NingDe Amperex Technology Ltd | Date: 2017-03-29
A device for removing a coating layer of an electrode plate of a lithium-ion battery comprises a conveying system (1) for conveying an electrode plate (6) and a laser system (2), the laser system comprises at least one laser emitting head (21) for emitting a laser beam and projecting the laser beam onto the electrode plate and a beam shaping mechanism (22) for homogenizing energy of the laser beam emitted from the laser emitting head, the laser emitting head and the beam shaping mechanism are electrically connected. In the device for removing the coating layer of the electrode plate of the lithium-ion battery, the beam shaping mechanism is provided, energy of the laser beam can be homogenized, neither damages a foil of the electrode plate so that welding quality of the electrode tab is promoted, nor results in remaining of the coating layer so that the removing quality is promoted, and the energy can be effectively utilized, thereby realizing maximum utilization of the energy of the laser.
NingDe Amperex Technology Ltd and DongGuan Amperex Technology Ltd | Date: 2015-02-12
The present invention belongs to the technical field of lithium-ion secondary batteries and in particularly relates to a lithium-ion secondary battery and the gel electrolyte formula thereof. The gel electrolyte formula comprises 90-99.4% by weight of a liquid electrolyte, 0.5-3% by weight of a monomer, 0.25-0.6% by weight of a cross-linking agent and 0.1-1.5% by weight of an initiator, wherein the monomer is modified polyvinyl alcohol and the derivates thereof, the average molecular weight of which is 510^(4 )to 1510^(4 )g/mol. With respect to the prior art, by using modified polyvinyl alcohol and the derivates thereof having a relatively large average molecular weight as the monomer in a gel electrolyte, the present invention forms a polymer substrate having a relatively high mechanical strength so that a cell containing the gel electrolyte is high in mechanical strength and is therefore less swelled in a cycle process.
Ningde Amperex Technology Ltd and Dongguan Amperex Technology Ltd | Date: 2015-07-27
The present disclosure provides a lithium-ion battery and an electrolyte thereof. The electrolyte of the lithium-ion battery comprises: a non-aqueous organic solvent; a lithium salt discloved in the non-aqueous organic solvent; and an additive dissolved in the non-aqueous organic solvent. The additive comprises 1,3-dioxo-heterocyclic compound with a structural formula I and fluoroethylene carbonate; in the structural formula I, R_(1 )and R_(2 )each independently are H, methyl or ethyl; n is an integer selected from 13; a weight percentage of 1,3-dioxo-heterocyclic compound with the structural formula I in the electrolyte of the lithium-ion battery is 0.05%5%; a weight percentage of fluoroethylene carbonate in the electrolyte of the lithium-ion battery is 1%8%. The lithium-ion battery comprises the aforementioned electrolyte of the lithium-ion battery. The lithium-ion battery of the present disclosure has an excellent high temperature storage performance and an excellent low temperature discharge rate performance.
Dongguan Amperex Technology Ltd and NingDe Amperex Technology Ltd | Date: 2016-05-18
According to one embodiment of the present invention, a lithium ion battery having desirable safety performance is provided. The lithium ion battery includes a battery housing, a battery cover assembled to the battery housing, a pressure relief valve coupled to the battery housing and/or battery cover, and a safety device formed on the housing and/or battey cover and fixed to the pressure relief valve. The safety device includes a shielding plate facing the pressure relief valve, a side wall and an air flow channel structure. The side wall extends from the shielding plate and connects with the battery housing or the battery cover. The air flow channel structure is defined in the side wall.
Dongguan Amperex Technology Ltd and Ningde Amperex Technology Ltd | Date: 2015-08-12
An electrolyte solution for a lithium-ion battery and a lithium-ion battery using the electrolyte solution are provided. The electrolyte solution includes organic solvents, an electrolyte lithium salt, and additives. The additives include succinonitrile, fluorobenzene, and lithium tetrafluoroborate. The percentage by mass of the fluorobenzene in the electrolyte solution is 0.1%-15%. The percentage by mass of the succinonitrile in the electrolyte solution is 0.1%-10%. The percentage by mass of the lithium tetrafluoroborate in the electrolyte solution is 0.01%-1%. The electrolyte solution may increase the charging voltage upper limit and improve the high-temperature intermittent cyclability of the lithium-ion battery. At the same time, the electrolyte may lower the battery swelling rate, reduce the internal resistance, and improve the stability and safety of the lithium-ion battery.
Dongguan Amperex Technology Ltd and NingDe Amperex Technology Ltd | Date: 2016-02-10
An electrochemical energy storage device comprises a cell (1), an electrolyte and a package (2). The electrochemical energy storage device further comprises a binding material (3) positioned between the cell (1) and the package (2). The binding material (3) comprises a first adhesive layer (31) and a second functional layer (32). The first adhesive layer (31) is directly or indirectly adhered and positioned on an outer surface of the cell (1); the second functional layer (32) is positioned on a side of the first adhesive layer (31) opposite to a surface of the first adhesive layer (31) directly or indirectly adhered on the cell (1), the second functional layer (32) is not adhered to the package (2) before a pressure is applied, and the second functional layer (32) is adhered to the package (2) after the pressure is applied.
Ningde Amperex Technology Ltd and Dongguan Amperex Technology Ltd | Date: 2016-04-06
The present application discloses a binder for a lithium ion battery, which comprises a polymer obtained through emulsion polymerization of a monomer in the presence of a reactive emulsifying agent. The binder is used in fabrication of a lithium ion electrode plate, whereby a thin film formed on the surface of an electrode membrane and fine channels formed in the electrode membrane with the use of a conventional emulsifying agent during the electrode membrane-forming process are eliminated, and the lithium ion conductivity of the electrode membrane is improved. Meanwhile, with the use of the reactive emulsifying agent, the bonding effect of the binder and the stability of the electrode membrane are improved, thereby greatly improving the charging rate and cycle life of the lithium ion battery.
Ningde Amperex Technology Ltd | Date: 2016-01-08
Disclosed in this application is an electrolyte solution, comprising a non-aqueous organic solvent, a lithium salt, and additives, characterized in that the additives comprise a cyclic sulfate ester compound and a naphthalene compound with amino group. When the electrolyte solution is used in lithium ion secondary batteries, the batteries are ensured to have good cycling and storage performances at high temperature, and have the advantages of low swelling during use at high temperature, low internal resistance and good charge and discharge performances at low temperature.
Ningde Amperex Technology Ltd | Date: 2015-11-09
The present invention provides a method for preparing a positive active material for a secondary lithium battery. The method includes the steps of: synthesizing an intermediate product of a core represented by formula Li_(x)M_(y)N_(1-y)O_(2-)A_(); adding P source into the intermediate product to obtain a phosphate which does not contain lithium; and adding lithium source into the mixture of the phosphate and Li_(x)M_(y)N_(1-y)O_(2-)A_() and sintering to obtain the positive active material for secondary lithium battery. The method for preparing a positive active material for a secondary lithium battery of the present invention has the following advantages: 1) the P source can be dispersed on the surface of the core more uniformly; 2) the coating layer can be bonded to the core more tightly; and 3) the positive active material has higher rate discharge performance.
Ningde Amperex Technology Ltd | Date: 2016-01-06
A cap assembly of a power battery comprises: a cap plate, a first electrode terminal provided to the cap plate, a second electrode terminal provided to the cap plate and electrically insulated from the cap plate, and a resistance member electrically connected to the cap plate and the first electrode terminal. The resistance member comprises: a heat-resistant insulating base body positioned between the cap plate and the first electrode terminal; and a heat-resistant metal layer provided to the heat-resistant insulating base body. The heat-resistant metal layer and the cap plate and the first electrode terminal are electrically connected to form a conductive path, the conductive path passes along the heat-resistant insulating base body positioned between the cap plate and the first electrode terminal. The formed conductive path is a curved path, therefore the resistance value of the resistance member can be controlled by controlling the conductive path.