Laminated cell tab
By designing inconsistent tab lengths and materials in stacked cells, the problem of material excess at the tab welding joint in existing technologies has been solved, achieving higher energy density and welding effect, reducing battery internal resistance, and improving battery safety and performance.
Patent Information
- Application Number
- CN202520277730.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-20
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2035-02-20
AI Technical Summary
In the existing technology, the identical design of all tabs in the battery cell results in a large amount of excess tab material at the welding points, which increases the battery weight, reduces energy density, and may lead to poor welding or weld cracking.
The design incorporates laminated cell tabs, ensuring that the tabs on the outer side of the laminated cell are longer than those on the inner side. The tab lengths of each laminate are not uniform, increasing progressively from one layer to the next. Copper or aluminum foil tabs are used to ensure welding performance and uniform current distribution.
This avoids unnecessary waste of tab material, improves welding effect and current uniformity, reduces battery internal resistance, and enhances energy density and safety.
Smart Images
Figure CN223598773U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of electric core, concretely relates to a lamination type electric core tab. BACKGROUND
[0002] In the process of manufacturing power battery, after the manufacturing of the pole piece is completed, the positive and negative pole pieces and the diaphragm Z-shaped folding is folded together to form a laminated body, the tab of each laminated body needs to be aligned, and the subsequent process needs to connect and weld the tab and the cover plate, if the tabs are not aligned, the welding cannot be performed, and the product contact is poor.
[0003] In the prior art, the tab is formed by using a size shape with an interference relative to the welding requirement area, for this, the tabs of all laminated bodies are set the same in the prior art to ensure the alignment of the tabs after being stacked into an electric core, and finally ensure that each layer of tab can be welded.
[0004] After the tab is welded, because the height of the tabs of all laminated bodies is set the same, there is a large amount of tab material excess at the tab welding position, which increases the weight of the battery, reduces the energy density of the product, and also easily causes the product to be misjudged due to the tab excess, and finally causes the product to be false welding or cracking. UTILITY MODEL CONTENTS
[0005] The utility model provides a lamination type electric core tab to solve the problem of a large amount of tab material excess at the tab welding position caused by the same design of all tabs in the electric core in the prior art.
[0006] In order to solve the above technical problem, the utility model provides a lamination type electric core tab, which is arranged in a lamination type electric core, the lamination type electric core includes a plurality of laminated bodies, and the lamination type electric core tab includes:
[0007] A positive tab;
[0008] A negative tab, the negative tab is symmetrically arranged with the positive tab on both sides of the laminated body, and in a first direction perpendicular to the end face of the laminated body, the length of the tab of the laminated body located outside the lamination type electric core along the first direction is greater than the length of the tab of the laminated body located inside the lamination type electric core along the first direction.
[0009] Optionally, the lengths of the tabs of different laminated bodies of the lamination type electric core in the first direction are different.
[0010] Optionally, in a second direction away from the innermost laminated body of the lamination type electric core, the length of the tab of the laminated body of the lamination type electric core in the first direction increases layer by layer.
[0011] Optionally, the length difference of the tab of any adjacent two of the laminated bodies in the first direction is equal.
[0012] Optionally, the length of the positive electrode tab and the length of the negative electrode tab in the first direction are symmetrical.
[0013] Optionally, the length of the positive electrode tab and the length of the negative electrode tab in the third direction perpendicular to the first direction are symmetrical.
[0014] Optionally, the positive electrode tab and the negative electrode tab are foils.
[0015] Optionally, the material of the negative electrode tab is copper.
[0016] Optionally, the material of the positive electrode tab is aluminum.
[0017] Optionally, the welding area of the first tab of the laminated body outside the laminated type battery is greater than the area of the second tab of the laminated body inside the laminated type battery.
[0018] Compared with the prior art, the laminated type battery tab provided by the utility model has the following beneficial effects:
[0019] In the utility model, the length of the tab of the laminated body outside the laminated type battery along the first direction is greater than the length of the tab of the laminated body inside the laminated type battery along the first direction, so that all the tabs in the laminated type battery are not all the same, obviously, this can avoid the prior art that all the tabs in the laminated type battery are arranged the same, thereby causing the tabs that do not need a large area to be designed the same as the tabs that need a large area, resulting in the problem of a large amount of tab material excess at the tab welding position. BRIEF DESCRIPTION OF DRAWINGS
[0020] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, obviously, the drawings in the following description are only a part of the embodiments of the utility model, not all the embodiments, for those skilled in the art, under the premise of not paying creative labor, according to these drawings, other drawings obtained also belong to the protection scope of the utility model.
[0021] Figure 1 It is the front view of the laminated type battery when the first direction is taken as the front direction and is provided in the embodiments of the utility model;
[0022] Figure 2 It is the distribution diagram of each layer of the laminated type battery and the tab on it and is provided in the embodiments of the utility model.
[0023] Figure 3 is another front view of the laminated chip type battery when the first direction is taken as the front direction, provided by the embodiment of the present application.
[0024] Figure number explanation: 100 - laminated body, 110 - positive pole piece, 111 - positive pole lug, 120 - negative pole piece, 121 - negative pole lug, 130 - welding area. DETAILED DESCRIPTION
[0025] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below with reference to the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.
[0026] In order to make the description of the present disclosure more detailed and complete, the following describes the embodiments of the present application and the specific embodiments; but this is not the only form of implementation or use of the specific embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.
[0027] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.
[0028] In addition, in the description of the embodiments of the present application, "a plurality of" means two or more than two, and other quantifiers similar thereto should be understood. The preferred embodiments described herein are only used to illustrate and explain the present application, and not to limit the present application, and the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.
[0029] The present application provides a laminated chip type battery lug, which is arranged in a laminated chip type battery, as shown in Figure 1 As shown in the front view of the laminated chip type battery when the first direction is taken as the front direction (the pole piece is not welded), the laminated chip type battery comprises a plurality of laminated bodies 100, wherein the laminated body 100 comprises a positive pole piece 110, a negative pole piece 120 and a separator (not shown in the figure), and the positive pole piece 110, the negative pole piece 120 and the separator are sequentially wrapped from inside to outside to form the laminated body 100, and the separator is in the middle of the laminated body 100.
[0030] Furthermore, the laminated cell tabs include a positive tab 111 and a negative tab 121. The negative tab 121 and the positive tab 111 are symmetrically arranged on both sides of the laminate 100, with the negative tab 121 disposed on the negative electrode plate 120 and the positive tab 111 disposed on the positive electrode plate 110. It should be noted that the symmetry between the positive tab 111 and the negative tab 121 refers to the symmetrical position of the positive tab 111 and the positive electrode plate 110 relative to the laminate 100, and the symmetrical shape of the positive tab 111 and the negative tab 121.
[0031] Furthermore, the direction perpendicular to the end face of the laminate 100 is the first direction. It should be noted that the end face of the laminate 100 is the surface formed by the ends of each layer of the laminate 100, that is, the surface formed by the same end of the positive electrode 110, the negative electrode 120 and the diaphragm in the laminate 100.
[0032] Furthermore, such as Figure 2 The diagram, from left to right, shows the distribution of each layer of electrodes and their tabs in a laminated battery cell, from the outermost to the innermost layer and from the innermost to the outermost layer. The length of the tabs of the laminated body 100 located on the outer side of the laminated battery cell along the first direction is greater than the length of the tabs of the laminated body 100 located on the inner side of the laminated battery cell along the first direction. It should be noted that the tabs of each laminated body 100 can be either positive tabs 111 or negative tabs 121. Since they are symmetrical, they can be collectively referred to as the tabs of the laminated body 100. It is understandable that the length of the tabs of the stacked body 100 located on the outside of the stacked cell along the first direction is greater than the length of the tabs of the stacked body 100 located on the inside of the stacked cell along the first direction. This means that not all the tabs in the stacked cell are the same. Obviously, this can avoid the problem in the prior art where all the tabs in the stacked cell are set to be the same, which would cause tabs that do not need a large area to be designed to be the same as tabs that need a large area, resulting in a large amount of tab material surplus at the tab welding joint.
[0033] In one alternative implementation, the tabs of different stacks 100 of the laminated cell have different lengths in the first direction.
[0034] It is understandable that the lengths of the tabs of different stacked bodies 100 in the first direction are different. This means that the lengths of the tabs of each stacked body 100 in the first direction are different from the lengths of the tabs of other stacked bodies 100 in the first direction. Therefore, compared with the design where the length of the tabs of the stacked bodies 100 located on the outside of the stacked cell in the first direction is greater than the length of the tabs of the stacked bodies 100 located on the inside of the stacked cell in the first direction, the problem of a large amount of tab material excess at the tab welding point can be further avoided.
[0035] In an optional implementation, the length of the tab of the jelly-roll 100 of the jelly-roll type battery in the first direction increases layer by layer along the second direction away from the innermost jelly-roll 100 of the jelly-roll type battery.
[0036] It can be understood that the innermost jelly-roll 100 of the jelly-roll type battery is the jelly-roll 100 at the center of the jelly-roll type battery, and the second direction away from the innermost jelly-roll 100 of the jelly-roll type battery is the direction from the jelly-roll 100 at the center of the jelly-roll type battery to the jelly-roll 100 at the outer layer of the jelly-roll type battery. Further, in the second direction, the length of the tab of the jelly-roll 100 of the jelly-roll type battery in the first direction increases layer by layer, and the closer to the outer jelly-roll 100 of the jelly-roll type battery, the longer the length of the tab in the first direction, and the closer to the inner jelly-roll 100 of the jelly-roll type battery, the shorter the length of the tab in the first direction. It can be understood that through such a design, the length of the tab of each jelly-roll 100 in the jelly-roll type battery in the first direction is not the same. And since the tabs of the jelly-roll type battery are welded together when welding, it is ensured that the length of the tab of the jelly-roll 100 of the jelly-roll type battery in the first direction increases layer by layer in the second direction, which can ensure that the positive tab 110 and the negative tab 120 of the jelly-roll 100 at the outer side of the jelly-roll type battery are not blocked by the tabs of the jelly-roll 100 at the inner side between the two, so that the positive tab 110 and the negative tab 120 of each jelly-roll 100 can be better welded together.
[0037] In an optional implementation, the difference between the length of the tabs of any two adjacent jelly-rolls 100 in the jelly-roll type battery in the first direction is equal.
[0038] It can be understood that the difference between the length of the tabs of any two adjacent jelly-rolls 100 in the jelly-roll type battery in the first direction is equal, that is, when the length of the tab of the jelly-roll 100 of the jelly-roll type battery in the first direction increases layer by layer in the second direction, the length of each increase is the same. This can improve the tab alignment, improve the welding effect and the overcurrent capacity.
[0039] In an optional implementation, the length of the positive tab 111 and the negative tab 121 in the first direction is symmetrical.
[0040] It can be understood that during the operation of the battery cell, current flows out from the positive tab 111, passes through the external circuit, and then flows into the battery cell from the negative tab 121. When the positive tab 111 and the negative tab 121 have the same height, the electric field distribution in the battery cell is relatively more symmetrical. This symmetrical electric field distribution helps to make the current uniformly distributed in the battery cell and on the tabs. When the positive tab 111 and the negative tab 121 have the same height, it helps to ensure that the working state of each battery cell during charging and discharging is more consistent.
[0041] In an optional implementation, in a third direction perpendicular to the first direction, the length of the positive tab 111 is symmetrical to the length of the negative tab 121.
[0042] It can be understood that when the positive tab 111 and the negative tab 121 have the same width, under the same material and conductivity conditions, they can provide similar current carrying capacity. This uniform current carrying capacity helps to prevent local overheating. If the tab widths are different, the narrower tab can generate more heat due to excessive current density, which not only affects the performance of the battery, but also may cause safety hazards. For example, during high-rate charging and discharging, uneven current carrying can cause the tab temperature to be too high, which can degrade the performance of the electrode material and electrolyte of the battery, and shorten the service life of the battery. The battery internal resistance is one of the important factors affecting the performance of the battery. The width of the tab directly affects the battery internal resistance, and the positive tab 111 and the negative tab 121 with the same width help to reduce the difference in the internal resistance of the battery cell.
[0043] In an optional implementation, the positive tab 111 and the negative tab 121 are in the form of a foil.
[0044] It can be understood that the foil material is relatively thin and has a certain flexibility, which makes it easy to process. During the manufacturing process of the battery cell, the foil can be easily processed into tabs with the required shape and size through processes such as stamping and cutting. For example, the width, length, and other parameters of the tab can be accurately controlled to meet the requirements of different battery designs. The foil tab has good heat dissipation performance due to its large surface area to volume ratio. During the operation of the battery, especially during high-rate charging and discharging, heat is generated. The heat can be dissipated through the surface of the tab.
[0045] In an optional implementation, the material of the negative tab 121 is copper.
[0046] Copper is an excellent electrical conductor, second only to silver in conductivity. Under the same electric field strength, copper's high conductivity means it can generate a higher current density, thus conducting current efficiently. During battery discharge, especially in high-rate discharge scenarios, copper negative electrode tabs 121 ensure that electrons flow rapidly from the external circuit back to the cell. Copper exhibits relatively stable chemical properties in the normal operating environment and electrolyte system of the battery. It is compatible with many negative electrode active materials and electrolyte components. Copper has good ductility and malleability, making it easy to process into negative electrode tabs 121 of various shapes.
[0047] In one alternative implementation, the positive electrode tab 111 is made of aluminum.
[0048] Understandably, aluminum has good electrical conductivity, although slightly less than copper, it is sufficient to meet the conductivity requirements in battery positive electrode applications. According to the conductivity formula, aluminum can effectively conduct current. Aluminum is a common metallic material, abundant in nature, and relatively inexpensive. In battery manufacturing, using aluminum as the positive electrode tab material can effectively reduce production costs.
[0049] In one alternative implementation, Figure 3 The image shown is a front view of a stacked battery cell after electrode welding, provided by an embodiment of this utility model, with the first direction as the front view direction. Figure 3 As shown, the welding area 130 of the first tab of the stacked body 100 on the outer side of the laminated cell is larger than the area of the first tab extending beyond the second tab of the innermost stacked body 100 of the laminated cell.
[0050] It should be noted that when welding the tabs of the laminated battery cell, all the tabs need to be welded together. Since the innermost stack 100 of the laminated battery cell is the middle stack 100, the welding area 130 of the first tab of the outer stack 100 of the laminated battery cell is larger than the area of the first tab extending beyond the second tab of the innermost stack 100 of the laminated battery cell. This ensures that when the first tab of the outer stack 100 of the laminated battery cell is brought together to the second tab for welding, it can be welded together with the second tab, thereby ensuring that all the tabs can be welded together.
[0051] Specifically, in order to make the welding area 130 of the first tab of the stacked body 100 on the outer side of the laminated cell larger than the area of the first tab extending beyond the second tab of the innermost stacked body 100 of the laminated cell, a portion of the second tab can be used as the welding area 130. The area of this welding area 130 can be set according to the specific needs of the application, and is not limited in detail here.
[0052] The above technical solutions provided by the utility model are described in detail, the principle and implementation mode of the utility model are described by applying specific examples in the utility model, the above embodiment description is only used for helping to understand the structure of the utility model and its core idea; meanwhile, for the general technical personnel in the field, according to the idea of the utility model, the specific implementation mode and application range will have changes, and according to the above, the content of the specification should not be understood as the limitation of the utility model.
[0053] Obviously, those skilled in the art can make various modifications and variations to the utility model without departing from the spirit and scope of the utility model. Thus, if these modifications and variations of the utility model belong to the scope of the utility model claims and their equivalents, the utility model also intends to include these modifications and variations.
Claims
1. A tab for a laminated battery cell, disposed in a laminated battery cell, the laminated battery cell comprising multiple laminated bodies, characterized in that, The laminated battery cell tabs include: Positive electrode; The negative electrode tab is symmetrically arranged on both sides of the stacked body with the positive electrode tab. In a first direction perpendicular to the end face of the stacked body, the length of the electrode tab of the stacked body located on the outside of the stacked cell along the first direction is greater than the length of the electrode tab of the stacked body located on the inside of the stacked cell along the first direction.
2. The laminated cell tab according to claim 1, characterized in that, The tabs of the different layers of the laminated battery cell have different lengths in the first direction.
3. The stacked cell tab according to claim 2, characterized in that, Along a second direction away from the innermost layer of the stacked cell, the length of the tabs of the stacked cell increases layer by layer in the first direction.
4. The stacked cell tab according to claim 3, characterized in that, In the laminated battery cell, the difference in length between the tabs of any two adjacent laminates in the first direction is equal.
5. The laminated cell tab according to claim 1, characterized in that, The positive electrode tab and the negative electrode tab are symmetrical in length in the first direction.
6. The stacked cell tab according to claim 5, characterized in that, In a third direction perpendicular to the first direction, the length of the positive electrode tab is symmetrical to the length of the negative electrode tab.
7. The laminated cell tab according to claim 1, characterized in that, The positive electrode tab and the negative electrode tab are in the form of foil.
8. The stacked cell tab according to claim 7, characterized in that, The negative electrode tab is made of copper.
9. The laminated cell tab according to claim 8, characterized in that, The positive electrode tab is made of aluminum.
10. The laminated cell tab according to claim 1, characterized in that, The welding area of the first tab of the stacked body on the outer side of the laminated cell is larger than the area of the first tab extending beyond the second tab of the stacked body on the innermost side of the laminated cell.