CN219843118U - Current collecting disc, battery unit, battery pack and electricity utilization device - Google Patents

Current collecting disc, battery unit, battery pack and electricity utilization device Download PDF

Info

Publication number
CN219843118U
CN219843118U CN202320904527.1U CN202320904527U CN219843118U CN 219843118 U CN219843118 U CN 219843118U CN 202320904527 U CN202320904527 U CN 202320904527U CN 219843118 U CN219843118 U CN 219843118U
Authority
CN
China
Prior art keywords
current collecting
connection
welding
cover plate
welding area
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202320904527.1U
Other languages
Chinese (zh)
Inventor
庾桃
李立祥
鲁冰
潘秋
张达
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BYD Co Ltd
Original Assignee
BYD Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BYD Co Ltd filed Critical BYD Co Ltd
Priority to CN202320904527.1U priority Critical patent/CN219843118U/en
Application granted granted Critical
Publication of CN219843118U publication Critical patent/CN219843118U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Connection Of Batteries Or Terminals (AREA)

Abstract

The utility model discloses a current collecting disc, a battery cell, a battery pack and an electric device, wherein the current collecting disc comprises a first welding area and a second welding area, the first welding area is suitable for being welded with a tab of a pole core, the second welding area comprises a plurality of second connecting parts, each second connecting part is connected with the first welding area through a buffer part, the buffer part is configured to be movable relative to the first welding area and/or deformable relative to the first welding area so as to change the height difference between the first welding area and the second welding area, and the second welding area is suitable for being welded with a cover plate. According to the current collecting disc, the first welding area and the second welding area are arranged, so that the electrode core and the cover plate can be electrically connected, and meanwhile, the fit clearance between the second welding area and the cover plate can be avoided.

Description

Current collecting disc, battery unit, battery pack and electricity utilization device
Technical Field
The utility model relates to the technical field of batteries, in particular to a current collecting disc, a battery cell, a battery pack and an electric device.
Background
In the prior art, in order to realize the electrical connection between the pole core and the cover plate, a current collecting disc is generally arranged between the pole core and the cover plate, and the current collecting disc is respectively connected with the pole core and the cover plate.
However, when the current collecting tray is connected with the cover plate in a matched manner, the whole large surface is usually utilized for matching, the requirements on the flatness of the connecting surface of the current collecting tray and the connecting surface of the cover plate are high, if the difference of the flatness of a plurality of welding positions on the cover plate is large, gaps are generated on the welding matching surfaces of the current collecting tray and the cover plate, the possibility of cold joint is improved, and the yield of the battery cells is affected.
Disclosure of Invention
The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, a first object of the present utility model is to provide a current collecting disc, which can avoid a gap between welding mating surfaces of the current collecting disc and the cover plate while realizing electrical connection between the pole core and the cover plate, thereby reducing the possibility of cold welding between the current collecting disc and the cover plate and improving the yield of the battery cells.
A second object of the present utility model is to provide a battery cell having the above current collecting plate.
A third object of the present utility model is to provide a battery pack having the above battery cells.
A fourth object of the present utility model is to provide an electric device having the above battery pack.
According to an embodiment of the present utility model, a collecting tray includes: a first welding region adapted to be welded with a tab of a pole core; and a second welding region including a plurality of second connection portions, each of the second connection portions being connected to the first welding region by a buffer member configured to be movable with respect to the first welding region and/or deformable with respect to the first welding region to change a height difference between the first welding region and the second welding region, the second welding region being adapted to be welded with a cover plate.
According to the current collecting disc disclosed by the embodiment of the utility model, the first welding area and the second welding area are arranged, the first welding area and the second welding area are matched to realize the electric connection of the pole core and the cover plate, and meanwhile, the plurality of second connecting parts of the second welding area are all arranged to be connected with the first welding area through the buffer part, so that the height difference between the first welding area and the second welding area, namely the position of the second connecting part relative to the first welding area, is changed, the relative position of the second connecting part and the cover plate is changed, and therefore, even if the flatness difference of a plurality of welding positions on the cover plate is large, the problem that gaps exist between the welding matching surfaces of the current collecting disc and the cover plate is avoided, the possibility of virtual welding is reduced, and the yield of a battery cell is conveniently ensured.
In some embodiments, a plurality of the second connection portions are spaced apart, and the second welding region is configured such that a height difference of each of the second connection portions with respect to the first welding region is independently adjustable.
In some embodiments, the cushioning member is a plate extending obliquely to the first weld area and movable and/or deformable relative to the first weld area.
In some embodiments, the first welding area includes a middle portion and a plurality of first connection portions, the plurality of first connection portions are respectively connected with the middle portion and are arranged at intervals, and the plurality of first connection portions enclose the first welding area forming a circular shape.
In some embodiments, a plurality of the first connection portions and a plurality of the buffer members are alternately arranged in a circumferential direction of the intermediate portion.
In some embodiments, the spacing between the opposing sidewalls of each of the first connection portions increases progressively in a direction away from the intermediate portion.
In some embodiments, the same second connecting portion is provided radially outward of any adjacent two of the first connecting portions in the circumferential direction of the intermediate portion.
In some embodiments, at least one of the second connection portions is provided with a stop protrusion extending towards the first connection portion, the stop protrusion being located radially outward of the first connection portion, the stop protrusion being adapted to be located radially outward of the tab of the pole piece.
In some embodiments, the stop protrusion is defined by a portion of the second connection portion bending deformation.
In some embodiments, the manifold disk is a circular manifold disk; the current collecting disc further comprises a connecting piece, and the connecting piece is connected between two adjacent second connecting parts.
In some embodiments, the second connection has a radial width W 1 The radial width of the connecting piece is W 2 Wherein W is more than or equal to 0.1mm 2 ＜W 1 。
In some embodiments, the connecting piece is disposed near an inner side or an outer side of the second connecting portion, so as to form a limit notch between two adjacent second connecting portions, where the limit notch is adapted to be in limit fit with a limit protrusion on the cover plate.
In some embodiments, the second connection has a radial width W 1 Radial width W of the limit notch 3 The following conditions are satisfied: w is more than or equal to 0.5mm 3 ＜W 1 。
According to an embodiment of the present utility model, a battery cell includes: a housing having an open receiving cavity formed therein; the pole core is provided with a pole lug, the pole core is arranged in the accommodating cavity, and the cover plate is arranged at the opening; the current collecting disc is the current collecting disc, the current collecting disc is arranged between the electrode lug and the cover plate, the first welding area is electrically connected with the electrode lug, the second connecting portion is connected with the cover plate, and the cover plate is suitable for driving the buffer component to move and/or deform relative to the first welding area through the second connecting portion so as to change the height of the current collecting disc.
According to the battery cell provided by the embodiment of the utility model, the electrode core and the cover plate can be electrically connected by adopting the current collecting disc, and meanwhile, gaps between welding matching surfaces of the current collecting disc and the cover plate can be avoided, so that the possibility of cold welding of the current collecting disc and the cover plate is reduced, and the yield of the battery cell is improved.
The battery pack according to the embodiment of the utility model comprises a plurality of the battery cells.
According to the battery pack provided by the embodiment of the utility model, the battery cell is adopted, so that the manufacturing yield of the battery pack can be ensured.
The power utilization device comprises the battery pack.
According to the power utilization device provided by the embodiment of the utility model, the battery pack is adopted, so that the manufacturing yield of the power utilization device can be ensured, and the manufacturing cost can be reduced.
Additional aspects and advantages of the utility model will become apparent in the following description or may be learned by practice of the utility model.
Drawings
The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is a schematic view of a manifold disk according to some embodiments of the first aspect of the present utility model.
Fig. 2 is a top view of a manifold plate according to some embodiments of the first aspect of the utility model.
Fig. 3 is a side view of a manifold plate according to some embodiments of the first aspect of the utility model.
Fig. 4 is a partial enlarged view of the region i in fig. 3.
Fig. 5 is a top view of a manifold plate according to some embodiments of the second aspect of the utility model.
Fig. 6 is a top view of a manifold plate according to some embodiments of the third aspect of the utility model.
Fig. 7 is a top view of a manifold plate according to some embodiments of the fourth aspect of the utility model.
Fig. 8 is a cross-sectional view of a battery cell according to some embodiments of the utility model.
Reference numerals:
1000. a battery cell;
100. a collecting tray;
120. a first welding region; 121. a first connection portion; 122. an intermediate portion;
130. a second welding region;
131. a second connecting portion; 1311. a reinforcing part; 1313. a stop protrusion;
132. limiting notch;
140. a buffer member;
150. a connecting piece;
200. a pole core; 300. a cover plate; 400. a housing.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.
The current collecting tray 100 according to the embodiment of the present utility model is described below with reference to the drawings of the specification.
As shown in fig. 1 and 2, a current collecting plate 100 according to an embodiment of the present utility model includes: a first weld region 120 and a second weld region 130.
Wherein the first welding region 120 is adapted to be welded with a tab of the pole piece 200 (see fig. 8 for a specific structure of the pole piece 200). Here, the electrode core 200 includes a tab, and the first welding region 120 is welded to the tab to achieve welding of the first welding region 120 and the electrode core 200, so that electrical connection of the electrode core 200 and the cap plate 300 is facilitated by the current collecting plate 100.
As shown in fig. 1 and 2, the second welding region 130 includes a plurality of second connection parts 131, each of the second connection parts 131 is connected to the first welding region 120 through a buffer member 140, and the buffer member 140 is configured to be movable with respect to the first welding region 120 and/or deformable with respect to the first welding region 120 to change a height difference between the first welding region 120 and the second welding region 130, and the second welding region 130 is adapted to be welded with the cap plate 300. Here, it means that there is a height difference between the first welding region 120 and the second welding region 130, and the buffer member 140 is configured to be movable with respect to the first welding region 120; alternatively, the cushioning member 140 is configured to be deformable relative to the first weld region 120; still alternatively, the buffer member 140 is configured to be movable with respect to the first welding region 120 and deformable with respect to the first welding region 120, so as to change a height difference between the first welding region 120 and the second welding region 130 by using the buffer member 140, and thus, adjust a position of the second connection portion 131 with respect to the first welding region 120, that is, adjust a relative position of the second connection portion 131 with respect to the cover plate 300.
That is, the position of the second connection portion 131 of the present application is adjustable.
It should be noted that, the difference in height between the first welding area 120 and the second welding area 130 is understood to be that the first welding area 120 and the second welding area 130 are disposed at intervals in the height direction of the battery cell 1000, that is, the disposed heights of the first welding area 120 and the second welding area 130 in the battery cell 1000 are different.
In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.
As can be seen from the above-described structure, the current collecting plate 100 according to the embodiment of the present utility model is configured to include the first welding region 120 and the second welding region 130, and the first welding region 120 and the second welding region 130 cooperate to electrically connect the electrode core 200 and the cap plate 300.
By arranging the plurality of second connecting portions 131, the contact area between the current collecting tray 100 and the cover plate 300 can be increased by matching the plurality of second connecting portions 131, so that the connection strength between the current collecting tray 100 and the cover plate 300 is improved, the relative positions of the current collecting tray 100 and the cover plate 300 are stable, and the position stability of the current collecting tray 100 is improved.
It should be noted that, in the process of connecting the current collecting plate 100 and the cover plate 300, if the position of the second welding area 130 relative to the cover plate 300 is not adjustable, if the difference of the flatness of the welding surfaces of the cover plate 300 is large, or if the difference of the flatness of the plurality of second connection portions 131 is large, a welding gap is formed between the current collecting plate 100 and the cover plate 300, which ultimately increases the possibility of the cold welding between the current collecting plate 100 and the cover plate 300, and affects the yield of the battery cell 1000.
Therefore, in the present application, each of the second connection parts 131 is configured to be connected to the first welding area 120 through the buffer member 140, and because the buffer member 140 is configured to be movable relative to the first welding area 120 and/or deformable relative to the first welding area 120, the height difference between the first welding area 120 and the second welding area 130 is changed by using the buffer member 140, that is, the positions of the plurality of second connection parts 131 relative to the first connection parts 121 are changed, so that even when the difference of the flatness of the plurality of welding positions on the cover plate 300 is large, each of the second connection parts 131 can be ensured to be welded with the cover plate 300, and a gap between the second connection parts 131 and the cover plate 300 is avoided, that is, a gap between the current collecting plate 100 and the cover plate 300 is avoided, the influence caused by manufacturing errors is eliminated, the connection strength of the current collecting plate 100 and the cover plate 300 is further improved, and the degree of the contact surface of the current collecting plate 100 and the cover plate 300 is ensured, so that the possibility of virtual welding is reduced, and the yield of the battery cell 1000 is convenient to be ensured.
It can be also understood that when the current collecting plate 100 is connected to the cover plate 300, the second connecting portion 131 can absorb the manufacturing error of the current collecting plate 100 and/or the cover plate 300, so as to facilitate the subsequent improvement of the manufacturing accuracy of the battery cell 1000.
In a specific example, since the first welding area 120 and the second welding area 130 have a height difference and the buffer member 140 can change the height difference between the first welding area 120 and the second welding area 130, when the current collecting plate 100 is used to connect the cover plate 300 and the pole core 200, the first welding area 120 can be connected with the pole core 200 first, and since the first welding area 120 and the second welding area 130 have a height difference in the height direction of the battery cell 1000, after the first welding area 120 and the pole core 200 are connected in place, in the process of installing the cover plate 300, the second welding area 130 can be arranged close to the cover plate 300, so as to reduce the connection difficulty between the second welding area 130 and the cover plate 300, and since the first welding area 120 and the second welding area 130 can relatively move, when the second welding area 130 is connected with the cover plate 300, the second welding area 130 can be ensured to be changed according to the position, shape, surface structure and the like of the cover plate 300, so that the second welding area 130 can be effectively connected with the cover plate 300, and the connection strength of the battery cell 1000 can be ensured, and the current collecting plate 300 can be connected with the current collecting plate 300, thereby realizing the good connection ratio of the current collecting plate 300 and the current collecting plate 100.
In summary, the current collecting plate 100 of the present application not only can realize the electrical connection between the electrode core 200 and the cover plate 300, but also can avoid the welding gap between the current collecting plate 100 and the cover plate 300, thereby ensuring the yield of the battery cell 1000.
It can be appreciated that, compared to the prior art, the current collecting plate 100 of the present application can solve the technical problem that there is a fit gap between the opposite contact surfaces of the current collecting plate 100 and the cover plate 300 when the current collecting plate 100 is connected to the cover plate 300 in a fit manner, so as to reduce the possibility of cold joint of the current collecting plate 100.
Alternatively, the material of the current collecting plate 100 may be selected from aluminum alloy, pure copper, nickel-plated copper, etc., so that the current collecting plate 100 has a conductive function, thereby facilitating the electrical connection of the electrode core 200 and the cap plate 300 by using the current collecting plate 100.
When the material of the current collecting disc 100 is aluminum alloy, the current collecting disc 100 is mainly welded with the positive lug of the pole core 200 in a matching way; when the material of the current collecting disc 100 is pure copper or nickel-plated copper, the current collecting disc 100 is mainly welded with the negative electrode tab of the electrode core 200 in a matching manner. That is, the material of the current collecting plate 100 may be selected by those skilled in the art according to the application environment of the current collecting plate 100, and the present application is not particularly limited.
It should be noted that the above description mainly describes an example in which the second welding area 130 of the current collecting plate 100 is welded to the cover plate 300.
Of course, in other examples, the second welding region 130 of the current collecting plate 100 may also be welded with the case 400 to electrically connect the electrode core 200 with the case 400 using the current collecting plate 100.
For convenience of description, the second welding region 130 of the current collecting plate 100 is mainly welded to the cover plate 300.
In some examples, in the height direction of the battery cell 1000, the first welding region 120 and the second welding region 130 are parallel to each other, so that the manufacturing difficulty of the first welding region 120 and the second welding region 130 is reduced, and meanwhile, the welding area of the first welding region 120 and the tab is ensured, and the welding area of the second welding region 130 and the cover plate 300 is ensured, so that the electrical connection between the electrode core 200 and the cover plate 300 is effectively realized, and the connection difficulty is reduced.
In the description of the present utility model, a feature defining "first", "second" may explicitly or implicitly include one or more of such feature for distinguishing between the described features, no sequential or light weight fraction.
In some embodiments of the present utility model, as shown in fig. 1 and 2, a plurality of second connection parts 131 are spaced apart, and the second welding region 130 is configured such that a height difference of each second connection part 131 with respect to the first welding region 120 is independently adjustable. That is, each second connecting portion 131 can be independently adjusted with respect to the first welding area 120, so that each second connecting portion 131 can be independently adjusted with respect to the cover plate 300, each second connecting portion 131 can be ensured to be welded with the cover plate 300, gaps between the second connecting portions 131 and the cover plate 300 are avoided, the possibility of cold welding is reduced, and the yield of the battery cell 1000 is conveniently ensured.
In some examples, as shown in fig. 2, each second connecting portion 131 is separately connected to the first welding area 120 through one buffer member 140, and since the buffer member 140 can move and/or deform relative to the first welding area 120, after the second connecting portion 131 is connected to the buffer member 140, it is ensured that the buffer member 140 can move and/or deform relative to the first welding area 120 to change the position of the connected second connecting portion 131, so that the height difference of each second connecting portion 131 relative to the first welding area 120 can be independently adjusted.
Of course, in other examples, after the plurality of second connecting portions 131 are disposed at intervals, each second connecting portion 131 may be disposed to be connected to the first welding area 120 through the plurality of buffer members 140, so that while ensuring that the height difference of each second connecting portion 131 relative to the first welding area 120 is independently adjustable, it is also beneficial to simultaneously support the second connecting portion 131 by using the plurality of buffer members 140, so as to ensure stable positions of the second connecting portions 131, and facilitate stable connection between the second connecting portion 131 and the cover plate 300.
In the description of the present utility model, unless otherwise indicated, the meaning of "plurality" is two or more.
It should be further noted that, by arranging the plurality of second connection portions 131 at intervals, the adjacent second connection portions 131 can be prevented from obstructing each other to move, so that it is ensured that each second connection portion 131 can be individually adjusted in height relative to the first welding area 120, so that the position of the second connection portion 131 can be adjusted.
In some embodiments of the present utility model, as shown in fig. 1 and 3, the buffer member 140 is a plate body extending obliquely with respect to the first welding region 120 and movable and/or deformable with respect to the first welding region 120. Here, the buffer member 140 is a plate body, the plate body extends obliquely to the middle portion 122 and is movable and/or deformable with respect to the first welding region 120, so as to ensure that the buffer member 140 can be moved or deformed with respect to the first welding region 120 under the action of an external force, thereby ensuring that the height difference between the first welding region 120 and the second welding region 130 is changed by the buffer member 140, so as to eliminate the effect of cold welding caused by manufacturing errors. It should be noted that, the current collecting plate 100 is generally made of a metal conductive material such as copper, aluminum, or iron, and has characteristics of elasticity and deformation, and the buffer member 140 is configured as a plate body extending obliquely, which is more beneficial to realizing movement and/or deformation, and is more beneficial to realizing position adjustment of the second connecting portion 131.
In a specific example, the buffer member 140 is a plate body that extends obliquely and can move and/or deform, so when the current collecting tray 100 is used to connect with the pole core 200 and the cover plate 300, if the difference of the flatness of the plurality of welding positions on the cover plate 300 is large, the welding position protruding toward the pole core 200 will generate a force that drives the corresponding second welding region 130 to move toward the pole core 200, and the second welding region 130 is connected with the first welding region 120 through the obliquely extending plate body, and the obliquely extending plate body is easy to change in position or deform under the action of an external force, so that when the protruding welding position drives the corresponding second welding region 130 to move toward the pole core 200, the second welding region 130 can drive the obliquely extending plate body to move, thereby ensuring that the second welding region 130 can effectively move, that is, ensuring that the position change of the second welding region 130 can generate according to the flatness of the cover plate 300, so that the second welding region 130 can connect with the plurality of welding positions on the cover plate 300, and avoiding the existence of the corresponding second welding region 130 and the cover plate 300, and ensuring that the gap between the second welding region 130 and the cover plate 300 can reduce the contact performance of the current collecting tray and the corresponding current collecting tray 300.
It should be noted that, the second welding area 130 can drive the obliquely extending plate body to act, and the specific actions of the plate body may be: the second welding area 130 drives one end of the plate body connected with the second welding area to move towards the pole core 200, and in the process of moving one end of the plate body, the other end of the plate body is fixed relative to the pole core 200 so as to promote the whole plate body to rotate towards the pole core 200, and the buffer part 140 moves relative to the first welding area 120; or, the second welding area 130 drives one end of the plate body connected with the second welding area to bend towards the pole core 200, and in the bending process, the other end of the plate body can be fixed relative to the pole core 200, so that the buffer component 140 deforms relative to the first welding area 120.
In a specific example, the buffer member 140 is formed as a rectangular plate, so that the fixed connection of the second connection portion 131 and the first welding region 120 is facilitated by the buffer member 140, and it is ensured that the second connection portion 131 can be located radially outside the first welding region 120 after the connection is completed.
Of course, in other examples, the buffer member 140 may be formed as a square plate, a fan plate, or the like, and the present application is not particularly limited.
Alternatively, the buffer member 140 is made of a conductive material such as aluminum, copper, or the like. While the connection between the first welding region 120 and the second welding region 130 is achieved by the buffer member 140, and it is ensured that the second welding region 130 can effectively drive the buffer member 140 extending obliquely to act under the action of external force, that is, the buffer member 140 can effectively move and/or deform relative to the first welding region 120 to change the height difference between the first welding region 120 and the second welding region 130.
It should be noted that, the specific length, width and thickness of the buffer member 140 are not limited in the present application, so long as the buffer member 140 is ensured to effectively connect the first welding region 120 and the second welding region 130 is ensured to effectively drive the buffer member 140 extending obliquely to act under the action of external force.
Of course, in other examples, the buffer member 140 may be a buffer spring, one end of the buffer spring is connected to the second connection portion 131, and the other end of the buffer spring is connected to the first welding region 120, so that the buffer member 140 may be configured to be movable with respect to the first welding region 120 and/or deformable with respect to the first welding region 120 to change a height difference between the first welding region 120 and the second welding region 130.
In a specific example, when the buffer member 140 is a buffer spring, when the current collecting plate 100 is used to connect with the pole core 200 and the cover plate 300, if there is a large difference in flatness between the welding positions on the cover plate 300, the welding positions protruding toward the pole core 200 generate a force that drives the corresponding second welding regions 130 to move toward the pole core 200, and the second welding regions 130 compress the buffer spring to cause the buffer spring to deform, thereby changing the height difference between the first welding regions 120 and the second welding regions 130.
In some examples, as shown in connection with FIGS. 1 and 3, cushioning member 140 is inclined at an angle ranging from 5A < 90 relative to first weld zone 120. When the inclination angle range of the buffer member 140 relative to the first welding area 120 is smaller than 5 °, the overall height of the current collecting plate 100 is lower, so that the current collecting plate 100 cannot effectively realize the electrical connection between the electrode core 200 and the cover plate 300; when the inclination angle range of the buffer member 140 relative to the first welding area 120 is greater than or equal to 90 °, on one hand, the overall height of the current collecting disc 100 is higher, and thus the occupied space of the current collecting disc 100 is larger, so that the current collecting disc 100 occupies the layout space of the pole core 200, and further the capacity of the pole core 200 is reduced; on the other hand, the buffer member 140 cannot effectively deform or move, that is, the buffer member 140 cannot effectively change the height difference between the first welding region 120 and the second welding region 130, that is, the problem of cold joint caused by manufacturing errors cannot be solved.
Therefore, the present application sets the range of the inclination angle a of the buffer member 140 with respect to the first welding region 120 to be 5 ° -a < 90 °, and can effectively change the height difference between the first welding region 120 and the second welding region 130 by using the buffer member 140 while ensuring that the electrical connection of the electrode core 200 and the cap plate 300 can be effectively achieved by using the current collecting plate 100, and can also avoid the overall height of the current collecting plate 100 from being excessively high, so as to ensure the capacity of the electrode core 200.
In a specific example, the buffer member 140 may be inclined at an angle a of 5 °, 10 °, 20 °, 30 °, 40 °, 50 °, 60 °, 70 °, 80 °, or the like with respect to the first welding region 120.
Alternatively, the height between the first and second welding regions 120 and 130 ranges from 1mm to 10mm. The specific height values of the first welding area 120 and the second welding area 130 may be adjusted according to the inclination angle a of the buffer member 140, and by setting the height range between the first welding area 120 and the second welding area 130 to be 1 mm-10 mm, the inclination angle a of the buffer member 140 relative to the middle portion 122 may be ensured to be within the range of 5 ° to 90 °, so as to ensure that the height difference between the first welding area 120 and the second welding area 130 may be effectively changed by using the buffer member 140, and meanwhile, the overall height of the current collecting disc 100 may be prevented from being too high, so as to ensure the capacity of the pole core 200.
In particular examples, the height between the first and second weld regions 120, 130 may be 1mm, 3mm, 5mm, 8mm, 10mm, or the like.
It should be emphasized that, in the prior art, since the pole core 200 is spaced from the cover plate 300, a certain height is provided between the pole core 200 and the cover plate 300, and the buffer member 140 is disposed to extend obliquely with respect to the first welding area 120, so that the current collecting plate 100 itself has a certain height, so that the current collecting plate 100 is utilized to realize the electrical connection between the pole core 200 and the cover plate 300, and the current collecting plate 100 is prevented from being bent to increase the height, thereby avoiding damage to the current collecting plate 100, and stress concentration caused by bending of the current collecting plate 100, so as to prolong the service life of the current collecting plate 100.
Meanwhile, according to the present application, a certain height difference exists between the first welding area 120 and the second connection part 131 by providing the buffer member 140, compared with the case that the height is increased by bending the current collecting plate, the occupied space of the current collecting plate 100 in the height direction can be reduced, so that the height of the pole core 200 can be correspondingly increased, and further, the capacity of the pole core 200, that is, the capacity of the battery cell 1000, can be improved.
In some embodiments of the present utility model, as shown in fig. 1 and 2, the first welding area 120 includes a middle portion 122 and a plurality of first connection portions 121, the plurality of first connection portions 121 are respectively connected to the middle portion 122, and the plurality of first connection portions 121 are spaced apart, and the plurality of first connection portions 121 enclose the first welding area 120 forming a circular shape. That is, the first welding region 120 is formed in a circular shape and includes the intermediate portion 122 and the plurality of first connection portions 121, wherein by disposing the first welding region 120 in a circular shape, the first welding region 120 can be adapted to the shape of the pole core 200, thereby ensuring that the first welding region 120 can be effectively connected to the pole core 200 and ensuring the connection area of the first welding region 120 and the pole core 200; by arranging the first welding region 120 to include the middle portion 122 and the plurality of first connection portions 121, when the first welding region 120 is welded with the tab of the pole core 200, the welding area of the first welding region 120 and the tab, that is, the welding area of the current collecting plate 100 and the tab, is increased, on one hand, the connection strength of the current collecting plate 100 and the pole core 200 is improved, and the relative positions of the current collecting plate 100 and the pole core 200 are stable, so that the position stability of the current collecting plate 100 is improved; on the other hand, the current collecting plate 100 can also have a larger overcurrent area, so that the problem that the overcurrent of the pole core 200 is insufficient due to the small overcurrent area of the current collecting plate 100 is avoided, and further, the problem that the heat generation of the pole core 200 is serious is avoided, thereby prolonging the service life of the pole core 200 and improving the use safety of the pole core 200.
Meanwhile, by arranging the plurality of first connection parts 121 to be connected with the intermediate parts 122, respectively, the plurality of first connection parts 121 may be supported by the intermediate parts 122 to improve the positional stability of the plurality of first connection parts 121, thereby facilitating the assurance of the connection strength of the first welding region 120 and the tab.
It should be noted that, in the process of welding the first welding area 120 and the tab, only the plurality of first connection portions 121 may be welded to the tab, and at this time, the middle portion 122 mainly plays a role of supporting the plurality of first connection portions 121, so as to improve the positional stability of the plurality of first connection portions 121; of course, the plurality of first connection portions 121 and the intermediate portion 122 may be disposed to be welded with the tab, so as to further increase the welding area of the first welding area 120 and the tab.
In addition, the plurality of first connecting portions 121 are arranged at intervals so as to avoid the buffer member 140, and it is ensured that the second connecting portions 131 can be effectively connected with the first welding region 120 through the buffer member 140, so that the positions of the second connecting portions 131 can be adjusted.
In some examples, as shown in fig. 1 and 2, the second connection portion 131 is connected to the intermediate portion 122 by a cushioning member 140. That is, the second connecting portion 131 of the present application is mainly connected to the middle portion 122 to connect the second connecting portion 131 to the first welding area 120, and at this time, the middle portion 122 is convenient to support the second connecting portion 131, and the position of the second connecting portion 131 with respect to the first welding area 120 is adjustable.
In specific examples, as shown in fig. 1 and 2, the middle portion 122 forms a circular support plate, the plurality of first connection portions 121 are all formed as fan-shaped connection plates, and the plurality of first connection portions 121 are connected to the radially outer side of the middle portion 122 and are arranged at intervals along the circumferential direction of the middle portion 122, so that after the plurality of first connection portions 121 are connected to the middle portion 122, the first welding area 120 can be formed into a circular shape, so that the shape of the first welding area 120 is adapted to the shape of the pole core 200, and the connection area between the first welding area 120 and the pole core 200 is increased.
In some embodiments of the present utility model, current collecting tray 100 is an integral piece. That is, the current collecting plate 100 is integrally manufactured by an integral molding process, so that the manufacturing difficulty of the current collecting plate 100 can be reduced, the manufacturing efficiency can be improved, and meanwhile, the connection strength and the connection quality among the middle portion 122, the first connection portion 121, the second connection portion 131 and the buffer member 140 can be ensured, so that the current collecting plate 100 has a stable structure, and the electric connection between the pole core 200 and the cover plate 300 can be conveniently realized by using the current collecting plate 100.
In the process of producing the current collecting plate 100, the current collecting plate 100 may be cut, and after the cutting is completed, the buffer member 140 may be bent, so as to form the intermediate portion 122, the first connection portion 121, the second connection portion 131, the buffer member 140, and other structures on the current collecting plate 100.
Specifically, as shown in fig. 1 and 2, the first welding area 120 includes a middle portion 122 and a plurality of first connection portions 121, the middle portion 122 forms a circular aluminum plate or a circular copper plate, the first connection portions 121 are formed as a fan-shaped aluminum plate or a fan-shaped copper plate, the plurality of first connection portions 121 are circumferentially arranged around the middle portion 122 and are respectively connected with the middle portion 122, the plurality of first connection portions 121 are arranged at intervals, a buffer member 140 formed as a rectangular aluminum plate or a rectangular copper plate is arranged between two adjacent first connection portions 121, and in the circumferential direction of the first welding area 120, the buffer member 140 is arranged at intervals with the first connection portions 121, and a first end of the buffer member 140 in the radial direction of the first welding area 120 is connected with the middle portion 122.
Specifically, as shown in connection with fig. 1 and 2, the second welding region 130 includes a plurality of second connection parts 131, the second connection parts 131 are formed as an arc-shaped aluminum plate or an arc-shaped copper plate, the plurality of second connection parts 131 are disposed around the outer circumference of the first welding region 120 with the plurality of second connection parts 131 being spaced apart, the buffer member 140 is connected with a radially middle portion of the second connection parts 131 at a second end of the first welding region 120 in the radial direction, and the buffer member 140 is extended obliquely with respect to the first welding region 120 such that the first welding region 120 and the second welding region 130 are disposed at intervals in the height direction of the battery cell 1000.
In a specific example, when the current collecting plate 100 is connected to the pole core 200 and the cover plate 300 respectively, the first welding area 120 is first connected to the pole core 200, and the first welding area 120 and the second welding area 130 have a height difference in the height direction of the battery cell 1000, so that the cover plate 300 can be effectively in contact with the second welding area 130 in the process of installing the cover plate 300, and in the process of connecting the cover plate 300 to the second welding area 130, if a welding position protruding towards the pole core 200 exists on the cover plate 300, the welding position drives the corresponding second connecting portion 131 to move towards the pole core 200, and at this time, the second connecting portion 131 drives the second end of the buffer member 140 to rotate towards the pole core 200 around the first end or drives the second end of the buffer member 140 to bend towards the pole core 200, so as to achieve the purpose of moving and/or deforming the buffer member 140 relative to the first welding area 120 by using the cover plate 300, so that the height of the current collecting plate 100 can be effectively connected to the cover plate 300, and the possibility of lowering the contact surface of the current collecting plate 100 and the cover plate 300 is ensured.
In some embodiments of the present utility model, as shown in fig. 2, the plurality of first connection parts 121 and the plurality of buffer members 140 are alternately arranged in the circumferential direction of the intermediate part 122. Here, a buffer member 140 is disposed between two adjacent first connection portions 121, and accordingly, a first connection portion 121 is disposed between two adjacent buffer members 140, so that space of the current collecting plate 100 is reasonably utilized, and a plurality of first connection portions 121 and a plurality of buffer members 140 can be simultaneously disposed on the same current collecting plate 100, thereby facilitating an increase in the flow area of the current collecting plate 100 by using the plurality of first connection portions 121, and ensuring that the second connection portion 131 can be connected with the middle portion 122 through the buffer member 140.
In some examples, as shown in fig. 2, the plurality of first connection parts 121 are disposed at intervals in the circumferential direction of the current collecting tray 100, and the buffer members 140 are disposed between adjacent two of the first connection parts 121, so that the plurality of first connection parts 121 and the plurality of buffer members 140 can be alternately disposed in the circumferential direction of the intermediate part 122, thereby realizing the simultaneous disposition of the plurality of first connection parts 121 and the plurality of buffer members 140 on the current collecting tray 100.
Optionally, as shown in fig. 2, the buffer member 140 and the first connection portion 121 are spaced apart in the circumferential direction of the current collecting plate 100, so as to avoid the first connection portion 121 from obstructing the deformation and/or movement of the buffer member 140, that is, to ensure that the buffer member 140 can effectively move and/or deform with respect to the first welding region 120 to change the height difference between the first welding region 120 and the second welding region 130, thereby eliminating the effect of cold welding caused by manufacturing errors.
Optionally, the current collecting disc 100 is a circular current collecting disc, so that the shape of the current collecting disc 100 can be adapted to the shapes of the pole core 200 and the cover plate 300, so as to reduce the connection difficulty between the current collecting disc 100 and the pole core 200 and the cover plate 300, and ensure the connection quality.
Here, the fact that the collecting tray 100 is configured as a circular collecting tray is understood to mean that the orthographic projection of the outer circumferential wall of the collecting tray 100 is located on the circular ring in a first plane, which is a plane perpendicular to the thickness direction of the collecting tray 100.
Alternatively, the circumferential distance between the buffer member 140 and the first connection part 121 ranges from 0.5mm to 2mm. It will be understood herein that the distance between the buffer member 140 and the first connection portion 121 in the circumferential direction of the circular collecting tray 100 is in the range of 0.5mm to 2mm to achieve the spaced arrangement of the buffer member 140 and the first connection portion 121, ensuring that the buffer member 140 can be effectively moved and/or deformed with respect to the first welding area 120.
In some embodiments of the present utility model, as shown in fig. 2, the spacing between the opposite sidewalls of each first connection portion 121 increases gradually in a direction away from the middle portion 122. To increase the area of the first connection portion 121, thereby ensuring that the first connection portion 121 and the tab of the pole core 200 have enough welding area, so as to ensure that the current collecting plate 100 has larger overcurrent area, avoid the insufficient overcurrent of the pole core 200 caused by small overcurrent area of the current collecting plate 100, and further avoid the serious heat generation problem of the pole core 200, so as to prolong the service life of the pole core 200 and improve the use safety of the pole core 200.
In some examples, the first connection portion 121 may be formed in a fan shape in fig. 2, which may cause a spacing between opposite sidewalls of the first connection portion 121 to gradually increase in a direction away from the middle portion 122, thereby enabling an increase in an area of the first connection portion 121.
Of course, in other examples, the first connection part 121 may be formed in a triangle, a rectangle, a circle, or the like, and the present utility model is not particularly limited.
In some embodiments of the present utility model, as shown in fig. 2, the same second connecting portion 131 is provided radially outside any adjacent two first connecting portions 121 in the circumferential direction of the intermediate portion 122. Here, the radially outer side of the first connecting portion 121 may be understood as a radially side of the first connecting portion 121 away from the intermediate portion 122, and thus, it may be understood that the second connecting portion 131 is disposed at a radially side of the first connecting portion 121 away from the intermediate portion 122, and the second connecting portions 131 disposed radially outwardly of the adjacent two first connecting portions 121 are the same second connecting portion 131, and in the process of disposing the first connecting portions 121 and the buffer member 140, the buffer member 140 is disposed mainly between the adjacent two first connecting portions 121, and therefore, the same second connecting portion 131 is disposed radially outwardly of the adjacent two first connecting portions 121 to ensure that the second connecting portion 131 can be connected with the buffer member 140 disposed between the adjacent two first connecting portions 121, thereby ensuring that the buffer member 140 can effectively drive the second connecting portion 131 to move to change the height difference between the first welding region 120 and the second welding region 130.
In addition, through the above arrangement, the buffer component 140 can be connected to the radial middle part of the second connecting portion 131, so that it is further ensured that the buffer component 140 can effectively drive the second connecting portion 131 to move when moving or deforming, that is, after the second connecting portion 131 changes position under the action of external force, the second connecting portion 131 can effectively drive the buffer component 140 to move and/or deform, so as to change the height difference between the first welding area 120 and the second welding area 130.
Meanwhile, the second connecting portion 131 is disposed radially outside the first connecting portion 121, so that a sufficient space is ensured for disposing the second connecting portion 131, so as to increase the area of the second connecting portion 131, further increase the welding area between the second connecting portion 131 and the cover plate 300, and realize the fixed connection between the second connecting portion 131 and the cover plate 300.
Of course, in other examples, the second connection portion 131 may be disposed between two adjacent first connection portions 121 (not shown in the example drawings), which is not particularly limited by the present utility model.
In some embodiments of the present utility model, as shown in connection with fig. 1, 3 and 4, at least one second connection part 131 is provided with a stop protrusion 1313, the stop protrusion 1313 extending toward the first connection part 121, the stop protrusion 1313 being located radially outward of the first connection part 121, the stop protrusion 1313 being adapted to be located radially outward of the tab 200. The radially outer side here also means a radially side of the first connecting portion 121 away from the middle portion 122, and the stop protrusion 1313 may play a role in reinforcing the second connecting portion 131, that is, increasing the structural strength of the second connecting portion 131, avoiding deformation when the second connecting portion 131 is welded to the cover plate 300, so as to ensure that the second connecting portion 131 can be stably connected to the cover plate 300; on the other hand, the second connection portion 131 is convenient to define the position of the tab, so that the tab can be stably arranged on the pole core 200, and therefore the occurrence of failure of the pole core 200 caused by loose pulling of the welding seam of the tab under actual working conditions is prevented.
In some examples, as shown in fig. 1 and 4, each of the second connection parts 131 is provided with a stop protrusion 1313, and it is convenient to define the position of the tab by using a plurality of stop protrusions 1313 in cooperation while ensuring that the structural strength of each of the second connection parts 131 can be reinforced, thereby further ensuring that the tab can be stably provided on the tab core 200.
Meanwhile, the plurality of stop protrusions 1313 cooperate to protect the tab, so as to prolong the service life of the tab, that is, the service life of the core 200.
Optionally, the extension length of the stop protrusion 1313 extending toward the first connection part 121 is greater than or equal to the exposed height of the tab, so as to ensure that the stop protrusion 1313 can effectively protect the tab and define the position of the tab.
In a specific example, the tab has an exposed height in the range of 0.5mm-2mm. That is, the stop projection 1313 extends toward the first connecting part 121 by an extension length of more than 0.5mm.
Alternatively, as shown in conjunction with fig. 3 and 4, the stop projection 1313 is defined by a portion of the second coupling part 131 bending deformation. That is, in the process of manufacturing the second connection part 131, a portion of the structure of the second connection part 131 is bent and deformed to form the stop protrusion 1313, so that it is not necessary to separately connect structural members to the second connection part 131 to form the stop protrusion 1313, the manufacturing difficulty of the stop protrusion 1313 is reduced, that is, the manufacturing difficulty of the second connection part 131 is reduced, and the positional stability of the stop protrusion 1313 is improved.
Alternatively, as shown in fig. 1, 3 and 4, the outer circumference of the stopper boss 1313 is provided with a reinforcement 1311. The reinforcement portion 1311 is used to improve structural strength of the stop protrusion 1313 and the second connection portion 131, prevent the second connection portion 131 from being deformed when being connected with the cap plate 300, and ensure that the stop protrusion 1313 can effectively protect the tab and define the position of the tab.
Alternatively, as shown in conjunction with fig. 3 and 4, the stop boss 1313 and the reinforcement 1311 have a rounded transition near the junction of the tab. The method can effectively protect the tab and limit the position of the tab by using the stop projection 1313, and can also avoid stress concentration at the joint of the stop projection 1313 and the reinforcement part 1311, and can also avoid damage to the tab when the stop projection 1313 collides with the tab, thereby ensuring that the stop projection 1313 can effectively protect the tab to effectively limit the position of the tab.
In some embodiments of the present utility model, as shown in fig. 2, the minimum distance G between two adjacent second connection portions 131 1 The following conditions are satisfied:
1mm≤G 1 ≤ΠR/n 1 ；
wherein the collecting plate 100 is a circular collecting plate, R is the radius of the circular collecting plate, pi is the circumference ratio, pi is about 3.14, n 1 Is the number of areas between the plurality of second connection parts 131.
That is, two adjacent second connecting portions 131 are disposed at intervals, and the distance between two adjacent second connecting portions 131 needs to satisfy a certain condition, so that the forming difficulty of the second connecting portions 131 is reduced, and meanwhile, the second connecting portions 131 can be ensured to have a sufficient area, and further, the second connecting portions 131 and the cover plate 300 are ensured to have a sufficient welding area.
Since the adjacent two second connection portions 131 are spaced apart from each other, a space is formed between the adjacent two second connection portions 131, so that the above-mentioned n 1 It is understood to be the number of spacers.
In some examples, the radius r=10 mm to 100mm of the circular current collecting disc, that is, the radius of the current collecting disc 100 is between 10mm to 100mm, so as to ensure that the size of the current collecting disc 100 can be adapted to the pole core 200 and the cover plate 300 at the same time, thereby facilitating the electrical connection between the pole core 200 and the cover plate 300 by using the current collecting disc 100 and ensuring that the current collecting disc 100 has a sufficient welding area with the pole core 200 and the cover plate 300.
Of course, in other examples, the radius R of the current collecting plate 100 is not limited to 10mm to 100mm, and those skilled in the art may define the radius of the current collecting plate 100 according to the actual areas of the electrode core 200 and the cover plate 300, so as to ensure that the current collecting plate 100 has a sufficient welding area with the electrode core 200 and the cover plate 300.
It should be noted that, when the radius of the current collecting plate 100 changes, the distance G between two adjacent second connection portions 131 1 A corresponding change will occur.
Alternatively, as shown in FIG. 2, the radius of the first weld region 120 is R, R.gtoreq.r. That is, the radius of the first welding region 120 is less than or equal to the radius of the current collecting disc 100, wherein when the radius of the first welding region 120 is less than the radius of the current collecting disc 100, a space may be provided for the arrangement of the second welding region 130, ensuring that the second welding region 130 can be arranged radially outside the first welding region 120 so as to ensure the areas of the first and second connection parts 121 and 131; when the radius of the first welding area 120 is equal to the radius of the current collecting disc 100, the welding area of the first welding area 120 and the pole core 200 can be ensured to reach the maximum value, the impedance of the pole core 200 can be reduced, the large current passing capability of the pole core 200 is met, and the whole current passing capability of the current collecting disc 100 is improved.
Alternatively, as shown in FIG. 2, the radius of the intermediate portion 122 is r 1 Wherein, 5mm < r 1 < 1/2r. The radius of the intermediate portion 122 is also understood to mean the radial dimension of the intermediate portion 122 when the intermediate portion 122 forms a circular support plate, and the radius of the first welding region 120 is a constant value, and the radius r of the intermediate portion 122 is set 1 And r to ensure that the first welding area 120 and the middle portion 122 have a certain connection area, thereby realizing the fixed connection between the current collecting plate 100 and the pole core 200 and ensuring that the current collecting plate 100 has a larger overcurrent area.
In some embodiments of the present utility model, as shown in FIG. 2, the radial width of the second connecting portion 131 is W 1 Wherein, W is more than or equal to 1mm 1 And 1/2R, R is the radius of the collector plate 100. Since the current collecting plate 100 is a circular current collecting plate, the first welding area 120 is circular, and the second connecting portion 131 is disposed radially outside the first welding area 120, the radial width of the second connecting portion 131 is understood to be the width of the second connecting portion 131 extending in the radial direction of the current collecting plate 100.
Because in some examples, the second connection portion 131 is disposed radially outside the first connection portion 121, and the radius of the current collecting disc 100 is fixed, the above arrangement ensures that the welding area of the second connection portion 131 can meet the minimum welding requirement, and also ensures that the first connection portion 121 has a sufficient welding area, so as to facilitate the electrical connection between the electrode core 200 and the cover plate 300 by using the current collecting disc 100.
In specific examples, as shown in fig. 2, the second connection portion 131 is provided radially outside the first welding region 120 while extending circumferentially and radially along the current collecting plate 100 such that the second connection portion 131 forms a similar rectangular shape as shown in fig. 2.
Of course, in other examples, the shape of the second connection portion 131 may be triangular, circular, or other shapes, which is not particularly limited in the present utility model.
In some embodiments of the present utility model, as shown in fig. 5, the manifold disc 100 is a circular manifold disc; the collecting tray 100 further includes a connection member 150, and the connection member 150 is connected between adjacent two of the second connection parts 131. That is, the connecting member 150 is disposed between the adjacent two second connecting portions 131, and one end of the connecting member 150 is connected to one of the adjacent two second connecting portions 131, and the other end of the connecting member 150 is connected to the other of the adjacent two second connecting portions 131, so that the structural strength of the second welding region 130 is improved by using the connecting member 150, and the service life of the second welding region 130 is prolonged.
In some examples, the connecting piece 150 and the second connecting portion 131 are integrally formed, so that the difficulty in manufacturing the current collecting plate 100 is reduced, and meanwhile, the connection strength between the connecting piece 150 and the second connecting portion 131 can be increased, so that the second welding area 130 is stable in structure, and the fixed connection between the second welding area 130 and the cover plate 300 is facilitated.
The shape of the current collecting disc 100 can be adapted to the shapes of the pole core 200 and the cover plate 300 by arranging the current collecting disc 100 into a circular current collecting disc, so that the connection difficulty between the current collecting disc 100 and the pole core 200 and the connection difficulty between the current collecting disc 100 and the cover plate 300 are reduced, and the connection quality can be ensured.
Alternatively, the process may be carried out in a single-stage,as shown in fig. 5, the radial width of the second connection portion 131 is W 1 The radial width of the connection member 150 is W 2 Wherein W is more than or equal to 0.1mm 2 ＜W 1 . The radial width of the second connection part 131 refers to the length of the second connection part 131 extending along the radial direction of the circular collecting disc, and the radial width of the connection member 150 refers to the length of the connection member 150 extending along the radial direction of the circular collecting disc, that is, the connection member 150 and the second connection part 131 have a certain width in the radial direction of the collecting disc 100, but the radial width of the connection member 150 is smaller than the radial width of the second connection part 131, so that the connection member 150 can be prevented from blocking the movement of the second connection part 131 while the structural strength of the second welding area 130 is ensured to be improved by the connection member 150.
In some examples, the radial width of the connecting piece 150 is set smaller than the radial width of the second connecting portion 131 to ensure that when the buffer component 140 drives the second connecting portion 131 to move, the connecting piece 150 can deform synchronously, so that the second connecting portion 131 can move normally, and a welding gap between the second connecting portion 131 and the cover plate 300 is avoided.
Alternatively, the connection member 150 is a connection plate, and the plate-shaped structure may enable the connection member 150 to deform under an external force.
In a specific example, the connection member 150 is formed of a rectangular aluminum plate or a rectangular copper plate, so that the connection member 150 can be synchronously deformed when the buffer member 140 moves the second connection portion 131.
It should be noted that, the thickness of the connecting member 150 is not particularly limited in the present application, so long as the connecting member 150 is ensured to be capable of being deformed synchronously during the process of the buffer member 140 driving the second connecting portion 131 to move.
Here, the deformation is understood to mean that one end of the connection member 150 in the radial direction is rotated or bent toward the pole core 200 with respect to the other end of the connection member 150 in the radial direction.
Alternatively, as shown in fig. 6 and 7, the connecting member 150 is disposed near the inner side or the outer side of the second connecting portion 131, so as to form a limiting notch 132 between two adjacent second connecting portions 131, where the limiting notch 132 is adapted to be in limiting engagement with the limiting protrusion on the cover 300. The inner side surface of the second connecting portion 131 herein refers to a side surface of the second connecting portion 131 near the first welding area 120, the outer side surface of the second connecting portion 131 refers to a side surface of the second connecting portion 131 far away from the first welding area 120, that is, a limiting protrusion is disposed on the cover plate 300, the connecting member 150 is disposed near the inner side surface or the outer side surface of the second connecting portion 131, and a limiting gap 132 in spacing fit with the limiting protrusion can be formed between two adjacent second connecting portions 131, wherein after spacing fit between the limiting protrusion and the limiting gap 132, positioning fit between the second welding area 130 and the cover plate 300 can be realized, and relative position change between the second welding area 130 and the cover plate 300 in the welding process is avoided, so that the welding difficulty between the second welding area 130 and the cover plate 300 is reduced, and the welding efficiency is improved.
In addition, the connecting piece 150 is arranged close to the inner side or the outer side of the second connecting portion 131, so that the limiting gap 132 can be formed between two adjacent second connecting portions 131, and thus the limiting gap 132 does not need to be separately arranged in the second welding area 130, so as to reduce the forming difficulty of the limiting gap 132, and meanwhile, the welding area between the second connecting portion 131 and the cover plate 300 can be prevented from being reduced due to the arrangement of the limiting gap 132, and the second connecting portion 131 and the cover plate 300 are ensured to have enough welding area.
Alternatively, as shown in fig. 6 and 7, the radial width of the second connecting portion 131 is W 1 Radial width W of limit notch 132 3 The following conditions are satisfied: w is more than or equal to 0.5mm 3 ＜W 1 . The radial width of the limiting gap 132 refers to the length of the limiting gap 132 extending along the radial direction of the circular current collecting disc, that is, the limiting gap 132 has a certain width in the radial direction of the current collecting disc 100, so that the limiting gap 132 is convenient to form, so that the positioning fit between the second connecting portion 131 and the cover plate 300 is convenient to be realized by using the limiting gap 132, and meanwhile, the radial width of the limiting gap 132 is set to be smaller than the radial width of the second connecting portion 131, so that the connecting member 150 can be arranged between two adjacent second connecting portions 131, and the structural strength of the second welding area 130 is convenient to be improved by using the connecting member 150.
Alternatively, as shown in fig. 6 and 7, the limiting notches 132 are plural, and in the radial direction of the second connecting portion 131, the limiting notches 132 are disposed opposite to the first connecting portions 121. Wherein, by arranging the limiting notches 132 in a plurality of numbers, the second connecting portion 131 and the cover plate 300 can be ensured to be effectively positioned and matched; through setting up a plurality of spacing breach 132 and a plurality of first connecting portion 121 to just setting one by one, can make spacing breach 132 keep away from buffer 140 setting to avoid spacing breach 132 to influence the fixed connection of second connecting portion 131 and middle portion 122, that is ensure that spacing breach 132 can effectively realize second connecting portion 131 and apron 300 locate fit in the time, still can ensure that second connecting portion 131 and middle portion 122 can effectively carry out fixed connection, in order to guarantee the position stability and the structural strength of collecting tray 100.
It should be noted that, the figure shows the case that the front projection of the limiting notch 132 on the first plane is formed as a rectangle, and the first plane is perpendicular to the thickness direction of the current collecting tray 100; in other examples, the orthographic projection of the limiting notch 132 on the first plane is formed as a square, triangle, fan, etc.
The battery cell 1000 according to the embodiment of the present utility model is described below with reference to the drawings of the specification.
As shown in fig. 8, a battery cell 1000 according to an embodiment of the present utility model includes: the housing 400, the pole core 200, the cover plate 300 and the current collecting plate 100.
Wherein a receiving chamber having an opening is formed in the housing 400. The opening is adapted to allow communication between the interior and exterior of the receiving cavity to ensure that an external component (e.g., pole piece 200) can be disposed within the receiving cavity.
The pole core 200 is provided with a pole lug, and the pole core 200 is arranged in the accommodating cavity. That is, the pole core 200 is adapted to be disposed in the housing 400, so that the pole core 200 is protected by the housing 400, thereby prolonging the service life of the pole core 200 and improving the use safety of the pole core 200.
The cover 300 is provided at the opening. For blocking the opening, prevent external foreign matters, dust, etc. from entering the accommodating cavity through the opening, and further improve the use safety of the pole core 200.
The current collecting plate 100 is the aforementioned current collecting plate 100, the current collecting plate 100 is disposed between the tab and the cover plate 300, the first welding area 120 is electrically connected with the tab, the second connecting portion 131 is connected with the cover plate 300, and the cover plate 300 is adapted to drive the buffer member 140 to move and/or deform relative to the first welding area 120 through the second connecting portion 131 so as to change the height of the current collecting plate 100.
As can be seen from the above structure, in the battery cell 1000 according to the embodiment of the present utility model, by adopting the current collecting plate 100 and arranging the first welding area 120 to be electrically connected with the tab, the welding area between the current collecting plate 100 and the tab can be ensured, so as to realize the fixed connection between the current collecting plate 100 and the tab core 200.
Through setting the second connecting portion 131 to be connected with the cover plate 300, in the process of being connected with the cover plate 300, the cover plate 300 can drive the buffer component 140 to move and/or deform relative to the first welding area 120 through the second connecting portion 131, so that the connection matching surface of the current collecting disc 100 and the cover plate 300 can change in position according to the planeness of the connection matching surface of the cover plate 300, the fitting degree of the current collecting disc 100 and the cover plate 300 is further ensured, gaps between the current collecting disc 100 and the cover plate 300 are avoided, the possibility of cold welding is reduced, and the yield of the battery cell 1000 is ensured.
Meanwhile, the structural stability of the battery cell 1000 may also be improved by adopting the aforementioned current collecting plate 100.
That is, the battery cell 1000 of the present utility model has the advantages of stable structure and high yield by using the current collecting plate 100.
Optionally, the battery cell 1000 is a cylindrical battery, so that the structures (pole core 200, cover plate 300) within the battery cell 1000 can be adapted to a circular current collecting tray.
In some examples, the area of the orthographic projection of the first connection portion 121 on the first plane is S 1 The minimum connection area between the first connection portion 121 and the tab is S, where s=γs 1 Gamma is more than or equal to 0.2 and less than or equal to 1, and the first plane is perpendicular to the thickness direction of the collecting tray 100. That is, the minimum connection area of the first connection portion 121 and the tab may be smaller than the orthographic projection area of the first connection portion 121 on the first plane, but stillThe first connection part 121 and the tab are ensured to have a sufficient connection area to ensure the overcurrent capability of the current collecting plate 100.
In addition, the minimum connection area of the first connection portion 121 and the tab is set smaller than the orthographic projection area of the first connection portion 121 on the first plane, so that the connection difficulty between the current collecting plate 100 and the tab can be reduced, and the assembly efficiency of the battery cell 1000 can be improved.
It should be noted that, in some examples, in order to ensure that a worker can effectively determine whether the minimum connection area between the first connection portion 121 and the tab meets the requirement, a minimum connection area may be provided on the first connection portion 121, and when the minimum connection areas are all connected to the tab, it is determined that the minimum connection area between the first connection portion 121 and the tab meets the requirement.
Optionally, the first connecting portion 121 is provided with a plurality of positioning portions, such as: the positioning grooves or the positioning protrusions form a minimum connection area in the area surrounded by the positioning parts.
In some examples, the minimum connection area S of the first connection portion 121 and the tab may be determined according to the minimum overcurrent requirement C of the pole core 200, wherein the minimum connection area S of the first connection portion 121 and the tab and the minimum overcurrent requirement C of the pole core 200 need to satisfy the following conditions:
n 2 NKS≥C；
wherein n is 2 The number of first connecting portions 121; n is a compensation coefficient, n=0.7 to 1; k is the overcurrent coefficient of the first connection portion 121.
It should be noted that, K may be directly determined according to the material of the first connection portion 121, and the unit is AH/mm2; the minimum overcurrent requirement C of the pole core 200 can be determined according to the required charging time of the pole core 200, and the specific determination mode is that in the actual production process of the battery cell 1000, the quick charging time required to be met by the battery cell 1000 to be produced can be directly determined, that is, the charging time of the battery cell 1000 can be clearly known, the charging time of the pole core 200 is determined according to the charging time of the battery cell 1000, then the minimum overcurrent requirement C of the pole core 200 is obtained according to the charging time of the pole core 200, and finally the minimum connecting area S of the first connecting portion 121 and the pole lug is calculated according to the minimum overcurrent requirement C, so that the minimum connecting area S of the first connecting portion 121 and the pole lug and the minimum overcurrent requirement C of the pole core 200 can meet certain conditions, thereby ensuring that the overcurrent capability of the current collecting disc 100 can meet the minimum overcurrent requirement of the pole core 200, avoiding causing the insufficient overcurrent of the pole core 200 and avoiding the serious problem of heat generation of the pole core 200, and further prolonging the service life of the pole core 200 and improving the service safety of the pole core 200.
In particular examples, the minimum overcurrent requirement of the pole piece 200 is c=15 AH to 120AH.
Optionally, the connection width H of the first connection portion 121 and the middle portion 122 and the minimum overcurrent requirement C of the pole core 200 also need to satisfy a certain condition to further ensure the overcurrent capability of the current collecting tray 100.
Here, the connection width H is understood to be a straight line distance between opposite sidewalls of the connection position of the first connection portion 121 and the intermediate portion 122. That is, there are two side walls disposed opposite to each other at the connection position of the first connection portion 121 and the intermediate portion 122, and the straight-line distance between the two side walls forms a connection width H (the connection width H can be seen in fig. 2 in particular) of the first connection portion 121 and the intermediate portion 122.
Specifically, the connection width H between the first connection portion 121 and the intermediate portion 122 and the minimum overcurrent requirement C of the pole core 200 satisfy the following conditions:
n 2 KHδ≥C；
wherein n is 2 The number of first connecting portions 121; delta is the thickness of the first connecting portion 121; k is the overcurrent coefficient of the current collecting disc 100, and K can be directly determined according to the material of the current collecting disc 100 and is expressed in AH/mm2.
That is, in the actual production process of the battery cell 1000, not only the minimum connection area S of the first connection portion 121 and the tab and the minimum overcurrent requirement C of the pole core 200 are ensured to meet certain conditions, but also the connection width H of the first connection portion 121 and the middle portion 122 and the minimum overcurrent requirement C of the pole core 200 are ensured to meet certain conditions, so as to effectively ensure the overcurrent capability of the current collecting tray 100.
The specific method for determining the connection width H between the first connection portion 121 and the intermediate portion 122 is as follows: in the actual production process of the battery cell 1000, the charging time of the battery cell 1000 can be directly determined, after the charging time of the battery cell 1000 is clear, the charging time of the pole core 200 is firstly determined according to the charging time of the battery cell 1000, the minimum overcurrent requirement C of the pole core 200 is obtained according to the charging time of the pole core 200, and finally the connection width H of the first connection part 121 and the middle part 122 is calculated according to the minimum overcurrent requirement C, the number of the first connection parts 121 and the thickness of the first connection part 121, so that the connection width H of the first connection part 121 and the middle part 122 and the minimum overcurrent requirement C of the pole core 200 meet certain conditions.
The battery pack of the embodiment of the present utility model is described below.
A battery pack according to an embodiment of the present utility model includes: each of the plurality of battery cells 1000 is the aforementioned battery cell 1000.
As can be seen from the above structure, the battery pack according to the embodiment of the present utility model can effectively ensure the manufacturing yield of the battery pack by adopting the battery cell 1000.
The following describes an electric device according to an embodiment of the present utility model.
An electrical device according to an embodiment of the present utility model includes: the battery pack is the battery pack.
As can be seen from the above structure, the power consumption device according to the embodiment of the present utility model adopts the battery pack, that is, the battery cell 1000 described above is adopted, so as to effectively ensure the manufacturing yield of the power consumption device and reduce the manufacturing cost.
The electric device may be a vehicle, an energy storage cabinet, a ship, an aircraft, or the like.
In the description of the present utility model, 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 mechanically or electrically connected; 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 utility model will be understood in specific cases by those of ordinary skill in the art.
Six first connecting portions 121 and six second connecting portions 131 are shown in fig. 1 and 2 for illustrative purposes, but it is obvious to one skilled in the art after reading the above technical solution that the solution is extended to other number of first connecting portions 121 and second connecting portions 131, which falls within the scope of the present utility model.
Other constructions of the current collecting tray 100, the battery cells 1000, the battery pack, and the power consuming device according to the embodiment of the present utility model are known to those skilled in the art, and will not be described in detail herein.
In the description herein, reference to the term "embodiment," "example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (16)

1. A manifold disk comprising:
a first welding region adapted to be welded with a tab of a pole core;
And a second welding region including a plurality of second connection portions, each of the second connection portions being connected to the first welding region by a buffer member configured to be movable with respect to the first welding region and/or deformable with respect to the first welding region to change a height difference between the first welding region and the second welding region, the second welding region being adapted to be welded with a cover plate.
2. The manifold plate of claim 1, wherein a plurality of said second connection portions are spaced apart, said second weld areas being configured such that a height differential of each of said second connection portions relative to said first weld areas is independently adjustable.
3. The current collecting tray according to claim 1, wherein the buffer member is a plate body extending obliquely to the first welding area and movable and/or deformable with respect to the first welding area.
4. The current collecting tray according to claim 1, wherein the first welding area includes a middle portion and a plurality of first connection portions, the plurality of first connection portions being connected to the middle portion, respectively, and the plurality of first connection portions being disposed at intervals, the plurality of first connection portions enclosing the first welding area forming a circular shape.
5. The current collecting tray according to claim 4, wherein a plurality of the first connection portions and a plurality of the buffer members are alternately arranged in a circumferential direction of the intermediate portion.
6. The manifold disk of claim 4, wherein the spacing between the opposing sidewalls of each of said first connecting portions increases progressively in a direction away from said intermediate portion.
7. The collecting tray according to claim 4, wherein the same second connecting portion is provided radially outwardly of any adjacent two of said first connecting portions in the circumferential direction of said intermediate portion.
8. The current collecting tray according to claim 4, wherein at least one of the second connection portions is provided with a stop protrusion extending toward the first connection portion, the stop protrusion being located radially outward of the first connection portion, the stop protrusion being adapted to be located radially outward of the tab of the pole core.
9. The manifold disk of claim 8, wherein said stop tab is defined by a portion of said second connecting portion being bent and deformed.
10. The manifold disc of any one of claims 1-9, wherein the manifold disc is a circular manifold disc;
The current collecting disc further comprises a connecting piece, and the connecting piece is connected between two adjacent second connecting parts.
11. The manifold disk of claim 10, wherein said second connection portion has a radial width W 1 The radial width of the connecting piece is W 2 Wherein W is more than or equal to 0.1mm 2 ＜W 1 。
12. The tray of claim 10, wherein said connector is disposed adjacent an inner or outer side of said second connector portions to form a spacing gap between adjacent two of said second connector portions, said spacing gap being adapted for spacing engagement with a spacing protrusion on said cover plate.
13. The manifold disk of claim 12, wherein said second connection portion has a radial width W 1 Radial width W of the limit notch 3 The following conditions are satisfied: w is more than or equal to 0.5mm 3 ＜W 1 。
14. A battery cell, comprising:
a housing having an open receiving cavity formed therein;
the pole core is provided with a pole lug, the pole core is arranged in the accommodating cavity, and the cover plate is arranged at the opening;
a current collecting disc, wherein the current collecting disc is a current collecting disc according to any one of claims 1-13, the current collecting disc is arranged between the tab and the cover plate, the first welding area is electrically connected with the tab, the second connecting portion is connected with the cover plate, and the cover plate is suitable for driving the buffer component to move and/or deform relative to the first welding area through the second connecting portion so as to change the height of the current collecting disc.
15. A battery pack comprising a plurality of the battery cells according to claim 14.
16. An electrical device comprising the battery pack of claim 15.
CN202320904527.1U 2023-04-14 2023-04-14 Current collecting disc, battery unit, battery pack and electricity utilization device Active CN219843118U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202320904527.1U CN219843118U (en) 2023-04-14 2023-04-14 Current collecting disc, battery unit, battery pack and electricity utilization device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202320904527.1U CN219843118U (en) 2023-04-14 2023-04-14 Current collecting disc, battery unit, battery pack and electricity utilization device

Publications (1)

Publication Number Publication Date
CN219843118U true CN219843118U (en) 2023-10-17

Family

ID=88302280

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202320904527.1U Active CN219843118U (en) 2023-04-14 2023-04-14 Current collecting disc, battery unit, battery pack and electricity utilization device

Country Status (1)

Country Link
CN (1) CN219843118U (en)

Similar Documents

Publication Publication Date Title
US20240128565A1 (en) Battery pack, vehicle, and energy storage device
KR101338275B1 (en) Battery Pack of Excellent Cooling Efficiency
EP2490278B1 (en) Cells spacer for battery module
WO2024000945A1 (en) End cover assembly, battery, battery module, battery pack and vehicle
JP7257531B2 (en) Battery cells, battery modules and automobiles
CN219843118U (en) Current collecting disc, battery unit, battery pack and electricity utilization device
CN220021521U (en) Current collecting disc, battery unit, battery pack and electricity utilization device
CN110492278B (en) Bus bar, battery module with bus bar, battery system and electric vehicle
CN220021520U (en) Battery monomer, battery pack and electricity utilization device
CN219832956U (en) Current collecting disc, battery unit, battery pack and electricity utilization device
CN220021522U (en) Pole core assembly, battery cell, battery pack and electricity utilization device
EP4160755A1 (en) Current collection plate and battery
CN220021524U (en) Current collecting disc, battery unit, battery pack and electricity utilization device
CN116666869A (en) Battery pack
CN220021523U (en) Battery monomer, battery pack and electricity utilization device
CN220066035U (en) Battery and battery device
CN219759829U (en) Battery device
CN218299844U (en) Battery with a battery cell
CN220774530U (en) Battery and battery pack
CN219759855U (en) Battery device
CN220796952U (en) Power battery shell and power battery
CN217009345U (en) Battery with a battery cell
CN220492127U (en) Current collecting disc and single battery
CN220021495U (en) Separator, cover plate assembly, battery cell, battery pack and electricity utilization device
CN220692160U (en) Current collecting cover plate of battery and battery

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant