Dual-Motor Neutral-Point Battery Heating With Series Windings
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Solution Overview
Problem
In low-temperature environments, the discharge capacity of power batteries deteriorates, and existing methods for battery heating in dual-motor drive systems suffer from low temperature rise efficiency due to limited participation of windings in the charging and discharging process, leading to inefficient heating and potential overcurrent damage to components.
Innovation Solution
A method and apparatus that connects the first and second motors in series, forming alternately switched charging and discharging loops between their neutral points, incorporating more windings into the loops to increase inductance and electrical energy storage, thereby enhancing battery heating efficiency while reducing the risk of overcurrent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one motor is used for battery heating in dual-motor drive systems, then the circuit structure is simple, but the temperature rise efficiency is low due to limited winding participation
Solution Approach 1:
The patent merges both motors into the battery heating circuit by connecting their windings in series through a neutral point connection. This allows all windings from both motors to participate in the heating process, significantly increasing the total inductance and electrical energy storage capacity, thereby improving temperature rise efficiency while maintaining circuit simplicity
2Use of energy by moving object
If more windings are incorporated into the charging and discharging loops, then the electrical energy storage capacity increases, but the risk of overcurrent damage to components increases
Solution Approach 1:
The patent employs periodic alternating charging and discharging cycles through controlled bridge arm switching. This periodic action distributes the current stress over time, prevents sustained overcurrent conditions, and allows thermal management while accumulating sufficient electrical energy in the windings for effective heating
3Productivity
If the bridge arms are switched frequently to form alternately switched loops, then the battery heating efficiency improves, but the switching loss and component stress increase
Solution Approach 1:
The patent optimizes switching parameters including frequency, duty cycle, and timing sequences of the bridge arms. By carefully controlling these parameters, the system achieves effective battery heating through alternating loops while minimizing switching losses and reducing stress on switching components
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method improves battery heating efficiency by increasing the temperature rise rate and reduces the risk of overcurrent damage to components, maintaining a stable rotor and minimizing eddy current losses, thus optimizing battery performance in low-temperature conditions.
Implementation Method 1
the internal resistance of the battery generates heat, thereby achieving the effect of battery heating
Data Source
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AI summary
Disclosed in the present application are a charge and discharge control method and apparatus, and a device, a storage medium and a program product. The method comprises: when a battery heating condition is satisfied, turning on a connecting circuit between a neutral point of a first electric motor and a neutral point of a second electric motor, wherein a first electric motor controller connected to the first electric motor and a second electric motor controller connected to the second electric motor are both connected between a positive electrode and a negative electrode of a battery; and controlling the turning-on/turning-off of bridge arms in the first electric motor controller and the second electric motor controller, and forming, in a circuit in which the battery is located, a charging loop and a discharging loop which are alternately switched. In the present application, the total inductance of windings in an access loop can increase, such that the electric quantity storage capability is improved, which is conducive to the improvement of the battery heating efficiency. A freewheel loop is added following a discharge loop, such that the peak current is reduced, the electric motor noise is reduced, and the overcurrent damage of a device is reduced. In a solution where all windings of the same electric motor have the same current direction, rotor heating situations can be reduced.