An elastic pressing device, a battery module, a battery pack and a power utilization device

Abstract

Embodiments of the present application provide an elastic pressing device, a battery module, a battery pack and a power utilization device. The elastic pressing device comprises a first shell and a second shell. The elastic pressing device is used in the battery pack, and the second shell is movably arranged on the first shell along a first direction, so that the size of the elastic pressing device in the first direction can be changed. According to the elastic pressing device of the present application, the elastic pressing device can apply a constraint force to the battery cell, reduce the transmission resistance of ions in the battery cell, thereby improving the charge and discharge performance of the battery pack. The elastic pressing device can also be adaptively adjusted according to the state of the battery cell. When the battery cell expands, the first shell and the second shell can absorb the displacement generated by the expansion of the battery cell, avoiding the deformation or damage of the battery pack caused by the expansion of the battery cell, thereby improving the reliability and safety of the battery pack and prolonging the service life of the battery pack.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to an elastic pressurization device, a battery module, a battery pack, and an electrical device. Background Technology

[0002] In related technologies, during the charge-discharge cycle of a battery pack, the cells within the pack expand. This continuous expansion of the cells puts pressure on the battery pack's casing and encapsulation structure, potentially leading to casing rupture, seal failure, or even safety issues. If space is directly reserved for cell expansion, it will result in poorer contact between the electrodes and the electrolyte, increasing ion transport resistance and thus reducing battery pack performance. Utility Model Content

[0003] This application provides an elastic pressurization device designed to improve the problem of cell volume expansion within a battery pack.

[0004] This application also proposes a battery module, which includes the aforementioned elastic pressurization device.

[0005] This application also proposes a battery pack including the aforementioned elastic pressurization device.

[0006] This application also proposes an electrical device comprising the aforementioned battery pack.

[0007] An elastic pressurizing device according to an embodiment of this application includes: a first housing and a second housing. The elastic pressurizing device is used for a battery pack, and the second housing is movably disposed on the first housing along a first direction, such that the dimension of the elastic pressurizing device in the first direction can be changed.

[0008] According to the embodiments of this application, the elastic pressurizing device, when used in a battery pack, can apply a constraining force to the battery cells, reducing the transport resistance of ions within the cells and thus improving the charge and discharge performance of the battery pack. By movably mounting the second housing on the first housing along a first direction, the dimensions of the elastic pressurizing device in the first direction can be changed, allowing the device to adaptively adjust according to the state of the battery cells. When a battery cell expands, the first and second housings can absorb the displacement caused by the expansion, preventing deformation or damage to the battery pack due to cell expansion, thereby improving the reliability and safety of the battery pack and extending its service life.

[0009] In addition, the elastic pressurizing device according to this application may also have the following additional technical features:

[0010] In some embodiments of this application, the elastic pressurizing device further includes an elastic device that extends along the first direction, one end of the elastic device being connected to the first housing and the other end of the elastic device being connected to the second housing, the elastic device being used to drive the first housing and the second housing to move in a direction away from each other.

[0011] In this application, by setting an elastic device, the elasticity and buffering performance of the elastic pressurization device can be realized, thereby enabling the elastic pressurization device to adaptively adjust according to the state of the battery cell.

[0012] In some embodiments of this application, the first housing has a receiving groove on the side of the first housing near the second housing along the first direction, and at least a portion of the second housing is disposed in the receiving groove.

[0013] In this application, by setting a receiving groove, the second housing can be moved within the receiving groove, and the structure is simple and the design is reasonable.

[0014] In some embodiments of this application, the first housing and the second housing are slidably connected. The first housing is provided with a protrusion, and the second housing is provided with a groove that cooperates with the protrusion. There are multiple protrusions and grooves that correspond one-to-one. The grooves extend along a first direction, and the protrusions are movable within the grooves.

[0015] In this application, the relative movement of the first housing and the second housing in a first direction can be achieved by sliding the first housing and the second housing relative to each other, resulting in a simple structure and reasonable design.

[0016] In some embodiments of this application, both the first housing and the second housing are cuboid structures.

[0017] In this application, by forming the elastic pressure device into a cuboid structure, similar in shape to the battery cell, it is convenient to flexibly arrange the elastic pressure device in various positions within the battery pack. This also allows the elastic pressure device to better cooperate with the battery cell, increasing the connection or contact area between the elastic pressure device and the battery cell. Therefore, the elastic pressure device can more evenly apply the constraint force in the first direction to the battery cell, thereby reducing the local stress on the battery cell.

[0018] In some embodiments of this application, the outer surfaces of the first housing and the second housing are provided with insulating coatings; and / or, the outer surfaces of the first housing and the second housing opposite to each other along a first direction are connected with heat insulation layers for heat insulation.

[0019] In this application, by setting an insulating coating, the risks of short circuits between battery cells can be avoided, thereby improving the reliability and safety of the battery pack. The heat insulation layer can isolate multiple battery cells and separate the first housing and / or the second housing from the battery cells. When one of the battery cells experiences thermal runaway, the heat insulation layer can prevent the spread of heat from the battery cell, thereby improving the reliability and safety of the battery pack.

[0020] This application also provides a battery module having the elastic pressure device described in the above embodiments, comprising: a protective shell, a plurality of battery cells, and the elastic pressure device described above. The plurality of battery cells are disposed within the protective shell and arranged along a first direction. The elastic pressure device is disposed within the protective shell, and the elastic pressure device and the battery cells are arranged along the first direction.

[0021] According to the battery module of this application embodiment, by disposing of an elastic pressurizing device within the battery module, the elastic pressurizing device can apply a constraining force to the battery cell, thereby reducing the transport resistance of ions within the battery cell and improving the charge and discharge performance of the battery pack. By movably disposing of the second housing on the first housing along a first direction, the size of the elastic pressurizing device in the first direction can be changed, allowing the elastic pressurizing device to adaptively adjust according to the state of the battery cell. When the battery cell expands, the first and second housings can absorb the displacement caused by the expansion, preventing deformation or damage to the battery module and battery pack due to cell expansion, thereby improving the reliability and safety of the battery pack and extending its service life.

[0022] In some embodiments of this application, the elastic pressurizing device is disposed between two adjacent battery cells, and / or, the elastic pressurizing device is disposed between the battery cell at the far end in the first direction and the housing.

[0023] In this application, by flexibly arranging the position of the elastic pressurizing device within the battery module, the expansion displacement of the battery cell can be absorbed at different positions. This allows the positive and negative electrodes and electrolyte inside the battery cell to make better and closer contact, reducing the ion transport resistance within the battery cell, thereby improving the charging and discharging performance of the battery module. It can also prevent the protective shell from deforming or being damaged due to excessive expansion force of the battery cell.

[0024] This application also provides a battery pack having the elastic pressurization device of the above embodiments, including: a housing, a plurality of battery cells, and the elastic pressurization device described above. The plurality of battery cells are disposed within the housing, and the plurality of battery cells are arranged along the first direction; the elastic pressurization device is disposed within the housing, and the elastic pressurization device is disposed between two adjacent battery cells, and / or, the elastic pressurization device is disposed between the battery cell located at the far end in the first direction and the housing.

[0025] According to the battery pack of this application embodiment, by providing the aforementioned elastic pressurizing device, and by disposing the elastic pressurizing device between adjacent cells or between a cell and the battery pack casing, the elastic pressurizing device can apply a constraining force to the cell, thereby reducing the ion transport resistance within the cell and improving the charge and discharge performance of the battery pack. By movably disposing the second casing on the first casing along the first direction, the size of the elastic pressurizing device in the first direction can be changed, allowing the elastic pressurizing device to adaptively adjust according to the state of the cell. When the cell expands, the first and second casings can absorb the displacement caused by the cell expansion, preventing battery pack deformation or damage due to cell expansion, thereby improving the reliability and safety of the battery pack and extending its service life.

[0026] This application also provides an electrical device having the battery pack described in the above embodiments.

[0027] According to the embodiments of this application, the electrical device, by providing an elastic pressurizing device inside the battery pack, allows the elastic pressurizing device to apply a restraining force to the battery cells, thereby reducing the transport resistance of ions within the cells and improving the charging and discharging performance of the battery pack. By movably mounting the second housing on the first housing along a first direction, the size of the elastic pressurizing device in the first direction can be changed, allowing the elastic pressurizing device to adaptively adjust according to the state of the battery cells. When the battery cells expand, the first and second housings can absorb the displacement caused by the expansion, preventing deformation or damage to the battery pack due to cell expansion, thereby improving the reliability and safety of the electrical device and extending its service life. Attached Figure Description

[0028] Figure 1 This is a perspective view of an elastic pressurizing device provided in an embodiment of this application;

[0029] Figure 2 This is a front view of an elastic pressurization device provided in an embodiment of this application;

[0030] Figure 3 This is a cross-sectional schematic diagram of an embodiment of the elastic pressurization device provided in this application;

[0031] Figure 4 This is a schematic diagram of a battery module provided in an embodiment of this application, wherein an elastic pressurizing device is disposed between adjacent battery cells;

[0032] Figure 5 This is a schematic diagram of a battery module provided in an embodiment of this application, wherein an elastic pressure device is disposed between the battery cell and the protective shell;

[0033] Figure 6 This is a schematic diagram of a battery pack provided in an embodiment of this application, wherein an elastic pressurizing device is disposed between adjacent battery cells;

[0034] Figure 7 This is a schematic diagram of a battery pack provided in an embodiment of this application, wherein an elastic pressurizing device is disposed between the battery cell and the protective shell.

[0035] Explanation of reference numerals in the attached figures:

[0036] 100. Elastic pressure device;

[0037] 1. First housing; 11. Receiving groove; 12. Protrusion;

[0038] 2. Second housing; 21. Slide groove;

[0039] 3. Elastic device;

[0040] 200. Battery module;

[0041] 4. Protective casing;

[0042] 5. Battery cells;

[0043] 6. Energy-absorbing components;

[0044] 300, battery pack;

[0045] 7. Outer shell;

[0046] 81. Battery management system; 82. Battery disconnection unit. Detailed Implementation

[0047] To make the technical problems, technical solutions, and beneficial effects solved by this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0048] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0049] 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 as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0050] In this utility model, 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 mechanical connection, an electrical connection, or a communication 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0051] The elastic pressure device 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0052] like Figures 1-3 As shown, the elastic pressurizing device 100 according to an embodiment of the present invention includes a first housing 1 and a second housing 2.

[0053] Specifically, such as Figure 1 As shown, combined with Figures 4-7 The elastic pressure device 100 is used in the battery pack 300, which has a housing 7 and multiple battery cells 5 inside the housing 7, which are arranged along a first direction. During the charging and discharging process, the battery cells 5 will expand, that is, the thickness of the battery cells 5 along the first direction will change when the battery pack 300 is in different states of charge.

[0054] The flexible pressurizing device 100 can be flexibly positioned within the battery pack 300. It can be located at at least one end of a plurality of battery cells 5 along a first direction, with one end of the device abutting or connecting to the cell 5. The device applies a constraint force away from the outer casing 7 to the cell 5. Alternatively, the device can be positioned between two adjacent cells 5, with both ends along the first direction abutting or connecting to the two adjacent cells 5, applying a constraint force away from each other to the two adjacent cells 5. This ensures close contact between the positive and negative electrodes and the electrolyte within the cell 5, reducing ion transport resistance within the cell 5 and thus improving the charge / discharge performance of the battery pack 300.

[0055] The second housing 2 is movably disposed on the first housing 1 along the first direction, so that the dimension of the elastic pressurizing device 100 in the first direction can be changed. It is understood that the relatively movable first housing 1 and second housing 2 enable the elastic pressurizing device 100 to have good elasticity and buffering performance, and can be adaptively adjusted according to the state of the battery cell 5.

[0056] When the battery cell 5 expands, the first housing 1 and the second housing 2 can adaptively move relative to each other, thereby adjusting the dimensions of the elastic pressurizing device 100 in the first direction and absorbing the displacement caused by the expansion of the battery cell 5. In this way, the elastic pressurizing device 100 can reserve space for the expansion of the battery cell 5, preventing deformation or damage to the outer casing 7 due to excessive expansion force of the battery cell 5. It can also effectively absorb external impacts and vibrations of the battery pack 300, protecting the battery cell 5 from mechanical damage, thereby improving the structural stability, reliability, and safety of the battery pack 300 and helping to extend the service life of the battery pack 300.

[0057] Furthermore, when the elastic pressure device 100 is located between two adjacent battery cells 5, the elastic pressure device 100 can isolate multiple battery cells 5. When one of the battery cells 5 experiences thermal runaway, the elastic pressure device 100 can prevent the thermal spread of the battery cell 5.

[0058] Compared to existing methods that sandwich foam between every two battery cells, the elastic pressurizing device 100 can avoid pressure decay caused by plastic deformation after long-term cyclic use. Compared to existing methods that dynamically adjust the constraint force between battery cells through fluid pressure, the elastic pressurizing device 100 does not pose safety risks such as liquid leakage and has a simple and easy-to-implement structure.

[0059] According to the embodiment of the present invention, the elastic pressurizing device 100, by being used in the battery pack 300, allows the elastic pressurizing device 100 to apply a constraining force to the battery cell 5, thereby reducing the transport resistance of ions within the battery cell 5 and improving the charging and discharging performance of the battery pack 300. By movably mounting the second housing 2 on the first housing 1 along a first direction, the size of the elastic pressurizing device 100 in the first direction can be changed, allowing the elastic pressurizing device 100 to adaptively adjust according to the state of the battery cell 5. When the battery cell 5 expands, the first housing 1 and the second housing 2 can absorb the displacement caused by the expansion of the battery cell 5, preventing deformation or damage to the battery pack 300 due to the expansion of the battery cell 5, thereby improving the reliability and safety of the battery pack 300 and extending its service life.

[0060] In some embodiments of this utility model, such as Figure 2 and Figure 3As shown, the elastic pressurizing device 100 also includes an elastic device 3, which extends along a first direction. One end of the elastic device 3 is connected to the first housing 1, and the other end of the elastic device 3 is connected to the second housing 2. The elastic device 3 is used to drive the first housing 1 and the second housing 2 to move in a direction away from each other.

[0061] The elastic device 3 can undergo elastic deformation when subjected to pressure and return to its original shape after the pressure is unloaded. This enables the elasticity and buffering performance of the elastic pressurization device 100, allowing for adaptive adjustment based on the state of the battery cell 5.

[0062] When the cell 5 expands, the elastic device 3 is subjected to pressure from the cell 5 along the first direction. The elastic device 3 can deform and store energy in the elastic deformation of its material. At the same time, the elastic device 3 drives the first housing 1 and the second housing 2 to move in a direction away from each other, so that the first housing 1 and / or the second housing 2 remain in contact with or connected to the cell 5, and provide a constraint force on the cell 5 in the first direction, so that the positive and negative electrodes and electrolyte inside the cell 5 are in close contact, thereby improving the charging and discharging performance of the battery pack 300.

[0063] When subjected to pressure generated by the expansion of the battery cell 5 or external impact pressure on the battery pack 300, the elastic structure releases energy through elastic recovery, thus achieving buffering and energy absorption, thereby improving the structural stability, reliability and safety of the battery pack 300, and helping to extend the service life of the battery pack 300.

[0064] In some embodiments, such as Figure 2 and Figure 3 As shown, there are multiple elastic devices 3 arranged at intervals, which can ensure the uniformity of force between the elastic device 3 and the first housing 1 and the second housing 2, while reducing stress.

[0065] In some embodiments, the elastic device 3 may be a steel elastic device, a pneumatic elastic device, or a hydraulic elastic device.

[0066] Preferably, the elastic device 3 is a steel elastic device, specifically a spring or a sheet, which ensures the function of the elastic pressure device 100 while having low cost, simple structure, and easy implementation. This simplifies the structure of the elastic device 3, ensuring elastic performance and elastic recovery capability while possessing high tensile strength, yield strength, and fatigue strength, thus contributing to a longer service life.

[0067] It should be noted that the compression amount of the elastic device 3 is 'a', and the thickness of the elastic pressure device 100 along the first direction is 'd', satisfying: 0 ≤ a ≤ d / 2. The stiffness coefficient of the elastic device 3 is 'k', and the pressure provided by the elastic device 3 is F = kx. The pressure range adaptable to the battery cell 5 within the battery pack 300 is [a, b]. The pressure applied by the elastic device 3 to the battery cell 5 can adapt to the performance conditions of the battery cell 5, i.e., satisfying: a ≤ F ≤ b. Therefore, the stiffness coefficient of the elastic device 3 can be determined based on the performance conditions of the battery cell 5, i.e., the pressure boundary required by the battery cell 5, so that the elastic device 3 can adapt to the performance of the battery cell 5, thereby improving the charging and discharging performance of the battery pack 300.

[0068] In some embodiments, the maximum compression of the elastic device 3 is x, and the maximum total expansion displacement of the plurality of cells 5 along the first direction is y, satisfying: x = cy, where 0.01 ≤ c ≤ 1. It can be understood that the maximum compression x of the elastic device 3 is less than or equal to the maximum total expansion displacement y of the plurality of cells 5 along the first direction. The cells 5 may have already undergone a small degree of expansion during the assembly process of the battery pack 300, while in the initial state immediately after assembly, the elastic device 3 is in a free state, i.e., the elastic device 3 has not been compressed. Therefore, in the actual application of the elastic pressurizing device 100 in the battery pack 300, the maximum compression of the elastic device 3 is less than or equal to the maximum total expansion displacement of the plurality of cells 5 along the first direction.

[0069] In some embodiments of this utility model, such as Figures 1-3 As shown, the first housing 1 has a receiving groove 11 on the side near the second housing 2 along the first direction, and at least a portion of the second housing 2 is disposed in the receiving groove 11. By providing the receiving groove 11, the second housing 2 can be moved within the receiving groove 11, and the structure is simple and the design is reasonable.

[0070] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the first housing 1 and the second housing 2 are slidably connected, allowing relative sliding between them. The first housing 1 has a protrusion 12, and the second housing 2 has a groove 21 that mates with the protrusion 12. There are multiple protrusions 12 and grooves 21 in a one-to-one correspondence. The grooves 21 extend along a first direction, and the protrusions 12 are movable within the grooves 21. This allows relative movement between the first housing 1 and the second housing 2 in the first direction, resulting in a simple and reasonable structure.

[0071] Specifically, such as Figure 1 and Figure 2As shown, the first housing 1 has a receiving groove 11 on the side near the second housing 2 along the first direction, and at least a portion of the second housing 2 is disposed in the receiving groove 11. The side wall of the receiving groove 11 of the first housing 1 has a plurality of protrusions 12, and the outer peripheral wall of the second housing 2 has a sliding groove 21 that mates with the plurality of protrusions 12. The sliding groove 21 extends along the first direction, and the plurality of sliding grooves 21 and the plurality of protrusions 12 correspond one-to-one. The protrusions 12 are movable within the sliding groove 21, thereby realizing a sliding connection between the first housing 1 and the second housing 2.

[0072] Furthermore, a limiting component is provided between the slide groove 21 and the protrusion 12 to cooperate with each other. For example, a limiting groove can be provided on the side wall of the slide groove 21, and at least part of the protrusion 12 is embedded in the limiting groove. This can prevent the protrusion 12 from coming out of the limiting groove and ensure the stability of the sliding connection between the first housing 1 and the second housing 2.

[0073] In some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, both the first housing 1 and the second housing 2 are cuboid structures. This cuboid structure of the elastic pressure device 100, similar in shape to the battery cell 5, facilitates flexible placement of the elastic pressure device 100 within the battery pack 300. It also allows for better cooperation between the elastic pressure device 100 and the battery cell 5, increasing the connection or contact area between them. Therefore, the elastic pressure device 100 can more evenly apply the constraint force in the first direction to the battery cell 5, thereby reducing localized stress. Furthermore, it ensures more uniform and tight contact between the positive and negative electrodes and the electrolyte inside the battery cell 5, further improving the charge and discharge performance of the battery pack 300, thus enhancing its structural stability, reliability, and safety, and extending its service life.

[0074] In some embodiments, the first housing 1 and the second housing 2 are made of aluminum alloy or steel, preferably aluminum alloy, which can reduce the weight of the first housing 1 and the second housing 2, thereby achieving a lightweight design of the elastic pressurizing device 100.

[0075] In some embodiments of this utility model, the outer surface of the first housing 1 and the outer surface of the second housing 2 are provided with an insulating coating, which can avoid the risk of short circuit between the cells 5 and improve the reliability and safety of the battery pack 300.

[0076] In some embodiments of this utility model, a heat insulation layer is connected to the surface of the first housing 1 and the second housing 2 on the side opposite to each other along a first direction for heat insulation. The heat insulation layer can isolate multiple battery cells 5, and at the same time isolate the first housing 1 and / or the second housing 2 from the battery cells 5. When one of the battery cells 5 experiences thermal runaway, the heat insulation layer can prevent the heat from spreading from the battery cell 5, thereby improving the reliability and safety of the battery pack 300.

[0077] Preferably, the heat insulation layer is a ceramic fiber aerogel layer, a glass fiber aerogel layer, or an aerogel layer.

[0078] The following describes a battery module 200 according to an embodiment of the present invention.

[0079] The battery module 200 according to an embodiment of the present invention includes: a protective shell 4, a plurality of battery cells 5 and the aforementioned elastic pressure device 100.

[0080] Specifically, such as Figure 4 and Figure 5 As shown, multiple battery cells 5 are disposed inside the protective shell 4, and the multiple battery cells 5 are arranged along the first direction. The elastic pressure device 100 is disposed inside the protective shell 4, and the elastic pressure device 100 and the battery cells 5 are arranged along the first direction.

[0081] According to the battery module 200 of this utility model embodiment, by providing an elastic pressure device 100 inside the battery module 200, the elastic pressure device 100 can apply a constraint force to the battery cell 5, thereby reducing the ion transport resistance within the battery cell 5 and improving the charging and discharging performance of the battery pack 300. By making the second housing 2 movably disposed on the first housing 1 along the first direction, the size of the elastic pressure device 100 in the first direction can be changed, allowing the elastic pressure device 100 to adaptively adjust according to the state of the battery cell 5. When the battery cell 5 expands, the first housing 1 and the second housing 2 can absorb the displacement caused by the expansion of the battery cell 5, avoiding deformation or damage to the battery module 200 and the battery pack 300 due to the expansion of the battery cell 5, thereby improving the reliability and safety of the battery pack 300 and extending its service life.

[0082] In some embodiments of this utility model, such as Figure 4 and Figure 5 As shown, the elastic pressure device 100 is disposed between two adjacent battery cells 5, and / or, the elastic pressure device 100 is disposed between the battery cell 5 at the far end in the first direction and the housing.

[0083] The position of the elastic pressure device 100 within the battery module 200 can be flexibly arranged. When the elastic pressure device 100 is located between the cell 5 at the far end in the first direction and the casing, one end of the elastic pressure device 100 abuts or connects to the cell 5 along the first direction, and the other end abuts or connects to the protective casing 4. The elastic pressure device 100 applies a constraint force to the cell 5 away from the protective casing 4. When the elastic pressure device 100 is located between two adjacent cells 5, both ends of the elastic pressure device 100 abut or connect to the two adjacent cells 5 respectively along the first direction. The elastic pressure device 100 applies a constraint force to the two adjacent cells 5 respectively, away from each other. This allows the positive and negative electrodes and electrolyte inside the cell 5 to be in close contact, reducing the ion transport resistance inside the cell 5, thereby improving the charging and discharging performance of the battery module 200. It can also absorb the displacement caused by the expansion of the cell 5 at different positions, preventing the protective casing 4 from deforming or being damaged due to excessive expansion force of the cell 5.

[0084] The following describes a battery pack 300 according to an embodiment of the present invention.

[0085] The battery pack 300 according to an embodiment of the present utility model includes: the battery module 200 described above.

[0086] like Figure 6 and Figure 7 As shown, the battery pack 300 includes a housing 7, and the battery module 200 is disposed inside the housing 7.

[0087] According to the embodiment of the present invention, the battery pack 300, by providing an elastic pressure device 100 within the battery module 200, allows the elastic pressure device 100 to apply a constraint force to the battery cell 5, thereby reducing the ion transport resistance within the battery cell 5 and improving the charging and discharging performance of the battery pack 300. By movably mounting the second housing 2 on the first housing 1 along a first direction, the size of the elastic pressure device 100 in the first direction can be changed, allowing the elastic pressure device 100 to adaptively adjust according to the state of the battery cell 5. When the battery cell 5 expands, the first housing 1 and the second housing 2 can absorb the displacement caused by the expansion of the battery cell 5, preventing deformation or damage to the battery module 200 and battery pack 300 due to the expansion of the battery cell 5, thereby improving the reliability and safety of the battery pack 300 and extending its service life.

[0088] In some embodiments, such as Figure 6 and Figure 7 As shown, the housing 7 also houses a battery management system 81 (BMS), which is responsible for monitoring, controlling and protecting the battery module 200 to ensure the safe and efficient operation of the battery pack 300.

[0089] In some embodiments, such as Figure 6 and Figure 7 As shown, the housing 7 also includes a battery disconnect unit 82 (BDU), which is responsible for connecting / disconnecting the high-voltage circuit and quickly cutting off the power supply in case of a battery pack 300 failure.

[0090] In some embodiments, an energy-absorbing element 6 is provided between the elastic pressurizing device 100 and the battery cell 5. The energy-absorbing element 6 is specifically foam or aerogel, which can further absorb the expansion displacement of the battery cell 5 and prevent the casing 7 from deforming or being damaged due to the expansion of the battery cell 5. It can also play a buffering role, preventing mechanical damage caused by hard collision between the elastic pressurizing device 100 and the battery cell 5, thereby improving the structural stability, reliability and safety of the battery pack 300 and helping to extend the service life of the battery pack 300.

[0091] The following describes a battery pack according to another embodiment of the present invention.

[0092] The battery pack according to an embodiment of the present invention includes: a housing 7, a plurality of battery cells 5 and the aforementioned elastic pressurizing device 100.

[0093] Specifically, multiple battery cells 5 are disposed inside the housing 7, and the multiple battery cells 5 are arranged along the first direction. An elastic pressure device 100 is disposed inside the housing 7, and the elastic pressure device 100 is disposed between two adjacent battery cells 5. And / or, an elastic pressure device 100 is provided between the battery cell 5 located at the far end in the first direction and the housing.

[0094] According to the battery pack of this utility model embodiment, by disposing of the elastic pressure device 100 between adjacent cells 5 or between the cell 5 and the battery pack casing, the elastic pressure device 100 can apply a constraint force to the cell 5, thereby reducing the ion transport resistance within the cell 5 and improving the charging and discharging performance of the battery pack. By movably disposing of the second casing 2 on the first casing 1 along the first direction, the size of the elastic pressure device 100 in the first direction can be changed, allowing the elastic pressure device 100 to adaptively adjust according to the state of the cell 5. When the cell 5 expands, the first casing 1 and the second casing 2 can absorb the displacement caused by the expansion of the cell 5, preventing the battery pack from deforming or being damaged due to the expansion of the cell 5, thereby improving the reliability and safety of the battery pack and extending its service life.

[0095] Other components and structures of the battery pack 300 according to the present invention, such as the battery management system 81 and the battery disconnection unit 82, are known to those skilled in the art and will not be described in detail here.

[0096] This application also includes an electrical device.

[0097] The electrical device according to an embodiment of the present invention includes: the battery pack 300 described above.

[0098] Electrical devices can be vehicles, aircraft, robots, etc.

[0099] According to the embodiment of this utility model, the electrical device, by providing an elastic pressure device 100 inside the battery pack 300, allows the elastic pressure device 100 to apply a constraint force to the battery cell 5, thereby reducing the ion transport resistance within the battery cell 5 and improving the charging and discharging performance of the battery pack 300. By movably mounting the second housing 2 on the first housing 1 along a first direction, the size of the elastic pressure device 100 in the first direction can be changed, allowing the elastic pressure device 100 to adaptively adjust according to the state of the battery cell 5. When the battery cell 5 expands, the first housing 1 and the second housing 2 can absorb the displacement caused by the expansion of the battery cell 5, preventing deformation or damage to the battery pack 300 due to the expansion of the battery cell 5, thereby improving the reliability and safety of the electrical device and extending its service life.

[0100] 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.

[0101] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An elastic compression device, characterized in that, For use in battery packs and including: First shell; A second housing is movably disposed on the first housing along a first direction, such that the dimensions of the elastic pressurizing device in the first direction can be changed.

2. The elastic compression device of claim 1, wherein, Also includes: An elastic device extends along the first direction, one end of the elastic device is connected to the first housing, and the other end of the elastic device is connected to the second housing. The elastic device is used to drive the first housing and the second housing to move in a direction away from each other.

3. The elastic compression device of claim 1, wherein, The first housing has a receiving groove on the side of the second housing along the first direction, and at least a portion of the second housing is disposed in the receiving groove.

4. The elastic compression device of claim 1, wherein, The first housing and the second housing are slidably connected. The first housing is provided with a protrusion, and the second housing is provided with a sliding groove that cooperates with the protrusion. There are multiple protrusions and sliding grooves that correspond one-to-one. The sliding groove extends along a first direction, and the protrusion is movable within the sliding groove.

5. The elastic compression device of claim 1, wherein, Both the first shell and the second shell are cuboid structures.

6. The elastic compression device of claim 1, wherein, The outer surfaces of the first housing and the second housing are provided with an insulating coating; And / or, the first housing and the second housing are connected to a heat insulation layer on the side surfaces opposite to each other along a first direction for heat insulation.

7. A battery module, characterized by include: Protective case; Multiple battery cells are disposed within the protective shell and arranged along the first direction; According to any one of claims 1-6, the elastic pressurizing device is disposed inside the protective shell, and the elastic pressurizing device and the battery cell are arranged along the first direction.

8. The battery module of claim 7, wherein, The elastic pressurizing device is disposed between two adjacent cells, and / or the elastic pressurizing device is disposed between the cell at the far end in the first direction and the housing.

9. A battery pack, characterized by, include: shell; Multiple battery cells are disposed within the housing and arranged along the first direction; The elastic pressurizing device according to any one of claims 1-6 is disposed within the housing, between two adjacent cells, and / or, between the cell at the far end in the first direction and the housing.

10. An electrical device, characterized by Includes the battery pack as described in claim 9.

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