Solid-state battery pack and vehicle

Abstract

The invention discloses a solid-state battery pack and a vehicle, and relates to the technical field of batteries. The solid-state battery pack comprises a lower bottom plate, an upper cover plate, a battery cell assembly and a connecting bolt; the lower bottom plate is provided with a first threaded hole; the upper cover plate is provided with a second threaded hole, and the second threaded hole is opposite to the first threaded hole; the battery core assembly is positioned between the lower bottom plate and the upper cover plate; the connecting bolt is provided with a first threaded area and a second threaded area which are opposite in direction, the first threaded area is connected with the first threaded hole, and the second threaded area is connected with the second threaded hole. According to the battery cell assembly disclosed by the invention, the lower bottom plate and the upper cover body are in threaded connection by adopting the connecting bolt, and in the use process of the battery cell assembly, the volume and the connecting stress between the lower bottom plate and the upper cover body can be adjusted by adjusting the connecting position of the lower bottom plate and the connecting bolt and the connecting position of the upper cover body and the connecting bolt; therefore, excessive stress applied to the lower bottom plate and / or the upper cover body by the expanded battery core assembly is avoided, and the unpacking difficulty of the solid-state battery pack is reduced.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of batteries, and in particular to a solid-state battery pack and a vehicle. BACKGROUND

[0002] With the development of new energy technology, solid-state battery cells have advantages of high energy density, high safety, long cycle life, etc., and the soft-pack battery cell packaging form has advantages of light weight, flexible design, etc., therefore, the soft-pack solid-state battery cell is favored in the fields of electric vehicles, energy storage systems, etc.

[0003] In the related art, a fixing scheme of bundling a steel band is usually adopted for the stacked soft-pack solid-state battery cells, that is, a steel band is wound around the periphery of the stacked soft-pack solid-state battery cells and the head and tail of the steel band are welded to realize the assembly and fixation of the soft-pack solid-state battery cells.

[0004] Since the soft-pack solid-state battery cells will gradually swell in volume after multiple charging and discharging operations, the stress of the steel band on the swollen soft-pack solid-state battery cells gradually increases, and the steel band is prone to suddenly break under the action of the swelling stress, which causes high difficulty in the unpacking work of the battery. SUMMARY

[0005] Embodiments of the present disclosure provide a solid-state battery pack and a vehicle, which can solve the above technical problems existing in the related art. The technical solutions are as follows: In a first aspect, a solid-state battery pack is provided, which includes a lower bottom plate, an upper cover plate, a battery cell assembly, and a connecting bolt. The lower bottom plate has a first threaded hole. The upper cover plate has a second threaded hole, and the second threaded hole and the first threaded hole are opposite. The battery cell assembly is located between the lower bottom plate and the upper cover plate. The connecting bolt has a first threaded area and a second threaded area in opposite directions, the first threaded area is connected with the first threaded hole, and the second threaded area is connected with the second threaded hole.

[0006] In some possible implementations, the solid-state battery pack further includes a reinforcing plate, the reinforcing plate is attached to a side of the upper cover plate away from the lower bottom plate, the reinforcing plate has a third threaded hole, and the third threaded hole is connected with the second threaded area.

[0007] In some possible implementations, the battery cell assembly includes a plurality of battery cell layers and a plurality of heating layers, the battery cell layers and the heating layers are alternately stacked, the battery cell layers include a plurality of soft-pack solid-state battery cells connected in series, and the heating layers are used to increase the temperature of the soft-pack solid-state battery cells.

[0008] In some possible implementation manners, the solid-state battery pack further comprises a cold plate in contact with the soft-pack solid-state battery cell, the cold plate being provided with a flow channel for accommodating a cooling medium.

[0009] In some possible implementation manners, the battery cell assembly further comprises a heat dissipation plate in abutment with the cold plate, the heat dissipation plate comprising a plurality of heat dissipation grooves. The soft-pack solid-state battery cell has a heat dissipation pin in contact with a side wall of the heat dissipation groove.

[0010] In some possible implementation manners, the battery cell assembly further comprises a crimping assembly comprising an elastic member and a pressing plate, the elastic member driving the pressing plate to press the heat dissipation pin so that the heat dissipation pin is in contact with the side wall of the heat dissipation groove.

[0011] In some possible implementation manners, the battery cell assembly further comprises a temperature sensor between the battery cell layer and the heating layer.

[0012] In some possible implementation manners, the lower bottom plate, the upper cover plate and the reinforcing plate are all made of epoxy resin + glass fiber material.

[0013] In some possible implementation manners, the solid-state battery pack further comprises a sealing strip between the lower bottom plate and the upper cover plate and connected with the lower bottom plate.

[0014] In a second aspect, a vehicle is provided, and the vehicle comprises the solid-state battery pack according to any one of the first aspect.

[0015] The technical solutions provided by the present disclosure have at least the following beneficial effects: In the present disclosure, the lower bottom plate and the upper cover body are connected by connection bolts in a threaded connection, and during use of the battery cell assembly, the volume and the connecting stress between the lower bottom plate and the upper cover body can be adjusted by adjusting the connection positions of the lower bottom plate and the connection bolts and the connection positions of the upper cover body and the connection bolts, so that the stress applied by the expanded battery cell assembly to the lower bottom plate and / or the upper cover body is avoided from being too large, and the difficulty of disassembling the solid-state battery pack is reduced.

[0016] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0018] Figure 1 is a structural schematic diagram of a solid-state battery pack provided by an embodiment of the present disclosure; Figure 2 is a structural schematic diagram of an electric core assembly provided by an embodiment of the present disclosure; Figure 3 is a partial schematic diagram of an electric core assembly provided by an embodiment of the present disclosure; Figure 4 is a partial schematic diagram of a solid-state battery pack provided by an embodiment of the present disclosure.

[0019] Reference signs: 1, lower bottom plate; 11, first threaded hole; 12, first opening; 2, upper cover plate; 21, second threaded hole; 22, second opening; 3, electric core assembly; 3a, electric core layer; 3b, heating layer; 31, soft package solid-state electric core; 31a, heat dissipation pin; 31b, connecting pin; 32, heat dissipation plate; 32a, heat dissipation groove; 33, pressure contact assembly; 331, elastic member; 332, pressure plate; 34, temperature sensor; 35, controller; 4, connecting bolt; 41, first threaded area; 42, second threaded area; 5, reinforcing plate; 51, third threaded hole; 6, cold plate; 61, flow channel; 7, sealing strip.

[0020] The above drawings have shown the specific embodiments of the present disclosure, and more detailed descriptions will be given hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present disclosure by any means, but to illustrate the concept of the present disclosure to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present disclosure more clear, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0022] An embodiment of the present disclosure provides a solid-state battery pack, referring to Figure 1As shown, the solid-state battery pack includes a lower bottom plate 1, an upper cover plate 2, a battery cell assembly 3, and a connecting bolt 4.

[0023] The lower bottom plate 1 has a first threaded hole 11, the upper cover plate 2 has a second threaded hole 21, the second threaded hole 21 and the first threaded hole 11 are opposite, and the battery cell assembly 3 is located between the lower bottom plate 1 and the upper cover plate 2. The connecting bolt 4 has a first threaded area 41 and a second threaded area 42 with opposite directions, the first threaded area 41 is connected with the first threaded hole 11, and the second threaded area 42 is connected with the second threaded hole 21.

[0024] The connecting bolt 4 is a double-headed bolt, the first threaded area 41 and the second threaded area 42 have opposite screw rotation directions, and the first threaded area 41 is taken as a right-handed thread (tightened when rotating clockwise), and the second threaded area 42 is taken as a left-handed thread (tightened when rotating counterclockwise) for example: The first threaded hole 11 is matched with the right-handed thread of the first threaded area 41, and the second threaded hole 21 is matched with the left-handed thread of the second threaded area 42, so that when the connecting bolt 4 rotates clockwise, the first threaded hole 11 moves towards the bolt head, the second threaded hole 21 moves towards the bolt tail, and the distance between the lower bottom plate 1 and the upper cover plate 2 is increased; when the connecting bolt 4 rotates counterclockwise, the first threaded hole 11 moves towards the bolt tail, and the second threaded hole 21 moves towards the bolt head, and the distance between the lower bottom plate 1 and the upper cover plate 2 is shortened.

[0025] The lower bottom plate 1 and the upper cover plate 2 are connected by the connecting bolt 4, and during the use of the battery cell assembly 3, the connection position of the lower bottom plate 1 and the connecting bolt 4 and the connection position of the upper cover plate 2 and the connecting bolt 4 can be adjusted, and then the volume and the connection stress between the lower bottom plate 1 and the upper cover plate 5 are adjusted, so that the stress applied by the expanded battery cell assembly 3 to the lower bottom plate 1 and / or the upper cover plate 2 is not too large, and the difficulty of disassembling the solid-state battery pack is reduced.

[0026] In some embodiments, referring to Figure 1 As shown, the solid-state battery pack further includes a reinforcing plate 5, the reinforcing plate 5 is attached to the side of the upper cover plate 2 away from the lower bottom plate 1, the reinforcing plate 5 has a third threaded hole 51, the third threaded hole 51 is connected with the second threaded area 42, and the third threaded hole 51 is matched with the screw rotation direction of the second threaded area 42.

[0027] The reinforcing plate 5 can enhance the structural strength of the upper cover plate 2 and improve the resistance of the upper cover plate 2 to the expansion stress of the battery cell assembly 3.

[0028] In some embodiments, each second threaded hole 21 is opposite to the third threaded hole 51, and the position of each second threaded hole 21 is reinforced by the reinforcing plate 5.

[0029] In some other embodiments, part of the second threaded holes 21 is opposite to the third threaded holes 51, and the position of the second threaded holes 21 in the target area is reinforced by the reinforcing plate 5.

[0030] In some embodiments, referring to Figure 2 As shown in the figure, the battery cell assembly 3 includes a plurality of battery cell layers 3a and a plurality of heating layers 3b, the battery cell layers 3a and the heating layers 3b are alternately stacked, the battery cell layer 3a includes a plurality of soft package solid-state battery cells 31 connected in series, and the heating layer 3b is used to increase the temperature of the soft package solid-state battery cell 31.

[0031] The soft package solid-state battery cell 31 is a power battery cell that uses a solid-state electrolyte (such as oxide, sulfide, polymer, etc.) to replace the traditional liquid electrolyte and uses an aluminum plastic film for packaging. On the one hand, the solid-state electrolyte is non-flammable, non-corrosive, and non-leaking, and can greatly reduce the possibility of fire and explosion in extreme conditions such as puncture, short circuit, and overheating, making the battery cell have extremely high safety. The solid-state electrolyte can better inhibit the growth of lithium dendrites, greatly improve the energy density of the battery, and the solid-state electrolyte has more stable chemical properties and fewer side reactions, making the battery cell have a longer cycle life. On the other hand, the soft package packaging scheme using an aluminum plastic composite film as the shell makes the battery usually bulge and inflate when it experiences thermal runaway, reducing the possibility of a violent explosion. The aluminum plastic film shell is lighter than the metal shell (for example: cylindrical, square), and the design is flexible, and the shape can be customized according to the product space.

[0032] The heating layer 3b arranged in a stack can release heat to heat the soft package solid-state battery cell 31, so that the temperature of the soft package solid-state battery cell 31 of each battery cell layer 3a is in the optimal discharge interval, improving the overall working performance of the battery.

[0033] The number of soft package solid-state battery cells 31 contained in the battery cell layer 3a is not limited by the present disclosure and can be matched and set according to parameters such as the size, shape, and power design requirements of the solid-state battery pack. For example, the number of soft package solid-state battery cells 31 contained in each battery cell layer 3a is the same, the number of soft package solid-state battery cells 31 contained in each battery cell layer 3a is different, and the number of soft package solid-state battery cells 31 contained in part of the battery cell layers 3a is the same.

[0034] The specific elements of the heating layer 3b are not limited by the present disclosure and can be matched and set according to parameters such as heating rate, manufacturing cost, and heating precision. For example, the heating layer 3b can be a heating film, which is a soft, thin, and sheet-shaped electrothermal conversion element. The heating film can efficiently and uniformly convert electrical energy into heat energy and transfer it to each region of the two adjacent battery cell layers 3a.

[0035] In some embodiments, referring to Figure 1As shown, the solid-state battery pack further comprises a cold plate 6, the cold plate 6 is in contact with the soft-pack solid-state battery cell 31, and the cold plate 6 is provided with a flow channel 61 for accommodating a cooling medium.

[0036] The heat generated by the soft-pack solid-state battery cell 31 during charging and discharging can be transferred to the cold plate 6 and cooled by the cooling medium flowing in the flow channel 61, so as to avoid the temperature of the soft-pack solid-state battery cell 31 being too high and causing thermal runaway or fire and other adverse phenomena.

[0037] In some embodiments, the flow channel 61 is an open channel, that is, the flow channel 61 has an inlet and an outlet, and the cooling medium in the cooling container (for example, a liquid storage tank) enters the flow channel from the inlet, absorbs heat from the soft-pack solid-state battery cell 31 in the cold plate 6, and flows back to the cooling container from the outlet, thereby cooling and dissipating heat of the cooling medium.

[0038] In some other embodiments, the flow channel 61 is a closed channel, and the cooling medium circulates in the flow channel 61, absorbs heat in a first region of the flow channel 61, and releases heat in a second region of the flow channel 61, wherein the first region is the region close to the position where the cold plate 6 is in contact with the soft-pack solid-state battery cell 31, and the second region is the region away from the position where the cold plate 6 is in contact with the soft-pack solid-state battery cell 31.

[0039] In some embodiments, the cold plate 6 is connected to the lower bottom plate 1, so as to enhance the structural strength of the cold plate 6 and avoid the cold plate 6 from moving inside the solid-state battery pack and other adverse phenomena. At the same time, the cold plate 6 is made of three-series aluminum material, which is an aluminum alloy with manganese as the main alloying element and has excellent corrosion resistance and formability. The three-series aluminum has high ductility and can be subjected to deep drawing, deep drawing and other complex forming processes without cracking or wrinkling, thereby reducing the processing cost of the cold plate 6. The three-series aluminum has good corrosion resistance, and a dense aluminum oxide film is formed on its surface to prevent further corrosion of the internal metal, thereby avoiding corrosion of the cold plate 6 by the cooling medium and other liquids.

[0040] In some embodiments, as shown in Figure 1 and Figure 3 As shown, the battery cell assembly 3 further comprises a heat dissipation plate 32, the heat dissipation plate 32 is in abutment with the cold plate 6, the heat dissipation plate 32 comprises a plurality of heat dissipation grooves 32a, and the soft-pack solid-state battery cell 31 has a heat dissipation pin 31a, the heat dissipation pin 31a is in contact with the side wall of the heat dissipation groove 32a.

[0041] First, the side wall of the heat dissipation groove 32a is in contact with the heat dissipation pin 31a, ensuring that the heat generated by the soft package solid-state battery cell 31 can be quickly and timely transferred to the heat dissipation plate 32. Then, the heat dissipation plate 32 is in contact with the cold plate 6, and the contact area of the heat dissipation plate 32 and the cold plate 6 is large, thereby quickly and timely transferring heat to the cold plate 6, so as to improve the heat dissipation rate of the soft package solid-state battery cell 31 and the cold plate 6.

[0042] In some embodiments, referring to Figure 3 As shown, the battery cell assembly 3 further comprises a crimping assembly 33, and the crimping assembly 33 comprises an elastic member 331 and a pressing plate 332. The elastic member drives the pressing plate 332 to extrude the heat dissipation pin 31a, so that the heat dissipation pin 31a is in contact with the side wall of the heat dissipation groove 32a.

[0043] Under the elastic force of the elastic member 331, the two pressing plates 332 respectively in contact with the two side walls of the same heat dissipation groove 32a extrude the heat dissipation pin 31a, thereby ensuring that each heat dissipation pin 31a is effectively attached to the side wall of the corresponding heat dissipation groove 32a, thereby ensuring the heat transfer efficiency of the soft package solid-state battery cell 31 and the heat dissipation plate 32. When the solid-state battery pack is subjected to vibration, impact or the like, the heat dissipation pin 31a can maintain effective attachment to the side wall of the corresponding heat dissipation groove 32a.

[0044] In some embodiments, referring to Figure 2 As shown, the battery cell assembly 3 further comprises a temperature sensor 34, and the temperature sensor 34 is located between the battery cell layer 3a and the heating layer 3b. The temperature sensor 34 can detect the temperature of the soft package solid-state battery cell 31 of the battery cell layer 3a, and then adjust the working parameters of the heating layer 3b or the related parameters of the cold plate 6, so as to ensure that the soft package solid-state battery cell 31 is always within a reasonable working temperature range.

[0045] In some embodiments, referring to Figure 1 and Figure 2 As shown, the battery cell assembly 3 further comprises a controller 35, and the cold plate 6 has a motor for driving the flow of the cooling medium in the flow channel 61. The controller 35 is electrically connected to the temperature sensor 34, the heating layer 3b and the related elements (for example, the motor for driving the flow of the cooling medium) of the cold plate 6. The first temperature threshold and the second temperature threshold are stored in the controller 35, and the first temperature threshold is less than the second temperature threshold.

[0046] The controller 35 is configured to: acquire a plurality of temperature parameters collected by the plurality of temperature sensors 34, and compare the plurality of temperature parameters with a first temperature threshold and a second temperature threshold respectively; if a collected temperature parameter is less than or equal to the first temperature threshold, control the heating layer 3b corresponding to the temperature sensor 34 to increase the heating power and stop the motor from working; if the collected temperature parameter is between the first temperature threshold and the second temperature threshold, maintain the current working parameters of the heating layer 3b and the motor; and if the collected temperature parameter is greater than the second temperature threshold, control the heating layer 3b corresponding to the temperature sensor 34 to stop heating and increase the operating power of the motor.

[0047] The controller 35 can be one or more of an Application Specific Integrated Circuit (ASIC), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a Programmable Logic Device (PLD), a Central Processing Unit (CPU), or other electronic elements. The PLD can be a Complex Programmable Logic Device (CPLD), a Field-programmable Gate Array (FPGA), a Generic Array Logic (GAL), or any combination thereof, and the embodiments of the present application are not limited in this regard.

[0048] In some embodiments, the soft package solid-state battery cell 31 has a connecting pin 31b, the connecting pins 31b of the multi-layer soft package solid-state battery cell 31 are also stacked, the lower bottom plate 1 has a first opening 12, the upper cover plate 2 has a second opening 22, the first opening 12 is opposite to the second opening 22, and the connecting pin 31b is located between the first opening 12 and the second opening 22, thereby realizing a structure extending from the inside of the solid-state battery pack to the outside of the solid-state battery pack. The connecting pin 31b is used to be electrically connected with a wire or other charging and discharging elements to realize the charging and discharging work of the soft package solid-state battery cell 31.

[0049] In some embodiments, the lower bottom plate 1, the upper cover plate 2 and the reinforcing plate 5 are all made of epoxy resin + glass fiber material. The epoxy resin is used as a base to wrap the glass fiber, and the material thickness is accumulated by stacking multiple layers to ensure the strength and rigidity of the material, and also takes into account the lightweight design pursuit of the solid-state battery pack.

[0050] In some embodiments, the epoxy resin + glass fiber material is extruded into a complex cross-section through a pultrusion process, further improving the extrusion and impact resistance of the lower base plate 1, the upper cover plate 2 and the reinforcing plate 5. At the same time, the epoxy resin also ensures the insulation and corrosion resistance of the box formed by the lower base plate 1 and the upper cover plate 2, so that the weight of the box is reduced and the insulation performance is excellent.

[0051] In some embodiments, the macro Figure 4 As shown, the solid-state battery pack also includes a sealing strip 7 located between the lower base plate 1 and the upper cover plate 2 and connected to the lower base plate 1. The sealing strip 7 improves the sealing performance of the box formed by the lower base plate 1 and the upper cover plate 2, reducing the possibility of foreign matter (such as stones, rainwater, etc.) entering the interior of the solid-state battery pack from the gap between the lower base plate 1 and the upper cover plate 2.

[0052] At the same time, the sealing strip 7 also avoids the position of the first threaded hole 11 to avoid extrusion and damage to the sealing strip 7 by the connecting bolt 4 during the assembly of the solid-state battery pack.

[0053] In some embodiments, the connecting bolt 4 is made of 12.9 high-strength alloy steel, that is, the nominal tensile strength of the connecting bolt 4 is 1200 MPa, the nominal yield strength is 1080 MPa, and the yield strength ratio is 0.9, which means that the connecting bolt 4 will not have permanent deformation before reaching its yield strength (1080 MPa), has extremely high rigidity, and ensures the connection strength of the lower base plate 1 and the upper cover plate 2.

[0054] During the assembly of the connecting bolt 4, three-stage torque tightening is used: First stage: pre-tightening A relatively low torque value is used to quickly tighten the connecting bolt 4 until the lower base plate 1 and the upper cover plate 2 are initially fitted and the gap is eliminated.

[0055] Second stage: positioning A medium torque value is used to further tighten the connecting bolt 4 from the pre-tightening state. This torque value is usually set to overcome most of the elastic deformation so that the lower base plate 1 and the upper cover plate 2 enter a state of close contact.

[0056] When the set medium torque is reached, the system resets the position (rotation angle) of the connecting bolt 4 at this time to zero. This "zero point" is the unified reference datum for the final tightening of all subsequent connecting bolts 4.

[0057] Third stage: final tightening The tightening tool starts from the "angle zero point" set in the second stage and continues to rotate the connecting bolt 4 by a precisely set angle (such as 60° or 90°).

[0058] Based on the same concept, the embodiments of the present disclosure also provide a vehicle, which can include the solid-state battery pack according to any one of the above embodiments.

[0059] The vehicle adopts the solid-state battery pack in the present disclosure, the first threaded hole 11 is matched with the right-handed thread of the first threaded area 41, and the second threaded hole 21 is matched with the left-handed thread of the second threaded area 42, so that when the connecting bolt 4 is rotated clockwise, the first threaded hole 11 moves towards the bolt head direction, and the second threaded hole 21 moves towards the bolt tail direction, thereby realizing the increase of the distance between the lower bottom plate 1 and the upper cover plate 2; when the connecting bolt 4 is rotated counterclockwise, the first threaded hole 11 moves towards the bolt tail direction, and the second threaded hole 21 moves towards the bolt head direction, thereby realizing the shortening of the distance between the lower bottom plate 1 and the upper cover plate 2.

[0060] The lower bottom plate 1 and the upper cover body 2 are threadedly connected by the connecting bolt 4, and during the use of the battery cell assembly 3, the volume and the connecting stress between the lower bottom plate 1 and the upper cover body 5 can be adjusted by adjusting the connection position of the lower bottom plate 1 and the connecting bolt 4 and the connection position of the upper cover body 2 and the connecting bolt 4, thereby avoiding that the stress applied by the expanded battery cell assembly 3 to the lower bottom plate 1 and / or the upper cover body 2 is too large, and reducing the difficulty of disassembling the solid-state battery pack.

[0061] The type of the vehicle is not specifically limited in the present disclosure, for example, a sedan, a passenger car, a truck, a sport utility vehicle (SUV), etc., the vehicle can be a blade electric vehicle (BEV or EV for short), or a hybrid electric vehicle (HEV), for example, a range extender, a plug-in, etc.

[0062] In the description of the present specification, the description with reference to the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present disclosure. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0063] It can be understood that, in the present disclosure, "multiple" refers to two or more, and other quantifiers are similar. The "and / or" describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent: A exists alone, A and B exist together, and B exists alone. The character " / " generally represents that the associated objects before and after it are in an "or" relationship. The singular forms "a", "said" and "the" are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0064] It can be further understood that the terms "first", "second", and the like are used to describe various information, but these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other, and do not indicate a particular order or importance. In fact, the expressions "first", "second", and the like can be completely interchangeable. For example, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information without departing from the scope of the present disclosure.

[0065] It can be further understood that the terms "center", "longitudinal", "transverse", "front", "back", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation.

[0066] It can be further understood that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally formed; it can be mechanically connected, or it can be electrically connected or can communicate with each other; it can be directly connected between the two without other components, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0067] It can be further understood that, although the operations in the embodiments of the present disclosure are described in a specific order in the drawings, it should not be understood as requiring the operations to be performed in the specific order shown or in a serial order, or requiring all the operations to be performed to obtain the desired results. In a particular environment, multitasking and parallel processing can be advantageous.

[0068] Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the concepts disclosed herein. It is intended that the disclosure be construed as including any patents, patent applications, publications, publications, or other disclosure that modifies or adds to the function of the compositions or methods described herein or replaces purportedly equivalent elements with other known or later developed elements that do the same work in the same way to accomplish the same result. The specification and examples are to be regarded as exemplary in nature and not as restrictive.

[0069] It should be understood that the present disclosure is not limited to the precise structures as herein described and illustrated in the drawings, and that various modifications and changes can be made without departing from its scope. The scope of the present disclosure is limited only by the claims that follow.

Claims

1. A solid state battery pack, characterized by, The solid-state battery pack comprises a lower bottom plate (1), an upper cover plate (2), an electric core assembly (3) and a connecting bolt (4); The lower bottom plate (1) has a first threaded hole (11); The upper cover plate (2) has a second threaded hole (21), and the second threaded hole (21) and the first threaded hole (11) are opposite; The electric core assembly (3) is located between the lower bottom plate (1) and the upper cover plate (2); The connecting bolt (4) has a first threaded area (41) and a second threaded area (42) with opposite directions, the first threaded area (41) is connected with the first threaded hole (11), and the second threaded area (42) is connected with the second threaded hole (21).

2. The solid-state battery pack according to claim 1, wherein The solid-state battery pack further comprises a reinforcing plate (5), the reinforcing plate (5) is attached to the side of the upper cover plate (2) away from the lower bottom plate (1), and the reinforcing plate (5) has a third threaded hole (51), and the third threaded hole (51) is connected with the second threaded area (42).

3. The solid-state battery pack according to claim 1, wherein The electric core assembly (3) comprises a plurality of electric core layers (3a) and a plurality of heating layers (3b), the electric core layers (3a) and the heating layers (3b) are alternately stacked, the electric core layer (3a) comprises a plurality of soft package solid-state electric cores (31) connected in series, and the heating layer (3b) is used for increasing the temperature of the soft package solid-state electric core (31).

4. The solid-state battery pack according to claim 3, wherein The solid-state battery pack further comprises a cold plate (6), the cold plate (6) is in contact with the soft package solid-state electric core (31), and the cold plate (6) is provided with a flow channel (61) for accommodating a cooling medium.

5. The solid-state battery pack according to claim 4, wherein The electric core assembly (3) further comprises a heat dissipation plate (32), the heat dissipation plate (32) is in abutment with the cold plate (6), and the heat dissipation plate (32) comprises a plurality of heat dissipation grooves (32a); The soft package solid-state electric core (31) has a heat dissipation pin (31a), and the heat dissipation pin (31a) is in contact with the side wall of the heat dissipation groove (32a).

6. The solid-state battery pack according to claim 5, wherein The electric core assembly (3) further comprises a crimping assembly (33), the crimping assembly (33) comprises an elastic member (331) and a pressing plate (332), the elastic member drives the pressing plate (332) to press the heat dissipation pin (31a) so that the heat dissipation pin (31a) is in contact with the side wall of the heat dissipation groove (32a).

7. The solid-state battery pack according to claim 3, wherein The electric core assembly (3) further comprises a temperature sensor (34), and the temperature sensor (34) is located between the electric core layer (3a) and the heating layer (3b).

8. The solid-state battery pack according to claim 2, wherein The lower bottom plate (1), the upper cover plate (2) and the reinforcing plate (5) are all made of epoxy resin + glass fiber material.

9. The solid state battery pack of claim 1, wherein, The solid state battery pack further comprises a sealing strip (7), which is located between the lower bottom plate (1) and the upper cover plate (2) and connected with the lower bottom plate (1).

10. A vehicle characterized by comprising: The vehicle comprises the solid state battery pack as claimed in any one of claims 1-9.

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