Battery module capable of automatically balancing voltage

Abstract

The utility model relates to a battery module capable of automatically balancing voltage, which structurally comprises a battery module, spring probes and an automatic balancing machine, a plurality of battery core pole pieces are arranged on the battery module, the spring probes corresponding to the battery core pole pieces in number and position are crimped on the battery core pole pieces, and the automatic balancing machine is arranged on the battery module. Each spring probe is in signal connection with an automatic balancing machine through a wire, all the wires form a wire harness, and the automatic balancing machine is connected with an external power supply. The utility model has the advantages that: 1) the battery cell voltage in the battery module can be automatically balanced, and compared with passive balance or active balance of a common BMS, the balance current is larger and is allowed to be not less than 200A, so that the balance efficiency can be greatly improved; the device is simple in structure, convenient to install, capable of using multiple sets of appliances to process multiple sets of batteries at the same time, capable of accurately controlling PID balance and guaranteeing balance accuracy, capable of achieving battery core balance in a module and module balance in a cluster and good in balance effect due to the fact that the device is provided with the two-way DC / DC circuit and the two-way AC / DC circuit.

Description

Technical Field

[0001] The utility model relates to a battery module, in particular to a battery module with automatic voltage balancing, and belongs to the technical field of clean energy power generation. Background Art

[0002] After the lithium battery module has been used for energy storage for a period of time, as the temperature, voltage, internal resistance, external resistance and other technical indicators change, the voltage difference between the cells of the lithium battery module will continue to increase. When it increases to a certain extent, it will affect the operation of the entire power station.

[0003] In existing designs, passive balancing or active balancing of BMS is generally used to balance the voltage difference between cells. There are problems such as small balancing current, low balancing efficiency, and poor balancing accuracy, which cannot effectively meet the needs of use. Utility Model Content

[0004] The utility model provides a battery module with automatic voltage balancing, which aims to overcome the above-mentioned deficiencies in the prior art, improve battery balancing efficiency, and improve balancing effect.

[0005] The technical solution of the utility model is: a battery module with automatic voltage equalization, which includes a battery module, a spring probe and an automatic equalizer, wherein the battery module is provided with a plurality of battery cell pole pieces, and the spring probes corresponding to the number and position of the battery cell pole pieces are crimped on the battery cell pole pieces, and each spring probe is connected to the automatic equalizer through a wire signal, and all wires form a wiring harness, and the automatic equalizer is connected to an external power supply. The spring probe is crimped on the battery cell pole piece, and the automatic equalizer has a built-in multi-channel bidirectional DC / DC circuit to charge the high-voltage battery cell to the low-voltage battery cell, realizing PID precise control until the voltage of all batteries is consistent.

[0006] Preferably, the spring probe is arranged on a probe holder, and fixing claws are arranged on both sides of the probe holder, and the probe holder is clamped on the battery module through the fixing claws. The spring probe can be effectively crimped on the battery cell pole piece, and the structural design of the spring probe, the probe holder and the fixing claw can be directly clamped on the battery module, and is compatible with battery modules with less than 26 strings.

[0007] Preferably, a guide rail is provided on the probe rack, and the spring probe is slidably connected to the guide rail.

[0008] Preferably, the automatic balancing machine is a 12kW DC / DC isolated bidirectional power supply. The automatic balancing machine supports voltage balancing of modules within the cluster, achieves consistent voltage of modules within the cluster, charges or discharges the corresponding modules through an external power supply, and achieves the purpose of consistent voltage of battery modules within the cluster.

[0009] The advantages of the utility model are: 1) It can automatically balance the cell voltage in the battery module. Compared with the passive balancing or active balancing of ordinary BMS, the balancing current is larger, allowing no less than 200A, which can greatly improve the balancing efficiency;

[0010] 2) Easy to install, multiple sets of equipment can be used to process multiple sets of batteries at the same time;

[0011] 3) It has PID balance precise control function to ensure balance accuracy;

[0012] 4) It has bidirectional DC / DC circuit and bidirectional AC / DC circuit, which can achieve cell balance within the module and module balance within the cluster, with good balancing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The utility model is a structural schematic diagram of a battery module with automatic voltage equalization.

[0014] Figure 2 The utility model is a system principle diagram of a battery module with automatic voltage equalization.

[0015] In the figure, 1 is the battery module, 2 is the battery cell electrode, 3 is the spring probe, 4 is the probe holder, 5 is the fixing claw, 6 is the wiring harness, 7 is the automatic balancing machine, and 8 is the external power supply. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below in conjunction with embodiments and specific implementation methods.

[0017] like Figure 1 , 2 As shown, a battery module with automatic voltage equalization has a structure including a battery module 1, a spring probe 3 and an automatic equalizer 7, wherein a plurality of battery cell pole pieces 2 are provided on the battery module 1, and spring probes 3 corresponding to the number and position of the battery cell pole pieces 2 are arranged on a probe rack 4, and fixing claws 5 are arranged on both sides of the probe rack 4, the probe rack 4 is clamped on the battery module 1 by the fixing claws 5, and the spring probes 3 are crimped on the battery cell pole pieces 2, each spring probe 3 is connected to the automatic equalizer 7 through a wire signal, all the wires form a wiring harness 6, and the automatic equalizer 7 is connected to an external power supply 8.

[0018] According to the above structure, the spring probe 3 can be effectively crimped onto the battery cell electrode 2, and the high-voltage battery cell can be charged to the low-voltage battery cell through the built-in multi-channel bidirectional DC / DC circuit of the automatic balancing machine 7, realizing PID precise control until the voltages of all battery cells are consistent.

[0019] The battery module 1 is generally a 280AH lithium iron phosphate battery cell, which can be upgraded to a 314-320AH battery cell in the future, but the existing appearance and size remain unchanged. The battery module 1 made of this battery cell is the basic structure of the energy storage project, and several battery modules 1 form a battery PACK or directly form a battery cluster.

[0020] The structural design of the spring probe 3, the probe holder 4 and the fixing claw 5 can be directly clamped on the battery module 1, and is compatible with battery modules 1 with less than 26 strings.

[0021] The probe rack 4 is preferably provided with guide rails (preferably 2 rails), and the spring probe 3 is slidably connected to the guide rails. The spring probe 3 can allow a large current (not less than 200A) to pass through. The spring probe 3 can be conveniently crimped onto the cell pole piece 2 of the battery module 1 to ensure that the pole piece of each cell is connected with a probe.

[0022] The automatic equalizer 7 supports voltage balancing of modules within the cluster, achieving consistent voltage of modules within the cluster. Through an external power supply and a built-in bidirectional AC / DC circuit, the corresponding module is charged or discharged, achieving consistent voltage of battery modules within the cluster.

[0023] The automatic balancing machine 7 preferably uses a 12kW DC / DC isolated bidirectional power supply, such as BTLA-MTS012-200L-01 from Xi'an Bentelio Technology.

[0024] All the components mentioned above are prior art, and those skilled in the art can use any model and existing design that can achieve their corresponding functions.

[0025] The above is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the present invention, and these modifications and improvements all fall within the protection scope of the present invention.

Claims

1. A battery module with automatic voltage equalization, characterized in that: The invention comprises a battery module (1), a spring probe (3) and an automatic balancing machine (7), wherein a plurality of battery cell pole pieces (2) are provided on the battery module (1), spring probes (3) corresponding in number and position to the battery cell pole pieces (2) are crimped onto the battery cell pole pieces (2), each spring probe (3) is connected to the automatic balancing machine (7) via a wire signal, all wires form a wiring harness (6), and the automatic balancing machine (7) is connected to an external power supply (8).

2. A battery module with automatic voltage equalization as claimed in claim 1, characterized in that: The spring probe (3) is arranged on a probe frame (4), fixing claws (5) are arranged on both sides of the probe frame (4), and the probe frame (4) is clamped on the battery module (1) by the fixing claws (5).

3. A battery module with automatic voltage equalization as claimed in claim 2, characterized in that: The probe frame (4) is provided with a guide rail, and the spring probe (3) is slidably connected to the guide rail.

4. A battery module with automatic voltage equalization as claimed in claim 1, characterized in that: The automatic balancing machine (7) is a 12kW DC / DC isolated bidirectional power supply.

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