Battery pack box and battery pack

Abstract

The application discloses a battery pack box body and a battery pack. The battery pack box body comprises a lower box body, a partition beam and a buffer layer. The lower box body is used for accommodating a plurality of single batteries. The partition beam is arranged in the lower box body, and the partition beam is provided with a recessed accommodating groove facing the side wall surface of the single battery. The buffer layer is an elastic structure and is at least partially embedded in the accommodating groove. The height of the buffer layer is not less than the height of the single battery in the battery compartment, and the projection of the single battery on the buffer layer is located in the height range of the buffer layer. The application provides a stable and uniform supporting force for the shell during the expansion of the single battery by arranging the recessed accommodating groove on the partition beam and embedding the buffer layer, reduces the space occupation of the battery pack box body caused by the arrangement of the buffer layer, and provides sufficient setting space for the single battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery pack housing and a battery pack. Background Technology

[0002] Successful assembly of individual cells in the battery pack requires a certain gap between the individual cells and the partition beams. This gap is filled and isolated by potting adhesive. However, if the gap between the individual cells and the partition beams is too large, it will occupy the space of the individual cell equipment in the battery pack and affect the energy density of the battery pack. If the gap is too small, it will make potting difficult and may result in uneven distribution of adhesive in the gap area. When the individual cells expand during use, the supporting force of the adhesive layer varies at different locations, resulting in deformation of the individual cells. Utility Model Content

[0003] In view of this, the purpose of this application is to provide a battery pack housing and a battery pack, so as to provide uniform support for the individual cells when they expand, and to meet the energy density requirements of the battery pack.

[0004] To achieve the above objectives, this application provides the following technical solution:

[0005] A battery pack housing, comprising:

[0006] The lower housing and the partition beam are used to accommodate multiple individual cells. The partition beam is located inside the lower housing and has a recessed accommodating groove on the side wall of the partition beam facing the individual cells.

[0007] The buffer layer is an elastic structure and is at least partially embedded in the receiving groove; the height of the buffer layer is not less than the height of the single cell, and the projection of the single cell on the buffer layer is within the height range of the buffer layer.

[0008] As can be seen from the above technical solutions, one aspect of this disclosure provides a battery pack housing, which mainly includes a lower housing, a partition beam, and a buffer layer. The lower housing is used to accommodate multiple individual batteries, while the partition beam is disposed within the lower housing, positioned on one side or between the multiple individual batteries. Simultaneously, a recessed receiving groove is provided on the side of the partition beam facing the individual battery. The buffer layer is an elastic structure, and at least a portion of the buffer layer is embedded within the receiving groove, typically at least a portion of the buffer layer along its thickness direction, so that the buffer layer faces the individual battery. Based on this, the individual battery facing the buffer layer can be buffered by the buffer layer when it expands. Supported; furthermore, in the direction perpendicular to the bottom wall of the lower housing, the height of the buffer layer is not less than the height of the individual battery cell, and the projection of the individual battery cell onto the buffer layer is within the height range of the buffer layer. Compared to the adhesive layer, the buffer layer has a regular structure and a more uniform thickness, and its elastic structure can provide more stable support force to various areas of the individual battery cell when it expands, reducing the risk of abnormal deformation of the individual battery cell casing. On the other hand, the fact that the buffer layer is at least partially embedded in the receiving groove can reduce the space occupied by the buffer layer on the battery pack housing outside the partition beam, thereby allowing for a larger area for individual battery cells to be installed in the lower housing, thus meeting the energy density requirements of the battery pack. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the battery pack housing assembly structure provided in one embodiment of the present utility model;

[0011] Figure 2 This is a schematic diagram of the lower housing structure provided in an embodiment of the present utility model;

[0012] Figure 3 A schematic diagram of one side structure of the partition beam provided in an embodiment of this utility model;

[0013] Figure 4 A schematic diagram showing the position of the buffer layer relative to a single battery cell when it is in contact with the cell, according to an embodiment of the present invention.

[0014] Figure 5 A schematic diagram of the assembly structure of the separator beam and a single-sided cell provided in an embodiment of the present invention;

[0015] Figure 6A schematic diagram showing the height of the buffer layer relative to a single battery cell in one embodiment of this utility model.

[0016] Figure 7 This is a schematic diagram of the connection structure between the locking member and the partition beam provided in one embodiment of the present utility model;

[0017] Figure 8 This is a schematic diagram of the cross-sectional structure of a partition beam provided in one embodiment of the present invention.

[0018] in:

[0019] 10-Lower casing; 110-Battery compartment; 20-Separation beam; 210-Accommodation slot; 220-Glue injection slot; 30-Buffer layer; 410-Hollow cavity; 420-Reinforcing rib; 50-Upper casing cover; 60-Single battery cell; 70-Locking component. Detailed Implementation

[0020] The core of this application is to disclose a battery pack housing and a battery pack, so as to provide uniform support for the individual cells when they expand, and to meet the energy density requirements of the battery pack.

[0021] To enable those skilled in the art to better understand the present application, embodiments of the present application will be described below with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the utility model described in the claims. Additionally, the complete content of the structures represented in the following embodiments is not limited to those necessary for the solution of the utility model described in the claims.

[0022] like Figure 1 As shown, one aspect of this disclosure provides a battery pack housing. It should be noted that the battery pack housing refers to a closed or semi-closed structure made of materials such as metal and plastic. It provides installation space for battery packs, BMS, cooling systems, electrical connection components, etc., and fixes these components in the battery pack housing through reasonable structural design to ensure that they maintain a relatively stable position during battery pack operation and avoid damage to components or loosening of connections due to vibration, impact, or other factors.

[0023] A battery pack enclosure typically includes an upper cover and a lower enclosure. The lower enclosure includes a bottom plate and side plates that are connected to and surround the bottom plate. The upper cover is connected to the side plates and includes a cover plate that is opposite to the bottom plate. The upper cover and the lower enclosure together enclose a receiving chamber.

[0024] Furthermore, the upper cover is a sealing component used to cover the receiving cavity of the battery pack box, encapsulating the battery pack inside the receiving cavity and isolating it from the outside world to prevent external moisture and dust from affecting the battery module.

[0025] The upper lid and lower body can be made of non-metallic materials, such as any polymer compound used as a raw material for plastic products, i.e., resin. Commonly used resins include polyphenylene sulfide resin (PPS), polyphenylene oxide resin (PPO), and polypropylene resin (PP). Alternatively, composite materials including reinforcing agents and resins can be used; commonly used reinforcing agents include glass fiber, carbon fiber, and graphite fiber. Metallic materials can also be used, such as iron, aluminum, aluminum alloys, iron alloys, and stainless steel. Furthermore, the upper lid can be in various shapes, such as rectangular or circular, depending on the specific requirements.

[0026] The battery pack casing can be cast from materials such as steel plates and aluminum alloys, or made from lightweight materials such as glass fiber reinforced composite materials and carbon fiber reinforced composite materials.

[0027] The battery pack housing can be cylindrical, cuboid, cube, etc.

[0028] like Figure 1 and Figure 2 As shown, in the battery pack housing provided in this embodiment, the battery pack housing includes a lower housing 10, a partition beam 20, and a buffer layer 30. The lower housing 10 is a housing structure for accommodating multiple individual batteries 60, and the partition beam 20 is disposed inside the lower housing 10. The partition beam 20 disposed inside the lower housing 10 is located on one side of the multiple individual batteries 60 or between the multiple individual batteries 60.

[0029] Based on this, a recessed receiving groove 210 is provided on the side of the separator beam 20 facing the individual battery 60 to provide space for the buffer layer 30. Specifically, the buffer layer 30 is an elastic structure, and its purpose is to support and protect the individual battery 60 on the side of the separator beam 20 facing the individual battery 60. In order to avoid uneven stress on the individual battery 60, in this embodiment, the buffer layer 30 needs to fully cover the height of the individual battery 60 so as to support the entire area of ​​the sidewall of the individual battery 60. Specifically, the height of the buffer layer 30 is not less than the height of the individual battery 60. At the same time, the projection of the individual battery 60 on the buffer layer 30 is within the height range of the buffer layer 30, so that all areas of the sidewall of the individual battery 60 can contact the buffer layer 30 and be supported and protected after expansion.

[0030] Compared to adhesive layer structures that are prone to uneven distribution, buffer layer 30 has a regular structure and a more uniform thickness. Its elastic structure can provide more stable support for various areas of the single cell 60 when the single cell 60 expands, reducing the risk of abnormal deformation of the single cell 60 casing.

[0031] Based on the above structure, the receiving groove 210 is a recessed structure provided on the side of the separator beam 20 facing the single cell 60, and the buffer layer 30 is at least partially embedded in the receiving groove 210. Specifically, a portion of the buffer layer 30 along its thickness direction is embedded in the receiving groove 210. It should be noted that even if the buffer layer 30 is partially or completely embedded in the receiving groove 210 in the thickness direction, it can still protect the single cell 60 when it expands because the projection of the single cell 60 on the buffer layer 30 is within the height range of the buffer layer 30. The structure embedded in the receiving groove 210 can reduce the space occupied by the buffer layer 30 in the lower housing 10 outside the separator beam 20, and the lower housing 10 can have a larger space for the single cell 60, thereby meeting the energy density requirements of the battery pack.

[0032] Furthermore, such as Figure 4 As shown, in the battery pack housing provided in this embodiment, the receiving groove 210 provided on the partition beam 20 faces the side with the largest area on the individual battery 60, i.e., the large surface of the battery. It should be noted that the side with the largest area on the individual battery 60 has a more serious risk of expansion during operation. Therefore, the receiving groove 210 is set to face the side with the largest area on the individual battery 60 so that the buffer layer 30 provided in the receiving groove 210 can directly act on the side with the largest area on the individual battery 60 to meet its expansion support and protection function for the individual battery 60.

[0033] In some embodiments of this disclosure, the partition beam 20 in the lower housing 10 has a single battery cell 60 on only one side. Correspondingly, the partition beam 20 has a receiving groove 210 on only one side, and a buffer layer 30 is provided in the receiving groove 210 to meet the expansion protection function of the single battery cell 60 on one side. In other embodiments of this disclosure, the partition beam 20 is provided between multiple single batteries 60. Specifically, the lower housing 10 is divided into at least two independent battery compartments 110 by the partition beam 20, and each battery compartment 110 is provided with several batteries. It should be noted that the battery compartments 110 are set independently so that the single battery cell 60 can be assembled independently in each battery compartment 110, thereby reducing the difficulty of assembly operations, reducing the mutual operation interference between adjacent battery compartments 110, and improving the modularity of the battery pack.

[0034] And such Figure 2 and Figure 3As shown, within the lower housing 10, adjacent battery compartments 110 are separated by a partition beam 20. Since the partition beam 20 is located in the area between two adjacent battery compartments 110, each battery compartment 110 has a row of individual battery cells 60 arranged adjacent to the partition beam 20. On this basis, on the two side walls of the partition beam 20 facing the battery compartment 110, there are respectively provided receiving grooves 210 to provide a buffer layer 30 with an elastic structure, which supports and protects the shell of the individual battery cell 60 when it expands.

[0035] Furthermore, in some embodiments of this disclosure, in order to reduce the risk of movement of the buffer layer 30 relative to the partition beam 20, the bottom of the recessed structure of the buffer layer 30 is fixedly connected to the receiving groove 210, that is, the bottom edge of the buffer layer 30 and the receiving groove 210 facing the battery compartment 110 is fixedly connected, thereby making the buffer layer 30 maintain a stable position in the height direction, and ensuring that the projection of the single battery 60 on the buffer layer 30 is always within the height range of the buffer layer 30, avoiding the buffer layer 30 from slipping due to gravity and being misaligned with the single battery 60, thus affecting its protective effect on the single battery 60.

[0036] Furthermore, along the thickness direction of the buffer layer 30, the elastic structure of the buffer layer 30 includes at least an abutting state, such as... Figure 4 As shown, when the buffer layer 30 is in the contact state, it abuts against the single cell 60 to fill the gap between the single cell 60 and the partition beam 20. At this time, the buffer layer 30 can not only achieve a sealing function, but also directly abut against the single cell 60. When the shell of the single cell 60 deforms, it will compress the buffer layer 30 in the contact state. The buffer layer 30 can also apply an elastic force to the shell of the single cell 60 to achieve buffer protection for the shell of the single cell 60, and make the shell of the single cell 60 expand more evenly to reduce the risk of abnormal deformation.

[0037] Based on the above embodiments, in order to ensure that the buffer layer 30 provides sufficient support and protection for the individual battery cell 60, such as Figure 4As shown, the thickness L1mm of the buffer layer 30 in the contact state ranges from 5mm to 15mm, specifically 5mm, 8mm, 11mm, or 15mm. It should be noted that the buffer layer 30 in the contact state needs to maintain contact with the individual battery 60. If the thickness L1mm of the buffer layer 30 in the contact state is less than 5mm, there is a risk that the buffer layer 30 cannot effectively support the individual battery 60. Furthermore, while the buffer layer 30 provides contact support for the individual battery 60, it can also result in an insufficient gap between the individual battery 60 and the separator beam 20, leading to insufficient expansion space for the individual battery 60 during operation. This can cause the structural expansion of the individual battery 60 to easily contact the separator beam 20, resulting in a risk of damage during the expansion process. Conversely, if L1mm > 15mm, the buffer layer 30 will occupy a large area between the individual battery 60 and the receiving groove 210. An excessively large gap will waste part of the battery compartment 110, preventing the individual battery 60 from densely filling the battery compartment 110 and affecting the energy density of the battery pack. Therefore, the thickness L1mm of the buffer layer 30 in the contact state is limited to 5mm-15mm. This is because it is necessary to balance the supporting effect of the buffer layer 30 on the single cell 60 and the spacing between the separator beam 20 and the single cell 60, while also matching the thickness L2mm of the buffer layer 30 in the first state, so that the buffer layer 30 has sufficient elastic contact capability and deformation space to meet spatial requirements.

[0038] Furthermore, in some embodiments of this disclosure, such as Figure 5 As shown, along the side wall perpendicular to the separator beam 20 towards the single battery cell 60, the groove depth L2mm of the receiving groove 210 ranges from 3mm to 10mm, specifically 3mm, 5mm, 7mm, or 10mm. It should be noted that the groove depth L2mm of the receiving groove 210 is the recess depth of the separator beam 20, which represents the receiving depth that the receiving groove 210 can provide for the buffer layer 30. If L2mm < 3mm, the embedding depth of the buffer layer 30 in the receiving groove 210 is small, and the buffer layer 30 will still occupy a large space in the battery compartment 110, thus affecting the energy density of the battery pack. If L2mm > 10mm, it will cause the separator beam 20 to be too thin in the area where the receiving groove 210 is set, affecting the structural strength of the separator beam 20 and its sealing effect on the two adjacent battery compartments 110.

[0039] Regarding the structure where receiving grooves 210 are provided on both sides of the partition beam 20, in some preferred embodiments, the receiving grooves 210 on both sides of the partition beam 20 are symmetrically arranged on the partition beam 20, and such as Figure 5As shown, the maximum thickness L3mm of the partition beam 20 ranges from 18mm to 30mm, specifically 18mm, 22mm, 26mm, or 30mm. It should be noted that the maximum thickness here refers to the thickest area on the partition beam 20, i.e., the structural thickness of the area on the partition beam 20 without the receiving groove 210. It should also be noted that the partition beam 20 is a structure located inside the lower housing 10. While it isolates adjacent battery compartments 110, it inevitably occupies internal space in the lower housing 10. If the maximum thickness L3mm of the partition beam 20 is greater than 30mm, the partition beam 20 will occupy too much internal space in the lower housing 10, resulting in a reduction in the number of individual battery cells 60 and affecting the energy density of the battery pack. Furthermore, since receiving slots 210 need to be provided on both sides of the partition beam 20, if the maximum thickness L3mm of the partition beam 20 is less than 18mm, the partition beam 20 will be too thin in the area where the receiving slots 210 are provided, thus weakening the structural strength of the partition beam 20 and affecting its support and sealing effect. Therefore, the maximum thickness L3mm of the partition beam 20 is limited to 18mm-30mm to meet its structural strength requirements after the receiving slots 210 are provided, and to reduce its space occupation within the lower housing 10.

[0040] Furthermore, in the battery pack housing provided in the embodiments of this disclosure, the partition beam 20 needs to be fixedly installed inside the lower housing 10 to isolate the adjacent battery compartments 110. In some embodiments, the bottom of the partition beam 20 is fixedly connected to the bottom wall of the lower housing 10 and sealed to prevent external dust and debris from entering the interior of the battery pack housing through the docking area between the partition beam 20 and the lower housing 10.

[0041] Furthermore, since the height of the buffer layer 30 is not less than the height of the individual battery 60, and the projection of the individual battery 60 onto the buffer layer 30 is within the height range of the buffer layer 30, the buffer layer 30 can effectively support and protect the expansion of various areas of the individual battery 60. Therefore, in some embodiments, along the direction perpendicular to the bottom wall of the housing, such as... Figure 6 As shown, and as Figure 6 As shown, the distance L4mm that the buffer layer 30 extends beyond the single cell 60 on one side is limited to 0-5mm, specifically 0, 1mm, 2mm, 3mm, 4mm or 5mm; this is to meet the support requirements of the single cell 60 and reduce the structural redundancy of the buffer layer 30. It should be noted that if the distance L4mm that the buffer layer 30 extends beyond the single cell 60 on one side is greater than 5mm, the buffer layer 30 can meet the support and protection requirements of the single cell 60, but its size in the height direction is too large, which will not only cause material waste, but also generate structural redundancy, resulting in structural accumulation inside the densely arranged battery pack box, affecting the operating space of the single cell 60.

[0042] Based on the above embodiments, along the direction perpendicular to the bottom wall of the box, the ratio of the height of the receiving groove 210 to the height of the partition beam 20 is 0.85-0.96, specifically 0.85, 0.88, 0.91, 0.94 or 0.96. It should be noted that if the ratio of the height of the receiving groove 210 to the height of the partition beam 20 is less than 0.85, the area provided by the receiving groove 210 for the buffer layer 30 is too small, and the buffering effect is poor; while if the ratio of the height of the receiving groove 210 to the height of the partition beam 20 is greater than 0.96, it will result in the receiving groove 210 being opened in most areas of the partition beam 20, thereby affecting the structural strength of the partition beam 20.

[0043] Furthermore, considering that the buffer layer 30 may slide downwards in the vertical direction due to gravity after being placed inside the receiving groove 210, in some embodiments of this disclosure, the bottom of the buffer layer 30 is fitted to the bottom of the receiving groove 210 in a direction perpendicular to the bottom wall of the housing. This allows the bottom of the buffer layer 30 in the vertical direction to be abutted by one side wall of the receiving groove 210 after it is fixed to the receiving groove, thereby reducing the risk of the buffer layer 30 sliding in the vertical direction and improving the stability of the buffer layer 30 in the receiving groove 210, so that it can stably support and protect the single battery 60.

[0044] Furthermore, in the battery pack housing provided in this embodiment, the bottom of the partition beam 20 needs to be sealed and fixedly connected to the bottom wall of the lower housing 10, requiring sufficient connection space to meet the fixed connection requirements. Specifically, as shown... Figure 7 As shown, in some embodiments, the partition beam 20 is configured as a hollow structure, which can both reduce the weight of the partition beam 20 and fix it to the bottom wall of the lower box 10 in the middle area, so that the two side walls of the hollow structure can seal and protect the fixed area. Specifically, the partition beam 20 is a hollow structure, and the interior of the partition beam 20 is provided with reinforcing ribs 420 to improve the overall structural strength of the hollow structure. At the same time, the hollow structure of the partition beam 20 is divided into at least two independent hollow cavities 410 by the reinforcing ribs 420. On this basis, the bottom of the partition beam 20 is secured by a locking member 70. The locking member 70 is fixed to the bottom wall of the lower housing 10, and its end only penetrates into one hollow cavity 410, which is sufficient to meet the fixed connection requirements. The locking member 70 can be equipped with a sealing gasket or other structure to achieve sealing of the connection area. At the same time, the connector that passes through a single hollow cavity 410 will not invade other hollow cavities 410 in the partition beam 20. When a sealing failure occurs at the position of the locking member 70, the hollow cavity 410 into which the locking member 70 penetrates will fail to seal, but the separate sealing cavities can still maintain the sealing effect, so that the partition beam 20 can maintain its sealing and isolation function.

[0045] Based on the above embodiments, the locking member 70 can be a screw or bolt structure. In order to meet the fixed connection requirements of the locking member 70, the bottom width of the partition beam 20 is greater than the maximum outer diameter of the locking member 70. After the locking member 70 is fixedly connected with the partition beam 20, its rigid action area is located within the coverage area of ​​the bottom of the partition beam 20. The partition beam 20 can fully support the fixed action area of ​​the locking member 70, thereby reducing the failure risk of the locking member 70.

[0046] Furthermore, in the battery pack housing provided in this embodiment, the buffer layer 30 is foam, and the elastic modulus E1MPa of the foam ranges from 0.5MPa to 40MPa, specifically 0.5MPa, 10MPa, 20MPa, 30MPa, or 40MPa. It should be noted that E1MPa reflects the elasticity of the foam in the contact state. If E1MPa < 0.5MPa, there is a risk that the foam's supporting force on the individual battery cell 60 is insufficient when in the contact state. The supporting force of the buffer layer 30 on the battery 60 is insufficient, and there is still a risk of abnormal deformation or contact with the side wall of the partition beam 20 during the expansion process. If E1MPa > 40MPa, the deformation capacity of the foam is insufficient. The individual battery 60 can compress the buffer layer 30 in the early stage of expansion, but in the process of further compression of the buffer layer 30, the buffer layer 30 cannot be further compressed by the individual battery 60 due to insufficient deformation capacity. This results in insufficient expansion space for the individual battery 60 within the battery compartment 110, leading to the risk of abnormal bulging. Therefore, the compressive elastic modulus E1MPa of the foam is limited to the range of 0.5MPa-40MPa, so that the buffer layer 30 can provide sufficient support and protection for the individual battery 60 while reserving sufficient expansion space for the individual battery 60.

[0047] Furthermore, such as Figure 1 As shown, the battery pack housing provided in this embodiment also includes an upper cover 50. The partition beam 20 is fixedly connected to the bottom of the lower housing 10 at its bottom, and its top is sealed and fixedly connected to the upper cover 50. It should be noted that, similar to the structure of the lower housing 10, the partition beam 20 can achieve a sealed and fixed connection with the upper cover 50 through a locking or bolt structure, in conjunction with the function of a sealing gasket. In some embodiments, the top of the partition beam 20 is also provided with an injection groove 220. Along the length direction of the partition beam 20, the injection groove 220 covers the projected length of the battery compartment 110. The injection groove 220 can store the adhesive. After the partition beam 20 is connected to the upper cover 50, the sealing and fixing with the upper cover 50 is achieved by injecting adhesive into the injection groove 220.

[0048] It should be further noted that the glue injection groove 220 can be configured as a straight line structure, a wave structure, or a broken line structure.

[0049] It should also be noted that, since the top and bottom of the partition beam 20 need to be sealed and fixed to the corresponding structures, namely the lower box 10 and the upper box cover 50, in order to ensure that the two ends of the partition beam 20 have sufficient sealing and fixing connection areas, in some embodiments of this disclosure, along the direction perpendicular to the bottom wall of the box, the width of the two end areas of the partition beam 20 is greater than the width of its middle area, so that the partition beam 20 is shaped as follows: Figure 8 The "I"-shaped structure shown has better structural rigidity and achieves sealing and fixation with the lower box 10 and the upper box cover 50 through the two ends of the "I"-shaped structure in the vertical direction, thus having a larger sealing connection area. At the same time, the middle recessed area of ​​the "I"-shaped structure forms the structure of the receiving groove 210 to meet the embedding and assembly requirements of the buffer layer 30.

[0050] Furthermore, in another aspect of this disclosure, a battery pack is also provided, which includes a battery pack housing provided in any of the above embodiments, and a battery pack disposed within the battery pack housing. It should be noted that since the battery pack housing has the technical effects provided in any of the above embodiments, the battery pack also has the technical effects provided in any of the above embodiments, and will not be repeated here.

[0051] The terms "first," "second," "left side," and "right side," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units may not be defined in the listed steps or units, but may include steps or units not listed.

[0052] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery pack housing, characterized in that, include: The lower housing (10) and the partition beam (20) are provided. The lower housing (10) is used to accommodate multiple individual batteries (60). The partition beam (20) is disposed inside the lower housing (10), and the partition beam (20) has a recessed accommodating groove (210) on the side wall facing the individual battery (60). A buffer layer (30) is an elastic structure and is at least partially embedded in the receiving groove (210); the height of the buffer layer (30) is not less than the height of the single cell (60), and the projection of the single cell (60) on the buffer layer (30) is within the height range of the buffer layer (30).

2. The battery pack housing as described in claim 1, characterized in that, The partition beam (20) is positioned on one side of the receiving groove (210) facing the largest side of the single cell (60).

3. The battery pack housing as described in claim 1, characterized in that, The partition beam (20) has the single cell (60) on only one side, and the partition beam (20) has the receiving groove (210) on only one side.

4. The battery pack housing as described in claim 1, characterized in that, The lower housing (10) is divided into at least two battery compartments (110) for setting the individual battery (60) by the partition beam (20). The individual battery (60) is set on both sides of the partition beam (20), and the receiving groove (210) is set on both sides of the partition beam (20).

5. The battery pack housing as described in claim 1, characterized in that, The buffer layer (30) is fixed to the recessed bottom of the receiving groove (210), and the buffer layer (30) includes an abutting state that abuts against the side of the single cell (60) along its thickness direction. The thickness L1mm of the buffer layer (30) in the abutting state ranges from 5mm to 15mm.

6. The battery pack housing as described in claim 2, characterized in that, Along the direction perpendicular to the partition beam (20) toward the sidewall of the single cell (60), the depth L2mm of the receiving groove (210) ranges from 3mm to 10mm.

7. The battery pack housing as described in claim 4, characterized in that, The partition beam (20) is symmetrically provided with the receiving groove (210) on both sides facing the battery compartment (110), and the maximum thickness L3mm of the partition beam (20) ranges from 18mm to 30mm.

8. The battery pack housing as described in claim 1, characterized in that, The bottom of the partition beam (20) is sealed and fixedly connected to the bottom wall of the lower box (10).

9. The battery pack housing as described in claim 1, characterized in that, Along the direction perpendicular to the bottom wall of the lower housing (10), the buffer layer (30) extends beyond the single cell (60) by a distance L4mm on one side in the range of 0-5mm.

10. The battery pack housing as described in claim 9, characterized in that, Along the direction perpendicular to the bottom wall of the lower box (10), the ratio of the height of the receiving groove (210) to the height of the partition beam (20) ranges from 0.85 to 0.

96.

11. The battery pack housing as described in claim 10, characterized in that, Along the direction perpendicular to the bottom wall of the lower housing (10), the bottom of the buffer layer (30) is fitted to the bottom of the receiving groove (210).

12. The battery pack housing as described in claim 8, characterized in that, The partition beam (20) is divided into at least two independent hollow cavities (410) by reinforcing ribs (420). The bottom of the partition beam (20) is fixed to the bottom wall of the lower box (10) by locking member (70), and the locking member (70) is inserted into only one of the hollow cavities (410).

13. The battery pack housing as described in claim 12, characterized in that, The bottom width of the partition beam (20) is greater than the maximum outer diameter of the locking member (70).

14. The battery pack housing as described in claim 1, characterized in that, The buffer layer (30) is foam, and the elastic modulus E1MPa of the buffer layer (30) is in the range of 0.5MPa-40MPa.

15. The battery pack housing as described in claim 8, characterized in that, It also includes an upper cover (50), the top of which is sealed and fixedly connected to the upper cover (50) of the partition beam (20).

16. The battery pack housing as described in claim 15, characterized in that, The top of the partition beam (20) is provided with an adhesive injection groove (220) and is sealed with adhesive to the upper box cover (50).

17. The battery pack housing as described in claim 15, characterized in that, Along the direction perpendicular to the bottom wall of the lower box (10), the width of the two end regions of the partition beam (20) is greater than the width of the middle region.

18. A battery pack, characterized in that, Includes the battery pack housing as described in any one of claims 1-17.

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