Battery housing and battery pack

Abstract

Disclosed in the present application are a battery housing and a battery pack. The battery housing comprises a housing body, a housing cover and a cover assembly, wherein the housing body is provided with a battery compartment, and the battery compartment is configured to assemble battery units of the battery pack; the housing cover is connected to the housing body, and covers and seals the battery compartment; and the cover assembly is connected to the side of the housing cover away from the battery compartment, an electrical compartment is formed in the cover assembly, the electrical compartment is configured to assemble electrical units of the battery pack, and an opening communicating the battery compartment with the electrical compartment is provided in the area of the housing cover that corresponds to the electrical compartment.

Description

Battery box and battery pack

[0001] The present application claims priority to the Chinese patent application No. 2024223109915, filed on September 20, 2024, to the Chinese Patent Office, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, in particular to a battery box and a battery pack. BACKGROUND

[0003] With the continuous consumption of fossil energy, new energy has begun to be gradually popularized and used. One of the important media in new energy is the storage battery. The storage battery is applied to the use scene of electric vehicles. TECHNICAL PROBLEM

[0004] With the popularity of electric vehicles, range anxiety is mentioned more and more. Therefore, how to improve the energy density to increase the endurance of electric vehicles is an urgent situation to be solved at present. TECHNICAL SOLUTION

[0005] In a first aspect, the present application provides a battery box, which comprises a box body, a box cover and a shell cover assembly; the box body is provided with a battery compartment, which is configured to assemble a battery unit of a battery pack; the box cover is connected with the box body and covers the battery compartment; the shell cover assembly is connected with the side of the box cover away from the battery compartment, and the shell cover assembly forms an electrical compartment, which is configured to assemble an electrical unit of the battery pack, and the box cover is provided with an opening corresponding to the electrical compartment, which communicates the battery compartment and the electrical compartment.

[0006] In a second aspect, the present application provides a battery pack, which comprises: a battery unit, an electrical unit and the battery box according to any one of the above, the battery unit is assembled in the battery compartment of the battery box, the electrical unit is assembled in the electrical compartment of the battery box, and the battery unit and the electrical unit are electrically connected through the opening. ADVANTAGEOUS EFFECTS

[0007] The beneficial effects of the present application are that one side of the box cover is connected with the box body and forms a battery compartment, and the other side of the box cover is connected with the shell cover assembly and forms an electrical compartment. The battery compartment is configured to assemble a battery unit, the battery unit is arranged along the length direction and the width direction of the battery box, the electrical compartment is configured to assemble an electrical unit, and the electrical unit and the battery unit are arranged along the thickness direction of the battery box. In this way, the electrical unit does not occupy the installation space of the battery unit, and under the same volume, the battery box can install more battery units to improve the energy density of the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0008] FIG. 1 is a schematic diagram of the assembly structure of the battery pack according to an embodiment of the present application.

[0009] Fig. 2 is an exploded structural schematic diagram of the battery pack according to an embodiment of the present application;

[0010] Fig. 3 is a cross-sectional schematic diagram of the battery pack according to an embodiment of the present application;

[0011] Fig. 4 is a structural schematic diagram of the box cover according to an embodiment of the present application;

[0012] Fig. 5 is an internal structural schematic diagram of the battery pack according to an embodiment of the present application.

[0013] In the drawings, the reference signs have the following meanings:

[0014] The reference signs are explained as follows: battery cell 300, electrical unit 200, battery box 100, box 10;

[0015] Battery compartment 101, box cover 20, opening 201, boss 21, shell cover assembly 30, electrical compartment 301;

[0016] Surrounding frame 31, assembly port 312, top cover 32, sunroof 321, panel 33, socket 332;

[0017] Joint 34, first sealing ring 35, second sealing ring 36, third sealing ring 37, load-bearing beam 40;

[0018] Stiffening beam 50.

[0019] Embodiments of the present application

[0020] Please refer to Figs. 1-4, Fig. 1 is an assembly structural schematic diagram of the battery pack according to an embodiment of the present application, Fig. 2 is an exploded structural schematic diagram of the battery pack according to an embodiment of the present application, Fig. 3 is a cross-sectional schematic diagram of the battery pack according to an embodiment of the present application, and Fig. 4 is a structural schematic diagram of the box cover 20 according to an embodiment of the present application.

[0021] The battery pack provided by the embodiments of the present application comprises a battery unit 300, an electrical unit 200 and a battery box 100. The battery box 100 has a battery compartment 101 and an electrical compartment 301, and the battery box 100 has a thickness direction Z, a length direction X and a width direction Y which are perpendicular to each other. The length direction and the width direction are the directions in which the battery box 100 extends in a plane, and the thickness direction is the direction in which the battery box 100 thickens as a whole. Understandably, in the embodiments, the size of the battery box 100 is arranged to decrease in the length direction, the width direction and the thickness direction in turn, the battery compartment 101 and the electrical compartment 301 are arranged at intervals along the thickness direction of the battery box 100, the battery unit 300 is assembled in the battery compartment 101 of the battery box 100, the battery unit 300 is an energy storage unit of the battery pack, the battery unit 300 is composed of a plurality of single batteries, the electrical unit 200 is assembled in the electrical compartment 301 of the battery box 100, the electrical unit 200 is an auxiliary management unit of the battery pack, the electrical unit 200 is mainly configured to manage the battery unit 300, and the battery unit 300 and the electrical unit 200 are electrically connected through an opening 201.

[0022] The electrical unit 200 comprises a battery management system (BMS), a battery disconnect unit (BDU) and the like. The battery management system is mainly used for intelligently managing and maintaining each battery unit 300, monitoring the state of the battery, preventing overcharging and overdischarging of the battery, so as to prolong the service life of the battery. The main function of the battery disconnect unit is to receive electric energy from a charging system, and then control the speed and torque of the motor through a controller, so as to drive the automobile. At the same time, the battery driving unit also needs to monitor the state of the battery in real time, so as to ensure the safe operation of the battery.

[0023] Specifically, the battery box 100 comprises a box body 10, a box cover 20 and a shell cover assembly 30. The box body 10 is provided with the battery compartment 101 which is configured to assemble the battery unit 300 of the battery pack, the battery unit 300 is connected with the box body 10, and the battery compartment 101 can be rectangular, circular or irregular. The box cover 20 is connected with the box body 10 and covers the battery compartment 101, the shell cover assembly 30 is connected with the side of the box cover 20 away from the battery compartment 101, the shell cover assembly 30 is formed with the electrical compartment 301, the electrical compartment 301 and the battery compartment 101 are distributed on opposite sides of the box cover 20, the electrical compartment 301 is configured to assemble the electrical unit 200 of the battery pack, the box cover 20 is provided with the opening 201 which communicates the battery compartment 101 and the electrical compartment 301 in the region corresponding to the electrical compartment 301, the electric wires pass through the opening 201 to electrically connect the battery unit 300 and the electrical unit 200, and the pipelines pass through the opening 201 to connect the battery unit 300 and the electrical unit 200 together.

[0024] In the present embodiment, one side of the box cover 20 is connected with the box body 10 and forms a battery compartment 101, and the other side of the box cover 20 is connected with the shell cover assembly 30 and forms an electrical compartment 301. The battery compartment 101 is configured to accommodate battery units 300 arranged along the length and width directions of the battery box body 100, and the electrical compartment 301 is configured to accommodate electrical units 200 arranged along the thickness direction of the battery box body 100, so that the electrical units 200 do not occupy the mounting space of the battery units 300, and the battery box body 100 can accommodate more battery units 300 under the same volume, thereby improving the energy density of the battery pack.

[0025] In some embodiments, the box cover 20 protrudes towards the electrical compartment 301 to form a boss 21 configured to carry the electrical units 200. The boss 21 is concentrated in the area of the box cover 20 corresponding to the electrical compartment 301, and the boss 21 is higher relative to other areas of the box cover 20, so that the top surface of the boss 21 is farther away from the battery units 300. When the electrical units 200 are mounted on the top surface of the boss 21, the electrical units 200 can be farther away from the battery units 300 relative to the mounting on other areas of the box cover 20, and the boss 21 forms a buffer space, so that the box cover 20 is prevented from being pressed and deformed by the electrical units 200 to injure the battery units 300. In addition, the boss 21 is a protruding area of the box cover 20, thereby serving as a reinforcing rib to locally improve the strength of the box cover 20, thereby preventing the box cover 20 from being pressed and deformed by the electrical units 200. Further, the boss 21 forms a buffer space between the top surface of the boss 21 and the battery units 300, and sufficient safety space is left when screws are screwed on the boss 21 to mount the electrical units 200, so as to prevent the screws from injuring the battery units 300.

[0026] The boss 21 can not change the thickness of the box cover 20, and the boss 21 is formed on the box cover 20 by stamping, and the boss 21 is in a hollow state inside. The boss 21 can also change the local thickness of the box cover 20, and the boss 21 is formed on the box cover 20 by welding or die casting, and the boss 21 is in a solid state inside.

[0027] In some embodiments, the boss 21 is formed with a plurality of parallel and spaced long grooves, which can extend along the length direction of the boss 21 and then be spaced along the width direction of the boss 21, or which can extend along the width direction of the boss 21 and then be spaced along the length direction of the boss 21. The long grooves can have a V-shaped cross section, or a U-shaped cross section, or an arc-shaped cross section. The long grooves form channels on the boss 21, so that after the electrical unit 200 is installed on the boss 21, air can directly contact the electrical unit 200 and carry away heat along the long grooves. In addition, the plurality of long grooves function as reinforcing ribs, thereby further enhancing the structural strength of the boss 21.

[0028] In some embodiments, the boss 21 is formed with a plurality of spaced spherical grooves, which are locally recessed structures on the boss 21. The plurality of spherical grooves can be arranged in a rectangular shape, or in a circular ring shape, or in other regular or irregular shapes. The spherical grooves can have a V-shaped cross section, or a U-shaped cross section, or an arc-shaped cross section. The plurality of spherical grooves function as reinforcing ribs, thereby further enhancing the structural strength of the boss 21.

[0029] In some embodiments, the battery case 100 further comprises a plurality of load-bearing beams 40, which are arranged on the boss 21 and connected to the shell cover assembly 30. The plurality of load-bearing beams 40 can be arranged in parallel with each other, or can be arranged in a cross shape, or can be arranged in a net shape with some load-bearing beams 40 arranged in parallel with each other and some load-bearing beams 40 arranged in a cross shape. The load-bearing beams 40 span the boss 21 and the shell cover assembly 30, thereby sharing the weight borne by themselves to the shell cover assembly 30. For example, a heavy battery driving unit can be placed on the plurality of load-bearing beams 40, which transmit part of the weight of the battery driving unit to the shell cover assembly 30, so that the boss 21 and the shell cover assembly 30 jointly bear the weight of the battery driving unit, thereby sharing the pressure borne by the boss 21 and preventing the boss 21 from deforming. The load-bearing beams 40 can be sheet metal bending parts, or can be injection molded plastic parts.

[0030] Specifically, the shell cover assembly 30 comprises a frame 31 and a top cover 32, the frame 31 is connected with the box cover 20, an assembling opening 312 is formed at an end of the frame 31 away from the box cover 20, and the top cover 32 is connected with the frame 31 and covers the assembling opening 312. The connection between the frame 31 and the box cover 20 can be welding, bonding or other ways without the need of punching sharp objects towards the battery compartment 101. The frame 31 is arranged behind the box cover 20, and forms part of the electrical compartment 301 around the box cover 20. The frame 31 plays a role of blocking and limiting, when the electrical unit 200 is assembled into the frame 31 from the assembling opening 312, the frame 31 can block the electrical unit 200 from deviating from the original position, so as to facilitate the subsequent installation of the electrical unit 200. After the installation of the electrical unit 200 is completed, the top cover 32 is assembled onto the frame 31 to cover the assembling opening 312 and form the complete electrical compartment 301.

[0031] In addition, the shell cover assembly 30 is divided into the frame 31 and the top cover 32, which can facilitate the setting of different materials and manufacturing processes according to different functions. For example, the frame 31 needs to have a blocking function and has a relatively high strength requirement, so the material of the frame 31 can be selected from iron, aluminum or alloy materials. The top cover 32 needs to have a shielding function and has a low strength requirement, so the material of the top cover 32 can be selected from plastic materials such as PC, PMMA, PA and PS. Even the transparent material can be used to facilitate the viewing of the operation of the electrical compartment 301.

[0032] Optionally, the shell cover assembly 30 further comprises a panel 33 and a connector 34, the panel 33 is provided with a socket 332, the connector 34 is assembled into the socket 332, the top cover 32 is provided with a skylight 321 communicating with the electrical compartment 301, and the panel 33 is connected with the top cover 32 and covers the skylight 321. The top cover 32 is located at the side of the frame 31 away from the box cover 20, the panel 33 is connected with the top cover 32, and the panel 33 is also located at the side of the frame 31 away from the box cover 20, so that the socket 332 on the panel 33 is towards the thickness direction of the battery box body 100, and then the plug can also be towards the thickness direction of the battery box body 100, thereby facilitating the butt joint with the external connector 34. In addition, in the embodiment, the connector 34 is concentrated on the panel 33, thereby facilitating centralized management and maintenance. The connector 34 comprises a water pipe connector 34 and a connector connector 34.

[0033] The shell cover assembly 30 further comprises a first sealing ring 35. The frame 31 and the box cover 20 are welded and sealed. The welding method can ensure that the gap between the frame 31 and the box cover 20 is filled, thereby ensuring the sealing of the connection. The top cover 32 and the frame 31 are sealed and connected through the first sealing ring 35. The first sealing ring 35 can be arranged between the top cover 32 and the frame 31. The top cover 32 presses the first sealing ring 35 on the frame 31, and then the frame 31 is connected by rivets or screws. The first sealing ring 35 can also be arranged on the side of the top cover 32 away from the frame 31. The first sealing ring 35 is placed on the top cover 32, and then the frame 31 is connected by rivets or screws. The first sealing ring 35 can be made of silica gel or foam.

[0034] The shell cover assembly 30 further comprises a second sealing ring 36 and a third sealing ring 37. The panel 33 and the top cover 32 are sealed and connected through the second sealing ring 36. The box cover 20 and the box body 10 are sealed and connected through the third sealing ring 37. The second sealing ring 36 can be arranged between the panel 33 and the top cover 32. The panel 33 presses the second sealing ring 36 on the top cover 32, and then the top cover 32 is connected by rivets or screws. The second sealing ring 36 can also be arranged on the side of the panel 33 away from the top cover 32. The second sealing ring 36 is placed on the panel 33, and then the top cover 32 is connected by rivets or screws. The third sealing ring 37 can be arranged between the box cover 20 and the box body 10. The box cover 20 presses the third sealing ring 37 on the box body 10, and then the box body 10 is connected by rivets or screws. The third sealing ring 37 can also be arranged on the side of the box cover 20 away from the box body 10. The third sealing ring 37 is placed on the box cover 20, and then the box body 10 is connected by rivets or screws. The second sealing ring 36 can be made of silica gel or foam. The third sealing ring 37 can be made of silica gel or foam.

[0035] Please refer to FIG. 3 and FIG. 5. FIG. 5 is a schematic diagram of the internal structure of the battery pack provided in the embodiment of the present application.

[0036] The battery box body 100 further comprises a plurality of reinforcing beams 50 connected to the box body 10. The plurality of reinforcing beams 50 are arranged in parallel and spaced apart along the length direction of the box body 10. The adjacent reinforcing beams 50 are configured to fit the battery cells 300. The reinforcing beams 50 are connected to the opposite sides of the box body 10, thereby reinforcing the structural strength of the box body 10 and preventing deformation. The plurality of reinforcing beams 50 divide the battery compartment 101 into a day-shaped structure. Compared with the field-shaped structure, the embodiment omits the longitudinal beams connected perpendicularly to the reinforcing beams 50, thereby saving space for mounting the battery cells 300 and improving the energy density of the battery pack. In addition, after omitting the longitudinal beams, the space of the battery compartment 101 is more optimized, thereby facilitating the arrangement of the battery cells 300.

Claims

1. A battery box, comprising: a box body having a battery compartment configured to accommodate battery cells of a battery pack; a box cover connected to the box body and covering the battery compartment; and a cover assembly connected to a side of the box cover away from the battery compartment, the cover assembly having an electrical compartment configured to accommodate electrical units of the battery pack, the box cover having an opening corresponding to an area of the electrical compartment and communicating with the battery compartment and the electrical compartment. The box cover has a protrusion formed towards the electrical compartment, the protrusion being configured to support the electrical units.

2. The battery pack of claim 1, wherein, The protrusion has a plurality of parallel and spaced long grooves formed thereon; or the protrusion has a plurality of spaced spherical grooves formed thereon.

3. The battery pack of claim 2, wherein, The battery box further comprises a plurality of load-bearing beams disposed on the protrusion and connected to the cover assembly respectively.

4. The battery pack of claim 2, wherein, The cover assembly comprises a frame connected to the box cover and having an accommodating opening formed at an end thereof away from the box cover, and a top cover connected to the frame and covering the accommodating opening.

5. The battery pack of claim 1, wherein, The cover assembly further comprises a panel having an accommodating opening formed therein and a connector accommodated in the accommodating opening, and the top cover has a skylight communicating with the electrical compartment.

6. The battery pack of claim 5, wherein, The cover assembly further comprises a first sealing ring, the frame and the box cover being welded and sealedly connected, and the top cover and the frame being sealedly connected via the first sealing ring.

7. The battery pack of claim 5, wherein, The cover assembly further comprises a second sealing ring and a third sealing ring, the panel and the top cover being sealedly connected via the second sealing ring, and the box cover and the box body being sealedly connected via the third sealing ring.

8. The battery pack of claim 6, wherein, The battery box further comprises a plurality of reinforcing beams connected to the box body, the reinforcing beams being spaced and parallel along a length direction of the box body, and the adjacent reinforcing beams being configured to accommodate battery cells.

9. The battery pack of claim 1, wherein, Battery cells accommodated in a battery compartment of the battery box of any one of claims 1 to 9, electrical units accommodated in an electrical compartment of the battery box, and the battery cells and the electrical units being electrically connected via the opening.

10. A battery pack comprising: ​

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