Battery pack box and battery pack

Abstract

The embodiment of the utility model discloses a kind of battery pack box and battery pack, battery pack box includes: insulating beam, bottom bonding fixed in the bottom of battery pack box;Step hole, set in the inside of insulating beam, and along the height direction of insulating beam through;First connecting piece, including head and stem, the diameter of head is greater than the diameter of stem, first connecting piece is contained in step hole, and stem extends the bottom of insulating beam and is fixed in the bottom of battery pack box.The whole beam structure of the utility model can be conveniently installed and disassembled, provides the convenience for the maintenance of battery pack, the replacement of electric core and realizes "thermal power separation";In addition, the "two-layer protection" required by metal beam is eliminated, not only saves the cost of these materials, even if beam body occurs structural failure (such as fracture) in extreme case, itself also cannot become conductor and cause "secondary short-circuit damage" to electric core, greatly improve the safety and reliability of battery pack.

Description

Technical Field

[0001] This utility model relates to the field of battery pack technology, specifically to a battery pack housing and a battery pack. Background Technology

[0002] Currently, the structural beams inside the power battery pack casing are mostly made of aluminum alloy or other metal materials, which are extruded and then welded or screwed into the casing. This type of metal beam, as the main load-bearing and partitioning structure, has the following inherent defects:

[0003] First, because the metal beam itself is conductive, it is highly susceptible to contact with the cell casing or terminals due to scratches during the cell assembly process, leading to a short circuit risk. Therefore, existing technologies require additional insulating materials such as mica paper or ceramic tape to protect the metal beam surface. This not only increases material costs but also introduces additional manufacturing steps, reducing production efficiency.

[0004] Secondly, the metal beams and the housing are generally fixed using welding, resulting in a permanent structural connection. This non-removable design makes later maintenance and battery cell replacement extremely difficult, and also hinders the implementation of advanced thermal management solutions such as "thermal-electric separation".

[0005] Furthermore, the metal beams may fail structurally when the battery pack is subjected to extreme impacts. Once the insulating protective layer on its surface is damaged, the exposed metal beams themselves become a significant conductive threat, easily causing secondary short circuits to surrounding battery cells and leading to serious safety accidents.

[0006] Therefore, there is an urgent need in this field for a new battery pack housing structure that can fundamentally avoid short-circuit risks, simplify the structure, reduce costs, and facilitate disassembly and maintenance. Utility Model Content

[0007] This utility model proposes a battery pack housing and a battery pack to solve the above-mentioned problems.

[0008] In a first aspect, embodiments of this utility model disclose a battery pack housing, comprising:

[0009] The insulating beam is bonded and fixed to the bottom of the battery pack housing.

[0010] Stepped holes are set inside the insulating beam and extend through the height of the insulating beam;

[0011] The first connector includes a head and a rod, the diameter of the head being larger than the diameter of the rod. The first connector is received in a stepped hole, and the rod extends out of the bottom of the insulating beam and is fixed to the bottom of the battery pack housing.

[0012] By adopting the above technical solution, the entire beam structure of the battery pack housing provided by this utility model embodiment can be easily installed and disassembled, which greatly facilitates the maintenance of the battery pack, the replacement of the cells, and the realization of "thermal-electric separation" (structurally managing the cooling circuit and the electrical system independently). In addition, the elimination of the "second layer of protection" (mica paper / ceramic tape) required for metal beams not only saves the cost of these materials, but also ensures that even if the beam fails under extreme conditions (such as fracture), it will not become a conductor and cause "secondary short circuit damage" to the cells, thus greatly improving the safety and reliability of the battery pack.

[0013] According to another specific embodiment of the present invention, a liquid cooling plate is also provided inside the battery pack housing, located between the insulating beam and the bottom plate of the battery pack housing. The liquid cooling plate has a through hole for the rod of the first connector to pass through. The insulating beam is fixedly connected to the liquid cooling plate through the first connector; and / or the insulating beam is bonded to the liquid cooling plate; and / or the liquid cooling plate is riveted to the bottom of the battery pack housing.

[0014] According to another specific embodiment of the present invention, it further includes:

[0015] Multiple mounting holes are spaced apart at the top of the insulating beam along its length.

[0016] Nested nuts are used to secure the device in the mounting holes.

[0017] The top cover of the enclosure has screw holes corresponding to the positions of the nested nuts. The top cover is locked to the insulating beam by bolts and the nested nuts.

[0018] According to another specific embodiment of the present invention, the two ends of the insulating beam are respectively formed with a first connecting part;

[0019] The battery pack enclosure also includes:

[0020] The end connectors are respectively provided at both ends of the insulating beam and fixedly connected to the battery pack housing. The side of the end connector facing the insulating beam has a second connecting part, which is detachably connected to the first connecting part.

[0021] According to another specific embodiment of the present invention, the first connecting part is a protrusion, the width of which is greater than the width of the insulating beam, and the second connecting part is a groove that mates with the protrusion, the groove extending along the height direction of the end connector.

[0022] According to another specific embodiment of this utility model, the slot is filled with sealant.

[0023] According to another specific embodiment of the present invention, a first connecting hole is provided on the end connector; a second connecting hole is provided on the battery pack housing corresponding to the position of the first connecting hole; the end connector is fixedly connected to the battery pack housing by fasteners passing through the first connecting hole and the second connecting hole; and / or the end connector is bonded and fixed to the battery pack housing.

[0024] According to another specific embodiment of the present invention, the battery pack housing contains a battery cell cluster, the battery cell cluster has a terminal post, the two sides of the insulating beam along the length direction are located on one side of the terminal post, and the insulating beam and the battery cell cluster are separated to form an exhaust space.

[0025] According to another specific embodiment of the present invention, an avoidance groove is provided at the bottom of the insulating beam; and / or an overflow groove is formed by an inward recess at the bottom of the insulating beam.

[0026] Secondly, this utility model discloses a battery pack, including the aforementioned battery pack housing.

[0027] By adopting the above technical solution, the entire beam structure of the battery pack provided by this utility model embodiment can be easily installed and disassembled, which greatly facilitates the maintenance of the battery pack, the replacement of the cells, and the realization of "thermal-electric separation" (structurally managing the cooling circuit and the electrical system independently). In addition, the elimination of the "second layer of protection" (mica paper / ceramic tape) required for the metal beam not only saves the cost of these materials, but also ensures that even if the beam fails under extreme conditions (such as fracture), it will not become a conductor and cause "secondary short circuit damage" to the cells, thus greatly improving the safety and reliability of the battery pack. Attached Figure Description

[0028] Figure 1 This diagram shows a top view of the battery pack housing in an embodiment of the present invention.

[0029] Figure 2 This invention illustrates an embodiment of the present invention. Figure 1 Schematic diagram of the sectional view along section AA;

[0030] Figure 3 This invention illustrates an embodiment of the present invention. Figure 2 A magnified view of a portion of the image;

[0031] Figure 4 A three-dimensional structural schematic diagram of the insulating beam in an embodiment of this utility model is shown;

[0032] Figure 5 This invention illustrates an embodiment of the present invention. Figure 4 Schematic diagram of the end structure of the central insulating beam;

[0033] Figure 6 This invention illustrates an embodiment of the present invention. Figure 4 A front view schematic diagram of the central insulating beam;

[0034] Figure 7 This invention illustrates an embodiment of the present invention. Figure 6 Schematic diagram of the cross section along the CC line;

[0035] Figure 8 This invention illustrates an embodiment of the present invention. Figure 6 A magnified view of a portion of point D in the middle;

[0036] Figure 9 This invention illustrates an embodiment of the present invention. Figure 6 A magnified view of a portion of point E in the middle;

[0037] Figure 10 This invention illustrates an embodiment of the present invention. Figure 6 Schematic diagram of the FF section in the middle;

[0038] Figure 11 This diagram shows the bottom structure of the insulating beam in an embodiment of the present invention.

[0039] Figure Labels

[0040] Insulating beam 1; stepped hole 2; first connector 3; liquid cooling plate 4; nested nut 5; bolt 51; first connecting part 6; end connector 7; fastener 8; base plate 9; box cover 10; cavity 11; battery cell cluster 12; pole post 121; clearance groove 13; glue overflow groove 14. Detailed Implementation

[0041] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0042] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0043] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0044] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0045] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0046] Firstly, reference Figure 1 , Figure 2 , Figure 3 or Figure 6 , Figure 7 , Figure 8 As shown, an embodiment of this utility model discloses a battery pack housing, including: an insulating beam 1, a stepped hole 2, and a first connecting member 3. The bottom of the insulating beam 1 is bonded and fixed to the bottom of the battery pack housing. The stepped hole 2 is disposed inside the insulating beam 1 and extends through the insulating beam 1 along its height direction. The first connecting member 3 includes a head and a rod, the diameter of the head being larger than the diameter of the rod. The first connecting member 3 is accommodated in the stepped hole 2, and the rod extends out of the bottom of the insulating beam 1 and is fixed to the bottom of the battery pack housing.

[0047] Through the above-described method, the battery pack housing provided by this utility model replaces traditional welding by bonding it to the first connecting member 3, making the entire beam structure easy to install and disassemble. This greatly facilitates battery pack maintenance, cell replacement, and the realization of "thermal-electric separation" (structurally managing the cooling circuit and electrical system independently), which is impossible with welding. Furthermore, the first connecting member 3 is housed inside the insulating beam 1, so even in the event of a collision, it will not detach and intrude into the cell, reducing the risk of short circuits. Finally, since the insulating beam 1 itself is non-conductive, even if the cell casing or housing scrapes against the beam during assembly, no short-circuit sparks will be generated. This eliminates the need for the "second layer of protection" (mica paper / ceramic tape) required for metal beams, saving on material costs. Even if the beam fails under extreme conditions (such as fracture), it will not become a conductor and cause "secondary short-circuit damage" to the cell, greatly improving the safety and reliability of the battery pack.

[0048] It should be noted that the bottom of the battery pack housing described in this embodiment refers to the position inside the battery pack housing near the bottom plate 9 of the battery pack housing.

[0049] In the above embodiments, continue to refer to Figure 3 The battery pack housing is also equipped with a liquid cooling plate 4, located between the insulating beam 1 and the bottom plate 9 of the battery pack housing. The liquid cooling plate 4 has a through hole for the rod of the first connector 3 to pass through. The insulating beam 1 is fixedly connected to the liquid cooling plate 4 through the first connector 3. Optionally, the insulating beam 1 is bonded to the liquid cooling plate 4. Optionally, the liquid cooling plate 4 is riveted to the bottom of the battery pack housing.

[0050] The above methods firmly connect the insulating beam 1, the liquid cooling plate 4, and the base plate 9 of the battery pack housing into a single unit, enhancing structural rigidity. The liquid cooling plate 4 is easily installed, disassembled, and maintained as an independent module. In the event of a leak in the cooling system, the liquid cooling plate 4 can be removed separately for inspection without disturbing the entire cell cluster 12, greatly simplifying maintenance. The insulating beam 1 and the liquid cooling plate 4 are bonded together with adhesive, providing continuous surface contact, effectively absorbing vibration, dispersing stress, and providing auxiliary sealing and insulation. These multiple methods can be used in parallel to meet different requirements for strength, sealing, and removability.

[0051] In the above embodiments, reference Figure 3 , Figure 4 and Figure 9 As shown, the battery pack housing also includes: multiple mounting holes, multiple nested nuts 5 (the mounting holes and nested nuts 5 are located at the same position; only the nested nuts 5 are labeled in the attached drawings of this embodiment), and a housing cover 10. The multiple mounting holes are along the length direction of the insulating beam 1. Figure 6 The middle (a) direction) is spaced at the top of the insulating beam 1; multiple nested nuts 5 are fixedly installed in the mounting holes respectively; the box cover 10 has screw holes corresponding to the positions of the nested nuts 5, and the box cover 10 is locked to the insulating beam 1 by the cooperation of bolts 51 and nested nuts 5.

[0052] In this embodiment, the enclosure cover 10 and the insulating beam 1 are connected by nested nuts 5 and bolts, achieving quick and reliable installation and sealing of the enclosure cover 10. The nested nuts 5 (such as injection-molded nuts or press-fit nuts) are embedded inside the insulating beam 1, providing robust metal threads and avoiding the problems of easy thread wear and stripping caused by directly tapping on plastic or metal beams. Multiple mounting points are distributed along the length of the insulating beam 1, so that the locking force of the enclosure cover 10 is evenly transmitted to the entire structure of the insulating beam 1, resulting in a better sealing effect.

[0053] In the above embodiments, such as Figure 4 , Figure 5As shown, the insulating beam 1 has a first connecting part 6 formed at both ends; the battery pack box also includes: an end connector 7, which is correspondingly provided at both ends of the insulating beam 1 and fixedly connected to the battery pack box, and the end connector 7 has a second connecting part on the side facing the insulating beam 1, and the second connecting part is detachably connected to the first connecting part 6.

[0054] The above method enables rapid docking and fixation of the insulating beams 1 along the length of the battery pack housing, facilitating the assembly of battery packs of different sizes. Multiple insulating beams 1 are securely connected to the side walls of the battery pack housing via end connectors 7, forming a stable three-dimensional frame structure.

[0055] In the above embodiment, the first connecting part 6 is a protrusion, the width of which is greater than the width of the insulating beam 1. The second connecting part is a groove that mates with the protrusion, extending along the height direction (H direction in the figure) of the end connector 7. In this embodiment, the connection structure of the protrusion and groove is simple, easy to manufacture, and helps save costs. The mating of the groove and protrusion ("T-slot" structure) allows for automatic alignment during installation, simplifying the assembly process. Furthermore, the width of the protrusion being greater than the width of the insulating beam 1 increases the contact area between the insulating beam 1 and the side wall of the battery pack housing, improving the installation stability of the insulating beam 1.

[0056] In the above embodiments, the internal space shape of the slot matches the outer periphery of the protrusion, or there is a small gap between the internal space of the slot and the outer periphery of the protrusion (the position of the slot can be determined according to the position of the protrusion; the slot is not marked separately in this embodiment). Furthermore, the slot is filled with sealant, so that the gap between the card block and the slot is filled with sealant, thereby achieving a firm bond between the card block and the slot, improving the connection stability between the insulating beam 1 and the end connector 7, and also playing a good sealing role, effectively preventing coolant leakage from spreading from the end joint, and also preventing the intrusion of external moisture and dust.

[0057] In the above embodiments, such as Figure 5 , Figure 10 As shown, the end connector 7 has a first connection hole; the battery pack housing has a second connection hole (not shown in the figure) at the position corresponding to the first connection hole. The end connector 7 is fixedly connected to the battery pack housing by fasteners 8 passing through the first connection hole and the second connection hole; optionally, the end connector 7 is bonded to the battery pack housing.

[0058] In this embodiment, fasteners 8 are used to connect the end connector 7 to the side wall of the battery pack housing, enabling the battery pack housing to withstand strong vibrations and impacts without loosening, thus ensuring high reliability. Furthermore, adhesive is used to bond the side wall of the battery pack housing to the end connector 7, improving the overall stability and sealing of the battery pack housing.

[0059] In the above embodiments, reference Figure 3 or Figure 6 As shown, a cavity 11 is formed inside the insulating beam 1, which achieves the lightweighting of the insulating beam 1 while taking into account the structural stability of the insulating beam 1.

[0060] In the above embodiments, such as Figure 3 As shown, the battery pack housing contains a cell cluster 12, which has a terminal post 121. The two sides of the insulating beam 1 along its length are located on one side of the terminal post 121, and the insulating beam 1 and the cell cluster 12 are separated to form an exhaust space.

[0061] In this embodiment, compared to aluminum alloy metal beams which require a certain width to form when used as support beams for the battery pack housing, the insulating beam 1 is easy to manufacture and can meet the beam usage requirements even with a smaller width. This increases the distance between the insulating beam 1 and the cell clusters 12 on both sides, ensuring a suitable electrical safety distance. It provides a pre-set emission channel for the high-temperature, high-pressure gases generated during cell thermal runaway, quickly directing the heat and flames generated by the runaway cell to a pressure relief valve or dedicated exhaust duct, preventing them from spreading to adjacent cells and delaying or preventing heat diffusion. It also effectively reduces the risk of arcing. In the above embodiment, the distance between the insulating beam 1 and the cell clusters 12 is 4-12 mm.

[0062] In the above embodiments, such as Figure 11 As shown, the bottom of the insulating beam 1 is provided with a clearance groove 13; the design of the clearance groove 13 can avoid interference between the bottom of the insulating beam 1 and the protrusions (such as solder joints and rivets) on the liquid cooling plate 4 due to manufacturing tolerances or assembly errors, and ensure that the installation is flat.

[0063] In the above embodiments, continue to refer to Figure 11 The bottom of the insulating beam 1 is recessed inward to form an overflow groove 14. The overflow groove 14 can: during bonding, use the overflow groove 14 to contain the excess glue squeezed out, prevent the glue from overflowing into unintended areas (such as the mounting surface), and ensure a neat appearance and assembly accuracy; at the same time, by observing the glue in the overflow groove 14, it is possible to indirectly determine whether the amount of glue applied is sufficient.

[0064] In this embodiment, compared to the metal beam needing to be assembled before the battery cells are stacked, assembling the metal beam after the battery cells are stacked may cause the metal beam to rub against the battery cell cluster 12. The insulating beam 1 can be installed after or before the battery cells are stacked, which improves the fault tolerance rate.

[0065] Secondly, this utility model discloses a battery pack, including the aforementioned battery pack housing.

[0066] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A battery pack housing, characterized in that, include: The insulating beam is bonded and fixed to the bottom of the battery pack housing. A stepped hole is provided inside the insulating beam and extends through the insulating beam along its height. The first connector includes a head and a rod, the diameter of the head being larger than the diameter of the rod. The first connector is received in the stepped hole, and the rod extends out of the bottom of the insulating beam and is fixed to the bottom of the battery pack housing.

2. The battery pack housing according to claim 1, characterized in that, The battery pack housing is also provided with a liquid cooling plate, located between the insulating beam and the bottom plate of the battery pack housing. The liquid cooling plate has a through hole for the rod portion of the first connector to pass through. The insulating beam is fixedly connected to the liquid cooling plate through the first connector; and / or the insulating beam is bonded to the liquid cooling plate; and / or the liquid cooling plate is riveted to the bottom of the battery pack housing.

3. The battery pack housing according to claim 1, characterized in that, Also includes: Multiple mounting holes are spaced apart on the top of the insulating beam along its length; A nested nut is fixedly installed in the mounting hole; The box cover has screw holes corresponding to the position of the nested nut, and the box cover is locked to the insulating beam by bolts and the nested nut.

4. The battery pack housing according to claim 1, characterized in that, The insulating beam has a first connecting part formed at each end; The battery pack housing also includes: An end connector is provided at both ends of the insulating beam and fixedly connected to the battery pack housing. The side of the end connector facing the insulating beam has a second connecting part, which is detachably connected to the first connecting part.

5. The battery pack housing according to claim 4, characterized in that, The first connecting part is a protrusion, the width of which is greater than the width of the insulating beam. The second connecting part is a slot that mates with the protrusion, and the slot extends along the height direction of the end connector.

6. The battery pack housing according to claim 5, characterized in that, The slot is filled with sealant.

7. The battery pack housing according to claim 5, characterized in that, The end connector has a first connection hole; the battery pack housing has a second connection hole at the position corresponding to the first connection hole; the end connector is fixedly connected to the battery pack housing by fasteners passing through the first connection hole and the second connection hole; and / or the end connector is bonded and fixed to the battery pack housing.

8. The battery pack housing according to claim 1, characterized in that, The battery pack housing contains a cluster of battery cells, each cluster having a terminal post. The insulating beam has two sides along its length located on one side of the terminal post, and the insulating beam is separated from the battery cell cluster to form an exhaust space.

9. The battery pack housing according to claim 1, characterized in that, The bottom of the insulating beam is provided with a clearance groove; and / or the bottom of the insulating beam is recessed inward to form an overflow groove.

10. A battery pack, characterized in that, The battery pack housing includes any one of claims 1 to 9.

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