Battery tray, battery pack, and electrical facility

Abstract

To provide a battery tray, a battery pack, and an electrical facility for regulating a position of a battery cell group having a different length and avoiding occurrence of a short circuit of the battery pack.SOLUTION: A battery tray comprises: a bottom plate; and at least two expansion beams 2 extending along a first direction. The bottom plate is provided with at least two expansion beams spaced apart along a second direction, and the first direction and the second direction are perpendicular. One of the inflation beams includes at least a first inflation part 21 in which a first attachment region 11 is formed between the inflation beam and another inflation beam, and a second inflation part 22 in which a second attachment region 12 is formed between the inflation beam and another inflation beam. Since the width of the first inflation part and the second inflation part in the second direction are not equal to each other, the length of the first attachment region and the second attachment region in the second direction are not equal to each other.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to the technical field of batteries, and in particular to battery trays, battery packs and electrical equipment. [Background technology]

[0002] In the battery pack, expansion beams are attached to the bottom plate of the battery tray to position the battery cell groups, and the battery cell groups are attached to the bottom plate at intervals along the width direction of the bottom plate, and the battery cells in each battery cell group are bonded to the bottom plate with a structural adhesive. The expansion beams abut against the side surfaces of the battery cells in each battery cell group to resist expansion deformation of the battery cells.

[0003] Conventional battery trays are custom designed based on the number of battery cells, and the expansion beams are regular aluminum profile beams. If the number of battery cells in a battery cell group varies, the battery cell group cannot contact the expansion beam, so the size of the expansion beam cannot be adaptively adjusted based on the actual number of battery cells, resulting in poor versatility of the battery tray. When the battery cells expand and deform, the bottom of the battery cell is glued to the bottom plate to prevent movement, while the top of the battery cell is subjected to a small restraining force. This causes the solder to loosen in the connecting aluminum busbar between the battery cells, posing a risk of short circuiting the battery pack. Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention aims to provide a battery tray, a battery pack, and electrical equipment that can regulate the position of groups of battery cells of different lengths, improve the versatility of the battery tray, and prevent short circuits from occurring in the battery pack. [Means for solving the problem]

[0005] To achieve this object, the technical aspects of the present invention are as follows: a base plate and at least two expansion beams extending along a first direction, the at least two expansion beams being spaced apart from each other along a second direction, the first direction and the second direction being perpendicular to each other; One of the expansion beams has at least a first expansion portion that forms a first mounting area between it and the other expansion beam, and a second expansion portion that forms a second mounting area between it and the other expansion beam, and since the widths of the first expansion portion and the second expansion portion along the second direction are not equal, the lengths of the first mounting area and the second mounting area along the second direction are not equal.

[0006] In a preferred embodiment, the second expansion portion comprises a main body portion and a thickened portion, the first expansion portion and the main body portion have equal widths along the second direction and are integrally molded, and the thickened portion is removably provided on the side of the main body portion along the second direction.

[0007] In a preferred embodiment, the side surface of the main body along the second direction and the thickened portion are connected by welding.

[0008] In a preferred embodiment, the second mounting region is used to mount a battery cell group, the thickened portion is removably interposed between the main body portion and the battery cell group, and one side surface along the second direction is abutted against and pressed against the main body portion, and the other side surface along the second direction is abutted against and pressed against the battery cell group.

[0009] In a preferred embodiment, the first expansion portion and the second expansion portion are integrally molded.

[0010] In a preferred embodiment, the expansion beam has a cavity therein in which a plurality of rib plates are provided.

[0011] In a preferred embodiment, at least some of the rib plates are provided so as to be inclined upward along the vertical direction.

[0012] In a preferred embodiment, the battery tray further includes a vertical beam extending along the second direction, a position control groove is provided between the first expansion portion and the second expansion portion, and one end of the vertical beam is engaged and attached within the position control groove.

[0013] A battery pack includes a battery cell group and the battery tray to which the battery cell group is attached.

[0014] The electric equipment includes the battery pack. [Effects of the Invention]

[0015] The beneficial effects of the present invention are as follows:

[0016] In the battery tray, battery pack, and electrical equipment proposed in this invention, a first mounting area is formed between a first expansion portion of one expansion beam and another expansion beam, and a second mounting area is formed between a second expansion portion and another expansion beam. Because the widths of the first and second expansion portions in the second direction are unequal, the lengths of the first and second mounting areas in the second direction are unequal, allowing battery cell groups of different lengths (i.e., having different numbers of battery cells) to be mounted in the first and second mounting areas, respectively. The first expansion portion positions the battery cell groups mounted in the first mounting area, and the second expansion portion positions the battery cell groups mounted in the second mounting area, allowing the same expansion beam to position battery cell groups with different numbers of battery cells, improving the versatility of the battery tray. At the same time, the expansion beams resist expansion deformation of the battery cells, preventing loosening of the solder on the aluminum bus bars connecting the battery cells, preventing short circuits in the battery pack, and improving the safety of the battery pack. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a structural schematic diagram of a battery pack according to an embodiment of the present invention; [Figure 2]1 is a structural schematic diagram of a battery tray according to an embodiment of the present invention. [Figure 3] 1 is a structural schematic diagram of an expansion beam according to an embodiment of the present invention; [Figure 4] FIG. 4 is a partial enlarged view of a portion A in FIG. 3. [Figure 5] 3 is a structural schematic diagram of an expansion beam according to an embodiment of the present invention, which resists expansion deformation of a battery cell; DETAILED DESCRIPTION OF THE INVENTION

[0018] In order to clarify the technical problems to be solved, the technical aspects adopted, and the technical effects achieved by the present invention, the technical solution of the present invention will be further described below by means of specific embodiments with reference to the drawings. It should be understood that the specific examples described herein are only for the purpose of interpreting the present invention and are not intended to limit the present invention. Furthermore, based on the embodiments of the present invention, for ease of explanation, only some, but not all, of the present invention are shown in the drawings.

[0019] In the description of the present invention, unless otherwise clearly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or integration, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, internal communication between two elements, or an interaction between two elements. Those skilled in the art can understand the specific meanings of the above terms in the present invention according to specific circumstances.

[0020] In the present invention, unless otherwise clearly specified or limited, a first feature being "above" or "below" a second feature may include direct contact between the first feature and the second feature, or may include contact between the first feature and the second feature without direct contact but via another feature between them. Furthermore, a first feature being "above," "above," and "on the upper surface" of a second feature may include the first feature being directly above and diagonally above the second feature, or may simply indicate that the horizontal height of the first feature is higher than that of the second feature. A first feature being "below," "below," and "on the lower surface" of a second feature may include the first feature being directly below and diagonally below the second feature, or may simply indicate that the horizontal height of the first feature is lower than that of the second feature.

[0021] In the description of the present embodiment, the terms "upper," "lower," "right," "left," and other orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are merely used to facilitate the description and simplify the operation. They do not indicate or imply that the referenced devices or elements must have a specific orientation, be configured and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are merely used to distinguish between the two in the description and do not have any special meaning.

[0022] Hereinafter, technical aspects of the present invention will be further described by specific embodiments with reference to the drawings.

[0023] Example 1 As shown in FIG. 1 , this embodiment provides a battery pack. The battery pack includes a battery cell group 4 and a battery tray. The battery cell group 4 is attached to the battery tray and includes a plurality of battery cells 40 arranged side by side. The positive and negative poles at the ends of the battery cells 40 are welded together in series by connecting aluminum bus bars. The battery tray includes a bottom plate 1 and an expansion beam 2. The expansion beam 2 is attached to the bottom plate 1. A plurality of battery cell groups 4 are attached to the bottom plate 1 in an array along first and second directions. The plurality of battery cells 40 in the battery cell group 4 are arranged side by side along the length direction of the bottom plate 1 (the second direction in the figure) and are bonded to the bottom plate 1 with a structural adhesive. The expansion beam 2 abuts against the side surfaces of the battery cells 40 in the battery cell group 4 to resist expansion and deformation of the battery cells 40.

[0024] Conventional battery trays are all customized based on the number of battery cells 40, and the expansion beams are regular aluminum profile beams. If the number of battery cells 40 in some battery cell groups 4 varies, the battery cell groups 4 cannot contact the expansion beams, and the size of the expansion beams cannot be adaptively adjusted based on the actual number of battery cells 40, reducing the versatility of the battery tray. When the battery cells 40 expand and deform, the bottoms of the battery cells 40 are glued to the bottom plate of the battery tray to prevent movement, and the tops of the battery cells 40 are subjected to a small restraining force, which can cause loose solder in the connecting aluminum bus bars between the battery cells 40 and pose a risk of short-circuiting the battery pack.

[0025] 1 and 2, the battery tray of this embodiment includes a bottom plate 1 and at least two expansion beams 2 extending along a first direction. The bottom plate 1 is provided with at least two expansion beams 2 spaced apart along a second direction, and the first and second directions are perpendicular to each other. One of the expansion beams 2 includes at least a first expansion portion 21 and a second expansion portion 22. A first mounting region 11 is formed between the first expansion portion 21 and the other expansion beam 2, and a second mounting region 12 is formed between the second expansion portion 22 and the other expansion beam 2. The widths of the first expansion portion 21 and the second expansion portion 22 along the second direction are unequal, and therefore the lengths of the first mounting region 11 and the second mounting region 12 along the second direction are unequal. Because the widths of the first expansion portion 21 and the second expansion portion 22 in the second direction are unequal, the lengths of the first mounting region 11 and the second mounting region 12 are unequal, allowing battery cell groups 4 of different lengths to be mounted in the first mounting region 11 and the second mounting region 12, respectively. The first expansion portion 21 restricts the position of the battery cell group 4 mounted in the first mounting region 11, and the second expansion portion 22 restricts the position of the battery cell group 4 mounted in the second mounting region 12. This allows the same expansion beam 2 to restrict the position of battery cell groups 4 having different numbers of battery cells 40, improving the versatility of the battery tray. At the same time, the expansion beam 2 resists expansion and deformation of the battery cells 40, preventing loosening of the solder of the aluminum bus bars connecting the battery cells 40, preventing short circuits in the battery pack, and improving the safety of the battery pack.

[0026] 1 and 2, in this embodiment, three expansion beams 2 and one longitudinal beam 3 are attached to the bottom plate 1 at intervals along the second direction, and the longitudinal beam 3 extends along the second direction and is assembled sequentially with the three expansion beams 2 to surround four mounting areas that accommodate battery cell groups 4. Specifically, a position restricting groove 23 (as shown in FIG. 4) is provided between the first expansion section 21 and the second expansion section 22, and one end of the longitudinal beam 3 is fitted into and mounted in the position restricting groove 23. Each expansion beam 2 is also provided with a position restricting groove 23, and the longitudinal beam 3 is fitted into the position restricting groove 23 of the three expansion beams 2 sequentially and welded to achieve a strong mounting between the expansion beams 2 and the longitudinal beam 3. Between one of the expansion beams 2 and the expansion beam 2 at the intermediate position, a first mounting area 11 and a second mounting area 12 are enclosed, and between the other expansion beam 2 and the expansion beam 2 at the intermediate position, two third mounting areas 13 are enclosed. Two battery cell groups 4 are mounted in each mounting area, and the two battery cell groups 4 are arranged side by side in the first direction and connected together in series or parallel by a connecting aluminum bus bar at the top. The number of battery cell groups 4 arranged side by side in the first direction in each mounting area can be flexibly adjusted according to actual needs and is not specifically limited herein.

[0027] Note that, since the lengths of the two battery cell groups 4 in the third mounting region 13 along the second direction are equal (i.e., the number of battery cells 40 in the battery cell groups 4 is the same), the two expansion beams 2 surrounding the third mounting region 13 are both straight beams, i.e., the cross-sectional areas of the two expansion beams 2 do not change along the first direction. On the other hand, since the lengths of the first mounting region 11 and the second mounting region 12 along the second direction are not equal, the lengths of the battery cell groups 4 in the first mounting region 11 and the second mounting region 12 are not equal (i.e., the number of battery cells 40 in the battery cell groups 4 are not equal), and at least one expansion beam 2 surrounding the first mounting region 11 and the second mounting region 12 has a cross-sectional area that changes along the first direction.

[0028] 2 , in this embodiment, the length of the battery cell group 4 in the first mounting region 11 along the second direction is greater than the length of the battery cell group 4 in the second mounting region 12 along the second direction; that is, the number of battery cells 40 in the battery cell group 4 in the first mounting region 11 is greater than the number of battery cells 40 in the battery cell group 4 in the second mounting region 12. In other embodiments, the number of battery cells 40 in the battery cell group 4 in the first mounting region 11 may be less than the number of battery cells 40 in the battery cell group 4 in the second mounting region 12, and this can be achieved by adaptively adjusting the lengths of the first mounting region 11 and the second mounting region 12 along the second direction. Hereinafter, an example will be described in which the number of battery cells 40 in the battery cell group 4 in the first mounting region 11 is greater than the number of battery cells 40 in the battery cell group 4 in the second mounting region 12.

[0029] 2 and 3 , the second expansion section 22 includes a main body 221 and a thickened portion 222. The first expansion section 21 and the main body 221 have the same width in the second direction and are integrally molded. The thickened portion 222 is detachably provided on the side of the main body 221 in the second direction. In this embodiment, the first expansion section 21 and the main body 221 are a single straight beam, i.e., the cross-sectional areas of the first expansion section 21 and the main body 221 do not change in the first direction. By adding the thickened portion 222, the width of the second expansion section 22 in the second direction is increased and the length of the second mounting region 12 in the second direction is reduced, allowing a battery cell group 4 having a relatively small number of battery cells 40 to be firmly mounted in the second mounting region 12.

[0030] Specifically, the side surface of the main body 221 along the second direction and the thickened portion 222 are connected by welding. To better resist expansion and deformation of the battery cells 40, the thickened portion 222 is welded to the main body 221 by a welding method such as laser welding, argon arc welding, or friction stir welding, thereby improving the structural strength and stability of the second expansion portion 22. In this embodiment, the expansion beam 2 is an aluminum profile beam, which is light in mass, has high structural strength, and is easy to weld. In other embodiments, the expansion beam 2 may be a steel beam, etc.

[0031] As shown in Figure 4, the expansion beam 2 has a cavity therein with a plurality of rib plates 20. By providing the rib plates 20 inside the expansion beam 2, the structural strength and stability of the expansion beam 2 can be improved, so as to better resist the expansion deformation of the battery cells 40.

[0032] Furthermore, as shown in Figure 5, after the battery cells 40 expand and deform, the bottoms of the battery cells 40 are adhesively connected to the bottom plate 1 to prevent movement, and the restraining force applied to the tops of the battery cells 40 is small, so the tops of the battery cells 40 deform (as indicated by the arrows in Figure 5), causing the solder to loosen in the connecting aluminum bus bars between the battery cells 40. Therefore, on the inside of the side of the expansion beam 2 that abuts against the battery cell group 4, at least a portion of the rib plate 20 is inclined upward along the vertical direction, which allows the rib plate 20 to provide good support for the battery cells 40 and improves the effect of resisting expansion and deformation.

[0033] This embodiment further provides an electric device, which includes an electric main body and a battery pack, the battery pack being attached to the electric main body to provide power to the electric main body, and the electric device may be an electric vehicle, a charging station, etc., and is not specifically limited herein.

[0034] Example 2 This embodiment presents a battery tray, which has almost the same structure as the battery tray in embodiment 1, and is distinguished from the battery tray in embodiment 1 mainly in that the assembly structure of the main body portion 221 and the thickened portion 222 is different.

[0035] Specifically, the thickened portion 222 and the main body 221 are independent components, the second mounting area 12 is used to mount the battery cell group 4, the thickened portion 222 is detachably interposed between the main body 221 and the battery cell group 4, one side of the thickened portion 222 along the second direction is abutted against and pressed against the main body 221, and the other side of the thickened portion 222 along the second direction is abutted against and pressed against the battery cell group 4. The thickened portion 222 and the main body 221 have the same internal structure, and the thickened portion 222 can be flexibly filled and mounted between the main body 221 and the battery cell group 4, thereby realizing flexible mounting of the thickened portion 222. Furthermore, different widths of the thickened portion 222 can be flexibly selected based on the number of battery cells 40 of the battery cell group 4 in the second mounting area 12, eliminating the need to replace the expansion beam 2 and improving the versatility of the battery tray.

[0036] Example 3 This embodiment presents a battery tray, which has almost the same structure as the battery tray in embodiment 1, and is distinguished from the battery tray in embodiment 1 mainly in that the assembly structure of the main body portion 221 and the thickened portion 222 is different.

[0037] Specifically, the first expansion portion 21 and the second expansion portion 22 are integrally molded, i.e., the first expansion portion 21, the main body portion 221, and the thickened portion 222 are integrally molded, and in order to fill the battery cells 40, excess material is removed from the first expansion portion 21 by machining to ensure reliable positioning of the battery cell group 4 in the first mounting area 11. The removal method by machining allows for flexible selection of the amount of removal based on the number of battery cells 40 in the battery cell group 4 in the first mounting area 11, eliminates the need to replace the expansion beam 2, and improves the versatility of the battery tray.

[0038] The above embodiments merely illustrate the basic principles and features of the present invention, and the present invention is not limited to the above embodiments. Various changes and modifications can be made to the present invention without departing from the spirit and scope of the present invention. All of these changes and modifications fall within the scope of the present invention, which is defined by the appended claims and their equivalents. [Explanation of symbols]

[0039] 1...Bottom plate, 11...First mounting area, 12...Second mounting area, 13...Third mounting area, 2...Expansion beam, 20...Rib plate, 21...First expansion portion, 22...Second expansion portion, 221...Main body portion, 222...Increased thickness portion, 23...Position control groove, 3...Vertical beam, 4...Battery cell group, 40...Battery cell.

Claims

1. The device comprises a bottom plate (1) and at least two expansion beams (2) extending along a first direction, the at least two expansion beams (2) being spaced apart from each other along a second direction on the bottom plate (1), the first direction and the second direction being perpendicular to each other; One of the expansion beams (2) has at least a first expansion portion (21) that forms a first attachment region (11) between itself and another of the expansion beams (2) and a second expansion portion (22) that forms a second attachment region (12) between itself and another of the expansion beams (2), and since the widths of the first expansion portion (21) and the second expansion portion (22) along the second direction are not equal, the lengths of the first attachment region (11) and the second attachment region (12) along the second direction are not equal. A battery tray characterized by:

2. The second expansion portion (22) comprises a main body portion (221) and a thickened portion (222), the first expansion portion (21) and the main body portion (221) have the same width along the second direction and are integrally molded, and the thickened portion (222) is removably provided on a side surface of the main body portion (221) along the second direction. The battery tray according to claim 1 .

3. The side surface of the main body portion (221) along the second direction and the thickened portion (222) are connected by welding.

3. The battery tray according to claim 2.

4. The second mounting region (12) is used to mount a battery cell group (4), the thickened portion (222) is removably interposed between the main body portion (221) and the battery cell group (4), and one side surface along the second direction is abutted against and pressed against the main body portion (221), and the other side surface along the second direction is abutted against and pressed against the battery cell group (4).

3. The battery tray according to claim 2.

5. The first expansion portion (21) and the second expansion portion (22) are integrally molded. The battery tray according to claim 1 .

6. The expansion beam (2) has a cavity therein in which a plurality of rib plates (20) are provided.

6. The battery tray according to claim 1, wherein the battery tray is made of a resin.

7. At least a portion of the rib plates (20) are provided inclined upward along the vertical direction.

7. The battery tray according to claim 6.

8. The battery tray further includes a vertical beam (3) extending along the second direction, a position restriction groove (23) is provided between the first expansion portion (21) and the second expansion portion (22), and one end of the vertical beam (3) is engaged and attached within the position restriction groove (23).

6. The battery tray according to claim 1, wherein the battery tray is made of a resin.

9. A battery tray according to any one of claims 1 to 8, comprising a battery cell group (4) and the battery tray to which the battery cell group (4) is attached. A battery pack characterized by:

10. A battery pack according to claim 9, Electrical equipment characterized by:

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