Battery pack and energy storage system

Abstract

The utility model provides a battery pack and an energy storage system, and relates to the technical field of batteries, the battery pack comprises a plurality of battery modules and a box body; the box body is provided with an accommodating cavity; the plurality of battery modules are distributed in the accommodating cavity at intervals along a first direction; a liquid cooling pipeline is arranged between the adjacent battery modules, and the liquid cooling pipeline extends along a second direction; wherein the second direction and the first direction intersect with each other; the part, located in the box body, of the liquid cooling pipeline is provided with liquid distribution holes, and the liquid distribution holes are communicated with the containing cavity. According to the battery pack provided by the utility model, smaller temperature rise can be realized through immersed liquid cooling, and the cooling effect and the heat management efficiency are remarkably improved, so that the problems of thermal runaway and heat spreading of the battery pack are effectively restrained, the safety of the battery pack is improved, and the service life of the battery pack is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery pack and an energy storage system. Background Art

[0002] As the research and development of battery cells continues to develop in the direction of high-energy and high-power technologies, high-rate working scenarios of battery packs are becoming more frequent. In related technologies, the heat dissipation of battery packs usually adopts air cooling or indirect liquid cooling based on liquid cooling plates. Indirect liquid cooling means that the battery module and the cooling medium are not in direct contact. For example, when a liquid cooling plate is used, the battery module dissipates heat by contacting the liquid cooling plate filled with cooling medium, and the battery module and the cooling medium are not in direct contact. Among them, the efficiency of air cooling is low, and the contact area between indirect liquid cooling and devices such as batteries is limited, which limits the heat dissipation effect and cannot effectively prevent thermal runaway and heat spread of the battery pack, which has a great impact on the service life and safety of the battery pack. Utility Model Content

[0003] The embodiments of the utility model provide a battery pack and an energy storage system. The battery pack can dissipate heat through immersion liquid cooling, thereby improving the heat dissipation effect of the battery pack and ensuring safety.

[0004] In a first aspect, an embodiment of the present utility model provides a battery pack, comprising: a plurality of battery modules and a box;

[0005] The box body is provided with a accommodating cavity;

[0006] A plurality of battery modules are distributed in the accommodating cavity at intervals along a first direction;

[0007] A liquid cooling pipe is provided between adjacent battery modules, and the liquid cooling pipe extends along a second direction; wherein the second direction intersects with the first direction;

[0008] A liquid distribution hole is formed in the portion of the liquid cooling pipe located in the box body, and the liquid distribution hole is communicated with the accommodating cavity.

[0009] In some embodiments, the battery pack further includes a liquid inlet pipe and a liquid outlet pipe;

[0010] The liquid inlet pipe and the liquid outlet pipe are respectively arranged on the side walls of the box body on two opposite sides in the second direction; one end of the liquid cooling pipe is connected to the liquid inlet pipe, and the other end is closed.

[0011] In some embodiments, the box body includes a box cover and a shell, and the box cover and the shell are arranged along a third direction to form the box body; wherein the third direction is perpendicular to the plane where the first direction and the second direction are located;

[0012] The liquid cooling pipe is located between adjacent battery modules on one side close to the box cover, and the liquid distribution hole opens in a direction away from the box cover.

[0013] In some embodiments, the liquid inlet pipe is located at one end of the shell side wall close to the box cover, and the liquid outlet pipe is located at one end of the shell side wall away from the box cover.

[0014] In some embodiments, the battery pack further includes a support beam, wherein the support beam is located between the plurality of battery modules and the box body.

[0015] In some embodiments, each of the battery modules includes a plurality of battery cells arranged along the second direction, and a liquid cooling channel is provided between adjacent battery cells.

[0016] In some embodiments, a plurality of foams are disposed between adjacent battery cells, the plurality of foams are spaced apart along the third direction, and the liquid cooling channel is formed between adjacent foams.

[0017] In some embodiments, the battery pack further comprises a baffle;

[0018] A gap is formed between adjacent battery modules, and the two baffles are respectively arranged at two ends of the gap in the second direction.

[0019] In some embodiments, the battery pack further includes a low-voltage electrical compartment, and the low-voltage electrical compartment is disposed outside the box body.

[0020] In a second aspect, the utility model provides an energy storage system, comprising the battery pack as described above.

[0021] Beneficial effects of the embodiments of the utility model:

[0022] In an embodiment of the utility model, a battery pack includes a plurality of battery modules and a box body, the box body is provided with a receiving cavity, a plurality of battery modules are distributed in the receiving cavity at intervals along a first direction, a liquid cooling pipe is provided between adjacent battery modules, the liquid cooling pipe extends along a second direction intersecting the first direction, and a portion of the liquid cooling pipe located in the box body is provided with a liquid distribution hole, and the liquid distribution hole is connected to the receiving cavity. The liquid distribution holes on the liquid cooling pipe through which the cooling medium can pass are distributed in the receiving cavity, so that the battery module is immersed in the cooling medium, and a smaller temperature rise can be achieved through the immersion liquid cooling method, significantly improving the cooling effect and thermal management efficiency, thereby effectively curbing the thermal runaway and heat spread problems of the battery pack, improving the safety of the battery pack, and extending the service life of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a schematic diagram of the exploded structure of a battery pack provided in an embodiment of the utility model;

[0025] Figure 2 It is a schematic diagram of the three-dimensional structure of a battery pack provided by an embodiment of the utility model;

[0026] Figure 3 is a schematic side structural diagram of a battery pack provided by an embodiment of the utility model;

[0027] Figure 4 It is a structural schematic diagram of the battery module and liquid cooling pipeline assembly provided by an embodiment of the utility model;

[0028] Figure 5 yes Figure 4 Schematic diagram of the cross-sectional structure at AA in the middle;

[0029] Figure 6 It is a structural schematic diagram of a liquid cooling pipeline, a liquid inlet pipe and a liquid outlet pipe provided in an embodiment of the utility model;

[0030] Figure 7 It is a structural schematic diagram of the energy storage system provided by an embodiment of the utility model.

[0031] Description of reference numerals:

[0032] 1. Battery module; 11. Battery cell; 12. Foam; 121. Liquid cooling channel; 2. Box body; 21. Box cover; 22. Shell; 211. Explosion-proof valve; 221. Low-voltage electrical compartment; 2211. Low-voltage electrical components; 222. Liquid level gauge; 3. Liquid cooling pipe; 31. Liquid inlet pipe; 32. Liquid outlet pipe; 33. Baffle; 4. Support beam; 100. Battery pack; 200. Energy storage system. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model. In the utility model, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0034] First, as Figure 1-4 As shown, an embodiment of the utility model provides a battery pack 100, comprising: a plurality of battery modules 1 and a box body 2;

[0035] The box body is provided with a accommodating cavity;

[0036] The plurality of battery modules 1 are distributed in the accommodation cavity at intervals along the first direction X;

[0037] A liquid cooling pipe 3 is provided between adjacent battery modules 1, and the liquid cooling pipe 3 extends along a second direction Y; wherein the second direction Y intersects with the first direction X;

[0038] The portion of the liquid cooling pipe 3 located in the box body 2 is provided with a liquid distribution hole, and the liquid distribution hole is communicated with the accommodating cavity.

[0039] like Figure 1 As shown, a receiving cavity for receiving a plurality of battery modules 1 is provided in the box body 2, and the plurality of battery modules 1 are distributed in the receiving cavity at intervals along the first direction X. The box body 2 may be an aluminum box body, which has high strength and good corrosion resistance.

[0040] like Figure 1 and 4 As shown, a liquid cooling pipe 3 is provided between two adjacent battery modules 1, and the liquid cooling pipe 3 extends along the second direction Y, and the second direction Y intersects with the first direction X. That is, the liquid cooling pipe 3 is provided in the gap formed between the two battery modules 1, and the extension direction of the liquid cooling pipe 3 is the same as the extension direction of the gap formed between the two battery modules 1.

[0041] like Figure 1 , 3As shown in FIG. 4 , the portion of the liquid cooling pipe 3 located in the box body 2 is provided with a liquid distribution hole, and the liquid distribution hole is connected to the receiving cavity. Thus, the cooling medium can be distributed in the receiving cavity through the liquid distribution hole on the liquid cooling pipe, and the cooling medium can fully contact with the adjacent battery module 1, and the battery module 1 is immersed in the cooling medium.

[0042] Immersion liquid cooling can be achieved in the above manner. Since immersion liquid cooling is a direct cooling technology, it can effectively control the temperature rise of the battery pack 100, ensuring that the battery pack 100 works normally under harsh working conditions, and the cooling medium can fully contact each battery cell 11 in the battery module 1, thereby ensuring the consistency of heat dissipation of the battery cell 11 and improving the service life of the battery pack 100. In addition, immersion liquid cooling can effectively reduce the occurrence of thermal runaway and heat spread, thereby improving the safety of the battery pack 100.

[0043] For example, Figure 1 and 4 As shown, the battery pack 100 includes two battery modules 1, the two battery modules 1 are spaced apart along a first direction X, the liquid cooling pipe 3 is disposed between the two battery modules 1 and extends along a second direction Y, and the first direction X and the second direction Y are perpendicular to each other.

[0044] It should be noted that the cooling medium can be synthetic oil, fluorinated liquid or mineral oil, etc.; the number of battery modules 1 is not limited to two, and multiple battery modules 1 can be set according to needs. When more than two battery modules 1 are used, a liquid cooling pipe 3 can be set between two adjacent battery modules 1.

[0045] In some embodiments, Figure 1 , 3 As shown in 4 , the battery pack 100 further includes a liquid inlet pipe 31 and a liquid outlet pipe 32;

[0046] The liquid inlet pipe 31 and the liquid outlet pipe 32 are respectively arranged on the side walls of the box body 2 on opposite sides in the second direction Y; one end of the liquid cooling pipe 3 is connected to the liquid inlet pipe 31, and the other end is closed.

[0047] Specifically, one end of the liquid cooling pipe 3 extends to the outside of the box body 2 and is connected to the liquid inlet pipe 31, and the other end is located inside the box body 2 and is sealed with a plugging head. The cooling medium entering the liquid cooling pipe 3 from the liquid inlet pipe 31 cannot be discharged from the other end, but is evenly distributed to various positions in the box body 2 from the liquid distribution holes provided on the liquid cooling pipe 3, so as to dissipate heat from various locations of the battery module 1.

[0048] like Figure 3As shown, a liquid outlet pipe 32 is provided on the box body 2, and the cooling medium after heat exchange with the battery module 1 can be discharged through the liquid outlet pipe 32. By continuously inputting low-temperature cooling medium from the liquid inlet pipe 31 and discharging it from the liquid outlet pipe 32 after heat exchange with the battery module 1 in the box body 2, the heat of the battery module 1 can be effectively dissipated.

[0049] That is to say, by adding the liquid inlet pipe 31 and the liquid outlet pipe 32, new cooling medium can be continuously introduced into the battery pack 100. The cooling medium after heat exchange is discharged from the liquid outlet pipe 32, taking away the heat generated by the battery pack. After continuous circulation, the heat dissipation effect of the battery pack 100 is further improved.

[0050] The liquid inlet pipe 31 is used to input the cooling medium into the box body 2, and the liquid outlet pipe 32 is used to discharge the cooling medium after heat exchange. By respectively arranging the liquid inlet pipe 31 and the liquid outlet pipe 32 on the side walls on the opposite sides in the second direction Y, it can be ensured that the cooling medium entering the box body 2 is fully in contact with the battery module 1 and circulates heat exchange before being discharged out of the box body 2, thereby ensuring the heat dissipation effect.

[0051] In some embodiments, Figure 1 and 4 As shown, the box body 2 includes a box cover 21 and a shell 22, and the box cover 21 and the shell 22 are arranged along a third direction Z to form the box body 2; wherein the third direction Z is perpendicular to the plane where the first direction X and the second direction Y are located;

[0052] The liquid cooling pipe 3 is located between adjacent battery modules 1 on one side close to the box cover 21 , and the liquid distribution hole opens in a direction away from the box cover 21 .

[0053] The box cover 21 and the shell 22 cooperate to form the box body 2 structure, and the box cover 21 and the shell 22 are arranged along the third direction Z. The liquid cooling pipe 3 is located on the side close to the box cover 21 between the adjacent battery modules 1, and the liquid distribution hole opens in the direction away from the box cover 21. In other words, the liquid cooling pipe 3 is located in the gap between the battery modules 1 and is located at the upper part of the gap, and the opening direction of the liquid distribution hole in the liquid cooling pipe 3 is downward.

[0054] Therefore, the cooling medium entering the liquid cooling pipe 3 from the liquid inlet pipe 31 can flow downward into the battery modules 1 through the liquid distribution holes. On the basis of continuously inputting new cooling medium through the liquid inlet pipe 31, the cooling medium contacts various parts of the battery module 1 and realizes good circulation, thereby further improving the heat dissipation effect.

[0055] In some embodiments, Figure 3 As shown, the liquid inlet pipe 31 is located at one end of the side wall of the shell 22 close to the box cover 21 , and the liquid outlet pipe 32 is located at one end of the side wall of the shell 22 away from the box cover 21 .

[0056] That is, the liquid inlet pipe 31 is located at the upper part of the side wall of the shell 22, and the liquid outlet pipe 32 is located at the lower part of the side wall of the shell 22. The liquid inlet pipe 31 located at the upper part inputs the cooling medium into the liquid cooling pipe 3, and the cooling medium flows from top to bottom through the liquid distribution holes on the liquid cooling pipe 3, and exchanges heat with the battery module 1. After heat exchange and circulation, the cooling medium is finally discharged through the liquid outlet pipe 32 located at the lower part, which further ensures that the cooling medium input by the liquid inlet pipe 31 is fully in contact with and exchanges heat with the battery module 1, thereby improving the heat dissipation effect.

[0057] In some embodiments, the battery pack 100 further includes a support beam 4 , and the support beam 4 is located between the plurality of battery modules 1 and the box body 2 .

[0058] Furthermore, if Figure 1 As shown, the support beam 4 is arranged between the battery module 1 and the shell 22. The battery module 1, the support beam 4 and the shell 22 are arranged in sequence along the third direction Z. The support beam 4 is used to raise the battery module 1 so that there is a certain space between the bottom of the battery module 1 and the shell 22 to facilitate the entry of the cooling medium, so that the cooling medium is in full contact with the bottom of the battery module 1, further ensuring the heat dissipation effect of the battery module 1.

[0059] In some embodiments, Figure 1 and 4 As shown, each of the battery modules 1 includes a plurality of battery cells 11 arranged along the second direction Y, and a liquid cooling channel 121 is provided between adjacent battery cells 11 .

[0060] Liquid cooling channels 121 are provided between adjacent battery cells 11 to facilitate the flow of cooling medium between the battery cells 11 , thereby fully dissipating the heat of each battery cell 11 and improving the heat dissipation effect.

[0061] Specifically, Figure 5 As shown, a plurality of foams 12 are arranged between adjacent battery cells 11 , and the plurality of foams 12 are spaced apart along the third direction Z, and the liquid cooling channel 121 is formed between adjacent foams 12 . Figure 5 The direction indicated by the middle arrow is the flow direction of the cooling medium. The cooling medium flowing out of the liquid cooling pipe 3 first enters the gap between two adjacent battery modules 1, and then flows between the battery cells 11 through the liquid cooling channel 121 between the adjacent battery cells 11, thereby fully dissipating the heat of the battery cells 11.

[0062] Adjacent battery cells 11 are separated by foams 12, and a plurality of foams 12 are spaced apart along the third direction Z, so that liquid cooling channels 121 are formed between adjacent foams 12. The embodiment of the utility model makes full use of the foams 12 between the battery cells 11, and designs the distribution of the foams 12 to form the liquid cooling channels 121. On the basis of ensuring the gap between adjacent battery cells 11 and the buffering performance, there is no need to open additional liquid cooling channels 121.

[0063] In some embodiments, Figure 6 As shown, the battery pack 100 further includes a baffle 33;

[0064] A gap is formed between adjacent battery modules 1 , and the two baffles 33 are respectively disposed at two ends of the gap in the second direction Y.

[0065] Since the liquid cooling pipe 3 is located between adjacent battery modules 1, the cooling medium flowing out of the liquid distribution holes in the liquid cooling pipe 3 first enters the gap between adjacent battery modules 1, and the baffles 33 located at both ends of the gap in the second direction Y can block the gap, so that the cooling medium remains in the gap, and then circulates through the liquid cooling channel 121 between the battery cells 11 and the space at the bottom of the battery module 1, ensuring that the cooling medium is in full contact with the battery module 1, thereby improving the heat dissipation effect.

[0066] The baffle 33 may be a foam baffle, which may be connected to the liquid cooling pipe 3. A connector may be provided on the liquid cooling pipe 3, which is connected to the adjacent battery module 1, so as to fix the position of the liquid cooling pipe 3 and the baffle 33, thereby improving the stability of the structure.

[0067] In some embodiments, Figure 1-3 As shown, the battery pack 100 further includes a low-voltage electrical compartment 221 , and the low-voltage electrical compartment 221 is disposed outside the box body 2 .

[0068] Low-voltage electrical components 2211 such as BMS (battery management system) have low heat dissipation requirements and can be placed in a low-voltage electrical compartment 221 outside the box body 2 without direct contact with the cooling medium. While ensuring the heat dissipation capability, there is no need to waterproof these low-voltage electrical components 2211, thereby reducing the process difficulty and cost.

[0069] In some embodiments, an explosion-proof valve 211 is further provided on the box cover 21. When thermal runaway occurs in the battery pack 100, the depressurized gas can be discharged to the outside of the box body 2 in time through the explosion-proof valve 211, thereby improving the thermal safety of the battery pack 100.

[0070] In some embodiments, Figure 1As shown, the battery pack 100 also includes a liquid level gauge 222, which is arranged on the shell 22. The liquid level gauge 222 can monitor the liquid level of the cooling medium in the box 2, and adjust the flow rate of the cooling medium according to the liquid level, so that the battery module 1 can be immersed in the cooling medium to ensure the heat dissipation effect.

[0071] In a second aspect, the utility model provides an energy storage system 200, such as Figure 7 As shown, the battery pack 100 as described above is included.

[0072] It should be understood that the energy storage system 200 may include one battery pack 100 or may include multiple battery packs 100. Figure 7 It is only a schematic diagram of the energy storage system 200 and is not intended to limit the number of battery packs 100 in the energy storage system 200 .

[0073] By applying the above-mentioned battery pack 100 to the energy storage system 200, since the battery pack 100 adopts an immersion liquid cooling method, the thermal safety of the energy storage system 200 can be improved, and the risks caused by thermal runaway and heat spread of the battery pack 100 can be effectively reduced. It also ensures the normal operation of the energy storage system 200 under harsh working conditions, thereby improving the performance of the energy storage system 200.

[0074] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for technicians in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A battery pack, characterized in that: include: Multiple battery modules and boxes; The box body is provided with a accommodating cavity; A plurality of battery modules are distributed in the accommodating cavity at intervals along a first direction; A liquid cooling pipe is provided between adjacent battery modules, and the liquid cooling pipe extends along a second direction; wherein the second direction intersects with the first direction; A liquid distribution hole is formed in the portion of the liquid cooling pipe located in the box body, and the liquid distribution hole is communicated with the accommodating cavity.

2. The battery pack according to claim 1, characterized in that: The battery pack also includes a liquid inlet pipe and a liquid outlet pipe; The liquid inlet pipe and the liquid outlet pipe are respectively arranged on the side walls of the box body on two opposite sides in the second direction; one end of the liquid cooling pipe is connected to the liquid inlet pipe, and the other end is closed.

3. The battery pack according to claim 2, characterized in that: The box body comprises a box cover and a shell, and the box cover and the shell are arranged along a third direction to form the box body; wherein the third direction is perpendicular to the plane where the first direction and the second direction are located; The liquid cooling pipe is located between adjacent battery modules on one side close to the box cover, and the liquid distribution hole opens in a direction away from the box cover.

4. The battery pack according to claim 3, characterized in that: The liquid inlet pipe is located at one end of the shell side wall close to the box cover, and the liquid outlet pipe is located at one end of the shell side wall away from the box cover.

5. The battery pack according to any one of claims 1 to 4, characterized in that: The battery pack further includes a support beam, and the support beam is located between the plurality of battery modules and the box body.

6. The battery pack according to claim 3 or 4, characterized in that: Each of the battery modules includes a plurality of battery cells arranged along the second direction, and a liquid cooling channel is provided between adjacent battery cells.

7. The battery pack according to claim 6, characterized in that: A plurality of foams are arranged between adjacent battery cells, the plurality of foams are distributed at intervals along the third direction, and the liquid cooling channel is formed between adjacent foams.

8. The battery pack according to claim 2, characterized in that: The battery pack also includes a baffle; A gap is formed between adjacent battery modules, and the two baffles are respectively arranged at two ends of the gap in the second direction.

9. The battery pack according to any one of claims 1 to 4, characterized in that: The battery pack also includes a low-voltage electrical compartment, which is arranged outside the box body.

10. An energy storage system, characterized in that: Comprising a battery pack as described in any one of claims 1 to 9.

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