CN115377623B - Current collector, battery pack and electric equipment - Google Patents
Current collector, battery pack and electric equipment Download PDFInfo
- Publication number
- CN115377623B CN115377623B CN202211153556.5A CN202211153556A CN115377623B CN 115377623 B CN115377623 B CN 115377623B CN 202211153556 A CN202211153556 A CN 202211153556A CN 115377623 B CN115377623 B CN 115377623B
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- protrusions
- current collector
- main body
- body portion
- protrusion
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- 238000004804 winding Methods 0.000 claims abstract description 16
- 238000003466 welding Methods 0.000 abstract description 25
- 230000000694 effects Effects 0.000 description 8
- 238000004080 punching Methods 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
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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
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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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
-
- 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
- H01M50/30—Arrangements for facilitating escape of gases
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention discloses a current collector, a battery pack and electric equipment. The current collector includes: a main body part, which is provided with a first surface and a second surface which are arranged oppositely; at least one first bulge, wherein the first bulge is arranged on the first surface; the second bulges are arranged on the second face, and the second bulges and the first bulges are arranged at intervals along the circumferential direction of the main body part. The current collecting piece is provided with the bulges on the first surface and the second surface, so that the flatness of the winding core and the current collecting piece and the flatness between the battery cover plate and the current collecting piece during welding can be improved simultaneously, the pressure release channel can be increased, and the timely pressure release of the battery core is ensured; furthermore, the pressure release channel with the required size can be further obtained by adjusting the protruding heights of the first protrusion and the second protrusion, so that the safety of the battery cell is ensured.
Description
Technical Field
The invention belongs to the field of batteries, and particularly relates to a current collector, a battery pack and electric equipment.
Background
In the existing cylindrical battery, in order to meet the electric connection between the cover plate structure and the winding core, the cover plate is usually connected with the current collecting disc body in an electric conduction way through a foldable connecting sheet, after the battery is assembled, the disc body is welded with the electrode lugs, the connecting sheet is arranged in a folding way in the battery and is connected with the electrode posts, and the battery cover plate and the current collecting disc are assembled in a complex way. In order to solve this problem, there is a method of directly welding the positive electrode current collecting plate and the battery bottom aluminum sheet (i.e., positive electrode cover plate). However, when the cylindrical battery core has higher capacity and longer length, explosion-proof valves are usually required to be arranged at two ends of the battery core, if the explosion-proof valves are arranged on the outer surface of the positive electrode cover plate, and one side of the positive electrode cover plate, which faces the winding core, is directly welded with the current collecting disc, the problem that a pressure release channel is insufficient to guide generated high-pressure gas to the explosion-proof valves exists.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, one purpose of the invention is to provide a current collector, a battery pack and electric equipment, so that the aims of improving the flatness of a welding area, enlarging a pressure release channel and ensuring timely pressure release of a battery core are achieved.
In one aspect of the invention, a current collector is provided. According to an embodiment of the present invention, the current collector includes: a main body portion having a first face and a second face disposed opposite each other; at least one first bulge, wherein the first bulge is arranged on the first surface; the second bulges are arranged on the second surface, and the at least one second bulge and the at least one first bulge are arranged at intervals along the circumferential direction of the main body part. Compared with the prior art, the current collector has the advantages that the bulges are arranged on the first surface and the second surface, so that the flatness of the winding core and the current collector and the flatness between the battery cover plate and the current collector during welding can be improved simultaneously, the pressure release channel can be increased, and the timely pressure release of the battery core is ensured; furthermore, the pressure release channel with the required size can be further obtained by adjusting the protruding heights of the first protrusion and the second protrusion, so that the safety of the battery cell is ensured.
In addition, the current collector according to the above embodiment of the present invention may have the following additional technical features:
optionally, the body portion is in the shape of a circular flat plate.
Optionally, the current collector includes a plurality of the first protrusions and a plurality of the second protrusions, and the plurality of the first protrusions and the plurality of the second protrusions are alternately arranged at intervals along the circumferential direction of the body portion.
Optionally, the first projection and the second projection each extend from a circumferential edge of the main body portion toward a central region of the main body portion, and an extension length of the second projection in the main body portion radial direction is smaller than an extension length of the first projection in the main body portion radial direction.
Optionally, the first protrusions are uniformly spaced along the circumference of the current collector, the second protrusions are uniformly spaced along the circumference of the current collector, and each second protrusion is equidistant from two first protrusions adjacent thereto.
Optionally, a step surface is arranged on the first surface in a region corresponding to the second protrusion, and a groove is arranged on the second surface in a region corresponding to the first protrusion.
Optionally, the height of the first protrusion is 0.1-0.3 mm.
Optionally, the second protrusion has a protrusion height of no more than 50% of the thickness of the body portion.
Optionally, each of the second protrusions has an extension in the radial direction of the main body portion of no more than 30% of the diameter of the main body portion.
Optionally, the second protrusion has a protrusion height of 10 to 50% of the thickness of the main body portion.
Optionally, the height of the second protrusion is 0.1-0.6 mm.
Optionally, the width direction of the first protrusions is perpendicular to the radial direction of the main body portion, and a ratio of the width of each of the first protrusions to the diameter of the main body portion is not less than 1:8.6.
optionally, the width direction of the first protrusions is perpendicular to the radial direction of the main body portion, and the width of each first protrusion is not less than 5mm.
Optionally, a ratio of a minimum spacing between each of the first protrusions and a center of the body portion to a diameter of the body portion is no greater than 3:8.6.
optionally, a minimum distance between each of the first protrusions and a center of the main body portion is not greater than 15mm.
Optionally, the second protrusions are circular arc-shaped protrusions extending from a circumferential edge of the main body portion toward a central region of the main body portion, and an angle of each of the second protrusions in the circumferential direction of the main body portion is not less than 60 degrees.
Optionally, the second protrusions are circular arc-shaped protrusions extending from a circumferential edge of the main body portion toward a central region of the main body portion, and a total angle of the plurality of second protrusions in the circumferential direction of the main body portion is not less than 180 degrees.
Optionally, the thickness between the step face to the surface of the second protrusion facing away from the first face is no greater than the thickness of the body portion; and/or the ratio of the thickness between the bottom of the groove and the surface of the first protrusion facing away from the second face to the thickness of the main body portion is (0.375-0.625): 1.
optionally, the extension length of each of the second protrusions in the radial direction of the main body portion is 7.5 to 20% of the diameter of the main body portion.
Optionally, the current collector includes three of the first protrusions and three of the second protrusions.
Optionally, the region of the main body portion where the first protrusion and the second protrusion are not provided is provided with at least one exhaust through hole.
Optionally, the first surface is taken as a projection surface, and the total orthographic projection area of the exhaust through holes on the projection surface is not more than 50% of the area of the projection surface.
Optionally, the total area of orthographic projection of the exhaust through holes on the projection surface is 10-40% of the area of the projection surface.
Optionally, the main body portion is in a circular flat plate shape, the current collector comprises a plurality of first protrusions and a plurality of second protrusions, the plurality of first protrusions and the plurality of second protrusions are alternately arranged along the circumferential direction of the main body portion at intervals, the at least one exhaust through hole comprises a first sub exhaust through hole and a plurality of second sub exhaust through holes, the first sub exhaust through hole and the main body portion are arranged in a concentric circle, and the plurality of first protrusions are arranged around the first sub exhaust through hole at intervals along the circumferential direction of the main body portion.
Optionally, the plurality of second sub-exhaust through holes are distributed at intervals in an area surrounded by the plurality of first protrusions and the plurality of second protrusions.
Optionally, the current collector satisfies at least one of the following conditions: a plurality of the second sub-exhaust through holes are annularly arranged in the circumferential direction of the main body portion; the plurality of second sub-exhaust through holes are arranged in a row in a radial direction of the main body portion.
In yet another aspect of the invention, a battery is provided. According to an embodiment of the present invention, the battery includes: a housing; a bare cell housed within the housing; and the current collector is characterized in that at least one first protrusion is connected with the bare cell, and at least one second protrusion is connected with the shell. The battery has all of the features and effects described with respect to the current collector described above and will not be described in detail herein. In general, the battery is simpler in structure, high in preparation efficiency and good in operability, and the pressure release channel is large, so that the pressure can be released in time during thermal runaway, and the safety is higher.
In yet another aspect of the invention, a battery pack is provided. According to an embodiment of the invention, the battery pack comprises the battery described above or the current collector described above. The battery pack has all of the features and effects described with respect to the battery and current collector described above, and will not be described again here. Overall, the battery pack is more safe.
In yet another aspect, the present invention provides a powered device comprising a battery pack as described above or a battery as described above. The powered device has all the features and effects described for the battery pack and the battery described above, and will not be described here again.
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
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is a schematic view of a current collector according to an embodiment of the present invention.
Fig. 2 is a schematic structural view of a current collector according to still another embodiment of the present invention.
Fig. 3 is a schematic view of a structure of a battery according to an embodiment of the present invention.
Reference numerals:
100-collector; 10-a first side; 11-a first bump; 12-step surface; 20-a second side; 21-a second bump; 22-grooves; 30-an exhaust through hole; 31-a first sub-exhaust through hole; 32-a second sub-exhaust through hole; 40-a main body; 200-a housing; 210-housing opening; 220-cover plate.
d 1 -the extension of the second protrusion in the radial direction of the body portion; d, d 2 -the extension of the first protrusion in the radial direction of the body portion; d, d 3 -a thickness between the step surface and a surface of the second protrusion facing away from the first surface; d, d 4 -a thickness of the body portion; d, d 5 -a thickness between the bottom of the groove and the surface of the first protrusion facing away from the second face; d, d 6 -a width of the first protrusion; d, d 7 -a minimum distance between the first protrusion and the centre of the body portion.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "center," "length," "width," "thickness," "upper," "lower," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, terms such as "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly attached, detachably attached, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances. In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In one aspect of the invention, a current collector is provided. As understood with reference to fig. 1-2, the current collector 100 includes: a main body 40, the main body 40 having a first surface 10 and a second surface 20 disposed opposite to each other; at least one first protrusion 11, the first protrusion 11 being provided on the first face 10; at least one second protrusion 21, the second protrusion 21 is provided on the second face 20, and the at least one second protrusion 21 and the at least one first protrusion 11 are arranged at intervals along the circumferential direction of the main body portion 40. Wherein when the current collector is used for assembling a battery, one of the first face 10 and the second face 20 of the main body portion 40 faces the battery cover plate, and the other faces the battery interior, for example, according to a specific example of the present invention, the first face may be directed toward the battery interior and connected to the electrode tab by the first protrusion (e.g., welded), and the second face may be directed toward the battery cover plate and connected to the battery cover plate by the second protrusion (e.g., welded). Compared with the prior art, the current collector has the advantages that the bulges are arranged on the first surface and the second surface, so that the flatness of the winding core and the current collector and the flatness between the battery cover plate and the current collector during welding can be improved simultaneously, the pressure release channel can be increased, and the timely pressure release of the battery core is ensured; furthermore, the pressure release channel with the required size can be further obtained by adjusting the protruding heights of the first protrusion and the second protrusion, so that the safety of the battery cell is ensured. It will be appreciated that the surfaces of the first projection 11 and the second projection 21 on the side facing away from the main body portion may be respectively and independently planar, whereby the flatness of the winding core and the current collector and the flatness between the battery cover and the current collector during welding may be further ensured, and the current collector and the winding core and the battery cover may be better attached together.
The current collector according to the above-described embodiment of the present invention will be described in detail with reference to fig. 1 to 2.
According to an embodiment of the present invention, it is understood with reference to fig. 1 that the body portion of the current collector 100 may have a circular flat plate shape, thereby allowing the current collector to be widely used in cylindrical batteries and facilitating the attachment between the winding core and the current collector and between the battery cover and the current collector.
1-2, the current collector 100 may include a plurality of first protrusions 11 and a plurality of second protrusions 21, and the plurality of first protrusions 11 and the plurality of second protrusions 21 may be alternately arranged at intervals along the circumferential direction of the body part 40. When the current collector is in contact welding with the electrode lug or the battery cover plate in a large area, the flatness between the current collector and the winding core and the battery cover plate is not good, by adopting the arrangement, the flatness between the winding core and the current collector and the flatness between the battery cover plate and the current collector during welding can be improved simultaneously, and the welding position between the current collector and the electrode lug and the battery cover plate can be ensured to be in consideration of a plurality of areas in the circumferential direction of the current collector simultaneously, so that the contact positioning between the current collector and the battery pole piece and the battery cover plate is firmer; in addition, the adoption of the arrangement is beneficial to improving the flow passing area and the flow guiding capability of the current collector. Further, according to an embodiment of the present invention, the plurality of first protrusions 11 may be uniformly spaced along the circumference of the body part 40, for example, may be uniformly spaced along the circumference of the current collector (body part) around the center of the current collector (body part), while the plurality of second protrusions 21 may also be uniformly spaced along the circumference of the body part 40, and the distance (which may be understood as circumferential distance) of each second protrusion 21 to two first protrusions 11 adjacent thereto may be equal, thereby further contributing to the improvement of the stability of the contact positioning of the current collector with the winding core and the battery cover plate.
According to an embodiment of the present invention, as will be understood from fig. 1 to 2, the first protrusion 11 and the second protrusion 21 may extend along the circumferential edge of the main body portion 40 toward the central region of the main body portion 40, respectively, independently, and the second protrusion 21 may extend in the radial direction of the main body portion 40 by a length d 1 Less than the extension d of the first projection 11 in the radial direction of the body portion 2 . The first bulge and the electrode lug can be welded, and the extending length of the first bulge in the radial direction of the main body part is longer, so that the welding position of the current collector and the lug can be better considered in the area and the peripheral area of the battery close to the center of the current collector, the stability of contact positioning of the current collector and a battery pole piece is further improved, and the current passing area and the current guiding capacity of the current collector are further improved. In addition, the forming modes of the first protrusions and the second protrusions are not particularly limited, and when the first protrusions and the second protrusions are formed by stamping, since the protruding directions of the first protrusions and the second protrusions are opposite, the stamping modes of the first face and the second face are also opposite, and the overall strength of the current collector can be further ensured by making the extension length of the second protrusions in the radial direction of the main body part smaller than the extension length of the first protrusions in the radial direction of the main body part.
According to an embodiment of the present invention, as will be appreciated in connection with fig. 1-2, the area of the first face 10 corresponding to the second protrusion 21 may be provided with a stepped face 12, and the area of the second face 20 corresponding to the first protrusion 11 may be provided with a recess 22, whereinThe thickness between the step surface 12 and the second surface 20 is made smaller than the thickness d of the main body 40 4 Through the setting of step face and recess, can further increase the pressure release passageway, can in time release when guaranteeing that the battery is out of control, improve the security of battery. In addition, the forming manner of the step surface 12 and the groove 22 is not particularly limited, and a person skilled in the art may flexibly select the forming manner according to actual needs, and preferably may press the first surface 10 and the second surface 20 of the main body 40, so that the step surface 12 and the second protrusion 21 are formed on the first surface 10 and the second surface 20 simultaneously, and the groove 22 and the protrusion are formed on the second surface 20 and the first surface 10 simultaneously, and the protrusion may be directly used as the first protrusion 11 to be welded with the electrode tab, or may be further thinned and then used as the first protrusion 11 to be welded with the electrode tab, and then be welded with the tab after being thinned, so that the welding power when the current collector and the tab are welded can be further reduced.
According to the embodiment of the invention, the thickness d between the step surface 12 and the surface of the second protrusion 21 facing away from the first surface 10 can be made 3 Not greater than the thickness d of the main body 40 4 This is not only advantageous for further enlarging the pressure relief channel, but also for forming the step surface 12 and the second protrusion 21 simultaneously by means of stamping.
According to an embodiment of the invention, the thickness d between the bottom of the groove 22 and the surface of the first projection 11 facing away from the second face 20 5 And thickness d of the main body 4 The ratio of (2) may be (0.375-0.625): 1, for example, may be 0.4/1, 0.5/1, or 0.6/1, etc., as described above, the recess 22 may be obtained by punching the second face 20 of the main body portion, and forming a protrusion on the second face accordingly, if the protrusion is not thinned or the thickness of the protrusion is smaller, it is not advantageous to reduce the welding power between the current collector and the tab when it is used as the first protrusion, and if the thickness of the protrusion is too large, i.e., the thickness between the bottom of the recess and the surface of the first protrusion facing away from the second face 20 is relatively small, and the overall strength of the current collector is reduced, in the present invention, by controlling the thickness between the bottom of the recess and the surface of the first protrusion facing away from the second face 20 to be within the above range, the overall strength of the current collector is further reduced on the basis of ensuring the overall strength of the current collectorWelding power of the current collector and the tab.
According to the embodiment of the present invention, as understood from fig. 1, the height of the first protrusion 11 may be 0.1 to 0.3mm, for example, may be 0.15mm, 0.2mm or 0.25mm, if the height of the first protrusion is too small, the effect of improving the flatness between the current collector and the tab during welding is not obvious, and if the height of the first protrusion is too high, the welding power between the current collector and the tab is larger, in the present invention, by controlling the height of the first protrusion 11 to be in the above range, the flatness between the current collector and the tab can be further ensured and the welding power between the two can be effectively reduced. On the basis of this, the thickness d between the bottom of the recess 22 and the surface of the first projection 11 facing away from the second surface 20 can be further adapted 5 And thickness d of the main body 4 The ratio of (3) is (0.375-0.625): 1, for example, when the thickness of the main body portion 40 is 1mm, the thickness d between the bottom of the groove 22 and the surface of the first projection 11 facing away from the second face 20 may be made 5 Is 0.375-0.625 mm, thereby ensuring the proper groove depth of the groove and increasing the pressure release channel on the basis of ensuring the integral strength of the current collector.
According to an embodiment of the present invention, as will be appreciated in connection with FIG. 2, the second protrusion 21 may have a protrusion height not greater than the thickness d of the body portion 4 For example, according to a specific example of the present invention, the height of the second protrusion 21 may be 10 to 50%, 40%, 30%, 25%, 20%, 15% or 10% of the thickness of the main body, if the height of the second protrusion is too small, the effect of improving the flatness between the current collector and the battery cover plate during welding is not obvious, and if the height of the second protrusion is too high when the second protrusion is obtained by punching the first surface of the main body, the overall strength of the current collector is affected.
According to an embodiment of the present invention, as understood from fig. 2, the height of the second protrusions 21 may be 0.1 to 0.6mm, for example, 0.2mm, 0.3mm, 0.4mm, or 0.5mm, etc., and as described above, for the thickness range of the existing current collector (body part), the flatness between the current collector and the battery cover plate may be ensured and the overall strength of the current collector may be advantageously ensured by controlling the height of the second protrusions to the above range.
According to an embodiment of the present invention, as will be understood from fig. 1, the width direction of the first protrusions 11 is perpendicular to the radial direction of the main body portion 40, and the width d of each first protrusion 11 6 The ratio to the diameter of the main body portion 40 may be not less than 1:8.6 the inventors have found that if this distance is small, not only will the welding difficulty be increased, but also the flow area of the current collector will be affected, in the present invention by controlling d 6 In the above range, the welding operation is facilitated, and the flow passage area and the flow guiding capability of the current collector are improved. Further, according to a specific example of the present invention, the width d of each first protrusion 11 is outside the direction toward the center region of the current collector (main body portion) and the direction away from the center region of the current collector (main body portion) 6 The direction from inside to outside can be kept unchanged or can be gradually increased.
According to an embodiment of the present invention, as will be understood from fig. 1, the width direction of the first protrusions 11 is perpendicular to the radial direction of the main body portion 40, and the width d of each first protrusion 11 6 Can be not less than 5mm, as described above, for the diameter range of the existing current collector (main body part), the inventors found that if the distance is small, not only the welding difficulty is increased, but also the flow area of the current collector is affected, in the present invention, by controlling d 6 In the above range, the welding operation is facilitated, and the flow passage area and the flow guiding capability of the current collector are improved.
According to an embodiment of the present invention, the minimum distance d between each first protrusion 11 and the center of the current collector body 40 7 The ratio to the diameter of the main body portion 40 may be not greater than 3:8.6, e.g. the distance d 7 The ratio to the diameter of the body portion may be 2.5/8.6, 2/8.6, 1.5/8.6 or 1/8.6, etc., if the spacing d 7 Too large, not only can influence the stability of contact positioning of the current collector and the central area of the winding core, but also can influence the welding area of the current collector and the electrode lug, so that the overcurrent area is reduced, and the inventionIn the middle of the light by controlling d 7 In order to achieve the above-mentioned range, not only the stability of contact positioning of the current collector and the central area of the winding core can be ensured, but also the flow area and the flow conductivity of the current collector can be improved.
According to an embodiment of the present invention, the minimum distance d between each first protrusion 11 and the center of the current collector body 40 7 May be not greater than 15mm, for example, may be not greater than 14mm, 12mm, 10mm, 8mm, etc., as described above, for the diameter range of the existing collector body portion, the present invention is controlled by controlling d 7 In order to achieve the above-mentioned range, not only the stability of contact positioning of the current collector and the central area of the winding core can be ensured, but also the flow area and the flow conductivity of the current collector can be improved.
According to an embodiment of the present invention, the extension length d of each second protrusion 21 in the radial direction of the collector body part 40 1 The distance d may be not more than 30% of the diameter of the main body 40, for example, 15 to 30%, 25%, 20%, 15%, 10% or 5% of the diameter of the main body 1 When the first bulge and the second bulge are obtained by punching, the whole punching area of the main body part is too large, the distance between the first bulge and the second bulge with opposite punching directions is too small, and the whole strength of the current collector is influenced by the first bulge and the second bulge, and the d is controlled in the invention 1 In this range, the current collector may further have a good overall strength. Further, the respective second protrusions 21 extend a distance d in the radial direction of the main body portion 40 1 The diameter of the main body 40 may be 7.5 to 30%, for example, 7.5 to 20%, and the inventors found that the distance d is as follows 1 Too small, not only is the welding stability of the current collector and the battery cover plate difficult to ensure, but also the flow guiding capability of the current collector can be influenced, and the invention is characterized in that the current collector is controlled by controlling d 1 In order to achieve the above-mentioned advantages, the overall strength of the current collector, the welding stability with the battery cover plate and the current guiding capability can be better considered.
According to the embodiment of the present invention, the second protrusions 21 may be circular arc-shaped protrusions extending from the circumferential edge of the body part 40 toward the central region of the body part 40, and the angle (which may be understood as an arc or a central angle) of each second protrusion 21 in the circumferential direction of the body part may be not less than 60 degrees, for example, may be not less than 65 degrees or 70 degrees, etc., and the inventors found that if the arc of the second protrusions in the circumferential direction of the body part is too small, it is also difficult to ensure the welding stability of the current collector and the battery cover plate, and also the current guiding capability of the current collector may be affected. Further, the total angle of the plurality of second protrusions 21 in the circumferential direction of the body portion may be not less than 180 degrees, whereby the welding stability and the current guiding capability of the current collector and the battery cover plate may be better ensured.
The number of the first protrusions 11 and the second protrusions 21 is not particularly limited according to the embodiment of the present invention, and one skilled in the art may flexibly select, for example, 3, 4, 5, etc. each independently according to actual needs. According to a specific example of the present invention, it is understood with reference to fig. 1 and 2 that the number of the first protrusions 11 and the second protrusions 21 may be 3, respectively and independently, i.e., the current collector may include three first protrusions 11 and three second protrusions 21, whereby not only can the current collector be ensured to have superior stability when welded with the winding core and the battery cover plate, but also the operation process is facilitated to be simplified.
According to the embodiment of the present invention, as will be understood with reference to fig. 1 and 2, the area of the main body 40 where the first protrusion 11 and the second protrusion 21 are not provided may also be provided with at least one exhaust through hole 30. It is to be understood that the shape, number and arrangement of the exhaust through holes 30 are not particularly limited, and those skilled in the art can flexibly select according to actual needs, for example, the exhaust through holes 30 may be circular, oval, rectangular, triangular or other polygonal, etc. according to specific examples of the present invention; as another example, according to a specific example of the present invention, the exhaust through holes 30 may be single or plural; as another example, the exhaust through holes 30 may be arranged in an ordered arrangement or in a disordered arrangement, according to a specific example of the invention.
According to the embodiment of the present invention, the total area of the orthographic projection of the exhaust through hole 30 on the projection plane may be not more than 50% of the area of the projection plane, for example, may be 45%, 40%, 35%, 30%, 25%, 20%, 15%, 10% or 5% of the area of the projection plane, and the inventor finds that if the total area of the orthographic projection of the exhaust through hole on the projection plane is too large, the overall strength of the current collector may be significantly reduced although the pressure relief channel may be further increased. Further, the total area of orthographic projection of the exhaust through hole 30 on the projection surface can be 10-40% of the area of the projection surface, for example, 15-40% or 25-35% of the area of the projection surface, so that the problem that timely pressure relief is affected due to too small setting area of the pressure relief through hole can be avoided, the pressure relief channel can be further increased on the basis of ensuring the integral strength of the current collector, timely pressure relief is ensured, and the safety of a battery is ensured.
According to an embodiment of the present invention, referring to fig. 1 and 2, it is understood that the body part 40 may be in a circular flat plate shape, the current collector 100 may include a plurality of first protrusions 11 and a plurality of second protrusions 21, and the plurality of first protrusions 11 and the plurality of second protrusions 21 are alternately arranged along the circumferential direction of the body part 40 at intervals, and at this time, the exhaust through hole 30 may include a first sub exhaust through hole 31 and a plurality of second sub exhaust through holes 32, the first sub exhaust through hole 31 and the body part may be concentrically arranged, and the plurality of first protrusions 11 may be arranged around the first sub exhaust through hole 31 at intervals along the circumferential direction of the body part, so that a middle pressure release channel may be further increased on the basis of having a pressure release channel in the circumferential edge region of the current collector, thereby being more advantageous for more rapidly guiding out gas when the battery cell is out of control, ensuring timely pressure release, and improving the safety and reliability of the battery.
According to the embodiment of the present invention, as will be understood with reference to fig. 1 and 2, the plurality of second sub-exhaust through holes 32 may be distributed at intervals in an area surrounded by the plurality of first protrusions 11 and the plurality of second protrusions 21, so that a pressure release channel may be further increased, timely pressure release of the battery core may be ensured, and safety and reliability of the battery may be improved. Further, the plurality of second sub-exhaust through holes 32 may be arranged in a ring in the circumferential direction of the main body portion or may be arranged in a row in the radial direction of the main body portion as long as the pressure release passage of the current collector can be increased and the overall strength of the current collector can be ensured. Preferably, the plurality of second sub-exhaust through holes 32 may be simultaneously arranged in a ring in the circumferential direction of the main body portion and in a row in the radial direction of the main body portion, whereby the uniformity and timeliness of the pressure release passage from inside to outside may be further improved.
It can be understood that the current collector can be either a positive current collector or a negative current collector, and can be flexibly selected according to actual needs, for example, when the current collector is made of aluminum, the current collector can be used as a positive current collector to be welded with an aluminum cover plate.
In yet another aspect of the invention, a battery is provided. As understood with reference to fig. 3, according to an embodiment of the present invention, the battery includes: a housing 200; a bare cell (not shown) housed in the case 200; and the current collector 100 described above, the at least one first protrusion 11 is connected to the bare cell, and the at least one second protrusion 21 is connected to the case 200. Further, the housing 200 may further have an opening 210 and a cover 220 for closing the opening, in which case the at least one second protrusion 21 may be connected with the cover 220; further, when the cap plate 220 is provided with a post, at least one second protrusion 21 may be connected to the post. It should be noted that the features and effects described for the current collector described above are equally applicable to the battery, and are not described herein. In general, the battery is simpler in structure, high in preparation efficiency and good in operability, and the pressure release channel is large, so that the pressure can be released in time during thermal runaway, and the safety is higher. In addition, the type of the battery is not particularly limited, and those skilled in the art can flexibly select the battery according to actual needs, for example, a cylindrical battery, etc.
In yet another aspect of the invention, a battery pack is provided. According to an embodiment of the invention, the battery pack comprises the battery described above or the current collector described above. It should be noted that the features and effects described above for the battery and the current collector are equally applicable to the battery pack, and are not described herein. Overall, the battery pack is more safe. It will be appreciated that the battery pack may comprise one or more battery modules, each of which may comprise a plurality of batteries, at least one of which may be a battery or comprise a current collector as described above, and that the battery pack is not only safer and more reliable, but also more energy efficient than the prior art.
In yet another aspect, the present invention provides a powered device comprising a battery pack as described above or a battery as described above. It should be noted that the features and effects described with respect to the battery pack and the battery are equally applicable to the electric device, and are not described herein. Overall, the safety and reliability of the powered device are better. In addition, it should be noted that the specific type of the electric equipment is not particularly limited, and those skilled in the art can flexibly select according to actual needs, for example, the electric equipment can be a vehicle, an electronic device, a household appliance, or the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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 present invention. In this specification, schematic representations of the above terms are not necessarily directed 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, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (17)
1. A current collector, comprising:
a main body portion having a first face and a second face disposed opposite each other;
the first bulges are arranged on the first surface and are suitable for being connected with electrode lugs, and a pressure release channel is formed between the current collector and the winding core;
a plurality of second bulges, a plurality of second bulges are arranged on the second surface, a plurality of first bulges and a plurality of second bulges are alternately arranged along the circumferential direction of the main body part at intervals, the second bulges are suitable for being connected with a battery cover plate and form a pressure release channel between the current collector and the battery cover plate,
the area corresponding to the second protrusion on the first surface is provided with a step surface, the area corresponding to the first protrusion on the second surface is provided with a groove, and the ratio of the thickness between the groove bottom of the groove and the surface, deviating from the second surface, of the first protrusion to the thickness of the main body part is (0.375-0.625): 1.
2. the current collector of claim 1, wherein the body portion is in the form of a circular flat plate.
3. The current collector of claim 2, wherein the first and second protrusions each extend from a circumferential edge of the body portion toward a central region of the body portion, and wherein the second protrusions have a length of extension in a radial direction of the body portion that is less than a length of extension of the first protrusions in a radial direction of the body portion.
4. The current collector of claim 3, wherein said plurality of first protrusions are uniformly spaced apart along a circumferential direction of said body portion, said plurality of second protrusions are uniformly spaced apart along a circumferential direction of said body portion, and each of said second protrusions is equidistant from two of said first protrusions adjacent thereto.
5. The current collector of claim 1, wherein at least one of the following conditions is satisfied:
the height of the first bulge is 0.1-0.3 mm;
the protrusion height of the second protrusion is not more than 50% of the thickness of the main body part;
the extension length of each second protrusion in the radial direction of the main body is not more than 30% of the diameter of the main body;
the height of the second bulge is 10-50% of the thickness of the main body part;
the height of the second bulge is 0.1-0.6 mm;
the width direction of the first protrusions is perpendicular to the radial direction of the main body part, and the ratio of the width of each first protrusion to the diameter of the main body part is not less than 1:8.6;
the width direction of the first protrusions is perpendicular to the radial direction of the main body part, and the width of each first protrusion is not smaller than 5mm;
the ratio of the minimum distance between the centers of the first protrusions and the main body to the diameter of the main body is not more than 3:8.6;
the minimum distance between each first bulge and the circle center of the main body part is not more than 15mm;
the second protrusions are arc-shaped protrusions extending from the circumferential edge of the main body portion to the central area of the main body portion, and the angle of each second protrusion in the circumferential direction of the main body portion is not less than 60 degrees;
the second protrusions are arc-shaped protrusions extending from a circumferential edge of the main body portion toward a central region of the main body portion, and a total angle of the plurality of second protrusions in the circumferential direction of the main body portion is not less than 180 degrees.
6. The current collector of claim 1, wherein a thickness between the step face to a surface of the second protrusion facing away from the first face is no greater than a thickness of the body portion.
7. The current collector of claim 2, wherein each of said second protrusions has an extension in a radial direction of said body portion of 7.5 to 20% of a diameter of said body portion.
8. The current collector of claim 1, comprising three of said first protrusions and three of said second protrusions.
9. The current collector of claim 1, wherein the region of the body portion where the first and second protrusions are not disposed is provided with at least one exhaust through hole.
10. The manifold of claim 9, wherein the first face is a projection face, and wherein the total area of orthographic projections of the exhaust through holes on the projection face is not more than 50% of the area of the projection face.
11. The manifold of claim 10, wherein the total area of orthographic projections of the exhaust through holes on the projection surface is 10-40% of the projection surface area.
12. The current collector of claim 9, wherein the current collector comprises,
the main body part is in a circular flat plate shape,
the current collector includes a plurality of the first protrusions and a plurality of the second protrusions alternately arranged at intervals along a circumferential direction of the body portion,
the at least one exhaust through hole comprises a first sub exhaust through hole and a plurality of second sub exhaust through holes, the first sub exhaust through holes and the main body part are arranged in a concentric manner, and the first protrusions are arranged around the first sub exhaust through holes at intervals along the circumferential direction of the main body part.
13. The current collector of claim 12 wherein a plurality of said second sub-exhaust through holes are spaced apart in a region defined by a plurality of said first protrusions and a plurality of said second protrusions.
14. The current collector of claim 13, wherein at least one of the following conditions is met:
a plurality of the second sub-exhaust through holes are annularly arranged in the circumferential direction of the main body portion;
the plurality of second sub-exhaust through holes are arranged in a row in a radial direction of the main body portion.
15. A battery, comprising:
a housing;
a bare cell housed within the housing; and
the current collector of any of claims 1-14, at least one of the first protrusions being connected to the bare cell and at least one of the second protrusions being connected to the housing.
16. A battery pack comprising the battery of claim 15 or the current collector of any one of claims 1-14.
17. A powered device comprising the battery pack of claim 16 or the battery of claim 15.
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| CN202211153556.5A CN115377623B (en) | 2022-09-21 | 2022-09-21 | Current collector, battery pack and electric equipment |
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| CN202211153556.5A CN115377623B (en) | 2022-09-21 | 2022-09-21 | Current collector, battery pack and electric equipment |
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| CN115377623B true CN115377623B (en) | 2023-10-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116154183A (en) * | 2023-03-30 | 2023-05-23 | 厦门海辰储能科技股份有限公司 | Current collecting assembly, energy storage device and electric equipment |
| CN220021522U (en) * | 2023-04-14 | 2023-11-14 | 比亚迪股份有限公司 | Pole core assembly, battery cell, battery pack and electricity utilization device |
| CN116646658B (en) * | 2023-07-27 | 2024-01-23 | 深圳海辰储能控制技术有限公司 | Energy storage device and electric equipment |
| CN117855565B (en) * | 2024-03-05 | 2024-05-03 | 厦门海辰储能科技股份有限公司 | Energy storage device and electric equipment |
| CN118589155A (en) * | 2024-08-02 | 2024-09-03 | 比亚迪股份有限公司 | Battery end cover assembly, battery and electric equipment |
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