Battery pack and electric device

Abstract

The application provides a battery pack and a power utilization equipment, and relates to the technical field of power batteries. The battery pack comprises: a plurality of battery cells, which are provided with a first connecting end and a second connecting end arranged adjacently or oppositely, and the first connecting end is configured to be used for charging and discharging; and a graphite sheet structure, which is arranged on one side of the battery cell, and at least a part of the structure of the graphite sheet structure is configured to be detachably connected with the second connecting end. The battery cell is provided with the second connecting end adjacent to or opposite to the first connecting end, and the graphite sheet structure is arranged to be detachably connected with the second connecting end, so that the detachability between the battery cell and the graphite sheet structure can be facilitated, the blue film insulating layer of the battery cell is not damaged, and the maintainability is effectively improved.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and more specifically, to a battery pack and electrical equipment. Background Technology

[0002] The battery pack is the power source of an electric vehicle, and its smallest unit is the battery cell. Currently, there are two main structural methods in the market: MTP (Module to Pack) and CTP (Cell to Pack). Traditional MTP battery packs consist of batteries and modules assembled into a battery pack. Multiple cells form a module, and multiple modules, along with components such as the BMS and counterweight module, are combined to form the battery pack. In the MTP structure, the cells are fully protected by external structural components, resulting in good structural strength and easier assembly. CTP, compared to MTP, eliminates the intermediate module stage. CTP technology directly assembles the cells into a pack, skipping the traditional module assembly step. The cells are first integrated into the battery pack and then installed onto the vehicle body. Essentially, this is to improve energy density and reduce costs.

[0003] In related technologies, CTP battery packs have high weight packing efficiency, but their overall rigidity is relatively poor. Currently, they are coated with structural thermal conductive adhesive and then directly pasted to the lower casing. When it is necessary to disassemble them, even with special tools, there is a risk of leakage, thermal runaway, etc., and they cannot be disassembled or replaced with new cells. Summary of the Invention

[0004] The purpose of this application is to provide a battery pack and electrical device that allows for the disassembly of battery cells, thereby effectively improving maintainability.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] In a first aspect, this application provides a battery pack, comprising: a plurality of battery cells having a first connection end and a second connection end arranged adjacent to or opposite to each other, the first connection end being configured for charging and discharging; a graphite sheet structure disposed on one side of the battery cells, and at least a portion of the graphite sheet structure being configured to be detachably connected to the second connection end.

[0007] In the above implementation process, the battery cell is provided with a second connection end that is adjacent to or opposite to the first connection end, and the graphite sheet structure is configured to be detached and connected to the second connection end, which facilitates the disassembly of the battery cell and the graphite sheet structure without damaging the blue film insulation layer of the battery cell, effectively improving maintainability.

[0008] In some embodiments, the graphite sheet structure is recessed along a direction away from the battery cell, and the mounting groove is configured to accommodate a portion of the battery cell structure.

[0009] In the above process, the graphite sheet structure is provided with mounting slots for connecting battery cells, which facilitates dispensing and positioning of the mounting slots and enables automated dispensing, improving work efficiency and facilitating the fixing of battery cells.

[0010] In some embodiments, the battery pack further includes a first adhesive, which is disposed within the mounting groove and located between the graphite sheet structure and the battery cell, for forming a detachable connection between the battery cell and the graphite sheet structure.

[0011] In the above process, the first fixing adhesive is placed in the mounting groove so that when the battery cell is wiped and disassembled, the graphite sheet structure and the area below it can be retained for secondary use without damaging the original heat dissipation structure and the blue film insulation layer of the battery cell. This facilitates the disassembly and analysis of faulty battery cells, improves safety, and avoids phenomena such as leakage and thermal runaway.

[0012] In some embodiments, the battery pack further includes a liquid cooling structure disposed on the side of the graphite sheet structure away from the battery cell and fixedly connected to the graphite sheet structure.

[0013] In the above process, the battery cell is connected to the liquid cooling structure through a graphite sheet structure, so that when the battery cell is disassembled, the connection between the liquid cooling structure and the graphite sheet structure can be preserved, and the heat dissipation structure composed of the liquid cooling structure and the graphite sheet structure will not be damaged. It can be reused and the cost is greatly reduced.

[0014] In some embodiments, the battery pack further includes a second adhesive with greater adhesive strength than the first adhesive. The second adhesive is disposed between the liquid cooling structure and the graphite sheet structure to form a fixation between the liquid cooling structure and the graphite sheet structure.

[0015] In the above process, the adhesive strength of the second fixing adhesive is greater than that of the first fixing adhesive, which facilitates the disassembly and analysis of faulty cells during cell removal, while preserving the connection between the graphite sheet structure and the liquid cooling structure, thus significantly reducing costs.

[0016] In some embodiments, a filling groove is provided around the periphery of the graphite sheet structure, and the filling groove is filled with the second fixing adhesive. The filling groove facilitates the positioning of the second fixing adhesive, thereby enabling automated dispensing and improving work efficiency.

[0017] In some embodiments, the filling groove is disposed on the outer edge of the mounting groove. This ensures a stable and consistent connection between the battery cell and the graphite sheet structure, avoids damage during battery cell removal, and improves product safety.

[0018] In some embodiments, the battery pack further includes an end plate disposed at the outer edge of the cell, and at least a portion of the end plate has a structure in contact with the graphite sheet structure.

[0019] In some embodiments, the graphite sheet has mounting holes spaced apart around its periphery, the mounting holes being located below the end plate for fixing the graphite sheet structure to the end plate.

[0020] Secondly, this application also provides an electrical device including a battery pack as described in any of the above claims.

[0021] The electrical equipment provided in the second aspect of this application includes the battery pack described in the first aspect of the technical solution, and therefore has all the technical effects of the above-described embodiments, which will not be repeated here.

[0022] Other features and advantages of this application will be set forth in the following description and will be apparent in part from the description or may be learned by practicing embodiments of this application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For users of ordinary skills in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a battery pack disclosed in an embodiment of this application.

[0025] Figure 2 This is a schematic diagram of the graphite sheet structure of a battery pack disclosed in an embodiment of this application.

[0026] Figure Labels

[0027] 100, Battery cell; 200, Graphite sheet structure; 201, Mounting groove; 202, Filling groove; 203, Mounting hole; 300, Liquid cooling structure; 400, End plate. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by users of ordinary skill in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] Example

[0034] At present, based on the maturity of technology and process and processing costs, the mainstream new energy vehicles at home and abroad all adopt the stamped liquid cooling plate solution based on the CTP structure of the power battery pack. This CTP integration solution has the advantage of high assembly efficiency, specifically: (1) the cold plate is used as the bottom plate of the battery pack, which effectively reduces the Z-axis space; (2) in terms of thermal management efficiency, the flow channel has a large contact area, which can effectively reduce the temperature difference between the inside and outside of the battery cell, and provide better protection for the battery during fast charging and discharging and low temperature preheating. In addition, the stamped liquid cooling plate is integrated as a separate part on the outside of the power battery pack, which saves space and reduces costs. Moreover, it can achieve dry and wet separation. If the coolant leaks, it will not come into contact with high-voltage components such as modules and busbars to form a short circuit, and will not cause safety accidents such as battery pack short circuit and fire. In the long run, it is very beneficial to the development requirements of new energy vehicles.

[0035] During the design process, the inventors discovered that while CTP battery packs have high weight-packing efficiency, their overall pack rigidity is relatively poor. The current method involves creating windows in the bottom insulating film of the cells, applying a structural thermally conductive adhesive, and then directly attaching it to the lower casing. Under complex vibration and impact conditions, part of the cell's inertial force is transferred through the bottom structural thermally conductive adhesive to the lower casing crossbeam, and then to the pack mounting point; the other part is transferred through the end plate to the pack mounting point, thus improving the CTP battery pack rigidity.

[0036] The disadvantages of this method are: the adhesive strength of the structural thermally conductive adhesive is very strong, making it difficult to disassemble the battery cells. Even with special tools, it is easy to cause risks such as leakage and thermal runaway. If a battery cell has problems such as large voltage difference or low capacity, it is impossible to disassemble and replace it with a new cell, and the entire battery pack will have to be scrapped. Its production and after-sales maintenance costs are very high, which is not conducive to the development of new energy vehicles and the future recycling of battery packs.

[0037] In view of this, such as Figure 1 As shown, in a first aspect, this application provides a battery pack, including: a plurality of battery cells 100 having a first connection end and a second connection end arranged adjacent to or opposite to each other, the first connection end being configured for charging and discharging; a graphite sheet structure 200 disposed on one side of the battery cells 100, and at least a portion of the structure of the graphite sheet structure 200 being configured to be detachably connected to the second connection end.

[0038] For example, the graphite sheet structure 200 is a novel thermally conductive and heat-dissipating material with a unique grain orientation, uniformly conducting heat in both directions. Its layered structure adapts well to any surface, shielding heat sources and components while improving the performance of consumer electronics. This novel natural graphite solution offers high heat dissipation efficiency, a small footprint, and light weight, while uniformly conducting heat in both directions, eliminating "hot spot" areas.

[0039] It is understood that the battery cell 100 can be a blade battery cell 100, a pouch battery cell 100, a cylindrical battery cell 100, a hard-shell battery cell 100, etc. For example, when the battery cell 100 is a pouch battery cell 100, the first connection end can be set on the side of the battery cell 100 so that the wire harness isolation plate is connected to the side of the battery cell 100, etc.

[0040] In the above implementation process, the battery cell 100 is provided with a second connection end that is adjacent to or opposite to the first connection end, and the graphite sheet structure 200 is configured to be detached from the second connection end, which facilitates the disassembly between the battery cell 100 and the graphite sheet structure 200 without damaging the blue film insulation layer of the battery cell 100, and effectively improves maintainability.

[0041] like Figure 2 As shown, the graphite sheet structure 200 has a recessed mounting groove 201 along the direction away from the battery cell 100. The mounting groove 201 is configured to accommodate a portion of the battery cell 100. For example, the mounting groove 201 can be square or other shapes, and the depth and size of the mounting groove 201 can be set according to the actual situation, which will not be elaborated here.

[0042] In the above implementation process, the graphite sheet structure 200 is provided with a mounting groove 201 for connecting the battery cell 100, which can facilitate the dispensing and positioning of the mounting groove 201, and can perform automated dispensing process, improving work efficiency and facilitating the fixing of the battery cell 100.

[0043] In some embodiments, the battery pack further includes a first fixing adhesive disposed within the mounting groove 201 and located between the graphite sheet structure 200 and the battery cell 100, for forming a detachable connection between the battery cell 100 and the graphite sheet structure 200. Exemplarily, the first fixing adhesive includes, but is not limited to, a thermally conductive gel, which has weaker adhesive strength compared to a thermally conductive structural adhesive. This allows the graphite sheet structure 200 and its underlying area to be preserved for reuse when the battery cell 100 is removed, thus avoiding damage to the original heat dissipation structure. Furthermore, due to the weak adhesive strength of the thermally conductive gel, the blue film insulation layer of the battery cell 100 will not be damaged when it is removed, facilitating the disassembly and analysis of faulty battery cells 100.

[0044] In the above process, the first fixing adhesive is placed in the mounting groove 201 so that when the battery cell 100 is wiped and disassembled, the graphite sheet structure 200 and the area below it can be retained for secondary use, and the original heat dissipation structure and the blue film insulation layer of the battery cell 100 will not be damaged. This facilitates the disassembly and analysis of the faulty battery cell 100, improves safety, and avoids phenomena such as leakage and thermal runaway.

[0045] In some embodiments, the battery pack further includes a liquid cooling structure 300, which includes, but is not limited to, a liquid cooling plate. The liquid cooling structure 300 and the graphite sheet structure 200 together form a heat dissipation structure that can dissipate heat for the battery cell 100. The liquid cooling structure 300 is disposed on the side of the graphite sheet structure 200 away from the battery cell 100 and is fixedly connected to the graphite sheet structure 200.

[0046] In the above process, the battery cell 100 is connected to the liquid cooling structure 300 through the graphite sheet structure 200, so that when the battery cell 100 is disassembled, the connection between the liquid cooling structure 300 and the graphite sheet structure 200 can be preserved, and the heat dissipation structure composed of the liquid cooling structure 300 and the graphite sheet structure 200 will not be damaged, so it can be reused and the cost is greatly reduced.

[0047] In some embodiments, the battery pack further includes a second fixing adhesive, which includes, but is not limited to, a thermally conductive structural adhesive. The second fixing adhesive has greater adhesive strength than the first fixing adhesive. The second fixing adhesive is disposed between the liquid cooling structure 300 and the graphite sheet structure 200 to form a fixation between the liquid cooling structure 300 and the graphite sheet structure 200.

[0048] In the above process, the adhesive strength of the second fixing adhesive is greater than that of the first fixing adhesive, which facilitates the disassembly and analysis of the faulty battery cell 100 during the removal of the battery cell 100, while maintaining the connection between the graphite sheet structure 200 and the liquid cooling structure 300, thus significantly reducing costs.

[0049] Please refer to again Figure 2 The graphite sheet structure 200 has a filling groove 202 around its periphery, which is filled with the second fixing adhesive. At least four filling grooves 202 are provided, spaced apart at the four corners of the graphite sheet structure 200. The size and shape of the filling grooves 202 are not specifically limited and can be set according to actual conditions. The filling grooves 202 facilitate the positioning of the second fixing adhesive, thereby enabling automated dispensing and improving work efficiency.

[0050] In some embodiments, the filling groove 202 is disposed on the outer edge of the mounting groove 201. This ensures a stable and consistent connection between the battery cell 100 and the graphite sheet structure 200, avoids damage during the removal of the battery cell 100, and improves product safety.

[0051] In some embodiments, the battery pack further includes an end plate 400, which is disposed on the outer edge of the battery cell 100, and at least a portion of the structure of the end plate 400 contacts the graphite sheet structure 200. The graphite sheet has mounting holes 203 spaced apart on its periphery. At least four mounting holes 203 are provided, spaced apart at the four corners of the graphite sheet structure 200. The mounting holes 203 are located below the end plate 400 for fixing the graphite sheet structure 200 to the end plate 400. For example, the end plate 400 can be fixed to the graphite sheet structure 200 using bolts, whereby the bolts are fitted with the mounting holes 203, and the end plate 400 is fastened to the graphite sheet structure 200 by tightening the bolts.

[0052] Secondly, this application also provides an electrical device including a battery pack as described in any of the foregoing claims. Exemplarily, the electrical device is a vehicle, which can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. The battery pack is disposed inside the vehicle, and can be located at the bottom, front, or rear of the vehicle. The battery pack can be used to power the vehicle; for example, the battery pack can serve as the vehicle's operating power source. The vehicle may also include a controller and a motor, the controller being used to control the battery pack to supply power to the motor, for example, for the vehicle's starting, navigation, and operating power needs.

[0053] The electrical equipment provided in the second aspect of this application includes the battery pack described in the first aspect of the technical solution, and therefore has all the technical effects of the above-described embodiments, which will not be repeated here.

[0054] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery pack, characterized in that, include: A plurality of battery cells having a first connection terminal and a second connection terminal arranged adjacent to or opposite to each other, wherein the first connection terminal is configured for charging and discharging; A graphite sheet structure is disposed on one side of the battery cell, and at least a portion of the graphite sheet structure is configured to be detachably connected to the second connection end. The graphite sheet structure is recessed in a direction away from the battery cell, and the mounting groove is configured to accommodate a portion of the battery cell structure. The battery pack also includes a first fixing adhesive, which is disposed in the mounting groove and located between the graphite sheet structure and the battery cell to form a detachable connection between the battery cell and the graphite sheet structure. The first fixing adhesive is a thermally conductive gel, and a blue film insulating layer is provided between the battery cell and the first fixing adhesive. The battery pack also includes a liquid cooling structure, which is disposed on the side of the graphite sheet structure away from the battery cell and is fixedly connected to the graphite sheet structure. The battery pack also includes a second fixing adhesive, the second fixing adhesive having greater adhesive strength than the first fixing adhesive. The second fixing adhesive is disposed between the liquid cooling structure and the graphite sheet structure to form a fixation between the liquid cooling structure and the graphite sheet structure. The second fixing adhesive is a thermally conductive structural adhesive.

2. The battery pack according to claim 1, characterized in that, The graphite sheet structure has a filling groove around its periphery, and the filling groove is filled with the second fixing adhesive.

3. The battery pack according to claim 2, characterized in that, The filling groove is disposed on the outer edge of the mounting groove.

4. The battery pack according to claim 1, characterized in that, The battery pack also includes an end plate disposed on the outer edge of the cell, and at least a portion of the structure of the end plate is in contact with the graphite sheet structure.

5. The battery pack according to claim 4, characterized in that, The graphite sheet has mounting holes spaced apart around its periphery. These mounting holes are located below the end plate and are used to fix the graphite sheet structure to the end plate.

6. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1-5.

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