Battery cell module, battery pack and vehicle
By using elastic buffers and end elastic components in solid-state batteries, the structural changes caused by solid-state battery expansion are solved, thereby improving the stability and safety of the cell module.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HEFEI GUOXUAN HIGH TECH POWER ENERGY
- Filing Date
- 2025-05-13
- Publication Date
- 2026-05-05
AI Technical Summary
Solid-state batteries are prone to expansion during use, which can lead to changes in the internal solid electrolyte structure, shortening their lifespan and reducing safety.
The cell module design includes elastic buffers and end elastic components. The elastic buffers are placed between adjacent solid cells, and the end elastic components are connected to the ends of the cells to restrict cell expansion. The expansion rate is controlled by applying reverse pressure through the compression buffers and end components.
Effectively controlling the volume expansion rate of solid-state battery cells avoids changes in internal structure, extends service life, and improves safety, ensuring the stability and safety of battery cell modules and battery packs.
Smart Images
Figure CN224204247U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, specifically to a cell module, a battery pack, and a vehicle. Background Technology
[0002] Solid-state batteries, as a relatively advanced battery technology, are being applied in the field of electric vehicles.
[0003] Solid-state batteries use solid electrolytes, which improve energy density compared to liquid electrolytes.
[0004] However, solid-state batteries are prone to expansion during use. When the expansion rate exceeds the limit, it will cause changes in the structure of the solid electrolyte inside the solid-state battery, thereby shortening the service life of the solid-state battery and reducing its safety. Utility Model Content
[0005] This application provides a battery cell module, a battery pack, and a vehicle. The battery cell module includes at least two stacked solid-state batteries, an elastic buffer disposed between two adjacent solid-state batteries, and an end elastic member connected to an end solid-state battery along the stacking direction of the solid-state batteries. When the battery cell module is housed within a module housing cavity and the volume of the solid-state batteries expands, the elastic buffer and end elastic member control the volume expansion rate of the solid-state batteries below a limit, thereby preventing changes in the structure of the solid electrolyte inside the solid-state batteries. This avoids shortening the lifespan of the solid-state batteries and also improves their safety.
[0006] To achieve the above objectives, this application adopts the following technical solution:
[0007] In a first aspect, this application provides a battery cell module, comprising: at least two stacked solid-state batteries, an elastic buffer, and an end elastic member. The elastic buffer is disposed between two adjacent solid-state batteries. Along the stacking direction of the solid-state batteries, the end elastic member is connected to the end of the solid-state battery cell; along the stacking direction of the solid-state batteries, the maximum size of the elastic buffer is smaller than the maximum size of the end elastic member.
[0008] As an optional implementation, the solid-state battery cell is a square battery cell, and the solid-state battery cell includes two first surfaces disposed opposite to each other; among all the surfaces of the solid-state battery cell, the first surface has the largest area;
[0009] At least two solid-state battery cells are stacked along the opposite direction of the two first surfaces; the elastic buffer is disposed between the first surfaces of two adjacent solid-state battery cells.
[0010] The number of the end elastic elements is two; along the stacking direction of the solid-state battery cell, the two end elastic elements are respectively connected to the first surface of the outermost two ends of the solid-state battery cell.
[0011] As an optional implementation, the elastic buffer is a foam layer, and the two opposite surfaces of the foam layer are respectively bonded to two adjacent solid-state battery cells;
[0012] And / or, the end elastic element is a honeycomb end plate, and the surface of the honeycomb end plate is bonded to the solid-state battery cell.
[0013] Secondly, this application provides a battery pack, the battery pack including a plurality of cell modules and a battery housing as described in any of the first aspects above. The battery housing includes a plurality of module receiving cavities; the plurality of cell modules are housed in the plurality of module receiving cavities in a one-to-one correspondence. The end elastic element of each cell module abuts against the inner wall of the corresponding module receiving cavity.
[0014] As an optional implementation, the battery box includes a frame, a partition beam, and a bottom plate; both ends of the partition beam are connected to the inner wall of the frame; the bottom end of the frame and the bottom surface of the partition beam are both connected to the surface of the bottom plate, so that the frame, the partition beam, and the bottom plate enclose and form a plurality of module receiving cavities.
[0015] As an optional implementation, the frame is a rectangular frame, which includes two oppositely arranged long side beams and two oppositely arranged short side beams;
[0016] The number of the partition beams is multiple, some of which are horizontal beams and the rest are vertical beams; the horizontal beams and the vertical beams are arranged to intersect, the axis of the horizontal beams is parallel to the axis of the short side beams, and the axis of the vertical beams is parallel to the axis of the long side beams.
[0017] The size of the module cavity is adapted to the size of the corresponding battery cell module.
[0018] As an optional implementation, the battery housing includes a first connecting assembly; the first connecting assembly includes a connecting fold plate, two first connectors, two second connectors, and two third connectors; the connecting fold plate includes a first extension section, a second extension section, and a third extension section connected in sequence; the first extension section, the second extension section, and the third extension section are respectively provided with two first connecting holes, two second connecting holes, and two third connecting holes;
[0019] The top surface of the crossbeam protrudes beyond the top surface of the longitudinal beam; the two first connectors are respectively inserted through the two first connecting holes and into the longitudinal beam; the two second connectors are respectively inserted through the two second connecting holes and into the crossbeam; the two third connectors are respectively inserted through the two third connecting holes and into the longitudinal beam.
[0020] As an optional implementation, the battery housing includes a second connecting assembly; the second connecting assembly includes a connecting base plate, a connecting protrusion plate, six fourth connecting pieces, and two fifth connecting pieces, wherein the connecting base plate and the connecting protrusion plate are fixedly connected and their surfaces are perpendicular, the connecting base plate is provided with six fourth connecting holes, and the connecting protrusion plate is provided with two fifth connecting holes;
[0021] The end of the crossbeam is hollowed out to form a connecting cavity; the six fourth connectors are respectively inserted through the six fourth connecting holes and inserted into the long side beam; the connecting protrusion is inserted into the connecting cavity; and the two fifth connectors are respectively inserted through the two fifth connecting holes and inserted into the connecting protrusion.
[0022] As an optional implementation, the side of the long beam facing away from the module receiving cavity is provided with a first lifting lug, and the side of the short beam facing away from the module receiving cavity is provided with a second lifting lug.
[0023] Both the first lifting lug and the second lifting lug are provided with lifting holes, and the number of lifting holes on the first lifting lug is greater than the number of lifting holes on the second lifting lug.
[0024] Thirdly, this application provides a vehicle that includes the battery pack described in any of the second aspects above.
[0025] Compared with the prior art, the beneficial effects of this application are at least as follows:
[0026] This battery module comprises at least two stacked solid-state cells. These solid-state cells are used to store electrical energy, thus serving as energy storage. Furthermore, solid-state cells have a higher energy density, which helps to reduce the size of the battery pack.
[0027] Because the battery cell module includes an elastic buffer and end elastic components, with the elastic buffer positioned between two adjacent solid-state batteries and the end elastic components connected to the end solid-state batteries along the stacking direction, when the battery cell module is housed within the module cavity and the solid-state batteries expand in volume along the stacking direction, both the elastic buffer and end elastic components are compressed. This applies pressure to the surface of the solid-state batteries in the opposite direction of expansion, thus limiting their expansion. When both the elastic buffer and end elastic components are compressed to their minimum volume, the volume expansion rate of the solid-state batteries does not exceed a limit. Therefore, when the solid-state batteries in the battery cell module expand, the elastic buffer and end elastic components can control the volume expansion rate below the limit, preventing changes in the structure of the solid electrolyte inside the solid-state batteries. This avoids shortening the lifespan of the solid-state batteries and improves their safety. In other words, it ensures both the lifespan and safety of the battery cell module. The material and specific dimensions of the elastic buffer and end elastic components are determined through expansion tests of the battery cell module to ensure that the elastic buffer and end elastic components can control the volume expansion rate of the solid battery cell below the limit.
[0028] Since the inner wall of the cavity housing the battery cell module is generally a rigid inner wall with high hardness, to ensure that the outer surface of the solid-state battery cell at the end is not crushed, the size of the end elastic element along the solid-state battery cell stacking direction is appropriately increased, so that the maximum size of the elastic buffer element along the solid-state battery cell stacking direction is smaller than the maximum size of the end elastic element. This effectively protects the solid-state battery cell at the end, thereby improving the stability of the battery cell module. Attached Figure Description
[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0030] Figure 1 This is a schematic diagram of the structure of a battery cell module provided in an embodiment of this application;
[0031] Figure 2 for Figure 1 Schematic diagram of the middle end elastic element;
[0032] Figure 3 This is a schematic diagram of the structure of a battery pack provided in an embodiment of this application;
[0033] Figure 4 for Figure 3Schematic diagram of the structure of the battery box;
[0034] Figure 5 for Figure 4 A schematic diagram of the structure formed after disassembling a portion of the battery box.
[0035] Figure 6 for Figure 5 A magnified view of a section at point D;
[0036] Figure 7 for Figure 5 A magnified view of a section at point E in the middle.
[0037] Explanation of reference numerals in the attached figures:
[0038] 100-Battery pack, 110-Cell module, 111-Solid-state cell, 1111-First surface, 112-Elastic buffer, 113-End elastic element, 120-Battery housing, 121-Module housing cavity, 122-Frame, 1221-Long side beam, 12211-First lifting lug, 1222-Short side beam, 12221-Second lifting lug, 1223-Lifting hole, 123-Separating beam, 124-Crossbeam, 125-Longitudinal beam, 126-Base plate, 127-First connecting assembly, 1271-Connecting folding plate, 1 2711 - First extension section, 12712 - Second extension section, 12713 - Third extension section, 12714 - First connecting hole, 12715 - Second connecting hole, 12716 - Third connecting hole, 1272 - First connector, 1273 - Second connector, 1274 - Third connector, 128 - Second connecting assembly, 1281 - Connecting base plate, 12811 - Fourth connecting hole, 1282 - Connecting protrusion plate, 12821 - Fifth connecting hole, 1283 - Fourth connector, 1284 - Fifth connector. Detailed Implementation
[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0040] Solid-state batteries, as a relatively advanced battery technology, are used in the electric vehicle field. Solid-state batteries use a solid electrolyte, which, compared to liquid electrolytes, allows for a larger internal space for energy storage, thus significantly improving energy density. However, solid-state batteries are prone to expansion during use. When the expansion rate exceeds a certain limit, it can cause changes in the structure of the solid electrolyte inside the battery, thereby shortening its lifespan and reducing its safety.
[0041] To address the aforementioned technical problems, the battery cell module provided by this utility model solves these problems by incorporating elastic buffers and end elastic components. Specifically, the battery cell module includes at least two stacked solid-state batteries. These solid-state batteries are used to store electrical energy, thus fulfilling the function of energy storage. Furthermore, solid-state batteries have a higher energy density, which helps to reduce the size of the battery pack.
[0042] Because the battery cell module includes an elastic buffer and end elastic components, with the elastic buffer positioned between two adjacent solid-state batteries and the end elastic components connected to the end solid-state batteries along the stacking direction, when the battery cell module is housed within the module cavity and the solid-state batteries expand in volume along the stacking direction, both the elastic buffer and end elastic components are compressed. This applies pressure to the surface of the solid-state batteries in the opposite direction of expansion, thus limiting their expansion. When both the elastic buffer and end elastic components are compressed to their minimum volume, the volume expansion rate of the solid-state batteries does not exceed a limit. Therefore, when the solid-state batteries in the battery cell module expand, the elastic buffer and end elastic components can control the volume expansion rate below the limit, preventing changes in the structure of the solid electrolyte inside the solid-state batteries. This avoids shortening the lifespan of the solid-state batteries and improves their safety. In other words, it ensures both the lifespan and safety of the battery cell module. The material and specific dimensions of the elastic buffer and end elastic components are determined through expansion tests of the battery cell module to ensure that the elastic buffer and end elastic components can control the volume expansion rate of the solid battery cell below the limit.
[0043] Since the inner wall of the cavity housing the battery cell module is generally a rigid inner wall with high hardness, to ensure that the outer surface of the solid-state battery cell at the end is not crushed, the size of the end elastic element along the solid-state battery cell stacking direction is appropriately increased, so that the maximum size of the elastic buffer element along the solid-state battery cell stacking direction is smaller than the maximum size of the end elastic element. This effectively protects the solid-state battery cell at the end, thereby improving the stability of the battery cell module.
[0044] The contents of this application will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can have a clearer and more detailed understanding of the contents of this application.
[0045] The following provides a detailed description of the specific structure of the aforementioned battery cell module and various possible implementation methods.
[0046] Figure 1 This is a schematic diagram of the structure of a battery cell module 110 provided in an embodiment of this application. Figure 2 for Figure 1 A schematic diagram of the structure of the mid-end elastic element 113. Figure 3 This is a schematic diagram of the structure of a battery pack 100 provided in an embodiment of this application. Figure 4 for Figure 3 A schematic diagram of the structure of the battery box 120.
[0047] See Figure 1 , Figure 2 , Figure 3 and Figure 4 The battery module 110 includes at least two stacked solid-state batteries 111, an elastic buffer 112, and an end elastic member 113. The elastic buffer 112 is disposed between two adjacent solid-state batteries 111. Along the stacking direction of the solid-state batteries 111, the end elastic member 113 is connected to the end of the solid-state battery 111; along the stacking direction of the solid-state batteries 111, the maximum size of the elastic buffer 112 is smaller than the maximum size of the end elastic member 113.
[0048] In this embodiment, the battery module 110 includes at least two stacked solid-state batteries 111. The solid-state batteries 111 are used to store electrical energy, thus playing a role in energy storage. In addition, the solid-state batteries 111 have a higher energy density, which helps to reduce the volume of the battery pack 100.
[0049] Since the battery module 110 includes an elastic buffer 112 and an end elastic member 113, the elastic buffer 112 is disposed between two adjacent solid-state batteries 111; along the stacking direction of the solid-state batteries 111, the end elastic member 113 is connected to the end of the solid-state battery 111. Thus, when the battery module 110 is housed within the module receiving cavity 121 and the solid-state batteries 111 expand in volume along the stacking direction, both the elastic buffer 112 and the end elastic member 113 are compressed, thereby applying pressure to the surface of the solid-state batteries 111 in the opposite direction of expansion, thus limiting the expansion of the solid-state batteries 111. When both the elastic buffer 112 and the end elastic member 113 are compressed to their minimum volume, the volume expansion rate of the solid-state batteries 111 does not exceed the limit. When the solid-state battery cell 111 of the battery module 110 expands in volume, the elastic buffer 112 and the end elastic member 113 can control the volume expansion rate of the solid-state battery cell 111 below the limit value. This prevents changes in the structure of the solid electrolyte inside the solid-state battery cell 111, thus avoiding shortening the service life of the solid-state battery cell 111 and improving its safety. In other words, this ensures the service life of the battery module 110 and improves its safety. The material and specific dimensions of the elastic buffer 112 and the end elastic member 113 are determined through expansion tests of the battery module 110 to ensure that the elastic buffer 112 and the end elastic member 113 can control the volume expansion rate of the solid-state battery cell 111 below the limit value.
[0050] Since the inner wall of the module housing cavity 121 that houses the battery cell module 110 is generally a rigid inner wall with high hardness, in order to ensure that the outer surface of the solid-state battery cell 111 at the end is not crushed, the size of the end elastic member 113 along the stacking direction of the solid-state battery cell 111 is appropriately increased, so that the maximum size of the elastic buffer member 112 along the stacking direction of the solid-state battery cell 111 is smaller than the maximum size of the end elastic member 113. This can effectively protect the solid-state battery cell 111 at the end, thereby improving the stability of the battery cell module 110.
[0051] It should be noted that the number of solid-state battery cells 111 can be two, three, or more, and this application embodiment does not limit this. In a specific battery cell module 110, the number of solid-state battery cells 111 is 11, and the corresponding number of elastic buffer members 112 is 10.
[0052] It should also be noted that the maximum size of the elastic buffer 112 mentioned above refers to the size of the elastic buffer 112 when it is in a fully extended state. The maximum size of the end elastic member 113 mentioned above refers to the size of the end elastic member 113 when it is in a fully extended state.
[0053] As an optional implementation, in some embodiments, see [link to relevant documentation]. Figure 1 , Figure 2 , Figure 3 and Figure 4 The solid-state battery cell 111 is a square cell, and includes two opposing first surfaces 1111; among all the surfaces of the solid-state battery cell 111, the first surface 1111 has the largest area. At least two solid-state batteries 111 are stacked along the opposing direction of the two first surfaces 1111; an elastic buffer 112 is disposed between the first surfaces 1111 of two adjacent solid-state batteries 111. There are two end elastic members 113; along the stacking direction of the solid-state batteries 111, the two end elastic members 113 are respectively connected to the first surfaces 1111 of the outermost two solid-state batteries 111.
[0054] In this embodiment, since the solid-state battery cell 111 is a square cell, the battery cell module 110 formed by stacking the solid-state battery cells 111 is also square, which facilitates the spatial arrangement within the battery pack 100, helps to reduce the volume of the battery pack 100, and thus helps to improve the energy density of the battery pack 100.
[0055] Since the solid-state battery cell 111 includes two opposing first surfaces 1111, the first surface 1111 has the largest area among all the surfaces of the solid-state battery cell 111. At least two solid-state battery cells 111 are stacked along the opposing direction of the two first surfaces 1111; an elastic buffer 112 is disposed between the first surfaces 1111 of two adjacent solid-state battery cells 111. Compared to disposing the elastic buffer 112 between other surfaces of two adjacent solid-state battery cells 111, this increases the pressure on the solid-state battery cell 111 in the opposite direction of expansion, thereby more effectively limiting the volume expansion of the solid-state battery cell 111.
[0056] Since there are two end elastic members 113, along the stacking direction of the solid-state battery cells 111, the two end elastic members 113 are respectively connected to the first surfaces 1111 of the outermost two solid-state battery cells 111. Thus, when the battery cell module 110 is housed in the module receiving cavity 121, the end elastic members 113 are sandwiched between the first surfaces 1111 of the solid-state battery cells 111 and the inner wall of the module receiving cavity 121. Compared to sandwiching the end elastic members 113 between the other surfaces of the solid-state battery cells 111 and the inner wall of the module receiving cavity 121, this increases the pressure on the solid-state battery cells 111 at both ends, opposite to the expansion direction, thereby more effectively limiting the expansion of the solid-state battery cells 111. Furthermore, the two end elastic members 113 can apply pressure to the solid-state battery cells 111 from the outermost two ends of the battery cell module 110, thereby keeping the outermost two ends of the battery cell module 110 in a balanced state, which helps to improve the stability of the battery cell module 110.
[0057] As an optional implementation, in some embodiments, see [link to relevant documentation]. Figure 1 , Figure 2 , Figure 3 and Figure 4 The elastic buffer 112 is a foam layer, and its two opposing surfaces are bonded to two adjacent solid-state battery cells 111. Expansion tests on the battery cell module 110 have confirmed that when the elastic buffer 112 is a foam layer, it can meet the pressure applied by the elastic buffer 112 to the solid-state battery cells 111, thereby ensuring that the volume expansion rate of the solid-state battery cells 111 is controlled below the limit. Furthermore, since the foam layer is less expensive, it can reduce the production cost of the battery cell module 110.
[0058] Alternatively, the end elastic element 113 can be a honeycomb end plate, with its surface bonded to the solid-state battery cell 111. Expansion tests on the battery cell module 110 have confirmed that when the end elastic element 113 is a honeycomb end plate, it can meet the pressure applied by the end elastic element 113 to the solid-state battery cell 111, thus ensuring that the volume expansion rate of the solid-state battery cell 111 is controlled below the limit. Furthermore, because the honeycomb end plate has numerous pores, it facilitates heat dissipation from the battery cell module 110, thereby reducing the temperature of the battery cell module 110 and keeping it within a reasonable temperature range. The honeycomb end plate is made of plastic.
[0059] It should be noted that the aforementioned elastic buffer 112 can be made of other types of elastic materials besides foam, and this application embodiment does not limit this. Similarly, the aforementioned end elastic element 113 can be made of other types of elastic materials besides honeycomb end plates, and this application embodiment does not limit this.
[0060] See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 This application also provides a battery pack 100, which includes a plurality of the aforementioned cell modules 110 and a battery housing 120. The battery housing 120 includes a plurality of module receiving cavities 121; the plurality of cell modules 110 are correspondingly housed in the plurality of module receiving cavities 121. The end elastic member 113 of each cell module 110 abuts against the inner wall of the corresponding module receiving cavity 121.
[0061] In this embodiment, the battery module 110 includes at least two stacked solid-state cells 111. The solid-state cells 111 are used to store electrical energy, thus playing the role of energy storage. In addition, the solid-state cells 111 have a higher energy density, which helps to reduce the volume of the battery pack 100, that is, it can increase the energy density of the battery pack 100.
[0062] Since the battery module 110 includes an elastic buffer 112 and an end elastic member 113, the elastic buffer 112 is disposed between two adjacent solid-state batteries 111; along the stacking direction of the solid-state batteries 111, the end elastic member 113 is connected to the end of the solid-state battery 111. Thus, when the battery module 110 is housed within the module receiving cavity 121 and the solid-state batteries 111 expand in volume along the stacking direction, both the elastic buffer 112 and the end elastic member 113 are compressed, thereby applying pressure to the surface of the solid-state batteries 111 in the opposite direction of expansion, thus limiting the expansion of the solid-state batteries 111. When both the elastic buffer 112 and the end elastic member 113 are compressed to their minimum volume, the volume expansion rate of the solid-state batteries 111 does not exceed a limit. When the solid-state battery cell 111 of the battery cell module 110 expands in volume, the elastic buffer 112 and the end elastic member 113 can control the volume expansion rate of the solid-state battery cell 111 below the limit value. This prevents changes in the structure of the solid electrolyte inside the solid-state battery cell 111, thus avoiding shortening the service life of the solid-state battery cell 111 and improving its safety. In other words, by ensuring the service life of the battery cell module 110 and improving its safety, the service life of the battery pack 100 can also be ensured and its safety improved. The material and specific dimensions of the elastic buffer 112 and the end elastic member 113 are determined through expansion tests of the battery cell module 110 to ensure that the elastic buffer 112 and the end elastic member 113 can control the volume expansion rate of the solid-state battery cell 111 below the limit value.
[0063] Since the inner wall of the module housing cavity 121 accommodating the battery cell module 110 is generally a rigid inner wall with high hardness, in order to ensure that the outer surface of the solid-state battery cell 111 at the end is not crushed, the size of the end elastic member 113 along the stacking direction of the solid-state battery cell 111 is appropriately increased, so that the maximum size of the elastic buffer member 112 along the stacking direction of the solid-state battery cell 111 is smaller than the maximum size of the end elastic member 113. This can effectively protect the solid-state battery cell 111 at the end, thereby improving the stability of the battery cell module 110, and thus improving the stability of the battery pack 100.
[0064] Since the battery pack 100 includes multiple cell modules 110 and the battery housing 120 includes multiple module receiving cavities 121, with each cell module 110 housed in a corresponding cavity, this increases the total capacity of the battery pack 100 while ensuring that each cell module 110 is located in its own space. This prevents the multiple cell modules 110 from interfering with each other, thus improving the stability of the battery pack 100. Furthermore, since the end elastic element 113 of each cell module 110 abuts against the inner wall of the corresponding module receiving cavity 121, when the solid cell 111 at the end expands in volume, the end elastic element 113 can promptly apply pressure opposite to the direction of expansion to the solid cell 111, thus helping to limit the expansion of the solid cell 111.
[0065] As an optional implementation, in some embodiments, see [link to relevant documentation]. Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The battery box 120 includes a frame 122, a partition beam 123, and a base plate 126. The two ends of the partition beam 123 are respectively connected to the inner wall of the frame 122. The bottom end of the frame 122 and the bottom surface of the partition beam 123 are both connected to the surface of the base plate 126, so that the frame 122, the partition beam 123, and the base plate 126 enclose and form multiple module receiving cavities 121.
[0066] In this embodiment, since both ends of the partition beam 123 are connected to the inner wall of the frame 122, they form the skeleton of the battery box 120, thereby increasing the strength of the battery box 120 and enhancing the protection of the internal cell modules 110. Since the bottom end of the frame 122 and the bottom surface of the partition beam 123 are both connected to the surface of the base plate 126, the frame 122, partition beam 123, and base plate 126 enclose multiple module receiving cavities 121. Adjacent module receiving cavities 121 are separated by the partition beam 123, which provides good isolation, further reducing the mutual influence between the multiple cell modules 110 and thus further improving the stability of the battery pack 100.
[0067] It should be noted that the battery housing 120 is made of aluminum profile or aluminum alloy profile, or other types of materials. This application embodiment does not limit this.
[0068] As an optional implementation, in some embodiments, see [link to relevant documentation]. Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5The frame 122 is a rectangular frame, which includes two oppositely arranged long side beams 1221 and two oppositely arranged short side beams 1222. There are multiple partition beams 123; some are horizontal beams 124, and the rest are vertical beams 125. The horizontal beams 124 and vertical beams 125 are arranged intersectingly, with the axis of the horizontal beam 124 parallel to the axis of the short side beam 1222, and the axis of the vertical beam 125 parallel to the axis of the long side beam 1221. The dimensions of the module receiving cavity 121 are adapted to the dimensions of the corresponding battery cell module 110.
[0069] In this embodiment, since the frame 122 is a rectangular frame, the shape of the battery pack 100 is more regular, which is beneficial to the overall layout of the vehicle interior space when the battery pack 100 is installed in the vehicle.
[0070] Since there are multiple partition beams 123, some of them are horizontal beams 124, and the rest are vertical beams 125. The horizontal beams 124 and vertical beams 125 are arranged intersectingly, with the axis of the horizontal beam 124 parallel to the axis of the short side beam 1222, and the axis of the vertical beam 125 parallel to the axis of the long side beam 1221. This ensures that the enclosed module cavities 121 are all square cavities, which allows for better matching when the solid-state battery cell 111 is a square battery cell.
[0071] Because the size of the module receiving cavity 121 is adapted to the size of the corresponding cell module 110, when the cell module 110 is housed in the module receiving cavity 121, the cell module 110 will not move relative to the module receiving cavity 121, thereby improving the stability of the battery pack 100.
[0072] In a specific battery pack 100, there is one crossbeam 124 and two longitudinal beams 125. The crossbeam 124 and the two longitudinal beams 125 enclose six square module receiving cavities 121, which respectively accommodate six square battery cell modules 110.
[0073] As an optional implementation, in some embodiments, see [link to relevant documentation]. Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6The battery housing 120 includes a first connecting assembly 127; the first connecting assembly 127 includes a connecting folding plate 1271, two first connecting members 1272, two second connecting members 1273 and two third connecting members 1274; the connecting folding plate 1271 includes a first extension section 12711, a second extension section 12712 and a third extension section 12713 connected in sequence; the first extension section 12711, the second extension section 12712 and the third extension section 12713 are respectively provided with two first connecting holes 12714, two second connecting holes 12715 and two third connecting holes 12716. The top surface of the crossbeam 124 protrudes from the top surface of the longitudinal beam 125; two first connectors 1272 are respectively inserted through two first connecting holes 12714 and inserted into the longitudinal beam 125; two second connectors 1273 are respectively inserted through two second connecting holes 12715 and inserted into the crossbeam 124; two third connectors 1274 are respectively inserted through two third connecting holes 12716 and inserted into the longitudinal beam 125.
[0074] In this way, the first connecting assembly 127 connects the connecting plate 1271 to one side of the longitudinal beam 125 via two first connecting pieces 1272, connects the connecting plate 1271 to the crossbeam 124 via two second connecting pieces 1273, and connects the connecting plate 1271 to the other side of the longitudinal beam 125 via two third connecting pieces 1274. This connects the crossbeam 124 and the longitudinal beam 125 at their intersection. Compared to welding, connecting the crossbeam 124 and the longitudinal beam 125 via the first connecting assembly 127 allows for appropriate deformation of the module housing 121, facilitating a suitable volume expansion of the cell module 110, thus benefiting the normal operation of the battery pack 100.
[0075] As an optional implementation, in some embodiments, see [link to relevant documentation]. Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 7 The battery housing 120 includes a second connecting assembly 128; the second connecting assembly 128 includes a connecting base plate 1281, a connecting protrusion plate 1282, six fourth connecting pieces 1283, and two fifth connecting pieces 1284. The connecting base plate 1281 and the connecting protrusion plate 1282 are fixedly connected and their surfaces are perpendicular. The connecting base plate 1281 is provided with six fourth connecting holes 12811, and the connecting protrusion plate 1282 is provided with two fifth connecting holes 12821. The end of the crossbeam 124 is hollowed out to form a connecting cavity; the six fourth connecting pieces 1283 are respectively inserted through the six fourth connecting holes 12811 and inserted into the long side beam 1221, the connecting protrusion plate 1282 is inserted into the connecting cavity, and the two fifth connecting pieces 1284 are respectively inserted through the two fifth connecting holes 12821 and inserted into the connecting protrusion plate 1282.
[0076] In this way, the second connecting assembly 128 connects the connecting base plate 1281 to the long side beam 1221 through six fourth connecting pieces 1283, and connects the connecting protrusion plate 1282 and the end of the crossbeam 124 through two fifth connecting pieces 1284. This connects the ends of the long side beam 1221 and the crossbeam 124. Compared to welding, connecting the ends of the long side beam 1221 and the crossbeam 124 through the second connecting assembly 128 allows for appropriate deformation of the module housing cavity 121, facilitating a suitable volume expansion of the cell module 110, thus further benefiting the normal operation of the battery pack 100.
[0077] It should be noted that the first connector 1272, the second connector 1273, the third connector 1274, the fourth connector 1283 and the fifth connector 1284 mentioned above can be screws or rivets, or other types of connectors. This application embodiment does not limit this.
[0078] As an optional implementation, in some embodiments, see [link to relevant documentation]. Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The long side beam 1221 has a first lifting lug 12211 on the side facing away from the module receiving cavity 121, and the short side beam 1222 has a second lifting lug 12221 on the side facing away from the module receiving cavity 121. Both the first lifting lug 12211 and the second lifting lug 12221 have lifting holes 1223, and the number of lifting holes 1223 on the first lifting lug 12211 is greater than the number of lifting holes 1223 on the second lifting lug 12221.
[0079] In this embodiment, in the cell module 110 near the long side beam 1221, the first surface 1111 of the solid-state cell 111 at the end is connected to the inner wall of the long side beam 1221 via an end elastic member 113. This primarily applies pressure to the first surface 1111 of the solid-state cell 111 through the inner wall of the long side beam 1221, thus limiting expansion. Therefore, the greater the stiffness of the long side beam 1221, the smaller the deformation of the solid-state cell 111. In other words, the greater the pressure that the inner wall of the long side beam 1221 can apply, the better the effect of limiting the volume expansion of the solid-state cell 111.
[0080] Since both the first lifting lug 12211 and the second lifting lug 12221 are provided with lifting holes 1223, and the number of lifting holes 1223 on the first lifting lug 12211 is greater than the number of lifting holes 1223 on the second lifting lug 12221, when the battery pack 100 is lifted through the lifting holes 1223...
[0081] The longer beam 1221 experiences greater constraint forces, making it less prone to deformation, thus exhibiting greater stiffness. This allows for greater pressure to be applied to the inner wall of the longer beam 1221, thereby better limiting the volume expansion of the solid-state cell 111.
[0082] Within a specific battery pack 100, there is one crossbeam 124 and two longitudinal beams 125. The crossbeam 124 and the two longitudinal beams 125 enclose six square module receiving cavities 121, which respectively accommodate six square battery cell modules 110. The first lifting lug 12211 on the long side beam 1221 has four lifting holes 1223, and the second lifting lug 12221 on the short side beam 1222 has two lifting holes 1223.
[0083] See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 This application also provides a vehicle that includes any of the above-described battery packs 100.
[0084] In this embodiment, the battery module 110 includes at least two stacked solid-state cells 111. The solid-state cells 111 are used to store electrical energy, thus playing the role of energy storage. In addition, the solid-state cells 111 have a higher energy density, which helps to reduce the volume of the battery pack 100, that is, it can increase the energy density of the battery pack 100, thereby increasing the driving range of the vehicle.
[0085] Since the battery module 110 includes an elastic buffer 112 and an end elastic member 113, the elastic buffer 112 is disposed between two adjacent solid-state batteries 111; along the stacking direction of the solid-state batteries 111, the end elastic member 113 is connected to the end of the solid-state battery 111. Thus, when the battery module 110 is housed within the module receiving cavity 121 and the solid-state batteries 111 expand in volume along the stacking direction, both the elastic buffer 112 and the end elastic member 113 are compressed, thereby applying pressure to the surface of the solid-state batteries 111 in the opposite direction of expansion, thus limiting the expansion of the solid-state batteries 111. When both the elastic buffer 112 and the end elastic member 113 are compressed to their minimum volume, the volume expansion rate of the solid-state batteries 111 does not exceed a limit. In this way, when the volume of the solid-state cell 111 in the cell module 110 expands, the elastic buffer 112 and the end elastic element 113 can control the volume expansion rate of the solid-state cell 111 below the limit value, thereby preventing changes in the structure of the solid electrolyte inside the solid-state cell 111. This avoids shortening the service life of the solid-state cell 111 and also improves its safety. In other words, by ensuring the service life and improving the safety of the cell module 110, the service life and safety of the battery pack 100 can be guaranteed, thus improving the safety of the vehicle while ensuring its service life.
[0086] The material and specific dimensions of the elastic buffer 112 and the end elastic member 113 are determined by the expansion test of the cell module 110 to ensure that the elastic buffer 112 and the end elastic member 113 can control the volume expansion rate of the solid cell 111 below the limit.
[0087] Since the inner wall of the module housing cavity 121 accommodating the battery cell module 110 is generally a rigid inner wall with high hardness, in order to ensure that the outer surface of the solid-state battery cell 111 at the end is not crushed, the size of the end elastic member 113 along the stacking direction of the solid-state battery cell 111 is appropriately increased, so that the maximum size of the elastic buffer member 112 along the stacking direction of the solid-state battery cell 111 is smaller than the maximum size of the end elastic member 113. This can effectively protect the solid-state battery cell 111 at the end, thereby improving the stability of the battery cell module 110, thus improving the stability of the battery pack 100, and consequently improving the stability of the vehicle.
[0088] Because the battery pack 100 includes multiple cell modules 110, and the battery housing 120 includes multiple module receiving cavities 121, with each cell module 110 housed in a corresponding cavity 121, this increases the total capacity of the battery pack 100 while ensuring that each cell module 110 is located in its own space. This prevents the multiple cell modules 110 from interfering with each other, thus improving the stability of the battery pack 100 and further enhancing the stability of the vehicle.
[0089] It should be noted that the aforementioned vehicles are electric vehicles or hybrid electric vehicles. Specifically, they can be sedans, SUVs, or buses, or other types of vehicles. This application embodiment does not limit this.
[0090] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.
[0091] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.
[0092] It should be readily understood that the terms “on,” “above,” and “on top of” in this application should be interpreted in the broadest possible sense, such that “on” means not only “directly on something,” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “above something” or “on top of something,” but also “on something” or “on top of something” without an intermediate feature or layer therebetween, i.e., directly on something.
[0093] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations rotated 90° or be in other orientations, and the spatially relative descriptive terms used herein may be interpreted accordingly.
[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. A battery cell module, characterized in that, include: At least two stacked solid-state cells (111); An elastic buffer (112) is disposed between two adjacent solid-state cells (111); An end elastic member (113) is connected to the end of the solid-state battery cell (111) along the stacking direction of the solid-state battery cell (111); along the stacking direction of the solid-state battery cell (111), the maximum size of the elastic buffer member (112) is smaller than the maximum size of the end elastic member (113).
2. The battery cell module according to claim 1, characterized in that, The solid-state battery cell (111) is a square battery cell, and the solid-state battery cell (111) includes two first surfaces (1111) arranged opposite to each other; among all the surfaces of the solid-state battery cell (111), the first surface (1111) has the largest area; At least two solid-state cells (111) are stacked along the opposite directions of the two first surfaces (1111); the elastic buffer (112) is disposed between the first surfaces (1111) of two adjacent solid-state cells (111); The number of the end elastic members (113) is two; along the stacking direction of the solid battery cell (111), the two end elastic members (113) are respectively connected to the first surface (1111) of the outermost two ends of the solid battery cell (111).
3. The cell module according to claim 1, characterized in that, The elastic buffer (112) is a foam layer, and the two opposite surfaces of the foam layer are respectively bonded to the two adjacent solid cells (111); And / or, the end elastic element (113) is a honeycomb end plate, and the surface of the honeycomb end plate is bonded to the solid cell (111).
4. A battery pack, characterized in that, include: The battery cell module according to any one of claims 1-3; The battery housing (120) includes multiple module receiving cavities (121); multiple battery cell modules are housed in the multiple module receiving cavities (121) in a corresponding manner; the end elastic element (113) of each battery cell module abuts against the inner wall of the corresponding module receiving cavity (121).
5. The battery pack according to claim 4, characterized in that, The battery box (120) includes a frame (122), a partition beam (123), and a base plate (126); the two ends of the partition beam (123) are respectively connected to the inner wall of the frame (122); the bottom end of the frame (122) and the bottom surface of the partition beam (123) are both connected to the surface of the base plate (126), so that the frame (122), the partition beam (123), and the base plate (126) enclose and form a plurality of module receiving cavities (121).
6. The battery pack according to claim 5, characterized in that, The frame (122) is a rectangular frame, which includes two oppositely arranged long side beams (1221) and two oppositely arranged short side beams (1222); The number of the partition beams (123) is multiple, some of which are horizontal beams (124), and the remaining number of partition beams (123) are vertical beams (125); the horizontal beams (124) and the vertical beams (125) are arranged to cross each other, the axis of the horizontal beams (124) is parallel to the axis of the short side beam (1222), and the axis of the vertical beams (125) is parallel to the axis of the long side beam (1221); The dimensions of the module receiving cavity (121) are adapted to the dimensions of the corresponding battery cell module.
7. The battery pack according to claim 6, characterized in that, The battery housing (120) includes a first connecting assembly (127); the first connecting assembly (127) includes a connecting fold plate (1271), two first connectors (1272), two second connectors (1273) and two third connectors (1274); the connecting fold plate (1271) includes a first extension segment (12711), a second extension segment (12712) and a third extension segment (12713) connected in sequence; the first extension segment (12711), the second extension segment (12712) and the third extension segment (12713) are respectively provided with two first connecting holes (12714), two second connecting holes (12715) and two third connecting holes (12716); The top surface of the crossbeam (124) protrudes from the top surface of the longitudinal beam (125); two first connectors (1272) are respectively inserted through two first connecting holes (12714) and inserted into the longitudinal beam (125); two second connectors (1273) are respectively inserted through two second connecting holes (12715) and inserted into the crossbeam (124); two third connectors (1274) are respectively inserted through two third connecting holes (12716) and inserted into the longitudinal beam (125).
8. The battery pack according to claim 6, characterized in that, The battery housing (120) includes a second connecting assembly (128); the second connecting assembly (128) includes a connecting base plate (1281), a connecting protrusion plate (1282), six fourth connecting pieces (1283), and two fifth connecting pieces (1284). The connecting base plate (1281) and the connecting protrusion plate (1282) are fixedly connected and their surfaces are perpendicular. The connecting base plate (1281) is provided with six fourth connecting holes (12811), and the connecting protrusion plate (1282) is provided with two fifth connecting holes (12821). The end of the crossbeam (124) is hollowed out to form a connecting cavity; the six fourth connectors (1283) are respectively inserted through the six fourth connecting holes (12811) and inserted into the long side beam (1221); the connecting protrusion plate (1282) is inserted into the connecting cavity; and the two fifth connectors (1284) are respectively inserted through the two fifth connecting holes (12821) and inserted into the connecting protrusion plate (1282).
9. The battery pack according to claim 6, characterized in that, The long side beam (1221) is provided with a first lifting lug (12211) on the side facing away from the module receiving cavity (121), and the short side beam (1222) is provided with a second lifting lug (12221) on the side facing away from the module receiving cavity (121). Both the first lifting lug (12211) and the second lifting lug (12221) are provided with lifting holes (1223), and the number of lifting holes (1223) on the first lifting lug (12211) is greater than the number of lifting holes (1223) on the second lifting lug (12221).
10. A vehicle, characterized in that, Includes the battery pack as described in any one of claims 4-9.