Battery pack shell and battery pack with same

Abstract

The invention relates to the field of battery packs, in particular to a battery pack shell and a battery pack with the battery pack shell, and the battery pack shell comprises a battery pack frame; the battery pack frame comprises an external frame, the external frame comprises four external boundary beams, and at least one external boundary beam in the battery pack shell is provided with a connector; the connector is connected with an external boundary beam through the connecting plate assembly; the connecting plate assembly comprises a connecting plate body, and a rivet nut is arranged on the connecting plate body; mounting through holes are formed in the external boundary beams; the connector is connected to an external boundary beam through the connecting plate assembly; according to the invention, through the arrangement of the connecting plate assembly, the connecting plate assembly plays a good role in bridging, so that the connection of the connector on an external boundary beam is facilitated; the rivet nuts can be replaced and maintained conveniently after being damaged; and the trouble that the connector is connected to the external boundary beam after the rivet nuts are damaged is avoided.

Description

Technical Field

[0001] The present invention relates to the field of battery packs, and in particular to a battery pack shell and a battery pack having the battery pack shell. Background Art

[0002] Ordinary cars burn gasoline, and their emissions contain a lot of exhaust gas.

[0003] New energy vehicles usually refer to vehicles that are powered by electricity. They have no emissions and are environmentally friendly. As the country's environmental protection requirements become increasingly stringent, in order to reduce pollution, the national strategic requirements of carbon peak and carbon neutrality have been put forward, and the production of fuel vehicles has been gradually reduced or even stopped, and the production of new energy vehicles has been increased. New energy vehicles have become the future development trend.

[0004] Existing new energy electric vehicles do not have engines and need to be powered by batteries. Generally, battery packs are used to provide electricity to drive the vehicle.

[0005] Most existing battery packs use aluminum profile boxes or rolled steel boxes. When the connector is connected to the box, it is necessary to press rivet blind nuts inside the profile or rolled steel parts to connect, while ensuring the sealing of the box.

[0006] However, due to the requirement of lightweight battery packs, the battery pack box profiles are currently made relatively thin, and the riveting strength and sealing of the rivet nuts are difficult to guarantee.

[0007] In addition, the requirement of transportation or electrophoresis after welding causes some rivet nuts to become ineffective or fall off and leak.

[0008] Damage to the rivet nut will affect the installation of the connector on the external side beam; however, after the shell structure in the battery pack is welded, it is large in size and requires larger equipment for rework, which has high requirements on the tooling size, which means it is not easy to rework.

[0009] Therefore, in the traditional use process, the damaged area of ​​the rivet nut is mostly sealed by gluing. This operation method will increase the working hours and material costs, resulting in waste of resources.

[0010] Moreover, the next step of gluing can only be carried out after the glue is cured, which seriously affects the efficiency of product rework. If the glue after rework is unevenly applied or affected by gravity, there will be problems with poor sealing.

[0011] The existing patent CN112757885A - A method for improving the versatility of the connection structure between the middle mounting point of a battery pack and the vehicle body - does not clearly disclose the technical content for solving the above-mentioned problems.

[0012] In order to improve or solve at least one of the above problems, it is necessary to optimize the design of the existing battery pack structure. Summary of the invention

[0013] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a battery pack housing that is easy to replace after a rivet nut is damaged.

[0014] In order to achieve the above object, the technical solution adopted by the present invention is:

[0015] A battery pack housing, comprising a battery pack frame, the battery pack frame; the battery pack frame comprises an external frame, the external frame comprises four external side beams, the four external side beams are sequentially connected to form a U-shaped distribution; each of the external side beams comprises a side beam body;

[0016] A connector is provided on at least one external side beam in the battery pack housing; the connector is connected to the external side beam via a connecting plate assembly;

[0017] The connecting plate assembly comprises a connecting plate body, on which a rivet nut is arranged; the external side beam is provided with a mounting through hole; and the connector is connected to the external side beam through the connecting plate assembly.

[0018] A nut mounting hole is provided on the connecting plate body, and the rivet nut is connected in the nut mounting hole; a plug-in bolt is provided in the mounting through hole; the plug-in bolt passes through the mounting through hole on the external side beam and is connected to the rivet nut on the connecting plate assembly.

[0019] The connecting plate body is provided with a sealing gasket, the sealing gasket is attached to the connecting plate body, and the connecting plate body is attached to the external side beam through the sealing gasket.

[0020] The rivet nut comprises a nut body, on which a nut head is arranged; the outer diameter of the nut head is larger than the outer diameter of the nut body at the maximum point; the vertical cross-section of the rivet nut is T-shaped; and a sealing layer is arranged at the connection between the nut head and the nut body.

[0021] A battery pack comprises the battery pack shell, wherein a PTC device and a battery cell structure are arranged in the battery pack shell; the battery cell structure is arranged on the PTC device and fixed on a battery pack frame in the battery pack shell;

[0022] The PTC device includes a plurality of heating units, each of which includes a heating mechanism and a supporting mechanism; the heating mechanism is connected to the battery pack housing through the supporting mechanism;

[0023] The heating mechanism comprises an aluminum plate, and a PTC heating core is arranged on the aluminum plate;

[0024] The support mechanism includes a support plate; the aluminum plate is arranged on the support plate; and the support plate is connected to the battery pack housing.

[0025] The side beam body is hollow inside to form a material reduction channel; the side beam body includes a longitudinal side beam and a transverse side beam; the transverse side beam and the longitudinal side beam are staggered;

[0026] The battery pack frame also includes a central support beam, which includes a central beam body. The central beam body is hollow inside to form a central material reduction channel; the central beam body includes a central longitudinal beam and a central cross beam; the central longitudinal beam is arranged perpendicular to the central cross beam, and the vertical cross section of the central beam body is an inverted T shape; the lower end surface of the central cross beam and the lower end surface of the transverse side beam are on the same plane.

[0027] When adjacent external side beams are overlapped, a clamping groove is provided at the end of one external side beam, and the transverse side beam in the other external side beam is clamped on the adjacent external side beam through the clamping groove; the clamping groove is at the same height as the transverse side beam.

[0028] The battery cell structure includes multiple battery cell modules; the multiple battery cell modules are distributed in the battery pack shell; the battery cell module includes a battery cell unit, and a module end plate is provided at the end of the battery cell unit, and the module end plate is connected to the battery pack shell through a fastening component, and the fastening component includes a connecting bolt; the connecting bolt passes through the module end plate and is fixedly connected to the battery pack shell.

[0029] The battery pack further includes a bridging mechanism, which includes a bridging plate, and the bridging plate is overlapped on at least two battery cell modules; the fastening component passes through the bridging plate and is connected to the corresponding battery cell module.

[0030] The bridge plate includes a longitudinal connecting plate; a transverse support plate is provided on the longitudinal connecting plate, and the bridge plate is overlapped on the module end plate of the corresponding battery cell module through the transverse support plate; the longitudinal connecting plate and the transverse support plate are arranged perpendicular to each other; positioning grooves are provided at the corners of the module end plate; the transverse support plate of each bridge plate is embedded in the positioning groove of the adjacent module end plate; the longitudinal connecting plate is attached to the outer side of the module end plate.

[0031] The advantages of the present invention are:

[0032] The invention discloses a battery pack shell and a battery pack having the battery pack shell.

[0033] The present invention provides a connecting plate assembly, which plays a good bridging role, facilitates the connection of the connector on the external side beam, and also facilitates the replacement and repair of the rivet nut after it is damaged.

[0034] At the same time, the present invention can avoid the trouble of directly connecting the connector to the external side beam through the provision of the connecting plate assembly, and avoid the trouble of connecting the connector to the external side beam when the rivet nut is damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The following is a brief description of the contents expressed in the drawings of the present invention and the symbols in the drawings:

[0036] Figure 1 It is a schematic diagram of the structure of the battery pack frame in the present invention.

[0037] Figure 2 This is a schematic diagram of the structure of the battery pack frame in the present invention without the external side beam on one side.

[0038] Figure 3 It is a schematic structural diagram of the external side beam with a connector from the first perspective in the present invention.

[0039] Figure 4 It is a structural schematic diagram of the external side beam with a connector from a second viewing angle in the present invention.

[0040] Figure 5 It is a schematic structural diagram of the external side beam in the present invention.

[0041] Figure 6 It is a structural schematic diagram of the connecting plate assembly in the present invention from a first viewing angle.

[0042] Figure 7 It is a structural schematic diagram of the connecting plate assembly in the present invention from a second viewing angle.

[0043] Figure 8 It is a structural schematic diagram of the connecting plate body in the present invention.

[0044] Fig. 9 It is a schematic diagram of the structure of the rivet nut in the present invention.

[0045] Fig.10 It is a schematic diagram of the structure of the PTC device in the present invention.

[0046] Fig.11 It is a schematic diagram of the structure of the aluminum plate in the present invention.

[0047] Fig.12 It is a partial enlarged view of the aluminum plate in the present invention.

[0048] Fig.13 It is a structural schematic diagram of the support plate in the present invention.

[0049] Fig.14 It is a side view of the heating unit in the present invention.

[0050] Fig.15 It is a schematic diagram of the structure of the battery pack assembly in the present invention.

[0051] Fig.16 It is a structural schematic diagram of a battery core structure connected with a fastening component in the present invention.

[0052] Fig.17 for Fig.16 A partial enlarged view of the .

[0053] The marks in the above figure are:

[0054] 1. PTC device, 2. Battery pack shell, 3. Battery cell structure, 4. Bridge plate, 5. Connecting bolts. DETAILED DESCRIPTION

[0055] The specific implementation of the present invention will be further explained in detail below by describing the optimal embodiment with reference to the accompanying drawings.

[0056] A battery pack shell, including a battery pack frame, the battery pack frame; the battery pack frame includes an external frame, the external frame includes four external side beams, and the four external side beams are connected in sequence to form a U-shaped distribution; each of the external side beams includes a side beam body; at least one external side beam in the battery pack shell is provided with a connector; the connector is connected to the external side beam through a connecting plate assembly; the present invention provides a connecting plate assembly, and the connecting plate assembly plays a good bridging role, which facilitates the connection of the connector to the external side beam; it also facilitates the replacement and repair of the rivet nut after it is damaged; at the same time, the present invention can avoid the trouble of directly connecting the connector to the external side beam through the setting of the connecting plate assembly, and avoid the trouble of connecting the connector to the external side beam when the rivet nut is damaged.

[0057] At the same time, the battery pack frame described in the present invention includes an external frame, and the external frame includes four external side beams 21, and the four external side beams 21 are connected in sequence to form a U-shaped distribution; in the present invention, the four external side beams 21 are connected in sequence to form a frame structure with a horizontal projection of a U-shaped shape; the external side beams 21 disclosed in the present invention are rolled profiles, and their own structural strength is relatively large, which is beneficial to ensure the overall structural strength of the shell mechanism. At the same time, in the present invention, the sizes of the four external side beams 21 are designed according to needs, and generally two relatively parallel external side beams 21 have the same size; during actual assembly, the outer shell mechanism can be designed as a cuboid structure or a cube structure; it can be specifically designed according to needs.

[0058] In addition, in the present invention, the external side beams 21 are connected by welding, or by a detachable connection.

[0059] In addition, in the present invention, a connector 22 is provided on at least one external side beam 21 in the battery pack shell 2; the connector 22 is connected to the external side beam 21 through a connecting plate assembly 202; the connecting plate assembly 202 includes a connecting plate body 2021, and a rivet nut 2022 is provided on the connecting plate body 2021; a mounting through hole is provided on the external side beam 21; the connector 22 is connected to the external side beam 21 through the connecting plate assembly 202; the connecting plate assembly 202 of the present invention acts as a connector and a bridge, which facilitates the installation of the connector 22 on the corresponding external side beam 21.

[0060] In the present invention, a connector 22 is provided on the external side beam 21 at the front end and the rear end of the battery; in the present invention, the connector 22 is connected to the external side beam 21 through a connecting plate assembly 202; the connecting plate assembly 202 includes a connecting plate body 2021, and a rivet nut 2022 is provided on the connecting plate body 2021; a mounting through hole is provided on the external side beam 21; the connector 22 is connected to the external side beam 21 through the connecting plate assembly 202; the present invention provides a good bridging effect through the setting of the connecting plate assembly 202, which facilitates the connection of the connector 22 to the external side beam 21; at the same time, the present invention can avoid the trouble of directly connecting the connector 22 to the external side beam 21 through the setting of the connecting plate assembly 202.

[0061] In the traditional installation method, the rivet nut 2022 is generally directly connected to the external side beam 21. The rivet nut 2022 is easy to fail or be damaged during the transportation or processing of the shell structure, and the damage of the rivet nut 2022 will affect the installation of the connector 22 on the external side beam 21; however, after the shell structure in the battery pack is welded, due to its large size, larger equipment is required for rework, and the tooling size requirements are high, which means it is not easy to rework.

[0062] Therefore, in the traditional use process, the damaged area of ​​the rivet nut 2022 is mostly sealed with glue. This operation method will increase the working hours and material costs and cause waste of resources.

[0063] Moreover, the next step of gluing can only be carried out after the glue is cured, which seriously affects the efficiency of product rework. If the glue after rework is unevenly applied or affected by gravity, there will be problems with poor sealing.

[0064] Therefore, in order to solve the above-mentioned problem, the present invention connects the connector 22 and the external side beam 21 through a connecting plate assembly 202. Even when a rivet nut 2022 is damaged, the overall size of the connecting plate assembly 202 is small, which is convenient for rework and maintenance on the machine tool and replacement of a new rivet nut 2022.

[0065] In the present invention, the connecting plate assembly 202 includes a connecting plate body 2021, on which a rivet nut 2022 is provided; the external side beam 21 is provided with a mounting through hole 211; the connector 22 is connected to the external side beam 21 through the connecting plate assembly 202; in the present invention, the connecting plate body 2021 is a flat plate structure, and a nut mounting hole is provided on the connecting plate body 121, and the rivet nut 2022 is connected in the nut mounting hole; subsequently, the mounting through hole 211 on the external side beam 21 is passed through the plug-in bolt 201 to connect with the rivet nut 2022 on the connecting plate assembly 202, thereby realizing the connection of the connecting plate assembly 202 on the external side beam 21; at the same time, the connector 22 can also be directly connected to the external side beam 21 through the plug-in bolt 201.

[0066] At the same time, in order to ensure the sealing between the connecting plate assembly 202 and the external side beam 21, a sealing gasket is provided on the connecting plate body 2021 in the present invention, and the sealing gasket is attached to the connecting plate body 2021. The setting of the sealing gasket plays a good connection sealing role, thereby ensuring the sealing between the connecting plate assembly 202 and the external side beam 21.

[0067] At the same time, in the present invention, the rivet nut 2022 includes a nut body 2-1, and a nut head 2-2 is provided on the nut body 2-1; the outer diameter of the nut head 2-2 is larger than the outer diameter of the nut body 2-1 at the maximum point; the vertical cross-section of the rivet nut 2022 is T-shaped; a sealing layer is provided at the connection between the nut head 2-2 and the nut body 2-1; the T-shaped structure of the rivet nut 2022 itself has a limiting function, which ensures the stability of the arrangement of the rivet nut 2022 on the connecting plate body 2021; at the same time, the sealing layer 2-3 is arranged at the connection between the nut head 2-2 and the nut body 2-1, and when the rivet nut 2022 is deformed later, the sealing layer 2-3 can fill the gap between the rivet nut 2022 and the connecting plate body 2021, thereby optimizing the sealing effect; in addition, in the present invention, the nut head 2-2 plays a good blocking and limiting role, thereby avoiding excessive extrusion pressure between the connecting plate body 2021 and the external side beam 21 during subsequent assembly, thereby causing the sealing gasket to lose its elasticity.

[0068] A battery pack assembly includes a battery pack shell 2; the battery pack shell 2 includes a battery pack frame, and the battery pack frame is provided with the PTC device 1; the battery cell structure 3 is arranged on the PTC device 1 and fixed on the battery pack frame; the PTC device 1 disclosed in the present invention heats the battery cell structure 3 in the battery pack in the form of a PTC plus a silicone pad, which can greatly improve the heating rate. At the same time, the PTC device 1 is arranged at the bottom of the battery cell structure 3, and the stability of the arrangement of the battery cell structure 3 in the battery pack shell 2 can also be ensured.

[0069] The PTC device in the present invention mainly includes multiple heating units 1-1, each heating unit 1-1 includes a heating mechanism and a supporting mechanism; the heating mechanism is connected to the battery pack shell 2 through the supporting mechanism; the present invention can heat the battery pack through the use of the PTC device 1 to ensure the use effect of the battery pack.

[0070] The plurality of heating units 1 - 1 are distributed at intervals.

[0071] The PTC device 1 disclosed in the present invention is mainly used to heat the battery cell structure 3 in the battery pack.

[0072] The PTC device 1 disclosed in the present invention comprises a plurality of heating units 1-1, each of which comprises a heating mechanism and a supporting mechanism; the heating mechanism is connected to the battery pack shell 2 via the supporting mechanism; the heating mechanism heats up when powered on to achieve a temperature increase operation on the battery cell structure 3, and the supporting mechanism has one function of supporting the heating mechanism and another function of supporting the battery cell, while better ensuring the contact stability between the battery cell structure 3 and the heating mechanism.

[0073] In the present invention, the heating mechanism comprises an aluminum plate 12, on which a PTC heating core is disposed; in the present invention, the PTC heating core may be a PTC heating core with an electrode at one end; and it is energized to generate heat during subsequent use.

[0074] In addition, the use of the aluminum plate 12 in the present invention enables the heating mechanism to have good thermal conductivity, and the supporting mechanism in the present invention includes a supporting plate 11; the aluminum plate 12 is arranged on the supporting plate 11; the supporting plate 11 is connected to the battery pack shell 2; the supporting plate 11 is a connecting member and a supporting member, which is convenient for supporting and placing the battery cell structure 3.

[0075] Furthermore, in the present invention, the aluminum plate 12 and the support plate 11 are connected via a plug-in mechanism. The provision of the plug-in mechanism can achieve installation and fixation between the aluminum plate 12 and the support plate 11, and at the same time, facilitate installation and positioning of the aluminum plate 12. Because in actual design, the length of the aluminum plate 12 is shorter than the support plate 11, if no additional fixing mechanism is added, the aluminum plate 12 will deviate or shake in the battery pack shell 2, causing abnormal noise in the battery pack. In order to avoid the above-mentioned problem, the present invention is provided with a plug-in mechanism, which plays a good limiting role and avoids installation positioning of the aluminum plate 12.

[0076] Specifically, the plug-in mechanism in the present invention includes a plurality of plug-in parts. The arrangement of the plug-in parts enables the aluminum plate 12 to be plugged into the support plate 11. Such a design can achieve the connection between the aluminum plate 12 and the support plate 11 and facilitate the limitation of the position of the aluminum plate 12 itself.

[0077] In addition, in the present invention, each of the plug-in parts includes a plug-in column 124 arranged on the aluminum plate 12 and a plug-in hole arranged on the support plate 11, and the plug-in column 124 is plugged into the support plate 11 through the plug-in hole; generally, at least two plug-in parts are provided on the aluminum plate 12, and each plug-in part is distributed at intervals. The plug-in column 124 can be a stepped column structure or a smooth cylindrical structure, which can be selected according to needs.

[0078] Furthermore, in the present invention, the aluminum plate 12 includes a plate body 121, which is the main structure of the aluminum plate 12, and a laying block 122 is provided on the plate body 121. The laying block 122 is a raised block, which can not only ensure the structural strength of the aluminum plate 12, but also can be used for the placement and protection of the PTC heating core. Specifically, in the present invention, the laying block 122 is hollow inside to form a connecting channel 123; the connecting channel 123 provides a place for placing the PTC heating core.

[0079] At the same time, in the present invention, a plurality of reinforcing ribs 126 are also provided on the plate body 121; the plurality of reinforcing ribs 126 are symmetrically distributed on both sides of the paving block 122; the setting of the reinforcing ribs 126 has one function of increasing the structural strength of the aluminum plate 12, and another function of providing a good support to prevent the aluminum plate 12 from tipping over laterally.

[0080] At the same time, in the present invention, the height of the plug-in column 124 is greater than the thickness of the laying block 122 and the reinforcing rib 126; such a setting allows the plug-in column 124 to be plugged into the groove of the bottom guard plate 23 to ensure the supporting force of the lower end of the aluminum plate 12.

[0081] Furthermore, in the present invention, the support plate 11 includes a support plate body; the support plate body is the main structure of the support plate 11, and in the present invention, the support plate body includes a substrate 111; lap plates 112 are provided on both sides of the substrate 111, and each lap plate 112 is connected to the substrate 111 through a connecting plate 113; the lap plates 112 and the substrate 111 are parallel and staggered to each other; the connecting plate 113 is arranged perpendicular to the substrate 111 and the lap plates 112 at the same time; in the present invention, the lap plates 112 on both sides are in contact with the aluminum plate 12 to play a good supporting role, and the coordinated use of the substrate 111, the connecting plate 113 and the lap plates 112 makes the support plate 11 an inverted "X"-shaped structure, that is, the support does not form a groove structure, which is convenient for the placement and arrangement of the laying blocks 122 and the reinforcing ribs 126 on the aluminum plate 12, and at the same time, it is also convenient for the placement and arrangement of the heating mechanism.

[0082] Furthermore, in the present invention, a silicone pad is laid on the side of the plate body 121 of the aluminum plate 12 away from the support plate 11; the silicone pad can not only play a good supporting and buffering role, but the silicone pad disclosed in the present invention is also a thermally conductive silicone pad, which optimizes heat transfer.

[0083] In addition, in the present invention, a supporting foam 125 is provided between the base plate 111 and the laying block 122 ; the supporting foam 125 plays a good supporting and protective role, while avoiding a rigid collision between the aluminum plate 12 and the supporting plate 11 .

[0084] In the present invention, the basic function of the PTC device 1 is to heat the battery cell structure 3 to ensure that the battery pack has a good use effect in winter; another function is to play a good supporting role to ensure the stability of the arrangement of the battery cell structure 3 in the battery pack shell 2.

[0085] In the present invention, the battery pack assembly mainly includes a battery pack shell 2; the battery pack shell 2 is an external protective structure of the battery pack assembly, and the main body is a box structure.

[0086] In the present invention, the battery pack housing 2 includes a battery pack frame, which is the main structure of the battery pack housing 2. A bottom guard plate 23 is provided at the bottom of the battery pack frame, and a box cover is provided at the upper end of the battery pack frame.

[0087] At the same time, in the present invention, each of the external side beams 21 includes a side beam body 2011; the side beam body 2011 is hollow inside to form a material reduction channel; this makes the external side beam 21 equivalent to an internal hollow box structure, which is beneficial to the overall lightweight of the battery pack.

[0088] In the present invention, the side beam body 2011 includes a longitudinal side beam 211 and a transverse side beam 212; the transverse side beam 212 is distributed on the side of the longitudinal side beam 211. This arrangement makes the side beam body 2011 as a whole similar to an L-shaped structure. This arrangement not only facilitates the overlapping of the battery cell mechanism during subsequent use, but also facilitates the overlapping of the subsequent PTC device.

[0089] In addition, it should be noted that the transverse side beam 212 and the longitudinal side beam 211 described in the present invention are staggered; the staggered distribution here mainly refers to the lower end surface of the transverse side beam 212 close to the bottom guard plate 23 of the battery pack assembly and the lower end surface of the longitudinal side beam 211 close to the bottom guard plate 23 of the battery pack are on two planes; this forms a step at the connection between the transverse side beam 212 and the longitudinal side beam 211, thereby forming a placement space, which is convenient for the overlap of the support plate 11 on the battery pack frame, while also avoiding affecting the flatness of the bottom of the battery pack, and avoiding the bottom guard plate 23 from tilting due to the setting of the support plate 11; at the same time, the step formed above can also be used for installation limiting the end of the support plate 11.

[0090] In addition, the above-mentioned transverse side beams 212 also play a good overlapping role, which facilitates the overlapping installation of the battery cell structure 3 and the support plate 11.

[0091] In addition, the battery pack frame described in the present invention also includes a middle support beam, which plays a role of middle pressure reinforcement to ensure the middle structural strength of the battery pack frame.

[0092] At the same time, the middle support beam in the present invention includes a middle beam body 204, and the middle beam body 204 is hollow inside to form a middle material reduction channel; such a configuration also makes the middle support beam a box structure with a hollow interior, thereby achieving lightweight of the middle support beam.

[0093] At the same time, in the present invention, the middle beam 204 includes a middle longitudinal beam 241 and a middle cross beam 242; the middle longitudinal beam 241 is arranged perpendicular to the middle cross beam 242, and the vertical cross section of the middle beam 204 is an inverted T shape; based on such a setting, a stepped platform is formed at both ends of the middle beam 204, and such a setting facilitates the overlapping installation of the battery cell mechanism; at the same time, it also facilitates the overlapping installation of the subsequent BDU assembly or BMS assembly.

[0094] In addition, in the present invention, the lower end surface of the middle cross beam 242 and the lower end surface of the transverse side beam 212 are on the same plane; such a setting can avoid the setting of the middle cross beam 242 and cause the support plate 11 to be arranged tilted, which is beneficial to ensure the flatness of the battery pack.

[0095] Furthermore, in the present invention, when adjacent external side beams 21 are overlapped, a clamping groove 213 is provided at the end of one external side beam 21, and the transverse side beam 212 in the other external side beam 21 is clamped on the adjacent external side beam 21 through the clamping groove 213; based on such a setting, the overlapping installation between the external side beams 21 can be achieved, which can not only ensure the stability of the installation between the external side beams 21, but also increase the contact area between the external side beams 21, and better ensure the stability of the connection of the external side beams 21. In the subsequent connection, the adjacent external side beams 21 are connected by welding, thereby ensuring the stability of the connection between the external side beams 21.

[0096] At the same time, in the present invention, the snap-in groove 213 is at the same height as the transverse side beam 212; based on such a setting, the present invention facilitates the snap-in between adjacent external side beams 21, while ensuring the flatness of the bottom of the battery pack frame composed of the external side beams 21, so that the external side beams 21 have obvious mutual positioning effect.

[0097] Furthermore, in the present invention, the battery cell structure 3 includes multiple battery cell modules 31; the multiple battery cell modules 31 are distributed in the battery pack shell 2; the specific number and arrangement of the battery cell modules 31 can be designed according to needs; in the present invention, the battery cell module 31 includes a battery cell unit, and a module end plate 32 is provided at the end of the battery cell unit, and the module end plate 32 is connected to the battery pack shell 2 through a fastening component. The setting of the fastening component allows the battery cell module 31 to be directly fixed on the battery pack shell 2, thereby ensuring the stability of the arrangement of the battery cell module 31 in the battery pack.

[0098] In addition, in the present invention, one end of the battery cell module 31 is overlapped on the transverse side beam 212 of the external side beam 21 arranged at one end, and the other end is overlapped on the middle cross beam 242; subsequently, each module end plate 32 in each battery cell module 31 is fixed to the corresponding transverse side beam 212 or the middle cross beam 242 by at least two fastening components; such a design facilitates the fixed installation of the battery cell structure 3 in the battery pack shell 2.

[0099] In the present invention, the fastening component includes a connecting bolt 5; the connecting bolt 5 passes through the module end plate 32 and is fixedly connected to the battery pack shell 2; a through hole is provided on the module end plate 32, and the connecting bolt 5 passes through the through hole on the module end plate 32 in the longitudinal direction and is connected to the battery pack shell 2.

[0100] Furthermore, the battery pack in the present invention also includes a bridging mechanism. The setting of the bridging mechanism plays a good connection role and ensures a stable connection between adjacent or at least two battery cell modules 31.

[0101] In the present invention, the bridging mechanism includes a bridging plate 4, which is overlapped on at least two battery cell modules 31; the fastening component passes through the bridging plate 4 and is connected to the corresponding battery cell module 31; the bridging plate 4 is a plate structure, which plays a good bridging and connecting role, and facilitates the fixed connection between adjacent battery cell modules 31; based on such a setting, the integrity of the battery cell structure 3 is guaranteed.

[0102] In addition, in the present invention, the bridging plate 4 includes a longitudinal connecting plate 42; a transverse supporting plate 41 is provided on the longitudinal connecting plate 42. In the present invention, the longitudinal connecting plate 42 is used for overlapping between the battery modules 31, and cooperates with the fastening components to realize the installation and fixation of the battery module 31.

[0103] At the same time, in the present invention, the bridging plate 4 is overlapped on the module end plate 32 of the corresponding battery module 31 through the transverse support plate 41; the longitudinal connecting plate 42 and the transverse support plate 41 are arranged perpendicular to each other; the longitudinal connecting plate 42 is attached to the outer side of the module end plate 32; the bridge plate of the present invention is an inverted L-shaped plate structure, which plays a good longitudinal and transverse limiting role, and can ensure the accurate assembly of adjacent or relative battery modules 31; and ensure the accuracy of the assembly position of the battery module 31.

[0104] Furthermore, in the present invention, positioning grooves 33 are provided at the corners of the module end plates 32; the transverse support plates 41 of each bridging plate 4 are embedded in the positioning grooves 33 of the adjacent module end plates 32; the positioning grooves 33 are an installation slot structure, which is convenient for lateral positioning of the transverse support plates 41 to avoid shaking of the battery cell module 31.

[0105] At the same time, in the present invention, the connection between the components is generally achieved by using the cooperation between the connecting bolts and the rivet nuts to achieve the installation and fixation between the two components.

[0106] Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, they are all within the protection scope of the present invention.

Claims

1. A battery pack housing, characterized in that: It includes a battery pack frame, the battery pack frame; the battery pack frame includes an external frame, the external frame includes four external side beams, the four external side beams are connected in sequence to form a U-shaped distribution; each of the external side beams includes a side beam body; A connector is provided on at least one external side beam in the battery pack housing; the connector is connected to the external side beam via a connecting plate assembly; The connecting plate assembly comprises a connecting plate body, on which a rivet nut is arranged; the external side beam is provided with a mounting through hole; and the connector is connected to the external side beam through the connecting plate assembly.

2. A battery pack housing according to claim 1, characterized in that; A nut mounting hole is provided on the connecting plate body, and the rivet nut is connected in the nut mounting hole; a plug-in bolt is provided in the mounting through hole; the plug-in bolt passes through the mounting through hole on the external side beam and is connected to the rivet nut on the connecting plate assembly.

3. A battery pack housing according to claim 1, characterized in that; The connecting plate body is provided with a sealing gasket, the sealing gasket is attached to the connecting plate body, and the connecting plate body is attached to the external side beam through the sealing gasket.

4. A battery pack housing according to claim 1, characterized in that; The rivet nut comprises a nut body, on which a nut head is arranged; the outer diameter of the nut head is larger than the outer diameter of the nut body at the maximum point; the vertical cross-section of the rivet nut is T-shaped; and a sealing layer is arranged at the connection between the nut head and the nut body.

5. A battery pack, characterized in that: A battery pack shell according to any one of claims 1 to 4, wherein a PTC device and a battery cell structure are provided in the battery pack shell; the battery cell structure is arranged on the PTC device and fixed on a battery pack frame in the battery pack shell; The PTC device comprises a plurality of heating units, each of which comprises a heating mechanism and a supporting mechanism; The heating mechanism is connected to the battery pack housing through a supporting mechanism; The heating mechanism comprises an aluminum plate, and a PTC heating core is arranged on the aluminum plate; The support mechanism includes a support plate; the aluminum plate is arranged on the support plate; and the support plate is connected to the battery pack housing.

6. A battery pack according to claim 5, characterized in that: The side beam body is hollow inside to form a material reduction channel; the side beam body includes a longitudinal side beam and a transverse side beam; the transverse side beam and the longitudinal side beam are staggered; The battery pack frame further includes a middle support beam, the middle support beam includes a middle beam body, the middle beam body is hollow inside to form a middle material reduction channel; the middle beam body includes a middle longitudinal beam and a middle cross beam; the middle longitudinal beam is arranged perpendicular to the middle cross beam, and the middle beam body has an inverted T-shaped vertical section; The lower end surface of the middle cross beam and the lower end surface of the transverse side beam are in the same plane.

7. A battery pack assembly according to claim 6, characterized in that: When adjacent external side beams are overlapped, a clamping groove is provided at the end of one external side beam, and the transverse side beam in the other external side beam is clamped on the adjacent external side beam through the clamping groove; the clamping groove is at the same height as the transverse side beam.

8. The battery pack assembly according to claim 6, characterized in that: The battery cell structure includes multiple battery cell modules; the multiple battery cell modules are distributed in the battery pack shell; the battery cell module includes a battery cell unit, and a module end plate is provided at the end of the battery cell unit, and the module end plate is connected to the battery pack shell through a fastening component, and the fastening component includes a connecting bolt; the connecting bolt passes through the module end plate and is fixedly connected to the battery pack shell.

9. A battery pack assembly according to claim 8, characterized in that: The battery pack further comprises a bridging mechanism, wherein the bridging mechanism comprises a bridging plate, and the bridging plate is overlapped on at least two battery cell modules; The fastening component is connected to the corresponding battery core module through the bridging plate.

10. A battery pack assembly according to claim 9, characterized in that: The bridge plate includes a longitudinal connecting plate; a transverse support plate is provided on the longitudinal connecting plate, and the bridge plate is overlapped on the module end plate of the corresponding battery cell module through the transverse support plate; the longitudinal connecting plate and the transverse support plate are arranged perpendicular to each other; positioning grooves are provided at the corners of the module end plate; the transverse support plate of each bridge plate is embedded in the positioning groove of the adjacent module end plate; the longitudinal connecting plate is attached to the outer side of the module end plate.

Images