Liquid cooling energy storage battery pack

Abstract

The utility model provides a liquid-cooled energy storage battery pack, which comprises an upper shell, a lower shell, a liquid-cooled energy storage battery pack, a liquid-cooled energy storage battery pack and a liquid-cooled energy storage battery pack, the lower shell is used for containing the battery pack, a liquid cooling heat dissipation pipeline is arranged in the lower shell and used for dissipating heat of the side face and the bottom of the battery panel, and the battery pack serves as a main energy storage device. According to the utility model, the liquid cooling heat dissipation pipelines are arranged in the upper shell and the lower shell, so that the battery pack can be subjected to full-surrounding heat dissipation, the heat dissipation efficiency is improved, the temperature difference between the bottom and the top of the battery pack can be reduced, and the durability of the battery pack is greatly improved; the pipeline body is protected, the embedded cooling liquid pipeline is completely isolated from the battery pack, and the battery pack is not affected even if the cooling liquid pipeline is broken.

Description

Technical Field

[0001] This utility model relates to the field of energy storage battery technology, and more specifically, to a liquid-cooled energy storage battery pack. Background Technology

[0002] With the development of the new energy industry, the demand for electricity from all walks of life is gradually increasing, and energy storage battery packs are widely used in the field of new energy vehicles due to their high energy density and high energy transmission efficiency.

[0003] For energy storage battery packs, the main factor affecting their performance is heat dissipation. However, heat dissipation should not only focus on efficiency, but also pay attention to the temperature difference between the top and bottom of the battery pack. A large temperature difference will also affect battery performance. The existing heat dissipation methods for energy storage battery packs are mainly air cooling and liquid cooling. Liquid cooling has higher heat dissipation efficiency. However, the existing liquid-cooled energy storage battery packs only set up liquid cooling plates at the bottom for heat dissipation, without heat dissipation on the sides and top of the battery pack. This not only results in low heat dissipation efficiency, but also leads to a large temperature difference between the top and bottom of the battery, which affects battery performance.

[0004] Therefore, there is an urgent need for a technology to replace the existing liquid-cooled energy storage battery packs that rely on bottom liquid cooling plates for heat dissipation, in order to solve the problem of how to improve heat dissipation efficiency and reduce the large temperature difference between the top and bottom of the battery pack. Summary of the Invention

[0005] In view of this, this utility model proposes a liquid-cooled energy storage battery pack, which aims to solve the problem of how to improve heat dissipation efficiency and reduce the large temperature difference between the top and bottom of the battery pack.

[0006] This utility model provides a liquid-cooled energy storage battery pack, including: an upper shell, a battery pack and a lower shell;

[0007] The battery pack includes several battery cells;

[0008] The lower housing is a box structure, which is used to house the battery pack. The bottom and sides of the lower housing are provided with a first liquid cooling section, which is used to cool the bottom and sides of the battery pack.

[0009] The upper housing covers the opening of the lower housing and is in contact with the top of the battery pack. The upper housing is provided with a second liquid cooling section for cooling the top of the battery pack.

[0010] Furthermore, the lower housing includes

[0011] The lower side panel, as described above, is arranged to form a square box with openings at both ends;

[0012] The first liquid cooling section includes a bottom liquid cooling plate and side liquid cooling plates. The bottom liquid cooling plate is connected to four lower side plates to form a box structure. A plurality of side liquid cooling plates are provided. The plurality of side liquid cooling plates are arranged vertically and arranged side by side above the bottom liquid cooling plate. The side liquid cooling plates are used to divide the internal space of the box structure into a plurality of sections.

[0013] Lower reinforcing ribs are respectively provided at the upper ends of the four lower side plates, and several through holes are evenly provided on the lower reinforcing ribs;

[0014] A lower thermal pad is laid on the surface of the lower side plate, the bottom liquid cooling plate, and the side liquid cooling plate, and the lower thermal pad is used for heat transfer.

[0015] Furthermore, the first liquid cooling section also includes a bottom coolant pipe and a side coolant pipe.

[0016] The bottom coolant pipe is located inside the bottom liquid cooling plate, with an inlet at one end and an outlet at the other end.

[0017] The side coolant pipe is located inside the side coolant plate.

[0018] Furthermore, both ends of the side coolant pipe are connected to the bottom coolant pipe.

[0019] Furthermore, the lower first liquid cooling section also includes:

[0020] The bottom cooling device is connected to the inlet and outlet of the bottom liquid cooling plate. The bottom cooling device is used to cool the coolant flowing out of the outlet and pump it back into the inlet to form a circulation.

[0021] Furthermore, the upper housing includes:

[0022] The upper side panel, as described above, is arranged to form a square box with openings at both ends;

[0023] The second liquid cooling section includes a top liquid cooling plate, which is connected to the four upper side plates to form a box structure;

[0024] Upper reinforcing ribs are respectively provided at the lower ends of the four upper side plates, and the lower reinforcing ribs are evenly provided with a number of through holes corresponding to the upper reinforcing ribs;

[0025] An upper thermal pad is laid on the surface of the upper side plate, and the upper thermal pad is used for heat transfer.

[0026] Furthermore, the second liquid cooling unit also includes:

[0027] A top coolant pipe is installed inside the top liquid cooling plate. One end of the top coolant pipe is provided with an inlet and the other end is provided with an outlet.

[0028] The top cooling device is connected to the inlet and outlet of the top liquid cooling plate. The top cooling device is used to cool the coolant flowing out of the outlet and pump it back into the inlet to form a circulation.

[0029] Furthermore, the inner surface of the top liquid cooling plate is wavy, with the recessed portion corresponding to the protruding parts on both sides of the battery pack electrode and the protruding portion corresponding to the recessed part in the middle of the battery pack.

[0030] Furthermore, the wavy inner surface of the top liquid cooling plate is coated with a waterproof coating.

[0031] Furthermore, the bottom liquid cooling plate is evenly equipped with several temperature detection devices, and the corresponding position on the inner side of the top liquid cooling plate is also equipped with several temperature detection devices for real-time detection of the temperature at the bottom and top of the battery pack.

[0032] Compared with the prior art, the beneficial effect of this utility model is that by setting the first liquid cooling part and the second liquid cooling part on the upper shell and the lower shell to wrap the battery pack for all-round heat dissipation, the heat dissipation efficiency is greatly improved and the temperature difference between the upper and lower parts of the battery pack is not too large.

[0033] This invention directly contacts the battery pack by setting flexible thermal pads in the upper and lower shells, which greatly increases the heat dissipation area of ​​the battery pack and also provides a certain degree of protection for the battery pack.

[0034] The inner side of the top liquid cooling plate of this utility model is wavy, which makes it fit the top structure of the battery better, increases the contact area and improves the heat dissipation efficiency.

[0035] The coolant pipes on the middle side of this invention are connected to the coolant pipes in the bottom liquid cooling plate, so that the liquid cooling plates on each side do not need to be equipped with pipes and cooling devices, thus greatly reducing the battery pack volume.

[0036] This invention prevents coolant from seeping out and affecting the battery pack by applying a waterproof coating to the wavy inner surface of the top liquid cooling plate.

[0037] This invention features temperature detection devices installed at corresponding positions in both the upper and lower casings to monitor the battery pack temperature. Attached Figure Description

[0038] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0039] Figure 1 This is a schematic diagram of the overall structure of the liquid-cooled energy storage battery pack provided in an embodiment of the present invention;

[0040] Figure 2 A schematic diagram of the lower shell structure provided in an embodiment of this utility model;

[0041] Figure 3 A schematic diagram of the first liquid cooling section provided in an embodiment of this utility model.

[0042] Figure 4 A schematic diagram of the cross-section of the bottom liquid cooling plate provided in an embodiment of this utility model;

[0043] Figure 5 A cross-sectional schematic diagram of the side liquid cooling plate provided in an embodiment of this utility model;

[0044] Figure 6 This is a schematic diagram of the structure of the lower thermal conductive pad provided in an embodiment of the present utility model;

[0045] Figure 7 This is a schematic diagram of the battery pack provided in an embodiment of the present utility model;

[0046] Figure 8 A schematic diagram of the upper shell provided in an embodiment of this utility model;

[0047] Figure 9 This is a structural schematic diagram of the cross-sectional view of the upper shell provided in an embodiment of the present utility model;

[0048] In the diagram: 100 - Upper housing; 110 - Second liquid cooling section; 111 - Top liquid cooling plate; 112 - Top cooling device; 113 - Top coolant pipe; 120 - Upper side plate; 130 - Upper reinforcing rib; 140 - Through hole; 150 - Upper thermal pad; 200 - Lower housing; 210 - Lower side plate; 220 - First liquid cooling section; 221 - Bottom liquid cooling plate; 222 - Side liquid cooling plate; 223 - Bottom cooling device; 224 - Liquid outlet; 225 - Liquid inlet; 226 - Bottom coolant pipe; 227 - Side coolant pipe; 230 - Temperature detection device; 240 - Reinforcing rib; 250 - Lower thermal pad; 300 - Battery pack. Detailed Implementation

[0049] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0050] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0051] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0052] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0053] See Figure 1-7 As shown, this embodiment provides a liquid-cooled energy storage battery pack, including: an upper shell 100, a battery pack 300, and a lower shell 200.

[0054] Specifically, the battery pack 300 includes several battery cells; the lower housing 200 is a box structure, which is used to house the battery pack 300. The bottom and sides of the lower housing 200 are provided with a first liquid cooling section 220, which is used to cool the bottom and sides of the battery pack 300; the upper housing 100 covers the opening of the lower housing 200 and contacts the top of the battery pack 300. The upper housing is provided with a second liquid cooling section 110, which is used to cool the top of the battery pack 200.

[0055] Understandably, the first liquid cooling section 220 and the second liquid cooling section 110 in the upper housing 100 and the lower housing 200 enclose the battery pack 300, dissipating heat from the top, bottom and sides of the battery pack 300. This not only improves heat dissipation efficiency but also ensures that the temperature difference between the top and bottom of the battery pack 300 is not too large.

[0056] See Figure 2 As shown, the lower housing 200 includes: a lower side plate 210, a first cooling section 220, a bottom liquid cooling plate 221, a side liquid cooling plate 222, a lower reinforcing rib 240, a lower thermal pad 250, and a through hole 140.

[0057] Specifically, the four lower side plates 210 are arranged to form a square box with open ends; the first liquid cooling section 220 includes a bottom liquid cooling plate 221 and side liquid cooling plates 222. The bottom liquid cooling plate 221 is connected to the four lower side plates 210 to form a box structure. Several side liquid cooling plates 222 are provided, which are arranged vertically and side by side above the bottom liquid cooling plate 221. The side liquid cooling plates 222 are used to divide the internal space of the box structure into several parts; lower reinforcing ribs 240 are respectively provided at the upper ends of the four lower side plates 210, and several through holes 140 are evenly opened on the lower reinforcing ribs 240; the lower heat-conducting pad 250 is a flexible heat-conducting pad laid on the surface of the lower side plates 210, the bottom liquid cooling plate 221 and the side liquid cooling plates 222. The lower heat-conducting pad 250 is used for heat transfer.

[0058] Understandably, the bottom liquid cooling plate 221 and several side liquid cooling plates 222 enable the lower housing 200 to dissipate heat from the bottom and sides of the battery pack 300; the lower thermal pad 250 makes flexible contact with the battery pack 300, increasing the contact area and thus increasing the heat dissipation area, which greatly enhances the heat dissipation efficiency.

[0059] See Figure 3-5 As shown, the first liquid cooling unit 220 also includes a bottom coolant pipe 226 and a side coolant pipe 227.

[0060] Specifically, the bottom coolant pipe 226 is located inside the bottom liquid cooling plate 221, with an inlet 225 at one end and an outlet 224 at the other end; the side coolant pipe 227 is located inside the side liquid cooling plate 222, with the inlet 225 of the side coolant pipe 227 connected to the inlet 225 of the bottom coolant pipe 226, allowing coolant to enter the side coolant pipe 227 through the bottom coolant pipe 226, and the outlet 224 of the side coolant pipe 227 connected to the outlet 224 of the bottom coolant pipe 226, allowing coolant from the side coolant pipe 227 to flow into the bottom coolant pipe 226.

[0061] It is understandable that the side coolant pipe 227 is connected to the bottom coolant pipe 226, so that each side liquid cooling plate 222 does not need to be equipped with pipes and cooling devices, which greatly reduces the battery pack volume.

[0062] See Figure 3 As shown, the first liquid cooling section 220 also includes a bottom cooling device 223, which is connected to the liquid inlet 225 and the liquid outlet 224 of the bottom liquid cooling plate 221. The bottom cooling device 223 is used to re-cool the coolant flowing out of the liquid outlet 224 and then pump it back into the liquid inlet to form a circulation.

[0063] Understandably, the bottom cooling device 223 re-cools the coolant flowing out of the outlet 224 and then pumps it back into the inlet to form a circulation, ensuring that the coolant can effectively carry away the heat of the battery pack 300.

[0064] See Figure 1-9 As shown, the upper housing 100 includes: an upper side plate 120, a second liquid cooling section 110, an upper reinforcing rib 130, and an upper thermal pad 150.

[0065] Specifically, the four upper side panels 120 are arranged to form a square box with open ends; the second liquid cooling section 110 includes a top liquid cooling plate 111, which is connected to the four upper side panels 120 to form a box structure; upper reinforcing ribs 130 are respectively arranged at the lower ends of the four upper side panels 120, and the upper reinforcing ribs 130 are evenly provided with a number of through holes 140 corresponding to the lower reinforcing ribs 240; the upper thermal pad 150 is laid on the surface of the upper side panels 120 and is used for heat transfer.

[0066] Understandably, the through holes 140 on the upper reinforcing rib 130 and the lower reinforcing rib 240 allow the upper housing 100 and the lower housing 200 to be connected by bolts; the upper thermal pad 150 is a flexible thermal pad that is in direct contact with the upper end of the battery pack, increasing the contact area and improving heat dissipation efficiency.

[0067] See Figure 1-9 As shown, the second liquid cooling section 110 further includes: a top coolant pipe 113 disposed inside the top liquid cooling plate 111, with an inlet 225 at one end and an outlet 224 at the other end for circulating coolant; and a top cooling device 112 connected to the inlet 225 and outlet 224 of the top coolant pipe 113 for recooling the coolant flowing out of the outlet 224 and pumping it back into the inlet 225 to form a circulation.

[0068] Understandably, the first liquid cooling unit 220 removes heat from the bottom and sides of the battery pack 300, while the second liquid cooling unit removes heat from the top of the battery pack 300, so that the temperature difference between the top and bottom of the battery pack 300 is not too large and thus affects battery efficiency.

[0069] Refer to Figure 9 As shown, the inner side of the top liquid cooling plate 111 is wavy, and the concave part corresponds to the convex parts on both sides of the electrodes of the battery pack 300, and the convex part corresponds to the concave part in the middle of the battery pack 300.

[0070] It can be understood that due to the differences in the connecting pieces and electrode contacts, the upper part of the battery pack is uneven. Setting the inner side of the top liquid cooling plate 111 in contact with it to be wavy will increase the contact area and thus improve the heat dissipation efficiency;

[0071] Refer to Figure 9 As shown, a waterproof coating is applied on the wavy inner side of the top liquid cooling plate 111.

[0072] It can be understood that by applying a waterproof coating on the wavy inner side of the top liquid cooling plate, the problem of coolant leaking out and affecting the battery pack is avoided;

[0073] Refer to Figure 1-9 As shown, the above-mentioned bottom liquid cooling plate 221 is provided with a temperature detection device 230, and a temperature detection device 230 is also provided at the corresponding position on the inner side of the top liquid cooling plate 111 for detecting the temperatures of the bottom and top of the battery pack 300 in real time.

[0074] Specifically, the two temperature detection devices 230 are preset with a first temperature threshold K1 and a second temperature threshold K2, and K1 < K2, and the temperature of the battery pack 300 is detected in real time. When the temperature detection device 230 detects that the temperature of the battery pack 300 exceeds K1, it will transmit information about the overheating of the battery pack to the outside to remind the operator to cut off the power supply; when the temperature detection device 230 detects that the temperature of the battery pack exceeds K2, the power supply will be forcibly cut off.

[0075] It can be understood that the two temperature detection devices 230 detect the temperature of the battery pack in real time and are provided with temperature thresholds, which greatly improves the safety of the battery pack.

[0076] Those of ordinary skill in the art can understand that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A liquid-cooled energy storage battery pack, characterized in that, include: Upper casing, battery pack, and lower casing; The battery pack includes several battery cells; The lower housing is a box structure, which is used to house the battery pack. The bottom and sides of the lower housing are provided with a first liquid cooling section, which is used to cool the bottom and sides of the battery pack. The upper housing covers the opening of the lower housing and is in contact with the top of the battery pack. The upper housing is provided with a second liquid cooling section for cooling the top of the battery pack. The lower housing includes The lower side panel, as described above, is arranged to form a square box with openings at both ends; The first liquid cooling section includes a bottom liquid cooling plate and side liquid cooling plates. The bottom liquid cooling plate is connected to four lower side plates to form a box structure. A plurality of side liquid cooling plates are provided. The plurality of side liquid cooling plates are arranged vertically and arranged side by side above the bottom liquid cooling plate. The side liquid cooling plates are used to divide the internal space of the box structure into a plurality of sections. Lower reinforcing ribs are respectively provided at the upper ends of the four lower side plates, and several through holes are evenly provided on the lower reinforcing ribs; A lower thermal pad is laid on the surface of the lower side plate, the bottom liquid cooling plate and the side liquid cooling plate, and the lower thermal pad is used for heat transfer. The first liquid cooling section also includes a bottom coolant pipe and a side coolant pipe. The bottom coolant pipe is located inside the bottom liquid cooling plate, with an inlet at one end and an outlet at the other end. The side coolant pipe is located inside the side liquid cooling plate; Both ends of the side coolant pipe are connected to the bottom coolant pipe; The first liquid cooling unit further includes: A bottom cooling device is connected to the inlet and outlet of the bottom liquid cooling plate. The bottom cooling device is used to cool the coolant flowing out of the outlet and pump it back into the inlet to form a circulation. The upper housing includes: The upper side panel, as described above, is arranged to form a square box with openings at both ends; The second liquid cooling section includes a top liquid cooling plate, which is connected to the four upper side plates to form a box structure; Upper reinforcing ribs are respectively provided at the lower ends of the four upper side plates, and the lower reinforcing ribs are evenly provided with a number of through holes corresponding to the upper reinforcing ribs; An upper thermal pad is laid on the surface of the upper side plate, and the upper thermal pad is used for heat transfer.

2. The liquid-cooled energy storage battery pack according to claim 1, characterized in that, The second liquid cooling section also includes: A top coolant pipe is installed inside the top liquid cooling plate. One end of the top coolant pipe is provided with an inlet and the other end is provided with an outlet. The top cooling device is connected to the inlet and outlet of the top liquid cooling plate. The top cooling device is used to cool the coolant flowing out of the outlet and pump it back into the inlet to form a circulation.

3. The liquid-cooled energy storage battery pack according to claim 2, characterized in that, The inner surface of the top liquid cooling plate is wavy, with the recessed part corresponding to the protruding parts on both sides of the battery pack electrode and the protruding part corresponding to the recessed part in the middle of the battery pack.

4. The liquid-cooled energy storage battery pack according to claim 3, characterized in that, The wavy inner surface of the top liquid cooling plate is coated with a waterproof coating.

5. The liquid-cooled energy storage battery pack according to any one of claims 1-4, characterized in that, The bottom liquid cooling plate is uniformly equipped with several temperature detection devices, and the corresponding position on the inner side of the top liquid cooling plate is also equipped with several temperature detection devices to detect the temperature of the bottom and top of the battery pack in real time.

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