Lithium battery shell structure

Abstract

The utility model relates to a lithium battery shell structure, including bottom box and the surface cover of covering on bottom box, the upper end surface of bottom box is equipped with the annular bottom box part insertion groove of extending along the circumference of bottom box, the circumference of surface cover is equipped with the underflap, the underflap's lower end surface is equipped with the annular surface cover part insertion piece of surface cover extension, surface cover part insertion piece inserts in bottom box part insertion groove, surface cover part insertion piece is connected in bottom box part insertion groove through glue seal. The utility model aims at providing a lithium battery shell structure which does not need to invert the battery for curing and then vertically place back when sealing assembly, solves the problem that the existing battery shell needs to invert for sealing and is inconvenient and laborsaving.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a lithium battery casing structure. Background Technology

[0002] A lithium battery is a battery whose electrochemical system contains lithium (including metallic lithium, lithium alloys, lithium ions, and lithium polymers). Lithium batteries can be broadly classified into two categories: lithium metal batteries and lithium-ion batteries. Lithium metal batteries are typically non-rechargeable and contain metallic lithium. Lithium-ion batteries do not contain metallic lithium and are rechargeable. In use, multiple lithium batteries are connected in series and parallel and housed in a casing to form a lithium battery with the required voltage and capacity. Current lithium battery casings are sealed by creating a sealing groove in the lid and a sealing tongue in the bottom. The lid is inverted, sealant is injected into the sealing groove, the bottom casing containing the battery cells is inverted, and the sealing tongue is inserted into the sealing groove. After the sealant cures, the battery is flipped back into its original position. This process is laborious and inconvenient during assembly and sealing. Utility Model Content

[0003] The present invention aims to provide a lithium battery casing structure that eliminates the need to invert the battery for curing and then reposition it during sealing assembly, thus solving the problem of the laborious and inconvenient process of sealing existing battery casings by inverting them.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a lithium battery casing structure, characterized in that it includes a bottom box and a cover covering the bottom box, the upper surface of the bottom box is provided with an annular bottom box slot extending circumferentially along the bottom box, the periphery of the cover is provided with a downward flange, the lower end surface of the downward flange is provided with an annular cover insert extending circumferentially along the cover, the cover insert is inserted into the bottom box slot, and the cover insert is sealed in the bottom box slot by adhesive.

[0005] Preferably, the cover and the bottom box are fixed together by snap-fit. The outer side of the upper surface of the bottom box has a clearance notch. The snap-fit ​​includes a snap-fit ​​recess within the clearance notch and a snap-fit ​​head on the cover. The snap-fit ​​head engages with the snap-fit ​​recess to connect the cover and the bottom box. The snap-fit ​​design between the bottom box and the cover allows the cover and bottom box to remain in the desired position before the adhesive cures, ensuring a reliable connection.

[0006] Preferably, the system also includes a protective circuit board to prevent overcharging, over-discharging, and overheating during charging. The positive and negative output terminals are connected to the cover with their inner ends exposed on the inner surface of the cover. The cover has a downward-curved edge around its perimeter, and a first strip with a curved structure is provided on the inner surface of the cover. The two ends of the first strip are connected to the inner surface of the downward-curved edge to form a circuit board mounting cavity. Two circuit board positioning posts are provided on the bottom wall of the circuit board mounting cavity. The protective circuit board has two circuit board mounting holes, and the two circuit board positioning posts are inserted into the circuit board mounting holes one-to-one. The circuit board mounting holes and the positioning posts are interference-fitted to fix the protective circuit board in place. The positive output terminal of the protective circuit board is connected to the inner end of the positive output terminal via a positive wire, and the negative output terminal of the protective circuit board is connected to the inner end of the negative output terminal via a negative wire. This provides a method for fixing the protective circuit board and its connection to the output terminals. Fixing is convenient.

[0007] Preferably, a circuit board limiting strip is provided on the side wall of the circuit board mounting cavity. The circuit board limiting strip isolates the side wall of the protective circuit board from the side wall of the circuit board mounting cavity, forming a gap between the protective circuit board and the side wall of the circuit board mounting cavity. In use, the protective circuit board can be removed by reaching through the gap. Removing the protective circuit board is convenient.

[0008] Preferably, the bottom of the circuit board mounting cavity is provided with a supporting protrusion platform, and a clearance groove is formed between the supporting protrusion platform and the side wall of the circuit board mounting cavity. This facilitates the removal of the protective circuit board, allowing the communication channel to reach the clearance groove from the gap, and then pulling the protective circuit board out through the communication channel.

[0009] Preferably, the supporting protrusion platform has a through hole extending through the upper surface of the cover, which is covered by a cover plate. The upper surface of the cover has a cover plate sealing groove, and the cover plate is housed within this groove. A circuit board positioning post is disposed on the inner surface of the cover plate. Alternatively, the cover plate can be designed as a transparent structure and sealed with adhesive.

[0010] Preferably, the protective circuit board is provided with a disassembly through hole, which is aligned with at least one of the clearance groove and the through hole in the cover. In use, the protective circuit board can also be removed by inserting a hook into the disassembly through hole and pulling it.

[0011] Preferably, the cover plate clearance cavity is provided with an annular connecting groove extending circumferentially along the through hole of the cover plate at the location corresponding to the supporting protruding platform, and a cover plate connecting protrusion is provided on the inner surface of the cover plate, which passes through the annular connecting groove of the cover plate. This ensures reliable connection and good waterproofing.

[0012] Preferably, the inner surface of the side wall of the base box is provided with several vertical cell positioning partitions, which are distributed circumferentially around the base box. This allows the cells to be separated from the outer casing, improving the heat dissipation of the cells. This invention has the following advantages: it allows for easy disassembly and installation, enabling the cells to be removed for replacement; label replacement is convenient; and the protective circuit board connection is convenient and reliable. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the base box; Figure 3 for Figure 2 A magnified view of a portion of point A; Figure 4 This is a schematic diagram of the three-dimensional structure of the faceplate; Figure 5 A three-dimensional structural diagram of the front cover after the protective circuit board has been removed; Figure 6 for Figure 5 A magnified view of a portion of point B; Figure 7 This is a top view of the faceplate. Figure 8 A diagram illustrating the process of removing the cover plate and protective circuit board from the front cover; Figure 9 This is a schematic diagram of the cover plate. In the diagram: 2. Positive output terminal; 3. Negative output terminal; 4. Base box; 5. Cover; 6. Buckle; 7. Protective circuit board; 26. Clearance notch; 27. Buckle recess; 28. Buckle head; 29. ​​Base box slot; 30. Lower flange; 31. Cover plate insert; 32. First strip; 33. Circuit board mounting cavity; 34. Circuit board positioning post; 35. Circuit board limiting strip; 36. Support protrusion platform; 37. Clearance groove; 38. Cover through hole; 39. Cover plate sealant groove; 40. Disassembly through hole; 46. Cover annular connecting groove; 42. Cover connecting protrusion ring; 43. Cell positioning partition; 44. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model. See also... Figures 1 to 9A lithium battery casing structure includes a base box 4 and a cover 5 covering the base box, the cover and the base box being fixed together by a snap fastener 6. It also includes a protective circuit board 7 to prevent overcharging, over-discharging, and overheating during charging. The cover has a positive output terminal 2 and a negative output terminal 3. An clearance notch 26 is provided on the outer side of the upper surface of the base box. The snap fastener includes a snap fastener recess 27 disposed within the clearance notch and a snap fastener head 28 disposed on the cover. The snap fastener head engages with the snap fastener recess to connect the cover to the base box. The outer surface of the snap fastener head, the outer peripheral surface of the cover, and the outer peripheral surface of the base box are on the same plane. An annular base box slot 29 extending circumferentially from the base box is provided on the upper surface of the base box. A downward-curved edge 30 is provided around the periphery of the cover. An annular cover insert 31 extending circumferentially from the cover is provided on the lower surface of the downward-curved edge. The cover insert is inserted into the base box slot. The positive and negative output terminals are connected to the cover, with their inner ends exposed on the inner surface of the cover. A curved first strip 32 is provided on the inner surface of the cover. The two ends of the first strip connect to the inner surface of the down-flanged edge, forming a circuit board mounting cavity 33. Two circuit board positioning posts 34 are provided on the bottom wall of the circuit board mounting cavity. Two circuit board mounting holes are provided on the protective circuit board. The two circuit board positioning posts are inserted into the corresponding mounting holes. An interference fit is used between the mounting holes and the positioning posts to fix the protective circuit board in place. The positive output terminal of the protective circuit board is connected to the inner end of the positive output terminal via a positive wire (not shown in the figure), and the negative output terminal of the protective circuit board is connected to the inner end of the negative output terminal via a negative wire (not shown in the figure). A circuit board limiting strip 35 is provided on the side wall of the circuit board mounting cavity, isolating the protective circuit board from the side wall of the circuit board mounting cavity, creating a gap between them. A support protrusion platform 36 is provided at the bottom of the circuit board mounting cavity, and a clearance groove 37 is formed between the support protrusion platform and the side wall of the circuit board mounting cavity. The support protrusion platform has a cover part through hole 38 that penetrates the upper surface of the cover. The cover part through hole is covered by a cover plate 39. A cover plate sealing groove 40 is provided on the upper surface of the cover. The cover plate is accommodated in the cover plate sealing groove. A circuit board positioning post is set on the inner surface of the cover plate. The protective circuit board is provided with a disassembly through hole 46, which is aligned with at least one of the clearance groove and the cover through hole (in this embodiment, two disassembly through holes are provided, and the two disassembly through holes are aligned with the clearance groove and the cover through hole respectively). The cover clearance cavity is provided with a cover annular connecting groove 42 extending circumferentially along the cover through hole at the part corresponding to the support protruding platform. The inner surface of the cover is provided with a cover connecting protrusion 43 that passes through the cover annular connecting groove. The inner surface of the side wall of the bottom box is provided with a plurality of vertical cell positioning partitions 44, which are distributed circumferentially along the bottom box.

Claims

1. A lithium battery case structure, characterized by, The device includes a bottom box and a cover that covers the bottom box. The upper surface of the bottom box has an annular bottom box slot that extends circumferentially along the bottom box. The periphery of the cover has a downward-curved edge. The lower surface of the downward-curved edge has an annular cover insert that extends circumferentially along the cover. The cover insert is inserted into the bottom box slot and is sealed in the bottom box slot with adhesive.

2. The lithium battery case structure according to claim 1, wherein The cover and the bottom box are fixed together by a snap fastener. The outer side of the upper surface of the bottom box is provided with an avoidance notch. The snap fastener includes a snap fastener recess provided in the avoidance notch and a snap fastener head provided on the cover. The snap fastener head is engaged in the snap fastener recess to connect the cover and the bottom box together.

3. The lithium battery case structure according to claim 2, wherein The outer surface of the buckle head, the outer peripheral surface of the cover, and the outer peripheral surface of the bottom box are located on the same surface.

4. The lithium battery case structure according to claim 1 or 2 or 3, wherein It also includes a protective circuit board to prevent overcharging, over-discharging, and overheating during charging. The positive and negative output terminals are connected to the cover and their inner ends are exposed on the inner surface of the cover. The cover has a downward-curved edge around its perimeter. The inner surface of the cover has a first strip with a curved structure. The two ends of the first strip are connected to the inner surface of the downward-curved edge to form a circuit board mounting cavity. The bottom wall of the circuit board mounting cavity has two circuit board positioning posts. The protective circuit board has two circuit board mounting holes. The two circuit board positioning posts are inserted into the circuit board mounting holes one-to-one. The circuit board mounting holes and the positioning posts are interference-fitted to fix the protective circuit board. The positive output terminal of the protective circuit board is connected to the inner end of the positive output terminal through a positive wire. The negative output terminal of the protective circuit board is connected to the inner end of the negative output terminal through a negative wire.

5. The lithium battery case structure according to claim 4, wherein The circuit board mounting cavity has a circuit board limiting strip on its side wall. The circuit board limiting strip is isolated between the side wall of the protective circuit board and the side wall of the circuit board mounting cavity, and a gap is formed between the protective circuit board and the side wall of the circuit board mounting cavity.

6. The lithium battery case structure according to claim 5, wherein The bottom of the circuit board mounting cavity is provided with a support protrusion platform, and a clearance groove is formed between the support protrusion platform and the side wall of the circuit board mounting cavity.

7. The lithium battery case structure according to claim 6, wherein The supporting protrusion platform has a through hole in the cover portion that penetrates the upper surface of the cover. The through hole in the cover portion is covered by a cover plate. The upper surface of the cover has a cover plate sealing groove. The cover plate is accommodated in the cover plate sealing groove. A circuit board positioning post is set on the inner surface of the cover plate.

8. The lithium battery case structure according to claim 7, wherein The protective circuit board is provided with a disassembly through hole, which is aligned with at least one of the relief groove and the through hole of the cover.

9. The lithium battery case structure of claim 7, wherein The cover plate clearance cavity is provided with a cover plate annular connecting groove extending circumferentially along the cover plate through hole at the location corresponding to the supporting protruding platform. The inner surface of the cover plate is provided with a cover plate connecting protrusion passing through the cover plate annular connecting groove.

10. The lithium battery case structure according to claim 1 or 2 or 3, wherein The inner surface of the side wall of the bottom box is provided with several vertical cell positioning partitions, which are distributed along the circumference of the bottom box.

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