Battery and battery device
By adding metal material to the grooves of the pole column to form a metal layer, the welding quality problems caused by the gap between the pole ear and the pole column are solved, and higher welding quality and welding strength are achieved.
Patent Information
- Application Number
- CN202421114923.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-21
- Publication Date
- 2025-02-25
- Estimated Expiration
- 2034-05-21
AI Technical Summary
There is a gap between the pole ear and the pole column, resulting in a large resistance and affecting the welding quality.
Adding metal material into the grooves of the pole columns forms a metal layer, which is at least partially located between the pole ears and the pole columns, reducing gaps and improving welding quality.
By reducing the gap between the pole column and the pole ear, welding quality is improved, metal material splashing and metal layer area are avoided, and the welding strength is enhanced.
Smart Images
Figure CN222530751U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a battery and a battery device. Background Art
[0002] In the related art, the pole lug and the pole post are usually welded by a resistance welding process. However, there is a gap between the pole lug and the pole post, and the resistance between the pole lug and the pole post is relatively large, thereby affecting the welding quality between the pole lug and the pole post.
[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content
[0004] The utility model provides a battery, which can improve the technical problem that a pole ear and a welding head are easy to stick together.
[0005] Battery Included:
[0006] Extreme ears;
[0007] Pole;
[0008] A metal layer, wherein at least a portion of the metal layer is located between the pole ear and the pole post, and the pole ear, the pole post and the metal layer are connected by welding;
[0009] Wherein, at least one groove is formed on a side of the pole facing the pole ear, and the metal layer is at least partially located in the groove.
[0010] The utility model can add metal material for forming a metal layer into the groove of the pole. On the one hand, the metal material can reduce the gap between the pole and the pole ear, thereby improving the welding quality between the pole ear and the pole; on the other hand, the groove can limit the metal material, thereby avoiding the splashing of the metal material, which not only affects the welding effect but also generates metal chips; on the other hand, the groove can also control the diffusion area of the metal material, thereby avoiding an excessively large area of the metal layer.
[0011] The utility model also provides a battery device, which comprises the battery mentioned above.
[0012] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] In order to better understand the present disclosure, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, related elements or components may have different arrangements as known in the art. In addition, in the drawings, the same reference numerals represent the same or similar components in each drawing.
[0014] in:
[0015] Figure 1 A schematic diagram of a partial structure of an exemplary embodiment of a battery disclosed herein;
[0016] Figure 2 It is a schematic structural diagram of the side of the pole facing the pole ear in another exemplary embodiment of the battery disclosed in the present invention.
[0017] Description of reference numerals:
[0018] 1. Pole ear; 2. Pole column; 3. Metal layer; 21. Groove. DETAILED DESCRIPTION
[0019] The following will be combined with the accompanying drawings in the exemplary embodiments of the present disclosure to clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the present disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present disclosure.
[0020] In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and / or" includes any and all combinations of one or more associated listed items. In particular, reference to "the / the" object or "an" object is also intended to indicate one of a possible plurality of such objects.
[0021] Unless otherwise specified or explained, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.
[0022] Further, in the description of the present disclosure, it should be understood that the directional words such as "upper", "lower", "inner", "outer" and the like described in the exemplary embodiments of the present disclosure are described at the angles shown in the accompanying drawings and should not be understood as limitations on the exemplary embodiments of the present disclosure. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to one or more "upper", "lower", or "inner", "outer" of another element, it can not only be directly connected to the "upper", "lower", "inner", "outer" of another element or elements, but can also be indirectly connected to the "upper", "lower", "inner", "outer" of another element or elements through an intermediate element.
[0023] like Figure 1 , which is a partial structural schematic diagram of an exemplary embodiment of the battery disclosed in the present invention. The battery comprises: a pole lug 1, a pole post 2, and a metal layer 3, wherein the metal layer 3 is at least partially located between the pole lug 1 and the pole post 2, and the pole lug 1, the pole post 2, and the metal layer 3 are welded and connected; wherein a groove 21 is formed on the side of the pole post 2 facing the pole lug 1, and the metal layer 3 is at least partially located in the groove 21.
[0024] In this exemplary embodiment, metal material for forming a metal layer can be added into the groove 21 of the pole. On the one hand, the metal material can reduce the gap between the pole 2 and the pole lug 1, thereby improving the welding quality between the pole lug 1 and the pole 2; on the other hand, the groove 21 can limit the metal material, thereby avoiding the splashing of the metal material, which not only affects the welding effect but also generates metal chips; on the other hand, the groove 21 can also control the diffusion area of the metal material, thereby avoiding an excessively large area of the metal layer.
[0025] In this exemplary embodiment, the melting point of the metal layer 3 may be lower than the melting point of the pole lug 1, and the melting point of the metal layer 3 may be lower than the melting point of the pole post 2. The metal material forming the metal layer may be a solder, and the metal material first melts during the resistance welding process of the pole lug and the pole post, and the metal material may fill the gap between the pole lug and the pole post, and the melted metal material may drive the pole lug 1 and the pole post 2 to melt, and this arrangement may improve the welding efficiency and welding quality of the pole lug 1 and the pole post 2.
[0026] In this exemplary embodiment, the weld area between the pole 2 and the pole lug 1 is larger than the total opening area of all the grooves 21. When the total opening area of the grooves 21 is too large, the solder area is too large, which may cause spatter during welding.
[0027] In this exemplary embodiment, the area of the metal layer 3 on the tab 1 where the orthographic projection does not overlap with the weld mark between the pole 2 and the tab 1 is S1, the weld mark area between the pole 2 and the tab 1 is S2, and S1 / S2 is 0.05-0.20, for example, S1 / S2 can be equal to 0.05, 0.1, 0.15, 0.2, etc. If S1 / S2 is too small, the pole and the tab cannot be completely melted in the welding area, resulting in the risk of cold welding, and if S1 / S2 is too large, it will cause spatter during welding, affecting the safety of the manufacturing process.
[0028] It should be noted that, because the fixing strength of the weld print area is great and cannot be peeled off, after the tab and the pole are peeled off, a hole will be formed on the tab, and the area of the metal layer remaining around the hole is S1.
[0029] In this exemplary embodiment, the weld area between the pole 2 and the pole lug 1 is S2, the total opening area of all the grooves 21 is S3, and S3 / S2 is 0.05-0.95. For example, S3 / S2 can be equal to 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, etc. If S3 / S2 is too large, the opening area of the groove 21 is too large, and welding slag splashing is easy to occur when the pole lug 1 and the pole 2 are welded; if S3 / S2 is too small, the opening area of the groove 21 is too small, the contact area between the metal layer and the pole lug is too small, and the welding strength between the pole lug and the metal layer is too small. In this exemplary embodiment, S3 / S2 is set to a suitable size, which can avoid welding slag splashing and ensure the welding strength between the pole lug 1 and the pole 2 at the same time.
[0030] It should be noted that the total opening area of all the grooves 21 can be obtained by: after the tab is peeled off from the pole, the surface of the pole facing the tab is polished to a roughness Ra≤0.1mm, and then the total opening area of all the grooves 21 is measured. In general, the boundary between the groove and the tab is obvious and identifiable; when the boundary is unclear, the area formed by the outermost solder is the total opening area of the groove.
[0031] In this exemplary embodiment, the depth of the groove 21 is h1, the thickness of the pole ear 1 is h2, and h1 / h2 is 0.1-1. For example, h1 / h2 can be equal to 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, etc. When h1 / h2 is too small, the amount of solder is too small, resulting in a poor welding between the pole ear and the pole. When h1 / h2 is too large, due to the need for pressure during the welding process, it is easy for the pole ear to form a pit at the groove after welding, thereby increasing the stress there, and the pole ear is at risk of breaking.
[0032] In the present exemplary embodiment, the depth of the groove 21 is 0.1 mm to 1 mm, and / or the thickness of the tab 1 is 0.1 mm to 2 mm. For example, the depth of the groove 21 may be equal to 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, etc. The thickness of the tab 1 may be equal to 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, etc.
[0033] In this exemplary embodiment, Figure 2 As shown, it is a schematic diagram of the structure of the side of the pole facing the pole lug in another exemplary embodiment of the battery disclosed in the present invention. A plurality of grooves 21 are formed on the side of the pole 2 facing the pole lug 1, and the metal layer 3 is at least partially located in each groove 21. In this exemplary embodiment, a plurality of grooves 21 are formed on the side of the pole 2 facing the pole lug 1. When the pole lug 1 and the pole 2 are welded, metal materials can be arranged in each groove 21, and the metal materials in each groove can form a metal layer 3 after melting. The welding strength of the pole lug 1 and the pole 2 at the position of the groove 21 is relatively high. In this exemplary embodiment, a plurality of grooves are formed on the side of the pole 2 facing the pole lug, that is, a plurality of welding areas with high welding strength are formed between the pole lug 1 and the pole 2. This arrangement can further improve the welding strength between the pole lug and the pole.
[0034] It should be noted that, in this exemplary embodiment, the metal layer 3 may be an integral structure, or may include a plurality of sub-metal layers disposed at intervals.
[0035] In this exemplary embodiment, Figure 2 As shown, at least part of the grooves 21 are arranged around at least part of other grooves 21. Figure 2 As shown, the plurality of grooves 21 may be spaced apart and distributed from the axis of the pole 2 to the side away from the axis of the pole 2 .
[0036] In this exemplary embodiment, the electrode tab may include a copper structure or an aluminum structure, and the electrode post may also include a copper structure or an aluminum structure.
[0037] It should be noted that a battery includes a cell and an electrolyte, and a battery is the smallest unit capable of performing electrochemical reactions such as charge / discharge. A cell refers to a unit formed by winding or laminating a stacked portion, wherein the stacked portion includes a first pole sheet, a separator, and a second pole sheet. When the first pole sheet is a positive pole sheet, the second pole sheet is a negative pole sheet. The polarities of the first pole sheet and the second pole sheet can be interchanged. The first pole sheet and the second pole sheet are coated with an active material.
[0038] In this exemplary embodiment, the battery may be a lithium-ion battery. It should be understood that in other exemplary embodiments, the battery may also be a nickel-cadmium battery, a nickel-metal hydride battery, a lithium polymer battery, a sodium-ion battery, a solid-state battery, etc.
[0039] In other exemplary embodiments, the battery may be a square battery, that is, the battery may be a quadrangular prism-type battery. The quadrangular prism-type battery mainly refers to a battery having a prism-shaped appearance, but does not strictly limit whether each side of the prism must be a straight line in the strict sense, and the corners between the sides are not necessarily right angles, and may be arc transitions.
[0040] The battery can be a laminated battery, which is not only convenient to group, but also can be processed to obtain a longer battery. Specifically, the battery cell is a laminated battery cell, which has a first pole piece stacked on top of each other, a second pole piece with electrical properties opposite to the first pole piece, and a diaphragm sheet arranged between the first pole piece and the second pole piece, so that multiple pairs of first pole pieces and second pole pieces are stacked to form a laminated battery cell.
[0041] Alternatively, the battery may be a wound battery, that is, a first pole sheet, a second pole sheet with electrical properties opposite to the first pole sheet, and a diaphragm sheet arranged between the first pole sheet and the second pole sheet are wound to obtain a wound battery cell.
[0042] The exemplary embodiment further provides a battery device, which is a battery module or a battery pack.
[0043] The battery module includes a plurality of batteries, which may be square batteries, and the battery module may further include end plates and side plates, which are used to fix the plurality of batteries. The batteries may be cylindrical batteries, which may be arranged on a support plate to form a battery module.
[0044] The battery pack includes a plurality of batteries and a box body, and the box body is used to fix the plurality of batteries.
[0045] It should be noted that the battery pack includes a battery, and the battery may be multiple, and the multiple batteries are arranged in the box. Among them, the multiple batteries can be installed in the box after forming a battery module. Alternatively, the multiple batteries can be directly arranged in the box, that is, there is no need to group the multiple batteries, and the box is used to fix the multiple batteries.
[0046] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing what is disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and embodiments are to be considered merely as exemplary, and the true scope and spirit of the present disclosure are indicated by the claims.
[0047] The drawings in the present disclosure only relate to the structures involved in the present disclosure, and other structures may refer to the usual design. In the absence of conflict, the embodiments of the present disclosure and the features in the embodiments may be combined with each other to obtain new embodiments. It should be understood by those of ordinary skill in the art that the technical solutions of the present disclosure may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present disclosure, and should be included in the scope of the claims of the present disclosure.
[0048] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims
1. A battery, characterized in that: The battery comprises: Tab (1); Pole (2); A metal layer (3), wherein at least a portion of the metal layer (3) is located between the pole lug (1) and the pole post (2), and the pole lug (1), the pole post (2), and the metal layer (3) are connected by welding; Wherein, at least one groove (21) is formed on a side of the pole (2) facing the pole lug (1), and the metal layer (3) is at least partially located in the groove (21).
2. The battery according to claim 1, characterized in that The weld area between the pole (2) and the pole ear (1) is larger than the total opening area of all the grooves (21).
3. The battery according to claim 1, characterized in that The area of the region where the orthographic projection of the metal layer (3) on the pole lug (1) does not overlap with the weld mark between the pole column (2) and the pole lug (1) is S1, the area of the weld mark between the pole column (2) and the pole lug (1) is S2, and S1 / S2 is 0.05 to 0.
20.
4. The battery according to claim 2, characterized in that The weld area between the pole (2) and the pole ear (1) is S2, the total opening area of all the grooves (21) is S3, and S3 / S2 is 0.05 to 0.
95.
5. The battery according to claim 1, characterized in that The melting point of the metal layer (3) is lower than the melting point of the pole lug (1), and the melting point of the metal layer (3) is lower than the melting point of the pole (2).
6. The battery according to any one of claims 1 to 5, characterized in that: The depth of the groove (21) is h1, the thickness of the tab (1) is h2, and h1 / h2 is 0.1-1.
7. The battery according to any one of claims 1 to 5, characterized in that: The depth of the groove (21) is 0.1 mm to 1 mm, and / or the thickness of the tab (1) is 0.1 mm to 2 mm.
8. The battery according to any one of claims 1 to 5, characterized in that: A plurality of grooves (21) are formed on a side of the pole (2) facing the pole lug (1), and the metal layer (3) is at least partially located in each of the grooves (21).
9. The battery according to claim 8, characterized in that At least part of the grooves (21) are arranged around at least part of other grooves (21).
10. A battery device, characterized in that: The battery device comprises the battery according to any one of claims 1 to 9.