Immersed battery box and battery system

Abstract

The utility model discloses an immersed battery box and a battery system. The immersed battery box comprises a battery box main body, an integrated cover plate, a first panel module and a second panel module, the battery box main body is used for arranging a battery cell and comprises a first end and a second end, an axially through battery cell mounting groove is formed between the first end and the second end, a liquid flow baffle is arranged 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; the first flow channel and the second flow channel are axially through and are arranged in parallel; the integrated cover plates are respectively arranged at the first end and the second end, and can be electrically connected with the battery cell for data acquisition; the first panel module is arranged at the first end and is provided with a liquid inlet communicated with the first flow channel and a liquid outlet communicated with the second flow channel; the second panel module is arranged at the second end and provided with a flow channel groove, and the flow channel groove is used for guiding the liquid flow from the first flow channel to the second flow channel.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy vehicles, and in particular to an immersion type 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 thermally runs away.

[0003] At present, most battery packs are heated by heating film, cooled by liquid cooling plate, and insulated by thermal insulation cotton. The problems are as follows:

[0004] 1. Low heat conduction efficiency. The above measures are all indirect heat management technologies, which can only manage the heat of the battery cell locally and then conduct it to the entire battery box through the heat spread inside the battery cell. The conduction efficiency is low and it is difficult to quickly achieve the heat management effect.

[0005] 2. Poor insulation effect. At present, most insulation measures are carried out by sticking insulation cotton on the box body, which is mainly to isolate the temperature inside and outside the battery box, and the insulation effect is poor;

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

[0007] Based on the above problems, there is an urgent need to design a battery box that can solve the problems of poor temperature uniformity, low heat dissipation efficiency, and non-standard configuration of existing battery boxes. Utility Model Content

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

[0009] The utility model adopts the following technical solutions:

[0010] On the one hand, an embodiment of the utility model 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 through battery cell installation groove is provided between the first end and the second end, a liquid flow baffle is provided in the middle of the battery cell installation groove, the liquid flow baffle divides the battery cell installation groove 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 are both axially through and arranged in parallel;

[0012] -Integrated cover plates, which are respectively arranged at the first end and the second end and can be electrically connected to the battery cell and collect 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, arranged at the second end, is provided with a flow channel groove, and the flow channel groove is used to guide the liquid flow from the first flow channel to the second flow channel.

[0015] 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;

[0016] 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.

[0017] 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.

[0018] As a preferred technical solution, the cross-section of the limiting portion is semicircular, semi-elliptical or rectangular.

[0019] As a preferred technical solution, 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 multiple immersion battery boxes, and the lateral expansion structure is used for lateral connection of multiple immersion battery boxes.

[0020] 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.

[0021] As a preferred technical solution, the first panel module also includes a copper bus output interface and a wiring harness interface.

[0022] As a preferred technical solution, both the first panel module and the second panel module include insulating materials.

[0023] As a preferred technical solution, an immersion coolant is provided in the battery box body, and the immersion coolant is configured as a fluoride solution with high insulation properties.

[0024] On the other hand, an embodiment of the utility model further provides a battery system, which includes at least one immersion battery box as described in any one of the above items, and also includes a battery cell, and the battery cell is arranged in a battery box body of the immersion battery box.

[0025] One embodiment of the above utility model has the following advantages or beneficial effects:

[0026] The utility model mainly provides an immersion type battery box and a battery system, the structure of which includes a battery box body, an integrated cover plate, a first panel module, a second panel module and an immersion type 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 type coolant, and the second flow channel is used for the outlet of the immersion type 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 a flow channel groove is provided on the second cover plate, after the immersion type 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.

[0027] 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. Especially 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.

[0028] The battery box and battery system provided by the utility model adopt an immersion liquid cooling solution, which has small temperature difference, high thermal management efficiency, high battery integration and supports power expansion. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solution of the embodiment of the utility model, the following is a brief introduction to the drawings required for the description of the embodiment, which constitute a part of the utility model. The schematic embodiment of the utility model and its description explain the utility model and do not constitute an improper limitation of the utility model. In the drawings:

[0030] Figure 1 This is a structural exploded view of an immersion battery box provided in a preferred implementation manner of Example 1 of the utility model;

[0031] Figure 2 This is a schematic structural diagram of an immersion battery box provided in a preferred implementation manner of Example 1 of the utility model;

[0032] Figure 3 A top view of an immersion battery box provided in a preferred embodiment of Example 1 of the utility model;

[0033] Figure 4 for Figure 3 AA view;

[0034] Figure 5This is a structural schematic diagram of a battery box body provided in a preferred implementation manner of Example 1 of the utility model;

[0035] Figure 6 A front view of a battery box body provided in a preferred implementation manner of Example 1 of the utility model;

[0036] Figure 7 for Figure 6 A partial enlarged view of point B in the middle;

[0037] Figure 8 A schematic diagram of the structure of a battery system provided in a preferred implementation manner of Example 2 of the utility model;

[0038] Fig. 9 This is a schematic diagram of the structure of a battery system provided in a preferred implementation manner of Example 2 of the utility model.

[0039] Description of reference numerals:

[0040] The battery box body 1, the first end 11, the second end 12, the liquid flow baffle 13, the first flow channel 14, the second flow channel 15, the limiter 16; the integrated cover plate 2; the first panel module 3, the liquid inlet 31, the liquid outlet 32, the second panel module 4, and the battery cell 5. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in combination with the specific embodiments of the utility model and the corresponding drawings. In the description of the utility model, it should be noted that the term "or" is usually used in the sense of including "and / or", unless the content clearly indicates otherwise.

[0042] 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.

[0043] Obviously, the described embodiments are only some embodiments of the utility model, not all 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.

[0044] Example 1

[0045] refer to Figure 1 — Figure 4In one embodiment of the utility model, the structure of the immersion battery box includes at least a battery box body 1, an integrated cover plate 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 with the immersion coolant.

[0046] It should be noted that the submerged battery box in this embodiment does not include the battery cell 5 itself, but for the sake of convenience of description, the submerged battery box will be described in conjunction with the relevant structure of the battery cell 5.

[0047] 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 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; further, 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.

[0048] Preferably, the immersion coolant in this embodiment is a fluoride solution with high insulation, more preferably perfluoroacetone, which has the characteristics of high insulation, high pressure resistance, good fluidity, high heat conduction efficiency and low expansion rate.

[0049] like Figure 1 In a preferred embodiment, the battery box body 1 is axially penetrated, and its two ends are respectively a first end 11 and a second end 12, and a battery cell mounting groove is provided between the first end 11 and the second end 12, and a plurality of battery cells 5 are vertically arranged in the battery cell mounting groove, and a liquid flow baffle 13 is provided in the middle of the battery cell mounting groove, and the liquid flow baffle 13 divides the battery cell mounting groove into a first flow channel 14 and a second flow channel 15, both of which are axially penetrated and arranged in parallel, and the penetration direction of the two is consistent with the penetration direction of the battery cell mounting groove, wherein 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.

[0050] In a preferred embodiment, the battery box body 1 is made of aluminum or other corrosion-resistant materials.

[0051] like Figure 6 , Figure 7In a preferred embodiment, a plurality of raised limiting portions 16 are provided on the inner surface of the cell mounting groove of the battery box body 1, and the limiting portions 16 are used to limit and fix the cell 5; preferably, the length extension direction of the limiting portion 16 is the same as the through direction of the cell mounting groove, and the length of the limiting portion 16 is preferably consistent with the length of the cell mounting groove or slightly shorter than the cell mounting groove, and a plurality of limiting portions 16 are distributed between adjacent cell 5, which can provide guidance for the cell 5 during installation, so that the cell 5 can be directly inserted into the cell mounting groove along the limiting portion 16, and the cell 5 can be limited and fixed after insertion; on the other hand, a plurality of limiting portions 16 can form a cavity between adjacent cell 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 made consistent, turbulence can be avoided, and the uniformity of cooling of different cells 5 can be ensured, thereby improving the thermal management performance of the immersion battery box and extending the service life.

[0052] 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, and the number of the limiting portions 16 arranged on the upper side and the lower side is the same, and the positions correspond one to one, so as to ensure the guiding effect on the battery cells 5, and to 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 down all the battery cells 5.

[0053] 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.

[0054] In a preferred embodiment, the battery box body 1 is provided with a stacking installation structure and / or a lateral expansion structure. The stacking installation structure enables multiple submerged battery boxes to be vertically connected, and the lateral expansion structure enables multiple submerged battery boxes to be horizontally connected to assemble a larger power capacity.

[0055] 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 a guide rail or groove is designed on the battery box body 1, so that multiple immersion battery boxes can slide on each other and be stacked together.

[0056] In a preferred embodiment, the lateral expansion structure may be the same structure as the stacking installation structure, or bolts, nuts and other connectors may be selected to achieve lateral connection between adjacent immersion battery boxes.

[0057] In a preferred embodiment, the integrated cover plate 2 is respectively disposed 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.

[0058] In a preferred embodiment, the integrated cover plate 2 is provided with a connecting busbar, an insulating cover plate, a voltage sampling harness and a temperature sampling harness, wherein the connecting busbar is used to electrically connect a plurality of battery cells 5 in series and / or in parallel and output current; the insulating cover plate serves as the basic structure of the integrated cover plate 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, improves the safety and stability of the battery cells 5, and also helps to optimize the charging and discharging performance of the battery cells 5.

[0059] 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.

[0060] 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, such as Figure 5 Indicated by the direction of the arrow.

[0061] 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 an 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.

[0062] 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.

[0063] 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 a voltage sampling harness and a temperature sampling harness to other parts of the battery system to realize data transmission and control signal transmission.

[0064] Example 2

[0065] refer to Figure 8-Figure 9 In one embodiment of the utility model, 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.

[0066] 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 stacking mounting structure. In this embodiment, the number of axial stacking is no longer specifically limited, and technical personnel in this field can make adaptive adjustments according to actual needs.

[0067] In a preferred embodiment, the liquid inlets 31 / liquid outlets 32 of multiple immersion battery boxes can be connected to the circulation pumps respectively, or the liquid outlet 32 ​​of the previous immersion battery box can be connected to the liquid inlet 31 of the next immersion battery box. In this case, it is only necessary to connect the liquid inlet 31 of the first immersion battery box and the liquid outlet 32 ​​of the last immersion battery box to the circulation system.

[0068] 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 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 previous immersion battery box, and they are connected in sequence in this way.

[0069] like Fig. 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 technical personnel in this field can make adaptive adjustments according to actual needs.

[0070] 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 an adjacent submerged battery box, so that the submerged cooling liquid can flow in an S shape between the multiple submerged battery boxes.

[0071] Preferably, the multiple submerged battery boxes in the battery system can be both axially stacked and laterally expanded.

[0072] 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 the liquid outlets 32 of the adjacent multiple submerged battery boxes are located in the same plane, which reduces the volume of the entire battery system and improves the convenience during installation and maintenance.

[0073] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely exemplary and are not intended to limit the scope of the present application to this. Those of ordinary skill in the art may make various changes and modifications therein without departing from the scope and spirit of the present application. All these changes and modifications are intended to be included within the scope of the present application as required by the appended claims.

[0074] 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.

[0075] Similarly, it should be understood that in order to streamline the present application and help understand one or more of the various utility model 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, the method of the present application should not be interpreted as reflecting the following intention: the claimed application requires more features than the features clearly stated in each claim. More specifically, as reflected in the corresponding claims, its utility model point is that the corresponding technical problem can be solved with less than all the features of a single disclosed embodiment. Therefore, the claims following the specific embodiment are hereby explicitly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the present application.

[0076] It will be understood by those skilled in the art that, except for mutually exclusive features, all features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this specification may be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts 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, the battery box body comprising a first end and a second end, an axially through battery cell installation groove is provided between the first end and the second end, a liquid flow baffle is provided in the middle of the battery cell installation groove, the liquid flow baffle divides the battery cell installation groove 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 are both axially through and arranged in parallel; - an integrated cover plate, which is disposed at the first end and the second end respectively and can be electrically connected to the battery cell and collect data; - 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; - A second panel module, arranged at the second end, 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.

2. The submerged battery box according to claim 1, characterized in that: 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; The length extension direction of the limiting portion is the same as the through direction of the battery cell installation groove, and a plurality of the limiting portions are distributed between adjacent battery cells, so that cavities are formed between adjacent battery cells, and the cavities are configured as sub-channels for the flow of immersion cooling liquid.

3. The submerged battery box according to claim 2, 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.

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

5. 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 immersion battery boxes, and the lateral expansion structure is used for lateral connection of a plurality of the immersion battery boxes.

6. 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.

7. 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.

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

9. The submerged battery box according to claim 1, characterized in that: An immersion coolant is also provided in the battery box body, and the immersion coolant is configured as a fluoride solution with high insulation.

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

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