Battery apparatus and electric apparatus

Abstract

The present application is applicable to the technical field of batteries, and provides a battery apparatus (10) and an electric apparatus, the battery apparatus (10) comprising a case body (2) and a battery cell array (1), wherein the case body (2) comprises two first inner walls (2111) opposite to each other along a first direction (Y), and the maximum distance between the two first inner walls (2111) along the first direction (Y) is a first size (L1); and the battery cell array (1) is disposed between the two first inner walls (2111), the battery cell array (1) comprises a plurality of battery cells (11) arranged in an array of M rows and N columns, and in the battery cell array (1), the battery cells (11) in each column are arranged along the first direction (Y), and the battery cells (11) in each row are arranged along a second direction (X), wherein the maximum size of the battery cells (11) along the first direction (Y) is a second size (L2), and an electrode terminal (111) is provided at at least one end of the battery cells (11) along the first direction (Y); M≥1, and N≥1, with both M and N being positive integers; the second size (L2)*(M) / the first size (L1)∈[0.846, 0.921); and the first direction (Y) intersects the second direction (X). In this way, the maximum temperature and energy density of the battery apparatus (10) can be within an optimal range.

Description

Battery devices and electrical appliances

[0001] Cross-referencing

[0002] This application claims priority to Chinese patent application No. 202510011841.0, 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, resulting in high energy density. However, this inevitably leads to very high maximum temperatures for the individual battery cells, impacting the battery's lifespan. In other cases, adjusting the cell arrangement within the casing can reduce the maximum temperature of the individual cells, extending the battery's lifespan. This, however, inevitably reduces space utilization, thus decreasing the battery's energy density. Consequently, it is difficult to simultaneously achieve optimal balance between maximum cell temperature and energy density in a power battery, making it challenging to keep both within their optimal ranges. 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 the maximum temperature of individual battery cells.

[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 enclosure includes two first inner walls disposed opposite each other along a first direction, and the maximum distance between the two first inner walls along the first direction is a first dimension.

[0010] A battery cell array is disposed between two first inner walls; the battery cell array includes multiple battery cells arranged in an array of M rows and N columns; in the battery cell array, each column of battery cells is arranged along a first direction, and each row of battery cells is arranged along a second direction; the maximum size of the battery cell along the first direction is the second size, and at least one end of the battery cell along the first direction is provided with an electrode terminal.

[0011] Where M≥1, N≥1, and M and N are both positive integers; second dimension * M / first dimension ∈ [0.846, 0.921]; the first direction intersects the second direction.

[0012] The battery device provided in this application includes a housing and an array of battery cells disposed within the housing. The battery cell array comprises multiple battery cells arranged in an M-row, N-column array. Each column of battery cells is arranged along a first direction, and the maximum dimension of the battery cell along the first direction (i.e., the second dimension) * the number of battery cells in each column (i.e., M) / the maximum dimension of the two first inner walls along the first direction (i.e., the first dimension) ∈ [0.846, 0.921]. This ensures that, given a predetermined maximum dimension of the two first inner walls along the first direction, each column of battery cells has a suitable number of battery cells, and each battery cell has a suitable maximum dimension in the first direction. This allows each column of battery cells to be arranged relatively compactly within the housing along the first direction. This configuration allows both the maximum temperature and energy density of the battery device to be within an optimal range. That is, the battery device has a higher energy density while maintaining a lower maximum temperature of the battery cells, thus enabling the battery device to combine the advantages of low maximum temperature of the battery cells and high energy density of the power battery.

[0013] In some embodiments, the second dimension * M / the first dimension ∈ [0.897, 0.921].

[0014] This configuration allows the battery device's maximum temperature and energy density to be within an optimal range.

[0015] In some embodiments, the second dimension is ≥200mm.

[0016] By adopting the above technical solution, the maximum dimension (i.e., the second dimension) of the battery cell in the first direction has a certain range of values. This has two advantages: First, it allows the battery cell to have a suitable flow path length, thus mitigating the problem of excessive heat generation caused by an excessively large flow path. This keeps the heat generation of the battery cell within an optimal range, resulting in a more favorable maximum temperature and extending the battery device's lifespan. Second, with the maximum dimensions of the two first inner walls along the first direction predetermined, each row of battery cells has a suitable number of cells, i.e., the value of M is more appropriate. This improves the grouping efficiency of each row of battery cells in the first direction, allowing the battery cell array to fully utilize the internal space of the housing in the first direction. This helps improve the space utilization rate of the battery device and ultimately increases its energy density.

[0017] In some embodiments, the second dimension is ≤400mm.

[0018] In some embodiments, M ≥ 3.

[0019] By setting M≥3, the maximum size of the battery cell in the first direction is not too large when the maximum size of the two first inner walls along the first direction is predetermined. This allows the battery cell to have a flow path of a suitable length, which can improve the problem of excessive heat generation caused by excessive flow path of the battery cell. This keeps the heat generation of the battery cell within an optimal range, thereby keeping the maximum temperature of the battery cell within an optimal range, which is beneficial to extending the service life of the battery device.

[0020] In some embodiments, M≤8.

[0021] This configuration ensures that, given a predetermined maximum dimension of the two first inner walls along the first direction, the maximum dimension of the individual battery cells in the first direction is neither too large nor too small, and the number of cells in each row is appropriate. This has two advantages: First, it allows the individual battery cells to have a suitable flow path length, mitigating the problem of excessive heat generation caused by excessively large flow paths. This keeps the heat generation of the individual cells within an optimal range, thus keeping the maximum temperature of the individual cells within an optimal range and extending the lifespan of the battery device. Second, it improves the grouping efficiency of each row of battery cells in the first direction, allowing the battery cell array to fully utilize the internal space of the housing in the first direction, improving the space utilization rate of the battery device and increasing its energy density.

[0022] 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 first direction is either the length direction of the battery device or the width direction of the battery device.

[0023] By adopting the above technical solution, the battery cell array can be arranged in the box as needed, which can improve the flexibility and convenience of arranging the battery cell array in the box.

[0024] In some embodiments, the first direction is the walking direction of the power-consuming device with a battery device; or, the second direction is the walking direction of the power-consuming device with a battery device.

[0025] By adopting the above technical solutions, the battery cell array can be arranged in the box as needed, which can improve the flexibility and convenience of battery device arrangement in power-consuming devices.

[0026] In some embodiments, the battery cell has a first surface at opposite ends along a first direction, and electrode terminals extend from the first surface;

[0027] The battery cell has a second surface on each side of the opposite sides along the second direction, and the area of ​​the first surface is smaller than the area of ​​the second surface.

[0028] 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 first direction is greater than the maximum dimension of the battery cell along the second direction. This, in turn, makes the maximum dimension of the battery cell along the first direction (i.e., the second dimension) greater than the maximum dimension of the battery cell along the second direction (i.e., the third dimension hereinafter). 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, thereby reducing the maximum temperature of the battery cell.

[0029] In some embodiments, the maximum dimension of the battery cell along the second direction is the third dimension, where the third dimension ∈ [10mm, 45mm].

[0030] This configuration allows the individual battery cells to have a suitable size along the second direction. On one hand, the size design of the battery cells along the second direction enables them to have better heat dissipation capabilities, thus keeping the maximum temperature of the individual cells within an optimal range and extending the lifespan of the battery device. On the other hand, given a predetermined maximum dimension between the two opposing inner walls of the housing along the second direction, the suitable size of the battery cells allows for a suitable number of cells per row, i.e., a suitable value for N. This ensures that each row of battery cells has a suitable packing efficiency in the second direction, allowing the battery cell array to fully utilize the internal space of the housing in the second direction, improving the space utilization of the battery device and thus increasing its energy density. Therefore, by adopting the above technical solution, it is possible to keep both the maximum temperature and energy density of the battery device within an optimal range.

[0031] In some embodiments, the third dimension ∈ [15mm, 30mm].

[0032] By adopting the above technical solution, the battery cells have a more suitable size along the second direction. This results in two advantages: firstly, the battery cells have better heat dissipation capabilities, keeping their maximum temperature within an optimal range; secondly, given a predetermined maximum dimension between the two opposing inner walls of the housing along the second direction, the value of N can be within a suitable range. This allows each row of battery cells to have a suitable packing efficiency in the second direction, enabling the battery cell array to fully utilize the internal space of the housing in the second direction, thus improving the space utilization rate of the battery device and increasing its energy density. Therefore, by adopting the above technical solution, both the maximum temperature and energy density of the battery device can be kept within an optimal range.

[0033] In some embodiments, the battery cell has a third surface at both ends along a third direction, the area of ​​the second surface is larger than the area of ​​the third surface, and the third direction intersects the first direction and the second direction respectively.

[0034] 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 third direction is greater than the maximum dimension of the battery cell along the second direction. In other words, the fourth dimension (described below) is greater than the third 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.

[0035] In some embodiments, the maximum dimension of a single battery cell along a third direction is a fourth dimension, where the fourth dimension ∈ [60mm, 160mm].

[0036] By adopting the above technical solution, the battery cell has a more suitable maximum size in the third direction, which helps to give the battery cell better heat dissipation capacity and reduce the maximum temperature of the battery cell.

[0037] In some embodiments, the fourth dimension ∈ [80mm, 130mm].

[0038] By adopting the above technical solution, the battery cell has a more suitable maximum size in the third direction, which helps to give the battery cell better heat dissipation capacity and reduce the maximum temperature of the battery cell.

[0039] In some embodiments, the housing includes two first walls disposed opposite to each other along a first direction, the first inner wall being the inner wall of the first wall, the first outer wall being the outer wall of the first wall, the maximum distance between the first outer walls of the two first walls along the first direction being a fifth dimension, and the second dimension * M / fifth dimension ∈ [0.815, 0.894].

[0040] By adopting the above technical solution, the battery cells have a suitable maximum size along the first direction, and each row of battery cells has a suitable number of cells. This ensures that the maximum temperature and energy density of the battery device are within an optimal range.

[0041] In some embodiments, the second dimension * M / the fifth dimension ∈ [0.864, 0.894].

[0042] By adopting the above technical solution, the battery cells have a suitable maximum size along the first direction, and each row of battery cells has a suitable number of cells. This ensures that the maximum temperature and energy density of the battery device are within an optimal range.

[0043] In some embodiments, each of the battery cells includes at least one set of electrode terminals at both ends in a first direction, and each set of electrode terminals includes positive electrode terminals and negative electrode terminals spaced apart along a third direction; the third direction intersects the first direction and the second direction, respectively.

[0044] By providing at least one set of electrode terminals with different polarities at each end of the battery cell along the first 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 maximum temperature of the battery cell.

[0045] In some embodiments, at least one end of a battery cell along a first direction includes a pressure relief mechanism spaced apart from the electrode terminals.

[0046] By placing the pressure relief mechanism at at least one end of the battery cell along the first direction, the internal space 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 array along a third direction, and on this basis, the pressure relief mechanism can effectively achieve the pressure relief effect of the battery cells.

[0047] In some embodiments, M≥2, and in each row of battery cells, insulating adhesive is provided between two adjacent battery cells;

[0048] And / or, N≥2, and in each row of battery cells, insulating glue is provided between two adjacent battery cells.

[0049] 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 the battery cell array, facilitating assembly and improving production efficiency. Furthermore, the insulating adhesive provides protection during thermal runaway of the battery cells, mitigating high-voltage arcing caused by particulate matter ejected from the cells.

[0050] 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.

[0051] 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.

[0052] In some embodiments, the pressure relief mechanism and the electrode terminals are spaced apart along a third direction; in the third direction, the insulating adhesive extends beyond the electrode terminals and is spaced apart from the pressure relief mechanism; the third direction intersects the first direction and the second direction, respectively.

[0053] 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.

[0054] In some embodiments, M≥2, and in each row of battery cells, a separator is provided between two adjacent battery cells;

[0055] And / or, N≥2, and in each row of battery cells, there is a separator between two adjacent battery cells.

[0056] By separating adjacent battery cells using a separator, the adverse effects between them can be reduced, allowing the battery device to perform at its best. Furthermore, this improves the overall strength of the battery cell array, reducing the negative impact of external factors such as vibration, thus effectively enhancing the adaptability of the battery device.

[0057] In some embodiments, the housing further includes a thermal management component disposed at at least one end of the battery cell array along a third direction. The thermal management component is connected to the battery cells to regulate the temperature of the battery cells. The third direction intersects the first direction and the second direction, respectively.

[0058] By providing thermal management components at at least one end of the battery cell array along a third direction, the thermal management components at at least one end of the battery cell array along a third direction can perform thermal management on the battery cell array.

[0059] Secondly, embodiments of this application provide an electrical device, including a battery device.

[0060] The electrical device provided in this application embodiment, by employing the battery device mentioned above, enables the battery device to balance energy density and the maximum temperature of individual battery cells, thereby improving the performance and reliability of the battery device, which in turn helps to improve the performance and reliability of the electrical device.

[0061] 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

[0062] 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.

[0063] Figure 1 is a schematic diagram of a vehicle provided in some embodiments of this application;

[0064] Figure 2 is an exploded view of a battery device provided in some embodiments of this application;

[0065] Figure 3 is a schematic diagram of a battery device provided in some other embodiments of this application;

[0066] Figure 4 is an exploded view of the battery device shown in Figure 3;

[0067] Figure 5 is a three-dimensional structural diagram of a battery cell of a battery device provided in some embodiments of this application;

[0068] Figure 6 is a partial schematic diagram of the battery device housing shown in Figure 3;

[0069] Figure 7 is a partial schematic diagram of the battery device shown in Figure 3;

[0070] Figure 8 is an enlarged view of point A in Figure 7;

[0071] Figure 9 is a cross-sectional view of Figure 3 along BB;

[0072] Figure 10 is a magnified view of a portion of Figure 9;

[0073] Figure 11 is a partial schematic diagram of a battery device provided in some embodiments of this application;

[0074] Figure 12 is a three-dimensional structural diagram of the battery cell array of the battery device provided in Figure 3.

[0075] In the figures, the following reference numerals are used: 3000 - Vehicle; 3100 - Controller; 3200 - Motor; 10 - Battery device; 1 - Battery cell array; 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; 21 - First part; 22 - Second part; 211 - First wall ; 2111-First inner wall; 2112-First outer wall; 212-Thermal management component; 2121-Third inner wall; 213-Separation component; 214-Second wall; 2141-Second inner wall; 2142-Second outer wall; 3-Busting component; L1-First dimension; L2-Second dimension; L3-Third dimension; L4-Fourth dimension; L5-Fifth dimension; L6-Sixth dimension; L7-Seventh dimension; a-Length direction; b-Width direction; c-Travel direction; Y-First direction; X-Second direction; Z-Third direction. Detailed Implementation

[0076] 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.

[0077] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] A power battery typically includes a housing and multiple battery cells, with the battery cells arranged inside the housing.

[0088] In some cases, the arrangement of battery cells within the casing allows for high space utilization, resulting in high energy density. However, this inevitably leads to very high maximum temperatures for the individual battery cells, impacting the battery's lifespan. In other cases, adjusting the cell arrangement within the casing can reduce the maximum temperature of the individual cells, extending the battery's lifespan. This, however, inevitably reduces space utilization, thus decreasing the battery's energy density. Consequently, it is difficult to simultaneously achieve optimal balance between maximum cell temperature and energy density in a power battery, making it challenging to keep both within their optimal ranges.

[0089] 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 problem caused by the arrangement tolerance between adjacent battery cells. This can improve the space utilization rate of the power battery and thus increase the energy density of the power battery. 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 very high maximum temperature of the battery cell, which affects the service life of the power battery.

[0090] 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 lowering the maximum 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.

[0091] Based on the above considerations, this application provides a battery device and a power-consuming device. The battery device includes a housing and an array of battery cells disposed within the housing. The battery cell array includes multiple battery cells arranged in an M-row, N-column array. Each column of battery cells is arranged along a first direction, and the maximum dimension (second dimension) of the battery cells along the first direction * the number of battery cells in each column (M) / the maximum dimension (first dimension) of the two first inner walls along the first direction ∈ [0.846, 0.921]. That is, the sum of the maximum dimensions of the battery cells in each column in the first direction / the maximum dimension of the two first inner walls in the first direction is within the range of [0.846, 0.921]. This ensures that the battery cells in each column have a suitable maximum dimension and number in the first direction, allowing them to be arranged more compactly within the housing. In this way, on the one hand, the battery cells have a suitable flow path length, thereby keeping the maximum temperature of the battery cells within an optimal range, which is beneficial for 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 first direction, enabling the battery cell array to fully utilize the internal space of the housing in the first direction. This helps improve the space utilization of the battery device and is beneficial for increasing the energy density of the battery device. Therefore, by adopting the above technical solution, the maximum temperature and energy density of the battery device can both be within an optimal range.

[0092] It should be noted that although the battery device provided in this application is developed based on the problem of power batteries, which make it difficult to balance the maximum temperature of individual battery cells and the energy density of the power battery, its application scenarios are not limited to power batteries. Understandably, the battery device can be a power battery, or it can be an energy storage battery, etc.

[0093] 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.

[0094] In some embodiments, the battery device can be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module. As an example, multiple battery cells can be fixed to form a battery module by cable ties or the like. As an example, multiple battery cells can also be fixed to form a battery module by end plates, side plates, or the like.

[0095] In some embodiments, the battery device can be a battery pack, which may include a housing and individual battery cells. As an example, 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.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] The battery device provided in this application embodiment can also be used in electrical devices that use a battery device as a power source.

[0100] 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.

[0101] For ease of description, this application uses a vehicle as an example to illustrate the embodiments of the electrical device.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] In a single battery cell 11, the number of electrode components can be one or more.

[0112] In some contexts, electrode assemblies may also be referred to as bare cells, wound bodies, laminates, etc.

[0113] 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.

[0114] The housing 1121 is used to define the internal environment of the battery cell 11 and to house the electrode assembly and electrolyte.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] 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.

[0122] 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.

[0123] 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.

[0124] Please refer to Figures 4, 6 through 10, and 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 partial schematic diagram of the housing 2 from a third-direction Z-angle view. 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 third-direction Z-angle view. Figure 8 is an enlarged view of point A in Figure 7, Figure 9 is a cross-sectional view along BB in Figure 3, and Figure 10 is a partial enlarged view of Figure 9. The battery device 10 provided in this embodiment includes a housing 2 and a battery cell array 1. The housing 2 includes two first inner walls 2111, which are arranged opposite each other along a first direction Y, and the maximum distance between the two first inner walls 2111 along the first direction Y is a first dimension L1. The battery cell array 1 is disposed between the two first inner walls 2111. The battery cell array 1 includes multiple battery cells 11, which are arranged in an M-row, N-column array. In the battery cell array 1, each column of battery cells 11 is arranged along a first direction Y, and each row of battery cells 11 is arranged along a second direction X. The maximum dimension of the battery cell 11 along the first direction Y is a second dimension L2, and at least one end of the battery cell 11 along the first direction Y is provided with an electrode terminal 111. Where M≥1, N≥1, and M and N are both positive integers. The second dimension L2*M / first dimension L1∈[0.846, 0.921]. The first direction Y intersects the second direction X.

[0125] The first inner wall 2111 refers to the inner wall surface of the internal space of the box 2. Specifically, the first part 21 of the box 2 may have a first inner wall 2111, and the second part 22 of the box 2 may also have a first inner wall 2111. As an example, as shown in Figure 2, both the first part 21 and the second part 22 of the box 2 have a first inner wall 2111. As another example, as shown in Figures 4 and 6, the first inner wall 2111 is provided on the first part 21 of the box 2.

[0126] Understandably, the battery cell array 1 is located inside the housing 2 and between the two first inner walls 2111.

[0127] Understandably, the battery cell array 1 comprises M*N battery cells 11, which are arranged in M ​​rows and N columns. The M*N battery cells 11 are arranged in an array within the housing 2 and located between the two first inner walls 2111. Therefore, the battery cell array 1 refers to an array formed by M*N battery cells 11 arranged in M ​​rows and N columns.

[0128] In the battery cell array 1, each column of battery cells 11 includes M battery cells 11, and each row of battery cells 11 includes N battery cells 11. M can be 1 or greater than 1, for example, 2, 3, 4, 5, 6, 7, 8, 9, etc. N can be 1 or greater than 1, for example, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, etc. As an example, as shown in Figure 7, M is 3, and N is greater than 3. Furthermore, the battery cell array 1 can also be a one-row-one-column structure, i.e., M and N are both 1; it can also be a two-row-one-column structure, i.e., M is 2, N is 1; it can also be a one-row-two-column structure, i.e., M is 1, N is 2; or it can also be a two-row-two-column structure, i.e., M and N are both 2.

[0129] In battery cell array 1, each column of battery cells 11 is arranged along the first direction Y, meaning that when M is greater than 1, the M battery cells 11 in each column are distributed sequentially along the first direction Y. In battery cell array 1, each row of battery cells 11 is arranged along the second direction X, meaning that when N is greater than 1, the N battery cells 11 in each row are distributed sequentially along the second direction X.

[0130] 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.

[0131] 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 first 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 first 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, and an electrolyte disposed within the housing 1121. It should be noted that the maximum dimension of the battery cell 11 along the first direction Y refers to the maximum dimension of the entire assembly formed by the cell body 112 and the electrode terminals 111 along the first direction Y. That is, when electrode terminals 111 are located at opposite ends of the battery cell 11 along the first direction Y, the maximum dimension between the electrode terminals 111 at opposite ends of the cell body 112 along the first direction Y is the second dimension L2.

[0132] It should be further explained that, based on the arrangement of electrode terminals 111 at one end of the battery cell 11 along the first direction Y, given a predetermined maximum dimension of the two first inner walls 2111 along the first direction Y, the size of the cell body 112 of each row of battery cells 11 in the first direction Y can be made very large. That is, the housing 2 can be arranged with cell bodies 112 with very large dimensions along the first 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 first direction Y facilitates current flow in the battery cell 11.

[0133] The second dimension L2*M / first dimension L1∈[0.846, 0.921] means that 0.846≤second dimension L2*M / first dimension L1≤0.921. The specific values ​​of the second dimension L2*M / first dimension L1 can be 0.846, 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, 0.91, 0.92, 0.921, etc.

[0134] The first direction Y refers to the approximate distribution direction of the cell body 112 and the electrode terminals 111, that is, the arrangement direction of each row of battery cells 11. In some cases, the first direction Y can be the length extension direction of the battery cell 11.

[0135] The intersection of the first direction Y and the second direction X means that the first direction Y and the second direction X can form an angle greater than 0° and less than 180°, that is, the first direction Y and the second direction X are not parallel. The first direction Y and the second direction X can be perpendicular to each other, or they can be non-perpendicular. The first direction Y and the second direction X can be intersecting directions located on the same plane, or they can be directions on skew planes, and the projection of the second direction X onto the plane containing the first direction Y can intersect the first direction Y. As an example, the first direction Y and the second direction X are perpendicular.

[0136] The battery device 10 provided in this application embodiment includes a housing 2 and a battery cell array 1 disposed within the housing 2. The battery cell array 1 includes a plurality of battery cells 11 arranged in an array of M rows and N columns. Each column of battery cells 11 is arranged along a first direction Y, and the maximum dimension of the battery cell 11 along the first direction Y (i.e., the second dimension L2) * the number of battery cells 11 in each column (i.e., M) / the maximum dimension of the two first inner walls 2111 along the first direction Y (i.e., the first dimension L1) ∈ [0.846, 0.921]. That is, in each column of battery cells 11 The sum of the maximum dimensions of the battery cells 11 in the first direction Y / the maximum dimensions of the two first inner walls 2111 in the first direction Y are within the range of [0.846, 0.921], so that when the maximum dimensions of the two first inner walls 2111 in the first direction Y are predetermined, each row of battery cells 11 has a more suitable number of battery cells 11, that is, the value of M is more suitable, and the battery cells 11 have a more suitable maximum dimension in the first direction Y, so that each row of battery cells 11 can be arranged more compactly in the housing 2 in the first direction Y.

[0137] This configuration has several advantages. First, because the battery cell 11 has a suitable maximum size in the first direction Y, it allows for a suitable flow path length. This mitigates the problem of excessive heat generation caused by an overly large flow path, keeping the heat generation of the battery cell 11 within an optimal range. Consequently, the maximum temperature of the battery cell 11 remains within an optimal range, which helps extend the lifespan of the battery device 10. Second, because each row of battery cells 11 has a suitable number of cells, each row has high grouping efficiency in the first direction Y. For example, it can save on components between adjacent battery cells 11 along the first direction Y, and reduce the arrangement of the casing 1121 of the battery cells 11 in the first direction Y. This reduces space waste caused by the arrangement tolerance between adjacent battery cells 11, allowing the battery cell array 1 to fully utilize the internal space of the housing 2 in the first direction Y. This helps improve the space utilization of the battery device 10 and increases its energy density. Therefore, by adopting the above technical solution, the maximum temperature and energy density of the battery device 10 can both be within an optimal range. That is, while the maximum temperature of the individual battery cells 11 in the battery device 10 is relatively low, the battery device 10 has a high energy density. This allows the battery device 10 to combine the advantages of a low maximum temperature of the individual battery cells 11 and a high energy density of the power battery, thereby improving the performance and reliability of the battery device 10. In this way, the battery device 10 can possess high-efficiency fast charging capabilities.

[0138] It should be further explained that by adopting the above technical solution, each row of battery cells 11 can be arranged relatively compactly within the housing 2 along the first direction Y, thereby allowing the battery cell array 1 to be arranged relatively compactly within the housing 2 along the first direction Y. In this way, on the one hand, the battery cells 11 in each row can be arranged relatively compactly along the first direction Y, and the arrangement of each row of battery cells 11 with the first inner wall 2111 can also be relatively compact along the first direction Y, which helps to improve the space utilization of the battery device 10 and thus improve its energy density. On the other hand, the arrangement of the battery cells 11 in each row and with the first inner wall 2111 is not excessively compact, thus facilitating heat dissipation for the battery cells 11 and helping to reduce the maximum temperature of the battery cells 11.

[0139] In some embodiments, the battery cell 11 can be approximately cylindrical in shape, and the first direction Y is approximately the length extension direction of the battery cell 11, that is, the axial direction of the battery cell 11.

[0140] 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 length, width, and thickness. The length of the battery cell 11 can be greater than its width and its thickness. The first direction Y can be approximately the length extension direction of the battery cell 11, the second direction X can be approximately the thickness extension direction of the battery cell 11, and the third direction Z can be approximately the width extension direction of the battery cell 11. The first direction Y and the third direction Z intersect, and the second direction X and the third direction Z intersect.

[0141] The meanings of the intersection of the first direction Y and the third direction Z, and the intersection of the second direction X and the third direction Z, can be explained in the same way as the intersection of the first direction Y and the second direction X, and will not be repeated here. As an example, the first direction Y is perpendicular to the second direction X, the first direction Y is perpendicular to the third direction Z, and the second direction X is perpendicular to the third direction Z.

[0142] In some embodiments, please refer to Figures 6 to 10 together, and in conjunction with other figures. Second dimension L2*M / First dimension L1∈[0.897, 0.921].

[0143] The second dimension L2*M / first dimension L1∈[0.897, 0.921] means that 0.897≤second dimension L2*M / first dimension L1≤0.921. The specific values ​​of the second dimension L2*M / first dimension L1 can be 0.897, 0.9, 0.905, 0.91, 0.915, 0.92, 0.921, etc.

[0144] This configuration allows the battery device 10 to maintain both its maximum temperature and energy density within an optimal range.

[0145] In some embodiments, please refer to Figures 6 through 10 together with other figures. The second dimension L2 ≤ 400 mm.

[0146] The second dimension L2 ≤ 400mm, specifically it can be 50mm, 100mm, 150mm, 200mm, 250mm, 300mm, 350mm, 400mm, etc.

[0147] In some embodiments, please refer to Figures 6 to 10 together with other figures. The second dimension L2 ≥ 200 mm.

[0148] Understandably, 200mm ≤ second dimension L2 ≤ 400mm, and 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.

[0149] By adopting the above technical solution, the maximum dimension (i.e., the second dimension L2) of the battery cell 11 in the first direction Y has a certain range of values. This allows the battery cell 11 to have a suitable flow path length, thus mitigating the problem of excessive heat generation caused by an excessively large flow path. This keeps the heat generation of the battery cell 11 within an optimal range, thereby keeping the maximum temperature of the battery cell 11 within an optimal range and extending the service life of the battery device 10. Furthermore, with the maximum dimensions of the two first inner walls 2111 predetermined along the first direction Y, each row of battery cells 11 has a suitable number of battery cells 11, i.e., the value of M is more appropriate. This improves the grouping efficiency of each row of battery cells 11 in the first direction Y, allowing the battery cell array 1 to fully utilize the internal space of the housing 2 in the first direction Y, which helps improve the space utilization of the battery device 10 and its energy density.

[0150] In some embodiments, please refer to Figures 6 through 10 together with other figures. M ≥ 3.

[0151] Specifically, M can be 3, 4, 5, 6, 7, 8, 9, 10, etc.

[0152] By ensuring that M≥3, the maximum size of the battery cell 11 in the first direction Y is not too large when the maximum size of the two first inner walls 2111 is predetermined. This allows the battery cell 11 to have a flow path of a suitable length, which can improve the problem of excessive heat generation caused by excessive flow path of the battery cell 11. This keeps the heat generation of the battery cell 11 within an optimal range, thereby keeping the maximum temperature of the battery cell 11 within an optimal range, which is beneficial to extending the service life of the battery device 10.

[0153] In some embodiments, please refer to Figures 6 through 10 together with other figures. M ≤ 8.

[0154] Understandably, 3≤M≤8, where M can be 3, 4, 5, 6, 7, or 8.

[0155] This configuration ensures that, given the predetermined maximum dimensions of the two first inner walls 2111 along the first direction Y, the maximum dimension of the battery cell 11 in the first direction Y is neither too large nor too small, and the number of battery cells 11 in each row is appropriate. This has two advantages: First, it allows the battery cell 11 to have a suitable flow path length, mitigating the problem of excessive heat generation caused by an excessively large flow path. This keeps the heat generation of the battery cell 11 within an optimal range, thus keeping the maximum temperature of the battery cell 11 within an optimal range, which helps extend the lifespan of the battery device 10. Second, it improves the grouping efficiency of each row of battery cells 11 in the first direction Y, allowing the battery cell array 1 to fully utilize the internal space of the housing 2 in the first direction Y, thus improving the space utilization of the battery device 10 and increasing its energy density.

[0156] In some embodiments, please refer to Figures 3, 4, 6, 7, and 11 together, and in conjunction with other figures. Figure 11 is a partial schematic diagram of a battery device 10 according to some embodiments of this application, specifically a partial schematic diagram of the battery device 10 from a third-direction Z-view. 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 its width.

[0157] 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.

[0158] 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.

[0159] In some possible designs, as shown in Figure 7, the first direction Y is the length direction a of the battery device 10. The maximum dimension of the battery device 10 along the first direction Y can be the length of the battery device 10, i.e., the fifth dimension L5 hereinafter refers to as the length of the battery device 10. The second 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 second direction X can be the width of the battery device 10.

[0160] Alternatively, in some other possible designs, as shown in Figure 11, the first direction Y is the width direction b of the battery device 10. The maximum dimension of the battery device 10 along the first direction Y can be the width of the battery device 10, i.e., the fifth dimension L5 hereinafter refers to as the width of the battery device 10. The second 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 second direction X can be the length of the battery device 10.

[0161] By adopting the above technical solution, the battery cell array 1 can be arranged in the housing 2 as needed, which can improve the flexibility and convenience of arranging the battery cell array 1 in the housing 2.

[0162] In some embodiments, please refer to FIG7, and in conjunction with other figures. The first direction Y is the travel direction c of the electrical device having the battery device 10.

[0163] As an example, when the electrical device is vehicle 3000, the direction of travel of the electrical device c is the length extension direction of vehicle 3000, which is also the driving direction of vehicle 3000.

[0164] Understandably, when the first 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 first 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.

[0165] In some embodiments, please refer to FIG11, and in conjunction with other figures. The second direction X is the travel direction c of the electrical device having the battery device 10.

[0166] Understandably, when the second direction X is the length direction a of the battery device 10, as shown in Figure 11, the length direction a of the battery device 10 is the traveling direction c of the power-consuming device. The first direction Y intersects the length direction a of the battery device 10; for example, the first direction Y can be the width direction b of the battery device 10.

[0167] When the second 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 first direction Y intersects the width direction b of the battery device 10; for example, the first direction Y is the length direction a of the power-consuming device.

[0168] By adopting the above technical solution, the battery cell array 1 can be arranged in the housing 2 as needed, which can improve the flexibility and convenience of the battery device 10 in the power supply device.

[0169] In some embodiments, please refer to Figures 5 to 10 together, and in conjunction with other figures. A battery cell 11 has a first surface 101 at opposite ends along a first direction Y, and electrode terminals 111 extend from the first surface 101. A second surface 102 is provided on opposite sides along a second direction X of the battery cell 11, and the area of ​​the first surface 101 is smaller than the area of ​​the second surface 102.

[0170] Understandably, each battery cell 11 has electrode terminals 111 at both opposite ends along the first direction Y. The cell body 112 of the battery cell 11 has a first surface 101 at both opposite ends along the first direction Y; that is, the outer casing 1121 has a first surface 101 at both opposite ends along the first 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 second direction X; that is, the outer casing 1121 has a second surface 102 at both opposite sides along the second 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.

[0171] 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 first direction Y is greater than the maximum dimension of the cell body 112 along the second direction X. Consequently, the maximum dimension of the battery cell 11 along the first direction Y (i.e., the second dimension L2) is greater than the maximum dimension of the cell body 112 along the second direction X (i.e., the third dimension L3 hereinafter). 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, thereby reducing the maximum temperature of the battery cell 11.

[0172] In some embodiments, please refer to Figures 5 to 8 together with other figures. The maximum dimension of the battery cell 11 along the second direction X is the third dimension L3, where the third dimension L3 ∈ [10 mm, 45 mm].

[0173] Among them, the maximum dimension of the battery cell 11 along the second direction X refers to the maximum dimension of the main body 112 of the battery cell 11 along the second direction X, which is also the maximum dimension of the outer casing 1121 along the second direction X, and is the third dimension L3.

[0174] Specifically, 10mm ≤ third dimension L3 ≤ 45mm, and the third dimension L3 can be 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, etc.

[0175] This configuration allows the battery cells 11 to have a suitable size along the second direction X. On one hand, the size design of the battery cells 11 along the second direction X allows for better heat dissipation, keeping the maximum temperature of the battery cells 11 within an optimal range and extending the lifespan of the battery device 10. On the other hand, given a predetermined maximum dimension between the two opposing inner walls of the housing 2 along the second direction X, the suitable size of the battery cells 11 along the second direction X allows for a suitable number of battery cells 11 per row, i.e., a suitable value for N. This results in higher grouping efficiency for each row of battery cells 11 along the second direction X. For example, it can save on components between adjacent battery cells 11 along the second direction X, reducing space waste caused by arrangement tolerances between adjacent battery cells 11. This allows the battery cell array 1 to fully utilize the internal space of the housing 2 along the second direction X, improving the space utilization rate of the battery device 10 and increasing its energy density. Therefore, by adopting the above technical solution, it is helpful to ensure that the maximum temperature and energy density of the battery device 10 are both within an optimal range.

[0176] In some embodiments, please refer to Figures 5 through 8 together with other figures. The third dimension L3 ∈ [15mm, 30mm].

[0177] Specifically, 15mm ≤ third dimension L3 ≤ 30mm, and the third dimension L3 can be 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, etc.

[0178] By adopting the above technical solution, the battery cell 11 has a more suitable size along the second direction X. This allows the battery cell 11 to have better heat dissipation capabilities, keeping its maximum temperature within an optimal range. Furthermore, given a predetermined maximum size between the two opposing inner walls of the housing 2 along the second direction X (i.e., the second inner wall 2141 hereinafter), the value of N can be within a suitable range. This allows each row of battery cells 11 to have a more suitable packing efficiency in the second direction X, enabling the battery cell array 1 to fully utilize the internal space of the housing 2 in the second direction X, thus improving the space utilization of the battery device 10 and increasing its energy density. Therefore, by adopting the above technical solution, both the maximum temperature and energy density of the battery device 10 can be kept within optimal ranges.

[0179] In some embodiments, please refer to Figures 5 to 10 together, and in conjunction with other figures. The battery cell 11 has a third surface 103 at opposite ends along a third direction Z, and the area of ​​the second surface 102 is larger than the area of ​​the third surface 103. The third direction Z intersects the first direction Y, and the third direction Z intersects the second direction X.

[0180] The single body 112 has a third surface 103 at both ends along the third direction Z, that is, the outer shell 1121 has a third surface 103 at both ends along the third 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.

[0181] 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 third direction Z is greater than the maximum dimension of the battery cell 112 along the second direction X. That is, the fourth dimension L4 mentioned below is greater than the third dimension L3, meaning that 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.

[0182] 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 first direction Y is greater than the maximum dimension of the battery cell 11 along the third direction Z (i.e., the fourth dimension L4), and the maximum dimension of the battery cell 11 along the third direction Z is greater than the maximum dimension of the battery cell 11 along the second direction X (i.e., the third dimension L3). 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.

[0183] In some embodiments, please refer to Figures 5, 9 and 10 together, and in conjunction with other figures. The maximum dimension of the battery cell 11 along the third direction Z is the fourth dimension L4, where the fourth dimension L4 ∈ [60 mm, 160 mm].

[0184] Among them, the maximum dimension of the battery cell 11 along the third direction Z refers to the maximum dimension of the main body 112 of the battery cell 11 along the third direction Z, which is also the maximum dimension of the outer casing 1121 along the third direction Z, and is the fourth dimension L4.

[0185] Specifically, 60mm ≤ fourth dimension L4 ≤ 160mm, and the fourth dimension L4 can be 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, etc.

[0186] By adopting the above technical solution, the battery cell 11 has a suitable maximum size in the third direction Z, which helps to give the battery cell 11 better heat dissipation capabilities, thereby reducing the maximum temperature of the battery cell 11. Furthermore, this configuration makes the battery cell 11 a short-blade battery.

[0187] In some embodiments, please refer to Figures 5, 9, and 10 together, and in conjunction with other figures. The fourth dimension L4 ∈ [80 mm, 130 mm].

[0188] Specifically, 80mm ≤ fourth dimension L4 ≤ 130mm, and the fourth dimension L4 can be 80mm, 85mm, 90mm, 95mm, 100mm, 105mm, 110mm, 115mm, 120mm, 125mm, 130mm, etc.

[0189] By adopting the above technical solution, the battery cell 11 has a more suitable maximum size in the third direction Z, which helps the battery cell 11 to have better heat dissipation capacity and reduce the maximum temperature of the battery cell 11.

[0190] In some embodiments, please refer to Figures 6 to 10 together, and in conjunction with other figures. The housing 2 includes two first walls 211 disposed opposite each other along the first direction Y. The first inner wall 2111 is the inner wall of the first wall 211, and the outer wall of the first wall 211 is the first outer wall 2112. The maximum distance between the first outer walls 2112 of the two first walls 211 along the first direction Y is the fifth dimension L5, and the second dimension L2*M / fifth dimension L5∈[0.815, 0.894].

[0191] The first wall 211 is a solid wall of the box 2, and the two first walls 211 are arranged opposite each other along the first direction Y. Among them, the wall surfaces of the two first walls 211 facing each other along the first direction Y are the first inner wall 2111, and the wall surfaces of the two first walls 2111 facing away from each other along the first direction Y are the first outer wall 2112.

[0192] The second dimension L2*M / the fifth dimension L5 ∈ [0.81, 0.9] means that 0.815 ≤ the second dimension L2*M / the fifth dimension L5 ≤ 0.894. The specific values ​​of the second dimension L2*M / the fifth dimension L5 can be 0.815, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.894, etc.

[0193] By adopting the above technical solution, the battery cell 11 has a suitable maximum size along the first direction Y, and each row of battery cells 11 has a suitable number of battery cells 11. This ensures that the maximum temperature and energy density of the battery device 10 are both within an optimal range.

[0194] In some embodiments, please refer to Figures 6 to 10 together with other figures. Second dimension L2*M / Fifth dimension L5∈[0.864, 0.894].

[0195] The second dimension L2*M / the fifth dimension L5 ∈ [0.864, 0.894] means that 0.864 ≤ the second dimension L2*M / the fifth dimension L5 ≤ 0.894. The specific values ​​of the second dimension L2*M / the fifth dimension L5 can be 0.864, 0.865, 0.87, 0.875, 0.88, 0.885, 0.89, 0.894, etc.

[0196] By adopting the above technical solution, the battery cell 11 has a suitable maximum size along the first direction Y, and each row of battery cells 11 has a suitable number of battery cells 11. This ensures that the maximum temperature and energy density of the battery device 10 are both within an optimal range.

[0197] The following is a detailed explanation using specific experimental data:

[0198] In the experiment, taking the length extension direction of battery cell 11 as consistent with the first direction Y, the thickness extension direction of battery cell 11 as consistent with the second direction X, and the width extension direction of battery cell 11 as consistent with the third direction Z as an example, the specific data are shown in Table 1:

[0199] Table 1

[0200] As can be seen from the above embodiments, when the value of the second dimension L2*M / first dimension L1 is within the range of [0.846, 0.921], and the value of the second dimension L2*M / fifth dimension L5 is within the range of [0.815, 0.894], the energy density of the battery device 10 is ≥260Wh / L, and the maximum temperature of the battery cell 11 is less than 60℃. This ensures that both the maximum temperature and energy density of the battery device 10 are within an optimal range. That is, while the maximum temperature of the battery cell 11 is low, the battery device 10 has a high energy density, allowing it to balance the advantages of a low maximum temperature of the battery cell 11 and a high energy density of the power battery, thus enabling the battery device 10 to have high-efficiency fast charging capability.

[0201] In some embodiments, please refer to Figures 6 to 8 together with other figures. The housing 2 includes two second inner walls 2141, which are arranged opposite each other along the second direction X, and each second inner wall 2141 is connected between two first inner walls 2111. The battery cell array 1 is disposed inside the housing 2 and is located between the two second inner walls 2141. The maximum distance between the two second inner walls 2141 in the second direction X is the sixth dimension L6, where the third dimension L3*N / sixth dimension L6 ∈ [0.771, 0.947].

[0202] Specifically, 0.771 ≤ third dimension L3*N / sixth dimension L6 ≤ 0.947, and the specific values ​​of the third dimension L3*N / sixth dimension L6 can be 0.771, 0.78, 0.79, 0.8, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, 0.91, 0.92, 0.93, 0.94, 0.947, etc.

[0203] By adopting the above technical solution, given a predetermined maximum dimension of the two second inner walls 2141 along the second direction X, each row of battery cells 11 has a suitable number of battery cells 11, i.e., the value of N is suitable, and the battery cells 11 have a suitable maximum dimension in the second direction X. This allows each row of battery cells 11 to be arranged relatively compactly within the housing 2 along the second direction X. This arrangement, on the one hand, ensures that the battery cells 11 have a suitable maximum dimension in the second direction X, enabling them to have higher heat dissipation capacity and facilitating efficient heat dissipation. This helps reduce the temperature of the battery cells 11, keeping their maximum temperature within an optimal range, thus extending the service life of the battery device 10. On the other hand, because each row of battery cells 11 has a suitable number of battery cells 11, each row of battery cells 11 has a high packing efficiency in the second direction X. For example, it can save on components between adjacent battery cells 11 along the second direction X, and save on the arrangement of the casing 1121 of the battery cells 11 in the second direction X. It can reduce the space waste caused by the arrangement tolerance between adjacent battery cells 11, so that the battery cell array 1 can make full use of the internal space of the housing 2 in the second 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, the battery device 10 can have high heat dissipation capacity and energy density, so that the maximum temperature and energy density of the battery device 10 can be within an optimal range. Thus, the battery device 10 can take into account the advantages of high heat dissipation capacity and high energy density, and the battery device 10 can have high-efficiency fast charging capability.

[0204] It should also be noted that by adopting the above technical solution, each row of battery cells 11 can be arranged relatively compactly within the housing 2 along the second direction X, thereby allowing the battery cell array 1 to be arranged relatively compactly within the housing 2 along the second direction X. In this way, on the one hand, the battery cells 11 in each row can be arranged relatively compactly along the second direction X, and the arrangement between each row of battery cells 11 and the second inner wall 2141 can also be relatively compact along the second direction X, which helps to improve the space utilization of the battery device 10 and thus improve its energy density. On the other hand, the arrangement between the battery cells 11 in each row and between each row of battery cells 11 and the second inner wall 2141 is not excessively compact, thus facilitating heat dissipation of the battery cells 11, improving the heat dissipation capacity of the battery device 10, and helping to reduce the maximum temperature of the battery cells 11.

[0205] In some embodiments, the third dimension L3*N / sixth dimension L6 ∈ [0.848, 0.947].

[0206] The third dimension L3*N / sixth dimension L6∈[0.848, 0.947] means that 0.848≤third dimension L3*N / sixth dimension L6≤0.947. The specific values ​​of the third dimension L3*N / sixth dimension L6 can be 0.848, 0.85, 0.855, 0.86, 0.865, 0.87, 0.875, 0.88, 0.885, 0.89, 0.895, 0.9, 0.905, 0.91, 0.915, 0.92, 0.925, 0.93, 0.935, 0.94, 0.947, etc.

[0207] This configuration allows the battery device 10 to have high heat dissipation capacity and energy density, thus enabling the battery device 10 to take into account the advantages of high heat dissipation capacity and high energy density.

[0208] In some embodiments, please refer to Figures 6 to 8 together with other figures. The housing 2 includes two second walls 214 disposed opposite to each other along the second direction X. The second inner wall 2141 is the inner wall of the second wall 214, and the outer wall of the second wall 214 is the second outer wall 2142. The maximum distance between the two second walls 214 along the second direction X is the seventh dimension L7, and the third dimension L3*N / seventh dimension L7∈[0.744, 0918].

[0209] The second wall 214 is a solid wall of the housing 2, and the two second walls 214 are arranged opposite each other along the second direction X. The facing surfaces of the two second walls 214 along the second direction X are the second inner walls 2141, and the opposing surfaces of the two second walls 214 along the second direction X are the second outer walls 2142. Each second wall 214 is connected between two first walls 211, such that the second inner wall 2141 of each second wall 214 is connected between two first inner walls 2111.

[0210] The second wall 214 may be, but is not limited to, an expansion beam inside the housing 2, used to resist the expansion of the battery cell 11 along the second direction X, so as to improve the reliability of the battery device 10.

[0211] The third dimension L3*N / seventh dimension L7∈[0.744, 0.918] means that 0.744≤third dimension L3*N / seventh dimension L7≤0.918. The specific values ​​of the third dimension L3*N / seventh dimension L7 can be 0.744, 0.75, 0.76, 0.77, 0.78, 0.79, 0.8, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, 0.91, 0.918, etc.

[0212] By adopting the above technical solution, the battery cell 11 has a suitable maximum size along the second direction X, and each row of battery cells 11 has a suitable number of battery cells 11. This facilitates the battery device 10 to have high heat dissipation capacity and high energy density.

[0213] In some embodiments, please refer to Figures 6 to 8 together with other figures. The third dimension L3*N / the seventh dimension L7 ∈ [0.82, 0.918].

[0214] The third dimension L3*N / seventh dimension L7∈[0.82, 0.92] means that 0.82≤third dimension L3*N / seventh dimension L7≤0.918. The specific values ​​of the third dimension L3*N / seventh dimension L7 can be 0.82, 0.825, 0.83, 0.835, 0.84, 0.845, 0.85, 0.855, 0.86, 0.865, 0.87, 0.875, 0.88, 0.885, 0.89, 0.895, 0.9, 0.905, 0.91, 0.915, 0.918, etc.

[0215] By adopting the above technical solution, the battery cell 11 has a suitable maximum size along the second direction X, and each row of battery cells 11 has a suitable number of battery cells 11. This ensures that the maximum temperature and energy density of the battery device 10 are both within an optimal range.

[0216] In some embodiments, please refer to Figures 6 through 8 together with other figures. N∈[40,150].

[0217] Understandably, 40≤N≤150, where N can be 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 105, 110, 115, 120, 125, 130, 135, 140, 145, 150, etc.

[0218] This configuration ensures that, given the predetermined maximum dimensions of the two second inner walls 2141 along the second direction X, the maximum dimension of the battery cell 11 in the second direction X is neither too large nor too small, and the number of battery cells 11 in each row is appropriate. This allows the battery cell 11 to have lower heat generation and higher heat dissipation capacity, which helps extend the lifespan of the battery device 10. Furthermore, it improves the grouping efficiency of each row of battery cells 11 in the second direction X, enabling the battery cell array 1 to fully utilize the internal space of the housing 2 in the second direction X, thus improving the space utilization rate of the battery device 10 and increasing its energy density. This configuration allows the battery device 10 to achieve both high heat dissipation capacity and high energy density.

[0219] In some embodiments, please refer to Figures 5, 9, and 10 together, and in conjunction with other figures. Each battery cell 11 includes at least one set of electrode terminals 111 at both opposite ends along the first direction Y. Each set of electrode terminals 111 includes a positive electrode terminal 111a and a negative electrode terminal 111b spaced apart along the third direction Z. The third direction Z intersects the first direction Y and the second direction X.

[0220] Understandably, each end of the battery cell 11 in the first 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 first direction Y are distributed at intervals along the third direction Z. Furthermore, in each end of the battery cell 11 in the first direction Y, the plurality of electrode terminals 111 are grouped in pairs and have different polarities.

[0221] Understandably, the battery cell 11 has at least one set of electrode terminals 111 at one end along the first direction Y, and at least one set of electrode terminals 111 is also provided at the other end along the first direction Y. Each set of electrode terminals 111 includes two electrode terminals 111 spaced apart along the third 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 third direction Z.

[0222] By providing at least one set of electrode terminals 111 with different polarities at each end of the battery cell 11 along the first 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 maximum temperature of the battery cell 11.

[0223] As an example, Figures 5, 9, 10, and 12 are shown, in conjunction with other figures. Figure 12 is a perspective view of the battery cell array 1 of the battery device 10 shown in Figure 3. Each end of the battery cell 11 along the first direction Y is provided with a set of electrode terminals 111, and each set of electrode terminals 111 includes a positive electrode terminal 111a and a negative electrode terminal 111b spaced apart along the third direction Z.

[0224] As shown in Figure 12, and in conjunction with other accompanying figures, the battery cell array 1 comprises multiple rows of battery cells 11, i.e., the number of M cells is multiple. The battery cell array 1 may include a first row of battery cells 11, a second row of battery cells 11, a third row of battery cells 11, ..., the penultimate row of battery cells 11, and the last row of battery cells 11. As an example, in each row of battery cells 11, the terminal electrodes 111 of each battery cell 11 along the first direction Y are connected in series through a busbar 3, so that each row of battery cells 11 has two total positive terminals and one total negative terminal. The two total positive terminals of the first row of battery cells 11 can be connected to serve as the total positive terminal of the battery cell array 1. The two negative terminals of the first row of battery cells 11 can be connected to the two positive terminals of the second row of battery cells 11 via the busbar 3. Similarly, the two negative terminals of the second row of battery cells 11 can be connected to the two positive terminals of the third row of battery cells 11 via the busbar 3, and so on. The two negative terminals of the second-to-last row of battery cells 11 can be connected to the two positive terminals of the last row of battery cells 11 via the busbar 3, thus connecting the first row of battery cells 11, the second row of battery cells 11, the third row of battery cells 11, and so on, to the second-to-last row of battery cells 11 and the last row of battery cells 11 in series. The two negative terminals of the last row of battery cells 11 are connected to serve as the total negative terminals of the battery cell array 1.

[0225] In some embodiments, please refer to Figures 5, 9, and 10 together, and in conjunction with other figures. The battery cell 11 also includes a pressure relief mechanism 113.

[0226] 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.

[0227] 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 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 in 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.

[0228] 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.

[0229] 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.

[0230] In some embodiments, please refer to Figures 5, 9, and 10 together, and in conjunction with other figures. At least one end of the battery cell 11 along the first direction Y includes the aforementioned pressure relief mechanism 113, which is spaced apart from the electrode terminals 111.

[0231] Understandably, the housing 1121 is provided with a pressure relief mechanism 113 at at least one end along the first direction Y.

[0232] By placing the pressure relief mechanism 113 at at least one end of the battery cell 11 along the first direction Y, the internal space 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 also facilitates the arrangement of thermal management components 212 at opposite ends of the battery cell array 1 along the third direction Z, and on this basis, the pressure relief mechanism 113 can effectively achieve the pressure relief effect of the battery cell 11.

[0233] In some embodiments, please refer to Figures 7 to 10 together, and in conjunction with other figures. M ≥ 2, and in each row of battery cells 11, insulating adhesive is provided between two adjacent battery cells 11.

[0234] Understandably, insulating adhesive can be provided between two adjacent battery cells 11 along the first direction Y.

[0235] Insulating adhesive may be provided between the outer casings 1121 of two adjacent battery cells 11 along the first direction Y. Insulating adhesive may also be provided between the electrode terminals 111 of two adjacent battery cells 11 along the first direction Y.

[0236] In some embodiments, please refer to Figures 7 to 10 together, and in conjunction with other figures. N≥2, and in each row of battery cells 11, insulating adhesive is provided between two adjacent battery cells 11.

[0237] Understandably, insulating adhesive may be provided between two adjacent battery cells 11 along the second direction X.

[0238] 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.

[0239] 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 the battery cell array 1, facilitating assembly of the battery assembly 10 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.

[0240] In some embodiments, an insulating adhesive may be provided between the first inner wall 2111 and the adjacent battery cell 11 to achieve insulation protection between the first inner wall 2111 and the battery cell 11.

[0241] In some embodiments, please refer to Figures 5, 9, and 10 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.

[0242] 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.

[0243] In some embodiments, please refer to Figures 5, 9, and 10 together, and in conjunction with other figures. The pressure relief mechanism 113 and the electrode terminal 111 are spaced apart along a third direction Z. In the third direction Z, insulating adhesive extends beyond the electrode terminal 111 and is spaced apart from the pressure relief mechanism 113. The third direction Z intersects the first direction Y and the second direction X.

[0244] 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 in the third direction Z, and the insulating adhesive and the pressure relief mechanism 113 are spaced apart in the third direction Z.

[0245] 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.

[0246] As an example, as shown in Figures 5, 9, and 10, and in conjunction with other figures, the housing 2 has a third inner wall 2121 at one end along the third direction Z. The third inner wall 2121 is the inner wall surface of the internal space of the housing 2. The third inner wall 2121 is connected between two first inner walls 2111, and the battery cell array 1 is disposed on the third inner wall 2121. Electrode terminals 111 are spaced apart along the third direction Z between the pressure relief mechanism 113 and the third inner wall 2121. Insulating adhesive is disposed on the third inner wall 2121, the housing 1121, and the electrode terminals 111. The insulating adhesive extends beyond the electrode terminals 111 along the third direction Z toward the pressure relief mechanism 113 and is spaced apart from the pressure relief mechanism 113 along the third direction Z.

[0247] Understandably, the height of the insulating adhesive in the third direction Z is lower than the distance between the pressure relief mechanism 113 and the first inner wall 2111 in the third direction Z, so that the insulating adhesive can fill between two adjacent battery cells 11 and avoid the pressure relief mechanism 113.

[0248] In some embodiments, please refer to Figures 4 to 10 together, and in conjunction with other figures. M≥2, and in each row of battery cells 11, a separator 213 is provided between two adjacent battery cells 11.

[0249] Understandably, a separator 213 may be provided between two adjacent battery cells 11 along the first direction Y. Specifically, a separator 213 is provided between the electrode terminals 111 of two adjacent battery cells 11 along the first direction Y, and the separator 213 separates the electrode terminals 111 of the two adjacent battery cells 11 along the first direction Y.

[0250] In some embodiments, N≥2, and in each row of battery cells 11, a separator 213 is provided between two adjacent battery cells 11.

[0251] Understandably, a separator 213 may be provided between two adjacent battery cells 11 along the second direction X. Specifically, a separator 213 may be provided between the outer casing 1121 of two adjacent battery cells 11 along the second direction X, and a separator 213 may be provided between the electrode terminals 111 of two adjacent battery cells 11 along the second direction X. The separator 213 separates the two adjacent battery cells 11 along the second direction X.

[0252] 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 cell array 1 and reduce the adverse effects of external factors such as vibration on the battery cell array 1, thus effectively enhancing the adaptability of the battery device 10.

[0253] In some embodiments, a separator 213 may be provided between the first inner wall 2111 and the adjacent battery cell 11, so that the separator 213 separates the electrode terminal 111 of the battery cell 11 from the first inner wall 2111. 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.

[0254] 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.

[0255] Specifically, the separating component 213 is configured as at least one of a heat-conducting component, a buffer component, a separating plate, and a separating beam. Based on separating two adjacent battery cells 11 or separating the battery cell 11 from the first inner wall 2111, the corresponding separating component 213 can be configured according to different needs to meet the corresponding usage requirements of the battery cell array 1.

[0256] When the separator 213 is a heat-conducting component, the separator is disposed between two adjacent battery cells 11 or between the first inner wall 2111 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.

[0257] When the separator 213 is a buffer, it is disposed between two adjacent battery cells 11 or between the first inner wall 2111 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 first inner wall 2111 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 first inner wall 2111 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.

[0258] When the separating component 213 is a separating plate, the separating plate is disposed between two adjacent battery cells 11 or between the first inner wall 2111 and the adjacent battery cell 11. By using the separating plate to separate two adjacent battery cells 11 or the first inner wall 2111 and the adjacent battery cell 11, the situation of the battery cell 11 being crushed and damaged can be reduced.

[0259] When the separating component 213 is a separating beam, the separating beam is set between two adjacent battery cells 11 or between the first inner wall 2111 and the adjacent battery cell 11. By using the separating beam to separate two adjacent battery cells 11 or the first inner wall 2111 and the adjacent battery cell 11, the situation of the battery cell 11 being crushed and damaged can be reduced.

[0260] In some embodiments, when an insulating adhesive is provided between two adjacent battery cells 11 or between the first inner wall 2111 and an adjacent battery cell 11, the insulating adhesive can be bonded and fixed to the separator 213.

[0261] In some embodiments, at least one end of the electrode terminal 111 along the first direction Y includes a pressure relief mechanism 113. The pressure relief mechanism 113 and the separating member 213 are spaced apart and disposed opposite to each other along the first direction Y, so that the separating member 213 can provide a certain degree of protection against thermal runaway of the battery cell 11.

[0262] In some embodiments, please refer to Figures 4, 6, 9, and 10 together, and in conjunction with other figures. The housing 2 also includes a thermal management component 212, which is provided at least at one end of the battery cell array 1 along a third direction Z. The thermal management component 212 is connected to the battery cells 11 to regulate the temperature of the battery cells 11. The third direction Z intersects the first direction Y and the second direction X.

[0263] The thermal management component 212 refers to a component capable of thermal management of the battery cell array 1. The thermal management component 212 may be, but is not limited to, a water-cooled plate, a water-cooled pipe, etc. The thermal management component 212 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 array 1.

[0264] A thermal management component 212 is provided at least one end of the battery cell array 1 along the third direction Z, so that the thermal management component 212 at at least one end of the battery cell array 1 along the third direction Z can perform thermal management on the battery cell array 1.

[0265] In some embodiments, please refer to Figures 4, 6, 9, and 10 together, and in conjunction with other figures. Thermal management components 212 are provided at both opposite ends of the battery cell array 1 along the third direction Z. This improves the thermal management efficiency of the battery cell array 1, thereby helping to reduce the maximum temperature of the battery cells 11 in the battery device 10. Furthermore, it helps to improve the temperature uniformity of the battery cell array 1, thereby helping to extend the service life of the battery device 10.

[0266] It should be further noted that, of the two thermal management components 212, one thermal management component 212 is disposed on the first part 21, and the other thermal management component 212 is disposed on the second part 22. The third inner wall 2121 may be disposed on the thermal management component 212.

[0267] In some embodiments, the thermal management component 212 may be provided with an inlet and an outlet. The heat exchange medium can enter the flow channel of the thermal management component 212 through the inlet and then flow out from the outlet to achieve circulation.

[0268] In some embodiments, the inlet and outlet distribution directions of one thermal management component 212 are approximately opposite to those of the other thermal management component 212. This arrangement can effectively improve the heat exchange efficiency of the heat exchange medium within the thermal management component 212 and the battery cell array 1, thereby helping to improve the thermal management efficiency of the battery cell array 1, which in turn helps to reduce the maximum temperature of the battery cells 11, and also helps to improve the temperature uniformity of the battery cell array 1.

[0269] The second wall 214 may be provided with openings for corresponding communication with the inlet and outlet of the heat management component 212, so that the external heat exchange medium can enter and exit the heat management component 212 through the first wall 211.

[0270] 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.

[0271] The electrical device provided in this application embodiment adopts the battery device 10 mentioned above, which enables the battery device 10 to balance energy density and the maximum temperature of the battery cell 11, 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.

[0272] As one embodiment of this application, as shown in Figures 4 to 10, the battery device 10 includes a housing 2 and a battery cell array 1. The housing 2 includes two first walls 211 arranged opposite each other along a first direction Y. The first walls 211 have a first inner wall 2111 and a first outer wall 2112 arranged opposite each other along the first direction Y. The maximum dimension of the first inner wall 2111 in the first direction Y is a first dimension L1, and the maximum dimension of the first outer wall 2112 in the first direction Y is a fifth dimension L5. The battery cell array 1 includes M*N battery cells 11, which are arranged in an M-row, N-column array to form the battery cell array 1. In the battery cell array 1, multiple battery cells 11 in each column are arranged along the first direction Y, and multiple battery cells 11 in each row are arranged along a second direction X. The maximum dimension of the battery cell 11 along the first direction Y is a second dimension L2, and electrode terminals 111 are provided at both ends of the battery cell 11 along the first direction Y. Where M∈[3,8], N∈[40,150], and M and N are both positive integers. The second dimension L2∈[200mm,400mm], the second dimension L2*M / the first dimension L1∈[0.846,0.921], the second dimension L2*M / the fifth dimension L5∈[0.815,0.894].

[0273] The first direction Y is perpendicular to the second direction X.

[0274] 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 enclosure includes two first inner walls disposed opposite each other along a first direction, and the maximum distance between the two first inner walls along the first direction is a first dimension. A battery cell array is disposed between two first inner walls; the battery cell array includes multiple battery cells arranged in an array of M rows and N columns; in the battery cell array, each column of battery cells is arranged along the first direction, and each row of battery cells is arranged along the second direction; the maximum dimension of the battery cell along the first direction is the second dimension, and at least one end of the battery cell along the first direction is provided with an electrode terminal; Where M≥1, N≥1, and M and N are both positive integers; the second dimension * M / the first dimension ∈ [0.846, 0.921]; the first direction intersects the second direction.

2. The battery device according to claim 1, wherein, The second dimension * M / the first dimension ∈ [0.897, 0.921].

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

4. The battery device according to any one of claims 1-3, wherein, The second dimension is ≤400mm.

5. The battery device according to any one of claims 1-4, wherein, M≥3。 6. The battery device according to any one of claims 1-5, wherein, M≤8。 7. The battery device according to any one of claims 1-6, 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 first direction is either the length direction of the battery device or the width direction of the battery device.

8. The battery device according to any one of claims 1-7, wherein, The first direction is the walking direction of the electrical device having the battery device; or, the second direction is the walking direction of the electrical device having the battery device.

9. The battery device according to any one of claims 1-8, wherein, The battery cell has a first surface at both ends along the first direction, and the electrode terminal extends out of the first surface; The battery cell has a second surface on each of its opposite sides along the second direction, and the area of ​​the first surface is smaller than the area of ​​the second surface.

10. The battery device according to claim 9, wherein, The maximum dimension of the battery cell along the second direction is the third dimension, and the third dimension is ∈ [10mm, 45mm].

11. The battery device according to claim 10, wherein, The third dimension is [15mm, 30mm].

12. The battery device according to any one of claims 9-11, wherein, The battery cell has a third surface at both ends along a third direction, the area of ​​the second surface is larger than the area of ​​the third surface, and the third direction intersects the first direction and the second direction respectively.

13. The battery device according to claim 12, wherein, The maximum dimension of the battery cell along the third direction is the fourth dimension, and the fourth dimension is ∈ [60mm, 160mm].

14. The battery device according to claim 13, wherein, The fourth dimension is [80mm, 130mm].

15. The battery device according to any one of claims 1-14, wherein, The enclosure includes two first walls arranged opposite each other along the first direction. The first inner wall is the inner wall of the first wall, and the outer wall of the first wall is the first outer wall. The maximum distance between the first outer walls of the two first walls along the first direction is the fifth dimension. The second dimension * M / the fifth dimension ∈ [0.815, 0.894].

16. The battery device according to claim 15, wherein, The second dimension * M / the fifth dimension ∈ [0.864, 0.894].

17. The battery device according to any one of claims 1-16, wherein, The battery cell includes at least one set of electrode terminals at each of its opposite ends in the first direction. Each set of electrode terminals includes positive electrode terminals and negative electrode terminals spaced apart along a third direction. The third direction intersects the first direction and the second direction, respectively.

18. The battery device according to any one of claims 1-17, wherein, The battery cell includes a pressure relief mechanism at least one end along the first direction, which is spaced apart from the electrode terminals.

19. The battery device according to any one of claims 1-18, wherein, M≥2, and in each column of battery cells, an insulating adhesive is provided between two adjacent battery cells; And / or, N≥2, and in each row of battery cells, insulating adhesive is provided between two adjacent battery cells.

20. The battery device according to claim 19, 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.

21. The battery device according to claim 20, wherein, The pressure relief mechanism and the electrode terminals are spaced apart along a third direction; in the third direction, the insulating adhesive extends beyond the electrode terminals and is spaced apart from the pressure relief mechanism; the third direction intersects the first direction and the second direction respectively.

22. The battery device according to any one of claims 1-21, wherein, M≥2, and in each column of battery cells, a separator is provided between two adjacent battery cells; And / or, N≥2, and in each row of battery cells, a separator is provided between two adjacent battery cells.

23. The battery device according to any one of claims 1-22, wherein, The housing also includes a thermal management component disposed at at least one end of the battery cell array along a third direction. The thermal management component is connected to the battery cell to regulate the temperature of the battery cell. The third direction intersects the first direction and the second direction, respectively.

24. An electrical appliance, wherein, Includes the battery device according to any one of claims 1-23.

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