Battery pack, charging device and power consuming device

Abstract

The application relates to a battery pack, a charging device and a power utilization device. The battery pack comprises a battery box, a battery cell group and a liquid cooling plate. An air duct is formed in the battery box. A charging connector, an air inlet connector, an air outlet connector, a liquid inlet connector and a liquid outlet connector are arranged on the battery box. The air inlet connector and the air outlet connector are communicated with the air duct and can be controlled to be connected or cut off. The battery cell is located in the battery box and exchanges heat with the air duct. The charging connector is electrically connected with the battery cell. The liquid cooling plate is in heat conduction connection with the battery cell and is communicated with the liquid inlet connector and the liquid outlet connector. The technical scheme can reduce the temperature rise of the battery cell during fast charging of the battery pack, improve the fast charging performance of the battery pack and prolong the cycle service life of the battery pack.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to battery packs, charging devices, and electrical devices. Background Technology

[0002] During fast charging, the battery cells heat up too quickly. Excessive cell temperature not only limits the charging rate but also reduces the battery pack's cycle life. To reduce cell temperature rise, the mainstream solution is to increase the heat exchange area between the liquid cooling components and the cells. However, this results in a complex internal piping layout, a large number of cold plates, and occupies a significant amount of space within the battery pack, which is detrimental to improving the battery pack's energy density. Utility Model Content

[0003] Based on this, a battery pack, a charging device, and an electrical device are provided, which can improve the temperature rise of the battery pack during high-rate charging.

[0004] In a first aspect, this application proposes a battery pack, comprising:

[0005] The battery box has an internal air duct and is equipped with a charging connector, an air inlet connector, an air outlet connector, a liquid inlet connector, and a liquid outlet connector. The air inlet connector and the air outlet connector are connected to the air duct and can be controlled to open or close their own flow paths.

[0006] The battery cell is located inside the battery box and exchanges heat with the air duct; the charging connector is electrically connected to the battery cell.

[0007] The liquid cooling plate is thermally connected to the battery cell and connects the liquid inlet connector and the liquid outlet connector.

[0008] In some embodiments, a plurality of battery cells are arranged side by side along a first direction to form a battery cell group, and the multiple rows of battery cell groups are arranged at intervals along a second direction intersecting the first direction, with a first air duct formed between adjacent battery cell groups.

[0009] All the battery cell packs and the battery box are arranged on both sides of the inner wall opposite to each other along the first direction to form a second air duct, and the first air duct and the second air duct are connected.

[0010] In some embodiments, the air inlet connector and the air outlet connector are respectively arranged at both ends of the battery box in the first direction, and the two are staggered in the second direction and the third direction. The first direction, the second direction and the third direction intersect each other but are not coplanar.

[0011] In some embodiments, the battery pack further includes a duct component disposed within the battery box and forming the duct, wherein the battery cell is thermally connected to the duct component.

[0012] In some embodiments, the air inlet connector and the air outlet connector are both self-sealing connectors; and / or, the liquid cooling plate is arranged below the battery cell.

[0013] In some embodiments, both the inlet and outlet connectors can be controlled to open or close their own flow paths.

[0014] Secondly, this application proposes a charging device, comprising:

[0015] A charging adapter for connecting to the charging connector of the battery pack; and

[0016] An air supply connector and an air-cooling flow path are provided, wherein the air supply connector is connected to the air-cooling flow path and is used to connect with the air inlet connector and the air outlet connector of the battery pack.

[0017] The liquid-cooled unit includes a thermally coupled refrigerant circuit and a coolant flow path, and a liquid supply connector connected to the coolant flow path. The liquid supply connector is used to connect to the inlet and outlet connectors of the battery pack.

[0018] In some embodiments, the air-cooled flow path is thermally coupled to the refrigerant circuit.

[0019] In some embodiments, the charging device includes a dryer disposed on the air-cooled flow path; and / or, the charging device further includes an exhaust fan disposed on the air-cooled flow path.

[0020] Thirdly, this application proposes an electrical device including the battery pack described in the first aspect, the battery pack being used to provide electrical energy.

[0021] The aforementioned battery pack, charging device, and power supply device, when the charging device charges the battery pack, can provide cold air and coolant to the battery pack, combining air cooling and liquid cooling to achieve dual cooling of the battery cells inside the battery pack, significantly improving the problem of rapid temperature rise of the battery cells during fast charging, improving the fast charging performance of the battery pack, and increasing its cycle life. Attached Figure Description

[0022] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0023] Figure 1 These are schematic diagrams of the battery pack structure in some embodiments;

[0024] Figure 2 for Figure 1 A top view of the battery pack shown;

[0025] Figure 3 This is a schematic diagram illustrating the composition of a charging device according to some embodiments.

[0026] The reference numerals in the detailed embodiments are as follows:

[0027] 100. Battery pack; X, first direction; Y, second direction; Z, third direction; 110. Battery box; F, air duct; F1, first air duct; F2, second air duct; 111. Air inlet connector; 112. Air outlet connector; 113. Liquid inlet connector; 114. Liquid outlet connector; 115. Charging connector; 120. Battery cell assembly; 121. Battery cell; 130. Liquid cooling plate; 200. Charging device; 201. Charging head; 202. Air supply connection piece; 203. Air-cooled flow path; 204. Thermal coupling component; 205. Refrigerant circuit; 206. Coolant flow path; 207. Liquid supply connection piece; 208. Dryer; 209. Exhaust fan. Detailed Implementation

[0028] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0029] In the description of this application, it should be understood that, where they appear, the terms “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application 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 application.

[0030] Furthermore, where applicable, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., shall be interpreted broadly. For example, they may refer to a fixed connection, a detachable connection, or an integral part; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; they may refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0032] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] It should be noted that, if an element is described as "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is described as "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0034] To improve the temperature rise problem of battery packs during fast charging, this application first proposes a battery pack.

[0035] The battery pack in this embodiment includes battery cells. Multiple battery cells can be electrically connected in series, parallel, or a combination of both, and communicate with a battery management system via a signal acquisition component. The battery management system controls and monitors the operating status of each battery cell. Alternatively, multiple individual battery cells can first be connected to a module management system via a signal acquisition component to form a battery module. These battery modules can then be electrically connected in series, parallel, or a combination of both, and together with the battery management system, form a battery pack.

[0036] A battery cell is the smallest unit in a battery where electrochemical reactions take place; it can be a secondary or primary battery. A battery cell can be a lithium-ion, sodium-ion, or magnesium-ion battery, but is not limited to these. A battery cell can be cylindrical, flat, cuboid, or other shapes. A battery cell can be a solid-state battery.

[0037] In some embodiments, the battery cell includes a housing, an end cap, and an electrode assembly. The housing and the end cap together form an internal space for accommodating the electrode assembly. Specifically, a receiving cavity may be formed within the housing, with at least one end open. The end cap closes to the open end of the housing to seal the receiving cavity, and the electrode assembly is mounted within the receiving cavity. The housing may be, but is not limited to, a metal housing, such as an aluminum housing or a steel housing.

[0038] Electrode assemblies typically include a positive electrode, a negative electrode, and a separator separating the positive and negative electrodes. An electrolyte can be injected into the cell, wetting the interior of the electrode assembly and providing ion migration pathways for electrochemical reactions, as well as conducting electricity. Electrode assemblies can be in the form of wound, stacked, etc. One or more electrode assemblies can be installed within the cell.

[0039] The battery pack 100 in the embodiments of this application is described in detail below.

[0040] Figure 1 This is a schematic diagram of the structure of a battery pack 100 according to some embodiments. Figure 2 for Figure 1 The diagram shows a top view of the battery pack 100.

[0041] Please refer to Figure 1 and Figure 2 The battery pack 100 proposed in this application includes a battery box 110, a cell assembly 120, and a liquid cooling plate 130. An air duct F is formed inside the battery box 110. The battery box 110 is equipped with a charging connector 115, an air inlet connector 111, an air outlet connector 112, a liquid inlet connector 113, and a liquid outlet connector 114. Both the air inlet connector 111 and the air outlet connector 112 are connected to the air duct F and can be controlled to open or close their flow paths. The cell 121 is located inside the battery box 110 and exchanges heat with the air duct F. The charging connector 115 is electrically connected to the cell 121. The liquid cooling plate 130 is thermally connected to the cell 121 and connects to the liquid inlet connector 113 and the liquid outlet connector 114.

[0042] The charging connector 115 is used to connect with an external charging head 201 or other charging devices to charge the battery pack 100. The air inlet connector 111 and air outlet connector 112 are used to connect to an external air supply device. Cool air supplied by the air supply device enters the battery box 110 through the air inlet connector 111, absorbs heat from the battery cells 121, and then flows out of the battery box 110 through the air outlet connector 112. The liquid cooling plate 130 is used to circulate the cooling medium and is directly or indirectly thermally connected to the battery cells 121, allowing the battery pack 100 to remove heat from the battery cells 121 during charging.

[0043] The air inlet connector 111 and the air outlet connector 112 can be controlled to open or switch their own flow paths. In practical applications, the battery pack 100 has a charging state and a non-charging state. When the battery pack 100 is in a non-charging state, the air inlet connector 111 and the air outlet connector 112 are in a state of cutting off their own flow paths, and cold air cannot enter or exit the air duct F through the air inlet connector 111 and the air outlet connector 112. When the battery pack 100 is in a charging state, the air inlet connector 111 and the air outlet connector 112 can be automatically switched or controlled to switch to a state of opening their own flow paths, and cold air can enter the air duct F through the air inlet connector 111 and exit the air duct F through the air outlet connector 112.

[0044] When the battery pack 100 is not charging, the heat generated by the battery cell 121 is minimal. The air inlet connector 111 and air outlet connector 112 are in a state where their own flow paths are cut off. The battery pack 100 can utilize the liquid cooling plate 130 to exchange heat with the battery cell 121, regulating its operating temperature. When the battery pack 100 is charging, the heat generated by the battery cell 121 is significant. The air inlet connector 111 and air outlet connector 112 switch to a state where their own flow paths are open and connect to an external air supply device. The cold air supplied by the air supply device enters the air duct F inside the battery box 110 through the air inlet connector 111, carrying away the heat from the battery cell 121 before being discharged through the air outlet connector 112. Simultaneously, the liquid cooling plate 130 continues to exchange heat with the battery cell 121. Thus, during charging, the battery pack 100 can combine air cooling and liquid cooling for dual cooling of the battery cell 121, significantly improving the temperature rise of the battery cell 121, enhancing the fast-charging performance of the battery pack 100, and increasing its cycle life.

[0045] In one embodiment, reference is made to Figure 2 Multiple battery cells 121 are arranged side-by-side along a first direction X to form a battery cell group 120. Multiple rows of battery cell groups 120 are arranged at intervals along a second direction Y intersecting the first direction X, with a first air duct F1 formed between adjacent battery cell groups 120. All battery cell groups 120 and the battery box 110 have second air ducts F2 formed at intervals on their opposite inner walls along the first direction X, and the first air duct F1 and the second air duct F2 are connected.

[0046] In one application scenario, the battery box 110 is a hexahedron, with the first direction X, the second direction Y, and the third direction Z corresponding to the length, width, and height directions of the battery box 110, respectively. If the battery cell 121 is a prismatic cell 121, its thickness direction corresponds to the first direction X.

[0047] Multiple battery cells 121 are arranged side-by-side along a first direction X to form a battery cell group 120. Adjacent battery cell groups 120 are spaced apart along a second direction Y to form a first air duct F1. In one embodiment, the battery cell groups 120 at both ends of the second direction Y are adjacent to the inner wall of the battery box 110. In another embodiment, the battery cell groups 120 at both ends of the second direction Y are spaced apart from the inner wall of the battery box 110 to form a first air duct F1, thereby increasing the heat exchange area between the end battery cell groups 120 and the cold air. It is worth noting that the number of first air ducts F1 can be one or at least two, depending on the number of rows of battery cell groups 120. Understandably, the first air duct F1 extends along the first direction X.

[0048] The second air duct F2 is formed by the inner walls of both sides of the entire cell assembly 120 and the battery box 110 in the first direction X. The second air duct F2 is formed on both sides of the cell assembly 120 in the first direction X. The second air duct F2 on one side connects to the entire first air duct F1 and the air inlet connector 111, and the second air duct F2 on the other side connects to the entire first air duct F1 and the air outlet connector 112.

[0049] When cold air enters the battery box 110 through the air inlet 111, it is diverted to the various first air ducts F1 via the second air duct F2 on one side, exchanging heat synchronously with each row of battery cells 120, resulting in high heat exchange efficiency. Then, it converges through another second air duct F2 and flows to the air outlet 112 until it is discharged from the battery box 110. At this point, the battery cells 120 directly form the first air duct F1, allowing the cold air to directly contact the battery cells 120, further improving heat exchange efficiency.

[0050] In a further embodiment, the air inlet connector 111 and the air outlet connector 112 are respectively arranged at both ends of the battery box 110 in the first direction X, and the two are staggered in the second direction Y and the third direction Z. The first direction X, the second direction Y and the third direction Z intersect each other but are not coplanar.

[0051] That is, the air inlet connector 111 and the air outlet connector 112 are staggered in the length, width and height directions of the battery box 110, and are distributed diagonally. In this way, the gas flow path between the air inlet connector 111 and the air outlet connector 112 is longer, the cold air has more sufficient contact with the battery cell assembly 120, and the heat exchange efficiency is higher.

[0052] Preferably, the air inlet connector 111 is arranged above the air outlet connector 112. Utilizing the principle of downward flow of cold air, when the cold air flows in the air duct F, it makes more thorough contact with the battery cell 121 in the third direction Z, which helps to improve the cooling effect of the battery cell 121.

[0053] In another embodiment, the battery pack 100 includes a duct component (not shown), which is disposed within the battery case 110 and forms the aforementioned air duct F. The battery cell 121 is thermally connected to the duct component. The duct component can be a metal pipe with a cross-sectional shape such as a square, a sun-shaped, or an eye-shaped structure. The duct component has high thermal conductivity and is used to efficiently conduct heat between the battery cell 121 and the cold air when cold air is circulated. Specific structural forms of the duct component are not exhaustively described here; those skilled in the art can perform conventional designs.

[0054] In some embodiments, both the air inlet connector 111 and the air outlet connector 112 are self-sealing connectors. A self-sealing connector is a connector structure capable of achieving self-sealing. When not connected to an external connector, the self-sealing connector is in a self-sealing state, cutting off its own flow path. When connected to an external connector, the self-sealing connector can switch to a conducting state under the action of the external connector, that is, opening its own flow path. For example, the self-sealing connector adopts a sealing valve core structure with a guide post and a pre-compression spring. In the cut-off state, the spring pressure causes the valve core to form a surface seal with the valve seat, achieving bidirectional fluid isolation. When connected to an external connector, the external connector pushes the valve core backward to open the flow channel. The self-sealing connector is a commonly used connector structure in the art, and its specific type is not limited here.

[0055] In practical applications, when the air inlet connector 111 and air outlet connector 112 are self-sealing connectors, and the battery pack 100 is in a non-charging state, the air inlet connector 111 and air outlet connector 112 are in a self-sealing state, cutting off their own flow path. When the battery pack 100 is in a charging state, after the air inlet connector 111 and air outlet connector 112 are plugged into the pipe connector of the air supply device, they switch to a state of conducting their own flow path under the action of the pipe connector, connecting the air supply device with the internal air duct F of the battery box 110 to form a gas circuit.

[0056] It should be noted that the air supply device can be a device that supplies cryogenic gases such as cryogenic air, cryogenic nitrogen, and cryogenic argon to the battery box 110, and its specific type is not limited.

[0057] The air inlet connector 111 and air outlet connector 112 are not limited to the above-described designs. In one embodiment, the air inlet connector 111 and air outlet connector 112 are composed of connector pipes and shut-off valves installed on the connector pipes. The state of the air inlet connector 111 and air outlet connector 112 is switched by operating the shut-off valves.

[0058] In some embodiments, refer to Figure 2 The liquid cooling plate 130 is arranged below the battery cell 121. Specifically, the battery cell assembly 120 is supported on the liquid cooling plate 130, and has a large contact area with the liquid cooling plate 130. The liquid cooling plate 130 provides high cooling efficiency for the battery cell assembly 120 and simplifies the piping layout. Of course, in other embodiments, the liquid cooling plate 130 can also be arranged above or to the side of the battery cell 121.

[0059] In some embodiments, both the inlet connector 113 and the outlet connector 114 can be controlled to open or close their own flow paths. In practical applications, the battery pack 100 is used to provide power to electrical devices. These devices are typically equipped with liquid cooling units that provide coolant to the liquid cooling plate 130; that is, the liquid cooling units are connected to the inlet connector 113 and the outlet connector 114 of the battery pack 100. In some cases, when the battery pack 100 has insufficient power, it needs to be detached from the electrical device and transported to a battery swapping station for charging. During this process, the inlet connector 113 and the outlet connector 114 of the battery pack 100 need to be disconnected from the liquid cooling unit on the electrical device. Switching the inlet connector 113 and the outlet connector 114 to their respective flow path switching states can prevent the coolant inside the battery pack 100 from leaking through the inlet connector 113 and the outlet connector 114 during transport. When the battery pack 100 is transported to the battery swapping station, the charging device 200 of the battery swapping station provides coolant to the battery pack 100 so that air cooling and liquid cooling are combined to cool the battery cell 121 when the battery pack 100 is charging.

[0060] The inlet connector 113 and outlet connector 114 can be self-sealing connectors or shut-off valves installed on the connector pipelines; the specific type is not limited.

[0061] Figure 3 This is a schematic diagram of the composition of a charging device 200 according to some embodiments.

[0062] Additionally, this application embodiment also provides a charging device 200, see reference to Figure 3 The charging device 200 includes a charging head 201, an air supply connector 202, an air-cooled flow path 203, and a liquid-cooled unit. The charging head 201 is used to connect with the charging connector 115 of the battery pack 100. The air supply connector 202 is connected to the air-cooled flow path 203 and is used to connect with the air inlet connector 111 and the air outlet connector 112 of the battery pack 100. The liquid-cooled unit includes a thermally coupled refrigerant circuit 205 and a coolant flow path 206, and a liquid supply connector 207 connected to the coolant flow path 206. The liquid supply connector 207 is used to connect with the liquid inlet connector 113 and the liquid outlet connector 114 of the battery pack 100.

[0063] Liquid-cooled units are commonly used in this field, and their specific construction is not limited here. Typically, a liquid-cooled system includes a compressor, condenser, expansion valve, and evaporator located in the refrigerant circuit 205. The refrigerant flowing through the refrigerant circuit 205 can be of types such as R32 or R290. After being discharged from the compressor, the high-temperature refrigerant is cooled by the condenser and then by the expansion valve. At the evaporator, it absorbs heat from the coolant flow path 206, cooling the coolant in the flow path 206, and finally returns to the compressor, returning to a high-temperature state. The evaporator, as a thermal coupling element 204, thermally couples the coolant flow path 206 and the refrigerant circuit 205.

[0064] Two liquid supply connectors 207 are usually configured, one for connecting the liquid inlet connector 113 and the other for connecting the liquid outlet connector 114. The liquid cooling plate 130 is connected to the coolant flow path 206 through the liquid inlet connector 113 and the liquid outlet connector 114. When the coolant flows through the liquid cooling plate 130, it carries away the heat of the battery cell 121.

[0065] The air-cooled flow path 203 is used to provide low-temperature gas. An air supply device can be independently configured within the charging device 200. The air supply device has the aforementioned air-cooled flow path 203 and air supply connector 202. The air supply device is connected to the air inlet connector 111 and the air outlet connector 112 via the air supply connector 202 to provide cool air to the air duct F inside the battery box 110 to remove heat from the battery cell 121.

[0066] Understandably, when the air supply connector 202 and the liquid supply connector 207 are not connected to their respective connectors, they maintain a sealed state to prevent air and liquid leakage. When the air supply connector 202 and the liquid supply connector 207 are connected to their respective connectors, they can switch to a conductive state to allow cold air and coolant to flow to the connected connector. In one embodiment, both the air supply connector 202 and the liquid supply connector 207 include a connector pipe and a shut-off valve. The shut-off valve is located on the connector pipe and can control the opening and closing of the connector pipe. In another embodiment, the air supply connector 202 and the liquid supply connector 207 are self-sealing connectors that match their respective connectors. In the embodiments of this application, the specific construction of the air supply connector 202 and the liquid supply connector 207 is not limited. Generally, it is sufficient that they maintain a seal without leakage when not connected to an external connector, and maintain conductivity for liquid / air flow when connected to an external connector.

[0067] The aforementioned charging device 200 can not only charge the battery pack 100 using its charging head 201, but also supply cool air to the battery pack 100 using its air-cooling flow path 203 and coolant to the battery pack 100 using its coolant flow path 206. Thus, during fast charging of the battery pack 100, the air-cooling flow path 203 and coolant flow path 206 on the charging device 200 supply air and coolant respectively, achieving a combination of air cooling and liquid cooling to effectively cool the battery cell 121. This significantly reduces the problem of excessively rapid temperature rise of the battery cell 121 during charging, improving the charging and discharging efficiency and cycle life of the battery pack 100.

[0068] It should be noted that the coolant flow path 206 and the air-cooling flow path 203 are also typically used to dissipate heat and cool down the internal piping and heat-generating components of the charging device 200, preventing the charging device 200 from overheating during charging. Thus, the coolant flow path 206 and the air-cooling flow path 203 have high utilization rates.

[0069] In a specific embodiment, the air-cooled flow path 203 is thermally coupled to the refrigerant circuit 205. Specifically, the refrigerant circuit 205 and the air-cooled flow path 203 are thermally coupled through a thermal coupling element 204 (such as a heat exchanger). In this way, the cooling capacity of the refrigerant circuit 205 can be fully utilized to produce cryogenic gas, eliminating the need for a separate air supply device, reducing the cost of the charging device 200, improving the cooling capacity utilization rate of the liquid-cooled unit, and the cryogenic gas provides a more significant cooling effect on the battery pack 100.

[0070] In some embodiments, the charging device 200 includes a dryer 208 disposed on the air-cooled flow path 203. The dryer 208 is typically disposed on the side of the liquid inlet connector 113 to dry the gas entering the battery box 110 and prevent condensation from occurring inside the battery box 110.

[0071] In some embodiments, the charging device 200 includes an exhaust fan 209 disposed on the air-cooled flow path 203. The exhaust fan 209 can accelerate the flow rate of gas on the air-cooled flow path 203, improve the heat exchange efficiency between the cold air and the battery cell 121, and cool the battery cell 121 faster.

[0072] It is worth noting that the air-cooled flow path 203 can be a closed loop or a non-closed loop. When the air-cooled flow path 203 is a non-closed loop, the gas flowing inside it can be air. In one embodiment, the gas inside the air-cooled flow path 203 is obtained by the exhaust fan 209 drawing air from outside the charging device 200.

[0073] In addition, this application embodiment also provides an electrical device, including the aforementioned battery pack 100, which is used to provide electrical energy. This electrical device can be, but is not limited to, electric vehicles, ships, airplanes, etc. Taking a vehicle as an example, the battery can be located at the rear, front, or bottom of the vehicle. The battery can provide electrical energy for the vehicle's drive and also for the vehicle's control system. A liquid cooling unit is configured on the electrical device, connected to the liquid inlet connector 113 and liquid outlet connector 114 of the battery pack 100. When the battery pack 100 is not charging, the electrical device provides coolant to regulate the operating temperature of the battery cells 121 during use.

[0074] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery pack (100), characterized by, include: A battery box (110) has an air duct (F) inside, and a charging connector (115), an air inlet connector (111), an air outlet connector (112), a liquid inlet connector (113), and a liquid outlet connector (114) are provided on it; the air inlet connector (111) and the air outlet connector (112) are both connected to the air duct (F) and can be controlled to open or close their own flow paths; The battery cell (121) is located inside the battery box (110) and exchanges heat with the air duct (F). The charging connector (115) is electrically connected to the battery cell (121). The liquid cooling plate (130) is thermally connected to the battery cell (121) and connects the liquid inlet connector (113) and the liquid outlet connector (114).

2. The battery pack (100) according to claim 1, characterized in that, Multiple battery cells (121) are arranged side by side along a first direction (X) to form a battery cell group (120). Multiple rows of battery cell groups (120) are arranged at intervals along a second direction (Y) intersecting the first direction (X). A first air duct (F1) is formed between adjacent battery cell groups (120). All the battery cell packs (120) and the battery box (110) are arranged opposite each other along the first direction (X) and the inner walls of both sides are spaced to form a second air duct (F2), and the first air duct (F1) and the second air duct (F2) are connected.

3. The battery pack (100) according to claim 2, characterized in that, The air inlet connector (111) and the air outlet connector (112) are respectively arranged at both ends of the battery box (110) in the first direction (X), and the two are staggered in the second direction (Y) and the third direction (Z). The first direction (X), the second direction (Y) and the third direction (Z) intersect each other but are not coplanar.

4. The battery pack (100) of claim 1, wherein, The battery pack (100) also includes a duct component, which is disposed inside the battery box (110) and forms the duct (F). The battery cell (121) is thermally connected to the duct component.

5. The battery pack (100) of claim 1, wherein, Both the air inlet connector (111) and the air outlet connector (112) are self-sealing connectors; and / or, the liquid cooling plate (130) is arranged below the battery cell (121).

6. The battery pack (100) of claim 1, wherein, Both the liquid inlet connector (113) and the liquid outlet connector (114) can be controlled to open or close their own flow paths.

7. A charging device (200), characterized in that, include: A charging head (201) is used to mate with the charging connector (115) of the battery pack (100); and An air supply connector (202) and an air-cooled flow path (203) are provided, wherein the air supply connector (202) is connected to the air-cooled flow path (203) and is used to connect with the air inlet connector (111) and the air outlet connector (112) of the battery pack (100); The liquid-cooled unit includes a thermally coupled refrigerant circuit (205) and a coolant flow path (206), and a liquid supply connector (207) connected to the coolant flow path (206), the liquid supply connector (207) being used to connect to the inlet connector (113) and outlet connector (114) of the battery pack (100).

8. The charging device (200) according to claim 7, characterized in that The air-cooled flow path (203) is thermally coupled to the refrigerant circuit (205).

9. The charging device (200) according to claim 7, characterized in that, The charging device (200) includes a dryer (208) disposed on the air-cooled flow path (203); and / or, The charging device (200) also includes an exhaust fan (209), which is located in the air-cooled flow path (203).

10. An electrical device, characterized by Includes a battery pack (100) as described in any one of claims 1 to 6, the battery pack (100) being used to provide electrical energy.

Images