Lower plastic part, cover plate assembly and single battery
By designing the buffer boss and buffer groove structure of the lower plastic part, the problem of electrolyte impact on the bare cell was solved, the uniform penetration of electrolyte and the improvement of injection efficiency were achieved, and the reliability of the single cell was improved.
Patent Information
- Application Number
- CN202423049910.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-11
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2034-12-11
AI Technical Summary
During the electrolyte filling process, the electrolyte exerts a strong impact on the bare cell, causing the positive and negative electrode plates to separate, which affects the energy density and service life.
Design a lower plastic part, including a buffer boss and a buffer groove. The buffer boss surrounds the outer edge of the injection hole, and the buffer groove is provided with an injection gap and a guide hole. The electrolyte is buffered by the buffer groove and then evenly penetrates into the bare battery cell.
It reduces the impact of the electrolyte injection process on the bare cells, improves the electrolyte penetration efficiency and injection efficiency, and enhances the reliability of individual cells.
Smart Images
Figure CN223743863U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to battery technology field especially relates to a lower plastic part, cover plate subassembly and single battery. BACKGROUND
[0002] The square lithium ion battery includes a battery shell, a bare cell placed in the battery shell, and a top cover assembly capped on the battery shell. After the lithium ion battery is assembled, helium detection, electrolyte injection and other processes are required, which are carried out through the liquid injection hole on the top cover assembly. During the electrolyte injection or helium detection, the internal space of the battery becomes more and more compact, the distance between the liquid injection hole and the bare cell becomes closer and closer, and the liquid injection process of the battery generates a large pressure, which directly impacts the bare cell. At this time, the impact force on the bare cell is large, which can easily cause the positive and negative plates near the liquid injection hole to separate, affecting the energy density and service life of the bare single battery.
[0003] Therefore, there is an urgent need to provide a new lower plastic part, cover plate subassembly and single battery to solve the above technical problems in the prior art. SUMMARY
[0004] One purpose of the utility model is to provide a lower plastic part that can alleviate the impact force generated directly on the bare cell during the liquid injection process and can guide the electrolyte to uniformly penetrate into the bare cell, thereby improving the liquid injection efficiency.
[0005] To achieve this purpose, the utility model adopts the following technical solutions:
[0006] The lower plastic part includes a lower plastic body and a buffer boss. The lower plastic body has a pouring hole opposite to the liquid injection hole of the battery cover plate. The buffer boss is arranged on the bottom wall of the lower plastic body and protrudes away from the lower plastic body. The buffer boss surrounds the outer edge of the pouring hole. The end of the buffer boss close to the lower plastic body in the vertical direction has a buffer groove communicating with the pouring hole. The inner bottom wall of the buffer groove is provided with a liquid injection gap communicating with the pouring hole and the internal space of the single battery.
[0007] Optionally, the inner bottom wall of the buffer groove is provided with a protruding portion facing the pouring hole. The liquid injection gap is arranged in the protruding portion.
[0008] Optionally, the top wall of the protruding portion is a spherical surface, a conical surface or a stepped surface protruding towards the pouring hole.
[0009] Optionally, the liquid injection gap is provided with a plurality of liquid injection gaps, and the plurality of liquid injection gaps are arranged in cross.
[0010] Optionally, a weakening groove is arranged on the bottom wall of the buffer boss and opposite to the protruding part, and the opening of the weakening groove faces away from the lower plastic body.
[0011] Optionally, the inner axial sidewall of the buffer groove is provided with a flow guide hole communicating with the pouring hole and the internal space of the single battery.
[0012] Optionally, a plurality of flow guide holes are arranged, and the plurality of flow guide holes are uniformly and circumferentially spaced.
[0013] Optionally, the buffer boss is integrally formed with the lower plastic body.
[0014] Another purpose of the utility model is to provide a cover plate assembly, which comprises a battery cover plate and a lower plastic part according to any one of the above solutions, and the pouring hole of the lower plastic body is opposite to the liquid injection hole of the battery cover plate.
[0015] Still another purpose of the utility model is to provide a single battery, which comprises the cover plate assembly according to the above solution.
[0016] Beneficial effects:
[0017] The lower plastic part in the utility model comprises a lower plastic body and a buffer boss, the lower plastic body is provided with a pouring hole opposite to a liquid injection hole of a battery cover plate, when electrolyte is poured, the electrolyte flows into the pouring hole from the liquid injection hole, and then flows into the battery, in this process, the electrolyte first fills the buffer groove arranged on the buffer boss, and then gradually flows into the battery from the liquid injection gap arranged on the inner bottom wall of the buffer groove, so that the electrolyte injection of the single battery is realized, the electrolyte directly impacts the bare battery cell in the single battery is avoided, the bare battery cell can be fully soaked, and the electrolyte injection efficiency and use reliability of the single battery are improved. The lower plastic part can relieve the impact force directly generated on the bare battery cell during the electrolyte injection process, can guide the electrolyte to uniformly penetrate into the bare battery cell, and improve the electrolyte injection efficiency. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 is a longitudinal sectional view of the cover plate assembly provided by the embodiment of the utility model;
[0019] Figure 2 is Figure 1 is a local enlarged view of A in Fig.
[0020] Figure 3 is an axonometric view of the lower plastic part provided by the embodiment of the utility model.
[0021] In the drawings:
[0022] 100, battery cover plate; 110, liquid hole; 200, lower plastic body; 210, pouring hole; 300, buffer boss; 310, buffer groove; 311, liquid injection gap; 312, protruding part; 320, weakening groove; 330, flow guide hole. DETAILED DESCRIPTION
[0023] The utility model will be described in further detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, and not to limit the utility model. In addition, it should be noted that, for the convenience of description, only the parts related to the utility model are shown in the drawings, not all the structures.
[0024] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0025] In the utility model, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.
[0026] In the description of the embodiment, the terms "up", "down", "right", etc. orientation or position relationship is based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.
[0027] Please refer to Figures 1 to 3The lower plastic part in the embodiment includes a lower plastic body 200 and a buffer boss 300. The lower plastic body 200 is provided with a pouring hole 210 opposite to the liquid injection hole 110 of the battery cover plate 100. The buffer boss 300 is arranged on the bottom wall of the lower plastic body 200 and protrudes away from the lower plastic body 200. The buffer boss 300 surrounds the outer edge of the pouring hole 210. The end of the buffer boss 300 close to the lower plastic body 200 in the vertical direction is provided with a buffer groove 310 communicating with the pouring hole 210. The inner bottom wall of the buffer groove 310 is provided with a liquid injection gap 311 communicating with the pouring hole 210 and the internal space of the single battery.
[0028] The lower plastic part in the embodiment includes a lower plastic body 200 and a buffer boss 300. The lower plastic body 200 is provided with a pouring hole 210 opposite to the liquid injection hole 110 of the battery cover plate 100. When electrolyte is poured, the electrolyte flows into the pouring hole 210 from the liquid injection hole 110 and then enters the battery. In this process, the electrolyte first fills the buffer groove 310 arranged on the buffer boss 300, and then gradually flows into the battery from the liquid injection gap 311 arranged on the inner bottom wall of the buffer groove 310, thereby realizing electrolyte injection of the single battery, avoiding direct impact of the electrolyte on the bare battery cell in the single battery, and fully soaking the bare battery cell, thereby improving the electrolyte injection efficiency and use reliability of the single battery. The lower plastic part can relieve the impact force directly generated on the bare battery cell during the electrolyte injection process, and can guide the electrolyte to uniformly penetrate into the bare battery cell, thereby improving the electrolyte injection efficiency.
[0029] Further, the inner bottom wall of the buffer groove 310 is provided with a protruding portion 312 protruding towards the pouring hole 210, and the liquid injection gap 311 is arranged on the protruding portion 312. When electrolyte needs to be poured, the electrolyte first impacts the protruding portion 312 arranged on the inner bottom wall of the buffer groove 310. The protruding portion 312 buffers the electrolyte, avoids splashing of the electrolyte when the electrolyte impacts the buffer groove 310, avoids leakage of the electrolyte, and improves the reliability of the electrolyte injection process.
[0030] In the embodiment, the top wall of the protruding portion 312 is a spherical surface, a conical surface or a stepped surface protruding towards the pouring hole 210. Regardless of the spherical surface, the conical surface or the stepped surface, the electrolyte can be buffered, and splashing of the electrolyte can be avoided. In the embodiment, preferably, the top wall of the protruding portion 312 is a spherical surface. The spherical surface is relatively smooth and has a relatively low height, which can better buffer the electrolyte and avoid accumulation of part of the electrolyte on the top wall of the protruding portion 312.
[0031] As Figure 2 and Figure 3As shown, the liquid injection gap 311 is provided with multiple, and multiple liquid injection gap 311 is provided with intersection. In this embodiment, the liquid injection gap 311 is provided with two, two liquid injection gap 311 is crossed in the shape of "X"; or the liquid injection gap 311 is provided with 3, 3 liquid injection gap 311 is crossed in the shape of "*", in other optional embodiments, it can also be 4, 5, 6 and more, the intersection of multiple liquid injection gap 311 coincides with the center of the convex part 312, which will not be described here.
[0032] Optionally, a weakening groove 320 is arranged on the bottom wall of the buffer boss 300 and opposite to the convex part 312, and the opening of the weakening groove 320 faces away from the lower plastic body 200. The weakening groove 320 can weaken the mechanical strength of the convex part 312, and can press the convex part 312 downward and deform after the electrolyte impacts the convex part 312, thereby expanding the gap width of the liquid injection gap 311 and improving the liquid injection efficiency.
[0033] As shown in the figure, Figure 3 Further, the inner axial side wall of the buffer groove 310 is provided with a flow guide hole 330 communicating with the pouring hole 210 and the internal space of the single battery. The arrangement of the flow guide hole 330 enables the buffer groove 310 to not only inject liquid through the bottom liquid injection gap 311, but also flow into the single battery along the axial flow guide hole 330 of the buffer groove 310, thereby smoothly entering the single battery and further improving the liquid injection efficiency.
[0034] Optionally, the flow guide hole 330 is provided with multiple, and multiple flow guide holes 330 are uniformly distributed along the circumference. In this embodiment, the flow guide hole 330 is provided with 4, and the electrolyte can flow into the single battery from the 4 flow guide holes 330, thereby improving the liquid injection efficiency; and the electrolyte can be evenly dispersed into the single battery from the 4 flow guide holes 330, thereby avoiding the electrolyte continuously impacting a certain position of the bare battery during electrolyte pouring, avoiding excessive impact force on the bare battery, thereby improving the use reliability of the single battery.
[0035] In this embodiment, the buffer boss 300 and the lower plastic body 200 are integrally formed. On the one hand, the buffer boss 300 and the lower plastic body 200 are made of plastic, which jointly plays an insulating role; on the other hand, the buffer boss 300 and the lower plastic body 200 are made of the same material, which can make the molding and preparation of the lower plastic part more convenient, and can be directly integrally injection molded, without the need to increase new processes for the arrangement and installation of the buffer boss 300.
[0036] The embodiment also provides a cover plate assembly, which comprises the battery cover plate 100 and the lower plastic part as described in any of the above solutions, and the pouring hole 210 of the lower plastic body 200 is arranged opposite to the liquid injection hole 110 of the battery cover plate 100. The cover plate assembly has the beneficial effects of the lower plastic part as described in any of the above solutions, which will not be repeated here. The cover plate assembly can realize electrolyte injection of the single battery, avoid direct impact of the electrolyte on the bare cell in the single battery, relieve the impact force directly generated on the bare cell during the injection process, guide the electrolyte and thus uniformly penetrate into the bare cell, fully soak the bare cell, and improve the injection efficiency and use reliability of the single battery.
[0037] In addition, the embodiment also provides a single battery, which comprises the cover plate assembly as described in the above solutions. The single battery can improve the pouring efficiency of the electrolyte and avoid direct impact of the electrolyte on the bare cell, thereby improving the production efficiency and use reliability of the single battery, which will not be repeated here.
[0038] The single battery can be a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid (or lead-acid) battery, a lithium-ion battery, a polymer lithium-ion battery, etc. The single battery can also be a lithium-ion primary battery, a lithium-sulfur battery, a sodium lithium-ion battery, a sodium-ion battery or a magnesium-ion battery, etc., which will not be repeated here.
[0039] The embodiment also provides a power utilization device, which comprises the single battery as described in the above solutions. The power utilization device can be an electric bicycle, an electric vehicle, a hybrid vehicle, a ship, an energy storage device, etc., as long as it uses electric energy as an energy source, which will not be repeated here.
[0040] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not a limitation on the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.
Claims
1. A lower plastic part, characterized in that, The application relates to a lower plastic body (200) which is provided with a pouring hole (210) opposite to a liquid injection hole (110) of a battery cover plate (100). A buffer boss (300) is arranged on the bottom wall of the lower plastic body (200) and protrudes away from the lower plastic body (200), the buffer boss (300) surrounds the outer edge of the pouring hole (210), and the end of the buffer boss (300) close to the lower plastic body (200) in the vertical direction is provided with a buffer groove (310) in communication with the pouring hole (210), and the inner bottom wall of the buffer groove (310) is provided with liquid injection gaps (311) in communication with the pouring hole (210) and the internal space of a single battery. The inner bottom wall of the buffer groove (310) is provided with a protruding part (312) protruding towards the pouring hole (210), and the liquid injection gaps (311) are arranged on the protruding part (312).
2. The lower plastic part of claim 1, wherein, The top wall of the protruding part (312) is a spherical surface, a conical surface or a stepped surface protruding towards the pouring hole (210).
3. The lower plastic part of claim 2, wherein, The liquid injection gaps (311) are arranged in plurality, and the liquid injection gaps (311) are arranged in cross.
4. The lower plastic part of claim 2, wherein, A weakening groove (320) is arranged on the bottom wall of the buffer boss (300) and opposite to the protruding part (312), and the opening of the weakening groove (320) is away from the lower plastic body (200).
5. The lower plastic part of claim 2, wherein, The inner axial side wall of the buffer groove (310) is provided with flow guide holes (330) in communication with the pouring hole (210) and the internal space of the single battery.
6. The lower plastic part of claim 1, wherein, The flow guide holes (330) are arranged in plurality, and the flow guide holes (330) are uniformly and interval distributed in the circumferential direction.
7. The lower plastic part of claim 6, wherein, The buffer boss (300) is integrally formed with the lower plastic body (200).
8. The lower plastic part according to any one of claims 1-7, wherein, The application relates to a battery cover plate (100) and the lower plastic part as claimed in any one of claims 1-8, and the pouring hole (210) of the lower plastic body (200) is arranged opposite to the liquid injection hole (110) of the battery cover plate (100).
9. A cover assembly characterized by, The application relates to a cover plate assembly as claimed in claim 9.
10. A single cell characterized by