Battery heat dissipation structure and battery
Through the combined structure of the thermally conductive connection layer and the phase change connection layer, the problem of thermal runaway at high temperatures of lithium-ion batteries is solved, and rapid heat dissipation and safety improvement are achieved.
Patent Information
- Application Number
- CN202421761420.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-24
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-07-24
AI Technical Summary
Existing lithium-ion batteries are prone to thermal runaway at high temperatures, resulting in safety and stability problems.
The combined structure of a thermally conductive connection layer and a phase change connection layer is adopted. The thermally conductive connection layer is in communication with the storage cavity, quickly absorbing heat and releasing gas and heat through the phase change connection layer to prevent heat from being out of control.
Effectively reduce the internal temperature of the battery, improve safety and stability, prevent thermal runaway, and enhance thermal conductivity and heat dissipation effect.
Smart Images
Figure CN223066262U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of batteries, and particularly relates to a battery heat dissipation structure and a battery. Background Art
[0002] Nowadays, lithium-ion batteries are widely used in power, consumer, and energy storage fields due to their advantages such as high energy density, high charging efficiency, excellent cycling performance, and large output power. With the continuous progress of technology, the energy density of lithium-ion batteries is getting higher and higher, and the problem of battery safety is becoming increasingly prominent, especially for lithium batteries doped with silicon.
[0003] When the internal temperature of the housing of most existing lithium batteries doped with silicon is too high, the side reactions of the battery increase, the gas generation rate increases rapidly, and at the same time, the heat accumulation cannot be released in time. This method is prone to thermal runaway, resulting in fire or explosion, thus reducing the safety and stability of use. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a battery heat dissipation structure aiming at the deficiencies of the existing technology, which can solve the technical problems of low safety and stability in use mentioned above.
[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:
[0006] A battery heat dissipation structure, comprising:
[0007] A housing, a storage cavity is arranged inside the housing; and a connection port communicating with the storage cavity is also arranged on the housing;
[0008] And a heat dissipation body; the heat dissipation body includes an assembly connection component, a heat conduction connection layer, and a phase change connection layer; the heat conduction connection layer and the phase change connection layer are stacked and connected to the assembly connection component; and the heat conduction connection layer communicates with the storage cavity; the assembly connection component is connected inside the connection port.
[0009] Preferably, at least one first groove is arranged on the surface of the heat conduction connection layer facing the storage cavity;
[0010] And / or, the connection port (11) is arranged at the top of the housing (1).
[0011] Preferably, the relationship between the depth L4 of the first groove and the thickness L2 of the heat conduction connection layer satisfies: L4 = A * L2, A = (1 / 4 to 1 / 3).
[0012] Preferably, at least one second groove is arranged on the surface of the heat conduction connection layer facing the phase change connection layer;
[0013] And the second groove and the first groove are oppositely arranged on two side surfaces of the heat conduction connection layer.
[0014] Preferably, the relational expression between the depth L3 of the second groove and the thickness L2 of the heat conduction connection layer satisfies: L3 = B * L2, where B = (1 / 4 - 1 / 3).
[0015] Preferably, the value of the thickness L1 of the phase change connection layer is: 0.2 mm ≤ L1 ≤ 1 mm; and / or, the value of the thickness L2 of the heat conduction connection layer is: L2 < 0.2 mm.
[0016] Preferably, a through hole is provided in the assembly connection component; the heat conduction connection layer and the phase change connection layer are stacked inside the through hole;
[0017] And a first installation groove communicating with the through hole is further provided in the assembly connection component; the heat conduction connection layer is connected to the inner wall of the first installation groove.
[0018] Preferably, the assembly connection component includes a first connection section, an intermediate connection section, and a second connection section that are sequentially stacked; a second installation groove is provided between the outer side walls of the first connection section, the outer side walls of the intermediate connection section, and the outer side walls of the second connection section; the housing is connected to the inside of the second installation groove.
[0019] Preferably, the heat conduction connection layer is a metal foil; and / or, the phase change connection layer is a solid-liquid phase change organic substance; and / or, the assembly connection component is a hot melt adhesive or a heat conduction gel.
[0020] The present utility model also discloses a battery, including the battery heat dissipation structure described above.
[0021] The beneficial effects of the present utility model are as follows. In this technical solution, the heat conduction connection layer directly communicating with the storage cavity can quickly absorb heat therein and play a role in dissipating heat to the phase change connection layer to a certain extent, so that the phase change connection layer is partially or completely melted and deforms itself; and when the internal air pressure is relatively large, the gas is more likely to break through the heat conduction connection layer and rush out of the phase change connection layer to release the gas and carry out heat, and at the same time, under the heat absorption effect of the phase change connection layer, the internal temperature is rapidly reduced to prevent thermal runaway from occurring, thereby improving the safety in use and effectively achieving the heat conduction and heat dissipation effect; in addition, through the assembly between the assembly connection component and the housing, the installation stability of the heat conduction connection layer and the phase change connection layer can be improved, and it is avoided that they fall into the storage cavity during low temperature or normal use, thus ensuring the stability in use. Description of the Drawings
[0022] The following will refer to the attached Figures 1 to 5To describe the features, advantages and technical effects of the exemplary embodiments of the present utility model.
[0023] Figure 1 A cross-sectional view of a battery heat dissipation structure according to an embodiment of the present utility model;
[0024] Figure 2 A schematic structural view of a heat dissipation body of a battery heat dissipation structure according to an embodiment of the present utility model;
[0025] Figure 3 A schematic structural view of a heat dissipation body of a battery heat dissipation structure according to an embodiment of the present utility model;
[0026] Figure 4 A schematic structural view of a connection layer of a battery heat dissipation structure according to an embodiment of the present utility model;
[0027] Figure 5 A schematic structural view of a battery according to an embodiment of the present utility model.
[0028] In the figure: 1 - housing; 11 - connection port; 101 - storage cavity; 2 - battery cell structure; 21 - first tab; 22 - second tab; 23 - battery cell body; 3 - heat dissipation body; 31 - assembly connection component; 311 - through hole; 312 - first installation groove; 313 - second installation groove; 301 - first connection section; 302 - intermediate connection section; 303 - second connection section; 32 - heat conduction connection layer; 321 - first groove; α - first included angle; 322 - second groove; β - second included angle; 33 - phase change connection layer. Detailed implementation manners
[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.
[0030] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, "a plurality of" means two or more unless otherwise specifically defined.
[0031] Reference to "embodiments" in this specification means that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0032] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, or there are multiple situations where A exists alone. In addition, the character " / " in this text generally indicates that the associated objects before and after are in an "or" relationship.
[0033] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "linkage", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.
[0034] The following is a further detailed description of the present utility model in conjunction with the attached Figures 1 to 5 drawings, but it does not limit the present utility model.
[0035] As Figure 1 shown, in an embodiment of the present utility model, the battery heat dissipation structure includes a housing 1 and a heat dissipation body 3. A storage cavity 101 is provided inside the housing 1. A connection port 11 communicating with the storage cavity 101 is further provided on the housing 1. The heat dissipation body 3 includes an assembly connection component 31, a heat conduction connection layer 32, and a phase change connection layer 33. The assembly connection component 31 is connected inside the connection port 11. The phase change connection layer 33 and the heat conduction connection layer 32 are respectively laminated on the assembly connection component 31 along the thickness direction of the assembly connection component 31. And the heat conduction connection layer 32 communicates with the storage cavity 101.
[0036] The technical solution of the present utility model can quickly absorb heat therein through a heat-conducting connection layer directly connected to the storage cavity, and plays a role in dissipating heat to the phase-change connection layer to a certain extent, so that the phase-change connection layer is partially or completely melted and causes its own deformation; and when the internal air pressure is relatively large, gas is more likely to break through the heat-conducting connection layer and rush out of the phase-change connection layer to release gas and carry out heat, and at the same time, under the heat absorption effect of the phase-change connection layer, the internal temperature is rapidly reduced to prevent thermal runaway from occurring, thereby improving the safety of use and effectively achieving the heat-conducting and heat-dissipating effect; in addition, through the assembly effect between the assembly connection component and the housing, the installation stability of the heat-conducting connection layer and the phase-change connection layer can be improved, and it is avoided that they fall into the storage cavity during low temperature or normal use, thus ensuring the stability of use.
[0037] Among them, in some embodiments, such as Figure 1 shown, the connection port 11 is arranged at the edge position of the top of the housing 1. This method can increase the size of the heat sink 3 without increasing the thickness of the battery, thereby effectively controlling the overall thickness of the battery. Since the top is more likely to be damaged under the impact of high-temperature gas, the connection port 11 on the top of the housing 1 can better discharge gas and improve the safety of use.
[0038] Specifically, in some embodiments, the heat-conducting connection layer 32 is a metal foil. When the heat-conducting connection layer 32 is a metal foil, it is preferably one or more alloys of aluminum, copper, iron, gold, and silver; further, the heat conductivity coefficient of the heat-conducting connection layer 32 > 200W / Mk. Since the heat-conducting effect of the metal foil is better, the guiding efficiency of the internal heat can be improved.
[0039] Specifically, in some embodiments, the phase-change connection layer 33 is a solid-liquid phase-change organic substance; preferably one or more of paraffin or composite phase-change materials (such as polyurethane). Further, the phase-change temperature of the phase-change connection layer 33 is 70-100°C, and the phase-change latent heat > 180K·J / Kg. That is to say, when the inside of the housing is in a low-temperature state, the phase-change connection layer 33 is in a solid state, and both the phase-change connection layer 33 and the metal foil have certain mechanical properties, thus ensuring the stability of its support installation and effectively preventing the phase-change connection layer 33 and the metal foil from being deformed by the extrusion of the internal gas of the battery; however, when the internal temperature is higher than 100°C, the solid-liquid phase-change organic substance absorbs heat and undergoes a solid-liquid transformation, losing its mechanical strength; at the same time, the metal foil is broken by the extrusion of the internal gas of the battery, and gas is released and heat is carried out; thus, the internal temperature of the battery is rapidly reduced by the solid-liquid phase-change organic substance to prevent thermal runaway from occurring.
[0040] Specifically, in some embodiments, such as Figure 2As shown, the relational expression between the thickness L1 of the phase change connection layer 33 and the thickness L2 of the heat conduction connection layer 32 satisfies: L2 < L1. Among them, in some embodiments, the value of L1 is 0.2 - 1 mm; L2 < 0.2 mm. This structure can ensure the stability of support through the relatively thin heat conduction connection layer 32, and at the same time ensure that when the internal pressure exceeds the safety pressure value and the internal temperature is too high, the gas can cause it to break; thus, the heat conduction connection layer 32 loses its mechanical strength and breaks, and can exhaust gas to release heat.
[0041] Specifically, in some embodiments, such as Figure 2 and 3 shown, at least one first groove 321 is provided on the surface of the heat conduction connection layer 32 facing the storage cavity 101; the first groove 321 is recessed in the direction from the heat conduction connection layer 32 towards the phase change connection layer 33. Among them, as Figure 3 shown, the relational expression between the depth L4 of the first groove 321 and the thickness L2 of the heat conduction connection layer 32 satisfies: L4 = A * L2, A = (1 / 4 - 1 / 3). This structure can achieve that when the internal pressure exceeds the safety pressure value (0.1 - 0.5 MPa) and the internal temperature (the normal value is lower than 80 - 90 °C) is too high, the gas can cause the heat conduction connection layer 32 to break; thus, the heat conduction connection layer 32 loses its mechanical strength and breaks, and can exhaust gas to release heat.
[0042] Among them, in some embodiments, such as Figure 3 shown, the cross-section of the first groove 321 can be a quadrilateral or a triangle, etc. When the cross-section of the first groove 321 is a triangle, the inclination angle α of the first groove 321 satisfies: 45° ≤ α ≤ 75°; preferably: 45°, 50°, 60°, 75°; more preferably 60°. This structure can achieve rapid breakage under a certain air pressure impact through a more appropriate groove angle.
[0043] Specifically, in some embodiments, such as Figure 2 and 3 shown, at least one second groove 322 is provided on the surface of the heat conduction connection layer 32 facing the phase change connection layer 33; the second groove 322 is recessed in the direction from the phase change connection layer 33 towards the heat conduction connection layer 32. Further, the second groove 322 and the first groove 321 are oppositely arranged on both surfaces of the heat conduction connection layer 32. Among them, as Figure 3As shown, the relationship between the depth L3 of the second groove 322 and the thickness L2 of the heat-conducting connection layer 32 satisfies: L3 = B * L2, where B = (1 / 4 to 1 / 3). This structure can enable the gas to further quickly cause the heat-conducting connection layer 32 to break when the internal pressure exceeds the safety pressure value (0.1 to 0.5 MPa) and the internal temperature (normally lower than 80 to 90 °C) is too high through the second groove 322 of a certain size; thus, the heat-conducting connection layer 32 loses its mechanical strength and breaks, and heat can be exhausted and released.
[0044] Among them, in some embodiments, as Figure 3 shown, the second groove 322 can be quadrilateral or triangular, etc. When the cross-section of the second groove 322 is triangular, the inclination angle β of the second groove 322 satisfies: 45° ≤ α ≤ 75°; preferably: 45°, 50°, 60°, 75°; more preferably 60°. This structure can achieve quick breakage under a certain air pressure impact through a more appropriate groove angle.
[0045] Specifically, in some embodiments, as Figure 1 and 2 shown, a through hole 311 is provided in the assembly connection component 31; the heat-conducting connection layer 32 and the phase-change connection layer 33 are stacked inside the through hole 311; and the phase-change connection layer 33 and the storage cavity 101 are oppositely arranged on both side ends of the heat-conducting connection layer 32. This structure can ensure the installation stability by stacking the heat-conducting connection layer 32 and the phase-change connection layer 33 inside the assembly connection component 31, and effectively shorten the heat transfer path, thereby improving the heat conduction and dissipation speed and ensuring the safety of use.
[0046] Specifically, in some embodiments, as Figure 3 and 4 shown, a first installation groove 312 communicating with the through hole 311 is further provided in the assembly connection component 31; the heat-conducting connection layer 32 abuts against the inner wall of the first installation groove 312; a second installation groove 313 is provided at the outer end of the assembly connection component 31; the housing 1 is connected inside the second installation groove 313. This structure can further improve the assembly stability of the heat-conducting connection layer 32 through the first installation groove 312; at the same time, the assembly stability of the heat sink 3 is improved through the second installation groove 313. Among them, as Figure 4 shown, the relationship between the thickness H1 of the first installation groove 312 and the thickness H2 of the second installation groove 313 satisfies: H1 < H2. This structure can further ensure the installation stability and ensure the safety of use through the second installation groove 313 with a larger size at the assembly end with the housing 1.
[0047] Specifically, in some embodiments, the assembly connection component 31 is hot melt adhesive or thermal conductive gel; wherein, the hot melt adhesive is specifically one or more composites of polypropylene, polyethylene, polyethylene terephthalate, and polyvinyl chloride; its melting point > 130 °C, and the heat dissipation valve and the housing 1 are hermetically connected by high-temperature hot pressing. Further, as Figure 4 shown, the assembly connection component 31 includes a first connection section 301, an intermediate connection section 302, and a second connection section 303 that are sequentially stacked; a through hole 311 is formed between the inner walls of the first connection section 301, the intermediate connection section 302, and the second connection section 303; a first installation groove 312 is provided between the inner walls of the first connection section 301 and the second connection section 303; a second installation groove 313 is formed between the outer walls of the first connection section 301, the intermediate connection section 302, and the second connection section 303. Still further, the first connection section 301, the intermediate connection section 302, and the second connection section 303 are all hollow annular structures; and the first connection section 301 is a T-shaped structure; the second connection section 303 is an inverted T-shaped structure.
[0048] The present utility model also proposes a battery, which includes a battery heat dissipation structure and a battery cell structure 2. The specific structure of the battery heat dissipation structure refers to the above embodiments. Since this battery adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, and will not be elaborated herein one by one.
[0049] Among them, as Figure 5 shown, the battery cell structure 2 further includes a battery cell body 23, a first pole ear 21, and a second pole ear 22 connected to the battery cell body 23; and the polarities of the first pole ear 21 and the second pole ear 22 are opposite; the battery cell body 23 is connected to the inside of the storage cavity 101. Further, the first pole ear 21 is a cathode ear, and the second pole ear 22 is an anode ear. Or, the first pole ear 21 is an anode ear, and the second pole ear 22 is a cathode ear.
[0050] Embodiment 1
[0051] Place the battery cell structure 2 in the storage cavity 101; make the silicon content in the anode plate of the battery cell structure 2 5%, and wind the anode and cathode plates and the separator into a bare battery cell; select a metal foil as the thermal conductive connection layer, and the thickness of the metal foil is 0.1 mm and the bursting pressure is 0.1 - 0.2 MPa; the phase change connection layer 33 selects paraffin with a solid-liquid phase change temperature of 80 - 90 °C. First, heat-seal the metal foil in the heat dissipation body 3 at the connection port 11 on the top of the housing 1, and then coat the phase change connection layer 33 of paraffin on the surface of the metal foil (realize the distribution operation to prevent the solid organic matter from melting during heat-sealing); then, perform encapsulation, liquid injection, formation, and secondary sealing according to the battery manufacturing process to obtain a finished product.
[0052] Example 2
[0053] The storage cavity 101 houses the discharge core structure 2; the anode plate in the core structure 2 is made with a silicon doping amount of 10%, and the anode and cathode plates and the separator are wound into a bare core; a metal foil is selected as the heat conduction connection layer, and the thickness of the metal foil is 0.1 mm and the bursting pressure is 0.1 - 0.2 MPa; the phase change connection layer 33 selects paraffin with a solid-liquid phase change temperature of 80 - 90 °C. First, the metal foil in the heat sink 3 is heat-sealed at the connection port 11 at the top of the housing 1, and then the phase change connection layer 33 of paraffin is coated on the surface of the metal foil (to achieve a distribution operation to prevent the solid organic matter from melting during heat sealing); then, subsequent packaging, liquid injection, formation, and secondary sealing are carried out according to the battery manufacturing process to obtain the finished product.
[0054] Example 3
[0055] The storage cavity 101 houses the discharge core structure 2; the anode plate in the core structure 2 is made with a silicon doping amount of 10%, and the anode and cathode plates and the separator are wound into a bare core; a metal foil is selected as the heat conduction connection layer, and the thickness of the metal foil is 0.1 mm and the bursting pressure is 0.1 - 0.2 MPa; the phase change connection layer 33 selects paraffin with a solid-liquid phase change temperature of 100 - 110 °C. First, the metal foil in the heat sink 3 is heat-sealed at the connection port 11 at the top of the housing 1, and then the phase change connection layer 33 of paraffin is coated on the surface of the metal foil (to achieve a distribution operation to prevent the solid organic matter from melting during heat sealing); then, subsequent packaging, liquid injection, formation, and secondary sealing are carried out according to the battery manufacturing process to obtain the finished product.
[0056] Example 4
[0057] The storage cavity 101 houses the discharge core structure 2; the anode plate in the core structure 2 is made with a silicon doping amount of 10%, and the anode and cathode plates and the separator are wound into a bare core; a metal foil is selected as the heat conduction connection layer, and the thickness of the metal foil is 0.1 mm and the bursting pressure is 0.1 - 0.2 MPa; the phase change connection layer 33 selects paraffin with a solid-liquid phase change temperature of 70 - 80 °C. First, the metal foil in the heat sink 3 is heat-sealed at the connection port 11 at the top of the housing 1, and then the phase change connection layer 33 of paraffin is coated on the surface of the metal foil (to achieve a distribution operation to prevent the solid organic matter from melting during heat sealing); then, subsequent packaging, liquid injection, formation, and secondary sealing are carried out according to the battery manufacturing process to obtain the finished product.
[0058] Example 5
[0059] Place the discharge core structure 2 inside the storage cavity 101; make the silicon content in the anode plate of the core structure 2 10%, wind the anode and cathode plates and the separator into a bare core; select a metal foil as the heat conduction connection layer, and the thickness of the metal foil is 0.1 mm and the bursting pressure is 0.4 - 0.5 MPa; the phase change connection layer 33 selects paraffin with a solid-liquid phase change temperature of 80 - 90 °C. First, heat-seal the metal foil in the heat sink 3 at the connection port 11 on the top of the housing 1, and then coat the phase change connection layer 33 of the paraffin on the surface of the metal foil (realize the distribution operation to prevent the melting of solid organic matter during heat-sealing); then, carry out encapsulation, liquid injection, formation, and secondary sealing according to the battery manufacturing process to obtain the finished product.
[0060] Comparative Example 1
[0061] The difference from Example 1 is that: the heat sink 3 is not installed on the housing 1, and the finished product is directly obtained by encapsulation, liquid injection, formation, and secondary sealing according to the battery manufacturing process.
[0062] Comparative Example 2
[0063] The difference from Example 2 is that: the heat sink 3 is not installed on the housing 1, and the finished product is directly obtained by encapsulation, liquid injection, formation, and secondary sealing according to the battery manufacturing process.
[0064] Performance test method:
[0065] Discharge the finished product at a constant current of 0.2C until 3V, set aside for 5 minutes, then charge at a constant current and constant voltage of 0.5C until 4.50V, with a cut-off rate of 0.02C, set aside for 5 minutes, and then place the core in a thermal shock box (suspension test), heat it by convection or circulating hot air at an initial temperature of 25 ± 3 °C, the oven temperature rises at a rate of 5 ± 2 °C / min to 132 ± 2 °C, and keep it for 60 minutes and then stop. Subsequently, carry out the 135 °C hot box test according to the same test method.
[0066] Therefore, from the above test steps and the data results in Table 1 below, it can be obtained that: the technical solution of this application By Adding the heat sink 3 and Setting The metal foil within a reasonable range can effectively improve the high-temperature heat dissipation of the battery, thereby improving the hot box performance.
[0067] Table 1
[0068]
[0069]
[0070] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
[0071] Based on the disclosure and teachings of the above specification, those skilled in the art to which the present utility model pertains can also make changes and modifications to the above embodiments. Therefore, the present utility model is not limited to the above specific embodiments, and any obvious improvements, substitutions, or variations made by those skilled in the art based on the present utility model fall within the protection scope of the present utility model. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present utility model.
Claims
1. A battery heat dissipation structure, characterized in that: Comprising: A housing (1), within which a storage cavity (101) is provided; and a connection port (11) communicating with the storage cavity (101) is further provided on the housing (1); And a heat dissipation body (3); the heat dissipation body (3) includes an assembly connection component (31), a heat conduction connection layer (32), and a phase change connection layer (33); the heat conduction connection layer (32) and the phase change connection layer (33) are respectively stacked and connected to the assembly connection component (31); and the heat conduction connection layer (32) communicates with the storage cavity (101); the assembly connection component (31) is connected within the connection port (11).
2. The battery heat dissipation structure according to claim 1, wherein: At least one first groove (321) is provided on a surface of the heat conduction connection layer (32) facing the storage cavity (101); And / or, the connection port (11) is provided at the top of the housing (1).
3. The battery heat dissipation structure according to claim 2, wherein: The relationship between the depth L4 of the first groove (321) and the thickness L2 of the heat conduction connection layer (32) satisfies: L4 = A * L2, where A = (1 / 4 to 1 / 3).
4. The battery heat dissipation structure according to claim 2 or 3, characterized in that: At least one second groove (322) is provided on a surface of the heat conduction connection layer (32) facing the phase change connection layer (33); And the second groove (322) and the first groove (321) are oppositely arranged on two side surfaces of the heat conduction connection layer (32).
5. The battery heat dissipation structure according to claim 4, wherein: The relationship between the depth L3 of the second groove (322) and the thickness L2 of the heat conduction connection layer (32) satisfies: L3 = B * L2, where B = (1 / 4 to 1 / 3).
6. The battery heat dissipation structure according to claim 1, wherein: The value of the thickness L1 of the phase change connection layer (33) is: 0.2 mm ≤ L1 ≤ 1 mm; And / or, the value of the thickness L2 of the heat conduction connection layer (32) is: L2 < 0.2 mm.
7. The battery heat dissipation structure according to claim 1, wherein: A through hole (311) is provided within the assembly connection component (31); the heat conduction connection layer (32) and the phase change connection layer (33) are stacked and arranged inside the through hole (311); And a first installation groove (312) communicating with the through hole (311) is further provided within the assembly connection component (31); the heat conduction connection layer (32) is connected to the inner wall of the first installation groove (312).
8. The battery heat dissipation structure according to claim 1 or 7, characterized in that: The assembly connection component (31) includes a first connection section (301), an intermediate connection section (302), and a second connection section (303) which are sequentially stacked; a second installation groove (313) is provided between the outer side walls of the first connection section (301), the intermediate connection section (302), and the second connection section (303); the housing (1) is connected within the second installation groove (313).
9. The battery heat dissipation structure according to claim 1, wherein: The heat conduction connection layer (32) is a metal foil; and / or, the phase change connection layer (33) is a solid-liquid phase change organic substance; and / or, the assembly connection component (31) is a hot melt adhesive or a heat conduction gel.
10. A battery, characterized in that: Including the battery heat dissipation structure according to any one of claims 1 to 9 above.