Method for heating energy storage cells of an energy storage system, and heatable energy storage system
A technology of energy storage device and energy storage unit, which is applied in the direction of power consumption device, control device, battery/fuel cell control device, etc., and can solve the problem that the battery unit cannot provide full power, etc.
Active Publication Date: 2014-12-10
ROBERT BOSCH GMBH +1
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Problems solved by technology
Since battery cells generally have a temperature-dependent internal resistance, which increases as the temperature drops, it can happen that the battery cells are not able to provide full power at low temperatures
Method used
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[0032] figure 1 A system 100 is shown for voltage conversion from a DC voltage supplied via an energy storage module 3 into an n-phase AC voltage. The system 100 comprises an energy storage device 1 with energy storage modules 3 which are connected in series in an energy supply branch. For example in figure 1 shows three energy supply branches Z1 , Z2 and Z3 , which are suitable for generating a three-phase AC voltage, for example for an AC motor. However, it is clear that any other number of supply branches can also be possible. The energy storage device 1 has an output connection 1 a , 1 b , 1 c on each energy supply branch, which are respectively connected to phase conductors 2 a , 2 b or 2 c which couple the energy storage device 1 to the electric machine 2 . For example system 100 in figure 1 Used for the power supply of motor 2. However, it can also be provided that the energy storage device 1 is used to generate current for the energy supply network 2 .
[0033] T...
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The invention relates to a method for heating energy storage cells of an energy storage system, which is configured for generating an n-phase supply voltage, wherein n > 1, and which comprises n energy supply branches connected in parallel, each being coupled between an output connection and an equipotential frame. According to the invention, each of the energy supply branches is provided with a plurality of series-connected energy storage modules, each comprising an energy storage cell module having at least one energy storage cell, and a coupling device having coupling elements configured to selectively connect or bridge the energy storage cell module in the respective energy supply branch. The method comprises the steps of connecting the output connections of the energy storage system to input connections of an n-phase electrical machine, and coupling the output connections via the neutral point of the electrical machine, actuating the coupling devices of at least one energy storage module of a first energy supply branch for switching the respective energy storage cell modules into the first energy supply branch while simultaneously actuating the coupling devices of at least one energy storage module of a second energy supply branch for switching the respective energy storage cell modules into the second energy supply branch for a first predetermined time span.
Description
technical field [0001] The invention relates to a method for heating an energy storage unit of an energy storage device and a heatable energy storage device, in particular an energy storage device for a modular battery system of an electric vehicle. Background technique [0002] There are indications that in the future not only in stationary applications such as wind or solar power systems but also in vehicles such as hybrid or electric vehicles more and more electronic systems will be used which combine energy storage technology with electric drive technology mix. [0003] The multiphase current supply to the electric machine is usually achieved by means of a converter in the form of a pulse inverter. For this purpose, the DC voltage provided by the DC voltage intermediate circuit can be converted into a multiphase AC voltage, for example a three-phase AC voltage. The direct voltage intermediate circuit is supplied here by the string of battery modules connected in series...
Claims
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IPC IPC(8): H01M10/42B60L11/18H01M10/615H01M10/625H01M10/637
CPCH01M10/5016H01M10/5026Y02T10/7011Y02T10/7241B60L2220/12H01M2220/20Y02T10/641H01M10/0525Y02T10/7005B60L2240/80B60L2240/545H01M10/425B60L11/1864H01M10/5006B60L11/1853B60L11/1875Y02T10/705B60L2210/30B60L2220/54B60L58/18B60L58/21B60L58/27H01M10/615H01M10/625H01M10/637H01M10/65Y02E60/10Y02T10/64Y02T10/70Y02T10/72
Inventor P·福伊尔施塔克H·帕尔特斯
Owner ROBERT BOSCH GMBH