Battery cell module, battery module and battery pack

Abstract

The utility model provides a battery cell module, a battery module and a battery pack. The battery cell module comprises two battery cell monomers (1), and the two battery cell monomers (1) are arranged at an interval along the expansion direction of the battery cell monomers (1); the elastic device (2) is arranged between the two battery cell monomers (1), the elastic device (2) comprises a first side plate (3) and a second side plate (4) which are oppositely arranged along the expansion direction of the battery cell monomers (1), and a plurality of springs (5) arranged between the first side plate (3) and the second side plate (4), one of the two battery cell monomers (1) is positioned on one side, far away from the second side plate (4), of the first side plate (3), and the other of the two battery cell monomers (1) is positioned on the other side, far away from the second side plate (4), of the second side plate (4). And the other one of the two battery cell monomers (1) is positioned on one side, far away from the first side plate (3), of the second side plate (4). The battery cell module disclosed by the utility model can effectively solve the problems that the traditional foam shows obvious stress loss and the rebound resilience is reduced in an all-solid-state battery.

Description

Cell modules, battery modules and battery packs Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a cell module, a battery module, and a battery pack. Background Technology

[0002] With the continuous advancement of energy technology, all-solid-state batteries have gradually become a research hotspot in the battery field due to their advantages such as high energy density, safety, and long lifespan. Compared to traditional liquid lithium-ion batteries, all-solid-state batteries use solid electrolytes instead of flammable liquid electrolytes, greatly improving the overall safety and reliability of the battery.

[0003] During the assembly of pouch cells, the cells have the following technical characteristics:

[0004] 1. A certain force needs to be applied to the large surface of the cell in the normal direction of the electrode to obtain the best working performance and lifespan;

[0005] 2. The battery cell has the characteristic of breathing expansion during charge-discharge cycles and throughout its entire lifespan.

[0006] To ensure both sufficient space for cell expansion and adequate pressure on the cell surface, a common practice is to place cushioning foam between the cells. Within a certain compression range (e.g., 20%-80% or less), this cushioning foam can provide both space for cell expansion and a degree of restraint on the cell surface. This requires the foam to possess several key characteristics:

[0007] 1. Foam needs to have a relatively flat pressure-deformation curve within its operating compression range (e.g., 20%-80% or less);

[0008] 2. The pressure range provided by the foam must meet the usage requirements of the battery cell;

[0009] 3. Throughout the product's lifespan, the foam needs to have minimal compression and rebound loss, and be able to provide the pressure and deformation required by the battery cell even at the end of its lifespan.

[0010] In current all-solid-state battery packaging solutions, mainstream manufacturers primarily use pouch cells. However, all-solid-state pouch cells still exhibit breathing expansion characteristics and require pressure to be applied to their surface. Furthermore, due to their interface characteristics, the pressure (1-15MPa) required to be applied to the surface of all-solid-state batteries is significantly greater than that of traditional liquid lithium-ion batteries (30-300kPa).

[0011] In the assembly and packaging of pouch cells, to ensure optimal cell performance and extend lifespan, a certain pressure needs to be applied to the large surface area of ​​the cell's electrodes to maintain close contact between the electrodes and the electrolyte, reduce internal resistance, and improve energy efficiency. Simultaneously, the cell undergoes volume changes during charging and discharging due to the insertion and extraction of lithium ions, a phenomenon known as "breathing expansion." This requires the packaging material to provide sufficient deformation space to prevent structural damage to the cell caused by pressure and expansion.

[0012] To address these issues, current encapsulation solutions often employ cushioning foam as a material for isolation and pressure regulation between battery cells. Cushioning foam absorbs cell expansion through its elastic deformation properties and applies pressure to the cells at a certain compression ratio. However, for all-solid-state batteries, the required pressure range far exceeds the capabilities of traditional foams. For example, all-solid-state batteries require pressures of 1-15 MPa applied to the large surface area of ​​the cell. Traditional foam materials, such as PU, silicone, or plastic sheets, not only lose elasticity under high pressure but also experience a significant decrease in resilience over time, especially after the compression ratio exceeds 60%, where the pressure decay over time is particularly pronounced. Therefore, traditional foams often exhibit significant stress loss and decreased resilience under this pressure, failing to meet the requirements for long-term stable pressure application. Summary of the Invention

[0013] The main purpose of this invention is to provide a cell module, battery module, and battery pack that can effectively solve the problem that traditional foam often exhibits significant stress loss and decreased resilience under this pressure, failing to meet the requirements of long-term stable pressure.

[0014] To achieve the above objectives, according to one aspect of the present invention, a battery cell module is provided, comprising:

[0015] The battery cell is a single cell, and there are two battery cells, which are spaced apart along the expansion direction of the battery cell.

[0016] An elastic device is disposed between two battery cells. The elastic device includes a first side plate and a second side plate disposed opposite to each other along the expansion direction of the battery cells, and a plurality of springs disposed between the first side plate and the second side plate. One of the two battery cells is located on the side of the first side plate away from the second side plate, and the other of the two battery cells is located on the side of the second side plate away from the first side plate.

[0017] This cell module structure cleverly utilizes the dynamic pressure compensation characteristics of multiple springs within an elastic device. Combined with the first and second side plates positioned along the expansion direction of the individual cell, it forms an effective isolation and pressure regulation mechanism. This allows the two individual cells to maintain a stable distance and uniform stress state during the expansion and contraction "breathing" cycle, even under the high-pressure and tight conditions unique to all-solid-state batteries, thanks to the precise adjustment of the elastic device. This significantly improves the thermal stability and mechanical reliability of the cell module, providing a high-performance packaging and protection solution for all-solid-state pouch batteries. The elastic device, comprising multiple springs, along with the structural support of the first and second side plates, constructs a dynamic pressure balance mechanism. Utilizing the structural characteristics of springs—namely, their stable elastic coefficient and excellent resilience—it effectively solves the problems of stress loss and reduced resilience faced by traditional foam materials under high-pressure and tight conditions. This ensures that the individual cell maintains a stable and consistent constraint force even under thousands of charge-discharge cycles and pressures as high as 1–20 MPa, thus maintaining optimal cell performance and lifespan in all-solid-state battery applications.

[0018] Furthermore, the elastic device includes a sealing housing, which comprises a first side plate and a second side plate. The sealing housing has a sealing cavity, and is provided with an inlet and an outlet, both of which communicate with the sealing cavity. The spring is located inside the sealing cavity. This allows for precise control of the dynamic pressure between individual battery cells, ensuring rebound stability and low stress loss under high-voltage conditions.

[0019] Furthermore, the sealed housing includes a main shell and end plates. The main shell includes an inner cavity and openings located at both ends of the main shell and communicating with the inner cavity. The end plates are disposed at both ends of the main shell and have communicating cavities. The sealed cavity includes the inner cavity and the communicating cavity, with the openings communicating with the communicating cavities. Both the liquid inlet and the liquid outlet communicate with the communicating cavities. The liquid inlet is disposed on the end plate at the first end of the main shell, and the liquid outlet is disposed on the end plate at the second end of the main shell. This achieves the dual benefits of precise pressure control and efficient thermal management of the individual battery cells, ensuring the stable performance and extended lifespan of the all-solid-state battery module under high-voltage and high-energy-density operating conditions.

[0020] Furthermore, the sealing housing includes a main shell and end plates. The main shell includes an inner cavity and openings located at both ends of the main shell and communicating with the inner cavity. The end plates are disposed at both ends of the main shell, and the liquid inlet and outlet are disposed on the end plates, both communicating with the inner cavity. This achieves direct communication between the inner cavity and the coolant, allowing the spring to move freely within the inner cavity as the battery cell expands and contracts, while the coolant can effectively circulate in and out.

[0021] Furthermore, the end of the main shell is embedded within the end plate and forms a sealing fit with it. This ensures the tightness of the entire sealed shell structure and the leak-free circulation of the liquid medium.

[0022] Furthermore, an elastic washer is provided between the main housing and the end plate. The outer wall of the main housing is bonded and fixed to the inner wall of the elastic washer, and the outer wall of the elastic washer is bonded and fixed to the inner wall of the groove of the end plate; or, the main housing includes a first side plate and a second side plate disposed opposite to each other, and the first side plate and the second side plate are fixedly connected by a flexible connecting plate. This effectively enhances the overall sealing performance of the sealed housing and ensures leak-free circulation of coolant under high pressure.

[0023] Furthermore, the end plate is an insulating plate, on which a busbar is fixedly installed; and / or, the main casing is a square metal casing. This effectively isolates electrical interference between individual battery cells, ensuring the internal electrical safety of the battery module.

[0024] Furthermore, the liquid inlet and outlet are located at the top of the end plate, and both the inlet and outlet are equipped with water pipe connectors. This makes the connection of the cooling system simpler and more convenient.

[0025] Furthermore, the spring is a disc spring, with its first end abutting against the first side plate and its second end abutting against the second side plate. This allows for precise control of the pressure applied to the cell surface, ensuring that the all-solid-state battery maintains optimal performance under different charge and discharge conditions. Simultaneously, the disc spring's rebound force and rebound space effectively meet the large-area clamping force and expansion space requirements of the all-solid-state cell, with minimal rebound loss and high reliability.

[0026] Furthermore, multiple springs are evenly arranged along the length and width of the first side plate. This ensures that each battery cell is subjected to uniform pressure in the normal direction of its large surface area.

[0027] Furthermore, both the first and second side plates have grooves on the side facing the spring. The first end of the spring is embedded in the groove of the first side plate, and the second end of the spring is embedded in the groove of the second side plate. This ensures the positional stability of the disc spring under force and provides an accurate pressure transmission path during compression and rebound caused by changes in the thickness of the battery cell, preventing spring misalignment or wear.

[0028] According to another aspect of this utility model, a battery module is provided, including a cell module, an outer side plate, and binding straps. The cell module is the aforementioned cell module, and multiple cell modules are stacked. Along the stacking direction of the cell modules, the outer side plate is disposed on both sides of the stacked cell modules, and the binding straps are attached to the outer side plate and the cell modules. This ensures that the entire module maintains structural stability and uniform pressure between the cells during dynamic changes in the thickness of the individual cell.

[0029] According to another aspect of the present invention, a battery pack is provided, including the above-described cell module or the above-described battery module. Attached Figure Description

[0030] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0031] Figure 1 is a three-dimensional structural schematic diagram of the battery cell module according to an embodiment of the present invention;

[0032] Figure 2 is a front view structural schematic diagram of the battery cell module according to an embodiment of the present utility model;

[0033] Figure 3 is a side view of the battery cell module according to an embodiment of the present invention;

[0034] Figure 4 is a three-dimensional exploded view of the battery cell module according to an embodiment of the present invention;

[0035] Figure 5 is an exploded structural diagram of the battery cell module according to an embodiment of the present invention;

[0036] Figure 6 is an isometric view of the sealed housing of the battery cell module according to an embodiment of the present invention after removing one end plate;

[0037] Figure 7 is a side view of the sealed housing of the battery cell module according to an embodiment of the present invention after removing one end plate;

[0038] Figure 8 is a structural diagram of the fit between the main shell and the end plate of the battery cell module according to another embodiment of the present invention; and

[0039] Figure 9 is a three-dimensional structural diagram of the battery module according to an embodiment of the present invention.

[0040] The above figures include the following reference numerals:

[0041] 1. Battery cell; 2. Elastic device; 3. First side plate; 4. Second side plate; 5. Spring; 6. Sealed housing; 7. Liquid inlet; 8. Liquid outlet; 9. Main housing; 10. End plate; 11. Inner cavity; 12. Opening; 13. Manifold; 14. Water pipe connector; 15. Outer side plate; 16. Binding strap; 17. Elastic washer; 18. Flexible connecting plate. Detailed Implementation

[0042] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0043] Referring to Figures 1 to 9, according to an embodiment of the present invention, a battery cell module is provided, comprising: a battery cell 1, wherein there are two battery cell 1s, which are spaced apart along the expansion direction of the battery cell 1; an elastic device 2 disposed between the two battery cell 1s, the elastic device 2 comprising a first side plate 3 and a second side plate 4 disposed opposite to each other along the expansion direction of the battery cell 1s, and a plurality of springs 5 ​​disposed between the first side plate 3 and the second side plate 4, wherein one of the two battery cell 1s is located on the side of the first side plate 3 away from the second side plate 4, and the other of the two battery cell 1s is located on the side of the second side plate 4 away from the first side plate 3.

[0044] The cell module structure ingeniously utilizes the dynamic pressure compensation characteristics of multiple springs 5 ​​within the elastic device 2, and together with the first side plate 3 and the second side plate 4 arranged along the expansion direction of the cell 1, it forms an effective isolation and pressure regulation mechanism. This allows the two cell 1s to maintain a stable distance and uniform force state during the expansion and contraction "breathing" cycle, even under the high pressure and tightness environment unique to all-solid-state batteries, through the fine adjustment of the elastic device 2. This significantly improves the thermal stability and mechanical reliability of the cell module, providing a high-performance packaging and protection solution for all-solid-state soft-pack batteries.

[0045] The elastic device 2 includes multiple springs 5, which, together with the structural support of the first side plate 3 and the second side plate 4, construct a dynamic pressure balance mechanism. Utilizing the structural characteristics of the springs, namely their stable elastic coefficient and good resilience, it effectively solves the problems of stress loss and reduced resilience faced by traditional foam materials under high pressure and tightness. This ensures that the battery cell 1 can still enjoy stable and consistent constraint force even under thousands of charge-discharge cycles and pressures as high as 1 to 20 MPa, thereby maintaining the optimal state of cell performance and lifespan in all-solid-state battery applications.

[0046] In one embodiment, the elastic device 2 includes a sealing housing 6, which includes a first side plate 3 and a second side plate 4. The sealing housing 6 has a sealing cavity, and the sealing housing 6 is provided with an inlet 7 and an outlet 8, both of which are in communication with the sealing cavity. The spring 5 is located inside the sealing cavity.

[0047] By placing the spring 5 inside the sealed cavity of the sealed housing 6 formed by the first side plate 3 and the second side plate 4, and realizing the circulation of the liquid medium through the liquid inlet 7 and the liquid outlet 8, the elastic device 2 can not only accurately regulate the dynamic pressure between the individual cells 1, ensuring rebound stability and low stress loss under high pressure conditions, but also efficiently manage the heat of the cells, realizing multiple functions of cooling, heating and heat insulation, which greatly optimizes the thermodynamic performance and mechanical stability of the all-solid-state battery module.

[0048] In one embodiment, the sealing housing 6 includes a main housing 9 and an end plate 10. The main housing 9 includes an inner cavity 11 and openings 12 located at both ends of the main housing 9 and communicating with the inner cavity 11. The end plate 10 is disposed at both ends of the main housing 9 and has a communicating cavity. The sealing cavity includes the inner cavity 11 and the communicating cavity. The openings 12 communicate with the communicating cavity. The liquid inlet 7 and the liquid outlet 8 are both communicating with the communicating cavity. The liquid inlet 7 is disposed on the end plate 10 at the first end of the main housing 9, and the liquid outlet 8 is disposed on the end plate 10 at the second end of the main housing 9.

[0049] The sealed housing 6 forms a sealed cavity together with the openings 12 at both ends of the main housing 9 and the connecting cavity of the end plate 10. The spring 5 moves in the inner cavity 11 with the expansion and compression of the battery cell 1. The liquid cooling medium enters through the liquid inlet 7 at the first end and flows out through the liquid outlet 8 at the second end, effectively circulating in the connecting cavity. This achieves the dual functions of precise pressure control and efficient thermal management of the battery cell 1, ensuring the stable performance and extended life of the all-solid-state battery module under high pressure and high energy density operating conditions.

[0050] In one embodiment, the sealing housing 6 includes a main housing 9 and end plates 10. The main housing 9 includes an inner cavity 11 and openings 12 located at both ends of the main housing 9 and communicating with the inner cavity 11. The end plates 10 are disposed at both ends of the main housing 9, and inlet ports 7 and outlet ports 8 are disposed on the end plates 10 and both communicate with the inner cavity 11. The main housing 9 includes a first side plate 3 and a second side plate 4 disposed opposite to each other, and a connecting plate connecting the first side plate 3 and the second side plate 4. The first side plate 3, the second side plate 4, and the two connecting plates together form the main housing 9 with openings at both ends.

[0051] This design achieves direct communication between the inner cavity 11 and the coolant by setting end plates 10 at both ends of the main shell 9 and configuring inlet 7 and outlet 8 on the end plates 10. This allows the spring 5 to move freely in the inner cavity 11 with the expansion and contraction of the cell 1, while the coolant can circulate effectively in and out. This not only ensures that the cell is subjected to precise dynamic pressure regulation under high pressure conditions, but also provides efficient thermal management, thereby significantly improving the performance stability and service life of the all-solid-state battery module.

[0052] In this embodiment, the end plate 10 does not need to be provided with a connecting cavity. The liquid inlet 7 and the liquid outlet 8 do not need to be connected to the inner cavity 11 through the connecting cavity. Instead, they are directly connected to the inner cavity from the top or bottom side wall of the main shell 9, or they can extend directly along the side of the end plate away from the main shell 9 and connect to the inner cavity 11 through the opening 12. The end plate 10 is only used to seal with the main shell 9.

[0053] In one embodiment, the end of the main housing 9 is embedded in the end plate 10 and is sealed to the end plate 10.

[0054] The sealed and embedded design of the end of the main shell 9 and the end plate 10 ensures the tightness of the entire sealed shell 6 structure and the leak-free circulation of the liquid medium. This ensures that the dynamic displacement of the spring 5 in the inner cavity 11 will not affect the normal operation of the cooling system, effectively maintains the thermal balance of the cell module, and at the same time ensures stable pressure transmission under high pressure and stress conditions, thereby enhancing the reliability of the all-solid-state battery under complex working conditions.

[0055] In this embodiment, the end of the main shell 9 is embedded in the groove of the end plate 10, forming a tight fit with the end plate 10. The two have a strong bonding force. When the cell 1 expands or contracts, due to the adhesion between the cell 1 and the first side plate 3 of the main shell 9, and the approximately 30mm gap between the edge of the adhesion and the end position of the end plate 10, the expansion and compression of the cell 1 will act on the middle area of ​​the first side plate 3 and the second side plate 4 of the main shell 9. The compression effect on the joint position of the main shell 9 and the end plate 10 is small. The deformation of the main shell 9 under the expansion of the cell 1 has little impact on the joint position of the main shell 9 and the end plate 10. Therefore, it will not affect the sealing performance of the joint position of the main shell 9 and the end plate 10, thereby ensuring the sealing performance of the main shell 9 and the end plate 10 during the expansion and contraction of the cell 1, effectively preventing the leakage of coolant, improving the reliability of the cooling structure, and ensuring the working performance of the all-solid-state battery.

[0056] In one embodiment, an elastic washer 17 is provided between the main shell 9 and the end plate 10. The outer wall of the main shell 9 is bonded and fixed to the inner wall of the elastic washer 17, and the outer wall of the elastic washer 17 is bonded and fixed to the inner wall of the groove of the end plate 10.

[0057] By adding an elastic washer 17 between the main shell 9 and the end plate 10 and fixing it by bonding the inner and outer walls, the overall sealing performance of the sealed shell 6 is effectively enhanced, ensuring the leak-free circulation of coolant under high pressure. At the same time, the presence of the elastic washer 17 absorbs the vibration and displacement generated when the spring 5 moves, further improving the stability and safety of the cell module during dynamic pressure regulation, and ensuring the excellent thermal management and mechanical performance of the all-solid-state battery.

[0058] When the battery cell 1 expands or contracts, the resulting deformation directly acts on the elastic washer 17. The elastic washer 17 deforms to adapt to the expansion or contraction of the battery cell 1, ensuring a good seal between the elastic washer 17 and the main housing 9. This prevents coolant leakage at the mating point. Simultaneously, the elasticity of the elastic washer 17 ensures a good seal between its outer wall and the inner wall of the groove in the end plate 10, preventing coolant leakage from this point. This design effectively utilizes the deformation of the elastic washer 17 to absorb any gaps that may arise between the main housing 9 and the end plate 10 due to the expansion or contraction of the battery cell 1. This ensures that the overall compression or expansion of the main housing 9 does not affect the sealing effect between the main housing 9 and the end plate 10, guaranteeing the reliability and stability of the cooling structure.

[0059] In one embodiment, the main shell 9 includes a first side plate 3 and a second side plate 4 disposed opposite to each other, and the first side plate 3 and the second side plate 4 are fixedly connected by a flexible connecting plate 18.

[0060] In this embodiment, the main shell 9 is connected to the second side plate 4 by a flexible connecting plate 18 through the first side plate 3, which allows the main shell 9 to adapt to small deformations under the dynamic pressure changes of the spring 5, maintain structural integrity, and at the same time ensure that the sealing performance of the sealed shell 6 is not damaged, effectively improving the adaptability of the all-solid-state battery module under high pressure and tightness conditions and the stability of long-term operation.

[0061] Since the first side plate 3 and the second side plate 4 need to support the spring 5, they need to have high rigidity to transmit the elastic effect of the spring 5. However, the flexible connecting plate 18 located between the first side plate 3 and the second side plate 4 does not need to have high rigidity. Therefore, it can be made of flexible material. The flexibility of the flexible connecting plate 18 can be used to absorb and digest the volume change generated during the expansion or contraction of the battery cell 1, better adapt to the expansion or contraction of the battery cell 1, and will not cause a large structural impact on the main shell 9, thus effectively improving the service life of the main shell 9.

[0062] In one embodiment, the end plate 10 is an insulating plate, on which a busbar 13 is fixedly mounted. The fixed mounting of the busbar 13 on the end plate 10, which is made of insulating plate material, not only effectively isolates the electrical interference between individual battery cells 1 and ensures the electrical safety inside the battery module, but also maintains a stable electrical connection during the movement of the spring 5, realizing reliable series or parallel connection of battery cells in expansion and contraction states, which greatly optimizes the electrical performance and thermal management of the all-solid-state battery module.

[0063] In one embodiment, the main shell 9 is a square metal shell.

[0064] The square metal main shell 9, due to its high strength and thermal conductivity, can efficiently transfer and dissipate the heat generated by the battery cell 1 during operation while withstanding the dynamic pressure of the spring 5. Combined with its sealed structure, it ensures a stable pressure environment and excellent thermal management inside the battery module, significantly improving the working efficiency and durability of the all-solid-state battery under high pressure and stress conditions.

[0065] In one embodiment, the main shell 9 is a square aluminum shell.

[0066] The main shell 9 can also be made of other materials that have thermal conductivity and are deformable, such as metal matrix composites.

[0067] In one embodiment, the inlet 7 and the outlet 8 are located on the top of the end plate 10, and both the inlet 7 and the outlet 8 are provided with water pipe connectors 14.

[0068] The inlet 7 and outlet 8 are located on the top of the end plate 10 and equipped with a water pipe connector 14. This layout not only simplifies the coolant circulation path but also ensures stable operation of the cooling system during the thickness changes of the individual battery cells 1 caused by charge-discharge cycles. It effectively removes the heat generated during battery cell operation and avoids the influence of high-pressure clamping on liquid flow. The water pipe connector 14 also makes the connection of the cooling system simpler and more convenient.

[0069] In one embodiment, the spring 5 is a disc spring, with the first end of the disc spring abutting against the first side plate 3 and the second end of the disc spring abutting against the second side plate 4.

[0070] The first end of the disc spring is in close contact with the first side plate 3, and the second end is firmly connected to the second side plate 4. This allows the disc spring to precisely control the pressure applied to the surface of the cell during the compression and release caused by the change in the thickness of the cell 1, ensuring that the all-solid-state battery always maintains optimal performance under different charging and discharging states. At the same time, the rebound force and rebound space of the disc spring can well meet the requirements of the large-area clamping force and breathing expansion space required by the all-solid-state cell, and the rebound loss is very small, with high reliability, which enhances the overall stability and service life of the battery system.

[0071] The application of disc springs has made the cold plate function, which is not available in the existing technology of using cushioning foam, a reality. It has enabled the original cushioning function to also have functions such as cooling, heating and heat insulation, effectively reducing space consumption.

[0072] In one embodiment, a plurality of springs 5 ​​are evenly arranged along the length and width directions of the first side plate 3.

[0073] Multiple disc springs are evenly distributed along the length and width of the first side plate 3, ensuring that the individual cell 1 is subjected to uniform pressure in the normal direction of the large surface. Even during the periodic changes in thickness caused by the charging and discharging cycle of the all-solid-state battery, it can effectively maintain stable contact and pressure distribution between cells, prevent local stress concentration, and thus significantly improve the overall performance and cycle life of the battery module.

[0074] In this embodiment, the disc springs have m rows and n columns and are arranged in an array, thereby providing sufficient elasticity and deformation space for the battery cell 1.

[0075] In one embodiment, both the first side plate 3 and the second side plate 4 are provided with grooves on the side facing the spring 5, the first end of the spring 5 is embedded in the groove of the first side plate 3, and the second end of the spring 5 is embedded in the groove of the second side plate 4.

[0076] The first side plate 3 and the second side plate 4 have matching grooves on their surfaces facing the spring 5, so that the first end of the disc spring is precisely embedded in the groove of the first side plate 3 and the second end is embedded in the groove of the second side plate 4. This embedded design not only ensures the positional stability of the disc spring when it is under force, but also provides an accurate pressure transmission path during the compression and rebound process caused by the change in the thickness of the battery cell 1, avoiding spring offset or wear, thereby ensuring the uniformity of pressure between the cells and the efficient operation of the cooling system during long-term use, and greatly enhancing the reliability and thermal management performance of the all-solid-state battery module.

[0077] According to an embodiment of the present invention, the battery module includes a cell module, an outer plate 15, and a strap 16. The cell module is the aforementioned cell module, and there are multiple cell modules stacked together. Along the stacking direction of the cell modules, the outer plate 15 is disposed on both sides of the stacked cell modules, and the strap 16 is tied to the outer plate 15 and the cell module.

[0078] In the battery module structure, by stacking multiple cell modules containing disc springs and setting outer plates 15 on both sides of the stacking direction, and using straps 16 for external binding, it is possible to ensure that the entire module maintains structural stability and uniform pressure between cells during the dynamic change of the thickness of the individual cell 1. The combination of outer plates 15 and straps 16 effectively prevents the module from deforming or displacing under high pressure and tension. At the same time, the pressure of the straps further enhances the pre-tensioning effect of the disc springs, ensuring that the all-solid-state battery module can still maintain excellent electrical performance and thermal management level under complex working conditions.

[0079] By adopting the above-mentioned cell module, the elastic device 2 can support the weight of each cell 1, realize the electrical connection between two adjacent cell modules, and enable the electrical connection of the battery module to be adapted to automated production.

[0080] According to an embodiment of the present invention, the battery pack includes the above-described cell module or the above-described battery module.

[0081] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0082] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0083] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery cell module, characterized in that, include: A single battery cell (1), wherein there are two single battery cells (1), and the two single battery cells (1) are spaced apart along the expansion direction of the single battery cells (1); an elastic device (2) is disposed between the two single battery cells (1), the elastic device (2) includes a first side plate (3) and a second side plate (4) disposed opposite to each other along the expansion direction of the single battery cells (1), and a plurality of springs (5) disposed between the first side plate (3) and the second side plate (4), one of the two single battery cells (1) is located on the side of the first side plate (3) away from the second side plate (4), and the other of the two single battery cells (1) is located on the side of the second side plate (4) away from the first side plate (3).

2. The battery cell module according to claim 1, characterized in that, The elastic device (2) includes a sealing housing (6), which includes a first side plate (3) and a second side plate (4). The sealing housing (6) has a sealing cavity. The sealing housing (6) is provided with an inlet (7) and an outlet (8). The inlet (7) and the outlet (8) are both connected to the sealing cavity. The spring (5) is located inside the sealing cavity.

3. The cell module according to claim 2, characterized in that, The sealing housing (6) includes a main housing (9) and an end plate (10). The main housing (9) includes an inner cavity (11) and openings (12) located at both ends of the main housing (9) and communicating with the inner cavity (11). The end plate (10) is disposed at both ends of the main housing (9). The end plate (10) has a communicating cavity. The sealing cavity includes the inner cavity (11) and the communicating cavity. The opening (12) communicates with the communicating cavity. The liquid inlet (7) and the liquid outlet (8) are both communicating with the communicating cavity. The liquid inlet (7) is disposed on the end plate (10) at the first end of the main housing (9), and the liquid outlet (8) is disposed on the end plate (10) at the second end of the main housing (9).

4. The cell module according to claim 2, characterized in that, The sealed housing (6) includes a main housing (9) and an end plate (10). The main housing (9) includes an inner cavity (11) and openings (12) located at both ends of the main housing (9) and communicating with the inner cavity (11). The end plate (10) is disposed at both ends of the main housing (9). The liquid inlet (7) and the liquid outlet (8) are disposed on the end plate (10) and are both communicating with the inner cavity (11).

5. The battery cell module according to claim 3 or 4, characterized in that, The end of the main shell (9) is embedded in the end plate (10) and is sealed to the end plate (10).

6. The cell module according to claim 5, characterized in that, An elastic washer (17) is provided between the main shell (9) and the end plate (10). The outer wall of the main shell (9) is bonded and fixed to the inner wall of the elastic washer (17), and the outer wall of the elastic washer (17) is bonded and fixed to the inner wall of the groove of the end plate (10); or, the main shell (9) includes a first side plate (3) and a second side plate (4) arranged opposite to each other, and the first side plate (3) and the second side plate (4) are fixedly connected by a flexible connecting plate (18).

7. The battery cell module according to claim 3 or 4, characterized in that, The end plate (10) is an insulating plate, and a busbar (13) is fixedly installed on the insulating plate; and / or, the main shell (9) is a square metal shell.

8. The battery cell module according to claim 3 or 4, characterized in that, The inlet (7) and the outlet (8) are located on the top of the end plate (10), and both the inlet (7) and the outlet (8) are equipped with water pipe connectors (14).

9. The battery cell module according to any one of claims 1 to 4, characterized in that, The spring (5) is a disc spring, with the first end of the disc spring abutting against the first side plate (3) and the second end of the disc spring abutting against the second side plate (4).

10. The cell module according to claim 9, characterized in that, The multiple springs (5) are evenly arranged along the length and width of the first side plate (3).

11. The cell module according to any one of claims 1 to 4, characterized in that, Both the first side plate (3) and the second side plate (4) have grooves on the side facing the spring (5). The first end of the spring (5) is embedded in the groove of the first side plate (3), and the second end of the spring (5) is embedded in the groove of the second side plate (4).

12. A battery module, comprising a cell module, an outer side plate (15), and a strap (16), characterized in that, The battery cell module is any one of claims 1 to 11. The number of battery cell modules is multiple, and the multiple battery cell modules are stacked. Along the stacking direction of the battery cell modules, the outer side plate (15) is disposed on both sides of the stacked battery cell modules, and the strap (16) is tied to the outer side plate (15) and the battery cell modules.

13. A battery pack, characterized in that, Includes the cell module according to any one of claims 1 to 11 or the battery module according to claim 12.

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