Battery pack and vehicle

Abstract

A battery pack and a vehicle. The battery pack comprises: an upper cover (10); a case body (110), the case body (110) being provided with a support beam (11), and the support beam (11) being connected to the upper cover (10); and connecting members (12), the connecting members (12) passing through the upper cover (10) and being detachably connected to the support beam (11), and fasteners (13) being each connected to the end of a connecting member (12) facing away from the support beam (11). With respect to the battery pack, first the support beam (11) is connected to the upper cover (10) by means of the connecting members (12), and then the battery pack is connected to a chassis of a vehicle by means of the fasteners (13), so as to achieve dual fixation of the battery pack. Therefore, the overall rigidity and the connection reliability of the battery pack can be improved, enhancing the impact resistance of the battery pack, thus improving the safety and the overall stability of the battery pack under severe working conditions.

Description

Battery pack and vehicle

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on September 15, 2023, with application number 202322534038.4 and invention name “A Battery Pack and Vehicle”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application belongs to the field of battery technology, and specifically relates to a battery pack and a vehicle. Background Art

[0003] The battery pack of an electric vehicle serves as the vehicle's power source, providing electrical energy. The battery pack typically consists of a housing and battery cells. The battery cells are housed within the housing, which protects the cells and improves the reliability of the battery pack. In specific applications, the battery pack can be fixedly installed on the vehicle by securing the housing to the vehicle's chassis.

[0004] In existing technology, a battery pack housing typically includes a bottom shell and an upper cover connected to the bottom shell, wherein the upper cover is provided with flanges around its perimeter. The flanges around the upper cover are directly fixed to the vehicle chassis using bolts to secure the battery pack to the vehicle.

[0005] However, since the battery pack is directly fixed to the chassis by bolts through the flange edge of the upper cover, the overall rigidity of the battery pack is relatively small, making it more prone to failure and insufficient impact resistance, affecting the safety and stability of the battery pack.

[0006] Summary of the Invention

[0007] The present application aims to provide a battery pack and a vehicle to solve the problem of low overall rigidity of existing battery packs.

[0008] In order to solve the above technical problems, this application is implemented as follows:

[0009] In a first aspect, the present application discloses a battery pack, comprising:

[0010] Upper cover;

[0011] The box body has a first direction, a second direction and a third direction intersecting in pairs, and a support beam is provided on the box body, and the support beam is connected to the upper cover;

[0012] a connecting member, one end of which passes through the upper cover and is detachably connected to the support beam;

[0013] A fastener is detachably connected to an end of the connector facing away from the support beam to connect the battery pack to the vehicle.

[0014] Optionally, the box body and the upper cover are arranged along a first direction;

[0015] The support beam is arranged in the central area of ​​the upper cover and is connected to a side of the upper cover close to the box body along the first direction.

[0016] Optionally, the connecting member includes a horizontal portion and a vertical portion;

[0017] The vertical portion passes through the upper cover and is connected to the support beam. The horizontal portion is connected to one end of the vertical portion and abuts against a side of the upper cover away from the support beam.

[0018] Optionally, a second connection structure is provided on a side of the horizontal portion away from the vertical portion, and the second connection structure is detachably connected to the fastener.

[0019] Optionally, the second connection structure is any one of a second threaded hole, a buckle or a stud.

[0020] Optionally, a first groove is provided on a side of the horizontal portion away from the vertical portion;

[0021] The second connecting structure is disposed at the bottom of the first groove. The second connecting structure is communicated with the first groove and extends in a direction away from the first groove.

[0022] Optionally, the aperture of the second connecting structure is D1 mm, and the outer diameter of the vertical portion is D2 mm, satisfying: 0.28≤D1 / D2≤0.67.

[0023] Optionally, the vertical portion extends along the first direction, and the second connecting structure extends along the first direction; the height of the second connecting structure along the first direction is H1mm, and the height of the connecting member along the first direction is H2mm, satisfying: 0.75≤H1 / H2≤1.

[0024] Optionally, the battery pack further includes a sealing member, which is disposed between the connecting member and the upper cover to achieve a sealed connection between the connecting member and the upper cover.

[0025] Optionally, a second groove is provided on a side of the horizontal portion close to the vertical portion, and the sealing member is embedded in the second groove.

[0026] Optionally, the sealing member is any one of a sealing ring, a sealing strip or a sealing foam member.

[0027] Optionally, there are multiple connecting members, and the multiple connecting members are arranged at intervals along the second direction.

[0028] Optionally, there are multiple support beams, and the multiple support beams are arranged at intervals along the third direction.

[0029] Optionally, along the third direction, the maximum distance between the support beam at the end and the edge of the box body is W1 mm, and the maximum width of the box body along the third direction is W2 mm, satisfying: 0.35≤W1 / W2≤0.72.

[0030] Optionally, a first mounting structure is provided on the circumference of the upper cover, and the first mounting structure is connected to the box body and is used for detachable connection with the vehicle.

[0031] In a second aspect, the present application further discloses a vehicle, comprising: a chassis and a battery pack as described in any one of the above items; wherein, an end of the fastener facing away from the connecting member is connected to the chassis.

[0032] In an embodiment of the present application, the battery pack may include a connector that can pass through the upper cover to detachably connect the upper cover to the support beam, thereby improving the support capacity of the upper cover and ensuring the reliability of the connection between the upper cover and the support beam. In addition, the connector can also be connected to a fastener to connect the battery pack to the chassis of the vehicle. In this way, the force on the fastener can be directly transferred to the support beam through the connector to mount and fix the battery pack as a whole. In addition, the connector can also fix the support beam and the upper cover at the same time. The fastening relationship of the connector and the fastener will not affect each other, thereby achieving double fixation of the battery pack, thereby improving the overall rigidity and connection reliability of the battery pack, enhancing the impact resistance of the battery pack, and improving the safety and overall stability of the battery pack under harsh working conditions.

[0033] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0035] FIG1 is a schematic structural diagram of a battery pack according to an embodiment of the present application at a certain angle;

[0036] FIG2 is a schematic structural diagram of the battery pack shown in FIG1 from another angle;

[0037] FIG3 is a structural schematic diagram of the battery pack shown in FIG1 from another angle;

[0038] FIG4 is a schematic cross-sectional view of the battery pack shown in FIG1 ;

[0039] FIG5 is a second cross-sectional structural diagram of the battery pack shown in FIG1 ;

[0040] FIG6 is a schematic diagram of the detailed structure of the battery pack A shown in FIG5 ;

[0041] FIG7 is a schematic diagram of the exploded structure of the battery pack shown in FIG1 ;

[0042] FIG8 is a schematic structural diagram of a connector according to an embodiment of the present application;

[0043] FIG9 is a schematic structural diagram of the connecting member shown in FIG8 from another angle;

[0044] FIG10 is a schematic cross-sectional structural diagram of the connecting member shown in FIG8 .

[0045] Figure markings: 10-upper cover, 101-first mounting structure, 102-first through hole, 110-box body, 11-support beam, 111-first threaded hole, 12-connecting piece, 121-horizontal part, 1211-second connecting structure, 1212-first groove, 1213-second groove, 122-vertical part, 13-fastener, 14-sealing piece, x-first direction, y-second direction, z-third direction. Specific embodiments

[0046] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0047] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0048] In this application, the term "parallel" includes not only absolute parallelism but also the generally recognized parallelism in engineering practice, such as "parallel" refers to the state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is -1° to 1°. At the same time, "perpendicular" also includes not only absolute perpendicularity but also the generally recognized perpendicularity in engineering practice, such as "perpendicular" refers to the state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°. Equal distances or equal angles include not only absolute equality but also the generally recognized equality in engineering practice, which may include a certain error, such as a tolerance range of -1% to 1%.

[0049] An embodiment of the present application provides a battery pack. Specifically, the battery pack can be used to house battery cells within the battery pack, thereby providing protection for the battery cells. In practical applications, when the battery pack is used in a vehicle, the battery pack can be connected to the vehicle. Specifically, the upper cover of the battery pack can be connected to the vehicle.

[0050] Referring to Figure 1, a structural schematic diagram of a battery pack according to an embodiment of the present application at a certain angle is shown. Referring to Figure 2, a structural schematic diagram of the battery pack shown in Figure 1 at another angle is shown. Referring to Figure 3, a structural schematic diagram of the battery pack shown in Figure 1 at yet another angle is shown. Referring to Figure 4, one of the cross-sectional structural schematic diagrams of the battery pack shown in Figure 1 is shown. Referring to Figure 5, a second cross-sectional structural diagram of the battery pack shown in Figure 1 is shown. Referring to Figure 6, a detailed structural schematic diagram of the position of battery pack A shown in Figure 5 is shown. Referring to Figure 7, a decomposed structural schematic diagram of the battery pack shown in Figure 1 is shown.

[0051] Specifically, the battery pack may include: an upper cover 10, with a first mounting structure 101 distributed around the upper cover 10; a box body 110, with a support beam 11 provided on the box body 110, the support beam 11 is connected to the upper cover 10, and the first mounting structure 101 is connected to the box body 110; and a connector 12, one end of the connector 12 passes through the upper cover 10 and is detachably connected to the support beam 11; a fastener 13, the fastener 13 is detachably connected to an end of the connector 12 facing away from the support beam 11, and the fastener 13 is connected to the vehicle to connect the battery pack to the vehicle.

[0052] In an embodiment of the present application, the battery pack may include a connector 12, which can pass through the upper cover 10 to detachably connect the upper cover 10 to the support beam 11, thereby improving the support capacity of the upper cover 10 and ensuring the reliability of the connection between the upper cover 10 and the support beam 11. In addition, the connector 12 can also be connected to the fastener 13, thereby being used to connect the battery pack to the chassis of the vehicle. The force on the fastener 13 can be directly transmitted to the support beam 11 through the connector 12, thereby mounting and fixing the battery pack as a whole. In addition, the connector 12 can also fix the support beam 11 and the upper cover 10 at the same time. The fastening relationship of the connector 12 and the fastener 13 will not affect each other, thereby achieving dual fixation of the battery pack. In this way, the overall rigidity and connection reliability of the battery pack can be improved, the impact resistance of the battery pack can be enhanced, and the safety and overall stability of the battery pack under harsh working conditions can be improved.

[0053] In addition, a first mounting structure 101 is provided on the upper cover 10 of the battery pack, and the battery pack can be connected to the chassis of the vehicle through the first mounting structure 101, thereby further improving the overall rigidity and connection reliability of the battery pack.

[0054] In some embodiments, the box body 110 serves as the main structure of the battery pack, and a receiving cavity with an opening is usually provided inside the box body, which can be used to accommodate battery cells. The upper cover 10 can be connected to the opening of the battery box body, and the upper cover 10 can be enclosed with the box body 110 to form a closed receiving cavity to protect the battery cells in the receiving cavity. The battery upper cover 10 is distributed with a first mounting structure 101 around it, and the first mounting structure 101 is connected to the box body 110. The first mounting structure 101 can be provided with mounting holes for bolts, screws and other components to pass through. The first mounting structure 101 can be connected to the chassis of the vehicle through the above-mentioned bolts or screws to fix the battery pack on the vehicle chassis. In the embodiment of the present application, a connector 12 can be added to the battery pack, and a support beam 11 can be added to the battery box body. The connector 12 can pass through the upper cover 10 and be detachably connected to the support beam 11. In practical applications, the connector 12 can be connected to the support beam 11, and then connected to the vehicle chassis to improve the connection reliability of the battery pack on the vehicle.

[0055] For example, the support beam 11 can be connected to the box body 110 by welding, threaded connection, or clamping. The embodiment of the present application does not specifically limit the connection method of the support beam 11 to the box body 110.

[0056] In some optional embodiments of the present application, the box body 110 and the upper cover 10 can be arranged along the first direction x; the support beam 11 is arranged in the central area of ​​the upper cover 10 and is connected to the side of the upper cover 10 close to the box body 110 along the first direction x. In a specific application, since the support beam 11 is arranged in the central area of ​​the upper cover 10, the connector 12 can pass through the central area of ​​the upper cover 10 and connect to the support beam 11 accordingly. In this way, not only can the box body 110 be connected to the chassis of the vehicle, but the force applied to the box body 110 can also be made more uniform, thereby further improving the overall rigidity of the battery pack. The first direction x can be the height direction of the box body 110.

[0057] As shown in Figure 7, a first threaded hole 111 is provided on the support beam 11, and a first through hole 102 is provided at a position corresponding to the first threaded hole 111 on the upper cover 10; the connecting member 12 is provided with a first external thread, and the connecting member 12 can pass through the first through hole 102, and the first external thread on the connecting member 12 and the first threaded hole 111 can be threadedly connected by screws or bolts and other components to achieve a detachable connection between the connecting member 12 and the support beam 11.

[0058] In actual applications, since the threaded connection method is relatively simple and the connection is relatively reliable, when a detachable connection is achieved between the connecting member 12 and the support beam 11 through a threaded connection method, the connection method between the connecting member 12 and the support beam 11 can be made relatively simple and reliable.

[0059] It should be noted that the connecting member 12 and the support beam 11 can also be detachably connected by other means such as snap connection. The embodiment of the present application does not specifically limit the detachable connection method between the connecting member 12 and the support beam 11.

[0060] Referring to FIG8 , a schematic structural diagram of a connector according to an embodiment of the present application is shown. Referring to FIG9 , a schematic structural diagram of the connector shown in FIG8 at another angle is shown. Referring to FIG10 , a schematic cross-sectional structural diagram of the connector shown in FIG8 is shown. As shown in FIG8 to FIG10 , the connector 12 may specifically include a horizontal portion 121 and a vertical portion 122. The horizontal portion 121 is connected to one end of the vertical portion 122 and abuts against the side of the upper cover 10 away from the support beam 11. The vertical portion 122 passes through the upper cover 10 and is connected to the support beam 11. A second connecting structure 1211 is provided on the side of the horizontal portion 121 away from the vertical portion 122. The horizontal portion 121 may be connected to the vehicle chassis through the second connecting structure 1211. Specifically, the second connecting structure 1211 may be connected to the fastener 13 to connect the battery pack to the vehicle chassis.

[0061] In some embodiments, the second connection structure 1211 may be a second threaded hole.

[0062] In other embodiments, the second connection structure 1211 may be a buckle, a stud, or other structure, which is not limited here.

[0063] In a specific application, the connector 12 is divided into a horizontal portion 121 and a vertical portion 122 that are interconnected, and the vertical portion 122 is passed through the upper cover 10 to connect to the support beam 11, and the horizontal portion 121 is connected to the chassis of the vehicle through a second connection structure. Due to the smaller cross-sectional dimensions of the vertical portion 122, when the vertical portion 122 passes through the upper cover 10, the opening on the upper cover 10 can be made smaller, which is beneficial for maintaining the structural integrity of the upper cover 10; and due to the longer length of the vertical portion 122, it is convenient for the vertical portion 122 to fully connect with the support beam 11, thereby improving the connection reliability between the vertical portion 122 and the support beam 11. Due to the larger cross-sectional area of ​​the horizontal portion 121, after the vertical portion 122 passes through the upper cover 10, the bottom surface of the horizontal portion 121 can abut against the top surface of the upper cover 10, preventing the vertical portion 122 from continuing to move downward, thereby improving the connection reliability between the connector 12 and the upper cover 10.

[0064] Optionally, in some embodiments, a mounting hole can be provided on the vehicle chassis at a location corresponding to the connector 12. The fastener 13 can pass through the mounting hole and detachably connect to the second connecting structure 1211 on the connector 12 to connect the connector 12 to the vehicle chassis. By connecting the connector 12 to the vehicle chassis, both the box body 110 and the upper cover 10 in the battery pack can be connected to the vehicle chassis, thereby improving the reliability of the battery pack's connection to the vehicle chassis.

[0065] In some embodiments, the second connection structure 1211 is a second threaded hole, and the fastener 13 is provided with a second external thread. The fastener 13 is detachably connected to the second threaded hole through the second external thread.

[0066] In other embodiments, the second connection structure 1211 may be a slot, and the fastener 13 may be provided with a buckle, and the fastener 13 is engaged with the slot via the buckle.

[0067] As shown in FIG9 , the second connecting structure 1211 is a second threaded hole. A first groove 1212 is provided on one side of the horizontal portion 121 away from the vertical portion 122. The second connecting structure 1211 is disposed at the bottom of the first groove 1212. The second connecting structure 1211 is connected to the first groove 1212 and extends in a direction away from the first groove 1212. In a specific application, the first groove 1212 provides an operating space for tools such as a wrench to enter and fasten the connector 12 to the support beam 11, or to remove the connector 12 from the support beam 11.

[0068] For example, the first groove 1212 can be a hexagonal groove, and the shape of the hexagonal groove can be adapted to the shape of a hexagonal wrench. When the connector 12 needs to be fastened to the support beam 11, the hexagonal wrench can be inserted into the hexagonal groove and turned clockwise to engage the first external thread on the vertical portion 122 with the first threaded hole 111 on the support beam 11. When the connector 12 needs to be removed from the support beam 11, the hexagonal wrench can be inserted into the hexagonal groove and turned counterclockwise to disengage the first external thread on the vertical portion 122 from the first threaded hole 111 on the support beam 11, thereby facilitating the removal of the connector 12 from the support beam 11.

[0069] Optionally, the aperture of second connecting structure 1211 is D1 mm, and the outer diameter of vertical portion 122 is D2 mm, satisfying the following relationship: 0.28 ≤ D1 / D2 ≤ 0.67. In practical applications, when the value of D1 / D2 is greater than or equal to 0.28 and less than or equal to 0.67, the weight energy density of second connecting structure 1211 is high, and the overall structure of connector 12 is more reliable.

[0070] In specific applications, a three-jaw internal micrometer can be used to measure D1, that is, the measuring rod is moved forward by the fixed nut, and the three probes are moved outward to contact the measured hole (second connecting structure 1211) through the cone with a spiral boss at the top of the measuring rod. The measured aperture size D1 is read from the scales on the fixed sleeve and the differential cylinder. For example, a vernier caliper can be used to measure the outer diameter D2 of the vertical portion 122. Specifically, first, the fastening screw can be loosened, and the measuring claw can be moved so that the lower measuring claw is close to the outer wall of the measured object (vertical portion 122). After clamping, the fastening screw can be tightened. At this time, the numbers on the main and auxiliary scales are added together, which is the outer diameter D2 of the vertical portion 122.

[0071] For example, the ratio D1 / D2 of the aperture D1 of the second connecting structure 1211 to the outer diameter D2 of the vertical portion 122 may include but is not limited to any one of 0.28, 0.55, 0.60 and 0.67. The embodiment of the present application does not specifically limit the value of D1 / D2.

[0072] As shown in Figure 10, the vertical portion 122 of the connecting member 12 extends along the first direction x, and the second connecting structure 1211 extends along the first direction x; wherein, the height of the second connecting structure 1211 along the first direction x is H1mm, and the height of the connecting member 12 along the first direction is H2mm, satisfying: 0.75≤H1 / H2≤1.

[0073] In practical applications, when the value of H1 / H2 is greater than or equal to 0.75 and less than or equal to 1, the weight energy density of the second connection structure 1211 and the connection reliability between the second connection structure 1211 and the fastener 13 are high.

[0074] In a specific application, a depth vernier caliper can be used to measure the height H1 of the second connecting structure 1211 along the first direction x. Specifically, the end face of the depth vernier caliper base can be placed against the end face of the hole being measured (second connecting structure 1211), with the caliper blade parallel to the centerline of the hole being measured. The caliper blade is then inserted into the hole. The distance between the end face of the caliper blade and the end face of the base is the depth dimension H1 of the measured part.

[0075] For example, a height vernier caliper can be used to measure the height H2 of the connector 12 along the first direction. Specifically, the height H2 of the connector 12 should be measured on a platform. When the measuring surface of the jaws and the bottom plane of the base are coplanar, such as on the same platform plane, the zero lines of the main scale and the vernier are aligned. Therefore, when measuring height, the height of the jaw measuring surface represents the height dimension of the measured part (connector 12). Its specific value can be read on the main scale (integer portion) and the vernier (decimal portion), similar to a vernier caliper.

[0076] For example, the ratio H1 / H2 of the height H1 of the second connecting structure 1211 to the height H2 of the connecting member 12 may include but is not limited to any one of 0.75, 0.688 and 1. The embodiment of the present application does not specifically limit the value of H1 / H2.

[0077] As shown in Figures 6 and 7, the battery pack may further include a seal 14, which is arranged between the connector 12 and the upper cover 10 to achieve a sealed connection between the connector 12 and the upper cover 10, so as to prevent external impurities such as water or dust from entering the battery pack through the gap between the connector 12 and the upper cover 10 and reducing the airtightness performance of the battery pack.

[0078] For example, the sealing member 14 may include but is not limited to any one of a sealing ring, a sealing strip or a sealing foam member. The embodiment of the present application does not limit the specific content of the sealing member 14.

[0079] As shown in FIG8 , a second groove 1213 is provided on one side of the horizontal portion 121 close to the vertical portion 122 , and the seal 14 can be embedded in the second groove 1213 to improve the connection and support of the seal 14 on the connector 12 and further enhance the sealing effect of the seal 14 .

[0080] In some optional embodiments of the present application, the length direction of the support beam 11 is the second direction y; there are multiple connectors 12, and the multiple connectors 12 are spaced apart along the second direction y. In this way, the support beam 11 can be connected to the vehicle chassis via the multiple connectors 12, further improving the reliability of the battery pack connection to the vehicle.

[0081] It should be noted that the drawings of the embodiments of this application only illustrate a case where four connectors 12 are connected to a support beam 11. In actual applications, the number of connectors 12 connected to a support beam 11 can be set according to actual circumstances. For example, the number of connectors 12 connected to a support beam 11 may include, but is not limited to, two, five, or six. The embodiments of this application do not specifically limit the number of connectors 12 connected to a support beam 11.

[0082] As shown in Figure 3, the width of the box body 110 is in the third direction z, which is perpendicular to the second direction y. Along the third direction y, the distance between the support beam 11 and the edge of the box body 110 is W1, and the maximum width of the box body 110 along the third direction z is W2, satisfying the following: 0.35 ≤ W1 / W2 ≤ 0.72. This improves the reliability of the battery pack's connection to the vehicle and facilitates flexible layout of the support beam 11.

[0083] In actual applications, the closer the difference between W1 / W2 and 0.5 is, the closer the support beam 11 is to the center of the box body 110. At this time, the force applied to the battery pack when connected to the vehicle is more uniform, and the connection of the battery pack to the vehicle is more reliable.

[0084] In a specific application, the distance W1 between the support beam 11 and the edge of the box body 110 and the maximum width W2 of the box body 110 along the third direction z can both be measured using a vernier caliper. Specifically, when measuring W1, the small flat surface of the outer edge end surface of the measuring jaw can be placed on the edge of the box body 110, the micro-motion device can be fixed with a fixing screw, the adjusting nut can be turned so that the outer measuring surface of the measuring jaw lightly contacts the support beam 11, and the position of the two measuring jaws is aligned. The reading of the vernier caliper is W1. Similarly, when measuring W2, the small flat surface of the outer edge end surface of the measuring jaw can be placed on the edge of one side of the box body 110 along the third direction, the micro-motion device can be fixed with a fixing screw, the adjusting nut can be turned so that the outer measuring surface of the measuring jaw lightly contacts the other side of the box body 110 along the third direction, and the position of the two measuring jaws is aligned. The reading of the vernier caliper is W2.

[0085] For example, the ratio W1 / W2 of the distance between the support beam 11 and the edge of the box body 110 is W1 and the maximum width of the box body 110 is W2 can include but is not limited to any one of 0.35, 0.4, 0.55 and 0.72. The embodiment of the present application does not specifically limit the value of W1 / W2.

[0086] The following are Examples 1 to 5 designed with the ratio D1 / D2 of the aperture D1 of the second connecting structure 1211 to the outer diameter D2 of the vertical portion 122. Examples 2, 3, and 4 satisfy the D1 / D2 range of 0.28 to 0.67. Examples 6 to 10 designed with the ratio H1 / H2 of the height H1 of the second connecting structure 1211 to the height H2 of the connecting member 12. Examples 8, 9, and 10 satisfy the H1 / H2 range of 0.75 to 1. Examples 11 to 15 designed with the ratio W1 / W2 of the distance W1 between the support beam 11 and the edge of the box body 110 to the maximum width W2 of the box body 110. Examples 12, 13, and 14 satisfy the W1 / W2 range of 0.35 to 0.72.

[0087] Test method:

[0088] 1) Battery pack Z-direction first-order modal test:

[0089] Fix the battery pack on the test bench and arrange acceleration and amplitude sensors. In a 25°C environment, use an acceleration of 0.5g and perform a sinusoidal frequency sweep of 5 to 250Hz in the Z direction of the battery pack at a sweep rate of 1.0 oct / min. The frequency at which the battery pack produces the maximum amplitude is recorded as the first-order Z-direction mode of the battery pack.

[0090] 2) Connector structural strength:

[0091] The tensile testing machine can apply a constant load to the connector 12 and record the elongation and stress of the connector 12 under different loads, thereby obtaining the structural strength (tensile strength) of the connector 12.

[0092] The above test methods were used to test each embodiment, and the results were as follows:

[0093] Table 1

[0094] Table 1 shows that when the ratio D1 / D2 of the aperture D1 of the second connecting structure 1211 to the outer diameter D2 of the vertical portion 122 is less than 0.28 (Example 1) or greater than 0.67 (Example 5), the structural strength (tensile strength) of the connector 12 and the modal state of the battery pack are both low, which is detrimental to the structural stability of the battery pack. Therefore, the value range of D1 / D2 should satisfy 0.28≤D1 / D2≤0.67.

[0095] Table 1 shows that when the ratio H1 / H2 of the height H1 of the second connection structure 1211 to the height H2 of the connector 12 is 0.4 but less than 0.75 (Examples 6 and 7), the structural strength (tensile strength) of the connector 12 and the modal state of the battery pack are both low, which is detrimental to the structural stability of the battery pack. Therefore, the value range of H1 / H2 should satisfy 0.75≤H1 / H2≤1.

[0096] Table 1 shows that when the ratio (W1 / W2) of the distance (W1) between the support beam 11 and the edge of the box body 110 to the maximum width (W2) of the box body 110 is less than 0.35 (Example 11) or greater than 0.72 (Example 5), the battery pack modal state is low, which is detrimental to the structural stability of the battery pack. Therefore, the value range of W1 / W2 should satisfy the following: 0.35 ≤ W1 / W2 ≤ 0.72. The gravimetric energy density of a battery pack can be specifically the ratio of the total charge of the battery pack to the total weight of the battery pack.

[0097] In summary, the battery pack according to the embodiment of the present application can at least include the following advantages:

[0098] In an embodiment of the present application, a first mounting structure is provided on the upper cover of the battery pack, and the battery pack can be connected to the chassis of the vehicle through the first mounting structure. In addition, the battery pack may also include a connector that can pass through the upper cover and be detachably connected to the support beam on the box body. In actual applications, the connector can also be used to connect to the chassis of the vehicle to achieve dual fixation of the battery pack. In this way, the overall rigidity of the battery pack can be improved, the impact resistance of the battery pack can be enhanced, and the safety and overall stability of the battery pack under harsh working conditions can be improved.

[0099] An embodiment of the present application further provides a vehicle, which may specifically include: a chassis and any one of the above-mentioned battery packs; wherein the battery pack is connected to the chassis, specifically, the end of the fastener 13 facing away from the connector 12 is connected to the chassis.

[0100] It should be noted that in the embodiment of the present application, the structure of the battery pack is the same as the structure of the battery pack in any of the above embodiments, and its beneficial effects are also similar, which will not be described in detail here.

[0101] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack, wherein: The battery pack comprises: Upper cover (10); The box body (110) has a first direction (x), a second direction (y) and a third direction (z) intersecting in pairs, and a support beam (11) is provided on the box body (110), and the support beam (11) is connected to the upper cover (10); A connecting piece (12), one end of which passes through the upper cover (10) and is detachably connected to the supporting beam (11); A fastener (13), wherein the fastener (13) is detachably connected to an end of the connecting member (12) that is away from the support beam (11) so as to connect the battery pack to the vehicle.

2. The battery pack according to claim 1, wherein: The box body (110) and the upper cover (10) are arranged along the first direction (x); The support beam (11) is arranged in the central area of ​​the upper cover (10) and is connected to a side of the upper cover (10) close to the box body (110) along the first direction.

3. The battery pack according to claim 1, wherein: The connecting member (12) comprises a horizontal portion (121) and a vertical portion (122); The vertical portion (122) passes through the upper cover (10) and is connected to the support beam (11), and the horizontal portion (121) is connected to one end of the vertical portion (122) and abuts against a side of the upper cover (10) facing away from the support beam (11).

4. The battery pack according to claim 3, wherein: A second connection structure (1211) is provided on a side of the horizontal portion (121) away from the vertical portion (122), and the second connection structure (1211) is detachably connected to the fastener (13).

5. The battery pack according to claim 4, wherein: The second connection structure (1211) is any one of a second threaded hole, a buckle or a stud.

6. The battery pack according to claim 4, wherein: A first groove (1212) is provided on a side of the horizontal portion (121) away from the vertical portion (122); The second connection structure (1211) is arranged at the bottom of the first groove (1212), and the second connection structure (1211) is connected to the first groove (1212) and extends in a direction away from the first groove (1212).

7. The battery pack according to claim 4, wherein: The aperture of the second connection structure (1211) is D1 mm, and the outer diameter of the vertical portion (122) is D2 mm, satisfying: 0.28≤D1 / D2≤0.

67.

8. The battery pack according to claim 4, wherein: The vertical portion (122) extends along the first direction (x), and the second connecting structure (1211) extends along the first direction (x); the height of the second connecting structure (1211) along the first direction (x) is H1 mm, and the height of the vertical portion (122) along the first direction (x) is H2 mm, satisfying: 0.75≤H1 / H2≤1.

9. The battery pack according to claim 3, wherein: The battery pack further comprises a sealing member (14), wherein the sealing member (14) is arranged between the connecting member (12) and the upper cover (10) so as to achieve a sealed connection between the connecting member (12) and the upper cover (10).

10. The battery pack according to claim 9, wherein: A second groove (1213) is provided on one side of the horizontal portion (121) close to the vertical portion (122), and the sealing member (14) is embedded in the second groove (1213).

11. The battery pack according to claim 9, wherein: The sealing member (14) is any one of a sealing ring, a sealing rubber strip or a sealing foam member.

12. The battery pack according to claim 1, wherein: The number of the connecting members (12) is plural, and the connecting members (12) are arranged at intervals along the second direction (y).

13. The battery pack according to claim 1, wherein: The number of the support beams (11) is multiple, and the multiple support beams (11) are arranged at intervals along the third direction (z).

14. The battery pack according to claim 13, wherein: Along the third direction (z), the maximum distance between the support beam (11) at the end and the edge of the box body (110) is W1 mm, and the maximum width of the box body (110) along the third direction (z) is W2 mm, satisfying: 0.35≤W1 / W2≤0.

72.

15. The battery pack according to claim 1, wherein: The upper cover (10) is provided with a first mounting structure (101) distributed in the circumferential direction, and the first mounting structure (101) is connected to the box body (110) and is used for detachable connection with the vehicle.

16. A vehicle, wherein: The vehicle comprises: a chassis and a battery pack according to any one of claims 1 to 15; wherein an end of the fastener (13) facing away from the connecting member (12) is connected to the chassis.

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