Tab, battery and electric equipment
By setting a through-hole receiving groove on the electrode conductor, embedding an insulating layer inside, and adding a protrusion on the inner wall of the groove, the problem of reduced battery energy density and safety caused by adhesive on the electrode surface is solved, achieving higher energy density and safety.
Patent Information
- Application Number
- CN202422995537.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-04
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2034-12-04
AI Technical Summary
In existing technologies, applying insulating adhesive to the surface of the electrode tabs reduces the energy density of the battery, and the insulating adhesive is prone to peeling off during collisions or drops, affecting battery safety.
Design an electrode tab with an insulating layer embedded in a through-hole on the conductor. The insulating layer does not protrude from the surface and is formed by spraying or deposition to enhance adhesion. Raised parts are added to the inner wall of the receiving groove to increase roughness and further enhance adhesion.
It improves the energy density and safety of the battery, reduces the risk of insulation layer peeling and deformation, and enhances welding quality and processing efficiency.
Smart Images
Figure CN223693328U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to battery technology field especially relates to a tab, battery and electric equipment. BACKGROUND
[0002] In some technologies, in order to avoid short circuit of tab and shell, insulating glue is pasted on the surface of tab, thereby avoiding electrical contact between tab and shell. Then, since the insulating glue is directly pasted on the surface of tab, it not only occupies extra internal space of battery, thereby reducing the energy density of battery, and since the insulating glue protrudes from the surface of tab, when the battery falls or collides, the edge of insulating glue is easy to scratch with the shell, thereby causing the edge of insulating glue to be raised, and even causing the insulating glue to fall off from the tab. SUMMARY
[0003] The utility model aims at at least one of the technical problems existing in prior art. To this end, the utility model provides a tab, which can be used in battery, can not only improve the energy density of battery, but also improve the safety of battery.
[0004] The utility model further provides a battery comprising the tab.
[0005] The utility model further provides an electric device comprising the battery.
[0006] According to the tab of the first aspect embodiment of the utility model, the tab comprises: a conductive body and an insulating layer;
[0007] Along the length direction of the tab, the conductive body comprises a first connecting part and a second connecting part arranged oppositely, the first connecting part is used for connecting with the battery cell, the second connecting part is used for connecting with the pole, the conductive body has a first surface, the first surface has a first accommodating groove along the width direction of the tab, the insulating layer is arranged in the first accommodating groove and does not protrude from the first surface.
[0008] According to the tab of the utility model embodiment, at least has the following beneficial effects:
[0009] In the embodiment, the insulating layer is arranged in the first accommodating groove and does not protrude from the first accommodating groove, so that the insulating layer does not occupy extra external space of tab, and since the insulating layer is located in the interior of the conductive body, it is not easy to be bumped, thereby reducing the risk of falling off or deforming of the insulating layer. Therefore, compared with the scheme of directly pasting glue on the surface of tab in the prior art, when the tab of the embodiment is used in battery, not only the energy density of battery can be improved, but also the safety of battery can be improved.
[0010] According to some embodiments of the present application, the tab has a set thickness, and along the thickness direction of the tab, the maximum size of the conductive body is i, and the size of the insulating layer is j, 2um≤j≤20% i.
[0011] According to some embodiments of the present application, along the length direction of the tab, the first accommodating groove has oppositely arranged first and second side walls, the conductive body also has a second surface opposite to the first surface, and along the direction from the first surface to the second surface, the distance between the first and second side walls gradually increases.
[0012] According to some embodiments of the present application, the insulating layer has a second edge close to the second connecting portion, and along the length direction of the tab, the size of the insulating layer is L1, the size of the edge of the second connecting portion away from the edge of the insulating layer is L2, and 15% < L1 / L2 < 80%.
[0013] According to some embodiments of the present application, the inner wall of the first accommodating groove has a plurality of protruding portions for increasing the roughness of the inner wall of the first accommodating groove.
[0014] The battery according to the second aspect of the present application comprises: a shell, a cell, a first pole, a second pole, a first tab and a second tab.
[0015] The shell has an accommodating cavity.
[0016] The cell is located in the accommodating cavity, and the cell comprises a first pole piece and a second pole piece.
[0017] The first pole is connected to the shell and electrically connected to the shell.
[0018] The second pole is connected to the shell and insulated between the shell.
[0019] The first tab has one end connected to the first pole piece and the other end electrically connected to the shell.
[0020] The second tab is the tab of the first aspect of the present application, the first connecting portion is electrically connected to the second pole piece, the second connecting portion is electrically connected to the second pole, the second tab is arranged between the cell and the second pole along the thickness direction of the second tab and forms a bending portion, and the insulating layer is located outside the bending portion.
[0021] The battery according to the present application has at least the following beneficial effects:
[0022] The insulating layer is arranged in the first accommodating groove and does not protrude from the first accommodating groove, so that the insulating layer does not need to occupy the external space of the tab, and the insulating layer is arranged in the internal part of the conductive body and is not easy to be knocked, so that the risk of falling off or deformation of the insulating layer is reduced.
[0023] According to some embodiments of the utility model, the shell includes a bottom shell and a top cover, the bottom shell has a second accommodating groove and a slot communicating with the second accommodating groove, the battery has a set thickness, the opening direction of the slot is along the thickness direction of the battery, the top cover is connected to the bottom shell and covers the slot to form the accommodating cavity, the battery has a set length, in the length direction of the battery, the bottom shell has a third side wall, the second pole passes through the third side wall, the second tab is arranged between the battery cell and the third side wall, and the top cover is located on one side of the first surface of the second tab.
[0024] According to some embodiments of the utility model, the bending part is arranged in the thickness direction of the battery.
[0025] According to some embodiments of the utility model, in the thickness direction of the battery, the bending part has a top part closest to the top cover, the gap between the top part and the top cover is a, the insulating layer has a first edge close to the first connecting part, the length of the insulating layer from the top part to the first edge is b, and b>a.
[0026] The electric device according to the third aspect of the utility model comprises the battery according to the second aspect of the utility model.
[0027] The electric device according to the utility model has at least the following beneficial effects:
[0028] The battery according to the first aspect of the utility model, wherein the insulating layer is arranged in the first accommodating groove and does not protrude from the first accommodating groove, so that the insulating layer does not need to occupy the external space of the tab, and the insulating layer is arranged in the internal part of the conductive body and is not easy to be knocked, so that the risk of falling off or deformation of the insulating layer is reduced.
[0029] Additional aspects and advantages of the utility model will be given in part in the following description, will become obvious in part from the following description, or will be understood by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS
[0030] The utility model will be further explained in connection with the drawings and embodiments, wherein:
[0031] Figure 1 It is structure schematic drawing of first kind of tab of first aspect embodiment of the utility model;
[0032] Figure 2 It is structure schematic drawing of first kind of tab of first aspect embodiment of the utility model; Figure 1 It is sectional view of the utility model.
[0033] Figure 3 It is sectional view of second kind of tab of first aspect embodiment of the utility model;
[0034] Figure 4 It is sectional view of third kind of tab of first aspect embodiment of the utility model;
[0035] Figure 5 It is structure schematic drawing of battery of second aspect embodiment of the utility model;
[0036] Figure 6 It is sectional view of the utility model. Figure 5
[0037] Reference signs:
[0038] Tab 1000;
[0039] Conductive body 100, first connecting portion 110, second connecting portion 120, first surface 130, first accommodating groove 140, first side wall 141, second side wall 142, second surface 150, protruding portion 160;
[0040] Insulating layer 200, first edge 210, second edge 220;
[0041] Shell 300, bottom shell 310, third side wall 311, top cover 320, accommodating cavity 330;
[0042] Battery cell 400, first pole piece 410, second pole piece 420;
[0043] First pole 500, second pole 600;
[0044] Bending portion 700, top portion 710. DETAILED DESCRIPTION
[0045] The embodiments of the utility model will be described in detail below, the examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and cannot be understood as limiting the utility model.
[0046] In the description of the utility model, it needs to be understood that, if the direction description, such as up, down, front, back, left, right and other directions or positional relationship indicated based on the direction or positional relationship shown in the drawing, is only for the convenience of describing the utility model and simplifying the description, and is not to indicate or imply that the device or element must have a particular orientation, configuration and operation, therefore, it cannot be understood as a limitation on the utility model.
[0047] In the description of the utility model, the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than and the like are understood as not including the number, above, below, within and the like are understood as including the number.If the first, second is described for the purpose of distinguishing technical features, it cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.
[0048] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installing and connecting should be understood broadly, and the person skilled in the art can determine the specific meaning of the above words in the utility model according to the specific content of the technical scheme.
[0049] In some technologies, in order to avoid short circuit caused by the contact between the tab and the shell, the surface of the tab is pasted with insulating glue, so as to avoid the electrical contact between the tab and the shell. Then, since the insulating glue is directly pasted on the surface of the tab, it not only occupies the internal space of the battery, thereby reducing the energy density of the battery, and since the insulating glue protrudes from the surface of the tab, when the battery falls or collides, the edge of the insulating glue is easy to scratch with the shell, which causes the edge of the insulating glue to be raised, and even causes the insulating glue to fall off from the tab.
[0050] In view of the above background, the utility model provides a tab 1000, which can be used in a battery, which not only can improve the energy density of the battery, but also can improve the safety of the battery. Figure 1 And Figure 2 , Figure 1 It is the structure diagram of the first tab of the first aspect embodiment of the utility model, Figure 2 It is Figure 1 The tab 1000 of the embodiment includes: a conductive body 100 and an insulating layer 200.
[0051] The conductive body 100, for example, is a copper sheet or an aluminum sheet, and includes a first connecting portion 110 and a second connecting portion 120 arranged opposite to each other along the length direction of the tab 1000. The first connecting portion 110 is configured to be connected to the electrode core 400, and the second connecting portion 120 is configured to be connected to the pole. The conductive body 100 has a first surface 130, and the first surface 130 has a first accommodating groove 140 extending through the tab 1000 along the width direction. The insulating layer 200 is arranged in the first accommodating groove 140. For example, the insulating layer 200 is an insulating adhesive arranged in the first accommodating groove 140, or is arranged in the first accommodating groove 140 by spraying or deposition, and does not protrude from the first surface 130.
[0052] Exemplarily, the tab 1000 of the present embodiment is used in a steel shell battery. The steel shell battery includes an outer shell 300, an electrode core 400, a positive pole and a negative pole. The outer shell 300 is a steel structure, and has an accommodating cavity 330. The electrode core 400 is, for example, a laminated electrode core 400 or a wound electrode core 400, and includes an anode sheet and a cathode sheet. The anode sheet is directly electrically connected to the outer shell 300. One end of the tab 1000 of the present embodiment is electrically connected to the cathode sheet, and the other end is electrically connected to the positive pole. The tab 1000 is arranged between the electrode core 400 and the positive pole by bending. The insulating layer 200 is arranged outside the tab 1000, so as to avoid the tab 1000 directly contacting the outer shell 300 and causing short circuit. Specifically, in the present embodiment, the insulating layer 200 is arranged in the first accommodating groove 140 and does not protrude from the first accommodating groove 140. Therefore, the insulating layer 200 does not need to occupy extra space outside the tab 1000, and is less likely to be knocked, so as to reduce the risk of the insulating layer 200 falling off or deforming. Therefore, compared with the scheme of directly pasting an adhesive on the surface of the tab 1000 in the prior art, the tab 1000 of the present embodiment can not only improve the energy density of the battery, but also improve the safety of the battery.
[0053] Reference Figure 2In some embodiments, the tab 1000 has a set thickness, and along the thickness direction of the tab 1000, the maximum size of the conductive body 100 is i, and the size of the insulating layer 200 is j, that is, the thickness of the conductive body 100 at a position where the first accommodating groove 140 is not arranged is i, the thickness of the insulating layer 200 is j, and 2 μm≤j≤20% i. Specifically, it can be understood that the thicker the insulating layer 200 is, the better the wear-resistant effect is, and the better the insulation performance is. However, the thicker the insulating layer 200 is, the deeper the first accommodating groove 140 is, which not only reduces the strength of the conductive body 100, but also reduces the current carrying capacity of the conductive body 100. Based on this, in the present embodiment, 2 μm≤j≤20% i, so that the thickness of the insulating layer 200 is within a suitable range, thereby ensuring that the conductive body 100 has sufficient strength and current carrying capacity on the premise of ensuring the insulation of the insulating layer 200.
[0054] With reference to Figure 3 , Figure 3 It is a sectional view of the second tab of the first aspect of the present application. In some embodiments, along the length direction of the tab 1000, the first accommodating groove 140 has oppositely arranged first and second side walls 141 and 142, and the conductive body 100 also has a second surface 150 opposite the first surface 130. Along the direction from the first surface 130 to the second surface 150, the distance between the first and second side walls 141 and 142 gradually increases, thereby forming an inverted V-shaped opening for the first and second side walls 141 and 142. Thus, the insulating layer 200 can be effectively limited in the accommodating groove, thereby reducing the risk of the insulating layer 200 falling off. Thus, when the tab 1000 of the present embodiment is used in a battery, the safety of the battery can be improved.
[0055] In some embodiments, the insulating layer 200 has a second edge 220 close to the second connecting portion 120, and along the length direction of the tab 1000, the size of the insulating layer 200 is L1, the size of the edge of the insulating layer 200 away from the second connecting portion 120 is L2, and 15% < L1 / L2 < 80%. Specifically, it can be understood that when the length of the tab 1000 is constant, the larger L1 is, the better the insulation effect of the tab 1000 is. However, the larger L1 is, the smaller L2 is, and too small L2 will result in insufficient welding area of the tab 1000 and affect the welding quality. Based on this, the present embodiment sets L1 and L2 within a suitable range, that is, 15% < L1 / L2 < 80%, thereby ensuring the welding quality of the tab on the premise of ensuring the insulation effect of the tab.
[0056] In some embodiments, the insulation layer 200 is formed by depositing an insulating material in the first accommodating groove 140. Specifically, compared with direct gluing, the deposition technique can form a very dense insulation layer 200 to improve the insulation of the insulation layer 200, and can generally make the adhesion of the insulation layer 200 to the inner wall of the first accommodating groove 140 stronger, so that the insulation layer 200 is not easy to fall off, thereby improving the safety of the battery. In some embodiments, the insulation layer 200 is formed by spraying an insulating material in the first accommodating groove 140. Specifically, compared with gluing, spraying has higher efficiency and can significantly improve the processing efficiency of the tab 1000 of the present embodiment. Moreover, the insulation layer 200 formed by spraying is more wear-resistant, which improves the service life of the insulation layer 200, thereby further improving the safety of the battery.
[0057] With reference to Figure 4 , Figure 4 is a sectional view of the third tab of the first aspect of the present application, in some embodiments, the inner wall of the first accommodating groove 140 has a plurality of protruding portions 160, for example, sawtooth stripes are machined on the inner wall of the first accommodating groove 140 by laser or machining process, etc. Processed to increase the roughness of the inner wall of the first accommodating groove 140, thereby improving the adhesion of the insulation layer 200 to the accommodating cavity 330, that is, by the plurality of protruding portions 160 to improve the connection strength between the insulation layer 200 and the conductor 100, thereby reducing the risk of the insulation layer 200 falling off, improving the safety of the battery.
[0058] With reference to Figure 5 and Figure 6 , Figure 4 is a sectional view of the third tab of the first aspect of the present application, Figure 5The utility model discloses a second aspect embodiment's battery's structure schematic diagram, the utility model discloses second aspect embodiment's battery, comprising: shell 300, electric core 400, first pole 500, second pole 600, first tab and second tab. Shell 300, shell 300 is for example aluminum shell or steel shell, shell 300 has accommodating cavity 330, and electric core 400 is located in accommodating cavity 330. Electric core 400 includes first pole piece 410 and second pole piece 420, and first pole 500 is connected to shell 300 and is electrically connected with shell 300, and second pole 600 is connected to shell 300 and is insulated between shell 300, and one end of first tab is connected to first pole piece 410, and the other end is electrically connected to shell 300. Second tab is the tab 1000 in first aspect embodiment, and first connecting portion 110 is electrically connected to second pole piece 420, and second connecting portion 120 is electrically connected to second pole 600, and second tab is bent along the thickness direction of itself and is arranged between electric core 400 and second pole 600 and forms bending part 700, and insulating layer 200 is located on the outside of bending part 700, thereby reducing the risk of contact between electric conductor 100 and the inner wall of accommodating cavity 330, and then avoiding the short circuit between second tab and shell 300, to improve the safety of battery.
[0059] For example, in some embodiments, shell 300 includes bottom shell 310 and top cover 320, bottom shell 310 has second accommodating groove, and the slot is communicated with second accommodating groove, the battery has the thickness of setting, the opening direction of slot is along the thickness direction of battery, top cover 320 is connected to bottom shell 310 and covers the slot and forms accommodating cavity 330, and the battery has the length of setting, in the length direction of battery, bottom shell 310 has third side wall 311, second pole 600 is arranged in third side wall 311, and second tab is bent and arranged between electric core 400 and third side wall 311, and top cover 320 is located on the side of the first surface of second tab. Specifically, in the assembling process, the second tab is inserted into the second accommodating groove, and the second tab is welded to the second pole of the third side wall, then the electric core 400 is inserted into the second accommodating groove, after the electric core 400 is inserted into the shell, the tab is arched towards the top cover, and the bending part 700 close to the top cover 320 is formed, and the insulating layer 200 is located outside the bending part 700, i.e. the top cover 320 is located on the side of the first surface 130 of the second tab. It can be known that in the use process, the bending part 700 is most likely to contact the top cover 320 due to impact or falling, therefore, in the embodiment, the insulating layer 200 is located on the outside of the bending part 700, thereby reducing the risk of contact between the second tab and the shell 300, to improve the safety of the battery.
[0060] Specifically, in the embodiment, the insulating layer 200 is arranged in the first accommodating groove 140 and does not protrude from the first accommodating groove 140, so that the insulating layer 200 not only does not occupy the space outside the tab 1000, but also is less likely to be damaged due to the arrangement of the insulating layer 200 inside the conductive body 100, thereby reducing the risk of falling off or deformation of the insulating layer 200. Thus, compared with the conventional technology of directly pasting glue on the surface of the tab 1000, the battery of the embodiment not only has a higher energy density, but also has higher safety.
[0061] It should be noted that, since the embodiment adopts all the technical features of the tab 1000 of the first aspect embodiment, the embodiment has all the beneficial effects brought by the first aspect embodiment, which will not be described here.
[0062] In some embodiments, the battery has a set thickness, and the bending part 700 is arranged apart from the top cover 320 along the thickness direction of the battery. Thus, the probability of contact between the insulating layer 200 arranged outside the bending part 700 and the top cover 320 is reduced, thereby reducing the risk of damage of the insulating layer 200 due to friction, improving the service life of the insulating layer 200, and improving the safety of the battery of the embodiment.
[0063] In some embodiments, along the thickness direction of the battery, the bending part 700 has a top part 710 closest to the top cover 320, the gap between the top part 710 and the top cover 320 is a, the insulating layer 200 has a first edge 210 close to the first connecting part 110, the length of the insulating layer 200 from the top part 710 to the first edge 210 is b, and b>a. Specifically, during the installation or falling of the battery cell 400, the battery cell 400 will move, thereby deforming the second tab. During the deformation of the second tab, the distance between the first edge 210 and the top cover 320 can change. Based on this, the length b of the first edge 210 to the top part 710 of the insulating layer 200 is greater than the gap a between the top part 710 and the top cover 320, so that when the second tab deforms and contacts the top cover 320, the insulating layer 200 can still contact the top cover 320, thereby avoiding the connection between the conductive body 100 and the top cover 320, and improving the safety of the battery.
[0064] The third aspect embodiment of the utility model discloses the power -driven equipment, and the power -driven equipment is for example mobile phone, watch or tablet computer and so on electronic equipment, can also be electric vehicle or oil-electric hybrid car and so on vehicle, and the power -driven equipment includes: the battery of the second aspect embodiment. Wherein the insulating layer 200 is arranged in the first accommodating groove 140, and does not protrude from the first accommodating groove 140, therefore the insulating layer 200 not only does not need to additionally occupy the external space of the pole lug 1000, and since the insulating layer 200 is located in the inside of the electrically conductive body 100, is not easy to knock, thereby reducing the risk of the insulating layer 200 falling off or deforming. Thus, compared with the scheme of directly pasting glue on the surface of the pole lug 1000 in the prior art, not only the energy density of the battery can be improved, but also the safety of the battery can be improved, and then the endurance and safety of the power -driven equipment can be improved.
[0065] It should be noted that the power -driven equipment of the embodiment has all the technical features of the second aspect embodiment, so the embodiment has all the beneficial effects brought by the second aspect embodiment.
[0066] The utility model embodiment has been explained in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiment, and within the knowledge range possessed by ordinary skilled in the art, various changes can be made without departing from the purpose of the utility model. In addition, in the description of the utility model, the description of reference terms "an embodiment", "some embodiments", "illustrative embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are contained in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above-mentioned terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable way.
Claims
1. A tab, characterized in that The conductive body includes a first connecting portion and a second connecting portion arranged opposite to each other along the length direction of the tab, the first connecting portion is used for connecting with the battery cell, and the second connecting portion is used for connecting with the pole. The insulating layer is arranged in the first accommodating groove and does not protrude from the first surface. The tab has a set thickness, and along the thickness direction of the tab, the maximum size of the conductive body is i, the size of the insulating layer is j, and 2 μm≤j≤20% i.
2. The tab of claim 1, wherein Along the length direction of the tab, the first accommodating groove has a first side wall and a second side wall arranged opposite to each other, the conductive body further has a second surface opposite to the first surface, and along the direction from the first surface to the second surface, the distance between the first side wall and the second side wall gradually increases.
3. The tab of claim 1, wherein The insulating layer has a second edge close to the second connecting portion, along the length direction of the tab, the size of the insulating layer is L1, the size of the second edge to the edge of the second connecting portion away from the insulating layer is L2, and 15% < L1 / L2 < 80%.
4. The tab of claim 1, wherein The inner wall of the first accommodating groove has a plurality of protrusions for increasing the roughness of the inner wall of the first accommodating groove.
5. The tab of claim 4, wherein, The shell has an accommodating cavity.
6. A battery characterized by The battery cell includes a first pole piece and a second pole piece. The first pole is connected to the shell and electrically connected with the shell. The second pole is connected to the shell and insulated from the shell. The first tab has one end connected to the first pole piece and the other end electrically connected to the shell. The second tab is the tab of any one of claims 1 to 5, the first connecting portion is electrically connected to the second pole piece, the second connecting portion is electrically connected to the second pole, the second tab is arranged between the battery cell and the second pole along the thickness direction of the second tab, and forms a bending portion, and the insulating layer is located outside the bending portion. The shell includes a bottom shell and a top cover, the bottom shell has a second accommodating groove and a slot communicating with the second accommodating groove, the battery has a set thickness, the opening direction of the slot is along the thickness direction of the battery, the top cover is connected to the bottom shell and covers the slot to form the accommodating cavity, the battery has a set length, along the length direction of the battery, the bottom shell has a third side wall, the second pole passes through the third side wall, the second tab is arranged between the battery cell and the third side wall, and the top cover is located on one side of the first surface of the second tab. Along the thickness direction of the battery, the bending portion is arranged apart from the top cover.
7. The battery of claim 6, wherein, Along the thickness direction of the battery, the bending portion has a top portion closest to the top cover, the gap between the top portion and the top cover is a, the insulating layer has a first edge close to the first connecting portion, and the length of the insulating layer from the top portion to the first edge is b, and b>a.
8. The battery of claim 7, wherein, 9. The battery of claim 8, wherein, 10. An electrical device, characterized by A battery comprising any one of claims 6 to 9.