Battery housing and battery

A battery housing for a button battery, comprising:

• a cup-shaped bottom shell, the cup-shaped bottom shell comprising a circular or oval bottom wall and an annular side wall, and the cup-shaped bottom shell defining a receiving opening;
• and
• a cover configured to seal the receiving opening, the cover comprising an outer contact layer, an insulating layer, and an inner contact layer from outside to inside;
• the inner contact layer comprising an outer electrical connecting portion, an electrode connecting portion, and a conductive bonding portion;
• the insulating layer comprising an insulating bonding portion and an insulating opening portion;
• the outer contact layer comprising a welding portion, a welding bonding portion, and a welding opening portion;
• the side wall comprising a welding support portion close to the receiving opening, wherein a maximum outer diameter of the outer contact layer is D1, a maximum outer diameter of the inner contact layer is D2, and D1 is greater than D2, wherein both D1 and D2 are measured in millimeters (mm);
• wherein the electrode connecting portion is located on a surface of the inner contact layer facing towards an inner side of the battery housing, the electrode connecting portion is configured to be electrically connected to a pole of a battery cell to enable the inner contact layer to be electrically connected to the battery cell;
• the outer electrical connecting portion is configured to pass through the insulating opening portion and the welding opening portion to be electrically connected to an outer device;
• the conductive bonding portion is configured to be seamlessly bonded to the insulating bonding portion, to enhance a strength of the cover and reduce a direct contact area between the insulating bonding portion and an inner side of the battery housing, and to prevent external water from permeating into the battery housing;
• the welding portion is configured to be welded with the welding supporting portion, thereby enabling the cover and the bottom shell to be sealed;
• the welding bonding portion is configured to enhance the strength of the cover and prevent external water from permeating into the battery housing;
• wherein the insulating bonding portion is configured to be seamlessly bonded to the conductive bonding portion and the welding bonding portion by melting an insulating anti-electrolyte corrosion material ay ≥100° C. before the cover and the bottom shell are sealed, the insulating anti-electrolyte corrosion material is one or more selected from polypropylene (PP), a copolymer of a small amount of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene (PFA), polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), ethylene-tetrafluoroethylene copolymer (ETFE), and polyvinyl chloride (PVC), and the insulating anti-electrolyte corrosion material has a thermal shrinkage rate of 6%, and a bonding strength, between the insulating bonding portion and the conductive bonding portion or between the insulating bonding portion and the welding bonding portion, is greater than or equal to 1.0 N per square millimeter after the insulating anti-electrolyte corrosion material is at a room temperature;
• a thickness of the insulating bonding portion is D3, and D3 is 0.01 mm-2.5 mm;
• the contact area between the insulating bonding portion and the inner side of the battery housing is S0, and S0 satisfies:
• S0≥π*D2*D3*½, wherein π is a mathematical constant pi;
• the outer contact layer is made of stainless steel, and a thickness of the outer contact layer is D4 and D4 is 0.1 mm-0.25 mm;
• and/or the inner contact layer is made of stainless steel, and a thickness of the inner contact layer is D5 and D5 is 0.1 mm-0.25 mm.