CN114649616A - Power battery and folding connecting piece for power battery - Google Patents
Power battery and folding connecting piece for power battery Download PDFInfo
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- CN114649616A CN114649616A CN202011497010.2A CN202011497010A CN114649616A CN 114649616 A CN114649616 A CN 114649616A CN 202011497010 A CN202011497010 A CN 202011497010A CN 114649616 A CN114649616 A CN 114649616A
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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
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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Abstract
The invention discloses a power battery and a folding connecting sheet for the power battery, wherein the power battery comprises: the battery comprises a plurality of battery cores, a battery core bracket and a plurality of folding connecting sheets which are sequentially arranged along the width direction of the battery, wherein both ends of each battery core are respectively provided with an anode column and a cathode column; the end parts of the plurality of battery cells are respectively fixed on the battery cell bracket; each folding connecting sheet comprises at least two electric connecting sheets formed by folding, the at least two electric connecting sheets are distributed in a stacked mode and are connected with the electric connecting sheets of the adjacent layers, each folding connecting sheet is connected with the anode column of one battery cell and the cathode column of the adjacent battery cell at the end portion of the battery cell, and the plurality of battery cells are connected in series through the folding connecting sheets. From this, the folded connection piece can guarantee to flow cross sectional area, can improve the deformability of folded connection piece again, and when the frock of being convenient for compressed tightly, the folded connection piece can fully be out of shape in order to hug closely the utmost point cylinder, avoids appearing electric core and folded connection piece's contact failure, makes the electricity of folded connection piece to electric core connect more reliably.
Description
Technical Field
The invention relates to a power battery, in particular to a power battery and a folding connecting sheet for the power battery.
Background
The cell connecting sheet of the existing power battery is usually a single-layer connecting sheet, such as one disclosed in patent No. cn201921665141.x, which is directly stamped from an aluminum sheet. Because the surface area of connection piece is great, consequently can be with the aluminum sheet do thin in order to make the connection piece, the connection piece that finally makes like this is out of shape easily, and when the welding, welding frock compresses tightly can guarantee that the connection piece pastes tightly with the utmost point post of electric core like this, guarantees welding quality.
However, the connecting sheet is not suitable for a non-module battery pack with thin battery cells, the non-module battery pack is formed by stacking a plurality of thin battery cells, the distance between each battery cell and each battery cell is small, the length of the cross section of the connecting sheet is limited, the requirement of overcurrent capacity needs to ensure that the cross section of the connecting sheet is enough, and therefore the connecting sheet can only be thick. Because the assembly can have the error between the electric core, and utmost point post can have the clearance on length direction, if the connection piece is done thickly, partial connection piece deformability is not enough when welding frock compresses tightly, can not hug closely the utmost point post of electric core, can lead to welding badly.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. To this end, it is an object of the invention to provide a power cell and a folded tab for a power cell.
A power cell according to an embodiment of the first aspect of the invention includes: the battery comprises a plurality of battery cores, a battery core bracket and a plurality of folding connecting sheets which are sequentially arranged along the width direction of the battery, wherein both ends of each battery core are respectively provided with an anode column and a cathode column; the end parts of the plurality of battery cells are respectively fixed on the battery cell supports; each folding connecting piece comprises at least two electric connecting pieces formed by folding, the at least two electric connecting pieces are distributed in a stacked mode and are connected with one another between the electric connecting pieces of the adjacent layers, each folding connecting piece is connected with the anode column of one of the battery cells and the cathode column of the adjacent battery cell at the end portion of the battery cell, and the plurality of folding connecting pieces are used for connecting the battery cells in series.
According to the power battery provided by the embodiment of the invention, the folding connecting pieces are adopted to realize the electric connection between the adjacent battery cores, the folding connecting pieces can ensure the area of the overcurrent section and improve the deformation capacity of the folding connecting pieces, so that the folding connecting pieces can be fully deformed to be tightly attached to the pole column surface when the tool is compressed, the poor contact between the battery cores and the folding connecting pieces is avoided, and the electric connection of the folding connecting pieces to the battery cores is more reliable.
In some embodiments, the folding connecting sheet comprises a first electric connecting sheet and a second electric connecting sheet, the first electric connecting sheet is close to the end part of the battery cell, and the anode pole of one battery cell and the cathode pole of the other battery cell are respectively attached to the inner surface of the first electric connecting sheet and welded with the first electric connecting sheet.
In some embodiments, the first electrical connection sheet has two through holes for welding, the two through holes respectively correspond to the end surface of the corresponding anode pillar and the end surface of the corresponding cathode pillar, and the second electrical connection sheet has a heat dissipation hole corresponding to the through holes.
In some embodiments, the cell support has a positioning structure, and the positioning structure is used for limiting the folding connecting sheet.
In some embodiments, the positioning structure includes a first limiting rib, an outer edge of the folded connecting sheet has a limiting groove, and the first limiting rib abuts against the limiting groove in the arrangement direction of the battery cells. The positioning structure further comprises a second limiting rib, the adjacent electric connecting pieces are connected through bending parts, the bending parts are distributed along the edges of the folding connecting pieces and are arranged at intervals, a notch is formed between the adjacent bending parts, the second limiting rib extends into some embodiments in the notch between the adjacent bending parts, the positioning structure comprises a clamping hook, and the clamping hook is clamped on the surface, back to the battery core, of the folding connecting pieces in the length direction of the battery core.
In some embodiments, the cell support has a plurality of accommodating grooves distributed along the thickness direction of the cell, and the folding connecting piece is fixed by the positioning structure in the accommodating grooves.
In some embodiments, each of the holding tanks includes a first tank region, a second tank region, and a third tank region, which are sequentially distributed, an anode pillar of one of two adjacent battery cells is located in the first tank region, a cathode pillar of the other battery cell is located in the third tank region, and the second tank region is inclined from the anode pillar of the one battery cell to the cathode pillar of the other battery cell.
In some embodiments, the cell holder includes: the two transverse partition plates are opposite to each other in the length direction of the battery cell; the both ends of a plurality of vertical separators are respectively with two the cross slab is connected, and is a plurality of the vertical separators are in the thickness direction of electricity core distributes in proper order, and is a plurality of vertical separators and two cross slabs inject a plurality of holding tanks jointly, the vertical separators includes two vertical plates and connects two the hang plate of vertical plate, location structure's spacing muscle is connected perpendicularly in vertical plate.
In some embodiments, the first electrical connection tab has a gap of 0.05mm to 0.1mm from the second electrical connection tab.
In some embodiments, the power battery is a module-less battery pack.
In some embodiments, the cells are sheet-like.
In some embodiments, the cell has a length of 800mm to 1200mm, a width of 100mm to 200mm, and a thickness of 10mm to 20 mm.
The folding connecting sheet for the power battery comprises at least two electric connecting sheets formed by folding, the at least two electric connecting sheets are distributed in a laminated mode, the electric connecting sheets of adjacent layers are connected with each other, at least one electric connecting sheet is provided with two through holes used for being respectively welded with two adjacent battery cells of the power battery, and the other electric connecting sheets are provided with heat dissipation holes corresponding to the through holes.
In some embodiments, the number of the electrical connection sheets is two, and the first electrical connection sheet and the second electrical connection sheet are respectively provided, the first electrical connection sheet is connected with the second electrical connection sheet through a bending portion, the first electrical connection sheet is provided with two through holes for welding, the two through holes respectively correspond to the end surface of the corresponding anode column and the end surface of the corresponding cathode column, and the heat dissipation hole is located in the second electrical connection sheet.
In some embodiments, the electrical connection sheet has a plurality of limiting grooves, a portion of the limiting grooves separates the adjacent bending portions, and another portion of the limiting grooves is located on a side of the electrical connection sheet opposite to the bending portions.
In some embodiments, the edge of the folding connecting piece includes a first transverse edge, a first oblique edge, a first vertical edge, a second transverse edge, a second oblique edge, a second vertical edge, a third oblique edge, and a third vertical edge, which are sequentially connected end to end, the first transverse edge and the second transverse edge are disposed oppositely, the first oblique edge and the third oblique edge are disposed oppositely, the bending portion is located at the first oblique edge, and the second vertical edge is formed with the other part of the limiting groove.
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 above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic diagram of a power cell according to an embodiment of the invention.
Fig. 2 is a partial schematic view of an end of a power cell according to an embodiment of the invention.
Fig. 3 is a right-side schematic view of the power battery shown in fig. 1.
FIG. 4 is a schematic cross-sectional view taken along line A-A of FIG. 3 (only a portion shown)
Fig. 5 is a schematic diagram of a cell support of a power battery according to an embodiment of the present invention.
Figure 6 is a front view of a folded connecting piece according to an embodiment of the invention.
Fig. 7 is a schematic left side view of fig. 6.
Figure 8 is a schematic representation of a folded web according to an embodiment of the invention before bending.
Reference numerals:
the power battery 100 is provided with a power battery,
folding connecting sheet 10, electric connecting sheet 11, first electric connecting sheet 11a, through hole 111, second electric connecting sheet 11b, heat dissipation hole 112, bending part 12, limiting groove 13, first transverse edge 141, first oblique edge 142, first vertical edge 143, second transverse edge 144, second oblique edge 145, second vertical edge 146, third oblique edge 147, third vertical edge 148, gap 15,
a cell 20, an anode post 21, a cathode post 22,
the battery cell support 30, the positioning structure 31, the first limiting rib 311, the second limiting rib 312, the accommodating groove 32, the first groove area 321, the second groove area 322, the third groove area 323, the transverse partition plate 33, the longitudinal partition plate 34, the longitudinal plate 341, the inclined plate 342, and the hook 35.
Detailed Description
Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.
A power cell 100 and a folded tab 10 for the power cell 100 according to an embodiment of the invention are described below with reference to fig. 1-8.
As shown in fig. 1, a power battery 100 according to an embodiment of the first aspect of the present invention includes: the battery comprises a plurality of battery cores 20, a battery core support 30 and a plurality of folding connecting sheets 10 which are sequentially arranged along the width direction of the battery.
As shown in fig. 2, each of the battery cells 20 has an anode post 21 and a cathode post 22 at its two ends; the ends of the plurality of battery cells 20 are respectively fixed to the battery cell supports 30; each folding connecting piece 10 comprises at least two electric connecting pieces 11 formed by folding, the electric connecting pieces 11 are distributed in a stacked mode, the electric connecting pieces 11 of adjacent layers are connected with each other, each folding connecting piece 10 is connected with an anode pole 21 of one battery cell 20 and a cathode pole 22 of one adjacent battery cell 20 at the end portion of each battery cell 20, and the plurality of folding connecting pieces 10 are used for connecting a plurality of battery cells 20 in series.
It should be noted that "folding" in folding the web 10 refers to forming by bending or folding. It will be appreciated that in the embodiment shown in fig. 2, each folding tab 10 is formed by a large tab folded in the middle, the two electrical connection tabs 11 bounded by the fold line are connected by the folded region, the two electrical connection tabs 11 are attached to each other, and finally the folding tab 10 is a two-layer structure. Of course, the present invention is not limited thereto, and the number of the electrical connection pieces 11 per folding connection piece may be 2 or more.
According to the power battery 100 of the embodiment of the invention, the folding connecting sheets 10 are adopted to realize the electric connection between the adjacent battery cores 20, on one hand, because each folding connecting sheet 10 is folded to form at least two electric connecting sheets 11 which are distributed in a stacked manner, the unfolding area of the electric connecting sheets 11 is large, and thus the overcurrent cross-sectional area can be ensured; on the other hand, because the thickness of every electric connection piece 11 is all thinner, adopt at least two electric connection pieces 11 independent each other, the stack sets up, the great electric connection piece 11 of a thickness takes place the deformation more easily, consequently also improve folding connection piece 10's deformability, when the frock of being convenient for compresses tightly, folding connection piece 10 can fully warp in order to hug closely the utmost point cylinder, avoids appearing the contact failure of electric core 20 with folding connection piece 10, makes folding connection piece 10 more reliable to electric connection of electric core 20.
In the embodiment shown in fig. 3 and 6, the folding connecting piece 10 includes a first electrical connecting piece 11a and a second electrical connecting piece 11b, the first electrical connecting piece 11a is close to the end of the cell 20, and the anode column 21 of one cell 20 and the cathode column 22 of the other cell 20 are respectively attached to the inner surface of the first electrical connecting piece 11a and welded with the first electrical connecting piece 11 a.
Therefore, the folding connecting piece 10 can be formed by folding once to have two electric connecting pieces 11 which are stacked mutually, so that the produced folding connecting piece can not only be tightly attached to the pole of the battery cell 20 and improve the welding quality, but also be more convenient to produce.
Fig. 8 is a semi-finished product of the folding connecting piece 10, that is, a drawing when the folding connecting piece is not folded, and the connecting structure between the first electric connecting piece 11a and the second electric connecting piece 11b is bent, so that the first electric connecting piece 11a and the second electric connecting piece 11b are overlapped, and the folding connecting piece 10 shown in fig. 6 is obtained.
Further, as shown in fig. 6 and 8, the first electrical connection piece 11a has two through holes 111 for welding, the two through holes 111 correspond to the end surfaces of the corresponding anode posts 21 and the corresponding cathode posts 22, respectively, the second electrical connection piece 11b has heat dissipation holes 112 corresponding to the through holes 111, and the opening area of the heat dissipation holes 112 is larger than that of the through holes 111. Specifically, the heat dissipation hole 112 may be a kidney-shaped hole, and the inner diameter of the heat dissipation hole 112 is much larger than the inner diameter of the through hole 111, and the complete through hole 111 can be seen through the heat dissipation hole 112. Like this, the effect of second electric connection piece 11b is for assisting overflowing, and the heat radiating area of electric core 20 utmost point post has been increased in the design of louvre 112 on the second electric connection piece 11b, can realize the effective cooling to electric core 20 and folding connection piece 10.
In some embodiments, as shown in fig. 4 and 5, the battery cell support 30 has a positioning structure 31, and the positioning structure 31 is used for limiting the folding connecting piece 10. Therefore, the positioning structure 31 can limit the folded connecting sheet 10, not only can stably fix the folded connecting sheet 10 before the folded connecting sheet 10 is welded to the anode column 21/cathode column 22, but also can prevent the cell 20 from being misaligned when assembled with the folded connecting sheet 10.
Further, referring to fig. 3, 5 and 6, the positioning structure includes a first limiting rib 311, the outer edge of the folded connecting piece 10 has a limiting groove 13, and in the arrangement direction of the battery cells 20, the first limiting rib 311 is stopped against the limiting groove 13. Specifically, the limiting groove 13 may be a notch that forms one side edge of the folded connecting piece 10, and the first limiting rib 311 is inserted into the notch.
From this, the design of spacing groove 13 is favorable to folding connection piece 10 bending deformation, makes folding connection piece 10 can paste tight utmost point cylinder, and first spacing muscle 311, the spacing muscle 312 of second can restrict folding connection piece 10 at least and move on the thickness direction of electric core 20, and first spacing muscle 311 and the spacing groove 13 looks adaptation at the border of folding connection piece 10 to carry out spacingly to folding connection piece 10 at folding connection piece 10 outline.
Further, the positioning structure further comprises a second limiting rib 312, the adjacent electric connecting pieces 11 are connected through the bending portions 12, the bending portions 12 are distributed along the edge of the folding connecting piece 10 and are arranged at intervals, a gap 15 is formed between the adjacent bending portions 12, and the second limiting rib 312 extends into the gap 15 between the adjacent bending portions 12. Specifically, the number of the bending part 12 is at least two, and the second limiting rib 312 extends into the notch, so that the other side edge of the folding connecting piece 10 can be roughly positioned. In other words, the limiting groove 13 and the notch 15 can be referred to as a notch formed at the edge of the folded connecting piece 10.
Therefore, the notches 15 are formed between the adjacent bent portions 12, the length of the bent portions 12 is reduced, and the two electrical connection sheets 11 can be more closely attached to each other.
Optionally, referring to fig. 5, the positioning structure 31 includes hooks 35, and in the length direction of the battery cell 20, the hooks 35 are respectively clamped on the surfaces of the folding connecting sheets 10 opposite to the battery cell 20. Specifically, the number of the hooks 35 may be at least two, and the two hooks 35 respectively lock the surface of the second electrical connection piece 11b facing away from the first connection piece. From this, the trip 35 on the electric core support 30 plays the effect of fixed connection piece, can carry on spacingly to folded connection piece 10 in the thickness direction of folded connection piece 10.
In the exemplary embodiment shown in fig. 5, the cell holder 30 has a plurality of accommodating grooves 32 distributed in the thickness direction of the cell 20, and the folded connecting piece 10 is fixed in the accommodating grooves 32 by the positioning structure 31. From this, electric core support 30 card is on electric core 20, and folding connection piece 10 is placed in electric core support 30's holding tank 32, and the setting of holding tank 32 makes folding connection piece 10 arrange more regularly, makes power battery 100's appearance more pleasing to the eye.
Further, as shown in fig. 3 and 5, each accommodating groove 32 includes a first groove area 321, a second groove area 322, and a third groove area 323, which are distributed in sequence, where the anode column 21 of one cell 20 of two adjacent cells 20 is located in the first groove area 321, the cathode column 22 of the other cell 20 is located in the third groove area 323, and the second groove area 322 is inclined from the anode column 21 of the one cell 20 to the cathode column 22 of the other cell 20. In order to facilitate the series connection between the battery cells 20, two ends of adjacent battery cells 20 are arranged oppositely, that is, the arrangement directions of the odd-numbered battery cells 20 are the same, the arrangement directions of the even-numbered battery cells 20 are the same, the ends where the anode posts 21 of the odd-numbered battery cells 20 are located and the ends where the cathode posts 22 of the even-numbered battery cells 20 are located at the same end, and the anode posts 21 and the cathode posts 22 of the adjacent battery cells 20 are arranged in a staggered manner in the width direction of the power battery 100. Thus, the above-described shape of the receiving groove 32 facilitates the arrangement of the non-rectangular connecting pieces.
Referring to fig. 3 and 5, the cell holder 30 includes: the two transverse partition plates 33 and the plurality of longitudinal partition plates 34 are opposite to each other in the length direction of the battery cell 20; the two ends of the longitudinal clapboards 34 are respectively connected with the two transverse clapboards 33, the longitudinal clapboards 34 are sequentially distributed in the thickness direction of the battery cell 20, the longitudinal clapboards 34 and the two transverse clapboards 33 jointly define a plurality of accommodating grooves 32, the longitudinal clapboards 34 comprise two longitudinal plates 341 and an inclined plate 342 connected with the two longitudinal plates 341, and the limiting rib 311 of the positioning structure 31 is vertically connected to the longitudinal plates 341. The longitudinal partition 34 is a plate extending substantially in the longitudinal direction, and is not limited to a plate completely perpendicular to the transverse partition 33. Therefore, the battery cell support 30 can be made of an insulating material, such as a plastic piece, so that the longitudinal partition plate 34, the transverse partition plate 33 and the limiting rib 311 are integrally processed conveniently, and the strength of the battery cell support 30 is higher due to the rib-shaped structure in staggered connection.
In some embodiments, the gap between the first electrical connection tab 11a and the second electrical connection tab 11b can be 0.05mm to 0.1 mm. Therefore, the gap with the size can provide assistance for the compression deformation of the connecting piece.
In some embodiments, power cell 100 is a modular battery pack. That is to say, above-mentioned folding connection piece 10 is particularly useful for the power battery package of no module, and traditional battery package that has the module is in putting a plurality of battery module in the battery box, assembles integratively, does not have module battery package and does not set up battery module, directly with the battery box that electric core 20 placed. Therefore, the folding connecting piece 10 not only can electrically connect a plurality of battery cells 20, but also can improve the overall structural strength of the assembled battery cells 20, the assembled battery cell support 30 and the folding connecting piece 10, and improve the strength and reliability of the whole power battery 100.
Further, the battery cell 20 is sheet-shaped. That is, the battery cells 20 have a sheet-like structure, and the thickness of the battery cells 20 is smaller than the length and the width, so that each battery cell 20 has a shape similar to a sheet. Thus, the distance between the battery cell 20 and the battery cell 20 is small, and the folding connecting piece 10 is particularly suitable, so that both the overcurrent capacity and the deformation capacity can be taken into consideration.
Specifically, the length of the battery cell 20 may be 800mm to 1200mm, the width may be 100mm to 200mm, and the thickness may be 10mm to 20 mm. Therefore, the power battery 100 formed by the battery cells 20 with the above sizes is more suitable for being used on an electric vehicle, and the power battery 100 is convenient to mount on a chassis.
The folding connecting sheet 10 for the power battery 100 according to the embodiment of the second aspect of the invention comprises at least two electrical connecting sheets 11 formed by folding, wherein the at least two electrical connecting sheets 11 are distributed in a stacked manner, and the electrical connecting sheets 11 of adjacent layers are connected with each other, at least one electrical connecting sheet 11 of each folding connecting sheet 10 is provided with two through holes 111 for being electrically connected with two adjacent battery cells 20 of the power battery 100 respectively, and the other electrical connecting sheets of each folding connecting sheet 10 are provided with heat dissipation holes 112 corresponding to the through holes 111, as shown in fig. 4.
From this, through adopting folding connection piece 10 to realize the electricity between the adjacent electric core 20 and connecting, folding connection piece 10 can guarantee to flow cross sectional area, can improve folding connection piece 10's deformability again, and when the frock of being convenient for compressed tightly, the connection piece can fully be out of shape, hugs closely the utmost point post of electric core 20. And the design of the heat dissipation holes 112 increases the heat dissipation area of the battery cell 20 pole, and can realize effective cooling of the battery cell 20 and the folding connecting sheet 10.
Referring to fig. 5, the number of the electrical connection sheets 11 is two, and the first electrical connection sheet 11a and the second electrical connection sheet 11b are respectively provided, the first electrical connection sheet 11a is connected to the second electrical connection sheet 11b through the bending portion 12, the first electrical connection sheet 11a has two through holes 111 for welding, the two through holes 111 respectively correspond to the end surfaces of the corresponding anode posts 21 and the corresponding cathode posts 22, and the heat dissipation holes 112 are located on the second electrical connection sheet 11 b. Therefore, by adopting the design of the two electric connection sheets 11, the function of the folding connection sheet 10 can be taken into consideration, the material can be saved, and the cost can be reduced.
As shown in fig. 6, in the structure before folding the connecting sheet 10, the first electrical connecting sheet 11a where the through hole 111 is located after folding is in direct contact with the surface of the battery cell 20, the through hole 111 is a hole for connecting with an electrode column (which may be an anode column or a cathode column) of the battery cell 20, and is also a welding hole, and the laser is welded with the electrode column through the through hole 111.
In some embodiments, the electrical connection sheet 11 has a plurality of limiting grooves 13, a portion of the limiting grooves 13 separates adjacent bending portions 12, and another portion of the limiting grooves 13 is located on a side of the electrical connection sheet 11 opposite to the bending portions 12, as shown in fig. 4.
Therefore, the folding connecting sheet 10 is tightly attached to the pole of the battery cell 20, the limiting rib 311 at least can limit the movement of the battery cell 20 in the Z-axis direction, the limiting rib 311 on the battery cell support 30 can be matched with the limiting groove 13 at the edge of the folding connecting sheet 10 so as to limit the folding connecting sheet 10 in the outer contour of the folding connecting sheet 10, and further, a part of the limiting groove 13 is formed between the adjacent bending parts 12, so that the distribution length of the bending parts 12 is reduced, and the two electric connecting sheets 11 can be more tightly attached to each other.
In some embodiments, referring to fig. 4, the edge of the folding connecting piece 10 includes a first transverse edge 141, a first oblique edge 142, a first vertical edge 143, a second transverse edge 144, a second oblique edge 145, a second vertical edge 146, a third oblique edge 147, and a third vertical edge 148, which are connected end to end in sequence, the first transverse edge 141 and the second transverse edge 144 are disposed opposite to each other, the first oblique edge 142 and the third oblique edge 147 are disposed opposite to each other, the bending portion 12 is located on the first oblique edge 142, and another portion of the limiting groove 13 is formed on the second vertical edge 146. Therefore, the folding connecting piece 10 with the above shape can strengthen the structure of the assembled battery cell 20, the battery cell support 30 and the folding connecting piece 10 while electrically connecting two adjacent battery cells 20.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
In the description of the present invention, "the first feature" and "the second feature" may include one or more of the features. In the description of the present invention, "a plurality" means two or more. In the description of the present invention, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, and may also include the first and second features being in contact with each other not directly but through another feature therebetween. In the description of the invention, "above", "over" and "above" a first feature in a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (17)
1. A power cell, comprising:
the battery comprises a plurality of battery cells which are sequentially arranged along the width direction of the battery, wherein two ends of each battery cell are respectively provided with an anode post and a cathode post;
the battery cell support is fixed with the end parts of a plurality of battery cells respectively;
the battery cell structure comprises a plurality of folding connecting pieces, each folding connecting piece comprises at least two electric connecting pieces formed by folding, the at least two electric connecting pieces are distributed in a stacked mode and are connected with one another between the electric connecting pieces of adjacent layers, each folding connecting piece is connected with an anode column of one battery cell and a cathode column of one adjacent battery cell at the end portion of each battery cell, and the plurality of folding connecting pieces connect the plurality of battery cells in series.
2. The power battery of claim 1, wherein the folding connecting sheet comprises a first electrical connecting sheet and a second electrical connecting sheet, the first electrical connecting sheet is close to the end part of the battery cell, and the anode pole of one battery cell and the cathode pole of the other battery cell are respectively attached to the inner surface of the first electrical connecting sheet and welded with the first electrical connecting sheet.
3. The power battery according to claim 2, wherein the first electrical connection sheet has two through holes for welding, the two through holes respectively corresponding to the end surfaces of the corresponding anode posts and the corresponding cathode posts, and the second electrical connection sheet has heat dissipation holes corresponding to the through holes.
4. The power battery of claim 1, wherein the cell support has a positioning structure for limiting the folding tabs.
5. The power battery of claim 4, wherein the positioning structure comprises a first limiting rib, an outer edge of the folding connecting piece is provided with a limiting groove, and the first limiting rib abuts against the limiting groove in the arrangement direction of the battery cells; and/or
The positioning structure further comprises a second limiting rib, the adjacent electric connecting pieces are connected through bending parts, the bending parts are distributed along the edge of the folding connecting piece and are arranged at intervals, a notch is formed between the adjacent bending parts, and the second limiting rib extends into the notch between the adjacent bending parts.
6. The power battery of claim 4, wherein the positioning structure comprises hooks, and the hooks are respectively clamped on the surfaces, opposite to the battery core, of the folding connecting pieces in the length direction of the battery core.
7. The power battery of any of claims 4-6, wherein the cell support has a plurality of receiving slots distributed along the thickness of the cell, and the folded connecting piece is fixed by the positioning structure in the receiving slots.
8. The power battery of claim 7, wherein each holding tank comprises a first tank region, a second tank region and a third tank region, which are sequentially distributed, wherein an anode column of one of two adjacent cells is located in the first tank region, a cathode column of the other cell is located in the third tank region, and the second tank region is inclined from the anode column of the one cell to the cathode column of the other cell.
9. The power battery of claim 8, wherein the cell support comprises:
the two transverse clapboards are opposite to each other in the length direction of the battery cell;
a plurality of vertical separators, a plurality of vertical separators's both ends respectively with two the cross slab is connected, and is a plurality of vertical separators is in the thickness direction of electricity core distributes in proper order, and is a plurality of holding tank is injectd jointly to vertical separator and two cross slabs, vertical separators includes two vertical plates and connects two the hang plate of vertical plate, location structure's spacing muscle is connected perpendicularly in vertical plate.
10. The power cell of claim 2, wherein the gap between the first electrical connection tab and the second electrical connection tab is 0.05mm to 0.1 mm.
11. The power cell of any of claims 1-6, wherein the power cell is a modular battery pack.
12. The power battery of claim 11, wherein the cells are sheet-shaped.
13. The power battery of claim 12, wherein the cells have a length of 800mm to 1200mm, a width of 100mm to 200mm, and a thickness of 10mm to 20 mm.
14. The folding connecting sheet is characterized by comprising at least two electric connecting sheets formed by folding, wherein the at least two electric connecting sheets are distributed in a stacked mode, the electric connecting sheets of adjacent layers are connected with each other, at least one electric connecting sheet is provided with two through holes used for being respectively welded with two adjacent battery cells of a power battery, and the other electric connecting sheets are provided with heat dissipation holes corresponding to the through holes.
15. The folding connecting sheet according to claim 14, wherein the number of the electrical connecting sheets is two, and the first electrical connecting sheet and the second electrical connecting sheet are respectively provided, the first electrical connecting sheet and the second electrical connecting sheet are connected by a bending portion, the first electrical connecting sheet is provided with two through holes for welding, the two through holes respectively correspond to the end surface of the corresponding anode column and the end surface of the corresponding cathode column, and the heat dissipation hole is located in the second electrical connecting sheet.
16. The folding connecting sheet according to claim 15, wherein the electrical connecting sheet has a plurality of limiting grooves, one part of the limiting grooves separates adjacent bending portions, and the other part of the limiting grooves is located on a side of the electrical connecting sheet opposite to the bending portions.
17. The folding connecting piece of claim 16, wherein the edge of the folding connecting piece comprises a first transverse edge, a first oblique edge, a first vertical edge, a second transverse edge, a second oblique edge, a second vertical edge, a third oblique edge and a third vertical edge which are sequentially connected end to end, the first transverse edge and the second transverse edge are oppositely arranged, the first oblique edge and the third oblique edge are oppositely arranged, the bending part is located at the first oblique edge, and the second vertical edge is formed with the other part of the limiting groove.
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| CN202011497010.2A CN114649616A (en) | 2020-12-17 | 2020-12-17 | Power battery and folding connecting piece for power battery |
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| CN202011497010.2A CN114649616A (en) | 2020-12-17 | 2020-12-17 | Power battery and folding connecting piece for power battery |
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| CN114649616A true CN114649616A (en) | 2022-06-21 |
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