Battery module mounting structure and battery pack

Abstract

The utility model provides a battery module mounting structure and a battery pack, the battery module mounting structure comprises a mounting base body, a battery module, a structural adhesive layer filled between the mounting base body and the battery module, and an expansion part arranged between the mounting base body and the battery module in a penetrating manner, and the expansion part can expand to peel off the battery module from the mounting base body. According to the battery module mounting structure disclosed by the utility model, the battery module is relatively convenient to disassemble; the structural strength of the bottom of the battery module is relatively high, and when the battery module is disassembled, a stress point is at the bottom, so that the battery module is not easy to deform due to stress; in addition, the expansion part can also play a role in limiting the distance between the battery module and the mounting base body, and when the structural adhesive is coated, the thickness of the structural adhesive layer can be ensured, so that the structural adhesive layer cannot be too thin to influence the self bonding performance.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and particularly relates to a battery module installation structure. The utility model also relates to a battery pack equipped with the above battery module installation structure. Background Art

[0002] A battery module, also known as a battery block, is a key component in a battery system. It is located in the battery pack and plays the role of assembling multiple battery cells into an independent unit. There are various ways to fix the battery module in the battery pack, and these methods are designed to ensure the stability and safety of the battery module in the battery pack.

[0003] Common battery module fixing methods include bolt connection, welding, and steel belts, etc. Bolt connection is one of the most common and traditional methods for fixing battery modules. The battery module is fixed to the box body or other supporting structures through multiple long bolts. This method has high connection strength and stability, and can ensure that the battery module is not easily loosened under external factors such as vibration and impact. Welding is another common fixing method, especially common in the connection of internal components of the battery pack. The welding connection has high strength and can effectively prevent the battery module from loosening. Steel belt fixing is a special fixing method. The battery module is tightly fixed in the battery pack through steel belts. Steel belt fixing has the advantages of stress dispersion and preventing module loosening, and can be flexibly arranged according to the size, shape, and stress conditions of the battery module. However, the above fixing methods all have the problem of cumbersome installation, and are formed by using the method of adhesively connecting the battery module to the battery pack housing.

[0004] Using the adhesive connection method, the battery module is usually adhered to the bottom plate or lower cold plate of the battery pack. When it is necessary to remove the battery module, the disassembly is relatively difficult. Summary of the Utility Model

[0005] In view of this, the utility model aims to propose a battery module installation structure to improve the disassembly convenience of the adhesively connected battery module.

[0006] To achieve the above object, the technical solution of the utility model is realized as follows:

[0007] A battery module installation structure includes an installation base body, a battery module, and a structural adhesive layer filled between the installation base body and the battery module. The installation structure further includes an expansion part penetrating between the installation base body and the battery module, and the expansion part can expand to form the peeling of the battery module from the installation base body.

[0008] Further, the expansion part is hollow and provided with a filling joint; the expansion part can expand due to the filling of a medium to form a thrust for the battery module to move away from the installation base body.

[0009] Further, the structural adhesive layer is filled on both sides of the expansion part.

[0010] Further, the expansion part is arranged in the middle of the bottom surface of the battery module.

[0011] Further, the expansion part includes an expansion tube and seals hermetically connected to both pipe orifices of the expansion tube.

[0012] Further, the expansion tube is made of rubber material or metal material.

[0013] Further, the two seals do not overlap with the battery module in the vertical direction.

[0014] Further, a protective film is attached to the expansion part, and the protective film constitutes insulation between the expansion part and the battery module.

[0015] Further, the thickness of the structural adhesive layer is the same as the height of the expansion part.

[0016] Compared with the prior art, the present utility model has the following advantages:

[0017] For the battery module mounting structure of the present utility model, after being bonded between the battery module and the mounting base through the structural adhesive layer, when it is necessary to remove the battery module from the mounting base, the expansion part is expanded between the battery module and the mounting base, and the expansion part can push against the battery module to peel it off from the mounting base, making the disassembly of the battery module relatively convenient; the bottom structure strength of the battery module is relatively large. When the battery module is disassembled, the stress point is at the bottom, which can make the battery module not easily deformed due to stress; the expansion part can also play a role in limiting the distance between the battery module and the mounting base. When applying the structural adhesive, it can ensure the thickness of the structural adhesive layer, so that the structural adhesive layer will not be too thin to affect its own bonding performance.

[0018] By injecting a medium into the expansion part through the filling joint, the outer wall of the expansion part will expand due to the extrusion of the medium, push against the battery module and the mounting base, and thus realize the detachment of the battery module from the mounting base, with convenient operation.

[0019] The structural adhesive layer bonds the battery module and the mounting base from both sides, having relatively good connection strength.

[0020] By arranging the expansion part in the middle of the bottom surface of the battery module, the battery module can be pushed better, improving the peeling effect of the expansion part.

[0021] An expansion tube and two seals are provided, which can enable the expansion part to form a closed cavity with a cavity inside. Then, by installing the filling joint on the expansion tube or the seal, after filling the medium into the expansion tube, the expansion part can expand to push against the battery module and the installation base.

[0022] Using rubber or metal materials can achieve the effect of the expansion tube expanding when the internal pressure increases.

[0023] The two seals do not overlap with the battery module in the vertical direction, enabling the expansion tube to penetrate the space between the battery module and the installation base. When the battery module is connected to the installation base, it will not cause extrusion to the connection between the seal and the expansion tube. The connection between the seal and the expansion tube is more firm and reliable, not easily damaged, and has a better sealing effect.

[0024] The protective film insulates between the battery module and the installation base at the expansion part, and the battery module will not discharge to the installation base through the expansion part, improving the safety performance of the use of the battery module installation structure.

[0025] The thickness of the structural adhesive layer is the same as the height of the expansion part and is flush with the contact surface of the battery module, which can enable the structural adhesive layer and the expansion part to jointly support the battery module and improve the connection stability of the battery module.

[0026] Another object of the present invention is to provide a battery pack, which is provided with the battery module installation structure as described above.

[0027] The battery pack described in the present invention has the same beneficial effects as the battery module installation structure described above compared to the prior art, and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0029] Figure 1 is the overall schematic diagram of the battery module installation structure according to Embodiment 1 of the present invention;

[0030] Figure 2 is the exploded schematic diagram of the battery module installation structure according to Embodiment 1 of the present invention;

[0031] Figure 3 is the top view of the battery module installation structure according to Embodiment 1 of the present invention;

[0032] Figure 4 is Figure 3 the cross-sectional view at A - A in

[0033] Figure 5 is Figure 4 a partial enlarged view of part B in

[0034] Figure 6 a schematic diagram of the overall structure of the expansion part described in the first embodiment of the present utility model.

[0035] Explanation of reference numerals:

[0036] 1. Installation base

[0037] 2. Battery module

[0038] 3. Structural adhesive layer

[0039] 4. Expansion part

[0040] 401. Expansion tube; 402. Seal

[0041] 5. Filling joint

[0042] 6. Protective film Detailed implementation manners

[0043] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments may be combined with each other.

[0044] In the description of the present utility model, it should be noted that if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, if terms such as "first", "second", etc. appear, they are also only for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0045] In addition, in the description of the present utility model, unless otherwise clearly defined, the terms "installation", "connection", "connection", "connector" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model may be understood in combination with specific situations.

[0046] The present utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0047] First embodiment

[0048] This embodiment relates to a battery module installation structure, which optimizes the bonding structure of the battery module in the battery pack to improve the disassembly convenience of the adhesively bonded battery module.

[0049] In terms of the overall structure, referring to Figure 1 and Figure 2 As shown, a battery module 2 installation structure in this embodiment includes an installation base 1, a battery module 2, and a structural adhesive layer 3 filled between the installation base 1 and the battery module 2. The installation structure further includes an expansion part 4 penetrating between the installation base 1 and the battery module 2. The expansion part 4 can expand to constitute the peeling of the battery module 2 from the installation base 1.

[0050] With the above settings, after the battery module 2 and the installation base 1 are bonded through the structural adhesive layer 3, when it is necessary to remove the battery module 2 from the installation base 1, the expansion part 4 is expanded between the battery module 2 and the installation base 1, and the expansion part 4 can push against the battery module 2 to peel it off from the installation base 1, making the disassembly of the battery module 2 relatively convenient. The bottom structure of the battery module 2 has greater strength. When the battery module 2 is disassembled, the force application point is at the bottom, which can prevent the battery module 2 from being deformed due to force. The expansion part 4 can also play a role in limiting the distance between the battery module 2 and the installation base 1. When applying the structural adhesive, it can ensure the thickness of the structural adhesive layer 3, so that the structural adhesive layer 3 will not be too thin to affect its own bonding performance.

[0051] Based on the above overall introduction, specifically, the installation base 1 is the housing at the bottom of the battery pack, which is used to support and connect the battery module 2. According to the different structures of the battery pack, the installation base 1 can also be a bottom guard plate or a lower cold plate. Secondly, in this embodiment, one expansion part 4 is provided corresponding to one battery module 2, which can peel the corresponding battery module 2 from the installation base 1. It should be noted that the setting form of the expansion part 4 can also be that one expansion part 4 is correspondingly arranged below multiple battery modules 2, and multiple battery modules 2 can be peeled off through the expansion of a single expansion part 4; or when a single battery module 2 is relatively large, multiple expansion parts 4 are arranged under one battery module 2, and the multiple expansion parts 4 can exert force at multiple points under the battery module 2, making it easier for the battery module 2 to be peeled off from the installation base 1.

[0052] Regarding the specific structural form of the expansion part 4, referring to Figures 2 to 5As shown, the expansion part 4 is hollow and provided with a filling joint 5. The expansion part 4 can expand due to the filling of the medium, so as to form a thrust on the battery module 2 away from the installation base 1. By injecting the medium into the expansion part 4 through the filling joint 5, the outer wall of the expansion part 4 will expand outward due to the extrusion of the medium, pushing against the battery module 2 and the installation base 1, and then realizing the detachment of the battery module 2 from the installation base 1. The filling joint 5 is hermetically connected to the installation part, and when injecting the medium into the expansion part 4 through the filling joint 5, the connection between the filling joint 5 and the expansion part 4 is reliable. The medium filled into the expansion part 4 can be gas or liquid, which does not affect the expansion use of the expansion part 4.

[0053] It should be noted that the expansion part 4 can also be set as a hollow sac-like structure, and an expander is filled inside. By activating the expander, the hollow sac-like structure expands, lifting the battery module 2 from the installation base 1 and realizing the peeling of the battery module 2.

[0054] In order to improve the connection strength of the battery module 2 on the installation base 1, the structural adhesive layer 3 is filled on both sides of the expansion part 4. Gluing and fixing the battery module 2 from both sides can make the installation of the battery module 2 more firm, and the influence of the vacancy of the structural adhesive layer 3 caused by the area where the expansion part 4 is located on the battery module 2 is relatively small. The structural adhesive layer 3 is formed by coating with an insulating structural adhesive, and the material can be selected from epoxy resin, polyurethane, acrylate, etc., which has high bonding strength and good insulation performance.

[0055] Based on the purpose of improving the pushing effect of the expansion part 4 on the battery module 2, referring to Figure 2 and Figure 4 As shown, the expansion part 4 is arranged in the middle of the bottom surface of the battery module 2. The expansion part 4 is arranged in the middle of the bottom surface of the battery module 2. When pushing the battery module 2 upward, it can make the structural adhesive layers 3 on both sides of the expansion part 4 receive more uniform force, and the effect of peeling the battery module 2 is better.

[0056] For the specific structure of the expansion part 4, referring to Figure 2 and Figure 6 As shown, the expansion part 4 includes an expansion tube 401 and seals 402 hermetically connected to both ends of the expansion tube 401. Setting the expansion tube 401 and the two seals 402 can make the expansion part 4 form a closed cavity with a cavity inside. Then, by installing the filling joint 5 on the expansion tube 401 or the seal 402, after injecting the medium into the expansion tube 401, the expansion part 4 can expand and push against the battery module 2 and the installation base 1. The expansion tube 401 is flat tubular and clamped between the installation base 1 and the battery module 2. After being filled with the medium, it can expand and gradually approach the shape of a circular tube, separating the battery module 2 and the installation base 1 during the deformation process.

[0057] Specifically, the expansion tube 401 is made of rubber or metal. When the expansion tube 401 is made of rubber, a high-pressure resistant rubber material is selected. The expansion tube 401 has elasticity and can also withstand a large medium pressure. After the battery module 2 is pushed and peeled off from the mounting base 1, the expansion tube 401 can be reused after discharging the internal medium. When the expansion tube 401 is made of metal, a flat thin aluminum tube or thin steel tube can be used, which can play a certain supporting role for the battery module 2. After the medium is filled into the metal expansion tube 401, plastic deformation will occur to separate the battery module 2 and the mounting base 1. If it is necessary to bond the battery module 2 to the mounting base 1 again, a new metal expansion tube 401 needs to be replaced, which is for one-time use. For the material of the seal 402, plastic or metal can be used. The seal 402 is fixedly connected to the pipe orifice of the expansion tube 401, and stable sealing can be achieved.

[0058] To better maintain the sealing effect between the expansion tube 401 and the seal 402, as shown in Figure 2 and Figure 3 The two seals 402 do not overlap with the battery module 2 in the vertical direction. The two seals 402 do not overlap with the battery module 2 in the vertical direction, which can enable the expansion tube 401 to penetrate the space between the battery module 2 and the mounting base 1. When the battery module 2 is connected to the mounting base 1, it will not cause extrusion to the connection between the seal 402 and the expansion tube 401, and the connection between the seal 402 and the expansion tube 401 is more firm and reliable, and is not easily damaged.

[0059] Based on the need to protect the battery module 2, a protective film 6 is attached to the expansion part 4. The protective film 6 constitutes insulation between the expansion part 4 and the battery module 2. The protective film 6 completely covers the corresponding part between the top of the expansion tube 401 and the battery module 2 and is bonded to the expansion tube 401, so that the battery module 2 and the mounting base 1 are insulated at the expansion part 4, and the battery module 2 will not discharge to the mounting base 1 through the expansion part 4, improving the use safety performance of the battery module 2 mounting structure in this embodiment.

[0060] For the specific material of the protective film 6, the protective film 6 in this embodiment is made of PET (Polyethyleneterephthalate). The PET protective film 6 has excellent impact strength, good folding resistance, high transparency, good gloss, and is not easily damaged when contacting the battery module 2. In addition, the PET protective film 6 also has excellent high and low temperature resistance, can be used for a long time within the temperature range of 120 °C, can withstand a high temperature of 150 °C for short-term use, and can maintain the stability of its mechanical properties in a high temperature environment. Of course, materials such as polyimide, polytetrafluoroethylene, and polyethylene can also be used.

[0061] To improve the connection firmness of the battery module 2 on the installation base 1, the thickness of the structural adhesive layer 3 is the same as the height of the expansion part 4. The expansion part 4 plays a role in supporting and limiting between the battery module 2 and the installation base 1, and can limit the minimum thickness of the structural adhesive layer 3, so that the thickness of the structural adhesive layer 3 is the same as the height of the expansion part 4. The obtained structural adhesive layer 3 is flush with the top surface of the expansion part 4, and together they form a relatively flat contact surface with the battery module 2, which can enable the structural adhesive layer 3 and the expansion part 4 to jointly support the battery module 2 and improve the connection stability of the battery module 2.

[0062] When disassembling the battery module 2 in this embodiment, only need to connect the inflation device or liquid filling device to the filling joint 5, and then inject gas or liquid into the expansion part 4 to make the expansion part 4 expand, then the battery module 2 can be peeled off from the installation base 1. The operation is simple and the use is convenient.

[0063] Embodiment 2

[0064] This embodiment relates to a battery pack, on which there is the battery module installation structure of Embodiment 1, and the battery module is fixed by means of adhesive bonding.

[0065] By adopting the battery module installation structure in Embodiment 1, when it is necessary to disassemble the battery module of the battery pack, only need to inflate or fill the expansion part through the filling joint, then the expansion part can be expanded, and the side wall of the expansion tube pushes against the battery module and the installation base, so that the battery module is peeled off from the installation base, which improves the convenience of disassembling the battery module of the battery pack, and further improves the convenience of overhauling the battery pack.

[0066] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery module mounting structure, comprising a mounting base, a battery module, and a structural adhesive layer filled between the mounting base and the battery module, characterized in that: The mounting structure further comprises an expansion portion penetrating between the mounting base and the battery module, wherein the expansion portion can expand to peel the battery module from the mounting base.

2. The battery module installation structure according to claim 1, characterized in that: The expansion portion is hollow and is provided with a filling joint; the expansion portion can expand due to the filling of a medium to form a thrust to push the battery module away from the mounting base.

3. The battery module installation structure according to claim 2, characterized in that: The structural adhesive layer is filled on both sides of the expansion portion.

4. The battery module installation structure according to claim 3, characterized in that: The expansion portion is disposed in the middle of the bottom surface of the battery module.

5. The battery module installation structure according to claim 2, characterized in that: The expansion part includes an expansion pipe and a sealing member sealingly connected to two pipe openings of the expansion pipe.

6. The battery module installation structure according to claim 5, characterized in that: The expansion tube is made of rubber or metal.

7. The battery module installation structure according to claim 6, characterized in that: The two sealing members do not overlap with the battery module in a vertical direction.

8. The battery module installation structure according to any one of claims 1 to 7, characterized in that: The expansion part is covered with a protective film, and the protective film serves as insulation between the expansion part and the battery module.

9. The battery module installation structure according to claim 3, characterized in that: The thickness of the structural adhesive layer is the same as the height of the expansion portion.

10. A battery pack, characterized in that: The battery pack is provided with a battery module mounting structure as claimed in any one of claims 1 to 9.

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