Lithium battery pole piece and lithium battery cell

Abstract

The utility model provides a kind of lithium battery pole piece and lithium battery core, lithium battery pole piece includes empty foil and the active material layer coated in empty foil two sides, with tab slot for installing tab piece on one side active material layer, the active material layer on the other side has the avoidance slot corresponding with tab slot, the bottom of tab slot and avoidance slot is respectively two sides of empty foil, lithium battery pole piece further include the support structure being arranged in tab slot and avoidance slot, the support structure in tab slot and corresponding avoidance slot respectively from two sides of empty foil and stop empty foil.Using the scheme, the abutment limit of empty foil exposed from two sides of two sides of empty foil is realized by support structure, to avoid after opening tab slot and avoidance slot, empty foil is exposed to float or only one side is abutted and limited, resulting in low structural strength of empty foil at slot, prone to deformation due to other factors, etc.Lead to lithium battery pole piece failure or performance reduction, conducive to improve the reliability and stability of lithium battery pole piece after slotting.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a lithium battery electrode and a lithium battery cell. Background Technology

[0002] A lithium-ion battery cell is a common core component of a battery, mainly composed of a positive electrode, a negative electrode, and a separator. The separator is located between the positive and negative electrode. The positive and negative electrode typically include tabs, current collectors, and a coating attached to the current collector. The uncoated areas on the current collector are used to form empty foil areas for mounting the tabs (usually including opposing tab grooves and clearance grooves).

[0003] In particular, the empty foil in the empty foil area will be exposed. When the exposed empty foil is installed or used, it is prone to deformation due to environmental factors or usage factors, which may affect the performance of the lithium battery electrode. Utility Model Content

[0004] This invention provides a lithium battery electrode and a lithium battery cell to solve the problem of poor structural strength at the exposed foil area after the electrode tab groove and corresponding clearance groove are opened on the lithium battery electrode.

[0005] To address the aforementioned problems, according to one aspect of this utility model, a lithium battery electrode sheet is provided. The lithium battery electrode sheet includes an empty foil and active material layers coated on both sides of the empty foil. One side of the active material layer has a tab groove for mounting a tab, and the other side of the active material layer has a relief groove corresponding to the tab groove. The bottoms of the tab groove and the relief groove are respectively the two sides of the empty foil. The lithium battery electrode sheet also includes a support structure disposed in the tab groove and the relief groove. The support structure in the tab groove and the corresponding relief groove abuts against the empty foil from both sides of the empty foil.

[0006] Furthermore, the support structure has an abutting surface for abutting the empty foil. For a support structure on one side where the empty foil is provided, if there is only one abutting surface, the abutting surface abuts at least the central region of the exposed area of ​​the empty foil; if there are multiple abutting surfaces, the multiple abutting surfaces are circumferentially symmetrically distributed with the center line of the exposed area of ​​the empty foil as the axis of symmetry, and / or at least some of the abutting surfaces are the same.

[0007] Furthermore, the projections of the contact surface on one side of the empty foil and the contact surface on the other side of the empty foil are at least partially aligned on the empty foil.

[0008] Furthermore, the projection interval between the contact surface on one side of the empty foil and the contact surface on the other side of the empty foil is [missing information].

[0009] Furthermore, the support structure includes insulating adhesive paper disposed at the tab groove and / or the clearance groove; the support structure includes an abutting protrusion disposed between the insulating adhesive paper and the empty foil and used to abut against one side of the empty foil, the abutting protrusion having at least one abutting surface on the side facing the empty foil, the insulating adhesive paper and the abutting protrusion being separately disposed or integrally formed.

[0010] Furthermore, the support structure also includes an insulating support layer injection molded at the tab groove and / or the clearance groove; both the tab groove and the clearance groove are provided with abutting protrusions of insulating adhesive paper; or, one of the tab groove and the clearance groove is provided with abutting protrusions of insulating adhesive paper, and the other is filled with an insulating support layer that contacts the empty foil.

[0011] Furthermore, if one of the tab groove and the clearance groove is provided with an abutting protrusion of insulating adhesive paper, and the other is filled with an insulating support layer that contacts the empty foil, then the tab groove is provided with an abutting protrusion of insulating adhesive paper, and the clearance groove is filled with an insulating support layer that contacts the empty foil.

[0012] Furthermore, the insulating adhesive paper includes an interconnected bonding section and a transition section. The bonding section is located outside the tab groove or clearance groove and is bonded to the surface of the active material layer. The transition section extends into the tab groove or clearance groove. The support structure is separately connected to the insulating adhesive paper. The abutment protrusion is provided on the side of the bonding section or transition section facing the empty foil.

[0013] Furthermore, the material abutting the protrusion is a porous material, which includes carbonaceous materials with high specific surface area and binders. The carbonaceous materials include SP / acetylene black / Kejtien black / activated carbon, and the binders include PVDF / CMC / PAA.

[0014] Furthermore, the lithium battery electrode also includes a tab part partially disposed in the tab groove, a support structure disposed in the tab groove having the tab part abutting against the empty foil, and / or, a support structure disposed in the tab groove having the tab part abutting against the tab part.

[0015] According to one aspect of the present invention, the present invention provides a lithium battery cell, the lithium battery cell including a separator and the aforementioned lithium battery electrodes, the lithium battery electrodes and the separator being stacked, bent or wound to form the lithium battery cell, and the tabs of the lithium battery electrodes being located in the middle region of the lithium battery cell.

[0016] The present invention provides a lithium battery electrode sheet, which includes an empty foil and active material layers coated on both sides of the empty foil. One side of the active material layer has a tab groove for mounting a tab, and the other side of the active material layer has a relief groove corresponding to the tab groove. The bottoms of the tab groove and the relief groove are the two sides of the empty foil, respectively. The lithium battery electrode sheet also includes a support structure disposed in the tab groove and the corresponding relief groove. The support structure in the tab groove and the relief groove abuts against the empty foil from both sides of the empty foil.

[0017] This solution utilizes support structures on both sides of the empty foil to abut and limit the exposed empty foil from both sides after slotting. This prevents the empty foil from being exposed and floating in the air after slotting the tabs and clearance slots, or from being abutted and limited on only one side. This avoids situations where the empty foil has low structural strength at the slotting point and is prone to deformation due to other factors, leading to lithium battery electrode failure or performance degradation. This solution is beneficial for improving the reliability and stability of lithium battery electrodes after slotting. Attached Figure Description

[0018] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model and do not constitute an undue limitation thereof. In the drawings:

[0019] Figure 1 A schematic diagram of the structure of the lithium battery electrode provided in Embodiment 1 of this utility model is shown;

[0020] Figure 2 A schematic diagram of the structure of the lithium battery electrode provided in Embodiment 2 of this utility model is shown;

[0021] Figure 3 A schematic diagram of the structure of the lithium battery electrode provided in Embodiment 3 of this utility model is shown.

[0022] The above figures include the following reference numerals:

[0023] 10. Lithium battery electrode sheet; 11. Empty foil; 12. Active material layer; 121. Tab groove; 122. Clearance groove; 13. Insulating adhesive tape; 131. Adhesive section; 132. Adapter section; 14. Insulating support layer; 15. Tab component; 16. Support structure; 1601. Abutting surface; 161. Abutting protrusion. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0025] like Figures 1 to 3 As shown, an embodiment of the present invention provides a lithium battery electrode 10, which includes a hollow foil 11 and an active material layer 12 coated on both sides of the hollow foil 11. One side of the active material layer 12 has a tab groove 121 for mounting tabs, and the other side of the active material layer 12 has a relief groove 122 corresponding to the tab groove 121. The bottoms of the tab groove 121 and the relief groove 122 are the two sides of the hollow foil 11, respectively. The lithium battery electrode also includes a support structure 16 disposed in the tab groove 121 and the relief groove 122. The support structure 16 in the tab groove 121 and the corresponding relief groove 122 abut against the hollow foil 11 from both sides.

[0026] In this embodiment, the support structures 16 on both sides of the empty foil 11 provide abutment and restraint to the exposed empty foil 11 from both sides. This avoids the empty foil 11 from being exposed and floating in the air after the tab groove 121 and the clearance groove 122 are opened, or from only one side being abutted and restrained, which would result in low structural strength of the empty foil 11 at the groove. The exposed empty foil 11 is also prone to deformation due to other factors, which could lead to failure or performance reduction of the lithium battery electrode 10. This is beneficial to improving the structural strength, reliability and stability of the lithium battery electrode 10 after the groove is opened.

[0027] The contact surface 1601 can directly or indirectly abut against the empty foil 11. The selection, design, quantity, and shape of the contact surface 1601 can be adaptively adjusted according to the actual situation.

[0028] Specifically, the support structure 16 includes insulating adhesive paper 13 disposed at the tab groove 121 and / or the clearance groove 122; the support structure 16 includes an abutment protrusion 161 disposed between the insulating adhesive paper 13 and the empty foil 11 and used to abut against one side of the empty foil 11, the abutment protrusion 161 having at least one abutment surface 1601 on the side facing the empty foil 11, the insulating adhesive paper 13 and the abutment protrusion 161 being separately disposed or integrally formed. This arrangement facilitates the design and installation of the abutment protrusion 161, and helps to ensure the reliability and stability of the abutment protrusion 161 abutting against the empty foil 11. Preferably, in this embodiment, the insulating adhesive paper 13 and the abutment protrusion 161 are separately disposed, which facilitates the disassembly, replacement and other operations of the abutment protrusion 161. Furthermore, the support structure 16 also includes an insulating support layer 14 injection-molded in the tab groove 121 and / or the clearance groove 122; insulating adhesive paper 13 abutting the protrusion 161 is bonded to both the tab groove 121 and the clearance groove 122; or, one of the tab groove 121 and the clearance groove 122 has insulating adhesive paper 13 abutting the protrusion 161 bonded to it, and the other is internally filled with an insulating support layer 14 that contacts the empty foil 11. Figure 1 In the first embodiment shown, insulating adhesive paper 13 with abutment protrusions 161 is bonded to both the tab groove 121 and the clearance groove 122. The abutment protrusions 161 on both sides are designed independently of the insulating adhesive paper 13 (separately set). The abutment protrusions 161 on both sides of the empty foil 11 abut against the empty foil 11 from both sides; as shown Figure 2 The second embodiment shown and Figure 3 In the third embodiment shown, an insulating adhesive paper 13 with an abutment protrusion 161 is bonded to the tab groove 121. The clearance groove 122 is filled with an insulating support layer 14 that contacts the empty foil 11. The abutment protrusion on one side of the tab groove 121 is designed independently of the insulating adhesive paper 13 (separately set). The insulating support layer 14 inside one side of the clearance groove 122 serves as both a support structure 16 and an insulating structure. The insulating support layer 14 and the abutment protrusion 161 on one side of the insulating adhesive paper 13 abut against the empty foil 11 from both sides. This arrangement allows for adaptive selection of the insulating layer at the tab groove 121 and the corresponding clearance groove 122, and also facilitates adaptive design of the formation of the support structure 16 at the selected insulating layer.

[0029] It is understandable that the design and selection of insulating tape 13 at the tab groove 121 and the clearance groove 122, as well as the support structure 16, can be adapted to the actual situation, and will not be listed one by one here.

[0030] Specifically, the support structure 16 has an abutting surface 1601 for abutting the empty foil 11. For a support structure 16 on one side of the empty foil 11, when there is only one abutting surface 1601, the abutting surface 1601 at least abuts the center area of ​​the exposed area of ​​the empty foil 11. This arrangement ensures the reliability and effectiveness of the abutting surface 1601 abutting the exposed empty foil 11. On the other hand, when there are multiple abutting surfaces 1601, the multiple abutting surfaces 1601 are symmetrically distributed circumferentially with the center line of the exposed area of ​​the empty foil 11 as the axis of symmetry, and / or at least some of the abutting surfaces 1601 are the same. This arrangement helps to ensure the uniformity and stability of the multiple abutting surfaces 1601 abutting the empty foil. In this embodiment, the multiple abutting surfaces 1601 are all formed on the support structure 16.

[0031] exist Figure 1 The first embodiment shown and Figure 2 In the second embodiment shown, the multiple contact surfaces 1601 on one side of the tab groove 121 are identical, and the multiple contact surfaces 1601 are symmetrically distributed about the center line of the exposed area of ​​the empty foil 11; Figure 3 In the third embodiment shown, there is one contact surface 1601, and the center line of the exposed area of ​​the empty foil 11 is located on the symmetry plane of the contact surface 1601.

[0032] It should be noted that in other embodiments not shown in the figures, the multiple abutment surfaces 1601 may be partially symmetrically distributed or not completely symmetrically distributed, and may not all be the same or may be different in pairs. The area and distribution of the multiple abutment surfaces 1601 can be structurally reinforced according to the different positions of the exposed area of ​​the empty foil. That is, the distribution and design of the multiple abutment surfaces 1601 can be adaptively designed according to the actual situation, and will not be listed in detail here.

[0033] Optionally, the area and shape of the contact surface 1601 can be adapted to the actual situation to ensure the holding effect on the empty foil 11. The shape of the contact surface 1601 is preferably circular or a rectangular surface that matches the rectangular tab groove 121 and the rectangular clearance groove 122.

[0034] Specifically, in this embodiment, the insulating tape 13 and the abutting protrusion 161 are separately provided, and the insulating support layer 14 can serve as both the support structure 16 and the insulating structure.

[0035] When the insulating adhesive paper 13 with abutment protrusions 161 has multiple abutment surfaces 1601, multiple abutment protrusions 161 are correspondingly provided, and multiple abutment surfaces 1601 are formed one-to-one with each of the multiple abutment protrusions 161 facing the empty foil 11, and at least some of the abutment protrusions 161 are the same. This arrangement allows the operator to adaptively adjust the number of abutment protrusions 161 according to the actual situation, thereby adjusting the abutment surfaces 1601 to ensure the abutment effect on the empty foil 11.

[0036] Preferably, the projections of the contact surface 1601 on one side of the empty foil 11 and the contact surface 1601 on the other side of the empty foil 11 are at least partially aligned on the empty foil 11.

[0037] In such Figure 1 In the first embodiment shown, insulating tape 13 with abutment protrusions 161 is bonded to both the tab groove 121 and the corresponding clearance groove 122. The abutment protrusions 161 inside both are independent of the insulating tape 13. Each of the two opposing insulating tapes 13 has two abutment protrusions 161 connected inside. The abutment surfaces 1601 of the two abutment protrusions 161 on one side are directly opposite to the abutment surfaces 1601 of the two abutment protrusions 161 on the other side and their projections completely overlap, further ensuring the reliability and stability of the abutment against the empty foil 11.

[0038] In another embodiment of the utility model (not shown), the projected portions of the abutment surface 1601 on one side of the empty foil 11 and the abutment surface 1601 on the other side of the empty foil 11 are directly opposite each other. For example, two abutment protrusions 161 are still provided on each side, but the areas of the abutment surfaces 1601 on the two sides are different and / or the projections are staggered. It is understood that the area, number, etc. of the abutment surfaces 1601 in this embodiment can be adaptively adjusted according to the actual situation, and will not be listed in detail here.

[0039] In another embodiment of this invention (not shown in the figures), the projections of the contact surface 1601 on one side of the empty foil 11 and the contact surface 1601 on the other side of the empty foil 11 are spaced apart. This arrangement helps to ensure the uniformity of contact with the empty foil 11, thereby increasing the reliability and stability of the contact with the empty foil 11.

[0040] Among them, such as Figures 1 to 3 As shown, the lithium battery electrode 10 also includes a tab 15 partially disposed within the tab groove 121. An abutting protrusion 161 disposed within the tab groove 121 with the tab 15 abuts against the empty foil 11, and / or, the abutting protrusion 161 disposed within the tab groove 121 with the tab 15 abuts against the tab 15. In such a way... Figure 1 Example 1 shown Figure 2 The second embodiment shown and Figure 3In the third embodiment shown, the two abutting surfaces 1601 of the abutting protrusion 161 on the inner side of the insulating adhesive paper 13 located in the tab groove 121 abut against the tab 15 to achieve indirect abutment against one side of the empty foil 11. The insulating support layer 14 has an abutting surface 1601 that directly abuts against the other side of the empty foil 11.

[0041] In another embodiment of this utility model (not shown), the abutting surfaces 1601 of the abutting protrusions 161 located inside the insulating adhesive paper 13 within the tab groove 121 are in two sets. One set abuts against the empty foil 11, and the other set abuts against the tab 15. This arrangement further ensures the reliability and stability of the abutment against the empty foil 11. Alternatively, in yet another embodiment of this utility model (not shown), the abutting surfaces 1601 of the abutting protrusions 161 located inside the insulating adhesive paper 13 within the tab groove 121 all directly abut against the empty foil 11. This arrangement helps to reduce potential damage to the tab 15 caused by the abutting protrusions 161, thus ensuring the reliability of the tab 15.

[0042] It is understood that the total projected area of ​​the contact surface 1601 on the empty foil 11 exposed at the bottom of the tab groove 121 or the clearance groove 122 is less than or equal to the area of ​​the empty foil 11 exposed at the bottom of the tab groove 121 or the clearance groove 122; or, the total projected area of ​​the contact surface 1601 on the empty foil 11 exposed at the bottom of the tab groove 121 or the clearance groove 122 is less than or equal to the area of ​​the tab 15.

[0043] It should be noted that for multiple abutting protrusions 161 set in the same groove (ear groove 121 or clearance groove 122), the abutting protrusions 161 with abutting positions on the same plane are the same, and / or the abutting protrusions 161 with abutting positions on different planes have the same structure and shape as the abutting surface 1601.

[0044] exist Figure 1 In the first embodiment shown, and Figure 2 In the second embodiment shown, both the tab groove 121 and the opposite clearance groove 122 are provided with two abutting protrusions 161. The two abutting protrusions 161 abut at the same position and have the same shape and abutting area (shape and area of ​​the abutting surface 1601). In another embodiment of this utility model (not shown), the shape and abutting area of ​​the different abutting protrusions 161 may not be exactly the same or may be completely different, and the structure can be reinforced according to the different positions of the exposed area of ​​the empty foil.

[0045] Preferably, the abutting protrusion 161 is not limited to the cylindrical or rectangular block in this embodiment. Its dimensions in the extension length direction can be gradually designed, such as being thicker in the middle and thinner at both ends, so as to increase the structural strength of the abutting protrusion 161 while ensuring a small area of ​​contact. The specific setting of the support structure 16 can be adaptively adjusted according to the actual situation, and will not be listed one by one here.

[0046] Furthermore, the insulating adhesive tape 13 includes an adhesive section 131 and a transition section 132 connected to each other. The adhesive section 131 is located outside the tab groove 121 or the clearance groove 122 and is bonded to the surface of the active material layer 12. The transition section 132 extends into the tab groove 121 or the clearance groove 122, and the abutment protrusion 161 is provided on the side of the adhesive section 131 or the transition section 132 facing the empty foil 11.

[0047] By setting the transition section 132, the length of the abutment protrusion 161 is reduced while achieving the transition of the abutment protrusion 161. This can avoid the situation where the adhesive section 131 may be deformed or damaged under the action of the abutment protrusion 161 when the abutment protrusion 161 is directly set on the adhesive section 131. At the same time, it can avoid the situation where the abutment protrusion 161 needs to be long enough to abut one side of the empty foil 11, thereby improving the structural strength and reliability of the insulating adhesive paper 13.

[0048] Optionally, the bonding section 131, the transition section 132, and the abutment protrusion 161 can be connected by a mechanical structure, by bonding, or by integral processing, or by other detachable connection methods, which will not be listed here.

[0049] In this embodiment, the material of the abutment protrusion 161 is a porous material, which includes a carbon-based material with a high specific surface area and a binder. The carbon-based material includes SP (spandex or polyurethane fiber) / acetylene black / Kejtien black / activated carbon, and the binder includes PVDF (polyvinylidene fluoride) / CMC (carboxymethyl cellulose) / PAA (polyacrylic acid). This configuration allows the abutment protrusion 161 to absorb and continuously release the injected electrolyte during the cycling process of the lithium battery cell in which the lithium battery electrode 10 is applied. The electrolyte is then replenished in the active material through capillary action, improving the cycle capacity retention rate of the lithium battery cell, especially significantly improving high-temperature cycling performance.

[0050] Preferably, the percentage of binder and carbonaceous material in the porous material formulation is greater than 0 and less than or equal to 10%.

[0051] Preferably, the support structure 16 (especially the abutment protrusion 161) is flexible and can be bent and deformed as the lithium battery electrode 10 is bent.

[0052] Preferably, insulating tape 13 is adhered to the tab groove 121. The tab groove 121 has a first groove segment and a second groove segment that are interconnected. The bottom wall of the first groove segment is the surface of the empty foil 11. The second groove segment is larger than the first groove segment. The insulating tape 13 is adhered to the first groove segment and its surface is flush with the surface of the active material layer 12. Alternatively, insulating tape 13 is adhered to the clearance groove 122. The clearance groove 122 has a third groove segment and a fourth groove segment. The bottom wall of the third groove segment is the surface of the empty foil 11. The fourth groove segment is larger than the third groove segment. The insulating tape 13 is adhered to the third groove segment and its surface is flush with the surface of the active material layer 12. This arrangement facilitates the positioning and installation of the insulating tape 13. Pre-positioning of the insulating tape 13 can be achieved through the transition between the groove segment and the transition segment 132, avoiding excessive installation offset and improving the reliability of the installation of the insulating tape 13 and the accuracy of the installation of the abutment protrusion 161.

[0053] Another embodiment of the present invention (not shown in the figure) provides a lithium battery cell, which includes a separator and the aforementioned lithium battery electrode 10. The lithium battery electrode 10 and the separator are stacked, bent or wound to form the lithium battery cell, and the tab of the lithium battery electrode 10 is located in the middle region of the lithium battery cell.

[0054] Compared to the conventional structure where the tabs are located at one end of the lithium battery electrode 10, the centrally positioned tab design in this embodiment reduces the battery's internal resistance. In this centrally positioned structure, electrons diffuse from the center of the tabs to both ends, shortening the current path and reducing the battery's internal resistance. Furthermore, with the tabs centrally positioned, its rate performance is close to that of batteries using a stacked process. The performance difference is not significant at low discharge rates, but its advantages are evident at high discharge rates, supporting larger charge and discharge currents, enabling fast charging and high-power discharge, meeting the needs of some high-rate electrical devices. Moreover, due to the reduced internal resistance, less heat is generated during high-rate charging and discharging, resulting in a smaller temperature rise and improved battery safety and lifespan. On the other hand, this relatively regular structure means that when the battery is subjected to external impact, the tabs are in the middle, resulting in better stress distribution. Compared to structures with tabs on one side, the centrally positioned tab structure is more stable and less prone to short circuits, fires, or other problems caused by deformation or displacement, reducing the risk of cell bulging, combustion, or even explosion. Furthermore, the center-placed tab method can effectively reduce the area of ​​the empty foil region at the tab welding point, thereby effectively improving the energy density of the battery.

[0055] In summary, this utility model provides a lithium battery electrode and a lithium battery cell. The performance of the lithium battery cell is improved by the central placement of the tabs. The support structures 16 on both sides of the empty foil 11 provide abutment and restraint to the exposed empty foil 11 from both sides. This avoids the situation where the empty foil 11 is exposed and floating after the tab grooves 121 and the clearance grooves 122 are opened, or only one side is abutted and restrained, resulting in low structural strength of the empty foil 11 at the groove. The exposed empty foil 11 may be deformed due to other factors, which may lead to failure or performance reduction of the lithium battery electrode 10. This improves the structural strength of the empty foil 11 after the groove is opened and ensures the reliability and stability of the lithium battery electrode 10 and the lithium battery cell.

[0056] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0057] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0058] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0059] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0060] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0061] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A lithium battery electrode, the lithium battery electrode comprising an empty foil (11) and an active material layer (12) coated on both sides of the empty foil (11), wherein one side of the active material layer (12) has a tab groove (121) for mounting a tab, and the other side of the active material layer (12) has a relief groove (122) corresponding to the tab groove (121), the bottoms of the tab groove (121) and the relief groove (122) being the two sides of the empty foil (11), characterized in that, The lithium battery electrode also includes a support structure (16) disposed in the tab groove (121) and the clearance groove (122), wherein the support structure (16) in the tab groove (121) and the corresponding clearance groove (122) respectively abuts against the empty foil (11) from both sides.

2. The lithium battery electrode according to claim 1, characterized in that, The support structure (16) has an abutting surface (1601) for abutting the empty foil (11), for the support structure (16) on one side of the empty foil (11). When there is only one contact surface (1601), the contact surface (1601) at least abuts against the center region of the exposed area of ​​the empty foil (11); When there are multiple abutting surfaces (1601), the multiple abutting surfaces (1601) are symmetrically distributed circumferentially with the center line of the exposed area of ​​the empty foil (11) as the axis of symmetry, and / or at least some of the abutting surfaces (1601) are the same.

3. The lithium battery electrode according to claim 2, characterized in that, The projection of the contact surface (1601) on one side of the empty foil (11) and the contact surface (1601) on the other side of the empty foil (11) onto the empty foil (11) are at least partially aligned.

4. The lithium battery electrode according to claim 2, characterized in that, The projection interval between the contact surface (1601) on one side of the empty foil (11) and the contact surface (1601) on the other side of the empty foil (11) on the empty foil (11).

5. The lithium battery electrode according to claim 1, characterized in that, The support structure (16) includes insulating tape (13) disposed at the tab groove (121) and / or the clearance groove (122). The support structure (16) includes an abutting protrusion (161) disposed between the insulating adhesive paper (13) and the empty foil (11) and used to abut against one side of the empty foil (11). The abutting protrusion (161) has at least one abutting surface (1601) on the side facing the empty foil (11). The insulating adhesive paper (13) and the abutting protrusion (161) are separately disposed or integrally formed.

6. The lithium battery electrode according to claim 5, characterized in that, The support structure (16) further includes an insulating support layer (14) injection molded at the tab groove (121) and / or the clearance groove (122). The insulating adhesive paper (13) with the abutment protrusion (161) is bonded to both the tab groove (121) and the clearance groove (122); or, the insulating adhesive paper (13) with the abutment protrusion (161) is bonded to one of the tab groove (121) and the clearance groove (122), and the other is filled with the insulating support layer (14) that contacts the empty foil (11).

7. The lithium battery electrode according to claim 6, characterized in that, In the case where the insulating adhesive paper (13) with the abutment protrusion (161) is bonded to one of the tab groove (121) and the clearance groove (122), and the other is filled with the insulating support layer (14) that contacts the empty foil (11), The insulating adhesive paper (13) with the abutting protrusion (161) is bonded to the tab groove (121), and the insulating support layer (14) that contacts the empty foil (11) is filled inside the clearance groove (122).

8. The lithium battery electrode according to claim 5, characterized in that, The insulating adhesive tape (13) includes an adhesive section (131) and a transition section (132) connected to each other. The adhesive section (131) is located outside the tab groove (121) or the clearance groove (122) and is bonded to the surface of the active material layer (12). The transition section (132) extends into the tab groove (121) or the clearance groove (122). The abutting protrusion (161) is separately connected to the insulating adhesive tape (13). The support structure (16) is disposed on the side of the adhesive section (131) or the transition section (132) facing the empty foil (11).

9. The lithium battery electrode according to claim 5, characterized in that, The material of the abutment protrusion (161) is a porous material, which includes a carbon material with a high specific surface area and a binder. The carbon material includes SP / acetylene black / Kejtien black / activated carbon, and the binder includes PVDF / CMC / PAA.

10. The lithium battery electrode according to claim 1, characterized in that, The lithium battery electrode also includes a tab (15) partially disposed in the tab groove (121), the support structure (16) disposed in the tab groove (121) having the tab (15) abutting against the empty foil (11), and / or, the support structure (16) disposed in the tab groove (121) having the tab (15) abutting against the tab (15).

11. A lithium battery cell, characterized in that, The lithium battery cell includes a separator and a lithium battery electrode sheet according to any one of claims 1 to 10. The lithium battery electrode sheet and the separator are stacked, bent or wound to form the lithium battery cell, and the tab of the lithium battery electrode sheet is located in the middle region of the lithium battery cell.

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