DESC:FIELD OF THE INVENTION The present disclosure relates to a battery pack for thermal management. More particularly, the invention relates to a novel battery pack structure for an effective and efficient thermal management. BACKGROUND OF THE INVENTION The advancement of electronic devices has led to a surge in demand for secondary batteries. Among these, lithium secondary batteries stand out for their high energy density, operating voltage, and durability, making them prevalent in various electronic products, including mobile devices. Secondary batteries are typically categorized into cylindrical, prismatic, and pouch-shaped types based on their external and internal structures. Prismatic and pouch-shaped batteries, in particular, are gaining attention for their compact design and high integration capabilities. Moreover, secondary batteries are gaining traction as power sources for electric and hybrid vehicles, addressing concerns about air pollution from conventional fossil fuel vehicles. Consequently, the range of applications for secondary batteries is expanding, with expectations for further diversification in the future. Lithium-ion batteries exhibit superior properties compared to other secondary type batteries, such as high specific energy, high power density, low self-discharge, lightweight, safe and durable. All these characteristics of LIB are function of operational temperature. As the variety of applications grows, so does the need for batteries capable of meeting diverse power and capacity requirements. Various parameters like temperature, C-rate, heat transfer coefficient, and design of the battery thermal management system can influence thermal behaviour, which decides temperature uniformity and heat generation in a battery pack. Therefore, it is essential to have a proper battery thermal management system that can provide safe and desired conditions for a long and healthy life of the battery. The general
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function of BTMS is to keep battery temperature in the range of 25 – 40° C and temperature difference from cell to cell to be less than 5°C. For effective BTMS, the design of BTMS plays a critical role, which decides the thermal behaviour of a battery pack [“Thermal analysis and pack level design of battery thermal management system with liquid cooling for electric vehicles,” Energy Convers. Manag., vol. 196, no. February, pp. 105–116, 2019]. A study has been performed to evaluate the proposed BTMS's effectiveness by comparing its thermal performance with the regular battery pack structure without the thermal management system. Thus, with the growing popularity of EVs due to environmental concerns, there is a pressing need for an effective and efficient battery thermal management system. OBJECT OF THE INVENTION The main object of the present disclosure is to provide an effective and efficient thermal management system for battery. Another object of the present disclosure is to provide an effective battery thermal management system to maintain a lower maximum cell temperature in a battery pack. Yet another object of the present disclosure is to provide an effective battery thermal management system to maintain minimum temperature difference in a battery pack. SUMMARY OF THE INVENTION The present invention relates to a novel battery pack for effective thermal management. The primary aspect of the present disclosure is to provide a novel battery pack for thermal management comprising at least a first and second cooling unit comprising at least one coolant channel and one or more thermal pad, a plurality of heat carrier plate, a plurality of battery cell, a plurality of battery cell and a plurality of insulation foam, wherein the heat carrier plate, battery cell and insulation foam sequentially stacked between first and second cooling unit. Another aspect of the present disclosure provides the structure of the battery pack is such that the heat carrier plates, battery cells, and insulation foam are sequentially stacked between the
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first and second cooling units. This arrangement ensures effective thermal insulation and cushioning of the battery cells. Yet another aspect of the present disclosure provides the battery pack structure that ensures optimal thermal management by effectively dissipating heat and providing necessary insulation and cushioning for the battery cells during operation. BRIEF DESCRIPTION OF THE DRAWINGS Embodiments are illustrated by way of example and are not limited in the accompanying figures. FIG. 1 illustrates an explosive view of battery pack. FIG. 2 illustrates a battery pack assembly with coolant channel. FIG. 3A illustrates a comparison of proposed structure results with the battery pack without thermal system at 5 C-rate with ambient temperature of 308K (35o C). FIG. 3B illustrates a comparison of proposed structure results with the battery pack without thermal system at 9 C-rate with ambient temperature of 318K (45o C). Skilled artisans appreciate that elements in the figures are illustrated for simplicity and clarity and have not necessarily been drawn to scale. DETAILED DESCRIPTION OF THE INVENTION Thus, the present disclosure relates to a battery pack structure that provides an effective battery thermal management system to maintain a lower maximum cell temperature and lower the maximum temperature difference in a battery pack. The present disclosure provides a novel battery pack for thermal management. Said battery pack comprising at least a first and second cooling unit comprising at least one coolant channel and one or more thermal pad, a plurality of heat carrier plate (HCP), a plurality of battery cell, a plurality of battery cell and a plurality of insulation foam, wherein the heat carrier plate, battery cell and insulation foam sequentially stacked between first and second cooling unit.
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In every embodiment of the present disclosure, the said battery pack structure is provided with all the components mentioned in the explosive view diagram given in Fig. 1. Referring to Fig.1, it can be observed that battery cells (2) are in contact with the heat carrier plate (1) which is responsible for conducting heat from the cell to the thermal pad (4) in contact at its sides. The thermal pad acts as thermal contact between HCP and coolant channel (5) and helps to dissipate due to high conductivity. The heat from the thermal pad is carried away by the coolant channel. This arrangement ensures proper heat dissipation and maintains temperature in the desired range during operation. Further insulation foam (3) is placed between heat carried and battery cell which serves dual purpose i.e. providing thermal barrier from cell to cell and providing cushioning effect to cells during vibration and expansion of cell during charging and discharging. Referring to Fig. 2, it shows the assembled battery pack structure with the coolant channel. In one embodiment of the present disclosure, the said coolant channel comprising coolant is selected from the group consisting of air, liquid coolant or combination thereof. In one embodiment of the present disclosure, the said coolant channel having at least one coolant inlet and at least one coolant outlet. In one embodiment of the present disclosure, the said insulation foam is made of a material is selected from the group comprising silicone, polyurethane or any other polymer material. In one embodiment of the present disclosure, the thickness of the insulation foam is ranging between 0.5 and 30 mm. In one embodiment of the present disclosure, the density of the insulation foam is ranging between 100 and 400 kg/m3. In one embodiment of the present disclosure, the said thermal pad is made of a material comprising silicone and/or ceramic filler.
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In one embodiment of the present disclosure, the thickness of the thermal pad is ranging between 0.1 and 15 mm. In one embodiment of the present disclosure, the usage temperature of the thermal pad is ranging from -40 to 150°C. In one embodiment of the present disclosure, the thermal conductivity of the thermal pad is ranging from 1 to 5 W/mK. EXAMPLES The comparison is made with a regular battery pack without a thermal management system at a high C-rate condition. Example 1
Table 1. Comparison of proposed structure with regular battery pack Case Condition Proposed Regular Battery pack without thermal system ????????, ?? ??????????, ?? ????????, ?? ??????????, ?? 1 5C, T_amb = 298 K 320.7 1.9 322.8 4.6 2 9C, T_amb = 298 K 336.4 3.8 341.7 9.0 A study was performed to evaluate the performance of the proposed battery thermal management system (BTMS) compared to regular or battery packs without a thermal management system. Fig.3 shows the variation of maximum temperature with time for the proposed battery pack and battery pack without a thermal management system. The study is performed for both battery packs at 5C and 9C. At 5C rate and ambient temperature of 308K, it can be observed in Fig. 3(A) that maximum temperature at the end of discharging with proposed BTMS is 320.7 K while with regular battery pack is 322.8 K. Similarly, at 9C rate and ambient temperature of 318K, it can be observed in Fig. 3(B) that maximum temperature at the end of discharging with proposed BTMS is 336.4 K while with
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regular battery pack is 341.7 K. It can be concluded from Fig. 3(A) and 3(B), that proposed BTMS design is effective in maintaining lower maximum temperature compared to regular. Further comparison of maximum temperature from cell to cell can be made based on the data provided in Table 1, which shows that the proposed BTMS design is able to maintain a lower maximum temperature difference compared to regular battery pack structure. The heat carrier plate (HCP) used in this novel design of BTMS is different in design than that of the existing designs and provides enhanced heat transfer area from both sides of a single heat carrier plate stacked adjacent to each battery cell. The present design can be used in conjunction with air/liquid/ PCM coolant present in the cooling channel, which can be used for various applications such as 2W, 3W, and 4W, depending on the heat dissipation rate required. ,CLAIMS:We Claim, 1. A battery pack for thermal management, comprising: (i) first and second cooling unit comprising at least one coolant channel (5) and one or more thermal pad (4); (ii) a plurality of heat carrier plate (1); (iii) a plurality of battery cell (2); and
(iv) a plurality of battery cell Insulation foam (3), wherein the heat carrier plate, battery cell and insulation foam sequentially stacked between first and second cooling unit to provide thermal insulation and cushioning.
2. The battery pack as claimed in claim 1, wherein the coolant channel comprises a coolant selected from the group consisting of air, liquid coolant, or combination thereof.
3. The battery pack as claimed in claim 1, wherein the coolant channel includes at least one coolant inlet and at least one coolant outlet.
4. The battery pack as claimed in claim 1, wherein the insulation foam is made from a material selected from the group consisting of silicone or polyurethane.
5. The battery pack as claimed in claim 1, wherein the thickness of the insulation foam ranges from 0.5 mm to 30 mm.
6. The battery pack as claimed in claim 1, wherein the density of the insulation foam ranges from 100 kg/m³ to 400 kg/m³.
7. The battery pack as claimed in claim 1, wherein the thermal pad is made from a material comprising silicone and/or ceramic filler.
8. The battery pack as claimed in claim 1, wherein the thickness of the thermal pad ranges from 0.1 mm to 15 mm.
9. The battery pack as claimed in claim 1, wherein the usage temperature of the thermal pad ranges from -40°C to 150°C.
10. The battery pack as claimed in claim 1, wherein the thermal conductivity of the thermal pad ranges from 1 W/mK to 5 W/mK.
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