End plate assembly for cylindrical battery pack, battery pack and vehicle

Abstract

The utility model relates to the technical field of power batteries, in particular to an end plate assembly for a cylindrical battery pack, a battery pack and a vehicle, the end plate assembly is arranged on the same side of the cylindrical battery pack, and the end plate assembly comprises a plurality of side end plates matched with the shapes of the side surfaces of single cylindrical batteries. Therefore, a plurality of small modularized side end plates are adopted for battery protection and battery pack fixation, and the space utilization rate of the whole cylindrical battery pack can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly provides an end plate assembly for a cylindrical battery pack, a battery pack and a vehicle. Background Art

[0002] At present, with the rapid development of the new energy industry, new energy devices such as electric vehicles and electric aircraft have been widely used, and the battery pack, as the core part of the new energy device, has also been widely concerned. Currently, the mainstream battery packs generally contain square shell battery monomers, cylindrical battery monomers or soft package battery monomers.

[0003] In the prior art, for the design of a cylindrical battery pack composed of multiple cylindrical battery monomers, generally large end plates are arranged at the four ends of the cylindrical battery pack to protect several monomers at the ends, forming a cylindrical battery module. However, due to the irregular shape of the ends of the cylindrical battery monomers, the overall space utilization rate of the cylindrical battery pack is not high.

[0004] Therefore, a new end plate design is needed in this field to solve the above problems. Summary of the Utility Model

[0005] The utility model aims to solve the technical problem of low overall space utilization rate of the cylindrical battery pack.

[0006] In a first aspect, the utility model provides an end plate assembly for a cylindrical battery pack. The end plate assembly is arranged on the same side of the cylindrical battery pack, and the end plate assembly includes a plurality of side end plates that match the side shape of the cylindrical battery monomers.

[0007] Optionally, the side end plate further includes a fixing part for fixedly connecting with the battery pack box body.

[0008] Optionally, the fixing part is located inside the side end plate.

[0009] Optionally, the fixing part includes a fixing hole, and reinforcing ribs are arranged around the fixing hole.

[0010] Optionally, the inside of the side end plate includes a cavity for filling glue.

[0011] In a second aspect, the utility model further provides a battery pack, which includes the end plate assembly described in any one of the above, and a plurality of cylindrical battery monomers are arranged inside the battery pack.

[0012] Optionally, the battery pack includes a box body, the side end plate includes a fixing part, and the fixing part is fixedly connected with the box body.

[0013] Optionally, the fixing part includes a fixing hole, and reinforcing ribs are arranged around the fixing hole; the box body includes a fixing rod, and the fixing rod is arranged in the fixing hole to realize the fixed connection between the fixing part and the box body.

[0014] Optionally, the battery pack further includes a cooling plate, and two cooling plates are connected to form a connecting part. The first surface of the connecting part of the two cooling plates is close to the box body, and the second surface of the connecting part is close to the side end plate.

[0015] In a third aspect, the present invention further provides a vehicle, and the vehicle includes the battery pack described in any one of the above.

[0016] In the case of adopting the above technical solutions, the end plate assembly provided by the present invention includes a plurality of independent side end plates. On the basis of achieving the anti-impact effect of the traditional end plate, it can better fit the shape of the side of the cylindrical battery cell, and is more closely combined with the cylindrical battery pack, so as to make full use of the irregular layout space of the cylindrical battery pack and improve the space utilization rate of the entire battery pack. In addition, the design of the independent side end plate can be flexibly arranged, miniaturize the cylindrical battery pack, improve the volume grouping rate and weight grouping rate of the cylindrical battery pack, and more cylindrical battery cells can be arranged in the battery pack of the same volume, or a larger side impact safety space of the battery pack can be reserved.

[0017] In addition, on the basis of the above technical solutions, the present invention further improves. The side end plate may further include a fixing part for fixedly connecting with the battery pack box body. Thus, the position of the cylindrical battery pack in the battery pack can be limited by the side end plate, and the battery pack can be prevented from shifting due to impacts or other reasons.

[0018] Further, the fixing part is located inside the side end plate. Thus, when the side end plate is fixed to the battery pack box body, the force can be transmitted through the fixing part inside the side end plate, and the mechanical properties are better. Further, the fixing part is located at the mechanical center of the side end plate, thereby further improving its mechanical properties.

[0019] Further, the side end plate is arranged between the cooling plate and the cylindrical battery cell, and such a sandwich structure improves the local stiffness of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The following describes the preferred embodiments of the present invention with reference to the drawings, in which:

[0021] Figure 1 is the top view of the first cylindrical battery pack provided by the present invention;

[0022] Figure 2 is the top view of the second cylindrical battery pack provided by the present invention;

[0023] Figure 3This is the side view of the second cylindrical battery pack provided by the present utility model.

[0024] List of reference numerals:

[0025] 1. End plate assembly; 11. Side end plate; 110. Fixing hole of side end plate; 111. Reinforcing rib of side end plate; 112. Cavity of side end plate; 2. Cylindrical battery cell; 3. Cooling plate; 31. Connecting part of cooling plate; 311. First surface of connecting part; 312. Second surface of connecting part; 4. Side plate. Detailed implementation manners

[0026] The following describes the preferred implementation manners of the present utility model with reference to the accompanying drawings. Those skilled in the art should understand that these implementation manners are only used to explain the technical principle of the present utility model and are not intended to limit the protection scope of the present utility model.

[0027] It should be noted that in the description of the present utility model, the terms indicating directions or positional relationships such as "inner", "outer", "upper", "lower", "top", "bottom", etc. are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0028] In addition, it should also be noted that in the description of the present utility model, unless otherwise clearly specified and limited, the terms "set", "connected", "installed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0029] The following combines Figures 1 to 3 to illustrate the end plate assembly, battery pack and vehicle for a cylindrical battery pack provided by the present utility model. Figure 1 This is the top view of the first cylindrical battery pack provided by the present utility model. Figure 2 This is the top view of the second cylindrical battery pack provided by the present utility model. Figure 3 This is the side view of the second cylindrical battery pack provided by the present utility model.

[0030] In the first aspect, the present utility model provides an end plate assembly 1 for a cylindrical battery pack. The end plate assembly 1 is arranged on the same side of the cylindrical battery pack. The end plate assembly 1 includes a plurality of side end plates 11 that match the side shape of the cylindrical battery cells 2, and each side end plate 11 is independent of each other. Optionally, the shapes of the side end plates 11 in the end plate assembly 1 can be the same or different.

[0031] As shown Figure 1 in the figure, five side end plates 11 are provided on one side of the cylindrical battery pack, and the shape of the side of each side end plate 11 close to the cylindrical battery cell 2 matches the shape of the side of the cylindrical battery cell 2. Figure 1 Among the five side end plates 11 in [[reference]], the shapes of the middle three side end plates 11 are the same and are in contact with the sides of two cylindrical battery cells 2. That is, each of these three side end plates 11 includes two arc-shaped sides, and these two sides match the shape of the side of the cylindrical battery cell 2. The shapes of the two side end plates 11 located at the edge of the cylindrical battery pack are different from those of the other side end plates 11, and each of these two side end plates 11 includes one arc-shaped side, and this one side matches the shape of the side of the cylindrical battery cell 2.

[0032] It should be noted that, in addition to the above limitations, the sides of each side end plate 11 can also be set with different shapes according to the arrangement requirements of other components in the cylindrical battery pack, which will not be elaborated herein.

[0033] The utility model adopts a number of small modular side end plates for battery protection and battery pack fixation. The independent multiple side end plates 11, on the basis of achieving the anti-impact effect of the traditional end plate, can better match the shape of the side of the cylindrical battery cell 2 and be more closely combined with the cylindrical battery pack, so as to make full use of the irregular layout space of the cylindrical battery pack and improve the space utilization rate of the whole battery pack. In addition, the design of the independent side end plate 11 can be flexibly arranged to miniaturize the cylindrical battery pack, improve the volume grouping rate and weight grouping rate of the cylindrical battery pack, and more cylindrical battery cells can be arranged in the same volume of battery pack, or a larger side collision safety space for the battery pack can be reserved.

[0034] In one embodiment, the side end plate 11 may further include a fixing portion for fixedly connecting with the battery pack box body. Thus, the position of the cylindrical battery pack in the battery pack can be limited by the side end plate to prevent the battery pack from shifting due to impacts or other reasons.

[0035] Optionally, each side end plate 11 may include one or more fixing portions. Among the multiple side end plates 11 included in the end plate assembly 1, the number of fixing portions included in each side end plate 11 may be the same, such as each side end plate 11 includes one fixing portion; the number of fixing portions included in each side end plate 11 may also be different, such as one side end plate 11 includes one fixing portion and another side end plate includes three fixing portions. The number of fixing portions included in each side end plate 11 may be set according to at least one of the following features: the shape or size of this side end plate 11; the position of this side end plate 11 in the battery pack; the connection requirement between this side end plate 11 and the battery pack box body.

[0036] Figures 1 to 3 The cylindrical battery pack shown is disposed within the battery pack housing, and the end plate 11 is fixedly connected to the battery pack housing through the fixing portion. In a specific embodiment, the battery pack housing includes a lid, a lower housing, and a bottom plate. The lower housing includes a plurality of side walls connected end to end, and the lid and the bottom plate respectively cover two sides of the lower housing. Thus, a sealed cavity is formed within the battery box for placing Figures 1 to 3 the cylindrical battery pack shown.

[0037] In a specific embodiment, the fixing portion of the side end plate 11 is connected to the lower housing, that is, the side end plate 11 is fixed to the lower housing of the battery pack. In another specific embodiment, the fixing portion of the side end plate 11 is connected to the bottom plate, that is, the side end plate 11 is fixed to the bottom plate. In still another specific embodiment, the fixing portions of several side end plates 11 in the end plate assembly 1 are connected to the lower housing, and the fixing portions of several other side end plates 11 in the end plate assembly 1 are connected to the bottom plate.

[0038] Optionally, the side end plate 11 and the battery pack housing can be connected by at least one of the following connection methods: threaded connection, flange connection, welding, groove connection (clamp connection), ferrule connection, compression connection, and adhesive bonding. Correspondingly, the fixing portion can include any structure for implementing the above connection methods. For example, if the side end plate 11 and the battery pack housing are connected by a threaded connection, the fixing portion of the side end plate 11 can include screws or bolts for implementing the threaded connection, and the battery pack housing includes corresponding threaded holes; or the fixing portion of the side end plate 11 can include threaded holes for implementing the threaded connection, and the battery pack housing includes corresponding screws or bolts.

[0039] In a specific embodiment, the fixing portion can include a fixing hole 110, and the housing includes a fixing rod. The fixing rod is disposed in the fixing hole 110 to achieve the fixed connection between the fixing portion and the housing.

[0040] In a specific embodiment, the fixing rod is a screw or a bolt, and threads are provided on the outer periphery of the screw or the bolt; threads are also provided on the inner wall of the fixing hole 110. The screw or the bolt is fixed in the fixing hole 110 through the threads to achieve the fixation of the side end plate 11 and the battery pack housing.

[0041] Optionally, reinforcing ribs 111 are provided around the fixing hole 110. The reinforcing ribs 111 extend from the outer wall of the fixing hole 110 to the side wall of the side end plate 11. Optionally, each side end plate 11 includes a plurality of reinforcing ribs 111. Since the fixing hole 110 is the fixing location between the side end plate 11 and the battery pack housing and is a stress concentration point, the reinforcing ribs 111 can avoid direct force transmission between the fixing portion and the side wall of the side end plate 11 and improve the mechanical properties. In addition, the reinforcing ribs 111 can also improve the strength of the side end plate 11.

[0042] Further, the reinforcing rib 111 can be set as an arc shape, and the arc-shaped reinforcing rib 111 can better resist deformation.

[0043] It should be noted that the connection manner of the side end plate 11 and the battery pack box body, and the fixing part of the side end plate 11 include but are not limited to the above examples, which will not be elaborated here.

[0044] In one embodiment, the fixing part is located inside the side end plate 11, as shown in Figures 1 to Figure 3 As shown, in this way, it can be ensured that when the side end plate 11 is fixed to the battery pack box body, the force is transmitted through the fixing part inside the side end plate, and the mechanical properties are better. Optionally, as shown in the figure, the inside of the side end plate 11 is hollowed out, and the fixing part is arranged inside the side end plate 11. Further, the fixing part is located at the mechanical center of the side end plate 11, thereby further improving its mechanical properties.

[0045] It should be noted that the fixing part can also be located at the end of the side end plate 11 or other positions, which will not be elaborated here.

[0046] Optionally, the inside of the side end plate 11 includes a cavity 112, and the cavity 112 is used for filling glue. Among them, the filling glue can be foaming glue, and the density of the foaming glue is less than that of the side end plate 11. Thus, the weight of the cylindrical battery pack can be effectively reduced, and then the weight of the battery pack can be reduced, realizing the lightweight of the battery pack.

[0047] In the second aspect, the present invention also provides a battery pack, and the battery pack includes the end plate assembly 1 described in any one of the above. A plurality of cylindrical battery monomers 2 are arranged inside the battery pack. Optionally, each side end plate 11 is arranged on the side of the cylindrical battery pack and can be attached to the side of the cylindrical battery monomer 2.

[0048] Optionally, the battery pack includes a box body, and each side end plate includes a fixing part, and the fixing part is fixedly connected to the box body.

[0049] For the description of the battery pack and the box body (or the battery pack box body), reference can be made to the above description, which will not be elaborated here.

[0050] In one embodiment, the battery pack can further include a cooling plate 3. The cooling plate 3 can be arranged between two rows of cylindrical battery monomers 2, and the side of the cooling plate 3 is attached to the arc-shaped side of the cylindrical battery monomer 2. The inside of the cooling plate 3 includes a flow channel for the coolant to pass through. By heating or cooling the coolant, heating or cooling of the cylindrical battery monomer 2 can be achieved. Optionally, a cooling plate 3 can be arranged between every two rows of cylindrical battery monomers 2, or as shown in the figure, a cooling plate 3 is arranged between every two rows of cylindrical battery monomers 2 at intervals.

[0051] Optionally, the cooling plate 3 can be Figure 1 as shown in the single plate structure, or can beFigure 2 or Figure 3 The series structure shown, that is, two adjacent cooling plates 3 are connected in series through a connecting portion 31, and their internal flow channels are also connected in series.

[0052] Those skilled in the art can understand that in the existing battery pack design, the cooling plate and the cylindrical battery cells are usually protected inside the end plate to form a cylindrical battery pack, and the cylindrical batteries are fixed on the bottom plate of the battery pack. However, this type of end plate design will occupy more space and affect the volume utilization rate and power of the whole pack. To solve the above problems, the present invention provides a small modular end plate, which is arranged between the cooling pipe and the single cell for protecting the cylindrical battery cells and fixing the cylindrical battery pack, making full use of the irregular layout space of the cylindrical battery pack and improving the space utilization rate of the whole pack.

[0053] In one embodiment, please refer to Figure 2 and Figure 3 , two cooling plates 3 can be connected through a connecting portion 31. The cooling plate 2 contacts the cylindrical battery cell 2. The first surface 311 of the connecting portion 31 is close to the box body, and the second surface 312 of the connecting portion 31 is close to the side end plate 11. Thus, the side end plate 11 is arranged between the cooling plate 2 and the cylindrical battery cell 2, and such a sandwich structure improves the local stiffness of the battery pack.

[0054] Optionally, the second surface 312 of the connecting portion 31 is adhesively connected to at least one side end plate 11, and the adhesive can refer to double-sided adhesive, structural adhesive, etc.

[0055] Optionally, the gaps between the cooling plate 3, the side end plate 11 and the cylindrical battery cell 2 are filled with foaming glue to form an integral body to improve the structural stiffness of the cylindrical battery pack.

[0056] In a specific embodiment, the cylindrical battery pack includes four end faces, two of the opposite end faces are provided with side plates 4, and the other two opposite end faces are provided with a plurality of side end plates 11. Figures 1 to 3 Only one end face provided with the side end plate 11 is shown.

[0057] In another specific embodiment, a plurality of side end plates 11 are provided on all four end faces of the cylindrical battery pack.

[0058] It should be noted that the adjustment and change of the specific structural forms of the cooling plate 2 and the connecting portion 31 do not deviate from the principle and scope of the present utility model, and should be limited within the protection scope of the present utility model.

[0059] In a third aspect, the present utility model further provides a vehicle, and the vehicle of the present utility model includes any one of the battery packs introduced above.

[0060] Those skilled in the art can understand that although some embodiments herein include certain features included in other embodiments rather than other features, the combination of features of different embodiments means that it is within the scope of this application and forms different embodiments. For example, in the claims of this application, any one of the claimed embodiments can be used in any combination.

[0061] So far, the technical solution of the present utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present utility model is obviously not limited to these specific embodiments. Without departing from the principle of the present utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present utility model.

Claims

1. An end plate assembly for a cylindrical battery pack, characterized in that: The end plate assembly is arranged on the same side of the cylindrical battery pack, and the end plate assembly includes a plurality of side end plates matching the side shapes of the cylindrical battery cells.

2. The end plate assembly according to claim 1, characterized in that: The side end plate also includes a fixing portion, which is used to be fixedly connected to the battery pack box.

3. The end plate assembly according to claim 2, characterized in that: The fixing portion is located inside the side end plate.

4. The end plate assembly according to claim 2 or 3, characterized in that: The fixing portion comprises a fixing hole, and reinforcing ribs are arranged around the fixing hole.

5. The end plate assembly according to claim 1, characterized in that: The side end plate comprises a cavity inside, and the cavity is used for filling with glue.

6. A battery pack, characterized in that: The battery pack comprises the end plate assembly according to any one of claims 1 to 5, and a plurality of cylindrical battery cells are arranged in the battery pack.

7. The battery pack according to claim 6, characterized in that: The battery pack includes a box body, and the side end plate includes a fixing portion, and the fixing portion is fixedly connected to the box body.

8. The battery pack according to claim 7, characterized in that: The fixing part comprises a fixing hole, and a reinforcing rib is arranged around the fixing hole; the box body comprises a fixing rod, and the fixing rod is arranged in the fixing hole for fixing the fixing part and the box body.

9. The battery pack according to any one of claims 6 to 8, characterized in that: The battery pack further includes a cooling plate, wherein two cooling plates are connected to form a connecting portion, wherein a first surface of the connecting portion of the two cooling plates is close to the box body, and a second surface of the connecting portion is close to the side end plate.

10. A vehicle, characterized in that: The vehicle comprises a battery pack as claimed in any one of claims 6 to 9.

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