Interval phase change heat-structure integrated battery pack

Abstract

The invention discloses an interstitial phase change heat-structure integrated battery pack, which is characterized in that a condensation plate is positioned at the top of a heat-structure body, a working medium cavity is enclosed between the condensation plate and the heat-structure body, each core body cover plate is positioned at the bottom of the heat-structure body, a plurality of independent core body cavities are enclosed between the heat-structure body and the core body cover plates, a core body is arranged in each core body cavity, and the heat-structure body and the core body cover plates are arranged in the heat-structure body. The positive electrode, the negative electrode and the anti-explosion valve are located on the core body cover plate, the anti-explosion valve is located between the positive electrode and the negative electrode, the smoke guide grooves and the supporting ribs are alternately arranged on the bottom surface of the inner side of the battery pack box body, the supporting ribs are located at the outer side edges of the positive electrode and the negative electrode, and the smoke guide grooves are located under the core body assembly. The battery pack has the characteristics of good condensation effect, high integration level and high safety.

Description

Technical Field

[0001] The present invention belongs to the technical field of thermal management of power battery packs, and relates to a gap phase change heat-structure integrated battery pack. Background Art

[0002] The power battery pack of an electric vehicle is a key component that determines the vehicle performance. The pursuit of the energy density and thermal safety of the battery pack drives the continuous iteration of the battery pack design. In terms of improving the energy density, from the traditional cell-module-pack (CMP) to the cell-to-pack (CTP) design, the space and weight of the module are saved; the cell inversion technology combines the space for components such as insulating sheets above the pole column in the upright scheme with the buffer space at the bottom of the cell, reducing by 5-10 mm in the height direction and achieving an improvement in space utilization. The cell housing is usually made of metal materials or aluminum plastic films, which account for a large proportion of the cost. As a further scheme to improve the integration density, the patent CN212517324U proposed a design scheme from the core directly to the module (Jellyroll-To-Module, abbreviated as JTM), omitting the cell housing. However, this scheme does not give a specific thermal management structure design, while the patent CN221614021U proposed a design that integrates a liquid cooling plate into the battery pack bottom plate, indicating that incorporating thermal management components into the battery pack design consideration is also a feasible scheme to further improve the energy density. In terms of thermal management and thermal safety design, it has experienced the transformation from air cooling, liquid cooling and gradually to the gas-liquid phase change method. The patent WO2011105256A1 proposed a battery thermal management system based on immersion gas-liquid phase change, but there are still many problems to be solved in its practical application. For example, this scheme still does not give a specific battery fixing and structure protection design; it is difficult to ensure the airtightness of the battery pack during long-term service, and if impurity gases penetrate, the condensation effect will be affected; in the direct immersion design, the compatibility of heat insulation, sealing, cables, structural adhesives, thermal interface materials, etc. with the working medium is still unclear, etc. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above-mentioned disadvantages of the prior art, and provide a gap phase change heat-structure integrated battery pack, which has the characteristics of good condensation effect, high integration degree and high safety.

[0004] To achieve the above purpose, the present invention discloses a gap phase change heat-structure integrated battery pack, including a battery pack box body and a condensation plate, a heat-structure body, a support rib, a battery pack box body, a flue gas diversion groove, a core assembly, an electrode connection piece, and a signal acquisition line arranged in the battery pack box body; the core assembly includes a positive electrode, a negative electrode, an explosion-proof valve and a plurality of core covers;

[0005] The condensation plate is located at the top of the heat-structural body. A working fluid chamber is formed between the condensation plate and the heat-structural body. Each core cover plate is located at the bottom of the heat-structural body. A number of independent core chambers are formed between the heat-structural body and the core cover plates. Each core chamber is provided with a core. The positive electrode, negative electrode and explosion-proof valve are located on the core cover plate. The explosion-proof valve is located between the positive electrode and the negative electrode. The flue gas diversion grooves and support ribs are alternately arranged on the bottom surface inside the battery pack box body. Among them, the support ribs are located at the outer edges of the positive electrode and the negative electrode, and the flue gas diversion grooves are located directly below the core assembly.

[0006] The outlet of the flue gas diversion channel in the flue gas diversion groove is connected to the flue gas diversion interface on the battery pack box body. The explosion-proof valve is directly opposite to the explosion-proof valve interface on the flue gas diversion groove. The electrode connecting piece is connected between the positive electrode and the negative electrode. The signal acquisition line is connected to the positive electrode and the negative electrode.

[0007] Furthermore, reinforcing ribs are arranged in the working fluid chamber.

[0008] Furthermore, the opening of the working fluid chamber faces upward, and the opening of the core chamber faces downward. The opening on the working fluid chamber is connected to the condensation plate to seal the working fluid chamber. The opening on the core chamber is connected to the core cover plate to seal the core chamber.

[0009] Furthermore, the core is processed by using a winding or laminating process.

[0010] Furthermore, the side wall and top surface of the core chamber are both adjacent to the working fluid chamber. There is a gap between the side walls of adjacent core chambers, and the working fluid chamber is clamped in the middle to form a vertical gap interlayer. A horizontal gap interlayer is formed between the top surface of the core chamber and the bottom surface of the condensation plate. The vertical gap interlayer and the horizontal gap interlayer are interconnected as a whole to jointly form the working fluid chamber.

[0011] Furthermore, a gas-liquid phase change working fluid is filled in the working fluid chamber, and the periphery and top surface of the core chamber are submerged by the liquid working fluid.

[0012] Furthermore, during operation, the heat generated by the charging and discharging of the core passes through the wall surface of the heat-structural body and is transferred to the gas-liquid phase change working fluid in the working fluid chamber. The gas-liquid phase change working fluid boils and undergoes a phase change when heated, and takes away heat through the latent heat absorbed when it is converted from liquid to gas. The generated vapor rises and converges to the lower surface of the condensation plate at the top of the working fluid chamber. Subsequently, the vapor is condensed back into liquid and drips back into the liquid pool below.

[0013] Furthermore, the core assembly is arranged in an inverted distribution.

[0014] Furthermore, the lower surface of the condensation plate is provided with a concavo-convex structure or a fin structure.

[0015] Furthermore, the reinforcing ribs adopt a prismatic structure.

[0016] The present invention has the following beneficial effects:

[0017] The gap phase change thermal-structural integrated battery pack described in the present invention has advantages in thermal management, thermal safety, structural safety and integration during specific operation:

[0018] In terms of thermal management, the sides and top surfaces of the core cavity are adjacent to the working fluid cavity, and the heat dissipation area is expanded; the heat dissipation power is greatly improved compared with the traditional sensible heat dissipation method through the latent heat dissipation of gas-liquid phase change. The temperature is maintained near the boiling point during the boiling phase change of the working fluid to ensure the temperature uniformity between batteries. The core is directly encapsulated in the core cavity, and the heat generated only needs to pass through the wall of the heat-structure to be transferred to the heat dissipation working fluid, reducing contact and thermal resistance. The condensation plate adopts a simple straight-through flow channel, which helps to reduce pump power consumption. High heat dissipation power and high temperature uniformity provide support for fast charging.

[0019] In terms of thermal safety, the cores are completely isolated by gap interlayers filled with phase change fluid. When a core experiences thermal runaway, the heat can be quickly absorbed by the phase change fluid, and the entire fluid cavity is connected, so there will be no local evaporation of the fluid. Therefore, the protective effect of the gap interlayer is better than that of traditional insulation pads, which can prevent the spread of thermal runaway in the battery pack. The core assembly adopts an inverted solution. The explosion-proof valve of the core assembly faces the explosion-proof interface on the flue gas diversion groove. The space of the flue gas diversion groove can fully guarantee the release of the explosion-proof valve and the export of emissions. All flue gas diversion groove outlets are collected in the hollow energy absorption cavity at the rear of the battery pack body and discharged through the total pressure relief port. The area between the flue gas diversion groove and the support rib is the electrical connection channel, and the electrode connecting piece and the signal acquisition line are located in the electrical connection channel. This design achieves complete thermal and electrical separation, which can prevent emissions from thermal runaway from affecting electrical connections.

[0020] In terms of structural safety, the support ribs and smoke diversion grooves serve as profiles to reinforce the battery pack box and provide buffer space for bottom impact. The thermal-structure has a honeycomb shape with reinforcing ribs inside, which has a certain structural strength. The gap interlayer between the core cavities can provide deformation and displacement space. There are energy-absorbing cavities around the battery pack box. The gap interlayer between the core cavities can also provide space for the breathing and expansion effect of the battery, avoiding damage to the battery pack caused by battery expansion. The above designs all help to improve the structural safety of the battery pack.

[0021] In terms of integration, the core is directly encapsulated in the core cavity, omitting the outer shell of the complete battery and the insulation, fire protection, structural adhesive and thermal interface materials required for assembling the complete battery, reducing the production steps, saving volume, weight and cost, and improving the energy density of the battery pack.

[0022] Compared with the direct immersion method, the working fluid is encapsulated in an independent working fluid chamber without contacting the outside world, and the sealing and material compatibility problems mentioned in the "Technical Background" will not occur. At the same time, since the core of the battery is directly encapsulated in the core chamber, the heat can be transferred to the phase change working fluid in the working fluid chamber by passing through the wall of the heat-structural body. In the direct immersion scheme, the heat of the core needs to pass through the battery shell to be transferred to the phase change working fluid. Therefore, the two have equivalent contact and thermal conduction thermal resistances. Description of the Drawings

[0023] The accompanying drawings forming a part of this invention are used to provide a further understanding of the invention. The schematic embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention. In the drawings:

[0024] Figure 1 is the overall appearance view of the present invention;

[0025] Figure 2 is the exploded view of the main components in the present invention;

[0026] Figure 3 is Figure 1 the plane cross-sectional view at position A in

[0027] Figure 4 is Figure 1 the three-dimensional cross-sectional view at position B in

[0028] Among them, 1 is the battery pack box body, 2 is the heat-structural body, 3 is the condensation plate, 4 is the core assembly, 5 is the support rib, 6 is the electrode connection piece, 7 is the signal acquisition line, 8 is the flue gas diversion groove, 1-1 is the energy absorption cavity, 1-2 is the flue gas diversion interface, 1-3 is the total pressure relief port, 2-1 is the working fluid chamber, 2-2 is the core chamber, 2-3 is the reinforcing rib, 3-1 is the convex support, 4-1 is the core, 4-2 is the positive electrode, 4-3 is the core cover plate, 4-4 is the explosion-proof valve, 4-5 is the negative electrode, 8-1 is the flue gas diversion channel, and 8-2 is the explosion-proof valve interface. Detailed Embodiments

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] In the description of the present invention, it should be understood that the terms "include" and "comprise" indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0031] It should also be understood that the terms used in the description of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the description of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0032] It should be further understood that the term "and / or" used in the description of the present invention and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present invention generally represents an "or" relationship between the contextually related objects.

[0033] It should be understood that although the terms first, second, third, etc. may be used in the embodiments of the present invention to describe preset ranges, etc., these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0034] Depending on the context, the word "if" as used herein can be interpreted as "when" or "while" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrase "if determined" or "if detected (stated condition or event)" can be interpreted as "when determined" or "in response to determining" or "when detected (stated condition or event)" or "in response to detecting (stated condition or event)".

[0035] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the present invention described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0036] Schematic diagrams of various structures according to the disclosed embodiments of the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and for the purpose of clear illustration, some details are enlarged and some details may be omitted. The shapes of various regions and layers shown in the figures, as well as their relative sizes and positional relationships, are merely exemplary and may deviate in practice due to manufacturing tolerances or technical limitations. Those skilled in the art can design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0037] Referring to Figures 1 to 4 , the gap phase change heat - structure integrated battery pack according to the present invention includes a battery pack box body 1, a heat - structure body 2, a condensation plate 3, a core assembly 4, a support rib 5, an electrode connection piece 6, a signal acquisition wire 7, and a flue gas diversion groove 8. The battery pack box body 1 includes an energy absorption cavity 1 - 1, a flue gas diversion interface 1 - 2, and a total pressure relief port 1 - 3; the heat - structure body 2 includes a working medium cavity 2 - 1, a core cavity 2 - 2, and a reinforcing rib 2 - 3; the condensation plate 3 includes a convex support 3 - 1 on the lower surface; the core assembly 4 includes a core 4 - 1, a positive electrode 4 - 2, a core cover plate 4 - 3, an explosion - proof valve 4 - 4, and a negative electrode 4 - 5; the flue gas diversion groove 8 includes a flue gas diversion channel 8 - 1 and an explosion - proof valve interface 8 - 2.

[0038] The condensation plate 3 is located at the top of the heat - structure body 2. A working medium cavity 2 - 1 is formed between the condensation plate 3 and the heat - structure body 2, and the reinforcing rib 2 - 3 is located in the working medium cavity 2 - 1; each core cover plate 4 - 3 is located at the bottom of the heat - structure body 2. A plurality of independent core cavities 2 - 2 are formed between the heat - structure body 2 and the core cover plates 4 - 3, and a plurality of cores 4 - 1 are located in the plurality of core cavities 2 - 2. The positive electrode 4 - 2, the negative electrode 4 - 5, and the explosion - proof valve 4 - 4 are located on the core cover plate 4 - 3, and the explosion - proof valve 4 - 4 is located between the positive electrode 4 - 2 and the negative electrode 4 - 5. The flue gas diversion grooves 8 and the support ribs 5 are alternately arranged on the inner bottom surface of the battery pack box body 1 to support the heat - structure body 2 and the core assembly 4. Among them, the support ribs 5 are located at the outer edges of the positive electrode 4 - 2 and the negative electrode 4 - 5, the flue gas diversion grooves 8 are located directly below the core assembly 4, the outlet of the flue gas diversion channel 8 - 1 in the flue gas diversion groove 8 is connected to the flue gas diversion interface 1 - 2 on the battery pack box body 1, and the explosion - proof valve 4 - 4 is directly opposite to the explosion - proof valve interface 8 - 2 on the flue gas diversion groove 8. The electrode connection piece 6 performs series / parallel connection between the positive electrode 4 - 2 and the negative electrode 4 - 5. The signal acquisition wire 7 is connected to the positive electrode 4 - 2 and the negative electrode 4 - 5.

[0039] In this embodiment, the working fluid chamber 2-1 and a number of independent core chambers 2-2 are separated by the wall surface of the thermal-structural body 2, and both are open semi-open structures. Among them, the opening of the working fluid chamber 2-1 faces upward, and the opening of the core chamber 2-2 faces downward. The upward opening of the working fluid chamber 2-1 is connected to the condensation plate 3, so that the working fluid chamber 2-1 is sealed. The downward opening of the core chamber 2-2 is connected to the core cover plate 4-3, so that the core chamber 2-2 is sealed.

[0040] In this embodiment, the shape of the core chamber 2-2 is processed according to the shape of the core 4-1, and it can be a square, cylindrical or soft-packaged core.

[0041] In this embodiment, the core 4-1 can adopt winding or lamination process.

[0042] In this embodiment, a complete battery with a housing can be used to replace the core assembly 4. In this embodiment, a heat-conducting material can be provided between the battery housing and the wall surface of the core chamber 2-2 to reduce the contact thermal resistance.

[0043] In this embodiment, the thermal-structural body 2 can be manufactured by stamping, sheet metal, welding, drawing, metal injection, squeeze casting and other methods.

[0044] In this embodiment, the connection between the thermal-structural body 2, the condensation plate 3 and the core cover plate 4-3 is welded to ensure sealing.

[0045] In this embodiment, the side wall and the top surface of the core chamber 2-2 are adjacent to the working fluid chamber 2-1. There is a gap between the side walls of the core chamber 2-2, and the working fluid chamber 2-1 is sandwiched in the middle, forming a vertical gap sandwich. A horizontal gap sandwich is formed between the top surface of the core chamber 2-2 and the bottom surface of the condensation plate 3. The vertical gap sandwich and the horizontal gap sandwich are connected to each other as a whole to jointly form the working fluid chamber 2-1.

[0046] In this embodiment, reinforcing ribs 2-3 are provided in the vertical gap sandwich of the working fluid chamber 2-1, and the bottom surface of the reinforcing ribs 2-3 does not touch the bottom surface of the vertical gap sandwich in the working fluid chamber 2-1, ensuring that the working fluid in the working fluid chamber 2-1 is interconnected and flows at the bottom.

[0047] In this embodiment, the reinforcing ribs 2-3 adopt a prism shape. According to different installation positions, the cross-section has four forms: square, L-shaped, T-shaped, and cross-shaped, and the connection method can be welding, snap-fastening, mortise and tenon, etc.

[0048] In this embodiment, a gas-liquid phase change working fluid is filled in the working fluid chamber 2-1, and the filling amount completely submerges the vertical gap sandwich in the working fluid chamber 2-1 and reaches half of the thickness of the horizontal gap sandwich in the working fluid chamber 2-1, ensuring that the periphery and the top surface of the core chamber 2-2 are submerged by the liquid working fluid.

[0049] In this embodiment, the optional working fluids include ultrapure water, Novec 7000 engineering fluid, R1336mzz refrigerant, etc. According to the type of working fluid, the pressure in the working fluid chamber 2-1 is adjusted during filling so that the boiling point of the working fluid is maintained in the optimal operating temperature range of the battery.

[0050] In this embodiment, heat management is performed based on the phase change in the interlayer of the working fluid chamber 2-1: the heat generated by the charging and discharging of the core 4-1 is transferred to the gas-liquid phase change working fluid in the working fluid chamber 2-1 through the wall of the heat-structure 2, and the working fluid is heated and changes phase, and the latent heat absorbed when the liquid is converted into gas takes away the heat, and the generated steam rises and converges to the top of the working fluid chamber 2-1 and the lower surface of the condensation plate 3, and then the steam is condensed back to the liquid state and drips back into the liquid pool below. The heat released by condensation is taken away by the medium in the condensation plate 3, such as cooling water.

[0051] In this embodiment, the condensing plate 3 includes a raised support 3-1 on the lower surface, the height of the raised support 3-1 is equal to the thickness of the transverse gap sandwich in the core cavity 2-2, and when the condensing plate 3 is assembled on the top of the heat-structure 2, the raised support 3-1 just passes through the transverse gap sandwich and contacts the wall surface of the heat-structure 2 at the corresponding position, and the two are connected at the contact position by spot welding. The raised support 3-1 ensures that the large-span condensing plate 3 will not be concave under the action of external loads, and will not bulge under the action of the internal pressure of the working medium cavity 2-1.

[0052] In this embodiment, the lower surface of the condensation plate 3 may adopt a design to enhance condensation, such as adopting a hydrophobic surface, adding concave and convex or fin structures to increase the heat dissipation area, etc.

[0053] In this embodiment, the condensation plate 3 and the core 4-1 are isolated by the working fluid chamber 2-1. The heat of the core 4-1 is transferred to the condensation plate 3 through the boiling and condensation of the working fluid. Therefore, the inlet and outlet temperature difference of the condensation plate 3 will not affect the temperature uniformity of the core 4-1. The condensation plate 3 can adopt a simple straight-through flow channel without using a complex flow shape to balance the temperature difference.

[0054] In this embodiment, the support ribs 5 and the smoke guide grooves 8 are rigidly connected to the battery pack body 1 by welding, bolts or the like.

[0055] In this embodiment, the core assembly 4 is inverted, and the explosion-proof valve 4-4 of the core assembly 4 is directly opposite to the explosion-proof valve interface 8-2 on the smoke diversion groove 8. The front end of the smoke diversion groove 8 is sealed, and the rear end outlet is connected to the smoke diversion interface 1-2 of the battery pack box 1. The smoke diversion channel 8-1 is collected in the hollow energy absorption cavity 1-1 at the rear of the battery pack box 1, and a total pressure relief port 1-3 is provided on the hollow energy absorption cavity 1-1.

[0056] Other embodiments of the present invention will be readily contemplated by those skilled in the art in view of the specification and the disclosure of the invention. This application is intended to cover any variations, uses, or adaptations of the present invention, which follow the general principles of the present invention and include known common knowledge or conventional technical means in the technical field not disclosed in the present invention. The specification and the embodiments are only regarded as exemplary, and the true scope and spirit of the present invention are pointed out by the following claims.

[0057] It should be understood that the present invention is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present invention is only limited by the appended claims.

[0058] The above are only the preferred embodiments of the present invention, and do not impose any limitations on the present invention. Any simple modifications, changes, and equivalent structural changes made to the above embodiments according to the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A gap phase change heat-structure integrated battery pack, characterized in that The battery pack comprises a battery pack box (1), a condensation plate (3) arranged in the battery pack box (1), a heat-structure (2), a support rib (5), a battery pack box (1) and a core assembly (4); the core assembly (4) comprises a positive electrode (4-2), a negative electrode (4-5), an explosion-proof valve (4-4) and a plurality of core cover plates (4-3); The condensation plate (3) is located at the top of the heat-structure (2), and a working medium cavity (2-1) is formed between the condensation plate (3) and the heat-structure (2), and the working medium cavity (2-1) is filled with a gas-liquid phase change working medium. Each core cover plate (4-3) is located at the bottom of the heat-structure (2), and a plurality of independent core cavities (2-2) are formed between the heat-structure (2) and the core cover plates (4-3), and each core cavity (2-2) is provided with a core (4-1), and the positive electrode The positive electrode (4-2), the negative electrode (4-5) and the explosion-proof valve (4-4) are located on the core cover plate (4-3), the explosion-proof valve (4-4) is located between the positive electrode (4-2) and the negative electrode (4-5), and the smoke guide groove (8) and the support rib (5) are alternately arranged on the bottom surface of the inner side of the battery pack box (1), wherein the support rib (5) is located at the outer edge of the positive electrode (4-2) and the negative electrode (4-5), and the smoke guide groove (8) is located directly below the core assembly (4).

2. The gap phase change heat - structure integrated battery pack according to claim 1, wherein, The outlet of the smoke guide channel (8-1) in the smoke guide groove (8) is connected to the smoke guide interface (1-2) on the battery pack box (1), the explosion-proof valve (4-4) faces the explosion-proof valve interface (8-2) on the smoke guide groove (8), the electrode connecting piece (6) is connected between the positive electrode (4-2) and the negative electrode (4-5), and the signal collection line (7) is connected to the positive electrode (4-2) and the negative electrode (4-5).

3. The gap phase change heat-structure integrated battery pack according to claim 1, characterized in that, The opening of the working fluid chamber (2-1) faces upward, and the opening of the core chamber (2-2) faces downward; the opening on the working fluid chamber (2-1) is connected to the condensation plate (3), so that the working fluid chamber (2-1) is sealed; and the opening on the core chamber (2-2) is connected to the core cover plate (4-3), so that the core chamber (2-2) is sealed.

4. The gap phase change heat - structure integrated battery pack according to claim 1, wherein The core body (4-1) is manufactured by winding or lamination technology.

5. The gap phase change heat - structure integrated battery pack according to claim 1, characterized in that, The side walls and top surface of the core cavity (2-2) are adjacent to the working fluid cavity (2-1), and there is a gap between the side walls of adjacent core cavities (2-2), clamping the working fluid cavity (2-1) in between to form a vertical gap interlayer, and a horizontal gap interlayer is formed between the top surface of the core cavity (2-2) and the bottom surface of the condensation plate (3), and the vertical gap interlayer and the horizontal gap interlayer are interconnected as a whole to form the working fluid cavity (2-1).

6. The gap phase change heat-structure integrated battery pack according to claim 5, wherein The surroundings and top surface of the core cavity (2-2) are flooded with liquid working medium.

7. The gap phase change heat-structure integrated battery pack according to claim 6, characterized in that, During operation, the heat generated by the charging and discharging of the core (4-1) is transferred through the wall of the heat-structure (2) to the gas-liquid phase change working medium in the working medium chamber (2-1). The gas-liquid phase change working medium undergoes a boiling phase change after being heated, and the heat is taken away by the latent heat absorbed when the liquid is converted into the gas state. The generated steam rises and converges to the top of the working medium chamber (2-1) and the lower surface of the condensation plate (3), and then the steam is condensed back into the liquid state and drips back into the liquid pool below.

8. The gap phase change heat - structure integrated battery pack according to claim 1, characterized in that The core assembly (4) is invertedly distributed.

9. The gap phase change heat-structure integrated battery pack according to claim 1, wherein The lower surface of the condensation plate (3) is provided with a concave-convex structure or a fin structure.

10. The gap phase change heat-structure integrated battery pack according to claim 1, wherein Reinforcing ribs (2-3) are arranged in the working fluid cavity (2-1), and the reinforcing ribs (2-3) adopt a prismatic structure.

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