Battery module, battery pack, electric equipment and vehicle

Abstract

The utility model discloses a battery module, a battery pack, electric equipment and a vehicle. The battery module comprises a binding piece and a plurality of solid-state battery cell units arranged in the binding piece, and adjacent solid-state battery cell units in the plurality of solid-state battery cell units are connected through battery cell tabs. By the adoption of the battery module, expansion of the solid-state battery cell units can be restrained, meanwhile, the weight of the battery module is reduced, and the energy density and the integration degree of the battery module are improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery module, a battery pack, an electrical device and a vehicle. Background Art

[0002] With the development of battery technology, solid-state batteries gradually use solid electrolytes to replace flammable and explosive organic electrolytes, which effectively improves the safety of batteries. Solid-state batteries are often packaged in soft packages, that is, they are packaged in aluminum-plastic films. However, the aluminum-plastic film has poor binding capacity for batteries and is difficult to suppress the expansion of the battery during use, which can easily lead to a decrease in battery performance.

[0003] At present, strapping tape is often used to suppress the expansion of all battery cells in a battery module. At the same time, additional structural support members are provided between the battery cells to suppress the expansion of each battery cell, and connectors are provided to connect the battery cells in series, which makes the battery module structure complex and the degree of integration low. Utility Model Content

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a battery module, a battery pack, an electrical device and a vehicle that can suppress the expansion of solid-state battery cells, while reducing the weight of the battery module and improving the energy density and integration level of the battery module.

[0005] In a first aspect, the present application provides a battery module, which includes a restraining member and a plurality of solid-state battery cells disposed in the restraining member, wherein adjacent solid-state battery cells in the plurality of solid-state battery cells are connected via battery cell tabs.

[0006] In combination with the first aspect, in a possible implementation, the restraining member is provided with tab extension holes at both ends along the arrangement direction of the multiple solid-state battery cell units, respectively, and the tab extension holes are used to expose the battery tabs of the solid-state battery cell units at both ends of the multiple solid-state battery cell units.

[0007] In combination with the first aspect, in one possible implementation, the difference between the length of the restraining member along the first direction and the sum of the lengths of the multiple solid-state battery cell units along the first direction is less than a first preset threshold; the first direction is the arrangement direction of the multiple solid-state battery cell units; and / or the difference between the length of the restraining member along the second direction and the length of the solid-state battery cell units along the second direction is less than a second preset threshold; the second direction is a direction perpendicular to the first direction on the extension surface of the pole ear.

[0008] In combination with the first aspect, in a possible implementation manner, an elastic member is filled between the restraining member and the plurality of solid-state battery core units.

[0009] In combination with the first aspect, in a possible implementation manner, an elastic member is filled between the side surface of the solid-state battery cell unit parallel to the extension surface of the pole ear and the inner wall of the restraining member.

[0010] In a second aspect, the present application further provides a battery pack, which includes the battery module described in the first aspect and any one of the first aspects.

[0011] In combination with the second aspect, in a possible implementation, a plurality of battery modules are arranged along a direction perpendicular to an extension surface of the tab.

[0012] In combination with the second aspect, in a possible implementation, the battery pack further includes a bus bar having a plurality of mounting holes along an arrangement direction of the plurality of battery modules.

[0013] In combination with the second aspect, in a possible implementation, the battery pack further includes a pole, and the pole is connected to a pole ear exposed outside the restraining member of the battery module.

[0014] In combination with the second aspect, in a possible implementation, the sizes of the mounting holes of the pole and the busbar match, and when the pole is arranged in the mounting hole of the busbar, a plurality of battery modules are connected to the busbar.

[0015] In combination with the second aspect, in a possible implementation, the battery pack also includes an upper cover plate, a lower base plate, a first support plate and a second support plate, the upper cover plate and the lower base plate are respectively arranged on both sides of the multiple battery modules along the second direction, the first support plate and the second support plate are respectively arranged on both sides of the multiple battery modules along the third direction, the upper cover plate, the lower base plate, the first support plate and the second support plate are respectively fixedly connected to the bus; the third direction is a direction perpendicular to the extension surface of the pole ear.

[0016] In combination with the second aspect, in a possible implementation, a surface of the plurality of battery modules close to the lower base plate is coated with a heat conductive layer, or a surface of the lower base plate close to the battery modules is coated with a heat conductive layer.

[0017] In a third aspect, the present application further provides an electrical device, which comprises the battery pack described in the second aspect and any one of the second aspects.

[0018] In a fourth aspect, the present application further provides a vehicle, comprising a battery pack as described in the second aspect and any one of the second aspects above, wherein the battery pack is connected to a load of the vehicle.

[0019] The embodiments of the present application provide a battery module, a battery pack, an electrical device and a vehicle. The battery module includes a restraining member and a plurality of solid-state battery cell units disposed in the restraining member, wherein adjacent solid-state battery cell units in the plurality of solid-state battery cell units are connected via battery cell tabs. The embodiments of the present application realize the series connection between adjacent solid-state battery cell units through the battery cell tab connection, and uniformly restrain the plurality of solid-state battery cell units through a restraining member, that is, a restraining member simultaneously provides restraining force in the side surrounding areas of the plurality of solid-state battery cell units that are prone to expansion, and on the basis of achieving the suppression of the expansion of the solid-state battery cell units, the connecting pieces, structural support members and other components between the plurality of solid-state battery cell units in the restraining member and the space occupied by the components are omitted, thereby effectively reducing the weight of the battery module and improving the energy density and integration of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0021] Figure 1 A schematic diagram of the structure of a battery module in one embodiment;

[0022] Figure 2 Another structural schematic diagram of a battery module in one embodiment;

[0023] Figure 3 is a schematic diagram of the structure of a battery pack in one embodiment;

[0024] Figure 4 FIG. 4 is a schematic diagram of the structure of a bus bar in an embodiment.

[0025] Description of reference numerals:

[0026] 10 - battery module, 11 - restraint, 12 - solid-state battery cell unit, 13 - battery cell tab, 14 - tab extension hole, 20 - bus bar, 21 - mounting hole, 30 - pole, 40 - upper cover plate, 50 - lower cover plate, 60 - first support plate, 70 - second support plate. DETAILED DESCRIPTION

[0027] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It is also necessary to explain that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings.

[0028] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. In addition, the term "and / or" herein is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0034] With the development of battery technology, solid-state batteries are gradually using solid electrolytes to replace flammable and explosive organic electrolytes, effectively improving the safety of batteries. At present, solid-state batteries are often packaged in soft packages, that is, they are packaged in aluminum-plastic films.

[0035] Soft-pack batteries have low strength and poor battery restraint ability. On the one hand, it affects the contact between the electrolyte layer and the electrode inside the battery cell, affecting the performance of the battery cell. On the other hand, it is difficult to suppress the expansion of the battery cell during the cycle, resulting in shell deformation, battery cell damage, reduced battery capacity and other problems.

[0036] Furthermore, it is necessary to improve the strength of the battery through structural supports, but structural supports add many components, reduce the integration of the battery, and also reduce the energy density of the battery; external mechanical fixing devices are needed to provide restraint force to inhibit the expansion of the solid-state battery, but this will reduce the energy density of the battery.

[0037] In order to solve the above problems, an embodiment of the present application provides a battery module, which can suppress the expansion of battery cells, while improving the integration level of the battery module and ensuring the energy density of the battery module.

[0038] In one embodiment, Figure 1 As shown, a battery module 10 is provided. The battery module 10 includes a restraining member 11 and a plurality of solid-state battery cell units 12 disposed in the restraining member 11 . Adjacent solid-state battery cell units 12 in the plurality of solid-state battery cell units 12 are connected via battery cell tabs 13 .

[0039] In the embodiment of the present application, a plurality of solid-state battery cells 12 can be connected in series and placed in the internal space of the restraining member 11. The restraining member 11 can provide restraining force for the plurality of solid-state battery cells 12 to suppress the expansion of the plurality of solid-state battery cells 12 during use. That is, in the present application, a plurality of solid-state battery cells 12 are arranged in a restraining member 11, so that the battery module 10 forms a blade battery structure. A restraining member 11 provides restraining force for a plurality of solid-state battery cells 12 at the same time. On the basis of suppressing the expansion of a plurality of solid-state battery cells 12, structural support members and other components between the solid-state battery cells 12 are omitted, thereby reducing the weight of the battery module 10 and improving the energy density of the battery module 10. Furthermore, the space occupied by structural support members and other components between the solid-state battery cells 12 is omitted, thereby improving the integration level of the battery module 10.

[0040] The restraining member 11 may be an aluminum shell.

[0041] In a possible implementation, adjacent solid-state battery cells 12 in a plurality of solid-state battery cells 12 can be connected in a bipolar stacking manner, for example, by laser welding the pole ears of adjacent solid-state battery cells 12, so that adjacent solid-state battery cells 12 are connected in series, thereby eliminating components such as connecting sheets between a plurality of solid-state battery cells 12 connected in series, reducing the weight of the battery module 10, and improving the energy density of the battery module 10. Furthermore, the space occupied by components such as connecting sheets is eliminated, and the integration level of the battery module 10 is improved. At the same time, the internal resistance of the battery module 10 can be reduced to a certain extent, and the heat generated by the battery module 10 can be reduced.

[0042] Moreover, the voltage of the battery module 10 composed of multiple solid-state battery cells 12 connected in series is the sum of the voltages of the multiple solid-state battery cells 12, so that the battery module 10 can be used in electrical equipment with high voltage requirements, thereby increasing the application range of the battery module 10.

[0043] In one possible implementation, the difference between the length of the restraining member 11 along the first direction and the sum of the lengths of the multiple solid-state battery cell units 12 along the first direction is less than a first preset threshold; and / or the difference between the length of the restraining member 11 along the second direction and the length of the solid-state battery cell units 12 along the second direction is less than a second preset threshold.

[0044] The first direction is the arrangement direction of the multiple solid-state battery cells, that is, the x direction or the opposite direction of the x direction, which can also be called the length direction of the restraint 11 or the battery module 10; the second direction is the direction perpendicular to the arrangement direction of the multiple solid-state battery cells on the extension surface of the pole ear, that is, the y direction or the opposite direction of the y direction, which can also be called the width direction of the restraint 11 or the battery module 10. The extension surface of the pole ear is the surface where the pole ear of the solid-state battery cell 12 extends out of the restraint 11, that is, the plane where x and y are located.

[0045] It can be understood that the z direction or the opposite direction of the z direction can be referred to as the thickness direction of the restraining member 11 or the battery module 10 .

[0046] In the embodiment of the present application, the difference between the length of the restraint 11 and the sum of the lengths of the plurality of solid-state battery cells 12 in the restraint 11 is less than the first preset threshold, and the difference between the width of the restraint 11 and the width of the solid-state battery cell 12 in the restraint 11 is less than the second preset threshold, and at least one of the two is satisfied; further, the difference between the thickness of the restraint 11 and the thickness of the solid-state battery cell 12 in the restraint 11 can be less than the third preset threshold. That is, the distance between each side surface of the solid-state battery cell 12 in the restraint 11 and the inner wall of the restraint 11 is limited to a certain range, so as to avoid the restraint 11 being unable to provide sufficient restraint force for the solid-state battery cell 12 due to the distance being too large, thereby ensuring the expansion suppression effect of the restraint 11.

[0047] The embodiment of the present application provides a battery module, which includes a restraining member and a plurality of solid-state battery cell units arranged in the restraining member, wherein adjacent solid-state battery cell units among the plurality of solid-state battery cell units are connected by battery cell tabs. The embodiment of the present application realizes the series connection between adjacent solid-state battery cell units by connecting the battery cell tabs, and uniformly restrains the plurality of solid-state battery cell units by a restraining member, that is, a restraining member simultaneously provides restraining force in the side surrounding areas where the plurality of solid-state battery cell units are prone to expansion, and on the basis of realizing the suppression of the expansion of the solid-state battery cell units, the connecting pieces, structural support members and other components between the plurality of solid-state battery cell units in the restraining member and the space occupied by the components are omitted, thereby effectively reducing the weight of the battery module and improving the energy density and integration of the battery module.

[0048] In one embodiment, Figure 2 As shown, the restraining member 11 is provided with tab extension holes 14 at both ends along the arrangement direction of the plurality of solid-state battery cell units 12 , respectively. The tab extension holes 14 are used to expose the battery tabs 13 of the solid-state battery cell units 12 at both ends of the plurality of solid-state battery cell units 12 .

[0049] In the embodiment of the present application, the restraining member 11 is provided with pole ear extension holes 14 at both ends along the arrangement direction of the plurality of solid-state battery cell units 12. The battery cell pole ears 13 of the solid-state battery cell units 12 located at both ends of the arrangement direction can extend from the pole ear extension holes 14 and be exposed outside the restraining member 11 to serve as electrodes of the battery module 10 so as to facilitate connection between the battery modules 10.

[0050] In one embodiment, an elastic member 15 is filled between the restraining member 11 and the plurality of solid-state battery core units 12 .

[0051] Among them, the elastic part 15 can be a high modulus polymer with high toughness, strength and fatigue resistance, for example, it can be one or more of polyimide, polyethylene terephthalate, poly(p-phenylenediazole), and polyethylene; the elastic part 15 can also be a composite of a high modulus polymer and a thermoplastic elastomer with good thermal conductivity, and the thermoplastic elastomer can be one or more of polyether block amide, styrene thermoplastic rubber, thermoplastic polyurethane, and thermoplastic vulcanized rubber.

[0052] In the embodiment of the present application, the elastic member 15 can be filled in all the spaces in the internal space of the restraint 11 except the space occupied by the multiple solid-state battery cell units 12, that is, the gaps between the restraint 11 and the multiple solid-state battery cell units 12 are completely filled with the elastic member 15. When the solid-state battery cell unit 12 expands, the restraining force provided by the restraint 11 and the elastic force provided by the elastic member 15 act on the solid-state battery cell unit 12 at the same time, which effectively improves the expansion suppression effect of the battery module 10 and ensures the safety of the battery module 10.

[0053] In a possible implementation, an elastic member 15 is filled between the side surface of the solid-state battery cell 12 parallel to the extension surface of the pole tab and the inner wall of the restraining member 11 .

[0054] In the embodiment of the present application, in order to save costs, the elastic member 15 can be filled at the position where the solid-state battery cell unit 12 has a greater expansion degree, for example, the side with the largest area of ​​the solid-state battery cell unit 12 (the side where the length and width are located), that is, the side parallel to the extension surface of the pole ear is filled with the elastic member 15. Specifically, the elastic member 15 can be filled between the entire surface of the side or the central area with the largest expansion degree and the inner wall of the restraining member 11, so as to reduce the cost of the battery module 10 while ensuring the expansion suppression effect.

[0055] In the battery module provided in the embodiment of the present application, an elastic member is filled between the restraining member and a plurality of solid-state battery cell units. When the solid-state battery cell units expand, the restraining force provided by the restraining member and the elastic force provided by the elastic member act on the solid-state battery cell units at the same time, thereby effectively improving the expansion suppression effect of the battery module and ensuring the safety of the battery module.

[0056] In one embodiment, Figure 3 As shown, a battery pack is provided, which includes a plurality of battery modules 10 as described in the above embodiment. The battery module 10 includes a restraining member 11 and a plurality of solid-state battery cells 12 disposed in the restraining member 11, and adjacent solid-state battery cells 12 in the plurality of solid-state battery cells 12 are connected by battery cell tabs 13.

[0057] The embodiment of the present application provides a battery pack, which includes a plurality of battery modules, and the plurality of battery modules include a restraining member and a plurality of solid-state battery cells arranged in the restraining member, wherein adjacent solid-state battery cells in the plurality of solid-state battery cells are connected by battery cell tabs. The embodiment of the present application realizes the series connection between adjacent solid-state battery cells by connecting the battery cell tabs, and uniformly restrains the plurality of solid-state battery cells by a restraining member, that is, a restraining member simultaneously provides restraining force in the side surrounding areas where the plurality of solid-state battery cells are prone to expansion, and on the basis of suppressing the expansion of the solid-state battery cells, eliminates the connection plates, structural support members and other components between the plurality of solid-state battery cells in the restraining member, and the space occupied by the components, effectively reduces the weight of the battery module, improves the energy density and integration level of the battery module, further reduces the weight of the battery pack, and improves the energy density and integration level of the battery pack.

[0058] In one embodiment, considering the blade structure of the battery module 10, in order to form a battery pack with a regular shape and suitable size, multiple battery modules 10 in the battery pack can be arranged in a direction perpendicular to the extension surface of the tab, that is, multiple battery modules 10 in the battery pack are arranged in the thickness direction of the battery module 10.

[0059] In a possible implementation, the battery pack may also be composed of multiple layers (eg, two layers) of battery modules 10 arranged along the thickness direction. The specific arrangement can be determined according to the size of the electrical equipment, and this application does not limit this.

[0060] In the battery pack provided in the embodiment of the present application, multiple battery modules are arranged along the thickness direction (i.e., the shortest side of the battery module), so that the battery pack composed of multiple battery modules has a more regular shape, a more appropriate size relationship between the length, width and height, and a wider range of applications.

[0061] In one embodiment, Figure 4 As shown, the battery pack further includes a bus bar 20 , and the bus bar 20 has a plurality of mounting holes 21 along the arrangement direction of the plurality of battery modules 10 .

[0062] It can be understood that the battery pack includes two bus bars 20 , which are respectively arranged on both sides of the battery module 10 in the length direction.

[0063] The number of mounting holes 21 in the busbar 20 may be the same as the number of battery modules 10 in the battery pack.

[0064] In the embodiment of the present application, the size of the mounting hole 21 can match the size of the battery cell tab 13, and the electrodes of multiple battery modules 10 can be sequentially placed in the mounting holes 21 corresponding to the positions in the bus 21, thereby realizing the connection between the battery module 10 and the bus 20. Furthermore, the parallel connection of multiple battery modules 10 can be realized through the internal structure of the connecting sheet or the bus, that is, the electrical connection inside the battery pack can be realized.

[0065] The battery pack provided in the embodiment of the present application includes a bus bar, which has multiple mounting holes along the arrangement direction of the multiple battery modules. The electrodes of the multiple battery modules in the battery pack can be arranged in the corresponding mounting holes in sequence to achieve connection between the battery modules and the bus bar, and then the parallel connection of the multiple battery modules can be achieved, that is, the internal electrical connection of the battery pack can be achieved.

[0066] In one embodiment, in order to improve the structural stability of the multiple battery modules 10 in the battery pack, as described above Figure 3 As shown, the battery pack further includes a pole 30, which is connected to a pole ear exposed outside the restraining member 11 of the battery module 10. The pole 30 matches the size of the mounting hole 21 of the busbar, and when the pole 30 is disposed in the mounting hole 21 of the busbar, a plurality of battery modules 10 are connected to the busbar 20.

[0067] In the embodiment of the present application, a pole 30 may be provided to be connected to a cell tab 13 extending out of the restraining member 11 of the battery module 10 , so as to enhance the strength of the electrode of the battery module 10 .

[0068] The pole 30 may be connected to the cell tab 13 extending out of the restraining member 11 of the battery module 10 by welding or riveting.

[0069] Among them, the size of the pole 30 matches the size of the mounting hole 21 of the busbar, and when the electrodes of multiple battery modules 10 are sequentially arranged in the mounting holes 21 at corresponding positions in the busbar 21, the battery module 10 is connected to the busbar 20.

[0070] The embodiment of the present application can connect the pole to the pole ear exposed outside the restraining member of the battery module, and enhance the electrode strength of the battery module through the pole. The pole is set in the mounting hole of the busbar to realize the connection between the battery module and the busbar, which improves the stability of the connection between the battery module and the busbar, that is, improves the structural stability of multiple battery modules in the battery pack and improves the reliability of the battery pack.

[0071] In one embodiment, as above Figure 3As shown, the battery pack also includes an upper cover plate 40, a lower base plate 50, a first support plate 60 and a second support plate 70. The upper cover plate 40 and the lower base plate 50 are respectively arranged on both sides of the multiple battery modules 10 along the second direction, the first support plate 60 and the second support plate 70 are respectively arranged on both sides of the multiple battery modules 10 along the third direction, and the upper cover plate 40, the lower base plate 50, the first support plate 60 and the second support plate 70 are respectively fixedly connected to the bus 20.

[0072] In the embodiment of the present application, the battery pack also includes an upper cover plate 40, a lower base plate 50, a first support plate 60 and a second support plate 70. The bus 20, the upper cover plate 40, the lower base plate 50, the first support plate 60 and the second support plate 70 are used to fully encapsulate the multiple battery modules 10, thereby ensuring the structural stability of the battery pack.

[0073] In one embodiment, a surface of the plurality of battery modules 10 close to the lower base plate 50 is coated with a heat conductive layer 80 , or a surface of the lower base plate 50 close to the battery module 10 is coated with a heat conductive layer 80 .

[0074] The heat conducting layer 80 may be heat conducting silicone.

[0075] In the embodiment of the present application, in order to improve the thermal conductivity of the battery pack and ensure the heat dissipation effect of the battery pack, a thermal conductive layer 80 can be coated on the bottom of the battery module 10 (i.e., the side close to the lower base plate 50), and then the battery module 10 is placed on the lower base plate 50; or a thermal conductive layer 80 can be coated on one side of the lower base plate 50 close to the battery module 10, and then the battery module 10 is placed on the lower base plate 50; or a thermal conductive layer 80 can be filled between the battery module 10 and the lower base plate 50.

[0076] In the embodiment of the present application, a thermal conductive layer 80 is coated on one side of the multiple battery modules close to the lower base plate, or a thermal conductive layer is coated on one side of the lower base plate close to the battery module, which can improve the thermal conductivity of the battery pack and ensure the heat dissipation effect of the battery pack.

[0077] In one embodiment, an electric device is provided, the electric device comprising the battery pack as described in the above embodiment.

[0078] The electrical equipment may be a vehicle.

[0079] In the embodiment of the present application, the number of solid-state battery cells 12 connected in series in the battery module 10 and the arrangement and number of the battery modules 10 in the battery pack can be designed according to the size of the vehicle.

[0080] The battery pack includes a plurality of battery modules 10, which are arranged in a direction perpendicular to the extension surface of the tab. The battery module 10 includes a restraining member 11 and a plurality of solid-state battery cells 12 disposed in the restraining member 11, and adjacent solid-state battery cells 12 in the plurality of solid-state battery cells 12 are connected by battery tabs 13.

[0081] In the embodiment of the present application, multiple solid-state battery cells 12 can be connected in series and placed in the internal space of the restraint 11. The restraint 11 can provide restraint force for the multiple solid-state battery cells 12 to suppress the expansion of the multiple solid-state battery cells 12 during use. That is, in the present application, multiple solid-state battery cells 12 are arranged in one restraint 11, so that the battery module 10 forms a blade battery structure, and a restraint 11 provides restraint force for multiple solid-state battery cells 12 at the same time, that is, a restraint 11 provides restraint force at the side surrounding area where multiple solid-state battery cells are prone to expansion. On the basis of suppressing the expansion of multiple solid-state battery cells 12, structural support parts and other components between the solid-state battery cells 12 are omitted, the weight of the battery module 10 is reduced, and the energy density of the battery module 10 is increased. Further, the occupied space of structural support parts and other components between the solid-state battery cells 12 is omitted, and the integration level of the battery module 10 is improved. In addition, the effect of reducing the weight of the battery pack, improving the energy density and integration level of the battery pack can be achieved, thereby achieving the effect of reducing the cost of electrical equipment.

[0082] The restraining member 11 may be an aluminum shell.

[0083] In a possible implementation, adjacent solid-state battery cells 12 in a plurality of solid-state battery cells 12 can be connected in a bipolar stacking manner, for example, by laser welding the pole ears of adjacent solid-state battery cells 12, so that adjacent solid-state battery cells 12 are connected in series, thereby eliminating components such as connecting sheets between a plurality of solid-state battery cells 12 connected in series, reducing the weight of the battery module 10, and improving the energy density of the battery module 10. Furthermore, the space occupied by components such as connecting sheets is eliminated, and the integration level of the battery module 10 is improved. At the same time, the internal resistance of the battery module 10 can be reduced to a certain extent, and the heat generated by the battery module 10 can be reduced. Furthermore, the weight of the battery pack can be reduced, and the energy density and integration level of the battery pack can be improved, thereby reducing the cost of electrical equipment.

[0084] Moreover, the voltage of the battery module 10 composed of multiple solid-state battery cells 12 connected in series is the sum of the voltages of the multiple solid-state battery cells 12, which meets the high-voltage power demand of electrical equipment.

[0085] The embodiment of the present application provides an electrical device, which includes a battery pack, the battery pack includes a plurality of battery modules, the plurality of battery modules include a restraining member and a plurality of solid-state battery cells arranged in the restraining member, and the adjacent solid-state battery cells in the plurality of solid-state battery cells are connected by battery cell tabs. The embodiment of the present application realizes the series connection between adjacent solid-state battery cells through the battery cell tab connection, and uniformly restrains the plurality of solid-state battery cells through a restraining member, that is, a restraining member simultaneously provides restraining force in the side surrounding areas where the plurality of solid-state battery cells are prone to expansion, on the basis of achieving the suppression of the expansion of the solid-state battery cells, the connecting pieces, structural support members and other components between the plurality of solid-state battery cells in the restraining member and the space occupied by the components are omitted, the weight of the battery module is effectively reduced, the energy density and integration level of the battery module are improved, the weight of the battery pack is further reduced, the energy density and integration level of the battery pack are improved, and the cost of the electrical device is reduced.

[0086] In one embodiment, a vehicle is provided, comprising a battery pack as described in the above embodiment, wherein the battery pack is connected to a load of the vehicle to supply power to the vehicle load.

[0087] The battery pack includes a plurality of battery modules 10, which are arranged in a direction perpendicular to the extension surface of the tab. The battery module 10 includes a restraining member 11 and a plurality of solid-state battery cells 12 disposed in the restraining member 11, and adjacent solid-state battery cells 12 in the plurality of solid-state battery cells 12 are connected by battery tabs 13.

[0088] The embodiment of the present application provides a vehicle, the vehicle includes a battery pack, the battery pack includes a plurality of battery modules, the plurality of battery modules include a restraining member and a plurality of solid-state battery cells arranged in the restraining member, and adjacent solid-state battery cells in the plurality of solid-state battery cells are connected by battery cell tabs. The embodiment of the present application realizes the series connection between adjacent solid-state battery cells through the battery cell tab connection, and uniformly restrains the plurality of solid-state battery cells through a restraining member, that is, a restraining member simultaneously provides restraining force in the side surrounding areas where the plurality of solid-state battery cells are prone to expansion, on the basis of realizing the suppression of the expansion of the solid-state battery cells, the connecting pieces, structural support members and other components between the plurality of solid-state battery cells in the restraining member and the space occupied by the components are omitted, the weight of the battery module is effectively reduced, the energy density and integration level of the battery module are improved, the weight of the battery pack is further reduced, the energy density and integration level of the battery pack are improved, and the cost of the vehicle is reduced.

[0089] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A battery module, characterized in that: The battery module includes a restraining member and a plurality of solid-state battery cells arranged in the restraining member, wherein adjacent solid-state battery cells in the plurality of solid-state battery cells are connected via battery cell tabs; The restraining member is provided with tab extension holes at both ends along the arrangement direction of the plurality of solid-state battery cell units, respectively, and the tab extension holes are used to expose the tabs of the solid-state battery cell units at both ends of the plurality of solid-state battery cell units.

2. The battery module according to claim 1, characterized in that: The difference between the length of the restraining member along the first direction and the sum of the lengths of the plurality of solid-state battery cells along the first direction is less than a first preset threshold; the first direction is the arrangement direction of the plurality of solid-state battery cells; and / or, The difference between the length of the restraining member along the second direction and the length of the solid-state battery cell along the second direction is less than a second preset threshold; the second direction is a direction perpendicular to the first direction on the extension surface of the pole ear.

3. The battery module according to claim 1, characterized in that: An elastic member is filled between the restraining member and the plurality of solid-state battery core units.

4. The battery module according to claim 3, characterized in that: An elastic member is filled between the side surface of the solid-state battery cell parallel to the extension surface of the pole ear and the inner wall of the restraining member.

5. A battery pack, characterized in that: The battery pack comprises a plurality of battery modules as described in any one of claims 1-4.

6. The battery pack according to claim 5, characterized in that: The multiple battery modules are arranged along a direction perpendicular to the extension surface of the tabs.

7. The battery pack according to claim 5, characterized in that: The battery pack further includes a bus bar having a plurality of mounting holes along an arrangement direction of the plurality of battery modules.

8. The battery pack according to claim 7, characterized in that: The battery pack further includes a pole connected to a pole ear exposed outside the restraining member of the battery module.

9. The battery pack according to claim 8, characterized in that: The sizes of the pole and the mounting hole of the busbar match, and when the pole is arranged in the mounting hole of the busbar, the multiple battery modules are connected to the busbar.

10. The battery pack according to claim 7, characterized in that: The battery pack also includes an upper cover plate, a lower base plate, a first support plate and a second support plate, the upper cover plate and the lower base plate are respectively arranged on both sides of the multiple battery modules along the second direction, the first support plate and the second support plate are respectively arranged on both sides of the multiple battery modules along the third direction, the upper cover plate, the lower base plate, the first support plate and the second support plate are respectively fixedly connected to the bus bar; the third direction is a direction perpendicular to the extension surface of the pole ear.

11. The battery pack according to claim 10, characterized in that: A heat-conducting layer is coated on one side of the plurality of battery modules close to the lower base plate, or a heat-conducting layer is coated on one side of the lower base plate close to the battery modules.

12. An electrical equipment, characterized in that: The electrical device comprises a battery pack as described in any one of claims 5-11.

13. A vehicle, characterized in that: The vehicle comprises a battery pack as claimed in any one of claims 5 to 11, The battery pack is connected to a load of the vehicle.

Images