Control protection equipment for active equalization of battery
By using a combination structure of a cooling ring box, coolant, and thermally conductive copper rod in the battery active balancing control and protection device, the problem of high-temperature damage to the device was solved, and temperature control and stable operation of the device were achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN LANKE NEW ENERGY TECH CO LTD
- Filing Date
- 2025-05-23
- Publication Date
- 2026-05-01
AI Technical Summary
Existing battery active balancing control and protection equipment generates high temperatures during operation, and sustained high temperatures can easily lead to equipment damage.
The device employs a combination structure of a cooling ring box, coolant, and thermally conductive copper rods. The cooling is achieved through heat conduction via the thermally conductive copper rods and by utilizing the coolant. Combined with the support rods and adhesive layers, this ensures stable external installation of the equipment.
Effectively control equipment temperature to prevent high-temperature damage and improve equipment lifespan and reliability.
Smart Images
Figure CN224192307U_ABST
Abstract
Description
A battery active balancing control and protection device Technical Field
[0001] This utility model relates to the field of battery control and protection technology, specifically to a battery active balancing control and protection device. Background Technology
[0002] The stability and safety of lithium-ion batteries require careful consideration. If a lithium-ion battery cell (or battery unit) cannot operate within its limited state of charge (SOC) range, its capacity may decrease. Exceeding its SOC limit can damage the battery, leading to unstable and unsafe behavior. To ensure the safety, lifespan, and capacity of lithium-ion battery cells, their SOC limits must be carefully set.
[0003] To maximize the usable capacity and lifespan of each cell, cell degradation must be minimized while all cells operate within their State of Charge (SOC) range. In practice, simply keeping cells within a limited SOC range without intervention can prevent degradation, but their usable capacity will still gradually decrease due to SOC mismatch. This is because charging or discharging must stop when a cell reaches its upper or lower SOC limit, even if other cells still have remaining capacity. Most modern Battery Management Systems (BMS) include passive balancing, which periodically adjusts the SOC of all series-connected cells to a uniform value. Passive balancing involves connecting a resistor to each cell as needed to dissipate energy and reduce the cell's SOC. As an alternative to passive balancing, active balancing uses power conversion to redistribute charge among the cells in the battery pack. This method achieves higher balancing current, lower heat generation, faster balancing time, higher energy efficiency, and a longer operating range, even if initially well-matched, as cells in a battery pack will experience capacity changes over time. For example, cells in different physical locations within a battery pack may experience varying temperatures or pressures, affecting their capacity. Furthermore, slight manufacturing variations can amplify over time, causing capacity differences. Understanding these capacity differences is crucial for understanding the sources of SOC imbalance. Changes in a battery cell's SOC primarily depend on the cell's capacity and the current flowing into / out of the cell. For instance, a 4Ahr battery receiving 1A of current over one hour will experience a 25% change in SOC; similarly, a 2Ahr battery will experience a 50% change in SOC.
[0004] Maintaining SOC balance requires adjusting the charging / discharging current of each cell based on its capacity. Parallel-connected cells do this automatically, as current flows from the high-SOC cell to the low-SOC cell. However, series-connected cells have the same current, which can cause imbalance if there are capacity differences. This is important because most battery packs have series cell connections, and may also include parallel connections. SOC adjustment applies to both passive and active balancing. Passive balancing reduces cell SOC by connecting a resistive load (typically a BJT or MOSFET transistor) to an individual cell. Active balancing uses a switching mode to redistribute energy among the cells in the battery pack. Due to increased implementation complexity and cost, traditional active balancing is typically limited to battery systems with extremely high power levels and / or large capacities, such as batteries in power plants, commercial energy storage systems (ESS), residential energy storage systems, and battery backup devices. Newer solutions offer significantly reduced cost and complexity, enabling a growing number of applications to leverage the advantages of active balancing.
[0005] Passive balancing current is typically limited to 0.25A, while active balancing can reach up to 6A. Higher balancing current allows for faster balancing, supporting larger capacity battery cells, such as those used in ESS (Emergency Storage Systems). Furthermore, higher balancing current supports rapid system operation, where balancing must also be completed quickly. Passive balancing consumes energy, while active balancing redistributes energy, significantly improving energy efficiency. Passive balancing is only feasible during charging cycles because operation during discharge exacerbates energy consumption in the battery pack. Active balancing can be performed during either charging or discharging. Active balancing during discharge allows for more balancing time and enables charge transfer from stronger to weaker cells, thus extending the battery pack's runtime. In summary, active balancing is more advantageous for applications requiring faster balancing, limited thermal load, improved energy efficiency, and increased system runtime. However, existing active battery balancing control and protection devices generate high temperatures during operation, and sustained high temperatures can easily damage these devices. Summary of the Invention
[0006] The purpose of this invention is to provide a control and protection device for active battery balancing, which solves the problem that existing active battery balancing control and protection devices generate high temperatures during operation, and that sustained high temperatures can easily damage the active battery balancing control and protection device.
[0007] Technical solution
[0008] To achieve the above objectives, this utility model provides the following technical solution: a battery active balancing control and protection device, comprising a battery balancing control and protection mechanism body, a connecting pin structure connected to the bottom of the battery balancing control and protection mechanism body, a cooling ring box provided on the outer surface of the battery balancing control and protection mechanism body, a heat-conducting copper rod attached to the surface of the battery balancing control and protection mechanism body, the end of the heat-conducting copper rod away from the battery balancing control and protection mechanism body penetrating through the cooling ring box and extending into the interior of the cooling ring box, the interior of the cooling ring box filled with coolant, a support rod fixedly connected to the lower surface of the cooling ring box, and a support base plate fixedly connected to the bottom end of the support rod. After the connecting pin structure is soldered onto the circuit board, the cooling ring box is placed downwards on the outer surface of the battery balancing control and protection mechanism body, and is bonded to the circuit board surface using an adhesive layer. When the battery balancing control and protection mechanism body generates temperature during operation, the temperature is conducted through the heat-conducting copper rod and cooled by the coolant.
[0009] Furthermore, the lower surface of the supporting base plate is coated with an adhesive layer.
[0010] Furthermore, a coolant observation window is provided on the left side of the cooling annular box.
[0011] Furthermore, the top of the cooling ring box is provided with a coolant filling port that communicates with the inside of the cooling ring box, and a sealing rubber plug is snapped into the inside of the coolant filling port.
[0012] Furthermore, the surface of the connection pin structure is coated with an anti-corrosion coating.
[0013] Furthermore, the number of the heat-conducting copper rods is two sets, with three heat-conducting copper rods in each set.
[0014] This invention provides a control and protection device for active battery balancing. It has the following beneficial effects:
[0015] This battery active balancing control and protection device, through the cooperation of a cooling ring box, coolant, and thermally conductive copper rod, can control the temperature of the main body of the battery balancing control and protection mechanism. Through the cooperation of support rod, support base plate, and adhesive layer, the cooling ring box can be set on the outside of the main body of the battery balancing control and protection mechanism. This solves the problem that existing battery active balancing control and protection devices generate high temperatures during operation, and that sustained high temperatures can easily damage the battery active balancing control and protection device. Attached Figure Description
[0016] Figure 1 is a cross-sectional view of the structure of this utility model;
[0017] Figure 2 is a front view of the structure of this utility model.
[0018] The components include: 1. Battery equalization control and protection mechanism body; 2. Connecting pin structure; 3. Cooling ring box; 4. Coolant; 5. Thermally conductive copper rod; 6. Support rod; 7. Support base plate; 8. Adhesive layer; 9. Coolant observation window; 10. Coolant filling port; and 11. Sealing rubber plug. Detailed Implementation
[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0020] As shown in Figures 1-2, this utility model embodiment provides a battery active balancing control and protection device, including a battery balancing control and protection mechanism body 1, a connection pin structure 2 connected to the bottom of the battery balancing control and protection mechanism body 1, and an anti-corrosion coating on the surface of the connection pin structure 2.
[0021] In the first embodiment of this utility model, a cooling ring box 3 is provided on the outer surface of the main body 1 of the battery equalization control and protection mechanism. A coolant observation window 9 is provided on the left side of the cooling ring box 3. A coolant filling port 10 communicating with the inside of the cooling ring box 3 is provided on the top of the cooling ring box 3. A sealing rubber plug 11 is snapped into the inside of the coolant filling port 10. A heat-conducting copper rod 5 is attached to the surface of the main body 1 of the battery equalization control and protection mechanism. There are two sets of heat-conducting copper rods 5, and each set has three heat-conducting copper rods 5.
[0022] In the second embodiment of this utility model, one end of the heat-conducting copper rod 5, away from the main body 1 of the battery balancing control and protection mechanism, penetrates through the cooling ring box 3 and extends into the interior of the cooling ring box 3. The interior of the cooling ring box 3 is filled with coolant 4. A support rod 6 is fixedly connected to the lower surface of the cooling ring box 3, and a support base plate 7 is fixedly connected to the bottom end of the support rod 6. An adhesive layer 8 is coated on the lower surface of the support base plate 7. Through the cooperation of the cooling ring box 3, coolant 4, and heat-conducting copper rod 5, the temperature of the main body 1 of the battery balancing control and protection mechanism can be controlled. Through the cooperation of the support rod 6, support base plate 7, and adhesive layer 8, the cooling ring box 3 can be set outside the main body 1 of the battery balancing control and protection mechanism, which solves the problem that existing battery active balancing control and protection equipment generates high temperatures during operation, and that continuous high temperatures can easily damage the battery active balancing control and protection equipment.
[0023] Working principle: After the connecting pin structure 2 is soldered onto the circuit board, the cooling ring box 3 is placed on the outer surface of the battery equalization control and protection mechanism body 1 and placed downwards. It is bonded to the circuit board surface by the adhesive layer 8. When the battery equalization control and protection mechanism body 1 generates temperature during operation, the temperature will be conducted through the heat-conducting copper rod 5 and cooled by the coolant 4.
[0024] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A battery active balancing control protection device, comprising a battery balancing control protection mechanism body (1), characterized in that: The bottom of the battery equalization control and protection mechanism body (1) is connected to a connection pin structure (2). A cooling ring box (3) is provided on the outer surface of the battery equalization control and protection mechanism body (1). A heat-conducting copper rod (5) is attached to the surface of the battery equalization control and protection mechanism body (1). The end of the heat-conducting copper rod (5) away from the battery equalization control and protection mechanism body (1) passes through the cooling ring box (3) and extends into the interior of the cooling ring box (3). The interior of the cooling ring box (3) is filled with coolant (4). A support rod (6) is fixedly connected to the lower surface of the cooling ring box (3). A support base plate (7) is fixedly connected to the bottom end of the support rod (6).
2. The battery active balancing control protection device according to claim 1, wherein: The lower surface of the supporting base plate (7) is coated with an adhesive layer (8).
3. The battery active balancing control protection device according to claim 1, wherein: The cooling ring box (3) is provided with a coolant observation window (9) on the left side.
4. The control and protection device for active balancing of batteries according to claim 1, characterized in that: The top of the cooling ring box (3) is provided with a coolant filling port (10) that communicates with the inside of the cooling ring box (3).
5. The control and protection device for active balancing of batteries according to claim 4, characterized in that: The coolant filling port (10) is fitted with a sealing rubber plug (11).
6. The battery active balancing control and protection device according to claim 1, characterized in that: The surface of the connection pin structure (2) is coated with an anti-rust coating.
7. The control and protection device for active balancing of batteries according to claim 1, characterized in that: The number of the heat-conducting copper rods (5) is two sets, and the number of heat-conducting copper rods (5) in each set is three.