Lithium ion secondary battery, battery pack, and vehicle
A secondary battery and lithium-ion technology, applied in the direction of secondary battery, secondary battery charging/discharging, secondary battery repair/maintenance, etc., can solve the problem of low battery voltage and achieve the effect of excellent life characteristics
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no. 1 Embodiment approach
[0025] According to the first embodiment, a lithium ion secondary battery is provided. This lithium ion secondary battery includes a negative electrode including a layer containing a negative electrode active material, a positive electrode, and an electrolyte containing Li ions and Na ions. The negative electrode active material containing layer contains Na-containing titanium composite oxide. The amount of Na contained in the electrolyte W E (g / g) and the amount of Na contained in the negative electrode active material containing layer W A (g / g) ratio (W E / W A ) satisfy the following formula (1).
[0026] 1×10 -1 ≤W E / W A ≤1×10 5 …(1)
[0027] Among titanium oxides, a Na-containing titanium composite oxide is a composite oxide capable of occluding and releasing lithium at a relatively low potential.
[0028] In Na-containing titanium composite oxides, for example, the general formula Li 2+v Na 2-w M1 x Ti 6-y-z Nb y M2 z o 14+δ The shown orthorhombic Na-con...
no. 2 Embodiment approach
[0200] According to the second embodiment, a battery pack is provided. This battery pack includes the secondary battery of the first embodiment. This battery pack may include one secondary battery according to the first embodiment, or may include a battery module including a plurality of secondary batteries.
[0201] The battery pack of the embodiment may further include a protection circuit. The protection circuit has a function of controlling charge and discharge of the secondary battery. Alternatively, a circuit included in a device using a battery pack as a power source (for example, electronic equipment, a vehicle, etc.) may also be used as a protection circuit for the battery pack.
[0202] In addition, the battery pack according to the embodiment may further include an external terminal for conducting electricity. The external terminals for energization are used to output current from the secondary battery to the outside and / or input current to the secondary battery ...
no. 3 Embodiment approach
[0225] According to a third embodiment, a vehicle is provided. This vehicle is equipped with the battery pack of the second embodiment.
[0226] In the vehicle of the embodiment, the battery pack recovers, for example, regenerative energy of the motive power of the vehicle. A vehicle may include a mechanism for converting kinetic energy of the vehicle into regenerative energy.
[0227] Examples of vehicles include two- to four-wheel hybrid electric vehicles, two- to four-wheel electric vehicles, power-assisted bicycles, and railway vehicles.
[0228] The mounting position of the battery pack in the vehicle is not particularly limited. For example, when the battery pack is mounted on a vehicle, the battery pack may be mounted in an engine room of the vehicle, behind a vehicle body, or under a seat.
[0229] Vehicles can carry multiple battery packs. At this time, the battery packs may be electrically connected in series, may be electrically connected in parallel, or may be ...
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Abstract
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