Energy storage battery cluster

Abstract

The utility model discloses an energy storage battery cluster, and particularly relates to the technical field of lithium batteries. The energy storage battery cluster comprises a frame and a plurality of battery modules, the frame is provided with an air inlet, an air inlet duct and an air guide duct which are communicated in sequence, a plurality of containing positions are formed in the frame, and the air inlet is suitable for being externally connected with refrigeration equipment; the air inlet channel comprises a first air inlet channel, a second air inlet channel and a third air inlet channel, and the end faces of the ends, away from the air guide channel, of the first air inlet channel, the second air inlet channel and the third air inlet channel jointly form an air inlet. The plurality of battery modules are arranged on the plurality of accommodating positions in a one-to-one manner; each battery module is provided with a heat dissipation air duct communicated with the air guide duct and an air outlet communicated with the heat dissipation air duct; according to the utility model, the air duct structure of the battery cluster is improved, and the temperature uniformity and the heat dissipation capability are effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to an energy storage battery cluster. Background Art

[0002] As energy shortages and environmental pollution become increasingly serious, new energy generation will gradually develop from auxiliary energy and supplementary energy to dominant energy and alternative energy. The fundamental feature of the power system is real-time balance, but a fatal weakness of new energy such as wind power and photovoltaics is that they are highly intermittent and volatile. Energy storage technology has become a better solution and has become a hot topic in international and domestic related industry research.

[0003] Energy storage power stations are composed of a large number of lithium-ion cells and supporting facilities. Lithium-ion batteries generate heat during operation. If this heat is not released in time, it will cause heat accumulation, which can easily lead to thermal runaway of the battery, combustion or explosion, and threaten the safety of the energy storage system. In addition, the temperature characteristics of the battery will also affect the discharge characteristics, such as cycle life and discharge capacity. The highly concentrated distribution of cells also greatly increases the difficulty of temperature management. The temperature difference between cells in the energy storage system is large, and the temperature of individual cells is too high. The battery cluster is the core component that carries the cells in the energy storage system. Its thermal management performance determines the reliability and service life of the energy storage system.

[0004] Air cooling is widely used in energy storage containers. The battery cluster generally takes in air from the primary air duct on the top, and the cooling air enters each battery module from the secondary air ducts on both sides and in the middle. After cooling the cells in each module, the air is finally discharged from the outlet of each battery module. In order to save manufacturing costs and reduce the difficulty of manufacturing processes, the air duct structure of conventional air-cooled battery clusters is relatively simple and direct, and has the disadvantage of uneven distribution of cooling capacity. Utility Model Content

[0005] The main purpose of the utility model is to provide an energy storage battery cluster, aiming to improve the uniformity of cold distribution of the energy storage battery cluster and enhance the heat dissipation capacity.

[0006] To achieve the above objectives, the utility model provides an energy storage battery cluster, comprising:

[0007] The frame is provided with an air inlet, an air inlet duct and an air guide duct which are connected in sequence, the frame is formed with a plurality of accommodating positions, and the air inlet is suitable for connecting an external refrigeration device;

[0008] Wherein, the air inlet duct comprises a first air inlet flow channel, a second air inlet flow channel and a third air inlet flow channel, and end surfaces of the first air inlet flow channel, the second air inlet flow channel and the third air inlet flow channel away from the air guide duct together form the air inlet; and

[0009] A plurality of battery modules are arranged one-to-one on the plurality of accommodating positions, and each of the battery modules is provided with a heat dissipation duct communicated with the air guide duct and an air outlet communicated with the heat dissipation duct.

[0010] Optionally, an area ratio of an end surface of the first air inlet flow channel, the second air inlet flow channel, and the third air inlet flow channel away from the air guide channel is 1:2:1.

[0011] Optionally, the frame includes a frame body, a cover plate and a plurality of inclined air guide plates, the plurality of inclined air guide plates are spaced apart on the top of the frame body, the cover plate is covered on the plurality of inclined air guide plates, and the frame body, the cover plate and the plurality of inclined air guide plates are arranged to form the first air inlet duct, the second air inlet duct and the third air inlet duct.

[0012] Optionally, the first air inlet duct and the third air inlet duct both include a guide section and a connecting section connected to the guide section, the guide section is used to guide the cooling gas to the side of the frame, and the connecting section is connected to the air guide duct located on the side of the frame.

[0013] Optionally, the width of the second air inlet flow channel increases gradually first and then decreases gradually.

[0014] Optionally, an air equalizing plate extending along the height direction of the frame is provided in the air guide duct, the air equalizing plate constitutes the side wall of the accommodating position, a plurality of air equalizing holes are provided on the air equalizing plate, and the battery modules are each provided with a plurality of harmonica tubes, and the plurality of air equalizing holes are arranged in a one-to-one correspondence with the plurality of harmonica tubes.

[0015] Optionally, heat exchange fins are provided on at least part of the accommodation positions.

[0016] Optionally, the heat exchange fins include a heat exchange plate and a plurality of fins arranged on the heat exchange plate.

[0017] Optionally, the number of the fins is 39 to 59; and / or the height of the fins is 10 to 15 mm.

[0018] Optionally, the heat exchange plate and the fins are bonded and fixed by using a heat conductive structural adhesive.

[0019] In the technical solution of the utility model, the energy storage battery cluster includes a frame and a plurality of battery modules; the frame is provided with an air inlet, an air inlet duct and an air guide duct which are connected in sequence, the frame is formed with a plurality of accommodation positions, and the air inlet is suitable for an external refrigeration device; wherein the air inlet duct includes a first air inlet channel, a second air inlet channel and a third air inlet channel, and the end faces of the first air inlet channel, the second air inlet channel and the third air inlet channel away from the air guide duct jointly form an air inlet; a plurality of battery modules are arranged one-to-one on a plurality of accommodation positions, and each battery module is provided with a heat dissipation duct connected to the air guide duct and an air outlet connected to the heat dissipation duct. It can be understood that by arranging a plurality of different air inlet ducts in the air inlet duct, different air volumes can be allocated, and the structural features can be used to allocate more cooling air to the air inlet duct corresponding to the middle of the battery cluster, so as to meet the need of the middle air guide duct to dissipate heat to the battery modules on both sides thereof, which is conducive to reducing the overall temperature difference of the battery cluster. The utility model distributes the cooling air reasonably from the inlet, and makes the cooling air flow more evenly from the primary air duct into the secondary air duct, thereby improving the uniformity of the cold distribution of the energy storage battery cluster and thus improving the heat dissipation capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1 This is a schematic structural diagram of an embodiment of the energy storage battery cluster of the utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the frame in one embodiment of the energy storage battery cluster of the utility model;

[0023] Figure 3 An exploded view of a frame in an embodiment of an energy storage battery cluster of the utility model;

[0024] Figure 4 This is a schematic diagram of the structure of the air inlet duct in one embodiment of the energy storage battery cluster of the utility model;

[0025] Figure 5 This is a schematic diagram of the structure of a battery module in an embodiment of an energy storage battery cluster of the utility model;

[0026] Figure 6 This is a schematic diagram of the structure of the wind distribution plate in one embodiment of the energy storage battery cluster of the utility model;

[0027] Figure 7It is a schematic structural diagram of the heat exchange fins in one embodiment of the energy storage battery cluster of the utility model.

[0028] Description of Figure Numbers:

[0029] 10. Frame; 20. Battery module; 30. Control module; 10a. Air inlet; 10c. Air guide duct; 10b1. First air inlet channel; 10b2. Second air inlet channel; 10b3. Third air inlet channel; 20a. Heat dissipation duct; 20b. Air outlet; 11. Frame; 12. Cover plate; 13. Oblique air guide plate; 111. First side plate; 112. Second side plate; 113. Fixing frame; 14. Air balancing plate; 14a. Air balancing hole; 21. Battery cell; 15. Heat exchange fins; 151. Heat exchange plate; 152. Fins.

[0030] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0031] 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, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 indirectly connected 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 according to specific circumstances.

[0034] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0035] The utility model provides an energy storage battery cluster.

[0036] Reference Figures 1 to 5 In one embodiment of the utility model, the energy storage battery cluster includes a frame 10 and a plurality of battery modules 20; the frame 10 is provided with an air inlet 10a, an air inlet duct and an air guide duct 10c which are connected in sequence, and the frame 10 is formed with a plurality of accommodating positions, and the air inlet 10a is suitable for an external air conditioner or other refrigeration equipment. Figure 4 As shown, the air inlet passage includes a first air inlet passage 10b1, a second air inlet passage 10b2 and a third air inlet passage 10b3, and the end surfaces of the first air inlet passage 10b1, the second air inlet passage 10b2 and the third air inlet passage 10b3 away from the air guide passage 10c together form an air inlet 10a. Figure 1 As shown, a plurality of battery modules 20 are arranged one-to-one on a plurality of accommodation positions, and each battery module 20 is provided with a heat dissipation duct 20a communicating with the air guide duct 10c and an air outlet 20b communicating with the heat dissipation duct 20a.

[0037] In this embodiment, the frame 10 may be composed of a frame body 11, a cover plate 12, a plurality of inclined air guide plates 13, etc. Among them, the frame body 11 mainly includes a first side plate 111, a second side plate 112, and a fixing frame 113 forming a plurality of accommodating positions. A plurality of inclined air guide plates 13 are arranged at intervals on the top of the frame body 11, and the cover plate 12 is covered on the plurality of inclined air guide plates 13. The frame body 11, the cover plate 12, and the plurality of inclined air guide plates 13 are arranged to form a first air inlet flow channel 10b1, a second air inlet flow channel 10b2, and a third air inlet flow channel 10b3. The corresponding air guide duct 10c may also be set to 3 flow channels, which is not limited here.

[0038] Reference Figure 1 and Figure 5The battery module 20 may include a battery cell 21, a bottom plate, a side plate, an air guide plate (harmonica tube) having a heat dissipation duct 20a, a top plate, etc., which are not limited here.

[0039] The air inlet duct constitutes the primary duct of the energy storage battery cluster, the air guide duct 10c constitutes the secondary duct, and the heat dissipation duct 20a of the battery module 20 (formed by the harmonica tube / air guide plate, etc.) constitutes the tertiary duct.

[0040] It should be noted that the fixing frame 113 in the energy storage battery cluster generally has 15 or 17 battery modules 20 symmetrically placed in two rows, and the remaining position is equipped with a battery control module 30, which is electrically connected to the battery cell 21. There are air ducts on the upper side, side and inside of the battery module 20. The air ducts 10c located on both sides can be formed by the side of the battery module 20 and the side plate of the frame 11, and the air duct 10c located in the middle can be formed by the side of the two rows of battery modules 20 facing each other.

[0041] Since two groups of battery modules 20 are arranged in the frame 10, the middle air guide duct 10c corresponds to the side of the two groups of battery modules 20, and the heat in the middle area is relatively large. Therefore, in order to ensure the overall temperature difference of the energy storage battery cluster, the corresponding second air inlet duct 10b2 needs to introduce more cooling air. Preferably, the end surface area ratio of the first air inlet duct 10b1, the second air inlet duct 10b2 and the third air inlet duct 10b3 away from the air guide duct 10c can be set to 1:2:1, so that the middle air guide duct 10c is allocated with sufficient cooling gas, thereby effectively reducing the temperature of the area between the two groups of battery modules 20, helping to improve the uniformity of the cold distribution of the energy storage battery cluster, thereby improving the heat dissipation capacity.

[0042] It can be understood that the utility model can distribute different air volumes by setting a plurality of different air inlet ducts in the air inlet duct, and utilize the structural characteristics to distribute more cooling air to the air inlet duct corresponding to the middle of the battery cluster, so as to meet the need of the middle air guide duct 10c to dissipate heat for the battery modules 20 on both sides thereof, which is conducive to reducing the overall temperature difference of the energy storage battery cluster. The utility model reasonably distributes the air volume of the cooling air from the inlet, and at the same time makes the cooling air flow more evenly from the primary air duct into the secondary air duct, thereby improving the uniformity of the cold distribution of the energy storage battery cluster, thereby improving the heat dissipation capacity.

[0043] In order to make the cooling air flow to the air guide ducts 10c on both sides according to the predetermined trajectory to further improve the heat dissipation efficiency, the main reference is Figure 3 and Figure 4In one embodiment, the first air inlet duct 10b1 and the third air inlet duct 10b3 may include a guide section and a connecting section connected to the guide section, the guide section is used to guide the cooling gas to the side of the frame 10, and the connecting section is connected to the air guide duct 10c located on the side of the frame 10.

[0044] In this embodiment, in order to allow the cooling gas to enter the middle air duct 10c more quickly to cool the end surfaces of the two rows of battery modules 20 and further improve the heat dissipation efficiency, the duct width of the second air inlet channel 10b2 may gradually increase and then gradually decrease.

[0045] To further improve the uniformity of cooling gas distribution and further reduce the overall temperature difference of the energy storage battery cluster, please combine Figure 3 , Figure 5 and Figure 6 In one embodiment, an air balancing plate 14 extending along the height direction of the frame 10 is provided in the air guide duct 10c, the air balancing plate 14 constitutes the side wall of the accommodating position, and a plurality of air balancing holes 14a are provided on the air balancing plate 14. The battery modules 20 are each provided with a plurality of harmonica tubes, and the plurality of air balancing holes 14a are arranged one-to-one correspondingly to the plurality of harmonica tubes.

[0046] In the secondary air duct, the air balancing holes 14a of the air balancing plate 14 are optimized so that each air balancing hole 14a is aligned with the corresponding harmonica tube (wind guide plate) in the battery module 20 to reduce flow resistance loss and allow cooling air to flow more easily into the harmonica tube of the battery module 20 through the heat dissipation air duct 20a.

[0047] The cooling gas flow trajectory is that the cooling gas in the primary air duct flows into the secondary air duct, and then enters the tertiary air duct in each battery module 20 from the air equalizing plate 14 in the secondary air duct, cools the battery cell 21 in the tertiary air duct, and is finally discharged from the air outlet 20b of each battery module 20.

[0048] Combination Figure 2 , Figure 5 and Figure 7 In one embodiment, at least part of the accommodation position is provided with a heat exchange fin 15. In this embodiment, the heat exchange fin 15 includes a heat exchange plate 151 and a plurality of fins 152 arranged on the heat exchange plate 151. The number of the fins 152 can be 39 to 59, and the height of a single fin 152 can be set to 10 to 15 mm, which is not limited here.

[0049] The heat exchange plate 151 and the fins 152 can be bonded and fixed by means of a heat conductive structural adhesive. Applying the heat conductive structural adhesive can ensure that the heat generated by the battery cell 21 can be smoothly transferred to the heat exchange fins 15 for heat dissipation.

[0050] During the heat dissipation process, due to a certain flow resistance in the secondary air duct, as the cooling air flows toward the battery module 20 below the energy storage battery cluster, the amount of cooling obtained by the battery module 20 below will become smaller and smaller, so that the closer to the battery module 20 below, the higher the temperature will be. Therefore, adding heat exchange fins 15 to the bottom of the battery module 20 located in the lower half of the battery cluster can improve the heat exchange efficiency between the battery module 20 below and the cooling air, thereby reducing the temperature of the battery cell 21 of the lower module and reducing the overall temperature difference.

[0051] In summary, the utility model can effectively reduce the overall temperature difference of the energy storage battery cluster by optimizing the design of the air duct structure, improve the temperature equalization capability, and increase the cooling efficiency.

[0052] The above description is only an optional embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An energy storage battery cluster, characterized in that: include: The frame is provided with an air inlet, an air inlet duct and an air guide duct which are connected in sequence, the frame is formed with a plurality of accommodating positions, and the air inlet is suitable for connecting an external refrigeration device; Wherein, the air inlet duct comprises a first air inlet flow channel, a second air inlet flow channel and a third air inlet flow channel, and end surfaces of the first air inlet flow channel, the second air inlet flow channel and the third air inlet flow channel away from the air guide duct together form the air inlet; and A plurality of battery modules are arranged one-to-one on the plurality of accommodating positions, and each of the battery modules is provided with a heat dissipation duct communicated with the air guide duct and an air outlet communicated with the heat dissipation duct.

2. The energy storage battery cluster according to claim 1, characterized in that: The area ratio of the end surfaces of the first air inlet flow channel, the second air inlet flow channel and the third air inlet flow channel away from the air guide channel is 1:2:

1.

3. The energy storage battery cluster according to claim 2, characterized in that: The frame includes a frame body, a cover plate and a plurality of inclined air guide plates, the plurality of inclined air guide plates are spaced apart on the top of the frame body, the cover plate is covered on the plurality of inclined air guide plates, and the frame body, the cover plate and the plurality of inclined air guide plates are arranged to form the first air inlet flow channel, the second air inlet flow channel and the third air inlet flow channel.

4. The energy storage battery cluster according to claim 3, characterized in that: The first air inlet duct and the third air inlet duct both include a guide section and a connecting section connected to the guide section, the guide section is used to guide the cooling gas to the side of the frame, and the connecting section is connected to the air guide duct located on the side of the frame.

5. The energy storage battery cluster according to claim 4, characterized in that: The width of the second air inlet flow channel gradually increases first and then decreases.

6. The energy storage battery cluster according to claim 1, characterized in that: An air balancing plate extending along the height direction of the frame is provided in the air guide duct, the air balancing plate constitutes the side wall of the accommodating position, a plurality of air balancing holes are provided on the air balancing plate, and the battery modules are provided with a plurality of harmonica tubes, and the plurality of air balancing holes are arranged in a one-to-one correspondence with the plurality of harmonica tubes.

7. The energy storage battery cluster according to claim 1, characterized in that: At least part of the accommodation positions are provided with heat exchange fins.

8. The energy storage battery cluster according to claim 7, characterized in that: The heat exchange fins include a heat exchange plate and a plurality of fins arranged on the heat exchange plate.

9. The energy storage battery cluster according to claim 8, characterized in that: The number of the fins is 39 to 59; and / or the height of the fins is 10 to 15 mm.

10. The energy storage battery cluster according to claim 8, characterized in that: The heat exchange plate and the fin are bonded and fixed by heat conductive structural adhesive.

Images