Battery pack with phase change material

Abstract

The invention provides a battery pack with a phase-change material, which comprises: an accommodating frame, the top of which is open and the interior of which is provided with an accommodating space; 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] This invention relates to the field of energy storage technology, and in particular to a battery pack with phase change material. Background Technology

[0002] With the rapid development of new energy technologies, battery energy storage technology has received increasing attention. Batteries generate heat during charging and discharging, and the accumulation of this heat can cause a sharp rise in battery temperature. Currently, multiple battery cells are connected in series and parallel to form battery packs. This relatively compact arrangement makes it difficult to dissipate the heat generated during charging and discharging. Excessive battery temperature not only affects the battery's charging and discharging performance but can also trigger thermal runaway, leading to combustion or even explosion. Summary of the Invention

[0003] The purpose of this invention is to provide a battery pack with phase change material to solve the problems of poor heat dissipation and low safety in the prior art.

[0004] To solve the above-mentioned technical problems, the present invention provides a battery pack with a phase change material, comprising:

[0005] A storage rack with an open top and internal storage space;

[0006] Multiple batteries are arranged at longitudinal intervals along the receiving frame;

[0007] Multiple first isolation plates are spaced apart within the accommodating space;

[0008] Among them, a first isolation plate is provided between any two adjacent batteries. 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 latent heat of phase change is 160-200kJ / kg.

[0009] The shaped composite phase change material is composed of the following raw materials in weight percentages: calcium chloride 34%–43%, calcium nitrate 6%–14%, bentonite 4%–7%, kaolin 4%–6%, expanded graphite 0.5%–2%, zinc chloride 0.8%–2%, sodium chloride 0.8%–2%, potassium chloride 0.8%–3%, sodium acetate 0.5%–1.5%, urea 1.5%–2.5%, and water 29.7%–36%.

[0010] In one embodiment, the thickness of the first partition plate is 5–15 mm; and / or,

[0011] The first isolation plate includes a first outer cover that wraps around the outer periphery of the first heat dissipation part. The first outer cover is insulating and thermally conductive.

[0012] In one embodiment, the accommodating frame includes a base plate, two end limiting members, and two side limiting members. The two end limiting members are arranged at opposite ends of the base plate, and the two side limiting members are arranged on opposite sides of the base plate. The side limiting members connect the two end limiting members, and the base plate, the two end limiting members, and the two side limiting members enclose the accommodating space.

[0013] The base plate includes a heat sink and a second isolation plate located on the heat sink. The second isolation plate includes a second heat dissipation part made of a shaped composite phase change material. The phase change temperature of the second heat dissipation part is 24-30℃, and the latent heat of phase change is 160-200kJ / kg.

[0014] In one embodiment, the thickness of the second partition plate is 1–15 mm; and / or,

[0015] The second isolation plate includes a second outer cover that wraps around the outer periphery of the second heat dissipation part. The second outer cover is insulating and thermally conductive.

[0016] In one embodiment, the heat sink is made of aluminum;

[0017] The end limiting member is made of steel; the side limiting member is made of steel.

[0018] In one embodiment, the end limiting member includes an end plate, a connecting plate disposed on the outside of the end plate, and a mounting plate. The mounting plate is disposed on the outer side of the upper part of the end plate and is used to install an insulator. The end plate has side flanges folded outward on both sides except where the connecting plate is disposed. The connecting plate is used to connect with the side limiting member. The top and bottom of the end plate have upper flanges and lower flanges folded outward.

[0019] In one embodiment, the end limiting member further includes a handle disposed on the outside of the end plate;

[0020] There are two connecting plates, and the two connecting plates are arranged vertically at intervals. The handle is connected to the two connecting plates.

[0021] In one embodiment, the side limiting member includes at least one side beam;

[0022] The side beam includes a side plate and folded edges arranged at both ends of the side plate. The two folded edges correspond to the two end limiting members respectively. The folded edges are located outside the connecting plate of the end limiting members and are connected to the connecting plate.

[0023] In one embodiment, the side limiting member includes two side beams arranged vertically at intervals, the interval between the two side beams being 40mm to 70mm, the height of the side beams being 20mm to 50mm, and the interval between the lower side beam and the base plate being 30mm to 40mm.

[0024] In one embodiment, the end limiting member includes an end plate and a connecting plate disposed on the outside of the end plate, wherein the connecting plate is disposed in a one-to-one correspondence with the side beam.

[0025] In one embodiment, the heat sink includes a support plate and baffles arranged on both sides of the support plate. The baffles are perpendicular to the support plate, and both the upper and lower ends of the baffles extend beyond the support plate. The second isolation plate is disposed between the two baffles.

[0026] The support plate is provided with an air-cooled channel or a liquid-cooled channel below it.

[0027] As can be seen from the above technical solution, the advantages and positive effects of the present invention are as follows:

[0028] In the design of the entire battery pack in this invention, a comprehensive thermal management system is formed by using a shaped composite phase change material between adjacent batteries for thermal management, combined with the support of the housing frame. The design of this system fully considers the heat generation and transfer characteristics of the battery during charging and discharging. Excess heat is absorbed by the first separator and released when needed, effectively transferring heat to the external environment and ensuring that the entire battery pack is maintained within its optimal operating temperature range. Therefore, precise control of battery temperature is achieved, significantly improving battery performance and safety.

[0029] Furthermore, by designing the base plate as a heat dissipation plate and a second insulating plate made of 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 achieved by using shaped composite phase change material in key locations. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of one embodiment of the battery pack with phase change material in this invention.

[0031] Figure 2 This is a schematic diagram of the heat sink structure in this invention.

[0032] Figure 3 This is a schematic diagram of the end-positioning device in this invention.

[0033] Figure 4 This is a schematic diagram of the side beam structure in this invention.

[0034] The annotations in the attached figures are explained as follows:

[0035] 100. Battery pack; 1. Base plate; 11. Heat sink plate; 111. Support plate; 112. Baffle; 12. Second isolation plate; 2. End limiting component; 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 Implementation

[0036] Although the invention can be readily embodied in various forms, only some specific embodiments are shown in the accompanying drawings and will be described in detail in this specification. It is understood that this specification should be regarded as an exemplary illustration of the principles of the invention and is not intended to limit the invention to what is described herein.

[0037] Therefore, a feature pointed out in this specification is used to illustrate one feature of one embodiment of the invention, and does not imply that every embodiment of the invention must have the described feature. Furthermore, it should be noted that this specification describes many features. While certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0038] In the embodiments shown in the accompanying drawings, the directional indications (such as up, down, left, right, front, and back) used to explain the structure and movement of the various elements of the invention are relative rather than absolute. 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, these directional indications also change accordingly.

[0039] This invention provides a battery pack with phase change material (hereinafter referred to as battery pack), which manages the heat conduction between batteries by utilizing the characteristic of phase change material to absorb and release a large amount of heat energy during phase change, effectively alleviating the problem of heat accumulation caused by the rise in battery operating temperature, thereby preventing battery overheating and improving the safety and stability of the battery pack.

[0040] Figure 1 A schematic diagram of the battery pack in this embodiment is shown. (See attached diagram.) Figure 1 The battery pack 100 includes a housing frame, multiple batteries 4, and multiple first separator plates 5. The housing frame has an open top and an internal housing space. The multiple batteries 4 are arranged longitudinally and at intervals along the housing frame. The multiple first separator plates 5 are arranged at intervals within the housing space. A first separator plate 5 is disposed between any two adjacent batteries 4. The first separator plate 5 includes a first heat dissipation part made of a shaped composite phase change material, the phase change temperature of the first heat dissipation part being 24–30°C, and the latent heat of phase change being 160–200 kJ / kg.

[0041] Battery 4 is a lithium battery, with an optimal operating temperature of 20–40°C. The phase transition temperature of the first heat dissipation unit is 24–30°C, meaning it falls within the optimal operating temperature range of battery 4, facilitating heat absorption by the heat dissipation unit. The first heat dissipation unit has a high latent heat of phase transition, specifically 160–200 kJ / kg. Its low supercooling and high thermal conductivity further ensure that the entire battery pack 100 remains within its optimal operating temperature range, enhancing safety.

[0042] Specifically, the shaped composite phase change material is composed of the following raw materials in weight percentages: calcium chloride 34%–43%, calcium nitrate 6%–14%, bentonite 4%–7%, kaolin 4%–6%, expanded graphite 0.5%–2%, zinc chloride 0.8%–2%, sodium chloride 0.8%–2%, potassium chloride 0.8%–3%, sodium acetate 0.5%–1.5%, urea 1.5%–2.5%, and water 29.7%–36%.

[0043] Furthermore, the composition by mass percentage is as follows: calcium chloride 42.5%, calcium nitrate 6.5%, bentonite 5.5%, kaolin 4.8%, expanded graphite 0.8%, zinc chloride 0.9%, sodium chloride 0.95%, potassium chloride 1.3%, sodium acetate 1.1%, urea 1.65%, and water 34%.

[0044] In shaped composite phase change materials, calcium chloride and other salts can combine with water to form hydrated salt crystals. In hexahydrate calcium chloride, four water molecules are hydrated in the first hydration layer of calcium ions, while the other two water molecules are hydrated in the second hydration layer through hydrogen bonds with inner water molecules. In tetrahydrate calcium nitrate, all four water molecules are in the first hydration layer of calcium ions, with hydrogen bonds forming between the hydrated water molecules. Hexahydrate and tetrahydrate calcium nitrate crystals have advantages such as high energy density and small phase change volume. Their low melting points allow the phase change temperature of the phase change material to be controlled around 25°C. However, mixtures of calcium chloride and calcium nitrate hydrate crystals still suffer from high supercooling and severe phase separation.

[0045] Bentonite and kaolin have natural nanosheet structures that can adsorb hydrated salt crystals such as calcium chloride, reducing the possibility of leakage during the phase transition of hydrated salt crystals. At the same time, due to the binding effect of the nanospace and the fact that the surface of bentonite and kaolin is rich in hydroxyl groups, there is a high intermolecular force between hydrated salt crystals and bentonite and kaolin. Even if the phase transition temperature increases slightly, the phase transition temperature range becomes wider, and the problem of phase separation is improved.

[0046] Hydrated zinc chloride crystals have a low phase change temperature. When used together with urea as a temperature-regulating material, they can reduce the increase in phase change temperature caused by the addition of organic materials such as bentonite, kaolin, and sodium acetate. Hydrated sodium chloride, hydrated potassium chloride, and hydrated sodium acetate have high latent heats of phase change, which can improve the overall latent heat of phase change of the composite phase change material.

[0047] Expanded graphite has a porous structure, and its secondary coating of hydrated salts further reduces the possibility of crystallization leakage. Simultaneously, it reduces the likelihood of bound water becoming free water through hydrogen bonding, improving phase separation in phase change materials. Furthermore, expanded graphite's high thermal conductivity enables rapid heat transfer, resulting in uniform phase transformation and overcoming the problem of uneven heat transfer in inorganic phase change materials. Additionally, the insolubility of expanded graphite, bentonite, and kaolin in water provides a heterogeneous nucleation environment for the molten hydrated salt mixture, promoting crystallization and reducing supercooling.

[0048] In summary, the overall phase change temperature of the phase change material can be controlled between 24 and 30°C, the latent heat of phase change reaches 160 to 200 kJ / kg, the supercooling is low, and the thermal conductivity is high. The phase change process is reversible, the process is simple, it can be mass-produced, and the resulting phase change material is non-toxic, non-flammable, has high energy storage density, small size, constant temperature control, significant energy-saving effect, wide range of phase change temperature selection, and is easy to control.

[0049] Furthermore, the thickness of the first isolation plate 5 is 5-15 mm.

[0050] The first isolation plate 5 includes a first outer cover surrounding the first heat dissipation portion. The first outer cover is insulating. The first outer cover is thermally conductive. In this embodiment, the first outer cover is made of a thermally conductive and insulating material. For example, the material of the first outer cover may be any one of polyurethane, silicone, polyvinyl chloride (PVC), acrylonitrile-styrene-butadiene copolymer (ABS), and polycarbonate (PC).

[0051] The first outer casing prevents the shaped composite phase change material from decomposing or degrading during long-term use. It also ensures that the volume expansion during the phase change process of the shaped composite phase change material is safely contained, preventing leakage. Furthermore, the first outer casing is insulated and meets insulation class requirements.

[0052] Continue reading Figure 1 The accommodating frame includes a base plate 1, two end limiting members 2 and two side limiting members. The two end limiting members 2 are located at opposite ends of the base plate 1, and the two side limiting members are located on opposite sides of the base plate 1. The side limiting members are connected to the two end limiting members 2. The base plate 1, the two end limiting members 2 and the two side limiting members enclose and form an accommodating space.

[0053] The base plate 1 includes a heat sink 11 and a second isolation plate 12 located on the heat sink 11.

[0054] The second isolation plate 12 includes a second heat dissipation section made of a shaped composite phase change material. The phase change temperature of the second heat dissipation section is 24-30℃, and the latent heat of phase change is 160-200kJ / kg.

[0055] The thickness of the second isolation plate 12 is 1 to 15 mm.

[0056] The second isolation plate 12 includes a second outer cover that wraps around the outer periphery of the second heat dissipation section. The second outer cover is insulating. The second outer cover is thermally conductive.

[0057] The structure of the second isolation plate 12 is similar to that of the first isolation plate 5, and the specific details can be found in the description of the first isolation plate 5.

[0058] Figure 2 A schematic diagram of the heat sink 11 is shown below. 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 the upper and lower ends of the baffles 112 extend beyond the support plate 111. That is, the heat sink 11 has an I-shaped cross-section.

[0059] The heat sink 11 is made of aluminum. It makes full use of the thermal conductivity of aluminum to dissipate heat into the environment.

[0060] The second isolation plate 12 is disposed between the two baffles 112.

[0061] An air-cooled channel or a liquid-cooled channel is provided below the support plate 111. The air-cooled channel or liquid-cooled channel is located between the two baffles 112.

[0062] The second separator 12 is used in conjunction with the heat sink 11. The heat generated by the battery 4 is absorbed by the second separator 12 and then transferred to the heat sink 11, which then effectively dissipates the heat into the environment. This further improves the heat dissipation efficiency and reduces the overall operating temperature of the battery pack 100.

[0063] In other embodiments, the base plate 1 may consist only of a heat sink 11. In this case, the heat generated by the battery 4 is dissipated into the environment through the heat sink 11.

[0064] Furthermore, a heat sink is also provided below the support plate 111. With the assistance of the heat sink, the heat dissipation efficiency is further improved.

[0065] Figure 3 A schematic diagram of the end limiting member 2 is shown. (See attached diagram) Figure 3The end limiting member 2 includes an end plate 21, a connecting plate 22 disposed on the outside of the end plate 21, and a mounting plate 23. The mounting plate 23 is disposed on the outer side of the upper part of the end plate 21 and is used to install an insulator. The end plate 21 has side flanges 211 folded outward on both sides except where the connecting plate 22 is disposed. The connecting plate 22 is used to connect with the side limiting member. The top and bottom of the end plate 21 have end flanges 312 folded outward.

[0066] Specifically, the end plate 21 has side flanges 211 folded outward on both sides except for the area where the connecting plate 22 is installed, and the top and bottom of the end plate 21 have upper flanges 212 and lower flanges 213 folded outward. Here, "inner" and "outer" are used with reference to the usage state of the accommodating frame, with the side facing inward towards the accommodating frame being the inner side, and the opposite being the outer side.

[0067] In this embodiment, the end plate 21 includes a vertically extending plate. This plate is disposed at the end of the base plate 1.

[0068] The upper flange 212 is located at the top of the board. Specifically, the upper flange 212 is formed by folding outward from the top of the board.

[0069] The lower flange 213 is located at the bottom of the board. Specifically, the lower flange 213 is formed by folding outward from the bottom end of the board.

[0070] The side flange 211 is located on the side of the board. Specifically, the side flange 211 is formed by folding outward from the side of the board.

[0071] In this embodiment, the side flange 211 includes a plurality of side folds spaced vertically. The area corresponding to the interval between adjacent side folds is used to mount a connecting plate 22, which connects to the side limiting member; that is, the side limiting member is connected to the connecting plate 22 through this interval. Specifically, there are three side folds. Alternatively, there are two connecting plates 22. In other embodiments, the number can be adjusted according to actual needs.

[0072] Mounting plate 23 is located at the upper part of the end. Specifically, mounting plate 23 is located below the upper flange 212 and is fitted and connected to the upper flange 212. In this embodiment, mounting plate 23 includes a plate body and bent portions located at the top and bottom of the plate body. The plate body is parallel to the end plate 21, and the bent portion located at the top of the plate body is fitted and connected to the upper flange 212. Mounting plate 23 is used to mount insulators.

[0073] Two connecting plates 22 are arranged vertically at intervals. Of the two connecting plates 22, the upper connecting plate 22 is attached to the lower part of the mounting plate 23. Specifically, the connecting plate 22 has 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 around the plate body. The upper side wall is attached to the bent part of the mounting plate 23, and the side walls on both sides abut against the side flanges 211.

[0074] The end limiting member 2 also includes a handle 24 disposed on the outside of the end plate 21. Specifically, the handle 24 is connected to the two connecting plates 22.

[0075] The end limiting member 2 is made of steel. Therefore, the end limiting member 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, thus maintaining the structural stability of the battery pack 100.

[0076] The side limiting member includes at least one side beam 31. There can be one side beam 31, located in the middle of the end limiting member 2. The number of side beams 31 can also be two, three, or other numbers, depending on the specific circumstances. In this embodiment, there are two side beams 31. Each side beam 31 corresponds to one of the connecting plates 22. That is, the side limiting member includes two side beams 31, and the end limiting member 2 includes two connecting plates 22.

[0077] Figure 4 A structural schematic diagram of the side beam 31 is shown. (See attached diagram.) Figure 4 The side beam 31 includes a side plate 311 and flanges 312 arranged at both ends of the side plate 311. Specifically, the side beam 31 is U-shaped.

[0078] The two folded edges 312 correspond to the two end limiting members 2 respectively. The folded edges 312 are located on the outside of the connecting plate 22 of the end limiting member 2 and are connected to the connecting plate 22. That is, the folded edges 312 are located on the outside of the connecting plate 22, and the two are closely connected. Through the above-mentioned connection method between the side beam 31 and the end limiting member 2, the distance between the two end limiting members is limited, and the connection strength is improved.

[0079] The side limiting member includes two side beams 31 arranged vertically at intervals. The interval between the two side beams 31 is 40mm to 70mm. 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.

[0080] The height of the side beam 31 is 20-50mm. The height of the side beam 31 is the vertical dimension of the side beam 31 when it is in use with the rack.

[0081] The gap between the lower side beam 31 and the base plate 1 is 30-40mm. Here, the gap refers to the vertical distance between the bottom of the lower side beam 31 and the top of the base plate 1.

[0082] In this embodiment, there are two side beams 31. The spacing between the two side beams 31 and the height of the side beams 31 themselves ensure that the side limiting member has sufficient strength and has more heat dissipation space on the side.

[0083] Furthermore, the side limiting component is made of steel. Therefore, the side limiting component has good mechanical strength and thermal stability, protecting battery 4 from lateral impacts.

[0084] The battery pack in this embodiment has the following advantages:

[0085] In the overall design of the battery pack, thermal management is achieved through the use of shaped composite phase change materials, combined with the support of the housing frame, forming a comprehensive thermal management system. The system design fully considers the heat generation and transfer characteristics of the battery during charging and discharging. By using shaped composite phase change materials to absorb excess heat and release it when needed, the heat is effectively transferred to the external environment, ensuring that the battery pack as a whole is maintained within the optimal operating temperature range.

[0086] Furthermore, by designing the base plate as a heat dissipation plate and a second insulating plate made of 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 achieved by using shaped composite phase change material in key locations.

[0087] The above design achieves precise control of battery temperature, significantly improving battery performance and safety. It ensures long-term stability of the battery pack system while maintaining cost-effectiveness and minimizing environmental impact. Optimized thermal management systems significantly improve temperature consistency between batteries. Furthermore, this strategy enhances the overall efficiency of the battery pack, supporting long-term stable operation by reducing energy loss and improving battery performance.

[0088] Although the invention has been described with reference to several typical embodiments, it should be understood that the terminology used is illustrative and exemplary, and not restrictive. Since the invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A battery pack with a phase change material, characterized in that, include: A storage rack with an open top and internal storage space; Multiple batteries are arranged at longitudinal intervals along the receiving frame; Multiple first isolation plates are spaced apart within the accommodating space; Among them, a first isolation plate is provided between any two adjacent batteries. 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 latent heat of phase change is 160-200kJ / kg. The shaped composite phase change material is composed of the following raw materials in weight percentages: calcium chloride 34%–43%, calcium nitrate 6%–14%, bentonite 4%–7%, kaolin 4%–6%, expanded graphite 0.5%–2%, zinc chloride 0.8%–2%, sodium chloride 0.8%–2%, potassium chloride 0.8%–3%, sodium acetate 0.5%–1.5%, urea 1.5%–2.5%, and water 29.7%–36%.

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

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

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

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

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

7. The battery pack with phase change material according to claim 6, characterized in that, The end limiting member also includes a handle disposed on the outside of the end plate; There are two connecting plates, and the two connecting plates are arranged vertically at intervals. 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 limiting member 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 correspond to the two end limiting members respectively. The folded edges are located outside the connecting plate of the end limiting members and are connected to the connecting plate.

9. The battery pack with phase change material according to claim 8, characterized in that, The side limiting member includes two side beams arranged vertically at intervals, with a spacing of 40mm to 70mm between the two side beams, a height of 20 to 50mm for the side beams, and a spacing of 30 to 40mm between the lower side beam and the base plate.

10. The battery pack with phase change material according to claim 9, characterized in that, The end limiting member includes an end plate and a connecting plate disposed on the outside of the end plate, and the connecting plate is disposed 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 sink includes a support plate and baffles arranged on both sides of the support plate. The baffles are perpendicular to the support plate, and both the upper and lower ends of the baffles extend beyond the support plate. The second isolation plate is disposed between the two baffles. The support plate is provided with an air-cooled channel or a liquid-cooled channel below it.

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