Virtual internal resistance adjusting device for equalization between battery clusters

A technology for regulating devices and battery clusters, which is applied in the field of electric power and can solve problems such as increased differences, weakened direct parallel connection capabilities of battery clusters, and battery clusters that cannot be fully charged.

Pending Publication Date: 2021-12-10
四川科陆新能电气有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This change will weaken the direct parallel connection capability of battery clusters, resulting in circulating current during zero-power operation, battery clusters with large internal resistance cannot be fully charged during charging, and battery clusters with large internal resistance cannot provide sufficient power during discharge.
If things go on like this, there will be situations where the entire system cannot continue to operate due to the short board effect that occurs after a pack of batteries is abnormal
After the maintenance of a single pack of batteries, a new battery pack is used for replacement, and there are cases where old and new batteries are mixed, which further increases the difference

Method used

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  • Virtual internal resistance adjusting device for equalization between battery clusters
  • Virtual internal resistance adjusting device for equalization between battery clusters
  • Virtual internal resistance adjusting device for equalization between battery clusters

Examples

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Embodiment 1

[0030] refer to Figure 1-9 , a virtual internal resistance adjustment device for balancing between battery clusters, including a plurality of battery clusters 2, the battery clusters 2 are connected to the DC bus 1 through an adjustment device 5, and the adjustment device 5 includes a bypass switch 6 and the voltage regulating DC converter 7, the bypass switch 6 and the voltage regulating DC converter 7 are connected in parallel; the DC bus 1 is connected to the energy storage converter 3, and the energy storage converter 3 is connected to the grid 4 The DC power is converted into AC power through the energy storage converter 3 and connected to the grid 4 to realize the energy exchange between the battery cluster 2 and the grid 4 . When the voltage-regulating DC converter 7 is not required to work or the voltage-regulating DC converter 7 is abnormal, the bypass switch 6 is turned on to directly connect the battery cluster 2 to the DC bus 1. At this time, the virtual internal ...

Embodiment 2

[0061] In this embodiment, an IGBT switch tube (not marked in the drawings) is connected in series with the voltage regulating DC converter 7, which is used for the us-level protection of the short circuit of the DC bus 1, and can also be used for the instantaneous overshoot of the DC bus 1 pressure protection. The IGBT switch tube remains on during operation. Although there is only a turn-on loss, the fixed loss is also large under high-power conditions, which has certain requirements for overall heat dissipation. In addition, the IGBT switch tube is connected in series in the main circuit without a buffer link, and the impact resistance is poor. Then, when a capacitive load is put on the DC bus 1, there is a protection shutdown, or the shutdown is not timely and the device is damaged.

[0062] IGBT (Insulated Gate Bipolar Transistor), Insulated Gate Bipolar Transistor, is a composite fully-controlled voltage-driven power semiconductor device composed of BJT (Bipolar Transist...

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Abstract

The invention discloses a virtual internal resistance adjusting device for equalization between battery clusters, which comprises a plurality of battery clusters (2), wherein the battery clusters (2) are connected with a direct current bus (1) through an adjusting device (5), and the adjusting device (5) comprises a bypass switch (6) and a voltage adjusting direct current converter (7); and the direct current bus (1) is connected with an energy storage converter (3), the energy storage converter (3) is connected with a power grid (4), direct current is converted into alternating current through the energy storage converter (3), the alternating current is connected into the power grid (4), and energy exchange between the battery cluster (2) and the power grid (4) is achieved. The purpose of equalizing the SOC between the battery clusters (2) can be achieved by adjusting the output voltage of the adjusting device (5), independent management of each battery cluster (2) can be achieved, and the situation that due to long-term operation, the internal resistance and voltage of the batteries are inconsistent, and consequently the overall operation effect and the cycle life are affected is avoided.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a virtual internal resistance adjusting device for balancing between battery clusters. Background technique [0002] Energy storage technology mainly refers to the storage of electrical energy. The stored energy can be used as emergency energy, and can also be used for energy storage when the grid load is low, and output energy when the grid load is high, for peak shaving and valley filling, and to reduce grid fluctuations. Energy comes in many forms, including radiation, chemical, gravitational potential energy, electrical potential energy, electricity, high temperature, latent heat, and kinetic energy. Energy storage involves converting energy from a form that is difficult to store into a more convenient or economically storable form. [0003] Among them, electrochemical energy storage has been widely used in various occasions such as power generation side, grid side ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H02J7/02H02J3/32H01M10/42
CPCH02J7/0019H02J7/02H02J3/32H01M10/4207H01M2010/4271H02J2207/20Y02E60/10
Inventor 谢茂军冯朝金王欢
Owner 四川科陆新能电气有限公司
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