Battery apparatus and electrical apparatus

Abstract

The present application is applicable to the technical field of batteries. Provided are a battery apparatus (10) and an electrical apparatus. The battery apparatus (10) comprises a box body (2) and a plurality of battery cell assemblies (1). The box body (2) is provided with a first accommodating cavity (201), wherein the first accommodating cavity (201) is provided with a first inner wall (2011), and a second inner wall (2012) connected to the periphery of the first inner wall (2011); and on a projection plane perpendicular to a first direction (Z), the area of the orthographic projection of the first inner wall (2011) is a first area (S). The plurality of battery cell assemblies (1) are arranged in the first accommodating cavity (201) in a second direction (Y), and are arranged in the first direction (Z) with the first inner wall (2011). Each battery cell assembly (1) comprises N battery cells (11) arranged in a third direction (X), wherein the maximum dimension of each battery cell (11) in the third direction (X) is a first dimension (L1), the maximum dimension of each battery cell (11) in the second direction (Y) is a second dimension (L2), and at least one end of each battery cell (11) in the second direction (Y) is provided with an electrode terminal (111); and N≥1, N being a positive integer, and the first area (S) / (N*the first dimension (L1)*the second dimension (L2))∈[3, 8]. In this way, the battery apparatus (10) can take into account both energy density and temperature.

Description

Battery devices and electrical appliances

[0001] Cross-referencing

[0002] This application claims priority to Chinese patent application No. 202510011838.9, filed on January 3, 2025, with the State Intellectual Property Office of the People's Republic of China, entitled "Battery Device and Power Consumption Device", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of battery technology, specifically to a battery device and an electrical device. Background Technology

[0004] In related technologies, a power battery typically includes a housing and multiple battery cells, with the battery cells arranged inside the housing.

[0005] In some cases, the arrangement of battery cells within the casing allows for high space utilization and thus high energy density. However, this inevitably leads to significant temperature rise in the battery cells during operation, impacting their lifespan. In other cases, adjusting the cell arrangement reduces temperature rise and extends battery life. However, this inevitably reduces space utilization and energy density. Therefore, it's difficult to perfectly balance temperature and energy density in power batteries, making it challenging to achieve optimal performance for both. Summary of the Invention

[0006] In view of the above problems, the purpose of this application is to provide a battery device and an electrical device that can improve the technical problem that power batteries have difficulty in balancing energy density and temperature.

[0007] The technical solution adopted in the embodiments of this application is:

[0008] In a first aspect, embodiments of this application provide a battery device, including:

[0009] The box body has a first receiving cavity; the first receiving cavity has a first inner wall and a second inner wall connected to the outer periphery of the first inner wall; on a projection plane perpendicular to the first direction, the area of ​​the orthographic projection of the first inner wall is the first area;

[0010] Multiple battery cell assemblies are arranged in a first receiving cavity along a second direction and are arranged with the first inner wall along the first direction; the battery cell assembly includes N battery cells arranged along a third direction, the maximum size of the battery cell along the third direction is the first size, the maximum size of the battery cell along the second direction is the second size, and at least one end of the battery cell along the second direction is provided with an electrode terminal.

[0011] Where N≥1, N is a positive integer, and the first area / (N*first dimension*second dimension)∈[3,8]; the first direction, the second direction and the third direction are mutually perpendicular.

[0012] The battery device provided in this application includes a housing and a plurality of battery cell assemblies arranged in a first receiving cavity of the housing along a second direction. The battery cell assemblies and the first inner wall of the first receiving cavity are arranged along a first direction, and the area of ​​the orthographic projection of the first inner wall is a first area. The battery cell assembly includes N battery cells arranged along a third direction. The maximum size of the battery cell along the third direction is a first size, and the maximum size of the battery cell along the second direction is a second size. Electrode terminals are provided at opposite ends of the battery cells along the second direction, and the first area / (N * first size * second size) ∈ [3, 8], so that the number of battery cell assemblies in the first receiving cavity ∈ [3, 8]. This allows the battery cells to have a more suitable maximum size and number in the second direction, so that they can be arranged more compactly in the first receiving cavity of the housing. In this way, on the one hand, the battery cells have a more suitable flow path length, which helps to keep the temperature of the battery cells within an optimal range, thus extending the service life of the battery device. On the other hand, this allows the individual battery cells to have high packing efficiency in the second direction, enabling multiple battery cell modules to fully utilize the first housing cavity of the casing in the second direction. This helps improve the space utilization of the battery device and is beneficial for increasing the energy density of the battery device. Therefore, the battery device can balance temperature and energy density, allowing both to be within an optimal range.

[0013] In some embodiments, the second dimension is ≥200mm.

[0014] This allows the battery cells to have a suitable current path length, which can improve the problem of excessive heat generation caused by excessive current path length. This keeps the heat generation of the battery cells within an optimal range, thereby keeping the temperature of the battery cells within an optimal range and helping to extend the service life of the battery device.

[0015] In some embodiments, the second dimension is ≤400mm.

[0016] In some embodiments, the battery device has a length direction and a width direction, wherein the length of the battery device is greater than the width of the battery device; the second direction is either the length direction or the width direction of the battery device.

[0017] By adopting the above technical solution, battery cells can be arranged in the first receiving cavity of the box as needed, which can improve the flexibility and convenience of battery cell arrangement in the box.

[0018] In some embodiments, the second direction is the walking direction of the power-consuming device with a battery device; or, the third direction is the walking direction of the power-consuming device with a battery device.

[0019] By adopting the above technical solution, individual battery cells can be arranged in the first receiving cavity of the housing as needed, which can improve the flexibility and convenience of battery device arrangement on electrical devices.

[0020] In some embodiments, the second direction is the walking direction of the power-consuming device with a battery, and N∈[2, 16].

[0021] This configuration results in a smaller number of individual battery cells within the battery pack. Consequently, the arrangement of these battery cells in electrical devices offers greater flexibility.

[0022] In some embodiments, the second direction is the walking direction of the power-consuming device having a battery device, and in the second direction, the minimum gap between the electrode terminals of two adjacent battery cells is ≥2mm.

[0023] By adopting the above technical solution, the first gap between two adjacent battery cells in the second direction can be used to arrange separators, insulating adhesive, busbars, etc., so that in the direction of travel of the electrical device, the separators, etc. can provide a certain buffer protection for the two adjacent battery cells.

[0024] In some embodiments, the third direction is the walking direction of the power-consuming device with a battery, and N∈[2,30].

[0025] This configuration allows for a larger number of individual battery cells within the battery module. This, in turn, provides greater flexibility in the arrangement of these battery cells within the electrical device.

[0026] In some embodiments, the third direction is the walking direction of the power-consuming device with the battery device, N≥2, and in the third direction, the gap between the electrode terminals of two adjacent battery cells at the same end of the second direction is ≥5mm.

[0027] By adopting the above technical solution, in the third direction, a separator, insulating glue, etc. can be arranged between two adjacent battery cells, so that in the direction of travel of the electrical device, the second gap and the separator within it can provide a large degree of buffer protection for the battery cells.

[0028] In some embodiments, each of the battery cell has a first surface at both ends along the second direction, and electrode terminals extend from the first surface;

[0029] Each battery cell has a second surface on both sides of the third direction, and the area of ​​the first surface is smaller than the area of ​​the second surface.

[0030] By making the area of ​​the first surface smaller than the area of ​​the second surface, the maximum dimension of the battery cell along the second direction is greater than the maximum dimension of the battery cell along the third direction. Consequently, the maximum dimension of the battery cell along the second direction (i.e., the second dimension) is greater than the maximum dimension of the battery cell along the third direction (i.e., the first dimension). In other words, the length of the battery cell is greater than its thickness. This design allows the battery cell to have better heat dissipation capabilities, helping to reduce its temperature.

[0031] In some embodiments, the first dimension ∈ [10mm, 45mm].

[0032] This design allows the individual battery cells to have suitable dimensions along the third direction. On one hand, the dimensional design of the individual cells along this direction enables better heat dissipation, keeping their temperature within an optimal range and extending the battery's lifespan. On the other hand, given a predetermined maximum dimension (i.e., the fourth dimension) of the first inner wall along the third direction, the suitable dimensions of the individual cells allow for a suitable number of cells in the battery assembly, resulting in a more appropriate value for N. This leads to higher packing efficiency in the third direction, improving the space utilization of the battery device and increasing its energy density. Therefore, by adopting the above technical solution, both the temperature and energy density of the battery device can be kept within optimal ranges.

[0033] In some embodiments, the first dimension ∈ [15mm, 30mm].

[0034] By adopting the above technical solution, the battery cells can have a more suitable size along a third direction. This helps to keep the temperature and energy density of the battery device within an optimal range.

[0035] In some embodiments, a third surface is provided at both ends of the battery cell along the first direction, and the area of ​​the second surface is larger than the area of ​​the third surface.

[0036] By making the area of ​​the second surface larger than the area of ​​the third surface, the maximum dimension of the battery cell along the first direction is greater than the maximum dimension along the third direction; that is, the third dimension is greater than the first dimension, meaning the width of the battery cell is greater than its thickness. This design allows the battery cell to have better heat dissipation capabilities, thereby reducing its maximum temperature.

[0037] In some embodiments, the maximum dimension of the battery cell along the first direction is the third dimension, where the third dimension ∈ [60mm, 160mm].

[0038] By adopting the above technical solution, the battery cell has a suitable maximum size in the first direction, which helps to give the battery cell better heat dissipation capabilities and reduce the temperature of the battery cell. Furthermore, this design makes the battery cell a short-blade battery.

[0039] In some embodiments, the third dimension ∈ [80mm, 130mm].

[0040] By adopting the above technical solution, the battery cell has a more suitable maximum size in the first direction, which helps to give the battery cell better heat dissipation capacity and reduce the temperature of the battery cell.

[0041] In some embodiments, the box includes a box body and a beam structure disposed within the box body. The beam structure divides the internal space of the box body into a first receiving cavity and a second receiving cavity. The first receiving cavity and the second receiving cavity are distributed along a third direction, and a portion of the second inner wall is disposed on the beam structure.

[0042] By adopting the above technical solution, the battery device's casing can be divided into a first receiving cavity and a second receiving cavity.

[0043] In some embodiments, the enclosure includes two beam structures spaced apart within the enclosure body along a third direction, the two beam structures and the enclosure body forming a first receiving cavity and two second receiving cavities; in the third direction, the first receiving cavity is located between the two second receiving cavities.

[0044] By adopting the above technical solution, multiple battery cell modules are all housed within the first receiving cavity and confined between the two beam structures along the third direction. In this way, the two beam structures can resist the expansion of the battery cells in the third direction.

[0045] In some embodiments, each battery cell has at least one set of electrode terminals at both ends in the second direction, and each set of electrode terminals includes positive electrode terminals and negative electrode terminals spaced apart along the first direction.

[0046] By providing at least one set of electrode terminals with different polarities at each end of the battery cell along the second direction, the average current path of the battery cell can be effectively shortened, thereby reducing the internal resistance of the battery cell, reducing the heat generation of the battery cell, and thus reducing the temperature of the battery cell.

[0047] In some embodiments, at least one end of the battery cell along the second direction is provided with a pressure relief mechanism spaced apart from the electrode terminals.

[0048] By placing the pressure relief mechanism at at least one end of the battery cell along the second direction, the first receiving cavity of the housing can be effectively saved, thereby helping to improve the space utilization and energy density of the battery device. Furthermore, this facilitates the arrangement of thermal management components at opposite ends of the battery cell assembly along the first direction, and on this basis, the pressure relief mechanism can effectively achieve the pressure relief effect of the battery cell.

[0049] In some embodiments, in the second direction, insulating adhesive is provided between the battery cells of two adjacent battery cell assemblies.

[0050] And / or, N≥2, and in the third direction, insulating adhesive is provided between two adjacent battery cells.

[0051] By placing insulating adhesive between adjacent battery cells, two things are achieved: firstly, it provides insulation between the cells, reducing adverse interactions and allowing the battery assembly to perform at its best; secondly, it simplifies the fixing of multiple battery cell assemblies, facilitating assembly and improving production efficiency. Furthermore, the insulating adhesive provides protection during thermal runaway of battery cells, mitigating high-voltage arcing caused by particulate matter ejected from the cells.

[0052] In some embodiments, the battery cell is provided with a pressure relief mechanism spaced apart from the electrode terminals, and at least a portion of the insulating adhesive is provided on the electrode terminals and avoids the pressure relief mechanism.

[0053] By applying at least a portion of the insulating adhesive to the electrode terminals, insulation and fixation can be achieved between adjacent battery cells. Furthermore, by bypassing the pressure relief mechanism, the insulating adhesive facilitates the pressure relief mechanism's function.

[0054] In some embodiments, the pressure relief mechanism and the electrode terminals are spaced apart along a first direction; in the first direction, the insulating adhesive extends beyond the electrode terminals and is spaced apart from the pressure relief mechanism.

[0055] This design allows the insulating adhesive to be placed on the electrode terminals while avoiding the pressure relief mechanism. This enables the insulating adhesive to provide insulation protection, fixation, and thermal runaway protection, and also ensures the function of the pressure relief mechanism to a certain extent.

[0056] In some embodiments, in the second direction, a separator is provided between the battery cells of two adjacent battery cell assemblies;

[0057] And / or, N≥2, and in the third direction, a separator is provided between two adjacent battery cells.

[0058] Adjacent battery cells can be separated by a separator. On one hand, the separator isolates the high voltage between adjacent cells, reducing adverse effects between them and allowing the battery assembly to perform at its best. On the other hand, it improves the overall strength of the battery array, reducing the adverse effects of external factors such as vibration on the battery cell assembly, thus effectively enhancing the adaptability of the battery assembly.

[0059] In some embodiments, the housing includes a thermal management component disposed at at least one end of the battery cell assembly along a first direction, the thermal management component being connected to the battery cell to regulate the temperature of the battery cell.

[0060] By providing thermal management components at both ends of the battery cell assembly along the first direction, the thermal management components at both ends of the battery cell assembly can perform thermal management on the battery cell assembly. This improves the thermal management efficiency of the battery cell assembly, thereby helping to reduce the temperature of the individual battery cells. Furthermore, it helps to improve the temperature uniformity of multiple battery cell assemblies, thus helping to extend the lifespan of the battery device.

[0061] Secondly, embodiments of this application provide an electrical device, including a battery device.

[0062] The electrical device provided in this application embodiment, by employing the battery device mentioned above, enables the battery device to balance energy density and temperature, thereby improving the performance and reliability of the battery device, which in turn helps to improve the performance and reliability of the electrical device.

[0063] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0064] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or exemplary technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0065] Figure 1 is a schematic diagram of a vehicle provided in some embodiments of this application;

[0066] Figure 2 is an exploded view of a battery device provided in some embodiments of this application;

[0067] Figure 3 is a schematic diagram of a battery device provided in some other embodiments of this application;

[0068] Figure 4 is an exploded view of the battery device shown in Figure 3;

[0069] Figure 5 is a three-dimensional structural diagram of a battery cell of a battery device provided in some embodiments of this application;

[0070] Figure 6 is a partial schematic diagram of the battery device housing shown in Figure 3;

[0071] Figure 7 is a partial schematic diagram of the battery device shown in Figure 3;

[0072] Figure 8 is an enlarged view of point A in Figure 7;

[0073] Figure 9 is a schematic diagram of a battery cell assembly of a battery device provided in some embodiments of this application;

[0074] Figure 10 is a cross-sectional view of Figure 3 along BB;

[0075] Figure 11 is a partial enlarged view of Figure 10;

[0076] Figure 12 is a partial schematic diagram of a battery device provided in some embodiments of this application;

[0077] Figure 13 is an enlarged view of point C in Figure 12;

[0078] Figure 14 is a three-dimensional structural diagram of multiple battery cell components and busbar components of the battery device provided in Figure 3.

[0079] In the figures, the following reference numerals are used: 3000 - Vehicle; 3100 - Controller; 3200 - Motor; 10 - Battery device; 1 - Battery cell assembly; 101 - First surface; 102 - Second surface; 103 - Third surface; 11 - Battery cell; 111 - Electrode terminal; 111a - Positive electrode terminal; 111b - Negative electrode terminal; 112 - Cell body; 1121 - Outer shell; 11211 - Housing; 11212 - End cap; 113 - Pressure relief mechanism; 2 - Housing; 201 - First receiving cavity; 2011 - First inner wall; 2012 - Second inner wall; 201 21-First partition; 20122-Second partition; 202-Second receiving cavity; 21-First part; 22-Second part; 211-Box body; 2111-Thermal management component; 212-Beam structure; 213-Separation component; 3-Busting component; S-First area; L1-First dimension; L2-Second dimension; L3-Third dimension; L4-Fourth dimension; L5-Fifth dimension; H1-First gap; H2-Second gap; a-Length direction; b-Width direction; c-Travel direction; Z-First direction; Y-Second direction; X-Third direction. Detailed Implementation

[0080] The embodiments of this application are described in detail below. 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 intended to explain this application, and should not be construed as limiting this application.

[0081] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0082] Unless otherwise specified, all technical features and optional technical features of the embodiments of this application can be combined with each other to form new technical solutions.

[0083] In the description of the embodiments of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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 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.

[0084] Furthermore, 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 with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0085] In the description of the embodiments of this application, "multiple" means two or more, and unless otherwise explicitly specified, "two or more" includes two. Correspondingly, "multiple groups" means two or more groups, including two groups.

[0086] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "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 or an electrical 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. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0087] In the description of this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three possibilities: A exists, A and B exist simultaneously, and B exists. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0088] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms "proximity" and "adjacent" refer to proximity in location. For example, among three components A1, A2, and B, if the distance between A1 and B is greater than the distance between A2 and B, then A2 is closer to B than A1, meaning A2 is adjacent to B. Alternatively, B can be said to be adjacent to A2; in other words, A2 is adjacent to B. Similarly, when there are multiple components C, namely C1, C2, ... CN, if one component C, such as C2, is closer to component B than the other components C, then B is adjacent to C2; in other words, C2 is adjacent to B.

[0089] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0090] From a market perspective, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.

[0091] A power battery typically includes a housing and multiple battery cells, with the battery cells arranged inside the housing.

[0092] In some cases, the arrangement of battery cells within the casing allows for high space utilization and thus high energy density. However, this inevitably leads to significant temperature rise in the battery cells during operation, impacting their lifespan. In other cases, adjusting the cell arrangement reduces temperature rise and extends battery life. However, this inevitably reduces space utilization and energy density. Therefore, it's difficult to perfectly balance temperature and energy density in power batteries, making it challenging to achieve optimal performance for both.

[0093] For example, along the general direction of the current flow path of a battery cell, the maximum size of the battery cell can be set very large to reduce the number of battery cells in that direction. This saves on the arrangement of components between adjacent battery cells in that direction, saves on the arrangement of the battery cell casing in that direction, and improves the space waste caused by the arrangement tolerance between adjacent battery cells. This can improve the space utilization rate of the power battery and increase its energy density. However, this makes the current flow path of the battery cell very long, and the heat generation of the battery cell increases accordingly. This inevitably leads to a large temperature rise in the battery cell, resulting in a higher battery cell temperature and affecting the service life of the power battery.

[0094] For example, along the general direction of the current flow path of a battery cell, the maximum size of the battery cell can be set very small to increase the number of battery cells in that direction. This reduces the current flow path of the battery cells, thereby reducing the heat generated by the battery cells and thus reducing the temperature rise and temperature of the battery cells. However, this requires adaptive arrangement between adjacent battery cells in that direction, which inevitably reduces the packing efficiency of the battery cells in that direction, thereby reducing the space utilization of the power battery and thus reducing the energy density of the power battery.

[0095] Based on the above considerations, this application provides a battery device and an electrical device. The battery device includes a housing and a plurality of battery cell assemblies arranged in a first receiving cavity of the housing along a second direction. The battery cell assemblies and the first inner wall of the first receiving cavity are arranged along a first direction, and the area of ​​the orthographic projection of the first inner wall is a first area. The battery cell assembly includes N battery cells arranged along a third direction. The maximum size of the battery cell along the third direction is a first size, and the maximum size of the battery cell along the second direction is a second size. Electrode terminals are provided at opposite ends of the battery cells along the second direction, and the first area / (N * first size * second size) ∈ [3, 8], so that the number of battery cell assemblies in the first receiving cavity ∈ [3, 8]. This allows the battery cells to have a more suitable maximum size and number in the second direction, so that they can be arranged more compactly in the first receiving cavity of the housing. In this way, on the one hand, the battery cells have a more suitable flow path length, which helps to keep the temperature of the battery cells within an optimal range, thus extending the service life of the battery device. On the other hand, this allows the individual battery cells to have high packing efficiency in the second direction, enabling multiple battery cell modules to fully utilize the first housing cavity of the casing in the second direction. This helps improve the space utilization of the battery device and is beneficial for increasing the energy density of the battery device. Therefore, the battery device can balance temperature and energy density, allowing both to be within an optimal range.

[0096] It should be noted that although the battery device provided in this application is developed based on the difficulty in balancing temperature and energy density inherent in power batteries, its application scenarios are not limited to power batteries. Understandably, the battery device can be a power battery, or an energy storage battery, etc.

[0097] The battery device involved in the embodiments of this application can be a single physical module comprising one or more battery cells, used to provide voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel, or in a mixed connection via a busbar. A mixed connection refers to multiple battery cells being connected in both series and parallel configurations.

[0098] In some embodiments, the battery device may include a housing and individual battery cells. As an example, the individual battery cells may be directly housed within the housing. As another example, multiple individual battery cells may first be assembled into one or more battery modules and then housed within the housing.

[0099] When there are multiple battery cells, they can be arranged and fixed to form a battery module. As an example, multiple battery cells can be fixed to form a battery module using cable ties or similar means. As another example, multiple battery cells can also be fixed to form a battery module using end plates, side plates, or similar means.

[0100] A battery cell is the smallest unit used to store and output electrical energy. A battery cell can be either a rechargeable battery or a primary battery. A rechargeable battery is a battery cell that can be recharged after being discharged, allowing the active materials to be reactivated and reused.

[0101] The battery cells can be cylindrical, flat, cuboid, or other shapes. Battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0102] The battery device involved in the embodiments of this application can be an energy storage device, such as an energy storage container or an energy storage cabinet.

[0103] The battery device provided in this application embodiment can also be used in electrical devices that use a battery device as a power source.

[0104] Electrical devices can include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, vehicles, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft. Based on the power source, vehicles can be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles. Based on the drive method, vehicles can be front-wheel drive vehicles, rear-wheel drive vehicles, or four-wheel drive vehicles.

[0105] For ease of description, this application uses a vehicle as an example to illustrate the embodiments of the electrical device.

[0106] In some embodiments, please refer to FIG1, which is a schematic diagram of a vehicle 3000 provided in some embodiments of this application. A battery device 10 is disposed inside the vehicle 3000, and the battery device 10 may be located at the bottom, front, or rear of the vehicle 3000. The battery device 10 can be used to power the vehicle 3000; for example, the battery device 10 can serve as the operating power source for the vehicle 3000. The vehicle 3000 may also include a controller 3100 and a motor 3200. The controller 3100 is used to control the battery device 10 to supply power to the motor 3200, for example, to meet the power requirements of the vehicle 3000 during startup, navigation, and driving.

[0107] In some embodiments, the battery device 10 can not only serve as the operating power source for the vehicle 3000, but also as the driving power source for the vehicle 3000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 3000.

[0108] In some embodiments, please refer to Figures 2 to 4 together. Figure 2 is an exploded view of the battery device 10 provided in some embodiments of this application, Figure 3 is a schematic diagram of the battery device 10 provided in other embodiments of this application, and Figure 4 is an exploded view of the battery device 10 provided in Figure 3. The battery device 10 may include a housing 2 and a battery cell 11. The housing 2 is a structure with internal space, and the internal space of the housing 2 is used to accommodate the battery cell 11.

[0109] The housing 2 can adopt various structures. In some embodiments, the housing 2 may include a first part 21 and a second part 22, which overlap each other and together define the internal space of the housing 2, which is a closed space. Here, "closed" means covered or closed, and can be sealed or unsealed. That is, the housing 2 can be a sealed structure or an unsealed structure.

[0110] Referring to Figure 2, both the first part 21 and the second part 22 can be hollow structures with an opening at one end. The open side of the first part 21 covers the open side of the second part 22, so that the first part 21 and the second part 22 together define the internal space of the box 2. Alternatively, as shown in Figures 3 and 4, the first part 21 can be a hollow structure with an opening at one end, and the second part 22 is a plate-like structure. The second part 22 covers the open side of the first part 21, so that the first part 21 and the second part 22 together define the internal space of the box 2. The box 2 composed of the first part 21 and the second part 22 can be of various shapes, such as a cylinder, a cuboid, etc.

[0111] In some embodiments, multiple battery cells 11 can be connected in series, parallel, or mixed to form a whole, and then the whole formed by the multiple battery cells 11 is directly housed in the internal space of the housing 2. In other embodiments, multiple battery cells 11 can also be connected in series, parallel, or mixed to form a battery module, and the battery module is housed in the internal space of the housing 2. In still other embodiments, multiple battery cells 11 can also be connected in series, parallel, or mixed to form multiple battery modules, and the multiple battery modules can then be connected in series, parallel, or mixed to form a whole, and housed in the internal space of the housing 2.

[0112] In some embodiments, referring to Figures 1, 2, and 4, the housing 2 of the battery device 10 can be part of the chassis structure of the vehicle 3000. For example, a portion of the housing 2 can be at least a portion of the floor of the vehicle 3000, or a portion of the housing 2 can be at least a portion of the crossbeams and longitudinal beams of the vehicle 3000.

[0113] In some embodiments, please refer to FIG5, and in conjunction with other accompanying drawings. FIG5 is a perspective structural diagram of a battery cell 11 of a battery device 10 provided in some embodiments of this application. The battery cell 11 provided in the embodiments of this application may include an electrode assembly and a housing 1121.

[0114] The electrode assembly is the component in the battery cell 11 where the electrochemical reaction occurs. The electrode assembly is mainly formed by winding or stacking positive and negative electrode sheets, with a separator between them. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly, while the portions without active material each constitute a tab. The tab of the positive electrode sheet is called the positive tab, and the tab of the negative electrode sheet is called the negative tab. The positive and negative tabs can be located together at one end of the main body; alternatively, they can be located at opposite ends of the main body.

[0115] In a single battery cell 11, the number of electrode components can be one or more.

[0116] In some contexts, electrode assemblies may also be referred to as bare cells, wound bodies, laminates, etc.

[0117] In some embodiments, the battery cell 11 may further include an electrolyte, which acts as a conductor of ions between the positive and negative electrode plates. The electrolyte described in this application embodiment may be liquid, gel-like, or solid.

[0118] The housing 1121 is used to define the internal environment of the battery cell 11 and to house the electrode assembly and electrolyte.

[0119] In some embodiments, please refer to FIG5 and other figures. The housing 1121 may include a housing 11211 and an end cap 11212, which are components used to jointly define the internal environment of the battery cell 11. The internal environment defined by the housing 11211 and the end cap 11212 is used to house the electrode assembly and the electrolyte. The housing 11211 and the end cap 11212 may be separate components. Specifically, the housing 11211 has an opening, and the end cap 11212 is disposed over the opening of the housing 11211 to jointly define the internal environment of the battery cell 11 and isolate the internal environment of the battery cell 11 from the external environment. Alternatively, the housing 11211 and the end cap 11212 can also be an integrated structure. Specifically, the end cap 11212 and the housing 11211 can form a common connection surface before the electrode assembly is inserted into the housing. When the electrode assembly is inserted into the housing and needs to be encapsulated, the end cap 11212 is then used to cover the housing 11211.

[0120] The outer casing 1121 can be either a sealed or unsealed structure. As an example, when the outer casing 1121 is a sealed structure, it protects the electrode assembly and, to some extent, prevents leakage such as electrolyte leakage. As an example, when the outer casing 1121 is an unsealed structure, it still protects the electrode assembly. A sealing bag may also be included between the outer casing 1121 and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag can be a bag-shaped insulating structure, an aluminum-plastic film, etc.

[0121] The number of end caps 11212 can be one. Alternatively, as shown in Figure 5, the number of end caps 11212 can also be two, with the two end caps 11212 respectively located at opposite ends of the housing 11211.

[0122] The housing 11211 can be cylindrical, square, or other shapes, depending on the specific shape and size of the electrode assembly. Furthermore, the housing 11211 and end cap 11212 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic.

[0123] In some embodiments, please refer to FIG5, and in conjunction with other figures. The battery cell 11 may also include electrode terminals 111. Electrode terminals 111 are components with conductive properties, serving as current transmission terminals for the battery cell 11 to transmit current. The electrode terminals 111 may be, but are not limited to, posts.

[0124] Electrode terminal 111 is electrically connected to the electrode assembly. Specifically, electrode terminal 111 is electrically connected to the tab of the electrode assembly. The electrode terminal 111 can be directly electrically connected to the tab by welding, bonding, or other methods. Alternatively, a transition structure can be provided between electrode terminal 111 and the tab to facilitate current flow, thereby indirectly achieving a conductive connection between electrode terminal 111 and the tab. The transition structure refers to a conductive metal structure, such as, but not limited to, a copper busbar.

[0125] In some embodiments, please refer to FIG5 and other figures. The electrode terminals 111 are configured to be at least two, and the at least two electrode terminals 111 may include a positive electrode terminal 111a and a negative electrode terminal 111b. The positive electrode terminal 111a is electrically connected to the positive electrode tab of the electrode assembly, and the negative electrode terminal 111b is electrically connected to the negative electrode tab of the electrode assembly.

[0126] In some embodiments, please refer to FIG5 and other accompanying drawings. Electrode terminals 111 are disposed on the housing 1121. Specifically, electrode terminals 111 can be disposed on the housing 11211 of the housing 1121, or on the end cap 11212 of the housing 1121. Positive electrode terminal 111a and negative electrode terminal 111b can be simultaneously disposed on the housing 11211. Alternatively, as shown in FIG5, positive electrode terminal 111a and negative electrode terminal 111b are simultaneously disposed on the end cap 11212. Alternatively, electrode terminals 111 are disposed on both the housing 11211 and the end cap 11212.

[0127] The outer casing 1121 may be provided with a positive electrode terminal 111a and a negative electrode terminal 111b at the same end, and the outer casing 1121 may also be provided with a positive electrode terminal 111a and a negative electrode terminal 111b at opposite ends.

[0128] Please refer to Figures 4 through 11, and in conjunction with other accompanying drawings. Figure 6 is a partial schematic diagram of the housing 2 of the battery device 10 shown in Figure 3, specifically a schematic diagram of the first part 21 of the housing 2 from a first direction Z, where the shaded area represents the first area S. Figure 7 is a partial schematic diagram of the battery device 10 shown in Figure 3, specifically a partial schematic diagram of the battery device 10 from a first direction Z. Figure 8 is an enlarged view of point A in Figure 7. Figure 9 is a schematic diagram of the battery cell assembly 1 of the battery device 10 provided in some embodiments of this application, specifically a schematic diagram of the battery cell assembly 1 from a first direction Z. Figure 10 is a cross-sectional view along BB in Figure 3, and Figure 11 is a partial enlarged view of Figure 10. The battery device 10 provided in the embodiments of this application includes a housing 2 and multiple battery cell assemblies 1. The housing 2 has a first receiving cavity 201. The first receiving cavity 201 has a first inner wall 2011 and a second inner wall 2012, with the second inner wall 2012 connected to the outer periphery of the first inner wall 2011. On a projection plane perpendicular to the first direction Z, the area of ​​the orthographic projection of the first inner wall 2011 is the first area S. Multiple battery cell assemblies 1 are arranged along the second direction Y within the first receiving cavity 201, and are arranged with the first inner wall 2011 along the first direction Z. Each battery cell assembly 1 includes N battery cells 11 arranged along a third direction X. The maximum dimension of each battery cell 11 along the third direction X is a first dimension L1, and the maximum dimension of each battery cell 11 along the second direction Y is a second dimension L2. At least one end of each battery cell 11 along the second direction Y is provided with an electrode terminal 111. Wherein, N≥1, N is a positive integer, and the first area S / (N*first dimension L1*second dimension L2)∈[3, 8]. Wherein, the first direction Z is perpendicular to the second direction Y, the first direction Z is perpendicular to the third direction X, and the second direction Y is perpendicular to the third direction X.

[0129] The first receiving cavity 201 refers to the space inside the housing 2 for accommodating the battery cell 11. The first inner wall 2011 and the second inner wall 2012 are both inner wall surfaces of the first receiving cavity 201. As an example, the first receiving cavity 201 is disposed in the first part 21 of the housing 2, and the first inner wall 2011 and the second inner wall 2012 are both disposed on the first part 21 of the housing 2.

[0130] The inner wall of the first receiving cavity 201 along one side of the first direction Z is a first inner wall 2011. As an example, the first inner wall 2011 is generally square, and the second inner wall 2012 includes two first partition walls 20121 and two second partition walls 20122. The two first partition walls 20121 are arranged opposite each other along the second direction Y and are respectively located on two opposite sides of the first inner wall 2011 along the second direction Y. The two second partition walls 20122 are arranged opposite each other along the third direction X and are respectively located on two opposite sides of the first inner wall 2011 along the third direction X. Based on this, the second inner wall 2012 is connected to the outer periphery of the first inner wall 2011.

[0131] As shown in Figure 6, the maximum dimension of the first partition wall 20121 in the third direction X is the fourth dimension L4, and the maximum dimension of the second partition wall 20122 in the second direction Y is the fifth dimension L5.

[0132] In the second direction Y, the battery cell assembly 1 is disposed between two first partition walls 20121. In the third direction X, the battery cell assembly 1 is disposed between two second partition walls 20122. Furthermore, the battery cell assembly 1 and the first inner wall 2011 are arranged along the first direction Z. Based on this, multiple battery cell assemblies 1 are disposed in the first receiving cavity 201.

[0133] It should be noted that the view of the projection plane perpendicular to the first direction Z is the same as that in Figure 6. Based on this, the orthographic projection of the first inner wall 2011 on the projection plane perpendicular to the first direction Z can be referenced in Figure 6. Among them, the area of ​​the orthographic projection of the first inner wall 2011 on the projection plane perpendicular to the first direction Z is equal to the fourth dimension L4 * the fifth dimension L5.

[0134] Multiple battery cell assemblies 1 are arranged along the second direction Y within the first receiving cavity 201 and along the first inner wall 2011 along the first direction Z. This means that multiple battery cell assemblies 1 are arranged within the first receiving cavity 201, along the second direction Y, and each battery cell assembly 1 is arranged along the first inner wall 2011 along the first direction Z. However, the arrangement of battery cell assemblies 1 within the first receiving cavity 201 does not mean that each battery cell assembly 1 is completely located within the first receiving cavity 201. It can be understood that at least a portion of each battery cell assembly 1 is accommodated within the first receiving cavity 201.

[0135] A battery cell assembly 1 comprises N battery cells 11 arranged along a third direction X. This means that the battery cell assembly 1 includes N battery cells 11, and when N ≥ 2, the N battery cells 11 in the battery cell assembly 1 are arranged along a third direction X. N can be 1 or greater than 1, for example, it can be 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, etc.

[0136] Understandably, the battery cell 11 has an electrode terminal 111 at one end along the first direction Y; or, as shown in Figure 5, the battery cell 11 has electrode terminals 111 at both opposite ends along the first direction Y.

[0137] Understandably, a battery cell 11 may include a cell body 112 and electrode terminals 111, and the number of electrode terminals 111 may be multiple. The multiple electrode terminals 111 may be located at one end of the cell body 112 along the second direction Y; or, as shown in Figure 5, the multiple electrode terminals 111 may be located at opposite ends of the cell body 112 along the second direction Y. The cell body 112 is the main body of the battery cell 11, and includes a housing 1121, electrode assemblies disposed within the housing 1121, electrolyte disposed within the housing 1121, etc. The second direction Y is the approximate distribution direction of the cell body 112 and the electrode terminals 111. It should be noted that the maximum dimension of the battery cell 11 along the second direction Y refers to the maximum dimension of the entire assembly formed by the cell body 112 and the electrode terminals 111 in the second direction Y. That is, when electrode terminals 111 are located at opposite ends of the cell body 112 along the second direction Y, the maximum dimension between the electrode terminals 111 at opposite ends of the cell body 112 along the second direction Y is the second dimension L2.

[0138] It should be further explained that, based on the arrangement of electrode terminals 111 at one end of the battery cell 11 along the second direction Y, given a predetermined maximum dimension of the internal space of the housing 2 along the second direction Y, the size of the cell body 112 of each row of battery cells 11 in the second direction Y can be made very large. That is, the housing 2 can accommodate cell bodies 112 with very large dimensions along the second direction Y, which helps to improve the energy density of the battery device 10. The arrangement of electrode terminals 111 at both opposite ends of the battery cell 11 along the second direction Y facilitates current flow control in the battery cell 11.

[0139] The maximum dimension of the battery cell 11 along the third direction X refers to the maximum dimension of the main body 112 of the battery cell 11 along the third direction X, which is also the maximum dimension of the outer casing 1121 along the third direction X, and is the first dimension L1.

[0140] By using the first area S / (N*first dimension L1*second dimension L2)∈[3,8], the number of battery cell components 1 can be approximately M, where M∈[3,8] and M is a positive integer. That is, M can be 3, 4, 5, 6, 7, or 8. Understandably, M battery cell components 1 can form M rows and N columns of battery cells 11, with each row containing N battery cells 11 and each column containing approximately M battery cells 11.

[0141] Wherein, the first direction Z is perpendicular to the second direction Y, the first direction Z is perpendicular to the third direction X, and the second direction Y is perpendicular to the third direction X, all of which mean approximately perpendicular, that is, a certain degree of deviation is allowed.

[0142] The battery device 10 provided in this application embodiment includes a housing 2 and a plurality of battery cell assemblies 1. The plurality of battery cell assemblies 1 are arranged along a second direction Y in a first receiving cavity 201 of the housing 2. The battery cell assemblies 1 and the first inner wall 2011 of the first receiving cavity 201 are arranged along a first direction Z. The area of ​​the orthographic projection of the first inner wall 2011 is a first area S. The battery cell assembly 1 includes N battery cells 11 arranged along a third direction X. The maximum dimension of the battery cell 11 along the third direction X is a first dimension L1, and the maximum dimension of the battery cell 11 along the second direction Y is a second dimension L2. The size L2, the battery cell 11 has electrode terminals 111 at both ends along the second direction Y, and the first area S / (N*first size L1*second size L2)∈[3,8], so that the number of battery cell assemblies 1 in the first receiving cavity 201∈[3,8]. It can be understood that the number of battery cells 11 in each row∈[3,8]. Thus, given the maximum size of the first inner wall 2011 along the second direction Y, the battery cells 11 can have a more suitable maximum size and number in the second direction Y, so as to be arranged more compactly in the first receiving cavity 201 of the housing 2.

[0143] With this configuration, on the one hand, the battery cell 11 has a suitable maximum size in the second direction Y, which allows the battery cell 11 to have a suitable current path length. This helps to improve the problem of excessive heat generation caused by the excessive current path of the battery cell 11, helps to reduce the temperature rise of the battery cell 11, lowers the temperature of the battery cell 11, and keeps the heat generation of the battery cell 11 within an optimal range. This keeps the temperature of the battery cell 11 within an optimal range, which is beneficial to extending the service life of the battery device 10. On the other hand, each row of battery cells 11 has a suitable number of battery cells 11, resulting in high packing efficiency for each row of battery cells 11 in the second direction Y. This can be achieved, for example, by saving components between adjacent battery cells 11 along the second direction Y, saving the outer casings 1121 at opposite ends of the battery cells 11 along the second direction Y, and reducing space waste caused by arrangement tolerances between adjacent battery cells 11 along the second direction Y. This allows multiple battery cell assemblies 1 to fully utilize the first receiving cavity 201 of the housing 2 in the second direction Y, helping to improve the space utilization of the battery device 10 and thus increasing its energy density. Therefore, by adopting the above technical solution, the temperature and energy density of the battery device 10 can both be within an optimal range, allowing the battery device 10 to balance the advantages of low temperature and high energy density, improving its performance and reliability. In this way, the battery device 10 can possess high-efficiency fast charging capability.

[0144] It should be further explained that by adopting the above technical solution, each row of battery cells 11 can be arranged relatively compactly in the first receiving cavity 201 of the housing 2 along the second direction Y, thereby allowing multiple battery cell assemblies 1 to be arranged relatively compactly in the first receiving cavity 201 of the housing 2 along the second direction Y. In this way, on the one hand, the battery cells 11 of the multiple battery cell assemblies 1 can be arranged relatively compactly along the second direction Y, and the battery cells 11 and the second inner wall 2012 can be arranged relatively compactly, which helps to improve the space utilization of the battery device 10 and improve the energy density of the battery device 10. On the other hand, the arrangement of the battery cells 11 of the multiple battery cell assemblies 1 is not excessively compact, thus facilitating heat dissipation of the battery cells 11 and helping to reduce the temperature of the battery cells 11.

[0145] In some embodiments, the battery cell 11 can be approximately cylindrical in shape, and the second direction Y is approximately the length extension direction of the battery cell 11, that is, the axial direction of the battery cell 11.

[0146] In some embodiments, as shown in FIG5 and in conjunction with other figures, the battery cell 11 can be approximately rectangular in structure, and the battery cell 11 has a length, a width, and a thickness. The length of the battery cell 11 can be greater than its width and its thickness. The first direction Z can be approximately the width extension direction of the battery cell 11, the second direction Y can be approximately the length extension direction of the battery cell 11, and the third direction X can be approximately the thickness extension direction of the battery cell 11.

[0147] In some embodiments, please refer to Figures 7 through 11 together with other figures. The second dimension L2 ≤ 400 mm.

[0148] The second dimension L2 ≤ 400mm, specifically it can be 50mm, 100mm, 150mm, 200mm, 250mm, 300mm, 350mm, 400mm, etc.

[0149] In some embodiments, please refer to Figures 7 through 11 together with other figures. The second dimension L2 ≥ 200 mm.

[0150] Understandably, the second dimension L2 ∈ [200mm, 400mm], that is, 200mm ≤ second dimension L2 ≤ 400mm. The second dimension L2 can specifically be 200mm, 210mm, 220mm, 230mm, 240mm, 250mm, 260mm, 270mm, 280mm, 290mm, 300mm, 310mm, 320mm, 330mm, 340mm, 350mm, 360mm, 370mm, 380mm, 390mm, 400mm, etc.

[0151] By adopting the above technical solution, the maximum dimension (i.e., the second dimension L2) of the battery cell 11 in the second direction Y has a certain range. This allows the battery cell 11 to have a current path of suitable length, thus mitigating the problem of excessive heat generation caused by an excessively large current path. The heat generation of the battery cell 11 is kept within an optimal range, thereby keeping the temperature of the battery cell 11 within an optimal range and extending the service life of the battery device 10.

[0152] In some embodiments, please refer to Figures 3, 4, 6, 7, and 11 together, and in conjunction with other figures. The battery device 10 has a length direction a and a width direction b, and the length of the battery device 10 is greater than the width of the battery device 10.

[0153] Understandably, the battery device 10 is approximately rectangular in structure, that is, the housing 2 is approximately rectangular in structure, so that the battery device 10 has a length direction a and a width direction b.

[0154] The length of the battery device 10 is greater than its width, which means that the maximum dimension of the battery device 10 along the length direction a is greater than the maximum dimension of the battery device 10 along the width direction b.

[0155] In some possible designs, as shown in Figure 7, the second direction Y is the length direction a of the battery device 10. The maximum dimension of the battery device 10 along the second direction Y can be the length of the battery device 10. The third direction X can be, but is not limited to, the width direction b of the battery device 10, and the maximum dimension of the battery device 10 along the third direction X can be the width of the battery device 10.

[0156] Alternatively, in some other possible designs, as shown in Figure 12, which is a partial schematic diagram of a battery device 10 provided in some embodiments of this application, the second direction Y is the width direction b of the battery device 10. The maximum dimension of the battery device 10 along the second direction Y can be the width of the battery device 10. The third direction X can be, but is not limited to, the length direction a of the battery device 10, and the maximum dimension of the battery device 10 along the third direction X can be the length of the battery device 10.

[0157] By adopting the above technical solution, the battery cell 11 can be arranged in the first receiving cavity 201 of the box 2 as needed, which can improve the flexibility and convenience of arranging the battery cell 11 in the box 2.

[0158] In some embodiments, please refer to FIG7, and in conjunction with other figures. The second direction Y is the travel direction c of the electrical device having the battery device 10.

[0159] As an example, when the electrical device is vehicle 3000, the traveling direction c of the electrical device is the length direction a of vehicle 3000.

[0160] Understandably, when the second direction Y is the length direction a of the battery device 10, as shown in Figure 7, the length direction a of the battery device 10 is the travel direction c of the power-consuming device. When the second direction Y is the width direction b of the battery device 10, the width direction b of the battery device 10 is the travel direction c of the power-consuming device.

[0161] In some embodiments, please refer to FIG12, and in conjunction with other figures. The third direction X is the travel direction c of the electrical device having the battery device 10.

[0162] Understandably, when the third direction X is the length direction a of the battery device 10, as shown in Figure 12, the length direction a of the battery device 10 is the traveling direction c of the power-consuming device. The second direction Y is perpendicular to the length direction a of the battery device 10; for example, the second direction Y can be the width direction b of the battery device 10.

[0163] When the third direction X is the width direction b of the battery device 10, the width direction b of the battery device 10 is the traveling direction c of the power-consuming device. The second direction Y is perpendicular to the width direction b of the battery device 10; for example, the second direction Y can be the length direction a of the power-consuming device.

[0164] By adopting the above technical solution, the battery cell 11 can be arranged in the first receiving cavity 201 of the housing 2 as needed, which can improve the flexibility and convenience of the battery device 10 in the power-consuming device.

[0165] In some embodiments, please refer to FIG7, and in conjunction with other figures. The second direction Y is the travel direction c of the power-consuming device having the battery device 10, and N∈[2, 16].

[0166] Understandably, N can be 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, or 16.

[0167] It should be noted that the dimension of the battery device 10 along the traveling direction c of the power-consuming device is generally the length of the battery device 10, then the second direction Y is generally the length of the battery device 10, and the third direction X is generally the width of the battery device 10.

[0168] This configuration results in a smaller number of battery cells 11 in the battery cell assembly 1. This allows for greater flexibility in the arrangement of the battery cells 11 within the electrical device.

[0169] In some embodiments, please refer to Figures 7 and 8 together, and in conjunction with other figures. The second direction Y is the travel direction c of the electrical device having the battery device 10, and in the second direction Y, the minimum gap between the electrode terminals 111 of two adjacent battery cells 11 is ≥2mm.

[0170] For ease of description, the minimum gap between the electrode terminals 111 of two adjacent battery cells 11 is defined as the first gap H1 in the second direction Y.

[0171] For ease of description, in the second direction Y, two adjacent battery cells 11 are defined as the first battery cell 11 and the second battery cell 11, respectively. In the second direction Y, the gap between the electrode terminal 111 of the first battery cell 11 near the second battery cell 11 and the electrode terminal 111 of the second battery cell 11 near the first battery cell 11 is the aforementioned first gap H1.

[0172] The first gap H1 ≥ 2mm, specifically it can be 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, etc.

[0173] By adopting the above technical solution, the first gap H1 between two adjacent battery cells 11 in the second direction Y can be used to arrange the separator 213, insulating glue, busbar 3, etc., so that in the walking direction c of the power device, the separator 213, etc. can provide a certain buffer protection for the two adjacent battery cells 11.

[0174] In some embodiments, please refer to FIG12, and in conjunction with other figures. The third direction X is the walking direction c of the power-consuming device having the battery device 10, and N∈[2, 30].

[0175] Understandably, N can be 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29 or 30.

[0176] It should be noted that the dimension of the battery device 10 along the traveling direction c of the power-consuming device is generally the length of the battery device 10, then the third direction X is generally the length of the battery device 10, and the second direction Y is generally the width of the battery device 10.

[0177] This configuration results in a larger number of battery cells 11 in the battery cell assembly 1. This allows for greater flexibility in the arrangement of the battery cells 11 within the electrical device.

[0178] In some embodiments, please refer to Figures 12 and 13 together, and in conjunction with other figures. Figure 13 is an enlarged view of point C in Figure 12. The third direction X is the travel direction c of the electrical device having the battery device 10, N≥2, and in the third direction X, the gap between the electrode terminals 111 of two adjacent battery cells 11 at the same end of the second direction Y is ≥5mm.

[0179] For ease of description, the gap between the electrode terminals 111 of two adjacent battery cells 11 at the same end in the second direction Y is defined as the second gap H2 in the third direction X.

[0180] The second gap H2 is ≥ 5mm, and can specifically be 5mm, 5.1mm, 5.2mm, 5.3mm, 5.4mm, 5.5mm, 5.6mm, 5.7mm, 5.8mm, 5.9mm, 6mm, 6.1mm, 6.2mm, 6.3mm, 6.4mm, 6.5mm, 6.6mm, 6.7mm, 6.8mm, 6.9mm, 7mm, etc.

[0181] It should be noted that the surface of the battery cell 11 in the third direction X is generally the surface with the largest area of ​​the battery cell 11, i.e., the large surface.

[0182] By adopting the above technical solution, in the third direction X, a separator 213, insulating glue, etc. can be arranged between two adjacent battery cells 11, so that in the walking direction c of the electrical device, the second gap H2 and the separator 213 therein can provide a large degree of buffer protection for the battery cells 11.

[0183] In some embodiments, please refer to Figures 5 to 11 together, and in conjunction with other figures. Each battery cell 11 has a first surface 101 at both opposite ends along the second direction Y, and electrode terminals 111 extend from the first surface 101. Each battery cell 11 has a second surface 102 at both opposite sides along the third direction X, and the area of ​​the first surface 101 is smaller than the area of ​​the second surface 102.

[0184] Understandably, each battery cell 11 has electrode terminals 111 at both opposite ends along the second direction Y. The cell body 112 of the battery cell 11 has a first surface 101 at both opposite ends along the second direction Y; that is, the outer casing 1121 has a first surface 101 at both opposite ends along the second direction Y. The electrode terminals 111 extend from the first surface 101. Each cell body 112 has a second surface 102 at both opposite sides along the third direction X; that is, the outer casing 1121 has a second surface 102 at both opposite sides along the third direction X. The first surface 101 and the second surface 102 are both outer surfaces of the cell body 112, which are also outer surfaces of the outer casing 1121.

[0185] By making the area of ​​the first surface 101 smaller than the area of ​​the second surface 102, the maximum dimension of the cell body 112 along the second direction Y is greater than the maximum dimension of the cell body 112 along the third direction X. Consequently, the maximum dimension of the battery cell 11 along the second direction Y (i.e., the second dimension L2) is greater than the maximum dimension of the battery cell 11 along the third direction X (i.e., the first dimension L1). In other words, the length of the battery cell 11 is greater than the thickness of the battery cell 11. This configuration allows the battery cell 11 to have better heat dissipation capabilities, which helps to reduce the temperature of the battery cell 11.

[0186] In some embodiments, please refer to Figures 5 through 9 together with other figures. The first dimension L1 ∈ [10 mm, 45 mm].

[0187] Specifically, 10mm ≤ first dimension L1 ≤ 45mm, and the first dimension L1 can be 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, etc.

[0188] This configuration allows the battery cell 11 to have a suitable size along the third direction X. This design, on the one hand, allows the battery cell 11 to have better heat dissipation capabilities due to its size design along the third direction X, thereby keeping the temperature of the battery cell 11 within an optimal range and extending the lifespan of the battery device 10. On the other hand, given that the maximum dimension (i.e., the fourth dimension L4) of the first inner wall 2011 along the third direction X is predetermined, the battery cell 11 has a more suitable dimension along the third direction X, allowing the battery cell assembly 1 to have a more suitable number of battery cells 11, i.e., the value of N is more suitable. This allows the battery cell assembly 1 to have higher packing efficiency in the third direction X. For example, it can save, but is not limited to, components between adjacent battery cells 11 along the third direction X, save the outer casing 1121 at opposite ends of the battery cells 11 along the third direction X, and reduce space waste caused by the arrangement tolerance between adjacent battery cells 11. This helps the battery cell assembly 1 to fully utilize the first receiving cavity 201 of the housing 2 in the third direction X, which helps to improve the space utilization of the battery device 10 and improve the energy density of the battery device 10. Therefore, by adopting the above technical solution, it helps to keep the temperature and energy density of the battery device 10 within an optimal range.

[0189] In some embodiments, please refer to Figures 5 through 9 together with other figures. The first dimension L1 ∈ [15mm, 30mm].

[0190] Specifically, 15mm ≤ first dimension L1 ≤ 30mm, and the first dimension L1 can be 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, etc.

[0191] By adopting the above technical solution, the battery cell 11 has a more suitable size along the third direction X. This allows the battery cell 11 to have better heat dissipation capabilities, keeping its temperature within an optimal range. Furthermore, given a predetermined maximum dimension (i.e., the fourth dimension L4) of the first inner wall 2011 along the third direction X, the value of N can be within a suitable range. This allows the battery cell assembly 1 to have a more suitable packing efficiency along the third direction X, enabling the battery cell assembly 1 to fully utilize the first receiving cavity 201 of the housing 2 along the third direction X, thus improving the space utilization of the battery device 10 and increasing its energy density. Therefore, by adopting the above technical solution, the temperature and energy density of the battery device 10 can both be kept within an optimal range.

[0192] In some embodiments, please refer to Figures 5 to 11 together, and in conjunction with other figures. Each battery cell 11 has a third surface 103 at both opposite ends along the first direction Z, and the area of ​​the second surface 102 is larger than the area of ​​the third surface 103.

[0193] The single body 112 has a third surface 103 at both ends along the first direction Z, that is, the outer shell 1121 has a third surface 103 at both ends along the first direction Z. The third surface 103 is the outer surface of the single body 112, which is also the outer surface of the outer shell 1121.

[0194] By making the area of ​​the second surface 102 larger than the area of ​​the third surface 103, the maximum dimension of the battery cell 112 along the first direction Z is greater than the maximum dimension of the battery cell 112 along the third direction X. That is, the third dimension L3 mentioned below is greater than the first dimension L1, meaning the width of the battery cell 11 is greater than the thickness of the battery cell 11. This configuration allows the battery cell 11 to have better heat dissipation capabilities, thereby reducing the maximum temperature of the battery cell 11.

[0195] As an example, as shown in Figure 5 and in conjunction with other figures, the third surface 103 is larger than the first surface 101. Based on this, the maximum dimension of the cell body 112 along the second direction Y is greater than the maximum dimension of the battery cell 11 along the first direction Z (i.e., the third dimension L3), and the maximum dimension of the battery cell 11 along the first direction Z is greater than the maximum dimension of the battery cell 11 along the third direction X (i.e., the first dimension L1). That is, the length of the battery cell 11 is greater than the width of the battery cell 11, and the width of the battery cell 11 is greater than the thickness of the battery cell 11.

[0196] In some embodiments, please refer to Figures 5, 10 and 11 together, and in conjunction with other figures. The maximum dimension of the battery cell 11 along the first direction Z is the third dimension L3, where the third dimension L3 ∈ [60 mm, 160 mm].

[0197] Among them, the maximum dimension of the battery cell 11 along the first direction Z refers to the maximum dimension of the main body 112 of the battery cell 11 along the first direction Z, which is also the maximum dimension of the outer casing 1121 along the first direction Z, and is the third dimension L3.

[0198] Specifically, 60mm ≤ third dimension L3 ≤ 160mm, and the third dimension L3 can be 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, etc.

[0199] By adopting the above technical solution, the battery cell 11 has a suitable maximum size in the first direction Z, which helps to give the battery cell 11 better heat dissipation capabilities and reduce the temperature of the battery cell 11. Furthermore, this configuration makes the battery cell 11 a short-blade battery.

[0200] In some embodiments, please refer to Figures 5, 10, and 11 together, and in conjunction with other figures. The third dimension L3 ∈ [80 mm, 130 mm].

[0201] Specifically, 80mm ≤ third dimension L3 ≤ 130mm, and the third dimension L3 can be 80mm, 85mm, 90mm, 95mm, 100mm, 105mm, 110mm, 115mm, 120mm, 125mm, 130mm, etc.

[0202] By adopting the above technical solution, the battery cell 11 has a more suitable maximum size in the first direction Z, which helps the battery cell 11 to have better heat dissipation capacity and reduce the temperature of the battery cell 11.

[0203] In some embodiments, please refer to Figures 4, 6 to 8, 10 and 11 together, and in conjunction with other figures. The box 2 includes a box body 211 and a beam structure 212 disposed within the box body 211. The beam structure 212 divides the internal space of the box body 211 into a first receiving cavity 201 and a second receiving cavity 202. The first receiving cavity 201 and the second receiving cavity 202 are distributed along a third direction X, and a portion of the second inner wall 2012 is disposed on the beam structure 212.

[0204] Understandably, the second part 22 of the box 2 includes the box body 211 and the beam structure 212.

[0205] Understandably, the beam structure 212 and the battery cell assembly 1 are distributed along a third direction X, so that the beam structure 212 can resist the expansion of the battery cell 11 along the third direction X. The beam structure 212 may be, but is not limited to, an expansion beam.

[0206] Among them, the inner wall of the beam structure 212 along the third direction X near the battery cell assembly 1 is the second inner wall 2012. Specifically, the second sub-wall 20122 of the inner wall 212 along the third direction X near the battery cell assembly 1 is the second inner wall 2012.

[0207] The beam structure 212 can be a metal beam, such as, but not limited to, an aluminum alloy beam. The beam structure 212 can also be a non-metallic structure, such as, but not limited to, an epoxy resin fiberglass board.

[0208] The second receiving cavity 202 is a space for accommodating components such as the high-voltage box. Understandably, the first receiving cavity 201 is mainly used to accommodate the battery cell 11, while the second receiving cavity 202 is mainly used to accommodate other components besides the battery cell 11.

[0209] By adopting the above technical solution, the housing 2 of the battery device 10 can be divided into a first receiving cavity 201 and a second receiving cavity 202.

[0210] In some embodiments, please refer to Figures 4, 6 through 8, 10, and 11 together, and in conjunction with other figures. The housing 2 includes two beam structures 212 spaced apart within the housing body 211 along a third direction X. The two beam structures 212 and the housing body 211 enclose a first receiving cavity 201 and two second receiving cavities 202. Along the third direction X, the first receiving cavity 201 is located between the two second receiving cavities 202.

[0211] Understandably, two beam structures 212 are spaced apart within the box body 211 along a third direction X, and the two beam structures 212 and the box body 211 together enclose a first receiving cavity 201. Furthermore, each beam structure 212 and the box body 211 also encloses a second receiving cavity 202.

[0212] The two second sub-walls 20122 of the second inner wall 2012 are respectively provided on the two beam structures 212, and the two first sub-walls 20121 of the second inner wall 2012 are respectively provided on the box body 211.

[0213] By adopting the above technical solution, multiple battery cell modules 1 are all disposed within the first receiving cavity 201 and are positioned between two beam structures 212 along the third direction X. In this way, the two beam structures 212 can resist the expansion of the battery cells 11 in the third direction X.

[0214] In some embodiments, please refer to Figures 5, 10, and 11 together, and in conjunction with other figures. Each battery cell 11 has at least one set of electrode terminals 111 at both opposite ends in the second direction Y. Each set of electrode terminals 111 includes a positive electrode terminal 111a and a negative electrode terminal 111b spaced apart along the first direction Z.

[0215] Understandably, each end of the battery cell 11 in the second direction Y is provided with a plurality of electrode terminals 111, and the plurality of electrode terminals 111 at each end of the battery cell 11 in the second direction Y are distributed at intervals along the first direction Z. Furthermore, in each end of the battery cell 11 in the second direction Y, the plurality of electrode terminals 111 are grouped in pairs and have different polarities.

[0216] Understandably, the battery cell 11 has at least one set of electrode terminals 111 at one end along the second direction Y, and at least one set of electrode terminals 111 is also provided at the other end along the second direction Y. Each set of electrode terminals 111 includes two electrode terminals 111 spaced apart along the first direction Z and having different polarities. That is, each set of electrode terminals 111 includes a positive electrode terminal 111a and a negative electrode terminal 111b spaced apart along the first direction Z.

[0217] By providing at least one set of electrode terminals 111 with different polarities at each end of the battery cell 11 along the second direction Y, the average current path of the battery cell 11 can be effectively shortened, thereby reducing the internal resistance of the battery cell 11, reducing the heat generation of the battery cell 11, and thus reducing the temperature of the battery cell 11.

[0218] As an example, Figures 5, 10, 11, and 14 are shown, in conjunction with other figures. Figure 14 is a perspective view of the multiple battery cell assemblies 1 and the busbar component 3 of the battery device 10 shown in Figure 3. Each battery cell 11 has a set of electrode terminals 111 at each end along the second direction Y. Each set of electrode terminals 111 includes positive electrode terminals 111a and negative electrode terminals 111b spaced apart along the first direction Z.

[0219] As shown in Figure 14, and in conjunction with other accompanying figures, multiple battery cell assemblies 1 are designated as the first battery cell assembly 1, the second battery cell assembly 1, the third battery cell assembly 1, ... the penultimate battery cell assembly 1, and the last battery cell assembly 1. As an example, in each battery cell assembly 1, the terminal electrodes 111 of each battery cell 11 along the second direction Y are connected in series via a busbar 3, so that each battery cell assembly 1 has two total positive and two total negative electrodes. The two total positive electrodes of the first battery cell assembly 1 can be connected to form the total positive electrode of the entire assembly of multiple battery cell assemblies 1. The two total negative electrodes of the first battery cell assembly 1 can be connected to the two total positive electrodes of the second battery cell assembly 1 via the busbar 3, the two total negative electrodes of the second battery cell assembly 1 can be connected to the two total positive electrodes of the third battery cell assembly 1 via the busbar 3, and so on. The two total negative electrodes of the penultimate battery cell assembly 1 can be connected to the two total positive electrodes of the last battery cell assembly 1 via the busbar 3, thus connecting the first battery cell assembly 1, the second battery cell assembly 1, the third battery cell assembly 1, ... the penultimate battery cell assembly 1, and the last battery cell assembly 1 in series. The two negative terminals of the last battery cell assembly 1 are connected to serve as the total negative terminal of the whole assembly consisting of multiple battery cell assemblies 1.

[0220] In some embodiments, please refer to Figures 5, 10, and 11 together, and in conjunction with other figures. The battery cell 11 also includes a pressure relief mechanism 113.

[0221] The pressure relief mechanism 113 is a mechanism that can release the internal pressure of the battery cell 11 when the internal pressure or temperature reaches a threshold. For example, when the battery cell 11 is working normally, the gas pressure inside the battery cell 11 is less than the opening pressure value of the pressure relief mechanism 113, and the pressure relief mechanism 113 is in the closed state, and the gas inside the battery cell 11 is not connected to the external gas. When the battery cell 11 experiences thermal runaway under the influence of internal and external factors such as overcharging, over-discharging, overheating, and mechanical collision, a large amount of high-temperature and high-pressure gas, flames, and other high-temperature and high-pressure media are generated inside the battery cell 11, causing the internal pressure of the battery cell 11 to exceed the opening pressure value of the pressure relief mechanism 113. The pressure relief mechanism 113 changes from the closed state to the open state, and the high-temperature and high-pressure gas, flames, and other high-temperature and high-pressure media inside the battery cell 11 can be discharged to the outside of the battery cell 11 through the pressure relief mechanism 113.

[0222] The pressure relief mechanism 113 is disposed on the main body 112 of the battery cell 11. Specifically, the pressure relief mechanism 113 can be disposed on the outer casing 1121 of the battery cell 11. The pressure relief mechanism 113 can be a weak structure disposed on the outer casing 1121 of the battery cell 11; alternatively, the pressure relief mechanism 113 can also be a pressure valve or similar structure. When the pressure relief mechanism 113 is a weak structure disposed on the outer casing 1121, its structural strength is lower than that of other locations on the outer casing 1121. Thus, in the event of thermal runaway of the battery cell 11, the high-temperature and high-pressure gas, flame, or other high-temperature and high-pressure medium generated by the battery cell 11 can break through the pressure relief mechanism 113 and be released outside the battery cell 11.

[0223] As shown in Figure 5, the pressure relief mechanism 113 can be disposed on the end cap 11212 of the outer casing 1121. The pressure relief mechanism 113 can also be disposed on the housing 11211 of the outer casing 1121.

[0224] In some possible designs, the pressure relief mechanism 113 can be integrally connected to the housing 1121, and a breakage mark is provided between the pressure relief mechanism 113 and the housing 1121, which can be a serration or a break line, etc. Alternatively, the pressure relief mechanism 113 can be separately disposed on the housing 1121.

[0225] In some embodiments, please refer to Figures 5, 10, and 11 together, and in conjunction with other figures. The battery cell 11 is provided with the aforementioned pressure relief mechanism 113 at at least one end along the second direction Y, and the pressure relief mechanism 113 is distributed at intervals from the electrode terminals 111.

[0226] Understandably, the housing 1121 is provided with a pressure relief mechanism 113 at at least one end along the second direction Y.

[0227] By placing the pressure relief mechanism 113 at at least one end of the battery cell 11 along the second direction Y, the first receiving cavity 201 of the housing 2 can be effectively saved, thereby helping to improve the space utilization and energy density of the battery device 10. Furthermore, this facilitates the arrangement of thermal management components 2111 at opposite ends of the battery cell assembly 1 along the first direction Z, and on this basis, the pressure relief mechanism 113 can effectively achieve the pressure relief effect of the battery cell 11.

[0228] In some embodiments, in the second direction Y, insulating adhesive is provided between the battery cells 11 of two adjacent battery cell assemblies 1.

[0229] Understandably, insulating adhesive can be provided between two adjacent battery cells 11 along the second direction Y.

[0230] Insulating adhesive may be provided between the outer casings 1121 of two adjacent battery cells 11 along the second direction Y. Insulating adhesive may also be provided between the electrode terminals 111 of two adjacent battery cells 11 along the second direction Y.

[0231] In some embodiments, N≥2, and on a third-party X, an insulating adhesive is provided between two adjacent battery cells 11.

[0232] Understandably, insulating adhesive may be provided between two adjacent battery cells 11 along the third direction X.

[0233] Among them, insulating adhesive refers to an adhesive layer with insulating properties, which may be, but is not limited to, structural adhesive, double-sided adhesive, etc.

[0234] By providing insulating adhesive between two adjacent battery cells 11, insulation can be achieved between them, reducing adverse effects and allowing the battery assembly 10 to perform optimally. Furthermore, the insulating adhesive simplifies the fixing of multiple battery cell assemblies 10, facilitating assembly and improving production efficiency. Additionally, the insulating adhesive provides protection during thermal runaway of the battery cells 11, mitigating high-voltage arcing caused by particulate matter ejected from the cells.

[0235] In some embodiments, insulating adhesive may be provided between the first inner wall 2011 and the adjacent battery cell 11, and between the second inner wall 2012 and the adjacent battery cell 11, to provide insulation protection for the battery cell 11.

[0236] In some embodiments, please refer to Figures 5, 10, and 11 together, and in conjunction with other figures. A pressure relief mechanism 113 is provided on the battery cell 11, and the pressure relief mechanism 113 is spaced apart from the electrode terminals 111. At least a portion of the insulating adhesive is provided on the electrode terminals 111, avoiding the pressure relief mechanism 113.

[0237] By applying at least a portion of the insulating adhesive to the electrode terminals 111, insulation and fixation can be achieved between adjacent battery cells 11. Furthermore, the insulating adhesive avoids the pressure relief mechanism 113, facilitating the pressure relief mechanism's function.

[0238] In some embodiments, please refer to Figures 5, 10, and 11 together, and in conjunction with other figures. The pressure relief mechanism 113 and the electrode terminals 111 are spaced apart along a first direction Z. In the first direction Z, insulating adhesive extends beyond the electrode terminals 111 and is spaced apart from the pressure relief mechanism 113.

[0239] Understandably, at least a portion of the insulating adhesive is disposed on the electrode terminal 111, the insulating adhesive extends beyond the electrode terminal 111 along the first direction Z, and the insulating adhesive and the pressure relief mechanism 113 are spaced apart along the first direction Z.

[0240] This arrangement allows the insulating adhesive to be placed on the electrode terminal 111 while avoiding the pressure relief mechanism 113, thus enabling the insulating adhesive to achieve functions such as insulation protection, fixation, and thermal runaway protection, and to a certain extent, ensure the function of the pressure relief mechanism 113.

[0241] As an example, as shown in Figures 5, 10, and 11, and in conjunction with other figures, electrode terminals 111 are spaced apart between the pressure relief mechanism 113 and the first inner wall 2011 in the first direction Z. Insulating adhesive is applied to the first inner wall 2011, the outer casing 1121, and the electrode terminals 111. The insulating adhesive extends beyond the electrode terminals 111 towards the pressure relief mechanism 113 in the first direction Z, and is spaced apart from the pressure relief mechanism 113 in the first direction Z.

[0242] Understandably, the height of the insulating adhesive in the first direction Z is lower than the distance between the pressure relief mechanism 113 and the first inner wall 2011 in the first direction Z, so that the insulating adhesive can fill between two adjacent battery cells 11 and avoid the pressure relief mechanism 113.

[0243] In some embodiments, please refer to Figures 4 to 11 together, and in conjunction with other figures. In the second direction Y, a separator 213 is provided between the battery cells 11 of two adjacent battery cell assemblies 1.

[0244] Understandably, a separator 213 may be provided between two adjacent battery cells 11 along the second direction Y. Specifically, a separator 213 is provided between the electrode terminals 111 of two adjacent battery cells 11 along the second direction Y, and the separator 213 separates the electrode terminals 111 of the two adjacent battery cells 11 along the second direction Y.

[0245] In some embodiments, please refer to Figures 4 to 11 together, and in conjunction with other figures. N≥2, and in the third direction X, a separator 213 is provided between two adjacent battery cells 11.

[0246] Understandably, a separator 213 may be provided between two adjacent battery cells 11 along the third direction X. Specifically, a separator 213 may be provided between the outer casing 1121 of two adjacent battery cells 11 along the third direction X, and a separator 213 may be provided between the electrode terminals 111 of two adjacent battery cells 11 along the third direction X. The separator 213 separates the two adjacent battery cells 11 along the third direction X.

[0247] The battery cell 11 can be separated by a separator 213. On the one hand, the separator 213 can separate the high voltage between two adjacent battery cells 11, reducing the adverse effects between them and allowing the battery device 10 to perform at its best. On the other hand, it can improve the overall strength of the battery array and reduce the adverse effects of external factors such as vibration on the battery cell assembly 1, thus effectively enhancing the adaptability of the battery device 10.

[0248] In some embodiments, a separator 213 may be provided between the second inner wall 2012 and the adjacent battery cell 11, so that the separator 213 separates the electrode terminals 111 of the battery cell 11 and the second inner wall 2012. In this way, the high voltage of the battery cell 11 can also be separated from the housing 2, improving the reliability of the battery device 10 and increasing the overall strength of the battery device 10.

[0249] The partition component 213 may be, but is not limited to, at least one of a heat-conducting component, a buffer component, a partition plate, or a partition beam.

[0250] Specifically, the separator 213 is configured as at least one of a heat-conducting component, a buffer component, a separator plate, and a separator beam. Based on separating two adjacent battery cells 11 or separating the battery cells 11 and the second inner wall 2012, the separator 213 can be configured according to different needs to meet the corresponding usage requirements of the battery array.

[0251] When the separator 213 is a heat-conducting component, the separator is disposed between two adjacent battery cells 11 or between the second inner wall 2012 and an adjacent battery cell 11. It can conduct heat out of the battery cell 11, which helps the battery cell 11 to dissipate heat and thus helps to reduce the maximum temperature of the battery cell 11.

[0252] When the separator 213 is a buffer, it is disposed between two adjacent battery cells 11 or between the second inner wall 2012 and an adjacent battery cell 11. On one hand, the buffer can absorb tolerances generated during manufacturing between two adjacent battery cells 11, or between the second inner wall 2012 and the battery cell 11, to ensure effective installation of the battery cells 11. On the other hand, the buffer can provide cushioning between two adjacent battery cells 11, or between the second inner wall 2012 and the battery cell 11, reducing the possibility of damage to the battery cells 11 due to compression. Furthermore, the buffer can absorb the expansion of the battery cells 11.

[0253] When the separating component 213 is a separating plate, the separating plate is disposed between two adjacent battery cells 11 or between the second inner wall 2012 and the adjacent battery cells 11. By using the separating plate to separate two adjacent battery cells 11 or the second inner wall 2012 and the adjacent battery cells 11, the situation of the battery cells 11 being crushed and damaged can be reduced.

[0254] When the separating component 213 is a separating beam, the separating beam is set between two adjacent battery cells 11 or between the second inner wall 2012 and the adjacent battery cell 11. By using the separating beam to separate two adjacent battery cells 11 or the second inner wall 2012 and the adjacent battery cell 11, the situation of the battery cell 11 being crushed and damaged can be reduced.

[0255] In some embodiments, when an insulating adhesive is provided between two adjacent battery cells 11 or between the second inner wall 2012 and an adjacent battery cell 11, the insulating adhesive can be bonded and fixed to the separator 213.

[0256] In some embodiments, at least one end of the electrode terminal 111 along the second direction Y is provided with a pressure relief mechanism 113. The pressure relief mechanism 113 and the separating member 213 are spaced apart and arranged opposite to each other, so that the separating member 213 can provide a certain degree of protection against thermal runaway of the battery cell 11.

[0257] In some embodiments, please refer to Figures 4, 6, 10, and 11 together with other figures. The housing 2 includes a thermal management component 2111 disposed at at least one end of the battery cell assembly 1 along a first direction Z. The thermal management component 2111 is connected to the battery cell 11 to regulate the temperature of the battery cell 11.

[0258] The thermal management component 2111 refers to a component capable of thermal management of the battery cell assembly 1. The thermal management component 2111 may be, but is not limited to, a water-cooled plate, a water-cooled pipe, etc. The thermal management component 2111 may be provided with a flow channel for circulating heat exchange medium. The heat exchange medium may be, but is not limited to, water, oil, etc., and the heat exchange medium can perform cooling or heating management of the battery cell assembly 1.

[0259] By providing a thermal management component 2111 at at least one end of the battery cell assembly 1 along the first direction Z, the thermal management component 2111 at at least one end of the battery cell assembly 1 along the first direction Z can perform thermal management on the battery cell assembly 1.

[0260] In some embodiments, please refer to Figures 4, 6, 10, and 11 together, and in conjunction with other figures. Thermal management components 2111 are provided at both opposite ends of the battery cell assembly 1 along the first direction Z. This improves the thermal management efficiency of the battery cell assembly 1, thereby helping to reduce the temperature of the battery cell 11. Furthermore, it helps to improve the temperature uniformity of the multiple battery cell assemblies 1, thereby helping to extend the service life of the battery device 10.

[0261] It should be further noted that, of the two thermal management components 2111, one thermal management component 2111 is disposed on the first part 21, and the other thermal management component 2111 is disposed on the second part 22. The first inner wall 2011 may be disposed on the thermal management component 2111.

[0262] In some embodiments, the thermal management component 2111 may be provided with an inlet and an outlet. The heat exchange medium can enter the flow channel of the thermal management component 2111 through the inlet and then flow out from the outlet to achieve circulation.

[0263] In some embodiments, the inlet and outlet distribution directions of one thermal management component 2111 are approximately opposite to those of the other thermal management component 2111. This arrangement can effectively improve the heat exchange efficiency between the heat exchange medium within the thermal management component 2111 and the battery cell assembly 1, thereby contributing to improved thermal management efficiency of the battery cell assembly 1, which helps to reduce the temperature of the battery cell 11, and also helps to improve the temperature uniformity of multiple battery cell assemblies 1.

[0264] The beam structure 212 may be provided with openings for corresponding communication with the inlet and outlet of the heat management component 2111, so that the external heat exchange medium can enter and exit the heat management component 2111 through the beam structure 212.

[0265] Please refer to Figure 1 and other accompanying drawings. The power device provided in this embodiment includes a battery device 10. The battery device 10 in this embodiment is the same as the battery device 10 in the above embodiments; please refer to the relevant descriptions of the battery device 10 in the above embodiments for details, which will not be repeated here.

[0266] The electrical device provided in this application embodiment, by employing the battery device 10 mentioned above, enables the battery device 10 to balance energy density and temperature, thereby improving the performance and reliability of the battery device 10, which in turn helps to improve the performance and reliability of the electrical device.

[0267] As one embodiment of this application, as shown in Figures 4 to 11, the battery device 10 includes a housing 2 and a plurality of battery cell assemblies 1. The housing 2 has a first receiving cavity 201, which has a first inner wall 2011 and a second inner wall 2012. The second inner wall 2012 is connected to the outer periphery of the first inner wall 2011. On a projection plane perpendicular to the first direction Z, the area of ​​the orthographic projection of the first inner wall 2011 is a first area S. The plurality of battery cell assemblies 1 are arranged within the first receiving cavity 201, along the second direction Y, and the battery cell assemblies 1 and the first inner wall 2011 are arranged along the first direction Z. The battery cell assembly 1 includes N battery cells 11 arranged along a third direction X. The maximum dimension of the battery cell 11 along the third direction X is a first dimension L1, and the maximum dimension of the battery cell 11 along the second direction Y is a second dimension L2, where the second dimension L2 ∈ [200mm, 400mm]. Each battery cell 11 has electrode terminals 111 at both opposite ends along the second direction Y. Wherein, N ≥ 1, N is a positive integer, and the first area S / (N * first dimension L1 * second dimension L2) ∈ [3, 8]. Wherein, the first direction Z is perpendicular to the second direction Y, the first direction Z is perpendicular to the third direction X, and the second direction Y is perpendicular to the third direction X.

[0268] The above are merely optional embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A battery device, wherein, include: The box body has a first receiving cavity; the first receiving cavity has a first inner wall and a second inner wall connected to the outer periphery of the first inner wall; on a projection plane perpendicular to the first direction, the area of ​​the orthographic projection of the first inner wall is the first area; Multiple battery cell assemblies are arranged in the first receiving cavity along the second direction and are arranged with the first inner wall along the first direction; the battery cell assembly includes N battery cells arranged along the third direction, the maximum size of the battery cell along the third direction is a first size, the maximum size of the battery cell along the second direction is a second size, and at least one end of the battery cell along the second direction is provided with an electrode terminal. Where N≥1, N is a positive integer, and the first area / (N*first dimension*second dimension)∈[3,8]; the first direction, the second direction and the third direction are mutually perpendicular.

2. The battery device according to claim 1, wherein, The second dimension is ≥200mm.

3. The battery device according to claim 1 or 2, wherein, The second dimension is ≤400mm.

4. The battery device according to any one of claims 1-3, wherein, The battery device has a length direction and a width direction, and the length of the battery device is greater than the width of the battery device; the second direction is either the length direction of the battery device or the width direction of the battery device.

5. The battery device according to any one of claims 1-4, wherein, The second direction is the walking direction of the power-consuming device having the battery device; or, the third direction is the walking direction of the power-consuming device having the battery device.

6. The battery device according to claim 5, wherein, The second direction is the walking direction of the power-consuming device having the battery device, and N∈[2,16].

7. The battery device according to claim 5 or 6, wherein, The second direction is the walking direction of the electrical device having the battery device, and in the second direction, the minimum gap between the electrode terminals of two adjacent battery cells is ≥2mm.

8. The battery device according to claim 5, wherein, The third direction is the walking direction of the power-consuming device with the battery device, and N∈[2,30].

9. The battery device according to claim 5 or 8, wherein, The third direction is the walking direction of the power-consuming device with the battery device, N≥2, and in the third direction, the gap between the electrode terminals of two adjacent battery cells at the same end of the second direction is ≥5mm.

10. The battery device according to any one of claims 1-9, wherein, The battery cell has a first surface at both ends along the second direction, and the electrode terminal extends out of the first surface; The battery cell has a second surface on each of its two opposite sides along the third direction, and the area of ​​the first surface is smaller than the area of ​​the second surface.

11. The battery device according to claim 10, wherein, The first dimension is [10mm, 45mm].

12. The battery device according to claim 11, wherein, The first dimension is [15mm, 30mm].

13. The battery device according to any one of claims 10-12, wherein, The battery cell has a third surface at each of its two opposite ends along the first direction, and the area of ​​the second surface is larger than the area of ​​the third surface.

14. The battery device according to claim 13, wherein, The maximum dimension of the battery cell along the first direction is the third dimension, and the third dimension is [60mm, 160mm].

15. The battery device according to claim 14, wherein, The third dimension is [80mm, 130mm].

16. The battery device according to any one of claims 1-15, wherein, The box includes a box body and a beam structure disposed within the box body. The beam structure divides the internal space of the box body into a first accommodating cavity and a second accommodating cavity. The first accommodating cavity and the second accommodating cavity are distributed along the third direction, and a portion of the second inner wall is disposed on the beam structure.

17. The battery device according to claim 16, wherein, The box body includes two beam structures spaced apart within the box body along the third direction, the two beam structures and the box body enclosing to form a first receiving cavity and two second receiving cavities; in the third direction, the first receiving cavity is located between the two second receiving cavities.

18. The battery device according to any one of claims 1-17, wherein, The battery cell has at least one set of electrode terminals at each of its opposite ends in the second direction, and each set of electrode terminals includes positive electrode terminals and negative electrode terminals that are spaced apart along the first direction.

19. The battery device according to any one of claims 1-18, wherein, The battery cell is provided with a pressure relief mechanism at least one end along the second direction, which is spaced apart from the electrode terminals.

20. The battery device according to any one of claims 1-19, wherein, In the second direction, an insulating adhesive is provided between the battery cells of two adjacent battery cell assemblies; And / or, N≥2, and in the third direction, insulating adhesive is provided between two adjacent battery cells.

21. The battery device according to claim 20, wherein, The battery cell is provided with a pressure relief mechanism that is spaced apart from the electrode terminals, and at least a portion of the insulating adhesive is provided on the electrode terminals and avoids the pressure relief mechanism.

22. The battery device according to claim 21, wherein, The pressure relief mechanism and the electrode terminals are spaced apart along the first direction; in the first direction, the insulating adhesive extends beyond the electrode terminals and is spaced apart from the pressure relief mechanism.

23. The battery device according to any one of claims 1-22, wherein, In the second direction, a separator is provided between the battery cells of two adjacent battery cell assemblies; And / or, N≥2, and in the third direction, a separator is provided between two adjacent battery cells.

24. The battery device according to any one of claims 1-23, wherein, The housing includes a thermal management component disposed at at least one end of the battery cell assembly along the first direction, the thermal management component being connected to the battery cell to regulate the temperature of the battery cell.

25. An electrical appliance, wherein, Includes the battery device according to any one of claims 1-24.

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