CN116868420A - Battery cell, manufacturing method and device thereof, and electricity utilization device - Google Patents
Battery cell, manufacturing method and device thereof, and electricity utilization device Download PDFInfo
- Publication number
- CN116868420A CN116868420A CN202180092756.1A CN202180092756A CN116868420A CN 116868420 A CN116868420 A CN 116868420A CN 202180092756 A CN202180092756 A CN 202180092756A CN 116868420 A CN116868420 A CN 116868420A
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- China
- Prior art keywords
- tab group
- tab
- end cap
- battery cell
- electrode
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 230000005611 electricity Effects 0.000 title description 3
- 238000004804 winding Methods 0.000 claims abstract description 103
- 238000003466 welding Methods 0.000 claims description 65
- 230000007423 decrease Effects 0.000 claims description 6
- 239000000178 monomer Substances 0.000 abstract description 6
- 239000010410 layer Substances 0.000 description 54
- 238000000034 method Methods 0.000 description 26
- 230000008569 process Effects 0.000 description 22
- 238000005520 cutting process Methods 0.000 description 14
- 238000007789 sealing Methods 0.000 description 12
- 239000000463 material Substances 0.000 description 10
- 238000005452 bending Methods 0.000 description 9
- 238000009413 insulation Methods 0.000 description 9
- 229910001416 lithium ion Inorganic materials 0.000 description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 8
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 7
- 229910052802 copper Inorganic materials 0.000 description 7
- 239000010949 copper Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000003792 electrolyte Substances 0.000 description 6
- 230000008901 benefit Effects 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000011149 active material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000007774 positive electrode material Substances 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 2
- JDZCKJOXGCMJGS-UHFFFAOYSA-N [Li].[S] Chemical compound [Li].[S] JDZCKJOXGCMJGS-UHFFFAOYSA-N 0.000 description 2
- 239000013543 active substance Substances 0.000 description 2
- 239000006183 anode active material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- VVNXEADCOVSAER-UHFFFAOYSA-N lithium sodium Chemical compound [Li].[Na] VVNXEADCOVSAER-UHFFFAOYSA-N 0.000 description 2
- 229910001425 magnesium ion Inorganic materials 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
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
- H01M50/147—Lids or covers
-
- 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
- H01M50/172—Arrangements of electric connectors penetrating the casing
-
- 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
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The embodiment of the application provides a battery monomer, a manufacturing method and device thereof and an electric device, wherein the battery monomer comprises the following components: a housing (101) having an opening (1011); an end cap assembly (102) for closing the opening (1011), the end cap assembly (102) including an end cap body (1021) and electrode terminals (1022), the electrode terminals (1022) being connected to the end cap body (1021) in an insulating manner; and an electrode assembly (10) provided in the case (101), the electrode assembly (10) having a wound structure and comprising: the device comprises a main body part (11), a first tab group (12) and a second tab group (13), wherein the polarities of the first tab group (12) and the second tab group (13) are opposite, and the first tab group and the second tab group are connected to the same side of the main body part (11) along a winding axis (K); the first tab group (12) is electrically connected to the electrode terminal (1022), and the center line of the electrode terminal (1022) is offset by a predetermined distance in the radial direction of the winding structure with respect to the winding axis (K), and the second tab group (13) is electrically connected to the end cap body (1021).
Description
The present application relates to the field of battery technologies, and in particular, to a battery unit, a manufacturing method and apparatus thereof, and an electric device.
With the advantages of high energy density, high power density, multiple recycling times, long storage time and the like of batteries such as lithium ions, the lithium ion battery has been widely applied to electric automobiles.
However, improving the performance of batteries in electric vehicles has been a problem in the industry.
Disclosure of Invention
The application aims to improve the performance of a battery.
According to a first aspect of the present application, there is provided a battery cell comprising:
a housing having an opening;
the end cover assembly is used for closing the opening and comprises an end cover body and an electrode terminal, and the electrode terminal is connected to the end cover body in an insulating manner; and
an electrode assembly provided in the case, the electrode assembly being of a winding structure and including: the main body part, the first tab group and the second tab group are opposite in polarity and are connected to the same side of the main body part along the winding axis of the winding structure;
the first tab group is electrically connected with the electrode terminal, the center line of the electrode terminal is offset by a preset distance relative to the winding axis in the radial direction of the winding structure, and the second tab group is electrically connected with the end cover body.
According to the embodiment, the first tab group and the second tab group are led out from the same end of the main body part, and only an electric connection space is reserved at one end of the electrode assembly, so that electrode terminals are respectively arranged at two ends of the battery cell, the overall energy density of the battery cell can be effectively improved, and the volume of the battery cell can be reduced under the condition that the capacity of the battery cell is fixed, so that the battery cell is easier to be laid out in the power utilization device.
In addition, the battery cell is only provided with one electrode terminal, the first tab group is electrically connected with the electrode terminal, and the second tab group is directly electrically connected with the end cover body, so that the structure and the assembly process of the battery cell can be simplified. By omitting one electrode terminal, a larger space can be reserved on the end cover body, the center line of the electrode terminal deviates from the winding axis by a preset distance in the radial direction of the winding structure, the space on one side of the electrode terminal on the end cover body can be further increased, on one hand, the liquid injection hole and the pressure relief structure are easy to be distributed on the end cover body, and a sufficient space is reserved for arranging the temperature acquisition component, the confluence piece among the battery monomers and various leads; on the other hand, the position of the electrode terminal can be flexibly adjusted according to the position of the first tab group, and the cross section area of the electrode terminal can be increased, so that the overcurrent capacity of the battery cell can be improved.
In some embodiments, the first tab set and the second tab set are spaced apart along the circumference of the coiled structure.
In this embodiment, the first tab group is located entirely on one side of the winding axis, and when the first tab group is electrically connected to the electrode terminal, the center line of the electrode terminal may be offset in the radial direction of the winding structure with respect to the winding axis. In addition, the structure can separate the first tab group from the second tab group in space to avoid short circuit, and electrolyte can infiltrate into the main body part through the separation area, so that the electrolyte fully reacts with active substances on the first pole piece and the second pole piece in the process of charging and discharging the battery monomer.
In some embodiments, the electrode terminal is provided with a first groove on a surface far from the electrode assembly, the first groove is concave towards a direction close to the electrode assembly, a first welding part is formed between the bottom surface of the first groove and the surface of the electrode terminal close to the electrode assembly, and the first tab group is welded with the first welding part.
According to the embodiment, the first groove is formed in the electrode terminal, the thickness of the electrode terminal in the welding area is reduced, the end cover assembly can be directly welded from the outer side of the electrode terminal after being mounted on the shell, the assembly process is simplified, and the welding firmness can be improved, so that the electrode terminal and the first tab group can be reliably electrically connected.
In some embodiments, a second groove is formed on the surface of the end cover body away from the electrode assembly, the second groove is concave towards the direction close to the electrode assembly, a second welding part is formed between the bottom surface of the second groove and the surface of the end cover body close to the electrode assembly, and the second lug group is welded with the second welding part.
According to the embodiment, the second groove is formed in the end cover body, the thickness of the end cover body in the welding area is reduced, the end cover assembly can be directly welded from the outer side of the end cover body after being mounted on the shell, the assembly process is simplified, and the welding firmness can be improved, so that the end cover body and the second lug group can be reliably electrically connected.
In some embodiments, the end cap body includes a main plate and a protrusion disposed on a side of the main plate adjacent to the electrode assembly, the second groove extending into the protrusion.
According to the embodiment, the protruding part is arranged, the main body plate is locally thickened at one side close to the electrode assembly, so that the second welding part is closer to the second lug group in the direction of the winding axis, the second lug group and the end cover body are directly and singly connected, an adapter is omitted, the structure is simplified, and the lead-out length of the second lug group can be reduced. In addition, in the case of locally thickening the main body plate, by extending the second groove into the protruding portion, the second welding portion can be maintained at a proper welding thickness, and the electrical connection reliability can be improved.
In some embodiments, the battery cell further comprises: and the first tab group is electrically connected with the electrode terminal through the switching piece, and/or the second tab group is electrically connected with the end cover body through the switching piece.
According to the embodiment, the adaptor is arranged, so that the requirements on the position relation between the first tab group and the electrode terminal and the position relation between the second tab group and the end cover body can be reduced, and the process difficulty of electric connection is reduced; in addition, as the lugs are fluffy, the connection reliability is improved more easily through the adapter; in addition, damage to the tab or the main body portion during electrical connection can be prevented, and for example, deformation of the tab or the main body portion due to welding heat or falling of a coating layer on the main body portion can be prevented when welding is used.
In some embodiments, the adapter comprises: the first connecting part and the second connecting part are mutually connected, the radial dimension of the first connecting part is larger than that of the second connecting part, the first connecting part is electrically connected with the first tab group or the second tab group, and the second connecting part is connected with the electrode terminal or the end cover body.
According to the embodiment, the radial dimension of the first connecting part is larger than that of the second connecting part, so that the first connecting part can cover more lugs in the first lug group or the second lug group in the radial direction, the connection length of the first connecting part and the first lug group or the second lug group in the radial direction is increased, the electric connection reliability is improved, for example, when electric connection is carried out by welding, a welding track can pass through more lugs, and the connection between the first connecting part and each lug is firmer. Also, by reducing the radial dimension of the second connection portion, it is possible to fit the connection region of the electrode terminal or the end cap body, thereby accommodating a smaller cross-sectional area of the terminal, and reducing the electrical connection region on the end cap body, so as to make room for layout of other components.
In some embodiments, the first tab set is a negative tab set and the second tab set is a positive tab set.
According to the embodiment, the polarities of the first tab group and the second tab group are set according to the materials commonly adopted by the tabs, the end cover body and the electrode terminals, so that the electric connection process of the first tab group and the second tab group can be simplified on the basis of ensuring the performance of the battery cell. Optionally, the first tab group is a positive tab group, and the second tab group is a negative tab group.
In some embodiments, the body portion has a plurality of pole piece layers in a radial direction, the first tab set includes a plurality of first tabs arranged in a stacked configuration, and the second tab set includes a plurality of second tabs arranged in a stacked configuration; in the radial direction, at least two adjacent first tabs in the first tab group are separated by more than one pole piece layer with the same polarity, and/or at least two adjacent second tabs in the second tab group are separated by more than one pole piece layer with the same polarity.
According to the embodiment, the number of the lead-out tabs on the same pole piece in the electrode assembly is reduced, the difficulty in the procedure of die cutting the tabs is reduced, the dislocation of a plurality of tabs in the tab group after winding can be improved, the dislocation amount is easy to control in a smaller range, and therefore the effective connection part of the tab group and the electrode terminal is increased; in addition, the structure can be used for arranging sparse lugs in the area of the winding inner ring, so that the difficulty in die cutting of the lugs is reduced, and the size and position accuracy of the lugs are improved; in addition, the tab extraction method can reduce the weight of the electrode assembly, thereby reducing the weight of the battery cell. The above advantages can improve the performance of the battery cell.
In some embodiments, the number of pole pieces of like polarity spaced between each two adjacent first tabs in the first tab set is equal and/or the number of pole pieces of like polarity spaced between each two adjacent second tabs in the second tab set is equal.
According to the embodiment, the plurality of lugs in the lug group are uniformly distributed along the radial direction, provided electric energy of the plurality of lugs in the lug group is led out more easily, for example, if the lug group is electrically connected with the electrode terminal through the adapter, the welding track of the adapter and the lug group can be controlled more easily when welding is adopted, the electric connection effect of the lug group and the adapter is ensured, and the reliability of the single battery operation is improved.
In some embodiments, the number of pole piece layers spaced between each two adjacent first tabs in the first tab set decreases gradually from inside to outside, and/or the number of pole piece layers spaced between each two adjacent second tabs in the second tab set decreases gradually from inside to outside.
According to the embodiment, the fact that the winding circumference of the pole piece is gradually reduced from the outer layer to the inner layer is considered, the distance between two adjacent pole lugs close to the inner layer is smaller, the pole lugs are densely distributed, if each pole piece layer is provided with the pole lugs, the distance between the adjacent pole lugs is small, the overcurrent capacity of the radial inner area of the pole lug group is provided with a surplus, the process of die cutting the pole lugs is difficult, the precision of the die cutting pole lugs is difficult to ensure, and the dislocation of a plurality of pole lugs in the pole lug group is difficult to control.
In some embodiments, the first tab located innermost in the radial direction is n < th > from the innermost 1 Leading out pole piece layers with the same polarity, n 1 >1, a step of; and/or the second ear located at the innermost side is n from the innermost side 2 Leading out pole piece layers with the same polarity, n 2 >1。
According to the embodiment, the distance between the first lug group and the second lug group can be increased, so that the possibility of overlap joint of the first lug group and the second lug group is reduced, and the insulation effect between lug groups with different polarities is ensured.
In some embodiments, the first tab set and the second tab set are symmetrically disposed about the winding axis.
According to the embodiment, the first pole piece and the second pole piece have the same overcurrent capacity, the circumferential size of the pole lug group is increased, the overcurrent capacity of a battery monomer can be improved, and the space isolation effect of the first pole lug group and the second pole lug group can be improved to prevent short circuits. Moreover, if the first tab group is electrically connected with the electrode terminal through one adapter, the second tab group is electrically connected with the end cover body through another adapter, and the symmetrical arrangement of the first tab group and the second tab group provides arrangement space for the two adapters, so that the two adapters can be prevented from being short-circuited in the circumferential direction due to too short distance.
In some embodiments, the housing has a recess that is recessed circumferentially inwardly relative to an outer wall of the housing, the housing forms a bend at an end of the recess proximate the opening, the bend has a receiving cavity, the radially outer end of the end cap body is embedded in the receiving cavity, and the battery cell further includes a seal disposed between the bend and the end cap body.
The embodiment adopts the upsetting sealing mode to realize the fixation between the end cover assembly and the shell, and can realize the insulation between the end cover body and the shell by arranging the sealing element, so that the shell is not electrified under the condition that the end cover body is used as an electrode terminal, and the working safety of the battery cell is improved.
According to a second aspect of the present application, there is provided a battery comprising: the battery cell and the case described in the above embodiments, the case is configured to accommodate the battery cell.
According to a third aspect of the present application, there is provided an electrical device comprising a battery of the above embodiment for providing electrical energy to the electrical device.
According to a fourth aspect of the present application, there is provided a method of manufacturing a battery cell, comprising:
a component providing step of: providing a housing, an end cap assembly, and an electrode assembly; the shell is provided with an opening, the end cover assembly comprises an end cover body and an electrode terminal which is connected to the end cover body in an insulating mode, and the center line of the electrode terminal is offset by a preset distance in the radial direction of the winding structure relative to the winding axis; the electrode assembly is in a wound structure and includes: the main body part, the first tab group and the second tab group are opposite in polarity and are connected to the same side of the main body part along the winding axis of the winding structure;
And an end cover mounting step: the end cover assembly is used for sealing the opening, the first tab group is electrically connected with the electrode terminal, and the second tab group is electrically connected with the end cover body.
According to a fifth aspect of the present application, there is provided an apparatus for manufacturing a battery cell, comprising:
a component providing device configured to provide a case, an end cap assembly, and an electrode assembly; the shell is provided with an opening, the end cover assembly comprises an end cover body and an electrode terminal which is connected to the end cover body in an insulating mode, and the center line of the electrode terminal is offset by a preset distance in the radial direction of the winding structure relative to the winding axis; the electrode assembly is in a wound structure and includes: the main body part, the first tab group and the second tab group are opposite in polarity and are connected to the same side of the main body part along the winding axis of the winding structure; and
and an end cap mounting device configured to close the end cap assembly to the opening and electrically connect the first tab group with the electrode terminal and the second tab group with the end cap body.
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic view of the structure of some embodiments of the application for mounting a battery to a vehicle.
Fig. 2 is an exploded view of some embodiments of the battery of the present application.
Fig. 3 is a schematic structural view of some embodiments of the battery cell of the present application.
Fig. 4 is a cross-sectional view of some embodiments of the battery cells of the present application in a longitudinal section.
Fig. 5 is a cross-sectional view of some embodiments of the electrode assembly of fig. 4 in a longitudinal section.
Fig. 6 is a schematic end structure view of the electrode assembly shown in fig. 5.
Fig. 7 is a cross-sectional view of other embodiments of the electrode assembly of fig. 4 in longitudinal section.
Fig. 8 is a schematic end structure view of the electrode assembly shown in fig. 7.
Fig. 9A is a schematic diagram of a fan-shaped structure of the first tab set and the second tab set.
Fig. 9B is a schematic diagram of the first tab set and the second tab set with an equal width structure.
Fig. 10 is a cross-sectional view of other embodiments of the battery cell of the present application in longitudinal section.
Fig. 11 is a flow chart of some embodiments of the electrode assembly manufacturing method of the present application.
Fig. 12 is a schematic block diagram showing some embodiments of an electrode assembly manufacturing apparatus according to the present application.
In the drawings, the drawings are not drawn to scale.
Marking:
10. an electrode assembly; 11. a main body portion; 111. a pole piece layer; 12. the first tab group; 12', a first tab; 121. a first bending part; 13. a second ear group; 13', a second lug; 131. a second bending part; 1. a first pole piece; 2. a second pole piece; 3. a diaphragm; K. a winding axis;
100. A battery cell; 101. a housing; 1011. an opening; 1012. a concave portion; 1013. a bending part; q, accommodating the cavity; 102. an end cap assembly; 1021. an end cap body; 1021A, a body panel; 1021B, a projection; 1021', a second groove; w2, a second welding part; 1022. an electrode terminal; 1022A, a first terminal portion; 1022B, second terminal portions; 1022', a first recess; w1, a first welding part; 103. an adapter; 1031. a first connection portion; 1032. a second connecting portion; 104. a seal;
200. a battery; 201. a case; 201A, a housing portion; 201B, a first cover body; 201C, a second cover body;
300. a vehicle; 301. an axle; 302. a wheel; 303. a motor; 304. a controller;
400. a manufacturing device; 410. a component providing apparatus; 420. and end cover mounting equipment.
Embodiments of the present application are described in further detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the application and are not intended to limit the scope of the application, i.e., the application is not limited to the embodiments described.
In the description of the present application, it is to be noted that, unless otherwise indicated, the meaning of "plurality" is two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like are merely used for convenience in describing the present application and to simplify the description, and do not denote or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present application.
Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The "vertical" is not strictly vertical but is within the allowable error range. "parallel" is not strictly parallel but is within the tolerance of the error. The directional terms appearing in the following description are those directions shown in the drawings and do not limit the specific structure of the application.
In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present application can be understood as appropriate by those of ordinary skill in the art.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least some embodiments of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
In the description of the embodiments of the present application, the term "plurality" means two or more (including two), and similarly, "plural sets" means two or more (including two), and "plural sheets" means two or more (including two).
The description of the orientation or positional relationship of the present application as indicated by "upper," "lower," "top," "bottom," "front," "rear," "inner" and "outer" etc. is merely for convenience of description of the present application and is not intended to indicate or imply that the apparatus referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the scope of the application.
The battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiment of the application. The battery cell may be in a cylindrical shape, a flat shape, a rectangular parallelepiped shape, or other shapes, which is not limited in this embodiment of the application. The battery cells are generally classified into three types according to the packaging method: the cylindrical battery cell, the square battery cell and the soft package battery cell are not limited in this embodiment.
Current battery cells generally include a case and an electrode assembly received in the case, and the case is filled with an electrolyte. The electrode assembly is mainly formed by stacking or winding first and second electrode sheets having opposite polarities, and a separator is generally provided between the first and second electrode sheets. The portions of the first and second electrode sheets coated with the active material constitute a main body portion of the electrode assembly, and the portions of the first and second electrode sheets not coated with the active material constitute first and second tabs, respectively. In the lithium ion battery, the first pole piece may be a positive pole piece, including a positive current collector and positive active material layers disposed on two sides of the positive current collector, where the positive current collector may be made of aluminum, and the positive active material may be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, for example; the second electrode plate may be an anode electrode plate, including an anode current collector and anode active material layers disposed on both sides of the anode current collector, where the anode current collector may be copper, and the anode active material may be graphite or silicon, for example. The first tab and the second tab may be located at one end of the main body portion together or located at two ends of the main body portion respectively. In the charge and discharge process of the battery cell, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab is connected with the terminal to form a current loop.
The current battery cell is generally provided with a first electrode terminal and a second electrode terminal with opposite polarities, which are used for being connected into an electric circuit to supply power, wherein the first electrode lug is electrically connected with the first electrode terminal, and the second electrode lug is electrically connected with the second electrode terminal. For example, for a cylindrical battery cell, since the end area of the battery cell is small, the second tab and the second electrode terminal are respectively provided at both ends of the battery cell, and accordingly, the first tab and the second tab are respectively led out from both ends of the electrode assembly. The inventors have found in practice that the tabs and electrode terminals at each end occupy a certain space for electrical connection, require more space to be consumed in the height direction of the battery cell, cause an increase in the overall volume of the battery cell, and affect the overall energy density of the battery cell.
In order to increase the energy density of the battery cell, the inventors have conceived to provide the first electrode terminal and the second electrode terminal on the same end of the battery cell, and accordingly, to lead the first tab and the second tab out of the same end of the electrode assembly. However, this arrangement suffers from the following two problems.
1. Spatial layout problem: the end cover is provided with two electrode terminals simultaneously, so that the end cover is crowded, the insulation problem of the two electrode terminals is also required to be considered, in addition, the end cover is also provided with a liquid injection hole and a pressure relief structure, a temperature acquisition component, a confluence piece between battery monomers, various leads and the like are arranged, and the space layout is difficult to carry out when the area of the end cover is smaller.
2. Insulation problem: the first electrode terminal and the second electrode terminal are arranged at the same end of the battery cell and need to be reliably insulated, and the first electrode lug and the second electrode lug led out from the same end of the electrode assembly need to consider the insulation problem when being led out, so that the working reliability of the battery cell is improved.
Based on the findings of the above problems, the inventors of the present application have improved the manner in which the battery cells output electric energy from the idea of increasing the energy density of the battery cells and improving the spatial layout on the end caps.
The end cover assembly comprises an end cover body and an electrode terminal, and the electrode terminal is connected to the end cover body in an insulating manner; the electrode assembly is in a wound structure and includes: the main body part, the first tab group and the second tab group are opposite in polarity and are connected to the same side of the main body part along the winding axis of the winding structure; the first tab group is electrically connected with the electrode terminal, the center line of the electrode terminal is offset by a preset distance relative to the winding axis in the radial direction of the winding structure, and the second tab group is electrically connected with the end cover body. The battery cell can improve the overall energy density, simplify the structure and the assembly process of the battery cell by omitting one electrode terminal, and leave a larger space on the end cover body, thereby leaving a sufficient space for arranging all parts on the end cover.
The battery cell of the embodiment of the application is suitable for batteries and power utilization devices using the batteries.
The electric device may be a cellular phone, a portable device, a notebook computer, a battery car, an electric car, a ship, a spacecraft, an electric toy, an electric tool, and the like, for example, a spacecraft including an airplane, a rocket, a space plane, and a spacecraft, and the like, an electric toy including a stationary or mobile electric toy, for example, a game machine, an electric car toy, an electric ship toy, and an electric airplane toy, and the like, and an electric tool including a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, and an electric planer.
As shown in fig. 1, the electric device may be a vehicle 300, for example, a new energy vehicle, which may be a pure electric vehicle, a hybrid electric vehicle, or an extended range vehicle; or the electricity utilization device can also be an unmanned plane or a ship. Specifically, the vehicle 300 may include an axle 301, wheels 302 coupled to the axle 301, a motor 303, a controller 304, and a battery 200, the motor 303 being configured to drive the axle 301 in rotation, the controller 304 being configured to control operation of the motor 303, the battery 200 may be disposed at a bottom, a head, or a tail of the vehicle 300 for providing electrical power to the operation of the motor 303 and other components of the vehicle.
As shown in fig. 2, the battery 200 includes a case 201 and the battery cell 100. In the battery 200, the number of the battery cells 100 may be one or more. If there are multiple battery units 100, the multiple battery units 100 may be connected in series or parallel or in parallel, where in parallel refers to that the multiple battery units 100 are connected in series or parallel, or the multiple battery units 100 may be connected in series or parallel or in parallel to form a battery module, and then the multiple battery modules are connected in series or parallel or in parallel to form a whole and are contained in the box 201. All the battery cells 100 may be directly connected in series, parallel or series-parallel, and then the whole body formed by all the battery cells 100 is accommodated in the case 201.
The case 201 is hollow inside for accommodating one or more battery cells 100, and the case 201 may have different shapes and sizes according to the shape, number, combination, and other requirements of the accommodated battery cells 100. For example, the case 201 may include: the accommodating portion 201A, the first cover 201B and the second cover 201C, both opposite ends of the accommodating portion 201A have openings, the first cover 201B and the second cover 201C are respectively used for closing the openings at both ends of the accommodating portion 201A, and the accommodating portion 201A has a rectangular tubular structure according to the arrangement of the plurality of battery cells 100 in fig. 2.
The battery cell 100 may be, for example, a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a magnesium ion battery, or the like.
In some embodiments, as shown in fig. 3 and 4, the battery cell 100 includes a case 101, an end cap assembly 102, and an electrode assembly 10. The housing 101 has an opening 1011; the cap assembly 102 serves to close the opening 1011, and the cap assembly 102 includes an cap body 1021 and electrode terminals 1022, the electrode terminals 1022 being insulation-coupled to the cap body 1021. The electrode assembly 10 is provided in the case 101, and the electrode assembly 10 is in a wound structure and includes: the main body 11, the first tab set 12 and the second tab set 13 are opposite in polarity, and are connected to the same side of the main body 11 along the winding axis K of the winding structure. The first tab set 12 is electrically connected to the electrode terminal 1022, and the center line of the electrode terminal 1022 is offset by a predetermined distance in the radial direction of the winding structure with respect to the winding axis K, and the second tab set 13 is electrically connected to the end cap body 1021.
Wherein the case 101 is of a hollow structure for accommodating the electrode assembly 10, and the case 101 has an opening 1011, and the cap body 1021 is for covering the opening 1011. For the cuboid battery cell 100, the end cover body 1021 is of a rectangular plate-shaped structure; for the cylindrical battery cell 100, the end cap body 1021 has a disk-like structure.
The electrode terminal 1022 is insulatively connected to the end cover body 1021 in two manners, for example, the portion of the electrode terminal 1022 connected to the end cover body 1021 is coated with an insulating layer, or the electrode terminal 1022 includes a conductive portion and an insulating member 1022C, and the insulating member 1022C is provided between the conductive portion and the end cover body 1021 to perform an insulating function. Since the first tab group 12 is electrically connected with the electrode terminal 1022, the second tab group 13 is electrically connected with the end cover body 1021, and the end cover body 1021 functions as an electrode terminal, the electrode terminal 1022 is electrically connected with the end cover body 1021 in an insulating manner, insulation of the positive and negative electrode terminals can be achieved, and the reliability of the operation of the battery cell 100 can be improved. "electrically connected" as used herein includes both the case of direct connection and the case of indirect connection.
The electrode assembly 10 is in a wound structure and includes: the main body 11, and the first tab set 12 and the second tab set 13 with opposite polarities, at least one of the first tab set 12 and the second tab set 13 may be provided.
Specifically, the electrode assembly 10 is formed by winding a first electrode sheet 1 and a second electrode sheet 2 having opposite polarities, and the first electrode sheet 1 and the second electrode sheet 2 are substantially identical in shape and may have an elongated strip-shaped structure. The first pole piece 1 comprises a pole piece main body 11 'and at least one first tab group 12, wherein the first tab group 12 comprises a plurality of first tabs 12' which are stacked, and the plurality of first tabs 12 'protrude from the pole piece main body 11'; the second pole piece 2 comprises a pole piece main body 11' and at least one second pole lug group 13, the second pole lug group 13 comprises a plurality of second pole lugs 13' which are arranged in a laminated mode, the plurality of second pole lugs 13' are protruded out of the pole piece main body 11', and different active substances are coated on the pole piece main bodies 11' of the first pole piece 1 and the second pole piece 2. The lamination arrangement means that a plurality of tabs in the same tab group are distributed along the same radial direction of the winding structure, that is, the projections of the tabs in the radial direction have an overlapping area, and the side parts of the tabs along the winding direction are aligned or have deviation within the protection scope of the application.
The first pole piece 1 and the second pole piece 2 are wound around the winding axis K such that the respective pole piece bodies 11' form the body portion 11. The body portion 11 may be cylindrical, flat, rectangular, or other shape. For example, the first electrode sheet 1 is a positive electrode sheet, and the second electrode sheet 2 is a negative electrode sheet; or the first pole piece 1 is a negative pole piece, and the second pole piece 2 is a positive pole piece.
The center line of the electrode terminal 1022 is offset from the winding axis K in the radial direction of the winding structure by a preset distance, for example, the cross section of the electrode terminal 1022 may be circular, elliptical, triangular, rectangular, or other polygonal, etc., and the center line of the electrode terminal 1022 is disposed offset from the winding axis K in the radial direction of the winding structure regardless of the shape taken by the electrode terminal 1022.
The circumferential position of the electrode terminal 1022 on the end cover body 1021 may be determined according to the circumferential position from which the first tab group 12 is extracted. The preset distance by which the electrode terminals 1022 are radially offset may be determined according to the radial position and size of the first tab group 12 and the cross-sectional size of the electrode terminals 1022. Specifically, the electrode terminal 1022 is integrally opposite to the first tab group 12 in the radial direction, so as to facilitate electrical connection, and increase the effective connection length of the electrode terminal 1022 and the first tab group 12 in the radial direction, thereby improving the overcurrent capability; on this basis, the electrode terminal 1022 is aligned with the middle region of the first tab group 12 in the radial direction, so that the distance of electrons conducted to the middle of the first tab 12' located in the radially inner and outer regions of the first tab group 12 can be reduced at the same time, and the electron transmission speed can be increased, thereby improving the conductivity. In addition to consideration of the conductivity, it is also necessary to comprehensively consider the cross-sectional dimensions of the electrode terminal 1022 such that the side wall of the electrode terminal 1022 does not protrude beyond the side wall of the end cap body 1021.
In this embodiment, the first tab set 12 and the second tab set 13 are led out from the same end of the main body 11, and only the electric connection space is reserved at one end of the electrode assembly 10, so that the electrode terminals 1022 are not provided at two ends of the battery cell 100, which can effectively improve the overall energy density of the battery cell 100, and can reduce the volume of the battery cell 100 under the condition that the capacity of the battery cell 100 is fixed, so that the battery 200 is easier to be laid out in the electric device.
In addition, only one electrode terminal 1022 is provided in the battery cell 100, the first tab set 12 is electrically connected to the electrode terminal 1022, and the second tab set 13 is directly electrically connected to the end cap body 1021, so that the structure and assembly process of the battery cell 100 can be simplified. By omitting one electrode terminal, a larger space can be reserved on the end cover body 1021, the center line of the electrode terminal 1022 is offset by a preset distance in the radial direction of the winding structure relative to the winding axis K, the space on one side of the electrode terminal 1022 on the end cover body 1021 can be further increased, on one hand, the liquid injection hole and the pressure relief structure are easy to be distributed on the end cover body 1021, and a sufficient space is reserved for arranging the temperature acquisition component, the confluence piece among the battery cells 100 and various leads; on the other hand, the position of the electrode terminal 1022 can be flexibly adjusted according to the position of the first tab set 12, which is also beneficial to increase the cross-sectional area of the electrode terminal 1022 to increase the overcurrent capability of the battery cell 100. This design has a greater advantage for smaller areas of the end cap body 1021.
In some embodiments, the first tab set 12 and the second tab set 13 are spaced apart along the circumference of the wound structure.
Since the first tab group 12 and the second tab group 13 are disposed at intervals along the circumferential direction of the winding structure, so that the first tab group 12 and the second tab group 13 extend along a part of the circumferential direction of the winding structure, each two adjacent first tabs 12 'in the first tab group 12 are disposed in the pole piece main body 11' in a discrete manner along the winding direction, and each two adjacent second tabs 13 'in the second tab group 13 are disposed in the pole piece main body 11' in a discrete manner along the winding direction.
In this embodiment, the entire first tab group 12 is located on one side of the winding axis K, and when the first tab group 12 is electrically connected to the electrode terminal 1022, the center line of the electrode terminal 1022 may be offset in the radial direction of the winding structure with respect to the winding axis K. Moreover, this structure can space the first tab set 12 and the second tab set 13 to avoid short circuit, and also can infiltrate the electrolyte into the main body 11 through the space region, so that the electrolyte fully reacts with the active materials on the first electrode tab 1 and the second electrode tab 2 during the charge and discharge of the battery cell 100.
In some embodiments, as shown in fig. 4, the electrode terminal 1022 is provided with a first groove 1022' on a surface thereof remote from the electrode assembly 10, the first groove 1022' is recessed toward a direction approaching the electrode assembly 10, a first welding portion W1 is formed between a bottom surface of the first groove 1022' and a surface of the electrode terminal 1022 approaching the electrode assembly 10, and the first tab group 12 is welded to the first welding portion W1.
Wherein the shape and size of the first grooves 1022' may be set according to the welding area. For example, the first tab set 12 and the electrode terminal 1022 may be welded by laser. The thickness of the first welding portion W1 is to ensure penetration of welding energy to achieve reliable fixation.
In this embodiment, by providing the first grooves 1022' on the electrode terminals 1022, the thickness of the electrode terminals 1022 in the welding area is reduced, the welding can be directly performed from the outside of the electrode terminals 1022 after the end cap assembly 102 is mounted to the case 101, the assembly process is simplified, and the welding firmness can be improved to reliably achieve the electrical connection of the electrode terminals 1022 and the first tab set 12.
In some embodiments, as shown in fig. 4, a second groove 1021' is provided on a surface of the end cap body 1021 remote from the electrode assembly 10, the second groove 1021' is recessed toward a direction approaching the electrode assembly 10, a second welding portion W2 is formed between a bottom surface of the second groove 1021' and a surface of the end cap body 1021 near the electrode assembly 10, and the second tab group 13 is welded to the second welding portion W2.
Wherein the shape and size of the second recess 1021' may be set according to the welding area. If the second tab set 13 is directly electrically connected with the end cover body 1021, the extending length of the second groove 1021' along the circumferential direction may be designed to be not smaller than the circumferential dimension of the second tab set 13, so as to increase the effective connection length between the second tab set 13 and the end cover body 1021, and increase the overcurrent capability; since the plurality of second lugs 13 'of the second lug group 13 are connected together in the radial direction, the second recess 1021' may have a radial extension smaller than the radial dimension of the second lug group 13 to secure the strength of the end cap body 1021.
For example, the second tab set 13 and the end cap body 1021 may be laser welded. The thickness of the second welding portion W2 is required to ensure penetration of the welding energy to achieve reliable fixation.
This embodiment, by providing the second groove 1021' on the end cover body 1021, reduces the thickness of the end cover body 1021 in the welding area, enables welding to be directly performed from the outside of the end cover body 1021 after the end cover assembly 102 is mounted to the housing 101, simplifies the assembly process, and can improve the welding firmness to reliably achieve the electrical connection of the end cover body 1021 and the second tab group 13.
In some embodiments, as shown in fig. 4, the end cover body 1021 includes a main body plate 1021A and a protrusion 1021B, the protrusion 1021B is connected to a side of the main body plate 1021A near the electrode assembly 10, and the second groove 1021' extends into the protrusion 1021B.
In this embodiment, the protruding portion 1021B is provided to thicken the main board 1021A locally on the side close to the electrode assembly 10, so that the second welding portion W2 is closer to the second tab set 13 in the direction of the winding axis K, so that the second tab set 13 is directly and singly connected with the end cover body 1021, and the adaptor 103 is omitted, which simplifies the structure and also reduces the lead-out length of the second tab set 13. Also, in the case where the main body plate 1021A is locally thickened, by extending the second groove 1021' into the projection 1021B, the second welding portion W2 can be maintained at a proper welding thickness, improving the electrical connection reliability.
In some embodiments, the battery cell 100 further comprises: the adapter 103, the first tab set 12 is electrically connected to the electrode terminal 1022 through the adapter 103, and/or the second tab set 13 is electrically connected to the end cap body 1021 through the adapter 103. For example, the electrical connection may be achieved by soldering or riveting.
For example, when welding is performed, the first tab set 12 and/or the second tab set 13 may be welded to the adapter 103, and after the end cap assembly 102 is mounted, the electrode terminal 1022 and the adapter 103 may be electrically connected from outside the end cap assembly 102, and the end cap body 1021 and the adapter 103 may be electrically connected.
Alternatively, the first tab set 12 may be directly electrically connected to the electrode terminal 1022, and the second tab set 13 may be directly electrically connected to the end cap body 1021.
The first tab set 12 and the second tab set 13 can determine whether the adaptor 103 needs to be provided according to the connection requirement.
In the embodiment, the adaptor 103 is arranged, so that the requirement on the position relationship between the first tab set 12 and the electrode terminal 1022 and the position relationship between the second tab set 13 and the end cover body 1021 can be reduced, and the process difficulty of electric connection is reduced; in addition, as the lugs are fluffy, the connection reliability is easier to improve through the adapter 103, so that the overcurrent capacity of the lugs of the inner ring and the outer ring is improved, for example, when the electric connection is carried out in a welding mode, the welding track of the adapter 103 and the lug group can be controlled, and the welding firmness can be improved; in addition, damage to the tab or the main body 11 during electrical connection can be prevented, and for example, when welding is used, welding energy can be prevented from burning the tab, deforming the main body 11, or peeling off a coating layer on the main body 11.
In some embodiments, as shown in fig. 4, the adapter 103 includes: the first and second connection portions 1031 and 1032 are connected to each other, and the first connection portion 1031 is larger in size in the radial direction than the second connection portion 1032.
For the transfer member 103 connected between the first tab group 12 and the electrode terminal 1022, the first connection portion 1031 is electrically connected to the first tab group 12, and the second connection portion 1032 is electrically connected to the electrode terminal 1022; and/or for the adaptor 103 connected between the second tab set 13 and the end cap body 1021, the first connection portion 1031 is electrically connected with the second tab set 13, and the second connection portion 1032 is connected with the end cap body 1021.
For example, the first connection portion 1031 may have a sheet-like structure and extend in a plane perpendicular to the winding axis K, and may increase a connection area with the first tab group 12 or the second tab group 13 to improve connection reliability. One end of the second connection part 1032 may be connected to the first connection part 1031, and the other end of the second connection part 1032 is connected to the electrode terminal 1022.
Considering that the electrode terminal 1022 is small in size, the first tab group 12 is electrically connected with the electrode terminal 1022 through the adapter 103 to improve the reliability of power transmission, and the first groove 1022' may be sized according to the adapter 103. If the second tab set 13 is electrically connected to the end cap body 1021 through the adapter 103, the second recess 1021' is sized according to the adapter 103.
In this embodiment, the radial dimension of the first connection portion 1031 is larger than the radial dimension of the second connection portion 1032, so that the first connection portion 1031 can cover more tabs in the first tab group 12 or the second tab group 13 in the radial direction, the connection length between the first connection portion 1031 and the first tab group 12 or the second tab group 13 in the radial direction is increased, the reliability of electrical connection is improved, for example, when the electrical connection is performed by welding, a welding track can pass through more tabs, and the connection between the first connection portion 1031 and each tab is firmer. Also, by reducing the radial size of the second connection part 1032, it is possible to fit the connection region of the electrode terminal 1022 or the end cap body 1021, thereby accommodating a smaller cross-sectional area of the electrode terminal 1022, and reducing the electrical connection region on the end cap body 1021, so as to make room for layout of other components.
In some embodiments, the first tab set 12 is a negative tab set and the second tab set 13 is a positive tab set.
Typically, the positive current collector is made of aluminum foil, the negative current collector is made of copper foil, and accordingly, the first tab set 12 is made of copper material, and the second tab set 13 is made of aluminum material.
In order to secure the strength of the end cover body 1021, an aluminum alloy material may be used, so that the second tab set 13 of aluminum can be directly welded with the end cover body 1021.
The electrode terminal 1022 is a negative electrode and is connected to the first tab group 12 made of copper, and the plurality of battery cells 100 are generally connected by an aluminum bus bar for weight and cost reduction, so that the portion of the electrode terminal 1022 connected to the external circuit is preferably made of an aluminum material. However, the portion of the electrode terminal 1022 connected to the first tab set 12 made of copper is also made of copper material.
For this, as shown in fig. 4, the electrode terminal 1022 may be designed as a composite electrode terminal including a first terminal portion 1022A and a second terminal portion 1022B, the first terminal portion 1022A and the second terminal portion 1022B being connected along the winding axis K, for example, by friction welding or the like, and the second terminal portion 1022B being located between the first terminal portion 1022A and the electrode assembly 10. The first terminal part 1022A is made of an aluminum material and is used for connection with an external circuit of the battery cell 100; the second terminal 1022B is made of copper material, and is electrically connected to the first tab set 12 or the adaptor 103, for example, by soldering or the like.
Specifically, the first terminal 1022A is coaxially connected to the second terminal 1022B, the first terminal 1022A may have a columnar structure, as shown in fig. 4, the second terminal 1022B may be designed as a flat plate, and the second terminal 1022B is connected to the second connection 1032 of the adapter 103; alternatively, the second terminal portion 1022B may also protrude a partial region of the plate-like structure toward the electrode assembly 10 to be connectable with the first tab set 12, so as to dispense with the provision of the adapter 103.
In order to insulate the conductive portion of the electrode terminal 1022 from the end cap body 1021, the electrode terminal 1022 may further include an insulating member 1022C, and the insulating member 1022C may have a ring-shaped structure and be sleeved outside the first and second terminal portions 1022A and 1022B.
The embodiment sets the polarities of the first tab set 12 and the second tab set 13 according to the materials commonly used for the tabs, the end cap body 1021 and the electrode terminals 1022, and can simplify the electrical connection process of the first tab set 12 and the second tab set 13 on the basis of ensuring the performance of the battery cell 100. Optionally, the first tab set 12 is a positive tab set, and the second tab set 13 is a negative tab set.
In some embodiments, as shown in fig. 5 to 8, the main body 11 has a plurality of pole piece layers 111 in a radial direction, the first tab group 12 includes a plurality of first tabs 12 'stacked, and the second tab group 13 includes a plurality of second tabs 13' stacked; in the radial direction, at least two adjacent first tabs 12 'in the first tab group 12 are separated by more than one pole piece layer 111 with the same polarity, and/or at least two adjacent second tabs 13' in the second tab group 13 are separated by more than one pole piece layer 111 with the same polarity.
The pole piece main body 11 'of the first pole piece 1 is provided with a plurality of pole piece layers 111 along the radial direction of the main body part 11 after winding, the pole piece main body 11' of the second pole piece 2 is also provided with a plurality of pole piece layers 111 along the radial direction of the main body part 11 after winding, the pole piece layers 111 of the first pole piece 1 and the second pole piece 2 are alternately arranged along the radial direction, and all the pole piece layers 111 of the first pole piece 1 and all the pole piece layers of the second pole piece 2 jointly form the main body part 11. The first pole piece 1 only leads out the first pole lug 12 'at a part of the pole piece layer 111 to form a first pole lug group 12, and the second pole piece 2 only leads out the second pole lug 13' at a part of the pole piece layer 111 to form a second pole lug group 13.
The embodiment reduces the number of lead-out tabs on the same pole piece in the electrode assembly 10, reduces the difficulty of a die cutting tab procedure, can also improve the dislocation of a plurality of tabs in the tab group after winding, and is easy to control the dislocation amount in a smaller range, thereby increasing the effective connection part of the tab group and the electrode terminal 1022; in addition, the structure can be used for arranging sparse lugs in the area of the winding inner ring, so that the difficulty in die cutting of the lugs is reduced, and the size and position accuracy of the lugs are improved; in addition, such tab extraction may reduce the weight of the electrode assembly 10, thereby reducing the weight of the battery cell 100. The above advantages can improve the performance of the battery cell 100.
In some embodiments, as shown in fig. 5 and 6, the number of pole piece layers 111 spaced between each two adjacent first pole tabs 12 'in the first pole tab group 12 gradually decreases from inside to outside, and/or the number of pole piece layers 111 spaced between each two adjacent second pole tabs 13' in the second pole tab group 13 gradually decreases from inside to outside.
The solid curved line in the first tab group 12 of fig. 6 represents the lead-out first tab 12', and the dotted curved line represents the pole piece layer 111 where the first tab 12' is not lead-out; the curved solid line in the second tab set 13 represents the led-out second tab 13', and the curved broken line represents the pole piece layer 111 that does not lead out the second tab 13'. "gradually decreasing" with respect to the radial direction of the wound structure includes decreasing in an arithmetic progression, for example, the number of pole piece layers 111 of the same polarity spaced between each two adjacent tabs from inside to outside, in order from inside to outside: the pole piece layers 111 of the innermost region are not all shown, layer 4, layer 3, layer 2, layer 1. Alternatively, "gradually decreasing" also includes decreasing in any other manner.
Optionally, the first tabs 12 'of the first tab group 12 have a uniform pitch along the winding direction, and/or the second tabs 13' of the second tab group 13 have a uniform pitch along the winding direction. On the basis of meeting the lamination setting of a plurality of lugs in the lug group, the structure enables the distance between adjacent lugs in the lug group to be consistent through design, can reduce the difficulty of a die cutting process while reducing the number of the lugs, and can improve the production efficiency of the electrode assembly 10 by only adopting a cutter with the same size for die cutting.
In the embodiment, the winding circumference of the pole piece from the outer layer to the inner layer is considered to be gradually reduced, the distance between two adjacent pole lugs close to the inner layer is smaller, the pole lugs are densely distributed, if each pole piece layer 111 is provided with the pole lugs, the distance between the adjacent pole lugs is small, the overcurrent capacity of the radial inner area of the pole lug group is provided with a margin, the process of die cutting the pole lugs causes great difficulty, the precision of the die cutting pole lugs is difficult to ensure, and the dislocation of a plurality of pole lugs in the pole lug group is difficult to control.
The tab leading-out mode can enable a plurality of tabs in the tab group to be gradually encrypted from inside to outside along the radial direction, on the basis of reducing the number of the tabs, the distances between two adjacent tabs of the inner ring and the outer ring are balanced according to the distribution characteristics of the tabs from the inner layer to the outer layer, so that the distribution of the tabs of the inner layer is sparse, the process difficulty of die cutting the tabs is effectively reduced while the overcurrent capacity is ensured, the precision of the die cutting tabs is improved, and the dislocation quantity of the tabs in the tab group is easily controlled in a smaller range after the tabs are wound. In addition, the weight of the electrode assembly 10 can be effectively reduced.
In some embodiments, the free ends of the plurality of first tabs 12' in each first tab set 12 are closed and connected to the adapter 103; and/or the free ends of a plurality of second lugs 13' in each second lug group 13 are brought together and connected to the adapter 103.
The free ends of the plurality of tabs in the same tab group may be connected together after being closed, for example, by welding, etc., then the length section of the plurality of tabs connected together is connected with the adaptor 103, and finally the adaptor 103 is bent to facilitate connection of the electrode terminals 1022. Since the distances between the plurality of tabs and the close position are different, the plurality of tabs may be set to different lengths in order to facilitate the connection of the plurality of tabs. For the electrode assembly 10 in which the number of the pole piece layers 111 between every two adjacent pole lugs in the pole lug group is gradually reduced from inside to outside, the pole lugs are connected together by a simpler process in the mode due to uneven distribution of the pole lugs in the radial direction, and the requirement on the positioning precision of the end parts of the pole lugs can be reduced during connection. The connection mode of the tab group and the adapter 103 can omit the tab flattening process, directly connect a plurality of tabs in the same tab group together and then connect the tabs with the adapter 103, simplify the assembly process of the battery cell 100, and reduce the requirement on the positioning precision of the tab end when the tab group is connected with the adapter 103, thereby improving the production efficiency of the battery cell 100.
In some embodiments, as shown in fig. 7 and 8, the number of pole piece layers 111 of the same polarity spaced between each two adjacent first tabs 12 'in the first tab set 12 is equal, and/or the number of pole piece layers 111 of the same polarity spaced between each two adjacent second tabs 13' in the second tab set 13 is equal.
The solid curved line in the first tab group 12 of fig. 8 represents the lead-out first tab 12', and the broken curved line represents the pole piece layer 111 where the first tab 12' is not lead-out; the curved solid line in the second tab set 13 represents the led-out second tab 13', and the curved broken line represents the pole piece layer 111 that does not lead out the first tab 12'. For example, the number of pole piece layers 111 spaced between each two adjacent tabs may be 1, 2, 3 or more.
In this embodiment, the plurality of tabs in the tab group are uniformly distributed along the radial direction, so that the provided electric energy of the plurality of tabs in the tab group is more easily led out, for example, if the tab group is electrically connected with the electrode terminal through the adapter 103, when welding is adopted, the welding track of the adapter 103 and the tab group is more easily controlled, the electric connection effect of the tab group and the adapter 103 is ensured, and the working reliability of the battery cell 100 is improved.
In some embodiments, the free ends of the first tabs 12 'in each first tab group 12 are flattened to form first bending portions 121, and the first bending portions 121 of the first tabs 12' are connected to the corresponding adaptor 103; and/or the free ends of the first tabs 12 'in each second tab group 12 are flattened to form second bending parts 131, and the second bending parts 131 of the first tabs 12' are connected to the corresponding adapter 103.
The rubbing and flattening is to apply an external force to the tabs along the circumferential direction of the winding structure through the fixture, so that the tabs are bent and deformed, so that two adjacent tabs along the radial direction are more compact, and the tab group is convenient to connect with the adapter 103 or the electrode terminal 1022.
For the electrode assembly 10 with equal number of pole piece layers 111 between every two adjacent pole lugs in the pole lug group, a plurality of pole lugs in the pole lug group are uniformly distributed along the radial direction, and the connecting parts with consistent lengths can be formed as welding planes by the rubbing process, and are connected to the adapter 103 through the connecting parts of the pole lugs.
According to the embodiment, the free ends of the plurality of tabs in the tab group are flattened to form the connecting parts, the connecting parts are connected to the adapter 103, so that the radial length of the electrical connection between the adapter 103 and the tab group can be increased, when the tab group is connected by welding, the welding track can be easily covered on all the tabs in the tab group, the welding reliability is improved, and the performance of the battery cell 100 is improved.
In some embodiments, the first tab 12' located at the innermost side is led out from the pole piece layer 111 of the 1 st same polarity from the innermost side in the radial direction, n 1 >1, i.e. the innermost n of the first pole piece 1 1 -1 pole piece layer without first tab 12'; and/or the innermost second lug 13' is n-th from the innermost 2 A pole piece layer 111 with the same polarity is led out, n 2 >1, i.e. the innermost n of the second pole piece 2 2 1 pole piece layer 111 has no second pole tab 13'.
This embodiment can increase the distance between the first tab set 12 and the second tab set 13, so as to reduce the possibility of overlapping, and ensure the insulation effect between tab sets with different polarities.
In some embodiments, the case 101 has a recess 1012, the recess 1012 is recessed inward in the circumferential direction with respect to the outer wall of the case 11, the case 101 forms a bent portion 1013 at one end of the recess 1012 near the opening 1011, the bent portion 1013 has a receiving chamber Q, the radially outer end of the end cap body 1021 is inserted into the receiving chamber Q, the battery cell 100 further includes a seal member 104, and the seal member 104 is provided between the bent portion 1013 and the end cap body 1021.
Wherein the recessed portion 1012 may extend along the entire circumferential direction of the housing 101, or a plurality of recessed portions 1012 may be provided at intervals in the circumferential direction of the housing 101. The sealing member 104 may be a sealing ring, and the cross section of the sealing ring may be in a C-shaped structure, and the sealing ring is sleeved on the outer end of the end cover body 1021, so that the end cover body 1021 is insulated from the housing 101. Alternatively, an extension may be provided at one end of the C-shaped structure near the electrode assembly 10, the extension extending in a direction toward the electrode assembly 10 to insulate the recess 1012 from the internal structure of the battery cell 10. For example, the sealing member 104 may be made of rubber or the like.
When the end cover assembly 102 is fixed, the sealing member 104 is sleeved at the radially outer end of the end cover assembly 102, the end cover assembly 102 is placed into the housing 101 from the opening 1011, the end cover assembly 102 abuts against the concave portion 1012, and then the housing 101 is bent at one end of the concave portion 1012 near the opening 1011 to form a bending portion 1013, and the bending portion 1013 is wrapped outside the sealing member 104.
The embodiment adopts the upsetting sealing mode to realize the fixation between the end cover assembly 102 and the shell 101, and can realize the insulation between the end cover body 1021 and the shell 101 by arranging the sealing piece 104, so that the shell 101 is not electrified under the condition that the end cover body 1021 is taken as an electrode terminal, and the working safety of the battery cell 100 is improved.
In some embodiments, as shown in fig. 9A and 9B, the first tab set 12 and the second tab set 13 are symmetrically disposed with respect to the winding axis K. Wherein, "symmetrically disposed" includes the first tab set 12 and the second tab set 13 having the same shape and being positioned in a central symmetry with respect to the winding axis K.
As shown in fig. 9A, the widths of the plurality of first tabs 12' in the first tab group 12 along the winding direction gradually increase from inside to outside, so that the first tab group 12 has a fan-shaped structure; and/or the width of the plurality of second lugs 13' in the second lug group 13 along the winding direction is gradually increased from inside to outside, so that the second lug group 13 has a fan-shaped structure. The width of a plurality of tabs in the tab group is gradually increased from inside to outside along the radial direction, the effective contact area when the tab group is connected with the electrode terminal 1022 can be increased by increasing the width of the tab in the winding direction of the outer layer region on the basis of uniformly distributing the spacing between every two adjacent tabs, and the overcurrent capacity can be increased, so that the performance of the battery cell 100 is improved.
As shown in fig. 9B, the widths of the plurality of first tabs 12' in the first tab group 12 along the winding direction are equal; and/or the widths of the plurality of second lugs 13' in the second lug group 13 in the winding direction are equal.
The tab group is of a rectangular-like structure, and only two opposite side edges of the rectangular structure along the radial direction are arc-shaped. The same side ends of a plurality of tabs in the tab group are aligned to improve the effective contact area when the tab group is electrically connected with the electrode terminal 1022, and improve the overcurrent capability. Optionally, the position deviation of the same side ends of a plurality of tabs in the tab group along the winding direction is also within the protection scope of the scheme. The structure enables the widths of a plurality of tabs in the tab group to be equal, can reduce the difficulty of die cutting the tabs, is easy to ensure the size of the tabs, and is easy to ensure the alignment degree of the tabs during winding, thereby reducing the process difficulty of preparing the electrode assembly 10.
The embodiment enables the first pole piece 1 and the second pole piece 2 to have the same overcurrent capability, is beneficial to increasing the circumferential dimension of the tab group, can improve the overcurrent capability of the battery cell 100, and can improve the space isolation effect of the first tab group 12 and the second tab group 13 to prevent short circuits. Moreover, if the first tab set 12 is electrically connected to the electrode terminal 1022 through one of the adapters 103, and the second tab set 13 is electrically connected to the end cap body 1021 through the other adapter 103, the symmetrical arrangement of the first tab set 12 and the second tab set 13 provides an arrangement space for the two adapters 103, so that the two adapters 103 can be prevented from being short-circuited due to too close distance in the circumferential direction.
Two specific examples of the battery cell 100 will be given below.
In some embodiments, as shown in fig. 4 to 9B, the battery cell 100 includes a case 101, an end cap assembly 102, and an electrode assembly 10. The case 101 has an opening 1011, and the end cap assembly 102 serves to close the opening 1011, and the end cap assembly 102 includes an end cap body 1021 and electrode terminals 1022 connected to the end cap body 1021 in an insulating manner, the end cap body 1021 serving to cover the opening 1011. For example, the battery cell 100 may have a cylindrical shape.
The electrode assembly 10 is provided in the case 101, and the electrode assembly 10 is in a wound structure and includes: the main body 11, the first tab set 12 and the second tab set 13, the polarities of the first tab set 12 and the second tab set 13 are opposite, and the first tab set 12 and the second tab set 13 are connected to the same side of the main body 11 along the winding axis K of the winding structure, and are arranged at intervals along the circumferential direction of the winding structure. The first tab set 12 is electrically connected to the electrode terminal 1022, and the center line of the electrode terminal 1022 is offset by a preset distance in the radial direction of the winding structure with respect to the winding axis K, and the second tab set 13 is electrically connected to the end cover body 1021.
The electrode terminal 1022 may be designed as a composite electrode terminal including a first terminal portion 1022A, a second terminal portion 1022B, and an insulating member 1022C, the first and second terminal portions 1022A and 1022B being connected in a direction along the winding axis K, the second terminal portion 1022B being located between the first terminal portion 1022A and the electrode assembly 10, the insulating member 1022C being sleeved outside the first and second terminal portions 1022A and 1022B.
For example, the electrode terminal 1022 is a negative electrode terminal, and the first terminal portion 1022A is made of an aluminum material and is used for connection with an external circuit of the battery cell 100; the second terminal 1022B is made of copper material and may be designed into a disc structure, and since there is a distance between the second terminal 1022B and the first tab set 12, the second terminal 1022B and the first tab set 12 are electrically connected by the adaptor 103, for example, welding or the like may be used.
The adaptor 103 may include a first connection portion 1031 and a second connection portion 1032, the first connection portion 1031 is electrically connected with the first tab set 12, the second connection portion 1032 is electrically connected with the second terminal portion 1022B, and in order to increase the effective connection length of the adaptor 103 and the first tab set 12, the radial dimension of the first connection portion 1031 is larger than the second connection portion 1032. The first terminal part 1022A is provided with a through hole extending along the winding axis K to form a first groove 1022' at a position where the electrode terminal 1022 is distant from the electrode assembly 10, and a portion of the second terminal part 1022B corresponding to the through hole is welded to the second connection part 1032 as a first welding part W1.
The end cover body 1021 is provided with a second groove 1021' on a surface far from the electrode assembly 10, the second groove 1021' is concave towards a direction approaching the electrode assembly 10, a second welding part W2 is formed between the bottom surface of the second groove 1021' and the surface of the end cover body 1021 near the electrode assembly 10, and the second lug group 13 is welded with the second welding part W2. The end cover body 1021 includes a main body plate 1021A and a protrusion 1021B, the protrusion 1021B is connected to a side of the main body plate 1021A near the electrode assembly 10, and the second groove 1021' extends into the protrusion 1021B. The protruding portion 1021B protrudes to abut against the second tab set 13, and the second welding portion W2 is directly welded to the second tab set 13 through the second groove 1021', without providing the adaptor 103.
The structure of the electrode assembly 10 is described in detail in fig. 5 to 9B, which are not repeated here.
In other embodiments, as shown in fig. 10, the difference from the embodiment shown in fig. 4 is that the middle region of the second terminal portion 1022B is entirely protruded toward the direction of the electrode assembly 10 and protruded to abut against the first tab group 12, so that it is possible to electrically connect with the first tab group 12 directly through the first welding portion W1 of the second terminal portion 1022B, omitting the provision of the adapter 103. The through hole of the first terminal portion 1022A and the concave portion of the second terminal portion 1022B together form a first groove 1022', and the first welding portion W1 and the first tab group 12 may be welded by the first groove 1022'.
Next, the present application provides a method for manufacturing a battery cell 100, which in some embodiments, as shown in fig. 11, includes:
s110, a component providing step: providing a case 101, an end cap assembly 102, and an electrode assembly 10; wherein the case 101 has an opening 1011, the end cap assembly 102 includes an end cap body 1021 and an electrode terminal 1022 insulatively connected to the end cap body 1021, a center line of the electrode terminal 1022 being offset from a winding axis K by a preset distance in a radial direction of the winding structure; the electrode assembly 10 is in a wound structure and includes: the main body 11, the first tab set 12 and the second tab set 13 are opposite in polarity and are connected to the same side of the main body 11 along a winding axis K of the winding structure;
S120, end cover installation: the end cap assembly 102 is closed off the opening 1011, and the first tab set 12 is electrically connected with the electrode terminal 1022, and the second tab set 13 is electrically connected with the end cap body 1021.
In this embodiment, the first tab set 12 and the second tab set 13 are led out from the same end of the main body 11, and only the electric connection space is reserved at one end of the electrode assembly 10, so that the electrode terminals 1022 are not provided at two ends of the battery cell 100, which can effectively improve the overall energy density of the battery cell 100, and can reduce the volume of the battery cell 100 under the condition that the capacity of the battery cell 100 is fixed, so that the battery 200 is easier to be laid out in the electric device.
In addition, the battery cell 100 is provided with only one electrode terminal 1022, the first tab set 12 is electrically connected with the electrode terminal 1022, the second tab set 13 is directly electrically connected with the end cover body 1021, the structure and the assembly process of the battery cell 100 can be simplified, when the area of the end cover body 1021 is smaller, the problem that the electrode terminal 1022 and the injection hole, the pressure release structure and the like on the end cover body 1021 are difficult to be laid out is solved, and the position of the electrode terminal 1022 can be flexibly adjusted according to the position of the first tab set 12 due to the sufficient layout space of the electrode terminal 1022, so that the cross-sectional area of the electrode terminal 1022 can be increased, and the overcurrent capacity of the battery cell 100 can be increased. Further, the center line of the electrode terminal 1022 is offset from the winding axis K by a preset distance in the radial direction of the winding structure, and may further leave a margin for disposing other components on the end cap body 1021.
Finally, the present application proposes a manufacturing apparatus 400 of a battery cell 100, and in some embodiments, as shown in fig. 12, the manufacturing apparatus 400 includes: component providing apparatus 410 and end cap mounting apparatus 420.
The component providing apparatus 410 is configured to provide the case 101, the end cap assembly 102, and the electrode assembly 10; wherein the case 101 has an opening 1011, the end cap assembly 102 includes an end cap body 1021 and an electrode terminal 1022 insulatively connected to the end cap body 1021, a center line of the electrode terminal 1022 being offset from a winding axis K by a preset distance in a radial direction of the winding structure; the electrode assembly 10 is in a wound structure and includes: the main body 11, the first tab set 12 and the second tab set 13 are opposite in polarity, and are connected to the same side of the main body 11 along the winding axis K of the winding structure.
The end cap mounting device 420 is configured to close the end cap assembly 102 to the opening 1011 and electrically connect the first tab set 12 with the electrode terminal 1022 and the second tab set 13 with the end cap body 1021.
While the application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (17)
- A battery cell (100), comprising:a housing (101) having an opening (1011);an end cap assembly (102) for closing the opening (1011), the end cap assembly (102) comprising an end cap body (1021) and electrode terminals (1022), the electrode terminals (1022) being connected to the end cap body (1021) in an insulating manner; andan electrode assembly (10) provided in the case (101), the electrode assembly (10) having a wound structure and comprising: a main body part (11), a first tab group (12) and a second tab group (13), wherein the polarities of the first tab group (12) and the second tab group (13) are opposite, and the first tab group and the second tab group are connected to the same side of the main body part (11) along a winding axis (K) of a winding structure;the first tab group (12) is electrically connected with the electrode terminal (1022), the center line of the electrode terminal (1022) is offset by a preset distance in the radial direction of the winding structure relative to the winding axis (K), and the second tab group (13) is electrically connected with the end cover body (1021).
- The battery cell (100) of claim 1, wherein the first tab set (12) and the second tab set (13) are disposed at intervals along the circumference of the coiled structure.
- The battery cell (100) according to claim 1 or 2, wherein a face of the electrode terminal (1022) away from the electrode assembly (10) is provided with a first groove (1022 '), the first groove (1022 ') is recessed toward a direction approaching the electrode assembly (10), a first welding portion (W1) is formed between a bottom face of the first groove (1022 ') and a surface of the electrode terminal (1022) approaching the electrode assembly (10), and the first tab group (12) is welded with the first welding portion (W1).
- A battery cell (100) according to any one of claims 1 to 3, wherein a second groove (1021 ') is provided on a surface of the end cap body (1021) away from the electrode assembly (10), the second groove (1021 ') is recessed toward a direction approaching the electrode assembly (10), a second welding portion (W2) is formed between a bottom surface of the second groove (1021 ') and a surface of the end cap body (1021) approaching the electrode assembly (10), and the second tab group (13) is welded to the second welding portion (W2).
- The battery cell (100) of claim 4, wherein the end cap body (1021) includes a main body plate (1021A) and a protrusion (1021B), the protrusion (1021B) being provided on a side of the main body plate (1021A) adjacent to the electrode assembly (10), the second groove (1021') extending into the protrusion (1021B).
- The battery cell (100) of any one of claims 1-5, further comprising: and a switching member (103), wherein the first tab group (12) is electrically connected with the electrode terminal (1022) through the switching member (103), and/or the second tab group (13) is electrically connected with the end cover body (1021) through the switching member (103).
- The battery cell (100) of claim 6, wherein the adapter (103) comprises: a first connecting portion (1031) and a second connecting portion (1032) connected to each other, a dimension of the first connecting portion (1031) in the radial direction being larger than a dimension of the second connecting portion (1032);For the adapter (103) connected between the first tab group (12) and the electrode terminal (1022), the first connection portion (1031) is electrically connected to the first tab group (12), and the second connection portion (1032) is electrically connected to the electrode terminal (1022); and/orFor the adapter (103) connected between the first tab group (12) and the electrode terminal (1022), the first connection portion (1031) is electrically connected with the second tab group (13), and the second connection portion (1032) is electrically connected with the end cap body (1021).
- The battery cell (100) according to any one of claims 1 to 7, wherein the first tab group (12) is a negative electrode tab group and the second tab group (13) is a positive electrode tab group.
- The battery cell (100) according to any one of claims 1 to 8, wherein the main body portion (11) has a plurality of pole piece layers (111) in the radial direction, the first tab group (12) includes a plurality of first tabs (12 ') stacked, and the second tab group (13) includes a plurality of second tabs (13') stacked; in the radial direction, at least two adjacent first tabs (12 ') in the first tab group (12) are separated by more than one polar pole piece layer (111), and/or at least two adjacent second tabs (13') in the second tab group (13) are separated by more than one polar pole piece layer (111).
- The battery cell (100) of claim 9, wherein the number of pole piece layers (111) of the same polarity spaced between each two adjacent first tabs (12 ') in the first tab set (12) is equal and/or the number of pole piece layers (111) of the same polarity spaced between each two adjacent second tabs (13') in the second tab set (13) is equal;the number of pole piece layers (111) spaced between every two adjacent first pole lugs (12 ') in the first pole lug group (12) gradually decreases from inside to outside, and/or the number of pole piece layers (111) spaced between every two adjacent second pole lugs (13') in the second pole lug group (13) gradually decreases from inside to outside.
- The battery cell (100) according to claim 9 or 10, wherein, in the radial direction, the first tab (12') located innermost is n-th from the innermost 1 The pole piece layers (111) with the same polarity are led out, n 1 >1, a step of; and/or the second lug (13') located at the innermost side is n-th from the innermost side 2 The pole piece layers (111) with the same polarity are led out, n 2 >1。
- The battery cell (100) according to any one of claims 1 to 11, wherein the first tab group (12) and the second tab group (13) are symmetrically arranged with respect to the winding axis (K).
- The battery cell (100) according to any one of claims 1 to 12, wherein the case (101) has a recessed portion (1012), the recessed portion (1012) being recessed inward in a circumferential direction with respect to an outer wall of the case (11), the case (101) forming a bent portion (1013) at an end of the recessed portion (1012) near the opening (1011), the bent portion (1013) having a receiving chamber (Q), an outer end of the end cap body (1021) in a radial direction being embedded in the receiving chamber (Q), the battery cell (100) further comprising a seal (104), the seal (104) being provided between the bent portion (1013) and the end cap body (1021).
- A battery (200), comprising:the battery cell (100) according to any one of claims 1 to 13; andand a case (201) for accommodating the battery cell (100).
- An electrical device comprising the battery (200) of claim 14, the battery (200) being for providing electrical energy to the electrical device.
- A method of manufacturing a battery cell (100), comprising:a component providing step of: providing a housing (101), an end cap assembly (102) and an electrode assembly (10); wherein the case (101) has an opening (1011), the end cap assembly (102) includes an end cap body (1021) and an electrode terminal (1022) insulatively connected to the end cap body (1021), a center line of the electrode terminal (1022) being offset from the winding axis (K) by a preset distance in a radial direction of the winding structure; the electrode assembly (10) is in a rolled structure and includes: a main body part (11), a first tab group (12) and a second tab group (13), wherein the polarities of the first tab group (12) and the second tab group (13) are opposite, and the first tab group and the second tab group are connected to the same side of the main body part (11) along a winding axis (K) of a winding structure;And an end cover mounting step: the end cap assembly (102) is closed off the opening (1011), and the first tab group (12) is electrically connected with the electrode terminal (1022), and the second tab group (13) is electrically connected with the end cap body (1021).
- An apparatus (400) for manufacturing a battery cell (100), comprising:a component providing device (410) configured to provide a case (101), an end cap assembly (102), and an electrode assembly (10); wherein the case (101) has an opening (1011), the end cap assembly (102) includes an end cap body (1021) and an electrode terminal (1022) insulatively connected to the end cap body (1021), a center line of the electrode terminal (1022) being offset from the winding axis (K) by a preset distance in a radial direction of the winding structure; the electrode assembly (10) is in a rolled structure and includes: a main body part (11), a first tab group (12) and a second tab group (13), wherein the polarities of the first tab group (12) and the second tab group (13) are opposite, and the first tab group and the second tab group are connected to the same side of the main body part (11) along a winding axis (K) of a winding structure; andan end cap mounting device (420) configured to close the end cap assembly (102) to the opening (1011) and electrically connect the first tab group (12) with the electrode terminal (1022), and the second tab group (13) with the end cap body (1021).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2021/133475 WO2023092449A1 (en) | 2021-11-26 | 2021-11-26 | Battery cell, method and device for manufacturing battery cell, and power consuming device |
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| CN116793874B (en) * | 2023-08-28 | 2023-10-31 | 连云港普利特电子科技有限公司 | Lithium battery tab performance testing machine |
| CN116914381A (en) * | 2023-09-14 | 2023-10-20 | 宁德时代新能源科技股份有限公司 | Battery monomer, battery and power consumption device |
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| CN2701079Y (en) * | 2004-04-30 | 2005-05-18 | 肇庆市风华锂电池有限公司 | Battery sealing cover plate |
| WO2010025594A1 (en) * | 2008-09-04 | 2010-03-11 | Zhong Yang | Double electrodes type winding battery |
| CN209169206U (en) * | 2018-12-03 | 2019-07-26 | 宁德时代新能源科技股份有限公司 | Secondary cell |
| KR20200116336A (en) * | 2019-04-01 | 2020-10-12 | 삼성에스디아이 주식회사 | Secondary battery |
| CN211789108U (en) * | 2020-04-14 | 2020-10-27 | 广东国光电子有限公司 | Lithium ion battery |
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