Battery pack and electric device

Abstract

The application relates to a battery pack and an electric device. The battery pack comprises at least one single-layer module. The single-layer module comprises a battery module, end plates, a first reinforcing member and a second reinforcing member. The battery module comprises a plurality of battery modules. The battery module comprises two first surfaces arranged oppositely along a first direction and two second surfaces arranged oppositely along a second direction. The number of end plates is two. The two end plates are located on the two sides of the battery module in the first direction. The first reinforcing member is located on one side of the battery module in a third direction. The first reinforcing member is connected to the two end plates. The first direction, the second direction and the third direction are arranged to intersect each other. The second reinforcing member is connected to the two end plates. The second reinforcing member comprises a first reinforcing part and a second reinforcing part connected to each other. The first reinforcing member and the first reinforcing part are located on the same side of the battery module. The second reinforcing part is located on one side of the battery module in the second direction.

Description

Technical Field

[0001] This application relates to the field of energy storage device technology, and in particular to a battery pack and electrical equipment. Background Technology

[0002] New energy aviation power batteries are crucial for the aviation industry to achieve a green and low-carbon transformation and the large-scale development of the low-altitude economy. As a key component of electric aircraft, the performance of aviation power batteries directly determines the range, payload efficiency, safety, and economy of electric aircraft. Therefore, the requirements for high energy density, high discharge rate, high safety, and fast charging capability of aviation power batteries are far more stringent than those in the automotive industry.

[0003] To achieve longer driving range and meet the high power output requirements of aircraft during takeoff and acceleration, the energy density of some advanced aviation power batteries has reached a high level. With the use of high energy density cells in high discharge rate and fast charging scenarios, higher requirements are placed on the safety caused by cell expansion.

[0004] Related technologies use end plates at both ends of the battery module to constrain cell expansion. However, this constraint method has low structural strength and fails to effectively solve the problem of excessive deformation of the end plates caused by cell expansion. This still leads to safety issues such as tearing of cell connection plates and weld seams. Utility Model Content

[0005] Therefore, it is necessary to provide a battery pack and electrical equipment that reduces the risk of battery module expansion and deformation in response to the above-mentioned technical problems.

[0006] An embodiment of this application provides a battery pack including at least one single-layer module. The single-layer module includes a battery module, end plates, a first reinforcing member, and a second reinforcing member. Multiple battery modules are included, each comprising two first surfaces disposed opposite each other along a first direction and two second surfaces disposed opposite each other along a second direction. Two end plates are provided, each located on one side of the battery module in the first direction. The first reinforcing member is located on one side of the battery module in a third direction and connects the two end plates. The first direction, second direction, and third direction intersect each other. The second reinforcing member connects the two end plates and includes a first reinforcing portion and a second reinforcing portion connected to each other. The first reinforcing member and the first reinforcing portion are located on the same side of the battery module, and the second reinforcing portion is located on one side of the battery module in the second direction.

[0007] In one embodiment, there are two second reinforcing members, and the second reinforcing parts of the two second reinforcing members are respectively located on both sides of the battery module in the second direction.

[0008] In one embodiment, there are multiple first reinforcing members, each located between two second reinforcing members.

[0009] In one embodiment, the distance between any two adjacent first reinforcing members is L1, and the distance between the second reinforcing member and the adjacent first reinforcing member is L2, and L1 is equal to L2.

[0010] In one embodiment, the single-layer module further includes: a central support plate located between two end plates, the end plates and the central support plate being arranged parallel to each other along a first direction, and battery modules being provided on both sides of the central support plate in the first direction; at least one of the first reinforcing member and the second reinforcing member being connected to the central support plate.

[0011] In one embodiment, at least a portion of the battery module is bonded to the first reinforcement and / or the second reinforcement.

[0012] In one embodiment, the area of ​​the first surface is greater than the area of ​​the second surface.

[0013] In one embodiment, the first reinforcing member, the first reinforcing portion, and the second reinforcing portion all extend along a first direction.

[0014] In one embodiment, there are multiple single-layer modules, which are stacked along a third direction.

[0015] An embodiment of the second aspect of this application provides an electrical device including the battery pack of any of the above embodiments.

[0016] The battery pack provided in this application improves the structural strength of the end plates by providing a first and a second reinforcing member connecting the two end plates, thereby increasing the constraint force of the end plates on the battery module in the first direction and reducing the risk of expansion and deformation of the battery module in the first direction. By positioning both the first reinforcing member and the first reinforcing portion on one side of the battery module in the third direction, the first reinforcing member and the first reinforcing portion can directly constrain the battery module in the third direction, thereby reducing the risk of expansion and deformation of the battery module in the third direction. By positioning the second reinforcing portion on one side of the battery module in the second direction, the second reinforcing portion can directly constrain the battery module in the second direction, thereby reducing the risk of expansion and deformation of the battery module in the second direction. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a front view structural diagram of a battery pack according to some embodiments of this application after a side plate is hidden.

[0019] Figure 2 This diagram shows a top view of an example single-layer module with the battery module hidden.

[0020] Figure 3 This diagram shows a side view of an example single-layer module with the battery module hidden.

[0021] Figure 4 This diagram shows a front view of an example single-layer module with the liquid cooling components and an endplate concealed.

[0022] Figure 5 An example is shown. Figure 4 A partially enlarged schematic diagram of a single-layer module.

[0023] Figure label:

[0024] 10. Battery pack; 20. Single-layer module; 21. Shunt; 22. Current collector;

[0025] 100. Battery module; 110. First surface;

[0026] 200. End plate;

[0027] 300. First reinforcing component;

[0028] 400. Second reinforcing member; 410. First reinforcing part; 420. Second reinforcing part;

[0029] 500. Central support plate;

[0030] x, first direction; y, second direction; z, third direction. Detailed Implementation

[0031] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0032] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as a limitation of this application.

[0033] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0035] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0036] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0037] The battery pack and electrical device provided in the embodiments of this application will be described below with reference to the accompanying drawings. It should be noted that in the drawings, the x-direction is the first direction, the y-direction is the second direction, and the z-direction is the third direction. In the drawings, for ease of drawing, the dimensions are not necessarily proportional to the actual dimensions.

[0038] Please refer to Figures 1 to 3 , Figure 1 This is a front view structural diagram of a battery pack according to some embodiments of this application after a side plate is hidden. Figure 2 This diagram shows a top view of an example single-layer module with the battery module hidden. Figure 3 This diagram shows a side view of an example single-layer module with the battery module hidden.

[0039] like Figures 1 to 3 As shown, an embodiment of this application provides a battery pack 10, including at least one single-layer module 20. The single-layer module 20 includes a battery module 100, end plates 200, a first reinforcing member 300, and a second reinforcing member 400. Multiple battery modules 100 are provided, each including two first surfaces 110 disposed opposite each other along a first direction (x-direction in the figure) and two second surfaces (not shown) disposed opposite each other along a second direction (y-direction in the figure). Two end plates 200 are provided, located on opposite sides of the battery module 100 along the first direction x. The first reinforcing member 300 is located on one side of the battery module 100 along a third direction (z-direction in the figure), connecting the two end plates 200. The first direction x, the second direction y, and the third direction z intersect each other. The second reinforcing member 400 connects the two end plates 200. The second reinforcing member 400 includes a first reinforcing part 410 and a second reinforcing part 420 that are connected to each other. The first reinforcing member 400 and the first reinforcing part 410 are located on the same side of the battery module 100, and the second reinforcing part 420 is located on the side of the battery module 100 in the second direction y.

[0040] The battery module 100 is assembled from multiple battery cells (not shown). All battery modules 100 in the single-layer module 20 are stacked to form a large rectangular module. Two end plates 200 are located on both sides of the rectangular module in the first direction x. The first reinforcing member 300 and the first reinforcing part 410 are located on the same side of the rectangular module in the third direction z. The second reinforcing part 420 is located on one side of the rectangular module in the second direction y.

[0041] Optionally, the first direction x is the front-to-back direction, the second direction y is the left-to-right direction, and the third direction z is the height direction. Since the pressure relief valves of the battery module 100 are all positioned downwards, the first reinforcing member 300 and the first reinforcing part 410 are both positioned above the battery module 100 to avoid obstructing the pressure relief valves.

[0042] Optionally, there may be multiple single-layer modules 20, which are stacked along a third direction z. Each single-layer module 20 includes a first reinforcing member 300 and a second reinforcing member 400, and both the first reinforcing member 300 and the first reinforcing part 410 of the single-layer module 20 are located above the battery module 100 within that single-layer module 20. In this embodiment, two single-layer modules 20 are used, meaning the battery pack 10 in this embodiment is a double-layer module battery pack 10.

[0043] The battery pack 10 of this application embodiment improves the structural strength of the end plates 200 by providing a first reinforcing member 300 and a second reinforcing member 400 connecting the two end plates 200, thereby increasing the constraint force of the end plates 200 on the battery module 100 in the first direction x and reducing the risk of expansion deformation of the battery module 100 in the first direction x. By positioning both the first reinforcing member 300 and the first reinforcing part 410 on the side of the battery module in the third direction z, the first reinforcing member 300 and the first reinforcing part 410 can directly constrain the battery module 100 in the third direction z, thereby reducing the risk of expansion deformation of the battery module 100 in the third direction z. By positioning the second reinforcing part 420 on the side of the battery module 100 in the second direction y, the second reinforcing part 420 can directly constrain the battery module 100 in the second direction y, thereby reducing the risk of expansion deformation of the battery module 100 in the second direction y.

[0044] In some embodiments, there are two second reinforcing members 400, and the second reinforcing portions 420 of the two second reinforcing members 400 are respectively located on both sides of the battery module 100 in the second direction y. It can be understood that the two first reinforcing portions 410 and the first reinforcing members 300 in the single-layer module 20 are all located on top of the rectangular module formed by stacking the battery modules 100, and the two second reinforcing portions 420 are respectively located on the left and right sides of the rectangular module formed by stacking the battery modules 100.

[0045] Optionally, there may be multiple first reinforcing members 300, each located between two second reinforcing members 400. In this embodiment, two first reinforcing members 300 are used as an example for illustration.

[0046] Optionally, the distance between any two adjacent first reinforcing members 300 is L1 (the dimension L1 in the figure), and the distance between the second reinforcing member 400 and the adjacent first reinforcing member 300 is L2 (the dimension L1 in the figure), and L1 is equal to L2.

[0047] The battery pack 10 of this application improves the connection stability of the first reinforcing member 300 and the second reinforcing member 400 to the end plate 200 by making the spacing between each reinforcing member equal, and reduces the risk of deformation of the end plate 200 due to uneven local stress.

[0048] Of course, in other embodiments, L1 may not be equal to L2. The assembly can be adjusted according to actual needs, which will not be elaborated here.

[0049] Please refer to Figures 1 to 5 , Figure 4 This diagram shows a front view of an example single-layer module with the liquid cooling components and an endplate concealed. Figure 5 An example is shown. Figure 4 A partially enlarged schematic diagram of a single-layer module.

[0050] like Figures 1 to 5 In some embodiments, the area of ​​the first surface 110 is greater than the area of ​​the second surface.

[0051] It should be noted that the battery module 100 is a rectangular module, and the battery module 100 has three sets of surfaces arranged opposite each other along the first direction x, the second direction y, and the third direction z, respectively. The first surface 110 has the largest area and is generally defined as the large surface of the battery module 100. Since the cell pressure relief valve is designed downward in this embodiment, the bottom liquid cooling mode of the cell cannot be used. Therefore, the large surface liquid cooling method of the cell is adopted in this embodiment. This heat dissipation method greatly improves the heat dissipation efficiency and reduces the risk of cell thermal runaway. Specifically, the single-layer module 20 also includes a liquid cooling component, which includes a distributor 21 and a current collector 22 located on both sides of the battery module 100 in the second direction y, respectively. The heat dissipation medium flows into each branch channel at the distributor 21, and the branch channels flow through the first surface 110 of each battery module 100, thereby dissipating heat from each battery module 100. Then the branch flow channel will flow from the other side of the battery module 100 in the second direction y into the collector 22. After the heat dissipation medium at the collector 22 exchanges heat with the external environment, it flows into the splitter 21 and realizes the medium circulation.

[0052] Optionally, the orthographic projection area of ​​the first reinforcing part 410 in the third direction z is larger than the orthographic projection area of ​​the second reinforcing part 420 in the second direction y. This can be understood as the second reinforcing member 400 having a shape similar to angle steel, and the size of the first reinforcing part 410 being larger than the size of the second reinforcing part 420. The orthographic projection of the second reinforcing part 420 in the second direction y overlaps with the orthographic projection of at least one battery module 100 in the second direction y, but does not overlap with the orthographic projections of the splitter 21 and the current collector 22 in the second direction y.

[0053] The battery pack 10 of this application embodiment makes the orthogonal projection area of ​​the first reinforcing part 410 in the third direction z larger than the orthogonal projection area of ​​the second reinforcing part 420 in the second direction y, and makes the orthogonal projection of the second reinforcing part 420 in the second direction y not overlap with the orthogonal projections of the shunt 21 and the current collector 22 in the second direction y, so that the second reinforcing part 420 can directly constrain the battery module 100 in the second direction y while not interfering with the shunt 21 and the current collector 22, which is beneficial to the arrangement of the shunt 21 and the current collector 22.

[0054] In some embodiments, the single-layer module 20 further includes a central support plate 500 located between two end plates 200. The end plates 200 and the central support plate 500 are arranged parallel to each other along a first direction x. Battery modules 100 are provided on both sides of the central support plate 500 in the first direction x. At least one of the first reinforcing member 300 and the second reinforcing member 400 is connected to the central support plate 500.

[0055] The central support plate 500 is used to separate the battery module 100 and increase the strength of the single-layer module 20, further reducing the risk of expansion and deformation of the battery module 100.

[0056] Optionally, the first reinforcing member 300, the first reinforcing portion 410, and the second reinforcing portion 420 all extend along the first direction x. The two ends of the first reinforcing member 300 and the second reinforcing member 400 are respectively bolted to the two end plates 200.

[0057] Optionally, the middle parts of both the first reinforcing member 300 and the second reinforcing member 400 are bolted to the middle support plate 500.

[0058] The battery pack 10 of this application embodiment has its ends bolted to the two end plates 200 respectively by the first reinforcing member 300 and the second reinforcing member 400, and the middle parts of the first reinforcing member 300 and the second reinforcing member 400 are bolted to the middle support plate 500. The middle support plate 500 and the end plates 200, which are arranged parallel and spaced along the first direction x, are connected into a whole by the first reinforcing member 300 and the second reinforcing member 400, thereby improving the overall strength of the single-layer module 20 and further reducing the risk of expansion and deformation of the battery module 100.

[0059] Of course, in other embodiments, the first reinforcing member 300 and the second reinforcing member 400 may not be connected to the central support plate 500. They can be adjusted according to actual needs during assembly, which will not be elaborated here.

[0060] In some embodiments, at least a portion of the battery module 100 is bonded to the first reinforcement 300 and / or the second reinforcement 400.

[0061] In this embodiment, at least a portion of the battery module 100 abuts against the first reinforcing member 300 and the first reinforcing part 410. The first reinforcing member 300, the first reinforcing part 410, and the battery module 100 abutting against them are connected by structural adhesive.

[0062] Optionally, the second reinforcing part 420 is bonded to the side of the upper shoulder of at least one battery module 100.

[0063] The battery pack 10 of this application embodiment reduces the risk of expansion and deformation of the battery module 100 in the third direction z by bonding at least a portion of the battery module 100 to the first reinforcing member 300 and / or the second reinforcing member 400, and by using the first reinforcing member 300 and the second reinforcing member 400 to directly constrain the battery module in the third direction z.

[0064] The second aspect of this application also provides an electrical device, including a battery pack 10 as described in any of the first aspects of the above embodiments. The electrical device can be an electric toy, power tool, electric vehicle, electric car, or spacecraft, etc. When the electrical device is a spacecraft, the battery pack 10 can be an aviation-grade battery. When the electrical device is a vehicle, the vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The battery pack 10 is installed inside the vehicle and can be located at the bottom, front, or rear of the vehicle. The battery pack 10 can be used to power the vehicle; for example, the battery pack 10 can serve as the vehicle's operating power source. The vehicle may also include a controller and a motor. The controller controls the battery pack 10 to supply power to the motor, for example, to meet the power needs of the vehicle during starting, navigation, and driving.

[0065] Since the electrical equipment provided in the second aspect embodiment of this application includes the battery pack 10 in the first aspect embodiment, it has all the technical effects of the above embodiments, which will not be repeated here.

[0066] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0067] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A battery pack, characterized in that, It includes at least one single-layer module, the single-layer module comprising: A battery module, comprising multiple battery modules, wherein the battery module includes two first surfaces disposed opposite to each other along a first direction and two second surfaces disposed opposite to each other along a second direction; There are two end plates, which are located on opposite sides of the battery module in the first direction. The first reinforcing member is located on the third-direction side of the battery module. The first reinforcing member connects the two end plates, and the first direction, the second direction, and the third direction are arranged to intersect each other. The second reinforcing member connects the two end plates. The second reinforcing member includes a first reinforcing part and a second reinforcing part that are connected to each other. The first reinforcing member and the first reinforcing part are located on the same side of the battery module, and the second reinforcing part is located on one side of the battery module in the second direction.

2. The battery pack as described in claim 1, characterized in that, The number of the second reinforcing members is two, and the second reinforcing parts of the two second reinforcing members are respectively located on both sides of the battery module in the second direction.

3. The battery pack as described in claim 2, characterized in that, There are multiple first reinforcing members, and each of the multiple first reinforcing members is located between two second reinforcing members.

4. The battery pack as described in claim 3, characterized in that, The distance between any two adjacent first reinforcing members is L1, and the distance between the second reinforcing member and the adjacent first reinforcing member is L2, and L1 equals L2.

5. The battery pack as described in claim 1, characterized in that, The single-layer module also includes: A central support plate is located between the two end plates. The end plates and the central support plate are arranged parallel to each other along the first direction. The battery modules are provided on both sides of the central support plate in the first direction. At least one of the first reinforcing member and the second reinforcing member is connected to the central support plate.

6. The battery pack as described in claim 1, characterized in that, At least a portion of the battery module is bonded to the first reinforcement and / or the second reinforcement.

7. The battery pack as described in claim 1, characterized in that, The area of ​​the first surface is greater than the area of ​​the second surface.

8. The battery pack as claimed in claim 1, characterized in that, The first reinforcing member, the first reinforcing portion, and the second reinforcing portion all extend along the first direction.

9. The battery pack as claimed in claim 1, characterized in that, The number of single-layer modules is multiple, and the multiple single-layer modules are stacked along the third direction.

10. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1 to 9.

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