CN117239357B - Flexible electric connecting piece, battery row and battery pack - Google Patents
Flexible electric connecting piece, battery row and battery pack Download PDFInfo
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- CN117239357B CN117239357B CN202311490764.9A CN202311490764A CN117239357B CN 117239357 B CN117239357 B CN 117239357B CN 202311490764 A CN202311490764 A CN 202311490764A CN 117239357 B CN117239357 B CN 117239357B
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- 238000003466 welding Methods 0.000 claims description 20
- 239000004020 conductor Substances 0.000 claims description 16
- 239000003292 glue Substances 0.000 claims description 12
- 238000002788 crimping Methods 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 4
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- 239000013013 elastic material Substances 0.000 claims description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 4
- 238000009954 braiding Methods 0.000 claims description 3
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- 230000004907 flux Effects 0.000 description 7
- 230000003139 buffering effect Effects 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 230000000875 corresponding effect Effects 0.000 description 3
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- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
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- 238000006073 displacement reaction Methods 0.000 description 2
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- 229910052759 nickel Inorganic materials 0.000 description 2
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Classifications
-
- 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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- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention relates to a flexible electric connecting piece, a battery row and a battery pack, wherein the flexible electric connecting piece can realize stable electric connection and structural connection between two adjacent single cylindrical batteries, and the flexible connecting piece is respectively arranged between a plurality of adjacent single cylindrical batteries, so that the battery row and the battery pack with stable electric connection and structural connection can be formed. The flexible electric connecting piece comprises a first connecting part, a second connecting part and a bridge body part, wherein the first connecting part and the second connecting part can be respectively and electrically connected/fixedly connected with a polar pole of a cylindrical battery or the electric connecting piece above the polar pole, the bridge body part is a flexible piece and is positioned between the first connecting part and the second connecting part, at least one arc surface section exists in the structure, the problem of larger rigidity of a bus bar in the prior art can be solved, and the stress of two adjacent cylindrical batteries under the vibration condition can be reduced.
Description
Technical Field
The invention relates to the field of new energy power batteries, in particular to a flexible electric connecting piece, a battery row and a battery pack.
Background
In the process of serial-parallel connection of cylindrical batteries, the serial-parallel connection and the structural connection of the cylindrical batteries are realized through an electric connector and a structural connector arranged between the batteries, so that the cylindrical batteries are connected in series-parallel to form a battery pack for group application, and an important reliability index is the reliability of continuous connection of an electric connection point and the stability of electric flux under a vibration environment. As the capacity of cylindrical batteries has grown, so too has the electrical flux at the electrical connection points on the cylindrical battery poles and the overcurrent requirements of the electrical connections (particularly the series bus bars) electrically connected thereto.
The series bus bar is generally electrically connected to the poles of different polarities of the adjacent cylindrical batteries, and its overcurrent capacity is positively correlated with its sectional area, thus possibly resulting in a thickening of the bus bar; the electrical connection between the bus bar and the battery post requires a larger contact area and higher connection strength to ensure higher electric flux of the electrical connection point and reduce the influence of stress, pushing force and stripping force transmitted by the bus bar in a vibration state on the reliability and stability of the electrical connection point.
The prior art generally adopts a method for strengthening the structural strength of the electric connection point and limiting the displacement amplitude between the batteries so as to reduce the influence of vibration stress on the stability of the electric connection point. The specific method is that metal sheets with the same width and the same height, such as aluminum sheets, copper sheets, nickel sheets and other strip-shaped metals are adopted as bus bars, and two ends of the bus bars are respectively and electrically connected to the pole posts of different cylindrical batteries. Because of the high overcurrent capacity, the buss bars with the integrated structure are generally high in rigidity, the external force required by expansion and contraction is high, and stress generated by the anisotropic movement between batteries under the vibration condition is directly reflected on the electric connection points at the two ends through the conduction of the rigid buss bars, and the impact is continuously generated on the connection strength, so that the electric connection points are possibly separated or loose (electric flux change); in order to reduce the threat, the prior art adopts the structure that the mounting bracket is sleeved between the batteries to carry out displacement limiting, meanwhile, structural adhesive is fully filled between the batteries, so that the vibration amplitude caused by the fit clearance of the batteries is further reduced, the stress applied to the bus bar is reduced, and the influence on the reliability and the stability of the electric connection point is reduced. The full glue injection brings great weight increment to the battery pack, directly reduces the weight energy density index of the group, and is not easy to replace and maintain the cylindrical battery.
Disclosure of Invention
The invention discloses a flexible electric connecting piece, a battery row and a battery pack, which are used for solving the problems in the prior art.
In one aspect, an embodiment of the present invention provides a flexible electrical connector for electrically connecting the poles of two adjacent cylindrical batteries, wherein the flexible electrical connector includes:
the first connecting part is a strip-shaped inflexible conductor or a flexible conductor and is used for fixedly connecting/electrically connecting a polar pole of a cylindrical battery or a rigid electric connector on the polar pole;
the second connecting part is a strip-shaped inflexible conductor or a flexible conductor and is used for fixedly connecting/electrically connecting a polar pole of another cylindrical battery or a rigid electric connecting piece on the polar pole;
the first connecting part and/or the second connecting part are/is rigidly and electrically connected with a polar pole of the cylindrical battery or a rigid electric connecting piece on the pole, and the rigid electric connection has a high connection strength and stripping resistance;
the bridge body part is a flat-laid strip-shaped flexible conductor, two ends of the bridge body part are respectively connected/electrically connected between the first connecting part and the second connecting part, the first connecting part and the second connecting part are electrically communicated through the bridge body part, the bridge body part is provided with at least one buffer part, the buffer part comprises at least one telescopic section of elastic material along the flat-laid direction, and the telescopic section can be bent towards the direction perpendicular to the flat-laid direction and still has elasticity, or is provided with an arc surface section of strip-shaped inelastic material expanding along the direction perpendicular to the flat-laid direction; the buffer part has elasticity, can generate deformation easily when the external force is larger than the elasticity of the buffer part, and is used for providing interval difference length redundancy and height difference redundancy along the tiling direction and/or perpendicular to the tiling direction between the first connecting part and the second connecting part between the two ends of the bridge body part so as to reduce the influence of the external force on the high connection strength of the connection point A and keep the electrical connection stability of the connection point A; the buffer part has the maximum elastic deformation interval; the arc surface section can be higher than the side shell of the cylindrical batteries when the two cylindrical batteries are electrically connected through the first connecting part and the second connecting part; the elastic force of the buffer part is smaller than the high connection strength of the connection point A, and the maximum deformation distance of the elastic force is smaller than or equal to the maximum distance difference and the height difference of the two ends of the bridge body part caused by external force.
In a second aspect, an embodiment of the present invention provides a battery row, including a plurality of cylindrical batteries arranged in sequence, two adjacent cylindrical batteries are electrically connected in series, a flexible electrical connector as described above is connected between adjacent batteries, a first connection portion of the flexible electrical connector is rigidly connected/electrically connected with a housing pole of one cylindrical battery, and a second connection portion is rigidly connected/electrically connected with a top pole of another adjacent cylindrical battery.
In a third aspect, an embodiment of the present invention provides a battery pack, including a plurality of battery rows as described above, where a plurality of the battery rows are disposed in parallel or in a staggered manner;
the adjacent battery rows are electrically connected in parallel, the flexible electric connecting pieces are arranged between the adjacent cylindrical batteries in parallel, the flexible electric connecting pieces between the shell poles of the adjacent cylindrical batteries in parallel are provided with two buffer parts, the two adjacent buffer parts extend downwards longitudinally to form corresponding lap joint parts, and cold welding glue is arranged between the adjacent lap joint parts.
Compared with the prior art, the invention has the following beneficial effects:
the invention mainly provides a flexible electric connecting piece, a battery row and a battery pack, wherein the flexible electric connecting piece can realize stable electric connection and structural connection between two adjacent single cylindrical batteries, the flexible connecting piece is respectively arranged between a plurality of adjacent single cylindrical batteries, and the battery row and the battery pack which are stable in electric connection and structural connection can be formed.
The flexible electric connecting piece comprises a first connecting part, a second connecting part and a bridge body part, wherein the first connecting part and the second connecting part can be respectively and electrically connected with a polar pole of a cylindrical battery or an electric connecting piece above the polar pole of the cylindrical battery or the electric connecting piece is in rigid electric connection, the bridge body part is a flexible piece and is positioned between the first connecting part and the second connecting part, at least one arc surface section exists in the structure, the problem that the rigidity of a bus bar is high in the prior art can be solved, and the stress of two adjacent cylindrical batteries under the vibration condition is reduced.
The bridge body part is provided with at least two buffer parts, the adjacent buffer parts extend downwards longitudinally and are combined into a lap joint part, the lap joint part can be electrically connected with the side surface shell of the adjacent cylindrical battery, and the adjacent lap joint parts are also electrically connected so as to realize more stable electrical connection between the adjacent single batteries.
In a preferred embodiment of the invention, the bridge body is formed by weaving flexible conductive wires or laminating flexible conductive sheets, the first connecting part and the second connecting part can be regarded as extension sections of the bridge body, the cross section area of the flexible electric connecting piece can be adjusted according to the electric flux required by the cylindrical battery, the flexible electric connecting piece is ensured to have a flexible function, and the influence of stress, pulling force and stripping force of the flexible electric connecting piece on the reliability and stability of an electric connecting point under the vibration state of the cylindrical battery is greatly reduced.
In addition, the first connecting part and the second connecting part are fixed with the pole of the cylindrical battery through fasteners, so that reliable electric connection of the connecting points is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments are briefly described below to form a part of the present invention, and the exemplary embodiments of the present invention and the description thereof illustrate the present invention and do not constitute undue limitations of the present invention. In the drawings:
FIG. 1 is a schematic view of a flexible electrical connector according to a preferred embodiment of the invention disclosed in example 1;
FIG. 2 is a schematic view of a flexible electrical connector according to a preferred embodiment of the invention disclosed in example 1;
FIG. 3 is a view showing the state of use of the flexible electrical connector according to the preferred embodiment of the present invention disclosed in example 1;
FIG. 4 is a schematic view showing the structure of a flexible electrical connector according to a preferred embodiment of the invention disclosed in example 1;
FIG. 5 is a schematic view showing the structure of a flexible electrical connector according to a preferred embodiment of the invention disclosed in example 1;
FIG. 6 is a front view of FIG. 5;
FIG. 7 is a schematic view of the flexible electrical connector according to a preferred embodiment of the invention disclosed in example 1;
FIG. 8 is a front view of FIG. 7;
FIG. 9 is a schematic view showing the structure of a flexible electrical connector according to a preferred embodiment of the invention disclosed in example 1;
FIG. 10 is a schematic view of the flexible electrical connector according to the preferred embodiment of the invention disclosed in example 1;
FIG. 11 is a schematic view showing the structure of a flexible electrical connector according to a preferred embodiment of the invention disclosed in example 1;
fig. 12 is a schematic view showing the structure of a battery row in a preferred embodiment disclosed in example 2 of the present invention;
fig. 13 is a schematic view showing the structure of a battery row in a preferred embodiment disclosed in example 2 of the present invention.
Reference numerals illustrate:
the flexible electrical connector 100, the first connection part 110, the first extension part 111, the second connection part 120, the second extension part 122, the bridge part 130, the buffer part 131, the lap joint part 132, the cylindrical battery 200, the housing post 210, the top post 220, the fastener 300, the sheet 310, and the circular band type surrounding locking unit 320.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention and corresponding drawings. In the description of the present invention, it should be noted that the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art. In addition, in the description of the present application, the terms "first," "second," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.
The "battery", "single battery" and "cylindrical battery 200" appearing in the following examples are the same in meaning, and refer to "cylindrical battery 200" in each case.
It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to fig. 1-11, the present embodiment provides a flexible electrical connector 100 suitable for use between adjacent cells in a battery row or stack such that adjacent two cells are electrically connected in parallel or in series; the flexible electric connector 100 can simultaneously realize stable structural connection and reliable electric connection between two adjacent cylindrical batteries 200, and even if the cylindrical batteries 200 are pulled by external vibration or obvious external force, the stability of the electric connection part is not obviously affected.
Preferably, the cylindrical battery 200 to which the flexible electrical connector 100 of the present embodiment is applied may be selected from 18650 battery, 21700 battery, 46800 battery, etc., but is not limited thereto.
Preferably, the cylindrical battery 200 to which the flexible electrical connector 100 is applied in the present embodiment may be a battery with a neck portion or a battery without a neck portion.
In a preferred embodiment, the cylindrical battery 200 has a housing post 210 and a top post 220, the housing post 210 comprising a metal housing disposed at the side housing and bottom of the housing, the top post 220 disposed at the center of the top cap; it will be appreciated by those skilled in the art that the top post 220 and the housing post 210 are each two different polarity posts of the cylindrical battery 200. In view of the slight differences in shape/structure/size of the cylindrical batteries 200 of different models, this embodiment is not exemplified.
Preferably, the flexible electrical connector 100 includes a first connecting portion 110, a second connecting portion 120 and a bridge portion 130, where the first connecting portion 110 and the second connecting portion 120 can be respectively and rigidly connected to a polar post of one cylindrical battery 200 or a rigid electrical connector on the polar post, the bridge portion 130 is disposed between the first connecting portion 110 and the second connecting portion 120, and is preferably formed by integrally forming a conductor, and the bridge portion 130 is of a flexible structure, so that stress generated by different movement between two cylindrical batteries 200 can be reduced when the two cylindrical batteries 200 vibrate, impact force of connection points between the first connecting portion 110 and the cylindrical batteries 200 and between the second connecting portion 120 and the cylindrical batteries 200 can be avoided, stability of electrical connection between the first connecting portion 110 and/or the second connecting portion 120 and the cylindrical batteries 200 can be improved, and variation of electrical flux between two adjacent cylindrical batteries 200 can be avoided.
In a preferred embodiment, the first connection part 110 and the second connection part 120 are both strip-shaped non-flexible conductors or flexible conductors, wherein the first connection part 110 is used for fixedly/electrically connecting a polar pole of one cylindrical battery 200 or a rigid electrical connector on the polar pole, and the second connection part 120 is used for fixedly/electrically connecting a polar pole of another cylindrical battery 200 or a rigid electrical connector on the polar pole, and preferably, the first connection part 110 and the second connection part 120 have connection point anti-stripping force at the electrical connection part with the cylindrical battery 200.
Preferably, the first connection portion 110 and the second connection portion 120 can be connected to the same polarity of the poles, as shown in fig. 1, and can also be connected to different polarities of the poles, as shown in fig. 2 and 3, and it should be understood by those skilled in the art that when the first connection portion 110 and the second connection portion 120 are respectively connected to the same polarity of the poles of the two batteries, the two batteries are electrically connected in parallel, and when the first connection portion 110 and the second connection portion 120 are respectively connected to the different polarities of the poles of the two batteries, the two batteries are electrically connected in series.
Preferably, when the first connection part 110 or the second connection part 120 is connected to the top post 220 of a certain battery, the top post 220 may be further provided with the above-mentioned rigid electrical connection member, and in particular, the rigid electrical connection member is a conductive sheet, so that the rigid electrical connection member can be reliably and electrically connected to the top post 220 of the cylindrical battery 200.
In a preferred embodiment, the first connection part 110 and/or the second connection part 120 are fixedly and reliably electrically connected to the top post 220 of the cylindrical battery 200 or the rigid electrical connection on the top post 220 by means of metal deep-melt welding.
Preferably, the first connection part 110 and the second connection part 120 are each configured in a flat shape; preferably, the cross-sectional area of the first connection portion 110 and/or the second connection portion 120 is equal to the cross-sectional area of the bridge portion 130, and the width of the first connection portion 110 and/or the second connection portion 120 is greater than the width of the bridge portion 130, as shown in fig. 4, so as to ensure that the first connection portion 110, the second connection portion 120 and the bridge portion 130 can all bear the same current.
In a preferred embodiment, the bridge portion 130 is configured as a strip-shaped flexible conductor, as shown in fig. 4, and the first connection portion 110 and the second connection portion 120 are electrically connected through the bridge portion 130; the bridge body 130 has at least one buffer portion 131, the buffer portion 131 is configured with at least one stretchable section of elastic material or a strip-shaped inelastic arc surface section, the buffer portion 131 has elasticity, the elasticity is smaller than the peeling resistance of the connection points of the first connection portion 110, the second connection portion 120 and the cylindrical battery 200, and when the external force is larger than the elasticity, the buffer portion 131 can deform; the arc surface section is used for providing length redundancy and height redundancy between the first connection part 110 and the second connection part 120, and more preferably, the arc surface section can be higher than a side surface shell of the cylindrical battery 200 when the two cylindrical batteries 200 are electrically connected through the first connection part 110 and the second connection part 120, so that after the first connection part 110 and the second connection part 120 are respectively fixed with the two cylindrical batteries 200, the cylindrical battery 200 can overcome stress, pulling force and stripping force between the adjacent two cylindrical batteries 200 through the flexible action of the flexible electric connector 100 and the bridge body 130 under the vibration state, and the connection stability of the first connection part 110 and the second connection part 120 with the cylindrical batteries 200 is ensured.
In the prior art, if the batteries are connected based on the rigid bus bar, adjacent batteries have a trend of being far away from each other in a vibration state or when being pulled, and the electric connection points may be separated or loose; when the adjacent cylindrical batteries 200 are electrically and structurally connected by the flexible electrical connector 100 in the present embodiment, the arc surface section on the buffer portion 131 will be changed from the arc bending state to the straightening state when vibration or pushing occurs, so as to provide buffering for vibration between the two batteries, and avoid loosening the first connection portion 110, the second connection portion 120 and the cylindrical batteries 200, or breaking itself; specifically, since the arc surface section itself can provide buffering, the arc surface section is not limited in radian, length and height in this embodiment.
In a preferred embodiment, at least one arc extension section having an external shape matching the side housing of the adjacent cylindrical battery 200 is further provided at both sides of the buffer portion 131, capable of being pressure-connected with the housing post 210 of the adjacent cylindrical battery 200, and capable of being lower than the top of the side housing of the cylindrical battery 200 when the two cylindrical batteries 200 are electrically connected through the first and second connection portions 110 and 120; when two adjacent cylindrical batteries 200 are vibrated to be mutually extruded, the arc extension sections can be abutted against the adjacent side surface shells to realize further electric connection, when two adjacent cylindrical batteries 200 are vibrated to be mutually separated, the arc extension sections can be further separated from the adjacent side surface shells when the arc surface sections are stretched to the extreme value, so that further buffering is provided, and the buffer parts 131 are prevented from being broken or the electric contacts of the first connecting parts 110, the second connecting parts 120 and the batteries are prevented from being loosened.
In this embodiment, the length of the arc extension section is not limited, but the cross-sectional shape and the size thereof are the same as those of the configuration of the arc surface section, and can be regarded as the downward extension of both ends of the arc surface section.
In a preferred embodiment, at least two buffer parts 131 are provided on the bridge 130, as shown in fig. 7-9, each buffer part 131 is provided with an arc surface section, adjacent buffer parts 131 extend downwards longitudinally and are combined to form a lap part 132, the adjacent lap parts 132 are electrically connected, and the lap part 132 can be lower than the top of the side shell of the cylindrical battery 200 when the two cylindrical batteries 200 are electrically connected through the first connecting part 110 and the second connecting part 120, so as to realize transverse lap electrical connection with the side shell, which is beneficial to CTC in the box.
Preferably, when the bridge body 130 is provided with at least two buffering portions 131, the two ends of the arc surface section of each buffering portion 131 are further provided with arc extension sections, and the overlap portion 132 is formed by combining two adjacent arc extension sections, and optionally, the two adjacent arc extension sections are fixedly connected or integrally formed.
In a preferred embodiment, two adjacent cushioning portions 131 extend horizontally and laterally to form an adjacent overlapping region that forms a lap portion 132, with adjacent lap portions 132 being electrically connected, or with adjacent side housings, lap portions 132 being electrically connected.
In another preferred embodiment, adjacent cushioning portions 131 are integrally bent and formed, and both extend downwardly and are inverted in a U-shape, with the sections forming overlapping portions 132.
In a preferred embodiment, the bridge 130 is provided with two buffer portions 131, the arc surface sections of each buffer portion 131 have the same size, the two buffer portions 131 extend downwards to form a lap joint portion 132, two sides of the lap joint portion 132 are respectively and tightly electrically connected with the side shells of the cylindrical batteries 200 on two sides, and when the two buffer portions 131 are provided, no matter which of the two adjacent batteries has a trend of being far away from the other battery when vibrating, the two buffer portions 131 can provide buffer in two different directions so as to ensure the stability of electrical connection and structural connection.
In a preferred embodiment, the overlapping portion 132 is formed by extending downward adjacent arc extending sections, and the length of the overlapping portion 132 does not exceed the height of the housing of the cylindrical battery 200, that is, the length of the overlapping portion 132 is not greater than the height of the side housing, and in this embodiment, the length of the overlapping portion 132 is not particularly limited. Those skilled in the art will appreciate that the longer the length of the overlap 132, the greater its overlap area with the side housing of the two-sided battery, the more stable the structure.
Optionally, since two adjacent batteries can be electrically connected in series or in parallel as required, the adjacent lap joint portion 132 or the lap joint portion 132 and the adjacent side surface shell are provided with cold welding glue, and the adjacent batteries are electrically connected in parallel at this time; alternatively, adjacent lap joints 132 or cold welding glue and structural connectors are provided between the lap joints 132 and the adjacent side shells, at which time adjacent cells are electrically connected in series.
Preferably, as shown in fig. 4 or fig. 9, between the first connection portion 110 and the bridge portion 130, a first extension portion 111 is provided, and the first extension portion 111 is disposed in parallel with the first connection portion 110 or vertically bent; preferably, between the second connection portion 120 and the bridge portion 130, a second extension portion 121 is provided, and the second extension portion 121 is disposed in parallel with the second connection portion 120 or vertically bent.
In a preferred embodiment, when the first connection portion 110 is connected to the top post 220 of the battery or the rigid electrical connection on the top post 220, the first extension portion 111 extends parallel to the first connection portion 110, both being in the same plane and integrally formed; when the first connection portion 110 is electrically connected to the battery case post 210, the first extension portion 111 is vertically bent with respect to the first connection portion 110.
Similarly, when the second connection portion 120 is connected to the top post 220 of the battery or the rigid electrical connection member on the top post 220, the second extension portion 121 extends parallel to the second connection portion 120, and is in the same plane and integrally formed; when the second connection portion 120 is electrically connected to the battery case post 210, the second extension portion 121 is vertically bent with respect to the second connection portion 120.
In particular, when the first extension 111 or the second extension 121 is connected to the housing post 210 of the cylindrical battery 200, the first extension 111 can increase the electrical connection area between the first connection portion 110 and the housing post 210, and the second extension 121 can also increase the electrical connection area between the second connection portion 120 and the housing post 210.
Referring to fig. 4, in a preferred embodiment, the bridge portion 130 is formed by separately laminating and curing a plurality of flexible conductive sheets.
In a preferred embodiment, the first connection portion 110 and/or the second connection portion 120 are formed by welding and hardening a plurality of flexible conductive sheets extending outward from both ends of the bridge portion 130.
In another preferred embodiment, the first connection portion 110 and/or the second connection portion 120 are formed by fixedly connecting and hardening a plurality of flexible conductive sheets extending outward from both ends of the bridge portion 130 with each other by using a conductive adhesive. Preferably, when the flexible electrical connector 100 is further provided with the first extension portion 111 and/or the second extension portion 121, the first extension portion 111 and the second extension portion 121 are formed by welding and hardening a plurality of flexible conductive sheets extending outward from both ends of the bridge portion 130, or the first extension portion 111 and the second extension portion 121 are formed by fixedly hardening a plurality of flexible conductive sheets extending outward from both ends of the bridge portion 130 by using a conductive adhesive.
Specifically, each of the stacked flexible conductive sheets has a flexible function, so that the bridge body 130 formed by stacking a plurality of flexible conductive sheets is ensured to have a flexible function at each part of each layer, and when the first connection part 110 and the second connection part 120 are respectively and reliably electrically connected with the corresponding two cylindrical batteries 200, the bridge body 130 is positioned between the adjacent two cylindrical batteries 200, and the stress, the pushing force and the stripping force applied to the cylindrical batteries 200 during vibration are overcome through the flexible function.
Referring to fig. 5 and 6, in a preferred embodiment, the bridge portion 130 is formed by bundling or cross-braiding a plurality of flexible conductive wires in parallel, alternatively, the flexible conductive wires may be made of a metallic material, such as copper, aluminum, nickel, etc., or the flexible conductive wires may be non-metallic conductive wires, such as carbon fiber wires.
Preferably, the first connection portion 110 and/or the second connection portion 120 are formed by extending the bridge portion 130 to the outside of both ends, and the first connection portion 110 and/or the second connection portion 120 are identical to or different from the bridge portion 130.
In a preferred embodiment, the first connection part 110 and/or the second connection part 120 is formed by welding and hardening a plurality of flexible conductive wires extending to the outside of both ends of the bridge body 130 in parallel together or in a cross-woven tape, and optionally, the first connection part 110 and/or the second connection part 120 is electrically connected with the top post 220 of the cylindrical battery 200 or a rigid electrical connection member on the top post 220 by cold welding glue crimping.
In another preferred embodiment, the first connection portion 110 and/or the second connection portion 120 are formed by fixedly connecting and hardening a plurality of flexible conductive wires extending to the outer sides of two ends of the bridge body portion 130 in parallel together or by using an adhesive, and optionally, the adhesive is conductive adhesive or structural adhesive; optionally, the first connection part 110 and/or the second connection part 120 are electrically connected with the top post 220 of the cylindrical battery 200 or a rigid electrical connection on the top post 220 by cold welding glue crimping.
In another preferred embodiment, the first connection part 110 and/or the second connection part 120 is formed by welding and hardening between a conductive sheet and a plurality of flexible conductive wires in parallel in bundles or cross-woven tapes, and optionally, the first connection part 110 and/or the second connection part 120 is electrically connected with the top post 220 of the cylindrical battery 200 or a rigid electrical connection on the top post 220 by cold welding glue crimping.
In another preferred embodiment, the first connection part 110 and/or the second connection part 120 are formed by fixing and hardening conductive adhesive and/or structural adhesive between a conductive sheet and a plurality of flexible conductive wires in parallel in bundles or in a cross-woven tape, optionally, the adhesive is conductive adhesive or structural adhesive, optionally, the first connection part 110 and/or the second connection part 120 is electrically connected with the top pole 220 or a rigid electrical connection piece on the top pole 220 of the cylindrical battery 200 by cold welding adhesive crimping.
Preferably, no matter the bridge 130 is made of flexible conductive sheets or flexible conductive wires, the plurality of flexible conductive sheets/flexible conductive wires can be arranged independently of each other in the bridge 130, and are not connected or electrically connected in the bridge 130, and are concentrated in the first connecting portion 110 or the second connecting portion 120, then are electrically connected to each other, and are electrically connected to the same polar post through conductive adhesive, at this time, the first connecting portion 110 and the second connecting portion 120 are flexibly connected to the battery.
Preferably, whether the bridge 130 is made of flexible conductive sheets or flexible conductive wires, at least one side of the bridge 130 is further covered with a flexible insulating film to provide stretch resistance of the bridge 130 and avoid breakage due to excessive stretching amplitude.
In a preferred embodiment, the first connection part 110 and/or the second connection part 120 are pressed and electrically connected with the housing post 210 of the cylindrical battery 200 or the rigid electrical connection member on the housing post 210 by the pressing of the fastener 300, so as to ensure that the first connection part 110 and the second connection part 120 have greater stability when electrically connected with the housing post 210 of the cylindrical battery 200.
In a preferred embodiment, the first connection part 110 is electrically connected to the housing post 210 of the cylindrical battery 200 with cold welding paste therebetween to improve the connection strength and stability of the electrical connection, and the fastener 300 is configured as a circular band type surrounding locking unit 320, and the first connection part 110 and/or the second connection part 120 are fixedly connected to the housing post 210 of the cylindrical battery 200 through the circular band type surrounding locking unit 320.
As shown in fig. 10, the round band type surrounding locking unit 320 is preferably an insulated wire body or lead wire surrounding the case post 210 for pressure-bonding the first and second connection parts 110 and 120 to the case post 210 of the cylindrical battery 200 to improve the peel resistance of the first and second connection parts 110 and 120 to the side case of the cylindrical battery 200.
Preferably, the first connection part 110/the second connection part 120 has an arc surface adapted to the side housing to increase the contact area with the side housing, and the circular band type surrounding the locking unit 320 is tightened thereto, so that the stability of the structural connection and the electrical connection can be further ensured.
Preferably, in order to avoid bending of the first connection part 110 and the second connection part 120 in the vertical direction after being connected with the side surface shell, a hard fixing piece is further arranged between the first connection part 110/the second connection part 120 and the circular hoop type surrounding locking unit 320, structural adhesive is arranged between the hard fixing piece and the first connection part 110 and between the hard fixing piece and the second connection part 120, and meanwhile, the inner wall of the hard fixing piece is attached to the side surface shell of the cylindrical battery 200 along an arc shape so as to improve connection reliability between the first connection part 110/the second connection part 120 and the side surface shell of the cylindrical battery 200.
In a preferred embodiment, as shown in fig. 11, the fastener 300 is configured as a plate 310 structure, and further includes a bolt and a nut at both ends of the plate 310, respectively, by which the plate 310 is fastened to the housing pole 210.
In a preferred embodiment, the first connection part 110 is electrically connected with the housing post 210 of one cylindrical battery 200, the second connection part 120 is electrically connected with the top post 220 of another cylindrical battery 200, the top post 220 is also fixedly connected with a rigid electrical connection member, the fastener 300 is configured as a rivet, the second connection part 120 is in a sheet-shaped conductor structure, and the second connection part 120 is fixedly connected with the conductive sheet through the rivet; by means of the rivet, the second connection 120 can be reliably electrically connected with the rigid electrical connection, thereby further achieving a reliable electrical connection of the second connection 120 with the top post 220.
Example 2
Referring to fig. 12 and 13, the present embodiment provides a battery pack including a plurality of cylindrical batteries 200 and a flexible electrical connector 100, wherein the technical features of the flexible electrical connector 100 already included in embodiment 1 described above are naturally inherited in the present embodiment.
In this embodiment, the battery row includes a plurality of cylindrical batteries 200 arranged in a sequential manner in the same direction, each of which has the same specification/size, and the flexible electrical connector 100 in the above embodiment is connected between two adjacent cylindrical batteries 200.
In a preferred embodiment, the first connection part 110 and the second connection part 120 of the flexible electrical connector 100 are electrically connected to the housing poles 210 of two adjacent cylindrical batteries 200, respectively, to form a parallel battery row.
In a preferred embodiment, the flexible electrical connectors 100 of two adjacent cylindrical batteries 200 have a first connection portion 110 connected to the housing post 210 of the cylindrical battery 200, and a second connection portion 120 electrically connected to the top post 220 of another adjacent cylindrical battery 200, respectively, while the connection directions of the flexible electrical connectors 100 are the same, forming a series battery row.
The battery row formed by connecting the flexible electric connection pieces 100 in series or in parallel can overcome the pulling stress and the peeling force between the two adjacent cylindrical batteries 200 by the flexible electric connection pieces 100 when the battery row is in a vibration state, so that the reliability and the stability of the connection between the first connection part 110 and the second connection part 120 and the cylindrical batteries 200 are ensured.
Example 3
The present embodiment provides a battery pack including a plurality of battery rows, wherein the technical features already included in the above-described embodiment 1 or 2 regarding the flexible electrical connector 100/battery rows are naturally inherited in the present embodiment.
In a preferred embodiment, a plurality of battery rows are arranged in a parallel array with adjacent battery rows electrically connected to form a battery pack.
In another preferred embodiment, a plurality of battery rows are arranged in a staggered manner, and adjacent battery rows are electrically connected to form another battery pack in a tight arrangement, and at this time, when the battery pack is in a vibrating state, the flexible electrical connector 100 can overcome the pulling stress and the peeling force between two adjacent cylindrical batteries 200, so that the reliability of the connection between the first connection part 110 and the second connection part 120 and the cylindrical batteries 200 is ensured, and the reliable and stable electric flux of the battery pack is ensured.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are to be protected by the present invention.
Claims (24)
1. A flexible electrical connector for electrically connecting the poles of two adjacent cylindrical batteries, the flexible electrical connector comprising:
the first connecting part is a strip-shaped inflexible conductor or a flexible conductor and is used for fixedly connecting/electrically connecting a shell pole of a cylindrical battery or a rigid electric connector on the shell pole;
the second connecting part is a strip-shaped inflexible conductor or a flexible conductor and is used for fixedly connecting/electrically connecting a polar pole of another cylindrical battery or a rigid electric connecting piece on the polar pole;
the first connecting part and/or the second connecting part are/is rigidly and electrically connected with a polar pole of the cylindrical battery or a rigid electric connecting piece on the pole, and the rigid electric connection is provided with a connecting point A with high connection strength;
the bridge body part is a flat-laid sheet-shaped flexible conductor, two ends of the bridge body part are respectively connected with/electrically connected with the first connecting part and the second connecting part, the first connecting part and the second connecting part are electrically conducted through the bridge body part, the bridge body part is provided with at least one buffer part, the buffer part comprises at least one telescopic section which is made of elastic materials along the flat-laid direction, and the telescopic section can be bent towards the direction vertical to the flat-laid direction and still has elasticity, or is provided with an arc surface section which is made of a sheet-shaped non-elastic material and extends along the direction vertical to the flat-laid direction; the buffer part has elasticity, can generate deformation easily when the external force is larger than the elasticity of the buffer part, and is used for providing interval difference redundancy and height difference redundancy along the tiling direction and/or perpendicular to the tiling direction for the two ends of the bridge part so as to reduce the influence of the external force on the high connection strength of the connection point A and keep the electrical connection stability of the connection point A; the buffer part has the maximum elastic deformation interval; the arc surface section can be higher than the side shell of the cylindrical batteries when the two cylindrical batteries are electrically connected through the first connecting part and the second connecting part; the elastic force of the buffer part is smaller than the high connection strength of the connection point A, and the maximum deformation distance of the elastic force is smaller than or equal to the maximum distance difference and the height difference of the two ends of the bridge body part caused by external force.
2. The flexible electrical connector of claim 1, wherein the buffer comprises at least one arcuate extension segment having a profile that mates with a side housing of an adjacent cylindrical battery for crimped electrical connection with a housing post of an adjacent cylindrical battery, the arcuate extension segment being capable of being lower than a top of a side housing of a cylindrical battery when two cylindrical batteries are electrically connected by the first and second connection portions.
3. The flexible electrical connector of claim 1, wherein the bridge portion is provided with at least two buffer portions, adjacent buffer portions extend longitudinally downward and are combined to form overlapping portions left and right, adjacent overlapping portions are electrically connected, and the overlapping portions can be lower than the top of the side housing of the cylindrical battery when the two cylindrical batteries are electrically connected through the first connecting portion and the second connecting portion.
4. A flexible electrical connector as in claim 3 wherein cold solder or a cold solder and structural connector is provided between adjacent ones of the overlapping portions.
5. The flexible electrical connector of claim 1, wherein the bridge body is provided with at least two buffer portions, adjacent buffer portions are integrally formed, corresponding sections extending downward in the middle and inverted in a U-shape, or extending horizontally in the common and inverted in an S-shape form a lap joint portion capable of expanding and contracting when two cylindrical batteries are electrically connected through the first connection portion and the second connection portion, and lower than the top of the side case of the cylindrical battery.
6. The flexible electrical connector of claim 1, wherein the bridge portion is formed from a plurality of thin conductive sheets that are separately stacked.
7. The flexible electrical connector of claim 6, wherein the first and/or second connection portions are formed by welding and hardening a plurality of flexible conductive sheets extending outward from both ends of the bridge portion;
or the first connecting part and/or the second connecting part are formed by fixedly connecting and hardening a plurality of flexible conductive sheets extending to the outer sides of two ends of the bridge body part by adopting conductive adhesives.
8. The flexible electrical connector of claim 1, wherein the bridge body is formed from a plurality of flexible conductive wires bundled in parallel or cross-woven.
9. The flexible electrical connector of claim 8, wherein the first connection section and/or the second connection section is formed by welding and hardening a plurality of flexible conductive wires extending outward from both ends of the bridge body in parallel together or in a cross-woven tape;
or the first connecting part and/or the second connecting part is formed by fixedly connecting and hardening a plurality of flexible conductive wires extending to the outer sides of two ends of the bridge body in parallel or by mutually adopting an adhesive;
or the first connecting part and/or the second connecting part is formed by welding and hardening between a conductive sheet and a plurality of flexible conductive wires in parallel bunched or crossed braiding belts;
or the first connecting part and/or the second connecting part is formed by conducting strips and a plurality of flexible conducting wires which are bundled in parallel or are crossed and woven in a belt mode through conducting glue and/or structural glue.
10. The flexible electrical connector of claim 8, wherein the flexible conductive wire comprises a metallic conductive wire;
alternatively, the flexible conductive wire is a non-metallic conductive wire, the non-metallic conductive wire comprising a carbon fiber wire.
11. The flexible electrical connector of claim 10, wherein the first connection section is formed by fixedly hardening a plurality of carbon fiber wires through conductive adhesive and/or structural adhesive;
or the conductive sheet and the carbon fiber wires are subjected to parallel bundling or cross braiding and then fixedly connected and hardened through conductive adhesive and/or structural adhesive;
the first connecting part is electrically connected with the top pole of the cylindrical battery or a rigid electric connecting piece on the top pole through cold welding glue in a crimping way.
12. The flexible electrical connector of claim 8, wherein the first and/or second connection sections are formed by the bridge portion extending outwardly from both ends.
13. The flexible electrical connector of claim 1, wherein at least one face of the bridge body is covered with a flexible insulating film.
14. The flexible electrical connector of claim 1, wherein a first extension is provided between the first connection portion and the bridge portion, the first extension extending parallel to or perpendicularly bent with respect to the first connection portion;
and a second extension part is arranged between the second connecting part and the bridge body part, and the second extension part is arranged in parallel or vertically bent relative to the second connecting part.
15. The flexible electrical connection unit of any of claims 1-14, wherein the first connection unit is fixedly and electrically connected to a top post of the cylindrical battery or a rigid electrical connection member on the top post by metal deep-melt welding.
16. The flexible electrical connector of any of claims 1-14, wherein the first connection section is crimped and electrically connected to the housing post of the cylindrical battery or the rigid electrical connector on the housing post by a fastener.
17. The flexible electrical connector of claim 16, wherein the first connector is electrically connected to a housing post of a cylindrical battery, the fastener comprises a ferrule-type surrounding locking unit, and the first connector and/or the second connector are fixedly connected to the housing post of the cylindrical battery through the ferrule-type surrounding locking unit.
18. The flexible electrical connector of claim 17, wherein cold welding glue is disposed between the first connection section and the housing post.
19. The flexible electrical connector of claim 17, wherein the first connection section has an arcuate face that mates with a side housing of a cylindrical battery;
the first connecting part and the round hoop type surrounding locking unit are provided with a hard fixing sheet therebetween, or the round hoop type surrounding locking unit is also provided with a surrounding insulating tape outside.
20. The flexible electrical connector of claim 16, wherein the first connection section is electrically connected to a housing post of a cylindrical battery, the fastener comprises a tab, the tab further comprises a bolt and a nut at each end, and the tab is fastened to the housing post by the bolt and the nut.
21. The flexible electrical connector of claim 16, wherein the first connection section is electrically connected to a housing post of one cylindrical battery, the second connection section is electrically connected to a top post of another cylindrical battery, the top post is fixedly connected to the rigid electrical connector, and the rigid electrical connector comprises a conductive tab that is reliably electrically connected to the top post; the fastener also comprises a riveting piece, the second connecting part is of a sheet-shaped conductor structure, and the second connecting part is fixedly connected with the conducting strip through the riveting piece.
22. The flexible electrical connector of claim 1, wherein the first connection section and/or the second connection section is flat;
the cross-sectional area of the first connecting portion and/or the second connecting portion is equal to the cross-sectional area of the bridge portion, and the width of the first connecting portion and/or the second connecting portion is larger than the width of the bridge portion.
23. A battery row comprising a plurality of cylindrical batteries which are arranged in sequence, wherein two adjacent cylindrical batteries are electrically connected in series, a flexible electric connecting piece as claimed in any one of claims 1-22 is connected between the adjacent batteries, a first connecting part of the flexible electric connecting piece is rigidly connected/electrically connected with a shell pole of one cylindrical battery, and a second connecting part is rigidly connected/electrically connected with a top pole of another adjacent cylindrical battery.
24. A battery pack, comprising a plurality of battery rows according to claim 23, wherein a plurality of the battery rows are arranged in parallel or in a staggered manner;
the flexible electric connecting pieces are arranged between the adjacent cylindrical batteries in parallel, the flexible electric connecting pieces between the shell poles of the adjacent cylindrical batteries in parallel are provided with two buffer parts, the two adjacent buffer parts extend downwards longitudinally to form corresponding lap joint parts, and cold welding glue is arranged between the adjacent lap joint parts.
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| CN202311490764.9A CN117239357B (en) | 2023-11-10 | 2023-11-10 | Flexible electric connecting piece, battery row and battery pack |
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| CN202311490764.9A CN117239357B (en) | 2023-11-10 | 2023-11-10 | Flexible electric connecting piece, battery row and battery pack |
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