CN113422174A - Current collector assembly, battery monomer and battery pack - Google Patents
Current collector assembly, battery monomer and battery pack Download PDFInfo
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- CN113422174A CN113422174A CN202110848739.8A CN202110848739A CN113422174A CN 113422174 A CN113422174 A CN 113422174A CN 202110848739 A CN202110848739 A CN 202110848739A CN 113422174 A CN113422174 A CN 113422174A
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- rivet
- current collector
- tabs
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- connection
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
本发明公开了一种集流体组件、电池单体和电池包，所述集流体组件包括：集流体包括多层极耳，导电连接组件包括铆钉、第一连接板和第二连接板，铆钉的第一端与第一连接板和第二连接板中的一个相连，铆钉的第二端依次刺穿多层极耳并与多层极耳电连接，且铆钉的第二端通过挤压第一连接板和第二连接板中的另一个以使第一连接板和第二连接板中的另一个向外凹陷形成嵌连接部，铆钉的第二端嵌入嵌连接部。根据本发明的集流体组件，通过采用铆钉穿透第一连接板、第二连接板和多层极耳，取消了传统连接工艺中极耳与铜箔之间的转接工艺，减少了极耳与铜箔转接时产生的金属碎屑，铆接时不需要预先进行冲孔，降低了生产难度，减少了制作工时。
The invention discloses a current collector assembly, a battery cell and a battery pack. The current collector assembly includes: the current collector includes multi-layer tabs, and the conductive connection assembly includes rivets, a first connection plate and a second connection plate. The first end is connected with one of the first connecting plate and the second connecting plate, the second end of the rivet pierces the multi-layer tabs in turn and is electrically connected with the multi-layer tab, and the second end of the rivet presses the first The other one of the connecting plate and the second connecting plate is recessed outward to form an embedded connecting portion, and the second end of the rivet is embedded in the embedded connecting portion. According to the current collector assembly of the present invention, by using rivets to penetrate the first connecting plate, the second connecting plate and the multi-layer tabs, the switching process between the tabs and the copper foil in the traditional connecting process is eliminated, and the number of tabs is reduced. The metal scraps generated when connecting with the copper foil do not need to be punched in advance during riveting, which reduces the difficulty of production and reduces the production time.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a current collector assembly, a battery monomer and a battery pack.
Background
In the prior art, holes are punched in the flexible connection, the lug and the flexible connecting sheet in advance, and the rivet penetrates through the preset holes punched in advance to rivet. According to the riveting mode, when the preset hole is drilled, the lug and the metal sheet are easy to generate metal scraps, and the metal scraps are easy to flow into the battery to cause short circuit in the battery to generate potential safety hazards. And the hole presetting procedure is complicated, and the production cost is increased.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a current collector assembly, a battery monomer and a battery pack.
The invention also provides a battery monomer.
The invention also provides a battery pack.
The current collector assembly according to the first aspect of the present invention includes: the current collector comprises a plurality of layers of tabs which are arranged in a stacking mode in the thickness direction of the tabs; conductive connection subassembly, conductive connection subassembly includes rivet, first connecting plate and second connecting plate, the first end of rivet with one in first connecting plate and the second connecting plate links to each other, the second end of rivet pierces through the multilayer in proper order utmost point ear and with the multilayer utmost point ear electricity is connected, just the rivet the second end is through the extrusion another in first connecting plate and the second connecting plate so that another outside sunken formation in first connecting plate and the second connecting plate inlays the portion of connecting, the rivet the second end embedding inlay the portion of connecting.
According to the current collector assembly, the rivet penetrates through the first connecting plate, the second connecting plate and the multiple layers of lugs, a switching process between the lugs and the copper foil in the traditional connecting process is omitted, metal scraps generated when the lugs are switched with the copper foil are reduced, the process flow is simplified, the second connecting plate, the lugs and the first connecting plate do not need to be punched in advance during riveting, the production difficulty is reduced, the manufacturing working hours are reduced, the labor cost is reduced, the connecting strength of the lugs and the connecting plates is improved through rivet connection, the connection is stable, the safety and the reliability of a battery monomer are guaranteed, riveting equipment is simple, the equipment cost is low, and the manufacturing process is stable.
In some embodiments, the second end of the rivet is bent to be deformed and formed into a deformed portion when the other of the first and second connection plates is pressed, the deformed portion being embedded in the embedded connection portion.
In some embodiments, the rivet comprises: the end part is positioned on one side of one of the first connecting plate and the second connecting plate, which is far away from the multilayer lug, and the riveting part is connected with the end part and is connected with the embedded connection part after penetrating through the multilayer lug.
In some embodiments, the rivet is formed in a ring shape extending in a circumferential direction of the end portion, and the rivet is bent outward to deform when pressing the other of the first and second connection plates.
In some embodiments, the cross section of the riveting part perpendicular to the thickness direction of the multiple layers of tabs is polygonal, circular or elliptical.
In some embodiments, the riveting portion extends in a columnar shape along the thickness direction of the multilayer tab, and the deformation portion formed by the extrusion end of the riveting portion when the other one of the first connecting plate and the second connecting plate is extruded comprises a plurality of support legs which are arranged at intervals around the central axis of the riveting portion and extend outwards towards directions away from each other.
In some embodiments, the cross-sectional area of the portion of the rivet to which the multi-layered tab is connected is the same in the thickness direction of the multi-layered tab.
Further, the height of the rivet is in the range of 2mm to 5 mm.
Further, the rivet includes a plurality of, a plurality of the rivet is arranged in the matrix.
Still further, the current collector comprises a plurality of pole pieces arranged in a stacked manner, wherein the pole pieces comprise the pole lugs; the pole piece includes: the first conductive layer and the second conductive layer are respectively covered on the two side surfaces of the supporting insulating layer in the thickness direction.
A battery cell according to a second aspect of the invention includes the current collector assembly of the above first aspect of the invention.
According to the single battery, the current collector assembly provided with the first aspect is applied to the single battery, so that the assembly difficulty of the single battery is reduced, the manufacturing time of the single battery is reduced, the labor cost is reduced, and the reliability of the single battery is ensured.
A battery pack according to a third aspect of the present invention includes the battery cell according to the above-described second aspect of the present invention.
According to the battery pack, the battery monomer in the second aspect is arranged, so that the safety performance of the battery pack is improved, the reliability of the battery pack is ensured, and the occurrence of danger is avoided.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic diagram of a battery cell according to an embodiment of the invention;
fig. 2 is a schematic view of the current collector assembly shown in fig. 1;
fig. 3 is a schematic diagram of a top view of the battery cell shown in fig. 1;
fig. 4 is a schematic view of another perspective of the battery cell shown in fig. 1;
fig. 5 is a schematic view of a battery cell according to another embodiment of the present invention;
fig. 6 is a schematic view of the current collector assembly shown in fig. 5;
fig. 7 is a schematic diagram of a top view of the battery cell shown in fig. 5;
fig. 8 is a schematic view of another perspective of the battery cell shown in fig. 5;
fig. 9 is a schematic view of a battery cell according to yet another embodiment of the present invention;
fig. 10 is a schematic view of the current collector assembly shown in fig. 9;
fig. 11 is a schematic diagram of a top view of the battery cell shown in fig. 9;
fig. 12 is a schematic view of another perspective of the battery cell shown in fig. 9;
fig. 13 is a schematic view of a battery cell according to yet another embodiment of the present invention;
fig. 14 is a schematic view of the current collector assembly shown in fig. 13;
fig. 15 is a schematic diagram of a top view of the battery cell shown in fig. 13;
fig. 16 is a schematic view of another perspective of the battery cell shown in fig. 13;
fig. 17 is a schematic view of a current collector;
FIG. 18 is a schematic view of the detection position of the detection probe;
FIG. 19 is a schematic view of another detection site of the detection probe.
Reference numerals:
the current collector assembly 100 is shown as having,
the current collector 1, the pole piece 11,
a tab 111, a first conductive layer 1111, a second conductive layer 1112, a support insulation layer 1113,
the conductive connection assembly 2 is provided with a conductive connection assembly,
a first connecting plate 22, a second connecting plate 23, an insertion connecting portion 231,
the number of the battery cells 1000 is such that,
a probe 2000.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A current collector assembly 100 according to an embodiment of the first aspect of the present invention is described below with reference to fig. 1-19.
As shown in fig. 2, the current collector assembly 100 according to the embodiment of the first aspect of the present invention includes: a current collector 1 and a conductive connection assembly 2.
Specifically, the current collector 1 includes a multilayer tab 111, the multilayer tab 111 is stacked in a thickness direction of the tab 111, the conductive connection assembly 2 includes a rivet 21, a first connection plate 22 and a second connection plate 23, a first end of the rivet 21 is connected to one of the first connection plate 22 and the second connection plate 23, a second end of the rivet 21 sequentially pierces the multilayer tab 111 and is electrically connected to the multilayer tab 111, and a second end of the rivet 21 forms an embedded connection portion 231 by pressing the other of the first connection plate 22 and the second connection plate 23 to outwardly recess the connection plate 23, and the second end of the rivet 21 is embedded in the embedded connection portion 231.
That is, the multi-layered tab 111 is stacked in the thickness direction of the tab 111, a first end of the rivet 21 (e.g., the upper end of the rivet 21 shown in fig. 2) is connected to one of the first connection plate 22 and the second connection plate 23, a second end of the rivet 21 (e.g., the lower end of the rivet 21 shown in fig. 2) pierces through the multi-layered tab 111, and the rivet 21 is electrically connected to each of the tabs 111, the second end of the rivet 21 (e.g., the lower end of the rivet 21 shown in fig. 2) presses the other of the first connection plate 22 and the second connection plate 23, the second end of the rivet 21 (e.g., the lower end of the rivet 21 shown in fig. 2) recesses the other of the first connection plate 22 and the second connection plate 23 outward, an insertion connection portion 231 is formed on the other of the first connection plate 22 and the second connection plate 23, and the second end of the rivet 21 (e.g., the lower end of the rivet 21 shown in fig. 2) is inserted into the insertion connection portion 231.
Referring to fig. 2, in the vertical direction, the multiple layers of tabs 111 are stacked up and down, the first connection plate 22 is located on the upper side of the multiple layers of tabs 111, the second connection plate 23 is located on the lower side of the multiple layers of tabs 111, the first connection plate 22 is connected to the upper end of the rivet 21, the lower end of the rivet 21 is adapted to pierce through the multiple layers of tabs 111, the rivet 21 is electrically connected to each layer of tabs 111, the lower end of the rivet 21 continuously presses the second connection plate 23 after contacting the second connection plate 23, so that the second connection plate 23 is pressed to form the embedded connection portion 231, and the lower end of the rivet 21 is embedded into the embedded connection portion 231. Therefore, the connection strength of the tab 111 and the second connection plate 23 is improved, the connection is stable, and the safety and reliability of the battery cell 1000 are guaranteed.
According to the current collector assembly 100 of the embodiment of the invention, the rivet 21 penetrates through the first connecting plate 22, the second connecting plate 23 and the multiple layers of tabs 111, so that a transfer process between the tabs 111 and copper foils in the traditional connecting process is eliminated, metal debris generated when the tabs 111 are transferred with the copper foils is reduced, the process flow is simplified, the second connecting plate 23, the tabs 111 and the first connecting plate 22 do not need to be punched in advance during riveting, the production difficulty is reduced, the manufacturing time is reduced, the labor cost is reduced, the connecting strength of the tabs 111 and the connecting plates is improved by connecting the rivet 21, the connection is stable, the safety and reliability of the battery monomer 1000 are ensured, the riveting equipment is simple, the equipment cost is low, and the manufacturing process is stable.
In other embodiments, the second connecting plate 23 is connected to a first end of a rivet 21, a second end of the rivet 21 is adapted to pierce through the multiple layers of tabs 111, the rivet 21 is electrically connected to each layer of tabs 111, the second end of the rivet 21 continuously presses the first connecting plate 22 after contacting the first connecting plate 22, so that the first connecting plate 22 is pressed to form a connection portion 231, and the second end of the rivet 21 is embedded in the connection portion 231.
In some embodiments of the present invention, the second end of the rivet 21 is bent and deformed while pressing the other one of the first and second connection plates 22 and 23 and is formed as a deformed portion 2121, and the deformed portion 2121 is embedded in the embedded connection portion 231. That is, as shown in fig. 2, the lower end of the rivet 21 is pressed against the second connecting plate 23 to be deformed, so that the lower end of the rivet 21 is bent to form a deformed portion 2121, and the deformed portion 2121 is fitted into the fitting connection portion 231 during the pressing. In this way, the embedded connection portion 231 and the deformation portion 2121 are engaged with each other, so that the rivet 21 is prevented from falling off from the current collector assembly 100, and the connection stability between the rivet 21 and the second connection plate 23 is improved.
In other embodiments, the second end of the rivet 21 presses the first connection plate 22 to be deformed, so that the second end of the rivet 21 is bent to form the deformation portion 2121, and the deformation portion 2121 is embedded in the embedded connection portion 231 during the pressing.
In addition, the second end of the rivet 21 is not limited to the bending angle thereof when bending.
In some embodiments of the invention, the rivet 21 comprises: the end part 211 and the riveting part 212, the end part 211 is located at the side of the riveting plate 22 away from the multilayer tab 111, and the riveting part 212 is connected with the end part 211, pierces the multilayer tab 111 and then is connected with the embedded connection part 231. That is, as shown in fig. 2, the rivet 21 includes two parts, namely, an end part 211 and a rivet part 212, the end part 211 is located on the upper side of the multilayer tab 111, the lower side of the end part 211 is connected to the upper end of the rivet part 212, and after the lower end of the rivet part 212 penetrates through the multilayer tab 111, the lower end of the rivet part 212 is connected to the caulking part 231, that is, the lower end of the rivet part 212 is formed as a deformed part 2121. Therefore, the rivet 21 has a simple structure, the riveting portion 212 is connected with the multi-layer tab 111 to ensure an overcurrent area, and the lower end of the riveting portion 212 is connected with the embedded connection portion 231 to ensure the safety and stability of the current collector assembly 100.
In other embodiments, the rivet 21 includes two parts, namely an end part 211 and a riveting part 212, the end part 211 is located at the lower side of the multi-layer tab 111, the upper side of the end part 211 is connected with the lower end of the riveting part 212, and after the upper end of the riveting part 212 pierces through the multi-layer tab 111, the upper end of the riveting part 212 is connected with the caulking part 231.
In some embodiments of the present invention, the rivet 212 is formed in a ring shape extending along the circumferential direction of the end 211, and the rivet 212 is bent outward and deformed when pressing the other of the first and second connection plates 22 and 23. As shown in fig. 1, the rivet 212 extends in the circumferential direction of the end 211, and the rivet 212 is formed in a ring shape, and the rivet 212 presses the second connection plate 23 after penetrating through each layer of the tab 111, and is bent and deformed in a radially outward direction during pressing of the second connection plate 23. Like this, promoted the stability of being connected of second connecting plate 23 with rivet 21, reduced the defective rate of battery, the difficult trouble that breaks down of battery package has prolonged the life of battery package, has reduced user's danger coefficient.
In other embodiments, the rivet 212 extends in the circumferential direction of the end 211, and the rivet 212 is formed in a ring shape, and the rivet 212 presses the first connection plate 22 after penetrating through each layer of the tab 111, and is bent and deformed in a radially outward direction during pressing of the first connection plate 22.
In still other embodiments of the present invention, the rivet 212 is formed in a ring shape extending in a circumferential direction of the end portion 211, a lower end of the rivet 212 (e.g., a lower end of the rivet 212 shown in fig. 2) presses the other of the first connection plate 22 and the second connection plate 23 after penetrating through each layer of the tab 111, the other of the first connection plate 22 and the second connection plate 23 is pressed and deformed to form the caulking portion 231, and the lower end of the rivet 212 is connected to the caulking portion 231.
In some embodiments of the present invention, the cross section of the riveting portion 212 perpendicular to the thickness direction of the multilayer tab 111 is polygonal, circular or elliptical, so as to meet the riveting requirements of different composite current collectors 1.
Preferably, the rivet portion 212 of the rivet 21 has a circular cross section, and the circular area is the largest when the circumferences are the same, so that the contact area between the circular rivet 21 and the tab 111 is the largest when the contact area between the tab 111 and the rivet 21 is the same, the flow area between the rivet 21 and the tab 111 is increased, the resistance in the battery is reduced, and the safety performance of the battery is improved.
In still other embodiments of the present invention, the rivet 212 extends in a cylindrical shape along the thickness direction of the multi-layer tab 111, and the deformation part 2121 formed by pressing the rivet 212 when pressing the other one of the first connection plate 22 and the second connection plate 23 includes a plurality of legs 2122, and the plurality of legs 2122 are arranged at intervals around the central axis of the rivet 212 and extend outward in directions away from each other.
That is, the rivet 212 may also be formed in a column shape, as shown in fig. 10, the rivet 212 extends in the up-down direction, the lower end of the rivet 212 is a pressing end, the pressing end is formed as a deformation part 2121 in the process of pressing the connecting plate 23, the deformation part 2121 is formed with a plurality of legs 2122, the plurality of legs 2122 are arranged at intervals around the central axis of the rivet 212, and the plurality of legs 2122 extend outward toward directions away from each other to connect with the fitting part 231 of the connecting plate 23. Therefore, the connection strength of the rivet 21 is improved, the rivet 21 is prevented from being broken in the transportation or use process, or the rivet 21 is prevented from being separated from the connecting plate 23, and the connection reliability of the single battery 1000 is guaranteed.
In other embodiments, the upper end of the rivet 212 is a pressing end, the pressing end is formed as a deformation part 2121 during pressing of the first connecting plate 22, the deformation part 2121 is formed with a plurality of legs 2122, the plurality of legs 2122 are spaced around the central axis of the rivet 212, and the plurality of legs 2122 extend outward toward directions away from each other to connect with the engagement part 231 of the first connecting plate 22.
In some embodiments of the present invention, the cross-sectional area of the portion of the rivet 21 connected to the multi-layer tab 111 is the same in the thickness direction of the multi-layer tab 111. As shown in fig. 2, 10 and 14, in the vertical direction, the cross-sectional areas of the connecting portions 212 of the rivets 21 and the multiple layers of tabs 111 are the same, so that the contact area between each layer of tabs 111 and the rivet 21 is the same, the overcurrent capacity between each layer of tabs 111 and the rivet 21 is the same, and local heating caused by different overcurrent capacities is avoided, thereby further improving the safety and reliability of the current collector assembly 100 and improving the safety performance of the battery pack.
In one embodiment of the present invention, as shown in fig. 1, in the up-down direction, the multi-layer tab 111 is stacked up and down, the first connection plate 22 is located on the upper side of the multi-layer tab 111, the second connection plate 23 is located on the lower side of the multi-layer tab 111, the rivet 21 includes an end portion 211 and a riveting portion 212, the end portion 211 is located on the upper side of the multi-layer tab 111, the first connection plate 22 is connected to the upper end of the rivet 21, the lower end of the rivet 21 pierces through the multi-layer tab 111, the rivet 21 is electrically connected to each of the multi-layer tab 111, the lower end of the rivet 21 continuously presses the second connection plate 23 after contacting the second connection plate 23, the lower end of the rivet 21 presses the second connection plate 23 to deform, the second connecting plate 23 is pressed to form the fitting portion 231, the lower end of the rivet 21 is bent to form the deformation portion 2121, the deformation portion 2121 is fitted into the fitting portion 231 during the pressing, and the lower end of the rivet 21 is fitted into the fitting portion 231.
In another embodiment of the present invention, in the up-down direction, the multi-layer tabs 111 are stacked up and down, the first connection plate 22 is located on the upper side of the multi-layer tabs 111, the second connection plate 23 is located on the lower side of the multi-layer tabs 111, the rivet 21 includes an end portion 211 and a riveted portion 212, the end portion 211 is located on the lower side of the multi-layer tabs 111, the second connection plate 23 is connected to an end portion of the rivet 21, an upper end of the rivet 21 pierces through the multi-layer tabs 111, the rivet 21 is electrically connected to each of the multi-layer tabs 111, the upper end of the rivet 21 continuously presses the first connection plate 22 after contacting the first connection plate 22, the upper end of the rivet 21 presses the first connection plate 22 to deform, the first connection plate 22 is pressed to form the fitting connection part 231, the upper end of the rivet 21 is bent to form the deformation part 2121, the deformation part 2121 is fitted into the fitting connection part 231 during the pressing, and the upper end of the rivet 21 is fitted into the fitting connection part 231.
In some embodiments of the present invention, the height of the rivet 21 is in a range from 2mm to 5mm, which can be selected according to the thickness of the tab 111, so as to meet the requirements of tabs 111 with different thicknesses, expand the application range of the rivet 21, and reduce the production cost of the current collector assembly 100.
For example, the height of the rivet 21 may be: 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4.0mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5.0mm, and the like.
In some embodiments of the present invention, the rivet 21 comprises a plurality of rivets 21, and the plurality of rivets 21 are arranged in a matrix. The number of rows of the rivets 21 is more than or equal to 1 and less than or equal to 5, the number of columns of the rivets 21 is more than or equal to 2 and less than or equal to 15, and the total number of the rivets 21 is more than or equal to 2 and less than or equal to 20, so that the riveting requirements of the composite current collectors 1 made of different materials, shapes and thicknesses are met, the connection strength of the battery cell 1000 is ensured, and the fault tolerance rate in the riveting process is improved.
For example, the number of rows of rivets 21 may be one, two, three, four, five; the number of rows of rivets 21 may be 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15; the total number of rivets 21 may be 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20.
The following lists the arrangement of the rivets 21 on one connection plate 23 in the current collector assembly 100 of four specific embodiments.
In the first embodiment, referring to fig. 1 to 4, the rivet portion 212 of the rivet 21 is formed in a ring shape, the cross section of the rivet portion 212 of the rivet 21 is circular, the rivets 21 are arranged in four rows and three columns, and the total number of the rivets 21 is 12.
In the second embodiment, referring to fig. 5 to 8, the rivet portion 212 of the rivet 21 is formed in a ring shape, the cross section of the rivet portion 212 of the rivet 21 is circular, the rivets 21 are arranged in two rows and three columns, and the total number of the rivets 21 is 6.
In the third embodiment, as shown in fig. 9 to 12, the connecting portion of the rivet 21 is formed in a columnar shape, the cross section of the riveting portion 212 of the rivet 21 is rectangular, the rivets 21 are arranged in two rows and three columns, and the total number of the rivets 21 is 6.
In the fourth embodiment, as shown in fig. 13 to 16, the connecting portion of the rivet 21 is formed in a columnar shape, the cross section of the rivet portion 212 of the rivet 21 is rectangular, the rivets 21 are arranged in two rows and three columns, and the total number of the rivets 21 is 6.
In some embodiments of the present invention, the current collector 1 comprises a plurality of pole pieces 11 arranged in a stack, each pole piece 11 comprising a tab 111, the tab 111 comprising: a supporting insulating layer 1113, and a first conductive layer 1111 and a second conductive layer 1112 which cover both side surfaces in the thickness direction of the supporting insulating layer 1113, respectively. Referring to fig. 17, a supporting insulating layer 1113 is positioned between a first conductive layer 1111 and a second conductive layer 1112, and the first conductive layer 1111 and the second conductive layer 1112 are respectively covered on an upper surface and a lower surface of the supporting insulating layer 1113.
Optionally, the support insulating layer 1113 is a composite polymer insulating layer.
In some embodiments, the rivet 21 may be made of copper, copper-nickel alloy, copper-silver alloy, stainless steel 304, stainless steel 316L, or titanium alloy, the hardness of the rivet 21 should be within a range of 50HBS ≦ C ≦ 300HBS, the hardness of the rivet 21 is lower than 50HBS, the rivet 21 cannot be guaranteed to penetrate through one of the first connecting plate 22 and the second connecting plate 23 and the multi-layer tab 111, the hardness of the rivet 21 is higher than 300HBS, and the rivet 21 cannot be guaranteed to be folded and embedded into the embedded connection portion 231 when contacting the other of the first connecting plate 22 and the second connecting plate 23.
In order to ensure that the rivets 21 with different cross-sectional shapes have the same overcurrent capacity, a resistance tester with four probes 2000 is adopted to perform resistance detection on the riveted current collector assembly 100, as shown in fig. 18-19, when the distance L between the center of the first rivet 21 close to the tab 111 and the single-layer tab 111 is 30mm in the test of the probes 2000, the resistance is equal to or greater than 5m Ω and equal to or less than 30m Ω; similarly, when the rivet 21 is square or triangular, and the distance L between the center of the rivet 21 and the single-layer tab 111 is 30mm, the resistance between two points satisfies 5m Ω ≦ R ≦ 30m Ω, and the connection between the rivet 21 and the tab 111 is more stable as the resistance is smaller. Therefore, the connection strength is ensured, and the safety and reliability of the battery cell 1000 are further ensured.
A battery cell 1000 according to an embodiment of the second aspect of the present invention includes the current collector assembly 100 of the above-described embodiment of the first aspect of the present invention.
According to the single battery 1000 of the embodiment of the invention, the current collector assembly 100 provided with the first aspect embodiment is applied to the single battery 1000, so that the assembly difficulty of the single battery 1000 is reduced, the manufacturing time of the single battery 1000 is reduced, the labor cost is reduced, and the reliability of the single battery 1000 is ensured.
The battery pack according to the embodiment of the third aspect of the present invention includes the battery cell 1000 according to the embodiment of the second aspect of the present invention described above.
According to the battery pack provided by the embodiment of the invention, the battery monomer 1000 in the embodiment of the second aspect is arranged, so that the safety performance of the battery pack is improved, the reliability of the battery pack is ensured, and the occurrence of danger is avoided.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (12)
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| CN202110848739.8A CN113422174A (en) | 2021-07-27 | 2021-07-27 | Current collector assembly, battery monomer and battery pack |
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| CN113422174A true CN113422174A (en) | 2021-09-21 |
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| WO2024065146A1 (en) * | 2022-09-27 | 2024-04-04 | 宁德时代新能源科技股份有限公司 | Battery cell, battery cell production method, battery and electric device |
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Address after: 361006 room 201-1, complex building 5, No. 11, Butang Middle Road, industrial base, Xiamen Torch High tech Zone (Tongxiang), Xiamen, Fujian Applicant after: Xiamen Haichen Energy Storage Technology Co.,Ltd. Address before: 361006 room 201-1, complex building 5, No. 11, Butang Middle Road, industrial base, Xiamen Torch High tech Zone (Tongxiang), Xiamen, Fujian Applicant before: Xiamen Haichen New Energy Technology Co.,Ltd. |