A battery device

Abstract

The application relates to the battery technical field and provides a battery device to at least solve the problem of high installation difficulty of the battery device. The battery device comprises a box body, a battery assembly, a cross beam and an end plate. At least part of the end plate is located between the cross beam and the battery assembly. The surface of the end plate along the first direction and towards the cross beam is a first guide surface. The first guide surface is inclined along the direction from the bottom surface to the opening and away from the battery assembly. At least part of the end plate is located on the side of the cross beam towards the opening and is connected with the cross beam. When the battery assembly and the end cover are loaded into the box body, the first guide surface decomposes the vertical installation force into a force perpendicular to the inclined surface and a horizontal extrusion force, the horizontal extrusion force keeps the pre-tightening force of the battery assembly and the end cover when loaded into the box body, so that the gap after the tool is removed is eliminated. Therefore, manual glue beating or insulation sheet filling is not needed. The installation difficulty is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery device. Background Technology

[0002] In battery systems, the CTP (Cell-to-Pack) solution involves directly installing multiple battery cells into a battery pack.

[0003] During battery installation, multiple battery cells are clamped together using a tooling fixture, and the pre-tightened battery cells are installed into the battery pack housing. The tooling fixture is then removed, and structural adhesive or insulating sheets are applied to the gap between the battery cells and the housing to meet the pre-tightening requirements after battery cell installation.

[0004] However, the battery devices in the relevant technologies have the problem of high installation difficulty. Utility Model Content

[0005] To address the aforementioned technical problems, this application provides a battery device, thereby at least resolving the issue of high installation difficulty.

[0006] This application provides a battery device including a housing, a battery assembly, a crossbeam, and an end plate. The housing forms an accommodating space with an opening on one side, and includes a bottom surface opposite the opening. The battery assembly is disposed within the accommodating space. The crossbeam is located within the accommodating space and arranged in conjunction with the battery assembly. The arrangement direction of the battery assembly and the crossbeam is a first direction, perpendicular to the direction from the bottom surface to the opening. At least a portion of the end plate is located between the crossbeam and the battery assembly. The surface of the end plate facing the crossbeam along the first direction is a first guide surface. The first guide surface is inclined away from the battery assembly along the direction from the bottom surface to the opening. At least a portion of the end plate is located on the side of the crossbeam facing the opening and is connected to the crossbeam.

[0007] Through the above technical solution, when installing the battery pack into the housing, the end cap and battery pack are first pre-tightened using tooling. When the battery pack and end cap are installed into the housing, the first guide surface decomposes the vertical installation force into a force perpendicular to the inclined plane and a horizontal compressive force. The force perpendicular to the inclined plane is offset by the supporting force, and the horizontal compressive force maintains the pre-tightening force of the battery pack and end cap when installed into the housing, thus eliminating the gap after the tooling is removed. After the end plate is connected to the crossbeam, the position of the end cap is fixed, and the pre-tightening force is still maintained, thus eliminating the need for manual application of adhesive or filling with insulating sheets. This reduces installation difficulty and improves production efficiency.

[0008] In one embodiment, the surface of the crossbeam facing the end plate along a first direction is a second guide surface. The second guide surface is inclined away from the end plate along the direction from the bottom surface to the opening. The second guide surface abuts against the first guide surface.

[0009] In one embodiment, the end plate includes a first portion and a second portion. The first portion is located between the battery assembly and the crossbeam. A first guide surface is located on the first portion. The second portion is located on the side of the first portion facing the opening and extends along a first direction between the crossbeam and the opening, abutting against the crossbeam along its bottom surface towards the opening.

[0010] In one embodiment, the second portion includes a bearing surface facing the crossbeam, the bearing surface being connected to a first guide surface. The crossbeam includes a receiving surface facing the opening, the receiving surface being connected to a second guide surface, and the receiving surface and the bearing surface being disposed opposite each other along the direction from the bottom surface to the opening.

[0011] In one embodiment, the side of the first portion facing the bottom surface includes an abutting surface, which is connected to a first guide surface, and the first portion abuts against the bottom surface through the abutting surface.

[0012] In one embodiment, the battery assembly further includes fasteners. The fasteners pass through the bearing surface and the receiving surface, and connect the second part to the crossbeam.

[0013] In one embodiment, the second part further includes a mounting hole and a countersunk groove. The mounting hole extends through to the bearing surface in the direction from the opening to the bottom surface. The countersunk groove is located on the side of the second part opposite to the crossbeam. The end of the mounting hole away from the bearing surface penetrates the bottom wall of the countersunk groove. Fasteners pass through the countersunk groove and are inserted into the mounting hole.

[0014] In one embodiment, the battery device further includes a support member disposed in the mounting hole and located on the periphery of the support member. The support member extends axially along the mounting hole, and the length of the support member is greater than or equal to the length of the mounting hole.

[0015] In one embodiment, the sum of the thicknesses of the first portion and the crossbeam in the first direction is equal to the thickness of the second portion in the first direction.

[0016] In one embodiment, the battery assembly includes a plurality of battery cells arranged along a first direction and a plurality of insulating members, wherein an insulating member is located between two adjacent battery cells and the insulating member is elastically deformable. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0018] 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, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the battery device according to an embodiment of this application; Figure 2 This is a partial cross-sectional schematic diagram of the battery device according to an embodiment of this application; Figure 3 This is a schematic diagram of the end plate structure according to an embodiment of this application; Figure 4 This is a view of the end plate along a first direction according to an embodiment of this application; Figure 5 This is a schematic diagram of the structure of a portion of the battery device according to an embodiment of this application.

[0020] Explanation of reference numerals in the attached figures: 100. Battery assembly; 1. Housing; 11. Accommodation space; 12. Opening; 13. Bottom surface; 2. Battery assembly; 21. Battery cell; 22. Insulator; 3. Crossbeam; 31. Second guide surface; 32. Receiving surface; 4. End plate; 41. First part; 411. First guide surface; 412. Abutting surface; 42. Second part; 421. Bearing surface; 422. Mounting hole; 423. Slot; 424. Low-voltage insertion hole; 5. Fastener; 6. Support; 7. Low-voltage plug; 8. Terminal post fixing seat; 81. Terminal post cover plate; 9. Flexible acquisition plate. Detailed Implementation

[0021] To better understand the above-mentioned objectives, features, and advantages of this application, the solution of this application will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0022] Many specific details are set forth in the following description in order to provide a full understanding of this application, but this application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of this application, and not all embodiments.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0024] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features.

[0025] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0026] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0027] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0028] The present application will now be described in detail. Before describing the embodiments of the present application, the logic behind the technical problem arising from the present application will be explained first.

[0029] During battery pack installation, multiple battery cells are clamped together using a fixture, and these cells, under preload, are installed into the battery pack housing. At this stage, gaps exist between the battery cells and the housing to facilitate installation. The fixture is then removed, and as it is removed, the preload between the battery cells decreases. To maintain the preload, structural adhesive or insulating sheets are applied to the gaps between the battery cells and the housing to meet the required preload after installation.

[0030] When using insulating sheets as fillers, different thicknesses of insulating sheets are manually selected based on the actual gap size. This method heavily relies on the operator's experience, resulting in low automation and inefficiency. Furthermore, the insulating sheets have discrete thicknesses, while the gaps are continuously varying, making proper matching impossible and leading to errors such as being too tight or too loose.

[0031] When using structural adhesives, the filler volume, flowability, and curing shrinkage rate of the adhesive all affect the preload of the battery cells. Thicker adhesive layers in areas with larger gaps result in greater shrinkage, while thinner layers in areas with smaller gaps result in less shrinkage. This leads to uneven preload. Furthermore, adhesive overflow can occur, harming the health of the battery modules and impacting production efficiency.

[0032] The aforementioned issues make the installation of existing battery modules difficult.

[0033] The embodiments of this application are described below.

[0034] See Figure 1 As shown, in a first aspect, this application provides a battery device 100. The battery device 100 provided by this application can be used in electronic products, vehicles, energy storage devices, power tools, household appliances, portable devices, outdoor equipment, medical devices, etc. Wherein, when the battery is used in a vehicle, the battery device 100 can be used in a vehicle.

[0035] Combination Figure 1 , Figure 2 and Figure 3 As shown. The battery device 100 includes a housing 1, a battery assembly 2, a crossbeam 3, and an end plate 4.

[0036] The housing 1 forms an accommodating space 11 with an opening 12 on one side, and the housing 1 includes a bottom surface 13 opposite to the opening 12. The opening 12 is used for installing or removing components into the accommodating space 11. The bottom surface 13 is used to receive components installed in the accommodating space 11.

[0037] In one possible implementation, the housing 1 includes a frame arranged circumferentially thereon, the frame including a side perpendicular to the opening 12 and the bottom surface 13. The housing 1 also includes a bottom plate connected to the frame, with the bottom surface 13 located on the bottom plate. The connection method between the bottom plate and the frame includes, but is not limited to, bolt connection, snap-fit, plug-in connection, latch connection, magnetic connection, adhesive bonding, welding, or integral molding.

[0038] The housing 1 may also include a top plate, which is used to close the opening 12 and is connected to the housing 1.

[0039] Battery assembly 2 is disposed in accommodating space 11. Battery assembly 2 is at least the sum of a plurality of battery cells 21.

[0040] The crossbeam 3 is located in the accommodating space 11 and is arranged with the battery assembly 2. The arrangement direction of the battery assembly 2 and the crossbeam 3 is a first direction, which is perpendicular to the direction from the bottom surface 13 to the opening 12.

[0041] For example, the beam 3 can be connected to two opposite walls of the frame along its extension direction. Alternatively, the beam 3 can also be connected to the base plate. Or it can be formed by the base plate extending towards the opening 12.

[0042] The first direction is perpendicular to the direction from the bottom surface 13 to the opening 12. That is, the first direction is any direction within the plane containing the opening 12. However, for ease of description and understanding, we will take a rectangular box 1 as an example, and take the length direction of the rectangular box 1 as an example for further explanation.

[0043] At least a portion of the end plate 4 is located between the crossbeam 3 and the battery assembly 2. That is, along the first direction, at least a portion of the end plate 4 is located between the crossbeam 3 and the battery assembly 2.

[0044] The surface of end plate 4 facing the crossbeam 3 along the first direction is the first guide surface 411. That is, the surface of end plate 4 facing away from battery assembly 2 along the first direction is the first guide surface 411. The first guide surface 411 is inclined away from battery assembly 2 along the direction from bottom surface 13 to opening 12. Figure 3 As shown in the figure, the first guide surface 411 tilts to the right from the direction above the bottom in the figure.

[0045] At least a portion of the end plate 4 is located on the side of the crossbeam 3 facing the opening 12 and is connected to the crossbeam 3. When the portion of the end plate 4 on the side of the crossbeam 3 facing the opening 12 is connected to the crossbeam 3, the downward pressure of the top cover is transmitted to the end plate 4 when the top cover is installed, so that the end plate 4 remains connected to the crossbeam 3.

[0046] When the battery assembly 2 is installed in the housing 1, the battery assembly 2 and the end plate 4 are compressed by external tooling and obtain the design preload.

[0047] The compressed unit is then installed into housing 1. The installation direction is from opening 12 to bottom surface 13. During this process, the first guide surface 411 of end plate 4 begins to contact and slide relative to the crossbeam 3. The first guide surface 411 decomposes the vertical installation force into a force perpendicular to the inclined plane and a horizontal compressive force. The force perpendicular to the inclined plane is offset by the supporting force, and the horizontal compressive force maintains the preload of battery assembly 2 and end cap when installed into housing 1, and can also provide additional preload. It should be noted that during installation, the horizontal compressive force is in the same direction as the preload applied by the tooling.

[0048] After the battery assembly 2 and the end plate 4 are installed in the accommodating space 11, the end plate 4 is connected to the crossbeam 3, providing a rigid connection in structure and depriving the end plate 4 of its degree of freedom of movement in the horizontal direction relative to the crossbeam 3.

[0049] Then, after removing the external tooling, the springback force of the battery assembly 2 will attempt to push the end plate 4. However, since the end plate 4 is rigidly connected to the crossbeam 3, this springback force will be directly transmitted to the crossbeam 3 and then to the housing 1. Because the first guide surface 411 provides additional preload during the installation process, the springback of the battery assembly 2 is minimal, meaning that it will not cause the individual battery assembly 2 cells to come out of the receiving space 11.

[0050] See also Figure 2 and Figure 3 As shown. In one embodiment, the battery assembly 2 includes a plurality of battery cells 21 arranged along a first direction and a plurality of insulating members 22, wherein an insulating member 22 is located between two adjacent battery cells 21 and the insulating member 22 is elastically deformable.

[0051] The elastically deformable insulating component 22 can automatically compensate for the thickness tolerances of the battery cells 21 during manufacturing and the shrinkage and expansion that occur during long-term use.

[0052] The battery cell 21 will expand and contract slightly during charge and discharge cycles. The elastic insulation 22 can continuously follow this volume change and dynamically adjust its own compression, thereby maintaining a relatively stable preload throughout the battery life and avoiding preload failure due to the shrinkage of the battery assembly 2.

[0053] During installation, when the battery assembly 2 is subjected to preload, the insulating member 22 undergoes elastic deformation to provide a uniform preload to the battery cells 21. When the first guide surface 411 generates additional horizontal compressive force, this force can be smoothly transmitted to each battery cell 21 due to the presence of the elastic insulating member 22. After the fixture is removed, the insulating member 22 can spring back, automatically filling the gap created by the removal of the fixture, thereby maintaining the clamping force of the battery assembly 2.

[0054] For example, the insulating element 22 may be insulating foam or a rubber pad.

[0055] The battery cell 21 includes, but is not limited to, prismatic hard-shell batteries, cylindrical batteries, pouch batteries, and blade batteries. The embodiments of this application will be further illustrated using a blade battery as an example of the battery cell 21.

[0056] In one embodiment, the side of the end plate 4 facing the battery assembly 2 is flat, which facilitates the installation of the battery cell 21 and the insulator 22.

[0057] See also Figure 2 and Figure 3 As shown. In one embodiment, the surface of the crossbeam 3 along the first direction and facing the end plate 4 is the second guide surface 31.

[0058] In one possible implementation, the second guide surface 31 is composed of Figure 2 Extending from below to above and perpendicular to the first direction, the cross-sectional shape of the beam 3 is rectangular. In other embodiments, the second guide surface 31 can also be an arc surface, formed by... Figure 2 The curve from bottom to top can be an arc surface protruding toward the first guide surface 411 or an arc surface recessed toward the first guide surface 411.

[0059] In one possible implementation, the second guide surface 31 is inclined away from the end plate 4 along the direction from the bottom surface 13 to the opening 12. The second guide surface 31 abuts against the first guide surface 411. Figure 2 As shown in the figure, the second guide surface 31 is tilted to the right from the direction above the bottom in the figure.

[0060] The second guide surface 31 and the first guide surface 411 together form an inclined guide structure. During installation, the engagement of the two inclined surfaces automatically guides the end plate 4 to the designed position. The engagement of the first guide surface 411 and the second guide surface 31 allows the applied force to be smoothly and efficiently transmitted along a direction perpendicular to the contact surface. This reduces the component force in unexpected directions, allowing the vertically downward installation force to be converted into a horizontal preload in the largest possible proportion.

[0061] Simultaneously, the first guide surface 411 and the second guide surface 31 abut against each other, forming a stable and sufficient surface contact between the two complementary inclined surfaces. When the preload is transmitted through this inclined surface, the stress distribution is more uniform.

[0062] For example, the inclination of the second guide surface 31 is the same as that of the first guide surface 411. In this case, the gap between the first guide surface 411 and the second guide surface 31 is reduced, allowing the first guide surface 411 and the second guide surface 31 to fit together tightly. Once the end plate 4 is installed in place, the connection between the end plate 4 and the crossbeam 3 is tighter, resulting in more stable support.

[0063] For example, the second guide surface 31 is the same size as the first guide surface 411, meaning they have the same area and shape. In this case, the load distribution between the first guide surface 411 and the second guide surface 31 is uniform, thus reducing local stress concentration and improving service life. Simultaneously, the fact that the first guide surface 411 and the second guide surface 31 are the same size also reduces the gap between the end plate 4 and the crossbeam 3, thereby improving the tightness of the connection.

[0064] See also Figure 2 and Figure 3As shown. In one embodiment, the end plate 4 includes a first portion 41 and a second portion 42. The first portion 41 is located between the battery assembly 2 and the crossbeam 3. A first guide surface 411 is located in the first portion 41. The second portion 42 is located on the side of the first portion 41 facing the opening 12 and extends along a first direction between the crossbeam 3 and the opening 12. The second portion 42 abuts against the crossbeam 3 along the direction from the bottom surface 13 to the opening 12.

[0065] The first part 41 is located between the battery assembly 2 and the crossbeam 3. The first guide surface 411 on it is responsible for converting the vertical force into the horizontal preload and directly bearing the rebound force from the entire battery assembly 2.

[0066] The second part 42 extends out and abuts against the crossbeam 3 in the vertical direction. Its function is to connect with the crossbeam 3. The vertical abutment of the second part 42 against the crossbeam 3 provides a rigid stop for the entire end plate 4 in the vertical direction.

[0067] When the top plate is installed, the side of the second part 42 facing away from the crossbeam 3 is connected to the top plate. When the top plate is installed on the frame, the second part 42 is limited in the direction from the bottom surface 13 to the opening 12, thereby fixing the battery assembly 2 in this direction, which improves the overall rigidity and stability of the structure.

[0068] When the top plate is installed above the end plate 4, the second part 42 bears and transmits the vertically downward locking force from the top plate of the housing 1. This reduces frictional transmission from the first guide surface 411. It also reduces wear, jamming, or unnecessary lateral displacement of the inclined surface under vertical force, improving the purity and reliability of the preload mechanism.

[0069] When placing the pre-assembled battery pack 2 and end plate 4 into the housing 1, the assembler can rest the bottom of the second part 42 against the crossbeam 3. This provides initial and stable support for the installation of the end plate 4, facilitating subsequent positioning and adjustment, thereby reducing assembly difficulty and enabling automated production.

[0070] The end plate is divided into two parts, Part 41 and Part 42, each with its own function. This functional partitioning solves the problems of force application, positioning, and assembly. This results in more precise preload application, a more stable and reliable structure, better vibration resistance, and simpler assembly.

[0071] See also Figure 2 and Figure 3As shown. In one possible implementation, the second part 42 has multiple cavities. This reduces the overall weight of the second part 42. For example, the structure of the second part 42 with cavities can resemble a harmonica tube structure. When cavities are provided in the second part 42, the wall thickness of the second part 42 must be greater than or equal to 1.5 mm and less than or equal to 3 mm to meet structural strength requirements.

[0072] In one possible implementation, the first part 41 may be provided with multiple cavities.

[0073] See also Figure 2 and Figure 3 As shown. In one embodiment, the second part 42 includes a bearing surface 421 facing the crossbeam 3, and the bearing surface 421 is connected to the first guide surface 411. The crossbeam 3 includes a receiving surface 32 facing the opening 12, and the receiving surface 32 is connected to the second guide surface 31. The receiving surface 32 and the bearing surface 421 are arranged opposite to each other along the direction from the bottom surface 13 to the opening 12.

[0074] When the first guide surface 411 and the second guide surface 31 are in full contact, the abutment surface 412 and the bearing surface 32 are in contact simultaneously, providing a defined and rigid support point for the end plate 4 in the vertical direction.

[0075] The end plate 4 is connected to the second guide surface 31 and the bearing surface 32 of the crossbeam 3 via a first guide surface 411 and a bearing surface 421. Specifically, the first guide surface 411 and the bearing surface 421 are connected and their extension directions intersect, and the second guide surface 31 and the bearing surface 32 are connected and their extension directions intersect. Thus, when both surfaces of the end plate 4 are in contact with both surfaces of the crossbeam 3, a stable connection structure is formed. This increases the structural rigidity of the end plate 4 and the crossbeam 3, improving their resistance to vibration and impact.

[0076] In one embodiment, the side of the first portion 41 facing the bottom surface 13 includes an abutment surface 412, which is connected to the first guide surface 411, and the first portion 41 abuts against the bottom surface 13 through the abutment surface 412.

[0077] The first guide surface 411 includes two opposite ends along the direction from the bottom surface 13 to the opening 12, one end of which is connected to the bearing surface 421 and the other end is connected to the abutment surface 412. The bearing surface 421 is supported by the bearing surface 32, and the abutment surface 412 is supported by the bottom surface 13 of the housing 1.

[0078] The abutting surface 412 abuts against the bottom surface 13, which provides a reliable support point for the end plate 4. During the process of the end plate 4 sliding in along the first guide surface 411, when the abutting surface 412 contacts the bottom surface 13 of the housing 1 and the bearing surface 421 is also firmly seated on the bearing surface 32, the sliding of the end plate 4 is stopped, and the installation process naturally terminates.

[0079] This provides installers with clear physical feedback. Without the need for measurement or estimation, it ensures that each installation reaches the uniquely correct location, guaranteeing product consistency.

[0080] When the contact surface 412 abuts against the bottom surface 13, the bearing surface 421 also abuts against the bearing surface 32. At this time, the height of the first part 41 along the direction from the bottom surface 13 to the opening 12 is the same as the height of the crossbeam 3 in this direction.

[0081] For example, the dimensions of the two ends of the first guide surface 411 in the first direction (see...) Figure 3 The diameter (H) is greater than or equal to 4 mm and less than or equal to 8 mm. Specifically, the dimensions of both ends of the first guide surface 411 in the first direction can be 4 mm, 5 mm, 6 mm, 7 mm, or 8 mm, to ensure that the end plate 4 can be installed smoothly.

[0082] See also Figure 2 and Figure 3 As shown. In one embodiment, the battery device 100 further includes a fastener 5. The fastener 5 passes through the bearing surface 421 and the receiving surface 32, and connects the second part 42 to the crossbeam 3.

[0083] Fastener 5 provides a reliable mechanical connection, firmly binding the second part 42 of end plate 4 to crossbeam 3 into a single unit. The position of crossbeam 3 is fixed, and when fastener 5 secures the end plate to crossbeam 3, the position of end plate 4 is also fixed.

[0084] When the external tooling is removed, the rebound force of the battery assembly 2 will act on the end plate 4, tending to push the end plate 4 away from the crossbeam 3. The fastener 5, through its shear and tensile strength, transmits this rebound force from the end plate 4 to the crossbeam 3, thereby fixing the end plate 4, and in turn fixing the battery assembly 2, and maintaining the fastening force of the battery assembly 2.

[0085] For example, fastener 5 includes, but is not limited to: bolts, snap rings, and rivets.

[0086] For example, the connection methods between the fastener 5 and the second part 42 include, but are not limited to, at least one of the following: bolt connection, snap-fit, plug-in connection, latch connection, magnetic connection, and adhesive bonding.

[0087] For example, the connection methods between the fastener 5 and the crossbeam 3 include, but are not limited to, at least one of the following: bolt connection, snap-fit, plug-in connection, locking connection, magnetic connection, and adhesive bonding.

[0088] The following explanation will take fastener 5 as an example of a bolt.

[0089] See Figure 2 , Figure 3 and Figure 4As shown. In one embodiment, the second part 42 further includes a mounting hole 422 and a recess 423. The mounting hole 422 extends through the bearing surface 421 along the direction from the opening 12 to the bottom surface 13. The recess 423 is located on the side of the second part 42 opposite to the crossbeam 3. The end of the mounting hole 422 away from the bearing surface 421 penetrates the bottom wall of the recess 423. The fastener 5 passes through the recess 423 and is inserted into the mounting hole 422.

[0090] Without the recess 423, the head of the fastener 5 will protrude from the outer surface of the second part 42 of the end plate 4. This will interfere with the subsequently installed top plate of the housing 1, causing the top cover to be unable to be installed flat, or creating unnecessary compressive stress on the head of the fastener 5.

[0091] The countersunken groove 423 provides a dedicated receiving space for the head of the fastener 5 (such as a bolt). Thus, the outer surface of the end plate 4 is a flat plane, providing an unobstructed contact surface for the installation of the top plate.

[0092] Mounting hole 422 provides initial positioning for fastener 5. When fastener 5 is screwed into the threaded hole of beam 3, mounting hole 422 with a certain depth can provide precise guidance for the initial stage of fastener 5 and prevent thread misalignment.

[0093] The countersunker 423 provides a natural positioning recess for sockets in automated tightening equipment or for manually operated wrenches. During operation, the tool can easily engage with the countersunker 423, thereby increasing assembly speed, reducing operational difficulty, and ensuring the accuracy of tightening torque application.

[0094] The countersunk groove 423 can also shorten the length of the fastener 5, thereby increasing the strength of the fastener 5 connection.

[0095] See also Figure 2 , Figure 3 As shown. In one embodiment, the battery device 100 further includes a support member 6 disposed in the mounting hole 422 and located on the periphery of the support member 6. The support member 6 extends axially along the mounting hole 422, and the length of the support member 6 is greater than or equal to the length of the mounting hole 422.

[0096] When the battery assembly 100 is subjected to vibration and impact, a lateral force (perpendicular to the bolt axis) is generated between the end plate 4 and the crossbeam 3. Without the support member 6, this lateral force is entirely borne by the bolt shank, placing it in a state of shear stress. The support member 6 bears most of the lateral shear force and disperses it, thus protecting the bolt and ensuring the stability of the connection.

[0097] Meanwhile, the 6 support components provide support for the fasteners 5, reducing the possibility of permanent plastic deformation of the end plate 4 due to excessive bolt torque during the first assembly.

[0098] For example, support 6 may be a sleeve arranged circumferentially along the bolt.

[0099] In one embodiment, the sum of the thicknesses of the first portion 41 and the crossbeam 3 in the first direction is equal to the thickness of the second portion 42 in the first direction.

[0100] When the sum of the thickness of the first part 41 and the thickness of the crossbeam 3 equals the thickness of the second part 42, it means that the outer surface of the second part 42 will be on the same vertical plane as the outer surface of the crossbeam 3. In this way, the outer surface of the second part 42 will be neat and aesthetically pleasing with the outer surface of the crossbeam 3.

[0101] Meanwhile, end plates 4 are typically not included in CTP batteries. This application includes end plates 4, but this arrangement reduces the space required to accommodate the load-bearing structure of the end plates 4 and the crossbeam 3. The saved space can be directly used to increase the number of individual battery cells 21, or to provide more space for core components such as the battery assembly 2 and the cooling system without changing the overall dimensions of the battery device 100.

[0102] See Figure 1 , Figure 2 and Figure 5 As shown. In one embodiment, the second portion 42 further includes a low-voltage socket 424 extending through the second portion 42 in a first direction. The battery device 100 includes a low-voltage connector 7, which is connected to the battery assembly 2 via the low-voltage socket 424.

[0103] In one embodiment, the battery device 100 further includes a flexible acquisition plate 9 (FPC), which extends along the arrangement direction of the plurality of battery cells 21 and is connected to the battery assembly 2. The flexible acquisition plate 9 can be connected to a low-voltage plug 7 via a low-voltage socket 424 and fixed to the end plate 4.

[0104] In one embodiment, the second part 42 is provided with a pole post fixing seat 8 and a pole post cover plate 81 for fixing at one end along its extension direction. The pole post fixing seat 8 and the pole post cover plate 81 are used to install the pole post.

[0105] For example, the connection methods between the pole post fixing base 8 and the second part 42 include, but are not limited to, at least one of the following: bolt connection, snap-fit, plug-in connection, latch connection, magnetic connection, and adhesive bonding.

[0106] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement 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 described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery device (100), characterized in that, include: Box (1), the box (1) forms an accommodating space (11) with an opening (12) on one side, the box (1) includes a bottom surface (13) opposite to the opening (12). Battery assembly (2) is located in the accommodating space (11); A crossbeam (3) is located in the accommodating space (11) and arranged with the battery assembly (2); the arrangement direction of the battery assembly (2) and the crossbeam (3) is a first direction, which is perpendicular to the direction from the bottom surface (13) to the opening (12); An end plate (4) is located at least partially between the crossbeam (3) and the battery assembly (2); the surface of the end plate (4) facing the crossbeam (3) along the first direction is a first guide surface (411); the first guide surface (411) is inclined away from the battery assembly (2) along the direction from the bottom surface (13) to the opening (12); at least a portion of the end plate (4) is located on the side of the crossbeam (3) facing the opening (12) and is connected to the crossbeam (3).

2. The battery device (100) according to claim 1, characterized in that, The surface of the crossbeam (3) facing the end plate (4) along the first direction is the second guide surface (31); the second guide surface (31) is inclined away from the end plate (4) along the direction from the bottom surface (13) to the opening (12); the second guide surface (31) abuts against the first guide surface (411).

3. The battery device (100) according to claim 2, characterized in that, The end plate (4) includes: The first part (41) is located between the battery assembly (2) and the crossbeam (3); the first guide surface (411) is located in the first part (41). The second part (42) is located on the side of the first part (41) facing the opening (12) and extends along the first direction to the space between the beam (3) and the opening (12). The second part (42) abuts against the beam (3) along the direction from the bottom surface (13) to the opening (12).

4. The battery device (100) according to claim 3, characterized in that, The second part (42) includes a bearing surface (421) facing the crossbeam (3), the bearing surface (421) being connected to the first guide surface (411); The crossbeam (3) includes a receiving surface (32) facing the opening (12), the receiving surface (32) being connected to the second guide surface (31), and the receiving surface (32) and the bearing surface (421) being arranged opposite to each other along the direction from the bottom surface (13) to the opening (12).

5. The battery device (100) according to claim 3, characterized in that, The side of the first part (41) facing the bottom surface (13) includes an abutment surface (412), which is connected to the first guide surface (411), and the first part (41) abuts against the bottom surface (13) through the abutment surface (412).

6. The battery device (100) according to claim 4, characterized in that, The battery device (100) also includes a fastener (5); the fastener (5) passes through the bearing surface (421) and the receiving surface (32) and connects the second part (42) to the crossbeam (3).

7. The battery device (100) according to claim 6, characterized in that, The second part (42) also includes: The mounting hole (422) extends through the bearing surface (421) along the direction from the opening (12) to the bottom surface (13). A sinkhole (423) is provided on the side of the second part (42) away from the crossbeam (3); the end of the mounting hole (422) away from the bearing surface (421) passes through the bottom wall of the sinkhole (423); the fastener (5) passes through the mounting hole (422) through the sinkhole (423).

8. The battery device (100) according to claim 7, characterized in that, The battery device (100) further includes: A support member (6) is disposed in the mounting hole (422) and located on the periphery of the support member (6); the support member (6) extends axially along the mounting hole (422), and the length of the support member (6) is greater than or equal to the length of the mounting hole (422).

9. The battery device (100) according to claim 3, characterized in that, The sum of the thicknesses of the first part (41) and the crossbeam (3) in the first direction is equal to the thickness of the second part (42) in the first direction.

10. The battery device (100) according to claim 1, characterized in that, The battery assembly (2) includes: Multiple battery cells (21) arranged along the first direction; Multiple insulating elements (22), one of which is located between two adjacent battery cells (21), and the insulating element (22) is elastically deformable.

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