CN113363642B - Battery core and electricity utilization device - Google Patents
Battery core and electricity utilization device Download PDFInfo
- Publication number
- CN113363642B CN113363642B CN202110604664.9A CN202110604664A CN113363642B CN 113363642 B CN113363642 B CN 113363642B CN 202110604664 A CN202110604664 A CN 202110604664A CN 113363642 B CN113363642 B CN 113363642B
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- main body
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- 239000003292 glue Substances 0.000 claims abstract description 31
- 238000003466 welding Methods 0.000 claims abstract description 22
- 239000000853 adhesive Substances 0.000 claims abstract description 18
- 230000001070 adhesive effect Effects 0.000 claims abstract description 18
- 239000010410 layer Substances 0.000 claims description 53
- 239000004831 Hot glue Substances 0.000 claims description 16
- 239000012790 adhesive layer Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 10
- 239000002654 heat shrinkable material Substances 0.000 claims description 6
- 239000000758 substrate Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 description 14
- 238000009413 insulation Methods 0.000 description 13
- 229910000679 solder Inorganic materials 0.000 description 12
- 239000003792 electrolyte Substances 0.000 description 11
- 238000000926 separation method Methods 0.000 description 8
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/14—Primary casings; Jackets or wrappings for protecting against damage caused by external factors
-
- 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
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
- H01M50/184—Sealing members characterised by their shape or structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
- H01M50/186—Sealing members characterised by the disposition of the sealing members
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
- H01M50/19—Sealing members characterised by the material
- H01M50/197—Sealing members characterised by the material having a layered structure
-
- 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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The embodiment of the application relates to the technical field of batteries and discloses an electric core and an electric device. The battery cell comprises a shell, an electrode assembly, a tab and insulating glue. The tab comprises a connecting piece and a conductive piece which are connected with each other; one end of the connecting piece is connected with the electrode assembly, the first end of the conducting piece is welded and fixed with the other end of the connecting piece to form a first welding mark, and the second end of the conducting piece extends out of the shell. The insulating adhesive comprises a main body part which is in a closed belt shape, and the main body part is arranged around the connecting part and is fixed at the connecting part; the body portion covers at least a portion of the first weld. The battery cell covers at least part of the first welding mark through the insulating adhesive, so that the contact area between the first welding mark and the shell can be reduced or eliminated, and the potential safety hazard that the battery cell shell is possibly punctured by the first welding mark is further reduced. That is, the battery cell provided by the embodiment of the application can reduce the potential safety hazard that the shell is punctured by the tab welding and stamping.
Description
[ field of technology ]
The embodiment of the application relates to the technical field of batteries, in particular to a battery cell and an electric device.
[ background Art ]
A battery cell is a device that converts external energy into electric energy and stores the electric energy therein to supply power to external devices (e.g., portable electronic devices) at a desired time. Generally, a battery cell includes a case, an electrode assembly accommodated in the case, an electrolyte, and a tab connected to the electrode assembly.
At present, the tabs of some battery cells in the market comprise an inner tab and an outer tab. Specifically, the inner tab is connected with the electrode assembly, one end of the outer tab is welded and fixed with the inner tab, and the other end extends out of the shell.
However, the inner tab and the outer tab will form a solder mark after being welded, and the burrs of the solder mark may pierce the housing, which may cause a safety hazard in the use of the battery cell.
[ invention ]
The embodiment of the application aims to provide a battery cell and an electric device so as to reduce potential safety hazards that a shell of the battery cell is possibly punctured by welding marks on a tab at present.
In order to solve the technical problems, the embodiment of the application adopts the following technical scheme:
a battery cell comprises a shell, an electrode assembly, a tab and insulating glue. Wherein the electrode assembly is accommodated in the case. The tab comprises a connecting piece and a conductive piece which are connected with each other; one end of the connecting piece is connected with the electrode assembly, the first end part of the conductive piece is welded and fixed with the other end of the connecting piece to form a first welding mark, and the second end part of the conductive piece extends out of the shell. The insulating glue comprises a main body part, wherein the main body part is in a closed belt shape, the main body part surrounds the connection part of the connecting piece and the conductive piece and is fixed at the connection part, and the main body part covers at least part of the first welding mark.
Compared with the battery cell on the current market, the battery cell provided by the embodiment of the application further comprises insulating glue, and the insulating glue covers at least part of the first welding mark, so that the contact area between the first welding mark and the shell can be reduced or eliminated, and the potential safety hazard that the battery cell shell is possibly punctured by the first welding mark is further reduced. That is, the battery cell provided by the embodiment of the application can reduce the potential safety hazard that the shell is punctured by the tab welding and stamping.
As a further improvement of the above, the insulating glue further includes an extension group, and the extension group includes at least one extension. Along the extending track of the conductive piece, one end of the extending part is connected to one side of the main body part, which is away from the second end part, and the other end of the extending part is fixed on the electrode assembly. Thus, the insulating glue is connected with the connecting piece, the conducting piece and the electrode assembly at the same time; when the body portion has a tendency to move in a direction toward the second end of the conductive member, the electrode assembly restricts movement of the body portion in that direction. Namely, the insulating adhesive is not easy to move relative to the lugs. In addition, the insulating glue of this application embodiment links into an organic whole with multichannel offset paper, can simplify production technology, improves production efficiency, reduction in production cost.
As a further development of the above, the extension group comprises two extensions. The electrode assembly is provided with two first side surfaces which are oppositely arranged along a preset direction, and each first extension part is fixed on one first side surface.
As a further improvement of the above solution, the insulating glue further includes a protruding portion set, and the protruding portion set includes at least one protruding portion. Along the extending track of the conductive piece, the protruding part is connected to one side of the main body part, which is close to the second end part, and extends along the extending track away from the connecting part, and the protruding part is fixed on the conductive piece. Thus, when the body portion has a tendency to move in a direction away from the second end of the conductive member, the conductive member will then restrict movement of the body portion in that direction. Namely, the insulating adhesive is not easy to move relative to the lugs. In addition, the insulating glue of this application embodiment links into an organic whole with multichannel offset paper, can simplify production technology, improves production efficiency, reduction in production cost.
As a further improvement of the scheme, the battery cell comprises a plurality of lugs which are arranged in parallel. The main body part is arranged around the connection part of each tab and is fixed on each tab. When the insulating adhesive has a sliding trend at the first welding position of one tab, other tabs still have a connection relationship with the insulating adhesive, and the other tabs can prevent the insulating adhesive from sliding from the first welding position of one tab.
As a further improvement of the above solution, the electrode assembly includes a plurality of first pole piece units, a plurality of separation film units and a plurality of second pole piece units that are stacked, the first pole piece units and the second pole piece units are alternately arranged along a preset direction and have opposite polarities, and the separation film units are disposed between the first pole piece units and the second pole piece units. At least one lug is respectively connected with at least two first pole piece units, and/or at least one lug is respectively connected with at least two second pole piece units.
As a further improvement of the above solution, the insulating glue further includes a fixing portion group, and the fixing portion group includes two fixing portions. The electrode assembly is provided with two first side surfaces which are oppositely arranged along the preset direction, one end of the fixing part is connected to one side of the main body part, which is away from the second end part, along the extending track of the conductive part, and the other ends of the fixing parts are correspondingly fixed on the two first side surfaces one by one. The fixing part group can prevent the first pole piece unit, the second pole piece unit and the isolating film unit in the electrode assembly from dispersing along the preset direction.
As a further improvement of the above solution, the fixing portion includes a first portion, the first portion is located between the two first sides, and the first portion is provided with a first through hole. Electrolyte outside the electrode assembly can enter between the first pole piece unit and the second pole piece unit through the first through hole so as to enhance the infiltration effect of the electrolyte on the electrode assembly.
As a further improvement of the above, the main body portion includes a first region section, the first region section is disposed substantially perpendicular to the first pole piece unit, and the first region section is provided with a second through hole. Electrolyte outside the electrode assembly can also enter between the first pole piece unit and the second pole piece unit through the second through hole so as to further infiltrate the first pole piece unit, the second pole piece unit and the isolating membrane unit.
As a further improvement of the above, the insulating paste includes a base material layer and a fixing layer, and the insulating paste is adhered to the tab and/or the electrode assembly through the fixing layer.
As a further improvement of the above, the fixing layer includes an adhesive layer, the adhesive layer is coated on the base material layer, and the insulating adhesive is adhered to the joint through the adhesive layer; and/or the fixing layer comprises a heat-shrinkable material layer, and the fixing layer is tightly wrapped at the connecting part; and/or the fixing layer comprises a hot melt adhesive layer, the hot melt adhesive layer is tightly wrapped at the connecting part, and the hot melt adhesive layer is configured to be melted when the temperature is higher than a preset threshold value.
The other embodiment of the application also provides an electric device, which comprises any one of the electric cores. The battery core is included, so that the hidden danger that the lug of the battery core in the power utilization device is welded and printed to pierce the shell can be reduced.
[ description of the drawings ]
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to scale, unless expressly stated otherwise.
Fig. 1 is a schematic diagram of a battery cell according to an embodiment of the present disclosure;
FIG. 2 is a schematic view of the cell housing of FIG. 1;
FIG. 3 is a schematic cross-sectional view of the cell of FIG. 2 with the housing hidden along line A-A;
FIG. 4 is a schematic cross-sectional view of the cell of FIG. 2 with the housing hidden along line B-B;
FIG. 5 is a schematic view of the insulation paste of FIG. 2 in an unfolded state;
FIG. 6 is a schematic view of the insulating paste of FIG. 2;
fig. 7 is a schematic view of a battery cell with a hidden housing according to another embodiment of the present disclosure;
FIG. 8 is a schematic view of the insulation paste of FIG. 7 in an unfolded state;
fig. 9 is a schematic diagram of an electrical device according to an embodiment of the present application.
In the figure:
1. a battery cell;
100. a housing;
200. an electrode assembly; 210. a first pole piece; 220. a second pole piece; 230. a separation film; 211. a first pole piece unit; 212. a first connection unit; 221. a second pole piece unit; 222. a second connection unit; 231. a separation membrane unit; 232. a separation film connection unit; 201. a first side; 202. a second side; 2011. a first end; 2012. a second end;
300. a tab; 310. a connecting piece; 320. a conductive member; 330. a first connecting piece;
400. insulating glue; 410. a main body portion; 420. an extension group; 430. a protruding part group; 421. an extension; 431. a protruding portion; 401. a storage space; 402. a substrate layer; 403. a fixed layer;
1b, an electric core; 200b, an electrode assembly; 300b, pole lugs; 400b, insulating glue; 410b, a main body portion; 420b, an extension set; 430b, a set of protrusions; 440b, a fixed portion set; 421b, an extension; 431b, protrusions; 441b, a fixing portion; 4411b, a first through hole;
2. and (5) an electric device.
[ detailed description ] of the invention
In order to facilitate an understanding of the present application, the present application will be described in more detail below with reference to the accompanying drawings and specific examples. It will be understood that when an element is referred to as being "fixed" to "/" affixed "to" another element, it can be directly on the other element or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "vertical," "horizontal," "left," "right," "inner," "outer," and the like are used in this specification for purposes of illustration only.
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 application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.
In addition, the technical features described below in the different embodiments of the present application may be combined with each other as long as they do not collide with each other.
In this specification, the term "mounting" includes welding, screwing, clamping, adhering, etc. to fix or limit a certain element or device to a specific position or place, where the element or device may be fixed or limited to be removable or not removable, and the embodiment of the present application is not limited thereto.
Referring to fig. 1 to 3, a schematic diagram of a battery cell 1, a schematic diagram of a hidden housing of the battery cell 1, and a schematic sectional view of the hidden housing of the battery cell 1 along a line A-A of the drawings are shown, wherein the battery cell 1 includes a housing 100, an electrode assembly 200, a tab 300, and an insulating adhesive 400. The housing 100 is a mounting structure of each of the above-described structures. The electrode assembly 200 is received in the case 100. The tab 300 includes a connection member 310 and a conductive member 320 connected to each other. Wherein one end of the connection member 310 is connected to the electrode assembly 200; the first end 321 of the conductive element 320 is welded to the other end of the connecting element 310 to form a first weld, and the second end 322 of the conductive element 320 extends out of the housing 100. The insulating paste 400 includes a main body portion 410, and the main body portion 410 has a closed band shape. The main body 410 is disposed around and fixed to the connection between the connector 310 and the conductive member 320, and the main body 410 covers at least a portion of the first solder.
For the case 100, referring to fig. 1, the case 100 has a flat rectangular parallelepiped shape, and a receiving chamber (not shown) is provided in the case for receiving the electrode assembly 200 and the electrolyte. In this embodiment, the battery core 1 is a soft package battery core, and the housing 100 is an aluminum plastic film; it will be appreciated that in other embodiments of the present application, the cell 1 may also be a hard-shell cell, and accordingly, the housing 100 is a metal shell.
For the above-mentioned electrode assembly 200, please refer to fig. 3 and 4, which respectively show the schematic cut-away views of the rear edge of the housing 100 of the battery cell 1 along the line A-A and the line B-B, and with reference to the other figures, the electrode assembly 200 is accommodated in the accommodating cavity, and includes a first electrode plate unit 211, a second electrode plate unit 221, and a separation film unit 231 disposed therebetween and used for separating the two. The polarity of the first pole piece unit 211 is opposite to that of the second pole piece unit 221, one of the two is a positive pole piece unit, and the other is a negative pole piece unit. In this embodiment, the electrode assembly 200 is a coiled structure, and includes a first electrode sheet 210, a second electrode sheet 220 and a separator 230 that are stacked; the first pole piece 210 and the second pole piece 220 are arranged at intervals, an isolating film 230 is arranged between the first pole piece 210 and the second pole piece 220, and the first pole piece 210, the second pole piece 220 and the isolating film 230 are wound into a columnar structure with an oblong cross section so as to be accommodated in the accommodating cavity. The first pole piece 210 is wound to form a plurality of first pole piece units 211 extending straight and a plurality of first connecting units 212 extending curved, wherein the first pole piece units 211 and the first connecting units 212 are alternately arranged, and the plurality of first pole piece units 211 are arranged at intervals along the preset direction X. Similarly, the second pole piece 220 is wound to form a plurality of flat second pole piece units 221 and a plurality of curved second connecting units 222, the second pole piece units 221 and the second connecting units 222 are alternately arranged, and the plurality of second pole piece units 221 and the plurality of first pole piece units 211 are alternately arranged along the preset direction X. The isolating film 230 is wound to form a plurality of isolating film units 231 extending straight and a plurality of isolating film connecting units 232 extending curved, wherein the isolating film units 231 and the isolating film connecting units 232 are alternately arranged, the isolating film units 231 are arranged between the adjacent first pole piece units 211 and the adjacent second pole piece units 221, and the isolating film connecting units 232 are arranged between the adjacent first connecting units 212 and the adjacent second connecting units 222. It should be understood that, even though the electrode assembly 200 is a rolled structure in the present embodiment, the present application is not limited thereto, and in other embodiments of the present application, the electrode assembly 200 may be a stacked structure, that is, may not include the first connection unit 212, the second connection unit 222, and the separation film connection unit 232 any more, as compared to the present embodiment. It should be noted that the term "complex" as used herein means an integer greater than 1.
The electrode assembly 200 has two first side surfaces 201 disposed opposite to each other along the predetermined direction X and two second side surfaces 202 disposed opposite to each other along the illustrated setting direction Y; the two first side surfaces 201 and the two second side surfaces 202 are parallel to the axis around which the electrode assembly 200 is wound, and together enclose the above-mentioned oblong structure. The first side 201 is a planar portion of the outer surface of the electrode assembly 200, and has a first end 2011 and a second end 2012 disposed opposite to each other along a direction in which an intersection line of the first side 201 and the second side 202 extends; the second side 202 is a curved portion of the outer surface of the electrode assembly 200. The "setting direction Y" described in the present application is a direction perpendicular to the preset direction X and passing through each first connection unit 212.
The casing 100 is further filled with an electrolyte, the electrode assembly 200 is immersed in the electrolyte, and the electrolyte is used for providing a lithium ion conduction environment, so that lithium ions can be duly inserted into the first pole piece or the second pole piece, and the charging and discharging process of the battery cell 1 is realized.
For the tab 300, please refer to fig. 3, and referring to other drawings, the tab 300 is disposed near the first end 2011 and extends away from the second end 2012 of the electrode assembly 200, and includes a connecting member 310 and a conductive member 320. Wherein, the connection member 310 is received in the case 100 and connected with the electrode assembly 200; the first end 321 of the conductive element 320 is welded to the connecting element 310, and the first end 322 of the conductive element 320 passes through the housing 100 to be electrically connected to an external electrical component. In this embodiment, the battery cell 1 includes two pole ears 300, one of the two pole ears 300 is connected with the first pole piece 210, and the other is connected with the second pole piece 220; it is understood that in other embodiments of the present application, the two pole ears 300 may also be connected to the first pole piece 210, or to the second pole piece 220, which is not specifically limited in this application. In addition, even though the number of the tabs 300 is two in the present embodiment, the present application is not limited thereto, and in other embodiments of the present application, the battery cell 1 may further include only one tab 300, or include more than three tabs 300, that is, the battery cell 1 may include at least one tab 300.
For convenience of description, the tab 300 connected to the first pole piece 210 is hereinafter defined as a first tab, and the tab 300 connected to the second pole piece 220 is hereinafter defined as a second tab; next, specific structures of the first tab and the second tab are described.
The first tab includes the above-mentioned connection member 310 and the conductive member 320, the connection member 310 is connected to the plurality of first pole piece units 211, and the conductive member 320 is welded to the connection member 310 and extends to a portion extending out of the housing 100. Specifically, the connecting member 310 of the first tab includes a plurality of connecting pieces 330, where each connecting piece 330 is located on the same side of the electrode assembly 200, for example, in this embodiment, each connecting piece 330 is located at an end of the first end 2011 facing away from the second end 2012. Each connecting piece 330 corresponds to one first pole piece unit 211, and one end of each connecting piece 330 is connected with the corresponding first pole piece unit 211, and the other end extends away from the first pole piece 210. Each of the connection pieces 330 is stacked and fixed at an end facing away from the first pole piece unit 211 to form a connection portion. More specifically, the connecting piece 330 includes a fixed section, a collecting section, and a bending section that are connected in sequence. Wherein one end of the fixing section is connected with the first pole piece unit and the other end extends away from the electrode assembly 200. The collecting section extends along the preset direction X. As shown in fig. 3, the collecting segments other than the outermost collecting segment (i.e., the first collecting segment shown on the right) are all collected toward the outermost collecting segment (i.e., the first collecting segment shown on the right), and the collecting segments are welded and fixed together to form a second weld mark. One end of the bending section is connected with the collecting section, and the other end is bent in a direction away from the electrode assembly 200; along the extending path of the connecting sheet 330, the extending direction of the collecting section is opposite to that of the bending section, that is, as shown in fig. 3, the collecting section extends to the right side in the drawing, and the bending section extends to the left side in the drawing after facing away from the electrode assembly 200. The bending sections are stacked and welded to form the connecting portion. The conductive member 320 of the first tab has an overall L-shape, and includes a first conductive portion and a second conductive portion connected to each other; the first conductive part is arranged substantially in parallel with the connecting part and welded to the connecting part; the second conductive portion is bent relative to the first conductive portion, and an end of the second conductive portion facing away from the first conductive portion extends out of the housing 100.
The second tab is disposed parallel to the first tab, and has the same structure as the first tab, and also includes a corresponding connecting member 310 and a corresponding conductive member 320. The main difference between the second tab and the first tab is that: the first tab connector 310 includes a plurality of connection pieces 330, which are connected to each first pole piece unit 211 in a one-to-one correspondence; the connecting piece 310 of the second tab still includes a plurality of connecting pieces, but each connecting piece in the second tab is connected to each second tab unit in a one-to-one correspondence. In addition, the structure of the second tab is the same as that of the first tab, and will not be described in detail herein.
For the above-mentioned insulation glue 400, please refer to fig. 5, which shows a schematic diagram of the insulation glue 400 in the unfolded state, and referring to fig. 2 to 4, in this embodiment, the insulation glue 400 corresponds to the tab 300 one by one, i.e. each insulation glue 400 is respectively fixed around one tab 300. The insulating paste includes a body portion 410. The main body 410 is a closed integral band structure, that is, the main body 410 is an integral band structure, but it has no head-tail division. The main body 410 encloses a closed structure, and forms a storage space 401 at the center thereof. The body 410 is fitted into the tab 300 through the accommodation space 401; specifically, the main body 410 is disposed around and fixed to the connection between the connector 310 and the conductive member 320, and the main body 410 covers at least a portion of the first solder. In this way, the main body 410 can reduce or eliminate the contact area between the first welding burr and the housing 100, so as to reduce the risk of the first welding burr piercing the housing 100. Preferably, the body portion 410 entirely encloses the first weld arrangement described above, thereby completely separating the first weld from the housing 100. In this embodiment, the insulating glue 400 is bent along with the conductive member 320 to form an L shape, and includes a first area section and a second area section; wherein the first area section is fixed on the first conductive part and the connecting part, and is arranged substantially perpendicular to the first pole piece unit 211; the second region section is fixed on the second conductive part and is arranged basically perpendicular to the first region section. Of course, in other embodiments of the present application, the insulating glue 400 may also include only the first region segment, and not the second region segment; that is, the second zone segment is omitted. It should be noted that in actual production, absolute vertical and parallel are not present, and as long as the accuracy of the measuring tool is high enough, it can be measured that the included angle between the two components is not completely vertical or parallel; as used herein, "substantially perpendicular" means that the angle between the two components is between 80 ° and 100 °, and "substantially parallel" means that the angle between the two components is between 0 ° and 10 °.
Further, to reduce the risk that the main body 410 may be displaced relative to the tab 300, the insulation paste 400 further includes an extension group 420. Specifically, referring to fig. 5 and fig. 3, the extension set 420 includes at least one extension 421. The extending portion 421 has a non-closed band-shaped structure, and along the extending direction of the conductive member 320, one end of the extending portion 421 is connected to one side of the main body portion 410 away from the second end 322 of the conductive member 320, and the other end is fixed to the first side 201 of the electrode assembly 200. Thus, the insulating paste 400 is simultaneously connected with the connection member 310, the conductive member 320, and the electrode assembly 200; when the body portion 410 has a tendency to move in a direction approaching the second end 322 of the conductive member 320, the electrode assembly 200 restricts the movement of the body portion 410 in that direction. That is, the insulating paste 400 is not easily moved relative to the tab 300. Optionally, the extension group 420 includes two extensions 421; the two extending portions 421 extend from opposite sides of the main body 410, and each extending portion 421 is fixed to the first side 201 in a one-to-one correspondence. Preferably, the portion of the extension 421 located between the body part 410 and the electrode assembly 200 is fixed to the outermost connection pad surface, thereby further enhancing the fixing effect of the extension 421. Specifically, referring to fig. 3, one extension 421 is fixed to the surface of the rightmost connecting piece in the drawing, and the other extension 421 is fixed to the surface of the leftmost connecting piece in the drawing. This arrangement enhances the securing effect of the extension 421 on the one hand and also separates the tabs 330 from the housing 100 on the other hand, avoiding the edges of the tabs or the second weld formed between the tabs from piercing the housing 100.
Further, to further reduce the risk of the body portion 410 being displaced relative to the tab 300, the insulation paste 400 further includes a protruding portion set 430. Specifically, with continued reference to fig. 5 and 3, the protrusion set 430 includes at least one protrusion 431. The protruding portion 431 has a non-closed band-shaped structure and is fixed to the conductive member 320. Along the extending track of the conductive element 320, the protruding portion 431 is connected to a side of the main body portion 410 near the second end of the conductive element 320, and the protruding portion 431 extends away from the connection portion between the conductive element 320 and the connecting element 310 along the extending track of the conductive element 320. Thus, when the body portion 410 has a tendency to move in a direction away from the second end of the conductive member 320, the conductive member 320 restricts movement of the body portion 410 in that direction. That is, the insulating adhesive 400 is not easy to move relative to the tab. Optionally, the protruding portion set 430 includes two protruding portions 431, and the two protruding portions 431 jointly wrap the portion of the conductive element 320 between the main body portion 410 and the housing 100.
Next, a specific material configuration of the insulating paste 400 will be described. Specifically, referring to fig. 6, a schematic structural diagram of an insulating paste 400 is shown, and in combination with other figures, the insulating paste 400 includes a substrate layer 402 and a fixing layer 403. Wherein, the base material layer 402 is a base material layer for coating or carrying the fixing layer 402, and is disposed away from the tab 300 or the electrode assembly 200 along the thickness direction of the insulating paste 400. Optionally, the substrate layer 402 comprises at least one of polyethylene terephthalate, polyvinyl chloride, and nylon. The fixing layer 403 is disposed on the surface of the substrate layer 402 facing the tab 300 or the electrode assembly 200, and is a material layer directly fixed on the tab 300 and the electrode assembly 200 on the insulating adhesive 400; that is, the insulation paste 400 is fixed to the tab 300 and/or the electrode assembly 200 through the fixing layer 403. In this embodiment, the fixing layer 403 includes an adhesive layer; the adhesive is coated on a side of the base material layer 402 facing the tab 300 and/or the electrode assembly 200 in the thickness direction of the insulating paste 400. The main body 410 is adhered to the connection portion between the connector 310 and the conductive member 320 by an adhesive layer to cover at least a portion of the first solder; the extension 421 is adhered to the electrode assembly 200 by an adhesive layer; the protruding portion 431 is adhered to the conductive member 320 by an adhesive layer. Optionally, the adhesive layer comprises at least one of epoxy, polyester, polyurethane, polyesterimide, and polyimide.
It is understood that even though the insulating paste 400 in the present embodiment is fixed to the tab 300 and the electrode assembly 200 by the adhesive layer, the present application is not limited thereto. For example, in other embodiments of the present application, the securing layer 403 comprises a hot melt adhesive layer that is tightly wrapped around the junction and configured to melt at a temperature above a preset threshold; in this way, the hot-melt adhesive layer can be melted and cover the junction to cover at least part of the solder by heating the cell 1 itself above the preset threshold. The extension 421 and the protrusion 431 may be fixed at the corresponding positions by adhesion or the like. The preset threshold value is a temperature when the hot melt adhesive layer is heated to just melting; that is, when the temperature is above the preset threshold, the hot melt adhesive layer has melted. Optionally, the hot melt adhesive layer comprises an ethylene vinyl acetate copolymer. Wherein, the ethylene-vinyl acetate copolymer is a material widely applied to hot melt adhesives, and the melting point of the ethylene-vinyl acetate copolymer can be changed along with the content of vinyl acetate; for example: in the embodiment, the content of the vinyl acetate is 18%, and the melting point of the hot melt adhesive layer is about 80 ℃; in other embodiments, the vinyl acetate content may be 14%, and correspondingly, the melting point of the hot melt adhesive layer is about 90 ℃; in other embodiments, the vinyl acetate content may be 28%, and correspondingly, the melting point of the hot melt adhesive layer is about 70 ℃; not described in detail herein, a designer can adjust the vinyl acetate content according to the use temperature of the battery cell 1 under the normal working condition. Of course, in other embodiments of the present application, the hot melt adhesive layer may also include other thermoplastic resins such as polyamides, polyesteramides, and polyethylene. As for the process of heating the battery cell 1, it may be a formation process in the manufacturing process of the battery cell 1, or may be a process of heating alone after the battery cell 1 is completely manufactured.
For another example, in other embodiments of the present application, the securing layer 403 includes a layer of heat-shrinkable material configured to shrink in volume when the temperature is above a set threshold; in this way, the heat-shrinkable material layer can be shrunk and wrapped around the junction to cover at least part of the solder print by heating the cell 1 itself above the set threshold. The extension 421 and the protrusion 431 may be fixed at the corresponding positions by adhesion or the like. Wherein, the 'set threshold' is the temperature when the heat shrinkage material layer is heated to the temperature just when shrinkage happens; that is, when the temperature is above the set threshold, the layer of heat shrinkable material has shrunk. It is worth noting that in the finished product of the cell 1, the heat-shrinkable material layer is already in a shrunk state.
The battery cell 1 provided in the embodiment of the application includes a housing 100, an electrode assembly 200, a tab 300, and an insulating adhesive 400. The tab 300 includes a connection member 310 and a conductive member 320, the connection member 310 is connected with the electrode assembly 200, and the conductive member 320 is welded to the connection member 310 to form a first weld. The insulating paste 400 includes a body portion 410 having a closed band shape, and the body portion 410 is disposed around the connection portion of the connection member 310 and the conductive member 320 and covers at least a portion of the first solder mark formed by the connection member 310 and the conductive member 320.
Compared with the battery cell 1 on the market at present, the battery cell 1 provided by the embodiment of the application further comprises the insulating glue 400, and the insulating glue 400 covers at least part of the welding mark, so that the contact area between the welding mark and the shell 100 can be reduced or eliminated, and the potential safety hazard that the battery cell 1 is possibly punctured by the welding mark of the tab 300 is further reduced.
In other embodiments of the present application, the main body of the insulating glue 400 may also be a non-closed strip structure, which is fixed at the connection between the connecting member 310 and the conductive member 320 and covers at least a portion of the first solder. At this time, the shape of the main body portion is similar to the extension portion 421 (or the protruding portion 431) in the above-described embodiment. However, compared with the main body 410 in the above embodiment, the edge portion of the main body of this type is easily separated from the connection portion due to the loss of the adhesiveness, and the main body is easily separated from the connection portion. The closed main body 410 is sleeved and fixed at the connection part of the connecting piece 310 and the conductive piece 320, and is arranged at the connection part in a wrapping manner; when the fixing effect of a certain portion of the main body 410 is reduced, the peripheral portion thereof maintains a better fixing effect, so as to avoid the separation of the certain portion from the tab 300, thereby prolonging the effective fixing time between the main body 410 and the tab 300. In addition, the main body 410 is mounted to the tab by being fitted into the tab 300, which is also convenient. In addition, the insulating glue 400 of the embodiment of the application is formed by connecting a plurality of glue papers into a whole, so that the production process can be simplified, the production efficiency can be improved, and the production cost can be reduced.
It should be understood that even though the insulation paste 400 in the above embodiment corresponds to the tabs 300 one by one, the present application is not limited thereto. For example, please refer to fig. 7 and 8, which respectively show a schematic view of a battery cell 1b provided in another embodiment of the present application after the housing is hidden and a schematic view of an insulating adhesive in an unfolded state, and referring to fig. 1 to 6, the battery cell 1b includes a housing, an electrode assembly 200b, a tab 300b and an insulating adhesive 400b, and the housing, the electrode assembly 200b and the tab 300b are respectively identical to corresponding component structures in the battery cell 1, which is not repeated herein; the main difference between the cell 1b and the cell 1 in the above embodiment is that:
the insulating glue 400 in the battery cell 1 corresponds to the electrode lugs 300 one by one, namely, each insulating glue 400 is sleeved on one electrode lug 300; the insulating glue 400b in the battery cell 1b corresponds to the two tabs 300b, i.e. the insulating glue 400b is sleeved on the two tabs 300b.
Specifically, the insulating paste 400 includes a main body portion 410b, an extension portion group 420, and a protrusion portion group 430. The main body 410b has a closed band structure, surrounds the two lugs 300b at the connection part of the connecting piece and the conductive piece, and is fixed on the two lugs 300b; the main body 410b covers at least a portion of the first solder joint formed by the connecting member and the conductive member. The extension groups 420b are in one-to-one correspondence with the tabs 300b. Each of the extension groups 420b includes two extension portions 421b, each extension portion 421b extending from the main body portion 410b to the surface of the electrode assembly 200b, respectively; two extensions 421 in the same extension group 420 are respectively fixed to different first sides 201b. Similarly, the protruding portion groups 430b are in one-to-one correspondence with the tabs 300b. Each protruding portion group 430b includes two protruding portions 431b, and each protruding portion 431b extends from the main body portion 410b toward a direction approaching the second end of the conductive member; the two protruding portions 431b in the same protruding portion set 430b together wrap the portion of the conductive element between the main body portion 410b and the housing.
Compared with the battery cell 1 in the above embodiment, the insulating glue 400b in the battery cell 1b in the present embodiment is simultaneously connected to the plurality of tabs 300b, so that the fixing effect is better. Specifically, when the insulation paste 400b has a sliding tendency at the first solder joint of one of the tabs 300b, the other tabs 300b still have a connection relationship with the insulation paste 400b, and the other tabs 300b prevent the insulation paste 400 from sliding away from the first solder joint of the "one tab 300 b".
Further, in order to avoid the mutual dispersion of the first electrode sheet unit 211b, the second electrode sheet unit 221b and the separator unit 231b in the electrode assembly 200b along the predetermined direction X, the insulating paste 400b further includes a fixing portion group 440b. Specifically, the fixing portion group 440b includes two fixing portions 441b; along the extending track of the conductive member, one end of the fixing portion 441b is connected to a side of the main body portion 410 away from the second end, and the other end of the fixing portion is fixed to the first side 201b; the two fixing portions 441b are fixed to the two first side surfaces 201b in a one-to-one correspondence. Preferably, the fixing portion 441b includes a first portion, which corresponds to the first region segment, is located between the two first sides 201 and is substantially perpendicular to the first pole piece unit 211; the first portion is provided with a first through hole 4411b. Electrolyte outside the electrode assembly 200 may enter between the first and second electrode tab units through the first through-holes 4411 b; that is, the provision of the first through holes 4411b is advantageous in enhancing the wetting effect of the electrolyte to the electrode assembly 200. Further, the first region of the main body 410 is provided with a second through hole; electrolyte outside the electrode assembly 200 may also enter between the first and second electrode sheet units through the second through hole to further infiltrate the first and second electrode sheet units and the separator unit.
It should be understood that, even though the main body 410b is sleeved on two tabs 300b with opposite polarities in the present embodiment, in other embodiments of the present application, the main body 410b may also be sleeved on two tabs with the same polarity. For example, the battery core comprises two first lugs which are arranged in parallel, and the main body part of the insulating adhesive is sleeved on the two first lugs at the same time; for another example, the battery core includes two second lugs arranged in parallel, and the main body part of the insulating glue is sleeved on the two second lugs at the same time.
It should be further understood that, even though the main body 410b is sleeved on two lugs in the present embodiment, in other embodiments of the present application, the main body 410b may be sleeved on more than three lugs simultaneously; as for the polarity relationship between the three or more tabs, examples thereof are various, and the present application is not limited thereto.
Based on the same inventive concept, the application also provides an electric device. Referring to fig. 9, a schematic diagram of an electrical device 2 according to one embodiment of the present application is shown, where the electrical device 2 includes the electrical core described in any of the foregoing embodiments. In this embodiment, the power consumption device 2 is a mobile phone; it will be appreciated that in other embodiments of the present application, the power consumption device 2 may be a tablet computer, a computer, an unmanned aerial vehicle, or other power consumption devices that need to be driven by electricity.
Due to the inclusion of the battery core, the power utilization device 2 can also reduce the hidden trouble that the lug of the battery core in the power utilization device is welded and printed to pierce the shell, simplify the production process, improve the production efficiency and reduce the production cost.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; the technical features of the above embodiments or in the different embodiments may also be combined under the idea of the present application, the steps may be implemented in any order, and there are many other variations of the different aspects of the present application as described above, which are not provided in details for the sake of brevity; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A cell, comprising:
a housing;
an electrode assembly housed in the case;
the electrode lug comprises a connecting piece and a conductive piece which are connected with each other, one end of the connecting piece is connected with the electrode assembly, a first end part of the conductive piece is welded and fixed with the other end of the connecting piece to form a first welding mark, and a second end part of the conductive piece extends out of the shell; and
the insulating adhesive comprises a main body part, an extension part group and a protruding part group, wherein the main body part is in a closed belt shape, the main body part surrounds the joint of the connecting piece and the conductive piece and is fixed at the joint, the main body part covers at least part of the first welding mark, the extension part group comprises at least one extension part along the extension track of the conductive piece, one end of the extension part is connected to one side of the main body part, which is away from the second end, and the other end of the extension part is fixed at the electrode assembly;
the protruding portion group comprises a protruding portion, the protruding portion is connected to one side, close to the second end portion, of the main body portion along the extending track of the conductive piece, the protruding portion extends away from the connecting portion along the extending track, and the protruding portion is fixed to the conductive piece.
2. The cell of claim 1, wherein the set of extensions comprises two extensions;
the electrode assembly is provided with two first side surfaces which are oppositely arranged along a preset direction, and each first extension part is fixed on one first side surface.
3. The cell of claim 1, wherein the cell comprises a plurality of tabs arranged in parallel;
the main body part is arranged around the connection part of each tab and is fixed on each tab.
4. The cell according to any one of claims 1 to 3, wherein the electrode assembly comprises a plurality of first electrode sheet units, a plurality of separator film units and a plurality of second electrode sheet units which are stacked, the first electrode sheet units and the second electrode sheet units are alternately arranged along a preset direction and have opposite polarities, and the separator film units are arranged between the first electrode sheet units and the second electrode sheet units;
at least one lug is respectively connected with at least two first pole piece units, and/or at least one lug is respectively connected with at least two second pole piece units.
5. The cell of claim 4, wherein the insulating glue further comprises a set of fixing portions, the set of fixing portions comprising two fixing portions;
the electrode assembly is provided with two first side surfaces which are oppositely arranged along the preset direction, one end of the fixing part is connected to one side of the main body part, which is away from the second end part, along the extending track of the conductive part, and the other ends of the fixing parts are correspondingly fixed on the two first side surfaces one by one.
6. The cell of claim 5, wherein the fixing portion comprises a first portion, the first portion is located between the two first sides, and the first portion is provided with a first through hole.
7. The cell of claim 6, wherein the body portion comprises a first region segment disposed substantially perpendicular to the first pole piece unit, the first region segment having a second through hole.
8. The cell according to any one of claims 1 to 4, wherein the insulating paste comprises a base material layer and a fixing layer, and the insulating paste is adhered to the tab and/or the electrode assembly through the fixing layer.
9. The cell of claim 8, wherein the cell comprises a plurality of conductive traces,
the fixing layer comprises an adhesive layer, the adhesive layer is coated on the substrate layer, and the insulating adhesive is adhered to the connecting part through the adhesive layer; and/or the number of the groups of groups,
the fixing layer comprises a heat-shrinkable material layer, and is tightly wrapped at the joint; and/or the number of the groups of groups,
the fixing layer comprises a hot melt adhesive layer, the hot melt adhesive layer is tightly wrapped at the joint, and the hot melt adhesive layer is configured to melt when the temperature is higher than a preset threshold value.
10. An electrical device comprising a cell as claimed in any one of claims 1 to 9.
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| CN113903969B (en) * | 2021-09-23 | 2022-07-08 | 宁德新能源科技有限公司 | Battery cell and power utilization device |
| WO2023123410A1 (en) * | 2021-12-31 | 2023-07-06 | 东莞新能源科技有限公司 | Battery cell, battery, and electrical device |
| EP4369479A4 (en) * | 2022-01-07 | 2024-11-06 | Contemporary Amperex Tech Hong Kong Limited | Battery cell, manufacturing method and manufacturing device therefor, battery, and electrical device |
| WO2024065362A1 (en) * | 2022-09-29 | 2024-04-04 | 宁德新能源科技有限公司 | Electrochemical apparatus and electric device |
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