Battery tray, battery pack and electric equipment

Abstract

The utility model relates to the technical field of batteries, in particular to a battery tray, a battery pack and electric equipment. The battery tray comprises a bottom plate and at least two expansion beams extending in the first direction, the at least two expansion beams are arranged on the bottom plate in the second direction at intervals, and the first direction is perpendicular to the second direction. Wherein one expansion beam at least comprises a first expansion part and a second expansion part, a first mounting area is formed between the first expansion part and the other expansion beam, and a second mounting area is formed between the second expansion part and the other expansion beam. The widths of the first expansion part and the second expansion part in the second direction are unequal, so that the lengths of the first mounting area and the second mounting area in the second direction are unequal. The battery pack and the electric equipment comprise the battery tray, and the same expansion beam of the battery tray is used for limiting the battery cell groups with different lengths respectively, so that the universality of the battery tray is improved. The expansion beams can resist expansion deformation of the battery cells, so that short circuit of the battery pack caused by sealing-off of a connecting aluminum row of the battery cells is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery tray, a battery pack and electrical equipment. Background Art

[0002] In the battery pack, an expansion beam is installed on the bottom plate of the battery tray to limit the position of the battery cell group. Multiple battery cell groups are installed on the bottom plate at intervals along the width direction of the bottom plate, and multiple battery cells in the battery cell group are bonded to the bottom plate by structural adhesive. The expansion beam abuts against the side of the battery cell in the battery cell group to resist the expansion and deformation of the battery cell.

[0003] Existing battery trays are all customized based on the number of battery cells, and the expansion beam is a regular aluminum profile beam. When the number of battery cells in some battery cell groups is different, the battery cell group cannot contact the expansion beam, so that the size of the expansion beam cannot be adaptively adjusted according to the actual number of battery cells, resulting in poor versatility of the battery tray. When the battery cell expands and deforms, the bottom of the battery cell is bonded to the bottom plate and remains stationary, while the top of the battery cell is subject to less restraint, resulting in the connection between the battery cells. The aluminum bar becomes unsoldered, and the battery pack is at risk of short circuit. Utility Model Content

[0004] The utility model aims to provide a battery tray, a battery pack and an electrical device, so as to limit the positions of battery cell groups of different lengths, improve the versatility of the battery tray and avoid short circuits in the battery pack.

[0005] To achieve this purpose, the technical solution adopted by the utility model is:

[0006] A battery tray, comprising a bottom plate and at least two expansion beams extending along a first direction, wherein at least two expansion beams are arranged on the bottom plate at intervals along a second direction, and the first direction is perpendicular to the second direction;

[0007] One of the expansion beams includes at least a first expansion portion and a second expansion portion, a first installation area is formed between the first expansion portion and the other expansion beam, and a second installation area is formed between the second expansion portion and the other expansion beam; the widths of the first expansion portion and the second expansion portion along the second direction are unequal, so that the lengths of the first installation area and the second installation area along the second direction are unequal.

[0008] As a preferred solution, the second expansion portion includes a main body and a thickening portion, the first expansion portion and the main body have equal widths along the second direction and are integrally formed, and the thickening portion is detachably provided on a side surface of the main body along the second direction.

[0009] As a preferred solution, the side surface of the main body along the second direction is connected to the thickened portion by welding.

[0010] As a preferred embodiment, the second installation area is used to install the battery cell group, the thickened portion is detachably clamped between the main body and the battery cell group, and one side surface of the thickened portion along the second direction is in contact with and pressed against the main body, and the other side surface of the thickened portion along the second direction is in contact with and pressed against the battery cell group.

[0011] As a preferred solution, the first expansion portion and the second expansion portion are integrally formed.

[0012] As a preferred solution, the expansion beam has a cavity inside, and a plurality of ribs are arranged in the cavity.

[0013] As a preferred solution, at least part of the ribs are arranged to be inclined upward along the vertical direction.

[0014] As a preferred solution, the battery tray further includes a longitudinal beam extending along the second direction, a limiting groove is provided between the first expansion portion and the second expansion portion, and one end of the longitudinal beam is snap-fitted and installed in the limiting groove.

[0015] A battery pack comprises a battery cell group and the above-mentioned battery tray, wherein the battery cell group is mounted on the battery tray.

[0016] Electrical equipment, including the above-mentioned battery pack.

[0017] The beneficial effects of the utility model are:

[0018] The battery tray, battery pack and electrical equipment proposed by the utility model form a first installation area between the first expansion part of an expansion beam and another expansion beam, and a second installation area is formed between the second expansion part and another expansion beam. The widths of the first expansion part and the second expansion part along the second direction are not equal, so that the lengths of the first installation area and the second installation area along the second direction are not equal, so that the first installation area and the second installation area can respectively install battery cell groups of different lengths (that is, having different numbers of battery cells). The first expansion part limits the battery cell group installed in the first installation area, and the second expansion part limits the battery cell group installed in the second installation area, so that the same expansion beam can limit the battery cell groups with different numbers of battery cells, respectively, thereby improving the versatility of the battery tray. At the same time, the expansion beam can resist the expansion and deformation of the battery cell, avoid the desoldering of the connecting aluminum bars of the battery cell, prevent the battery pack from short circuiting, and improve the safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of a battery pack provided by an embodiment of the utility model;

[0020] Figure 2 It is a structural schematic diagram of a battery tray provided by an embodiment of the utility model;

[0021] Figure 3 It is a structural schematic diagram of an expansion beam provided by an embodiment of the utility model;

[0022] Figure 4 yes Figure 3 A partial enlarged view of the middle part;

[0023] Figure 5 It is a schematic diagram of the structure of the expansion beam provided by the embodiment of the utility model for resisting the expansion and deformation of the battery core.

[0024] The names and numbers of the components in the figure are as follows:

[0025] 1. Bottom plate; 11. First installation area; 12. Second installation area; 13. Third installation area; 2. Expansion beam; 20. Rib plate; 21. First expansion part; 22. Second expansion part; 221. Main body; 222. Thickening part; 23. Limiting groove; 3. Longitudinal beam; 4. Battery cell group; 40. Battery cell. DETAILED DESCRIPTION

[0026] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all of them.

[0027] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0029] In the description of this embodiment, the terms "upper", "lower", "right", "left" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0030] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0031] like Figure 1 As shown, this embodiment proposes a battery pack, which includes a battery cell group 4 and a battery tray. The battery cell group 4 is installed on the battery tray. The battery cell group 4 includes a plurality of battery cells 40 arranged side by side. The positive and negative poles at the top of the battery cells 40 are connected in series by connecting aluminum bars and welding. The battery tray includes a bottom plate 1 and an expansion beam 2. The expansion beam 2 is installed on the bottom plate 1. A plurality of battery cell groups 4 are installed in an array along a first direction and a second direction on the bottom plate 1, and a 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 bonded to the bottom plate 1 by structural adhesive. The expansion beam 2 abuts against the side of the battery cell 40 in the battery cell group 4 to resist the expansion and deformation of the battery cell 40.

[0032] Existing battery trays are all customized based on the number of battery cells 40, and the expansion beam is a regular aluminum profile beam. When the number of battery cells 40 in some battery cell groups 4 is different, the battery cell group 4 cannot contact the expansion beam, so that the size of the expansion beam cannot be adaptively adjusted according to the actual number of battery cells 40, resulting in poor versatility of the battery tray. When the battery cell 40 expands and deforms, the bottom of the battery cell 40 is bonded to the bottom plate of the battery tray and remains stationary, while the top of the battery cell 40 is subject to less restraint force, resulting in the connection between the battery cells 40. The aluminum bar becomes desoldered, and the battery pack is at risk of short circuit.

[0033] To solve the above problems, Figure 1 and Figure 2As shown, the battery tray of this embodiment includes a bottom plate 1 and at least two expansion beams 2 extending along a first direction, and at least two expansion beams 2 are arranged on the bottom plate 1 at intervals along a second direction, and the first direction is perpendicular to the second direction. One of the expansion beams 2 includes at least a first expansion portion 21 and a second expansion portion 22, and a first installation area 11 is formed between the first expansion portion 21 and the other expansion beam 2, and a second installation area 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 not equal, so that the lengths of the first installation area 11 and the second installation area 12 along the second direction are not equal. Since the widths of the first expansion portion 21 and the second expansion portion 22 along the second direction are not equal, so that the lengths of the first installation area 11 and the second installation area 12 along the second direction are not equal, the first installation area 11 and the second installation area 12 can respectively install battery cell groups 4 of different lengths. The first expansion portion 21 limits the battery cell group 4 installed in the first installation area 11, and the second expansion portion 22 limits the battery cell group 4 installed in the second installation area 12, so that the same expansion beam 2 can respectively limit the battery cell groups 4 with different numbers of battery cells 40, thereby improving the versatility of the battery tray. At the same time, the expansion beam 2 can resist the expansion and deformation of the battery cells 40, avoid the desoldering of the connecting aluminum bars of the battery cells 40, prevent the battery pack from short circuiting, and improve the safety of the battery pack.

[0034] like Figure 1 and Figure 2 As shown, three expansion beams 2 and a longitudinal beam 3 are installed on the bottom plate 1 of this embodiment, and the longitudinal beam 3 extends along the second direction and is assembled with the three expansion beams 2 in sequence to enclose four installation areas for accommodating the battery cell group 4. Specifically, a limiting groove 23 (such as Figure 4 As shown), one end of the longitudinal beam 3 is snap-fitted and installed in the limiting groove 23. A limiting groove 23 is provided on each expansion beam 2, and the longitudinal beam 3 is snap-fitted and welded in the limiting grooves 23 of the three expansion beams 2 in turn to achieve a stable installation of the expansion beam 2 and the longitudinal beam 3. A first installation area 11 and a second installation area 12 are enclosed between one expansion beam 2 and the expansion beam 2 in the middle position, and two third installation areas 13 are enclosed between another expansion beam 2 and the expansion beam 2 in the middle position. Two battery cell groups 4 are installed in each installation area, and the two battery cell groups 4 are arranged side by side along the first direction and are connected in series or in parallel through the connecting aluminum bar on the top. The number of battery cell groups 4 arranged side by side along the first direction in each installation area can be flexibly adjusted according to actual needs, and is not specifically limited here.

[0035] It should be noted that the lengths of the two battery cell groups 4 in the third installation area 13 along the second direction are equal (i.e., the number of battery cells 40 in the battery cell groups 4 is the same), so that the two expansion beams 2 surrounding the third installation area 13 are both straight beams, that is, the cross-sectional areas of the two expansion beams 2 do not change along the first direction. However, the lengths of the first installation area 11 and the second installation area 12 along the second direction are not equal, so that the lengths of the battery cell groups 4 in the first installation area 11 and the second installation area 12 are not equal (i.e., the number of battery cells 40 in the battery cell groups 4 is not equal), so that at least one expansion beam 2 surrounding the first installation area 11 and the second installation area 12 has a changing cross-sectional area along the first direction.

[0036] like Figure 2 As shown, in this embodiment, the length of the battery cell group 4 in the first installation area 11 along the second direction is greater than the length of the battery cell group 4 in the second installation area 12 along the second direction, that is, the number of battery cells 40 in the battery cell group 4 in the first installation area 11 is greater than the number of battery cells 40 in the battery cell group 4 in the second installation area 12. In other embodiments, the number of battery cells 40 in the battery cell group 4 in the first installation area 11 can also be less than the number of battery cells 40 in the battery cell group 4 in the second installation area 12, and the lengths of the first installation area 11 and the second installation area 12 along the second direction can be adaptively adjusted. The following is an example in which the number of battery cells 40 in the battery cell group 4 in the first installation area 11 is greater than the number of battery cells 40 in the battery cell group 4 in the second installation area 12.

[0037] like Figure 2 and Figure 3 As shown, the second expansion portion 22 includes a main body 221 and a thickening portion 222. The first expansion portion 21 and the main body 221 have the same width along the second direction and are integrally formed. The side of the main body 221 along the second direction is detachably provided with the thickening portion 222. In this embodiment, the first expansion portion 21 and the main body 221 are a straight beam, that is, the cross-sectional area of ​​the first expansion portion 21 and the main body 221 does not change along the first direction. By additionally adding the thickening portion 222, the width of the second expansion portion 22 along the second direction is increased, thereby reducing the length of the second installation area 12 along the second direction, so that the battery cell group 4 with fewer battery cells 40 can be stably installed in the second installation area 12.

[0038] Specifically, the side of the main body 221 along the second direction is welded to the thickened portion 222. The thickened portion 222 is welded to the main body 221 by laser welding, argon arc welding or stir friction welding, thereby improving the structural strength and stability of the second expansion portion 22, and better resisting the expansion deformation of the battery cell 40. The expansion beam 2 of this embodiment is an aluminum profile beam, which is light in weight, high in structural strength and easy to weld. In other embodiments, the expansion beam 2 can also be a steel beam.

[0039] like Figure 4As shown, the expansion beam 2 has a cavity inside, and a plurality of ribs 20 are arranged in the cavity. By arranging the ribs 20 inside the expansion beam 2, the structural strength and stability of the expansion beam 2 are improved, so as to better resist the expansion deformation of the battery cell 40.

[0040] Furthermore, if Figure 5 As shown, when the battery cell 40 expands and deforms, the top of the battery cell 40 is subject to a smaller restraining force because the bottom of the battery cell 40 is bonded and connected to the bottom plate 1 and remains stationary, causing the top of the battery cell 40 to deform (as shown in FIG. Figure 5 Therefore, inside the side where the expansion beam 2 abuts against the battery cell group 4, at least part of the rib plate 20 is arranged upwardly and tilted in the vertical direction, so that the rib plate 20 can provide good support for the battery cell 40, thereby improving the effect of resisting expansion deformation.

[0041] This embodiment also proposes an electric device, which includes a power-consuming host and a battery pack, wherein the battery pack is installed on the power-consuming host to provide power to the power-consuming host. The power-consuming device can be an electric vehicle, a charging station, etc., which is not specifically limited here.

[0042] Embodiment 2

[0043] This embodiment proposes a battery tray, which has a structure substantially the same as that of the battery tray in the first embodiment. The main difference between the battery tray in this embodiment and the battery tray in the first embodiment is that the assembly structure of the main body 221 and the thickened portion 222 is different.

[0044] Specifically, the thickening portion 222 and the main body 221 are independent components, and the second installation area 12 is used to install the battery cell group 4. The thickening portion 222 is detachably clamped between the main body 221 and the battery cell group 4, and one side of the thickening portion 222 along the second direction is in contact with and pressed against the main body 221, and the other side of the thickening portion 222 along the second direction is in contact with and pressed against the battery cell group 4. The thickening portion 222 has the same internal structure as the main body 221, and the thickening portion 222 can be flexibly filled and installed between the main body 221 and the battery cell group 4, thereby achieving flexible installation of the thickening portion 222. Moreover, the thickening portion 222 of different widths can be flexibly selected according to the number of battery cells 40 of the battery cell group 4 in the second installation area 12, without the need to replace the expansion beam 2, thereby improving the versatility of the battery tray.

[0045] Embodiment 3

[0046] This embodiment proposes a battery tray, which has a structure substantially the same as that of the battery tray in the first embodiment. The main difference between the battery tray in this embodiment and the battery tray in the first embodiment is that the assembly structure of the main body 221 and the thickened portion 222 is different.

[0047] Specifically, the first expansion portion 21 and the second expansion portion 22 are integrally formed, that is, the first expansion portion 21, the main body portion 221 and the thickened portion 222 are integrally formed, and the excess portion is removed at the first expansion portion 21 by machining to fill the battery cell 40, so as to achieve reliable positioning of the battery cell group 4 in the first installation area 11. The removal amount can be flexibly selected according to the number of battery cells 40 in the battery cell group 4 in the first installation area 11 by machining, without replacing the expansion beam 2, thereby improving the versatility of the battery tray.

[0048] The above embodiments are only to illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and modifications, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. Battery tray, characterized in that, It comprises a base plate (1) and at least two expansion beams (2) extending along a first direction, wherein at least two expansion beams (2) are arranged on the base plate (1) at intervals along a second direction, and the first direction is perpendicular to the second direction; One of the expansion beams (2) comprises at least a first expansion portion (21) and a second expansion portion (22); a first installation area (11) is formed between the first expansion portion (21) and the other expansion beam (2); a second installation area (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, so that the lengths of the first installation area (11) and the second installation area (12) along the second direction are unequal.

2. The battery tray according to claim 1, characterized in that: 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 formed; the thickened portion (222) is detachably provided on a side surface of the main body portion (221) along the second direction.

3. The battery tray according to claim 2, characterized in that: The side surface of the main body portion (221) along the second direction is connected to the thickened portion (222) by welding.

4. The battery tray according to claim 2, characterized in that: The second installation area (12) is used to install the battery cell group (4); the thickened portion (222) is detachably clamped between the main body (221) and the battery cell group (4); one side surface of the thickened portion (222) along the second direction is in contact with and tightly pressed against the main body (221); and the other side surface of the thickened portion (222) along the second direction is in contact with and tightly pressed against the battery cell group (4).

5. The battery tray according to claim 1, characterized in that: The first expansion portion (21) and the second expansion portion (22) are integrally formed.

6. The battery tray according to any one of claims 1 to 5, characterized in that: The expansion beam (2) has a cavity inside, and a plurality of rib plates (20) are arranged in the cavity.

7. The battery tray according to claim 6, characterized in that: At least part of the rib plates (20) are arranged to be inclined upward in the vertical direction.

8. The battery tray according to any one of claims 1 to 5, characterized in that: The battery tray further comprises a longitudinal beam (3) extending along the second direction, a limiting groove (23) is provided between the first expansion portion (21) and the second expansion portion (22), and one end of the longitudinal beam (3) is snap-fitted and installed in the limiting groove (23).

9. A battery pack, characterized in that: It comprises a battery cell group (4) and a battery tray according to any one of claims 1 to 8, wherein the battery cell group (4) is mounted on the battery tray.

10. Electrical equipment, characterized in that: A battery pack comprising the battery pack of claim 9.

Images