Battery pack with phase change material

Abstract

The utility model provides a battery pack with a phase-change material, which comprises an accommodating frame, a phase-change material, a phase-change material and a phase-change material, the plurality of batteries are arranged at intervals along the longitudinal direction of the accommodating frame; the plurality of first isolation plates are arranged in the accommodating space at intervals; wherein the first isolation plate is arranged between any two adjacent batteries, and the first isolation plate is made of a shaped composite phase change material, so that the phase change temperature of the first isolation plate is 24-30 DEG C, and the latent heat of phase change is 160-200kJ / kg. Excess heat is absorbed through the first isolation plate and released when needed, the heat is effectively transmitted to the external environment, and it is ensured that the whole battery pack is maintained within the optimal working temperature range. Therefore, accurate control of the temperature of the battery is realized, and the performance and the safety of the battery are remarkably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage, in particular to a battery pack with phase change material. Background Art

[0002] With the rapid development of new energy technologies, battery energy storage technology has received more and more attention. Batteries generate heat during the charging and discharging process, and the accumulation of heat will cause the battery temperature to rise sharply. At present, multiple battery cells are connected in series and parallel to form a battery pack. The relatively tight structural arrangement will cause it to generate heat during the charging and discharging process and it will be difficult to dissipate. Excessive battery temperature not only affects the battery's charging and discharging performance, but also causes thermal runaway of the battery, leading to combustion or even explosion. Utility Model Content

[0003] The utility model aims to provide a battery pack with phase change material to solve the problems of poor heat dissipation performance and low safety in the prior art.

[0004] In order to solve the above technical problems, the utility model provides a battery pack with phase change material, comprising:

[0005] The receiving frame has an open top and a receiving space inside;

[0006] A plurality of batteries are arranged at intervals along the longitudinal direction of the accommodating frame;

[0007] A plurality of first isolation plates are arranged at intervals in the accommodating space;

[0008] Among them, a first isolation plate is arranged between any two adjacent batteries, and the first isolation plate includes a first heat dissipation part made of a shaped composite phase change material, the phase change temperature of the first heat dissipation part is 24-30°C, and the phase change latent heat is 160-200kJ / kg.

[0009] In one embodiment, the thickness of the first isolation plate is 5 to 15 mm; and / or,

[0010] The first isolation plate includes a first outer cover wrapped around the outer periphery of the first heat dissipation portion, the first outer cover is insulating, and the first outer cover can conduct heat.

[0011] In one embodiment, the accommodating frame includes a bottom plate, two end stoppers and two side stoppers, the two end stoppers are arranged at opposite ends of the bottom plate, the two side stoppers are arranged at opposite sides of the bottom plate, the side stoppers connect the two end stoppers, and the bottom plate, the two end stoppers and the two side stoppers enclose to form the accommodating space;

[0012] The bottom plate includes a heat sink and a second isolation plate located on the heat sink. The second isolation plate includes a second heat sink made of a shaped composite phase change material. The phase change temperature of the second heat sink is 24-30°C, and the phase change latent heat is 160-200 kJ / kg.

[0013] In one embodiment, the thickness of the second isolation plate is 1 to 15 mm; and / or,

[0014] The second isolation plate includes a second outer cover wrapped around the outer periphery of the second heat dissipation portion, the second outer cover is insulating, and the second outer cover can conduct heat.

[0015] In one embodiment, the heat sink is made of aluminum;

[0016] The material of the end limiter is steel; the material of the side limiter is steel.

[0017] In one embodiment, the end limit member includes an end plate, a connecting plate and a mounting plate arranged on the outside of the end plate, the mounting plate is arranged on the outside of the upper part of the end plate, the mounting plate is used to install the insulator, the end plate has side flanges folded outward on both sides except for the place where the connecting plate is arranged, the connecting plate is used to connect with the side limit member, and the top and bottom of the end plate have upper flanges and lower flanges folded outward.

[0018] In one embodiment, the end stopper further includes a handle disposed on the outer side of the end plate;

[0019] There are two connecting plates, and the two connecting plates are arranged vertically at intervals, and the handle is connected to the two connecting plates.

[0020] In one embodiment, the side stopper includes at least one side beam;

[0021] The side beam includes a side plate and folded edges arranged at both ends of the side plate, the two folded edges respectively correspond to two end limiters, and the folded edges are located on the outer side of the connecting plate of the end limiter and connected to the connecting plate.

[0022] In one embodiment, the side limiter includes two side beams vertically spaced apart, the spacing between the two side beams is 40 mm to 70 mm, the height of the side beam is 20 to 50 mm, and the spacing between the lower side beam and the bottom plate is 30 to 40 mm.

[0023] In one embodiment, the end stopper includes an end plate and a connecting plate arranged outside the end plate, and the connecting plate is arranged in a one-to-one correspondence with the side beam.

[0024] In one embodiment, the heat dissipation plate includes a support plate and baffles arranged on both sides of the support plate, the baffles are perpendicular to the support plate, and both upper and lower ends of the baffles exceed the support plate, and the second isolation plate is arranged between the two baffles;

[0025] An air cooling channel or a liquid cooling channel is provided below the support plate.

[0026] It can be seen from the above technical solution that the advantages and positive effects of the utility model are:

[0027] In the design of the entire battery pack in the utility model, a comprehensive thermal management system is formed by using a shaped composite phase change material between two adjacent batteries for thermal management, combined with the support of the container frame. The design of the above system fully considers the heat generation and transfer characteristics of the battery during the charging and discharging process. The first isolation plate absorbs excess heat and releases it when needed, effectively transferring the heat to the external environment to ensure that the battery pack as a whole is maintained within the optimal operating temperature range. Therefore, precise control of the battery temperature is achieved, significantly improving the performance and safety of the battery.

[0028] Furthermore, by designing the bottom plate as a heat sink and a second isolation plate made of a shaped composite phase change material, the efficiency and uniformity of heat transfer to the external environment are improved. That is, active and passive thermal management is performed by using shaped composite phase change materials at key locations. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of one embodiment of a battery pack with phase change material in the utility model.

[0030] Figure 2 It is a structural schematic diagram of the heat dissipation plate in the utility model.

[0031] Figure 3 It is a structural schematic diagram of the end limiter in the utility model.

[0032] Figure 4 It is a structural schematic diagram of the side beam in the utility model.

[0033] The following are the descriptions of the reference numerals:

[0034] 100. Battery pack; 1. Bottom plate; 11. Heat sink; 111. Support plate; 112. Baffle; 12. Second isolation plate; 2. End stopper; 21. End plate; 211. Side flange; 212. Upper flange; 213. Lower flange; 22. Connecting plate; 23. Mounting plate; 24. Handle; 31. Side beam; 311. Side plate; 312. Folded edge; 4. Battery; 5. First isolation plate. DETAILED DESCRIPTION

[0035] Although the present invention can be easily embodied as embodiments of different forms, only some of the specific embodiments are shown in the drawings and described in detail in this specification. It should be understood that this description should be regarded as an exemplary description of the principles of the present invention and is not intended to limit the present invention to that described herein.

[0036] Thus, a feature indicated in this specification will be used to illustrate one of the features of an embodiment of the utility model, rather than implying that each embodiment of the utility model must have the described feature. In addition, it should be noted that this specification describes many features. Although some features can be combined together to illustrate possible system designs, these features can also be used in other combinations that are not explicitly described. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0037] In the embodiments shown in the drawings, the indications of directions (such as up, down, left, right, front and back) used to explain the structure and movement of various elements of the utility model are not absolute but relative. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, the indications of these directions also change accordingly.

[0038] The utility model provides a battery pack with phase change material (hereinafter referred to as battery pack), which manages heat conduction between batteries by utilizing the characteristics of phase change material absorbing and releasing a large amount of heat energy during phase change, effectively alleviating the problem of heat accumulation caused by the increase of battery operating temperature, thereby preventing battery overheating and improving the safety and stability of the battery pack.

[0039] Figure 1 The schematic diagram of the structure of the battery pack in this embodiment is shown. Figure 1 The battery pack 100 includes a accommodating frame, a plurality of batteries 4 and a plurality of first isolation plates 5. The top of the accommodating frame is open, and there is an accommodating space inside. A plurality of batteries 4 are arranged at intervals along the longitudinal direction of the accommodating frame. A plurality of first isolation plates 5 are arranged at intervals in the accommodating space. Among them, a first isolation plate 5 is arranged between any two adjacent batteries 4. The first isolation plate 5 includes a first heat dissipation portion made of a shaped composite phase change material, the phase change temperature of the first heat dissipation portion is 24 to 30°C, and the phase change latent heat is 160 to 200 kJ / kg.

[0040] Battery 4 is a lithium battery, and its optimal operating temperature is 20-40°C. The phase change temperature of the first heat dissipation part is 24-30°C, that is, the phase change temperature of the first heat dissipation part is within the optimal operating temperature of battery 4, which is beneficial to the heat dissipation part absorbing heat from battery 4. The phase change latent heat of the first heat dissipation part is high, specifically 160-200 kJ / kg. The first heat dissipation part has a low degree of supercooling and a high thermal conductivity, which further ensures that the battery pack 100 as a whole is maintained within the optimal operating temperature range and improves safety.

[0041] Specifically, the shaped composite phase change material is composed of the following raw materials in weight percentage: 34% to 43% calcium chloride, 6% to 14% calcium nitrate, 4% to 7% bentonite, 4% to 6% kaolin, 0.5% to 2% expanded graphite, 0.8% to 2% zinc chloride, 0.8% to 2% sodium chloride, 0.8% to 3% potassium chloride, 0.5% to 1.5% sodium acetate, 1.5% to 2.5% urea and 29.7% to 36% water.

[0042] Furthermore, the mass percentage of calcium chloride is 42.5%, the mass percentage of calcium nitrate is 6.5%, the mass percentage of bentonite is 5.5%, the mass percentage of kaolin is 4.8%, the mass percentage of expanded graphite is 0.8%, the mass percentage of zinc chloride is 0.9%, the mass percentage of sodium chloride is 0.95%, the mass percentage of potassium chloride is 1.3%, the mass percentage of sodium acetate is 1.1%, the mass percentage of urea is 1.65% and the mass percentage of water is 34%.

[0043] Salt substances such as calcium chloride in the shaped composite phase change material can combine with water to form hydrated salt crystals; the four water molecules of calcium chloride hexahydrate are hydrated in the first hydration layer of calcium ions, and the other two water molecules are hydrated in the second hydration layer by forming hydrogen bonds with the inner layer water molecules. The four water molecules of calcium nitrate tetrahydrate are all in the first hydration layer of calcium ions, and hydrogen bonds are formed between the hydrated water molecules. Calcium chloride hexahydrate crystals and calcium nitrate tetrahydrate crystals have the advantages of high energy storage density and small phase change volume change. The melting points of calcium chloride hexahydrate crystals and calcium nitrate tetrahydrate crystals are low, which can control the phase change temperature of the phase change material at around 25°C. However, the mixture of calcium chloride and calcium nitrate hydrate salt crystals still has the problems of high supercooling and severe phase separation.

[0044] Bentonite and kaolin have natural nanosheet structures, which can adsorb hydrated salt crystals such as calcium chloride and reduce the possibility of phase change leakage of hydrated salt crystals; at the same time, due to the binding effect of the nanospace and the rich hydroxyl groups on the surfaces of bentonite and kaolin, there is a high intermolecular force between the hydrated salt crystals and bentonite and kaolin. Even if the phase change temperature increases slightly, the phase change temperature range becomes wider and the phase separation problem is improved.

[0045] The phase change temperature of zinc chloride hydrate crystals is low. When used together with urea as a temperature regulating material, it can reduce the problem of increased phase change temperature caused by the addition of organic materials such as bentonite, kaolin, and sodium acetate. The phase change latent heat of sodium chloride hydrate, potassium chloride hydrate, and sodium acetate hydrate is high, which can increase the overall phase change latent heat of the composite phase change material.

[0046] Expanded graphite has a porous structure. Expanded graphite is used to coat the hydrated salt for the second time. On the one hand, it can further reduce the possibility of crystallization leakage of the hydrated salt. At the same time, it can also reduce the possibility of bound water turning into free water through hydrogen bonding, thereby improving the phase separation of the phase change material. On the other hand, expanded graphite has high thermal conductivity and can quickly transfer heat, thereby making the phase change of the phase change material uniform, thus overcoming the problem of uneven heat transfer of inorganic phase change materials. At the same time, expanded graphite, bentonite and kaolin are insoluble in water, thus providing heterogeneous nucleation for the molten hydrated salt mixture, thereby facilitating the occurrence of the crystallization process and reducing the degree of supercooling.

[0047] In summary, the overall phase change temperature of the phase change material can be controlled at 24-30°C, the phase change latent heat reaches 160-200 kJ / kg, the supercooling is low, and the thermal conductivity is high; the phase change process is reversible, the process is simple, and it can be mass-produced. The manufactured phase change material is non-toxic and non-flammable, has high energy storage density, small size, constant temperature control, significant energy-saving effect, wide range of phase change temperature selection, and easy control.

[0048] Furthermore, the thickness of the first isolation plate 5 is 5 to 15 mm.

[0049] The first isolation plate 5 includes a first outer cover wrapped around the outer periphery of the first heat dissipation portion. The first outer cover is insulated. The first outer cover can conduct heat. In this embodiment, the first outer cover is made of a heat-conducting and insulating material. Exemplarily, the material of the first outer cover can be any one of polyurethane, silicone, polyvinyl chloride (PVC), acrylonitrile-butadiene-styrene copolymer (ABS) and polycarbonate (PC).

[0050] The first outer cover can prevent the shaped composite phase change material from decomposing or attenuating in performance during long-term use. The first outer cover can also ensure that the volume expansion of the shaped composite phase change material during the phase change process can be safely accommodated to prevent leakage. At the same time, the first outer cover is insulated to meet the insulation level requirements.

[0051] Continue reading Figure 1 The accommodating frame includes a bottom plate 1, two end limit members 2 and two side limit members. The two end limit members 2 are arranged at opposite ends of the bottom plate 1, and the two side limit members are arranged at opposite sides of the bottom plate 1. The side limit members connect the two end limit members 2. The bottom plate 1, the two end limit members 2 and the two side limit members enclose a accommodating space.

[0052] The base plate 1 includes a heat dissipation plate 11 and a second isolation plate 12 located on the heat dissipation plate 11 .

[0053] The second isolation plate 12 includes a second heat dissipation part made of a shaped composite phase change material, wherein the phase change temperature of the second heat dissipation part is 24-30° C., and the phase change latent heat is 160-200 kJ / kg.

[0054] The thickness of the second isolation plate 12 is 1 to 15 mm.

[0055] The second isolation plate 12 includes a second outer cover wrapped around the outer periphery of the second heat dissipation portion. The second outer cover is insulated and can conduct heat.

[0056] The structure of the second isolation plate 12 is similar to that of the first isolation plate 5 , and the details may refer to the description of the first isolation plate 5 .

[0057] Figure 2 The schematic diagram of the structure of the heat sink 11 is shown. Figure 2 The heat sink 11 includes a support plate 111 and baffles 112 arranged on both sides of the support plate 111. The baffles 112 are perpendicular to the support plate 111, and both upper and lower ends of the baffles 112 exceed the support plate 111. That is, the cross section of the heat sink 11 is I-shaped.

[0058] The heat sink 11 is made of aluminum, which makes full use of the thermal conductivity of the aluminum material to dissipate heat to the environment.

[0059] The second isolation plate 12 is disposed between the two baffles 112 .

[0060] An air cooling channel or a liquid cooling channel is provided below the support plate 111 , and the air cooling channel or the liquid cooling channel is located between the two baffles 112 .

[0061] The second isolation plate 12 is used in combination with the heat sink 11, and the heat generated by the battery 4 can be absorbed by the second isolation plate 12 and then transferred to the heat sink 11, and then the heat sink 11 effectively dissipates the heat to the environment, further improving the efficiency of heat dissipation and reducing the overall operating temperature of the battery pack 100.

[0062] In other embodiments, the bottom plate 1 may only include the heat sink 11. In this case, the heat generated by the battery 4 is dissipated to the environment through the heat sink 11.

[0063] Furthermore, a heat sink is provided below the support plate 111. With the aid of the heat sink, the efficiency of heat dissipation is further improved.

[0064] Figure 3 The schematic diagram of the structure of the end stopper 2 is shown. Figure 3 The end limit piece 2 includes an end plate 21, a connecting plate 22 and a mounting plate 23 arranged on the outside of the end plate 21. The mounting plate 23 is arranged on the outside of the upper part of the end plate 21. The mounting plate 23 is used to install the insulator. The end plate 21 has side flanges 211 folded outward on both sides except where the connecting plate 22 is arranged. The connecting plate 22 is used to connect with the side limit piece. The top and bottom of the end plate 21 have end flanges 312 folded outward.

[0065] Specifically, the end plate 21 has side flanges 211 folded outward on both sides except where the connecting plate 22 is provided, and the top and bottom of the end plate 21 have upper flanges 212 and lower flanges 213 folded outward. The inside and outside are based on the use state of the accommodating frame, and the inside is facing the inside of the accommodating frame, and the opposite is outside.

[0066] In this embodiment, the end plate 21 includes a vertically extending plate body which is disposed at the end of the bottom plate 1 .

[0067] The upper flange 212 is located at the top of the plate body. Specifically, the upper flange 212 is formed by folding and extending the top of the plate body outward.

[0068] The lower flange 213 is located at the bottom of the plate body. Specifically, the lower flange 213 is formed by folding and extending the bottom end of the plate body outward.

[0069] The side flange 211 is located at the side of the plate body. Specifically, the side flange 211 is formed by folding and extending the side of the plate body outward.

[0070] In this embodiment, the side flange 211 includes a plurality of side folding parts arranged at intervals along the vertical direction. The area corresponding to the intervals between the adjacent side folding parts is used to set the connecting plate 22, and the connecting plate 22 is used to connect with the side limiter, that is, the side limiter is connected with the connecting plate 22 through the interval. Specifically, the number of the side folding parts is three. Adaptively, there are two connecting plates 22. In other embodiments, it can also be set according to actual needs.

[0071] The mounting plate 23 is located at the upper part of the end. Specifically, the mounting plate 23 is located below the upper flange 212 and is closely connected to the upper flange 212. In this embodiment, the mounting plate 23 includes a plate body and a bending portion arranged at the top and bottom of the plate body. The plate body is parallel to the plate body of the end plate 21, and the bending portion located at the top of the plate body is closely connected to the upper flange 212. The mounting plate 23 is used to install the insulator.

[0072] The two connecting plates 22 are arranged at intervals in the vertical direction. Of the two connecting plates 22, the upper connecting plate 22 is fitted to the lower side of the mounting plate 23. Specifically, the connecting plate 22 is a box-shaped structure with an opening, and the opening of the connecting plate 22 faces the plate body. In this embodiment, the connecting plate 22 includes a plate body and side walls arranged on the circumference of the plate body, the upper side wall is fitted and connected to the bent portion of the mounting plate 23, and the side walls on both sides are in contact with the side flanges 211.

[0073] The end stopper 2 further includes a handle 24 disposed outside the end plate 21. Specifically, the handle 24 is connected to the two connecting plates 22.

[0074] The end stopper 2 is made of steel. Therefore, the end stopper 2 has good mechanical strength and thermal stability, and can withstand the physical impact and thermal stress that the battery pack 100 may encounter during use, and maintain the structural stability of the battery pack 100.

[0075] The side limiter includes at least one side beam 31. The number of the side beam 31 can be one, which is arranged in the middle of the end limiter 2. The number of the side beams 31 can also be two, three or other numbers, which are specifically arranged according to actual conditions. In this embodiment, the number of the side beams 31 is two. The side beams 31 and the connecting plates 22 are arranged one by one. That is, the side limiter includes two side beams 31, and the end limiter 2 includes two connecting plates 22.

[0076] Figure 4 The schematic diagram of the structure of the side beam 31 is shown. Figure 4 The side beam 31 includes a side plate 311 and folded edges 312 arranged at both ends of the side plate 311. Specifically, the side beam 31 is U-shaped.

[0077] The two folded edges 312 correspond to the two end stoppers 2 respectively. The folded edges 312 are located outside the connecting plate 22 of the end stoppers 2 and are connected to the connecting plate 22. That is, the folded edges 312 are located outside the connecting plate 22, and the two are connected in a close fit. Through the above-mentioned connection method between the side beam 31 and the end stoppers 2, the distance between the two end stoppers is limited, and the connection strength is improved.

[0078] The side limiter includes two side beams 31 arranged at intervals in the vertical direction. The interval between the two side beams 31 is 40 mm to 70 mm. The interval between the two side beams 31 refers to the vertical distance between the bottom of the upper side beam 31 and the top of the lower side beam 31.

[0079] The height of the side beam 31 is 20-50 mm. The height of the side beam 31 is the vertical dimension of the side beam 31 when the accommodating rack is in use.

[0080] The interval between the side beam 31 located below and the bottom plate 1 is 30 to 40 mm. The interval here refers to the vertical distance between the bottom of the side beam 31 located below and the top of the bottom plate 1.

[0081] In this embodiment, there are two side beams 31 , and the spacing between the side beams 31 and the height of the side beams 31 ensure that the side limiters have sufficient strength and that there is more heat dissipation space on the sides.

[0082] Furthermore, the side limiter is made of steel, so the side limiter has good mechanical strength and thermal stability, protecting the battery 4 from lateral impact.

[0083] The battery pack in this embodiment has the following advantages:

[0084] In the design of the entire battery pack, a comprehensive thermal management system is formed by using shaped composite phase change materials for thermal management and combining them with the support of the container frame. The design of the system fully considers the heat generation and transfer characteristics of the battery during the charging and discharging process. The shaped composite phase change material absorbs excess heat and releases it when needed, effectively transferring the heat to the external environment to ensure that the battery pack as a whole is maintained within the optimal operating temperature range.

[0085] Furthermore, by designing the bottom plate as a heat sink and a second isolation plate made of a shaped composite phase change material, the efficiency and uniformity of heat transfer to the external environment are improved. That is, active and passive thermal management is performed by using shaped composite phase change materials at key locations.

[0086] Through the above design, precise control of battery temperature is achieved, which significantly improves battery performance and safety. While ensuring cost-effectiveness and minimizing environmental impact, the long-term stability of the battery pack system is ensured. By optimizing the thermal management system, the temperature consistency between batteries has been significantly improved. At the same time, this strategy also improves the efficiency of the entire battery pack, providing support for the long-term stable operation of the battery by reducing energy loss and improving battery performance.

[0087] Although the utility model has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the utility model can be implemented in a variety of forms without departing from the spirit or essence of the utility model, it should be understood that the above-mentioned embodiments are not limited to any of the aforementioned details, but should be widely interpreted within the spirit and scope defined by the attached claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the attached claims.

Claims

1. A battery pack having a phase change material, characterized in that: include: The receiving frame has an open top and a receiving space inside; A plurality of batteries are arranged at intervals along the longitudinal direction of the accommodating frame; A plurality of first isolation plates are arranged at intervals in the accommodating space; Among them, a first isolation plate is arranged between any two adjacent batteries, and the first isolation plate includes a first heat dissipation part made of a shaped composite phase change material, the phase change temperature of the first heat dissipation part is 24-30°C, and the phase change latent heat is 160-200kJ / kg.

2. The battery pack with phase change material according to claim 1, characterized in that: The thickness of the first isolation plate is 5 to 15 mm; and / or, The first isolation plate includes a first outer cover wrapped around the outer periphery of the first heat dissipation portion, the first outer cover is insulating, and the first outer cover can conduct heat.

3. The battery pack with phase change material according to claim 1, characterized in that: The accommodating frame includes a bottom plate, two end stoppers and two side stoppers, the two end stoppers are arranged at opposite ends of the bottom plate, the two side stoppers are arranged at opposite sides of the bottom plate, the side stoppers connect the two end stoppers, and the bottom plate, the two end stoppers and the two side stoppers enclose the accommodating space; The bottom plate includes a heat sink and a second isolation plate located on the heat sink. The second isolation plate includes a second heat sink made of a shaped composite phase change material. The phase change temperature of the second heat sink is 24-30°C, and the phase change latent heat is 160-200 kJ / kg.

4. The battery pack with phase change material according to claim 3, characterized in that: The thickness of the second isolation plate is 1 to 15 mm; and / or, The second isolation plate includes a second outer cover wrapped around the outer periphery of the second heat dissipation portion, the second outer cover is insulating, and the second outer cover can conduct heat.

5. The battery pack with phase change material according to claim 3, characterized in that: The heat sink is made of aluminum; The material of the end limiter is steel; the material of the side limiter is steel.

6. The battery pack with phase change material according to claim 3, characterized in that: The end limit piece includes an end plate, a connecting plate and a mounting plate arranged on the outside of the end plate. The mounting plate is arranged on the outside of the upper part of the end plate. The mounting plate is used to install an insulator. The end plate has side flanges folded outward on both sides except for the place where the connecting plate is arranged. The connecting plate is used to connect with the side limit piece. The top and bottom of the end plate have upper and lower flanges folded outward.

7. The battery pack with phase change material according to claim 6, characterized in that: The end stopper also includes a handle disposed on the outer side of the end plate; There are two connecting plates, and the two connecting plates are arranged vertically at intervals, and the handle is connected to the two connecting plates.

8. The battery pack with phase change material according to claim 3, characterized in that: The side stopper includes at least one side beam; The side beam includes a side plate and folded edges arranged at both ends of the side plate, the two folded edges respectively correspond to two end limiters, and the folded edges are located on the outer side of the connecting plate of the end limiter and connected to the connecting plate.

9. The battery pack with phase change material according to claim 8, characterized in that: The side limiter comprises two side beams arranged at intervals along the vertical direction, the interval between the two side beams is 40 mm to 70 mm, the height of the side beam is 20 to 50 mm, and the interval between the side beam at the bottom and the bottom plate is 30 to 40 mm.

10. The battery pack with phase change material according to claim 9, characterized in that: The end stopper includes an end plate and a connecting plate arranged outside the end plate, and the connecting plate is arranged in a one-to-one correspondence with the side beam.

11. The battery pack with phase change material according to claim 3, characterized in that: The heat dissipation plate includes a support plate and baffles arranged on both sides of the support plate, the baffles are perpendicular to the support plate, and the upper and lower ends of the baffles are both higher than the support plate, and the second isolation plate is arranged between the two baffles; An air cooling channel or a liquid cooling channel is provided below the support plate.

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