Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device. The battery device comprises a battery monomer, an outer plate, an inner plate, an elastic piece and a connecting rod, the outer plate comprises a bottom plate and outer side plates oppositely arranged at the two ends of the bottom plate, and the outer side plates oppositely arranged at the two ends and the bottom plate enclose to form a containing cavity; the battery monomers are sequentially arranged in the accommodating cavity; the inner plate is arranged between the outer side plate and the battery monomer; a buffer cavity is formed between the inner plate and the outer side plate; the elastic piece is arranged in the buffer cavity; the outer side plate comprises a through hole, one end of the connecting rod penetrates through the through hole, and the other end of the connecting rod abuts against the inner plate. The connecting rod can move in the through hole so that the inner plate can compress the elastic piece to move towards one side of the outer side plate. The elastic piece is used for providing a buffer space when the battery monomers are expanded, so that the safety performance of the battery device can be improved.

Description

Technical Field

[0001] This application relates to the field of battery devices, and particularly to a battery device and an electrical device. Background Art

[0002] The power source of an electrical device is a battery pack. The battery cells in the battery pack age, and after aging, the battery cells expand in volume, causing poor pressure relief such as cracking of the housing of the battery pack, thus affecting the safety performance of the electrical device. Therefore, it is necessary to provide a buffer space for the volume expansion after the battery cells age to improve the safety performance of the battery pack. Utility Model Content

[0003] In view of this, this application provides a battery device and an electrical device, which provide a buffer space for the battery cells to improve the safety performance of the battery pack.

[0004] To solve the above technical problems, in a first aspect of this application, a battery device is provided. The battery device includes: battery cells; an outer plate, the outer plate includes a bottom plate and outer side plates oppositely arranged at both ends of the bottom plate, and the oppositely arranged outer side plates at both ends and the bottom plate enclose to form a receiving cavity; the battery cells are arranged in sequence in the receiving cavity; an inner plate, the inner plate is arranged between the outer side plate and the battery cells; a buffer cavity is formed between the inner plate and the outer side plate; an elastic member, arranged in the buffer cavity, connecting the outer plate and the inner plate, so that when the battery cells expand, the inner plate compresses the elastic member and moves towards the outer side plate; a connecting rod, the outer side plate includes a through hole, one end of the connecting rod is inserted through the through hole, and the other end of the connecting rod abuts against the inner plate; the connecting rod can move in the through hole to realize that the inner plate compresses the elastic member and moves towards the outer side plate.

[0005] In an embodiment of this application, an elastic member is arranged between the inner plate and the outer side plate in the battery device. When the battery cells expand, the inner plate can compress the elastic member and move towards the outer side plate. This design can provide a buffer space for the expansion of the battery cells, reduce the risk that the outer plate is subjected to excessive pressure due to the expansion of the battery cells, and further reduce the deformation or even rupture of the outer plate, improving the stability and safety of the overall structure of the battery device.

[0006] Furthermore, when a thermal runaway occurs in the battery cells, a large pressure relief peak pressure will be generated. The elastic member can buffer this pressure. The buffering effect of the elastic member can slow down the pressure relief speed, reduce the impact force generated by the instantaneous release of pressure on other components inside the battery device, and achieve minimizing the direct action of the pressure on the outer side plate, thereby effectively reducing the occurrence of the outer side plate cracking due to excessive pressure. At the same time, it also helps to reduce the situation where the internal pressure of the battery continues to be too high due to poor pressure relief. It helps to maintain the integrity of the battery device and reduce potential safety hazards.

[0007] The connecting rod is inserted through the through hole of the outer plate and abuts against the inner plate, providing precise guidance for the movement of the inner plate. When the battery cell expands or other situations occur, the inner plate compresses the elastic part and moves toward the outer plate, and the connecting rod allows the inner plate to move only along the axial direction of the connecting rod, reducing the shaking or deviation of the inner plate and improving the stability and reliability of the buffering process.

[0008] The connecting rod connects the outer plate and the inner plate, forming a stable connection structure inside the battery device. This helps to enhance the structural strength of the entire battery device, especially when the battery cell expands and generates a large pressure, the connecting rod can withstand a certain amount of tension and pressure, connecting the inner plate and the outer plate more tightly together, reducing the separation or deformation between the outer plate and the inner plate, and improving the overall structural stability and pressure resistance of the battery device.

[0009] According to one embodiment of the present application, the elastic member is sleeved on the connecting rod, and when the battery cell expands, the inner plate compresses the elastic member to drive the connecting rod to move toward the outer plate.

[0010] In the embodiment of the present application, the connecting rod provides a guiding direction for the compression and extension of the elastic member. When the inner plate moves due to the pressure of the battery cell expansion, the elastic member will be compressed along the axial direction of the connecting rod, ensuring that the elastic member can be evenly stressed and deformed, thereby more effectively exerting its buffering performance.

[0011] According to an embodiment of the present application, the elastic member includes one or more of a spring, a spring, rubber, and a sponge.

[0012] In the implementation manner of the present application, one or more of springs, shrapnel, rubber, and sponge can be flexibly selected for combination according to factors such as specific design requirements of the battery device, space limitations, cost budget, and expected buffering performance.

[0013] According to one embodiment of the present application, the connecting rod and the inner plate are designed as an integral whole.

[0014] In the embodiment of the present application, the connecting rod and the inner plate adopt an integrated design to eliminate the connection gap or interface between the connecting rod and the inner plate, so that the two form a continuous integral structure. In this way, when the pressure generated by the expansion of the battery cell is subjected to, the stress can be dispersed more evenly, and the risk of rupture and deformation caused by insufficient strength of the connection part can be reduced, thereby improving the structural stability and reliability of the entire battery device. At the same time, this design can reduce the loss and hysteresis in the energy transfer process, so that the elastic member can play a buffering role more timely and effectively.

[0015] According to an embodiment of the present application, on the side of the outer plate away from the inner plate, there is also a first mounting groove located on the outer circle of the through hole; the battery device further includes a fastener, which is arranged in the first mounting groove and fixed on the connecting rod to fix the relative positions of the outer plate and the inner plate.

[0016] In the embodiment of the present application, the first mounting groove provides a precise mounting position for the fastener, enabling it to be accurately fixed on the connecting rod, thereby precisely defining the relative positions of the outer plate and the inner plate.

[0017] According to an embodiment of the present application, on the side of the outer plate close to the inner plate, there is also a second mounting groove located on the outer circle of the through hole; the battery device further includes a first sealing member and a second sealing member. The first sealing member is arranged in the first mounting groove on the side of the fastener close to the inner plate, and the second sealing member is arranged in the second mounting groove on the side of the elastic member close to the outer plate.

[0018] In the embodiment of the present application, the first sealing member is located in the first mounting groove on the side of the fastener close to the inner plate, which can effectively reduce the entry of external pollutants such as dust and water vapor into the interior of the battery device through the connection between the fastener and the outer plate. The second sealing member is arranged in the second mounting groove on the side of the elastic member close to the outer plate, which can effectively reduce the entry of external substances from the gap between the elastic member and the outer plate. This helps to improve the cleanliness inside the battery device, reduce problems such as a decline in battery performance and short circuits caused by the intrusion of external impurities, and extend the service life of the battery.

[0019] According to an embodiment of the present application, the thickness of the inner plate is less than or equal to the thickness of the outer plate.

[0020] In the embodiment of the present application, the thickness of the inner plate is less than the thickness of the outer plate. In the case where the internal space of the battery device is limited, the relatively thin inner plate can create more space for the battery cells or other components, which is beneficial to improving the energy density of the battery device.

[0021] The thickness of the inner plate is equal to the thickness of the outer plate. This can further improve the rigidity of the battery device. The inner plate and the outer plate with the same thickness build a more stable support system inside the battery device.

[0022] According to an embodiment of the present application, the material of the inner plate is the same as the material of the outer plate.

[0023] In the embodiment of the present application, when the inner plate and the outer plate adopt the same corrosion-resistant material, they have the same corrosion resistance when facing water vapor, acids, alkalis and other corrosive substances in the external environment, can simultaneously resist the corrosion effect, protect the internal structure and components of the battery device from corrosion, improve the weather resistance and reliability of the battery device, and extend its overall service life.

[0024] According to an embodiment of the present application, a battery cell includes a housing, an electrode assembly located inside the housing, and a cover plate covering the open end of the housing. The housing is filled with an electrolyte; the electrode assembly includes a negative electrode plate, a positive electrode plate, and a separator disposed between the negative electrode plate and the positive electrode plate.

[0025] In a second aspect of the present application, there is also provided an electrical device. The electrical device includes the battery device described in any one of the above, and the battery device is used to provide electrical energy. Since the electrical device includes the above-mentioned battery device, the electrical device has the same effects as the above battery device.

[0026] The beneficial effects of the present application are as follows: The present application provides a battery device, which includes an outer plate, an inner plate, and an elastic member. The outer plate includes a bottom plate and outer side plates oppositely disposed at both ends of the bottom plate; the inner plate is disposed between the outer side plate and the battery cell; a buffer cavity is formed between the inner plate and the outer side plate; the elastic member is disposed in the buffer cavity and connects the outer plate and the inner plate. When the battery cell expands, the inner plate compresses the elastic member and moves toward the outer side plate. The present application uses the elastic member to provide a buffer space for the battery cell, which can improve the safety performance of the battery device. Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. Among them:

[0028] Figure 1 It is a schematic structural diagram of a vehicle according to one or more embodiments;

[0029] Figure 2 It is a schematic structural diagram of a battery cell according to one or more embodiments;

[0030] Figure 3 It is a schematic top view structural diagram of a battery device according to one or more embodiments;

[0031] Figure 4 It is Figure 3 The schematic cross-sectional structure diagram of A-A in

[0032] In the figure: 100, battery device; 11, battery cell; 12, outer plate; 13, inner plate; 14, buffer cavity; 15, elastic member; 121, bottom plate; 122, outer side plate; 123, accommodation cavity; 16, connecting rod; 1222, first installation groove; 17, fastener; 1223, second installation groove; 111, housing; 112, electrode assembly; 113, cover plate; 1000, vehicle; 200, controller; 300, motor. Detailed Embodiments

[0033] Hereinafter, embodiments of the technical solution of the present application will be described in detail. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and thus are only examples and cannot be used to limit the protection scope of the present application.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0035] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, unless otherwise specifically defined, the term "plurality" means two or more (including two). Similarly, "multiple groups" means two or more groups (including two groups), and "multiple pieces" means two or more pieces (including two pieces).

[0036] Referring to "embodiments" herein means that specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0037] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0038] In the description of the embodiments of this application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of this application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the embodiments of this application.

[0039] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0040] At present, from the perspective of the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as military equipment and aerospace. With the continuous expansion of the battery application field, the market demand is also continuously increasing.

[0041] In the related art, the outer shell side plate of the battery pack is set in the form of a combination of a metal material main board and a non-metal composite material auxiliary board, but there is no buffer structure between the metal material main board and the non-metal composite material auxiliary board, and the buffer effect at the outer shell side plate is not good. And at the same thickness, the strength of the non-metal composite material auxiliary board is lower than that of the all-metal material main board.

[0042] Based on the above considerations, in order to solve the technical problems of low buffer effect and low strength of the outer shell side plate in the prior art, the present application proposes a battery device and an electric device. The outer shell side plate of the battery device is divided into an outer plate and an inner plate, and an elastic member is provided between the outer side plate of the outer plate and the inner plate to provide an expansion force buffer space for the battery cells accommodated in the battery device and improve the safety performance of the battery device.

[0043] For the convenience of description in the following embodiments, a vehicle as an electric device in an embodiment of the present application is taken as an example for description.

[0044] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a vehicle according to one or more embodiments.

[0045] The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. A battery device 100 is disposed inside the vehicle 1000. The battery device 100 can be disposed at the bottom, the head, or the tail of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000. For example, the battery device 100 can serve as the operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0046] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0047] To improve the performance of the electrical device, the present application provides a battery device and an electrical device. Please refer to Figure 2 , Figure 3 , Figure 4 . Figure 2 It is a schematic structural diagram of a battery cell according to one or more embodiments. Figure 3 It is a schematic top view structural diagram of a battery device according to one or more embodiments. Figure 4 It is Figure 3 The schematic cross-sectional structure diagram taken along the A-A section in

[0048] The present application provides a battery device 100. The battery device 100 includes battery cells 11, an outer plate 12, an inner plate 13, and an elastic member 15. The outer plate 12 includes a bottom plate 121 and outer side plates 122 oppositely disposed at both ends of the bottom plate 121. The outer side plates 122 oppositely disposed at both ends and the bottom plate 121 enclose to form a receiving cavity 123. The battery cells 11 are arranged in sequence in the receiving cavity 123. The inner plate 13 is disposed between the outer side plates 122 and the battery cells 11. A buffer cavity 14 is formed between the inner plate 13 and the outer side plates 122. The elastic member 15 is disposed in the buffer cavity 14 and connects the outer plate 12 and the inner plate 13, so that when the battery cells 11 expand, the inner plate 13 compresses the elastic member 15 and moves toward the outer side plates 122.

[0049] In the embodiment of the present application, the bottom plate 121 of the outer plate 12 and the outer side plates 122 oppositely disposed at both ends enclose to form the receiving cavity 123, and the battery cells 11 are arranged in sequence in the receiving cavity 123. This kind of structural design reasonably utilizes the space, enables the battery cells 11 to be arranged compactly, can accommodate more battery cells 11 in a limited space, and improves the space utilization rate of the battery device 100.

[0050] During use, the battery cell 11 will expand to a certain extent. In the battery device 100, an elastic member 15 is provided between the inner plate 13 and the outer side plate 122. When the battery cell 11 expands, the inner plate 13 can compress the elastic member 15 and move towards the outer side plate 122. This design can provide a buffer space for the expansion of the battery cell 11, reduce the risk of excessive pressure on the outer plate 12 caused by the expansion of the battery cell 11, and further reduce the deformation or even rupture of the outer plate 12, improving the stability and safety of the overall structure of the battery device 100.

[0051] Among them, a buffer cavity 14 is formed between the inner plate 13 and the outer side plate 122. The buffer cavity 14 provides a deformation margin for the elastic member 15 and can also absorb external impact energy (such as mechanical collision, vibration) to protect the battery from instantaneous mechanical damage. When the battery device 100 is shaken or impacted, the elastic member 15 can absorb and buffer part of the energy, reducing the impact of vibration and shock on the battery cell 11. The inner plate 13 and the elastic member 15 work together to keep the battery cell 11 in a relatively stable state in a vibrating environment and also improve the seismic performance of the battery device 100, which is suitable for some usage scenarios with high vibration requirements.

[0052] Furthermore, when the battery cell 11 experiences thermal runaway, a large pressure relief peak pressure will be generated. The elastic member 15 can buffer this pressure. The buffering effect of the elastic member 15 can slow down the pressure relief speed, reduce the impact force generated by the instantaneous release of pressure on other components inside the battery device 100, and achieve minimizing the direct action of pressure on the outer side plate 122, thereby effectively reducing the occurrence of cracking of the outer plate 12 caused by excessive pressure. At the same time, it also helps to reduce the situation where the internal pressure of the battery remains too high due to poor pressure relief. It helps to maintain the integrity of the battery device 100, reduce potential safety hazards, and reduce the leakage of dangerous substances inside the battery cell 11 into the external environment, ensuring the safety of surrounding personnel and equipment.

[0053] According to an embodiment of the present application, the battery device 100 further includes a connecting rod 16. The outer side plate 122 includes a through hole (not shown in the figure). One end of the connecting rod 16 passes through the through hole, and the other end of the connecting rod 16 abuts against the inner plate 13; the connecting rod 16 can move in the through hole to enable the inner plate 13 to compress the elastic member 15 and move towards the outer side plate 122.

[0054] In the embodiment of the present application, the connecting rod 16 passes through the through hole of the outer plate 122 and abuts against the inner plate 13, providing precise guidance for the movement of the inner plate 13. When the battery cell 11 expands or in other situations where the inner plate 13 needs to compress the elastic member 15 and move towards the outer plate 122, the connecting rod 16 enables the inner plate 13 to move only along the axial direction of the connecting rod 16, reducing the situation of the inner plate 13 shaking or shifting, and improving the stability and reliability of the buffering process.

[0055] When the battery cell 11 expands and applies pressure to the inner plate 13, the connecting rod 16 can evenly transfer the pressure to the outer plate 122. Since the connecting rod 16 abuts against the inner plate 13 and can move in the through hole, the pressure received by the inner plate 13 can be more evenly dispersed to various parts of the outer plate 122 through the connecting rod 16, reducing the situation of excessive local pressure and further protecting the structural integrity of the outer plate 12 and the entire battery device.

[0056] The connecting rod 16 connects the outer plate 12 and the inner plate 13, forming a stable connection structure inside the battery device 100. This helps to enhance the structural strength of the entire battery device 100. Especially when the battery cell 11 expands and generates a large pressure, the connecting rod 16 can withstand a certain amount of tensile and compressive forces, connecting the inner plate 13 and the outer plate 12 more tightly together, reducing the situation of separation or deformation between the outer plate 12 and the inner plate 13, and improving the overall structural stability and compressive resistance of the battery device 100.

[0057] Moreover, this structural design makes the installation of the inner plate 13 and the outer plate 12 more convenient. During the installation process, by passing the connecting rod 16 through the through hole and abutting it against the inner plate 13, the position of the inner plate 13 can be quickly and accurately located, improving the installation efficiency. When maintaining or replacing components such as the battery cell 11 and the elastic member 15, the connecting rod 16 also facilitates the disassembly and installation of the inner plate 13, reducing the maintenance difficulty and saving maintenance time and cost.

[0058] It should be noted that, to improve the buffering effect, the connecting rod 16 with the elastic member 15 between the inner plate 13 and the outer plate 122 needs to be set at regular intervals; if the connecting rods 16 are set too densely, it will increase the component cost, and if they are set too sparsely, it will lead to a reduction in the buffering effect between the inner plate 13 and the outer plate 122.

[0059] According to an embodiment of the present application, the elastic member 15 is sleeved on the connecting rod 16. When the battery cell 11 expands, the inner plate 13 compresses the elastic member 15 and drives the connecting rod 16 to move towards the outer plate 122.

[0060] In the embodiment of the present application, the elastic member 15 is sleeved on the connecting rod 16, so that when the battery cell 11 expands, the elastic member 15 can accurately play a buffering role between the inner plate 13 and the outer side plate 122, effectively absorbing and dispersing the pressure generated by the expansion of the battery cell 11.

[0061] The connecting rod 16 provides a guiding direction for the compression and extension of the elastic member 15. When the inner plate 13 moves under the pressure of the expansion of the battery cell 11, the elastic member 15 will be compressed along the axial direction of the connecting rod 16, ensuring that the elastic member 15 can be uniformly stressed and deformed, so as to more effectively exert its buffering performance. At the same time, this guiding effect also helps to ensure that the elastic member 15 will not be distorted or skewed during repeated compression and extension processes, extending its service life.

[0062] The sleeved structure forms a more compact overall structure among the elastic member 15, the connecting rod 16, the inner plate 13 and the outer plate 12. When the battery device 100 is subjected to external impact or vibration, they can work better together to resist external forces jointly, reducing the relative displacement and loosening between components, and improving the structural stability and seismic resistance of the entire battery device.

[0063] During the assembly process of the battery device, sleeving the elastic member 15 on the connecting rod 16 is a relatively simple and easy-to-operate method. This installation method can improve the assembly efficiency, reduce errors and uncertainties during the installation process, enable each component to be accurately installed in the predetermined position, and improve the overall performance and quality of the battery device 100.

[0064] According to an embodiment of the present application, the elastic member 15 includes one or more of a spring, a spring sheet, rubber, and sponge.

[0065] In the embodiment of the present application, one or more of a spring, a spring sheet, rubber, and sponge can be flexibly selected and combined according to factors such as the specific design requirements, space limitations, cost budget, and expected buffering performance of the battery device 100. For example, for a battery device 100 with a compact space, a spring sheet or rubber can be selected to cooperate with the spring to achieve good buffering effects in a limited space; for application scenarios that are more sensitive to costs, the proportion of materials with lower costs such as sponge can be appropriately increased.

[0066] Elastic members made of different materials have their own advantages under different working environments and conditions. Springs have relatively stable performance in high-temperature environments; rubber has good corrosion resistance and sealing properties and is suitable for some harsh working environments; sponge can still maintain a certain degree of elasticity and buffering performance in low-temperature environments. By reasonably selecting and combining these materials, the battery device 100 can have a reliable buffering and protection function under various complex working conditions.

[0067] According to an embodiment of the present application, the connecting rod 16 and the inner plate 13 are integrally designed.

[0068] In the embodiment of the present application, the integral design of the connecting rod 16 and the inner plate 13 eliminates the connection gap or interface between the connecting rod 16 and the inner plate 13, making the two form a continuous integral structure. In this way, when bearing the pressure generated by the expansion of the battery cell 11, the stress can be more evenly dispersed, reducing the risks of rupture, deformation, etc. caused by insufficient strength at the connection part, thereby improving the structural stability and reliability of the entire battery device 100. At the same time, this design can reduce the loss and lag in the energy transfer process, enabling the elastic member to play a buffering role more timely and effectively.

[0069] Compared with the split design, the integral connecting rod 16 and inner plate 13 do not require complex assembly operations to connect the two. During the production process, the integral component can be directly installed into the battery device 100, reducing the number of parts and assembly steps, helping to improve production efficiency, reduce production costs, and the probability of errors during the assembly process. In the split design, there are problems such as poor fit or position deviation between the connecting rod 16 and the inner plate 13 caused by assembly errors. The integral design improves the overall performance and consistency of the battery device 100.

[0070] According to an embodiment of the present application, on the side of the outer plate 122 away from the inner plate 13, a first installation groove 1222 located on the outer circle of the through hole is further provided; the battery device 100 further includes a fastener 17, and the fastener 17 is disposed in the first installation groove 1222 and fixed on the connecting rod 16 to fix the relative positions of the outer plate 122 and the inner plate 13.

[0071] In the embodiment of the present application, the first installation groove 1222 provides a precise installation position for the fastener 17, enabling it to be accurately fixed on the connecting rod 16, thereby precisely defining the relative positions of the outer plate 122 and the inner plate 13. This helps to ensure the stability of the internal structure of the battery device 100, enables the components to maintain the correct relative position relationship during operation, and reduces the probability of affecting the performance of the battery device 100 due to component displacement.

[0072] By installing the fastener 17 in the first installation groove 1222 and fixing it on the connecting rod 16, a reliable connection structure can be formed. This connection method can withstand the pressure and stress generated by the battery cell 11 under various working conditions, reduce the looseness or separation between the outer plate 122 and the inner plate 13, improve the strength and reliability of the overall structure of the battery device 100, and enhance its stability during long-term use.

[0073] The provision of the first mounting groove 1222 makes the installation of the fastener 17 more convenient. The staff can quickly position the fastener 17 at the designated position and fix it. When maintenance or repair of the battery device is required, the fastener can also be easily disassembled to separate the outer plate and the inner plate, so as to inspect, repair or replace the internal components, improving the efficiency of the maintenance work.

[0074] According to an embodiment of the present application, on the side of the outer plate 122 close to the inner plate 13, there is also a second mounting groove 1223 located on the outer circle of the through hole; the battery device 100 further includes a first sealing member (not shown in the figure) and a second sealing member (not shown in the figure). The first sealing member is disposed in the first mounting groove 1222 on the side of the fastener 17 close to the inner plate 13, and the second sealing member is disposed in the second mounting groove 1223 on the side of the elastic member 15 close to the outer plate 122.

[0075] In the embodiment of the present application, the first sealing member is in the first mounting groove 1222 on the side of the fastener 17 close to the inner plate 13, which can effectively reduce the entry of external pollutants such as dust and water vapor into the interior of the battery device 100 through the connection between the fastener 17 and the outer plate 122. The second sealing member is disposed in the second mounting groove 1223 on the side of the elastic member 15 close to the outer plate 122, which can effectively reduce the entry of external substances from the gap between the elastic member 15 and the outer plate 122. This helps to improve the cleanliness inside the battery device 100, reduce problems such as a decline in battery performance and short circuit caused by the intrusion of external impurities, and extend the service life of the battery.

[0076] Moreover, the first sealing member and the second sealing member can effectively reduce the entry of external humid air or corrosive gas into the interior of the battery device 100, reducing the possibility of corrosion of the internal components. The second sealing member also plays a protective role for the elastic member, reducing the situation of its aging and damage due to contact with external substances, thereby improving the buffering performance and service life of the elastic member, and further better reducing the impact of the expansion pressure of the battery cell 11 on the battery device 100.

[0077] The provision of the sealing member can also reduce the leakage of the electrolyte into the external environment. On the one hand, it reduces the corrosion and pollution of the surrounding environment by the electrolyte, and on the other hand, it also improves the stability of the amount of chemical substances inside the battery, thus maintaining the normal performance of the battery device 100.

[0078] The provision of the two sealing members makes the battery device 100 have better waterproof performance. Even when used in a humid or watery environment, it can effectively reduce the entry of water into the interior and cause damage. This expands the scope of use and application scenarios of the battery device 100, enabling it to adapt to more different working environments.

[0079] The first seal plays a certain role in fixing and buffering the fastener 17 in the first installation groove 1222, reducing the possibility of vibration and loosening of the fastener 17 during the operation of the battery device 100, thereby enhancing the stability of the connection between the outer plate 122 and the inner plate 13. The second seal also plays a role in positioning and stabilizing the elastic member 15 in the second installation groove 1223, keeping the elastic member 15 in the correct position during the compression and rebound processes, and improving the stability and reliability of the entire structure.

[0080] According to an embodiment of the present application, the thickness of the inner plate 13 is less than or equal to the thickness of the outer plate 122.

[0081] In the embodiment of the present application, the thickness of the inner plate 13 is less than the thickness of the outer plate 122.

[0082] As an external protection structure of the battery device 100, it needs to withstand external impact force and pressure. A thicker design can provide better strength and rigidity to protect the internal battery cells 11 and other components. The inner plate 13 is mainly in direct contact with the battery cells 11. On the premise of meeting functions such as support and pressure conduction, appropriately reducing the thickness can, while improving the overall structural strength, reduce the weight of the battery device 100 and achieve the optimization of the structural design.

[0083] In the case where the internal space of the battery device 100 is limited, the relatively thin inner plate 13 can create more space for the battery cells 11 or other components, which is beneficial to improving the energy density of the battery device 100. For example, more battery cells 11 can be accommodated under the same outer shell size, or more sufficient installation space can be provided for other necessary components such as the battery management system, thereby enhancing the performance and practicality of the entire battery device 100.

[0084] The battery generates heat during the charging and discharging processes and needs to dissipate the heat in time to improve the performance and lifespan of the battery. The thinner inner plate 13 is beneficial for the heat to transfer from the battery cells 11 to the outer plate 122 and then be dissipated to the external environment through the outer plate 122. Because the thinner inner plate 13 has a relatively small thermal resistance and can conduct heat more effectively, it helps to improve the heat dissipation efficiency of the battery device 100 and reduce problems such as performance degradation and safety hazards caused by overheating of the battery.

[0085] The reduction of the thickness of the inner plate 13 can reduce the material cost. At the same time, since the inner plate 13 usually needs to be in close contact with the battery cells 11 and may require some special materials, reducing the thickness can further reduce the cost on the premise of maintaining the performance.

[0086] In the embodiment of the present application, the thickness of the inner plate 13 is equal to the thickness of the outer plate 122.

[0087] The rigidity of the battery device 100 can be further improved. The inner plate 13 and the outer plate 122 with the same thickness build a more stable support system inside the battery device 100. The equal-thickness design enables the inner and outer plates to bear the pressure from the battery cell 11 together, such as the expansion force during the charge and discharge process of the battery, or the acting force generated when the device is subjected to external vibration and impact. At this time, the entire structure can disperse the pressure more evenly, reduce the deformation caused by uneven stress in local areas, greatly enhance the overall rigidity of the battery device 100, and enable it to maintain a stable structural form under complex working conditions.

[0088] According to an embodiment of the present application, the material of the inner plate 13 is the same as that of the outer plate 12.

[0089] In the embodiment of the present application, the same material of the inner plate 13 and the outer plate 12 enables the inner plate 13 and the outer plate 12 to have the same physical and mechanical properties, such as strength, stiffness, toughness, etc. This enables the inner plate 13 and the outer plate 12 to maintain a consistent mechanical response when bearing forces, work together, and jointly bear various stresses received by the battery device 100, thereby improving the structural strength and stability of the entire battery device 100 and effectively protecting the internal battery cell 11 and other components.

[0090] The same material results in the same thermal properties such as thermal conductivity, which is beneficial to the uniform conduction and dissipation of heat inside the battery device 100. The heat generated by the battery cell 11 during the charge and discharge process can be conducted to the external environment in a more consistent manner through the inner plate 13 and the outer plate 12, reducing the situation where heat accumulates in a certain part due to the difference in the thermal properties of the inner and outer plates. Thereby, the heat dissipation efficiency of the battery device 100 is improved, the battery is maintained within a suitable working temperature range, which helps to extend the service life of the battery and improve its performance.

[0091] When the inner plate 13 and the outer plate 12 adopt the same corrosion-resistant material, they have the same corrosion resistance when facing corrosive substances such as water vapor, acids, and alkalis in the external environment, can resist the corrosion effect simultaneously, protect the internal structure and components of the battery device 100 from corrosion, improve the weather resistance and reliability of the battery device 100, and extend its overall service life.

[0092] According to an embodiment of the present application, the battery cell 11 includes a housing 111, an electrode assembly 112 located inside the housing 111, and a cover plate 113 covering the open end of the housing 111. The housing 111 is filled with an electrolyte; the electrode assembly 112 includes a negative electrode plate and a positive electrode plate, and a separator disposed between the negative electrode plate and the positive electrode plate.

[0093] In the embodiments of the present application, the battery cell 11 can be a secondary battery, which refers to a battery cell 11 that can be activated by charging after discharging so as to be used continuously. The battery cell 11 can include, but is not limited to, 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.

[0094] The battery cell 11 includes a housing 111, an electrode assembly 112, and a cover plate 113. The housing 111 has a communicating cavity and an installation opening (open end). The number of the electrode assemblies 112 can be one or more; the electrode assemblies 112 are installed in the cavity of the housing 111. The cover plate 113 is connected to the housing 111 and covers the open end. The housing 111 is filled with an electrolyte, such as an electrolyte solution. The housing 111 is a hollow structure, and the material of the housing 111 can be metal or plastic; for example, the material of the housing 111 can be copper, iron, aluminum, steel, aluminum alloy, etc.

[0095] The electrode assembly 112 includes a negative electrode plate and a positive electrode plate, and a separator disposed between the negative electrode plate and the positive electrode plate. During the charge and discharge process of the battery cell 11, active ions (such as lithium ions) are embedded and extracted back and forth between the negative electrode plate and the positive electrode plate. The separator can, to a certain extent, prevent the negative electrode plate from short-circuiting with the positive electrode plate, and at the same time allow the active ions to pass through.

[0096] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that: include: Battery cells; An outer plate, the outer plate comprising a bottom plate and outer plates oppositely disposed at two ends of the bottom plate, the outer plates oppositely disposed at the two ends and the bottom plate surround a receiving cavity; the battery cells are sequentially arranged in the receiving cavity; An inner plate, the inner plate being disposed between the outer plate and the battery cell; a buffer cavity being formed between the inner plate and the outer plate; An elastic member, disposed in the buffer cavity, connecting the outer plate and the inner plate, so that when the battery cell expands, the inner plate compresses the elastic member to move toward the outer plate; A connecting rod, wherein the outer plate includes a through hole, one end of the connecting rod is passed through the through hole, and the other end of the connecting rod abuts against the inner plate; The connecting rod can move in the through hole to enable the inner plate to compress the elastic member and move toward the outer plate.

2. The battery device according to claim 1, characterized in that: The elastic member is sleeved on the connecting rod, and when the battery cell expands, the inner plate compresses the elastic member to drive the connecting rod to move toward the outer plate.

3. The battery device according to claim 1 or 2, characterized in that: The elastic member includes one or more of a spring, a spring sheet, rubber, and a sponge.

4. The battery device according to claim 1, characterized in that: The connecting rod and the inner plate are designed as one piece.

5. The battery device according to claim 1, characterized in that: The side of the outer plate away from the inner plate is also provided with a first mounting groove located at the outer circle of the through hole; The battery device further includes a fastener, which is disposed in the first mounting groove and fixed on the connecting rod to fix the relative position of the outer plate and the inner plate.

6. The battery device according to claim 5, characterized in that: A second mounting groove is also provided on the side of the outer plate close to the inner plate and located at the outer circle of the through hole; The battery device further comprises a first seal and a second seal. The first seal is arranged in the first mounting groove of the fastener close to the inner plate, and the second seal is arranged in the second mounting groove of the elastic member close to the outer plate.

7. The battery device according to claim 1, characterized in that: The thickness of the inner plate is less than or equal to the thickness of the outer plate.

8. The battery device according to claim 1, characterized in that: The material of the inner panel is the same as that of the outer panel.

9. The battery device according to claim 1, characterized in that: The battery cell includes a shell, an electrode assembly located in the shell, and a cover plate covering the open end of the shell, and the shell is filled with electrolyte; the electrode assembly includes a negative electrode sheet and a positive electrode sheet, and a separator arranged between the negative electrode sheet and the positive electrode sheet.

10. An electrical device, characterized in that: The electrical device comprises the battery device according to any one of claims 1 to 9, and the battery device is used to provide electrical energy.

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