Battery case

Abstract

The application discloses a battery box body, and belongs to the technical field of batteries. The battery box body comprises a lower box body, a cover plate, a sealing element and a fixing element. The lower box body is provided with a mounting port and a mounting structure forming the mounting port. The cover plate is shielded on the mounting port and is provided with a connecting hole. The sealing element is arranged around the peripheral side of the mounting port and is located between the mounting structure and the cover plate. The fixing element is provided with a target axis. The fixing element is arranged in the connecting hole along the direction of the target axis and is connected to the mounting structure. The fixing element is provided with a limiting portion. At least part of the limiting portion is located on the side of the mounting structure facing the sealing element, so as to limit the movement of the fixing element along the direction of the target axis towards the mounting structure. When the lower box body and the cover plate are connected by using the fixing element, the distance between the mounting structure and the cover plate can be effectively controlled, the sealing element is prevented from being excessively pressed, and the sealing failure of the sealing element is avoided.

Description

Technical Field

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

[0002] The battery pack includes a battery housing, battery cells, and a battery management system. Multiple battery cells are fixedly installed inside the battery housing, which provides support and protection for the battery cells and other components during use.

[0003] In related technologies, after the lower casing and the cover are connected by fasteners, a seal (such as sealing foam) is usually placed between the mounting structure and the cover to improve the sealing performance of the battery casing. However, when the lower casing and the cover are connected by fasteners, the distance between the mounting structure and the cover cannot be effectively controlled, which can easily cause the seal to be over-compressed, resulting in seal failure. Utility Model Content

[0004] One of the objectives of this application is to provide a battery housing that avoids sealing failure, thereby at least partially solving the aforementioned technical problems.

[0005] To achieve the above objectives, this application provides a battery housing, comprising: The lower housing has an installation opening and an installation structure that forms the installation opening; A cover plate that conceals the mounting opening and has connection holes; A seal is placed around the periphery of the mounting opening and is located between the mounting structure and the cover plate. A fastener has a target axis, the fastener is inserted through a connecting hole along the target axis, and is connected to the mounting structure; The fastener has a limiting portion, at least a portion of which is located on the side of the mounting structure facing the seal, to restrict the fastener from moving toward the mounting structure along the target axis.

[0006] Optionally, the elastic compression ratio of the seal along the target axis is between 45% and 60%.

[0007] Optionally, the seal has a limiting hole, and the limiting portion passes through the limiting hole; or, The limiting part passes through the limiting hole and the connecting hole.

[0008] Optionally, the mounting structure has a fixing hole, a fastener is connected to the fixing hole, and the battery housing includes a sealing ring that surrounds the periphery of the fixing hole. The sealing ring is located on the side of the limiting portion facing the mounting structure and abuts against the mounting structure.

[0009] Optionally, the limiting part has a mounting groove into which the sealing ring extends to limit the offset of the sealing ring in a direction perpendicular to the target axis.

[0010] Optionally, the sealing ring elastically abuts against the inner wall of the mounting groove; or, The sealing ring is connected to the inner wall of the mounting groove.

[0011] Optionally, the mounting groove has a first groove inner wall and a second groove inner wall, and the sealing ring is located between the first groove inner wall and the second groove inner wall. There is a target distance between the first groove inner wall and the second groove inner wall, and the target distance gradually increases from the limiting part toward the mounting structure.

[0012] Optionally, the seal has a limiting hole, the outer diameter of which is not greater than the inner diameter of the limiting hole.

[0013] Optionally, the mounting structure includes a nut forming a fixing hole and a mounting plate connected to the nut, a seal connected to the mounting plate, and the nut being configured as a press-fit nut.

[0014] Optionally, the fastener has a fixing part and a screwing part, the fixing part and the screwing part are located on opposite sides of the limiting part, the fixing part is threadedly connected to the fixing hole, and the radial dimension of the fixing part is smaller than the radial dimension of the limiting part.

[0015] In the battery case of this application embodiment, the fixing member is located on the side of the mounting structure facing the sealing member by the limiting part, which can restrict the movement of the fixing member towards the mounting structure along the target axis. Therefore, when the lower case and the cover are connected by the fixing member, the distance between the mounting structure and the cover can be effectively controlled, so as to avoid the sealing member being excessively squeezed and to avoid the sealing member failing. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments 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.

[0016] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0017] Figure 1 This is a schematic diagram of the overall structure of the battery box in an exemplary embodiment of this disclosure; Figure 2 yes Figure 1 Exploded view of the battery compartment; Figure 3 yes Figure 1 Sectional view at point AA; Figure 4 yes Figure 3 Enlarged schematic diagram of part B; Figure 5 This is a cross-sectional view of the fastener in an exemplary embodiment of this disclosure.

[0018] Explanation of reference numerals in the attached figures: 1. Lower housing; 11. Mounting port; 12. Mounting structure; 121. Fixing hole; 122. Nut; 123. Mounting plate; 2. Cover plate; 21. Connecting hole; 3. Sealing element; 31. Limiting hole; 4. Fixing component; 41. Limiting part; 42. Mounting groove; 421. Inner wall of the first groove; 422. Inner wall of the second groove; 43. Fixing part; 44. Tightening part; 5. Sealing ring; X, target axis; D, target spacing. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0020] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0021] In the various figures of this application, for ease of illustration, certain dimensions of structures or parts may be exaggerated relative to other structures or parts; therefore, they are only used to illustrate the basic structure of the subject matter of this application.

[0022] Please see Figure 1 and Figure 2 This application provides a battery housing, including a lower housing 1, a cover plate 2, a sealing element 3, and a fixing element 4.

[0023] In some embodiments, the lower housing 1 has a mounting opening 11 and a mounting structure 12 forming the mounting opening 11.

[0024] In this embodiment, the mounting port 11 is located at the top of the lower housing 1. The mounting structure 12 surrounds the periphery of the mounting port 11.

[0025] In some embodiments, the cover plate 2 covers the mounting opening 11.

[0026] In this embodiment, after the cover plate 2 covers the mounting opening 11, it can seal the inside of the battery box.

[0027] In some embodiments, the seal 3 surrounds the periphery of the mounting port 11 and is located between the mounting structure 12 and the cover plate 2.

[0028] In this embodiment, the sealing element 3 can seal the periphery of the mounting port 11. The sealing element 3 can also seal the joint between the lower housing 1 and the cover plate 2, that is, seal the connection between the mounting structure 12 and the cover plate 2.

[0029] In some embodiments, in conjunction with reference Figure 3 and Figure 4 As shown, the fastener 4 has a target axis X.

[0030] In this embodiment, the target axis X is the axis of the cylindrical fastener 4.

[0031] In some embodiments, the cover plate 2 has a connection hole 21.

[0032] In this embodiment, the connecting hole 21 can be a through hole.

[0033] For example, the battery housing may include multiple fasteners 4, and the cover plate 2 has connection holes 21 that correspond one-to-one with the fasteners 4.

[0034] In some embodiments, the fastener 4 passes through the connection hole 21 along the target axis X direction, and the fastener 4 is connected to the mounting structure 12.

[0035] In this embodiment, after the fastener 4 passes through the connecting hole 21, it docks with the mounting structure 12 (e.g., threaded connection), thereby achieving mutual fixation between the cover plate 2 and the lower housing 1 (e.g., mounting structure 12).

[0036] In some embodiments, in conjunction with reference Figure 4 and Figure 5 As shown, the fastener 4 has a limiting part 41.

[0037] In some embodiments, at least a portion of the limiting portion 41 is located on the side of the mounting structure 12 facing the seal 3 to restrict the movement of the fixing member 4 toward the mounting structure 12 along the target axis X direction.

[0038] In this embodiment, during the connection process between the fixing member 4 and the mounting structure 12, the fixing member 4 can move towards the mounting structure 12 along the target axis X direction, and the limiting part 41 will not interfere with the movement of the fixing member 4 during this process. When the fixing member 4 is connected to the mounting structure 12 in place, for example, when the elastic compression ratio of the seal 3 along the target axis X direction reaches the requirement, since part of the limiting part 41 is located on the side of the mounting structure 12 facing the seal 3, the limiting part 41 can restrict the fixing member 4 from continuing to move towards the mounting structure 12 along the target axis X direction, thereby avoiding excessive compression of the seal 3 and resulting in seal failure.

[0039] In this embodiment, the fixing member 4 is located on the side of the mounting structure 12 facing the sealing member 3 by the limiting part 41, which can restrict the movement of the fixing member 4 along the target axis X toward the mounting structure 12. Thus, when the lower housing 1 and the cover plate 2 are connected by the fixing member 4, the distance between the mounting structure 12 and the cover plate 2 can be effectively controlled, so as to avoid the sealing member 3 being excessively squeezed and to avoid the sealing member 3 failing to seal.

[0040] In some embodiments, the elastic compression rate of the seal 3 along the target axis X direction is between 45% and 60%.

[0041] In this embodiment, as Figure 4 When the fastener 4 is connected to the mounting structure 12, the elastic compression ratio of the seal 3 along the target axis X direction is between 45% and 60%, ensuring that the seal 3 meets the sealing performance requirements. That is, it avoids the seal 3 failing to meet the sealing requirements due to an excessively small elastic compression ratio (e.g., less than 45%), and avoids the seal 3 failing to rebound due to an excessively large elastic compression ratio (e.g., greater than 60%).

[0042] For example, the elastic compressibility of the seal 3 along the target axis X direction refers to the ratio between the thickness of the seal 3 after compression along the target axis X direction and the thickness of the seal 3 in its natural state along the target axis X direction.

[0043] In this embodiment, the elastic compression amount of the seal 3 can be determined based on the elastic compression rate of the seal 3. Based on this, the limiting part 41 is designed to fit the seal 3, which can effectively control the distance between the mounting structure 12 and the cover plate 2 and prevent the seal 3 from being excessively squeezed.

[0044] For example, when the seal 3 is subjected to an external force (such as the squeezing force applied by the cover plate 2 towards the mounting structure 12), the seal 3 can undergo elastic compression (i.e., elastic deformation). After the seal 3 elastically abuts against the cover plate 2, it can prevent moisture, dust, salt spray, etc. from entering the battery box, avoiding safety accidents such as battery short circuit, corrosion, insulation failure, thermal runaway, or even fire and explosion. It can be used in electric vehicles, energy storage systems, etc., where strict waterproof and dustproof requirements (such as IP67 or higher) are required.

[0045] For example, the seal 3 can be made of sealing foam. When the fastener 4 is connected to the mounting structure 12, the elastic compression ratio of the seal 3 along the target axis X direction can be 50%, thereby ensuring that the sealing performance between the mounting structure 12 and the cover plate 2 meets the IP67 rating. Of course, the elastic compression ratio of the seal 3 along the target axis X direction can also be any value between 45% and 60%, such as 45%, 46%, 47%, 48%, 49%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, etc.

[0046] In some embodiments, continue to refer to Figure 2 and Figure 4 As shown, the seal 3 has a limiting hole 31.

[0047] In this embodiment, the fixing member 4 is inserted into the limiting hole 31.

[0048] For example, the seal 3 has a limiting hole 31 that corresponds one-to-one with the fixing member 4.

[0049] In some embodiments, the limiting part 41 passes through the limiting hole 31 and the connecting hole 21.

[0050] In this embodiment, when the limiting part 41 is simultaneously inserted into the limiting hole 31 and the connecting hole 21, the portion of the fastener 4 that protrudes radially from the fastening part 43 (see description below) increases, thereby improving the structural strength of the fastener 4 and simplifying the structure of the fastener 4.

[0051] For example, the limiting part 41 can be a cylindrical structure extending along the target axis X, so that it can be located in both the limiting hole 31 and the connecting hole 21 at the same time.

[0052] In some other embodiments not shown, the limiting part 41 passes through the limiting hole 31.

[0053] In this embodiment, when the limiting part 41 is only inserted through the limiting hole 31, that is, only a small part of the fixing member 4 protrudes from the fixing part 43 in the radial direction of the fixing part 43. As long as the fixing member 4 can be restricted from moving toward the mounting structure 12, the weight of the fixing member 4 can be reduced.

[0054] In some embodiments, continue to refer to Figure 4 As shown, the mounting structure 12 has a fixing hole 121, and the fastener 4 is connected to the fixing hole 121.

[0055] In this embodiment, the fastener 4 can be threaded into the fixing hole 121 to achieve a detachable connection.

[0056] In some embodiments, the battery housing includes a sealing ring 5 surrounding the periphery of the fixing hole 121.

[0057] In this embodiment, the sealing ring 5 surrounds the periphery of the fixing hole 121, thereby effectively sealing the periphery of the fixing hole 121 and preventing leakage at the threaded connection between the fixing member 4 and the fixing hole 121.

[0058] In some embodiments, the sealing ring 5 is disposed on the side of the limiting portion 41 facing the mounting structure 12, and the sealing ring 5 abuts against the mounting structure 12.

[0059] In this embodiment, the sealing ring 5 is located between the limiting part 41 and the mounting structure 12, which can prevent leakage between the limiting part 41 and the mounting structure 12, thereby preventing water vapor or air from entering the battery box from between the limiting part 41 and the mounting structure 12, meeting the sealing requirements of IP67 and above protection level, and improving the safety of the battery box.

[0060] In this embodiment, by providing a sealing ring 5 between the limiting part 41 and the mounting structure 12, when the fixing part 4 and the mounting structure 12 are connected in place, the sealing ring 5 is compressed and elastically deformed, thereby forming a reliable sealing barrier between the limiting part 41 and the mounting structure 12, effectively blocking the path of water vapor, dust and other substances to seep into the battery box through the fixing hole 121, and improving the sealing performance of the battery box.

[0061] For example, the sealing ring 5 can be a hydrogenated nitrile rubber (HNBR) sealing ring, which makes the sealing ring 5 have strong aging resistance and more reliable dynamic sealing effect. It can also avoid sealing failure due to plastic deformation of the sealing ring 5 under the vibration condition of the battery box.

[0062] In some embodiments, continue to refer to Figure 4 and Figure 5 As shown, the limiting part 41 has a mounting groove 42.

[0063] In some embodiments, the sealing ring 5 extends into the mounting groove 42 to limit the offset of the sealing ring 5 in a direction perpendicular to the target axis X.

[0064] In this embodiment, by extending the sealing ring 5 into the mounting groove 42, the movement and damage of the sealing ring 5 can be restricted, which facilitates the sealing connection between the fastener 4 and the mounting structure 12 and ensures the sealing performance between the fastener 4 and the mounting structure 12.

[0065] In this embodiment, after the sealing ring 5 extends into the mounting groove 42, it can prevent the sealing ring 5 from being squeezed into the fixing hole 121 when it is over-compressed, so that the sealing ring 5 is compressed and fills the space between the limiting part 41 and the mounting structure 12, thereby forming a sealing barrier.

[0066] In this embodiment, when the fixing member 4 and the fixing hole 121 are not concentric, inserting the sealing ring 5 into the mounting groove 42 can also prevent the sealing ring 5 from being cut and damaged under external force.

[0067] In this embodiment, compared to solutions where "no mounting groove is provided on the limiting part" or "the limiting part and the sealing ring are fixed by adhesive application," this solution can also prevent the sealing ring 5 from shifting or rebounding due to vibration, thereby avoiding gaps at the sealing interface. Furthermore, the sealing ring 5 is not sensitive to tightening torque, preventing crushing failure due to excessive tightening torque and leakage due to insufficient compression caused by excessively loose tightening torque.

[0068] For example, the mounting groove 42 can be an annular groove surrounding the periphery of the fixing hole 121, thereby improving the sealing performance at the fixing hole 121. The direction perpendicular to the target axis X can be the radial direction of the fixing member 4.

[0069] In some embodiments, continue to refer to Figure 4 As shown, the sealing ring 5 elastically abuts against the inner wall of the mounting groove 42.

[0070] In this embodiment, by pre-compressing the sealing ring 5, it is able to elastically abut against the inner wall of the mounting groove 42 after being embedded in the mounting groove 42, thereby preventing the sealing ring 5 from becoming loose within the mounting groove 42. This prevents the sealing ring 5 from becoming loose during the connection between the fastener 4 and the mounting structure 12, and also prevents the sealing ring 5 from becoming loose due to vibration after the fastener 4 and the mounting structure 12 are in place, thus improving the stability of the sealing ring 5 within the mounting groove 42.

[0071] For example, by setting the molding temperature to 170°C, the sealing ring 5 can be pre-compressed in the mounting groove 42. The pre-compression rate of the sealing ring 5 filling the mounting groove 42 is 15%~25%, thereby making the sealing ring 5 elastically abut against the inner wall of the mounting groove 42.

[0072] In other embodiments, the sealing ring 5 is connected to the inner wall of the mounting groove 42.

[0073] In this embodiment, the sealing ring 5 can be fixed in the mounting groove 42 by pre-embedding. For example, during the injection molding process of the sealing ring 5, the fixing member 4 is placed in the molding mold of the sealing ring 5, and after the sealing ring 5 is formed, it is connected to the inner wall of the mounting groove 42.

[0074] In some embodiments, continue to refer to Figure 4 and Figure 5 As shown, the mounting groove 42 has a first groove inner wall 421 and a second groove inner wall 422, and the sealing ring 5 is located between the first groove inner wall 421 and the second groove inner wall 422.

[0075] In this embodiment, after the sealing ring 5 extends into the mounting groove 42, it can abut against the inner wall 421 of the first groove and the inner wall 422 of the second groove, or it can be connected to the inner wall 421 of the first groove and the inner wall 422 of the second groove.

[0076] In some embodiments, there is a target distance D between the inner wall 421 of the first groove and the inner wall 422 of the second groove, and the target distance D gradually increases in the direction from the self-limiting part 41 toward the mounting structure 12.

[0077] In this embodiment, the cross-section of the mounting groove 42 is tapered, which can prevent the sealing ring 5 from being damaged due to large torque during the connection between the fastener 4 and the mounting structure 12.

[0078] In this embodiment, during the connection process between the fastener 4 and the mounting structure 12, after the sealing ring 5 undergoes elastic deformation, the tapered mounting groove 42 can effectively support the sealing ring 5, preventing it from loosening during the connection process. It also prevents the sealing ring 5 from shifting after the fastener 4 and the mounting structure 12 are in place.

[0079] In some embodiments, continue to refer to Figure 4 As shown, the outer diameter of the limiting part 41 is not greater than the inner diameter of the limiting hole 31.

[0080] In this embodiment, when the seal 3 is in its natural state (i.e., before the seal 3 is compressed), the limiting part 41 and the limiting hole 31 are in a clearance fit. Therefore, after the seal 3 is subjected to compressive elastic deformation, the gap between the limiting part 41 and the limiting hole 31 provides buffer space for the elastic deformation of the seal 3. Furthermore, it facilitates the insertion of the limiting part 41 into the limiting hole 31 for installation.

[0081] For example, when the seal 3 is in its natural state, the gap between the limiting part 41 and the limiting hole 31 can be 0.5 mm.

[0082] In some embodiments, continue to refer to Figure 4 As shown, the mounting structure 12 includes a nut 122 forming a fixing hole 121 and a mounting plate 123 connected to the nut 122.

[0083] In this embodiment, the mounting structure 12 uses a nut 122 to form a fixing hole 121, thereby connecting with the fixing member 4. Compared with the solution of "directly setting threaded holes on the mounting plate", this solution can improve the connection strength between the lower housing 1 and the cover plate 2.

[0084] For example, the mounting structure 12 includes nut pieces 122 that correspond one-to-one with the fasteners 4.

[0085] In some embodiments, the seal 3 is connected to the mounting plate 123.

[0086] In this embodiment, after the seal 3 is connected to the mounting plate 123, it can prevent the seal 3 from becoming loose when the cover plate 2 and the lower box 1 are connected.

[0087] For example, the seal 3 can be adhered to the mounting plate 123.

[0088] For example, the cover plate 2 abuts against the side of the seal 3 opposite to the mounting plate 123. The sealing ring 5 abuts against the side of the mounting plate 123 opposite to the nut 122. The mounting plate 123 may be formed by bending the lower housing 1, for example by folding the edge of the lower housing 1.

[0089] In some embodiments, the nut 122 is configured as a press-fit nut.

[0090] In this embodiment, compared with the solution of "using a rivet nut for the nut part", the use of a press-fit nut for the nut part 122 in this solution reduces the volume of the mounting structure 12 and lowers the cost of the mounting structure 12.

[0091] For example, the press-fit nut can be a blind hole press-fit nut, thereby improving the sealing of the battery box and preventing moisture or gas from entering the battery box through the nut 122.

[0092] In some embodiments, continue to refer to Figure 5 As shown, the fastener 4 has a fixing part 43 and a screwing part 44.

[0093] In this embodiment, the limiting part 41 connects the fixing part 43 and the screwing part 44.

[0094] For example, the fixing part 43, the limiting part 41, and the screwing part 44 are integrally formed by cold forging process.

[0095] In some embodiments, the fixing part 43 and the screwing part 44 are located on opposite sides of the limiting part 41.

[0096] In this embodiment, the fixing member 4 is formed by connecting the fixing part 43, the limiting part 41 and the screwing part 44 in sequence, which simplifies the structure of the fixing member 4. At this time, the limiting part 41 can be inserted into the connecting hole 21 and the limiting hole 31 at the same time.

[0097] In some embodiments, the fixing part 43 is threadedly connected to the fixing hole 121.

[0098] In this embodiment, the radial end face of the fixing part 43 is provided with threads, and the fixing hole 121 is set as a threaded hole, thereby realizing the threaded connection between the fixing part 4 and the mounting structure 12.

[0099] In some embodiments, the radial dimension of the fixing part 43 is smaller than the radial dimension of the limiting part 41.

[0100] In this embodiment, the limiting part 41 protrudes radially from the fixing part 43, so that the mounting groove 42 can be provided on the side of the limiting part 41 facing the fixing part 43, that is, on the axial end face of the limiting part 41 facing the fixing part 43.

[0101] For example, the radial dimension of the limiting part 41 is smaller than the radial dimension of the screwing part 44.

[0102] For example, a screwing groove is provided on the end face of the screwing part 44 opposite to the limiting part 41. The screwing groove can be flat or star-shaped to accommodate different screwdrivers. This facilitates the rotation of the fixing part 4 using a corresponding screwdriver, so as to connect or disconnect the mounting structure 12.

[0103] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0104] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0105] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0106] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A battery housing, characterized in that, include: The lower housing (1) has a mounting opening (11) and a mounting structure (12) forming the mounting opening (11). Cover plate (2), which covers the mounting opening (11) and has a connection hole (21); A sealing element (3) surrounds the periphery of the mounting port (11) and is located between the mounting structure (12) and the cover plate (2); The fastener (4) has a target axis (X), the fastener (4) is inserted through the connecting hole (21) along the target axis (X) and connected to the mounting structure (12); The fastener (4) has a limiting portion (41), at least a portion of which is located on the side of the mounting structure (12) facing the seal (3) to restrict the fastener (4) from moving toward the mounting structure (12) along the target axis (X).

2. The battery housing as described in claim 1, characterized in that, The elastic compressibility of the seal (3) along the target axis (X) is between 45% and 60%.

3. The battery housing as described in claim 1, characterized in that, The sealing element (3) has a limiting hole (31), and the limiting part (41) passes through the limiting hole (31); or, The limiting part (41) passes through the limiting hole (31) and the connecting hole (21).

4. The battery housing as described in claim 1, characterized in that, The mounting structure (12) has a fixing hole (121), the fixing member (4) is connected to the fixing hole (121), the battery box includes a sealing ring (5), the sealing ring (5) surrounds the periphery of the fixing hole (121), the sealing ring (5) is disposed on the side of the limiting part (41) facing the mounting structure (12), and abuts against the mounting structure (12).

5. The battery housing as described in claim 4, characterized in that, The limiting part (41) has a mounting groove (42), and the sealing ring (5) extends into the mounting groove (42) to limit the sealing ring (5) from shifting in a direction perpendicular to the target axis (X).

6. The battery housing as described in claim 5, characterized in that, The sealing ring (5) elastically abuts against the inner wall of the mounting groove (42); or, The sealing ring (5) is connected to the inner wall of the mounting groove (42).

7. The battery housing as described in claim 5, characterized in that, The mounting groove (42) has a first groove inner wall (421) and a second groove inner wall (422). The sealing ring (5) is located between the first groove inner wall (421) and the second groove inner wall (422). There is a target distance (D) between the first groove inner wall (421) and the second groove inner wall (422). The target distance (D) gradually increases from the limiting part (41) toward the mounting structure (12).

8. The battery housing as described in claim 1, characterized in that, The sealing element (3) has a limiting hole (31), and the outer diameter of the limiting part (41) is not greater than the inner diameter of the limiting hole (31).

9. The battery housing as described in claim 4, characterized in that, The mounting structure (12) includes a nut (122) forming the fixing hole (121) and a mounting plate (123) connected to the nut (122), the sealing element (3) being connected to the mounting plate (123), and the nut (122) being configured as a press-fit nut.

10. The battery housing as described in claim 4, characterized in that, The fastener (4) has a fixing part (43) and a screwing part (44). The fixing part (43) and the screwing part (44) are located on opposite sides of the limiting part (41). The fixing part (43) is threadedly connected to the fixing hole (121). The radial dimension of the fixing part (43) is smaller than the radial dimension of the limiting part (41).

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