Battery pack and electric equipment

Abstract

The utility model relates to a battery pack and electric equipment, the battery pack comprises a shell, a battery cell module and a cover plate, the battery cell module is arranged in the shell, the cover plate is detachably arranged on a first surface of the shell, and a bonding layer is arranged between the battery cell module and the cover plate; the bonding layer is arranged on the cover plate and the battery cell module, magnetic substances are distributed in the bonding layer, and the cover plate and the battery cell module are detachably connected through the bonding layer. And a variable-frequency magnetic field is applied to the cover plate and the bonding layer through electromagnetic equipment, so that the temperature of the magnetic object and the bonding layer can be rapidly increased, the strength of the bonding layer is reduced, and disassembly is convenient. The disassembly efficiency of the battery pack can be improved, and disassembly, maintenance and echelon utilization are facilitated.

Description

Technical Field

[0001] The present application relates to the technical field of battery structure, and in particular to a battery pack and electrical equipment. Background Art

[0002] At present, with the development of new energy vehicles, the CTB structure (battery-body integration) is being vigorously developed as an important means to improve the energy density of the battery pack to solve the range anxiety of the whole vehicle. In order to improve the stability of the battery pack structure, high-bonding strength structural adhesives are often used for detachable assembly of the battery pack.

[0003] In the related art, the high-strength bonding structural adhesive makes the disassembly process of the battery pack more difficult, and it is not convenient to disassemble, repair and recycle the battery pack. Utility Model Content

[0004] The present application is proposed to solve the above-mentioned problems. According to one aspect of the present application, a battery pack is provided, including a shell, a battery cell module and a cover plate, wherein: the battery cell module is arranged inside the shell, the cover plate is detachably arranged on the first surface of the shell, and an adhesive layer is arranged between the battery cell module and the cover plate; the adhesive layer is arranged between the cover plate and the battery cell module, magnetic materials are distributed in the adhesive layer, and the cover plate and the battery cell module are detachably connected through the adhesive layer.

[0005] Exemplarily, the adhesive layer includes a first adhesive layer and a second adhesive layer, the first adhesive layer is arranged on the second surface of the cover plate, the second adhesive layer is arranged on the first surface of the battery cell module, and the first adhesive layer is bonded to the second adhesive layer.

[0006] Exemplarily, the first adhesive layer and the second adhesive layer are insulating resin layers.

[0007] Exemplarily, the first bonding layer includes a magnetically sensitive adhesive, and the magnetic material is magnetically sensitive powder distributed in the magnetically sensitive adhesive.

[0008] Exemplarily, the thickness of the first adhesive layer and / or the second adhesive layer is 200 μm to 2 mm.

[0009] Exemplarily, the area of ​​the connection surface between the adhesive layer and the cover plate is greater than 30% of the area of ​​the second surface of the cover plate.

[0010] Exemplarily, the particle size of the magnetically sensitive powder is 5 nm-100 μm.

[0011] Exemplarily, the battery cell module includes a plurality of stacked battery cells, and the battery cells are soft-pack batteries, cylindrical batteries or square batteries.

[0012] Exemplarily, a bottom plate is also included, the bottom plate includes a bottom guard plate and a liquid cooling plate, the bottom guard plate and the liquid cooling plate are arranged on the shell, and the liquid cooling plate is located between the shell and the bottom guard plate.

[0013] Exemplarily, a thermally conductive adhesive is provided on the battery cell module, the thermally conductive adhesive is located between the liquid cooling plate and the battery cell module, and the thermally conductive adhesive is bonded to the second surface of the battery cell module.

[0014] According to another aspect of the present application, an electric device is provided, wherein the electric device includes the above-mentioned battery pack.

[0015] The battery pack in the present application sets the battery cell inside the shell, and the cover of the battery pack is bonded to the battery cell module through an adhesive layer, and magnetic materials are distributed inside the adhesive layer. When disassembly is required, a variable frequency magnetic field can be applied to the cover and the adhesive layer through electromagnetic equipment, which can quickly heat up the magnetic material and the adhesive layer, thereby reducing the strength of the adhesive layer and facilitating disassembly. Compared with the violent disassembly in the related art, the battery pack of the present application can improve the disassembly efficiency and facilitate disassembly, maintenance and cascade utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] By describing the embodiments of the present application in more detail in conjunction with the accompanying drawings, the above and other purposes, features and advantages of the present application will become more apparent. The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0017] Figure 1 A schematic diagram of the structure of a battery pack in an embodiment of the present application is shown.

[0018] Attached figure price: 1. Cover plate; 11. First adhesive layer; 2. Shell; 3. Battery cell module; 31. Second adhesive layer; 4. Bottom plate. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present application more obvious, the example embodiments according to the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application, and it should be understood that the present application is not limited to the example embodiments described herein. Based on the embodiments of the present application described in the present application, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present application.

[0020] In the related art, structural adhesives and the like are used as adhesives to achieve detachable connections between battery cells and cover plates. Due to the high strength of the adhesive itself, when disassembling, violent disassembly or high-temperature heating to reduce the strength of the adhesive is generally used. Violent disassembly may damage the mechanical structure of the battery pack and is time-consuming and laborious. On the one hand, the conventional high-temperature heating method has a slow heat transfer process from the outside to the inside of the battery pack, which will take up more time. On the other hand, high-temperature heating may increase the temperature of the battery cell and cause damage to the battery cell or safety accidents. Therefore, the disassembly process of the battery pack is relatively inconvenient, and it is not convenient to disassemble, repair, and recycle for cascade utilization.

[0021] like Figure 1 As shown, an embodiment of the present application provides a battery pack, including a shell 2, a battery cell module 3 and a cover plate 1, wherein: the battery cell module 3 is arranged inside the shell 2, the cover plate 1 is detachably arranged on the first surface of the shell 2, and an adhesive layer is arranged between the battery cell module 3 and the cover plate 1.

[0022] The adhesive layer is provided between the cover plate 1 and the battery core module 3 , magnetic materials are distributed in the adhesive layer, and the cover plate 1 and the battery core module 3 are detachably connected via the adhesive layer.

[0023] The battery pack in the present application sets the battery cell inside the shell 2, and the cover plate 1 of the battery pack is bonded to the battery cell module 3 through an adhesive layer, and magnetic materials are distributed inside the adhesive layer. When disassembly is required, a variable frequency magnetic field can be applied to the cover plate 1 and the adhesive layer through electromagnetic equipment, which can quickly heat up the magnetic material and the adhesive layer, thereby reducing the strength of the adhesive layer and facilitating disassembly. Compared with the violent disassembly in the related art, the battery pack of the present application can improve the disassembly efficiency and facilitate disassembly, maintenance and cascade utilization.

[0024] Because magnetic materials are distributed in the adhesive layer of the present application, after the variable frequency magnetic field of alternating current is applied, the magnetically sensitive powder will heat up from the inside of the adhesive layer and transfer to the entire adhesive layer. The temperature of the adhesive layer rises rapidly, thereby reducing the bonding strength of the adhesive layer, so as to disassemble the cover plate 1 and the battery cell. Compared with directly using high-temperature heating or violent disassembly, it is more time-saving and labor-saving and has less safety hazards. Therefore, the disassembly efficiency is high and environmentally friendly.

[0025] like Figure 1 As shown, the first surface and the second surface in the embodiment of the present application are referenced to direction A and direction B, and both direction A and direction B are vertical directions. The battery pack in the figure is placed vertically, the first surface represents a side surface corresponding to direction A, and the second surface represents a side surface corresponding to direction B. The first surface of the shell 2 is located at the top of the shell 2, and the second surface of the shell 2 is located at the bottom of the shell.

[0026] Exemplarily, the adhesive layer includes a first adhesive layer 11 and a second adhesive layer 31 , the first adhesive layer 11 is disposed on the second surface of the cover plate 1 , the second adhesive layer 31 is disposed on the first surface of the battery module 3 , and the first adhesive layer 11 is bonded to the second adhesive layer 31 .

[0027] Among them, the first adhesive layer 11 and the second adhesive layer 31 are both insulating resin layers. The first adhesive layer 11 includes a magnetically sensitive adhesive, and the first adhesive layer 11 is formed after the magnetically sensitive adhesive is cured, and the second adhesive layer 31 is formed after the structural adhesive is cured. On the one hand, the first adhesive layer 11 and the second adhesive layer 31 are used to connect the cover plate 1 and the battery module 3, and on the other hand, they can also be used to insulate the battery core to avoid leakage. Magnetic substances are distributed in the above-mentioned magnetically sensitive adhesive. Among them, the magnetic substance is magnetically sensitive powder, that is, magnetic material powder.

[0028] Exemplarily, the resin layer used for the first adhesive layer 11 and the second adhesive layer 31 can be one of polyurethane, acrylate, epoxy, silane-modified polyether (MS glue), or a structural adhesive adhesive of the above materials modified and hybridized. Exemplarily, the bonding strength of the resin layer at room temperature is greater than or equal to 8MPa, and the bonding strength at 50°C is greater than or equal to 3MPa. Its bonding strength will gradually decrease with the increase of temperature. Exemplarily, the temperature of the first adhesive layer 11 in the present application will quickly reach 200 degrees Celsius after being heated by the variable frequency magnetic field, thereby greatly reducing the bonding strength and facilitating disassembly.

[0029] Exemplarily, the insulation withstand voltage value of the above-mentioned resin layer is 3000AC, that is, the insulation withstand voltage is not less than 3000V alternating current. The withstand voltage leakage current within 60s does not exceed 3mA. The resistivity per unit volume is ≥10^10Ω.cm. Therefore, the resin of the first adhesive layer 11 and the second adhesive layer 31 can meet the requirements of insulation withstand voltage, and can also be used for insulation of the battery cell to avoid leakage of the battery cell. For the first adhesive layer 11 and the second adhesive layer 31, the resin layer of the same body is used to ensure the bonding strength between the first adhesive layer 11 and the second adhesive layer 31.

[0030] The first adhesive layer 11 is bonded to the second surface of the cover plate 1 by coating, wherein the first surface of the cover plate 1 refers to Figure 1 The top of the middle cover plate 1, the second surface of the cover plate 1 refers to Figure 1The bottom of the middle cover plate 1. Similarly, the first surfaces of the battery cell module 3 and the shell 2 correspond to their respective tops, and the second surfaces correspond to their respective bottoms. The magnetically sensitive adhesive described above is applied to the bottom of the cover plate 1, and a first bonding layer 11 is formed after the magnetically sensitive adhesive is cured (it can be cured at room temperature). The second bonding layer 31 is formed by coating the first surface of the battery cell module 3 with structural adhesive and curing it. Among them, the coating thickness of the first bonding layer 11 and the second bonding layer 31 is 200μm~2mm, and preferably, the coating thickness can be 1mm.

[0031] In some embodiments, instead of using structural adhesive to coat the top of the battery cell module 3, the first adhesive layer 11 may be directly used to bond the cover plate 1 and the battery cell module 3. In this case, the first adhesive layer 11 will have a thicker coating thickness to meet the requirements of bonding strength and insulation.

[0032] Exemplarily, after the magnetically sensitive adhesive is coated on the bottom of the cover plate 1, the area of ​​the connecting surface between the first adhesive layer 11 formed by solidification and the cover plate 1 is greater than 30% of the area of ​​the second surface of the cover plate 1 (the bottom of the cover plate 1), that is, more than 30% of the bottom of the cover plate 1 is coated with the magnetically sensitive adhesive, thereby ensuring sufficient bonding strength between the cover plate 1 and the battery cell module 3 while controlling costs.

[0033] The magnetically sensitive powder in the first adhesive layer 11 is a powder of magnetic material. Specifically, the magnetically sensitive powder can be one or a combination of iron powder, iron oxide powder, strontium ferrite, chromium dioxide powder, cobalt-iron oxide powder, nickel powder, barium ferrite, manganese-zinc ferrite, nickel-zinc ferrite, and magnesium-zinc ferrite at a micron or nanometer particle size. The above-mentioned materials will generate heat due to electromagnetic induction after being applied with a variable frequency magnetic field, thereby causing the overall temperature of the first adhesive layer 11 to rise, and because the heat is generated from the inside to the outside, the overall temperature of the first adhesive layer 11 will rise faster and more evenly. Among them, the particle size of the magnetically sensitive powder is 5nm-100μm. When configuring the magnetically sensitive adhesive, the magnetically sensitive powder of the appropriate type and particle size can be selected according to the actual situation.

[0034] Exemplarily, the content of the magnetically sensitive powder distributed in the first adhesive layer 11 is 5-90%wt, that is, the mass proportion or volume proportion of the magnetically sensitive powder in the first adhesive layer 11 is 5%-90%. The higher the content of the magnetically sensitive powder, the faster the temperature of the first adhesive layer 11 rises when a variable frequency magnetic field is applied, and it is more convenient to disassemble. The lower the content of the magnetically sensitive powder, the higher the bonding strength of the first adhesive layer 11. When using, the appropriate proportion can be selected according to the actual situation to ensure a balance between bonding strength and removability.

[0035] Exemplarily, the housing 2 of the battery pack is a tray of the battery pack. The tray is used to accommodate the battery module in the battery pack. The battery module 3 includes a plurality of stacked battery cells, which are cylindrical batteries, soft-pack batteries or square batteries. A plurality of battery cells are stacked and connected in series (parallel) to form a battery module 3. The battery module 3 is placed in the housing 2 and is protected by the housing 2.

[0036] The second surface of the housing 2 (i.e., the bottom of the housing 2 in direction B in the figure) is provided with a bottom plate 4. The second surface of the battery module 3, i.e., the bottom of the battery module 3, is provided with a thermal conductive adhesive, which is located between the bottom plate 4 and the battery module 3.

[0037] Exemplarily, the bottom plate 4 includes a liquid cooling plate and a bottom guard plate, and the bottom guard plate and the liquid cooling plate are arranged at the bottom of the shell 2 (i.e., the tray), wherein the liquid cooling plate is located between the shell 2 and the bottom guard plate, the liquid cooling plate and the bottom of the shell 2 are integrally formed, and the bottom guard plate and the bottom of the shell 2 are fixedly connected or detachably connected. The bottom guard plate provides bottom protection for the battery module 3, and the thermal conductive adhesive is located between the liquid cooling plate and the battery module 3, and the thermal conductive adhesive can be used to dissipate heat from the battery module 3. When assembling the battery module 3, the thermal conductive adhesive is first coated on the surface, and then it is turned over and sent into the shell 2, and the structural adhesive is coated on the other surface as a second bonding layer 31. Finally, the cover plate 1 and the battery module 3 are bonded.

[0038] The process of disassembling and assembling the battery pack in the embodiment of the present application is as follows:

[0039] During assembly, multiple stacked battery cells are formed into a battery module 3, and thermal conductive glue is first applied to the surface of the battery module 3, and then the battery module 3 is turned over and placed in the shell 2. Structural glue is then applied to the upper surface of the battery module 3 to form a second bonding layer 31. A magnetically sensitive adhesive is applied to the cover plate 1 to form a first bonding layer 11, and the first bonding layer 11 and the second bonding layer 31 are bonded and sealed, and finally the cover plate 1 and the shell 2 are fixed by threaded connection and the like, thereby realizing the assembly of the battery pack. Alternatively, you can choose not to use the second bonding layer 31, and directly form the first bonding layer 11 on the cover plate 1, and then bond and seal it to the top surface of the battery module 3, and then fix the cover plate 1.

[0040] When disassembly is required, first remove the connectors (such as bolts, rivets, etc.) between the cover plate 1 and the housing 2, and then apply a variable frequency magnetic field to the cover plate 1 and the adhesive layer through an AC electromagnetic device, which can quickly heat up the magnetic powder and the first adhesive layer 11, thereby reducing the strength of the adhesive layer. The first adhesive layer 11 can be easily removed from the top of the battery module 3, thereby realizing the disassembly of the cover plate 1, and facilitating the maintenance or cascade utilization of the battery module 3. The operation is simple and fast, the cost is lower, and it is environmentally friendly.

[0041] The embodiment of the present application further provides an electric device, which includes the above-mentioned battery pack and is powered by the battery pack. The electric device may be an electric vehicle.

[0042] The electric equipment in the embodiment of the present application uses the above-mentioned battery pack. When it needs to be disassembled, a variable frequency magnetic field can be applied to the cover plate 1 and the adhesive layer through an electromagnetic device, which can quickly heat up the magnetic sensitive powder and the adhesive layer, thereby reducing the strength of the adhesive layer and facilitating disassembly. Compared with violent disassembly in related technologies, it can improve disassembly efficiency and facilitate disassembly maintenance and cascade utilization.

[0043] 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.

[0044] 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.

[0045] Similarly, it should be understood that in order to streamline the present application and help understand 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, 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, the inventive point is that the corresponding technical problem can be solved with features 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.

[0046] 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.

[0047] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0048] It should be noted that the above embodiments illustrate the present application rather than limit the present application, and that those skilled in the art may design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets should not be constructed as a limitation on the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "one" or "an" preceding an element does not exclude the presence of multiple such elements. The present application may be implemented with the aid of hardware including several different elements and with the aid of appropriately programmed computers. In a unit claim listing several on-board systems, several of these on-board systems may be embodied by the same hardware item. The use of the words first, second, and third, etc. does not indicate any order. These words may be interpreted as names.

[0049] The above is only a specific implementation method or description of a specific implementation method of the present application, and the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. The protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A battery pack, characterized in that: It includes a shell, a battery module and a cover plate, wherein: The battery cell module is arranged inside the shell, the cover plate is detachably arranged on the first surface of the shell, and an adhesive layer is arranged between the battery cell module and the cover plate; The adhesive layer is arranged on the cover plate and the battery core module, magnetic substances are distributed in the adhesive layer, and the cover plate and the battery core module are detachably connected via the adhesive layer.

2. The battery pack according to claim 1, characterized in that: The adhesive layer includes a first adhesive layer and a second adhesive layer, the first adhesive layer is arranged on the second surface of the cover plate, the second adhesive layer is arranged on the first surface of the battery cell module, and the first adhesive layer is bonded to the second adhesive layer.

3. The battery pack according to claim 2, characterized in that: The first adhesive layer and the second adhesive layer are insulating resin layers.

4. The battery pack according to claim 3, characterized in that: The first bonding layer includes a magnetically sensitive adhesive, and the magnetic material is magnetically sensitive powder distributed in the magnetically sensitive adhesive.

5. The battery pack according to claim 3, characterized in that: The thickness of the first adhesive layer and / or the second adhesive layer is 200 μm to 2 mm.

6. The battery pack according to any one of claims 1 to 5, characterized in that: The area of ​​the connection surface between the adhesive layer and the cover plate is greater than 30% of the area of ​​the second surface of the cover plate.

7. The battery pack according to claim 4, characterized in that: The particle size of the magnetically sensitive powder is 5nm-100μm.

8. The battery pack according to any one of claims 1 to 5, characterized in that: The battery cell module includes a plurality of stacked battery cells, and the battery cells are soft-pack batteries, cylindrical batteries or square batteries.

9. The battery pack according to any one of claims 1 to 5, characterized in that: It also includes a bottom plate, which includes a bottom guard plate and a liquid cooling plate. The bottom guard plate and the liquid cooling plate are arranged on the shell, and the liquid cooling plate is located between the shell and the bottom guard plate.

10. The battery pack according to claim 9, characterized in that: The battery module is provided with a thermally conductive adhesive, the thermally conductive adhesive is located between the liquid cooling plate and the battery module, and the thermally conductive adhesive is bonded to the second surface of the battery module.

11. An electrical device, characterized in that: The electrical device comprises the battery pack according to any one of claims 1-10.

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