CN114865236B - Battery cell and battery - Google Patents
Battery cell and battery Download PDFInfo
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- CN114865236B CN114865236B CN202110077420.XA CN202110077420A CN114865236B CN 114865236 B CN114865236 B CN 114865236B CN 202110077420 A CN202110077420 A CN 202110077420A CN 114865236 B CN114865236 B CN 114865236B
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- 239000000853 adhesive Substances 0.000 claims description 6
- 230000001070 adhesive effect Effects 0.000 claims description 6
- 230000013011 mating Effects 0.000 claims 2
- 239000000463 material Substances 0.000 description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 239000000565 sealant Substances 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 229920002292 Nylon 6 Polymers 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000002654 heat shrinkable material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Sealing Battery Cases Or Jackets (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The embodiment of the application relates to the technical field of batteries and discloses a battery cell and a battery. The battery cell comprises a shell, an electrode assembly, a tab and a first thermal deformation piece. The electrode assembly is accommodated in the case. The tab includes a first conductive portion and a second conductive portion. The first conductive part is accommodated in the shell and is connected with the electrode assembly; a part of the second conductive part is accommodated in the shell and connected with the first conductive part, and a part of the second conductive part extends out of the shell. The first thermal deformation piece is accommodated in the shell and fixed with the shell, one of the first conductive part and the second conductive part is fixed with the first thermal deformation piece, and the first thermal deformation piece is used for shrinking or expanding when the temperature of the battery cell is greater than a preset threshold value so as to disconnect the first conductive part from the second conductive part. When the temperature of the battery cell is greater than a preset threshold value, the first conductive part and the second conductive part inside the tab are disconnected, namely the battery cell can be automatically disconnected when the temperature is higher than a certain specific value.
Description
[ field of technology ]
The embodiment of the application relates to the technical field of batteries, in particular to a battery cell and a battery.
[ 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. At present, the battery cell is widely applied to electronic products such as mobile phones, flat plates, notebook computers and the like.
Generally, the battery cell includes a case, an electrode assembly received in the case, and a tab connected to the electrode assembly and partially protruding from the case. Specifically, the above-described electrode assembly generally includes positive and negative electrode sheets alternately arranged in a cycle, and a separator provided therebetween for separating the two; one end of the tab is connected with the pole piece (positive pole piece or negative pole piece), and the other end extends out of the shell.
The inventors of the present application found in the course of implementing the present application that: the electric core can not appear overcharging and other thermal runaway phenomena in the process of application, but the electric core at present can not spontaneously realize circuit breaking when the temperature is higher than a certain preset value, so that the electric core still continuously generates heat after being out of control, and accidents such as explosion can be caused, and serious potential safety hazards are caused for users.
[ invention ]
The embodiment of the application aims to provide a battery cell and a battery, so as to solve the technical problem that the battery cell cannot break automatically when the temperature is higher than a certain preset value.
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 a first thermal deformation piece. Wherein the electrode assembly accommodates the case. The tab includes a first conductive portion and a second conductive portion; the first conductive part is accommodated in the shell and is connected with the electrode assembly; and part of the second conductive part is accommodated in the shell and connected with the first conductive part, and part of the second conductive part extends out of the shell. The first thermal deformation piece is accommodated in the shell and fixed with the shell, one of the first conductive part and the second conductive part is fixed with the first thermal deformation piece, and the first thermal deformation piece is used for shrinking or expanding when the temperature of the battery cell is greater than a preset threshold value so as to disconnect the first conductive part from the second conductive part.
As a further improvement of the above solution, the first heat deformation member is a heat shrinkage member, and the first heat deformation member is configured to shrink when the temperature of the battery cell is greater than the preset threshold value, so as to disconnect the first conductive portion from the second conductive portion.
As a further improvement of the above solution, the battery cell further includes a second heat deformation member; the first thermal deformation piece is fixed with the first conductive part; the second thermal deformation piece is accommodated in the shell and fixed with the shell, and the second thermal deformation piece is fixed with the second conductive part; the second thermal deformation piece is used for shrinking when the temperature of the battery cell is larger than the preset threshold value so as to be matched with the first thermal deformation piece together to drive the first conductive part and the second conductive part to be disconnected.
As a further improvement of the above solution, the first conductive part includes a first connection part, the second conductive part includes a second connection part, and the first connection part is in plug-in fit with the second connection part; along the plug-in matching direction of the first connecting part and the second connecting part, the first thermal deformation piece and the second thermal deformation piece are fixed on two side walls which are oppositely arranged on the shell in a one-to-one correspondence manner, and the first connecting part and the second connecting part are both positioned between the first thermal deformation piece and the second thermal deformation piece.
As a further improvement of the above solution, the first heat deformation member and the second heat deformation member are heat shrinkage tubes; one end of the first thermal deformation piece is fixed with the shell, and the other end of the first thermal deformation piece is fixed with the first conductive part; one end of the second thermal deformation piece is fixed with the shell, and the other end of the second thermal deformation piece is fixed with the second conductive part.
As a further improvement of the above solution, the extending directions of the first thermal deformation member and the second thermal deformation member are respectively parallel to the plugging direction.
As a further improvement of the above solution, the first connection portion extends in a straight line, the second connection portion includes two clamping members symmetrically arranged, each clamping member portion protrudes toward the other clamping member, and the first connection portion is clamped between the two clamping members; or the second connecting part extends in a straight line, the first connecting part comprises two clamping pieces which are symmetrically arranged, each clamping piece part protrudes towards the other clamping piece, and the second connecting part is clamped between the two clamping pieces.
As a further improvement of the above solution, the first conductive portion and the second conductive portion are fixedly connected by conductive adhesive.
As a further improvement of the above aspect, the battery cell further includes a second heat deformation member, the second heat deformation member is accommodated in the housing and fixed with the housing, and the other of the first conductive portion and the second conductive portion is fixed with the second heat deformation member; the first thermal deformation piece and the second thermal deformation piece are thermal expansion pieces, the thermal expansion pieces are used for expanding when the temperature of the battery cell is larger than the preset threshold, and the first thermal deformation piece and the second thermal deformation piece are matched together when the temperature of the battery cell is larger than the preset threshold to drive the first conductive part and the second conductive part to be disconnected.
As a further improvement of the above aspect, the battery cell further includes a second heat deformation member, the second heat deformation member is accommodated in the housing and fixed with the housing, and the other of the first conductive portion and the second conductive portion is fixed with the second heat deformation member;
one of the first thermal deformation piece and the second thermal deformation piece is a thermal expansion piece, the other one is a thermal shrinkage piece, the thermal expansion piece is used for expanding when the temperature of the battery cell is larger than the preset threshold value, the thermal shrinkage piece is used for contracting when the temperature of the battery cell is larger than the preset threshold value, and the first thermal deformation piece and the second thermal deformation piece are used for cooperatively driving the first conductive part and the second conductive part to be disconnected when the temperature of the battery cell is larger than the preset threshold value.
The embodiment of the application also provides a battery, which comprises the battery cell of any one of the above.
The embodiment of the application also provides an electric device, which comprises the battery of any one of the above.
The beneficial effects of this application are:
the battery cell provided by the embodiment of the application comprises a shell, an electrode assembly, a tab and a first thermal deformation piece. Wherein the electrode assembly is accommodated in the case. The tab includes a first conductive portion and a second conductive portion. The first conductive part is accommodated in the shell and is connected with the electrode assembly; a part of the second conductive part is accommodated in the shell and connected with the first conductive part, and a part of the second conductive part extends out of the shell. The first thermal deformation piece is accommodated in the shell and fixed with the shell, one of the first conductive part and the second conductive part is fixed with the first thermal deformation piece, and the first thermal deformation piece is used for shrinking or expanding when the temperature of the battery cell is greater than a preset threshold value, so that one of the first conductive part and the second conductive part, which is fixed with the first thermal deformation piece, moves or deforms along with the one of the first conductive part and the second conductive part, and further the connection between the first conductive part and the second conductive part is disconnected.
Compared with the battery cell on the current market, when the temperature of the battery cell is greater than a preset threshold value, the first conductive part and the second conductive part inside the tab are disconnected, namely the battery cell can be automatically disconnected when the temperature is higher than a certain value. The worker can design the preset threshold value to be a proper temperature value lower than the thermal runaway temperature, so that the first conductive part and the second conductive part are separated before the thermal runaway occurs, and the potential safety hazard that the battery cell may explode is eliminated.
[ 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 cross-sectional view of a battery cell according to one embodiment of the present disclosure;
FIG. 2 is a schematic cross-sectional view of a cell according to another embodiment of the present disclosure;
FIG. 3 is a schematic cross-sectional view of a battery cell according to another embodiment of the present disclosure;
fig. 4 is a schematic cross-sectional view of a battery cell according to another embodiment of the present application.
[ 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, a schematic cross-sectional view of a battery cell 1 according to one embodiment of the present application is shown, where the battery cell 1 includes a case 100, an electrode assembly 200, a tab 300, and a first heat deformation member 400. The housing 100 is a mounting support base for the above components. The electrode assembly 200 is received in the case 100. The tab 300 includes a first conductive portion 310 and a second conductive portion 320, and the first conductive portion 310 is received in the case 100 and connected to the electrode assembly 200. A portion of the second conductive portion 320 is accommodated in the housing 100 and connected to the first conductive portion 310, and a portion of the second conductive portion 320 extends out of the housing 100. The first thermal deformation member 400 is accommodated in the housing 100 and fixed to the housing 100. One of the first conductive part 310 and the second conductive part 320 is fixed to the first thermal deformation member 400, and the first thermal deformation member 400 is used for shrinking or expanding when the temperature of the battery cell is greater than a preset threshold value, so that the first conductive part 310 and the second conductive part 320 are disconnected. Wherein, the "preset threshold" is a preset temperature value. Next, the specific structures of the case 100, the electrode assembly 200, the tab 300, and the first heat deformable member 400 will be described in order using the battery cell 1 as a soft package battery cell; it should be understood that in other embodiments of the present application, the cell 1 may also be a hard-shell cell, such as a steel-shell battery.
For the above-mentioned case 100 and electrode assembly 200, referring to fig. 1, the case 100 is provided with a receiving cavity 101, and the receiving cavity 101 is used for receiving the electrode assembly 200, the first conductive portion 310, the portion of the second conductive portion 320, and the first thermal deformation member 400. The electrode assembly 200 is wound in a specific shape, such as a nearly cylindrical shape, a nearly elliptic cylindrical shape, etc., including a positive electrode sheet, a separator, a negative electrode sheet, and another separator, which are sequentially stacked.
For the tab 300, please continue to refer to fig. 1, which is connected to the positive electrode tab or the negative electrode tab in the electrode assembly 200, so that the tab 300 forms the external terminal of the battery cell 1. Specifically, the tab 300 includes a first conductive portion 310 and a second conductive portion 320. The first conductive part 310 is accommodated in the accommodation chamber 101 and is connected to the electrode assembly 200. The second conductive part 320 includes two parts, wherein one part is accommodated in the accommodating cavity 101 and is connected with the first conductive part 310; another part of which passes through the case 100 and protrudes outside the case 100, thereby forming an external terminal of the battery cell 1. Accordingly, the case 100 is provided with a through hole through which the second conductive part 320 passes; the cell 1 further includes a sealant 102, where the sealant 102 is disposed at the through hole to seal the through hole.
For the first heat deformable member 400, please continue to refer to fig. 1, which is accommodated in the accommodating cavity 101 and fixed with the housing 100; meanwhile, the first thermal deformation member 400 is also fixed to one of the first conductive portion 310 and the second conductive portion 320. The first thermal deformation member 400 is made of a heat shrinkage material or a heat expansion material for shrinking or expanding when the temperature of the battery cell 1 is greater than a preset threshold value, so that the first conductive portion 310 is separated from the second conductive portion 320 at the connection point, that is, the first conductive portion 310 is disconnected from the second conductive portion 320. It should be noted that, as used herein, the term "heat-shrinkable material" refers to a material that shrinks in volume with increasing temperature; as used herein, "thermally expandable material" refers to a material that expands in volume with increasing temperature.
In this embodiment, the first heat deformation member 400 is a heat shrinkage member made of a heat shrinkage material, and is fixed to the first conductive portion 310 and located at a side of the first conductive portion 310 away from the connection between the first conductive portion 310 and the second conductive portion 320. The first thermal deformation member 400 is configured to shrink when the temperature of the battery cell 1 is greater than the preset threshold, and further drive the first conductive portion 310 to move or deform near the housing, so as to disconnect the first conductive portion 310 from the second conductive portion 320. Alternatively, the first heat deformable member 400 is a heat shrinkable tube, one end of which is fixed to the housing 100, and the other end of which is fixed to the first conductive portion 310. Optionally, the first heat deformable member 400 is made of polyvinyl chloride and/or polypropylene, which undergoes volume shrinkage during temperature rise.
Further, in order to enable the first conductive portion 310 and the second conductive portion 320 to be disconnected more reliably when the temperature is higher than the preset threshold, the battery cell 1 further includes a second thermal deformation member 500. Specifically, referring to fig. 1, the second thermal deformation member 500 is accommodated in the accommodating cavity 101 and is fixed to the housing 100; meanwhile, the second thermal deformation member 500 is fixed to the second conductive part 320. The second heat deformation member 500 is made of a heat shrinkage material or a heat expansion material, and is used for shrinking or expanding when the temperature of the battery cell 1 is greater than a preset threshold value, and is matched with the first heat deformation member to drive the first conductive part 310 and the second conductive part 320 to be separated at the connection position, that is, the first conductive part 310 and the second conductive part 320 are disconnected.
In this embodiment, the second heat deformation member 500 is a heat shrinkage member made of a heat shrinkage material, and is fixed to the second conductive portion 320 and located at a side of the second conductive portion 320 away from the connection between the first conductive portion 310 and the second conductive portion 320. The second thermal deformation member 500 is configured to shrink when the temperature of the battery cell 1 is greater than the preset threshold, and further drive the second conductive portion 320 to deform away from the first conductive portion 310, so that the first conductive portion 310 is disconnected from the second conductive portion 320. Alternatively, the second heat deformable member 500 is a heat shrinkable tube, one end of which is fixed to the housing 100, and the other end of which is fixed to the second conductive portion 320. Optionally, the second heat deformable member 500 is made of polyvinyl chloride and/or polypropylene, which undergoes volume shrinkage during temperature rise.
To ensure that the first conductive portion 310 and the second conductive portion 320 can be smoothly disconnected when the temperature is higher than the preset threshold, the connection strength between the first conductive portion 310 and the second conductive portion 320 cannot be excessively high. In this embodiment, the first conductive portion 310 and the second conductive portion 320 are in plug-fit. Specifically, the first conductive portion 310 includes a first extension portion 311 and a first connection portion 312, where the first connection portion 312 is connected to the first extension portion 311 in a bending manner. Wherein, the first extension portion 311 is fixedly connected with the first heat deformation member 400; the first connecting portion 312 is connected to one end of the first extension portion 311 and extends away from the first heat deformable member 400. The second conductive portion 320 includes a second extension portion 321 and a second connection portion 322. The second extending portion 321 is disposed in a zigzag shape, and one end thereof extends out of the housing 100, and the other end thereof is accommodated in the housing 100. The second connecting portion 322 is connected to one end of the second extending portion 321 received in the housing 100, and is integrally configured in a Y shape, and includes two clamping members 323 and a connecting member 324. The two holding members 323 are symmetrically arranged, and each holding member 323 protrudes towards the other holding member 323, and a V-shaped groove is formed on one side away from the other holding member 323. The connecting piece 324 is in a T shape as a whole, and two ends thereof are respectively connected with the ends of a clamping piece 323 in a one-to-one correspondence manner, and the other end is connected with the second extending portion 321. One end of the first connecting portion 312 extends between the two clamping members 323 through one side of the two clamping members 323 away from the connecting member 324, and is clamped between the two clamping members 323, so that the first conductive portion 310 is in plug-in fit with the second conductive portion 320.
Preferably, along the plugging direction of the first connecting portion 312 and the second connecting portion 322, the first thermal deformation member 400 and the second thermal deformation member 500 are respectively fixed on two sidewalls of the housing 100 disposed opposite to each other along the plugging direction in a one-to-one correspondence manner, and extend parallel to the plugging direction, and the first connecting portion 312 and the second connecting portion 322 are respectively located between the first thermal deformation member 400 and the second thermal deformation member 500. The direction in which the first thermal deformation member 400 and the second thermal deformation member 500 shrink is the same as the direction in which the first connection portion 312 and the second connection portion 322 are inserted and engaged. In this way, on the one hand, the first connecting portion 312 and the second connecting portion 322 can respond to the shrinkage process of the first thermal deformation member 400 and the second thermal deformation member 500 faster; on the other hand, after the first connection portion 312 and the second connection portion 322 are disconnected, when the temperature of the battery cell 1 drops to a temperature lower than the preset threshold value, the first thermal deformation member 400 and the second thermal deformation member 500 return to the original state, and accordingly, the end of the first connection portion 312, which is close to the second connection portion 322, will extend between the two clamping members 323 again through the V-shaped opening of the second connection portion 322 facing the first conductive portion 310, and are clamped by the two clamping members 323, so that the connection between the first conductive portion 310 and the second conductive portion 320 is realized again; that is, when the temperature of the battery cell 1 falls below the preset threshold, the battery cell 1 can still work normally. Of course, in other embodiments of the present application, the first connecting portion may include the two clamping members and the connecting member, and the second connecting portion extends along a straight line.
It should be understood that, even though the first connecting portion 312 and the second connecting portion 322 are mated by plugging in the above embodiment, the application is not limited thereto, and the first connecting portion 312 and the second connecting portion 322 may be connected by other manners in other embodiments of the application. For example, fig. 2 shows a schematic cross-sectional view of a battery cell 1' according to another embodiment of the present application, where the battery cell 1' is different from the battery cell 1 of the foregoing embodiment mainly in that the first connection portion 312' and the second connection portion 322' extend in a straight line, and are connected and fixed by the conductive adhesive 301 '. Because of the conductivity of the conductive adhesive 301', the conductive adhesive 301' is used to bond and fix the first connection portion 312 'and the second connection portion 322', and also is used to conduct a circuit between the first connection portion 312 'and the second connection portion 322'. By changing the filling area of the conductive adhesive 301', the connection strength between the first connection portion 312' and the second connection portion 322 'can be changed, so that the connection strength between the first connection portion 310' and the second connection portion 320 'can ensure that the connection between the first connection portion and the second connection portion is not broken when the battery cell 1' is impacted normally, and the connection between the first connection portion and the second connection portion can be broken when the temperature is higher than a preset threshold value.
It should be understood that, even though the first heat deformable member 400 and the second heat deformable member 500 are heat shrinkable members in the present embodiment, the present application is not limited thereto; in other embodiments of the present application, suitable modifications may be made by those skilled in the art based on the above description. For example, fig. 3 shows a schematic cross-sectional view of a cell 1″ according to another embodiment of the present application, and the main difference between the cell 1″ and the cell 1 and 1' in the above embodiment is that: in this embodiment, the first thermal deformation member 400 "and the second thermal deformation member 500" in the battery cell 1 "are thermal expansion members made of the thermal expansion material, and the thermal expansion members are used for expanding when the temperature is higher than the preset threshold, so that the first thermal deformation member 400" and the second thermal deformation member 500 "cooperate to drive the first conductive portion 310" and the second conductive portion 320 "to be disconnected when the temperature of the battery cell is higher than the preset threshold. Specifically, one end of the first thermal deformation member 400 "is located at one side of the second conductive portion 320" away from the junction of the first conductive portion 310 "and the second conductive portion 320", and is fixed to the housing 100 ", and the other end extends to be fixed to the first conductive portion 310"; one end of the second thermal deformation member 500 "is located at one side of the first conductive portion 310" away from the junction of the first conductive portion 310 "and the second conductive portion 320" and is fixed to the housing 100 ", and the other end extends to be fixed to the second conductive portion 320". When the temperature of the battery cell 1 "is higher than the preset threshold value, the first thermal deformation member 400" expands, and pushes the first conductive portion 310 "to move or deform in a direction away from the second conductive portion 320"; at the same time, the second thermal deformation member 500 "expands, which pushes the second conductive portion 320" to deform in a direction away from the first conductive portion 310 ", thereby disconnecting the first conductive portion 310" from the second conductive portion 320 ". It is worth mentioning that the thermal expansion member is an element that expands in volume with increasing temperature. Optionally, the thermal expansion member comprises a metallic material such as aluminum, copper and the like with obvious volume change along with temperature change, and/or a nonmetallic material such as polyamide (nylon 6), glass and the like; the first heat deformation member 400 includes a copper tube and nylon tubes respectively disposed at two ends of the copper tube.
For another example, fig. 4 shows a schematic cross-sectional view of a cell 1' "according to another embodiment of the present application, where the cell 1 '" is mainly different from the cell 1, the cell 1', the cell 1 "according to the above embodiment in that: in this embodiment, one of the first thermal deformation member 400 '"and the second thermal deformation member 500'" is a thermal expansion member, and the other is a thermal shrinkage member, and the first thermal deformation member 400 '"and the second thermal deformation member 500'" are used to cooperate to drive the first conductive portion 310 '"and the second conductive portion 320'" to disconnect when the temperature of the battery cell is greater than the preset threshold. Since the first thermal deformation member 400 ' "and the second thermal deformation member 500 '" are respectively corresponding to the thermal expansion member and the thermal shrinkage member, the embodiments of the first thermal deformation member 400 ' "and the second thermal deformation member 500 '" are equivalent to the embodiments of the thermal shrinkage member and the thermal expansion member, respectively, only the first thermal deformation member 400 ' "is used as the thermal expansion member for the following description. Specifically, one end of the first thermal deformation member 400 '"is located at one side of the second conductive portion 320'" away from the junction of the first conductive portion 310 '"and the second conductive portion 320'" and is fixed to the housing 100 '"while the other end extends to be fixed to the first conductive portion 310'"; one end of the second thermal deformation member 500 '"is located at one side of the second conductive portion 320'" away from the junction of the first conductive portion 310 '"and the second conductive portion 320'" and is fixed to the housing 100 '"while the other end extends to be fixed to the second conductive portion 320'". When the temperature of the battery cell 1 '"is higher than the preset threshold, the first thermal deformation member 400'" expands, which pushes the first conductive portion 310 '"to move or deform in a direction away from the first conductive portion 310'"; at the same time, the second thermal deformation member 500 ' "contracts, which drives the second conductive portion 320 '" to deform in a direction away from the first conductive portion 310' "so as to disconnect the first conductive portion 310 '" from the second conductive portion 320' ". Similarly, in other embodiments, the thermal expansion member may be connected to the second conductive portion, and the thermal shrinkage member may be connected to the first conductive portion; the arrangement is basically the same as the above, and is not described here again.
The battery cell 1 provided in the embodiment of the present application includes a case 100, an electrode assembly 200, a tab 300, and a first thermal deformation member 400. The tab 300 includes a first conductive portion 310 and a second conductive portion 320. The first conductive part 310 is received in the case 100 and connected to the electrode assembly 200, and a portion of the second conductive part is received in the case 100 and connected to the first conductive part 310, and a portion of the second conductive part 320 extends out of the case. The first thermal deformation member 400 is accommodated in the housing 100 and fixed to the housing 100, one of the first conductive portion 310 and the second conductive portion 320 is fixed to the first thermal deformation member 400, and the first thermal deformation member 400 is configured to shrink or expand when the temperature of the battery cell 1 is greater than a preset threshold value, so that one of the first conductive portion 310 and the second conductive portion 320 fixed to the first thermal deformation member 400 moves or deforms accordingly, and further the first conductive portion 310 and the second conductive portion 320 are disconnected.
Compared with the current battery cells on the market, when the temperature of the battery cell provided by the embodiment of the application is greater than the preset threshold value, the first conductive part 310 and the second conductive part 320 inside the tab 300 are disconnected, i.e. the battery cell 1 can be spontaneously disconnected when the temperature is higher than a certain specific value. The operator can design the preset threshold to be a proper temperature value lower than the thermal runaway temperature, so that the first conductive portion 310 and the second conductive portion 320 are separated before the thermal runaway occurs, thereby eliminating the potential safety hazard that the battery cell may explode.
Based on the same inventive concept, the present application further provides a battery, which includes the electric core 1 in at least one embodiment, and the battery is used for supplying power to electric devices such as a mobile phone, a tablet, a notebook computer, and the like.
Based on the same inventive concept, the embodiment of the application also provides an electric device, which comprises the battery of any one of the above.
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 (11)
1. An electric core comprises a shell, an electrode assembly and a tab, wherein the electrode assembly accommodates the shell,
the electrode tab comprises a first conductive part and a second conductive part, the first conductive part is accommodated in the shell and is connected with the electrode assembly, part of the second conductive part is accommodated in the shell and is connected with the first conductive part, and part of the second conductive part extends out of the shell;
the battery cell also comprises a first thermal deformation piece, wherein the first thermal deformation piece is accommodated in the shell and fixed with the shell, one of the first conductive part and the second conductive part is fixed with the first thermal deformation piece, and the first thermal deformation piece is used for shrinking or expanding when the temperature of the battery cell is greater than a preset threshold value so as to disconnect the first conductive part from the second conductive part;
the battery cell also comprises a second thermal deformation piece which is accommodated in the shell and fixed with the shell, and the other one of the first conductive part and the second conductive part is fixed with the second thermal deformation piece; the second thermal deformation piece and the first thermal deformation piece are arranged along the thickness direction of the battery cell, and when the temperature of the battery cell is greater than a preset threshold value, the second thermal deformation piece and the first thermal deformation piece shrink or expand along the thickness direction of the battery cell.
2. The cell of claim 1, wherein the first heat deformable member is a heat shrink member configured to shrink when the temperature of the cell is greater than the predetermined threshold to disconnect the first conductive portion from the second conductive portion.
3. The cell of claim 2, wherein the cell comprises a plurality of conductive traces,
the first thermal deformation piece is fixed with the first conductive part;
the second thermal deformation piece is used for shrinking when the temperature of the battery cell is greater than the preset threshold value so as to be matched with the first thermal deformation piece together to drive the first conductive part to be disconnected with the second conductive part.
4. The cell of claim 3, wherein the first conductive portion comprises a first connection portion and the second conductive portion comprises a second connection portion, the first connection portion being in a mating plug-in engagement with the second connection portion;
along the plug-in matching direction of the first connecting part and the second connecting part, the first thermal deformation piece and the second thermal deformation piece are fixed on two side walls which are oppositely arranged on the shell in a one-to-one correspondence manner, and the first connecting part and the second connecting part are both positioned between the first thermal deformation piece and the second thermal deformation piece.
5. The cell of claim 4, wherein the first and second heat deformable members are heat shrink tubes;
one end of the first thermal deformation piece is fixed with the shell, and the other end of the first thermal deformation piece is fixed with the first conductive part;
one end of the second thermal deformation piece is fixed with the shell, and the other end of the second thermal deformation piece is fixed with the second conductive part.
6. The cell of claim 4, wherein the directions of extension of the first and second thermally deformable members are parallel to the mating direction, respectively.
7. The cell of claim 4, wherein the electrode is electrically connected to the electrode,
the first connecting part extends in a straight line, the second connecting part comprises two clamping pieces which are symmetrically arranged, each clamping piece part protrudes towards the other clamping piece, and the first connecting part is clamped between the two clamping pieces; or,
the second connecting portion extends in a straight line, the first connecting portion comprises two clamping pieces which are symmetrically arranged, each clamping piece protrudes towards the other clamping piece, and the second connecting portion is clamped between the two clamping pieces.
8. A cell according to any one of claims 1 to 3, wherein the first conductive portion and the second conductive portion are fixedly connected by a conductive adhesive.
9. The cell of claim 1, wherein the cell comprises a plurality of conductive traces,
the first thermal deformation piece and the second thermal deformation piece are thermal expansion pieces, the thermal expansion pieces are used for expanding when the temperature of the battery cell is larger than the preset threshold, and the first thermal deformation piece and the second thermal deformation piece are used for cooperatively driving the first conductive part and the second conductive part to be disconnected when the temperature of the battery cell is larger than the preset threshold.
10. The cell of claim 1, wherein the cell comprises a plurality of conductive traces,
one of the first thermal deformation piece and the second thermal deformation piece is a thermal expansion piece, the other one is a thermal shrinkage piece, the thermal expansion piece is used for expanding when the temperature of the battery cell is larger than the preset threshold value, the thermal shrinkage piece is used for contracting when the temperature of the battery cell is larger than the preset threshold value, and the first thermal deformation piece and the second thermal deformation piece are used for cooperatively driving the first conductive part and the second conductive part to be disconnected when the temperature of the battery cell is larger than the preset threshold value.
11. A battery comprising a cell according to any one of claims 1 to 10.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110077420.XA CN114865236B (en) | 2021-01-20 | 2021-01-20 | Battery cell and battery |
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| CN202110077420.XA CN114865236B (en) | 2021-01-20 | 2021-01-20 | Battery cell and battery |
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| CN114865236A (en) | 2022-08-05 |
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