CN221239773U - Single battery, battery and electricity utilization device - Google Patents
Single battery, battery and electricity utilization device Download PDFInfo
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- CN221239773U CN221239773U CN202322900129.5U CN202322900129U CN221239773U CN 221239773 U CN221239773 U CN 221239773U CN 202322900129 U CN202322900129 U CN 202322900129U CN 221239773 U CN221239773 U CN 221239773U
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
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- 229910052799 carbon Inorganic materials 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
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- 239000002737 fuel gas Substances 0.000 description 1
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- 229910052742 iron Inorganic materials 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
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Classifications
-
- 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
Landscapes
- Connection Of Batteries Or Terminals (AREA)
Abstract
The utility model provides a single battery, a battery and an electricity utilization device, wherein the single battery comprises: the electrode assembly includes a case, a first cap plate, an electrode assembly, a first terminal, a first insulating member, a first insulating holder, and an insulating member. The housing includes a first opening; the first cover plate is hermetically arranged on the first opening; the electrode assembly is arranged in the shell, and a first tab extends out of one side of the electrode assembly, which faces the first cover plate; the first terminal penetrates through the first cover plate to be installed and connected with the first tab in a conductive mode; the first insulating member is mounted at a side of the first cap plate facing the electrode assembly; the first insulating support is arranged between the first insulating piece and the electrode assembly; the insulating member is disposed opposite the free end of the first tab and at least partially covers the gap between the first insulating member and the first insulating support. The utility model can solve the technical problem that the tab sheet extends out of the gap between the insulating piece and the insulating bracket to contact the inner wall of the shell in the existing single battery.
Description
Technical Field
The utility model relates to the technical field of batteries, in particular to a single battery, a battery and an electric device.
Background
In the current battery cell, in order to solve the inside utmost point ear of casing and the problem that shells inner wall contacted, can set up insulating part and insulating support between apron and electrode assembly generally, however there is the butt joint gap between current insulating part and the insulating support, and the inside redundant utmost point ear of casing exists and stretches out the risk of contact shells inner wall from the gap of insulating part and insulating support, has reduced battery safety.
Disclosure of utility model
In view of the above drawbacks of the prior art, the present utility model provides a single battery, a battery and an electric device, so as to solve the technical problem that in the existing single battery, a tab protrudes from a gap between an insulating member and an insulating bracket to contact an inner wall of a housing.
To achieve the above and other related objects, the present utility model provides a battery cell including: the electrode assembly includes a case, a first cap plate, an electrode assembly, a first terminal, a first insulating member, a first insulating holder, and an insulating member. The housing includes a first opening; the first cover plate is hermetically arranged on the first opening; the electrode assembly is arranged in the shell, and a first tab extends out from one side close to the first cover plate; the first terminal is arranged on the first cover plate and is in conductive connection with the first tab; the first insulating member is mounted on one side of the first cap plate, which is close to the electrode assembly; the first insulating support is arranged between the first insulating piece and the electrode assembly; the insulating member is disposed opposite the free end of the first tab and at least partially covers the gap between the first insulating member and the first insulating support.
In an example of the single battery of the present utility model, the insulating member is disposed between the side wall of the housing and the first insulating member, and one side of the insulating member facing the free end of the first tab is at least partially abutted against the outer side of the side wall of the first insulating member, and at least another part is abutted against the outer side of the side wall of the first insulating bracket.
In one example of the battery cell according to the present utility model, the first insulating member and/or the first insulating holder is provided with a groove on a side facing the insulating member, and the insulating member is at least partially accommodated in the groove.
In an example of the battery cell of the present utility model, the groove includes a first groove portion provided on the first insulating member and a second groove portion provided on the first insulating holder, a groove bottom wall of the first groove portion being flush with a groove bottom wall of the second groove portion.
In an example of the single battery of the present utility model, the first groove portion and the second groove portion are equal in height in the thickness direction of the first cover plate.
In one example of the single battery of the utility model, the groove is at least partially arranged on the side wall of the first insulating member, and the thickness of the insulating member is 50% -60% of the thickness of the side wall of the first insulating member.
In an example of the single battery of the present utility model, along the thickness direction of the first cover plate, the height of the insulating member is H1, the stacking thickness of the first tab is H2, and the relationship is satisfied: H1/H2 is more than or equal to 2.68 and less than or equal to 3.68.
In an example of the single battery of the present utility model, the first insulating support includes a tab folding structure for folding the first tab.
The utility model also provides a battery, which comprises the single battery of any one of the above.
The utility model also provides an electric device which comprises the single battery of any one of the above.
In the single battery, the insulating part is arranged on the side opposite to the free end of the first tab, and at least part of the insulating part covers the gap between the first insulating part and the first insulating bracket.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are necessary for the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model and that other embodiments may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is an isometric view of an overall structure of an embodiment of a cell of the present utility model;
FIG. 2 is an enlarged view of a portion of area A of FIG. 1;
FIG. 3 is a schematic cross-sectional view of one side of a first cover plate of an embodiment of a single battery according to the present utility model;
FIG. 4 is a side view of a first cover plate, a first insulator bracket, and an insulator assembly according to an embodiment of the present utility model;
FIG. 5 is an exploded view of a first cover plate, a first insulating member, a first insulating support, and an insulating member of an embodiment of a single battery according to the present utility model;
FIG. 6 is a top view of the mounting positions of the first cover plate, the first insulating member, the first insulating support and the insulating member of an embodiment of the single battery of the present utility model;
FIG. 7 is a schematic three-dimensional view of a first insulating support according to an embodiment of the present utility model;
FIG. 8 is a schematic top view of a first insulating support according to an embodiment of the present utility model;
FIG. 9 is a schematic three-dimensional view of an insulating member of an embodiment of a single battery of the present utility model;
Fig. 10 is a front view of an insulating member in an embodiment of a battery cell according to the present utility model;
FIG. 11 is an enlarged view of a portion of area B of FIG. 3;
FIG. 12 is a schematic diagram illustrating a structure of a single battery with grooves formed only in a first insulating member according to an embodiment of the present utility model;
FIG. 13 is a schematic diagram illustrating a structure of a single battery according to an embodiment of the present utility model, in which only a first insulating support is provided with a groove;
FIG. 14 is a schematic view showing a structure in which grooves are formed in both a first insulating member and a first insulating holder in an embodiment of a single battery according to the present utility model;
FIG. 15 is a schematic three-dimensional view of a first insulating member according to an embodiment of the battery cell of the present utility model;
FIG. 16 is a schematic top view of a first insulating member of an embodiment of a single battery of the present utility model;
FIG. 17 is a schematic front view of a first insulating member according to an embodiment of the present utility model;
FIG. 18 is an enlarged view of a portion of region C of FIG. 3;
FIG. 19 is a schematic view showing the structure of a battery according to an embodiment of the present utility model;
Fig. 20 is a schematic structural diagram of an embodiment of an electric device according to the present utility model.
Description of element reference numerals
1. An electric device; 10. a battery; 11. a working section; 101. a case; 1011. a first case; 1012. a second case; 100. a single battery; 110. a housing; 111. a first opening; 120. an electrode assembly; 121. a first tab; 1211. the free end of the first tab; 130. a first cover plate; 131. a first positioning structure; 132. an explosion-proof valve; 133. a liquid injection hole; 140. a first terminal; 141. a bottom plate; 150. a first insulating member; 160. a first insulating support; 161. a first tab through hole; 162. a pole ear gathering structure; 1621. a first separator; 16211. a horizontal section; 16212. bending sections; 1622. a second separator; 1623. a first tab receiving slot; 170. an insulating member; 171. a first sidewall; 180. a slit; 190. a groove; 191. a first groove portion; 192. and a second groove portion.
Detailed Description
Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. It is also to be understood that the terminology used in the examples of the utility model is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the utility model. The test methods in the following examples, in which specific conditions are not noted, are generally conducted under conventional conditions or under conditions recommended by the respective manufacturers.
Where numerical ranges are provided in the examples, it is understood that unless otherwise stated herein, both endpoints of each numerical range and any number between the two endpoints are significant both in the numerical range. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs and to which this utility model belongs, and any method, apparatus, or material of the prior art similar or equivalent to the methods, apparatus, or materials described in the examples of this utility model may be used to practice the utility model.
It should be understood that the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like are used in this specification for descriptive purposes only and not for purposes of limitation, and that the utility model may be practiced without materially departing from the novel teachings and without departing from the scope of the utility model.
In the research and development process, the inventor finds that in the existing single battery, the electrode lugs of the electrode assembly extend out of the bare cell and are electrically connected with the terminals on the cover plate, especially in the square shell cell, redundant free ends of a plurality of electrode lugs can be scattered to form a staggered end structure after welding, when the cover plate seals the shell, in order to prevent the free ends of the redundant electrode lugs from contacting the shell, an insulating piece and an insulating support are usually arranged between the cover plate and the electrode assembly, however, a butt joint gap exists between the existing insulating piece and the insulating support, and when the cover plate is welded to the shell, the free ends of the redundant electrode lugs inside the shell extend out of the gap between the insulating piece and the insulating support to contact the inner wall of the shell. Although the redundant quantity of the tab can be reduced by cutting the tab, the risk of contact between the tab and the shell is further reduced, the tab cutting can increase the working procedure and reduce the assembly efficiency on one hand, and can generate fragments in the cutting process on the other hand, the fragments can puncture the membrane of the electrode assembly after entering the shell, so that the internal short circuit of the battery is caused, and the safety of the battery is reduced. In order to solve the above problems, the inventors have provided a unit cell.
Specifically, referring to fig. 1 to 20, the present utility model firstly provides a unit cell 100, in which an insulating member 170 is disposed at a side opposite to a first tab free end 1211, and the insulating member 170 at least partially covers a gap 180 between a first insulating member 150 and a first insulating holder 160, so that the technical problem that tabs in the conventional unit cell 100 protrude from the gap 180 between the insulating member and the insulating holder to contact an inner wall of a case 110 can be improved.
Referring to fig. 2 to 6, the single battery 100 of the present utility model may be a power battery 10 or an energy storage battery 10, and the single battery 100 includes: the case 110, the first cap plate 130, the electrode assembly 120, the first terminal 140, the first insulating member 150, the first insulating holder 160, and the insulating member 170.
The case 110 has a receiving cavity formed therein, one end of the receiving cavity having a first opening 111 for receiving the electrode assembly 120, an electrolyte (not shown), and other components, and the first opening 111 for assembling the electrode assembly 120. It should be noted that, in the present utility model, the housing 110 may be provided with an opening only at one end of the accommodating cavity, or may be provided with openings at opposite ends of the accommodating cavity. The housing 110 may be of various shapes, such as approximately rectangular parallelepiped, approximately cylindrical, approximately prismatic, etc. The material of the housing 110 may be various, such as copper, iron, aluminum, steel, aluminum alloy, etc., and in order to prevent the housing 110 from rusting during long-term use, a layer of rust-preventing material, such as metallic nickel, etc., may be plated on the surface of the housing 110.
The first cover 130 is sealingly mounted to the first opening 111, and the first cover 130 may have a circular shape, a rectangular shape or other suitable shape, so as to be fixedly mounted to the housing 110 and seal the first opening 111. Specifically, considering the overall volume, the shape of the first cover 130 is preferably similar to the shape of the first opening 111, in this embodiment, referring to fig. 2 to 6, the unit battery 100 is the square-case battery 10, if the corners are not considered, the whole of the case 110 is approximately rectangular, and an approximately rectangular containing cavity is formed inside the case 110, one end of the containing cavity has an approximately rectangular first opening 111, the shape of the first cover 130 is similar to the shape of the first opening 111, and has a first positioning structure 131 matching with the inner wall and the end wall of the first opening 111, the first positioning structure 131 may be any suitable structure type capable of being positioned in a matching manner with the first opening 111, in this embodiment, the first positioning structure 131 includes a boss protruding into the first opening 111 and abutting against the inner wall of the first opening 111, by which the first cover 130 can be rapidly positioned and mounted on the first opening 111, and the first cover 130 can have higher stability in the process of further welding or sealing and bonding the first cover 130 with the case 110.
The electrode assembly 120 is a component in the cell where electrochemical reactions occur. The case 110 may contain one or more electrode assemblies 120 therein. The electrode assembly 120 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The positive electrode plate comprises a positive electrode current collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode current collector; the positive electrode current collector comprises a positive electrode coating area and a positive electrode lug connected to the positive electrode coating area, wherein the positive electrode coating area is coated with a positive electrode active material layer, and the positive electrode lug is not coated with the positive electrode active material layer. The negative electrode plate comprises a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector comprises a negative electrode coating area and a negative electrode tab connected to the negative electrode coating area, wherein the negative electrode coating area is coated with a negative electrode active material layer, and the negative electrode tab is not coated with the negative electrode active material layer. Taking the lithium ion battery 10 as an example, the material of the positive electrode current collector may be aluminum, the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The material of the anode current collector may be copper, the anode active material layer includes an anode active material, and the anode active material may be carbon or silicon, or the like. The separator may be made of PP (polypropylene) or PE (polyethylene). In order to protect and insulate the battery cell, the battery cell can be coated with an insulating film, and the insulating film can be synthesized by PP, PE, PET, PVC or other high polymer materials.
The electrode assembly 120 is accommodated in the case 110, and extends out of the first tab 121 on a side facing the first cover 130, and the first tab 121 may be the positive tab or the negative tab, which is not particularly limited herein. In this embodiment, the first tab 121 is a positive electrode tab, the first terminal 140 is fixedly mounted on the first cover plate 130, one end of the first terminal 140 facing away from the electrode assembly 120 is exposed outside the first cover plate 130 for forming an externally connected electrode, and one end of the first terminal 140 facing the electrode assembly 120 penetrates through the first cover plate 130 to be electrically connected with the first tab 121. The manner of conductive connection includes, but is not limited to, conductive soldering, conductive adhesive, etc.
Referring to fig. 3, the first insulating member 150 is mounted on a side of the first cap plate 130 facing the electrode assembly 120. The structure and the mounting manner of the first insulating member 150 are not limited, and for example, the structure and the mounting manner of the first insulating member 150 in the conventional unit battery 100 may be referred to, in this embodiment, the first terminal 140 is mounted through the first cover 130 and the first insulating member 150, the first terminal 140 includes a bottom plate 141, the bottom plate 141 is disposed on a side of the first cover 130 facing the electrode assembly 120, and the bottom plate 141 is welded to the first tab 121. The first insulating member 150 is press-fitted to the side of the first cap plate 130 facing the electrode assembly 120 through the bottom plate 141 on the first terminal 140. The first insulating member 150 may be of any suitable type of insulating material including, but not limited to, rubber, plastic.
Referring to fig. 2, 3, 7 and 8, the first insulating support 160 is disposed inside the case 110 between the first insulating member 150 and the electrode assembly 120, and specifically includes a surrounding sidewall and a first tab through hole 161 corresponding to the first tab 121, and the first tab 121 extends through the first tab through hole 161 and is electrically connected to the bottom plate 141 of the first terminal 140. The material of the first insulating support 160 includes, but is not limited to, rubber and plastic.
Referring to fig. 3, in the present utility model, an insulating member 170 is disposed on a side of the first insulating member 150 facing the free end 1211 of the first tab, and the insulating member 170 at least partially covers a gap 180 between the first insulating member 150 and the first insulating bracket 160. Specifically, the insulating member 170 may be connected to the first insulating member 150 in a variety of manners, such as a snap connection, a heat capacity connection, or a screw connection. In the present embodiment, the insulating member 170 is fixedly coupled to the first insulating member 150 by bolts for convenience of assembly and disassembly. The insulating member 170 extends from the first insulating member 150 toward the first insulating holder 160 in the thickness direction of the first cap plate 130, and at least a partial region simultaneously overlaps the first insulating member 150 and the first insulating holder 160, thereby blocking the abutting gap 180 between the first insulating member 150 and the first insulating holder 160. In another embodiment, the insulating member 170 may be connected to the first insulating holder 160; in other embodiments, the insulating member 170 may be partially connected to the first insulating member 150 and partially connected to the first insulating support 160.
The insulating member 170 may be a unitary structure or a plurality of separate structures, so long as it is ensured that the insulating member 170 at least partially shields the gap 180 between the first insulator 150 and the first insulator bracket 160. Preferably, for convenience of installation, in the present embodiment, referring to fig. 3, 4, 9 and 10, the insulating member 170 has a monolithic structure and a rectangular sheet-like structure, the long side of the insulating member 170 is parallel to the length direction of the cover plate, and the short side of the insulating member 170 is parallel to the thickness direction of the cover plate. The insulating member 170 is disposed on the opposite side of the first tab free end 1211, and the insulating member 170 at least partially covers the gap 180 between the first insulating member 150 and the first insulating support 160, so that, on one hand, the first tab free end 1211 can be prevented from protruding from the gap 180 between the first insulating member 150 and the first insulating support 160, and the first tab 121 can be prevented from contacting the housing 110, and on the other hand, the insulating member 170 can also prevent the redundant first tab 121, so that tab cutting can be avoided, thereby reducing production cost and improving safety performance of the battery 10.
It will be understood by those skilled in the art that the insulating member 170 only partially shields the slit 180 on the opposite side of the free end 1211 of the first tab, and thus can reduce the protrusion of the free end 1211 of the first tab from the slit 180 as compared with the conventional structure without the insulating member 170, but preferably, in the present embodiment, the insulating member 170 completely shields the slit 180 on the opposite side of the free end 1211 of the first tab in the width direction (as shown in the Z-axis of fig. 2) of the first tab 121.
Referring to fig. 2 and 10, in an example of the single battery 100 of the present utility model, the length dimension of the insulating member 170 is L1 along the width direction of the first tab 121, the width dimension of the first tab 121 in the corresponding region is L2, and the ratio of L1 to L2 is in the range of 0.6-1.2. If the ratio of L1 to L2 is less than 0.6, the first tab 121 cannot be completely blocked from protruding from the slit 180; if the ratio of L1 to L2 is greater than 1.2, the weight of the insulating member 170 is increased, thereby increasing the overall weight of the battery cell 100 and reducing the mass energy density of the battery cell 100. The ratio of L1 to L2 is set between 0.6 and 1.2, so that the first tab free end 1211 can be better blocked from extending out of the gap 180, and the overall weight of the single battery 100 can not be additionally increased.
Although the housing 110 may have only the first opening 111 in the present utility model, in an embodiment of the present utility model, referring to fig. 1, the housing 110 further includes a second opening opposite to the first opening 111 and disposed on the other side of the housing 110, so that an approximately rectangular channel with a bidirectional opening is formed on the housing 110, and the unit cell 100 further includes a second cover plate, and the structure of the second cover plate and the mounting structure on the housing 110 may refer to the structure of the negative side cover plate of the conventional two-way battery 10, or may be the same as the structure of the first cover plate 130 in the present utility model, so as to seal and encapsulate the second opening. In this embodiment, the packaging form of the second cover plate and the second opening may refer to the mounting form of the first cover plate 130 and the first opening 111. The electrode assembly 120 extends out of the other end facing away from the first tab 121 to form a second tab (not shown), and the polarities of the second tab and the first tab 121 are opposite, and the second tab is a negative tab and is electrically connected with the second cover plate or the second terminal on the second cover plate. In other embodiments, the first tab 121 may be a negative tab, and the second tab may be a positive tab.
Referring to fig. 3, 4 and 11, in an example of the single battery 100 of the present utility model, the insulating member 170 is disposed between the side wall of the housing 110 and the first insulating member 150, one side of the insulating member 170 facing the free end 1211 of the first tab is at least partially abutted against the outer side of the side wall of the first insulating member 150, and at least another portion is abutted against the outer side of the side wall of the first insulating bracket 160. Specifically, the insulating member 170 includes a first sidewall 171 facing the first insulating member 150, and the first sidewall 171 is simultaneously abutted against the outer sidewall of the first insulating member 150 and the outer sidewall of the second insulating bracket, so that the first sidewall 171 forms an outer shielding for the gap 180 between the first insulating member 150 and the second insulating bracket. The insulating member 170 is disposed between the sidewall of the case 110 and the first insulating member 150 such that the insulating member 170 is positioned outside the first insulating member 150, and does not interfere with the first terminal 140 inside the first insulating member 150 during the installation of the insulating member 170, but facilitates the installation of the insulating member 170 on the first insulating member 150 or the first insulating holder 160.
Referring to fig. 12, in an example of the single battery 100 of the present utility model, on a side of the first insulating member 150 and the first insulating support 160 facing the insulating member 170, a sidewall of the first insulating member 150 protrudes from a sidewall of the first insulating support 160, and a groove 190 is formed on the first insulating member 150, and a bottom wall of the groove 190 is coplanar with the sidewall of the first insulating support 160. The insulating member 170 is partially accommodated in the recess 190, abuts against the bottom wall of the recess 190, and the other portion of the insulating member 170 abuts against the side wall of the first insulating holder 160. The contour shape of the groove 190 is not limited as long as it can partially accommodate the insulating member 170. Preferably, however, the contour of the recess 190 at least partially matches the outer contour of the insulating member 170 in order to facilitate the mounting positioning of the insulating member 170 on the first insulating member 150. By providing the groove 190, not only the space occupied by the insulating member 170 in the thickness direction of the first insulating member 150 can be reduced, the energy density of the unit cell 100 can be improved, but also the mounting and positioning of the insulating member 170 can be facilitated. In another embodiment of the present utility model, referring to fig. 13, when the side wall of the first insulating support 160 protrudes from the side wall of the first insulating member 150, a groove 190 is formed on the first insulating support 160, and the bottom wall of the groove 190 is coplanar with the side wall of the first insulating member 150. In still another embodiment of the present utility model, referring to fig. 11, when the first insulating member 150 and the first insulating support 160 are coplanar toward the side of the insulating member 170, the grooves 190 are required to be formed on the sidewalls of the first insulating member 150 and the first insulating support 160.
Referring to fig. 3, 11 and 14, in an example of the single battery 100 of the present utility model, a side of the first insulating member 150 facing the insulating member 170 is coplanar with a side of the first insulating holder 160 facing the insulating member 170, and the groove 190 includes a first groove 191 portion provided on the first insulating member 150 and a second groove 192 portion provided on the first insulating holder 160, and a groove bottom wall of the first groove 191 portion is flush with a groove bottom wall of the second groove 192 portion. The gap 180 formed between the first insulator 150 and the first insulator holder 160 is located between the first groove 191 and the second groove 192. The portion of the insulating member 170 abutting against the first insulating member 150 is accommodated in the first groove 191 portion, and the portion of the insulating member 170 abutting against the first insulating holder 160 is accommodated in the second groove 192 portion, so that the insulating member 170 is shielded from the gap 180 between the first groove 191 portion and the second groove 192 portion. By the arrangement, on one hand, the installation and positioning of the insulating part 170 on the first insulating part 150 and the first insulating support 160 can be realized, and on the other hand, the installation space occupied by the insulating part 170 in the transverse direction of the single battery 100 can be reduced, so that the energy density of the single battery 100 can be improved.
The greater the thickness of the insulating member 170, the better the supporting stability of the insulating member 170, and the better the blocking effect on the redundant tabs at the slits 180, but correspondingly, the greater the installation space occupied in the thickness direction, the more unfavorable the improvement of the capacity density of the unit battery 100. Preferably, referring to fig. 11, in an example of the single battery 100 of the present utility model, the thickness of the insulating member 170 is H3, the thickness of the first insulating member 150 is H4, and 0.5H4.ltoreq.h3.ltoreq. 0.6H4. For example, H3 may be 0.5H4, 0.55H4, 0.6H4, or the like. Because when the thickness H3 of the insulating member 170 is less than 0.5H4, the supporting strength of the insulating member 170 is easily insufficient, and the strength requirement of blocking the redundant tab cannot be satisfied; when the thickness H3 of the insulating member 170 is greater than 0.6H4, the depth of the groove 190 of the first insulating member 150 is increased correspondingly under the condition that the installation space of the insulating member 170 is fixed in the thickness direction, thereby reducing the structural stability of the first insulating member 150. In this embodiment, by limiting the thickness H3 of the insulating member 170 to be 0.5H4 _h3_ 0.6H4, the insulating member 170 can have a certain supporting strength, and the depth of the groove 190 is not excessively increased, so that the structural stability of the first insulating member 150 is ensured.
Although the risk of the first tab free end 1211 protruding from the slit 180 of the single-piece first tab 121 by the insulating member 170 can be reduced in the present utility model, considering the tab structure in the conventional square-case battery 10, in an example of the single-piece battery 100 of the present utility model, referring to fig. 3, the first tab 121 includes a plurality of stacked first tabs, and the relation between the height H1 of the insulating member 170 and the stacking thickness H2 of the first tab 121 is as follows: H1/H2 is more than or equal to 2.68 and less than or equal to 3.68. When the ratio of the heights H1 and H2 of the insulating member 170 is lower than 2.68, there is still a risk that the first tab 121 is drilled out from the gap 180 between the first insulating member 150 and the first insulating holder 160; when the ratio of the heights H1 and H2 of the insulating member 170 is higher than 3.68, the height dimension (shown by the X1 axis in fig. 3) of the grooves 190 formed in the first insulating member 150 and the first insulating support 160 is larger, which affects the structural stability of the first insulating member 150 and the first insulating support 160.
Although the mounting size of the insulating member 170 in the lateral direction of the battery cell 100 can be reduced by providing the grooves 190 in the present utility model, it is preferable that the depths of the first grooves 191 and the second grooves 192 are consistent with the thickness of the insulating member 170 in an example of the battery cell 100 of the present utility model, referring to fig. 3 and 11. That is, when the insulating member 170 is mounted in the first and second grooves 191 and 192, the surface of the insulating member 170 does not protrude from the first insulating member 150 and the surface of the first insulation. By this arrangement, the installation space occupied by the insulating member 170 in the lateral direction of the unit cell 100 can be further reduced, and the volumetric energy density of the unit cell 100 can be further improved.
Referring to fig. 4, further, to facilitate the installation of the insulating member 170 in the groove 190, the length dimension (shown as the Y1 axis in fig. 4) of the groove 190 is slightly larger than the length dimension of the insulating member 170, and the height dimension (shown as the Z1 axis in fig. 4) of the groove 190 is slightly larger than the height dimension of the insulating member 170.
With continued reference to fig. 3, 11, 14, 15, 16 and 17, in an example of the single battery 100 of the present utility model, the height of the first groove 191 is equal to the height of the second groove 192 along the thickness direction (as shown by the X1 axis in fig. 3) of the first cover 130. In this way, when the insulating member 170 is mounted on the first groove 191 and the second groove 192, the gap 180 between the first insulating member 150 and the first insulating holder 160 can divide the insulating member 170 into two parts having equal heights, so that an even barrier effect can be obtained between the insulating member 170 and the first insulating member 150, and between the insulating member 170 and the first insulating holder 160, and further, the stability of the barrier effect of the insulating member 170 to the first tab free end 1211 can be improved.
Referring to fig. 3, 7, 8 and 18, in an embodiment of the battery cell 100 of the present utility model, the first insulating holder 160 includes a tab folding structure 162 for folding the first tab 121. The tab folding structure 162 may have various shapes as long as the positioning of the first tab 121 is achieved, and in the present utility model, the tab folding structure 162 includes a first spacer 1621 disposed opposite to the insulating member 170, the first spacer 1621 is fixedly disposed on the first insulating bracket 160, and the first tab 121 receiving groove is formed at a side facing the first cover 130, and the first spacer 1621 enables the first tab 121 to be tightly fixed between the first insulating bracket 160 and the bottom plate 141 of the first terminal 140 when folded and bent, thereby facilitating welding the first tab 121 to the bottom plate 141 of the first terminal 140. In another embodiment of the present utility model, the tab folding structure 162 further includes a second spacer 1622 opposite to the first spacer 1621, and the second spacer 1622 is configured to hold the first tab free end 1211 to prevent the first tab free end 1211 from being inserted into the die. Of course, those skilled in the art will appreciate that the first spacer 1621 or the second spacer 1622 may be disposed only on the first insulating support 160 without regard to the above-described superposition of advantageous effects. By providing the first and second spacers 1621 and 1622, the first tab 121 may be orderly stacked inside the case 110 by providing a guiding function for the stacking of the first tab 121 in the non-welding region.
Further, referring to fig. 3 and 18, in an embodiment of the single battery 100 of the present utility model, the first separator 1621 includes a horizontal segment 16211 and a bending segment 16212, one end of the horizontal segment 16211 is connected to the side wall of the first insulating bracket 160, the other end of the horizontal segment 16211 is connected to one end of the bending segment 16212, and the other end of the bending segment 16212 extends toward the second separator 1622 and is inclined near the first cover plate 130. An included angle alpha is formed between the horizontal section 16211 and the bending section 16212, and the included angle alpha is 140-170 degrees; for example, the included angle α may be 140 °, 150 °, 160 °, 170 °, or the like. Preferably, in this embodiment, the included angle α is 165 °. When the included angle α is smaller than 140 °, the first spacer 1621 causes local stress at the bending portion of the first tab 121 to be too high when the first tab 121 is folded, and is easy to break at the bending portion of the first tab 121; when the included angle α is greater than 170 °, the first spacer 1621 has an insufficient effect on the first tab 121. In this embodiment, the angle of the included angle α between the horizontal segment 16211 and the bending segment 16212 is set between 140 ° and 170 °, so as to achieve both the folding effect of the first tab 121 and the bending stress of the bending portion.
It should be noted that, in order to ensure the use safety of the single battery 100, an explosion-proof valve 132 is generally disposed on the first cover plate 130, where the explosion-proof valve 132 can be timely opened when the internal pressure of the single battery 100 is high, so as to implement directional explosion of the single battery 100 and reduce the risk of heat spreading caused by lateral explosion of the single battery 100; or a liquid injection hole 133 is provided in the first cap plate 130 to inject the electrolyte into the case 110. In an embodiment of the unit battery 100 of the present utility model, referring to fig. 5, in the thickness direction of the first cover 130, the projections of the first spacer 1621 and the second spacer 1622 on the first cover 130 do not overlap with the area of the explosion-proof valve 132 and the area of the liquid injection hole 133. This arrangement is such that the first and second spacers 1621, 1622 do not interfere with the normal opening of the explosion proof valve 132 and the priming efficiency of the priming orifice 133.
Referring to fig. 19, the present utility model further provides a battery 10, where the battery 10 includes any one of the single batteries 100. The battery 10 may be a battery module, a battery pack, or the like, but is not limited thereto. In one embodiment of the present utility model, the battery 10 includes a case 101 and at least one unit cell 100; the case 101 includes a first case 1011 and a second case 1012, the first case 1011 and the second case 1012 are covered with each other to form a receiving space, and a plurality of unit batteries 100 are received in the receiving space, and the plurality of unit batteries 100 may be connected in series and/or in parallel.
The utility model also provides an electric device 1, and the electric device 1 can be a vehicle, a mobile phone, portable equipment, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool and the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; the power tools include, but are not limited to, metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, electric planers, and the like.
In the power utilization device 1 of the present utility model, the power utilization device 1 includes the working portion 11 and the battery 10, and the working portion 11 is electrically connected with the battery 10 to obtain the electric energy support. The working part 11 may be a unit member capable of taking the electric power of the battery 10 and making a corresponding work, such as a blade rotation unit of a fan, a dust suction working unit of a dust collector, a wheel driving unit in an electric vehicle, and the like. The embodiment of the present utility model is not particularly limited to the above-described power consumption device 1.
Referring to fig. 20, in an embodiment of the power utilization device 1 of the present utility model, the power utilization device 1 is a vehicle, the working portion 11 is a body of the vehicle, and the battery 10 is fixedly mounted on the body, so as to provide driving force for the vehicle, thereby realizing running of the vehicle.
In the single battery 100 of the present utility model, the insulating member 170 is disposed on the opposite side of the free end 1211 of the first tab, and the insulating member 170 at least partially covers the gap 180 between the first insulating member 150 and the first insulating bracket 160, so that, on one hand, the free end 1211 of the first tab is prevented from protruding from the gap 180 between the first insulating member 150 and the first insulating bracket 160, and the first tab 121 can be prevented from contacting the housing 110, and on the other hand, the insulating member 170 can also prevent the redundant first tab 121, so that tab cutting can be avoided, thereby reducing the production cost and improving the safety performance of the battery 10. The battery 10 and the power utilization device 1 comprise the single battery 100, and have higher safety performance and lower cost. Therefore, the utility model effectively overcomes some practical problems in the prior art, thereby having high utilization value and use significance. The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (10)
1. A single cell, characterized by comprising:
a housing including a first opening;
The first cover plate is hermetically installed on the first opening;
The electrode assembly is arranged in the shell, and a first tab extends out from one side close to the first cover plate;
the first terminal is arranged on the first cover plate and is in conductive connection with the first tab;
A first insulating member installed at one side of the first cap plate adjacent to the electrode assembly;
a first insulating holder disposed between the first insulating member and the electrode assembly;
And the insulating part is arranged opposite to the free end of the first tab and at least partially covers the gap between the first insulating part and the first insulating bracket.
2. The unit cell according to claim 1, wherein the insulating member is provided between the side wall of the case and the first insulating member, and one side of the insulating member facing the free end of the first tab is at least partially abutted against the outside of the side wall of the first insulating member, and at least another part is abutted against the outside of the side wall of the first insulating holder.
3. A single cell according to claim 1, wherein the first insulating member and/or the first insulating holder is provided with a recess on a side facing the insulating member, the insulating member being at least partially accommodated in the recess.
4. A unit cell according to claim 3, wherein the groove comprises a first groove portion provided on the first insulating member and a second groove portion provided on the first insulating holder, a groove bottom wall of the first groove portion being flush with a groove bottom wall of the second groove portion.
5. The unit cell according to claim 4, wherein the first groove portion and the second groove portion are equal in height in the thickness direction of the first cap plate and are each half the height of the insulating member.
6. A cell according to claim 3, wherein the recess is at least partially provided in a side wall of the first insulator, the insulator having a thickness of 50% to 60% of the thickness of the side wall of the first insulator.
7. The unit cell according to claim 1, wherein the insulating member has a height H1 and the first tab has a stacking thickness H2 in the thickness direction of the first cap plate, satisfying the relationship: H1/H2 is more than or equal to 2.68 and less than or equal to 3.68.
8. The cell of claim 1, wherein the first insulating support comprises a tab tuck structure for tucking the first tab.
9. A battery comprising the single cell of any one of claims 1 to 8.
10. An electric device comprising the single cell according to any one of claims 1 to 8.
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CN202322900129.5U CN221239773U (en) | 2023-10-26 | 2023-10-26 | Single battery, battery and electricity utilization device |
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CN202322900129.5U CN221239773U (en) | 2023-10-26 | 2023-10-26 | Single battery, battery and electricity utilization device |
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