Battery module, battery pack and electric device

Abstract

The invention discloses a battery module, a battery pack and a power utilization device, and relates to the technical field of batteries, the battery module comprises a battery unit, and the battery unit comprises a plurality of solid-state battery cell monomers; the battery unit is arranged between the first end plate and the second end plate in the thickness direction of the solid-state battery cell single body, the pressing plate and the elastic mechanism are both arranged between the first end plate and the battery unit, the elastic mechanism is located on the side, facing the first end plate, of the pressing plate, and the first end plate and the second end plate are fixedly connected to clamp the battery unit, the pressing plate and the elastic mechanism; and the elastic mechanism is compressed. The pressing plate and the elastic mechanism are arranged between the first end plate and the battery unit, and the elastic mechanism is compressed and arranged on one side, facing the first end plate, of the pressing plate, so that the pressing plate can continuously apply pressure to the battery unit under the action of the elastic mechanism, and the interface contact state among the plurality of solid-state battery cell monomers can be improved; therefore, the battery module keeps good working performance, and the use reliability of the battery module is improved.

Description

Technical Field

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

[0002] In the related art, the interface contact state between solid-state battery cells will affect the overall performance of the battery module. In addition, the battery module is prone to expansion during the charging and discharging process or after long-term use, which further affects the interface contact state between the solid-state battery cells, resulting in a decrease in the performance of the battery module. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a battery module that improves the interface contact state between multiple solid-state battery cells and maintains good performance of the battery module.

[0004] The present invention further provides a battery pack.

[0005] The present invention further provides an electrical device.

[0006] A battery module according to an embodiment of the present invention includes: a battery unit, the battery unit includes a plurality of solid-state battery cells, the plurality of solid-state battery cells are arranged in sequence along the thickness direction of the solid-state battery cells; a first end plate, a second end plate, a pressure plate and an elastic mechanism, the battery unit is arranged between the first end plate and the second end plate along the thickness direction of the solid-state battery cells, the pressure plate and the elastic mechanism are both arranged between the first end plate and the battery unit, and the elastic mechanism is located on the side of the pressure plate facing the first end plate, the first end plate and the second end plate are fixedly connected to clamp the battery unit, the pressure plate and the elastic mechanism, and the elastic mechanism is compressed.

[0007] According to the battery module of an embodiment of the present invention, by arranging a pressure plate and an elastic mechanism between the first end plate and the battery cell, and the elastic mechanism is compressed and arranged on the side of the pressure plate facing the first end plate, the pressure plate can continuously apply pressure to the battery cell under the action of the elastic mechanism, which is beneficial to improving the interface contact state between multiple solid-state battery cells, thereby enabling the battery module to maintain good working performance and improving the reliability of the battery module.

[0008] In some embodiments of the present invention, the surface of the pressing plate facing the battery cell is a plane.

[0009] In some embodiments of the present invention, the surface area of ​​the pressure plate facing the battery cell is larger than the cross-sectional area of ​​the battery cell, and along the thickness direction of the solid-state battery cell, the orthographic projection of the battery cell is located within the surface of the pressure plate facing the battery cell.

[0010] In some embodiments of the present invention, the elastic mechanism includes a plurality of elastic members, and the plurality of elastic members are disposed at different positions between the first end plate and the pressure plate, and any two adjacent elastic members are spaced apart.

[0011] In some embodiments of the present invention, the first end plate is formed with a first mounting groove open to the pressure plate, there are multiple first mounting grooves, the multiple first mounting grooves correspond one-to-one to the multiple elastic members, and the ends of the elastic members facing away from the pressure plate are installed in the corresponding first mounting grooves.

[0012] In some embodiments of the present invention, the pressure plate is formed with a second mounting groove open to the first end plate, there are multiple second mounting grooves, the multiple second mounting grooves correspond one-to-one to the multiple elastic members, and the ends of the elastic members facing away from the first end plate are installed in the corresponding second mounting grooves.

[0013] In some embodiments of the present invention, the battery module further includes: an insulating plate, an insulating plate is provided between the second end plate and the battery cell, and an insulating plate is provided between the pressing plate and the battery cell.

[0014] In some embodiments of the present invention, along the thickness direction of the solid-state battery cell, two opposite surfaces of the insulating plate are both planes.

[0015] In some embodiments of the present invention, the surface area of ​​the insulating plate facing the battery cell is larger than the cross-sectional area of ​​the battery cell, and along the thickness direction of the solid-state battery cell, the orthographic projection of the battery cell is located within the surface of the insulating plate facing the battery cell.

[0016] In some embodiments of the present invention, the battery module further includes: a plurality of fasteners, which are connected to both the first end plate and the second end plate to fix the first end plate and the second end plate, and the plurality of fasteners are arranged around the battery cell along the circumference of the battery cell.

[0017] In some embodiments of the present invention, the fastener includes a rod and a head, the head is fixed to the first end of the rod, a threaded portion is formed on the peripheral wall of the rod, the threaded portion and the second end of the rod are adjacent, the first end plate is formed with a plurality of threaded holes, the second end plate is formed with a plurality of through holes, the plurality of threaded holes and the plurality of through holes are arranged in one-to-one correspondence, the rod is passed through the corresponding through holes and assembled in the corresponding threaded holes, and the head is located on the side of the second end plate away from the first end plate and abuts against the second end plate.

[0018] In some embodiments of the present invention, the battery module also includes: a strap, which is a metal part, a third mounting groove is formed on the surface of the first end plate facing away from the second end plate, and a fourth mounting groove is formed on the surface of the second end plate facing away from the first end plate, the third mounting groove and the fourth mounting groove are opposite to each other along the thickness direction of the solid-state battery cell, and the extension direction of the third mounting groove and the fourth mounting groove is the same, the strap is arranged around the first end plate, the second end plate and the battery unit, and the two ends of the strap are fixedly connected, and at least a portion of the strap is assembled in the third mounting groove and the fourth mounting groove.

[0019] In some embodiments of the present invention, there are multiple straps, multiple third mounting slots, and multiple fourth mounting slots, and the multiple straps, multiple third mounting slots, and multiple fourth mounting slots correspond to each other one by one.

[0020] A battery pack according to an embodiment of the present invention includes the battery module of the above embodiment.

[0021] An electric device according to an embodiment of the present invention includes the battery pack of the above embodiment.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0024] Figure 1 is an exploded schematic diagram of a battery module according to an embodiment of the present invention;

[0025] Figure 2 is a schematic diagram of a battery module according to an embodiment of the present invention.

[0026] Reference numerals:

[0027] Battery module 100;

[0028] Battery unit 10; solid-state battery cell 11;

[0029] First end plate 20; first mounting groove 21; threaded hole 22; third mounting groove 23;

[0030] Second end plate 30; through hole 32; fourth mounting groove 33;

[0031] Pressing plate 40;

[0032] Elastic mechanism 50; elastic member 51;

[0033] Insulation plate 60;

[0034] Fastener 70; rod 71; threaded portion 711; first end 712; second end 713; head 72;

[0035] - Strap-80. DETAILED DESCRIPTION

[0036] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0037] Reference below Figure 1-Figure 2 A battery module 100 according to an embodiment of the present invention is described.

[0038] like Figure 1 As shown, a battery module 100 according to an embodiment of the present invention includes: a battery cell 10, the battery cell 10 includes a plurality of solid-state battery cells 11, and the plurality of solid-state battery cells 11 are arranged in sequence along the thickness direction of the solid-state battery cells 11; a first end plate 20, a second end plate 30, a pressing plate 40 and an elastic mechanism 50, along the thickness direction of the solid-state battery cells 11, the battery cell 10 is arranged between the first end plate 20 and the second end plate 30, the pressing plate 40 and the elastic mechanism 50 are both arranged between the first end plate 20 and the battery cell 10, and the elastic mechanism 50 is located on the side of the pressing plate 40 facing the first end plate 20, the first end plate 20 and the second end plate 30 are fixedly connected to clamp the battery cell 10, the pressing plate 40 and the elastic mechanism 50, and the elastic mechanism 50 is compressed.

[0039] Among them, a plurality of solid-state battery cells 11 can be provided, for example: the solid-state battery cell 11 can be provided with two, three, four or more but not limited to, a plurality of solid-state battery cells 11 can supply power to electrical equipment, a plurality of solid-state battery cells 11 can increase the capacity of the battery unit 10, and a plurality of solid-state battery cells 11 along Figure 1 The X direction shown is arranged in sequence, Figure 1 The X direction shown is the thickness direction of the solid battery cell 11 .

[0040] Along the thickness direction of the solid-state battery cell 11, the battery unit 10 is arranged between the first end plate 20 and the second end plate 30, that is, the first end plate 20 and the second end plate 30 are respectively arranged on both sides of the battery unit 10, and a pressure plate 40 and an elastic mechanism 50 are arranged between the first end plate 20 and the battery unit 10, and the elastic mechanism 50 is located between the pressure plate 40 and the first end plate 20. That is to say, along the thickness direction of the solid-state battery cell 11, the first end plate 20, the elastic mechanism 50, the pressure plate 40, the battery unit 10, and the second end plate 30 are arranged in sequence.

[0041] The first end plate 20 and the second end plate 30 are fixedly connected, for example, the first end plate 20 and the second end plate 30 are fixedly connected by a fastener 70, wherein the fastener 70 may be a bolt, a screw, etc., or the first end plate 20 and the second end plate 30 are fixedly connected by a binding band 80. In this way, the elastic mechanism 50 can be compressed between the first end plate 20 and the pressing plate 40, so that the pressing plate 40 can continuously apply pressure to the battery unit 10 under the action of the elastic mechanism 50, which is conducive to improving the interface contact state between the multiple solid-state battery cells 11.

[0042] Specifically, since the first end plate 20, the elastic mechanism 50, the pressure plate 40, the battery cell 10, and the second end plate 30 are arranged in sequence, by fixedly connecting the first end plate 20 and the second end plate 30, the first end plate 20 and the second end plate 30 can clamp the battery cell 10, the pressure plate 40, and the elastic mechanism 50, and the elastic mechanism 50 can be compressed between the first end plate 20 and the pressure plate 40, so that the elastic mechanism 50 applies pressure toward the pressure plate 40, so as to continuously apply pressure to the battery cell 10 through the pressure plate 40, which can improve the interface contact state between multiple solid-state battery cells 11, and the pressure of the elastic mechanism 50 is transmitted through the pressure plate 40, which can improve the uniformity of the surface pressure, which is beneficial for the battery module 100 to maintain good charging and discharging performance, and to meet the expansion requirements of the battery module 100 during the entire life cycle, and can also improve the recovery rate of the solid-state battery cell 11 when it contracts after expansion.

[0043] Therefore, by arranging the pressure plate 40 and the elastic mechanism 50 between the first end plate 20 and the battery cell 10, and the elastic mechanism 50 being compressed and arranged on the side of the pressure plate 40 facing the first end plate 20, the pressure plate 40 can continuously apply pressure to the battery cell 10 under the action of the elastic mechanism 50, which is beneficial to improve the interface contact state between the multiple solid-state battery cells 11, thereby enabling the battery module 100 to maintain good working performance and improve the reliability of the battery module 100.

[0044] In some embodiments of the present invention, Figure 1 As shown, the surface of the pressing plate 40 facing the battery cell 10 is a plane.

[0045] The pressing plate 40 may be constructed as a plate-like structure, the surface of the pressing plate 40 facing the battery cell 10 is the surface of the pressing plate 40 away from the first end plate 20, the surface of the pressing plate 40 facing the battery cell 10 is a plane, and the surface of the pressing plate 40 facing the battery cell 10 may be perpendicular to the thickness direction of the solid-state battery cell 11. By making the surface of the pressing plate 40 facing the battery cell 10 a plane, the pressure continuously applied by the elastic mechanism 50 to the pressing plate 40 can be uniformly applied to the battery cell 10, which is conducive to improving the uniformity of the surface pressure, thereby improving the interface contact state between the multiple solid-state battery cells 11, and is conducive to the battery module 100 maintaining good charge and discharge performance.

[0046] In some embodiments of the present invention, Figure 1 As shown, the surface area of ​​the pressing plate 40 facing the battery cell 10 is larger than the cross-sectional area of ​​the battery cell 10 , and along the thickness direction of the solid battery cell 11 , the orthographic projection of the battery cell 10 is located within the surface of the pressing plate 40 facing the battery cell 10 .

[0047] Among them, the cross-section of the battery cell 10 along the plane perpendicular to the thickness direction of the solid-state battery cell 11 is the cross-section of the battery cell 10, the cross-sectional area of ​​the battery cell 10 is smaller than the surface area of ​​the pressing plate 40 facing the battery cell 10, and, along the thickness direction of the solid-state battery cell 11, the orthographic projection of the battery cell 10 is located within the surface of the pressing plate 40 facing the battery cell 10, that is, the orthographic projection of the surface of the pressing plate 40 facing the battery cell 10 covers the orthographic projection of the battery cell 10.

[0048] Such an arrangement can make the setting position of the pressure plate 40 reasonable, and can make the surface area of ​​the pressure plate 40 facing the battery cell 10 reasonably arranged, so that the side of the battery cell 10 facing the pressure plate 40 can evenly bear the pressure transmitted by the pressure plate 40, which is beneficial to make the force uniform at various places on the side of the battery cell 10 facing the pressure plate 40, and is beneficial to improve the uniformity of surface pressure, thereby enabling the battery module 100 to maintain good working performance and improve the reliability of the battery module 100.

[0049] In some embodiments of the present invention, Figure 1 As shown, the elastic mechanism 50 includes a plurality of elastic members 51 , and the plurality of elastic members 51 are disposed at different positions between the first end plate 20 and the pressure plate 40 , and any two adjacent elastic members 51 are spaced apart.

[0050] There may be multiple elastic members 51, for example, there may be, but are not limited to, two, three, four or more elastic members 51, and the multiple elastic members 51 are all disposed between the first end plate 20 and the pressure plate 40 and at different positions, and any two adjacent elastic members 51 are spaced apart from each other among the multiple elastic members 51. The elastic member 51 may be configured as a component capable of generating elastic deformation, such as a spring, rubber, etc. This application is illustrated by taking the elastic member 51 as a spring as an example.

[0051] As some embodiments of the present application, the plurality of elastic members 51 may be arranged evenly spaced apart in a straight line direction. As some embodiments of the present application, the plurality of elastic members 51 may be arranged in the same circumferential direction.

[0052] By arranging the plurality of elastic members 51 at different positions between the first end plate 20 and the pressure plate 40, and spacing any two adjacent elastic members 51, the arrangement of the plurality of elastic members 51 can be reasonable, which is beneficial for applying pressure to various locations of the pressure plate 40 through the plurality of elastic members 51, so that the various locations of the pressure plate 40 are subjected to uniform force, thereby enabling the various locations of the battery unit 10 facing the pressure plate 40 to be subjected to uniform force, which is beneficial for improving the uniformity of surface pressure and improving the interface contact state between the plurality of solid-state battery cell monomers 11.

[0053] In some embodiments of the present invention, Figure 1 As shown, the first end plate 20 is formed with a first mounting groove 21 open to the pressure plate 40. There are multiple first mounting grooves 21, and the multiple first mounting grooves 21 correspond to multiple elastic members 51 one by one. The end of the elastic member 51 facing away from the pressure plate 40 is installed in the corresponding first mounting groove 21.

[0054] Among them, the first end plate 20 is formed with a first mounting groove 21, and the first mounting groove 21 is open and arranged toward the pressure plate 40. There are multiple first mounting grooves 21, for example: the first mounting grooves 21 can be but not limited to being provided with two, three, four or more, and the number of first mounting grooves 21 is the same as the number of elastic members 51. Multiple first mounting grooves 21 and multiple elastic members 51 are arranged in a one-to-one correspondence. Along the thickness direction of the solid-state battery cell 11, the elastic member 51 has two opposite end portions, one of which is away from the pressure plate 40, and the end of the elastic member 51 away from the pressure plate 40 is installed in the corresponding first mounting groove 21.

[0055] By installing the end of the elastic member 51 away from the pressure plate 40 in the corresponding first installation groove 21, it is convenient to set the elastic member 51 between the pressure plate 40 and the first end plate 20, which is beneficial to reduce the assembly difficulty of the battery module 100 and improve the assembly efficiency of the battery module 100. In addition, the first installation groove 21 can guide the elastic member 51 so that the elastic member 51 can be accurately compressed and stretched along the axial direction of the elastic member 51 to reduce the risk of deflection of the elastic member 51 during the compression and stretching process. In addition, it can also reduce the risk of movement of the elastic member 51 during the assembly process and the working process, which is beneficial to improve the reliability of the battery module 100.

[0056] In some embodiments of the present invention, the pressure plate 40 is formed with a second mounting groove open to the first end plate 20, and there are multiple second mounting grooves, and the multiple second mounting grooves correspond one-to-one to the multiple elastic members 51, and the ends of the elastic members 51 facing away from the first end plate 20 are installed in the corresponding second mounting grooves.

[0057] Among them, the pressing plate 40 is formed with a second mounting groove, and the second mounting groove is open toward the first end plate 20. There are multiple second mounting grooves, for example: the second mounting groove can be but not limited to being provided with two, three, four or more, and the number of second mounting grooves is the same as the number of elastic members 51, and multiple second mounting grooves and multiple elastic members 51 are arranged in a one-to-one correspondence. Specifically, the number of second mounting grooves, the number of elastic members 51, and the number of first mounting grooves 21 are the same, and multiple second mounting grooves, multiple elastic members 51, and multiple first mounting grooves 21 are arranged in a one-to-one correspondence. Along the thickness direction of the solid-state battery cell 11, the elastic member 51 has two opposite end portions, one of which is away from the first end plate 20, and the end of the elastic member 51 away from the first end plate 20 is installed in the corresponding second mounting groove.

[0058] By installing the end of the elastic member 51 away from the first end plate 20 in the corresponding second installation groove, the elastic member 51 can be easily arranged between the pressure plate 40 and the first end plate 20, which is beneficial to reduce the difficulty of assembling the battery module 100 and improve the assembly efficiency of the battery module 100. In addition, the second installation groove can guide the elastic member 51 so that the elastic member 51 can be accurately compressed and stretched along the axial direction of the elastic member 51 to reduce the risk of deflection of the elastic member 51 during compression and stretching. In addition, it can also reduce the risk of movement of the elastic member 51 during assembly and operation, which is beneficial to improve the reliability of the battery module 100.

[0059] In addition, by installing the two opposite ends of the elastic member 51 in the corresponding second installation groove and the corresponding first installation groove 21 respectively, the risk of movement of the elastic member 51 during assembly and operation can be further reduced, which is beneficial to further improve the reliability of the battery module 100.

[0060] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the battery module 100 further includes: an insulating plate 60 , an insulating plate 60 is disposed between the second end plate 30 and the battery cell 10 , and an insulating plate 60 is disposed between the pressing plate 40 and the battery cell 10 .

[0061] The insulating plate 60 is made of insulating material, for example, the insulating plate 60 may be made of, but not limited to, ceramic, plastic, etc. There are multiple insulating plates 60, for example, the insulating plates 60 may be, but not limited to, two, three, four or more, and insulating plates 60 are provided between the second end plate 30 and the battery cell 10, and between the pressing plate 40 and the battery cell 10. This article takes the number of two insulating plates 60 as an example for description, an insulating plate 60 is provided between the second end plate 30 and the battery cell 10, an insulating plate 60 is provided between the pressing plate 40 and the battery cell 10, and the insulating plate 60 is in contact with the battery cell 10.

[0062] By setting an insulating plate 60 between the second end plate 30 and the battery cell 10, the risk of short circuit between the second end plate 30 and the battery cell 10 can be reduced. By setting an insulating plate 60 between the pressure plate 40 and the battery cell 10, the risk of short circuit between the first end plate 20 and the battery cell 10 can be reduced, which is beneficial to improving the working reliability and safety of the battery module 100, and is beneficial to extending the service life of the battery module 100.

[0063] In some embodiments of the present invention, Figure 1 As shown, along the thickness direction of the solid-state battery cell 11 , two opposite surfaces of the insulating plate 60 are both planes.

[0064] The insulating plate 60 can be constructed as a plate-like structure, along the thickness direction of the solid-state battery cell 11, that is, Figure 1 In the X direction shown, the insulating plate 60 has two opposite surfaces. Specifically, the insulating plate 60 arranged between the second end plate 30 and the battery cell 10 has two opposite surfaces, one of which faces the second end plate 30 and the other faces the battery cell 10. The insulating plate 60 arranged between the pressing plate 40 and the battery cell 10 has two opposite surfaces, one of which faces the pressing plate 40 and the other faces the battery cell 10.

[0065] Along the thickness direction of the solid-state battery cell 11 , the two opposite surfaces of the insulating plate 60 are both planes, and the two opposite surfaces of the insulating plate 60 may be perpendicular to the thickness direction of the solid-state battery cell 11 .

[0066] By making the two relative surfaces of the insulating plate 60 both flat, the contact area between the insulating plate 60 and the battery cell 10 can be large, and the force transmission between the insulating plate 60 and the battery cell 10 can be uniform, which is beneficial to improving the uniformity of surface pressure. In addition, the insulating plate 60 between the pressure plate 40 and the battery cell 10 can evenly apply the pressure continuously applied to the pressure plate 40 by the elastic mechanism 50 to the battery cell 10, which can improve the interface contact state between multiple solid-state battery cells 11, which is beneficial for the battery module 100 to maintain good charging and discharging performance.

[0067] In some embodiments of the present invention, Figure 1 As shown, the surface area of ​​the insulating plate 60 facing the battery cell 10 is larger than the cross-sectional area of ​​the battery cell 10 , and along the thickness direction of the solid battery cell 11 , the orthographic projection of the battery cell 10 is located within the surface of the insulating plate 60 facing the battery cell 10 .

[0068] Among them, the cross-section of the battery cell 10 along the plane perpendicular to the thickness direction of the solid-state battery cell 11 is the cross-section of the battery cell 10, the cross-sectional area of ​​the battery cell 10 is smaller than the surface area of ​​the insulating plate 60 facing the battery cell 10, and, along the thickness direction of the solid-state battery cell 11, the orthographic projection of the battery cell 10 is located within the surface of the insulating plate 60 facing the battery cell 10, that is, the orthographic projection of the surface of the insulating plate 60 facing the battery cell 10 covers the orthographic projection of the battery cell 10.

[0069] Such an arrangement can make the arrangement position of the insulating plate 60 reasonable, and can make the surface area of ​​the insulating plate 60 facing the battery cell 10 arranged reasonably, and can make the surface area of ​​the insulating plate 60 facing the battery cell 10 larger than the cross-sectional area of ​​the battery cell 10, which can reduce the risk of short circuit between the second end plate 30 and the battery cell 10, and can reduce the risk of short circuit between the first end plate 20 and the battery cell 10, which is beneficial to improving the working reliability and use safety of the battery module 100, and can make the side of the battery cell 10 facing the pressure plate 40 evenly bear the pressure transmitted by the pressure plate 40, which is beneficial to make the force at various places on the side of the battery cell 10 facing the pressure plate 40 uniform, and is beneficial to improving the uniformity of surface pressure, so that the battery module 100 maintains good working performance and improves the use reliability of the battery module 100.

[0070] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the battery module 100 further includes: a plurality of fasteners 70 , which are connected to both the first end plate 20 and the second end plate 30 to fix the first end plate 20 and the second end plate 30 , and the plurality of fasteners 70 are arranged around the battery cell 10 along the circumference of the battery cell 10 .

[0071] The fastener 70 may be a bolt, a screw, etc., and the fastener 70 is configured as a bolt as an example for illustration herein. The fastener 70 is connected to both the first end plate 20 and the second end plate 30 to fix the first end plate 20 and the second end plate 30. A plurality of fasteners 70 may be provided, for example, the fastener 70 may be provided with two, three, four or more fasteners, but not limited to, and the plurality of fasteners 70 are provided around the battery cell 10 along the circumference of the battery cell 10.

[0072] By fixing the first end plate 20 and the second end plate 30 with the fastener 70, the first end plate 20 and the second end plate 30 can be firmly fixed, and the probability of separation of the first end plate 20 and the second end plate 30 can be reduced. By arranging a plurality of fasteners 70 around the battery cell 10 along the circumference of the battery cell 10, the first end plate 20 and the second end plate 30 can be more firmly fixed, and the force at various locations of the first end plate 20 and the second end plate 30 can be uniform, so that the force on both sides of the battery cell 10 along the thickness direction of the solid-state battery cell 11 can be uniform, which is beneficial to improving the uniformity of surface pressure and improving the interface contact state between multiple solid-state battery cell monomers 11.

[0073] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the fastener 70 includes a rod 71 and a head 72, the first end 712 of the rod 71 is fixed with the head 72, the peripheral wall of the rod 71 is formed with a threaded portion 711, the threaded portion 711 and the second end 713 of the rod 71 are adjacent, the first end plate 20 is formed with a plurality of threaded holes 22, the second end plate 30 is formed with a plurality of through holes 32, the plurality of threaded holes 22 and the plurality of through holes 32 are arranged one by one, the rod 71 is penetrated through the corresponding through holes 32 and assembled in the corresponding threaded holes 22, the head 72 is located on the side of the second end plate 30 away from the first end plate 20 and abuts against the second end plate 30.

[0074] Among them, along the extension direction of the rod 71, the rod 71 has a first end 712 and a second end 713 opposite to each other, and the first end 712 of the rod 71 is fixed with a head 72. As some embodiments of the present application, the rod 71 and the head 72 are integrally formed to reduce the difficulty of producing the fastener 70. The peripheral wall of the rod 71 is formed with a threaded portion 711, and the threaded portion 711 can be an external thread. The threaded portion 711 and the second end 713 of the rod 71 are adjacent, that is, the threaded portion 711 is adjacent to an end of the rod 71 away from the head 72, and the first end plate 20 is formed with a plurality of threaded holes 22, and the threaded holes 22 have internal threads, and the internal threads can The second end plate 30 is capable of cooperating with the external thread, and a plurality of through holes 32 are formed thereon. The plurality of threaded holes 22 and the plurality of through holes 32 are arranged in one-to-one correspondence. Specifically, the plurality of threaded holes 22, the plurality of through holes 32, and the plurality of fasteners 70 are arranged in one-to-one correspondence. The rod portion 71 is passed through the corresponding through hole 32, and the threaded portion 711 of the peripheral wall of the rod portion 71 is threadedly engaged with the corresponding threaded hole 22. The head portion 72 is located on the side of the second end plate 30 that is away from the first end plate 20. When the threaded portion 711 of the peripheral wall of the rod portion 71 is threadedly engaged with the corresponding threaded hole 22, the head portion 72 can be screwed so as to make the head portion 72 abut against the side of the second end plate 30 that is away from the first end plate 20.

[0075] Such an arrangement can make the structural form of the fastener 70 reasonable, and the first end plate 20 and the second end plate 30 can be fixedly connected by the fastener 70. In addition, the fastener 70 can be threadedly matched with the first end plate 20, and the head 72 of the fastener 70 can be abutted against the side of the second end plate 30 away from the first end plate 20, so as to reduce the risk of loosening of the fastener 70 and improve the firmness of the installation.

[0076] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the battery module 100 also includes: a strap 80, which is a metal part. A third mounting groove 23 is formed on the surface of the first end plate 20 facing away from the second end plate 30, and a fourth mounting groove 33 is formed on the surface of the second end plate 30 facing away from the first end plate 20. The third mounting groove 23 and the fourth mounting groove 33 are opposite to each other along the thickness direction of the solid-state battery cell 11, and the extension direction of the third mounting groove 23 and the fourth mounting groove 33 is the same. The strap 80 is arranged around the first end plate 20, the second end plate 30 and the battery unit 10, and the two ends of the strap 80 are fixedly connected, and at least a portion of the strap 80 is assembled in the third mounting groove 23 and the fourth mounting groove 33.

[0077] Among them, along the thickness direction of the solid-state battery cell 11, that is, Figure 1In the X direction shown, a third mounting groove 23 is formed on the surface of the first end plate 20 away from the second end plate 30, and the third mounting groove 23 is open in the direction away from the second end plate 30. A fourth mounting groove 33 is formed on the surface of the second end plate 30 away from the first end plate 20, and the fourth mounting groove 33 is open in the direction away from the first end plate 20. Along the thickness direction of the solid-state battery cell 11, the third mounting groove 23 and the fourth mounting groove 33 are opposite and spaced apart.

[0078] The third mounting groove 23 and the fourth mounting groove 33 extend in the same direction. For example, the third mounting groove 23 and the fourth mounting groove 33 can both extend along the second direction. Figure 1 The Y direction is shown, and the Y direction is perpendicular to the X direction. The band 80 is arranged around the first end plate 20, the second end plate 30 and the battery cell 10, and the two ends of the band 80 are fixedly connected to fix and assemble the first end plate 20, the second end plate 30 and the battery cell 10 through the band 80. The two ends of the band 80 can be welded, or both ends of the band 80 can be welded to the first end plate 20 or the second end plate 30.

[0079] At least part of the strap 80 is assembled in the third mounting groove 23 and the fourth mounting groove 33, for example, part of the structure of the strap 80 is located in the third mounting groove 23, and another part of the structure of the strap 80 is located in the fourth mounting groove 33, or part of the structure of the strap 80 is located in the third mounting groove 23, part of the structure of the strap 80 is located in the fourth mounting groove 33, and part of the structure of the strap 80 is located outside the third mounting groove 23 and the fourth mounting groove 33. The strap 80 is a metal part, for example, the material of the strap 80 can be but not limited to copper, iron, aluminum alloy, etc. The strap 80 is a metal part, which can improve the structural strength of the strap 80, and can facilitate welding of the strap 80, and can also facilitate welding of the strap 80 to the first end plate 20 or the second end plate 30.

[0080] By providing a strap 80 around the first end plate 20, the second end plate 30 and the battery cell 10, the first end plate 20, the second end plate 30 and the battery cell 10 can be fixedly assembled to improve the assembly firmness of the battery module 100, and by assembling at least part of the strap 80 in the third mounting groove 23 and the fourth mounting groove 33, the risk of movement of the strap 80 can be reduced to further improve the assembly firmness of the battery module 100.

[0081] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, there are multiple straps 80, multiple third mounting slots 23 and multiple fourth mounting slots 33, and the multiple straps 80, multiple third mounting slots 23 and multiple fourth mounting slots 33 correspond to each other one by one.

[0082] For example, the number of the strap 80, the third mounting slot 23 and the fourth mounting slot 33 may be, but is not limited to, two, three, four or more, and the plurality of straps 80, the plurality of third mounting slots 23 and the plurality of fourth mounting slots 33 are arranged one by one, the plurality of straps 80 are arranged around the first end plate 20, the second end plate 30 and the battery unit 10, and at least part of the structure of each strap 80 is assembled in the corresponding third mounting slot 23 and the corresponding fourth mounting slot 33. The plurality of straps 80 may be arranged evenly spaced.

[0083] By increasing the number of binding straps 80 , the assembly firmness of the battery module 100 can be further improved, and the force uniformity of the first end plate 20 and the second end plate 30 can be improved, so that the force on both sides of the battery unit 10 can be uniform, which is beneficial to improving the interface contact state between the multiple solid-state battery cells 11.

[0084] The battery module 100 of the present application can provide a pressure of more than 10 MPa to the battery cell 10, and the battery module 100 of the present application is light in weight, highly versatile, and suitable for large-scale production and use.

[0085] As some embodiments of the present application, when assembling the battery module 100 of the present application, the strap 80 can be first assembled with the first end plate 20, and then the elastic mechanism 50, the pressure plate 40, the part of the insulating plate 60, the battery cell 10, the other part of the insulating plate 60, and the second end plate 30 are placed in predetermined positions in sequence, and then pressure is applied to the second end plate 30, and then the strap 80 is assembled with the second end plate 30, and then the pressure applied to the second end plate 30 is released.

[0086] Applying pressure to the second end plate 30 may include: pre-calculating the elastic modulus of the battery cell 10, and then calculating the compression distance according to the target pressure, and only pressing to the specified position during installation. Alternatively, applying pressure to the second end plate 30 may include: placing a pressure sensor between the second end plate 30 and the insulating plate 60 adjacent to the second end plate 30 to measure the pressure through the pressure sensor, and when the pressure reaches the required pressure, maintaining the pressure unchanged, and then assembling the second end plate 30 and the first end plate 20 through the fastener 70.

[0087] As some embodiments of the present application, the pressure sensor may also be placed between the pressing plate 40 and the insulating plate 60 adjacent to the pressing plate 40 , or the pressure sensor may also be placed between the pressing plate 40 and the first end plate 20 .

[0088] The battery pack according to the embodiment of the present invention includes the battery module 100 of the above embodiment. By arranging the pressing plate 40 and the elastic mechanism 50 between the first end plate 20 and the battery cell 10, and the elastic mechanism 50 being compressed and arranged on the side of the pressing plate 40 facing the first end plate 20, the pressing plate 40 can continuously apply pressure to the battery cell 10 under the action of the elastic mechanism 50, which is conducive to improving the interface contact state between the multiple solid-state battery cells 11, so that the battery module 100 maintains good working performance, thereby improving the reliability of the battery pack.

[0089] The electric device according to the embodiment of the present invention includes the battery pack of the above embodiment. By arranging the pressing plate 40 and the elastic mechanism 50 between the first end plate 20 and the battery cell 10, and the elastic mechanism 50 is compressed and arranged on the side of the pressing plate 40 facing the first end plate 20, the pressing plate 40 can continuously apply pressure to the battery cell 10 under the action of the elastic mechanism 50, which is conducive to improving the interface contact state between the multiple solid-state battery cells 11, so that the battery module 100 maintains good working performance, thereby improving the reliability of the battery pack, facilitating the stable power supply of the battery pack to the electric device, and further improving the reliability of the electric device.

[0090] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0091] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery module, characterized in that: include: A battery unit, wherein the battery unit comprises a plurality of solid-state battery cells, and the plurality of solid-state battery cells are arranged in sequence along a thickness direction of the solid-state battery cell; A first end plate, a second end plate, a pressure plate and an elastic mechanism, along the thickness direction of the solid-state battery cell, the battery cell is arranged between the first end plate and the second end plate, the pressure plate and the elastic mechanism are both arranged between the first end plate and the battery cell, and the elastic mechanism is located on the side of the pressure plate facing the first end plate, the first end plate and the second end plate are fixedly connected to clamp the battery cell, the pressure plate and the elastic mechanism, and the elastic mechanism is compressed.

2. The battery module according to claim 1, characterized in that: The surface of the pressing plate facing the battery unit is a plane.

3. The battery module according to claim 2, characterized in that: The surface area of ​​the pressing plate facing the battery cell is larger than the cross-sectional area of ​​the battery cell, and along the thickness direction of the solid-state battery cell, the orthographic projection of the battery cell is located within the surface of the pressing plate facing the battery cell.

4. The battery module according to claim 1, characterized in that: The elastic mechanism includes a plurality of elastic members, and the plurality of elastic members are arranged at different positions between the first end plate and the pressure plate, and any two adjacent elastic members are spaced apart.

5. The battery module according to claim 4, characterized in that: The first end plate is formed with a first mounting groove open to the pressure plate, there are multiple first mounting grooves, the multiple first mounting grooves correspond to the multiple elastic members one by one, and the ends of the elastic members facing away from the pressure plate are installed in the corresponding first mounting grooves.

6. The battery module according to claim 5, characterized in that: The pressure plate is formed with a second mounting groove open to the first end plate, there are multiple second mounting grooves, the multiple second mounting grooves correspond to the multiple elastic members one by one, and the ends of the elastic members facing away from the first end plate are installed in the corresponding second mounting grooves.

7. The battery module according to claim 1, characterized in that: Also includes: An insulating plate is provided between the second end plate and the battery cell, and between the pressing plate and the battery cell.

8. The battery module according to claim 7, characterized in that: Along the thickness direction of the solid-state battery cell, two opposite surfaces of the insulating plate are both planes.

9. The battery module according to claim 7, characterized in that: The surface area of ​​the insulating plate facing the battery cell is larger than the cross-sectional area of ​​the battery cell, and along the thickness direction of the solid-state battery cell, the orthographic projection of the battery cell is located within the surface of the insulating plate facing the battery cell.

10. The battery module according to any one of claims 1 to 9, characterized in that: Also includes: A plurality of fasteners are connected to the first end plate and the second end plate to fix the first end plate and the second end plate, and the plurality of fasteners are arranged around the battery cell along the circumference of the battery cell.

11. The battery module according to claim 10, characterized in that: The fastener includes a rod and a head, the head is fixedly provided at the first end of the rod, a threaded portion is formed on the peripheral wall of the rod, the threaded portion is adjacent to the second end of the rod, the first end plate is formed with a plurality of threaded holes, the second end plate is formed with a plurality of through holes, the plurality of threaded holes and the plurality of through holes are arranged in one-to-one correspondence, the rod is passed through the corresponding through holes and assembled in the corresponding threaded holes, and the head is located on the side of the second end plate away from the first end plate and abuts against the second end plate.

12. The battery module according to any one of claims 1 to 9, characterized in that: Also includes: A strap, wherein the strap is a metal part, a third mounting groove is formed on the surface of the first end plate facing away from the second end plate, a fourth mounting groove is formed on the surface of the second end plate facing away from the first end plate, the third mounting groove and the fourth mounting groove are opposite to each other along the thickness direction of the solid-state battery cell, and the extension direction of the third mounting groove and the fourth mounting groove is the same, the strap is arranged around the first end plate, the second end plate and the battery unit, and the two ends of the strap are fixedly connected, and at least a portion of the strap is assembled in the third mounting groove and the fourth mounting groove.

13. The battery module according to claim 12, characterized in that: There are multiple straps, multiple third mounting slots and multiple fourth mounting slots, and the multiple straps, multiple third mounting slots and multiple fourth mounting slots correspond to each other one by one.

14. A battery pack, characterized in that: Comprising a battery module according to any one of claims 1-13.

15. An electrical device, characterized in that: Comprising the battery pack according to claim 14.

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