Disclosed herein relates to a secondary battery, which in one example includes a housing made of metal, at least one battery cell within the housing, and a coolant, wherein the housing includes an inner surface facing the at least one battery cell and an outer surface spaced apart from the inner surface, and wherein the coolant is stored in a hollow portion formed between the inner surface and the outer surface.

A battery cell includes a cell body and a housing. The housing defines an accommodation cavity. The cell body is accommodated in the accommodation cavity. The housing includes an injection port communicating with the accommodation cavity. The battery cell further includes: a sealing pin, vertically mounted at the injection port and fixed to the housing. The sealing pin includes a first through-hole, and the first through-hole communicates with the accommodation cavity; a thermally deformable piece, filling in the first through-hole and fixed to the sealing pin; and an elastic element. The elastic element includes a second through-hole and is set around the sealing pin through the second through-hole and fixed to the injection port. The thermally deformable piece deforms when a temperature is higher than a preset threshold, so that a pressure relief channel communicating with both ends of the first through-hole is formed in the first through-hole.

A battery cell includes a cell body and a housing. The housing defines an accommodation cavity. The cell body is accommodated in the accommodation cavity. The housing includes an injection port communicating with the accommodation cavity. The battery cell further includes: a sealing pin, vertically mounted at the injection port and fixed to the housing. The sealing pin includes a first through-hole, and the first through-hole communicates with the accommodation cavity; a thermally deformable piece, filling in the first through-hole and fixed to the sealing pin; and an elastic element. The elastic element includes a second through-hole and is set around the sealing pin through the second through-hole and fixed to the injection port. The thermally deformable piece deforms when a temperature is higher than a preset threshold, so that a pressure relief channel communicating with both ends of the first through-hole is formed in the first through-hole.

An electrochemical energy store (10), comprising a housing (12) for accommodating at least one cell unit (24), wherein the housing (12) forms a receptacle space for the arrangement of the cell unit (24), wherein a surface (17) of the housing (12) facing the receptacle space is completely covered by an electrically insulating material (27), wherein the housing (12) also comprises an opening (20) for filling a fluid electrolyte into the receptacle space, and wherein the opening (20) is covered by two overlapping end regions (26, 28) of the electrically insulating material (27). An energy store (10) according to the invention permits a simple means of bringing about sealed internal insulation of a housing (12) accompanied by simultaneously improved manufacturability.

A degassing method for a lithium battery cell includes the following steps: providing a lithium battery cell including a sealed bag, a degassing tube is arranged on the sealed bag and an end of the degassing tube is communicated with a space in the sealed bag, the sealed bag is filled with electrolyte solution and a remnant gas is contained therein; providing a negative pressure on an external surface of the sealed bag to inflate the sealed bag and therefore decompress the sealed bag to vaporize a part of the electrolyte solution, and the remnant gas is separated from the liquid electrolyte solution and mixed with the vaporized electrolyte solution to form a mixed gas; extracting the mixed gas via the degassing tube, therefore the vaporized electrolyte is pressurized to be liquefied in the degassing tube, and the remnant gas is discharged through the degassing tube.

An automatic and passive battery fluid maintenance system maintains the fluid levels in a battery system by replenishing water as the water is lost from the battery. A reservoir is used to contain a volume of fluid and is mounted above the batteries. Fluid from the reservoir flows into a distribution manifold through a flow regulator. From the manifold the fluid is distributed a vent plug at each battery. The vent plugs are configured to control create a backpressure in the fluid line when the battery fluid level is at an optimum level. As a result of the backpressure, fluid does not flow into the battery through the vent plug. When the fluid in the battery drops below the optimum level, the backpressure is reduced, allowing water to flow until the fluid level of the battery again is at the optimum level.

An automatic and passive battery fluid maintenance system maintains the fluid levels in a battery system by replenishing water as the water is lost from the battery. A reservoir is used to contain a volume of fluid and is mounted above the batteries. Fluid from the reservoir flows into a distribution manifold through a flow regulator. From the manifold the fluid is distributed a vent plug at each battery. The vent plugs are configured to control create a backpressure in the fluid line when the battery fluid level is at an optimum level. As a result of the backpressure, fluid does not flow into the battery through the vent plug. When the fluid in the battery drops below the optimum level, the backpressure is reduced, allowing water to flow until the fluid level of the battery again is at the optimum level.

Some embodiments of this application provide an injection nozzle and an injection apparatus containing same. The injection nozzle includes a body, an injection pipe, and a baffle. The body contains a channel arranged along a height direction of the injection nozzle. A first outlet is disposed at a lower part of the channel. The injection pipe is threaded through the channel in a manner of reciprocating movement along the height direction. The baffle is connected to the body and configured to cover the first outlet when a lower end portion of the injection pipe is higher than the first outlet, and be propped open by the injection pipe when the lower end portion of the injection pipe is lower than the first outlet.

A secondary battery includes an electrode assembly, a housing, and a positive electrode terminal and a negative electrode terminal provided to the housing. The housing includes a main body with a first opening and a second opening respectively provided on opposite sides in a long-side direction of the housing, a first sealing body that closes the first opening, and a second sealing body that closes the second opening. The main body includes a pair of long-side surfaces and a pair of short-side surfaces facing each other in a short-side direction of the housing orthogonal to the long-side direction. The electrode assembly includes a negative electrode current collecting portion located on a first end side in the long-side direction, and a positive electrode current collecting portion located on a second end side in the long-side direction. One short-side surface of the pair of short-side surfaces is provided with an injection port.

A secondary battery includes an electrode assembly, a housing, and a positive electrode terminal and a negative electrode terminal provided to the housing. The housing includes a main body with a first opening and a second opening respectively provided on opposite sides in a long-side direction of the housing, a first sealing body that closes the first opening, and a second sealing body that closes the second opening. The main body includes a pair of long-side surfaces and a pair of short-side surfaces facing each other in a short-side direction of the housing orthogonal to the long-side direction. The electrode assembly includes a negative electrode current collecting portion located on a first end side in the long-side direction, and a positive electrode current collecting portion located on a second end side in the long-side direction. One short-side surface of the pair of short-side surfaces is provided with an injection port.