High-performance quick-temperature-control all-solid-state square battery and preparation method thereof

Abstract

The invention relates to the technical field of solid-state batteries, and particularly provides a high-performance quick-temperature-control all-solid-state square battery and a preparation method thereof.The high-performance quick-temperature-control all-solid-state square battery comprises a shell, a pressing plate, a bottom plate, a cover plate, a roll core, a negative electrode busbar, a positive electrode busbar and two liquid guide fastening core rods, and the two liquid guide fastening core rods are located between the pressing plate and the bottom plate; the roll core is arranged on the two liquid guide fastening core rods in a laminated mode, the two ends of the roll core are pressed through the pressing plate and the bottom plate, the negative busbar and the positive busbar are connected with the negative tab and the positive tab on the two sides of the roll core respectively, the cover plate covers the pressing plate, and the positive pole and the negative pole of the cover plate are connected with the positive busbar and the negative busbar respectively. The shell is sleeved outside the roll core, two ends of the shell are respectively connected with the cover plate and the bottom plate in a sealing manner, and two ends of the drainage fastening core rod are respectively exposed through the cover plate and the bottom plate. The problem of poor heat dissipation capability of the battery cell is solved, the cycle rate capability of the battery is improved, the service life of the battery is prolonged, and the battery is simple to assemble, safe and reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of solid-state batteries, and in particular to a high-performance fast-temperature-control all-solid-state square battery and a preparation method thereof. Background Art

[0002] Compared with traditional wound lithium batteries, laminated lithium batteries have higher energy density, longer cycle life, better safety, higher flexibility and better heat dissipation performance, so they have broad application prospects and development potential. All-solid-state laminated lithium batteries are one of them. All-solid-state laminated lithium batteries include positive and negative electrodes, solid electrolytes and separators, in which the solid electrolyte and separator can be compounded into an integrated solid electrolyte membrane. The battery core is formed by staggered stacking of positive and negative electrodes and solid electrolyte membranes, and then wrapped with aluminum-plastic film. This structure can make full use of the internal space of the battery to improve the energy density, and its structure is stable and the internal resistance is small, so both the electrochemical performance and safety performance have good performance.

[0003] However, the above-mentioned soft-pack all-solid-state laminated lithium battery also has some challenges. Although it has advantages in safety, light weight, and process matching, the grouping efficiency is low, and it is difficult to apply the pressure required for the all-solid-state battery after grouping. Therefore, the solid-solid contact degree is low, the battery internal resistance is high, and the rate performance is poor. Moreover, since there is no liquid cooling channel inside, the heat dissipation capacity of the battery cell is poor, and there is often a temperature difference of 10-20°C between the internal temperature and the external temperature of the battery cell, especially during high-rate charging and discharging, the actual temperature difference may be greater. Soft-pack all-solid-state laminated lithium batteries have poor temperature control performance and are prone to thermal runaway, resulting in poor cycle performance and short cycle life.

[0004] To this end, this application is filed. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a high-performance fast temperature-control all-solid-state square battery and a preparation method thereof.

[0006] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0007] On the one hand, the present invention proposes a high-performance fast temperature control all-solid-state square battery, including: a shell, a pressure plate, a bottom plate, a cover plate, a winding core, a negative electrode bus, a positive electrode bus and a liquid conducting fastening core rod, wherein the two liquid conducting fastening core rods are located between the pressure plate and the bottom plate which are arranged opposite to each other, the winding core is stacked on the two liquid conducting fastening core rods and the upper and lower ends are pressed by the pressure plate and the bottom plate, the left and right sides of the winding core are respectively provided with negative electrode ears and positive electrode ears, the negative electrode bus and the positive electrode bus are respectively connected to the negative electrode ears and the positive electrode ears, the cover plate is covered on the pressure plate and the positive electrode column and the negative electrode column of the cover plate are respectively connected to the positive electrode bus and the negative electrode bus, the shell is sleeved outside the winding core and one end is connected to the cover plate seal and the other end is connected to the bottom plate seal, and the two ends of the liquid conducting fastening core rod are respectively exposed through the cover plate and the bottom plate.

[0008] Preferably, two second through holes are provided on the bottom plate at positions corresponding to the two liquid-conducting fastening core rods, and two first through holes are provided on the cover plate at positions corresponding to the two liquid-conducting fastening core rods, one end of the liquid-conducting fastening core rod is seamlessly connected to the first through hole, and the other end is seamlessly connected to the second through hole.

[0009] Preferably, the two second through holes are located at three equal parts of the bottom plate along its length direction, and the two first through holes are located at three equal parts of the cover plate along its length direction.

[0010] Preferably, one end of the two liquid-conducting fastening core rods is vertically welded or riveted to the bottom plate and seamlessly connected to the second through hole, and the other end is vertically welded or riveted to the cover plate and seamlessly connected to the first through hole.

[0011] Preferably, the winding core includes a stacked negative electrode sheet, a positive electrode sheet and an all-solid-state electrolyte membrane, the positive electrode tab and the negative electrode tab are respectively arranged on one side of the positive electrode sheet and the negative electrode sheet, the positive electrode tab and the negative electrode tab are respectively provided with second pores and first pores distributed along their respective width directions, the positive electrode tab and the negative electrode tab are respectively located on opposite sides of the winding core, the negative electrode bus is inserted in several first pores and welded to the negative electrode tab, and the positive electrode bus is inserted in several second pores and welded to the positive electrode tab.

[0012] Preferably, the lower surface of the cover plate is partially raised, and after the cover plate is welded to the negative electrode bus bar and the positive electrode bus bar, the partially raised lower surface thereof presses the pressing plate.

[0013] Preferably, the positive electrode tab and the negative electrode tab are respectively inverted on the positive electrode bus and the negative electrode bus.

[0014] Preferably, the negative busbar and the positive busbar are both T-shaped structures, and the T-shaped structure includes a horizontal section and a vertical section. The vertical section of the negative busbar is inserted in the first gap and welded to the negative electrode tab lying thereon, and the vertical section of the positive busbar is inserted in the second gap and welded to the positive electrode tab lying thereon, and the horizontal section of the negative busbar and the horizontal section of the positive busbar are both higher than the upper surface of the pressure plate and are both welded to the cover plate.

[0015] Preferably, the shell is any one of an aluminum shell, a steel shell, a copper alloy shell, and a magnesium alloy shell; the current collector of the positive electrode plate is an aluminum foil and the positive electrode tab is fully retained; the current collector of the negative electrode plate is a copper foil and the negative electrode tab is fully retained; the all-solid-state electrolyte membrane is selected from at least one of an oxide solid electrolyte, a sulfide solid electrolyte, a halide solid electrolyte, and a polymer solid electrolyte.

[0016] On the other hand, the present invention provides a method for preparing a high-performance fast temperature-controlled all-solid-state square battery, comprising the following steps:

[0017] S1. Fix two liquid-conducting fastening mandrels relatively to the bottom plate, and expose the bottom ends of the two liquid-conducting fastening mandrels through the bottom plate;

[0018] S2, inserting the all-solid electrolyte membrane, the positive electrode sheet, and the negative electrode sheet from the top of the liquid-conducting fastening core rod and stacking them thereon to form a winding core, and the negative electrode tab and the positive electrode tab are distributed on the left and right sides of the winding core;

[0019] S3, first insert the pressing plate from the top of the liquid-conducting fastening mandrel and press it on the top of the winding core with the help of external force, and then weld the pressing plate to the liquid-conducting fastening mandrel;

[0020] S4, connecting the negative electrode bus and the positive electrode bus to the negative electrode tab and the positive electrode tab respectively;

[0021] S5. The cover plate is placed on the pressing plate, the negative electrode column and the positive electrode column of the cover plate are welded to the negative electrode bus and the positive electrode bus respectively, and the top end of the liquid-guiding fastening core rod is exposed through the cover plate;

[0022] S6. Put the shell outside the winding core, one end of the shell is seamlessly connected to the cover plate, and the other end is seamlessly connected to the bottom plate.

[0023] Compared with the prior art, the present invention has at least the following beneficial effects:

[0024] 1. The addition of a liquid-guiding and fastening core rod effectively improves the heat dissipation performance of the battery, solves the problem of excessively high internal temperature of the battery during high-rate charge and discharge, reduces the temperature difference between the internal and external temperatures of the battery cell, and helps to increase the cycle life of the battery cell;

[0025] 2. The structural design of the liquid-guiding and tightening core rod forms a constraint on the inside of the winding core, and the structural design of the pressure plate and the bottom plate forms a pressurization on the winding core. The dual effects of constraint and pressurization can enhance the solid-solid contact inside, help reduce the internal resistance of the battery, improve the battery cycle rate performance, and inhibit the expansion of the battery core, thereby increasing the cycle life of the battery;

[0026] 3. The tabs are inverted on the busbar, which optimizes the tab welding form and solves the problem that the tabs of laminated batteries are too thick and inconvenient to weld. This not only reduces the difficulty of tab welding, but also helps to increase the upper limit of the number of laminates and the upper limit of capacity;

[0027] 4. The use of square aluminum shell packaging not only reduces the difficulty of all-solid-state battery grouping, making its assembly operation simple and efficient, but also improves the safety of the battery and helps to improve the overall energy density of the PACK. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 This is a schematic diagram of the explosion structure of the high-performance fast temperature control all-solid-state square battery proposed by the present invention;

[0030] Figure 2 This is the appearance of the high-performance fast temperature control all-solid-state square battery proposed by the present invention;

[0031] Figure 3 for Figure 1 Schematic diagram of the connection between the midsole plate and the liquid-conducting fastening core rod;

[0032] Figure 4 for Figure 1 Schematic diagram of the assembly of the middle roll core;

[0033] Figure 5 for Figure 1 Schematic diagram of the structure of the middle roll core;

[0034] Figure 6 for Figure 1 Schematic diagram of the connection relationship between the middle winding core, the pressing plate, the negative bus bar, and the positive bus bar;

[0035] Figure 7 for Figure 6 A schematic diagram of the enlarged structure at A in the middle;

[0036] Figure 8 This is a schematic diagram of the operational process for preparing the high-performance fast temperature-controlled all-solid-state square battery proposed in the present invention.

[0037] In the figure: 1. Shell; 2. Press plate; 3. Bottom plate; 4. Cover plate; 5. Winding core; 51. Negative electrode sheet; 511. Negative electrode ear; 512. First pore; 52. Positive electrode sheet; 521. Positive electrode ear; 522. Second pore; 53. All-solid-state electrolyte membrane; 6. Negative electrode bus; 7. Positive electrode bus; 8. Liquid-conducting fastening core rod. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0039] The structures or materials not described in detail in the following embodiments are all prior art, and the directional words such as "upper surface", "lower surface", "bottom surface", "upper and lower ends", "left and right sides" etc. used to clearly describe the component structure are only used to describe their relative positional relationship and are not used to limit the scope of protection of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of 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 invention, the meaning of "several" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0040] like Figure 1-Figure 7 The invention is shown in common: a high-performance fast temperature control all-solid-state square battery, comprising: a shell 1, a pressing plate 2, a bottom plate 3, a cover plate 4, a winding core 5, a negative electrode bus 6, a positive electrode bus 7 and a liquid conducting fastening core rod 8, two liquid conducting fastening core rods 8 are located between the pressing plate 2 and the bottom plate 3 which are arranged opposite to each other, the winding core 5 is laminated on the two liquid conducting fastening core rods 8 and the upper and lower ends are pressed by the pressing plate 2 and the bottom plate 3, and the left and right sides of the winding core 5 are respectively provided with negative electrode tabs 5 11 and the positive electrode tab 521, the negative electrode bus 6 and the positive electrode bus 7 are connected to the negative electrode tab 511 and the positive electrode tab 521 respectively, the cover plate 4 is covered on the pressure plate 2 and the positive electrode column and the negative electrode column of the cover plate 4 are connected to the positive electrode bus 7 and the negative electrode bus 6 respectively, the shell 1 is sleeved outside the winding core 5 and one end is sealed and connected to the cover plate 4, and the other end is sealed and connected to the bottom plate 3, and the two ends of the liquid guiding fastening core rod 8 are exposed through the cover plate 4 and the bottom plate 3 respectively.

[0041] Through the above-mentioned structural design: the liquid-conducting and fastening core rod 8 itself can realize rapid liquid cooling, improve the heat dissipation performance of the battery cell, solve the problem of excessive internal temperature of the battery during high-rate charging and discharging, reduce the temperature difference between the internal temperature of the battery cell and the external temperature, and improve the cycle life of the battery cell; the cover plate 4 and the bottom plate 3 form a pressurizing mechanism for squeezing the winding core 5, and the two liquid-conducting and fastening core rods 8 form a constraint inside the winding core 5. The dual effects of squeezing and constraining enhance the solid-solid contact inside the winding core 5, which helps to reduce the internal resistance of the battery, improve the battery cycle rate performance, and inhibit the expansion of the battery cell, thereby improving the cycle life of the battery; finally, the present invention obtains a high-performance fast temperature control all-solid-state square battery, which, compared with traditional soft-pack batteries, not only reduces the difficulty of grouping, but also improves the efficiency of grouping, makes the assembly operation simple, convenient, and efficient, helps to improve the overall energy density of the PACK, and also improves the safety of the battery.

[0042] It should be noted that:

[0043] The cover plate 4 is of prior art, and is similar to the cover plate of an existing square battery, and specifically also includes necessary structures such as a positive electrode column, a negative electrode column, and a pressure relief valve.

[0044] The shell 1 is an integrated square structure with openings at both ends, similar to the shell of an existing square battery, and is specifically made of metal, preferably obtained by integrated extrusion molding.

[0045] As a preferred technical solution, in another embodiment of the present invention, two second through holes are provided on the base plate 3 corresponding to the positions of the two liquid-conducting fastening core rods 8, and two first through holes are provided on the cover plate 4 corresponding to the positions of the two liquid-conducting fastening core rods 8. One end of the liquid-conducting fastening core rod 8 is seamlessly connected to the first through hole, and the other end is seamlessly connected to the second through hole, so that the two ends of the liquid-conducting fastening core rod 8 are connected to the outside through the base plate 3 and the cover plate 4 to inject coolant.

[0046] As a preferred technical solution, in another embodiment of the present invention, two of the second through holes are located at three equal parts of the bottom plate 3 along its length direction, and two of the first through holes are located at three equal parts of the cover plate 4 along its length direction.

[0047] In this embodiment, the two liquid-conducting fastening mandrels 8 are evenly distributed in the winding core 5. Under the constraint of the liquid-conducting fastening mandrels 8 and the extrusion of the bottom plate 3 and the cover plate 4, the winding core 5 has a high degree of solid-solid contact, a low internal resistance of the battery, and a good cycle rate performance of the battery. Moreover, with this distribution method, the liquid-conducting fastening mandrels 8 not only have a good effect on suppressing the expansion of the battery cell and significantly improve the cycle life of the battery, but also have a better liquid cooling effect, and the battery temperature control performance is significantly improved.

[0048] As a preferred technical solution, in another embodiment of the present invention, one end of the two liquid-conducting fastening core rods 8 is vertically welded or riveted to the base plate 3 and seamlessly connected to the second through hole, and the other end is vertically welded or riveted to the cover plate 4 and seamlessly connected to the first through hole.

[0049] In this embodiment, the two ends of the liquid-conducting fastening mandrel 8 are preferably welded to realize vertical connection with the bottom plate 3 and the cover plate 4 respectively. After the connection, the two ends of the liquid-conducting fastening mandrel 8 are exposed through the bottom plate 3 and the cover plate 4 to form the liquid inlet and liquid outlet of the coolant. In order to prevent the coolant from leaking, the two ends of the liquid-conducting fastening mandrel 8 are seamlessly connected with the first through hole and the second through hole by welding.

[0050] As a preferred technical solution, in another embodiment of the present invention, the winding core 5 includes a negative electrode sheet 51, a positive electrode sheet 52 and an all-solid electrolyte membrane 53 that are stacked, the positive electrode tab 521 and the negative electrode tab 511 are respectively arranged on one side of the positive electrode sheet 52 and the negative electrode sheet 51, and the positive electrode tab 521 and the negative electrode tab 511 are respectively provided with second pores 522 and first pores 512 distributed along their respective width directions, the positive electrode tab 521 and the negative electrode tab 511 are respectively located on opposite sides of the winding core 5, the negative electrode bus 6 is inserted in several first pores 512 and welded to the negative electrode tab 511, and the positive electrode bus 7 is inserted in several second pores 522 and welded to the positive electrode tab 521.

[0051] It should be noted that:

[0052] (1) The structure of the stack of negative electrode sheet 51, positive electrode sheet 52 and all-solid electrolyte membrane 53 is: all-solid electrolyte membrane 53, positive electrode sheet 52 (or negative electrode sheet 51), all-solid electrolyte membrane 53, negative electrode sheet 51 (or positive electrode sheet 52).

[0053] (2) The second pores 522 and the first pores 512 are both long strip-shaped pores, and specifically can be rectangular pores, pores with waist-shaped pore structures, etc. Other existing structures that facilitate the insertion of the busbar are also acceptable.

[0054] (3) To facilitate lamination, through holes are provided at positions corresponding to the two liquid-conducting fastening core rods 8 on the negative electrode plate 51, the positive electrode plate 52 and the all-solid-state electrolyte membrane 53. The size of the through holes is slightly larger than the liquid-conducting fastening core rods 8 so that the liquid-conducting fastening core rods 8 can be smoothly inserted from the top end.

[0055] (4) The negative electrode plate 51 and the positive electrode plate 52 are divided into a coating area with active material and a foil area without active material. The foil area without active material forms respective electrode ears. The pores for the busbar to penetrate are preferably arranged near the coating area so as to leave a larger welding position to achieve a stable connection between the electrode ear and the large surface of the busbar.

[0056] As a preferred technical solution, in another embodiment of the present invention, the lower surface of the cover plate 4 is partially raised, and after the cover plate 4 is welded with the negative electrode bus 6 and the positive electrode bus 7, the partially raised lower surface presses the pressing plate 2.

[0057] In this embodiment, the lower surface of the cover plate 4 is partially raised. When it contacts the pressure plate 2, the raised portion will contact the pressure plate 2 and press the pressure plate 2 through its hard connection with the negative bus 6 and the positive bus 7, further improving the stability of the entire battery structure.

[0058] As a preferred technical solution, in another embodiment of the present invention, the positive electrode tab 521 and the negative electrode tab 511 are respectively inverted on the positive electrode bus 7 and the negative electrode bus 6.

[0059] In this embodiment, after the busbar is inserted into the pore, the tabs are inverted on the busbar by technical means. The specific form of inversion is not limited. For example, all of them can be inverted downward, all of them can be inverted upward, or they can be divided into two parts, one part is inverted downward and the other part is inverted upward, forming a symmetrical inversion. Inversion can reduce the thickness of the tabs and form a dislocated welding position, which solves the problem that the tabs of the laminated battery are too thick and inconvenient to weld, reduces the difficulty of tab welding, and helps to increase the upper limit of the number of laminates and the upper limit of capacity.

[0060] As a preferred technical solution, in another embodiment of the present invention, the negative bus 6 and the positive bus 7 are both T-shaped structures, and the T-shaped structure includes a horizontal section and a vertical section. The vertical section of the negative bus 6 is inserted into the first hole 512 and welded to the negative electrode ear 511 lying thereon, and the vertical section of the positive bus 7 is inserted into the second hole 522 and welded to the positive electrode ear 521 lying thereon, and the horizontal section of the negative bus 6 and the horizontal section of the positive bus 7 are both higher than the upper surface of the pressure plate 2 so as to be welded to the cover plate 4.

[0061] In this embodiment, the T-shaped busbar not only facilitates the operation of inserting it into the pores of several layers of tabs, but also facilitates contact with the cover plate 4 for stable welding, thereby improving the stability of the winding core 5 in the shell 1.

[0062] As a preferred technical solution, in another embodiment of the present invention, the shell 1 is any one of an aluminum shell, a steel shell, a copper alloy shell, and a magnesium alloy shell, preferably an aluminum shell; the current collector of the positive electrode plate 52 is an aluminum foil and the positive electrode tab 521 is fully retained; the current collector of the negative electrode plate 51 is a copper foil and the negative electrode tab 511 is fully retained; the all-solid-state electrolyte membrane 53 is a prior art, which combines the functions of a solid electrolyte and a diaphragm, and the solid electrolyte is specifically selected from at least one of an oxide solid electrolyte, a sulfide solid electrolyte, a halide solid electrolyte, and a polymer solid electrolyte, preferably an oxide solid electrolyte.

[0063] In this embodiment, the design of fully retaining the positive electrode tab 521 and the negative electrode tab 511 can not only ensure the smooth transmission of current during the battery charging and discharging process, but also help to improve the structural stability of the battery. The tab can serve as a supporting structure to reduce the deformation of the battery during the charging and discharging process, and can also reduce heat, optimize heat dissipation, and increase energy density, providing strong support for battery performance improvement and safety assurance.

[0064] like Figure 8 As shown: The present invention also proposes a method for preparing a high-performance fast temperature-controlled all-solid-state square battery, comprising the following steps:

[0065] S1, fix two liquid-conducting fastening core rods 8 relatively to the bottom plate 3, after which the bottom ends of the two liquid-conducting fastening core rods 8 are exposed through the bottom plate 3 and then communicated with the outside;

[0066] S2, insert the all-solid electrolyte membrane 53, the positive electrode sheet 52, and the negative electrode sheet 51 from the top of the liquid-conducting fastening core rod 8 and stack them, and arrange the laminated sheets thereon to form a winding core 5, and the negative electrode tab 511 and the positive electrode tab 521 are distributed on the left and right sides of the winding core 5;

[0067] S3, first insert the pressing plate 2 from the top of the liquid-conducting and fastening mandrel 8 and press it on the top of the winding core 5 with the help of external force, and then weld the pressing plate 2 and the liquid-conducting and fastening mandrel 8 to fix the position of the pressing plate 2 and squeeze the winding core 5;

[0068] S4, connecting the negative busbar 6 and the positive busbar 7 to the negative electrode tab 511 and the positive electrode tab 521 respectively, specifically, welding the large surface of the busbar to the tab;

[0069] S5. The cover plate 4 is arranged on the pressing plate 2. The negative pole column and the positive pole column of the cover plate 4 are welded to the negative bus bar 6 and the positive bus bar 7 respectively. The top end of the liquid-conducting fastening mandrel 8 is exposed through the cover plate 4 and then communicated with the outside.

[0070] S6. Put the shell 1 outside the winding core 5, one end of the shell 1 is seamlessly connected to the cover plate 4 by laser welding or riveting, and the other end of the shell 1 is seamlessly connected to the bottom plate 3 by laser welding or riveting, so as to obtain a high-performance fast temperature control all-solid-state square battery.

[0071] Compared with the existing soft-pack all-solid-state laminated battery, the all-solid-state square battery proposed in the present invention not only has excellent electrochemical performance and temperature control performance, but also is packaged in a hard shell, so it is easy to group and has high efficiency. From the perspective of system integration, the present invention is easier to improve the overall energy density of the PACK and is more suitable for the development needs of solid-state batteries.

[0072] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. Those skilled in the art may change, modify, replace and deform the above embodiments within the scope of the present invention. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples without contradiction.

Claims

1. A high-performance fast temperature-control all-solid-state square battery, characterized in that: include: The shell (1), the pressing plate (2), the bottom plate (3), the cover plate (4), the winding core (5), the negative electrode bus bar (6), the positive electrode bus bar (7) and the liquid conducting fastening core rod (8), the two liquid conducting fastening core rods (8) are located between the pressing plate (2) and the bottom plate (3) which are arranged opposite to each other, the winding core (5) is stacked on the two liquid conducting fastening core rods (8) and the upper and lower ends are pressed by the pressing plate (2) and the bottom plate (3), and the left and right sides of the winding core (5) are respectively provided with a negative electrode tab (511) and a positive electrode tab (521) The negative electrode busbar (6) and the positive electrode busbar (7) are respectively connected to the negative electrode tab (511) and the positive electrode tab (521); the cover plate (4) is covered on the pressure plate (2) and the positive electrode column and the negative electrode column of the cover plate (4) are respectively connected to the positive electrode busbar (7) and the negative electrode busbar (6); the shell (1) is sleeved outside the winding core (5) and one end is sealed and connected to the cover plate (4) and the other end is sealed and connected to the bottom plate (3); the two ends of the liquid guide fastening core rod (8) are exposed through the cover plate (4) and the bottom plate (3) respectively.

2. The high-performance fast temperature control all-solid-state square battery according to claim 1, characterized in that: Two second through holes are arranged on the bottom plate (3) at positions corresponding to the two liquid-conducting fastening core rods (8), and two first through holes are arranged on the cover plate (4) at positions corresponding to the two liquid-conducting fastening core rods (8), one end of the liquid-conducting fastening core rod (8) is seamlessly connected to the first through hole, and the other end is seamlessly connected to the second through hole.

3. The high-performance fast temperature control all-solid-state square battery according to claim 2, characterized in that: The two second through holes are located at three equal parts of the bottom plate (3) along its length direction, and the two first through holes are located at three equal parts of the cover plate (4) along its length direction.

4. The high-performance fast temperature control all-solid-state square battery according to claim 2, characterized in that: One end of the two liquid-conducting fastening core rods (8) is vertically welded or riveted to the bottom plate (3) and seamlessly connected to the second through hole, and the other end is vertically welded or riveted to the cover plate (4) and seamlessly connected to the first through hole.

5. The high-performance fast temperature control all-solid-state square battery according to claim 1, characterized in that: The winding core (5) comprises a stacked negative electrode sheet (51), a positive electrode sheet (52) and an all-solid electrolyte membrane (53); the positive electrode tab (521) and the negative electrode tab (511) are respectively arranged on one side of the positive electrode sheet (52) and the negative electrode sheet (51); the positive electrode tab (521) and the negative electrode tab (511) are respectively provided with a second pore (522) and a first pore (512) distributed along their respective width directions; the positive electrode tab (521) and the negative electrode tab (511) are respectively located on opposite sides of the winding core (5); the negative electrode bus bar (6) is inserted into a plurality of the first pores (512) and welded to the negative electrode tab (511); and the positive electrode bus bar (7) is inserted into a plurality of the second pores (522) and welded to the positive electrode tab (521).

6. The method for preparing a high-performance fast temperature-control all-solid-state square battery according to claim 5, characterized in that: The lower surface of the cover plate (4) is partially raised, and after the cover plate (4) is welded to the negative electrode bus bar (6) and the positive electrode bus bar (7), the lower surface is pressed against the pressing plate (2).

7. The high-performance fast temperature control all-solid-state square battery according to claim 5, characterized in that: The positive electrode tab (521) and the negative electrode tab (511) are respectively inverted on the positive electrode bus bar (7) and the negative electrode bus bar (6).

8. The high-performance fast temperature control all-solid-state square battery according to claim 7, characterized in that: The negative electrode busbar (6) and the positive electrode busbar (7) are both T-shaped structures, and the T-shaped structure includes a horizontal section and a vertical section. The vertical section of the negative electrode busbar (6) is inserted into the first aperture (512) and welded to the negative electrode tab (511) lying thereon, and the vertical section of the positive electrode busbar (7) is inserted into the second aperture (522) and welded to the positive electrode tab (521) lying thereon. The horizontal section of the negative electrode busbar (6) and the horizontal section of the positive electrode busbar (7) are both higher than the upper surface of the pressing plate (2) and are both welded to the cover plate (4).

9. The high-performance fast temperature control all-solid-state square battery according to any one of claims 5 to 8, characterized in that: The housing (1) is any one of an aluminum housing, a steel housing, a copper alloy housing, and a magnesium alloy housing; The current collector of the positive electrode plate (52) is aluminum foil and the positive electrode tab (521) is fully retained; The current collector of the negative electrode plate (51) is copper foil and the negative electrode tab (511) is completely retained; The all-solid electrolyte membrane (53) is selected from at least one of oxide solid electrolytes, sulfide solid electrolytes, halide solid electrolytes, and polymer solid electrolytes.

10. A method for preparing a high-performance fast temperature-control all-solid-state square battery according to any one of claims 1 to 9, characterized in that: The steps are as follows: S1. Fix two liquid-conducting fastening mandrels (8) relatively to the bottom plate (3), with the bottom ends of the two liquid-conducting fastening mandrels (8) exposed through the bottom plate (3); S2, inserting the all-solid electrolyte membrane (53), the positive electrode sheet (52), and the negative electrode sheet (51) from the top end of the liquid-conducting fastening core rod (8) and stacking them thereon to form a winding core (5), and the negative electrode tab (511) and the positive electrode tab (521) are distributed on the left and right sides of the winding core (5); S3, first insert the pressing plate (2) from the top end of the liquid-conducting and fastening core rod (8) and press it onto the top end of the winding core (5) with the help of external force, and then weld the pressing plate (2) and the liquid-conducting and fastening core rod (8); S4, connecting the negative electrode busbar (6) and the positive electrode busbar (7) to the negative electrode tab (511) and the positive electrode tab (521) respectively; S5. The cover plate (4) is arranged on the pressing plate (2), the negative electrode column and the positive electrode column of the cover plate (4) are welded to the negative electrode bus bar (6) and the positive electrode bus bar (7) respectively, and the top end of the liquid-conducting fastening core rod (8) is exposed through the cover plate (4); S6. The shell (1) is placed outside the winding core (5), one end of the shell (1) is seamlessly connected to the cover plate (4), and the other end is seamlessly connected to the bottom plate (3).

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