Submersible battery pack

Abstract

The utility model provides a kind of submerged battery package, comprising: shell, with cooling liquid flow cavity, shell also has respectively with the liquid inlet and liquid outlet of cooling liquid flow cavity intercommunication, cooling liquid flow cavity is used for the cooling liquid flow;Single battery is provided with multiple, multiple single battery is side by side arranged in cooling liquid flow cavity along the extension direction of shell;Buffering heat insulation part is arranged between two adjacent single batteries, the side of buffering heat insulation part towards single battery has flow-through groove, buffering heat insulation part and single battery abutment cooperation to make flow-through groove form flow-through channel for the cooling liquid flow, the total area of flow-through channel along the direction parallel to buffering heat insulation part is S1, the area of the profile of the side of buffering heat insulation part towards single battery is S2, and the scheme can improve the reliability of battery package.

Description

Technical Field

[0001] This utility model relates to the field of submersible battery pack technology, and more specifically, to a submersible battery pack. Background Technology

[0002] Submersible battery packs are designed to dissipate heat quickly and evenly by immersing individual cells directly in an insulating coolant that flows within the battery pack casing. The coolant's flow directly carries away the heat generated during battery pack operation.

[0003] However, after prolonged charging and discharging, individual cells in the battery pack may expand in volume, causing adjacent cells to come into direct contact and affecting the reliability of the battery pack. Utility Model Content

[0004] This invention provides a submersible battery pack to solve the problem in the prior art where, after prolonged charging and discharging, the volume expansion of individual cells may cause direct contact between adjacent cells, affecting the reliability of the battery pack.

[0005] This utility model provides an immersion battery pack, comprising: a housing having a coolant flow chamber, the housing also having an inlet and an outlet respectively communicating with the coolant flow chamber, the coolant flow chamber being used for coolant flow; multiple individual cells arranged side-by-side within the coolant flow chamber along the extension direction of the housing; and a buffer insulation section disposed between two adjacent individual cells, the buffer insulation section having a flow groove on the side facing the individual cell, the buffer insulation section abutting against the individual cell to form a flow channel for coolant flow at the flow groove, the total area of ​​the flow channel along the direction parallel to the buffer insulation section being S1, and the area of ​​the outline of the buffer insulation section facing the individual cell being S2.

[0006] Furthermore, multiple flow channels are provided on the same side of the buffer insulation section.

[0007] Furthermore, the buffer insulation part includes: a heat insulation plate, which is arranged parallel to the single cell; and multiple buffer sheets, which are spaced apart on the surface of the heat insulation plate facing the single cell, forming a flow groove between two adjacent buffer sheets, and the side of the buffer sheet away from the heat insulation plate abutting against the corresponding single cell.

[0008] Furthermore, both the heat insulation plate and the buffer sheet are immiscible with the coolant.

[0009] Furthermore, the insulation panel is made of nano-insulation material; and / or, the buffer sheet is made of nitrile rubber material.

[0010] Furthermore, the coefficient of expansion of the buffer sheet in the coolant is a, where a ≤ 5%.

[0011] Furthermore, the thickness of the heat insulation board is d1, 1mm≤d1≤2mm; the thickness of the buffer sheet is d2, 1mm≤d2≤3mm.

[0012] Furthermore, the multiple flow channels are parallel to each other; and / or, the multiple flow channels all extend in a straight line.

[0013] Furthermore, multiple individual batteries arranged side by side along the extension direction of the casing form a battery module, and both ends of the flow channel are open structures; there are two battery modules, which are distributed at intervals along the width direction of the casing. Along the extension direction of the casing, the sidewall of the casing and the corresponding battery module form a first flow channel, and two adjacent battery modules form a second flow channel; one end of the flow channel is connected to the second flow channel, and the other end is connected to the corresponding first flow channel.

[0014] Furthermore, the liquid inlet and liquid outlet are located at opposite ends of the housing extension direction, with the liquid inlet connected to the second flow channel; a drain channel is formed between the end of the battery module near the liquid outlet and the housing, with one end of the drain channel connected to the first flow channel and the other end connected to the liquid outlet.

[0015] Furthermore, the submersible battery pack also includes: a flow guide tube disposed at the top of the second flow channel, the flow guide tube extending in the same direction as the second flow channel, one end of the flow guide tube being connected to the liquid inlet pipe, and multiple flow equalization ports disposed at the bottom of the flow guide tube, the multiple flow equalization ports being distributed at intervals along the extension direction of the flow guide tube, and all multiple flow equalization ports being connected to the second flow channel.

[0016] Furthermore, the orthographic projection of a single cell onto the buffer insulation section is located inside the buffer insulation section.

[0017] The present invention employs a buffer heat insulation section disposed between adjacent individual cells, which abuts against the cells. When an individual cell expands in volume due to prolonged charging and discharging, the buffer heat insulation section acts as an insulator, preventing direct contact between adjacent cells and effectively preventing short circuits, thus improving the reliability of the battery pack. Furthermore, the buffer heat insulation section has a heat insulation function, reducing heat transfer between individual cells. When a cell experiences thermal runaway, the heat insulation section can slow the transfer of heat to adjacent cells, preventing the spread of thermal runaway to the entire battery pack, reducing the safety risks caused by thermal runaway, and ensuring the safe operation of the battery pack. The side of the buffer heat insulation section facing the individual cell has a flow groove, which, after abutting against the cell, forms a flow channel for coolant circulation. This structural design ensures smooth flow of coolant between adjacent cells, preventing the buffer heat insulation section from obstructing coolant flow, ensuring sufficient contact between the coolant and the individual cells, thereby achieving rapid and uniform heat dissipation. Furthermore, the total area of ​​the flow channel along the direction parallel to the buffer insulation part is S1, and the area of ​​the outline of the buffer insulation part facing the single cell is S2. If the total area of ​​the flow channel along the direction parallel to the buffer insulation is small, the heat exchange area between the coolant and the individual battery cells is too small, resulting in low heat dissipation efficiency. Conversely, if the total area of ​​the flow channel along the direction parallel to the buffer insulation is too large, the flow velocity of the coolant along the flow channel is too low, and the heat generated by the individual battery cells during charging and discharging cannot be effectively and promptly transferred to the coolant and carried away, leading to low heat dissipation efficiency. This solution sets the ratio of the total area of ​​the flow channel along the direction parallel to the buffer insulation to the area of ​​the outline of the buffer insulation on the side facing the individual battery within the aforementioned range, ensuring the heat dissipation efficiency of the coolant. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, 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 undue limitation of the present invention. In the drawings:

[0019] Figure 1 A schematic diagram of the structure of the battery module provided by this utility model is shown;

[0020] Figure 2 This invention provides a schematic diagram of a first partial structure of the battery module.

[0021] Figure 3 A schematic diagram of the structure of the buffer and heat insulation part provided by this utility model is shown;

[0022] Figure 4This invention provides a schematic diagram of a second partial structure of the buffer and heat insulation part.

[0023] Figure 5 A first-view structural schematic diagram of a partial structure of the battery pack provided by this utility model is shown.

[0024] Figure 6 A second-view structural schematic diagram of a partial structure of the battery pack provided by this utility model is shown;

[0025] Figure 7 This is a third-view structural schematic diagram showing a partial structure of the battery pack provided by this utility model.

[0026] The above figures include the following reference numerals:

[0027] 10. Housing; 101. Coolant flow chamber; 102. Inlet; 1021. Inlet pipe; 103. Outlet; 1031. Outlet pipe;

[0028] 104. First flow channel; 105. Second flow channel; 106. Drainage channel;

[0029] 20. Single cell battery;

[0030] 30. Buffer and heat insulation section; 301. Flow channel;

[0031] 31. Heat insulation board; 32. Buffer sheet;

[0032] 40. Drainage pipe. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0034] like Figures 1 to 7As shown, this utility model embodiment provides an immersion battery pack, which includes a housing 10, individual batteries 20, and a buffer and heat insulation part 30. The housing 10 includes a coolant flow chamber 101 for supplying coolant. The housing 10 also has an inlet 102 and an outlet 103 connected to the coolant flow chamber 101. An inlet pipe 1021 is provided at the inlet 102, and an outlet pipe 1031 is provided at the outlet 103. Multiple individual batteries 20 are arranged side-by-side within the coolant flow chamber 101 along the extending direction of the housing 10. A buffer / heat insulation section 30 is disposed between two adjacent individual batteries 20. The side of the buffer / heat insulation section 30 facing the individual battery 20 has a flow groove 301. The buffer / heat insulation section 30 abuts against the individual battery 20 to form a flow channel for coolant flow at the flow groove 301. The total area of ​​the flow channel along the direction parallel to the buffer / heat insulation section 30 is S1, and the area of ​​the outline of the side of the buffer / heat insulation section 30 facing the individual battery 20 is S2.

[0035] Applying the technical solution of this utility model, the buffer heat insulation part 30 is disposed between adjacent individual cells 20, and it abuts against the individual cells 20. When the individual cells 20 expand in volume due to prolonged charging and discharging, the buffer heat insulation part 30 can act as an isolation, preventing direct contact between adjacent individual cells 20, thereby effectively preventing short circuits between batteries and improving the reliability of the battery pack. Furthermore, the buffer heat insulation part 30 has a heat insulation function, which can reduce heat transfer between individual cells 20. When a single cell 20 experiences thermal runaway, the buffer heat insulation part 30 can slow down the transfer of heat to adjacent individual cells 20, preventing thermal runaway from spreading to the entire battery pack, reducing the safety risks caused by thermal runaway, and ensuring the safe operation of the battery pack. The side of the buffer heat insulation part 30 facing the individual cell 20 has a flow groove 301, which forms a flow channel for coolant flow after abutting against the individual cell 20. This structural design ensures that the coolant can flow smoothly between adjacent individual cells 20, avoiding obstruction of coolant flow due to the setting of the buffer insulation part 30, and ensuring full contact between the coolant and the individual cells 20, thereby achieving a fast and uniform heat dissipation effect.

[0036] Furthermore, the total area of ​​the flow channel along the direction parallel to the buffer insulation part 30 is S1, and the area of ​​the outline of the buffer insulation part 30 facing the single cell 20 is S2. If the total area of ​​the flow channel along the direction parallel to the buffer insulation part 30 is small, the heat exchange area between the coolant and the individual battery 20 will be too small, resulting in low heat dissipation efficiency. If the total area of ​​the flow channel along the direction parallel to the buffer insulation part 30 is too large, the flow velocity of the coolant along the flow channel will be too low, and the heat generated by the individual battery 20 during charging and discharging cannot be effectively and timely transferred to the coolant and carried away, resulting in low heat dissipation efficiency. This solution sets the ratio of the total area of ​​the flow channel along the direction parallel to the buffer insulation part 30 to the area of ​​the contour of the side of the buffer insulation part 30 facing the individual battery 20 within the above-mentioned range, which can ensure the heat dissipation efficiency of the coolant.

[0037] in, It can be set to 0.3, 0.4, 0.5, or 0.6, etc.

[0038] In this embodiment, multiple flow channels 301 are provided on the same side of the buffer insulation part 30. This arrangement allows the coolant to be distributed more evenly around the individual battery 20, reducing or avoiding localized overheating problems caused by uneven coolant flow. Furthermore, the above arrangement creates multiple different contact areas between the buffer insulation part 30 and the individual battery 20, making the contact between them more uniform and improving the buffering effect of the buffer insulation part 30 on the individual battery 20.

[0039] It is understood that multiple flow channels are formed between the buffer insulation part 30 and the two adjacent single cells 20. The total area of ​​the multiple flow channels on the same side along the direction parallel to the single cell 20 is S1.

[0040] like Figure 1 As shown, the submersible battery pack has a length direction, a width direction, and a height direction. The length direction of the submersible battery pack is the X-direction, the width direction is the Y-direction, and the height direction is the Z-direction. (Combined with...) Figure 2 and Figure 3 The buffer and heat insulation part 30 extends along the width direction of the submerged battery pack.

[0041] In this embodiment, the area of ​​each flow channel along the direction parallel to the single cell 20 is the area of ​​the cross-section of the corresponding flow groove 301 along the direction parallel to the single cell 20. For example, if the length of each flow groove 301 is L1 and the width is L2, the area S0 of the cross-section of a single flow groove 301 along the direction parallel to the single cell 20 is L1×L2. If the buffer heat insulation part 30 has N flow grooves 301 on the same side, then the total area of ​​the multiple flow grooves 301 on the same side along the direction parallel to the single cell 20 is N×S0, that is, S1=N×S0.

[0042] In this embodiment, the outline of the buffer heat insulation part 30 is approximately rectangular, the length dimension of the outline of the buffer heat insulation part 30 is L1, the width dimension of the outline of the buffer heat insulation part 30 is L3, and the area S2 of the outline of the buffer heat insulation part 30 facing the single cell 20 is L1×L3.

[0043] Specifically, the buffer insulation section 30 includes a heat insulation plate 31 and buffer sheets 32. The heat insulation plate 31 is arranged parallel to the individual battery cell 20. Multiple buffer sheets 32 are spaced apart on the surface of the heat insulation plate 31 facing the individual battery cell 20, forming a flow groove 301 between adjacent buffer sheets 32. The side of the buffer sheet 32 ​​away from the heat insulation plate 31 abuts against the corresponding individual battery cell 20. The parallel arrangement of the heat insulation plate 31 with the individual battery cell 20 effectively reduces heat transfer between adjacent individual batteries 20, and the heat insulation plate 31 provides structural support, maintaining the overall shape and stability of the buffer insulation section 30. The spaced buffer sheets 32 on the surface of the heat insulation plate 31 facing the individual battery cell 20 effectively absorb the force generated by the volume expansion of the individual battery cell 20 during charging and discharging. The buffer sheets 32 provide good buffering effect, preventing direct contact between adjacent individual batteries 20, thereby improving the reliability of the battery pack.

[0044] It is understandable that the heat insulation portion 30 located between the two individual cells 20 has multiple buffer plates 32 on both surfaces of the heat insulation plate 31 facing the two individual cells 20. The design of the double-sided buffer plates 32 makes the structure of the heat insulation portion 30 more symmetrical.

[0045] In this embodiment, both the heat insulation plate 31 and the buffer sheet 32 ​​are immiscible with the coolant. It is understood that the heat insulation plate 31 and the buffer sheet 32 ​​will not undergo a chemical reaction or degradation upon contact with the coolant. This ensures that the heat insulation plate 31 and the buffer sheet 32 ​​maintain their physical and chemical properties during long-term use, thus ensuring the buffering and heat insulation effect of the buffer insulation part 30.

[0046] Specifically, the heat insulation plate 31 is made of nano-insulating material. Nano-insulating material has excellent heat insulation performance and low density, which significantly reduces the weight of the heat insulation plate 31, thus enabling a lighter battery pack. Specifically, the heat insulation plate 31 can be made of nano-sized silicon dioxide and nano-sized silicon carbide.

[0047] Furthermore, the buffer sheet 32 ​​is made of nitrile rubber. This material not only possesses high elasticity, oil resistance, and heat resistance, but also excellent insulation properties, thus extending the service life of the buffer sheet 32.

[0048] In this embodiment of the solution, the buffer sheet 32 ​​is attached to the heat insulation plate 31.

[0049] In this embodiment, the coefficient of expansion of the buffer sheet 32 ​​in the coolant is α, where α ≤ 5%. When the coefficient of expansion of the buffer sheet 32 ​​is too large, its volume expands significantly when the coolant temperature changes. This may result in excessive expansion force of the buffer sheet 32 ​​during battery pack operation. Excessive expansion force may exert excessive pressure on the individual battery cells 20, affecting the normal operation of the battery, and may even cause battery deformation or damage. Furthermore, the expansion of the buffer sheet 32 ​​may cause the flow channel 301 to narrow, reducing the heat exchange efficiency between the coolant and the individual battery cells 20, resulting in a decrease in heat dissipation.

[0050] The coefficient of expansion of the buffer plate 32 in the coolant can be specifically set to 1%, 3%, or 5%, etc.

[0051] like Figure 4 As shown in the embodiment of this solution, the thickness of the heat insulation plate 31 is d1, where 1mm ≤ d1 ≤ 2mm. The use of nano-insulation material ensures that the thickness of the heat insulation plate 31 within the aforementioned range provides good heat insulation performance. Furthermore, if the thickness of the heat insulation plate 31 is too thin, its structural strength will be low, and the stability of the buffer insulation part 30 within the battery pack will be low; if the thickness of the heat insulation plate 31 is too thick, it will occupy too much space in the battery pack, resulting in an excessively large battery pack volume, which is not conducive to miniaturizing the battery pack design.

[0052] The thickness of the heat insulation board 31 can be specifically set to 1mm, 1.5mm or 2mm, etc.

[0053] Furthermore, the orthographic projection of the individual battery cell 20 onto the buffer heat insulation portion 30 is located within the buffer heat insulation portion 30. That is, along the direction parallel to the individual battery cell 20, the outline dimension of the heat insulation plate 31 is larger than the outline dimension of the individual battery cell 20. This arrangement can prevent direct contact between two adjacent individual batteries 20, thereby improving the safety of the battery pack.

[0054] like Figure 4 As shown, the thickness of the buffer sheet 32 ​​is d2, where 1mm ≤ d2 ≤ 3mm. The main function of the buffer sheet 32 ​​is to absorb the force generated by the volume expansion of the individual battery cell 20 during charging and discharging. If the thickness of the buffer sheet 32 ​​is too small, its ability to absorb the expansion force will be significantly reduced, which may result in insufficient buffering for the individual battery cell 20 during volume expansion. Insufficient thickness of the buffer sheet 32 ​​may also lead to insufficient fit between it and the heat insulation plate 31, thus affecting the flow of coolant. This may result in uneven distribution of coolant within the battery pack, with insufficient heat dissipation in some areas of the individual battery cell 20 and excessive heat dissipation in other areas.

[0055] The thickness of the buffer sheet 32 ​​can be specifically set to 1mm, 2mm or 3mm, etc.

[0056] Furthermore, multiple flow channels 301 are parallel to each other, and all of them extend in a straight line. The multiple parallel and straight-lined flow channels 301 reduce the resistance of the coolant during flow, and the straight-line design avoids complex curved paths, allowing the coolant to flow more smoothly and thus increasing its flow rate. In addition, this design reduces the temperature gradient of the coolant within the battery pack, thereby reducing the temperature difference between individual cells 20 at different locations within the battery pack and improving the temperature uniformity of the battery pack.

[0057] It is understandable that the buffer sheet 32 ​​is a straight strip structure, with multiple buffer sheets 32 spaced apart and arranged in parallel. This arrangement ensures that the multiple buffer sheets 32 provide a uniform buffering effect for the corresponding multiple individual cells 20, ensuring that the individual cells 20 are more securely fixed within the battery pack, reducing battery displacement caused by vibration or external impact, and improving the structural stability of the battery pack.

[0058] In this embodiment, the number of buffer sheets 32 can be set to 3-5. Multiple buffer sheets 32 are spaced apart and arranged in parallel along the height direction of the battery pack. Each buffer sheet 32 ​​extends along the width direction of the battery pack, and the two ends of the extension direction of the buffer sheet 32 ​​are flush with the two ends of the heat insulation plate 31 along the width direction of the battery pack.

[0059] Combination Figures 5 to 7 As shown, multiple individual batteries 20 arranged side-by-side along the extension direction of the housing 10 form a battery module, with both ends of the flow channel having an open structure. Two battery modules are provided, spaced apart along the width direction of the housing 10. A first flow channel 104 is formed between the sidewall of the housing 10 and the corresponding battery module along the extension direction of the housing 10, and a second flow channel 105 is formed between two adjacent battery modules. One end of each flow channel is connected to the second flow channel 105, and the other end is connected to the corresponding first flow channel 104. This arrangement allows the coolant flowing into the coolant flow chamber 101 to enter the flow channel through the second flow channel 105, then flow to the first flow channel 104 and exit through the outlet 103, thereby achieving uniform distribution and efficient flow of the coolant. Furthermore, the coolant in the second flow channel 105 can simultaneously flow to both battery modules. This design, by centrally distributing the coolant through the second flow channel 105, reduces redundant coolant channels, resulting in a more reasonable structural design, reduced battery pack size, and improved space utilization.

[0060] It is understandable that both the first flow channel 104 and the second flow channel 105 extend along the length of the battery pack.

[0061] Furthermore, the inlet 102 and outlet 103 are located at opposite ends of the extending direction of the housing 10, with the inlet 102 being higher than the outlet 103. The inlet 102 is connected to the second flow channel 105. A drain channel 106 is formed between the end of the battery module near the outlet 103 and the housing 10. One end of the drain channel 106 is connected to the first flow channel 104, and the other end is connected to the outlet 103. This arrangement is structurally reasonable. The drain channel 106 allows the coolant to flow smoothly from the first flow channel 104 into the drain channel 106 after completing its cooling task, and finally exit from the outlet 103.

[0062] Furthermore, the submersible battery pack also includes a flow guide pipe 40, which is disposed at the top of the second flow channel 105. The extension direction of the flow guide pipe 40 is the same as that of the second flow channel 105. One end of the flow guide pipe 40 is connected to the liquid inlet 102, and the bottom of the flow guide pipe 40 is provided with multiple flow equalization ports, which are spaced apart along the extension direction of the flow guide pipe 40 and are all connected to the second flow channel 105. This arrangement can improve the uniformity of coolant distribution within the second flow channel 105. In addition, the design of the flow guide pipe 40 reduces turbulence and eddies when the coolant enters the second flow channel 105, allowing the coolant to flow more smoothly.

[0063] In summary, this solution has at least the following technical advantages:

[0064] 1. The design of the buffer sheet 32 ​​and the heat insulation plate 31 can avoid mechanical contact between individual cells 20, reducing the risk of battery damage caused by mechanical collision;

[0065] 2. By designing the ratio of the total area of ​​the flow channel along the direction parallel to the buffer insulation part 30 to the area of ​​the outline of the buffer insulation part 30 facing the single cell 20, it is possible to simultaneously satisfy the buffering effect of the buffer insulation part 30 on the single cell 20 and the cooling effect of the coolant on the single cell 20.

[0066] 3. Multiple flow channels are provided on the same side of each buffer and heat insulation part 30, which can improve the uniformity of cooling of the individual battery 20 and the uniformity of buffering of the individual battery.

[0067] 4. The reasonable layout of the two battery modules within the housing 10 can reduce the space occupied inside the housing 10 and improve the space utilization of the battery pack.

[0068] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0069] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as exemplary only and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0070] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" 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 utility model and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0071] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0072] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this utility model.

[0073] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An immersion battery pack, characterized by, The submersible battery pack includes: The housing (10) has a coolant flow chamber (101), and the housing (10) also has an inlet (102) and an outlet (103) respectively communicating with the coolant flow chamber (101), and the coolant flow chamber (101) is used for coolant flow; Multiple single-cell batteries (20) are provided, and the multiple single-cell batteries (20) are arranged side by side in the coolant flow chamber (101) along the extension direction of the housing (10); A buffer heat insulation part (30) is arranged between two adjacent single batteries (20), a flow-through groove (301) is formed on the side of the buffer heat insulation part (30) facing the single battery (20), the buffer heat insulation part (30) is in abutting fit with the single battery (20) to form a flow-through channel for the flow of cooling liquid at the flow-through groove (301), the total area of the flow-through channel along the direction parallel to the buffer heat insulation part (30) is S1, and the area of the profile of the side of the buffer heat insulation part (30) facing the single battery (20) is S2, 2. The immersion battery pack according to claim 1, characterized in that, Multiple flow channels (301) are provided on the same side of the buffer insulation part (30).

3. The immersion battery pack according to claim 2, characterized in that, The buffer insulation part (30) includes: The heat insulation plate (31) is arranged parallel to the single battery cell (20); A plurality of buffer sheets (32) are provided, and the plurality of buffer sheets (32) are spaced apart on the surface of the heat insulation plate (31) facing the single cell (20). A flow groove (301) is formed between two adjacent buffer sheets (32), and the side of the buffer sheet (32) away from the heat insulation plate (31) abuts against the corresponding single cell (20).

4. The immersion battery pack according to claim 3, characterized in that, Both the heat insulation plate (31) and the buffer sheet (32) are immiscible with the coolant.

5. The immersion battery pack according to claim 4, characterized in that, The insulation panel (31) is made of nano-insulation material; and / or, The buffer sheet (32) is made of nitrile rubber.

6. The immersion battery pack according to claim 4, characterized in that, The expansion coefficient of the buffer sheet (32) in the coolant is a, where a ≤ 5%.

7. The immersion battery pack according to claim 3, characterized in that, The thickness of the heat insulation plate (31) is d1, 1mm ≤ d1≤2mm; The thickness of the buffer sheet (32) is d2, 1mm≤d2≤3mm.

8. The immersion battery pack according to claim 2, characterized in that, The plurality of said flow channels (301) are parallel to each other; and / or, The multiple flow channels (301) all extend in a straight line.

9. The immersion battery pack according to claim 1, characterized in that, A plurality of individual batteries (20) arranged side by side along the extension direction of the housing (10) form a battery module, and both ends of the flow channel are open structures along the extension direction; Two battery modules are provided, and the two battery modules are distributed at intervals along the width direction of the housing (10). Along the extension direction of the housing (10), a first flow channel (104) is formed between the side wall of the housing (10) and the corresponding battery module, and a second flow channel (105) is formed between two adjacent battery modules. One end of the flow channel is connected to the second flow channel (105), and the other end is connected to the corresponding first flow channel (104).

10. The immersion battery pack according to claim 9, characterized in that, The liquid inlet (102) and the liquid outlet (103) are located at opposite ends of the extending direction of the housing (10). The liquid inlet (102) is connected to the second flow channel (105). A drain channel (106) is formed between the end of the battery module near the liquid outlet (103) and the housing (10). One end of the drain channel (106) is connected to the first flow channel (104), and the other end is connected to the liquid outlet (103).

11. The immersion battery pack according to claim 9, characterized in that, The submersible battery pack also includes: A guide pipe (40) is disposed at the top of the second flow channel (105). The extension direction of the guide pipe (40) is the same as the extension direction of the second flow channel (105). One end of the guide pipe (40) is connected to the liquid inlet (102). A plurality of flow equalization ports are provided at the bottom of the guide pipe (40). The plurality of flow equalization ports are distributed at intervals along the extension direction of the guide pipe (40). The plurality of flow equalization ports are all connected to the second flow channel (105).

12. The immersion battery pack according to claim 1, characterized in that, The orthographic projection of the single cell (20) onto the buffer heat insulation part (30) is located within the buffer heat insulation part (30).

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