Power battery pack and electric device

Abstract

The application provides a power battery pack and a power-using equipment, and relates to the technical field of power batteries. The power battery pack comprises: a plurality of battery monomers, which have oppositely arranged large surfaces, and the upper end of each battery monomer is provided with an output pole; and a liquid cooling assembly, which is arranged at the large surface and has an extension part extending along the left-right direction, and the extension part is arranged to support at least part of the structure of the lower end of the battery monomer. The battery monomer is provided with the large surface, and the liquid cooling assembly is arranged at the large surface to conduct heat and reduce the probability of thermal runaway. Meanwhile, the liquid cooling assembly is provided with the extension part along the left-right direction, and the extension part is located at the lower end of the battery monomer, so that the battery monomer can be supported when assembled, the stress of the whole power battery pack is more uniform, and the safety of the whole power battery pack is improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. In this context, electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the automotive industry's sustainable development. And for electric vehicles, battery technology is a crucial factor in their development.

[0003] In the development of battery technology, besides battery performance, safety is also a crucial issue that cannot be ignored. If battery safety cannot be guaranteed, then the battery is unusable. Therefore, how to enhance battery safety is a pressing technical problem that needs to be solved in battery technology. Summary of the Invention

[0004] The purpose of this application is to provide a power battery pack and electrical equipment that can improve product safety.

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

[0006] In a first aspect, this application provides a power battery pack, comprising: a plurality of battery cells having large surfaces arranged opposite to each other, and an output terminal post disposed at the upper end of the battery cells; a liquid cooling assembly disposed at the large surfaces, and an extension portion of the liquid cooling assembly extending in a left-right direction, the extension portion being configured to support at least a portion of the lower end of the battery cells.

[0007] In the above implementation process, the battery cell has a large surface area, and a liquid cooling component is installed on the large surface area to conduct heat and reduce the probability of thermal runaway. At the same time, the liquid cooling component has an extension in the left and right direction. This extension is located at the lower end of the battery cell, so that the battery cell can be supported during assembly, making the overall force of the power battery pack more uniform and thus improving the overall safety.

[0008] In some embodiments, the liquid cooling assembly includes a liquid cooling plate and an extension plate, the extension plate being connected to the lower end of the liquid cooling plate, and the length direction of the liquid cooling plate being consistent with the length direction of the extension plate.

[0009] In the above process, the extension plate is set below the liquid cooling plate. The liquid cooling plate can conduct heat to the battery cell, and the extension plate can serve as a stress-bearing structure for the battery cell, ensuring that the stress on the entire structure is more uniform and improving the safety and service life of the product.

[0010] In some embodiments, the power battery pack further includes a housing structure having a receiving cavity configured to receive the battery cells and the liquid cooling assembly.

[0011] In the above implementation process, the housing structure can accommodate the battery cells and liquid cooling components, and the housing structure and liquid cooling components can support the battery cells respectively, reducing the bottom strength requirements of the housing structure, making the entire structure of the power battery pack more uniformly stressed, which is beneficial to the safety and service life of the power battery pack.

[0012] In some embodiments, the housing structure includes a housing frame and a bottom plate, the bottom plate being connected to the lower end of the housing frame, and the housing frame being configured to support a portion of the liquid cooling assembly, and the bottom plate being configured to support a portion of the liquid cooling assembly and the battery cell.

[0013] In the above implementation process, the housing frame and the lower base plate can support the liquid cooling components respectively, and the lower base plate can support the battery cells. This ensures that when the battery cells and liquid cooling components are assembled in the housing cavity of the housing structure, the force on the power battery pack can be more balanced, thereby reducing the strength requirements of the lower base plate and improving the safety and lifespan of the power battery pack.

[0014] In some embodiments, the lower base plate includes a base plate body, a first convex surface and a second convex surface. The first convex surface is disposed on the side of the base plate body close to the battery cell and is configured to support the extension. The second convex surface is disposed on the side of the first convex surface away from the base plate body and is configured to support the battery cell.

[0015] In the above implementation process, the first convex surface is disposed on the base plate body, and the second convex surface is disposed on the side of the first convex surface away from the base plate body. The first convex surface can support the liquid cooling component, and the extension of the liquid cooling component and the second convex surface can support the lower end of the battery cell respectively. The liquid cooling component can be supported by the housing frame, thereby ensuring that the force on the entire power battery pack is more balanced.

[0016] In some embodiments, the second convex surface is provided with a plurality of spaced portions along the left-right direction, such that the first convex surface forms a support surface for supporting the battery cell on two adjacent second convex surfaces.

[0017] In the above implementation process, the two adjacent second convex surfaces are spaced apart, so that the liquid cooling component can be located between the two second convex surfaces and supported by the first convex surface. This is beneficial to make full use of the space of the housing structure and increase the capacity of the power battery pack.

[0018] In some embodiments, structural adhesive is provided between the second convex surface and the battery cell. The use of structural adhesive not only facilitates the assembly of the battery cell and improves assembly efficiency, but also ensures the stability of the connection between the second convex surface and the battery cell.

[0019] In some embodiments, the housing frame is provided with support bars along the left-right direction. The support bars are disposed on the outer edge of the first convex surface, and the height of the support bars is not higher than the height of the first convex surface, so as to provide support for the liquid cooling assembly.

[0020] In the above implementation process, support bars are provided on the housing frame. The support bars can support the liquid cooling components. The liquid cooling components can support part of the weight of the battery cells through the support bars, thereby reducing the stress on the bottom plate and ensuring that the overall stress of the power battery pack is uniform, thus improving the safety and lifespan of the product.

[0021] In some embodiments, a gap is provided between the inner edge of the housing frame and the outermost battery cell. By spacing the battery cells from the inner edge of the housing frame, it can be ensured that the power battery pack can absorb energy through the gap when it is impacted, reducing damage to the battery cells and improving product safety.

[0022] Secondly, this application also provides an electrical device, including a power battery pack as described in any of the above claims.

[0023] Since the electrical equipment provided in the second aspect of this application includes the power battery pack described in the first aspect of the technical solution, it has all the technical effects of the above-mentioned embodiments, which will not be repeated here.

[0024] 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

[0025] 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.

[0026] Figure 1 This is a schematic diagram of the structure of a power battery pack disclosed in an embodiment of this application.

[0027] Figure 2 This is a top view of a power battery pack disclosed in an embodiment of this application.

[0028] Figure 3 yes Figure 2 A sectional view.

[0029] Figure 4 yes Figure 3 A magnified view of a portion of the image.

[0030] Figure 5 This is a partial structural schematic diagram of a power battery pack disclosed in an embodiment of this application.

[0031] Figure 6 This is a schematic diagram of the structure of a liquid cooling component for a power battery pack disclosed in an embodiment of this application.

[0032] Figure 7 This is a schematic diagram of the housing structure of a power battery pack disclosed in an embodiment of this application.

[0033] Figure 8 This is a schematic diagram of the structure of the lower base plate of a power battery pack disclosed in an embodiment of this application.

[0034] Figure Labels

[0035] 100. Battery cell; 200. Liquid cooling assembly; 201. Liquid cooling plate; 202. Extension plate; 300. Housing frame; 301. Support bar; 400. Lower base plate; 401. Base plate body; 402. First convex surface; 403. Second convex surface; 500. Upper cover plate. Detailed Implementation

[0036] 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.

[0037] 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.

[0038] 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.

[0039] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "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 utility model product is in use. They are 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," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0040] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0041] 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.

[0042] Example

[0043] In this application, the battery cell may be a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and the embodiments of this application are not limited to this.

[0044] A single battery cell includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrodes. The positive electrode includes a positive current collector and a positive active material layer, the latter coated on the surface of the current collector. The current collector includes a current-collecting portion and a tab protruding from it. The current-collecting portion is coated with the positive active material layer, while at least a portion of the tab is not coated with the active material layer. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material layer includes the active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer, the negative active material layer being coated on the surface of the negative current collector. The negative current collector includes a negative current collection portion and a negative electrode tab protruding from the negative current collection portion. The negative current collection portion is coated with the negative active material layer, while at least a portion of the negative electrode tab is not coated with the negative active material layer. The material of the negative current collector can be copper, and the negative active material layer includes a negative active material, which can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0045] For elongated battery cells, liquid cooling plates are now located at the bottom, top, or large surface of the battery cell. In battery packs where the liquid cooling plate is located on the large surface of the battery cell, the liquid cooling plate is not subjected to force. This results in the entire battery cell, weighing 300 to 600 kilograms, having to be pressed against the bottom surface of the battery pack. This requires a very high strength for the bottom surface, which is detrimental to the lifespan and safety of the battery pack.

[0046] In view of this, such as Figures 1-6 As shown, in a first aspect, this application provides a power battery pack, including: a battery cell 100 and a liquid cooling component 200. The liquid cooling component 200 is disposed on the large surface of the battery cell 100 to conduct heat to the battery cell 100. At the same time, the liquid cooling component 200 can support the battery cell 100, thereby reducing the stress on the bottom surface of the power battery pack.

[0047] Specifically, a plurality of battery cells 100 have large surfaces arranged opposite to each other, and an output terminal is disposed at the upper end of the battery cell 100; a liquid cooling assembly 200 is disposed at the large surface, and the liquid cooling assembly 200 has an extension extending in the left-right direction, the extension being configured to support at least a portion of the lower end of the battery cell 100.

[0048] For example, the battery cell 100 can be configured as a strip or the like, and the upper end of the battery cell 100 is provided with the output terminal, which is a positive and a negative terminal. The length direction of the battery cell 100 is configured as a front-to-back direction, and several battery cells 100 are spaced apart in the left-to-right direction. The liquid cooling component 200 is disposed on two large surfaces of the battery cell 100, and the length direction of the liquid cooling component 200 is configured as the front-to-back direction to conduct heat to the battery cell 100. It can be understood that the upper height of the liquid cooling component 200 is not higher than the height of the large surface of the battery cell 100.

[0049] In the above implementation process, the battery cell 100 is provided with a large surface, and a liquid cooling component 200 is provided on the large surface to conduct heat and reduce the probability of thermal runaway. At the same time, the liquid cooling component 200 is provided with an extension in the left and right direction. This extension is located at the lower end of the battery cell 100, so that the battery cell 100 can be supported when it is assembled, making the overall force of the power battery pack more uniform and thus improving the overall safety.

[0050] like Figures 5-6 As shown, the liquid cooling assembly 200 includes a liquid cooling plate 201 and an extension plate 202. The extension plate 202 is connected to the lower end of the liquid cooling plate 201, and the length direction of the liquid cooling plate 201 is consistent with the length direction of the extension plate 202. For example, the liquid cooling plate 201 and the extension plate 202 can be integrally formed or fixed by welding, so that the liquid cooling assembly 200 forms a T-shape or an L-shape. It should be noted that the liquid cooling plate 201 has a cooling cavity, which can be used to contain coolant. Through the flow of coolant, heat conduction to the battery cell 100 is achieved. The extension plate 202 can be used directly for support, or it can be configured with channels containing coolant, so that the extension plate 202 can not only support the battery cell 100 but also cool it.

[0051] In the above implementation process, the extension plate 202 is disposed below the liquid cooling plate 201. The liquid cooling plate 201 can conduct heat to the battery cell 100, and the extension plate 202 can serve as a stress-bearing structure for the battery cell 100, ensuring that the entire structure is subjected to more uniform stress and improving the safety and service life of the product.

[0052] like Figures 7-8As shown, the power battery pack also includes a housing structure with a receiving cavity configured to accommodate the battery cell 100 and the liquid cooling assembly 200. The size of the housing structure can be set according to actual conditions and is not specifically limited here; wherein the housing structure can accommodate the battery cell 100 and the liquid cooling assembly 200, and the housing structure and the liquid cooling assembly 200 can respectively support the battery cell 100, reducing the bottom strength requirement of the housing structure, making the entire structure of the power battery pack more evenly stressed, which is beneficial to the safety and service life of the power battery pack.

[0053] Please refer to again Figure 7 and Figure 8 The housing structure includes a housing frame 300 and a lower base plate 400. The lower base plate 400 is connected to the lower end of the housing frame 300, and the housing frame 300 is configured to support part of the liquid cooling assembly 200. The lower base plate is configured to support part of the liquid cooling assembly 200 and the battery cell 100. For example, the housing structure further includes an upper cover plate 500, which is disposed at the upper end of the housing frame 300. The housing cavity is formed by the upper cover plate 500, the lower bottom plate 400, and the housing frame 300. The lower bottom plate 400 can be welded to the bottom of the housing frame 300. The housing frame 300 and the lower bottom plate 400 can support the liquid cooling component 200 respectively, and the lower bottom plate 400 can support the battery cell 100. This ensures that when the battery cell 100 and the liquid cooling component 200 are assembled in the housing cavity of the housing structure, the force on the power battery pack can be more balanced, thereby reducing the strength requirements of the lower bottom plate 400 and improving the safety and lifespan of the power battery pack.

[0054] like Figure 8As shown, the lower base plate 400 includes a base plate body 401, a first convex surface 402, and a second convex surface 403. The first convex surface 402 is disposed on the side of the base plate body 401 close to the battery cell 100 and is configured to support the extension. The second convex surface 403 is disposed on the side of the first convex surface 402 away from the base plate body 401 and is configured to support the battery cell 100. Specifically, the outer edge of the first convex surface 402 is smaller than the outer edge of the base plate body 401, and the outer edge of the second convex surface 403 is smaller than the outer edge of the first convex surface 402. That is, the outer edge of the first convex surface 402 is entirely located on the upper surface of the base plate body 401, and the outer edge of the second convex surface 403 is entirely adjacent to the upper surface of the first convex surface 402. The first convex surface 402 protrudes from the base plate body 401, and the second convex surface 403 protrudes from the first convex surface 402. The base plate body 401, the first convex surface 402, and the second convex surface 403 can all be fixed by welding or by integral molding, etc.

[0055] In the above implementation process, the first convex surface 402 is disposed on the base plate body 401, and the second convex surface 403 is disposed on the side of the first convex surface 402 away from the base plate body 401. The first convex surface 402 can support the liquid cooling plate 201 assembly. At the same time, the extension of the liquid cooling assembly 200 and the second convex surface 403 can respectively support the lower end of the battery cell 100. The liquid cooling assembly 200 can be supported by the housing frame 300, thereby ensuring that the force on the entire power battery pack is more balanced.

[0056] In some embodiments, the second convex surface 403 is provided with a plurality of spaced portions along the left-right direction, such that the first convex surface 402 forms a support surface for supporting the battery cell 100 in two adjacent second convex surfaces 403. The adjacent two second convex surfaces 403 are spaced apart, so that the liquid cooling component 200 can be located between the two second convex surfaces 403 and supported by the first convex surface 402, which is beneficial to make full use of the space of the housing structure and improve the capacity of the power battery pack.

[0057] In some embodiments, structural adhesive is provided between the second convex surface 403 and the battery cell 100. That is, the height of the second convex surface 403 is lower than the height of the extension plate 202, so that the structural adhesive can be accommodated between the second convex surface 403 and the battery cell 100. By providing structural adhesive, not only is it beneficial to assemble the battery cell 100 and improve assembly efficiency, but it can also ensure the stability of the connection between the second convex surface 403 and the battery cell 100.

[0058] like Figure 7As shown, the housing frame 300 is provided with support bars 301 along the left-right direction. The support bars 301 are disposed on the outer edge of the first convex surface 402, and the height of the support bars 301 is not higher than the height of the first convex surface 402, so as to provide support for the liquid cooling plate 201 assembly. For example, two support bars 301 are provided, one of which is provided on the front side of the housing frame 300, and the other of which is provided on the rear side of the housing frame 300, so as to support the front and rear ends of the liquid cooling assembly 200 respectively.

[0059] In the above implementation process, a support bar 301 is provided on the housing frame 300. The support bar 301 can support part of the liquid cooling component 200. The liquid cooling component 200 can support part of the weight of the battery cell 100 by the support bar 301, thereby reducing the stress on the bottom plate 400, ensuring the overall stress of the power battery pack is uniform, and thus improving the safety and life of the product.

[0060] like Figures 3-4 As shown, a gap is provided between the inner edge of the housing frame 300 and the outermost battery cell 100. That is, there is a gap between the liquid cooling component 200 located on the leftmost and rightmost sides and the housing frame 300. By setting the battery cell 100 and the inner edge of the housing frame 300 at intervals, it can be ensured that the power battery pack can absorb energy through the gap when it is hit, thereby reducing damage to the battery cell 100 and improving the safety of the product.

[0061] Secondly, this application also provides an electrical device, including a power battery pack as described in any of the above claims. The electrical device can be a vehicle, mobile phone, portable device, laptop computer, ship, spacecraft, electric toy, and power tool, etc. Vehicles can be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc.; spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose special limitations on the above-mentioned electrical devices. Taking a vehicle as an example, the vehicle may also include a controller and a motor. The controller is used to control the power battery to supply power to the motor, for example, for the power needs of starting, navigation, and driving the vehicle.

[0062] Since the electrical equipment provided in the second aspect of this application includes the power battery pack described in the first aspect of the technical solution, it has all the technical effects of the above-mentioned embodiments, which will not be repeated here.

[0063] 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 power battery pack, characterized in that, include: Several battery cells have large surfaces arranged opposite each other, and the upper end of each battery cell is provided with an output terminal. A liquid cooling assembly disposed on the large surface, and an extension of the liquid cooling assembly extending in the left-right direction, the extension being configured to support at least a portion of the lower end of the battery cell. The power battery pack also includes a housing structure having a receiving cavity configured to accommodate the battery cells and the liquid cooling assembly. The housing structure includes a bottom plate, which is configured to support a portion of the liquid cooling assembly and the battery cell. The lower base plate includes a base plate body, a first convex surface and a second convex surface. The first convex surface is disposed on the side of the base plate body close to the battery cell and is configured to support the extension. The second convex surface is disposed on the side of the first convex surface away from the base plate body and is configured to support the battery cell. Structural adhesive is provided between the second convex surface and the battery cell.

2. The power battery pack according to claim 1, characterized in that, The liquid cooling assembly includes a liquid cooling plate and an extension plate. The extension plate is connected to the lower end of the liquid cooling plate, and the length direction of the liquid cooling plate is consistent with the length direction of the extension plate.

3. The power battery pack according to claim 1, characterized in that, The enclosure structure includes an enclosure frame, the bottom plate is connected to the lower end of the enclosure frame, and the enclosure frame is configured to support the liquid cooling assembly.

4. The power battery pack according to claim 3, characterized in that, The second convex surface is provided with a plurality of spaced portions along the left-right direction, such that the first convex surface forms a support surface for supporting the battery cell on two adjacent second convex surfaces.

5. The power battery pack according to claim 3, characterized in that, The housing frame is provided with support bars along the left and right directions. The support bars are disposed on the outer edge of the first convex surface, and the height of the support bars is not higher than the height of the first convex surface, so as to provide support for the liquid cooling assembly.

6. The power battery pack according to claim 3, characterized in that, A gap is provided between the inner edge of the housing frame and the outermost battery cell.

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

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