Battery pack and electric device

Abstract

The application relates to the technical field of battery packs, in particular to a battery pack and an electric equipment. The battery pack comprises a box body; a plurality of battery cells arranged in the accommodating cavity of the box body, the plurality of battery cells are arranged into a first battery cell column and a second battery cell column along a first direction; the first battery cell column is arranged into two columns along a second direction, and the second battery cell column is arranged between the two columns of the first battery cell column; and a heat exchange structure, the heat exchange structure comprises an evaporation part and a condensation part, and the evaporation part and the condensation part both have flow channels for circulating a heat exchange medium. The evaporation part is adjacent to the second battery cell column, the condensation part is in contact with the box body, the heat exchange medium evaporates and absorbs heat when flowing through the evaporation part, and the heat exchange medium condenses and releases heat when flowing through the condensation part. In this way, the heat dissipation effect of the second battery cell column can be improved, the heat dissipation effects of the second battery cell column and the first battery cell column tend to be consistent, the temperatures of the first battery cell column and the second battery cell column tend to be consistent, and the use performance and the service life of the battery pack can be ensured.

Description

Technical Field

[0001] This application relates to the field of battery pack technology, and more particularly to a battery pack and electrical equipment. Background Technology

[0002] Battery packs in electric bicycles, scooters, and motorcycles typically consist of a housing and multiple battery cells housed within it. During operation, the battery cells exchange heat with the air or structural components within the pack, transferring the heat generated by the cells to the housing. The housing then exchanges heat with the external environment to achieve overall heat dissipation for the battery pack.

[0003] Under this heat dissipation method, the cells closer to the casing usually dissipate heat better than other cells, which results in a large temperature difference between the cells, thus adversely affecting the performance and lifespan of the battery pack. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a battery pack and an electrical device.

[0005] In a first aspect, embodiments of this application provide a battery pack. The battery pack described in this application embodiment has a first direction and a second direction, the first direction intersecting the second direction, and includes:

[0006] The housing includes a receiving cavity;

[0007] A battery cell is disposed within the receiving cavity. Multiple battery cells are disposed therein, and the multiple battery cells are arranged along the first direction to form a first battery cell column and a second battery cell column. The first battery cell column is disposed in two columns spaced apart along the second direction, and the second battery cell column is disposed between the two columns of the first battery cell column.

[0008] The heat exchange structure has an evaporation section and a condensation section, both of which have flow channels for the flow of heat exchange medium, and the flow channels in the evaporation section are connected to the flow channels in the condensation section; the evaporation section is adjacent to the second battery cell array, and the condensation section is in contact with the housing; the heat exchange medium absorbs heat when it flows through the evaporation section, and releases heat when it flows through the condensation section.

[0009] Optionally, the battery pack includes a thermal pad;

[0010] The thermal pad is disposed on the side of the evaporation section facing the second battery cell array; one side of the thermal pad is in contact with the evaporation section, and the other side of the thermal pad is in contact with the second battery cell array.

[0011] Optionally, the second battery cell column is provided with at least two columns, the evaporation section is provided between two adjacent columns of the second battery cell column, and the thermal pads are provided on both sides of the evaporation section.

[0012] Optionally, the second battery cell column is provided with an even number of columns, and the heat exchange structure is provided with at least two columns. Two columns of the second battery cell are provided between any two adjacent evaporation sections, and any second battery cell column is adjacent to and exchanges heat with only one evaporation section.

[0013] Optionally, the battery cell is a cylindrical battery cell, and the evaporation section includes a first arc-shaped section and a second arc-shaped section, wherein multiple first arc-shaped sections and second arc-shaped sections are provided and are alternately arranged along the first direction;

[0014] The thermal pad at any of the first arcuate portions is bonded to one of the cells in one of the adjacent columns of the second cell array, and the thermal pad at any of the second arcuate portions is bonded to one of the cells in another adjacent column of the second cell array.

[0015] Optionally, the thermal pad is a phase change material thermal pad.

[0016] Optionally, the first direction is in the same direction as the direction of gravity, and the condensation section is located above the evaporation section.

[0017] Optionally, the battery pack includes a bracket;

[0018] The bracket is disposed within the receiving cavity, and the bracket has a mounting cavity and a vent. The battery cell is disposed within the mounting cavity and fixedly connected to the bracket. The vent communicates with the mounting cavity.

[0019] Optionally, the outer surface of the housing has protrusions, and multiple protrusions are spaced apart.

[0020] Secondly, this application also provides an electrical device, which includes a battery pack as described above.

[0021] In some implementations of this application, the battery pack includes a housing, battery cells installed inside the housing, and a heat exchange structure. Multiple battery cells are arranged along a first direction to form a first cell column and a second cell column, with the second cell column positioned between two first cell columns. The heat exchange structure has an evaporation section and a condensation section, both having flow channels for the flow of a heat exchange medium. The evaporation section is adjacent to the second cell column, and the condensation section is in contact with the housing. When the heat exchange medium flows through the evaporation section, it evaporates and absorbs heat dissipated by the second cell column. When the heat exchange medium flows to the condensation section, it exchanges heat with the housing, releasing heat through condensation. This released heat can be dissipated to the outside through the housing. Under the action of the heat exchange structure, the heat from the second cell column can be continuously transferred to the housing and then to the external environment. This improves the heat dissipation effect of the second cell column, making its heat dissipation effect more consistent with that of the first cell column, thereby ensuring that the temperatures of the first and second cell columns tend to be consistent. This avoids large temperature differences between battery cells, which helps ensure the performance and lifespan of the battery pack.

[0022] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0023] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0024] Figure 1 This is an isometric view of the battery pack described in this application;

[0025] Figure 2 yes Figure 1 A schematic diagram of the support frame, battery cell, and heat exchange structure;

[0026] Figure 3 yes Figure 2 Schematic diagram of the heat exchange structure and battery cell arrangement;

[0027] Figure 4 yes Figure 2 Axonometric view of the heat exchange structure and thermal pad in the middle;

[0028] Figure 5 yes Figure 2 Axonometric view of the middle section of the support structure;

[0029] Reference numerals: 1. Housing; 11. Receiving cavity; 12. Protrusion; 2. Battery cell; 2a. First battery cell row; 2b. Second battery cell row; 3. Heat exchange structure; 31. Evaporation section; 311. First arc-shaped section; 312. Second arc-shaped section; 32. Condensation section; 4. Thermal pad; 5. Bracket; 51. Mounting cavity; 52. Vent; 53. Mounting hole; 54. Protruding edge; 6. Busbar; X - First direction; Y - Second direction. Detailed Implementation

[0030] The embodiments of this utility model will now be described in detail. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0031] Battery packs generate significant heat during operation. Under conditions of high temperature, overcharging, over-discharging, or internal short circuits, existing battery packs can experience uncontrolled internal chemical reactions, producing substantial heat and flammable gases. This can cause a rapid rise in battery pack temperature, potentially leading to fire or even explosion. Furthermore, sustained high temperatures accelerate the decomposition of internal battery materials and electrolytes, increasing the risk of short circuits, lithium plating, and other malfunctions, ultimately causing premature battery failure. Therefore, the heat dissipation capacity of a battery pack directly impacts its safety, performance, lifespan, and reliability, and ultimately, the reliability of the entire electrical device.

[0032] Battery packs in electric bicycles, scooters, and motorcycles typically employ passive cooling thermal management measures. During operation, the battery cells exchange heat with the air or structural components within the pack, transferring the heat generated by the cells to the pack's casing. The battery pack's casing then exchanges heat with the external environment to achieve overall heat dissipation.

[0033] However, these types of battery packs typically contain multiple cells. The cells on the outer edges are closer to the casing and can exchange heat more easily, resulting in better heat dissipation. Cells on the inner edges, being farther from the casing, are also affected by the heat from surrounding cells, leading to poorer heat dissipation. This results in poor temperature uniformity of the battery pack. In actual use, cells with poor heat dissipation will have significantly higher temperatures than other cells. If a single cell experiences thermal runaway, the high temperature and ejected debris will quickly spread to neighboring cells, potentially causing the entire battery pack to catch fire and explode. Furthermore, cells with poor heat dissipation, operating at high temperatures for extended periods, will experience much faster capacity decay and internal resistance increase than cells with good heat dissipation. Since the usable capacity, power output, and lifespan of a battery pack are determined by its worst-performing cell, even if most cells are in good condition, a few rapidly aging cells will force the entire battery pack to reach its end-of-life prematurely. This significantly reduces the overall lifespan of the battery pack and the range of electrical equipment. Therefore, poor temperature uniformity of the battery pack will directly affect its performance and lifespan, and in turn affect the performance of the electrical equipment.

[0034] To address the aforementioned issues, embodiments of this application provide a battery pack and an electrical device.

[0035] Firstly, embodiments of this application provide a battery pack. (See reference...) Figure 1 The battery pack described in this application embodiment has a first direction X and a second direction Y, which intersect. Specifically, the first direction X and the second direction Y can be in a general intersecting relationship, that is, the included angle between the first direction X and the second direction Y is an acute angle or an obtuse angle. Preferably, the first direction X and the second direction Y are orthogonal.

[0036] The battery pack described in this application embodiment includes, as follows: Figure 1 Box 1 shown Figure 2 The battery cell 2 and heat exchange structure 3 are shown. (Reference) Figure 1 The housing 1 is the outer shell of the battery pack and provides a mounting base for the battery cells 2. The housing 1 has a receiving cavity 11, in which the battery cells 2 and the heat exchange structure 3 are installed. In the embodiments described in this application, the specific shape of the housing 1 can be determined according to actual needs. For example, the housing 1 can be a cubic housing 1, in which case the housing 1 is surrounded by a top cover, a bottom plate, and four side walls; or, for another example, the housing 1 can be a hexagonal prism housing 1, in which case the housing 1 is surrounded by a top cover, a bottom plate, and six side walls. The receiving cavity 11 of the housing 1 is the cavity formed by the top cover, the bottom plate, and the side walls.

[0037] refer to Figure 3The battery cell 2 is the main component in the battery pack that stores electrical energy. Typically, multiple battery cells 2 are used, specifically three, four, ten, twenty, or even more. The specific number of battery cells 2 can be determined according to actual needs, and will not be elaborated here. Multiple battery cells 2 are arranged into a first battery cell column 2a and a second battery cell column 2b. The arrangement direction of the battery cells 2 in both the first battery cell column 2a and the second battery cell column 2b is the same as the first direction X. In other words, the first direction X is the arrangement direction of the battery cells 2 in the first battery cell column 2a and the second battery cell column 2b. Two columns of the first battery cell column 2a are spaced apart along the second direction Y, and the second battery cell column 2b is located between the two columns of the first battery cell column 2a. When the battery cells 2 are installed in the receiving cavity 11, along the second direction Y, the first battery cell column 2a is adjacent to the housing 1, and the second battery cell column 2b is located between the two second battery cell columns 2b.

[0038] refer to Figure 3 The heat exchange structure 3 has an evaporation section 31 and a condensation section 32. The evaporation section 31 is adjacent to the second battery cell array 2b, while the condensation section is in contact with the housing 1. Both the evaporation section 31 and the condensation section 32 have flow channels for the flow of the heat exchange medium. The flow channels in the evaporation section 31 and the condensation section 32 are connected, allowing the heat exchange medium to flow from the evaporation section 31 to the condensation section 32 and vice versa. The heat exchange medium can be water, Freon, etc. When the heat exchange medium flows through the evaporation section 31, it evaporates and absorbs surrounding heat under the heat of the second battery cell array 2b, lowering the temperature of the second battery cell array 2b. When the evaporated heat exchange medium flows into the condensation section 32 along the flow channels, its temperature decreases and it condenses, transferring the heat of the heat exchange medium to the housing 1. The housing 1 exchanges heat with the external environment, allowing the heat of the second battery cell array 2b to be dissipated into the external environment. In the embodiment described in this application, the heat exchange structure 3 is specifically a heat spreader. The heat exchange plate can be either a copper heat exchange plate or an aluminum heat exchange plate. Preferably, the heat exchange structure 3 uses an aluminum heat exchange plate to reduce the cost of the heat exchange structure 3 while ensuring its heat exchange capacity. In addition, aluminum has better ductility, so using aluminum to make the heat exchange structure 3 facilitates its processing and shaping, allowing the shape of the evaporation section 31 to fit the second battery cell array 2b more closely, thereby improving the heat exchange efficiency and capacity between the evaporation section 31 and the second battery cell array 2b.

[0039] Since the second cell column 2b is located between the two columns of the first cell column 2a, under the original passive heat dissipation method, the heat dissipation capacity of the first cell column 2a is stronger than that of the second cell column 2b. The heat exchange structure 3 can transfer the heat from the second cell column 2b to the housing 1 through the flow of the heat exchange medium, allowing the heat from the second cell column 2b to be transferred to the external environment via the housing 1. This improves the heat dissipation effect of the second cell column 2b, helping to make the heat dissipation effect of the second cell column 2b and the first cell column 2a more consistent, thus ensuring that the temperatures of the first cell column 2a and the second cell column 2b tend to be consistent. This avoids a large temperature difference between the cells 2, thus helping to ensure the performance and lifespan of the battery pack.

[0040] refer to Figure 4 In some embodiments of this application, the battery pack may optionally include a thermal pad 4. The thermal pad 4 is disposed on the side of the evaporator 31 facing the second cell array 2b, with both sides of the thermal pad 4 in contact with the evaporator 31 and the second cell array 2b, respectively, so that the heat generated by the second cell array 2b can be directly transferred to the evaporator 31 via the thermal pad 4. Compared to heat conduction between the second cell array 2b and the evaporator 31 via air, this improves the heat transfer efficiency between the second cell array 2b and the evaporator 31, and facilitates the timely removal of heat generated by the second cell array 2b by the heat exchange structure 3, thus improving the heat dissipation effect of the second cell array 2b. In the embodiments described in this application, the thermal pad 4 can specifically be a rigid thermal pad such as a copper thermal pad or a ceramic pad, or a flexible thermal pad such as a silicone grease pad. When a flexible thermal pad is used for the thermal pad 4, the thermal pad 4 can ensure good contact with the second battery cell array 2b and the evaporation section 31, minimize the air gap between the thermal pad 4 and the second battery cell array 2b and the evaporation section 31, and further improve the heat transfer efficiency between the second battery cell array 2b and the evaporation section 31.

[0041] refer to Figure 3In some embodiments of this application, optionally, at least two rows of second cell columns 2b are provided. The specific number of second cell columns 2b can be two, three, four, five, or even more. The number of second cell columns 2b can be determined according to actual needs, and will not be listed in detail here. The evaporation section 31 is disposed between two adjacent rows of second cell columns 2b, and heat-conducting pads 4 are provided on both sides of the evaporation section 31. At this time, the two adjacent rows of second cell columns 2b can transfer heat to the housing 1 through the same heat exchange structure 3. Compared with the scheme where each row of second cell columns 2b exchanges heat with the housing 1 through a separate heat exchange structure 3, this simplifies the internal structure of the battery pack and helps to save the overall space occupied by the heat exchange structure 3 in the housing 1. Without changing the volume of the internal cavity 11 of the housing 1, this allows the housing 1 to have more space to arrange the cells 2, thus helping to improve the volumetric energy density of the battery pack. Of course, in other embodiments, the same number of second cell rows 2b and heat exchange structures 3 can be provided in the battery pack, with each second cell row 2b contacting the evaporation section 31 of a heat exchange structure 3.

[0042] In the embodiments described in this application, the number and location of the heat exchange structures 3 can be flexibly configured. Specifically, in this embodiment, the second cell column 2b can be configured in two columns, with an evaporation section 31 disposed between the two columns. A heat-conducting pad 4 is disposed on each side of the evaporation section 31 so that the heat generated by the two columns of second cell columns 2b can be transferred to the evaporation section 31 through the heat-conducting pad 4. The second cell column 2b can also be configured in three columns, in which case two heat exchange structures 3 can be disposed in the battery pack, with an evaporation section 31 disposed between any two adjacent columns of second cell columns 2b, and a heat-conducting pad 4 disposed on each side of each evaporation section 31. When the second cell column 2b is configured in three columns, one heat exchange structure 3 can also be disposed in the battery pack. The evaporation section 31 is disposed between two adjacent columns of second cell columns 2b, and a heat-conducting pad 4 is disposed on each side of the evaporation section 31.

[0043] refer to Figure 3 In some embodiments of this application, optionally, the second battery cell array 2b is provided with an even number of arrays. Correspondingly, the heat exchange structure 3 is provided with at least two arrays, and two arrays of second battery cell arrays 2b are provided between any two adjacent evaporation sections 31, so that any second battery cell array 2b is adjacent to and exchanges heat with only one evaporation section 31. For example, four arrays of second battery cell arrays 2b can be provided. In this case, two heat exchange structures 3 can be provided, with two arrays of second battery cell arrays 2b spaced between two evaporation sections 31, and two evaporation sections 31 located between the remaining two arrays of second battery cell arrays 2b. In this arrangement, any evaporation section 31 can exchange heat with the second battery cell arrays 2b on both sides, while any second battery cell array 2b can only exchange heat with one evaporation section 31.

[0044] When the number of second cell columns 2b is odd, if an evaporator 31 is provided between every two adjacent second cell columns 2b, and each evaporator 31 can exchange heat with the two adjacent second cell columns 2b, then the non-side second cell columns 2b can exchange heat with two evaporators 31. However, the outermost second cell column 2b can only exchange heat with one evaporator 31. This means that the heat dissipation effect of the outermost second cell column 2b is different from that of the non-side second cell columns 2b. This can easily lead to a temperature difference between the outermost and non-side second cell columns 2b, thus affecting the uniform temperature performance of the battery pack. In the embodiment described in this application, since the number of second cell columns 2b is even, and two columns of second cell columns 2b are provided between any two adjacent evaporators 31, any second cell column 2b can only be adjacent to and exchange heat with one evaporator 31. This ensures that each column of second cells 2b has the same heat dissipation effect, which helps to make the temperature of the outermost column of second cells 2b and the non-edge columns of second cells 2b tend to be consistent. This avoids large temperature differences between cells 2, thus helping to ensure the performance and lifespan of the battery pack.

[0045] refer to Figure 3 In some embodiments of this application, optionally, the battery cell 2 is a cylindrical battery cell. For two adjacent rows of battery cells 2, the battery cells 2 are staggered in the first direction X. For example, for adjacent first battery cell rows 2a and second battery cell rows 2b, the battery cell 2 of any one cell in the second battery cell row 2b is directly opposite the spacing between two adjacent battery cells 2 in the first battery cell row 2a in the second direction Y. For two adjacent second battery cell rows 2b, the battery cell 2 of any one cell in the second battery cell row 2b is directly opposite the spacing between two adjacent battery cells 2 in the other second battery cell row 2b in the second direction Y.

[0046] refer to Figure 4Correspondingly, the evaporation section 31 includes a first arc-shaped section 311 and a second arc-shaped section 312. Multiple first arc-shaped sections 311 and second arc-shaped sections 312 are provided, and they are alternately arranged along a first direction X. The arc-shaped openings of the first arc-shaped sections 311 and second arc-shaped sections 312 are in opposite directions, giving the evaporation section 31 a serpentine structure. When the evaporation section 31 is positioned between two second battery cell rows 2b, the heat-conducting pad 4 at any first arc-shaped section 311 can be attached to one battery cell 2 in one of the second battery cell rows 2b, and the heat-conducting pad 4 at any second arc-shaped section 312 can be attached to one battery cell 2 in the other second battery cell row 2b. This increases the heat exchange area between the evaporation section 31 and the second battery cell rows 2b, which is beneficial for improving the heat transfer efficiency between the evaporation section 31 and the second battery cell rows 2b, thereby improving the heat dissipation effect of the second battery cell rows 2b. The condenser 32 can be a plate-shaped structure located at one end of the evaporator 31. One side of the condenser 32 is attached to the housing 1 to ensure that there is sufficient heat exchange area between the condenser 32 and the housing 1.

[0047] In some embodiments of this application, the thermal pad 4 may optionally be a phase change material thermal pad. Specifically, the thermal pad 4 may be a thermal pad made of organic wax base, such as a paraffin thermal pad or a beeswax thermal pad; the thermal pad 4 may also be a thermal pad made of polymer, such as a polyethylene glycol thermal pad or a high-density polyethylene thermal pad; the thermal pad 4 may also be a thermal pad made of low-melting-point alloy, such as a tin-bismuth-indium alloy thermal pad.

[0048] The thermal pad 4, made of phase change material, typically has low thermal resistance, significantly improving the heat transfer efficiency between the second battery cell array 2b and the evaporator 31. When the second battery cell array 2b heats up, its temperature can melt the thermal pad 4 into a liquid state. At this time, the thermal pad 4 can absorb the heat from the second battery cell array 2b, further enhancing its heat dissipation. When the second battery cell array 2b suddenly heats up, the thermal pad 4 can simultaneously undergo a phase change to lower its temperature. This ensures effective cooling even when the second battery cell array 2b suddenly heats up. Therefore, using a phase change material for the thermal pad 4 also helps guarantee the reliability and timeliness of the heat dissipation effect.

[0049] refer to Figure 4In some embodiments of this application, optionally, the first direction X is in the same direction as the direction of gravity, and the condenser 32 is located above the evaporator 31. When the heat exchange medium in the evaporator 31 evaporates, the gaseous heat exchange medium can naturally drift into the condenser 32. After the heat exchange medium condenses into a liquid state in the condenser 32, it can fall back into the evaporator 31 under the action of gravity. In this way, the phase change of the heat exchange medium can be used to realize the circulation of the heat exchange medium in the evaporator 31 and the condenser 32, without the need to set up additional capillary structures or other structures to drive the circulation of the heat exchange medium in the heat exchange structure 3. This is beneficial to simplify the heat exchange structure 3 and reduce the processing cost of the heat exchange structure 3. Of course, in other embodiments, the first direction X can also be other directions, for example, the first direction X can also be a horizontal direction. In this case, a capillary structure needs to be set up in the heat exchange structure 3 so that the circulation of the heat exchange medium in the heat exchange structure 3 can be realized through the capillary force of the capillary structure.

[0050] In some embodiments of this application, the battery pack optionally includes a bracket 5. The bracket 5 is disposed within a receiving cavity 11 and has a mounting cavity 51 and a vent 52. (See reference...) Figure 2 The battery cell 2 is installed inside the mounting cavity 51 and fixedly connected to the bracket 5, with the vent 52 communicating with the mounting cavity 51. Air from inside the housing 1 can enter the mounting cavity 51 through the vent 52 and exchange heat with the battery cell 2 inside the mounting cavity 51. The heated air temperature rises and spontaneously convections with the air outside the mounting cavity 51. At this time, the hot air inside the mounting cavity 51 flows out through the vent 52, while the cold air outside the mounting cavity 51 flows in through the vent 52. The hot air flowing out of the mounting cavity 51 can exchange heat with the housing 1, allowing the heat generated by the battery cell 2 to be ultimately transferred from the housing 1 to the external environment. Because the battery cell 2 is installed inside the mounting cavity 51 of the bracket 5, the bracket 5 provides good protection for the battery cell 2. The vent 52 enhances the heat dissipation of the battery cell 2 inside the bracket 5 through air convection, thus improving the overall heat dissipation capacity of the battery pack.

[0051] In the embodiments described in this application, the support 5 is specifically composed of two independent parts. (See reference...) Figure 5Each independent section of the bracket 5 has a mounting hole 53. Two independent sections of the bracket 5 interlock to form a mounting cavity 51, at which point both ends of the battery cell 2 are inserted into the mounting hole 53 of one of the independent sections. To prevent the battery cell 2 from passing through the mounting hole 53, a protruding edge 54 is provided at the end of the mounting hole 53 facing away from the mounting cavity 51 to position the battery cell 2 within the mounting hole 53. A groove can be formed on the surface of the bracket 5, and a busbar 6 is embedded in the groove. Part of the busbar 6 is electrically connected to the battery cell 2 in the mounting hole 53 by welding, wire connection, or other means. With the connection of the busbar 6, all the battery cells 2 in the bracket 5 can be connected in series. The bracket 5 can be in direct contact with the housing 1, or a thermal pad can be provided between the housing 1 and the bracket 5 so that the heat of the battery cell 2 can be transferred to the housing 1 through the bracket 5, further improving the heat dissipation effect of the battery cell 2 in the battery pack.

[0052] refer to Figure 1 In some embodiments of this application, the outer surface of the housing 1 has protrusions 12, and multiple protrusions 12 are spaced apart. The outer surface of the housing 1 is the surface that contacts the external environment. The protrusions 12 on the outer surface of the housing 1 can increase the surface area of ​​the outer surface of the housing 1, thereby increasing the heat exchange area between the housing 1 and the external environment. This is beneficial to improving the heat exchange capacity and efficiency between the housing 1 and the external environment, thereby improving the heat dissipation capacity and efficiency of the battery pack. In addition, the protrusions 12 on the housing 1 also help to improve the rigidity of the housing 1. When the housing 1 is subjected to collisions or bumps, the protrusions 12 on the housing 1 help to reduce the deformation of the housing 1, thereby ensuring the safety of the battery cells 2 inside the battery pack. In the embodiments described in this application, the housing 1 is specifically cubic in shape. The surface of the housing 1 has protruding ribs, the protrusion direction of the ribs is opposite to the receiving cavity 11 of the housing 1, and the extension direction of the ribs is in the same direction as the first direction X.

[0053] Secondly, this application also provides an electrical device, which includes a battery pack as described in the first aspect. The electrical device can specifically be a motorcycle, electric bicycle, electric scooter, etc., or it can be a vehicle, energy storage device, etc. Because the electrical device uses a battery pack as described in the first aspect, the battery pack of the electrical device has better temperature uniformity. This can improve the operating capability of the electrical device and also help ensure the service life of the electrical device.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application.

[0055] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or at least two of the features. In the description of this utility model, unless otherwise stated, "at least two" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0056] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "left", "right", "clockwise", "counterclockwise", "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.

[0057] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0058] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "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 the present invention. 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 at least two embodiments or examples.

[0059] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A battery pack, characterized in that, The battery pack has a first direction (X) and a second direction (Y), the first direction (X) and the second direction (Y) intersecting, and includes: The housing (1) includes a receiving cavity (11); A battery cell (2) is disposed in the receiving cavity (11). Multiple battery cells (2) are disposed, and the multiple battery cells (2) are arranged along the first direction (X) to form a first battery cell column (2a) and a second battery cell column (2b). The first battery cell column (2a) is disposed in two columns spaced apart along the second direction (Y), and the second battery cell column (2b) is disposed between the two columns of the first battery cell column (2a). The heat exchange structure (3) has an evaporation section (31) and a condensation section (32). Both the evaporation section (31) and the condensation section (32) have flow channels for the flow of heat exchange medium, and the flow channels in the evaporation section (31) and the flow channels in the condensation section (32) are connected. The evaporation section (31) is adjacent to the second battery cell array (2b), and the condensation section (32) is in contact with the housing (1). When the heat exchange medium flows through the evaporation section (31), it evaporates and absorbs heat, and when it flows through the condensation section (32), it condenses and releases heat.

2. The battery pack according to claim 1, characterized in that, The battery pack includes a thermal pad (4); The thermal pad (4) is disposed on the side of the evaporation section (31) facing the second battery cell array (2b); one side of the thermal pad (4) is in contact with the evaporation section (31), and the other side of the thermal pad (4) is in contact with the second battery cell array (2b).

3. The battery pack according to claim 2, characterized in that, The second battery cell array (2b) is provided with at least two arrays, and the evaporation section (31) is provided between two adjacent arrays of the second battery cell array (2b). The heat-conducting pad (4) is provided on both sides of the evaporation section (31).

4. The battery pack according to claim 3, characterized in that, The second battery cell column (2b) is provided with an even number of columns, and the heat exchange structure (3) is provided with at least two columns. Two columns of the second battery cell column (2b) are provided between any two adjacent evaporation sections (31), and any second battery cell column (2b) is adjacent to and exchanges heat with only one evaporation section (31).

5. The battery pack according to claim 3, characterized in that, The battery cell (2) is a cylindrical battery cell, and the evaporation section (31) includes a first arc-shaped section (311) and a second arc-shaped section (312). The first arc-shaped section (311) and the second arc-shaped section (312) are provided in multiple ways and are alternately arranged along the first direction (X). The thermal pad (4) at any of the first arcuate portions (311) is attached to one of the cells (2) in one of the adjacent columns of the second cells (2b), and the thermal pad (4) at any of the second arcuate portions (312) is attached to one of the cells (2) in another adjacent column of the second cells (2b).

6. The battery pack according to any one of claims 2-5, characterized in that, The thermal pad (4) is a phase change material thermal pad.

7. The battery pack according to any one of claims 1-5, characterized in that, The first direction (X) is in the same direction as the direction of gravity, and the condensation section (32) is located above the evaporation section (31).

8. The battery pack according to any one of claims 1-5, characterized in that, The battery pack includes a bracket (5); The bracket (5) is disposed in the receiving cavity (11). The bracket (5) has a mounting cavity (51) and a vent (52). The battery cell (2) is disposed in the mounting cavity (51) and fixedly connected to the bracket (5). The vent (52) communicates with the mounting cavity (51).

9. The battery pack according to any one of claims 1-5, characterized in that, The outer surface of the box (1) has protrusions (12), and multiple protrusions (12) are spaced apart.

10. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1-9.

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