Adapter piece, cover plate assembly, battery cell and adapter piece feeding device

Abstract

The utility model discloses an adapter plate, which is used for being electrically connected with an electrode terminal and a tab, and comprises a terminal connecting part, which is provided with a terminal connecting surface connected with the electrode terminal and a back surface deviating from the electrode terminal; the first tab connecting part and the second tab connecting part are connected to the two opposite sides of the terminal connecting part in the first direction, and the direction from one side of the two opposite sides to the other side is the first direction; wherein in a second direction pointing to the terminal connecting surface from the back surface, the first tab connecting surface of the first tab connecting part and the second tab connecting surface of the second tab connecting part are both higher than the back surface to form a tab accommodating space, and the tab accommodating space at least accommodates part of the tab. According to the utility model, the tab folding space is increased by the adapter plate. The utility model further provides a cover plate assembly, a battery cell and an adapter piece feeding device.

Description

TECHNICAL FIELD

[0001] The utility model relates to a switching piece, a cover plate assembly, an electric core and switching piece loading attachment. BACKGROUND

[0002] In the field of new energy power batteries, the application of secondary batteries is becoming more and more widespread, such as the application of secondary batteries (for example, lithium ion batteries) to vehicles, energy storage, mobile phones, tablet computers, wearable devices, mobile power sources, electronic cigarettes, digital products, power tools, power devices, energy storage devices and other electronic devices. However, the existing secondary batteries still need to be further improved in some aspects. SUMMARY

[0003] In view of the above problems, the utility model provides a switching piece, a cover plate assembly, an electric core at least can increase the folding tab space, the switching piece provided in the loading attachment of the switching piece is placed stably in the clip.

[0004] According to one aspect of the utility model, a switching piece is provided for electrically connecting with an electrode terminal and a tab, the switching piece comprising: a terminal connecting portion having a terminal connecting surface connected with the electrode terminal and a back surface facing away from the electrode terminal; a first tab connecting portion and a second tab connecting portion connected on opposite sides of the terminal connecting portion along a first direction; wherein along a second direction from the back surface to the terminal connecting surface, a first tab connecting surface of the first tab connecting portion and a second tab connecting surface of the second tab connecting portion are both higher than the back surface to form a tab accommodating space, and the tab accommodating space accommodates at least part of the tab.

[0005] In some embodiments, the height difference between the first tab connecting surface and the second tab connecting surface compared to the back surface is H, the thickness of the first tab connecting portion or the thickness of the second tab connecting portion is D, and H≤D.

[0006] In some embodiments, the first tab connecting portion and the second tab connecting portion are welded with the tab to form a welding mark, and the orthogonal projection of the welding mark on the first tab connecting surface is located within the area enclosed by the boundary line of the first tab connecting surface; the orthogonal projection of the welding mark on the second tab connecting surface is located within the area enclosed by the boundary line of the second tab connecting surface.

[0007] In some embodiments, along a third direction perpendicular to the first direction and the second direction, the first tab connecting portion has a first portion that exceeds the terminal connecting portion, and the second tab connecting portion has a second portion that exceeds the terminal connecting portion; along the first direction, the distance between the first portion and the second portion facing each other is greater than or equal to 0.2mm after subtracting the width of the terminal connecting portion.

[0008] In some embodiments, along the first direction, the distance between the first portion and the terminal connecting portion is ≥ 0.1mm, and the distance between the second portion and the terminal connecting portion is ≥ 0.1mm.

[0009] In some embodiments, the adapter tab is a monolithic piece.

[0010] In some embodiments, the first tab connecting portion, the second tab connecting portion, and the terminal connecting portion are flat plates parallel to each other.

[0011] According to another aspect of the present application, a cover plate assembly is provided, comprising: a cover plate body having a through hole; any adapter tab of the present application disposed on one side of the cover plate body; and an electrode terminal connected to the terminal connecting portion of the adapter tab and extending out of the through hole.

[0012] According to still another aspect of the present application, an electric core is provided, comprising: a housing; an electrode assembly and any adapter tab of the present application accommodated in the housing, wherein the electrode assembly has a first tab and a second tab of the same polarity, the first tab is welded to the first tab connecting portion of the adapter tab, and the second tab is welded to the second tab connecting portion of the adapter tab; and the first tab and the second tab are at least partially accommodated in the tab accommodating space of the adapter tab.

[0013] According to still another aspect of the present application, an adapter tab feeding device is provided, comprising a magazine and adapter tabs stacked in the magazine, the stacking direction being the thickness direction of the terminal connecting portion, the adapter tabs being any adapter tab of the present application, and the adapter tabs being mirror-symmetric structures. Along the stacking direction, in two adjacent adapter tabs above and below, the terminal connecting surface of the upper adapter tab faces in the opposite direction of the terminal connecting surface of the lower adapter tab, and along a vertical direction perpendicular to the stacking direction and the first direction, the terminal connecting surface of the upper adapter tab is spaced apart from the terminal connecting surface of the lower adapter tab side by side.

[0014] The beneficial effects of the technical scheme of the present application include:

[0015] The present application has a tab accommodating space to accommodate at least part of the tab, thereby increasing the tab folding space. In addition, the adapter tabs are stacked in the magazine to ensure that the adapter tabs can be placed stably. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained based on these drawings without creative labor.

[0017] Figure 1 A perspective view of the adapter piece according to an embodiment of the present application is shown.

[0018] Figure 2 A perspective view of the adapter piece according to an embodiment of the present application is shown. Figure 1 A perspective view of the adapter piece according to an embodiment of the present application is shown.

[0019] Figure 3 A perspective view of the adapter piece according to an embodiment of the present application is shown. Figure 1 A top view of the adapter piece shown in FIG.

[0020] Figure 4 A perspective view of the adapter piece according to an embodiment of the present application is shown. Figure 3 A cross-sectional view along the A-A line in FIG.

[0021] Figure 5 A perspective view of the cover plate assembly according to an embodiment of the present application is shown.

[0022] Figure 6 A top view of the cover plate assembly and a cross-sectional view along the C-C line in the top view are shown.

[0023] Figure 7 A perspective view of the adapter pieces stacked in the adapter piece loading device according to an embodiment of the present application is shown.

[0024] Figure 8 A top view of the adapter piece stack and a cross-sectional view along the B-B line in the top view are shown.

[0025] Figure 9 A perspective view of the adapter piece stack placed in the magazine is shown. DETAILED DESCRIPTION

[0026] In order to better understand the spirit of the embodiments of the present application, the embodiments of the present application will be further described in combination with some preferred embodiments of the present application.

[0027] Referring to Figures 1-3 Embodiments of the adapter piece 10 of the present application are described. Figure 1 and Figure 2 A perspective view of the adapter piece 10 according to an embodiment of the present application is shown, Figure 3 A top view of the adapter piece 10 shown in FIG. Figure 1 A top view of the adapter piece 10 shown in FIG. Figure 4 A top view of the adapter piece 10 shown in FIG. Figure 3A-A sectional view of the adapter tab 10. The adapter tab 10 is used in a secondary battery to electrically connect with the electrode terminal 42 and the tab. See Figure 1 and Figure 2 The adapter tab 10 includes a terminal connecting portion 11, and a first tab connecting portion 12 and a second tab connecting portion 13. The first tab connecting portion 12 and the second tab connecting portion 13 are connected on opposite sides of the terminal connecting portion 11 along a first direction Y from one side to the other side. In the case of two electrode assemblies stacked along the thickness direction of the electronic assembly, the tabs of one of the electrode assemblies are welded to the first tab connecting portion 12, and the tabs of the other electrode assembly are welded to the second tab connecting portion 13. At this time, the first direction Y is the same as the stacking direction of the two electrode assemblies.

[0028] Figure 2 The first tab connecting portion 12 is shown with a first tab connecting surface 121 for welding with the tab, and the second tab connecting portion 13 is shown with a second tab connecting surface 131 for welding with the tab, Figure 1 The terminal connecting portion 11 is shown with a terminal connecting surface 111 for electrically connecting with the electrode terminal 42. It can be seen that the terminal connecting surface 131 and the first tab connecting surface 121 are on opposite sides of the adapter tab 10, and the first tab connecting surface 121 and the second tab connecting surface 131 are on the same side of the adapter tab 10.

[0029] Continuing to refer to Figure 1 and Figure 2 Along a second direction Z from the back surface 112 to the terminal connecting surface 111, both the first tab connecting surface 121 and the second tab connecting surface 131 are higher than the back surface 112 to form a tab accommodating space that accommodates at least part of the bent and flattened tab. The adapter tab used in the prior art is planar and does not include a space for accommodating the tab of the electrode assembly. The tab accommodating space used in the present embodiment increases the space for bending the tab. In the case of the adapter tab 10 electrically connecting with the tabs of the electrode assembly, the second direction Z is the height direction of the electrode assembly.

[0030] Taking the example of the tabs of the two stacked electrode assemblies being connected with the adapter tab 10 as described above, referring to Figure 1 It can be seen that along the second direction Z, i.e. in the height direction of the electrode assembly, the first tab connecting portion 12 and the second tab connecting portion 13 are convex relative to the terminal connecting portion 11. This convexity causes the two tab connecting portions to be further away from the end of the electrode assembly where the tab is located, relative to the terminal connecting portion 11, in the height direction of the electrode assembly, thereby providing a larger space for bending the tab. The tab is welded to the corresponding tab connecting portion after being bent in the tab accommodating space.

[0031] Referring to Figure 2The solder print of the first tab connecting portion 12 is described. The first tab connecting portion 12 is soldered with the tab at the first tab connecting face 121, and the normal projection of the solder print formed by the soldering on the first tab connecting face 121 is located within the area enclosed by the boundary line of the first tab connecting face 121. For example, the first tab connecting portion 12 has a first portion 25B which extends beyond the terminal connecting portion 11, and the solder print is located at the area of the first portion 25B. Further reference is made to Figure 3 In the first direction Y, the width of the solder print of the first tab connecting portion 12 is smaller than the width L2 of the first portion 25B. The first portion 25B of the first tab connecting portion 12 extends beyond the terminal connecting portion 11 along a third direction X. The third direction X is perpendicular to the first direction Y and the second direction Z. The third direction X is also parallel to the terminal connecting face 111 and perpendicular to the first direction Y.

[0032] Similarly, reference is made to Figure 2 The solder print of the second tab connecting portion 13 is described. The second tab connecting portion 13 is soldered with the tab at the second tab connecting face 131, and the normal projection of the solder print formed by the soldering on the second tab connecting face 131 is located within the area enclosed by the boundary line of the second tab connecting face 131. For example, the second tab connecting portion 13 has a second portion 26B which extends beyond the terminal connecting portion 11 along the third direction X, and the solder print is located at the area of the second portion 26B. Further reference is made to Figure 3 In the first direction Y, the width of the solder print of the second tab connecting portion 13 is smaller than the width L1 of the second portion 26B.

[0033] Reference is made to Figure 3 and Figure 4 In the first direction Y, the first portion 25B and the second portion 26B face each other, and both are on the same side of the adapter tab 10. In the first direction Y, the distance between the first portion 25B and the second portion 26B is D1, and the width of the terminal connecting portion 11 is D2, D1-D2≥0.2mm. Reference is made to Figure 3 In the first direction Y, the distance between the first portion 25B and the terminal connecting portion 11 is D3, D3≥0.1mm; and the distance between the second portion 26B and the terminal connecting portion 11 is D4, D4≥0.1mm, and D3 and D4 can be the same or different.

[0034] It can be understood that although Figures 1-3 the first tab connecting portion 12 has the first portion 25B and the second tab connecting portion 13 has the second portion 26B, it is only an example, and it is obvious that there can be none, and it is not limited thereto.

[0035] In a preferred embodiment, the adapter tab 10 can be a monolithic piece. The first tab connecting portion 12, the second tab connecting portion 13, and the terminal connecting portion 11 are respectively flat plates parallel to each other.

[0036] The utility model also provides a cover plate assembly. Figure 5 A perspective view of the cover plate assembly 40 according to an embodiment of the utility model is shown, Figure 6 A top view and a cross-sectional view along the C-C line of the top view of the cover plate assembly 40 are shown. The cover plate assembly 40 includes the cover plate body 30, the adapter tab 10, and the electrode terminal 42. The adapter tab 10 is any one of the aforementioned adapter tabs of the utility model and has the lug accommodating space. The adapter tab 10 is arranged on one side of the cover plate body 30, and the electrode terminal 42 is connected to the terminal connecting portion 11 of the adapter tab 10 and extends out of the through hole of the cover plate body 10.

[0037] The utility model also provides an electric core. In an example, the electric core includes a shell, an electrode assembly, and the adapter tab 10, which is any one of the aforementioned adapter tabs of the utility model and has the lug accommodating space. The electrode assembly is accommodated in the shell, and the electrode assembly has the first lug and the second lug with the same polarity. The first lug is welded to the first lug connecting portion 12 of the adapter tab 10, the second lug is welded to the second lug connecting portion 13 of the adapter tab 10, and the first lug and the second lug are at least partially accommodated in the lug accommodating space of the adapter tab 10.

[0038] The utility model also provides an adapter tab feeding device. Figure 7 A perspective view of an adapter tab stacking group 50 in an adapter tab feeding device according to an embodiment of the utility model is shown, Figure 8 A top view and a cross-sectional view along the B-B line of the top view of the adapter tab stacking group 50 are shown, Figure 9 A perspective view of the adapter tab stacking group 50 placed in the clip 60 is shown. The adapter tab feeding device has the clip 60 and the adapter tabs 10 stacked in the clip 60, wherein the adapter tabs 10 are any one of the adapter tabs of the utility model and are mirror-symmetrical structures. The stacking direction of the adapter tabs 10 is the thickness direction of the terminal connecting portion 11. Along the stacking direction of the adapter tabs, in every two adapter tabs adjacent to each other in the up-down direction, the orientation of the terminal connecting surface of the upper adapter tab is opposite to the orientation of the terminal connecting surface of the lower adapter tab. For example, for the convenience of illustration, Figure 7 In the figure, two adapter tabs adjacent to each other in the up-down direction are marked, the upper adapter tab is marked as 10A, and the lower adapter tab is marked as 10B. The terminal connecting surface 111 of the upper adapter tab 10A faces upward, and the terminal connecting surface of the lower adapter tab 10B faces downward, and the orientations of the two surfaces along the stacking direction are opposite to each other. Figure 7 In the figure, the terminal connecting surface 111 of the upper adapter tab 10A and the back surface 112 of the terminal connecting surface of the lower adapter tab 10B can be seen, and the orientations of the two surfaces along the stacking direction are the same and both face upward.

[0039] For reference Figure 4 And Figure 8 , inFigure 4 In the second direction Z, the height difference between the first tab connecting surface 121 and the second tab connecting surface 131 compared to the back surface 112 is H, the thickness of the first tab connecting portion 12 and the thickness of any one of the second tab connecting portions 13 is D, H≤D, that is, the thickness of the first tab connecting portion 12 or the thickness of the second tab connecting portion 13 is greater than the height change caused by the bending of the adapter sheet 10, and the adapter sheets 10 stacked up and down contact each other at the tab connecting portion, which ensures that the stacked adapter sheets 10 can be laid flat. In the preferred embodiment, the thickness of the first tab connecting portion 12 and the thickness of the second tab connecting portion 13 are the same, and the thickness of the terminal connecting portion 11 is the same, that is, the thickness of the adapter sheet 10 as a whole is uniform.

[0040] Continuing to refer to Figure 7 The terminal connecting portion of the upper adapter sheet 10A and the terminal connecting portion of the lower adapter sheet 10B are spaced apart side by side along the vertical direction P. The vertical direction P is a vertical direction perpendicular to both the stacking direction of the adapter sheet and the first direction Y, and the first direction Y is the direction defined in the foregoing description of the adapter sheet. According to the stacked adapter sheet defined by the present application, the problem of abnormal feeding of the adapter sheet caused by the inability to lay flat in the clip 60 can be at least avoided.

[0041] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A tab for electrically connecting with an electrode terminal and a tab, characterized by, The adapter tab includes: a terminal connecting portion having a terminal connecting surface connected to the electrode terminal and a back surface facing away from the electrode terminal; a first tab connecting portion and a second tab connecting portion connected to opposite sides of the terminal connecting portion in a first direction, in a second direction pointing from the back surface to the terminal connecting surface, a first tab connecting surface of the first tab connecting portion and a second tab connecting surface of the second tab connecting portion are both higher than the back surface to form a tab accommodating space that accommodates at least part of the tab.

2. The adapter tab according to claim 1, wherein a height difference between the first tab connecting surface and the second tab connecting surface and the back surface is H, a thickness of the first tab connecting portion or a thickness of the second tab connecting portion is D, and H≤D.

3. The adapter tab according to claim 1, wherein a projection of a welding mark formed by welding the first tab connecting portion and the tab on the first tab connecting surface is located within an area enclosed by a boundary line of the first tab connecting surface; a projection of a welding mark formed by welding the second tab connecting portion and the tab on the second tab connecting surface is located within an area enclosed by a boundary line of the second tab connecting surface.

4. The adapter tab according to claim 1, wherein in a third direction perpendicular to the first direction and the second direction, the first tab connecting portion has a first portion that protrudes beyond the terminal connecting portion, and the second tab connecting portion has a second portion that protrudes beyond the terminal connecting portion, in the first direction, a distance between the first portion and the second portion facing each other minus a width of the terminal connecting portion is ≥0.2mm.

5. The adapter tab according to claim 4, wherein in the first direction, a distance between the first portion and the terminal connecting portion is ≥0.1mm, and a distance between the second portion and the terminal connecting portion is ≥0.1mm.

6. The adapter plate of claim 1, wherein, The adapter tab is a monolithic piece.

7. The adapter plate of claim 1, wherein, The first tab connecting portion, the second tab connecting portion, and the terminal connecting portion are flat plates parallel to each other.

8. A cover plate assembly characterized by, It includes: a cover plate body having a through hole; the adapter tab according to any one of claims 1 to 7 is arranged on one side of the cover plate body; an electrode terminal connected to the terminal connecting portion of the adapter tab and extending out of the through hole.

9. An electric cell characterized by It includes: a housing; an electrode assembly and the adapter tab according to any one of claims 1 to 7 accommodated in the housing, wherein the electrode assembly has a first tab and a second tab of the same polarity, the first tab is welded to the first tab connecting portion of the adapter tab, and the second tab is welded to the second tab connecting portion of the adapter tab; the first tab and the second tab are at least partially accommodated in the tab accommodating space of the adapter tab.

10. A device for feeding a tab, characterized in that it comprises: It includes a magazine and adapter tabs stacked in the magazine in a stacking direction that is a thickness direction of the terminal connecting portion, wherein the adapter tab is the adapter tab according to any one of claims 1 to 7, and the adapter tab has a mirror-symmetrical structure, In two of the upper and lower adjacent tab pieces along the stacking direction, the terminal connection surface of the upper tab piece is opposite to the terminal connection surface of the lower tab piece in the direction, In the vertical direction perpendicular to the stacking direction and the first direction, the terminal connection surface of the upper tab piece is spaced apart from the terminal connection surface of the lower tab piece side by side.

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