Immersed battery box and battery system

Abstract

The present invention relates to an immersion battery box and a battery system, the structure of the immersion battery box includes a battery box body, an integrated cover, a first panel module, a second panel module and an immersion coolant, wherein the interior of the battery box body is provided with a first flow channel and a second flow channel arranged in parallel, both of which are used to install battery cells, and the first flow channel is used for the inlet of the immersion coolant, and the second flow channel is used for the outlet of the immersion coolant. After the battery cells are installed in the first flow channel and the second flow channel, there is a cavity between adjacent battery cells for the coolant to flow through; the two integrated cover plates respectively cover the two ends of the battery box body, can be electrically connected to the battery cells and perform data acquisition, the first cover plate is arranged at the front end of the battery box body, and is provided with a liquid inlet and a liquid outlet, the second cover plate is arranged at the rear end of the battery box body, and is provided with a flow channel groove on the second cover plate, after the immersion coolant passes through the first flow channel, it can pass through the flow channel groove and circulate in a U shape to the second flow channel, and finally flow out of the battery box. After the battery box and cells are assembled, multiple battery boxes can be stacked vertically and / or expanded horizontally in series or parallel to form a battery system. Specifically, when expanded horizontally, S-shaped flow channels are formed between the multiple battery boxes, ensuring that each cell has sufficient contact with the coolant. The battery box and battery system provided by this invention utilize an immersion liquid cooling solution, resulting in minimal temperature differences, high thermal management efficiency, high battery integration, and support for scalable power generation.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and in particular to an immersion battery box and a battery system. Background Art

[0002] Whether it is an energy storage battery pack or a vehicle power battery pack, the temperature of the battery cell needs to be controlled by cooling or heating to keep it within a reasonable temperature range. At the same time, extremely high safety is required to ensure that heat diffusion does not occur when the battery cell thermal runaway occurs.

[0003] At present, most battery packs use heating film for heating, liquid cooling plate for cooling, and thermal insulation cotton for insulation. The following problems exist:

[0004] 1. Low heat conduction efficiency. The above measures are all indirect thermal management technologies. They can only manage the heat of the battery cell locally. The heat is then transferred to the entire battery box through the internal heat diffusion of the battery cell. The conduction efficiency is low and it is difficult to quickly achieve the thermal management effect.

[0005] 2. Poor insulation effect. Currently, most insulation measures are implemented by sticking insulation cotton on the box body, which mainly isolates the internal and external temperatures of the battery box, resulting in poor insulation effect.

[0006] 3. Large temperature differences and local thermal management strategies can easily cause large temperature differences in the battery cells, affecting battery performance.

[0007] Based on the above problems, there is an urgent need to design a method that can solve the problems of poor temperature uniformity, low heat dissipation efficiency, and inability to standardize the existing battery box. Summary of the Invention

[0008] The invention discloses an immersion type battery box and a battery system, aiming to solve the technical problems existing in the prior art.

[0009] The present invention adopts the following technical solutions:

[0010] In one aspect, an embodiment of the present invention provides an immersion battery box, comprising:

[0011] - A battery box body, used for arranging battery cells, the battery box body comprising a first end and a second end, an axially extending battery cell mounting slot being provided between the first end and the second end, a liquid flow baffle being provided in the middle of the battery cell mounting slot, the liquid flow baffle dividing the battery cell mounting slot into a first flow channel for liquid inlet and a second flow channel for liquid outlet, the first flow channel and the second flow channel both being axially extending and arranged in parallel, and the penetration direction of the first flow channel and the second flow channel being the same as the penetration direction of the battery cell mounting slot;

[0012] -Integrated cover plate, integrated panels are respectively arranged at the first end and the second end, capable of electrically connecting with the battery cell and collecting data;

[0013] - a first panel module, disposed at the first end, having a liquid inlet communicating with the first flow channel and a liquid outlet communicating with the second flow channel;

[0014] - a second panel module, disposed at the second end, and provided with a flow channel groove, the flow channel groove being used to guide the liquid flow from the first flow channel to the second flow channel;

[0015] -Immersion coolant, used to immerse the battery cells.

[0016] As a preferred technical solution, the inner surface of the battery cell installation groove is provided with a plurality of raised limiting parts for limiting and fixing the battery cell;

[0017] The length extension direction of the limiting portion is the same as the through direction of the battery cell installation groove. Several limiting portions are distributed between adjacent battery cells, so that cavities are formed between adjacent battery cells. The cavities are configured as sub-channels for the flow of immersion coolant.

[0018] As a preferred technical solution, both the upper inner surface and the lower inner surface of the battery cell installation groove are provided with limiting parts, and the positions of the limiting parts arranged on the upper inner surface and the lower inner surface correspond to each other.

[0019] As a preferred technical solution, the cross section of the limiting portion is semicircular, semi-elliptical or rectangular.

[0020] As a preferred technical solution, the battery box body is provided with a stacking mounting structure and / or a lateral expansion structure. The stacking mounting structure is used for vertical connection of multiple submerged battery boxes, and the lateral expansion structure is used for lateral connection of multiple submerged battery boxes.

[0021] As a preferred technical solution, the integrated cover is provided with a connecting busbar, an insulating cover, a voltage sampling harness and a temperature sampling harness.

[0022] As a preferred technical solution, the first panel module also includes a copper busbar output interface and a wiring harness interface.

[0023] As a preferred technical solution, both the first panel module and the second panel module include insulating materials.

[0024] As a preferred technical solution, the immersion cooling liquid is configured as a fluoride solution with high insulation properties.

[0025] On the other hand, an embodiment of the present invention further provides a battery system, which includes at least one submerged battery box as described in any one of the above items, and also includes battery cells, and the battery cells are arranged in the battery box body of the submerged battery box.

[0026] One embodiment of the above invention has the following advantages or beneficial effects:

[0027] The present invention mainly provides an immersion battery box and a battery system, the structure of which includes a battery box body, an integrated cover, a first panel module, a second panel module and an immersion coolant, wherein the interior of the battery box body is provided with a first flow channel and a second flow channel arranged in parallel, both of which are used to install battery cells, and the first flow channel is used for the inlet of the immersion coolant, and the second flow channel is used for the outlet of the immersion coolant. After the battery cells are installed in the first flow channel and the second flow channel, there is a cavity between adjacent battery cells for the coolant to flow through; the two integrated cover plates respectively cover the two ends of the battery box body, can be electrically connected to the battery cells and perform data acquisition, the first cover plate is arranged at the front end of the battery box body, and is provided with a liquid inlet and a liquid outlet, the second cover plate is arranged at the rear end of the battery box body, and is provided with a flow channel groove, after the immersion coolant passes through the first flow channel, it can pass through the flow channel groove and circulate in a U shape to the second flow channel, and finally flow out of the battery box.

[0028] After the battery box and battery cells are assembled, multiple battery boxes can be stacked vertically and / or expanded horizontally in series or parallel to form a battery system. In particular, when expanded horizontally, an S-shaped flow channel can be formed between the multiple battery boxes to ensure that each battery cell can fully contact with the coolant.

[0029] The battery box and battery system provided by the present invention adopt an immersion liquid cooling solution, which has small temperature difference, high thermal management efficiency, high battery integration and support for power expansion. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments, which constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0031] Figure 1 This is a structural exploded view of an immersion battery box provided in a preferred embodiment of Example 1 of the present invention;

[0032] Figure 2 This is a schematic structural diagram of an immersion battery box provided in a preferred embodiment of Example 1 of the present invention;

[0033] Figure 3 A top view of an immersion battery box provided in a preferred embodiment of Example 1 of the present invention;

[0034] Figure 4 for Figure 3 AA view;

[0035] Figure 5 This is a structural schematic diagram of a battery box body provided in a preferred embodiment of Example 1 of the present invention;

[0036] Figure 6 This is a front view of a battery box body provided in a preferred embodiment of Example 1 of the present invention;

[0037] Figure 7 for Figure 6 A partial enlarged view of point B in the middle;

[0038] Figure 8 This is a schematic structural diagram of a battery system provided in a preferred embodiment of Example 2 of the present invention;

[0039] Figure 9 This is a structural diagram of a battery system provided in a preferred implementation manner of Example 2 of the present invention.

[0040] Description of reference numerals:

[0041] Battery box body 1, first end 11, second end 12, liquid flow baffle 13, first flow channel 14, second flow channel 15, limit part 16; integrated cover 2; first panel module 3, liquid inlet 31, liquid outlet 32, second panel module 4, battery cell 5. DETAILED DESCRIPTION

[0042] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. In the description of the present invention, it should be noted that the term "or" is generally used in the sense of including "and / or" unless the content clearly indicates otherwise.

[0043] In the description of the present application, the terms "first", "second", etc. are only used to distinguish the descriptions and should not be understood as indicating or implying relative importance.

[0044] Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0045] Example 1

[0046] refer to Figure 1 — Figure 4 In one embodiment of the present invention, the structure of the immersion battery box includes at least a battery box body 1, an integrated cover 2, a first panel module 3, and a second panel module 4. The battery box body 1 is used to arrange battery cells 5 and inject immersion coolant. The immersion coolant can flow in a U-shape in the battery box body 1 to ensure that each battery cell 5 can fully contact the immersion coolant.

[0047] It should be noted that the submerged battery box in this embodiment does not include the battery cells 5 themselves, but for the sake of convenience, the submerged battery box will be described in conjunction with the relevant structures of the battery cells 5.

[0048] In this embodiment, the battery cell 5 used in the submerged battery box is preferably a blade battery in the shape of a long flat knife, such as Figure 4 or Figure 6 Each battery cell 5 is arranged vertically, and several battery cells 5 are arranged in parallel horizontally and arranged in the battery box body 1. Adjacent battery cells 5 are electrically connected in series or in parallel. Since the battery cells 5 of different manufacturers have different specifications, in order to ensure the universality of the immersion battery box in this embodiment, the specifications or the number of arrangements of the battery cells 5 are no longer specifically limited; furthermore, in this embodiment, the structure of the battery cell 5 itself is not changed, and the battery cell 5 can be directly purchased as a finished product, so the specific structure and working principle of the battery cell 5 are no longer described in detail in this embodiment.

[0049] Preferably, the immersion coolant in this embodiment is a fluoride solution with high insulation properties, more preferably perfluoroacetone, which has the characteristics of high insulation properties, high pressure resistance, good fluidity, high heat conduction efficiency and low expansion rate.

[0050] like Figure 1 In a preferred embodiment, the battery box body 1 is axially through-going, and its two ends are respectively a first end 11 and a second end 12. A cell mounting groove is provided between the first end 11 and the second end 12. A plurality of cell 5 are vertically arranged in the cell mounting groove. A liquid flow baffle 13 is provided in the middle of the cell mounting groove. The liquid flow baffle 13 divides the cell mounting groove into a first flow channel 14 and a second flow channel 15. Both are axially through-going and arranged in parallel. The through-going direction of the two is consistent with the through-going direction of the cell mounting groove. The first flow channel 14 is used for the inlet of the immersion coolant, and the second flow channel 15 is used for the outlet of the immersion coolant.

[0051] In a preferred embodiment, the battery box body 1 is made of aluminum or other corrosion-resistant materials.

[0052] like Figure 6 、 Figure 7In a preferred embodiment, the inner surface of the battery cell mounting groove of the battery box body 1 is provided with a plurality of raised limiting portions 16, which are used to limit and fix the battery cell 5; preferably, the length extension direction of the limiting portion 16 is the same as the through direction of the battery cell mounting groove, and the length of the limiting portion 16 is preferably consistent with the length of the battery cell mounting groove or slightly shorter than the battery cell mounting groove. Several limiting portions 16 are distributed between adjacent battery cells 5. On the one hand, they can provide guidance for the battery cell 5 during installation, so that the battery cell 5 can be directly inserted into the battery cell mounting groove along the limiting portion 16, and the battery cell 5 can be limited and fixed after insertion; on the other hand, several limiting portions 16 can form a cavity between adjacent battery cells 5, and the cavity is configured as a sub-flow channel of the immersion coolant. Since all the sub-flow channels are consistent with the overall direction of the immersion coolant, the flow of the immersion coolant can be consistent, turbulence can be avoided, and the temperature uniformity of cooling different battery cells 5 can be ensured, thereby improving the thermal management performance of the immersion battery box and extending the service life.

[0053] In a preferred embodiment, a plurality of limiting portions 16 are provided on the upper inner surface and the lower inner surface of the battery cell mounting groove. The number of the limiting portions 16 arranged on the upper side is the same as that arranged on the lower side, and the positions correspond one to one, so as to ensure the guiding effect on the battery cells 5 and ensure that there is a sub-flow channel between every two adjacent battery cells 5, so as to ensure that the immersion coolant can cool all battery cells 5.

[0054] like Figure 7 In a preferred embodiment, the cross-sectional shape of the limiting portion 16 is semicircular, semi-elliptical or rectangular. To facilitate its guiding function, it is preferably configured as a smooth semicircular or semi-elliptical shape.

[0055] In a preferred embodiment, the battery box body 1 is provided with a stacking mounting structure and / or a lateral expansion structure. The stacking mounting structure enables multiple submerged battery boxes to be connected vertically, and the lateral expansion structure enables multiple submerged battery boxes to be connected horizontally to assemble a larger amount of power.

[0056] In a preferred embodiment, the stacking installation structure can be configured as a modular splicing structure, and specifically, a plug-in connection can be achieved by designing a plug or socket structure; in another preferred embodiment, the stacking installation structure can be configured as a guide rail connection, and by designing a guide rail or groove on the battery box body 1, multiple immersion battery boxes can slide against each other and be stacked together.

[0057] In a preferred embodiment, the lateral expansion structure may be the same as the stacking installation structure, and bolts, nuts and other connectors may be used to achieve lateral connection between adjacent submerged battery boxes.

[0058] In a preferred embodiment, the integrated cover plate 2 is respectively provided at the first end 11 and the second end 12 of the battery box body 1 , and the integrated cover plate 2 can be electrically connected to the battery cell 5 and collect data.

[0059] In a preferred embodiment, the integrated cover 2 is provided with a connecting busbar, an insulating cover, a voltage sampling harness and a temperature sampling harness, wherein the connecting busbar is used to electrically connect several battery cells 5 in series and / or in parallel and output current; the insulating cover serves as the basic structure of the integrated cover 2 and is used to safely isolate the battery cells 5 from the external environment; the voltage sampling harness is used to monitor the voltage of the battery in real time to ensure that the battery management system can accurately obtain the voltage information of each battery cell 5 and perform voltage balancing control; the temperature sampling harness is used to monitor the temperature changes of the battery cells 5 and transmit the temperature information to the battery management system, which helps to prevent the battery cells 5 from overheating or overcooling, improve the safety and stability of the battery cells 5, and also helps to optimize the charging and discharging performance of the battery cells 5.

[0060] In a preferred embodiment, the first panel module 3 is sealed at the first end 11 , and the second panel module 4 is sealed at the second end 12 , and both are made of insulating material.

[0061] In a preferred embodiment, the first panel module 3 is provided with a liquid inlet 31 and a liquid outlet 32, wherein the liquid inlet 31 is communicated with the first flow channel 14, and the liquid outlet 32 ​​is communicated with the second flow channel 15; the second panel module 4 is provided with a flow channel groove ( Figure 1 The flow channel groove is used to guide the immersion cooling liquid from the first flow channel 14 to the second flow channel 15 in a U shape, as shown in FIG. Figure 5 Indicated by the arrow direction.

[0062] Preferably, when multiple submerged battery boxes are laterally expanded and connected, the liquid outlet 32 ​​of each submerged battery box is connected to the liquid inlet 31 of the adjacent submerged battery box, so that the immersion coolant can flow in an S shape between the multiple submerged battery boxes. At this time, the liquid inlet 31 and the liquid outlet 32 ​​are both located in the same plane, which reduces the volume of the entire battery system and improves the convenience during installation and maintenance.

[0063] Preferably, when multiple immersion battery boxes are stacked and connected longitudinally, the liquid outlet 32 ​​of each immersion battery box is connected to the liquid inlet 31 of the adjacent immersion battery box. Optionally, the configuration positions of the first flow channel 14 and the second flow channel 15 of two longitudinally adjacent immersion battery boxes can be interchanged left and right, or can be the same.

[0064] In a preferred embodiment, the first panel module 3 is also provided with a copper busbar output interface and a wiring harness interface, wherein the copper busbar output interface is used to provide power output for the battery system, and the wiring harness interface is used to connect wiring harnesses such as the voltage sampling harness and the temperature sampling harness with other parts of the battery system to realize data transmission and control signal transmission.

[0065] Example 2

[0066] refer to Figure 8-Figure 9 In one embodiment of the present invention, a battery system is provided. The battery system includes at least one submerged battery box as described in the above embodiment 1. Each submerged battery box is provided with a plurality of battery cells 5. The technical features already included in the above embodiment 1 are naturally inherited in this embodiment and will not be repeated.

[0067] like Figure 8 In a preferred embodiment, the battery system includes several longitudinally stacked submerged battery boxes, and adjacent submerged battery boxes are longitudinally connected by a superimposed mounting structure. In this embodiment, the number of axial stacking is no longer specifically limited, and those skilled in the art can make adaptive adjustments according to actual needs.

[0068] In a preferred embodiment, the liquid inlets 31 / liquid outlets 32 of multiple submerged battery boxes can be connected to the circulation pumps respectively, or the liquid outlet 32 ​​of the previous submerged battery box can be connected to the liquid inlet 31 of the next submerged battery box. In this case, it is only necessary to connect the liquid inlet 31 of the first submerged battery box and the liquid outlet 32 ​​of the last submerged battery box to the circulation system.

[0069] In a preferred embodiment, the liquid inlets 31 of multiple longitudinally connected immersion battery boxes can be coaxially arranged longitudinally, or the liquid inlets 31 and liquid outlets 32 of adjacent immersion battery boxes can be interchanged left and right. Regardless of whether they are interchanged or not, the liquid inlets 31 are internally connected to the first flow channel 14, and the liquid outlets 32 are internally connected to the second flow channel 15; when the liquid inlets 31 and liquid outlets 32 of the upper and lower adjacent immersion battery boxes are interchanged left and right, the liquid inlet 31 of the next immersion battery box is below the liquid outlet 32 ​​of the upper immersion battery box, and they are connected in sequence in this way.

[0070] like Figure 9 In a preferred embodiment, the battery system includes an immersion battery box with transverse expansion, and adjacent immersion battery boxes are connected transversely in a plane through a transverse expansion structure. In this embodiment, the number of transverse expansions is no longer specifically limited, and those skilled in the art can make adaptive adjustments according to actual needs.

[0071] When multiple submerged battery boxes are laterally extended and connected, the liquid outlet 32 ​​of each submerged battery box is connected to the liquid inlet 31 of the adjacent submerged battery box, so that the submerged cooling liquid can flow in an S shape between the multiple submerged battery boxes.

[0072] Preferably, the multiple submerged battery boxes in the battery system can be both axially stacked and laterally expanded.

[0073] In this embodiment, regardless of whether the multiple submerged battery boxes in the battery system are stacked vertically or expanded horizontally, the liquid inlets 31 and liquid outlets 32 of the adjacent multiple submerged battery boxes are located on the same plane, which reduces the volume of the entire battery system and improves the convenience during installation and maintenance.

[0074] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely illustrative and are not intended to limit the scope of the present application. Various changes and modifications may be made therein by those skilled in the art without departing from the scope and spirit of the present application. All such changes and modifications are intended to be included within the scope of the present application as required by the appended claims.

[0075] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0076] Similarly, it should be understood that in order to streamline the present application and aid in understanding one or more of the various inventive aspects, in the description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. However, this approach of the present application should not be interpreted as reflecting the intention that the application claimed for protection requires more features than those explicitly recited in each claim. More precisely, as reflected in the corresponding claims, the inventive point is that the corresponding technical problem can be solved with fewer features than all the features of a single disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into the detailed description, with each claim itself serving as a separate embodiment of the present application.

[0077] Those skilled in the art will understand that, except where mutually exclusive, all features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all processes or units of any method or apparatus disclosed herein may be combined in any combination. Unless expressly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature that provides the same, equivalent, or similar purpose.

Claims

1. An immersion battery box, characterized in that: include: - A battery box body, used for arranging battery cells, wherein the battery cells include blade batteries in the shape of long flat knives, and a plurality of the battery cells are vertically arranged and laterally arranged in parallel in the battery box body, wherein the battery box body includes a first end and a second end, and an axially through-going battery cell mounting groove is provided between the first end and the second end, and a liquid flow baffle is provided in the middle of the battery cell mounting groove, and the liquid flow baffle divides the battery cell mounting groove into a first flow channel for liquid inlet and a second flow channel for liquid outlet, wherein the first flow channel and the second flow channel are both axially through-going and arranged in parallel, and the through-going direction of the first flow channel and the second flow channel is the same as the through-going direction of the battery cell mounting groove; The inner surface of the battery cell installation groove is also provided with a plurality of raised limiting parts for limiting and fixing the battery cell; The length extension direction of the limiting portion is the same as the through direction of the battery cell installation groove. A plurality of the limiting portions are distributed between adjacent battery cells, so that a cavity is formed between adjacent battery cells. The cavity is configured as a sub-flow channel for the flow of immersion coolant. All sub-flow channels are consistent with the overall direction of the immersion coolant, so that the flow of the immersion coolant is consistent, turbulence is avoided, and uniform temperature cooling of different blade batteries is ensured. - an integrated cover plate, which is respectively arranged at the first end and the second end and can be electrically connected to the battery cell and used for data collection; - a first panel module, disposed at the first end, and having a liquid inlet communicating with the first flow channel and a liquid outlet communicating with the second flow channel; - a second panel module, disposed at the second end, and provided with a flow channel groove, wherein the flow channel groove is used to guide the liquid flow from the first flow channel to the second flow channel in a U-shape; -The immersion coolant is used to immerse the battery cells.

2. The submerged battery box according to claim 1, characterized in that: The upper inner surface and the lower inner surface of the battery cell installation groove are both provided with the limiting parts, and the positions of the limiting parts arranged on the upper inner surface and the lower inner surface correspond to each other.

3. The submerged battery box according to claim 2, characterized in that: The cross section of the limiting portion is semicircular, semi-elliptical or rectangular.

4. The submerged battery box according to claim 1, characterized in that: The battery box body is provided with a stacking installation structure and / or a lateral expansion structure. The stacking installation structure is used for vertical connection of a plurality of the submerged battery boxes, and the lateral expansion structure is used for lateral connection of a plurality of the submerged battery boxes.

5. The submerged battery box according to claim 1, characterized in that: The integrated cover is provided with a connecting busbar, an insulating cover, a voltage sampling harness and a temperature sampling harness.

6. The submerged battery box according to claim 1, characterized in that: The first panel module also includes a copper bus output interface and a wiring harness interface.

7. The submerged battery box according to claim 1, characterized in that: The first panel module and the second panel module both include insulating materials.

8. The submerged battery box according to claim 1, characterized in that: The immersion cooling liquid is configured as a fluoride solution having high insulating properties.

9. A battery system, characterized in that: The battery system includes at least one submerged battery box according to any one of claims 1 to 8, and further includes a battery cell, wherein the battery cell is arranged in a battery box body of the submerged battery box.

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