Lithium ion battery case with prefabricated burrs on bottom and lithium ion battery preparation method
A lithium-ion battery and shell technology, which is used in the manufacture of electrolyte batteries, battery pack components, non-aqueous electrolyte batteries, etc., to achieve the effects of reducing internal resistance, improving welding strength, and improving comprehensive electrical performance
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preparation example Construction
[0027] likefigure 1 , figure 2 Shown, a kind of preparation method of lithium ion battery comprises the following steps:
[0028] 1) Preparation of the lithium-ion battery case with prefabricated burrs at the bottom: During the deep-drawing process of the lithium-ion battery case, a concave hole of a certain shape is pre-processed on the top of the punch of the forming die, and after deep-drawing, the lithium-ion battery can be formed. Protruding burrs 2 of a certain shape are processed inside the boss 11 at the bottom of the shell 1 to obtain a lithium-ion battery shell 1 with prefabricated burrs 2 at the bottom;
[0029] 2) Weld the lithium-ion battery case 1 with the prefabricated burr 2 on the bottom with the tab 3 on the battery cell, and the welding head 4 is close to the burr 2 at the bottom of the lithium-ion battery case 1, so that the tab 3 is in contact with the bottom burr 2 During the welding process, a large current is discharged through the burr 2, which can e...
Embodiment 1
[0032] like figure 1 As shown, the lithium-ion battery casing with prefabricated burrs at the bottom (that is, the 18650 steel casing for lithium-ion power batteries with prefabricated burrs), including the lithium-ion battery casing 1, the specific dimensions of the lithium-ion battery casing 1 are shown in Table 1, where the unit In mm, the outer diameter and inner diameter are diameters.
[0033] Table 1
[0034] model
Outer diameter ±0.05
Inner diameter ±0.05
Height ±0.1
Shell wall thickness ±0.02
Boss diameter
18650
18
17.52
66.9
0.24
13.5
[0035] Burrs 2 are provided on the inside of the bottom of the lithium-ion battery case 1 (that is, the side used to connect with the tab on the battery cell). The bottom of the lithium-ion battery case 1 faces outwards (that is, the direction along the bottom of the lithium-ion battery case 1 away from the burrs) forms a boss 11 , and the burrs 2 are arranged on the in...
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