Cross beam and battery pack

Abstract

The utility model relates to the field of new energy automobiles, in particular to a cross beam and a battery pack. The cross beam comprises a cross beam body, the cross beam body is provided with a first binding face used for being attached to a battery cell, and a first groove is formed in the first binding face so that the binding area of the first binding face and the battery cell can be reduced. According to the cross beam, by reducing the attaching area of the cross beam and the battery cells, the temperature difference of the battery cells at different positions in the battery cells is prevented from being too large, the temperature balance of the battery cells at different positions in the battery pack is guaranteed, and meanwhile the friction force between the battery cells and the cross beam is reduced.

Description

Technical Field

[0001] The utility model relates to the field of new energy vehicles, and in particular to a crossbeam and a battery pack. Background Art

[0002] In the power battery industry, the battery pack of new energy vehicles is a complex integrated system, which is usually composed of multiple battery cells, beams, end plates, bottom plates and a series of insulation protection systems. However, the battery pack in the prior art has the problem of large temperature differences between the battery cells in different positions. Utility Model Content

[0003] The purpose of the utility model is to provide a crossbeam and a battery pack, which can avoid excessive temperature differences between cells at different positions in the battery cells by reducing the contact area between the crossbeam and the battery cells.

[0004] The embodiment of the utility model is achieved as follows:

[0005] In a first aspect, the utility model provides a crossbeam, comprising:

[0006] The crossbeam body has a first bonding surface for bonding with the battery cell, and the first bonding surface is provided with a first groove to reduce the bonding area between the first bonding surface and the battery cell.

[0007] In an optional embodiment, the crossbeam includes a plurality of connection portions, each connection portion has a fitting area for fitting with a battery cell, and each fitting area is provided with one or more first grooves.

[0008] In an optional embodiment, each fitting area is provided with a plurality of first grooves, and the plurality of first grooves are arranged in a circumferential array around a center line of the connecting portion.

[0009] In an optional embodiment, the first groove is a triangular groove.

[0010] In an optional embodiment, a portion of the connecting portion is provided with a through hole, and the axis of the through hole is perpendicular to the center line of the connecting portion.

[0011] In an optional embodiment, a notch is provided at the connection between two adjacent connecting portions, and the opening direction of the notch is perpendicular to the recessed direction of the first groove.

[0012] In an optional embodiment, avoidance grooves are provided at both ends of the crossbeam for accommodating liquid cooling pipes.

[0013] In a second aspect, the utility model provides a battery pack, which includes a bottom plate and the aforementioned cross beam, wherein the bottom plate is used to be connected to the battery cell, and the cross beam is connected to the bottom plate.

[0014] In an optional embodiment, the battery pack further includes two end plates, which are connected to the bottom plate, the two end plates are parallel to the cross beam and are spaced apart, and the cross beam is located between the two end plates.

[0015] In an optional embodiment, the end plate has a second fitting surface for fitting with the battery cell, the second fitting surface is arranged opposite to the first fitting surface, and the second fitting surface is provided with a second groove corresponding to the first groove.

[0016] The beneficial effects of the embodiments of the utility model include:

[0017] The crossbeam comprises a crossbeam body, the crossbeam body is provided with a first bonding surface for bonding with the battery cell, and a first groove is provided on the first bonding surface to reduce the bonding area between the first bonding surface and the battery cell.

[0018] The crossbeam is provided with a first groove on the fitting surface with the battery cell, so that the fitting area between the crossbeam and the battery cell is reduced, thereby reducing the heat transferred from the battery cell to the crossbeam, thereby reducing the temperature difference between the battery cells located at different positions in the battery pack, ensuring the temperature balance of the battery cells at different positions in the battery pack, and at the same time reducing the friction between the battery cell and the crossbeam; and the crossbeam is also provided with the first groove to reduce its weight, thereby achieving a lightweight setting.

[0019] The battery pack comprises a bottom plate and the above-mentioned cross beam, wherein the bottom plate is used to connect with the battery cell, and the cross beam is connected with the bottom plate. The battery pack has all the beneficial effects of the cross beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the structure of a battery pack provided by an embodiment of the utility model;

[0022] Figure 2 A schematic diagram of the structure of the beam provided by an embodiment of the utility model from a first viewing angle;

[0023] Figure 3 This is a schematic structural diagram of a beam provided by an embodiment of the utility model from a second viewing angle.

[0024] Icons: 100-crossbeam; 110-first fitting surface; 111-first groove; 112-longitudinal first groove; 113-transverse first groove; 120-connecting portion; 121-through hole; 130-avoidance groove; 200-bottom plate; 300-end plate; 310-second fitting surface; 311-second groove; 400-battery pack. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0028] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0029] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only 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.

[0030] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] The battery pack in the prior art is generally provided with a cross beam to squeeze the battery cells. However, since the cross beam is in contact with some of the battery cells, the battery cells in contact with the cross beam can transfer heat to the cross beam, so that the temperature of the battery cells in contact with the cross beam is lower than that of other battery cells, resulting in excessive temperature difference between battery cells at different positions in the battery pack, which is not conducive to the battery life of the battery pack.

[0032] like Figure 1 As shown, Figure 1 A schematic diagram of the structure of a battery pack 400 provided in an embodiment of the utility model. Based on this, the utility model provides a battery pack 400, which includes a bottom plate 200, a crossbeam 100 and a plurality of battery cells (not shown), wherein the crossbeam 100 is connected to the bottom plate 200 and is bonded to some of the battery cells. The battery pack 400 reduces the bonding area between the crossbeam 100 and the battery cells, thereby reducing the heat transferred from the battery cells to the crossbeam 100, thereby ensuring the temperature balance between the battery cells at different positions in the battery pack 400.

[0033] The crossbeam 100 will be described in detail below:

[0034] like Figure 2 and Figure 3 As shown, Figure 2 A schematic structural diagram of a beam 100 provided in an embodiment of the utility model at a first viewing angle; Figure 3 The crossbeam 100 provided by the present invention is a schematic diagram of the structure in the second viewing angle. The crossbeam 100 includes a crossbeam body, which has a first bonding surface 110 for bonding with a battery cell, and a first groove 111 is provided on the first bonding surface 110 to reduce the bonding area between the first bonding surface 110 and the battery cell.

[0035] Specifically, in this embodiment, the crossbeam 100 is located between the two sides of the bottom plate 200, so that the crossbeam 100 has two opposite first bonding surfaces 110 that are bonded to the battery cells, and the two first bonding surfaces 110 are both provided with first grooves 111 to reduce the bonding area between the crossbeam 100 and the battery cells. It should be noted that, in this embodiment, the first grooves 111 are recessed in a direction perpendicular to the first bonding surfaces 110.

[0036] The working principle of the crossbeam 100 in the battery pack 400 is as follows:

[0037] The battery pack 400 distributes the cells in two areas by providing a crossbeam 100, and the crossbeam 100 has two first bonding surfaces 110 that are bonded to the cells. The crossbeam 100 reduces the bonding area between the first bonding surface 110 and the cells by providing a first groove 111 in a direction perpendicular to the first bonding surface 110 on each first bonding surface 110, thereby reducing the heat transferred from the cells to the crossbeam 100, so as to ensure that the temperature of the cells bonded to the crossbeam 100 is consistent with the temperature of other cells, thereby achieving temperature balance between cells at different positions of the battery pack 400.

[0038] Furthermore, the crossbeam 100 includes a plurality of connection portions 120 , each connection portion 120 has a bonding area for bonding with a battery cell, and each bonding area is provided with one or more first grooves 111 .

[0039] Specifically, in this embodiment, each first bonding surface 110 is bonded to a plurality of battery cells. Therefore, in order to ensure that the temperature of each battery cell bonded to the first bonding surface 110 is consistent, the crossbeam 100 is provided with a plurality of connecting portions 120, each connecting portion 120 having a bonding area for bonding to a battery cell. By providing a first groove 111 on the bonding area, the heat transferred to the crossbeam 100 by each battery cell bonded to the first bonding surface 110 is reduced, so that the temperature of the battery cells at different positions is consistent, so as to ensure the temperature balance between the battery cells at different positions. It should be noted that, in this embodiment, the crossbeam 100 has two first bonding surfaces 110, so each connecting portion 120 has two bonding areas.

[0040] According to the above configuration, each fitting area is provided with a plurality of first grooves 111 , and the plurality of first grooves 111 are arranged in a circumferential array around the center line of the connecting portion 120 .

[0041] Specifically, in this embodiment, each bonding area is provided with four first grooves 111, and the four first grooves 111 are divided into two longitudinal first grooves 112 and two transverse first grooves 113. It should be noted that, in this embodiment, the shape of the bonding area is rectangular, wherein the specific shapes of the longitudinal first grooves 112 and the transverse first grooves 113 vary according to the different length-to-width ratios of the connecting portion 120.

[0042] Furthermore, in this embodiment, in order to increase the projection area of ​​the first groove 111 in the direction in which it is opened, so as to reduce the contact area between the first bonding and the battery cell, the first groove 111 is a triangular groove. In other embodiments, the first groove 111 can also be a groove of other shapes, which is not limited by the present invention.

[0043] Furthermore, a part of the connecting portion 120 is provided with a through hole 121, and the axis of the through hole 121 is perpendicular to the center line of the connecting portion 120. Specifically, the battery pack 400 further includes a plurality of connecting members, each of which is passed through a through hole 121, so that the crossbeam 100 is connected to the bottom plate 200 to complete the installation of the battery pack 400. In this embodiment, the through hole 121 is a threaded hole, and the connecting member is a bolt.

[0044] A connection portion 120 is disposed between every two adjacent connection portions 120 provided with through holes, so that the plurality of through holes 121 are symmetrically arranged with respect to the center line of the crossbeam 100 , thereby making the connection of the crossbeam 100 more stable.

[0045] According to the above configuration, the battery pack 400 also includes a liquid cooling pipe, which is disposed at both ends of the crossbeam 100 . In order to accommodate the liquid cooling pipe, avoidance grooves 130 are disposed at both ends of the crossbeam 100 , that is, the liquid cooling pipe is accommodated in the avoidance grooves 130 .

[0046] Furthermore, the battery pack 400 further includes two end plates 300, the end plates 300 are connected to the bottom plate 200, the two end plates 300 are parallel to and spaced apart from the crossbeam 100, and the crossbeam 100 is located between the two end plates 300. The end plate 300 has a second bonding surface 310 for bonding with the battery cell, the second bonding surface 310 is arranged opposite to the first bonding surface 110, and the second bonding surface 310 is provided with a second groove 311 corresponding to the first groove 111.

[0047] Specifically, in this embodiment, two end plates 300 are distributed on both sides of the bottom plate 200, and the crossbeam 100 is arranged at the center of the bottom plate 200, wherein the battery cell is located between the crossbeam 100 and one of the end plates 300, so that the crossbeam 100 has two opposite first bonding surfaces 110 bonded to the battery cell, and each end plate 300 has a second bonding surface 310 bonded to the battery cell. In order to avoid the temperature of the battery cell bonded to the second bonding surface 310 being inconsistent with the temperature of other battery cells, that is, the temperature difference between different battery cells in the battery pack 400 is too large, a second groove 311 is opened on the second bonding surface 310 to reduce the bonding area between the second bonding surface 310 and the battery cell. It should be noted that in order to make the temperature of the battery cells at different positions consistent, the number, position and shape of the second grooves 311 correspond to the first grooves 111.

[0048] In summary, the crossbeam 100 includes a crossbeam 100 body, and the crossbeam 100 body has a first bonding surface 110 for bonding with the battery cell, and a first groove 111 is provided on the first bonding surface 110 to reduce the bonding area between the first bonding surface 110 and the battery cell. The crossbeam 100 reduces the bonding area between the crossbeam 100 and the battery cell by providing the first groove 111 on the bonding surface with the battery cell, thereby reducing the heat transferred from the battery cell to the crossbeam 100, thereby reducing the temperature difference between the battery cells at different positions in the battery pack 400, ensuring the temperature balance of the battery cells at different positions in the battery pack 400, and reducing the friction between the battery cell and the crossbeam 100; and the crossbeam 100 also reduces its weight by providing the first groove 111, thereby achieving a lightweight setting.

[0049] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A beam, characterized in that: include: A crossbeam body is provided, wherein the crossbeam body is provided with a first bonding surface (110) for bonding with a battery cell, wherein the first bonding surface (110) is provided with a first groove (111) to reduce a bonding area between the first bonding surface (110) and the battery cell.

2. The crossbeam according to claim 1, characterized in that: The crossbeam (100) comprises a plurality of connection parts (120), each connection part (120) is provided with a bonding area for bonding with a battery cell, and each of the bonding areas is provided with one or more of the first grooves (111).

3. The crossbeam according to claim 2, characterized in that: Each of the fitting areas is provided with a plurality of first grooves (111), and the plurality of first grooves (111) are arranged in a circumferential array around the center line of the connecting portion (120).

4. The crossbeam according to claim 3, characterized in that: The first groove (111) is a triangular groove.

5. The crossbeam according to claim 2, characterized in that: A portion of the connecting portion (120) is provided with a through hole (121), and the axis of the through hole (121) is perpendicular to the center line of the connecting portion (120).

6. The crossbeam according to claim 2, characterized in that: A notch is provided at the connection point of two adjacent connection parts (120), and the opening direction of the notch is perpendicular to the recessed direction of the first groove (111).

7. The crossbeam according to claim 1, characterized in that: Both ends of the crossbeam (100) are provided with avoidance grooves (130) for accommodating liquid cooling pipes.

8. A battery pack, characterized in that: The battery pack (400) comprises a base plate (200) and a crossbeam (100) as described in any one of claims 1 to 7, wherein the base plate (200) is used to be connected to the battery cell, and the crossbeam (100) is connected to the base plate (200).

9. The battery pack according to claim 8, characterized in that: The battery pack (400) further comprises two end plates (300), wherein the end plates (300) are connected to the bottom plate (200), the two end plates (300) are parallel to the crossbeam (100) and are arranged at intervals, and the crossbeam (100) is located between the two end plates (300).

10. The battery pack according to claim 9, characterized in that: The end plate (300) has a second bonding surface (310) for bonding with the battery cell, the second bonding surface (310) is arranged opposite to the first bonding surface (110), and the second bonding surface (310) is provided with a second groove (311) corresponding to the first groove (111).

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