first tab 41 is bent and close to one end of the winding structure 6, the second tab 42 is bent and close to the other end of the winding structure 6, and an included angle between projections of the first tab 41 and the second tab 42 on the cross section of the winding structure 6 is 0-90 degrees.
In this embodiment, a first tab 41 is provided at the end of the positive electrode tab 1, and a second tab 42 is provided at the end of the negative electrode tab 2. After the winding structure 6 is formed, the negative electrode sheet 2 is located at an outer layer with respect to the positive electrode sheet 1, and the negative electrode sheet 2 needs to be wound at the end with respect to the positive electrode sheet 1 for a greater distance, so that the charge and discharge functions of the formed cell are more excellent.
The included angle between the projections of the first tab 41 and the second tab 42 on the cross section of the winding structure 6 is 0-90 degrees, that is, the tail end of the negative electrode sheet 2 is wound around the outer layer of the winding structure 6 by 0-90 degrees relative to the tail end of the positive electrode sheet 1. Therefore, the condition that the outermost negative plate 2 is more than the outermost positive plate 1 is met, and meanwhile, the negative plates 2 with more sizes do not need to be wound in the circumferential direction, so that the material is saved, and the cost is reduced.
In one embodiment, as shown in fig. 7, the energy storage device further comprises a shell 7, the winding structure 6 is arranged in the shell 7, the shell 7 is welded with the tab, the welding position is provided with two welding points 8, and the distance between the two welding points 8 is 0.5mm-5 mm.
In this embodiment, the tab is fixed and electrically connected to the housing 7 by welding. For example, by means of a double pin solder. The distance between the two welding spots 8 is 0.5mm-5mm, so that the welding requirement can be met, and the welding position can be prevented from being separated from the pole lug to avoid insufficient welding.
For example, when the first tab 41 on the positive electrode sheet 1 is welded with the casing 7, and the second tab 42 on the negative electrode sheet 2 is welded with the casing 7, the distance between the two welding points 8 is 0.5mm-5 mm.
Optionally, one of the welding spots 8 is located in the projection of the through hole 60 along the axial direction of the winding structure 6. The weld 8 in the projection of the through-hole 60 serves as a central weld of the welding lug to the housing 7 to define the location of the weld at the time of welding.
In this embodiment, the projection of the through hole 60 will be at a position coinciding with the housing 7 and the tab in the axial direction of the winding structure 6. One of the weld spots 8 is located within the projection, which can define the position of both weld spots 8. The welding spot 8 is prevented from being separated from the position where the shell 7 and the pole lug coincide, and therefore the welding spot 8 of the cold joint is prevented from being arranged at the welding position.
In one embodiment, as shown in fig. 8, the energy storage device further includes a housing 7, where the housing 7 includes an inner shell 71 and an outer shell 72, the inner shell 71 and the outer shell 72 are both of a cylindrical structure with one end open, and the outer shell 72 is sleeved outside the inner shell 71 to seal the cylindrical structure.
A sealing ring 9 is arranged between the inner shell 71 and the outer shell 72, and the width of an opening of the sealing ring 9 exposed out of the outer shell 72 is larger than 0.5 mm.
In this embodiment, the sealing ring 9 forms a seal and insulation between the inner shell 71 and the outer shell 72. The width of the opening of the sealing ring 9, which is exposed out of the outer shell 72, is larger than 0.5mm, so that the outer shell 72 can be effectively prevented from contacting with the inner shell 71, and the insulation effect is improved.
In one embodiment, the inner shell 71 includes a top plate and a first sidewall disposed around the top plate to form a cylindrical structure.
The housing 72 includes a bottom plate and a second sidewall disposed around the bottom plate to form a cylindrical structure.
The second side wall is sleeved outside the first side wall, the sealing ring 9 is arranged between the second side wall and the first side wall, and the overlapping area between the first side wall and the second side wall accounts for 10% -90%.
In this embodiment, the first and second sidewalls are the sidewall locations of the tubular structure. The overlapping portion of the first sidewall and the second sidewall determines the area of the region where the inner case 71 and the outer case 72 are connected. The overlapping area between the first side wall and the second side wall is 10% -90%, the structural strength of the outer shell 72 and the inner shell 71 which are sleeved together can be effectively guaranteed, and the sealing effect of the sealing ring 9 between the first side wall and the second side wall can be guaranteed.
Alternatively, the first tab 41 connected to the positive electrode tab 1 is electrically connected to one of the top plate on the inner case 71 or the bottom plate on the outer case 72. The second tab 42 of the negative electrode tab 2 is electrically connected to the other of the top plate of the inner case 71 or the bottom plate of the outer case 72.
In one embodiment, as shown in fig. 1, the size of the negative electrode tab 2 at each end of the winding structure 6 is greater than the size of the positive electrode tab 1 by 0.1mm or more in the axial direction of the winding structure 6.
In this embodiment, the negative electrode sheet 2 is larger in size at the end of the winding structure 6 relative to the positive electrode sheet 1, so that the negative electrode sheet 2 has more volume to meet the consumption requirement of the negative electrode sheet 2 in charge and discharge.
As shown in fig. 1, at the upper end and the lower end of the winding structure 6, the negative electrode sheet 2 is higher than the positive electrode sheet by more than 0.1mm, so as to meet the requirement of the energy storage device on consumption of the negative electrode sheet 2 during charging and discharging.
In one embodiment, as shown in fig. 1, the size of the separator 3 at each end of the wound structure 6 is greater than the size of the negative electrode tab 2 by 0.5mm or more in the axial direction of the wound structure 6.
As shown in fig. 1, the separator 3 is higher than the negative electrode sheet by 0.5mm or more at both the upper and lower ends of the winding structure 6, so that the separator 3 can effectively insulate the positive and negative electrode sheets 1 and 2 at the ends of the winding structure 6.
According to another embodiment of the present disclosure, there is provided an electronic apparatus including the energy storage device according to any one of the above embodiments.
The energy storage device in the embodiment is used for the electronic equipment, and the use safety of the electronic equipment is improved. For example, the electronic device may be a mobile phone, a tablet computer, an earphone, or other devices that require energy supplied by the energy storage device.
In the above embodiments, the differences between the embodiments are described in emphasis, and different optimization features between the embodiments can be combined to form a better embodiment as long as the differences are not contradictory, and further description is omitted here in consideration of brevity of the text.
Although some specific embodiments of the present invention have been described in detail by way of illustration, it should be understood by those skilled in the art that the above illustration is only for purposes of illustration and is not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (14)
1. An energy storage device is characterized by comprising a positive plate, a negative plate and two isolating films;
one of the positive plate and the negative plate is positioned between the two isolating films, the other one of the positive plate and the negative plate is positioned outside one of the isolating films, the positive plate, the negative plate and the two isolating films form a spiral winding structure, and a through hole is formed in the middle of the winding structure;
at the beginning of the winding structure, at least one of the barrier films extends into the through hole.
2. The energy storage device of claim 1, wherein a portion of the isolation diaphragm extending within the through-hole abuts against a wall of the through-hole.
3. The energy storage device according to claim 1, wherein the positive electrode tab and/or the negative electrode tab has a first connection portion;
the winding structure is characterized by further comprising tabs, the tabs correspond to the first connecting parts one by one, each tab is provided with a second connecting part, the second connecting parts are electrically connected with the first connecting parts, and the tabs are bent and lean against the end parts of the winding structure;
the insulation layer is in one-to-one correspondence with the lugs, the insulation layer covers one side, close to the end, of each lug and extends to cover the first connecting portion and the second connecting portion.
4. The energy storage device of claim 1, further comprising a first tab electrically connected to the positive plate and a second tab electrically connected to the negative plate;
the first tab is bent and leans against one end of the winding structure, the second tab is bent and leans against the other end of the winding structure, and an included angle formed by projections of the first tab and the second tab on the cross section of the winding structure is 0-90 degrees.
5. The energy storage device as claimed in claim 3, further comprising a housing, wherein the winding structure is disposed in the housing, the housing is welded to the tab at a location having two weld points, and the distance between the two weld points is 0.5mm to 5 mm.
6. The energy storage device of claim 5, wherein one of said welds is located within a projection of said through-hole in an axial direction of said coiled structure.
7. The energy storage device as claimed in claim 1, further comprising a housing, wherein the housing comprises an inner shell and an outer shell, the inner shell and the outer shell are both of a cylindrical structure with one end open, and the outer shell is sleeved outside the inner shell to seal the cylindrical structure;
the inner shell with be provided with the sealing washer between the shell, the exposure of sealing washer the width of the opening of shell is greater than 0.5 mm.
8. The energy storage device of claim 7, wherein the inner housing comprises a top plate and a first sidewall disposed about the top plate to form a cylindrical structure;
the housing includes a floor and a second sidewall disposed around the floor to form a tubular structure;
the second side wall is sleeved outside the first side wall, the sealing ring is arranged between the second side wall and the first side wall, and the overlapping area between the first side wall and the second side wall accounts for 10% -90%.
9. The energy storage device as defined in claim 1, wherein said two separator membranes are folded from a single separator membrane.
10. The energy storage device according to claim 1, wherein the dimension of the negative electrode sheet at each end of the wound structure in the axial direction of the wound structure is 0.1mm or more larger than the dimension of the positive electrode sheet.
11. The energy storage device according to claim 1, wherein the size of the separator at each end of the wound structure is greater than the size of the negative electrode sheet by 0.5mm or more in the axial direction of the wound structure.
12. The energy storage device of claim 1, wherein the portion of the isolation diaphragm located within the through-hole has a linear or S-shaped cross-section.
13. The energy storage device of claim 1, wherein the portion of the isolation diaphragm located within the through-hole extends in a radial direction of the through-hole.
14. An electronic device, characterized in that it comprises an energy storage device according to any one of claims 1-13.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120909496.XU CN214672732U (en) | 2021-04-28 | 2021-04-28 | Energy storage device and electronic equipment |
| PCT/CN2022/087535 WO2022228193A1 (en) | 2021-04-28 | 2022-04-19 | Energy storage device and electronic apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120909496.XU CN214672732U (en) | 2021-04-28 | 2021-04-28 | Energy storage device and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214672732U true CN214672732U (en) | 2021-11-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120909496.XU Active CN214672732U (en) | 2021-04-28 | 2021-04-28 | Energy storage device and electronic equipment |
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| Country | Link |
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| CN (1) | CN214672732U (en) |
| WO (1) | WO2022228193A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022228193A1 (en) * | 2021-04-28 | 2022-11-03 | 广东微电新能源有限公司 | Energy storage device and electronic apparatus |
| WO2022228194A1 (en) * | 2021-04-28 | 2022-11-03 | 广东微电新能源有限公司 | Cell, energy storage device and electronic apparatus |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4784042B2 (en) * | 2003-12-12 | 2011-09-28 | パナソニック株式会社 | Lithium ion secondary battery and manufacturing method thereof |
| CN202695639U (en) * | 2012-06-29 | 2013-01-23 | 广东凯德能源科技有限公司 | Clamping type lithium battery |
| CN210156500U (en) * | 2019-05-16 | 2020-03-17 | 广东微电新能源有限公司 | Lithium ion battery |
| CN110611116A (en) * | 2019-09-26 | 2019-12-24 | 广东微电新能源有限公司 | Electrode plate for battery roll core and columnar or button battery |
| CN111446480A (en) * | 2020-04-29 | 2020-07-24 | 广东微电新能源有限公司 | Preparation method of battery cell of energy storage device and battery cell |
| CN212303731U (en) * | 2020-04-29 | 2021-01-05 | 广东微电新能源有限公司 | Battery cell of energy storage device and energy storage device |
| CN211789247U (en) * | 2020-05-12 | 2020-10-27 | 路华置富电子(深圳)有限公司 | Full-insulation connection structure of tab and pole piece and battery using same |
| CN112259805A (en) * | 2020-10-29 | 2021-01-22 | 东莞市创明电池技术有限公司 | Electricity core book needle and electricity core winder |
| CN214672732U (en) * | 2021-04-28 | 2021-11-09 | 广东微电新能源有限公司 | Energy storage device and electronic equipment |
| CN214672887U (en) * | 2021-04-28 | 2021-11-09 | 广东微电新能源有限公司 | Battery cell, energy storage device and electronic equipment |
-
2021
- 2021-04-28 CN CN202120909496.XU patent/CN214672732U/en active Active
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- 2022-04-19 WO PCT/CN2022/087535 patent/WO2022228193A1/en active Application Filing
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022228193A1 (en) * | 2021-04-28 | 2022-11-03 | 广东微电新能源有限公司 | Energy storage device and electronic apparatus |
| WO2022228194A1 (en) * | 2021-04-28 | 2022-11-03 | 广东微电新能源有限公司 | Cell, energy storage device and electronic apparatus |
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| Publication number | Publication date |
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| WO2022228193A1 (en) | 2022-11-03 |
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