Lower plastic part, cover plate assembly and battery
By setting multiple positioning blocks and inclined guide surfaces on the lower plastic parts, the problem of inaccurate positioning of the adapter sheet during battery welding is solved, and the accurate alignment and stable welding of the adapter sheet and the pole column are achieved, which improves the battery Yield rate and service life.
Patent Information
- Application Number
- CN202323443360.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-18
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2033-12-18
AI Technical Summary
During the welding process of battery adapter sheets, the prior art is difficult to ensure accurate positioning and sufficient contact of adapter sheets, resulting in risks of missing welding and false welding, which in turn affects the service life and yield of the battery.
A lower plastic part is designed, including a substrate and a positioning assembly, and a first through-hole and a plurality of positioning blocks are provided on the substrate. The positioning block locates the adapter in different directions, and an inclined guide surface is provided on the top surface to guide the rotation. The tab enters the positioning area to ensure accurate alignment and welding of the adapter tab with the pole column.
Through the restriction and inclined guide surfaces of multiple positioning blocks, precise positioning and stable welding of the adapter sheet is achieved, reducing the possibility of missing welding and dummy welding, and improving the yield and service life of the battery.
Smart Images
Figure CN222168534U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, and in particular to a lower plastic part, a cover plate assembly and a battery. Background Art
[0002] Secondary batteries (lithium / sodium ion batteries) are widely used in various fields due to their good charge and discharge performance, wide operating temperature range and long service life. As an important component of the battery, the adapter can connect the tabs of the battery cell and the poles on the top cover of the battery to achieve current transfer during the charge and discharge process. It can be said that the adapter is the connecting channel between the internal and external circuits.
[0003] In the actual production process, the adapter is generally ultrasonically welded to the pole ear of the battery cell and laser welded to the pole on the battery cover. During the laser welding process, it is necessary to ensure that the adapter is aligned with the pole on the battery cover and centered on the battery cover. Once the relative position between the adapter and the pole is incorrect, it is easy to cause welding leakage and thus cause battery failure; and if the adapter cannot be welded in the center of the battery cover, it may cause the battery cover to shift and misalign after the battery cell is assembled, resulting in difficulty in inserting the battery into the shell.
[0004] At present, the commonly used adapter welding positioning method is to design a protruding structure on the adapter, and at the same time make a corresponding positioning groove on the lower plastic part located below the battery top cover and fixed to the battery top cover. The two are connected in correspondence to play a positioning role. In order to clamp the adapter, the diameter of the positioning groove on the lower plastic part is usually slightly smaller than the diameter of the protruding structure. This also leads to the protruding structure on the adapter being pressed into the positioning groove. There may be insufficient contact with the lower plastic part, resulting in a risk of cold welding between the adapter and the pole. Utility Model Content
[0005] One of the purposes of the utility model is to provide a lower plastic part, which can accurately position the adapter plate at a preset position before welding and can fully contact the adapter plate.
[0006] To achieve this purpose, the utility model adopts the following technical solutions:
[0007] The lower plastic part includes a substrate and a positioning assembly, wherein the substrate is provided with a first through hole for the pole to pass through; the positioning assembly is arranged on the peripheral side of the first through hole, and the positioning assembly can position the adapter along the first direction and the second direction, and the positioning assembly includes a plurality of positioning blocks, and the plurality of positioning blocks enclose a positioning area on the substrate for placing the adapter, and the top surface of the positioning block is provided with a guide surface extending downwardly and obliquely toward the positioning area; the first direction is perpendicular to the second direction.
[0008] Preferably, a side of the positioning block facing the positioning area is arranged as a positioning surface perpendicular to the surface of the substrate, and the positioning surface is connected to an end of the guide surface that is inclined downward.
[0009] Preferably, the height of the positioning surface is 0.5-2.0 mm.
[0010] Preferably, the positioning block and the base plate are integrally formed by injection molding.
[0011] Preferably, a middle boss and an end boss are provided on the substrate, and the positioning assembly, the middle boss and the end boss are located on the same side of the substrate and between the middle boss and the end boss.
[0012] Preferably, the height of the positioning block is 5-8 mm.
[0013] Preferably, the inclination angle of the guide surface is 30°-60°.
[0014] Another object of the utility model is to provide a cover plate assembly, comprising a battery top cover, a pole and any of the above-mentioned lower plastic parts, wherein the battery top cover is arranged on the side of the lower plastic part facing away from the positioning assembly, and the battery top cover is provided with a mounting hole at a position corresponding to the first through hole, and the pole passes through the mounting hole and the first through hole in sequence.
[0015] Another object of the utility model is to provide a battery, comprising a battery cell, an adapter and the above-mentioned cover plate assembly, wherein the battery cell is provided with a positive electrode ear and a negative electrode ear, the electrode column comprises a positive electrode column and a negative electrode column, and the positive electrode ear and the negative electrode ear are respectively connected to the positive electrode column and the negative electrode column through two adapters.
[0016] Preferably, the adapter plate is provided with two inwardly recessed positioning grooves, and the two positioning blocks are respectively arranged in the two positioning grooves.
[0017] Beneficial effects of the utility model: The lower plastic part and the battery cover plate including the lower plastic part in the utility model, by setting a plurality of positioning blocks on the lower plastic part to enclose a positioning area for placing the adapter, restrict the movement of the adapter relative to the lower plastic part, thereby realizing the limit between the adapter and the battery cover plate, ensuring that the adapter is accurately positioned in the correct position before welding. At the same time, an inclined guide surface is set on the top surface of the positioning block, which can provide guidance for the adapter to enter the positioning area. The battery including the above-mentioned lower plastic part has a high yield rate. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a schematic diagram of the reverse structure of the cover plate assembly in the embodiment of the utility model;
[0019] Figure 2 It is a front structural schematic diagram of the cover plate assembly in the embodiment of the utility model;
[0020] Figure 3 This is a schematic diagram of the structure of the positioning block in the embodiment of the utility model;
[0021] Figure 4 It is a structural schematic diagram of the adapter plate and the cover plate assembly when assembled in the embodiment of the utility model;
[0022] Figure 5 It is a structural schematic diagram of the adapter plate positioned on the cover plate assembly in an embodiment of the utility model.
[0023] In the figure:
[0024] 1. substrate; 11. first through hole; 12. second through hole; 13. air-permeable groove; 14. middle boss; 15. end boss; 2. positioning block; 21. guide surface; 22. positioning surface;
[0025] 10. Battery cover; 101. Mounting hole; 102. Liquid injection hole; 103. Explosion-proof hole;
[0026] 20. adapter; 201. positioning groove;
[0027] 30. Pole;
[0028] 40. Explosion-proof valve;
[0029] 50. Welding fixture; 501. Avoidance groove; 502. Avoidance hole. DETAILED DESCRIPTION
[0030] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.
[0031] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0032] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0033] In the description of this embodiment, the terms "upper", "lower", "left", "right", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplified operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.
[0034] refer to Figure 1-Figure 5 As shown, in an embodiment of the utility model, a lower plastic part is proposed, including a substrate 1 and a positioning assembly. A first through hole 11 is provided on the substrate 1 for the pole 30 to pass through. Since the pole 30 includes a positive pole and a negative pole, two first through holes 11 are also provided, which are respectively located at the two ends of the length of the substrate 1. At the same time, a second through hole 12 for injecting electrolyte into the battery and a ventilation groove 13 for ventilation inside and outside the battery are also provided on the substrate 1. Two groups of positioning assemblies are respectively arranged on the surrounding sides of the two first through holes 11, including a plurality of positioning blocks 2. The plurality of positioning blocks 2 are arranged on the substrate 1 and can enclose a positioning area on the substrate 1 for placing the adapter 20. Moreover, in order to reduce the difficulty of the adapter 20 entering the positioning area, the top surface of each positioning block 2 is provided with a guide surface 21 extending downwardly and inclined in the direction of the positioning area.
[0035] It is understandable that in order to achieve accurate positioning of the adapter plate 20, the same group of positioning components needs to restrict the adapter plate 20 in the first direction and the second direction within the plane where the adapter plate 20 is located, and the first direction is perpendicular to the second direction. That is, the multiple positioning blocks 2 of the same group of positioning components must restrict the adapter plate 20 in at least four directions, namely, the positive direction of the first direction, the reverse direction of the first direction, the positive direction of the second direction, and the reverse direction of the second direction. For example, Figure 1 As shown, the first direction ( Figure 1 The X direction is the length direction of the substrate, and the second direction ( Figure 1 Y direction) is the width direction of the substrate.
[0036] The lower plastic part is provided with a plurality of positioning blocks 2 around the first through hole 11 to enclose a positioning area for placing the adapter 20. The adapter 20 is limited by the positioning blocks 2 and is positioned in the preset position of the lower plastic part, i.e., in the positioning area. During the welding process between the lower plastic part and the adapter 20, the adapter 20 no longer moves in translation relative to the lower plastic part, which reduces the possibility of welding leaks and cold welding between the adapter 20 and the pole 30. At the same time, it can ensure that the position of the battery cover plate and the main shell opening of the battery are accurately matched when the battery is inserted into the shell. Moreover, the setting of the guide surface 21 can make the adapter 20 move downward along the inclined direction of the guide surface 21 when the adapter 20 is offset relative to the positioning area, so that it slides into the positioning area, which reduces the difficulty of the adapter 20 entering the positioning area.
[0037] refer to Figure 3 As shown, the side of the positioning block 2 facing the positioning area is set as a positioning surface 22 perpendicular to the surface of the substrate 1. The positioning surface 22 is connected to the end of the guide surface 21 that is tilted downward and its shape is adapted to the shape of the adapter. After the adapter 20 is placed in the positioning area, it can abut against the positioning surface 22 and achieve positioning under the restriction of the positioning surface 22, so that the adapter 20 does not shift during welding.
[0038] In order to reduce the difficulty of processing, the positioning block 2 and the base plate 1 are integrally formed by injection molding.
[0039] In order to avoid the collision between the lower plastic part and the battery cell and the pole piece on the battery cell caused by vibration during battery transportation, the battery cell and the pole ear are damaged. The position where the air permeable groove 13 is set on the substrate 1 is raised to form an intermediate boss 14, and the two ends of the length of the substrate 1 are raised to form end bosses 15. The end boss 15 and the intermediate boss 14 are located on the same surface of the substrate 1 with the positioning component. The positioning component and the first through hole 11 are arranged between the end boss 15 and the intermediate boss 14. The height of the end boss 15 is the same as the height of the intermediate boss 14 or the height of the end boss 15 is less than the height of the intermediate boss 14. The height of the positioning block 2 is less than the height of the intermediate boss 14 to prevent contact with the battery cell and damage to the battery cell. Exemplarily, the height of the positioning block 2 is set at 5-8mm, wherein the height of the positioning surface 22 can be determined according to the thickness of the adapter 20, generally 0.5-2.0mm. It can be understood that the larger the inclination angle of the guide surface 21, the easier it is for the adapter 20 to slide down, but the range of the inclusive deviation will be reduced. On the contrary, the smaller the angle, the larger the range of the inclusive deviation, but the difficulty of sliding down increases. In this embodiment, the inclination angle of the guide surface 21 is set within the range of 30°-60°. The width of the guide surface 21 can be adjusted according to the inclination angle of the guide surface 21, and is generally set within the range of 2-5 mm.
[0040] In another embodiment of the utility model, a cover plate assembly is also proposed, including the above-mentioned lower plastic part, and also including a battery top cover 10, an explosion-proof valve 40 and a pole 30. The battery top cover 10 is arranged on the side of the lower plastic part facing away from the positioning assembly. A mounting hole 101 is arranged on the battery top cover 10 corresponding to the first through hole 11, and passes through the battery top cover 10 in the thickness direction. A liquid injection hole 102 is arranged on the battery top cover 10 corresponding to the second through hole 12, and passes through the battery top cover 10 in the thickness direction. An explosion-proof hole 103 is arranged on the position corresponding to the air-permeable groove 13, and the explosion-proof valve 40 is installed in the explosion-proof hole 103. It can be understood that the pole 30 includes a positive pole and a negative pole, and the positive pole and the negative pole pass through the mounting hole 101 and the first through hole 11 in turn to connect with the two adapters 20 positioned on the lower plastic part.
[0041] In another embodiment of the utility model, a battery is further provided, comprising the above-mentioned cover plate assembly, a battery cell and an adapter plate 20. The battery cell comprises a positive electrode ear and a negative electrode ear, and the positive electrode ear and the negative electrode ear are respectively welded to the positive electrode column and the negative electrode column in the cover plate assembly through two adapter plates 20. During welding, the cover plate assembly can be placed in a welding station first, and then the ultrasonically welded battery cell and adapter plate 20 are moved to the cover plate assembly, and the welding jig 50 presses on the top of the adapter plate 20. During this process, if the adapter plate 20 is offset or skewed, its edge will contact the guide surface 21 of the positioning block 2, and slide down along the guide surface 21 as the welding jig 50 is pressed down, and finally fall into the positioning area, and be positioned under the action of the positioning surface 22 to prevent it from being offset again. Reference Figure 4 As shown, the welding jig 50 is rectangular as a whole, and an avoidance groove 501 is set at the position corresponding to the middle boss 14 of the lower plastic sheet. At the same time, an avoidance hole 502 is also set at the position corresponding to the battery cell to press on the adapter plate 20 to assist the adapter plate 20 to enter the positioning area.
[0042] During the processing of the battery, the possibility of poor welding between the adapter 20 and the pole 30 is reduced, thereby improving the yield rate of the battery.
[0043] Figure 4 and Figure 5The structure of one of the adapter plates 20 is shown. The adapter plate 20 is U-shaped as a whole, and has an opening facing the other adapter plate 20. Both ends of the outside of the closed side of the adapter plate 20 are recessed inward to form a positioning groove 201. On this basis, only two positioning blocks 2 are provided in the positioning component. The two positioning blocks 2 are respectively located in the two positioning grooves 201 of the adapter plate 20 to achieve the restriction of the forward and reverse directions of the adapter plate 20 in the first direction and the forward and reverse directions in the second direction. Of course, more than two positioning blocks 2 can also be provided in the positioning component, for example, four positioning blocks 2 are provided, wherein two positioning blocks 2 are provided in the two positioning grooves 201 of the adapter plate 20, and the other two positioning blocks 2 are provided in the U-shaped opening of the adapter plate 20, so as to further improve the stability of the adapter plate 20 in the positioning area.
[0044] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.
Claims
1. The lower plastic part is characterized by: include: A substrate (1), wherein the substrate (1) is provided with a first through hole (11) for the pole (30) to pass through; A positioning component is arranged on the peripheral side of the first through hole (11), the positioning component can position the adapter plate (20) along the first direction and the second direction, the positioning component comprises a plurality of positioning blocks (2), the plurality of positioning blocks (2) surround a positioning area on the substrate (1) for placing the adapter plate (20), and the top surface of the positioning block (2) is provided with a guide surface (21) extending downwardly and obliquely toward the positioning area; The first direction and the second direction are perpendicular.
2. The lower plastic part according to claim 1, characterized in that: The side of the positioning block (2) facing the positioning area is arranged as a positioning surface (22) perpendicular to the surface of the substrate (1), and the positioning surface (22) is connected to an end of the guide surface (21) that is inclined downward.
3. The lower plastic part according to claim 2, characterized in that: The height of the positioning surface (22) is 0.5-2.0 mm.
4. The lower plastic part according to claim 1, characterized in that: The positioning block (2) and the base plate (1) are integrally formed by injection molding.
5. The lower plastic part according to claim 1, characterized in that: The base plate (1) is provided with an intermediate boss (14) and an end boss (15), and the positioning assembly is located between the intermediate boss (14) and the end boss (15).
6. The lower plastic part according to claim 1, characterized in that: The height of the positioning block (2) is 5-8 mm.
7. The lower plastic part according to claim 1, characterized in that: The inclination angle of the guide surface (21) is 30°-60°.
8. A cover plate assembly, characterized in that: The battery top cover (10) comprises a battery top cover (10), a pole (30) and a lower plastic part as claimed in any one of claims 1 to 7, wherein the battery top cover (10) is arranged on a side of the lower plastic part facing away from the positioning assembly, and a mounting hole (101) is arranged on the battery top cover (10) at a position corresponding to the first through hole (11), and the pole (30) passes through the mounting hole (101) and the first through hole (11) in sequence.
9. A battery, characterized in that It comprises a battery cell, a transfer sheet (20) and a cover plate assembly as claimed in claim 8, wherein the battery cell is provided with a positive electrode ear and a negative electrode ear, and the electrode column (30) comprises a positive electrode column and a negative electrode column, and the positive electrode ear and the negative electrode ear are respectively connected to the positive electrode column and the negative electrode column through two transfer sheets (20).
10. The battery according to claim 9, characterized in that The adapter plate (20) is provided with two inwardly recessed positioning grooves (201), and the two positioning blocks (2) are respectively arranged in the two positioning grooves (201).