Battery box body

Abstract

The utility model discloses a battery box body, which comprises a box body, a battery box body and a battery box cover, a groove is arranged on the inner bottom wall of the box body, and the box body is made of aluminum; the heating integrated body is arranged in the groove in an embedded manner, and the heating integrated body is used for heating a plurality of groups of battery modules placed above the heating integrated body at the same time; and the structural adhesive is smeared between the heating integrated body and the battery module. Therefore, the heating integrated body is pre-embedded into the groove of the box body in an integrated embedding manner, so that the potential safety hazard caused by falling or poor attachment of the heating integrated body is fundamentally avoided, and the safety of the battery system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery box body. Background Art

[0002] In the current battery design field, the integration of cells into the box body generally adopts the CTP (Cell to PACK) technology. This technology connects the cells to the bottom of the box body through structural adhesive, and the arrangement of electric heating can only be limited to the way of attaching heating sheets to the side of the cells or the cell tabs.

[0003] However, this arrangement exposes some problems under long-term use and temperature changes. As the usage time of the battery module increases and the temperature constantly changes, the adhesive used to fix the heating sheet is prone to aging and gradually loses its original adhesion ability, which may cause the heating sheet to fall off, forming a "dry burning" phenomenon, and may further trigger battery thermal runaway, posing a serious threat to the safety of the battery system.

[0004] In addition, if there is a situation of poor local adhesion during the pasting process of the heating sheet, it will lead to uneven temperature distribution during the heating process of the battery, and the temperature of local batteries will rise abnormally. This not only may affect the performance and life of the battery, but also may accelerate the aging of the adhesive due to local overheating, further increasing the risk of the heating sheet falling off. At the same time, there is also the problem of low heating efficiency caused by the limited power of the heating sheet. Summary of the Utility Model

[0005] In order to solve the above technical problems, the utility model provides a battery box body.

[0006] In a first aspect, the utility model provides a battery box body, including: a box body, a groove is formed on the inner bottom wall of the box body, and the material of the box body is aluminum; a heating integration body, the heating integration body is embedded in the groove, and the heating integration body is used to heat multiple groups of battery modules placed above at the same time; a structural adhesive, the structural adhesive is applied between the heating integration body and the battery module.

[0007] The technical solution provided by the embodiment of the present utility model has the following advantages compared with the prior art: By embedding the heating assembly in an integrated manner into the groove of the box body, the potential safety hazards caused by the detachment or poor adhesion of the heating assembly are fundamentally eliminated, improving the safety of the battery system. At the same time, the battery module is heated by the heating assembly. The aluminum material has good temperature equalization performance, making the inner bottom wall of the box body transform into an efficient overall heat conduction surface. The heat transfer path of the heating assembly passes through the aluminum heat conduction surface, structural adhesive, and then to the battery module, greatly improving the heat conduction efficiency and temperature equalization effect. In addition, the existence of the groove not only optimizes the internal structure of the box body but also further enhances the structural strength of the box body, ensuring the stability and reliability of the battery system.

[0008] In addition, the battery box body proposed according to the above application may also have the following additional technical features:

[0009] Specifically, the groove is in a circuitous snake shape, and the outer shape of the heating assembly matches the groove.

[0010] Specifically, the heating assembly includes a first PI (Polyimide Film) film, a copper layer, a graphene layer, and a second PI film. Among them, the first PI film is arranged in the groove, the copper layer is covered on the first PI film, the graphene layer is coated on the copper layer, and the second PI film is arranged on the graphene layer.

[0011] Specifically, the thickness of the copper layer is 0.1 - 0.2 MM.

[0012] Specifically, the structural adhesive is a heat-conducting structural adhesive.

[0013] Specifically, an insulating layer is also sprayed between the heating assembly and the bottom of the groove.

[0014] Specifically, a liquid flow channel is arranged inside the box body, and the liquid flow channel is arranged below the heating assembly; an inlet and an outlet are arranged on the box body, and the inlet is communicated with one end of the liquid flow channel, and the outlet is communicated with the other end of the liquid flow channel.

[0015] Specifically, the liquid flow channel is in a U shape or a snake shape.

[0016] Specifically, a heat insulation layer is also arranged at the bottom of the box body.

[0017] Specifically, the box body is formed by assembling and welding stretched aluminum profiles. Description of the Drawings

[0018] The accompanying drawings here are incorporated into the description and form a part of this description, showing embodiments in line with this utility model, and are used together with the description to explain the principles of this utility model.

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or in the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic structural diagram of a battery box according to an embodiment of this utility model;

[0021] Figure 2 It is a schematic structural diagram of a groove according to an embodiment of this utility model;

[0022] Figure 3 It is a schematic cross-sectional structural diagram of a battery box according to an embodiment of this utility model;

[0023] Figure 4 For an embodiment of this utility model Figure 3 The enlarged structural diagram of area A in;

[0024] Figure 5 It is a schematic structural diagram of a heating assembly according to an embodiment of this utility model.

[0025] As shown in the figure: 1. Box body; 2. Heating assembly; 3. Water inlet; 4. Water outlet; 5. Structural adhesive; 6. Insulation layer; 7. Thermal insulation layer; 10. Groove; 11. Liquid flow channel; 20. First PI film; 21. Copper layer; 22. Graphene layer; 23. Second PI film. Detailed implementation manners

[0026] In order to be able to more clearly understand the above-mentioned objects, features, and advantages of this utility model, the following will further describe the solutions of this utility model. It should be noted that, without conflict, the embodiments of this utility model and the features in the embodiments can be combined with each other.

[0027] Many specific details are set forth in the following description in order to fully understand this utility model, but this utility model can also be implemented in other ways different from those described herein; obviously, the embodiments in the description are only a part of the embodiments of this utility model, rather than all of the embodiments.

[0028] The following will describe the battery box of the embodiment of this utility model with reference to the accompanying drawings.

[0029] Such as Figure 1 、 Figure 2, Figure 3 and Figure 4 As shown in Figure 3 and Figure 4 , the battery box body of the embodiment of the present utility model may include a box body 1. A groove 10 is formed on the inner bottom wall of the box body 1, and the box body 1 is made of aluminum.

[0030] It can be understood that the box body 1 is made of aluminum. The advantages of using aluminum material are mainly reflected in light weight, high strength and toughness, good heat conduction performance and heat dissipation capacity, effectively ensuring heat transfer.

[0031] A heating assembly 2 is embedded in the groove 10. The heating assembly 2 is used to heat multiple groups of battery modules (not shown in the figure) placed above simultaneously.

[0032] It can be understood that by setting the groove 10, not only can the heating assembly 2 be limited, but also the groove 10 forms a structure similar to a skeleton (reinforcing rib) inside the box body 1, enabling the box body 1 to better resist deformation and damage when subjected to external forces. And through a reasonable layout of the groove 10, the stress concentration of the box body 1 when bearing external forces can be effectively dispersed and reduced, reducing deformation or damage caused by excessive stress, thereby improving the structural strength of the box body 1. There is also an important advantage that cannot be ignored in the design of the groove 10, that is, it can reduce the installation height of the battery module in the box body 1, saving valuable space for the box body 1. This design optimization not only improves the space utilization rate but also makes the layout of the entire battery system more compact and efficient.

[0033] A structural adhesive 5 is applied between the heating assembly 2 and the battery module.

[0034] It can be understood that through the structural adhesive 5, not only can the gap between the heating assembly 2 and the battery module be filled to ensure full contact between them, thereby increasing the contact area and improving the heating rate. At the same time, the structural adhesive 5 also has excellent fixing and pasting performance, making the combination between the heating assembly 2 and the battery module more firm and reliable, further enhancing the structural strength of the entire battery system.

[0035] Specifically, the heating assembly 2 is embedded in the groove 10 of the box body 1 by embedding, and the battery module presses on the structural adhesive 5, which can further limit the heating assembly 2, fundamentally eliminating the safety hazard caused by the detachment of the heating assembly 2, improving the safety of the battery system. At the same time, the battery module is heated by the heating assembly 2. The aluminum material has good temperature uniformity performance, making the inner bottom wall of the box body 1 transform into an efficient overall heat conduction surface. The heat transfer path of the heating assembly 2 passes through the aluminum heat conduction surface, the structural adhesive 5 and then to the battery module, greatly improving the heat conduction efficiency and temperature uniformity effect. In addition, the existence of the groove 10 not only optimizes the internal structure of the box body 1, but also further enhances the structural strength of the box body 1, ensuring the stability and reliability of the battery system.

[0036] In an embodiment of the present invention, as Figure 1 and Figure 2 shown, the groove 10 is in a tortuous snake shape, and the outer shape of the heating assembly 2 matches the groove 10.

[0037] It can be understood that through the above settings, the contact area between the heating assembly 2 and the battery module can be increased, thereby improving the heating efficiency and heating effect of the heating assembly 2.

[0038] In an embodiment of the present invention, as Figure 5 shown, the heating assembly 2 includes a first PI film 20, a copper layer 21, a graphene layer 22 and a second PI film 23.

[0039] Among them, the first PI film 20 is arranged in the groove 10, the copper layer 21 is covered on the first PI film 20, the graphene layer 22 is coated on the copper layer 21, and the second PI film 23 is arranged on the graphene layer 22.

[0040] Specifically, the laminated structure of the first PI film 20, the copper layer 21, the graphene layer 22 and the second PI film 23 is adopted, so that the layers are closely combined and not easy to peel or fall off, thus ensuring the structural stability of the entire heating assembly 2. And the thickness of the heating assembly 2 does not exceed 1 mm, which can effectively reduce the complexity of the heating film assembly process and reduce the production cost.

[0041] In order to further clearly illustrate the previous embodiment, in an embodiment of the present application, the thickness of the copper layer 21 is 0.1 - 0.2 MM.

[0042] It can be understood that through the copper layer 21 with a thickness of 0.1 - 0.2 MM, sufficient heating power is ensured, so that heat can be quickly transferred from the heating source to the upper heating object, improving the heating efficiency. It not only meets the performance requirements but also controls the cost, making the entire heating assembly 2 have a high cost performance.

[0043] In an embodiment of the present utility model, the structural adhesive 5 is a heat-conducting structural adhesive.

[0044] Among them, it can be understood that the heat-conducting structural adhesive has excellent heat-conducting performance, can quickly transfer heat from the heating assembly 2 to the battery module, reduce the loss of heat during the transfer process, and improve the overall heat-conducting efficiency. Moreover, the heat-conducting structural adhesive can also improve the uniformity of heat propagation, ensure uniform heat transfer between the heating assembly 2 and the battery module, and avoid performance degradation or damage caused by excessive local heat.

[0045] In an embodiment of the present utility model, as Figure 4 shown, an insulating layer 6 is also sprayed between the heating assembly 2 and the bottom of the groove 10.

[0046] It should be noted that the insulating layer 6 described in this embodiment can be insulating paint to ensure that the insulation withstanding voltage of the box body 1 and the battery system meets the national standard requirements, and the excellent insulation performance and high-temperature resistance can reduce the loss of electric energy and the dissipation of heat, thereby improving the charge and discharge efficiency of the battery module.

[0047] In an embodiment of the present utility model, as Figure 3 and Figure 4 shown, a liquid flow channel 11 is arranged inside the box body 1, and the liquid flow channel 11 is arranged below the heating assembly 2. An inlet 3 and an outlet 4 are arranged on the box body 1, and the inlet 3 is communicated with one end of the liquid flow channel 11, and the outlet 4 is communicated with the other end of the liquid flow channel 11.

[0048] Specifically, when the temperature of the battery module is too high, the coolant can be supplied from the inlet 3 through the liquid flow channel 11 by using an external liquid supply system, and then flows out from the outlet 4 to take away the heat generated by the battery module, thereby controlling the temperature of the battery module and preventing overheating to ensure the service life and stable operation of the battery module. Among them, the external liquid supply system is a prior art and will not be elaborated here.

[0049] To further clearly illustrate the previous embodiment, in an embodiment of the present application, the liquid flow channel 11 is in a U shape or a serpentine shape. Among them, it can be understood that through the above settings, the heat exchange area with the box body 1 can be increased, thereby improving the heat dissipation efficiency of the battery module.

[0050] In an embodiment of the present utility model, as Figure 4 shown, a heat-insulating layer 7 is also arranged at the bottom of the box body 1.

[0051] It should be noted that the thermal insulation layer 7 described in this embodiment can be polystyrene foam or extruded polystyrene foam. The performance of the battery will be affected in a low-temperature environment. For example, the charging speed and discharge capacity will decrease. The setting of the thermal insulation layer 7 can not only reduce the influence of the external environment on the battery, but also reduce the loss of internal heat, thereby improving the performance of the battery.

[0052] In an embodiment of the present utility model, the box body 1 is formed by assembling and welding extruded aluminum profiles.

[0053] Among them, it can be understood that through the above settings, it has the advantages of light weight and high strength, is suitable as the material of the box body 1, helps to reduce the overall weight, and the welding performance of aluminum is excellent, making it easy to carry out welding processing to ensure the stability and sealing of the structure of the box body 1. The splicing design of the extruded aluminum profiles allows the box body 1 to be flexibly adjusted in length, height or width according to needs to meet the requirements of different application scenarios, thereby improving the applicable range of this battery box body.

[0054] In summary, for the battery box body of the embodiment of the present utility model, by embedding the heating assembly in the groove of the box body in an integrated manner, the potential safety hazards caused by the detachment or poor adhesion of the heating assembly are fundamentally eliminated, and the safety of the battery system is improved.

[0055] It should be noted that in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0056] The above are only the specific embodiments of the present utility model, enabling those skilled in the art to understand or implement the present utility model. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to the embodiments described herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery box, characterized in that: include: A box body, wherein a groove is formed on the inner bottom wall of the box body, and the material of the box body is aluminum; A heating integrated body, the heating integrated body is embedded in the groove, and the heating integrated body is used to heat multiple battery modules placed above at the same time; Structural adhesive, the structural adhesive is applied between the heating assembly and the battery module.

2. The battery box according to claim 1, characterized in that: The groove is in a tortuous snake shape, and the shape of the heating integrated body matches the groove.

3. The battery box according to claim 1, characterized in that: The heating integrated body comprises a first PI film, a copper layer, a graphene layer and a second PI film, wherein: The first PI film is arranged in the groove, a copper layer is covered on the first PI film, the copper layer is coated with a graphene layer, and a second PI film is arranged on the graphene layer.

4. The battery box according to claim 3, characterized in that: The thickness of the copper layer is 0.1-0.2MM.

5. The battery box according to claim 1, characterized in that: The structural adhesive is a thermally conductive structural adhesive.

6. The battery box according to claim 1, characterized in that: An insulating layer is sprayed between the heating integrated body and the bottom of the groove.

7. The battery box according to claim 1, characterized in that: A liquid flow channel is provided inside the box body, and the liquid flow channel is arranged below the heating integrated body; The box body is provided with a water inlet and a water outlet, wherein the water inlet is communicated with one end of the liquid flow channel, and the water outlet is communicated with the other end of the liquid flow channel.

8. The battery case according to claim 7, characterized in that: The liquid flow channel is U-shaped or serpentine-shaped.

9. The battery box according to claim 1, characterized in that: The bottom of the box is also provided with a heat-insulating layer.

10. The battery box according to claim 1, characterized in that: The box body is formed by assembling and welding stretched aluminum profiles.

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