Battery cell balancing device of power battery

Abstract

The utility model belongs to the technical field of cell balancing, and particularly relates to a cell balancing device of a power battery, which comprises a controller, a transformer, a channel selector and a transformer switch group, and the controller is connected with the transformer switch group to control the transformer and is connected with two ends of a battery pack after being connected with the transformer in series. The battery comprises a plurality of battery modules, the controller controls the channel selector to be used for selecting different battery modules in a balanced mode, the power battery cell balancing device provided by the utility model adopts the winding transformer to realize balanced charging, and is simple in composition structure, simple in circuit composition connection and lower in cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery cell balancing, and particularly relates to a power battery cell balancing device. Background Art

[0002] At present, the power battery cell balancing devices are generally inductive or capacitive. The above forms often have a relatively complex structure and a relatively complex circuit composition, resulting in a relatively high cost.

[0003] For example, in the patent CN104009508A, a battery charging management balancer includes an input circuit, a battery voltage detection circuit, a capacitive flywheel balancing circuit, a pulse generation circuit, and a charge and discharge start circuit. The power supply voltage is connected to the current input end of the input circuit, the current output end of the input circuit is respectively connected to the input ends of a plurality of the battery voltage detection circuits, the output ends of the battery voltage detection circuits are correspondingly connected to the input ends of a plurality of the capacitive flywheel balancing circuits, the output ends of a plurality of the capacitive flywheel balancing circuits are respectively connected to the input end of the pulse generation circuit, and the current output end of the pulse generation circuit is connected to the input end of the charge and discharge start circuit. The invention can reduce the impact of the charging current on the battery, and by continuously adjusting the frequencies of different pulse currents in the same group of batteries during the charging process, the battery is always in a fully charged state, thereby prolonging the service life of the battery.

[0004] It is a capacitive balancer and has the above technical problems. Summary of the Utility Model

[0005] The utility model provides a power battery cell balancing device, which can solve the problems pointed out in the background art.

[0006] A power battery cell balancing device includes a controller, a transformer, a channel selector, and a transformer switch group. The controller is connected to the transformer switch group to control the transformer and is connected in series with the transformer and then connected to both ends of the battery pack. The battery includes a plurality of battery modules, and the controller controls the channel selector to evenly select different battery modules.

[0007] Preferably, the channel selector includes a plurality of battery module switches, which are arranged in one-to-one correspondence with the battery modules.

[0008] Preferably, the transformer switch group includes a PWM and a switching tube.

[0009] Preferably, the controller is based on the BMS system.

[0010] Advantageous Effects: The utility model provides a power battery cell balancing device, which realizes balanced charging by using a winding transformer. Its composition structure is simple, the circuit composition connection is simple, and the cost is relatively low. Description of the Drawings

[0011] Figure 1 This is a schematic diagram of the logic control of the present utility model,

[0012] Figure 2 and this is a schematic diagram of the circuit of the present utility model,

[0013] Description of the Reference Numerals in the Drawings:

[0014] Reference Numerals in the Figures: Controller 1; Transformer 2; Channel Selector 3; Battery Module Switch 31; Battery Module 4; Transformer Switch Group 5; PWM 51; Switching Tube 52. Detailed Embodiment

[0015] Next, with reference to the drawings, a detailed description of a specific embodiment of the present utility model will be given. It should be understood that the protection scope of the present utility model is not limited by the specific embodiment.

[0016] Embodiment 1:

[0017] As Figure 1-2 shown, a power battery cell equalization device includes a controller 1, a transformer 2, a channel selector 3, and a transformer switch group 5. The controller 1 is connected to the transformer switch group 5 to control the transformer 2 and is connected in series with the transformer 2 and then connected to both ends of the battery pack. The battery includes a plurality of battery modules 4, and the controller 1 controls the channel selector 3 to evenly select different battery modules 4.

[0018] Preferably, the channel selector 3 includes a plurality of battery module switches 31, which are arranged in one-to-one correspondence with the battery modules 4.

[0019] Preferably, the transformer switch group 5 includes a PWM 51 and a switching tube 52.

[0020] Preferably, the controller 1 is based on the BMS system.

[0021] Working Principle of the Present Utility Model: The controller 1 reads information such as the voltage values of each battery module 4 through the BMS system and displays them. If the difference between the highest voltage value and the lowest voltage value of the battery modules 4 exceeds the set threshold voltage, the controller 1 will switch the corresponding battery module switch 31 to the module with the lowest voltage and control the PWM 51 to make the switching tube 52 work, so that the transformer 2 works to charge the module with the lowest voltage in the entire battery pack. When the voltage is charged within the threshold range, the work stops, so as to keep the voltages of the modules in the entire battery pack tending to be consistent.

[0022] The above are only several specific embodiments of the present utility model disclosed. However, the embodiments of the present utility model are not limited thereto, and any changes that can be conceived by those skilled in the art shall fall within the protection scope of the present utility model.

Claims

1. A power battery cell balancing device, characterized in that: It includes a controller (1), a transformer (2), a channel selector (3) and a transformer switch group (5). The controller (1) is connected to the transformer switch group (5) to control the transformer (2), and is connected in series with the transformer (2) and then connected to both ends of the battery pack. The battery includes a plurality of battery modules (4), and the controller (1) controls the channel selector (3) to evenly select different battery modules (4).

2. The battery cell equalization device according to claim 1, characterized in that: The channel selector (3) includes a plurality of battery module switches (31), which are arranged in one-to-one correspondence with the battery modules (4).

3. The equalization device for a power battery cell according to claim 1, characterized in that: The transformer switch group (5) includes a PWM (51) and a switching tube (52).

4. A power battery cell balancing device according to any one of claims 1-3, characterized in that: The controller (1) is based on the BMS system.

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