Battery pack and electric equipment

Abstract

The utility model discloses a battery pack and electric equipment, the battery pack comprises a box body, a battery module and a liquid cooling plate assembly, the box body comprises a first box body and a second box body which are arranged up and down, the first box body is provided with a first pressure relief hole penetrating through the side wall of the first box body, and the second box body is provided with a second pressure relief hole penetrating through the side wall of the second box body; the first box body is provided with a downward first opening, and the second box body is provided with a second opening opposite to the first opening; the battery module comprises a first battery module and a second battery module, the first battery module is positioned in the first box body, and the second battery module is positioned in the second box body; the liquid cooling plate assembly is located between the first box body and the second box body and used for separating the first box body from the second box body. According to the battery pack disclosed by the utility model, the liquid cooling plate assembly is used for separating the first box body from the second box body, and when the battery module on one side is subjected to thermal runaway, the battery module on the opposite side cannot be damaged by high-temperature gas, so that the safety of the battery module on the opposite side is improved.

Description

Technical Field

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

[0002] In related technologies, batteries often use a single-layer module design, which cannot meet power requirements. Battery modules are installed in a stacked structure within a battery pack. In the design of a double-layer battery module, due to the lack of a dedicated exhaust and pressure relief channel, when a battery cell in the battery module experiences thermal runaway, the explosion-proof valve of the battery cell will release a large amount of high-temperature gas, which can easily cause thermal runaway in other components or in the normally used battery cells on the opposite side, resulting in the spread and proliferation of thermal runaway. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one objective of the present invention is to provide a battery pack in which a liquid cooling plate assembly is used to separate a first housing and a second housing. When a battery module on one side experiences thermal runaway, the high-temperature gas does not damage the battery module on the opposite side, thereby improving the safety of the battery module on the opposite side.

[0004] The utility model also provides an electrical device having the battery pack.

[0005] According to the embodiment of the first aspect of the present invention, the battery pack includes: a box body, the box body includes a first box body and a second box body arranged up and down, the first box body has a first pressure relief hole penetrating the side wall of the first box body, the second box body has a second pressure relief hole penetrating the side wall of the second box body, the first box body has a first downward opening, and the second box body has a second opening opposite to the first opening; a battery module, the battery module includes a first battery module and a second battery module, the first battery module is located in the first box body, and the second battery module is located in the second box body; a liquid cooling plate assembly, the liquid cooling plate assembly is located between the first box body and the second box body, and is used to separate the first box body and the second box body.

[0006] According to the battery pack of an embodiment of the present invention, the first battery module is located in the first box body, the second battery module is located in the second box body, the liquid cooling plate assembly is used to separate the first box body and the second box body, the first box body has a first pressure relief hole, and the second box body has a second pressure relief hole. The liquid cooling plate assembly components heat or cool the first battery module and the second battery module at the same time, thereby reducing the cost of the battery pack; when thermal runaway occurs in the battery module on one side, due to the separation effect of the liquid cooling plate assembly, the high-temperature gas will not damage the battery module on the opposite side, thereby improving the safety of the battery module on the opposite side.

[0007] According to some embodiments of the present invention, the liquid cooling plate assembly includes a first liquid cooling plate, and the first liquid cooling plate is used to separate the first box and the second box.

[0008] According to some embodiments of the present invention, the liquid cooling plate assembly includes a second liquid cooling plate and a partition, the second liquid cooling plate has at least one window, the second liquid cooling plate has a liquid cooling flow channel extending along the outer periphery of the window, the partition is located on the upper side and / or lower side of the second liquid cooling plate, and the partition is used to separate the first box body and the second box body.

[0009] According to some embodiments of the present invention, the battery pack further includes: a pallet, on which the box body is placed; and a portable handle, which is connected to the pallet.

[0010] According to some embodiments of the present invention, the portable handle includes a first connecting rod, a second connecting rod and a third connecting rod, the upper end of the first connecting rod is connected to one end of the third connecting rod, the upper end of the second connecting rod is connected to the other end of the third connecting rod, and the lower end of the first connecting rod and the lower end of the second connecting rod are both connected to the support plate.

[0011] According to some embodiments of the present invention, two supporting plates are provided, and both supporting plates are located at the bottom of the box body and are spaced apart.

[0012] According to some embodiments of the present invention, the support plate includes a first plate body and a second plate body stacked and connected in the up and down direction, and the first plate body is provided with a plurality of reinforcing ribs protruding in a direction away from the second plate body.

[0013] According to some embodiments of the present invention, the reinforcing rib includes a first connecting plate, a second connecting plate, and a third connecting plate connected between the first connecting plate and the second connecting plate, and the first connecting plate and the second connecting plate extend obliquely in a direction approaching each other.

[0014] According to some embodiments of the present invention, the reinforcing rib includes a first rib and a second rib connected to one end of the first rib. In the thickness direction of the support plate, the second rib protrudes toward a side away from the first rib, and the box body is located on the first rib.

[0015] An electrical device according to an embodiment of the second aspect of the present invention includes: a battery pack according to an embodiment of the first aspect of the present invention.

[0016] According to the electrical equipment of the embodiment of the present invention, by providing the above-mentioned battery pack, the safety of the opposite battery module is improved on the basis of reducing the cost of the battery pack.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a schematic diagram of a battery pack according to some embodiments of the present invention;

[0020] Figure 2 yes Figure 1 Exploded view of the battery pack in Figure 1;

[0021] Figure 3 yes Figure 1 An exploded view of part of the battery pack structure;

[0022] Figure 4 is a schematic diagram of a support plate according to some embodiments of the present utility model;

[0023] Figure 5 Schematic diagrams of support plates according to other embodiments of the present invention;

[0024] Figure 6 is a schematic diagram of a first liquid cooling plate according to some embodiments of the present invention;

[0025] Figure 7 is a schematic diagram of a second liquid cooling plate according to the first embodiment of the present utility model;

[0026] Figure 8 is a schematic diagram of a second liquid cooling plate according to a second embodiment of the present invention;

[0027] Figure 9 is a schematic diagram of a second liquid cooling plate according to a third embodiment of the present utility model;

[0028] Figure 10 Schematic diagram of a second liquid cooling plate according to a fourth embodiment of the present invention.

[0029] Reference numerals:

[0030] 100. Battery pack;

[0031] 10. Box body; 11. First box body; 111. First pressure relief hole; 12. Second box body; 121. Second pressure relief hole; 122. Second opening;

[0032] 20. Battery module; 21. First battery module; 22. Second battery module;

[0033] 30. Liquid cooling plate assembly; 31. First liquid cooling plate; 32. Second liquid cooling plate; 321. Window;

[0034] 40. Support plate; 41. First plate; 411. Reinforcing rib; 4111. First connecting plate; 4112. Second connecting plate; 4113. Third connecting plate; 4114. First convex rib; 4115. Second convex rib; 42. Second plate; 43. Mounting hole;

[0035] 50. Carrying handle; 51. First connecting rod; 52. Second connecting rod; 53. Third connecting rod;

[0036] 61. First sealing member; 62. Second sealing member; 63. Structural adhesive. DETAILED DESCRIPTION

[0037] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0038] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0039] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0040] Reference below Figures 1-10 A battery pack 100 according to an embodiment of the present invention is described.

[0041] According to the battery pack 100 of the first embodiment of the present invention, the battery pack 100 includes a housing 10, a battery module 20, and a liquid cooling plate assembly 30. The housing 10 includes a first housing 11 and a second housing 12 arranged one above the other. The first housing 11 is located above the second housing 12. The first housing 11 has a downward first opening, and the second housing 12 has an upward second opening 122. The second opening 122 is arranged opposite the first opening. For example, the first housing 11 and the second housing 12 can be the same structural member, which can save the cost of opening the molds for the first and second housings 11, 12. When assembling the housing 10, it is not necessary to distinguish between the first and second housings 11, 12, so that the first and second housings 11, 12 can be quickly stacked and formed.

[0042] The battery module 20 includes a first battery module 21 and a second battery module 22. The first battery module 21 is located in the first housing 11, and the second battery module 22 is located in the second housing 12. For example, structural adhesive 63 is applied to the top of the first battery module 21 to secure it to the first housing 11; structural adhesive 63 is applied to the bottom of the second battery module 22 to secure it to the second housing 12.

[0043] The liquid cooling plate assembly 30 is located between the first box body 11 and the second box body 12, and is used to separate the first box body 11 and the second box body 12. The space inside the first box body 11 and the space inside the second box body 12 are independent of each other and are not connected, so that the layered management of the battery module 20 can be achieved. The first battery module 21 can be placed on the liquid cooling plate assembly 30, and the liquid cooling plate assembly 30 provides support for the first battery module 21. For example, thermal conductive adhesive is applied to the upper and lower sides of the liquid cooling plate assembly 30. The thermal conductive adhesive can not only fix the liquid cooling plate assembly 30 and the first battery module 21 and the second battery module 22, but also improve the heat exchange efficiency of the liquid cooling plate assembly 30 to the first battery module 21 and the second battery module 22.

[0044] In a specific example, a first seal 61 is provided at the connection between the first housing 11 and the liquid cooling plate assembly 30. The first seal 61 may be a sealing ring or a sealant. The first seal 61 is used to seal the assembly gap between the first housing 11 and the liquid cooling plate assembly 30, thereby improving the sealing between the first housing 11 and the liquid cooling plate assembly 30. A second seal 62 is provided at the connection between the second housing 12 and the liquid cooling plate assembly 30. The second seal 62 may be a sealing ring or a sealant. The second seal 62 is used to seal the assembly gap between the second housing 12 and the liquid cooling plate assembly 30, thereby improving the sealing between the second housing 12 and the liquid cooling plate assembly 30.

[0045] When the battery module 20 is at a low temperature, the liquid cold plate assembly 30 can simultaneously heat the first battery module 21 and the second battery module 22, maintaining the battery module 20 within a suitable temperature range. When the battery module 20 is charging or discharging, the temperature of the battery module 20 increases, and the liquid cold plate assembly 30 can simultaneously cool the first battery module 21 and the second battery module 22.

[0046] The first housing 11 has a first pressure relief hole 111 extending through a side wall of the first housing 11. The first pressure relief hole 111 communicates with the interior space of the first housing 11. For example, there are multiple first pressure relief holes 111 spaced apart on the side wall of the first housing 11. The second housing 12 has a second pressure relief hole 121 extending through a side wall of the second housing 12. The second pressure relief hole 121 communicates with the interior space of the second housing 12. For example, there are multiple second pressure relief holes 121 spaced apart on the side wall of the second housing 12.

[0047] When thermal runaway occurs in the first battery module 21, the high-temperature gas in the first battery module 21 can be discharged to the outside of the battery pack 100 through the first pressure relief hole 111, that is, the high-temperature gas in the first battery module 21 will not damage the second battery module 22, effectively preventing the spread and propagation of thermal runaway and improving the safety of the second battery module 22.

[0048] When thermal runaway occurs in the second battery module 22, the high-temperature gas in the second battery module 22 can be discharged to the outside of the battery pack 100 through the second pressure relief hole 121, that is, the high-temperature gas in the second battery module 22 will not damage the first battery module 21, effectively preventing the spread and propagation of thermal runaway and improving the safety of the first battery module 21.

[0049] The liquid cooling plate assembly 30 can not only separate the first box body 11 and the second box body 12, but also, when the battery module 20 on one side undergoes thermal runaway, the high-temperature gas will not damage the battery module 20 on the opposite side, thereby improving the safety of the battery module 20 on the opposite side; the liquid cooling plate assembly 30 can also heat or cool the first battery module 21 and the second battery module 22 at the same time, thereby reducing the cost of the battery pack 100.

[0050] According to the battery pack 100 of the embodiment of the present invention, the first battery module 21 is located in the first box body 11, and the second battery module 22 is located in the second box body 12. The liquid cooling plate assembly 30 is used to separate the first box body 11 and the second box body 12. The first box body 11 has a first pressure relief hole 111, and the second box body 12 has a second pressure relief hole 121. The liquid cooling plate assembly 30 simultaneously heats or cools the first battery module 21 and the second battery module 22, thereby reducing the cost of the battery pack 100. When thermal runaway occurs in the battery module 20 on one side, due to the separation effect of the liquid cooling plate assembly 30, the high-temperature gas will not damage the battery module on the opposite side, thereby improving the safety of the battery module on the opposite side.

[0051] According to some embodiments of the present invention, referring to Figure 2-Figure 3 as well as Figure 6 The liquid cooling plate assembly 30 includes a first liquid cooling plate 31, which is used to separate the first housing 11 from the second housing 12. The first liquid cooling plate 31 has a simple structure, mature technology, low cost, and a small size. Furthermore, the first liquid cooling plate 31 has a large contact area with the battery module 20. When placed within the housing 10, the first liquid cooling plate 31 occupies less space in the thickness direction of the housing 10, thereby improving the cooling or heating efficiency of the first liquid cooling plate 31 while reducing the cost of the battery pack 100.

[0052] According to some embodiments of the present invention, referring to Figure 2-Figure 3 as well as Figure 7-10 The liquid cooling plate assembly 30 includes a second liquid cooling plate 32 and a partition. The second liquid cooling plate 32 has at least one window 321. The second liquid cooling plate 32 may have one window 321 or multiple windows 321. The second liquid cooling plate 32 has a liquid cooling channel extending along the outer periphery of the window 321. The partition is located on the upper and / or lower side of the second liquid cooling plate 32 and is used to separate the first box 11 from the second box 12. The partition can be located on the upper side of the second liquid cooling plate 32, or on the lower side of the second liquid cooling plate 32, or both the upper and lower sides of the second liquid cooling plate 32 can be provided. The provision of the window 321 on the second liquid cooling plate 32 allows for the design and planning of the flow direction of the liquid cooling channel to provide different cooling effects on different parts of the battery module 20. It can also reduce the weight of the second liquid cooling plate 32, and thus reduce the weight of the battery pack 100.

[0053] Reference Figure 7The second liquid cooling plate 32 has a first liquid cooling channel, a second liquid cooling channel, and a third liquid cooling channel extending along its length and spaced apart. The first and second liquid cooling channels are located at opposite ends of the second liquid cooling plate 32 in its width direction, and the third liquid cooling channel is located in the middle of the width of the second liquid cooling plate 32. The second liquid cooling plate 32 also has a plurality of fourth liquid cooling channels extending along its width direction. The plurality of fourth liquid cooling channels are spaced apart along its length and serve to connect the first, second, and third liquid cooling channels.

[0054] Reference Figure 8 The second liquid cooling plate 32 has a fifth liquid cooling channel extending along the length direction, and the fifth liquid cooling channel is located at one end of the width direction of the second liquid cooling plate 32. The second liquid cooling plate 32 also has multiple sixth liquid cooling channels extending along the width direction. The multiple sixth liquid cooling channels are arranged at intervals along the length direction of the second liquid cooling plate 32, and the multiple sixth liquid cooling channels are all connected to the fifth liquid cooling channel.

[0055] Reference Figure 9 The second liquid cooling plate 32 has a first “S”-shaped liquid cooling channel, and the second liquid cooling plate 32 also has a seventh liquid cooling channel connected to the middle of the first “S”-shaped liquid cooling channel.

[0056] Reference Figure 10 The second liquid cooling plate 32 has a second "S"-shaped liquid cooling channel, and the second liquid cooling plate 32 also has an eighth liquid cooling channel connected to one side of the second "S"-shaped liquid cooling channel. The eighth liquid cooling channel is located at one end of the second liquid cooling plate 32 in the width direction.

[0057] According to some embodiments of the present invention, referring to Figure 1-Figure 5 The battery pack 100 also includes a support plate 40 and a carrying handle 50. The case 10 is placed on the support plate 40. The support plate 40 is used to support the case 10. The case 10 is firmly placed on the support plate 40. This effectively distributes the pressure of the battery pack 100's weight on the supporting surface and protects the bottom of the case 10 from wear and damage from collisions. At the same time, the presence of the support plate 40 also allows the battery pack 100 to be stably placed in various environments. For example, the case 10 can be attached to the support plate 40 using adhesive.

[0058] The portable handle 50 is connected to the pallet 40. By using the portable handle 50 to move the battery pack 100, users can easily and safely lift and carry the entire battery pack 100, greatly improving the mobility and convenience of the battery pack 100, and achieving the rapid transportation and installation of the battery pack 100. The portable handle 50 is directly connected to the pallet 40, thus firmly fixing the entire portable handle 50 at the bottom of the box body 10, ensuring that during the process of using the portable handle 50 to move the battery pack 100, the portable handle 50 will not break away or loosen due to stress, thereby guaranteeing the stability and safety during the handling of the battery pack 100.

[0059] For example, the cross-section of the portable handle 50 can be O-shaped, "square" shaped or "L" shaped, and the dimensions of the portable handle 50 are correspondingly designed so that the portable handle 50 can bear the weight of the box body 10.

[0060] Optionally, the pallet 40 is also provided with mounting holes 43. When transporting the battery pack 100, bolts can be passed through the mounting holes 43 to fix the battery pack 100 to the handling piece, facilitating transportation and transshipment.

[0061] According to some embodiments of the present utility model, referring to Figure 1-Figure 5 , the portable handle 50 includes a first connecting rod 51, a second connecting rod 52 and a third connecting rod 53. The upper end of the first connecting rod 51 is connected to one end of the third connecting rod 53, and the upper end of the second connecting rod 52 is connected to the other end of the third connecting rod 53. The lower ends of the first connecting rod 51 and the second connecting rod 52 are both connected to the pallet 40. The first connecting rod 51 and the second connecting rod 52 are respectively located on both sides of the box body 10, and the third connecting rod 53 is located above the box body 10. When using the portable handle 50 to carry the box body 10, the force applied to the portable handle 50 when lifting the box body 10 can be effectively dispersed, improving the bearing capacity and safety in use; and with the above structural design of the portable handle 50, the structure of the portable handle 50 can be simple and the bearing capacity can be strong.

[0062] According to some embodiments of the present utility model, referring to Figure 1-Figure 5 , there are two pallets 40. Both of the two pallets 40 are located at the bottom of the box body 10 and are spaced apart, which can reduce the size of the pallet 40 to save the raw materials used for the pallet 40, and thus reduce the cost of the pallet 40. Placing the two pallets 40 spaced apart at the bottom of the box body 10 can evenly disperse the weight of the box body 10 and prevent deformation or damage of the pallet 40 caused by concentrated stress.

[0063] According to some embodiments of the present utility model, referring to Figure 1-Figure 5The support plate 40 includes a first plate 41 and a second plate 42 stacked and connected in the vertical direction. The first plate 41 is provided with a plurality of reinforcing ribs 411, which are spaced apart along the length of the first plate 41 and protrude away from the second plate 42. The ribs 411 are used to increase the structural strength and rigidity of the support plate 40, thereby increasing its load-bearing capacity. They also effectively disperse the pressure generated when the box 10 is placed on the support plate 40, preventing the support plate 40 from deforming or cracking due to excessive force. The ribs 411 also improve the heat dissipation performance of the support plate 40 itself, facilitating the effective conduction of heat from the bottom of the box 10, thereby assisting the liquid cold plate assembly 30 in efficient heat dissipation.

[0064] For example, the first plate 41 may be located above the second plate 42 , that is, the box 10 is located on the first plate 41 ; or the second plate 42 may be located above the first plate 41 , that is, the box 10 is located on the second plate 42 .

[0065] According to some embodiments of the present invention, referring to Figure 1-Figure 5 The reinforcing rib 411 includes a first connecting plate 4111, a second connecting plate 4112 and a third connecting plate 4113. The third connecting plate 4113 is connected between the first connecting plate 4111 and the second connecting plate 4112. The first connecting plate 4111 and the second connecting plate 4112 extend obliquely toward each other. The reinforcing rib 411 adopts a "J"-shaped structural design. The inclined reinforcing rib 411 helps to improve the bending resistance of the local area of ​​the support plate 40, so as to further increase the structural strength and rigidity of the support plate 40.

[0066] According to some embodiments of the present invention, referring to Figure 1 、 Figure 5 The reinforcing rib 411 includes a first rib 4114 and a second rib 4115. The second rib 4115 is connected to one end of the first rib 4114. In the thickness direction of the support plate 40, the second rib 4115 protrudes toward the side away from the first rib 4114. The housing 10 is located on the first rib 4114. The second rib 4115 protrudes toward the housing 10. The second rib 4115 can further enhance the mechanical properties of the support plate 40 in specific directions, such as its bending and torsional resistance. It can also improve the flow characteristics of air flowing through the support plate 40, thereby enhancing the heat dissipation of the battery pack 100.

[0067] The electrical equipment according to the embodiment of the second aspect of the present invention includes: the battery pack 100 according to the embodiment of the first aspect of the present invention.

[0068] According to the electrical equipment of the embodiment of the present invention, by providing the above-mentioned battery pack 100 , the safety of the opposite battery module 20 is improved while reducing the cost of the battery pack 100 .

[0069] Throughout this specification, references to terms such as "some embodiments," "optionally," "further," or "some examples" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0070] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: include: A box body, the box body comprises a first box body and a second box body arranged up and down, the first box body has a first pressure relief hole penetrating through a side wall of the first box body, the second box body has a second pressure relief hole penetrating through a side wall of the second box body, the first box body has a first opening downward, and the second box body has a second opening opposite to the first opening; A battery module, the battery module comprising a first battery module and a second battery module, the first battery module is located in the first box, and the second battery module is located in the second box; A liquid cooling plate assembly is located between the first box body and the second box body, and is used to separate the first box body from the second box body.

2. The battery pack according to claim 1, characterized in that: The liquid cooling plate assembly includes a first liquid cooling plate, and the first liquid cooling plate is used to separate the first box body from the second box body.

3. The battery pack according to claim 1, characterized in that: The liquid cooling plate assembly includes a second liquid cooling plate and a partition, the second liquid cooling plate has at least one window, the second liquid cooling plate has a liquid cooling channel extending along the outer periphery of the window, the partition is located on the upper side and / or the lower side of the second liquid cooling plate, and the partition is used to separate the first box body from the second box body.

4. The battery pack according to claim 1, characterized in that: Also includes: A pallet, on which the box is placed; A portable handle is connected to the support plate.

5. The battery pack according to claim 4, characterized in that: The portable handle includes a first connecting rod, a second connecting rod and a third connecting rod, the upper end of the first connecting rod is connected to one end of the third connecting rod, the upper end of the second connecting rod is connected to the other end of the third connecting rod, and the lower ends of the first connecting rod and the second connecting rod are both connected to the support plate.

6. The battery pack according to claim 4, characterized in that: There are two support plates, and both of the two support plates are located at the bottom of the box body and are spaced apart.

7. The battery pack according to claim 6, characterized in that: The support plate includes a first plate body and a second plate body which are stacked and connected in the up-down direction, and the first plate body is provided with a plurality of reinforcing ribs which protrude in a direction away from the second plate body.

8. The battery pack according to claim 7, characterized in that: The reinforcing rib includes a first connecting plate, a second connecting plate, and a third connecting plate connected between the first connecting plate and the second connecting plate, and the first connecting plate and the second connecting plate extend obliquely in a direction approaching each other.

9. The battery pack according to claim 7, characterized in that: The reinforcing rib includes a first convex rib and a second convex rib connected to one end of the first convex rib. In the thickness direction of the support plate, the second convex rib protrudes toward a side away from the first convex rib, and the box body is located on the first convex rib.

10. An electrical device, characterized in that: include: The battery pack according to any one of claims 1 to 9.

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