Abstract: A negative electrode plate is provided, which includes a current collector, and a first negative electrode active material layer and a second negative electrode active material layer sequentially arranged on the current collector. A tortuosity of the first negative electrode active material layer and a tortuosity of the second negative electrode active material layer satisfy: 1<t1?5, 1<t2?5, and 0.5?t2?t1?3.2; where t1 represents the tortuosity of the first negative electrode active material layer, t2 represents the tortuosity of the second negative electrode active material layer, and t2?t1 represents a difference between the tortuosity of the second negative electrode active material layer and the tortuosity of the first negative electrode active material layer.

Abstract: An electronic device includes a computer, a circuit board, a supporting base attached to a top surface of the circuit board, and a backboard attached to a bottom surface of the circuit board. The case includes a bottom plate. The circuit board defines a through hole. A CPU is located on the supporting base. The backboard defines a retaining hole. The supporting base defines a fixing hole. A heat sink is attached to the supporting base and contacted the CPU. A fixing member is engaged with the retaining hole, the fixing hole and the through hole, to engage the backboard and the supporting base to the circuit board.

Abstract: An electronic device includes a mounting plate, a front panel, and an identifier film. A mounting bracket is mounted on the mounting plate. An indicating device is secured in the mounting bracket. The front panel is secured on the mounting plate. The front panel defines a light emitting hole aligned with the indicating device. The identifier film is attached on the front panel to cover the light emitting hole. Light emitted by the indicating device emits through an identifier of the identifier film.

Abstract: A cable management apparatus includes a plate and a cable management clip. The plate defines an opening for a plurality of cables extending therethrough. The cable management clip is connected to an edge of the opening. The cable management clip includes a blocking piece. A width of blocking piece is larger than a width of the opening. The blocking piece is attracted on the plate to restrict the plurality of cables between the plate and the cable management clip.

Abstract: A fan mounting assembly includes a mounting tray and a fan. The mounting tray includes a base plate and at least one mating block protruding from the base plate. The fan includes a housing and a blade accommodated in the housing. The blade is configured to blow air from a first side of the fan to a second side of the fan. The fan having a mating surface located at the second side and mated with the at least one mating block.

Abstract: A mounting apparatus for mounting an I/O connector includes a base having a chamber for accommodating the I/O connector, a cover engaged with the base thereby fixing the I/O connector in the chamber, a shielding case for receiving the base and the cover, and a resilient piece having a first end abutting the shielding case and a second end abutting a housing of the I/O connector.

Abstract: A fan assembly includes a bracket and a fan module. The bracket includes a ventilation plate. A limiting portion protrudes from the ventilation plate. The fan module is secured to the ventilation plate and includes a frame and a plurality of fan blades. The frame includes a first sidewall and a second sidewall opposite to the first sidewall. The plurality of fan blades are received in the frame, and each of the plurality of fan blades includes a first edge adjacent to the first sidewall and a second edge adjacent to the second sidewall. A height of the limiting portion is greater than a distance between the first edge and the first sidewall and smaller than a distance between the second edge and the second sidewall.

Abstract: A computing device includes a first motherboard and a second motherboard perpendicularly attached to the first motherboard. The first motherboard includes a first CPU module and a plurality of first peripheral component interconnect (PCI) sockets. The second motherboard includes a second CPU module and a plurality of second PCI sockets. The plurality of first PCI sockets is located perpendicularly to both motherboards. The plurality of second PCI sockets includes at least one PCI socket that is obliquely oriented relative to the first motherboard.

Abstract: A circuit board assembly includes a circuit board, a latch member attached to the circuit board, and a protective shielding member for accommodating the circuit board and the latch member. The circuit board includes a main board and a connector attached to the main board. At least one mounting hole is defined in the main board. At least one pin protrudes from the main board. The latch member includes a main panel abutting the main board, at least one engaging post engaging with the at least one mounting hole, and a covering portion for covering the at least one pin. Main portions of the main board and the main panel are received in the shielding member. The connector and the covering portion are exposed on the outside of the shielding member.

Abstract: A circuit board module includes a first circuit board and a protecting cover. A high speed interface is located on the first circuit board, for receiving a second circuit board. The high speed interface defines two latch slots. The protecting cover includes a cover body and a knob located on the cover body. The knob includes two resilient pieces and two latch tabs. The two latch tabs are located on the two resilient pieces, respectively. When the second circuit board is not connected to the high speed interface, the cover body covers the first high speed interface. Each of the two latch tabs is engaged in each of the two latch slots, to prevent the cover body from moving away the high speed interface. The two resilient pieces are resiliently deformable to disengage each of the two latch tabs from each of the latch slots.

Abstract: A mounting apparatus for mounting an I/O connector includes a base having a chamber for accommodating the I/O connector, a cover engaged with the base thereby fixing the I/O connector in the chamber, a shielding case for receiving the base and the cover, and a resilient piece having a first end abutting the shielding case and a second end abutting a housing of the I/O connector.

Abstract: A fan assembly includes a bracket and a fan module. The bracket includes a ventilation plate. A limiting portion protrudes from the ventilation plate. The fan module is secured to the ventilation plate and includes a frame and a plurality of fan blades. The frame includes a first sidewall and a second sidewall opposite to the first sidewall. The plurality of fan blades are received in the frame, and each of the plurality of fan blades includes a first edge adjacent to the first sidewall and a second edge adjacent to the second sidewall. A height of the limiting portion is greater than a distance between the first edge and the first sidewall and smaller than a distance between the second edge and the second sidewall.

Abstract: A fan module includes a fan body and a cover. The fan body defines a mounting hole. The cover is secured to the fan body and includes a spoke and a hook extending from the spoke. The hook includes a connecting portion and an elastically deformable latching portion. The connecting portion is connected to the spoke. The elastically deformable latching portion extends from the connecting portion. The connecting portion is received in the mounting hole. The elastically deformable latching portion is engaged with the fan body.

Abstract: A connector assembly includes a first connector with a positioning portion and a second connector with a latch. A blocking portion is located on a second side of the first connector. The latch defines an oblique latching plane, the positioning portion defines an oblique sliding plane, and the blocking portion defines an oblique blocking plane. If the latch is aligned with the positioning portion and is slid towards the first connector, the oblique direction of the second latching plane is substantially the same as the oblique positioning plane. If the latch is aligned with the blocking portion and is slid towards the first connector, an acute angle is defined between the oblique direction of the second latching plane and the oblique direction of the blocking plane.

Abstract: A mounting assembly includes a fan and a plate. The fan includes a number of locking pins. The plate defines a ventilation area corresponding to the fan. A number of securing holes are defined by the plate adjacent to a corner of the ventilation area. Two or more raised blocks are located on the plate and adjacent an edge of the ventilation area. The locking pins of the fan are slid into the securing hole and at the limit of the securing hole the raised blocks abut an edge of the fan to prevent the fan moving back out of the securing hole.

Abstract: A packing apparatus includes a case for receiving a plurality of electronic devices and a plurality of mounting members placed in the case. Each mounting member defines a receiving space. A shock-absorbing member is located in the receiving space and divides the receiving space into two mounting spaces. A shock-absorbing block is located in each mounting space. A slot is defined between the shock-absorbing block and the shock-absorbing member. A side of the shock-absorbing block towards the shock-absorbing member defines an oblique plane as a cushioning surface, and the oblique plane abuts the shock-absorbing member when the shock-absorbing member is bent.

Abstract: An electronic device includes a sidewall, a mounting bracket, an expansion card, and a connector. The mounting bracket is mounted to the sidewall. The mounting bracket includes a cover portion, a plurality of retaining members located on the cover portion, and a guiding channel defined between two adjacent retaining members of the plurality of retaining members. The expansion card includes a mounting tab located in the guiding channel. The connector is mounted on one of the plurality of the retaining members and is removable for connecting to the expansion card.

Abstract: A computing device includes a first motherboard and a second motherboard perpendicularly attached to the first motherboard. The first motherboard includes a first CPU module and a plurality of first peripheral component interconnect (PCI) sockets. The second motherboard includes a second CPU module and a plurality of second PCI sockets. The plurality of first PCI sockets is located perpendicularly to both motherboards. The plurality of second PCI sockets includes at least one PCI socket that is obliquely oriented relative to the first motherboard.

Abstract: An expansion card and a computer system with the expansion card are disclosed. The expansion card includes a card body, and a mounting member includes a base and a support extending from the base. The base is fixed to the card body and defines a first plane facing the card body. The support defines an edge substantially extending from the base. An angle defined between the edge and the first plane is not less than about 30 degrees, but not more than about 60 degrees.

Abstract: An electronic device includes a computer, a backboard, a circuit board attached to the backboard, and a supporting base attached to the top surface of the circuit board. The computer case includes a bottom plate. The backboard is attached to the bottom plate. The backboard and the supporting base engage with the circuit board, and the backboard is located between the bottom plate and the circuit board, to prevent the circuit board from contacting the bottom plate.