Active balancing board battery pack

Abstract

The application discloses an active equalization plate battery pack, which comprises a battery shell and a plurality of battery monomers arranged in the battery shell, and further comprises an active equalization plate arranged in the battery shell; the plurality of battery monomers are electrically connected through monomer battery connecting columns and monomer connecting lines to form a battery pack body in series or parallel connection; and a shell connecting column is arranged on the battery shell, and the battery pack body is electrically connected with the shell connecting column through a battery and shell connecting column connecting line. The active equalization plate of the active equalization plate battery pack is independent of a charging and discharging circuit, full-state real-time equalization is realized, capacity utilization is improved, lithium iron phosphate battery cells and flame-retardant isolation cotton are adopted, shock buffering and anti-shock and thermal runaway blocking are realized, safety is high, the shell connecting column supports series and parallel connection expansion, modular design facilitates installation and maintenance, internal integration is high, layout is clear and easy to overhaul, the shell is provided with polarity marks, reverse connection and short circuit are prevented, and operation is convenient and safe.

Description

Technical Field

[0001] This invention relates to the field of battery technology, specifically to an active balancing plate battery pack. Background Technology

[0002] Lithium-ion batteries are widely used in energy storage systems, electric vehicles, and UPS power supplies. Among them, lithium iron phosphate batteries are favored due to their high safety, long cycle life, and environmental friendliness. However, in practical applications, differences in manufacturing processes, usage environments, and aging levels among individual battery cells can lead to voltage inconsistencies during charging and discharging. This inconsistency can result in reduced capacity utilization, increased safety hazards, and shortened battery life.

[0003] Existing battery balancing technologies are mainly divided into passive balancing and active balancing. Passive balancing circuits are simple and low-cost, but they waste a lot of energy and can only operate under low current, resulting in low balancing efficiency. Active balancing, while more efficient, is mostly integrated into the battery management system and coupled to the main charging and discharging circuit, increasing system complexity and failure risk. A failure in the balancing circuit can affect the normal output of the entire battery pack. Furthermore, existing battery packs also lack scalability and safety, making it difficult to meet user needs. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide an active equalization plate battery pack with reasonable structure, high safety, excellent equalization efficiency and good scalability, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An active balancing battery pack includes a battery casing and a plurality of battery cells disposed within the battery casing, and further includes:

[0007] An active equalization plate is disposed inside the battery casing;

[0008] The multiple battery cells are electrically connected to each other through battery cell connecting posts and battery cell connecting lines to form a battery pack body connected in series or in parallel.

[0009] The outer casing terminal is disposed on the battery casing, and the battery pack body is electrically connected to the outer casing terminal through the battery-outer casing terminal connection line to perform charging and discharging output to the outside;

[0010] The active balancing plate is electrically connected to each of the battery cells.

[0011] The active balancing plate is independent of the charging and discharging circuit of the battery pack body and is configured to perform balancing adjustment only on each of the battery cells.

[0012] The active balancing board establishes an electrical connection with each individual battery cell; the active balancing board is not connected to the main charging and discharging circuit of the battery pack body, and operates independently of the main charging and discharging circuit, and is used to balance and adjust each individual battery cell to reduce the voltage difference between each individual battery cell; the active balancing board can perform balancing operations on the individual battery cells in the charging state, discharging state and resting state of the battery pack body.

[0013] Preferably, the battery cell is either a lithium iron phosphate battery cell or a lithium iron manganese battery cell.

[0014] Preferably, the active balancing board is electrically connected to each of the individual battery cells via an active balancing board connector and a balancing board connecting wire.

[0015] Preferably, the active balancing board is configured to reduce the voltage difference between each of the battery cells; and the active balancing board provides equalization protection for each of the battery cells in the charging state, discharging state and static state of the battery pack.

[0016] Preferably, the battery cell is configured to be connected in series or in parallel with other battery cells of the same specification via the housing terminals to assemble a battery pack body with high voltage or large capacity.

[0017] Preferably, the outer surface of the battery casing is provided with polarity markings corresponding to the positive and negative terminals of the battery cells.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. Independent and efficient active balancing: This application separates the active balancing board from the battery's charging and discharging circuit, and only performs balancing adjustment on each individual battery cell. This avoids mutual interference between the balancing circuit and the main circuit, ensuring the stability of the battery pack under high current charging and discharging, and enabling real-time balancing protection for each cell in all states of charging, discharging and rest. This effectively reduces the voltage difference between individual cells and improves the overall capacity utilization of the battery pack.

[0020] 2. Significantly improves safety. The battery pack uses lithium iron phosphate safety cells and has protective flame-retardant insulation cotton between the battery cells and the inner wall of the casing. This not only serves as a buffer and shock absorber, but also provides flame-retardant isolation protection in extreme cases, greatly reducing the risk of thermal runaway and ensuring the personal and property safety of users.

[0021] 3. Excellent scalability and flexibility: The battery pack allows users to easily connect multiple batteries of the same specification in series or parallel through the casing terminals to build energy storage systems with higher voltage or larger capacity. The modular design reduces the installation difficulty and maintenance cost of large-scale energy storage systems.

[0022] 4. The structure is compact and easy to maintain. The active balancing plate, connecting components and protective materials are all integrated inside the battery casing, forming a highly integrated structure with a clear internal layout, which facilitates later inspection and maintenance.

[0023] 5. Intuitive polarity markings: The outer casing has clear polarity markings to prevent short circuits or equipment damage caused by reverse polarity when connecting in series or parallel, thus improving the convenience and safety of operation. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention.

[0025] Figure 2 This is a schematic diagram showing the external connection of multiple battery pack bodies according to the present invention.

[0026] Figure 3 This is a schematic diagram of multiple battery pack bodies connected in parallel externally according to the present invention.

[0027] In the diagram: 1. Battery cell; 2. Battery cell connection post; 3. Battery cell connection wire; 4. Battery casing; 5. Casing terminal; 6. Active balancing board; 7. Active balancing board wiring connector; 8. Battery and casing terminal connection wire; 9. Balance board connection wire; 11. Battery pack connection post; 12. Battery pack body; 13. Battery pack connection wire; 14. Positive output wire; 15. Negative output wire. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Example 1

[0030] Please see Figure 1 The present invention provides a technical solution:

[0031] An active balancing battery pack includes a battery casing 4 and a plurality of battery cells 1 disposed within the battery casing 4, and further includes:

[0032] Active equalization plate 6 is installed inside the battery casing 4;

[0033] Multiple battery cells 1 are electrically connected to each other through battery cell connecting posts 2 and battery cell connecting lines 3 to form a battery pack body 12 connected in series or in parallel.

[0034] The outer casing terminal 5 is located on the battery casing 4. The battery pack body 12 is electrically connected to the outer casing terminal 5 through the battery-outer casing terminal connection line 8 to enable external charging and discharging output.

[0035] The active balancing plate 6 is electrically connected to each individual battery cell 1.

[0036] The active balancing plate 6 is independent of the charging and discharging circuit of the battery pack body 12 and is configured to balance and adjust only each individual battery cell 1.

[0037] Battery cell 1 is either a lithium iron phosphate battery cell or a lithium iron manganese battery cell.

[0038] The active equalization board 6 is electrically connected to each battery cell 1 via the active equalization board connector 7 and the equalization board connecting wire 9.

[0039] The active balancing board 6 is configured to reduce the voltage difference between each battery cell 1; and the active balancing board 6 provides equalization protection for each battery cell 1 in the charging state, discharging state and static state of the battery pack body 12.

[0040] The battery cell 1 is configured to be connected in series or in parallel with other battery cells 1 of the same specification via the housing terminal 5 to assemble a battery pack body 12 with high voltage or large capacity.

[0041] The outer surface of the battery casing 4 is provided with polarity markings corresponding to the positive and negative terminals of the battery cell 1.

[0042] like Figure 1 As shown, an active balancing plate battery pack of the present invention includes a battery casing 4 and a plurality of battery cells 1 disposed within the battery casing 4. In this embodiment, the battery cells 1 are lithium iron phosphate battery cells, and there are 4 of them, which are connected in series to form a battery pack body 12 with an output voltage of 12.8V.

[0043] Similarly, users can add lithium iron phosphate cells in series or parallel as needed to output different voltages.

[0044] Multiple battery cells 1 are electrically connected through battery cell connecting posts 2 and battery cell connecting wires 3. Specifically, the battery cell connecting posts 2 are fixed to the positive and negative terminals of the battery cell, and the battery cell connecting wires 3 are usually copper busbars or nickel sheets that connect the positive and negative terminals of adjacent cells in sequence to form a series circuit.

[0045] An active balancing board 6 is also installed inside the battery casing 4. The active balancing board 6 is electrically connected to the positive and negative terminals of each battery cell 1 through the active balancing board connector 7 and the balancing board connecting wire 9. The balancing board connecting wire 9 is used to collect the voltage signal of each cell and perform the transfer of balancing energy.

[0046] Operating Logic: The active balancing board 6 operates independently of the main charging and discharging circuit of the battery pack body 12. It does not participate in the external charging and discharging process of the battery pack, but is only responsible for monitoring the voltage of each individual cell. When a cell voltage is detected to be too high or too low, the active balancing board 6 activates the energy transfer mechanism to transfer the energy from the high-voltage cell to the low-voltage cell. This process can be performed in the charging, discharging, and static states of the battery pack body 12, ensuring voltage consistency throughout its entire lifespan.

[0047] The battery casing 4 is equipped with casing terminals 5. Inside the battery pack body 12, the positive and negative terminals are led to the casing terminals 5 via battery-to-casing terminal connection wires 8, serving as ports for external charging and discharging output. The casing terminals 5 adopt a standard threaded hole or bolt structure, facilitating the connection of external loads or chargers by the user.

[0048] Users can connect multiple 12.8V battery packs of this embodiment in series (e.g., four in series to obtain 48V) or in parallel to increase capacity via the casing terminal 5, and quickly assemble them into an energy storage system of the required specifications.

[0049] Polarity markings: The outer surface of the battery casing 4 is marked with polarity markings such as "+" and "-" corresponding to the positive and negative terminals of the battery cell 1, to guide users to connect the wires correctly and prevent misoperation.

[0050] During use, when the battery pack body 12 is charging, the active equalization board 6 monitors the voltage of each cell in real time. If it detects that the voltage of a cell has reached a set threshold first, it transfers some of the energy of that cell to other cells with lower voltages, thus allowing the entire battery pack body 12 to continue charging until all cells are fully charged. Similarly, when discharging or resting, the equalization board continues to work to eliminate the voltage difference between cells, ensuring that the battery pack body 12 always maintains its optimal operating condition, extending its service life and improving safety.

[0051] Example 2

[0052] like Figure 2As shown, the battery pack body 12 is specifically an active balancing plate battery pack composed of components from Embodiment 1, including an active balancing plate 7 and multiple battery cells 1. The battery pack body 12 is provided with battery pack connecting posts 11, and multiple battery pack bodies 12 are connected to each other via battery pack connecting lines 13 through the battery pack connecting posts 11. The multiple battery pack bodies 12 are connected in series via battery pack connecting lines 13. After being connected in series, the multiple battery pack bodies 12 are provided with a high-voltage positive output line 14 and a negative output line 15. Multiple battery pack bodies 12 connected in series externally form a high-voltage output battery pack. Different numbers of battery pack bodies 12 can be matched according to the needs of the electrical appliance; the number is not limited and can be two or more. Figure 2 Taking the five-cell battery pack as an example, it does not mean that only five cells can be connected.

[0053] Example 3

[0054] like Figure 3 As shown, the battery pack body 12 is specifically an active balancing plate battery pack composed of components from Embodiment 1, including an active balancing plate 7 and multiple battery cells 1. The battery pack body 12 is provided with battery pack connecting posts 11, and multiple battery pack bodies 12 are connected to each other via battery pack connecting lines 13 through the battery pack connecting posts 11. The multiple battery pack bodies 12 are connected in parallel via battery pack connecting lines 13. After being connected in parallel, the multiple battery pack bodies 12 are provided with a high-capacity positive output line 14 and a negative output line 15. Multiple battery pack bodies 12 connected in parallel externally form a high-capacity output battery pack. Different numbers of battery pack bodies 12 can be matched according to the needs of the electrical appliance; the number is not limited and can be two or more. Figure 3 Taking the five-cell battery pack as an example, it does not mean that only five cells can be connected.

[0055] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An active balancing plate battery pack, comprising a battery casing (4) and a plurality of battery cells (1) disposed within the battery casing (4), characterized in that, Also includes: An active equalization plate (6) is disposed inside the battery casing (4); The multiple battery cells (1) are electrically connected to each other through battery cell connecting posts (2) and battery cell connecting lines (3) to form a battery pack body (12) connected in series or in parallel. The outer casing terminal (5) is disposed on the battery casing (4). The battery pack body (12) is electrically connected to the outer casing terminal (5) through the battery and outer casing terminal connection line (8) to perform charging and discharging output to the outside. The active balancing plate (6) is electrically connected to each of the battery cells (1); The active equalization plate (6) is independent of the charging and discharging circuit of the battery pack body (12) and is configured to perform equalization adjustment only on each of the battery cells (1).

2. The active balancing plate battery pack according to claim 1, characterized in that, The battery cell (1) is either a lithium iron phosphate battery cell or a lithium iron manganese battery cell.

3. The active balancing plate battery pack according to claim 1, characterized in that, The active balancing board (6) is electrically connected to each of the battery cells (1) through the active balancing board connector (7) and the balancing board connecting line (9).

4. The active balancing plate battery pack according to claim 1, characterized in that, The active balancing plate (6) is configured to reduce the voltage difference between each of the battery cells (1); and the active balancing plate (6) provides equalization protection for each of the battery cells (1) in the charging state, discharging state and static state of the battery pack body (12).

5. The active balancing plate battery pack according to claim 1, characterized in that, The battery cell (1) is configured to be connected in series or in parallel with other battery cells (1) of the same specification via the housing terminal (5) to assemble a battery pack body (12) with high voltage or large capacity.

6. The active balancing plate battery pack according to claim 1, characterized in that, The outer surface of the battery casing (4) is provided with polarity markings corresponding to the positive and negative poles of the battery cell (1).

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