Side heat dissipation battery pack structure

Abstract

The utility model discloses a side heat dissipation battery pack structure which comprises a box body, a battery module and a BDC module, and the box body comprises an upper cover, a cover plate and a cylinder body for assembling the battery module and the BDC module; the upper cover is provided with a charging port, a discharging port and a handle; the battery module is provided with a plurality of battery cells which are connected in series and in parallel and is fixedly arranged in the box body. By adopting the side surface large-area through hole heat dissipation design, a sufficient heat dissipation condition is provided for the battery pack, the internal temperature of the battery is improved, and the service life of the battery core is prolonged; the handle and the heat dissipation surface are designed in a split manner, so that the handle is prevented from being too hot due to heat dissipation of the battery pack. Besides, the assembly surfaces and the joints of the box body of the battery pack are sealed by sealing strips and sealant, so that an IP65-level waterproof effect is achieved, and circuit failure caused by water entering the battery pack can be avoided.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, specifically relating to a side-heat-dissipating battery pack structure. Background Technology

[0002] Existing battery packs typically consist of multiple lithium-ion cells, with a BDC (Bi-directional DC-DC Converter) module inside to monitor the lithium batteries. In existing battery pack structures, the battery management system is usually fixedly installed together with the lithium battery pack. This structure is not very safe, and during battery pack operation, the heat generated by the battery pack and management system can affect battery life and even cause safety accidents.

[0003] Traditional BDC top-cover air-cooled battery pack structures are used for high-capacity battery packs (such as Chinese patent application publication number CN209249523U). Small-capacity battery packs do not require a fan and use natural heat dissipation to save costs. The original structure uses the top cover for heat dissipation, but the top cover gets quite hot. Since the handle is located on the top cover, the heat from the top cover is conducted to the handle, causing the handle temperature to rise. It takes time for the handle to cool down to a suitable temperature before it can be picked up and used, resulting in wasted time. Summary of the Invention

[0004] In view of the above, this utility model provides a side-heating battery pack structure, which adopts a separate design for the handle and the heat dissipation surface to avoid the handle from overheating due to the heat dissipation of the battery pack.

[0005] A side-heat-dissipating battery pack structure includes a housing, a BDC module, and a battery module. The battery module and the BDC module are both installed and fixed in the housing. The BDC module is connected to the battery module for monitoring and controlling the operation of the battery module.

[0006] The housing includes a top cover, a cover plate, and a cylindrical body for accommodating the BDC module and battery module. The top cover is detachably installed and fixed on the top of the cylindrical body. The top cover is provided with a charging port, a discharging port, and a handle. The cover plate is installed on one side of the cylindrical body. It is a detachable structure and has multiple heat dissipation holes. The BDC module is installed inside the cover plate.

[0007] Furthermore, the battery module includes a PCB connection board and battery cells. The tabs of the battery cells are soldered to the PCB connection board, and foam is provided between the tabs of the battery cells. The battery module is fixed inside the cylinder of the housing by potting glue.

[0008] Furthermore, the handle is equipped with a 4G module, which is installed outside the cylinder body, saving internal space of the box and eliminating the need to consider the heat dissipation requirements of the module inside the box.

[0009] Furthermore, the BDC module includes a mounting bracket, a sealing strip, a PCBA board, and a heat sink. The mounting bracket is fixed to the cover plate via a connector, the PCBA board is fixedly connected to the heat sink, and the other side of the heat sink is fixed to the mounting bracket, so that the heat sink is located between the PCBA board and the mounting bracket. The sealing strip is located between the mounting bracket and the heat sink. In the installed state, it is in a compressed state, so that the battery pack structure is sealed to achieve an IP65 waterproof effect.

[0010] Furthermore, the BDC module and the battery module are separated by a sheet metal partition, which serves to fix the BDC module.

[0011] Furthermore, the heat sink is attached to the surface of the PCBA board to dissipate the heat from the key power devices on the PCBA board through the heat dissipation holes of the cover plate, so that the heat of the entire battery pack is transferred from the battery module to the BDC module and then to the cover plate on the side of the housing.

[0012] Furthermore, the BDC module is a lithium battery management system with intelligent bidirectional DC-DC conversion function, which has charge and discharge control function, voltage, current and temperature detection and protection function, short circuit protection function, SOC (State of Charge) calculation function and charging equalization function.

[0013] Furthermore, the top cover is connected to the edge of the cylinder by screws and sealed with sealant, so that the battery pack structure meets the IP65 waterproof rating.

[0014] Based on the above technical solution, this utility model has the following beneficial technical effects:

[0015] 1. Excellent waterproof performance; This utility model has a waterproof function because the top cover of the box is connected to the edge of the cylinder by screws and sealed with sealant. A sealing strip is added at the connection between the heat sink and the mounting bracket of the BDC module. This makes the side heat dissipation battery pack structure meet the IP65 waterproof rating, so as to avoid damage to the internal structure of the box due to water ingress.

[0016] 2. Good heat dissipation effect; This utility model adopts a natural cooling heat dissipation method, that is, through a side heat dissipation structure with a larger heat dissipation area, it provides sufficient conditions for heat dissipation inside the battery pack. It also reduces fan parts, simplifies assembly and maintenance, and helps to reduce the cost of battery pack.

[0017] 3. Structural integration for easier assembly: The top cover and cover plate of this utility model can be detachably installed on the body of the casing. The BDC module, heat sink and mounting bracket are integrated and set on the side of the casing. This part can be directly installed and removed from the cover plate position, which improves the system integration, reduces the number of parts, reduces process steps, and makes battery pack assembly more convenient. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the external structure of the side-heat-dissipating battery pack in an embodiment of this utility model.

[0019] Figure 2 This is an exploded view of the casing structure of the side-heat-dissipating battery pack in an embodiment of this utility model.

[0020] Figure 3 This is an exploded view of the side-heating battery pack after removing the battery module and BDC module in an embodiment of this utility model.

[0021] Figure 4 This is an exploded view of the overall structure of the side-heat-dissipating battery pack in an embodiment of this utility model.

[0022] In the diagram: 1—box body, 2—top cover, 21—handle, 22—charging port, 23—discharging port, 31—cover plate, 32—mounting bracket, 33—sealing strip, 34—PCBA board, 35—heat sink, 36—sheet metal partition, 4—battery module, 41—battery cell, 42—foam, 43—PCB connection board. Detailed Implementation

[0023] To describe the present invention in more detail, the technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] like Figures 1-4 As shown, the side-heat-dissipating battery pack structure of this utility model includes a housing 1, a top cover 2, a BDC module, and a battery module 4. The battery module 4 and the BDC module are installed inside the housing 1. The top cover 2 is provided with a charging port 22 for an external charger, a discharging port 23 for an external electric two-wheeler, and a handle 21.

[0025] Specifically, in a preferred embodiment, the external charger charging port 22 and the external power vehicle discharge port 23 are evenly distributed side by side on the surface of the upper cover 2, and both are waterproof. The upper cover 2 is provided with a handle 21 for mounting a 4G module, and the 4G module can be seen after the handle 21 is removed.

[0026] Specifically, in a preferred embodiment, the edges of the top cover 2 and the housing 1 are connected by connectors (screws), with evenly distributed connecting holes. Sealant is used to reinforce the edges for sealing, enabling the side-mounted heat dissipation battery pack structure to achieve an IP65 waterproof rating. The 4G module is located on the outside of the housing, integrated with the handle, and installed outside the casing, saving internal space in the housing 1 and eliminating the need to consider heat dissipation requirements for the module within the housing 1.

[0027] like Figure 4As shown, in a preferred embodiment, the battery module 4 has multiple battery cells 41. This embodiment uses multiple 40Ah pouch battery cells in its battery pack structure. The battery module 4 uses a PCB (Printed Circuit Board) as a connecting board, and the tabs of each pouch battery cell are connected in series and soldered to the PCB connecting board 43. Foam 42 is provided between the tabs of the pouch battery cells for a fixing effect. The battery module 4 is fixed inside the housing 1 using a potting compound method.

[0028] like Figure 2 As shown, in a preferred embodiment, the BDC module 3 includes a cover plate 31, a mounting bracket 32, a sealing strip 33, a PCBA (Printed Circuit Board Assembly) board 34, and a heat sink 35. Since the PCBA board 34 has more power components than the BMS (Battery Management System) board, it generates more heat and has higher heat dissipation requirements, necessitating a focus on heat dissipation design. The cover plate 31 has multiple small hexagonal ventilation holes on its surface, providing maximum natural heat dissipation conditions on the side of the battery pack structure, which is superior to traditional top cover ventilation designs. The cover plate 31 is located on the outermost side of the BDC module and is fixed to the entire assembly in the housing 1 using Phillips head countersunk screws, and its material color is the same as the housing.

[0029] like Figure 3 As shown, the BDC module is installed inside the housing 1 and is separated from the battery module 4 by a sheet metal partition 36. The partition serves to fix the BDC module. It should be understood that the specific shape of the sheet metal partition 36 should not be a limitation of this utility model.

[0030] like Figure 4 As shown, the PCBA board 34 has positioning holes along its edge, which are connected to the heat sink 35 for positioning. The heat sink 35 has screw holes, which are fixedly connected to the PCBA board 34 by screws. The positioning holes and screw holes are set in a corresponding manner and are evenly and symmetrically distributed.

[0031] The PCBA board 34 includes a heat sink for MOSFET heat dissipation. The MOSFET heat sink is mounted and fixed to the PCBA board 34 by connectors (screws). A copper pillar is used to mount the heat sink 35 between the PCBA board 34 and the mounting bracket 32. A sealing strip 33 is provided between the mounting bracket 32 ​​and the heat sink 35. In the installed state, the sealing strip 33 is in a compressed state. The heat sink 35 is in contact with the upper surface of the PCBA board 34, allowing the PCBA board 34 to effectively dissipate heat during operation. The mounting bracket 32 ​​and the sealing strip 33 are mounted and fixed above the PCBA board 34 and the heat sink 35. The cover plate 31 has screw holes, and connectors are used to fix the cover plate 31 and other components of the PCBA board 34 to the side of the battery pack housing 1.

[0032] The heat sink 35 dissipates heat from key power components on the PCBA board 34 through the ventilation holes on the side cover 31 of the battery pack housing 1. The heat sink 35 is made of 6063 aluminum alloy, providing excellent heat dissipation. The sealing strip 33 is made of rubber, ensuring a good seal, with a 2:1 ratio between the long and short sides. Nylon rivets secure Mylar sheets to the back of the PCBA board 34 for insulation. The sealing strip 33 isolates the BDC module's heat dissipation from the external environment, achieving an IP65 waterproof rating for the side-heated battery pack structure.

[0033] The battery sampling harness is connected to the B-end port of the PCBA board 34 via a harness connector, enabling the PCBA board 34 to effectively monitor the charging and discharging of the battery module 4. The battery module 4 is also connected to the battery temperature and voltage sampling interface of the PCBA board 34 for battery voltage detection, temperature detection, current detection, and protection. Alarm and protection parameters can be set via a host computer.

[0034] Charging port 22 connects to the positive and negative P-terminal interfaces of PCBA board 34 via a charging cable harness to collect charging voltage and other information. Charging port 22 provides RS485 communication connectivity during operation, allowing isolated communication with a PC or charger via RS485, supporting a maximum baud rate of 115200, and uploading the collected information. Discharging port 23 connects to the P+ and P- terminals of PCBA board 34 via a charging cable harness to collect discharging voltage and other information.

[0035] The 4G module installed inside the handle 21 is connected to the 4G module interface of the PCBA board 34 to upload battery information to the background for easy management and monitoring.

[0036] In other embodiments of the side-heat-dissipating battery pack structure, the battery module 4 may not be fixed by potting, but instead a pressure strip is used, and it is fixed to the housing 1 with screws to secure the battery cell. Meanwhile, the side shock-absorbing foam 42 between the outer periphery of the battery module 4 and the inner side of the housing 1, as well as the bottom shock-absorbing foam located on the inner bottom surface of the housing 1, serve to absorb shock and provide fixation.

[0037] In other embodiments of the side-heating battery pack structure, the battery module 4 may also employ one or more hard-pack cells 41 or cells 41 of different sizes that conform to the battery pack structure.

[0038] In other embodiments of the side-heating battery pack structure, the BDC module can be positioned in any direction on the side, and the corresponding heat dissipation cover 31 can also be positioned in four ways.

[0039] In other embodiments of the side-heated battery pack structure, the sheet metal partition 36 may not be provided between the BDC module and the battery module 4, and other forms of design may be used to achieve insulation.

[0040] In other embodiments of the side-heating battery pack structure, the housing 1 can also be a square or a structure with four equal walls, that is, compared with the above embodiments, the length and width of the four side walls of the housing 1 are not equal.

[0041] In other embodiments of the side-heated battery pack structure, the handle 21 may also omit the 4G module device and be used only for handling and carrying, and the battery pack does not use 4G communication function.

[0042] In other embodiments of the side-heating battery pack structure, the shape of the handle 21 is not specifically required and can be different from the wave-shaped handle in the illustrated embodiment. The handle 21 and the heat dissipation cover 31 can also be set in non-corresponding directions.

[0043] The above description of the embodiments is provided to enable those skilled in the art to understand and apply the present invention. Those skilled in the art can readily make various modifications to the above embodiments and apply the general principles described herein to other embodiments without creative effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made to the present invention by those skilled in the art based on the disclosure of the present invention should be within the protection scope of the present invention.

Claims

1. A side-heat-dissipating battery pack structure, comprising a housing, a BDC module, and a battery module, wherein the battery module and the BDC module are both installed and fixed within the housing, and the BDC module is connected to the battery module for monitoring and controlling the operation of the battery module, characterized in that: The housing includes a top cover, a cover plate, and a cylindrical body for accommodating the BDC module and battery module. The top cover is detachably installed and fixed on the top of the cylindrical body. The top cover is provided with a charging port, a discharging port, and a handle. The cover plate is installed on one side of the cylindrical body. It is a detachable structure and has multiple heat dissipation holes. The BDC module is installed inside the cover plate.

2. The side-heat-dissipating battery pack structure according to claim 1, characterized in that: The battery module includes a PCB connection board and battery cells. The battery cells are soldered to the PCB connection board, and foam is provided between the battery cells. The battery module is fixed inside the casing by potting glue.

3. The side-heat-dissipating battery pack structure according to claim 1, characterized in that: The handle is equipped with a 4G module, which is installed outside the cylinder body, saving internal space of the box.

4. The side-heat-dissipating battery pack structure according to claim 1, characterized in that: The BDC module includes a mounting bracket, a sealing strip, a PCBA board, and a heat sink. The mounting bracket is fixed to the cover plate via a connector, the PCBA board is fixedly connected to the heat sink, and the other side of the heat sink is fixed to the mounting bracket, so that the heat sink is located between the PCBA board and the mounting bracket. The sealing strip is located between the mounting bracket and the heat sink. In the installed state, it is in a compressed state, so that the battery pack structure is sealed to achieve an IP65 waterproof effect.

5. The side-heat-dissipating battery pack structure according to claim 1, characterized in that: The BDC module and the battery module are separated by a sheet metal partition, which serves to fix the BDC module.

6. The side-heat-dissipating battery pack structure according to claim 4, characterized in that: The heat sink is attached to the surface of the PCBA board and is used to dissipate the heat of the key power devices on the PCBA board through the heat dissipation holes of the cover plate, so that the heat of the entire battery pack is transferred from the battery module to the BDC module and then to the cover plate on the side of the box.

7. The side-heat-dissipating battery pack structure according to claim 1, characterized in that: The BDC module is a lithium battery management system with intelligent bidirectional DC-DC conversion function. It has charge and discharge control function, voltage, current and temperature detection and protection function, short circuit protection function, SOC calculation function and charging equalization function.

8. The side-heat-dissipating battery pack structure according to claim 1, characterized in that: The top cover is connected to the edge of the cylinder by screws and sealed with sealant, so that the battery pack structure meets the IP65 waterproof rating.

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