Double-duct battery pack and electric device using same

Abstract

The utility model relates to battery technology field provides a kind of double air duct battery pack and electrical device, double air duct battery pack includes: box;First electric core module and second electric core module, along the length direction interval setting in box, first electric core module and the front panel between box are equipped with first air duct, first electric core module and second electric core module between are equipped with second air duct, the first side plate of box is equipped with air inlet, the second side plate of box is equipped with air outlet, first air duct, second air duct are all communicated between air inlet and air outlet;Airflow drive assembly, setting between first electric core module and second side plate, airflow drive assembly is fluidly connected in first air duct and second air duct respectively, setting between first air duct and second air duct and with air outlet corresponding arrangement;Circuit board, setting in first air duct, circuit board is integrated with the power supply interface of airflow drive assembly.The utility model can realize the effect of giving consideration to the uniformity of electric core heat dissipation and internal space utilization.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a dual-airflow battery pack and power supply device. Background Technology

[0002] In existing battery packs, the cell modules are mostly arranged closely together, and the battery casing size is fixed, making it difficult to reserve effective heat dissipation space. Generally, heat dissipation is achieved by openings in the side wall of the casing or a single air duct. The airflow inside the casing is chaotic, with high flow resistance and low heat exchange efficiency.

[0003] Under high-load operating conditions, heat dissipation blind spots can easily form in the cell bonding area and the sealed areas inside the battery pack. Heat accumulates and is difficult to dissipate, causing the battery to overheat, resulting in large temperature differences between individual cells, accelerating cell aging, shortening battery life, and in severe cases, leading to safety hazards such as cell bulging and thermal runaway. At the same time, existing battery packs typically have heat-generating components such as circuit boards arranged separately, making it impossible to achieve simultaneous heat dissipation using the airflow around the cells. This requires additional space inside the battery pack, further exacerbating the problem of limited internal space. Utility Model Content

[0004] This utility model provides a dual-airflow battery pack and power supply device to solve the defects of low heat dissipation efficiency, large temperature difference between battery cells, and large space occupation of circuit board layout in the prior art, and achieve the technical effect of balancing uniform heat dissipation of battery cells and efficient use of internal space.

[0005] This utility model provides a dual-airflow battery pack, comprising: Box; A first battery cell module and a second battery cell module are spaced apart inside the housing along the length of the housing. A first air duct is provided between the first battery cell module and the front panel of the housing, and a second air duct is provided between the first battery cell module and the second battery cell module. An air inlet is provided on the first side panel of the housing, and an air outlet is provided on the second side panel of the housing. The first air duct and the second air duct are both connected between the air inlet and the air outlet. An airflow drive component is disposed between the first cell module and the second side plate. The airflow drive component is fluidly connected to the first air duct and the second air duct respectively. The airflow drive component is disposed between the first air duct and the second air duct and is correspondingly disposed to the air outlet. A circuit board is disposed within the first air duct, and the circuit board integrates the power supply interface of the airflow drive component.

[0006] According to the present invention, a dual-airflow battery pack includes a first cell module and a second cell module, each comprising a plurality of cells. The number of cells in the first cell module is less than the number of cells in the second cell module. An accommodating area is formed between the first cell module and the second side plate for mounting the airflow drive assembly.

[0007] According to the present invention, a dual-air duct battery pack includes an airflow drive assembly comprising a first drive member and a second drive member, the first drive member and the second drive member being separately disposed in the receiving area, the air inlet side of the first drive member being fluidly connected to the first air duct, and the air inlet side of the second drive member being fluidly connected to the second air duct.

[0008] According to the present invention, a dual-airflow battery pack further includes: a temperature sensor disposed inside the housing; a control unit disposed on the circuit board; the temperature sensor being electrically connected to the control unit; and the control unit being configured to control the start and stop of the airflow drive component based on the temperature data detected by the temperature sensor.

[0009] According to the present invention, a dual-airflow battery pack is provided, wherein the temperature sensor is disposed on the surface of the cells of the first cell module and the second cell module and / or in the first airflow channel and the second airflow channel.

[0010] According to the present invention, a dual-air duct battery pack is provided, wherein the first side plate is provided with a first air inlet, the second side plate is provided with a first air outlet, and at least one of the first air inlet and the first air outlet is arranged in a staggered manner with respect to the first air duct.

[0011] According to the present invention, a dual-air duct battery pack is provided, wherein the first side plate is provided with a second air inlet, the second side plate is provided with a second air outlet, and at least one of the second air inlet and the second air outlet is arranged in a staggered manner with respect to the second air duct.

[0012] According to the present invention, a dual-air duct battery pack further includes a protective breathable membrane disposed on the inner side of the air inlet.

[0013] According to the present invention, a dual-air duct battery pack includes an air inlet and / or an air outlet comprising a plurality of spaced ventilation holes.

[0014] This utility model also provides an electrical device, including the dual-duct battery pack described above.

[0015] The dual-airflow battery pack and power supply device provided by this utility model utilizes the gap between the first cell module and the front panel of the casing to form a first airflow channel, and utilizes the gap between the first cell module and the second cell module to form a second airflow channel, thus constructing two independent convection cooling airflow channels. The airflow enters from the air inlet and flows through the first airflow channel and the second airflow channel respectively. It can not only dissipate heat in the area of ​​the front of the casing opposite to the first cell module, but also dissipate heat in each cell of the first cell module and the second cell module. The heat dissipation coverage is large, which can reduce heat dissipation blind spots, improve the temperature uniformity of each cell, reduce the temperature difference between cells, and alleviate the risk of cell degradation caused by local overheating.

[0016] The airflow drive component is arranged between the first air duct and the second air duct and corresponds to the air outlet. It can simultaneously generate a suction effect on the two air ducts on both sides, guiding the hot air in the two air ducts to be discharged from the air outlet. This layout makes full use of the space between the first cell module and the second side plate, which is conducive to maintaining the overall compact structure of the battery pack. At the same time, it can quickly discharge hot airflow and reduce heat retention in the box.

[0017] The circuit board is located inside the first air duct. The circuit board integrates the power supply interface of the airflow drive component. On the one hand, it can provide a power connection point for the airflow drive component, realizing the power supply and control of the airflow drive component. On the other hand, the cooling airflow flowing in the first air duct can simultaneously cool the circuit board and its onboard power devices. Without adding additional heat dissipation components, it can simultaneously dissipate heat from the battery cells and circuit board components, improving the overall thermal management capability of the battery pack. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is one of the structural schematic diagrams of the dual-airflow battery pack provided by this utility model.

[0020] Figure 2 This is the second structural schematic diagram of the dual-airflow battery pack provided by this utility model.

[0021] Figure label: 100. Housing; 101. Front panel; 102. Rear panel; 103. First side panel; 104. Second side panel; 110. First battery cell module; 120. Second battery cell module; 130. First air duct; 140. Second air duct; 150. First air inlet; 151. First air outlet; 152. Second air inlet; 153. Second air outlet; 160. First driving component; 161. Second driving component; 170. Receiving area; 180. Cable outlet; 190. Circuit board. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] In the description of this utility model, it should be understood that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] In this utility model, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0026] The following is combined Figure 1 and Figure 2 The present invention describes a dual-airflow battery pack, which includes a housing 100, a cell module disposed within the housing 100, an airflow duct, an airflow drive assembly, and a circuit board 190.

[0027] The housing 100 contains a first battery cell module 110 and a second battery cell module 120, which are spaced apart along the length of the housing 100. By optimizing the assembly dimensions between the front panel 101 and the rear panel 102 of the housing 100, the first battery cell module 110 and the second battery cell module 120 are arranged horizontally at intervals within the housing 100, with channels for airflow reserved between the battery cell modules, providing a structural basis for the formation of the air duct.

[0028] A first air duct 130 is provided between the first battery cell module 110 and the front panel 101 of the housing 100, and a second air duct 140 is provided between the first battery cell module 110 and the second battery cell module 120. For example... Figure 1As shown, the first air duct 130 and the second air duct 140 are arranged at intervals along the length of the housing 100. The first air duct 130, the second air duct 140, and the two battery cell modules are arranged in the same height space of the housing 100, which satisfies the heat dissipation requirements while making the overall structure of the battery pack compact and thin. The first air duct 130 and the second air duct 140 both extend along the width of the housing 100, that is, along the stacking direction of the battery cell modules. The two ends of the first air duct 130 and the second air duct 140 are connected to the air inlet and the air outlet, respectively. An airflow driving component is also provided on the air outlet side. Relying on the suction effect of the airflow driving component, external cold air flows into the first air duct 130 and the second air duct 140 through the air inlet, flows in the air duct and carries away the heat generated by the battery cells. The hot air is finally discharged from the housing 100 through the air outlet. The first air duct 130 and the second air duct 140 can work together to dissipate heat from the first cell module 110, and the second air duct 140 dissipates heat from the second cell module 120. This improves the overall heat dissipation uniformity of the cell, reduces the temperature difference between different cells, reduces the risk of local overcharging and over-discharging of the cell, and alleviates the hidden danger of thermal runaway of lithium battery.

[0029] The enclosure 100 is formed by a front panel 101, a rear panel 102, a first side panel 103, and a second side panel 104, forming a circumferentially enclosed structure. The front panel 101 and the rear panel 102 are located at both ends along the length of the enclosure 100, and the first side panel 103 and the second side panel 104 are located at both ends along the width of the enclosure 100. The first side panel 103 is provided with an air inlet, and the second side panel 104 is provided with an air outlet. The first air duct 130 and the second air duct 140 are both connected between the air inlet and the air outlet, forming a complete forced convection path.

[0030] An airflow drive assembly is provided between the first battery cell module 110 and the second side plate 104. The airflow drive assembly can be arranged in the gap between the first battery cell module 110 and the second side plate 104, so that the airflow drive assembly is close to the first air duct 130 and the second air duct 140 on both sides, so as to simultaneously generate a suction effect on the two air ducts and ensure that the heat in the air duct can be discharged from the air outlet in a timely and efficient manner.

[0031] Furthermore, a circuit board 190 is housed within the first air duct 130, and the circuit board 190 integrates the power supply interface for the airflow drive component. Since the airflow drive component is located adjacent to the first air duct 130, the power supply wiring between the circuit board 190 and the airflow drive component can be shortened, simplifying wiring and assembly. The circuit board 190 is situated on the airflow path of the first air duct 130, and the cooling airflow flowing through the first air duct 130 can dissipate heat from the first cell module 110 while also directly cooling the circuit board 190 and its onboard power devices. This arrangement eliminates the need for a separate enclosure 100 for the circuit board 190, avoiding an increase in the overall size of the battery pack and facilitating miniaturization and compact design of the entire battery pack.

[0032] According to one embodiment of the present invention, both the first battery module 110 and the second battery module 120 include a plurality of battery cells. The number of battery cells in the first battery module 110 is less than the number of battery cells in the second battery module 120. A receiving area 170 is formed between the first battery module 110 and the second side plate 104 for mounting an airflow drive component.

[0033] like Figure 2 As shown, in this embodiment, the first battery module 110 has one less battery cell than the second battery module 120. The space freed up by reducing the number of battery cells can be used to form a receiving area 170 between the first battery module 110 and the second side plate 104 to arrange the airflow drive component. This does not require additional space inside the housing 100 and can improve the space utilization of the housing 100.

[0034] For example, the airflow drive assembly includes a first drive member 160 and a second drive member 161, which are disposed separately in the receiving area 170. The air inlet side of the first drive member 160 is fluidly connected to the first air duct 130, and the air inlet side of the second drive member 161 is fluidly connected to the second air duct 140.

[0035] By setting independent first drive components 160 and second drive components 161, the first air duct 130 and the second air duct 140 can be driven to exhaust air respectively, achieving independent control of the airflow in the two air ducts. The second side plate 104 is provided with a first air outlet 151 corresponding to the first drive component 160, and a second air outlet 153 corresponding to the second drive component 161. Hot air from the two air ducts can be discharged outward from their respective air outlets through the corresponding drive components. The first drive component 160 and the second drive component 161 can be separated from each other by a partition. The partition can block the two exhaust airflows, effectively avoiding airflow interference and backflow between the first air duct 130 and the second air duct 140, ensuring stable airflow direction within each air duct, and improving heat dissipation reliability.

[0036] The first drive component 160 and the first air duct 130 can be arranged facing each other (or partially facing each other) or staggered; similarly, the second drive component 161 and the second air duct 140 can be arranged facing each other (or partially facing each other) or staggered, which can be flexibly adjusted according to actual needs. Among them, the first drive component 160 and the second drive component 161 can be miniature DC cooling fans. The structural dimensions of the accommodating area 170 are adapted to the external dimensions of the miniature cooling fan, which can form a limiting constraint on the drive component, ensuring that the drive component is stably assembled, without obvious shaking during operation, and will not squeeze the battery cell module after assembly.

[0037] Optionally, a protective shell may be provided on the outer side of the first driving component 160 and the second driving component 161, or a protective cover may be provided on the top of the first driving component 160 and the second driving component 161. By providing a protective shell or a protective cover to protect the driving components, foreign objects can be prevented from interfering with the operation of the driving components; for example Figure 1 As shown, a cable outlet 180 is provided on the protective shell or protective cover. The wiring harness of the drive unit is led out from the cable outlet 180, which can prevent the wiring harness from getting tangled in the drive unit and improve the reliability and safety of operation.

[0038] It is understandable that the airflow drive component is not limited to setting two drive components. In other examples, only one drive component can be set, and the two air ducts can share the same drive component, which simplifies the structural composition while meeting the heat dissipation requirements.

[0039] According to one embodiment of the present invention, the dual-air duct battery pack further includes: a temperature sensor disposed inside the housing 100, a control unit disposed on the circuit board 190, the temperature sensor being electrically connected to the control unit, and the control unit being configured to control the start and stop of the airflow drive component based on the temperature data detected by the temperature sensor.

[0040] Specifically, the housing 100 houses a BMS (Battery Management System), and the circuit board 190 serves as the hardware carrier for this system. The circuit board 190 integrates a main control chip (i.e., a control unit) capable of controlling the start and stop of the airflow drive components. Temperature sensors collect real-time internal battery temperature data and transmit it to the BMS main control chip. The BMS system has preset critical temperatures for heat dissipation initiation and termination. For example, under normal operating conditions, the critical temperature for heat dissipation initiation can be set to 45°C, and the critical temperature for heat dissipation termination to 35°C. These thresholds can be flexibly adjusted according to battery specifications and actual operating scenarios, and are not limited to the values ​​mentioned above.

[0041] Specifically, when the temperature sensor detects that the internal temperature of the battery has risen to the critical temperature for heat dissipation activation, the BMS controls the power supply circuit of the airflow drive component, and the drive component starts running at full speed, forming forced convection within the two air ducts. Hot air inside the air ducts is quickly discharged from the housing 100 through the air outlet, while cold air from the outside is introduced into the housing 100 through the air inlet, forming a continuous circulating convection heat exchange that carries away the heat accumulated inside the battery. As heat dissipation continues, the internal temperature of the battery gradually decreases. When the detected temperature drops back to the critical temperature for heat dissipation to stop, the BMS disconnects the power supply circuit, and the airflow drive component stops working, completing one intelligent heat dissipation cycle. This avoids the increased energy consumption caused by the continuous operation of the airflow drive component.

[0042] The temperature sensors can be flexibly arranged according to actual needs. For example, the temperature sensors can be attached to the surface of the cells in the first cell module 110 and the second cell module 120 to directly collect the temperature of the cell body and accurately reflect the heating state of the cell. Alternatively, the temperature sensors can be arranged inside the first air duct 130 and the second air duct 140 to collect the temperature of the air flowing inside the air duct and indirectly reflect the overall thermal environment of the battery. Or, the temperature sensors can be deployed at multiple locations on the surface of the cell and inside the air duct to achieve multi-point temperature measurement and improve the comprehensiveness and accuracy of temperature monitoring.

[0043] According to one embodiment of the present invention, the first side plate 103 is provided with a first air inlet 150, and the second side plate 104 is provided with a first air outlet 151. At least one of the first air inlet 150 and the first air outlet 151 is arranged in a staggered manner with the first air duct 130.

[0044] By offsetting at least one of the first air inlet 150 and the first air outlet 151 relative to the first air duct 130, it is possible to avoid the airflow forming a direct short circuit after entering the air duct, and the cold air being directly discharged from the air duct before it has fully exchanged heat with the battery cell, thus ensuring that the airflow flows fully inside the air duct and ensuring the heat dissipation effect. Figure 1 The illustration shows a configuration where the first air inlet 150 is directly opposite the first air duct 130, and the first air outlet 151 is staggered relative to the first air duct 130. However, this invention is not limited to this configuration; alternatively, the first air inlet 150 may be staggered, the first air outlet 151 may be directly opposite the air duct, or both the first air inlet 150 and the first air outlet 151 may be staggered relative to the first air duct 130. Figure 1 and Figure 2 In the example, a connection port is provided between the first air duct 130 and the installation area of ​​the first battery cell module 110. The airflow enters the first air duct 130 from the first air inlet 150 and flows to the end of the air duct. Then the airflow flows to the first air outlet 151 on the side through the connection port, which can extend the airflow path and enhance heat exchange.

[0045] Furthermore, the first side panel 103 is provided with a second air inlet 152, and the second side panel 104 is provided with a second air outlet 153. At least one of the second air inlet 152 and the second air outlet 153 is arranged in a staggered manner with the second air duct 140.

[0046] The arrangement of the second air inlet 152, the second air outlet 153, and the second air duct 140 can refer to the first air duct 130. For example, as shown... Figure 1 As shown, the second air inlet 152 is staggered with the second air duct 140, and the second air outlet 153 is arranged correspondingly with the second air duct 140.

[0047] According to one embodiment of this utility model, the dual-air duct battery pack further includes a protective breathable membrane disposed on the inner side of the air inlet. The protective breathable membrane is made of a microporous breathable material with pores smaller than the diameter of dust particles, which can completely block external dust, insects, and large particles of water vapor, while not obstructing airflow, ensuring that the battery pack's protection rating remains at IP20 or higher, suitable for the on-site working environment. The protective breathable membrane can have both waterproof and dustproof effects; of course, it can also have only waterproof or dustproof effects.

[0048] According to one embodiment of this utility model, the air inlet and / or air outlet includes a plurality of spaced-apart ventilation holes. The discretely distributed hole structure reduces the risk of foreign objects directly entering the housing 100 and ensures more uniform airflow during intake and exhaust, improving airflow distribution within the duct. A protective breathable membrane covers all ventilation holes of the air inlet, ensuring that each hole has dustproof and breathable capabilities.

[0049] This utility model also provides an electrical device, including the aforementioned dual-duct battery pack. This electrical device possesses all the features and beneficial effects of the aforementioned battery pack, which will not be repeated here. The electrical device can be a means of transportation, such as a vehicle; it can also be a robot, a mobile equipment for carrying people and goods, or other devices equipped with a power battery system.

[0050] The dual-airflow battery pack and power supply device provided by this utility model utilizes the gap between the first cell module and the front panel of the casing to form a first airflow channel, and utilizes the gap between the first cell module and the second cell module to form a second airflow channel, thus constructing two independent convection cooling airflow channels. The airflow enters from the air inlet and flows through the first airflow channel and the second airflow channel respectively. It can not only dissipate heat in the area of ​​the front of the casing opposite to the first cell module, but also dissipate heat in each cell of the first cell module and the second cell module. The heat dissipation coverage is large, which can reduce heat dissipation blind spots, improve the temperature uniformity of each cell, reduce the temperature difference between cells, and alleviate the risk of cell degradation caused by local overheating.

[0051] The airflow drive component is arranged between the first air duct and the second air duct and corresponds to the air outlet. It can simultaneously generate a suction effect on the two air ducts on both sides, guiding the hot air in the two air ducts to be discharged from the air outlet. This layout makes full use of the space between the first cell module and the second side plate, which is conducive to maintaining the overall compact structure of the battery pack. At the same time, it can quickly discharge hot airflow and reduce heat retention in the box.

[0052] The circuit board is located inside the first air duct. The circuit board integrates the power supply interface of the airflow drive component. On the one hand, it can provide a power connection point for the airflow drive component, realizing the power supply and control of the airflow drive component. On the other hand, the cooling airflow flowing in the first air duct can simultaneously cool the circuit board and its onboard power devices. Without adding additional heat dissipation components, it can simultaneously dissipate heat from the battery cells and circuit board components, improving the overall thermal management capability of the battery pack.

[0053] The dual-airflow battery pack of this utility model is compatible with smart lithium battery 3U specification battery packs and can achieve the following beneficial technical effects: Existing modules using natural heat dissipation methods cannot effectively dissipate heat from distant cells, resulting in temperature differences of 8-12°C across the entire cell cluster. This invention features independent dual air ducts, allowing cooling airflow to cover the entire length of the cell module. This effectively controls the overall temperature difference within 3°C, improving cell temperature uniformity and balancing the internal resistance of each string during charging and discharging. This prevents overcharging and over-discharging of localized cells, reducing the risk of thermal runaway in lithium batteries from the heat source perspective.

[0054] Traditional natural heat dissipation methods result in severe heat accumulation inside the enclosure during high-power discharge. This new design features a dual-airflow system that forms a circulating convection heat exchange loop, nearly doubling the effective heat exchange area and improving the overall heat dissipation efficiency by over 45%. Addressing the space limitations of standard rack-mount designs, it eliminates the need for additional enclosure height, enabling high-power lithium battery packs to operate at full load for extended periods within a standard 3U size, thus expanding the equipment's applicability to high and low temperature environments.

[0055] Existing air-cooled heat dissipation structures mostly operate at constant speeds, resulting in high ineffective power consumption and loud operating noise in low-temperature environments. This utility model features a dual-airflow system with temperature acquisition and BMS intelligent linkage temperature control logic, which can adjust the fan start and stop, taking into account both temperature control requirements and energy saving and noise reduction.

[0056] This utility model battery pack does not require significant changes to the overall architecture of traditional lithium batteries. It features high component interchangeability, simple assembly, fast heat dissipation response, and high temperature control accuracy. It can effectively solve the problem of high-temperature heat accumulation in smart lithium batteries while ensuring the dustproof and waterproof performance of the equipment.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A dual-airflow battery pack, characterized in that, include: Box; A first battery cell module and a second battery cell module are spaced apart inside the housing along the length of the housing. A first air duct is provided between the first battery cell module and the front panel of the housing, and a second air duct is provided between the first battery cell module and the second battery cell module. An air inlet is provided on the first side panel of the housing, and an air outlet is provided on the second side panel of the housing. The first air duct and the second air duct are both connected between the air inlet and the air outlet. An airflow drive component is disposed between the first battery cell module and the second side plate. The airflow drive component is fluidly connected to the first air duct and the second air duct respectively. The airflow drive component is disposed between the first air duct and the second air duct and is correspondingly disposed to the air outlet. A circuit board is disposed within the first air duct, and the circuit board integrates the power supply interface of the airflow drive component.

2. The dual-duct battery pack according to claim 1, characterized in that, Both the first battery cell module and the second battery cell module include multiple battery cells. The number of battery cells in the first battery cell module is less than the number of battery cells in the second battery cell module. A receiving area is formed between the first battery cell module and the second side plate for mounting the airflow drive assembly.

3. The dual-duct battery pack according to claim 2, characterized in that, The airflow drive assembly includes a first drive member and a second drive member, which are disposed separately in the receiving area. The air inlet side of the first drive member is fluidly connected to the first air duct, and the air inlet side of the second drive member is fluidly connected to the second air duct.

4. The dual-duct battery pack according to claim 1, characterized in that, Also includes: A temperature sensor is installed inside the housing. A control unit is installed on the circuit board. The temperature sensor is electrically connected to the control unit. The control unit is configured to control the start and stop of the airflow drive assembly based on the temperature data detected by the temperature sensor.

5. The dual-duct battery pack according to claim 4, characterized in that, The temperature sensor is disposed on the surface of the battery cells of the first battery cell module and the second battery cell module and / or inside the first air duct and the second air duct.

6. The dual-airflow battery pack according to claim 1, characterized in that, The first side panel is provided with a first air inlet, and the second side panel is provided with a first air outlet. At least one of the first air inlet and the first air outlet is arranged in a staggered manner from the first air duct.

7. The dual-airflow battery pack according to claim 1, characterized in that, The first side panel is provided with a second air inlet, and the second side panel is provided with a second air outlet. At least one of the second air inlet and the second air outlet is arranged in a staggered manner with the second air duct.

8. The dual-duct battery pack according to any one of claims 1 to 7, characterized in that, Also includes: A protective breathable membrane is disposed on the inside of the air inlet.

9. The dual-duct battery pack according to any one of claims 1 to 7, characterized in that, The air inlet and / or the air outlet include a plurality of ventilation holes arranged at intervals.

10. An electrical appliance, characterized in that, Includes the dual-duct battery pack according to any one of claims 1 to 9.

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