Anti-misplacement welding structure of battery shell and current collector plate
By setting a concave-convex structure between the current collector and the battery casing, the problem of easy misalignment during welding of the current collector and the battery casing is solved, achieving low-cost, high-reliability anti-misalignment welding, making the welding more robust, saving more materials, and improving battery performance and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YIXING HUIHUA COMPOSITE MATERIAL CO LTD
- Filing Date
- 2025-03-14
- Publication Date
- 2026-06-09
AI Technical Summary
In existing technologies, the welding of the current collector and the battery casing is prone to misalignment due to misalignment, vibration or thermal deformation, which leads to increased connection resistance and safety hazards. Moreover, existing solutions are costly, complex and inefficient.
The concave-convex structure design ensures that the welding parts of the current collector and the bottom of the battery casing correspond, preventing misalignment, and achieving a more robust connection through lateral welding.
It achieves low-cost, high-reliability anti-misalignment welding, resulting in stronger welds, more economical material usage, reduced risk of welding misalignment, and improved battery performance and safety.
Smart Images
Figure CN224342477U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of batteries, and in particular to a non-misalignment welding structure for a battery casing and a current collector. Background Technology
[0002] In the manufacturing of lithium-ion batteries and other batteries, the welding of the current collector to the battery casing is one of the core processes. In traditional welding processes, because the contact surface between the current collector and the bottom of the casing is flat, misalignment, vibration, mechanical errors, or thermal deformation can easily cause relative displacement during assembly, resulting in welding misalignment. Misalignment can lead to increased connection resistance, decreased battery performance, and even safety hazards.
[0003] In existing technologies, misalignment problems are typically solved using precision fixtures or vision positioning systems, but these methods are costly, complex, and inefficient. Therefore, there is an urgent need for a low-cost, highly reliable anti-misalignment structural design. Utility Model Content
[0004] The purpose of this invention is to provide a non-misaligned welding structure for the battery casing and the current collector.
[0005] The innovation of this utility model lies in the fact that the concave-convex structure makes the welding parts of the current collector and the bottom of the battery casing correspond, making it less likely to weld incorrectly.
[0006] To achieve the aforementioned objectives, the technical solution of this utility model is as follows:
[0007] A misalignment prevention welding structure for a battery casing and a current collector includes a battery casing, a core and a current collector are provided inside the battery casing, the core is welded to the current collector, the current collector is welded to the bottom of the battery casing, the current collector has one or more recesses or protrusions, and the bottom of the battery casing has protrusions or depressions that match the recesses or protrusions on the current collector; a portion of the bottom area of the battery casing is a welding area.
[0008] Furthermore, the battery casing welding area has an outwardly protruding notch with openings at both ends. The protrusion of the current collector is inserted into the notch from one end, and the protrusion and the notch are welded together. The protruding part with welding can be welded laterally, resulting in less dust and allowing for overload welding.
[0009] Furthermore, the recesses, convexities, protrusions, and depressions are all frustum-shaped structures, with the notches and depressions overlapping. This facilitates insertion.
[0010] Furthermore, the battery casing has an insertion hole at the welding area, and the current collector has a protrusion for inserting into the insertion hole. This facilitates welding.
[0011] Furthermore, the insertion hole has a frustum-shaped structure, which facilitates the insertion and welding of the manifold.
[0012] Furthermore, the side where the current collector and the core are welded is the core welding layer, and the side where the core is welded to the bottom of the battery casing is the bottom casing welding layer, and the core welding layer has a central hole in the center.
[0013] Furthermore, the core welding layer is also provided with several through holes corresponding to the welding areas. This prevents the nickel layer here from melting due to heat during welding of the current collector and the bottom of the battery casing.
[0014] Furthermore, a stainless steel or aluminum sheet is provided at the through-hole. This prevents rusting.
[0015] Furthermore, the bottom wall thickness of the battery casing is greater than the side wall thickness, and the wall thickness at the welding area at the bottom of the battery casing is less than the wall thickness at other parts of the bottom of the battery casing. This facilitates welding.
[0016] Furthermore, the size of the bottom weld layer of the current collector corresponds to the size of the bottom of the battery casing or the size of the welded area of the battery casing. This saves more materials.
[0017] The beneficial effects of this utility model are:
[0018] 1. The concave-convex structure in this utility model ensures that the welding parts of the current collector and the bottom of the battery casing correspond, making it less likely to weld incorrectly.
[0019] 2. In this utility model, the material used for the bottom welding layer can be precisely matched with the size of the welding area through the setting of the concave and convex structure, which saves more material.
[0020] 3. In this utility model, the welding joint with a three-dimensional structure can be set so that horizontal welding can be performed and welding can be performed with greater ease, resulting in a more solid weld. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the structure of Example 1.
[0022] Figure 2 This is a schematic diagram of the structure of Example 2.
[0023] Figure 3 This is a schematic diagram of the structure of Example 3.
[0024] Figure 4 This is a schematic diagram of the structure of Example 4.
[0025] Figure 5 This is a schematic diagram of the structure of Example 5. Detailed Implementation
[0026] The technical solutions in the embodiments of this utility model will now be clearly and completely described with reference to the accompanying drawings.
[0027] Example 1: A non-misalignment welding structure for a battery casing and a current collector includes a battery casing 1, a core 2 and a current collector 3 inside the battery casing 1, the core 2 being welded to the current collector 3, the current collector 3 being welded to the bottom of the battery casing 1, the current collector 3 having one or more recesses 3.1, and the bottom of the battery casing 1 having protrusions 1.1 matching the recesses 3.1 on the current collector 3; both the recesses 3.1 and the protrusions 1.1 are frustum-shaped structures, a portion of the bottom area of the battery casing 1 is a welding area 1.2, the side where the current collector 3 is welded to the core 2 is a core welding layer 3.4, and the side where it is welded to the bottom of the battery casing 1 is a bottom welding layer 3.5, the size of the bottom welding layer 3.5 of the current collector 3 corresponds to the size of the bottom of the battery casing 1.
[0028] Example 2: A non-misalignment welding structure for a battery casing and a current collector includes a battery casing 1, a core 2 and a current collector 3 inside the battery casing 1, the core 2 being welded to the current collector 3, the current collector 3 being welded to the bottom of the battery casing 1, the current collector 3 having one or more protrusions 3.3, and the bottom of the battery casing 1 having a recess 1.3 matching the protrusions 3.3 on the current collector 3; both the protrusions 3.3 and the recesses 1.3 are frustum-shaped structures, a portion of the bottom area of the battery casing 1 is a welding area 1.2, the side of the current collector 3 welded to the core 2 is a core welding layer 3.4, and the side welded to the bottom of the battery casing 1 is a bottom welding layer 3.5, the size of the bottom welding layer 3.5 of the current collector 3 corresponds to the size of the welding area of the battery casing 1, an insertion hole is provided at the welding area 1.2 of the battery casing, and the current collector 3 has a protrusion 3.2 for inserting into the insertion hole, the insertion hole 3.2 being frustum-shaped.
[0029] Example 3: A non-misalignment welding structure for a battery casing and a current collector includes a battery casing 1, a core 2 and a current collector 3 inside the battery casing 1, the core 2 being welded to the current collector 3, the current collector 3 being welded to the bottom of the battery casing 1, the current collector 3 having one or more protrusions 3.3, and the bottom of the battery casing 1 having a recess 1.3 matching the protrusions 3.3 on the current collector 3; both the protrusions 3.3 and the recesses 1.3 are frustum-shaped structures, and a portion of the bottom area of the battery casing 1 is a welding area 1.2. The side where the current collector 3 is welded to the core 2 is the core welding layer 3.4, and the side where it is welded to the bottom of the battery casing 1 is the bottom welding layer 3.5. The size of the bottom welding layer 3.5 of the current collector 3 corresponds to the size of the welding area of the battery casing 1. The welding area 1.2 of the battery casing is provided with an outward protruding notch with openings at both ends. The protrusion 3.3 of the current collector is inserted into the notch from one end and welded to the notch. Both the protrusion 3.3 and the notch are frustum-shaped structures.
[0030] Example 4: Referring to Example 3, the notch and the recess 1.3 overlap.
[0031] Example 5: Referring to Example 1, the core welding layer 3.4 has a central hole 3.41 at its center, and the core welding layer 3.4 also has several through holes 3.42 corresponding to the welding areas, with stainless steel or aluminum sheets provided at the through holes 3.42.
[0032] The described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.
Claims
1. A misalignment-preventing welding structure for a battery casing and a current collector, comprising a battery casing, wherein a core and a current collector are disposed within the battery casing, the core is welded to the current collector, and the current collector is welded to the bottom of the battery casing, characterized in that, The current collector has one or more recesses or protrusions, and the bottom of the battery casing has protrusions or recesses that match the recesses or protrusions on the current collector; a portion of the bottom area of the battery casing is a welding area.
2. The anti-misalignment welding structure between the battery casing and the current collector according to claim 1, characterized in that, The battery casing has an outwardly protruding notch at the welding area. The notch is open at both ends. The protrusion of the current collector is inserted into the notch from one end, and the protrusion and the notch are welded together.
3. The anti-misalignment welding structure between the battery casing and the current collector according to claim 2, characterized in that, The recesses, protrusions, bulges, and depressions are all frustum-shaped structures, with the openings and depressions overlapping.
4. The anti-misalignment welding structure between the battery casing and the current collector according to claim 1, characterized in that, An insertion hole is provided at the welding area of the battery casing, and a protrusion is provided on the current collector to insert into the insertion hole.
5. The anti-misalignment welding structure between the battery casing and the current collector according to claim 4, characterized in that, The insertion hole has a frustum-shaped structure.
6. The anti-misalignment welding structure between the battery casing and the current collector according to claim 1, characterized in that, The side where the current collector and the core are welded is the core welding layer, and the side where the core is welded to the bottom of the battery casing is the bottom welding layer. The core welding layer has a central hole in the center.
7. The anti-misalignment welding structure between the battery casing and the current collector according to claim 6, characterized in that, The core welding layer is also provided with several through holes corresponding to the welding areas.
8. The anti-misalignment welding structure between the battery casing and the current collector according to claim 7, characterized in that, The through hole is provided with a stainless steel sheet or an aluminum sheet.
9. The anti-misalignment welding structure between the battery casing and the current collector according to claim 1, characterized in that, The bottom wall thickness of the battery casing is greater than the side wall thickness of the battery casing, and the wall thickness at the bottom welding area of the battery casing is less than the wall thickness of other parts of the bottom of the battery casing.
10. The anti-misalignment welding structure between the battery casing and the current collector according to claim 1, characterized in that, The size of the bottom welding layer of the current collector corresponds to the size of the bottom of the battery casing or the size of the welding area of the battery casing.