[0010] The present invention will be further explained below in conjunction with the drawings:
[0011] The battery pack with temperature adjustment function provided according to the present invention, such as figure 1 with figure 2 As shown, the present invention includes a battery pack 1 and a battery pack shell 3; wherein a layer of phase change material 2 is filled between the battery pack 1 and the battery pack shell 3, and the phase change temperature of the phase change material 2 is 0-60 Between ℃, it is in direct contact with the battery pack 1. The phase change material 2 is used to adjust the temperature of the battery pack, and control the temperature of the battery pack at 0-60° C. or a narrower range. The battery pack casing 3 is used to seal the phase change material 2 to prevent the phase change material 2 from leaking. The phase change material 2 is in direct contact with the surface of the battery pack 1, so that the limited surface area of the battery pack 1 can be fully utilized, heat transfer is better completed, and the purpose of controlling the temperature of the battery pack is achieved.
[0012] According to the battery pack with temperature adjustment function provided by the present invention, the phase change material 2 therein will release or absorb a large amount of latent heat during the process of changing from liquid to solid or from solid to liquid. The phase change material 2 actually serves as a kind of energy storage to control the temperature of the battery pack.
[0013] When the battery pack is working in a high temperature environment, or in the case of rapid charging, due to the large current, the temperature rises quickly, and heat is transferred from the battery pack 1 to the phase change material 2 in contact with it, the phase change material 2 Absorb heat and the temperature rises. When the temperature reaches the phase change temperature of the phase change material 2, the phase change material 2 begins to undergo a constant temperature change from solid to liquid (that is, the temperature of the phase change material does not increase with the accumulation of heat. This property is well known to those skilled in the art), so that the temperature of the battery pack 1 will not rise very high, which not only improves the working efficiency of the battery pack, but also ensures the service life of the battery pack.
[0014] When the temperature of the battery pack 1 (part of the battery absorbs heat when discharged) or the battery pack housing 3 (the battery enters a low-temperature environment) decreases, heat is transferred from the phase change material 2 to the battery pack 1 or the battery pack housing 3, and the phase change material 2 The temperature decreases, and when the temperature decreases to the phase change temperature of the phase change material 2, the phase change material 2 undergoes a phase change reaction. When the phase change material 2 changes from liquid to solid, it releases heat to the battery pack 1 and the battery pack shell 3 to compensate for the temperature drop of the battery pack 1 due to various factors, ensuring that the battery pack can work at normal temperature , Extending the service life of the battery pack.
[0015] The phase change material 2 is an organic phase change material and an inorganic phase change material. The phase change material 2 can be selected according to the battery pack's use environment or the temperature requirements of the battery pack. Usually, mineral wax with a phase change temperature below 60°C is selected. Polyethylene glycol with an average molecular weight of 500-8000 (e.g. PEG1000, PEG1500, PEG4000, PEG6000), neopentyl glycol (NPG), stearyl alcohol, 2-amino-2-methyl-1,3 propanediol and cyclohexane One or more of the alkane, wherein the phase transition temperature of the various phase change materials 2 is as follows:
[0016] Material name Phase transition temperature
[0017] PEG1000 33-38℃;
[0018] PEG1500 41-46℃;
[0019] PEG4000 50-54℃;
[0020] PEG6000 53-58℃;
[0021] Neopentyl glycol (NPG) 44℃;
[0022] Stearyl alcohol 57℃;
[0023] 2-amino-2-methyl-1,3 propanediol 57°C;
[0024] Cyclohexane 5-6°C.
[0025] According to the battery pack with temperature adjustment function provided by the present invention, the amount of phase change material 2 filled in the battery pack is based on the volume of the gap between the battery pack 1 and the battery pack shell 3 in the battery pack and the phase change material 2 selected The volume change before and after the reaction is determined by factors such as the volume change, and the volume of the phase change material 2 under normal pressure is just enough to fill the gap between the battery pack 1 and the battery pack shell 3. Too little (can't completely immerse the battery pack), it will not achieve the purpose of effectively adjusting the temperature, and even cause the battery cells in the battery pack 1 to have differences due to uneven temperature, affecting the operation of multiple battery cells in the battery pack The consistency of the time, thereby damaging the service life of the battery pack; too much, it will cause difficulty in production, and may also generate pressure in the battery pack, reducing the safety performance of the battery pack. Generally, when the amount of phase change material 2 is in a liquid state, its volume is 50-100% of the volume of the gap between the battery pack 2 and the battery pack shell 3, preferably 80-100%.
[0026] The battery pack casing 3 is a sealed casing, and its function is mainly to insulate and prevent the leakage of the phase change material 2, and its shape can be any shape according to the use environment and requirements. The material of the battery pack shell 3 can be any existing battery pack shell material.
[0027] The battery pack with temperature adjustment function has an opening 4 on the battery pack shell 3. After the battery pack 1 is fixed in the battery pack shell 3, the phase change material 2 is injected through the opening 4 In the battery pack casing 3, the opening 4 is sealed again, and any existing method can be used to seal the opening 4 of the battery pack casing 3, such as by welding, bolting or bonding.
