Battery pack cooling system and energy storage device

Abstract

The utility model provides a battery pack cooling system and an energy storage device, the battery pack cooling system comprises a liquid storage part, a pumping part and a liquid outlet part which are integrated in a battery pack, the liquid storage part is located at the bottom in the battery pack, an inlet of the pumping part is located in the liquid storage part, the liquid outlet part is connected to an outlet of the pumping part, and the liquid storage part is located in the liquid storage part. An outlet of the liquid outlet part is arranged corresponding to a to-be-cooled component in the battery pack, under the driving of the pumping part, the insulating cooling liquid in the liquid storage part can be conveyed to the position of the to-be-cooled component and cools the to-be-cooled component, and the cooled insulating cooling liquid can flow back into the liquid storage part. According to the battery pack cooling system disclosed by the utility model, through the liquid storage part integrated at the bottom of the battery pack and the liquid outlet part with the outlet corresponding to the to-be-cooled component, the cooling liquid can be conveyed to the position of the to-be-cooled component to cool the to-be-cooled component, and can flow back into the liquid storage part to be recycled; therefore, the cooling effect of the battery pack is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and in particular to a battery pack cooling system. The utility model also relates to an energy storage device provided with the battery pack cooling system. Background Art

[0002] With the development of modern electric vehicles and power tools, battery packs are increasingly used. However, battery packs generate a lot of heat when working. If the heat cannot be dissipated in time and effectively, the performance and service life of the battery pack will be affected. Therefore, how to effectively cool the battery pack has become an urgent problem to be solved.

[0003] Existing battery pack cooling technology generally uses pipes, liquid cooling plates and battery cells to fit together, which is prone to problems of insufficient fitting. In addition, the liquid cooling plate is fitted to the bottom of the component to be cooled, making it difficult to cool the upper part of the component to be cooled, resulting in lower battery pack cooling performance. Utility Model Content

[0004] In view of this, the utility model aims to provide a battery pack cooling system to facilitate the cooling of the components to be cooled by the coolant, thereby facilitating the improvement of the cooling effect of the battery pack.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] A battery pack cooling system comprises a liquid storage part, a pumping part and a liquid outlet part integrated in the battery pack; the liquid storage part is located at the bottom of the battery pack, the inlet of the pumping part is located in the liquid storage part, the liquid outlet part is connected to the outlet of the pumping part, and the outlet of the liquid outlet part is arranged corresponding to the component to be cooled in the battery pack; driven by the pumping part, the insulating coolant in the liquid storage part can be transported to the position of the component to be cooled, and the component to be cooled is cooled, and the cooled insulating coolant can flow back to the liquid storage part.

[0007] Furthermore, the liquid storage portion includes a liquid storage cavity formed at the bottom of the battery pack.

[0008] Furthermore, a partition plate is provided in the battery pack, and the partition plate separates the liquid storage cavity at the bottom of the battery pack. A reflux hole is provided on the partition plate, and the insulating coolant flows back into the liquid storage cavity through the reflux hole.

[0009] Furthermore, the partition plate is a liquid cooling plate, and the reflux hole is provided on the liquid cooling plate.

[0010] Furthermore, the pumping unit includes a cooling pump disposed in the battery pack, and an inlet of the cooling pump extends into the liquid storage unit, and the liquid outlet is connected to an outlet of the cooling pump.

[0011] Furthermore, the liquid outlet portion includes a liquid outlet pipe connected to the outlet of the pumping portion, and the liquid outlet of the liquid outlet pipe is arranged corresponding to the component to be cooled.

[0012] Furthermore, the liquid outlet pipe includes a main pipe connected to the outlet of the pumping part, and multiple branch pipes connected to the main pipe; the liquid outlet includes a liquid outlet hole provided on the wall of the main pipe and / or each branch pipe, and the liquid outlet hole is arranged toward the component to be cooled.

[0013] Furthermore, the components to be cooled include bus bars and / or electrical control components.

[0014] Furthermore, a heating module for heating the insulating coolant is provided on the pumping part and / or the liquid outlet part.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] The battery pack cooling system described in the utility model, through the liquid storage part integrated in the bottom of the battery pack and the liquid outlet part arranged at the outlet corresponding to the component to be cooled, can facilitate the insulating coolant to be transported to the position of the component to be cooled, so as to cool the component to be cooled, and return to the liquid storage part by gravity for recycling, thereby helping to improve the cooling effect of the component to be cooled in the battery pack.

[0017] In addition, by adopting a liquid storage cavity arranged at the bottom of the battery box, the bottom space of the battery box can be effectively utilized, and the cooling liquid can be gravity-fed back to the liquid storage part after cooling. By providing a partition plate and a reflux hole, the insulating coolant can be conveniently refluxed and stored, which is conducive to improving the reliability and stability of the cooling system.

[0018] Secondly, the use of a liquid cooling plate as a partition plate can dissipate heat from the bottom of the cooling component and the insulating coolant, which is beneficial to improving the cooling effect of the cooling system. By arranging a pump in the battery pack, the insulating coolant can be easily circulated and pumped.

[0019] In addition, the liquid outlet is located at a position corresponding to the part to be cooled, and the insulating coolant can be delivered to the part to be cooled, which is beneficial to improving the cooling effect. By using multiple branch pipes, the insulating coolant can be evenly sprayed on the surface of the part to be cooled, which is beneficial to improving the cooling effect and uniformity.

[0020] Furthermore, by cooling the busbars and electrical control components, the temperature of the heat generating components in the battery pack can be effectively reduced, which is beneficial to ensure the cooling performance of the battery pack. By setting up a heating module, the insulating coolant can be heated in a low temperature environment, thereby improving the performance of the battery pack in a low temperature environment.

[0021] Another object of the present invention is to provide an energy storage device, wherein the battery pack in the energy storage device is provided with the battery pack cooling system as described above.

[0022] The energy storage device of the present invention has the same beneficial effects as the battery pack cooling system described above relative to the prior art, and will not be described in detail herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0024] Figure 1 This is a schematic diagram of the structure of the battery pack cooling system according to an embodiment of the utility model;

[0025] Figure 2 A top view of a battery pack cooling system according to an embodiment of the present utility model;

[0026] Figure 3 For along Figure 2 Cross-sectional view along the BB direction;

[0027] Figure 4 For along Figure 2 Sectional view along CC direction;

[0028] Figure 5 For along Figure 2 Cross-sectional view along the DD direction;

[0029] Figure 6 for Figure 1 Enlarged view of point A in the middle.

[0030] Description of reference numerals:

[0031] 1. Liquid storage part; 11. Liquid storage cavity; 2. Pumping part; 21. Cooling pump; 22. Inlet; 3. Liquid outlet; 31. Liquid outlet pipe; 311. Main pipe; 312. Branch pipe; 313. Liquid outlet; 3131. Liquid outlet hole; 4. Battery box; 41. Battery cell accommodating cavity; 42. Electrical component accommodating cavity; 5. Partition plate; 6. Reflux hole; 7. Bus; 8. Electrical control component. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0033] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0034] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0035] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0036] Embodiment 1

[0037] This embodiment relates to a battery pack cooling system, which has an overall structure and is combined with Figures 1 to 6 As shown, the battery pack cooling system includes a liquid storage part 1, a pumping part 2 and a liquid outlet part 3 integrated in the battery pack.

[0038] Among them, the liquid storage part 1 is located at the bottom of the battery pack, the inlet 22 of the pumping part 2 is located in the liquid storage part 1, the liquid outlet part 3 is connected to the outlet of the pumping part 2, and the outlet of the liquid outlet part 3 is set corresponding to the component to be cooled in the battery pack.

[0039] At this time, driven by the pumping unit 2 , the insulating coolant in the liquid storage unit 1 of this embodiment can be transported to the position of the component to be cooled and cool the component to be cooled, and the cooled insulating coolant can flow back into the liquid storage unit 1 .

[0040] As shown in the above structure, the battery pack cooling system of this embodiment can facilitate the insulating coolant to be transported to the position of the component to be cooled, so as to cool the component to be cooled, and return to the liquid storage part 1 by gravity for recycling, thereby helping to improve the cooling effect of the component to be cooled in the battery pack.

[0041] Based on the above overall introduction, specifically, the insulating coolant in this embodiment adopts relevant insulating coolant products well known to those skilled in the art, such as hydrocarbon coolant, silicone oil, mineral oil. In addition, the insulating coolant is stored in a liquid storage portion 1 formed at the bottom of the battery pack.

[0042] At the same time, the outlet of the liquid outlet 3 is arranged in the area of ​​the component to be cooled in the battery pack, for example, on the top of the battery cell, on the upper part or around the controller. And, driven by the pumping part 2, the insulating coolant can be sprayed from the outlet of the liquid outlet 3 onto the component to be cooled, so as to cool it down.

[0043] As a preferred embodiment, Figures 3 to 5 As shown, the liquid storage part 1 of this embodiment includes a liquid storage cavity 11 formed at the bottom of the battery pack. At this time, by adopting the liquid storage cavity 11 set at the bottom of the battery box 4, the bottom space of the battery box 4 can be effectively utilized, and the cooling liquid can be gravity-returned to the liquid storage part 1 after cooling.

[0044] Specifically, in this embodiment, the sealed liquid storage cavity 11 at the bottom of the battery box 4 is used to accommodate the insulating coolant in the liquid storage cavity 11. Of course, in addition to using the battery box 4 structure to form the liquid storage cavity 11, an independent cavity can also be provided at the bottom of the battery pack to accommodate the insulating coolant.

[0045] In this embodiment, as a preferred implementation, Figures 1 to 5 As shown, a partition plate 5 is provided in the battery pack, and the partition plate 5 separates a liquid storage chamber 11 at the bottom of the battery pack. In addition, a reflux hole 6 is provided on the partition plate 5, and the insulating coolant flows back into the liquid storage chamber 11 through the reflux hole 6.

[0046] In this way, by providing the partition plate 5 and the reflux hole 6, the insulating coolant can be easily refluxed and stored, which is beneficial to improving the reliability and stability of the cooling system. In specific implementation, the partition plate 5 is provided above the bottom plate of the battery box 4, so that a liquid storage cavity 11 for accommodating the insulating coolant is formed between the partition plate 5 and the bottom plate of the battery box 4.

[0047] At the same time, the battery cells and electrical control components 8 in the battery pack are arranged on the partition plate 5, so that the insulating coolant sprayed on the components to be cooled, under the action of its own gravity, flows back to the liquid storage chamber 11 under the partition plate 5 through the reflux hole 6, so that the insulating coolant can be circulated in the battery pack.

[0048] In this embodiment, as a preferred implementation, the partition plate 5 of this embodiment adopts a liquid cooling plate, and the liquid cooling plate is provided with a reflux hole 6. At this time, the liquid cooling plate is used as the partition plate 5, which can dissipate heat from the bottom of the component to be cooled and the insulating coolant, which is beneficial to improve the cooling effect of the cooling system.

[0049] In specific implementation, the liquid cooling plate of this embodiment is connected to the external cooling device of the battery pack, such as a heat exchanger, through a pipeline, and the components to be cooled in the battery pack, such as battery cells and electrical control components 8, are connected to the liquid cooling plate through, for example, thermal conductive glue, so that the battery cells and the bottom of the electrical control components 8 are cooled through the liquid cooling plate.

[0050] At the same time, after the insulating coolant cools the components to be cooled, it flows to the liquid cooling plate. In this way, the insulating coolant is cooled by the liquid cooling plate, and the heat generated by the components to be cooled is transferred to the outside of the battery pack through the liquid cooling plate.

[0051] As a preferred embodiment, Figure 3 to Figure 4 As shown, the pumping unit 2 includes a cooling pump 21 disposed in the battery pack, and the inlet 22 of the cooling pump 21 extends into the liquid storage unit 1, and the liquid outlet 3 is connected to the outlet of the cooling pump 21. In this way, by disposing the pump in the battery pack, the insulating coolant can be conveniently circulated and pumped.

[0052] In detail, the cooling pump 21 of this embodiment can adopt existing related products with coolant pumping function, and when setting the cooling pump 21, the inlet 22 of the cooling pump 21 is extended into the liquid storage cavity 11 at the bottom of the battery pack to facilitate the cooling pump 21 to absorb the insulating coolant.

[0053] As a preferred embodiment, Figures 1 to 4 ,as well as Figure 6 As shown, the liquid outlet part 3 of this embodiment includes a liquid outlet pipe 31 connected to the outlet of the pumping part 2, and the liquid outlet 313 of the liquid outlet pipe 31 is arranged corresponding to the component to be cooled.

[0054] At this time, the liquid outlet 313 of this embodiment corresponds to the location where the part to be cooled is set, so that the insulating coolant can be directly sprayed on the part to be cooled, which is beneficial for the insulating coolant to improve the cooling effect of the part to be cooled.

[0055] In this embodiment, as a preferred implementation, the liquid outlet pipe 31 includes a main pipe 311 connected to the outlet of the pumping unit 2, and a plurality of branch pipes 312 connected to the main pipe 311. In addition, the liquid outlet 313 includes a liquid outlet hole 3131 provided on the wall of the main pipe 311 or each branch pipe 312.

[0056] In addition to being respectively provided on the tube wall of the main tube 311 or each branch tube 312, in this embodiment, the liquid outlet hole 3131 can also be provided on the tube wall of the main tube 311 and each branch tube 312. At the same time, the liquid outlet hole 3131 is provided toward the component to be cooled. In this way, by using multiple branch tubes 312, the insulating coolant can be evenly sprayed on the surface of the component to be cooled, which is conducive to improving the cooling effect and uniformity.

[0057] When implementing it, Figure 1 , Figure 2 as well as Figure 6 As shown, in this embodiment, a plurality of branch pipes 312 are connected to the main pipe 311 connected to the outlet of the pumping part 2, and the insulating coolant is transported to each component to be cooled through each branch pipe 312, and then the coolant is sprayed to the component to be cooled through the liquid outlet holes 3131 arranged on the pipe wall.

[0058] It should be noted that, in addition to providing a liquid storage hole on the pipe wall facing the component to be cooled, in this embodiment, the pipe mouth of the main pipe 311 or the branch pipe 312 can also be used as the liquid outlet 313, so that the insulating coolant flows out from the pipe mouth to the component to be cooled, which is also feasible.

[0059] As a preferred embodiment, Figure 1 , Figure 2 ,as well as Figures 4 to 6 As shown, the components to be cooled in this embodiment include the busbar 7 or the electrical control component 8. In addition, the busbar 7 or the electrical control component 8 in this embodiment can also serve as the components to be cooled at the same time.

[0060] At this time, by cooling the busbar 7 and the electrical control component 8, the temperature of the heat generating components in the battery pack can be effectively reduced, which is conducive to ensuring the cooling performance of the battery pack. In detail, the electrical control component 8 of this embodiment is specifically a heat generating electrical component on the battery pack, such as a relay.

[0061] In a specific implementation, as an exemplary structure, the battery box 4 is divided into an electrical component accommodating chamber 42 for arranging the electrical control component 8, and a battery cell accommodating chamber 41 for accommodating the battery cell, and both chambers use a liquid cooling plate as the bottom plate, and are connected to the liquid storage chamber 11 through the reflux hole 6 on the liquid cooling plate.

[0062] In detail, Figure 1 , Figure 2 as well as Figure 6 As shown, the battery cell of this embodiment is arranged in the battery cell accommodating cavity 41, and the busbar 7 is connected to the pole of the adjacent battery cell. In addition, as an exemplary structure, a branch pipe 312 is arranged between the two busbars 7 on each battery cell.

[0063] At the same time, corresponding to the two poles connected to each bus 7, a liquid outlet hole 3131 is opened on the tube wall of the branch pipe 312 to spray the insulating coolant to the bus 7. Of course, in addition to setting the liquid outlet holes 3131 corresponding to the two poles, the liquid outlet holes 3131 of this embodiment can also be used in other numbers, and setting one liquid outlet hole 3131 corresponding to the bus 7 is also feasible.

[0064] Likewise, as an exemplary structure, Figures 1 to 4 As shown, the electrical control component 8 of this embodiment is arranged in the electrical component accommodating chamber 42, and a branch pipe 312 is arranged around the electrical control component 8, and a liquid outlet hole 3131 opened downward is provided on the branch pipe 312 to spray insulating coolant to the electrical control component 8.

[0065] In addition to being arranged above the electrical control component 8 , in this embodiment, a branch pipe 312 may also be arranged around the electrical control component 8 , and a liquid outlet 3131 facing the electrical control component 8 is provided on the branch pipe 312 to spray cooling liquid on the electrical control component 8 .

[0066] As a preferred embodiment, a heating module for heating the insulating coolant is provided on the pumping part 2 or the liquid outlet part 3, or heating modules are provided on both the pumping part 2 and the liquid outlet part 3. In this way, the insulating coolant can be heated in a low-temperature environment, thereby improving the performance of the battery pack in a low-temperature environment.

[0067] In specific implementation, the heating module of this embodiment can be an existing heating module with heating function, such as a heating plate, a heating tube, or a coolant pump with heating function. In this way, when the insulating coolant is lower than the set temperature value, the heating module is powered on to generate heat, which can heat the insulating coolant.

[0068] The battery pack cooling system of the present embodiment, through the liquid storage portion 1 integrated at the bottom of the battery pack, the liquid outlet portion 3 provided with an outlet corresponding to the component to be cooled, and the pumping portion 2, can facilitate the insulating coolant to be transported to the position of the component to be cooled, such as the bus 7 or the electrical control component 8, so as to cool the component to be cooled, and can flow back to the liquid storage portion 1 by gravity for recycling, thereby facilitating the cooling effect of the component to be cooled in the battery pack.

[0069] Embodiment 2

[0070] This embodiment relates to an energy storage device, in which a battery pack is provided with the battery pack cooling system of Embodiment 1. The structures not described in the energy storage device and the battery pack may refer to the existing structures.

[0071] The energy storage device of this embodiment can effectively cool the components to be cooled inside the battery pack by applying the battery pack cooling system in the first embodiment, thereby improving the overall performance, reliability and safety of the battery pack.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery pack cooling system, characterized in that: It includes a liquid storage part, a pumping part and a liquid discharge part integrated in the battery pack; The liquid storage part is located at the bottom of the battery pack, the inlet of the pumping part is located in the liquid storage part, the liquid outlet is connected to the outlet of the pumping part, and the outlet of the liquid outlet is arranged corresponding to the component to be cooled in the battery pack; Driven by the pumping unit, the insulating coolant in the liquid storage unit can be transported to the position of the component to be cooled, and cool the component to be cooled, and the cooled insulating coolant can flow back into the liquid storage unit.

2. The battery pack cooling system according to claim 1, characterized in that: The liquid storage portion includes a liquid storage cavity formed at the bottom of the battery pack.

3. The battery pack cooling system according to claim 2, characterized in that: A partition plate is provided in the battery pack, and the partition plate separates the liquid storage cavity at the bottom of the battery pack. A reflux hole is provided on the partition plate, and the insulating coolant flows back into the liquid storage cavity through the reflux hole.

4. The battery pack cooling system according to claim 3, characterized in that: The partition plate is a liquid cooling plate, and the reflux hole is arranged on the liquid cooling plate.

5. The battery pack cooling system according to claim 1, characterized in that: The pumping unit includes a cooling pump disposed in the battery pack, and an inlet of the cooling pump extends into the liquid storage unit, and the liquid outlet is connected to an outlet of the cooling pump.

6. The battery pack cooling system according to claim 1, characterized in that: The liquid outlet portion comprises a liquid outlet pipe connected to the outlet of the pumping portion, and a liquid outlet of the liquid outlet pipe is arranged corresponding to the component to be cooled.

7. The battery pack cooling system according to claim 6, characterized in that: The liquid outlet pipe comprises a main pipe connected to the outlet of the pumping part, and a plurality of branch pipes connected to the main pipe; The liquid outlet comprises a liquid outlet hole provided on the wall of the main pipe and / or each branch pipe, and the liquid outlet hole is arranged toward the component to be cooled.

8. The battery pack cooling system according to claim 1, characterized in that: The components to be cooled include busbars and / or electrical control components.

9. The battery pack cooling system according to any one of claims 1 to 8, characterized in that: The pumping part and / or the liquid outlet part is provided with a heating module for heating the insulating coolant.

10. An energy storage device, characterized in that: The battery pack in the energy storage device is provided with a battery pack cooling system as described in any one of claims 1 to 9.

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