Shell for battery pack, battery pack and electric equipment

Abstract

The utility model discloses a shell for a battery pack, the battery pack and electric equipment. The shell comprises a tray and a cover plate, the tray comprises a tray body and at least one first tray beam, one side of the tray body is open, and the first tray beams are arranged in the tray body and divide the interior of the tray body into a plurality of containing spaces. The cover plate is arranged on the open side of the tray, at least one matching groove is formed in one of the cover plate and the first tray beam, at least one matching protrusion is arranged on the other one of the cover plate and the first tray beam, and the matching protrusion is matched with the matching groove in a sealing mode so that the containing spaces can be separated. Therefore, by means of the mode that the matching groove is matched with the matching protrusion, the installation structure can be simplified, the installation reliability of the cover plate and the first tray beam can be improved, the smoke transfer path can be increased during thermal runaway, the possibility of heat transfer between different containing spaces can be reduced, and the heat transfer efficiency during thermal runaway can be effectively reduced; and the use safety of the battery pack is improved.

Description

Technical Field

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

[0002] In the prior art, the electrical connections between different battery modules are made using ordinary aluminum connecting plates, and plastic brackets are used for insulation. When thermal runaway occurs in the battery module, the plastic bracket is easily melted, resulting in insulation failure, and the connecting plates are easily arced with the tray. In addition, the structural strength of the tray is weak and is easily squeezed and deformed. Heat is easily transferred between multiple battery modules, causing the thermal runaway of the battery pack to spread or even catch fire. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the first purpose of the utility model is to provide a shell for a battery pack, which can prevent heat from being transferred between multiple battery modules during thermal runaway.

[0004] The second objective of the present invention is to provide a battery pack, comprising the above-mentioned shell for the battery pack.

[0005] The third objective of the present utility model is to provide an electrical device, comprising the battery pack described in the above embodiment.

[0006] According to the embodiment of the first aspect of the utility model, the shell for a battery pack includes: a tray and a cover plate, wherein the tray includes a tray body and at least one first tray beam, one side of the tray body is open, the first tray beam is arranged in the tray body and divides the interior of the tray body into a plurality of accommodating spaces; the cover plate is arranged on the one side of the tray, at least one matching groove is formed on the cover plate and one of the first tray beams, and at least one matching protrusion is provided on the cover plate and the other of the first tray beams, and the matching protrusion is sealed and matched with the matching groove to separate the plurality of the accommodating spaces.

[0007] According to the shell for the battery pack of the embodiment of the utility model, a mating groove is provided on one of the cover plate and the first pallet beam, and a mating protrusion is provided on the other. The mating groove and the mating protrusion cooperate in a manner that simplifies the installation structure and improves the reliability of the installation of the cover plate and the first pallet beam. The mating protrusion and the mating groove cooperate in a manner that increases the path of smoke transfer during thermal runaway and reduces the possibility of heat transfer between different accommodating spaces. The efficiency of heat transfer during thermal runaway can be effectively reduced, and the safety of the battery pack can be increased.

[0008] In some embodiments, the mating protrusion is provided on the surface of the cover plate facing the pallet, and the mating groove is formed on the surface of the first pallet beam facing the cover plate; and / or the mating groove is formed on the surface of the cover plate facing the pallet, and the mating protrusion is provided on the surface of the first pallet beam facing the cover plate.

[0009] In some embodiments, there are multiple mating protrusions and multiple mating grooves, each of which extends along the length direction of the first pallet beam, and the multiple mating protrusions and multiple mating grooves are arranged along the width direction of the first pallet beam.

[0010] In some embodiments, the outer shell for the battery pack further includes: a first seal, wherein the first seal is disposed between the mating protrusion and the inner wall of the mating groove.

[0011] In some embodiments, the first sealing member is a sealant.

[0012] In some embodiments, the shell for the battery pack also includes: at least one second pallet beam and at least one reinforcing structure, the second pallet beam is arranged in the pallet body, the second pallet beam is cross-arranged with the first pallet beam, and at least one cavity is formed in the second pallet beam; the reinforcing structure is arranged in the cavity.

[0013] In some embodiments, at least one of the cavities constitutes an exhaust passage.

[0014] In some embodiments, the reinforcement structure is a hollow structure, and an exhaust channel is formed inside the reinforcement structure.

[0015] In some embodiments, the reinforcement structure is bonded, bolted, or interference-fitted to the second pallet beam.

[0016] In some embodiments, the reinforcement structure is an aluminum part or a steel part.

[0017] In some embodiments, the second tray beam is an insulator.

[0018] According to the second aspect of the present invention, the battery pack comprises: a shell and a plurality of battery modules, wherein the shell is the shell for the battery pack described in any one of the above embodiments; the plurality of battery modules are respectively arranged in a plurality of accommodating spaces of the tray of the shell.

[0019] In some embodiments, the battery modules in two adjacent accommodating spaces are electrically connected via a connecting sheet assembly.

[0020] In some embodiments, the connecting piece assembly includes: a mounting bracket, a connecting piece device, and a potting compound. The mounting bracket is disposed in the outer shell, and the mounting bracket is located between the battery modules in two adjacent accommodating spaces; the connecting piece device is disposed on the mounting bracket, and the battery modules in two adjacent accommodating spaces are electrically connected through the connecting piece device; the potting compound is filled between the mounting bracket and the connecting piece device.

[0021] In some embodiments, the connecting plate device includes: a first connecting plate, a second connecting plate, and a third connecting plate, the first connecting plate and the second connecting plate are arranged on the mounting bracket and are spaced apart from each other, the first connecting plate and the second connecting plate are respectively connected to the battery modules in two adjacent accommodating spaces; the third connecting plate is connected between the first connecting plate and the second connecting plate.

[0022] In some embodiments, one end of the first connecting piece and the second connecting piece are respectively connected to the battery modules in two adjacent accommodating spaces; the mounting bracket includes: a first bracket, a second bracket, and a third bracket, the first bracket is arranged in the outer shell, and a accommodating groove is formed on the first bracket, and the other ends of the first connecting piece and the second connecting piece are arranged in the accommodating groove at a distance from each other; at least a portion of the second bracket is fitted in the accommodating groove and separates the other ends of the first connecting piece and the second connecting piece, the third connecting piece is passed through the second bracket, and the two ends of the third connecting piece are respectively connected to the first connecting piece and the second connecting piece; the third bracket is arranged on a side of the second bracket away from the first bracket, and the potting glue is filled between the first bracket and the third bracket.

[0023] In some embodiments, the first bracket, the second bracket and the third bracket are made of ceramic or bakelite.

[0024] In some embodiments, the connecting plate assembly includes: a fourth connecting plate and a fifth connecting plate, and a cutting device, wherein one end of the fourth connecting plate and the fifth connecting plate are respectively connected to the battery modules in the two adjacent accommodating spaces, and the other ends of the fourth connecting plate and the fifth connecting plate are connected to each other; the cutting device is arranged in the outer shell, and when the voltage of the battery module reaches a preset voltage threshold, or the temperature in the accommodating space reaches a preset temperature threshold, the cutting device cuts off the connection between the other ends of the fourth connecting plate and the fifth connecting plate.

[0025] In some embodiments, the cutting device includes: a base, a shell, and a cutter, wherein the shell is disposed on the base, and the shell and the base define a accommodating cavity, and the other ends of the fourth connecting piece and the fifth connecting piece are located in the accommodating cavity; the cutter is movably disposed in the accommodating cavity, and when the voltage of the battery module reaches the preset voltage threshold, or the temperature in the accommodating space reaches the preset temperature threshold, the cutter cuts off the connection between the other ends of the fourth connecting piece and the fifth connecting piece.

[0026] In some embodiments, the other ends of the fourth connecting piece and the fifth connecting piece are connected via a connecting portion, a cutting area is provided between the connecting portion and the fourth connecting piece and the fifth connecting piece, and the cutting knife is opposite to the cutting area.

[0027] In some embodiments, the thickness of the cutting zone along the movement direction of the cutter is smaller than the thickness of the fourth connecting piece along the movement direction of the cutter, the thickness of the cutting zone along the movement direction of the cutter is smaller than the thickness of the fifth connecting piece along the movement direction of the cutter, and the thickness of the cutting zone along the movement direction of the cutter is smaller than the thickness of the connecting portion along the movement direction of the cutter.

[0028] In some embodiments, the cutter is a non-metallic part.

[0029] In some embodiments, the connecting plate assembly includes: a sixth connecting plate, a seventh connecting plate, and an eighth connecting plate, and one end of the sixth connecting plate and the seventh connecting plate are respectively connected to the battery modules in the two adjacent accommodating spaces; the two ends of the eighth connecting plate are respectively connected to the other ends of the sixth connecting plate and the seventh connecting plate, and the melting point of the eighth connecting plate is less than or equal to the melting point of any one of the sixth connecting plate and the seventh connecting plate.

[0030] In some embodiments, the thickness of the eighth connecting sheet is less than or equal to the thickness of any one of the sixth connecting sheet and the seventh connecting sheet.

[0031] The electrical equipment according to the embodiment of the third aspect of the utility model comprises the battery pack described in any one of the above embodiments.

[0032] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0034] Figure 1 It is a three-dimensional disassembly schematic diagram of a battery pack according to an embodiment of the utility model.

[0035] Figure 2 Schematic diagram of a tray according to an embodiment of the utility model.

[0036] Figure 3 It is a schematic diagram of a connecting piece assembly according to an embodiment of the utility model.

[0037] Figure 4 It is a three-dimensional disassembled schematic diagram of a connecting piece assembly according to an embodiment of the utility model.

[0038] Figure 5 Schematic diagram of a first pallet beam according to an embodiment of the utility model.

[0039] Figure 6 It is a cross-sectional schematic diagram of a battery pack according to an embodiment of the utility model.

[0040] Figure 7 yes Figure 6 Schematic diagram of the enlarged P region.

[0041] Figure 8 It is a cross-sectional schematic diagram of a battery pack according to another embodiment of the utility model.

[0042] Fig. 9 yes Figure 8 Schematic enlargement of the mid-Q region.

[0043] Fig.10 It is a schematic diagram of a cutting device according to an embodiment of the utility model.

[0044] Fig.11 It is a three-dimensional disassembled schematic diagram of a cutting device according to an embodiment of the utility model.

[0045] Fig.12 It is a schematic diagram of the fourth connecting piece and the fifth connecting piece according to an embodiment of the utility model.

[0046] Fig.13 It is a schematic diagram of the sixth connecting piece and the seventh connecting piece according to an embodiment of the utility model.

[0047] Reference numerals:

[0048] 1. Battery pack; 2. Casing; 3. Battery module; 4. Connector assembly;

[0049] 10. Pallet; 11. First pallet beam; 12. Second pallet beam; 121. Cavity; 13. Accommodation space; 14. Strengthening structure;

[0050] 20. Cover plate; 21. Matching groove; 22. Matching protrusion;

[0051] 30. a first sealing member;

[0052] 41. mounting bracket; 411. first bracket; 412. second bracket; 413. third bracket; 42. connecting piece device; 421. first connecting piece; 422. second connecting piece; 423. third connecting piece; 424. fourth connecting piece; 425. fifth connecting piece; 43. potting glue; 44. connecting part; 45. cutting area; 461. sixth connecting piece; 462. seventh connecting piece; 463. eighth connecting piece;

[0053] 50. Cutting device; 51. Base; 52. Housing; 53. Cutter; 54. Controller. DETAILED DESCRIPTION

[0054] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figure 1-Figure 13 The housing 2 for a battery pack 1 according to an embodiment of the utility model is described, including: a tray 10 and a cover plate 20 .

[0055] Specifically, if Figure 6-Figure 9 As shown, the pallet 10 includes a pallet 10 body and at least one first pallet beam 11, one side of the pallet 10 body is open, the first pallet beam 11 is arranged in the pallet 10 body and divides the interior of the pallet 10 body into a plurality of accommodating spaces 13; a cover plate 20 is arranged on the open side of the pallet 10, at least one matching groove 21 is formed on the cover plate 20 and one of the first pallet beams 11, at least one matching protrusion 22 is provided on the cover plate 20 and the other of the first pallet beams 11, and the matching protrusion 22 is sealed with the matching groove 21 to separate the plurality of accommodating spaces 13.

[0056] The first pallet beam 11 divides the inner space of the pallet 10 into a plurality of accommodating spaces 13. The first pallet beam 11 and the cover plate 20 are matched with each other through matching grooves 21 and matching protrusions 22. After the cover plate 20 is installed, the plurality of accommodating spaces 13 are independent of each other and are not connected to each other.

[0057] According to the shell 2 for the battery pack 1 of the embodiment of the utility model, by setting a matching groove 21 on one of the cover plate 20 and the first pallet beam 11, and setting a matching protrusion 22 on the other, the matching manner of the matching groove 21 and the matching protrusion 22 can simplify the installation structure, improve the reliability of the installation of the cover plate 20 and the first pallet beam 11, and the matching manner of the matching protrusion 22 and the matching groove 21 can increase the path of smoke transfer during thermal runaway, reduce the possibility of heat transfer between different accommodating spaces 13, effectively reduce the efficiency of heat transfer during thermal runaway, and increase the safety of the battery pack 1.

[0058] In some embodiments, Figure 7 and Fig. 9 As shown, a mating protrusion 22 is provided on the surface of the cover plate 20 facing the pallet 10, and a mating groove 21 is formed on the surface of the first pallet beam 11 facing the cover plate 20; or a mating groove 21 is formed on the surface of the cover plate 20 facing the pallet 10, and a mating protrusion 22 is provided on the surface of the first pallet beam 11 facing the cover plate 20. Alternatively, the mating protrusion 22 and the mating groove 21 are provided on the side of the cover plate 20 facing the first pallet beam 11, and the mating protrusion 22 and the mating groove 21 are provided on the side of the first pallet beam 11 facing the cover plate 20.

[0059] Among them, the mating protrusion 22 of the cover plate 20 is opposite to the mating groove 21 of the first pallet beam 11, and the mating groove 21 of the cover plate 20 is opposite to the mating protrusion 22 of the first pallet beam 11. Therefore, the positions of the mating protrusion 22 and the mating groove 21 can be selected according to the actual use and installation scenario. In this embodiment, there are two embodiments, namely, the mating groove 21 is set on the cover plate 20 and the mating protrusion 22 is set on the first pallet beam 11, and the mating protrusion 22 is set on the cover plate 20 and the mating groove 21 is set on the first pallet beam 11.

[0060] In some embodiments, there are multiple mating protrusions 22 and multiple mating grooves 21, and the multiple mating protrusions 22 and multiple mating grooves 21 extend along the length direction of the first pallet beam 11, and the multiple mating protrusions 22 and multiple mating grooves 21 are arranged along the width direction of the first pallet beam 11. That is, the number of mating grooves 21 and mating protrusions 22 is not specifically limited here, and can be multiple, multiple mating protrusions 22 extend along the length direction of the first pallet beam 11 and adapt to the corresponding mating grooves 21, or are arranged at intervals along the width direction of the first pallet beam 11, and multiple mating protrusions 22 are mated with multiple mating grooves 21 respectively.

[0061] Alternatively, if Figure 7 As shown, the housing 2 for the battery pack 1 further includes: a first seal 30, which is arranged between the mating protrusion 22 and the inner wall of the mating groove 21. That is, the first seal 30 is arranged between the mating protrusion 22 and the mating groove 21, and the first seal 30 can have the functions of sealing and bonding after the mating protrusion 22 and the mating groove 21 are mated. The arrangement of the first seal 30 combined with the arrangement structure of the mating protrusion 22 and the mating groove 21 can increase the bonding area of ​​the first seal 30 and improve the strength of the mating between the mating protrusion 22 and the mating groove 21.

[0062] In some embodiments, the first sealing member 30 is a sealant. The sealant can be applied to the side of the mating groove 21 facing the mating protrusion 22 or the side of the mating protrusion 22 facing the mating groove 21, so as to achieve bonding and sealing while reducing the space occupied between the mating groove 21 and the mating protrusion 22, which helps to make the battery pack 1 thinner and lighter.

[0063] In some embodiments, Figure 5 As shown, the housing 2 for the battery pack 1 further includes: at least one second pallet beam 12, at least one reinforcing structure 14, the second pallet beam 12 is arranged in the body of the pallet 10, the second pallet beam 12 is arranged crosswise with the first pallet beam 11, at least one cavity 121 is formed in the second pallet beam 12, and the reinforcing structure 14 is arranged in the cavity 121. The first pallet beam 11 and the second pallet beam 12 intersect in the body of the pallet 10. In this embodiment, the first pallet beam 11 and the second pallet beam 12 are preferably arranged vertically, the first pallet beam 11 extends along the width direction of the body of the pallet 10, and the second pallet beam 12 extends along the length direction of the body of the pallet 10. In this embodiment, the first pallet beam 11 and the second pallet beam 12 divide the space in the pallet 10 into four accommodating spaces 13.

[0064] Among them, a cavity 121 is formed in the second pallet beam 12 along the length direction of the pallet 10 body and penetrates the second pallet beam 12. A reinforcing structure 14 is arranged in the cavity 121. The reinforcing structure 14 can be assembled with the second pallet beam 12 by bonding, bolting, or interference fit. Therefore, the reinforcing structure 14 is arranged in the second pallet beam 12, which can increase the structural strength of the second pallet beam 12, so that the internal structure position of the battery pack 1 can be kept relatively unchanged when thermal runaway occurs, reducing the risk of arcing and reducing the possibility of heat diffusion in different accommodating spaces 13.

[0065] In some embodiments, Figure 5 As shown, at least one cavity 121 constitutes an exhaust channel. Therefore, the exhaust channel can release pressure when the battery module 3 in the local accommodation space 13 experiences thermal runaway, thereby increasing the safety of the battery pack 1.

[0066] Optionally, the reinforcing structure 14 is a hollow structure, and an exhaust passage is formed inside the reinforcing structure 14. That is, the second pallet beam 12 is a hollow structure formed with at least one cavity 121, and a reinforcing structure 14 is provided in at least one of the formed cavities 121, and the reinforcing structure 14 is a hollow structure, so that the reinforcing structure 14 can still serve as an exhaust passage after being assembled with the second pallet beam 12. Therefore, the reinforcing structure 14 is a hollow structure, and the reinforcing structure 14 can be adapted to the shape of the cavity 121, thereby improving the structural strength of the second pallet beam 12, increasing the support for the second pallet beam 12, and not affecting the exhaust pressure relief.

[0067] In addition, the reinforcement structure 14 or the cavity 121 without the reinforcement structure 14 can be filled with a phase change material such as paraffin or hydrogel, which can quickly absorb heat.

[0068] In some embodiments, the reinforcing structure 14 is bonded, bolted, or interference-fitted with the second pallet beam 12. Thus, the reinforcing structure 14 is installed in a simple and convenient manner, with high installation efficiency and low cost.

[0069] In some embodiments, the reinforcement structure 14 is an aluminum part or a steel part. Therefore, the reinforcement structure 14 uses a relatively high-strength material, is not limited to an aluminum part or a steel part, and can be a structural member made of other high-strength materials.

[0070] In some embodiments, the second pallet beam 12 is an insulating member. For example, an insulating member may be disposed outside the second pallet beam 12, and the insulating member may be an insulating coating, such as epoxy or ceramic coating.

[0071] According to the battery pack 1 of the second embodiment of the utility model, Figure 1 and Figure 2 As shown, the battery pack 1 includes: a shell 2 and a plurality of battery modules 3. The shell 2 is the shell 2 for the battery pack 1 in any one of the above embodiments; the plurality of battery modules 3 are respectively arranged in a plurality of accommodating spaces 13 of the tray 10 of the shell 2.

[0072] According to the battery pack 1 of the embodiment of the utility model, a plurality of accommodating spaces 13 are arranged in the battery pack 1, a battery module 3 is arranged in each accommodating space 13, and the plurality of battery modules 3 are connected. The structural design of the outer shell 2 can avoid the influence of one battery module 3 on another battery module 3 when thermal runaway occurs, reduce the possibility of thermal runaway spreading among the plurality of battery modules 3, and increase the safety of the battery pack 1.

[0073] In some embodiments, the battery modules 3 in two adjacent accommodating spaces 13 are electrically connected via a connecting sheet assembly 4 .

[0074] In some embodiments, Figure 3 and Figure 4 As shown, the connecting piece assembly 4 includes: a mounting bracket 41, a connecting piece device 42, and a potting glue 43. The mounting bracket 41 is arranged in the housing 2, and the mounting bracket 41 is located between the battery modules 3 in two adjacent accommodating spaces 13; the connecting piece device 42 is arranged on the mounting bracket 41, and the battery modules 3 in two adjacent accommodating spaces 13 are electrically connected through the connecting piece device 42; the potting glue 43 is filled between the mounting bracket 41 and the connecting piece device 42. The connecting piece assembly 4 is connected to the first pallet beam 11, that is, the connecting piece assembly 4 is arranged between two adjacent battery modules 3 along the length direction of the pallet 10 body.

[0075] The connecting piece device 42 is connected to the mounting bracket 41. After the connecting piece device 42 and the mounting bracket 41 are assembled, the potting glue 43 is filled to block the gap between the connecting piece device 42 and the mounting bracket 41, which can effectively block the free flow of heat in different accommodating spaces 13 of the battery pack 1, prevent the heat from being transferred to other battery modules 3 when the battery cell in a battery module 3 is in thermal runaway, causing a chain reaction, reduce the possibility of thermal runaway of the entire battery pack 1, and avoid the problem of high-voltage short circuit. In addition, the potting glue 43 can be used to cover the exposed part of the connecting piece device 42 to prevent the battery cell from catching fire due to arcing between the battery cell electrolyte vapor and the tray 10 when the battery cell is in thermal runaway.

[0076] In some embodiments, Figure 4 As shown, the connecting piece device 42 includes: a first connecting piece 421, a second connecting piece 422, and a third connecting piece 423. The first connecting piece 421 and the second connecting piece 422 are arranged on the mounting bracket 41 at intervals from each other. The first connecting piece 421 and the second connecting piece 422 are respectively connected to the battery modules 3 in two adjacent accommodating spaces 13. For example, the first connecting piece 421 and the second connecting piece 422 are distributed along the length direction of the tray 10 body, and are respectively connected to two adjacent battery modules 3 to realize the series connection of the two battery modules 3. The third connecting piece 423 is connected between the first connecting piece 421 and the second connecting piece 422. After the connecting piece device 42 is assembled with the mounting bracket 41, the two ends of the third connecting piece 423 are respectively connected to the first connecting piece 421 and the second connecting piece 422 to realize the electrical connection between the first connecting piece 421 and the second connecting piece 422.

[0077] Thus, the first connecting piece 421 and the second connecting piece 422 are electrically connected through the third connecting piece 423, which facilitates the arrangement of the first connecting piece 421 and the second connecting piece 422, simplifies the structure of the connecting piece device 42, and facilitates controlling the connection between the first connecting piece 421 and the second connecting piece 422 by setting the third connecting piece 423, thereby improving the safety of the battery pack 1.

[0078] In some embodiments, Figure 4As shown, one end of the first connecting piece 421 and the second connecting piece 422 are respectively connected to the battery modules 3 in the two adjacent accommodating spaces 13. The mounting bracket 41 includes: a first bracket 411, a second bracket 412, and a third bracket 413. The first bracket 411 is arranged in the housing 2, and a accommodating groove is formed on the first bracket 411. The other ends of the first connecting piece 421 and the second connecting piece 422 are arranged in the accommodating groove at intervals from each other. That is, the first connecting piece 421 and the second connecting piece 422 are respectively connected to the battery modules 3 at the corresponding ends, and the other ends of the first connecting piece 421 and the second connecting piece 422 are bent toward the first bracket 411 to cooperate with the accommodating groove, and the first connecting piece 421 and the second connecting piece 422 are arranged at intervals in the accommodating groove, that is, the first connecting piece 421 and the second connecting piece 422 are not connected.

[0079] At least a portion of the second bracket 412 is matched in the receiving groove and separates the other ends of the first connecting piece 421 and the second connecting piece 422. The third connecting piece 423 is inserted into the second bracket 412, and the two ends of the third connecting piece 423 are respectively connected to the first connecting piece 421 and the second connecting piece 422. That is, the second bracket 412 is matched with the receiving groove of the first bracket 411, and after the first bracket 411 and the second bracket 412 are assembled, the second bracket 412 can achieve the isolation of the other ends of the first connecting piece 421 and the second connecting piece 422.

[0080] However, since the third connecting piece 423 passes through the second bracket 412, the two ends of the third connecting piece 423 are respectively opposite to the first connecting piece 421 and the second connecting piece 422 to achieve electrical connection with the first connecting piece 421 and the second connecting piece 422. The third bracket 413 is arranged on a side of the second bracket 412 away from the first bracket 411, and the potting glue 43 is filled between the first bracket 411 and the third bracket 413.

[0081] Therefore, the provision of the potting glue 43 can prevent the heat in different cavities from flowing between different accommodation spaces 13 through the connecting piece device 42, reduce the chain reaction caused by thermal runaway, and increase the safety of the battery pack 1.

[0082] In some embodiments, the first bracket 411, the second bracket 412 and the third bracket 413 are made of ceramic or bakelite. Ceramics and bakelite have good structural strength and can effectively prevent the battery module 3 from being burned when thermal runaway occurs, and can effectively prevent the insulation failure of the mounting bracket 41. Therefore, the mounting bracket 41 is made of ceramic or bakelite, so that the mounting bracket 41 can still maintain support for the connecting piece device 42 during thermal runaway, and prevent the mounting bracket 41 from being burned and causing insulation failure.

[0083] Furthermore, if Figure 10-12As shown, the connecting plate assembly 4 includes: a fourth connecting plate 424 and a fifth connecting plate 425, and a cutting device 50, one end of the fourth connecting plate 424 and the fifth connecting plate 425 are respectively connected to the battery modules 3 in two adjacent accommodating spaces 13, and the other ends of the fourth connecting plate 424 and the fifth connecting plate 425 are connected to each other.

[0084] That is, in another embodiment of the utility model, two adjacent battery modules 3 are electrically connected through the fourth connecting piece 424 and the fifth connecting piece 425, respectively. And when the battery module 3 does not have thermal runaway, the fourth connecting piece 424 and the fifth connecting piece 425 are connected. The cutting device 50 is arranged in the housing 2. When the voltage of the battery module 3 reaches a preset voltage threshold, or the temperature in the accommodating space 13 reaches a preset temperature threshold, the cutting device 50 cuts off the connection between the other ends of the fourth connecting piece 424 and the fifth connecting piece 425. When thermal runaway occurs in the battery module 3, the cutting device 50 can cut off the end where the fourth connecting piece 424 and the fifth connecting piece 425 are connected to each other, so that when thermal runaway occurs in one of the two adjacent battery modules 3, it can avoid affecting the other battery module 3, avoid thermal runaway of the entire battery pack 1, and can well increase the safety of the use of the battery pack 1 and reduce the use cost of the battery pack 1.

[0085] In addition, in this embodiment, the fourth connecting piece 424 and the fifth connecting piece 425 can be respectively constructed as a part of the first connecting piece 421 and the second connecting piece 422, the third connecting piece 423 is configured to connect the fourth connecting piece 424 and the fifth connecting piece 425, and the cutting device 50 can cut off the connection between the third connecting piece 423 and the fourth connecting piece 424 and the connection between the third connecting piece 423 and the fifth connecting piece 425. That is, the design of the connecting piece device 42, the mounting bracket 41 and the potting glue 43 can increase the structural strength of the connecting piece assembly 4 and avoid the temperature from fluctuating between the multiple battery modules 3 during thermal runaway. At the same time, the connection piece used to connect the two battery modules 3 can be cut off according to the pressure or temperature in the battery pack 1 through the setting of the cutting device 50, thereby further increasing the safety of the battery pack 1.

[0086] In some embodiments, Fig.11As shown, the cutting device 50 includes: a base 51, a shell 52, and a cutter 53. The shell 52 is arranged on the base 51. The shell 52 and the base 51 define a receiving cavity. The other ends of the fourth connecting piece 424 and the fifth connecting piece 425 are located in the receiving cavity and are connected in the receiving cavity. The cutter 53 is movably arranged in the receiving cavity. When the voltage of the battery module 3 reaches a preset voltage threshold, or the temperature in the receiving space 13 reaches a preset temperature threshold, the cutter 53 cuts off the connection between the other ends of the fourth connecting piece 424 and the fifth connecting piece 425. For example, a temperature sensor is provided in the battery pack 1. When the temperature reaches a threshold value, the controller 54 acquires temperature data and controls the cutter 53 to move toward the fourth connecting piece 424 and the fifth connecting piece 425 after analysis, and releases the cutter 53 to cut off the connection between the fourth connecting piece 424 and the fifth connecting piece 425, so as to disconnect the high-voltage connection between the battery modules 3, thereby dividing the high voltage of the battery pack 1 into multiple low-voltage circuits, and avoiding the occurrence of arcing and fire of the positive and negative high voltages of other modules due to the reduction of the insulation distance in the battery pack 1. That is, the fourth connecting piece 424 and the fifth connecting piece 425 are connected in the accommodating cavity, and the cutting device 50 can cut off the connection between the fourth connecting piece 424 and the fifth connecting piece 425 in the event of thermal runaway.

[0087] In some embodiments, in combination Fig.12 The other ends of the fourth connecting piece 424 and the fifth connecting piece 425 are connected by a connecting portion 44, and a cutting area 45 is provided between the connecting portion 44 and the fourth connecting piece 424 and the fifth connecting piece 425, and the cutter 53 is opposite to the cutting area 45. For example, the cutter 53 is circular, the cutter 53 is opposite to the cutting area 45, and the cutter 53 rotates under the action of the controller 54 to cut the cutting area 45. Therefore, the setting of the cutting area 45 can avoid the cutter 53 being opposite to the cutting area 45 to cut the cutting area 45, and the circular cross-sectional shape of the cutter 53 can reduce the space occupied by the cutter 53 in the housing 52.

[0088] In some embodiments, Fig.12 As shown, the thickness of the cut-off area 45 along the moving direction of the cutter 53 is less than the thickness of the fourth connecting piece 424 along the moving direction of the cutter 53, the thickness of the cut-off area 45 along the moving direction of the cutter 53 is less than the thickness of the fifth connecting piece 425 along the moving direction of the cutter 53, and the thickness of the cut-off area 45 along the moving direction of the cutter 53 is less than the thickness of the connecting portion 44 along the moving direction of the cutter 53. Therefore, the thinner design of the cut-off area 45 can meet the normal overcurrent requirements between the battery modules 3 in the battery pack 1, and at the same time facilitates the cutter 53 to quickly cut it off, ensuring the disconnection of the fourth connecting piece 424 and the fifth connecting piece 425.

[0089] In some embodiments, the cutter 53 is a non-metallic part, thereby preventing the cutter 53 from creating a passage and increasing the risk of the battery pack 1 .

[0090] In some embodiments, Fig.13 As shown, the connecting plate assembly 4 includes: a sixth connecting plate 461, a seventh connecting plate 462 and an eighth connecting plate 463, one end of the sixth connecting plate 461 and the seventh connecting plate 462 are respectively connected to the battery modules 3 in two adjacent accommodating spaces 13; the two ends of the eighth connecting plate 463 are respectively connected to the other ends of the sixth connecting plate 461 and the seventh connecting plate 462, and the melting point of the eighth connecting plate 463 is less than or equal to the melting point of any one of the sixth connecting plate 461 and the seventh connecting plate 462.

[0091] For example, a temperature sensor is provided in the battery pack 1. When the temperature reaches a threshold value, the eighth connecting piece 463 will disconnect from the sixth connecting piece 461 or the seventh connecting piece 462 because the melting point of the eighth connecting piece 463 is lower than the melting point of the sixth connecting piece 461 or the seventh connecting piece 462. Optionally, the melting point of the eighth connecting piece 463 is lower than the melting points of the sixth connecting piece 461 and the seventh connecting piece 462, so that the high-voltage connection between the battery modules 3 is disconnected, so that the high voltage of the battery pack 1 is divided into multiple low-voltage circuits, and the phenomenon of arcing and ignition of the positive and negative high voltages of other modules caused by the reduction of the insulation distance in the battery pack 1 is avoided. That is, when the temperature in the battery pack 1 reaches a predetermined threshold value, the eighth connecting piece 463 can disconnect the connection between the sixth connecting piece 461 and the seventh connecting piece 462. As a result, the structure of the connecting piece assembly 4 is simple and the cost is low.

[0092] In some embodiments, the thickness of the eighth connecting piece 463 is less than or equal to the thickness of any one of the sixth connecting piece 461 and the seventh connecting piece 462. For example, the thickness of the eighth connecting piece 463 is thinner than the thickness of the sixth connecting piece 461 or the seventh connecting piece 462, which can improve the efficiency of the eighth connecting piece 463 fusing, and further increase the safety of the battery pack 1.

[0093] Optionally, two adjacent battery modules 3 are connected to a high-voltage voltage divider through a connecting piece, and the high-voltage voltage divider is connected to the distribution box through a wiring harness. When a short circuit occurs in the battery pack 1, the distribution box detects that the current in the battery pack 1 is too large, and the high-voltage voltage divider can be disconnected to divide the high voltage of the battery pack 1 into two low-voltage circuits, thereby reducing the risk of high-voltage arcing. The device includes but is not limited to an intelligent fuse, a circuit breaker or a voltage divider relay. There can be one or more high-voltage voltage dividers placed between the modules.

[0094] The electrical equipment according to the embodiment of the third aspect of the utility model comprises the battery pack 1 of any one of the above embodiments.

[0095] According to the electrical equipment of the embodiment of the utility model, by filling the connecting piece assembly 4 for connecting different battery modules 3 in the battery pack 1 with potting glue 43 and providing a cutting device 50, the battery pack 1 can effectively transfer heat between different battery modules 3 when thermal runaway occurs, thereby reducing the possibility of fire in the battery pack 1 and improving the safety of the electrical equipment.

[0096] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0097] In the description of the present utility model, "first feature" and "second feature" may include one or more of the features. In the description of the present utility model, "plurality" means two or more. In the description of the present utility model, the first feature "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact not directly but through another feature between them. In the description of the present utility model, the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.

[0098] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0099] 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 spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A shell for a battery pack, characterized in that: include: A pallet, the pallet comprising a pallet body and at least one first pallet beam, one side of the pallet body is open, the first pallet beam is arranged in the pallet body and divides the interior of the pallet body into a plurality of accommodating spaces; A cover plate, wherein the cover plate is arranged on the one side of the pallet, and at least one matching groove is formed on the cover plate and one of the first pallet beams, and at least one matching protrusion is provided on the cover plate and the other of the first pallet beams, and the matching protrusion is sealed and matched with the matching groove to separate the multiple accommodating spaces.

2. The housing for a battery pack according to claim 1, characterized in that: The mating protrusion is provided on a surface of the cover plate facing the pallet, and the mating groove is formed on a surface of the first pallet beam facing the cover plate; and / or The matching groove is formed on a surface of the cover plate facing the pallet, and the matching protrusion is provided on a surface of the first pallet beam facing the cover plate.

3. The housing for a battery pack according to claim 1, characterized in that: There are multiple mating protrusions and multiple mating grooves, each of which extends along the length direction of the first pallet beam, and is arranged along the width direction of the first pallet beam.

4. The housing for a battery pack according to claim 1, characterized in that: Also includes: A first sealing member is disposed between the matching protrusion and an inner wall of the matching groove.

5. The housing for a battery pack according to claim 4, characterized in that: The first sealing member is a sealant.

6. The housing for a battery pack according to any one of claims 1 to 5, characterized in that: Also includes: at least one second pallet beam, the second pallet beam being disposed in the pallet body, the second pallet beam being disposed crosswise with the first pallet beam, and at least one cavity being formed in the second pallet beam; At least one reinforcement structure is disposed within the cavity.

7. The housing for a battery pack according to claim 6, characterized in that: At least one of the cavities forms an exhaust passage.

8. The housing for a battery pack according to claim 6, characterized in that: The reinforcement structure is a hollow structure, and an exhaust passage is formed inside the reinforcement structure.

9. The housing for a battery pack according to claim 6, characterized in that: The reinforcement structure is bonded, bolted or interference-fitted to the second pallet beam.

10. The housing for a battery pack according to claim 6, characterized in that: The reinforcement structure is an aluminum part or a steel part.

11. The housing for a battery pack according to claim 6, characterized in that: The second tray beam is an insulating member.

12. A battery pack, characterized in that: include: A shell, wherein the shell is a shell for a battery pack according to any one of claims 1 to 11; A plurality of battery modules are respectively arranged in a plurality of accommodation spaces of the tray of the housing.

13. The battery pack according to claim 12, characterized in that: The battery modules in two adjacent accommodating spaces are electrically connected via a connecting piece assembly.

14. The battery pack according to claim 13, characterized in that: The connecting piece assembly comprises: A mounting bracket, the mounting bracket being disposed in the housing and located between the battery modules in two adjacent accommodating spaces; A connecting piece device, the connecting piece device is arranged on the mounting bracket, and the battery modules in two adjacent accommodating spaces are electrically connected through the connecting piece device; Potting glue, the potting glue is filled between the mounting bracket and the connecting piece device.

15. The battery pack according to claim 14, characterized in that: The connecting piece device comprises: a first connecting piece and a second connecting piece, the first connecting piece and the second connecting piece are arranged on the mounting bracket at a distance from each other, and the first connecting piece and the second connecting piece are respectively connected to the battery modules in two adjacent accommodating spaces; A third connecting piece is connected between the first connecting piece and the second connecting piece.

16. The battery pack according to claim 15, characterized in that: One end of the first connecting piece and one end of the second connecting piece are respectively connected to the battery modules in two adjacent accommodating spaces; The mounting bracket comprises: A first bracket, the first bracket is arranged in the housing, a receiving groove is formed on the first bracket, and the other ends of the first connecting piece and the second connecting piece are arranged in the receiving groove at a distance from each other; a second bracket, at least a portion of which is fitted in the receiving groove and separates the first connecting piece from the other end of the second connecting piece, the third connecting piece is passed through the second bracket, and two ends of the third connecting piece are respectively connected to the first connecting piece and the second connecting piece; The third bracket is arranged on a side of the second bracket away from the first bracket, and the potting glue is filled between the first bracket and the third bracket.

17. The battery pack according to claim 16, characterized in that: The first bracket, the second bracket and the third bracket are made of ceramic or bakelite.

18. The battery pack according to claim 13, characterized in that: The connecting piece assembly comprises: a fourth connecting piece and a fifth connecting piece, wherein one end of the fourth connecting piece and the fifth connecting piece are respectively connected to the battery modules in two adjacent accommodating spaces, and the other ends of the fourth connecting piece and the fifth connecting piece are connected to each other; A cutting device is arranged in the shell, and when the voltage of the battery module reaches a preset voltage threshold, or the temperature in the accommodating space reaches a preset temperature threshold, the cutting device cuts off the connection between the fourth connecting piece and the other end of the fifth connecting piece.

19. The battery pack according to claim 18, characterized in that: The cutting device comprises: Base; A shell, wherein the shell is disposed on the base, the shell and the base define a receiving cavity, and the other ends of the fourth connecting piece and the fifth connecting piece are located in the receiving cavity; A cutter is movably disposed in the accommodating cavity, and when the voltage of the battery module reaches the preset voltage threshold, or the temperature in the accommodating space reaches the preset temperature threshold, the cutter cuts off the connection between the fourth connecting piece and the other end of the fifth connecting piece.

20. The battery pack according to claim 19, characterized in that: The other ends of the fourth connecting piece and the fifth connecting piece are connected via a connecting portion, a cutting area is provided between the connecting portion and the fourth connecting piece and the fifth connecting piece, and the cutting knife is opposite to the cutting area.

21. The battery pack according to claim 20, characterized in that: The thickness of the cutting zone along the moving direction of the cutter is smaller than the thickness of the fourth connecting piece along the moving direction of the cutter, the thickness of the cutting zone along the moving direction of the cutter is smaller than the thickness of the fifth connecting piece along the moving direction of the cutter, and the thickness of the cutting zone along the moving direction of the cutter is smaller than the thickness of the connecting portion along the moving direction of the cutter.

22. The battery pack according to claim 19, characterized in that: The cutter is a non-metallic part.

23. The battery pack according to claim 13, characterized in that: The connecting piece assembly comprises: a sixth connecting piece and a seventh connecting piece, one end of each of which is connected to the battery modules in two adjacent accommodating spaces respectively; An eighth connecting piece, wherein both ends of the eighth connecting piece are respectively connected to the other ends of the sixth connecting piece and the seventh connecting piece, and the melting point of the eighth connecting piece is less than or equal to the melting point of any one of the sixth connecting piece and the seventh connecting piece.

24. The battery pack according to claim 23, characterized in that: The thickness of the eighth connecting piece is less than or equal to the thickness of any one of the sixth connecting piece and the seventh connecting piece.

25. An electrical device, characterized in that: Comprising a battery pack according to any one of claims 12-24.

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