Battery device

Abstract

The invention discloses a battery device, the battery device comprises a box body, a plurality of single batteries and gaskets, the plurality of single batteries are arranged in the box body, the gaskets are arranged between at least part of adjacent two single batteries, a plurality of cavities which are separated from each other are formed in the gaskets, the side surfaces, facing the gaskets, of the single batteries are first side surfaces, and the gaskets abut against the first side surfaces; the cavities are filled with filling gas, and the filling densities of the filling gas in at least part of the cavities are different. According to the battery device provided by the invention, the temperature difference between different positions of the battery monomer can be reduced by adjusting the filling density of the gas filled in the cavities corresponding to the different positions of the first side surface according to the heat distribution conditions of the different positions on the first side surface, so that the overall temperature distribution of the battery monomer is more uniform; therefore, the charging and discharging efficiency of the battery monomer can be improved, and the cycle life of the battery monomer is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery device. BACKGROUND

[0002] In a battery pack structure, due to the influence of factors such as battery structure and liquid cooling plate, the temperature of different positions of the battery during charging and discharging also has a large difference. The uneven temperature will cause the charging and discharging efficiency of the battery to decrease. The high-temperature area may have faster capacity attenuation due to accelerated chemical reaction, and the low-temperature area may have insufficient output power due to reduced activity, which directly affects the cycle life of the battery. SUMMARY

[0003] The present application provides a battery device, which has the advantages of high charging and discharging efficiency and long cycle life.

[0004] The battery device according to the embodiments of the present application comprises: a box body; a plurality of battery monomers arranged in the box body, at least part of two adjacent battery monomers being provided with a gasket, a plurality of cavities being formed in the gasket and spaced apart from each other, a side of the battery monomer facing the gasket being a first side, the gasket abutting against the first side, a plurality of cavities being distributed at different positions of the first side, the cavities being filled with gas, and the filling density of the gas in at least part of the cavities being different.

[0005] The battery device according to the embodiments of the present application can adjust the filling density of the gas in the cavities at different positions of the first side according to the heat distribution at different positions of the first side, reduce the temperature difference between different positions of the battery monomer, make the overall temperature distribution of the battery monomer more uniform, thereby improving the charging and discharging efficiency of the battery monomer and prolonging the cycle life of the battery monomer.

[0006] According to some embodiments of the present application, the battery monomer comprises a shell, an electrode assembly and a pole, the electrode assembly is arranged in the shell, the pole is arranged in the shell and located on at least one side of the shell along a first direction, a side of the shell facing the gasket is the first side, a plurality of cavities comprise a first cavity and a second cavity arranged along the first direction, the second cavity is located on a side of the first cavity away from the pole, and the filling density of the gas in the first cavity is greater than the filling density of the gas in the second cavity.

[0007] According to some embodiments of the present invention, the electrode post includes a positive electrode post and a negative electrode post, the positive electrode post and the negative electrode post are located on the same side of the housing along the first direction, the first cavity is provided with a plurality of positive cavities and negative cavities, the positive cavities and the negative cavities are arranged along a second direction, the second direction being perpendicular to the first direction, the first side surface includes a first region and a second region arranged along the first direction, the second region being located on the side of the first region away from the electrode post, the positive electrode cavity and the negative electrode cavity are disposed in the first region, the second cavity is disposed in the second region, and along the first direction, the size L1 of the first region and the size L2 of the second region satisfy: 1.5≤L2 / L1≤3.

[0008] According to some embodiments of the present invention, the electrode post includes a positive electrode post and a negative electrode post, the positive electrode post and the negative electrode post being located on opposite sides of the housing along the first direction. The first cavity is provided with a plurality of positive cavities and negative cavities, the positive cavities and the negative cavities being located on opposite sides of the second cavity along the first direction. The first side surface includes a third region, a fourth region and a fifth region arranged along the first direction, the third region and the fifth region being located on opposite sides of the fourth region along the first direction. The positive electrode cavity is located in the third region, the second cavity is located in the fourth region, and the negative electrode cavity is located in the fifth region. Along the first direction, the dimensions L3 of the third region, L4 of the fourth region and L5 of the fifth region satisfy: 3≤L4 / L3≤5; 3≤L4 / L5≤5.

[0009] According to some embodiments of the present invention, the electrode post includes a positive electrode post and a negative electrode post, the resistance of the positive electrode post is greater than the resistance of the negative electrode post, the first cavity is provided with a plurality of positive cavities and negative cavities, the positive electrode cavity is located on the side of the second cavity near the positive electrode post, the negative electrode cavity is located on the side of the second cavity near the negative electrode post, and the filling density of the gas in the positive electrode cavity is greater than the filling density of the gas in the negative electrode cavity.

[0010] According to some embodiments of the present invention, the battery device further includes a cold plate, the terminals include a positive terminal and a negative terminal, the positive terminal and the negative terminal are located on one side of the housing along the first direction, the cold plate is located on the other side of the housing along the first direction, and the plurality of second cavities include a central cavity and an edge cavity, the central cavity is located in the middle of the first side, the edge cavity is located on the side of the central cavity away from the first cavity, and the filling density of the gas in the central cavity is greater than the filling density of the gas in the edge cavity.

[0011] According to some embodiments of the present invention, the first side includes a second region, the second cavity is disposed within the second region, the second region includes a first sub-region and a second sub-region arranged along the first direction, the second sub-region is located on the side of the first sub-region away from the pole post, the central cavity is disposed within the first sub-region, the edge cavity is disposed within the second sub-region, along the first direction, the size of the first sub-region is larger than the size of the second sub-region, and the size L6 of the first sub-region and the size L7 of the second sub-region satisfy: 3≤L6 / L7≤5.

[0012] According to some embodiments of the present invention, the battery cell is a square battery, and at least one spacer is provided between any two adjacent battery cells arranged along the thickness direction of the battery cell.

[0013] According to some embodiments of the present invention, a heat insulation sheet is further provided between two adjacent battery cells, and a gasket is provided between the heat insulation sheet and the battery cells located on opposite sides of the heat insulation sheet.

[0014] According to some embodiments of the present invention, the filling gas is a flame-retardant gas or an inert gas.

[0015] According to some embodiments of the present invention, the gasket is a rubber component or a ceramic fiber component.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the internal structure of a battery device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the distribution of battery cells and cavities in a battery device according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the distribution of battery cells and cavities in a battery device according to another embodiment of the present invention; Figure 4 This is a schematic diagram of the internal structure of a battery device according to another embodiment of the present invention.

[0018] Figure label: 100. Battery device; 1. Housing; 2. Battery cell; 21. Shell; 211. First side; 2111. First region; 2112. Second region; 2113. Third region; 2114. Fourth region; 2115. Fifth region; 22. Terminal; 22a. Positive terminal; 22b. Negative terminal; 3. Gasket; 31. Cavity; 311. First cavity; 311a. Positive cavity; 311b. Negative cavity; 312. Second cavity; 312a. Central cavity; 312b. Edge cavity; 4. Heat insulation sheet. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below, examples of which are illustrated 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 the present invention, and should not be construed as limiting the present invention.

[0020] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. Additionally, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0021] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention 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 invention.

[0022] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0023] In the description of this invention, "a plurality of" means two or more.

[0024] In the description of this invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0025] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0026] A battery device 100 according to an embodiment of the present invention will now be described with reference to the accompanying drawings.

[0027] like Figure 1 and Figure 2 As shown, the battery device 100 according to an embodiment of the present invention includes: a housing 1, a plurality of battery cells 2 and a gasket 3. The plurality of battery cells 2 are disposed inside the housing 1, and a gasket 3 is provided between at least some of two adjacent battery cells 2. The gasket 3 can effectively block the heat transfer between the battery cells 2 on both sides. When a battery cell 2 experiences thermal runaway, the gasket 3 can effectively control the heat transfer to other adjacent battery cells 2, thereby effectively controlling the spread of thermal runaway after the battery cell 2 experiences thermal runaway, so as to improve the safety of the battery device 100.

[0028] The gasket 3 contains multiple spaced-apart cavities 31. The side of the battery cell 2 facing the gasket 3 is designated as the first side 211. The gasket 3 abuts against the first side 211, meaning the gasket 3 is attached to the first side 211. The multiple cavities 31 are distributed at different positions on the first side 211. Each cavity 31 is filled with gas, and at least some cavities 31 contain gas with different filling densities. It should be noted that the filling density of the gas in the cavity 31 refers to the ratio of the total weight of the gas in the cavity 31 to the volume of the cavity 31. A higher filling density of the gas in the cavity 31 results in a greater number of gas molecules per unit volume, leading to better thermal conductivity and easier heat dissipation in the cavity 31 area. Conversely, a lower filling density of the gas in the cavity 31 results in a smaller number of gas molecules per unit volume, leading to poorer thermal conductivity and easier heat insulation in the cavity 31 area.

[0029] Due to factors such as structure, there are temperature differences between different locations of the battery cell during charging and discharging. High-temperature areas may experience faster capacity decay due to accelerated chemical reactions, while low-temperature areas may experience insufficient output power due to reduced activity. This leads to a decrease in the charging and discharging efficiency of the battery cell and affects its cycle life.

[0030] In this application, based on the heat distribution at different locations on the first side 211, the filling density of the gas in the cavity 31 corresponding to different locations on the first side 211 can be adjusted. For example, the filling density of the gas in the cavity 31 corresponding to the lower temperature location on the first side 211 can be reduced, and the filling density of the gas in the cavity 31 corresponding to the higher temperature location on the first side 211 can be increased. This allows the higher temperature location on the first side 211 to dissipate heat quickly, thereby reducing the temperature difference between different locations on the battery cell 2 and making the overall temperature distribution of the battery cell 2 more uniform. This can improve the charging and discharging efficiency of the battery cell 2 and extend the cycle life of the battery cell 2.

[0031] In addition, the gas filling the cavity 31 is lightweight, which can reduce the impact on the overall weight of the battery device 100 and prevent gas leakage from causing pollution inside the battery device 100. Furthermore, the gas is readily available and has low operating costs.

[0032] According to the battery device 100 of the present invention, the temperature difference between different positions of the battery cell 2 can be reduced by adjusting the filling density of the gas in the cavity 31 corresponding to different positions of the first side 211 according to the heat distribution at different positions on the first side 211, so that the overall temperature distribution of the battery cell 2 is more uniform, thereby improving the charging and discharging efficiency of the battery cell 2 and extending the cycle life of the battery cell 2.

[0033] According to some embodiments of the present invention, the battery cell 2 includes a housing 21, an electrode assembly (not shown), and a terminal post 22. The electrode assembly is disposed within the housing 21, and the terminal post 22 is disposed within the housing 21 and located on at least one side of the housing 21 along a first direction. The side of the housing 21 facing the gasket 3 is a first side 211. A plurality of cavities 31 include a first cavity 311 and a second cavity 312 arranged along the first direction. The second cavity 312 is located on the side of the first cavity 311 away from the terminal post 22. The gas filling density in the first cavity 311 is greater than the gas filling density in the second cavity 312. That is, along the first direction, the distance between the first cavity 311 and the terminal post 22 is less than the distance between the second cavity 312 and the terminal post 22; that is, the first cavity 311 is closer to the terminal post 22 than the second cavity 312.

[0034] During battery charging and discharging, the temperature at the terminal 22 is higher than that at other locations in the battery cell 2 due to factors such as high contact resistance and high current density. Therefore, by increasing the filling density of the gas in the first cavity 311, the number of gas molecules per unit volume in the first cavity 311 can be significantly increased. This improves the thermal conductivity at the location of the first cavity 311, allowing the heat from the terminal 22 of the battery cell 2 to be quickly transferred outward through the area corresponding to the first cavity 311 via the gasket 3. In other words, it improves the heat dissipation efficiency at the terminal 22, thereby reducing the temperature difference between the terminal 22 and other locations in the battery cell 2 and making the temperature distribution more uniform across different locations in the battery cell 2.

[0035] According to some embodiments of the present invention, the electrode post 22 includes a positive electrode post 22a and a negative electrode post 22b, which are located on the same side of the housing 21 along a first direction. The first cavity 311 is provided with a plurality of cavities, including a positive cavity 311a and a negative cavity 311b, which are arranged along a second direction perpendicular to the first direction. The first side surface 211 includes a first region 2111 and a second region 2112 arranged along the first direction. The second region 2112 is located on the side of the first region 2111 away from the electrode post 22. The positive cavity 311a and the negative cavity 311b are located in the first region 2111, and the second cavity 312 is located in the second region 2112. Along the first direction, the size L1 of the first region 2111 and the size L2 of the second region 2112 satisfy: 1.5≤L2 / L1≤3.

[0036] In other words, along the first direction, the area on the first side 211 covered by the second cavity 312 is larger than the area on the first side 211 covered by the first cavity 311, and the ratio of L2 to L1 is controlled within the range of 1.5 to 3. For example, the ratio of L2 to L1 can be 1.5, 1.6, 1.7, 1.8, 2, 2.3, 2.5, 2.8, 3, etc. It can be understood that the larger the ratio of L2 to L1, the more area on the first side 211 is covered by the second cavity 312, and the less area on the first side 211 is covered by the first cavity 311. If the coverage area of ​​the first cavity 311 is too small, it will affect the heat dissipation efficiency at the electrode post 22. On the other hand, the smaller the ratio of L2 to L1, the less area is covered by the second cavity 312, and the more coverage area of ​​the first cavity 311. This will cause the area on the battery cell 2 other than the electrode post 22 to dissipate heat quickly through the first cavity 311, which is not conducive to the uniform temperature distribution at different locations of the battery cell 2. Therefore, by controlling the ratio of L2 to L1 within the range of 1.5 to 3, uneven temperature distribution of the battery cell 2 caused by the area covered by the first cavity 311 being too large or too small can be avoided, thereby reducing the temperature difference between different positions of the battery cell 2 and improving the charging and discharging efficiency and cycle life of the battery cell 2.

[0037] It should be noted that there may be only one positive electrode cavity 311a and one negative electrode cavity 311b. That is, there may be only one large positive electrode cavity 311a on the gasket 3 corresponding to the position of the positive electrode post 22a, and only one large negative electrode cavity 311b on the gasket 3 corresponding to the position of the negative electrode post 22b. Alternatively, there may be multiple positive electrode cavities 311a and multiple small positive electrode cavities 311a on the gasket 3 corresponding to the position of the positive electrode post 22a, and multiple small positive electrode cavities 311a on the gasket 3 corresponding to the position of the negative electrode post 22b. There are no specific restrictions on the number and arrangement of the positive electrode cavities 311a and the negative electrode cavities 311b.

[0038] According to some embodiments of the present invention, the electrode post 22 includes a positive electrode post 22a and a negative electrode post 22b, which are located on opposite sides of the housing 21 along a first direction. A first cavity 311 is provided with a plurality of cavities, including a positive cavity 311a and a negative cavity 311b, which are located on opposite sides of a second cavity 312 along the first direction. A first side surface 211 includes a third region 2113, a fourth region 2114, and a fifth region 2114 arranged along the first direction. Region 2115, third region 2113 and fifth region 2115 are located on opposite sides of fourth region 2114 along the first direction. Positive electrode cavity 311a is located in third region 2113, second cavity 312 is located in fourth region 2114, negative electrode cavity 311b is located in fifth region 2115. Along the first direction, the dimensions L3 of third region 2113, L4 of fourth region 2114 and L5 of fifth region 2115 satisfy: 3≤L4 / L3≤5; 3≤L4 / L5≤5.

[0039] In other words, along the first direction, the area covered by the second cavity 312 on the first side 211 is larger than the area covered by the positive electrode cavity 311a on the first side 211 and larger than the area covered by the negative electrode cavity 311b on the first side 211, and the ratio of L4 to L3 and the ratio of L4 to L5 are controlled within the range of 3 to 5. For example, the ratio of L4 to L3 can be 3, 3.2, 3.5, 3.8, 4, 4.3, 4.5, 4.8, 5, etc., and the ratio of L4 to L5 can be 3, 3.2, 3.5, 3.8, 4, 4.3, 4.5, 4.8, 5, etc. It is understandable that the larger the ratio of L4 to L3 and the ratio of L4 to L5, the more area on the first side 211 is covered by the second cavity 312, and the less area on the first side 211 is covered by the positive electrode cavity 311a and the negative electrode cavity 311b. If the coverage area of ​​the positive electrode cavity 311a and the negative electrode cavity 311b is too small, it will affect the heat dissipation efficiency of the electrode post 22. On the other hand, the smaller the ratio of L4 to L3 and the ratio of L4 to L5, the less area is covered by the second cavity 312, and the more coverage area of ​​the first cavity 311. This will cause the area on the battery cell 2 other than the electrode post 22 to be able to dissipate heat through the positive electrode cavity 311a and the negative electrode cavity 311b, which is not conducive to the uniform temperature distribution at different locations of the battery cell 2. Therefore, by controlling the ratio of L4 to L3 and the ratio of L4 to L5 within the range of 3 to 5, the uneven temperature distribution of the battery cell 2 caused by the area covered by the positive electrode cavity 311a and the negative electrode cavity 311b being too large or too small can be avoided, thereby reducing the temperature difference between different positions of the battery cell 2 and improving the charging and discharging efficiency and cycle life of the battery cell 2.

[0040] According to some embodiments of the present invention, the electrode post 22 includes a positive electrode post 22a and a negative electrode post 22b. The resistance of the positive electrode post 22a is greater than the resistance of the negative electrode post 22b. The first cavity 311 is provided with multiple cavities, including a positive cavity 311a and a negative cavity 311b. The positive cavity 311a is located on the side of the second cavity 312 near the positive electrode post 22a, and the negative cavity 311b is located on the side of the second cavity 312 near the negative electrode post 22b. The filling density of the gas in the positive cavity 311a is greater than the filling density of the gas in the negative cavity 311b. Because the resistance of the positive electrode post 22a is greater than the resistance of the negative electrode post 22b, the heat generated by the positive electrode post 22a is greater than the heat generated by the negative electrode post 22b during charging and discharging. Therefore, by increasing the filling density of the gas in the positive electrode cavity 311a, the heat dissipation performance of the area of ​​the pad 3 corresponding to the positive electrode post 22a can be improved, so that the area of ​​the positive electrode post 22a can dissipate heat more quickly, and the temperature of the area of ​​the positive electrode post 22a is closer to the temperature of the negative electrode post 22b. This can reduce the temperature difference between different positions of the battery cell 2, thereby improving the charging and discharging efficiency and cycle life of the battery cell 2.

[0041] According to some embodiments of the present invention, the battery device 100 further includes a cold plate, the terminal post 22 includes a positive terminal post 22a and a negative terminal post 22b, the positive terminal post 22a and the negative terminal post 22b are located on one side of the housing 21 along a first direction, the cold plate is located on the other side of the housing 21 along the first direction, and a plurality of second cavities 312 include a central cavity 312a and an edge cavity 312b, the central cavity 312a is located in the middle of the first side surface 211, and the edge cavity 312b is located on the side of the central cavity 312a away from the first cavity 311, and the filling density of the gas in the central cavity 312a is greater than the filling density of the gas in the edge cavity 312b.

[0042] The cooling plate absorbs and carries away heat from the surrounding environment, thus cooling the battery cell 2. For example, the cooling plate can be a liquid cooling plate. Positioning the cooling plate on the other side of the casing 21 ensures that the end of the battery cell 2 furthest from the positive electrode post 22a and the negative electrode post 22b along the first direction has a lower temperature. Therefore, by reducing the gas density within the edge cavity 312b, both the first cavity 311 and the central cavity 312a have better heat dissipation performance than the edge cavity 312b, allowing for more efficient heat dissipation in the central region of the battery cell 2 and the post 22 region.

[0043] In other words, the filling density of the gas in multiple cavities 31 can be flexibly adjusted according to the position of the cold plate. The closer to the cold plate, the lower the temperature, and the lower the filling density of the gas in the cavity 31 can be. This can reduce the temperature difference between different positions of the battery cell 2 along the first direction, thereby improving the charging and discharging efficiency and cycle life of the battery cell 2.

[0044] It should be noted that there may be only one central cavity 312a and one edge cavity 312b. That is, there may be only one large central cavity 312a on the gasket 3 at the position corresponding to the middle of the first side 211, and only one large edge cavity 312b on the gasket 3 at the position corresponding to the end of the first side 211 away from the pole post 22. Alternatively, there may be multiple central cavities 312a and multiple small central cavities 312a on the gasket 3 at the position corresponding to the middle of the first side 211, and multiple small central cavities 312a at the position corresponding to the end of the first side 211 away from the pole post 22. There are no specific restrictions on the number and arrangement of the central cavity 312a and the edge cavity 312b.

[0045] Of course, when there is a significant temperature difference between different positions of the first side 211 along the second direction, such as when the temperature at both ends of the first side 211 along the second direction is lower and the temperature in the middle position is higher, a cavity 31 can be provided on both sides of the middle cavity 312a along the second direction, and the filling density of the gas in the cavity 31 can be controlled to be less than the filling density of the gas in the middle cavity 312a, etc.

[0046] According to some embodiments of the present invention, such as Figure 2 As shown, the first side 211 includes a second region 2112, and a second cavity 312 is disposed within the second region 2112. The second region 2112 includes a first sub-region and a second sub-region arranged along a first direction. The second sub-region is located on the side of the first sub-region away from the pole post 22. The central cavity 312a is disposed within the first sub-region, and the edge cavity 312b is disposed within the second sub-region. Along the first direction, the size of the first sub-region is larger than the size of the second sub-region. The size L6 of the first sub-region and the size L7 of the second sub-region satisfy: 3≤L6 / L7≤5.

[0047] In other words, along the first direction, the area covered by the central cavity 312a on the first side 211 is larger than the area covered by the edge cavity 312b on the first side 211, and the ratio of L6 to L7 is controlled within the range of 3 to 5. For example, the ratio of L6 to L7 can be 3, 3.2, 3.5, 3.8, 4, 4.3, 4.5, 4.8, 5, etc. Therefore, by controlling the ratio of L6 to L7 within the range of 3 to 5, uneven temperature distribution of the battery cell 2 caused by the central cavity 312a being too large or too small can be avoided, thereby reducing the temperature difference between different positions of the battery cell 2 and improving the charge and discharge efficiency and cycle life of the battery cell 2.

[0048] According to some embodiments of the present invention, the battery cell 2 is a square battery, and at least one spacer 3 is provided between any two adjacent battery cells 2 arranged along the thickness direction of the battery cell 2. Thus, along the thickness direction of the battery cell 2, the spacer 3 can effectively separate any two adjacent battery cells 2, thereby preventing heat transfer through contact between adjacent battery cells 2 and achieving effective control of thermal runaway. Furthermore, the battery cells 2 on both sides can simultaneously undergo differentiated heat insulation treatment in different areas through multiple cavities 31 on the spacer 3 between them, which can reduce the number of spacers 3 and lower the cost of differentiated heat insulation treatment.

[0049] According to some embodiments of the present invention, such as Figure 4 As shown, a heat insulation sheet 4 is provided between two adjacent battery cells 2, and a gasket 3 is provided between the heat insulation sheet 4 and the battery cells 2 located on opposite sides of the heat insulation sheet 4. That is, the gasket 3 is located between the battery cell 2 and the heat insulation sheet 4. The heat insulation sheet 4 prevents heat transfer between the battery cells 2 on both sides, while the gasket 3 effectively achieves differentiated heat dissipation in different areas of the first side 211. Therefore, through the cooperation of the heat insulation sheet 4 and the gasket 3, the temperature of different areas of the battery cell 2 can be evenly distributed while ensuring the heat insulation effect.

[0050] According to some embodiments of the present invention, the filling gas is a flame-retardant gas or an inert gas. Therefore, when the battery device 100 experiences thermal runaway, the flame-retardant gas or inert gas in the cavity 31 is released into the housing 1, which can effectively prevent the spread of fire within the housing 1 and has a good flame-retardant effect. In some embodiments, the filling gas can be nitrogen, carbon dioxide, or argon, etc., as long as the filling gas has a good flame-retardant effect.

[0051] According to some embodiments of the present invention, the gasket 3 is a rubber part or a ceramic fiber part. The gasket 3 can be a rubber part, ensuring that the gasket 3 has a certain elasticity and can form a good buffering effect between the battery cells 2; the gasket 3 can also be a ceramic limiting part, ensuring that the gasket 3 has good hardness and can prevent the cavity 31 from deforming due to changes in the filling density of the internal filling gas, thereby better maintaining the shape of the cavity 31.

[0052] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0053] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0054] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery device, characterized in that, include: Box; Multiple battery cells are disposed within the housing. At least some adjacent battery cells are provided with a gasket. Multiple cavities are formed in the gasket and spaced apart from each other. The side of the battery cell facing the gasket is a first side. The gasket abuts against the first side. The multiple cavities are distributed at different positions on the first side. Each cavity is filled with a filling gas, and the filling density of the filling gas in at least some of the cavities is different.

2. The battery device according to claim 1, characterized in that, The battery cell includes a housing, an electrode assembly, and a terminal post. The electrode assembly is disposed inside the housing, and the terminal post is disposed in the housing and located on at least one side of the housing along a first direction. The side of the housing facing the gasket is the first side. The plurality of cavities include a first cavity and a second cavity arranged along the first direction. The second cavity is located on the side of the first cavity away from the terminal post. The filling density of the gas in the first cavity is greater than the filling density of the gas in the second cavity.

3. The battery device according to claim 2, characterized in that, The electrode post includes a positive electrode post and a negative electrode post, which are located on the same side of the housing along the first direction. The first cavity is provided with multiple positive and negative cavities, which are arranged along a second direction perpendicular to the first direction. The first side includes a first region and a second region arranged along the first direction. The second region is located on the side of the first region away from the electrode post. The positive and negative cavities are located in the first region, and the second cavity is located in the second region. Along the first direction, the size L1 of the first region and the size L2 of the second region satisfy: 1.5 ≤ L2 / L1 ≤ 3.

4. The battery device according to claim 2, characterized in that, The electrode post includes a positive electrode post and a negative electrode post, which are located on opposite sides of the housing along the first direction. The first cavity has multiple positive and negative cavities, which are located on opposite sides of the second cavity along the first direction. The first side includes a third region, a fourth region, and a fifth region arranged along the first direction. The third and fifth regions are located on opposite sides of the fourth region along the first direction. The positive electrode cavity is located in the third region, the second cavity is located in the fourth region, and the negative electrode cavity is located in the fifth region. Along the first direction, the dimensions L3 of the third region, L4 of the fourth region, and L5 of the fifth region satisfy: 3≤L4 / L3≤5; 3≤L4 / L5≤5.

5. The battery device according to claim 2, characterized in that, The electrode post includes a positive electrode post and a negative electrode post. The resistance of the positive electrode post is greater than that of the negative electrode post. The first cavity is provided with multiple cavities, including a positive cavity and a negative cavity. The positive cavity is located on the side of the second cavity near the positive electrode post, and the negative cavity is located on the side of the second cavity near the negative electrode post. The filling density of the gas in the positive cavity is greater than that in the negative cavity.

6. The battery device according to claim 2, characterized in that, It also includes a cold plate, the poles include a positive pole and a negative pole, the positive pole and the negative pole are located on one side of the housing along the first direction, the cold plate is located on the other side of the housing along the first direction, the plurality of second cavities include a central cavity and an edge cavity, the central cavity is located in the middle of the first side, the edge cavity is located on the side of the central cavity away from the first cavity, and the filling density of the gas in the central cavity is greater than the filling density of the gas in the edge cavity.

7. The battery device according to claim 6, characterized in that, The first side includes a second region, and the second cavity is disposed within the second region. The second region includes a first sub-region and a second sub-region arranged along the first direction. The second sub-region is located on the side of the first sub-region away from the pole post. The central cavity is disposed within the first sub-region, and the edge cavity is disposed within the second sub-region. Along the first direction, the size of the first sub-region is larger than the size of the second sub-region. The size L6 of the first sub-region and the size L7 of the second sub-region satisfy: 3≤L6 / L7≤5.

8. The battery device according to any one of claims 1-7, characterized in that, The battery cell is a square battery, and at least one spacer is provided between any two adjacent battery cells arranged along the thickness direction of the battery cell.

9. The battery device according to any one of claims 1-7, characterized in that, A heat insulation sheet is provided between two adjacent battery cells, and a gasket is provided between the heat insulation sheet and the battery cells located on opposite sides of the heat insulation sheet.

10. The battery device according to any one of claims 1-7, characterized in that, The filling gas is a flame-retardant gas or an inert gas.

11. The battery device according to any one of claims 1-7, characterized in that, The gasket is made of rubber or ceramic fiber.

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