Battery pack shell and battery pack

Abstract

The invention relates to the field of batteries, and discloses a battery pack shell and a battery pack. The battery pack shell comprises a mould pressing upper cover, a main body part and a connecting part, the main body part comprises a wall plate and a containing cavity enclosed by the wall plate, one end of the containing cavity is open, the containing cavity is used for containing a battery monomer, the connecting part is located outside the containing cavity and connected with the wall plate, and the connecting part is arranged around the opening; the reinforcing structure is arranged on the connecting part, the rigidity of the reinforcing structure is greater than that of the connecting part, and the reinforcing structure is arranged on the connecting part, so that the rigidity and the bending strength of the mould pressing upper cover are enhanced, the risk of deformation and torsion of the mould pressing upper cover under the impact of external force is reduced, the structural strength of the battery pack shell is enhanced, and the reliability of the battery pack shell is improved.

Description

Technical Field

[0001] This application belongs to the field of batteries, and particularly relates to a battery pack housing and a battery pack. Background Technology

[0002] With the rapid development of the new energy industry, battery packs, as core energy storage components, are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0003] As users' requirements for battery pack energy density gradually increase, molded battery pack casings are gaining attention due to their lightweight advantages. However, the structural strength of molded battery pack casings is insufficient, and they are easily deformed and damaged under external impact. Therefore, the reliability of molded battery pack casings still needs to be improved. Summary of the Invention

[0004] This application provides a battery pack housing and a battery pack, which can improve the structural strength of the molded top cover and enhance the reliability of the battery pack housing.

[0005] In a first aspect, embodiments of this application provide a battery pack housing, including a molded top cover, a main body and a connecting part. The main body includes a wall panel and a receiving cavity with one end open, which is surrounded by the wall panel. The receiving cavity is used to receive a single battery cell. The connecting part is located outside the receiving cavity and connected to the wall panel. The connecting part is arranged around the opening. A reinforcing structure is disposed on the connecting part, and the stiffness of the reinforcing structure is greater than the stiffness of the connecting part.

[0006] In the embodiments of this application, the battery pack housing includes a molded top cover, which includes a main body and a connecting part. The main body includes a wall panel and a receiving cavity enclosed by the wall panel for accommodating individual battery cells. The connecting part is arranged around the opening and is used to connect with other structures. The battery pack housing also includes a reinforcing structure, the stiffness of which is greater than that of the connecting part. By providing the reinforcing structure in the connecting part, the stiffness and bending strength of the molded top cover are enhanced, the risk of deformation and torsion of the molded top cover under external impact is reduced, the structural strength of the battery pack housing is enhanced, and the reliability of the battery pack housing is improved.

[0007] In some embodiments, the connection includes two mounting sections and two connecting sections that are connected to each other. The two mounting sections are arranged opposite each other along a first direction, and the two connecting sections are arranged opposite each other along a second direction. The first direction and the second direction intersect. The mounting sections are used to connect with an external structure, and a reinforcing structure is provided on the mounting sections.

[0008] In the embodiment of this application, the mounting section of the connecting part is used to connect with the external structure. The mounting section is the main stress-bearing part of the connecting part. By setting the reinforcing structure on the mounting section, the rigidity and bending strength of the mounting section are effectively improved, and the size of the reinforcing structure is reduced, saving the material cost of the battery pack shell.

[0009] In some embodiments, the reinforcing structure extends continuously and is disposed around the opening.

[0010] In the embodiments of this application, the reinforcing structure extends continuously and surrounds the opening to enhance the overall rigidity and bending strength of the connection and improve the reliability of the battery pack casing.

[0011] In some embodiments, the reinforcing structure is disposed inside the connection portion.

[0012] In the embodiment of this application, the reinforcing structure and the connecting part are integrally formed and disposed inside the connecting part. The contact area between the reinforcing structure and the connecting part is large, and the connecting part fully constrains the reinforcing structure, which helps to give full play to the reinforcing effect of the reinforcing structure on the connecting part, enhance the structural strength of the battery pack shell, and improve the reliability of the battery pack shell.

[0013] In some embodiments, the outer surface of the reinforcing structure is provided with at least one groove, at least a portion of the connecting portion is accommodated in the groove, and / or the outer surface of the reinforcing structure is provided with at least one protrusion, at least a portion of the protrusion extends into the connecting portion.

[0014] In the embodiments of this application, grooves and / or protrusions are provided on the outer surface of the reinforcing structure to increase the contact area between the reinforcing structure and the connecting part, thereby improving the connection reliability between the two and reducing the risk of delamination of the reinforcing structure.

[0015] In some embodiments, a reinforcing structure is disposed on at least one side of the connection portion in its thickness direction.

[0016] In the embodiments of this application, the reinforcing structure is bonded to at least one side of the connecting part in its thickness direction to reduce the difficulty of fitting the reinforcing structure and the connecting part together.

[0017] In some embodiments, a reinforcing structure is disposed on the side of the connection portion away from the opening. The reinforcing structure includes a first wall portion, a second wall portion, and a third wall portion that are interconnected. The first wall portion is connected to the connection portion, the second wall portion is connected to the wall panel, one end of the third wall portion is connected to the end of the second wall portion away from the first wall portion, and the other end of the third wall portion extends obliquely to the end of the first wall portion away from the second wall portion.

[0018] In the embodiment of this application, the reinforcing structure includes a first wall portion, a second wall portion, and a third wall portion that are interconnected. The first wall portion is disposed at the connecting portion, the second wall portion is disposed at the wall panel, and the third wall portion, which is inclined and connected to the first wall portion and the second wall portion, provides support for the wall panel and further enhances the structural strength of the battery pack casing.

[0019] In some embodiments, the reinforcing structure further includes a support rib and a cavity enclosed by a first wall portion, a second wall portion, and a third wall portion. The support rib is disposed in the cavity and includes a fixed end and a free end disposed opposite to each other. The fixed end is connected to the third wall portion, and the free end extends obliquely toward the second wall portion and abuts against the middle of the second wall portion.

[0020] In the embodiment of this application, the reinforcing structure further includes a cavity enclosed by a first wall, a second wall, and a third wall. The cavity reduces the weight of the reinforcing structure. The fixed end of the support rib is connected to the third wall, and its free end extends obliquely and abuts against the middle of the second wall. When the external impact force is less than the threshold, the support rib enhances the reinforcing structure's ability to resist external impact. When the external impact is greater than the threshold, the free end slides relative to the second wall, and the reinforcing structure deforms to absorb the external impact, reducing the risk of the main body being damaged by impact and squeezing the internal battery cells, thus improving the reliability of the battery pack casing.

[0021] In some embodiments, the battery pack housing further includes a bottom cover and a fastening structure, the bottom cover being used to seal the opening, and the fastening structure being used to connect the bottom cover and the molded top cover, wherein at least a portion of the fastening structure is embedded in the reinforcing structure.

[0022] In the embodiments of this application, the reinforcing structure has higher strength than the connecting structure. Embedding the fastening structure into the reinforcing structure can effectively reduce the risk of fastening structure pull-out failure and creep relaxation.

[0023] In some embodiments, the battery pack further includes a bottom cover plate for sealing the opening, a reinforcing structure disposed on the side of the connection portion near the opening and surrounding the opening, and a sealing groove disposed on the side of the reinforcing structure opposite to the connection portion for accommodating adhesive for bonding the bottom cover plate and the reinforcing structure.

[0024] In the embodiment of this application, a sealing groove for accommodating the adhesive is provided on the side of the reinforcing structure away from the connecting part, so as to form a reliable sealing and bonding surface between the bottom protective plate and the reinforcing structure.

[0025] In some embodiments, the reinforcing structure includes a thermosetting resin matrix and a filler disposed within the thermosetting resin matrix, the filler including at least one of carbon fiber and glass fiber.

[0026] In the embodiments of this application, the reinforcing structure is a carbon fiber or glass fiber reinforced thermosetting resin composite material with high strength and specific modulus, so that the structural strength of the battery pack shell can be reliably enhanced through the reinforcing structure, thereby improving the reliability of the battery pack shell.

[0027] Secondly, embodiments of this application provide a battery pack, including a battery cell and a battery pack housing as described in the first aspect embodiment, wherein the battery cell is housed within a receiving cavity. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of a battery pack according to an embodiment of this application; Figure 2 This is a schematic diagram of the structure of the molded top cover of the battery pack housing according to an embodiment of this application; Figure 3 This is a schematic diagram of the structure of the molded top cover of the battery pack housing according to another embodiment of this application; Figure 4 This is a schematic diagram of the bottom of the molded top cover of a battery pack housing according to an embodiment of this application; Figure 5 This is a partial structural schematic diagram of a battery pack housing according to an embodiment of this application; Figure 6 This is a schematic diagram of the reinforcing structure of a battery pack housing according to an embodiment of this application; Figure 7 This is a partial structural schematic diagram of a battery pack housing according to an embodiment of this application; Figure 8 This is a partial structural schematic diagram of a battery pack housing according to an embodiment of this application.

[0030] Figure label: 1. Battery pack; 2. Battery cells; 3. Battery pack casing; 31. Molded top cover; 311. Main body; 3111. Opening; 312. Connecting part; 3121. Mounting section; 3122. Connecting section; 32. Reinforcing structure; 321. Groove; 322. Protrusion; 323. First wall portion; 324. Second wall portion; 325. Third wall portion; 326. Chamber; 327. Supporting rib; 328. Sealing groove; 33. Bottom protective plate; 34. Fastening structure; X, the first direction; Y, the second direction. Detailed Implementation

[0031] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0033] Please see Figure 1 , Figure 2 and Figure 3 , Figure 1 This is a schematic diagram of the structure of a battery pack according to an embodiment of this application; Figure 2 This is a partial structural schematic diagram of a battery pack housing according to an embodiment of this application; Figure 3 This is a partial structural schematic diagram of the battery pack housing according to another embodiment of this application.

[0034] Firstly, such as Figures 1 to 3 As shown, this application embodiment provides a battery pack housing 3. The battery pack housing 3 includes a molded top cover 31 and a reinforcing structure 32. The molded top cover 31 includes a main body 311 and a connecting part 312. The main body 311 includes a wall panel and a receiving cavity with an opening 3111 at one end surrounded by the wall panel. The receiving cavity is used to receive a single battery cell 2. The connecting part 312 is located outside the receiving cavity and connected to the wall panel. The connecting part 312 is arranged around the opening 3111. The reinforcing structure 32 is disposed on the connecting part 312. The stiffness of the reinforcing structure 32 is greater than the stiffness of the connecting part 312.

[0035] In the embodiment of this application, the battery pack housing 3 includes a molded top cover 31, which includes a main body 311 and a connecting part 312. The main body 311 includes a wall panel and a receiving cavity enclosed by the wall panel for accommodating the battery cell 2. The connecting part 312 is disposed around the opening 3111 and is used to connect with other structures. The battery pack housing 3 also includes a reinforcing structure 32, the stiffness of which is greater than that of the connecting part 312. By disposing the reinforcing structure 32 on the connecting part 312, the stiffness and bending strength of the molded top cover 31 are enhanced, the risk of deformation and torsion of the molded top cover 31 under external impact is reduced, the structural strength of the battery pack housing 3 is enhanced, and the reliability of the battery pack housing 3 is improved.

[0036] Optionally, the battery pack housing 3 also includes a bottom protective plate 33. When the battery pack housing 3 or the battery pack 1 is in operation, the bottom protective plate 33 is connected to the connecting portion 312 and covers the opening 3111 of the receiving cavity to form a space for accommodating the battery cell 2. The connection between the bottom protective plate 33 and the connecting portion 312 includes a direct connection between the bottom protective plate 33 and the connecting portion 312, or an indirect connection between the bottom protective plate 33 and the connecting portion 312 through a reinforcing structure 32.

[0037] Optionally, the molded cover 31 is made of composite material through a one-time molding process, and the main body 311 and the connecting part 312 are integrally molded, resulting in high connection reliability between the main body 311 and the connecting part 312.

[0038] Optionally, the wall panel includes an end plate and a side plate, which are connected to each other to form a receiving cavity. The end plate and the opening 3111 are disposed opposite to each other. The connecting part 312 is disposed around the opening 3111 and is disposed at the end of the side plate away from the end plate to facilitate the connection between the molded top cover 31 and the bottom guard plate 33.

[0039] Compared to roll-pressed or die-cast housings in related technologies, composite material molded housings have the advantages of being lightweight and highly integrated. However, they also suffer from low structural strength and are prone to deformation and damage. The molded top cover 31 is mainly connected to the bottom guard plate 33 via a connecting part 312. The connecting part 312 primarily bears the force, torque, and vibration of the entire molded housing, making it a stress concentration area. Placing a reinforcing structure 32 at the connecting part 312 effectively disperses stress, improves the rigidity and bending strength of the connecting part 312, and enhances the overall structural strength of the molded top cover 31.

[0040] Optionally, the width of the reinforcing structure 32 is the same as the width of the connecting portion 312, so that the reinforcing structure 32 can enhance the ability of the connecting portion 312 to resist deformation in its width direction.

[0041] For example, the reinforcing structure 32 may be in the shape of a cuboid or a cylinder.

[0042] Optionally, the number of reinforcing structures 32 is one, or the number of reinforcing structures 32 is multiple, and the multiple reinforcing structures 32 are arranged along the width direction of the connecting portion 312.

[0043] In some embodiments, the reinforcing structure 32 includes a thermosetting resin matrix and a filler disposed within the thermosetting resin matrix, the filler including at least one of carbon fiber and glass fiber. The reinforcing structure 32 is a carbon fiber or glass fiber reinforced thermosetting resin composite material, which has high specific strength and specific modulus. The reinforcing structure 32 can reliably enhance the structural strength of the battery pack housing 3 and improve the reliability of the battery pack housing 3.

[0044] For example, the filler of the reinforcing structure 32 includes a mixture of carbon fiber and glass fiber. Carbon fiber is used in the outer layer of the reinforcing structure 32 to obtain better stiffness and surface hardness, while glass fiber is used in the inner layer or core of the reinforcing structure 32 to provide toughness and reduce cost.

[0045] Please see Figure 4 , Figure 4 This is a schematic diagram of the bottom of the molded top cover of a battery pack housing according to an embodiment of this application.

[0046] In some embodiments, such as Figure 2 and Figure 4 As shown, the connecting part 312 includes two mounting sections 3121 and two connecting sections 3122 that are connected to each other. The two mounting sections 3121 are arranged opposite each other along the first direction X, and the two connecting sections 3122 are arranged opposite each other along the second direction Y. The first direction X and the second direction Y intersect. The mounting sections 3121 are used to connect with the external structure, and the reinforcing structure 32 is disposed on the mounting section 3121.

[0047] In these embodiments, the mounting section 3121 of the connecting part 312 is used to connect with the external structure. The mounting section 3121 is the main stress-bearing part of the connecting part 312. By setting the reinforcing structure 32 on the mounting section 3121, the rigidity and bending strength of the mounting section 3121 are effectively improved, and the size of the reinforcing structure 32 is reduced, saving the material cost of the battery pack housing 3.

[0048] For example, in the thickness direction of the connecting portion 312, the orthographic projection of the main body portion 311 is rectangular, with the first direction X being the width direction of the rectangular projection and the second direction Y being the length direction of the rectangular projection. The connecting section 3122 is used to connect with the bottom guard plate 33, and the mounting section 3121 is connected to the bottom guard plate 33 on one side and to the external mounting position on the other side. The mounting section 3121 bears greater stress than the connecting section 3122, so setting the reinforcing structure 32 on the mounting section 3121 can more effectively enhance the structural strength of the battery pack housing 3. For example, for the vehicle battery pack, the mounting section 3121 is fixed to the vehicle chassis by bolts or rivets.

[0049] Optionally, the extension dimension of the reinforcing structure 32 is greater than or equal to the extension dimension of the mounting section 3121 to enhance the structural strength of the mounting section 3121.

[0050] For example, the reinforcing structure 32 covers the entire mounting section 3121 to enhance the structural strength of the mounting section 3121.

[0051] In some embodiments, such as Figure 2 and Figure 4 As shown, the reinforcing structure 32 extends continuously and is arranged around the opening 3111.

[0052] In these embodiments, the reinforcing structure 32 extends continuously and is disposed around the opening 3111 to enhance the overall rigidity and bending strength of the connection 312 and improve the reliability of the battery pack housing 3.

[0053] Specifically, both mounting sections 3121 and both connecting sections 3122 are equipped with reinforcing structures 32 to enhance the overall structural strength of the connecting parts 312.

[0054] Optionally, the four reinforcing structures 32 disposed on the two mounting sections 3121 and the two connecting sections 3122 are fabricated separately to reduce the processing difficulty of the reinforcing structures 32. Alternatively, the four reinforcing structures 32 disposed on the two mounting sections 3121 and the two connecting sections 3122 are integrally formed to enhance the overall structural strength of the reinforcing structures 32.

[0055] Please see Figure 5 , Figure 5 This is a partial structural schematic diagram of a battery pack housing according to an embodiment of this application.

[0056] In some embodiments, such as Figure 2 and Figure 5 As shown, the reinforcing structure 32 is disposed inside the connecting portion 312.

[0057] In these embodiments, the reinforcing structure 32 is integrally formed with the connecting portion 312 and disposed inside the connecting portion 312. The contact area between the reinforcing structure 32 and the connecting portion 312 is large, and the connecting portion 312 fully constrains the reinforcing structure 32, which helps to give full play to the reinforcing effect of the reinforcing structure 32 on the connecting portion 312, enhance the structural strength of the battery pack housing 3, and improve the reliability of the battery pack housing 3.

[0058] For example, the reinforcement structure 32 is disposed inside the connection portion 312, which means that the substrate of the connection portion 312 completely covers the outer surface of the reinforcement structure 32.

[0059] For example, the reinforcing structure 32 is embedded inside the connecting part 312 and then integrally molded. The reinforcing structure 32 and the substrate of the connecting part 312 are firmly bonded to enhance the rigidity and bending strength of the connecting part 312 and improve the structural strength of the molded cover 31.

[0060] Please see Figure 6 , Figure 6 This is a schematic diagram of the reinforcing structure of a battery pack housing according to an embodiment of this application.

[0061] In some embodiments, such as Figure 5 and Figure 6 As shown, the outer surface of the reinforcing structure 32 is provided with at least one groove 321, at least a portion of the connecting portion 312 is accommodated in the groove 321, and / or the outer surface of the reinforcing structure 32 is provided with at least one protrusion 322, at least a portion of the protrusion 322 extends into the connecting portion 312.

[0062] In these embodiments, by providing groove 321 and / or bump 322 structures on the outer surface of the reinforcing structure 32, the contact area between the reinforcing structure 32 and the connecting portion 312 is increased, thereby improving the connection reliability between the two and reducing the risk of delamination of the reinforcing structure 32.

[0063] Optionally, the outer surface of the reinforcing structure 32 is provided with a groove 321, or the outer surface of the reinforcing structure 32 is provided with a protrusion 322, or the outer surface of the reinforcing structure 32 is provided with both a groove 321 and a protrusion 322.

[0064] Optionally, the reinforcing structure 32 is provided with multiple grooves 321, which extend along the length direction of the reinforcing structure 32 and are arranged along the width direction of the reinforcing structure 32; or the multiple grooves 321 extend along the width direction of the reinforcing structure 32 and are arranged along the length direction of the reinforcing structure 32.

[0065] For example, the groove 321 has a rectangular or semi-circular cross-section in its extending direction.

[0066] For example, the bump 322 is in the form of a strip or a dot, etc.

[0067] Optionally, multiple protrusions 322 are arranged in an array along the length and width directions of the reinforcing structure 32, or multiple protrusions 322 extend along the length direction of the reinforcing structure 32 and are arranged along the width direction of the reinforcing structure 32.

[0068] Optionally, the protrusions 322 and the grooves 321 are arranged in sequence to further increase the surface area of ​​the reinforcing structure 32 and increase the contact area between the reinforcing structure 32 and the connecting part 312.

[0069] Please see Figure 7 , Figure 7This is a partial structural schematic diagram of a battery pack housing according to an embodiment of this application.

[0070] In some embodiments, such as Figure 2 , Figure 3 and Figure 7 As shown, the reinforcing structure 32 is disposed on at least one side of the connecting portion 312 in its thickness direction.

[0071] In these embodiments, the reinforcing structure 32 is bonded to at least one side of the connecting portion 312 in its thickness direction to reduce the difficulty of fitting the reinforcing structure 32 and the connecting portion 312.

[0072] Optionally, the connection method between the reinforcing structure 32 and the connecting part 312 can be adhesive bonding, snap-fitting, riveting, or bolting.

[0073] In one example, the reinforcing structure 32 is disposed around the opening 3111 and on the side of the connecting portion 312 close to the opening 3111 in its thickness direction, and / or the reinforcing structure 32 is disposed around the opening 3111 and on the side of the connecting portion 312 away from the opening 3111 in its thickness direction.

[0074] In one example, the reinforcing structure 32 is disposed on the side of the mounting section 3121 near the opening 3111. The thickness of the connecting section 3122 is greater than the thickness of the mounting section 3121. The surface of the connecting section 3122 near the opening 3111 is flush with the surface of the reinforcing structure 32 away from the mounting section 3121, so as to facilitate the connection between the bottom cover 33 and the molded top cover 31.

[0075] Please see Figure 8 , Figure 8 This is a partial structural schematic diagram of a battery pack housing according to an embodiment of this application.

[0076] In some embodiments, such as Figure 2 , Figure 3 and Figure 8 As shown, the reinforcing structure 32 is disposed on the side of the connecting portion 312 away from the opening 3111. The reinforcing structure 32 includes a first wall portion 323, a second wall portion 324 and a third wall portion 325 that are connected to each other. The first wall portion 323 is connected to the connecting portion 312, the second wall portion 324 is connected to the wall panel, one end of the third wall portion 325 is connected to the end of the second wall portion 324 away from the first wall portion 323, and the other end extends obliquely to the end of the first wall portion 323 away from the second wall portion 324.

[0077] In these embodiments, the reinforcing structure 32 includes a first wall portion 323, a second wall portion 324, and a third wall portion 325 that are interconnected. The first wall portion 323 is disposed on the connecting portion 312, the second wall portion 324 is disposed on the wall panel, and the third wall portion 325, which is inclined and connected to the first wall portion 323 and the second wall portion 324, provides support for the wall panel and further enhances the structural strength of the battery pack housing 3.

[0078] Optionally, the reinforcing structure 32 is a solid structure to enhance its structural strength; or the reinforcing structure 32 is a hollow structure, including a cavity 326 enclosed by a first wall portion 323, a second wall portion 324 and a third wall portion 325, which can reduce the weight of the reinforcing structure 32 on the one hand, and allow the reinforcing structure 32 to deform and absorb external impact forces on the other hand.

[0079] Optionally, the first wall portion 323, the second wall portion 324, and the third wall portion 325 are integrally formed to enhance the strength of the reinforcing structure 32; or the first wall portion 323, the second wall portion 324, and the third wall portion 325 are welded together to reduce the processing difficulty of the reinforcing structure 32.

[0080] Optionally, the first wall portion 323 is bonded to the side of the connecting portion 312 away from the opening 3111, and the second wall portion 324 is bonded to the outer surface of the wall panel, thereby increasing the connection area between the reinforcing structure 32 and the molded cover 31 and improving the connection reliability between the two.

[0081] Optionally, one end of the third wall portion 325 is connected to the end of the second wall portion 324 away from the connecting portion 312, and the other end extends along the width direction of the connecting portion 312 and extends obliquely along the thickness direction of the connecting portion 312 to the end of the first wall portion 323 away from the second wall portion 324. The oblique third wall portion 325 can support the first wall portion 323 and the second wall portion 324, as well as support the connecting portion 312 and the main body portion 311.

[0082] For example, the third wall portion 325 may be in the shape of a straight plate or a curved plate. For example, the inclination angle of the third wall portion 325 may be designed according to the actual situation.

[0083] In some embodiments, such as Figure 2 , Figure 3 and Figure 8 As shown, the reinforcing structure 32 also includes a support rib 327 and a cavity 326 enclosed by a first wall portion 323, a second wall portion 324 and a third wall portion 325. The support rib 327 is disposed in the cavity 326. The support rib 327 includes a fixed end and a free end disposed opposite to each other. The fixed end is connected to the third wall portion 325, and the free end extends obliquely toward the second wall portion 324 and abuts against the middle of the second wall portion 324.

[0084] In these embodiments, the reinforcing structure 32 also includes a cavity 326 enclosed by a first wall portion 323, a second wall portion 324, and a third wall portion 325. The cavity 326 reduces the weight of the reinforcing structure 32. The fixed end of the support rib 327 is connected to the third wall portion 325, and its free end extends obliquely and abuts against the middle of the second wall portion 324. When the external impact force is less than the threshold, the support rib 327 enhances the ability of the reinforcing structure 32 to resist external impact. When the external impact is greater than the threshold, the free end slides relative to the second wall portion 324, and the reinforcing structure 32 deforms to absorb the external impact, reducing the risk of the main body 311 being crushed by the impact and damaging the internal battery cells 2, and improving the reliability of the battery pack housing 3.

[0085] Optionally, the support rib 327 and the third wall portion 325 are integrally formed to improve the connection reliability between the support rib 327 and the third wall portion 325; or the support rib 327 is bonded or riveted to the third wall portion 325 to reduce the processing difficulty of the reinforcing structure 32.

[0086] Optionally, the reinforcing structure 32 includes at least two support ribs 327 to enhance the strength of the reinforcing structure 32. The at least two support ribs 327 are spaced apart along the inclined direction of the third wall portion 325; or the at least two support ribs 327 are spaced apart along the extending direction of the reinforcing structure 32.

[0087] Optionally, when the impact force acting on the third wall 325 is less than the threshold, the free end of the support rib 327 abuts against the second wall 324, and the support rib 327 resists the deformation of the third wall 325 to enhance the effect of the reinforcing structure 32 in resisting the external impact force; when the impact force acting on the third wall 325 is greater than or equal to the threshold, the free end of the support rib 327 slides relative to the second wall 324, and the third wall 325 deforms toward the cavity 326 to buffer and absorb the external impact force, reduce the damage to the main body 311, and improve the problem that the main body 311 is prone to thermal runaway of the battery cell 2 when it is squeezed. The specific value of the threshold can be designed according to the actual situation.

[0088] For example, the free end of the support rib 327 abuts against the middle of the second wall portion 324, which means that the support rib 327 abuts against other areas of the second wall portion 324 except for the edge area.

[0089] In some embodiments, such as Figure 1 and Figure 2 As shown, the battery pack housing 3 also includes a bottom protective plate 33 and a fastening structure 34. The bottom protective plate 33 is used to seal the opening 3111, and the fastening structure 34 is used to connect the bottom protective plate 33 and the molded top cover 31. At least part of the fastening structure 34 is embedded in the reinforcing structure 32.

[0090] In these embodiments, the reinforcing structure 32 has higher structural strength than the connecting part 312. Embedding the fastening structure 34 into the reinforcing structure 32 can effectively reduce the risk of pull-out failure and creep relaxation of the fastening structure 34.

[0091] For example, the fastening structure 34 includes a bolt and a nut or the fastening structure 34 includes a bolt and a threaded sleeve. The bottom guard plate 33 has a first through hole. The nut or threaded sleeve is embedded in the reinforcing structure 32. When the reinforcing structure 32 is located in the connecting part 312 or on the side of the connecting part 312 away from the bottom guard plate 33, the connecting part 312 has a second through hole. The bolt is connected through the first through hole, the second through hole and the nut or threaded sleeve embedded in the reinforcing structure 32.

[0092] For example, the reinforcing structure 32 includes a first wall portion 323, a second wall portion 324 and a third wall portion 325 that are interconnected. The first wall portion 323 is connected to the connecting portion 312, the second wall portion 324 is connected to the wall panel, and the fastening structure 34 is embedded in the first wall portion 323 to reduce the design difficulty of the fastening structure 34.

[0093] In some embodiments, such as Figures 1 to 4 As shown, the battery pack 1 also includes a bottom protective plate 33, which is used to cover the opening 3111. A reinforcing structure 32 is disposed on the side of the connecting part 312 near the opening 3111 and surrounds the opening 3111. A sealing groove 328 is provided on the side of the reinforcing structure 32 away from the connecting part 312. The sealing groove 328 is used to accommodate the adhesive, which is used to bond the bottom protective plate 33 and the reinforcing structure 32.

[0094] In these embodiments, the reinforcing structure 32 is provided with a sealing groove 328 for accommodating the adhesive on the side opposite to the connecting portion 312, so as to form a reliable sealing adhesive surface between the bottom guard plate 33 and the reinforcing structure 32.

[0095] In one example, the bottom guard plate 33 is embedded in the connecting part 312, and a sealing groove 328 is provided on the side of the connecting part 312 facing the bottom guard plate 33.

[0096] Optionally, the sealing groove 328 is arranged around the opening 3111 to form a continuous sealing interface, thereby improving the sealing performance of the battery pack housing 3.

[0097] Optionally, there may be multiple sealing grooves 328, which are arranged in sequence to form a reliable sealing interface between the molded upper cover 31 and the bottom cover 33.

[0098] In one example, during the battery pack 1 assembly process, an adhesive is first applied to the sealing groove 328, followed by bonding the molded top cover 31 and the bottom cover 33; finally, the assembly is completed by fastening the molded top cover 31 and the bottom cover 33 using the fastening structure 34. This simplifies the production steps and reduces the production difficulty.

[0099] Secondly, such as Figure 1 As shown, this application provides a battery pack 1, including a battery cell 2 and a battery pack housing 3 as described in the first aspect embodiment above, wherein the battery cell 2 is accommodated in a receiving cavity.

[0100] The above description is merely a specific implementation of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. A battery pack housing, characterized in that, include: A molded top cover includes a main body and a connecting part. The main body includes a wall panel and a receiving cavity with one end open, which is surrounded by the wall panel. The receiving cavity is used to receive a single battery cell. The connecting part is located outside the receiving cavity and connected to the wall panel. The connecting part is arranged around the opening. A reinforcing structure is provided at the connecting part, and the stiffness of the reinforcing structure is greater than that of the connecting part.

2. The battery pack housing according to claim 1, characterized in that, The connection part includes two mounting sections and two connecting sections that are connected to each other. The two mounting sections are arranged opposite each other along a first direction, and the two connecting sections are arranged opposite each other along a second direction. The first direction and the second direction intersect. The mounting sections are used to connect with external structures, and the reinforcing structure is disposed on the mounting sections.

3. The battery pack housing according to claim 2, characterized in that, The reinforcing structure extends continuously and is arranged around the opening.

4. The battery pack housing according to claim 1, characterized in that, The reinforcing structure is disposed inside the connection portion.

5. The battery pack housing according to claim 4, characterized in that, The outer surface of the reinforcing structure is provided with at least one groove, at least a portion of the connecting portion is accommodated in the groove, and / or the outer surface of the reinforcing structure is provided with at least one protrusion, at least a portion of the protrusion extends into the connecting portion.

6. The battery pack housing according to claim 1, characterized in that, The reinforcing structure is bonded to at least one side of the connection in its thickness direction.

7. The battery pack housing according to claim 6, characterized in that, The reinforcing structure is disposed on the side of the connecting portion away from the opening. The reinforcing structure includes a first wall portion, a second wall portion, and a third wall portion that are connected to each other. The first wall portion is connected to the connecting portion, the second wall portion is connected to the wall panel, one end of the third wall portion is connected to the end of the second wall portion away from the first wall portion, and the other end of the third wall portion extends obliquely to the end of the first wall portion away from the second wall portion.

8. The battery pack housing according to claim 7, characterized in that, The reinforcing structure further includes a support rib and a cavity enclosed by the first wall portion, the second wall portion, and the third wall portion. The support rib is disposed in the cavity and includes a fixed end and a free end disposed opposite to each other. The fixed end is connected to the third wall portion, and the free end extends obliquely toward the second wall portion and abuts against the middle of the second wall portion.

9. The battery pack housing according to claim 1, characterized in that, The battery pack housing also includes a bottom protective plate and a fastening structure. The bottom protective plate is used to cover the opening, and the fastening structure is used to connect the bottom protective plate and the molded top cover. At least a portion of the fastening structure is embedded in the reinforcing structure.

10. The battery pack housing according to claim 1, characterized in that, The battery pack also includes a bottom protective plate for sealing the opening. The reinforcing structure is disposed on the side of the connecting portion near the opening and surrounds the opening. A sealing groove is provided on the side of the reinforcing structure away from the connecting portion. The sealing groove is used to accommodate adhesive and the adhesive is used to bond the bottom protective plate and the reinforcing structure.

11. The battery pack housing according to claim 1, characterized in that, The reinforcing structure includes a thermosetting resin matrix and a filler disposed within the thermosetting resin matrix, the filler including at least one of carbon fiber and glass fiber.

12. A battery pack, characterized in that, It includes a battery cell and a battery pack housing as described in any one of claims 1-11, wherein the battery cell is housed within the housing cavity.

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