Battery box and energy storage device

Abstract

The utility model relates to a battery box and an energy storage device. The battery box body comprises a shell structure, a sealing cover structure and an electric connection assembly, the sealing cover structure comprises a main body part and an extension part which are connected with each other, the main body part covers the shell structure in a sealing manner to form an accommodating cavity, the accommodating cavity is used for accommodating the single battery, the main body part is provided with an opening communicated with the accommodating cavity, and the extension part extends in a direction deviating from the accommodating cavity and is at least partially bent to be arranged in parallel with the main body part at an interval; and the electric connection assembly is arranged on the extension part and is used for penetrating through the opening to be electrically connected with the battery monomers. And the opening is beneficial to heat dissipation of the battery monomers in the battery box body. The electric connection assembly is mounted on the extension part, so that the electric connection assembly is arranged outside the battery box body, and part of assemblies of the energy storage device are transferred from the interior of the battery box body to the exterior of the battery box body, so that direct disassembly or assembly from the exterior of the battery box body is facilitated, and meanwhile, more internal space of the battery box body is released; and the diffusion of heat in the battery box body is further promoted.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery box and an energy storage device. Background Art

[0002] At present, in the field of energy storage technology, in order to increase the capacity of a single energy storage device, the number of battery cells is usually increased so that more battery cells can be accommodated in the battery box. The battery box usually also contains other components, which are arranged on the side walls of the battery box, resulting in a compact internal structure of the battery box of the energy storage device and complex electrical connections between the battery cells and other components. When the energy storage device fails, the battery cells and other components interfere with each other, making it difficult to disassemble or reassemble, and difficult to repair and replace; in addition, the battery cells generate heat during operation, and the overly compact and complex internal structure of the battery box causes the heat to accumulate continuously and is difficult to dissipate, which can easily cause the battery cells to overheat and affect the performance and service life of the energy storage device, and may even cause safety issues such as fire in the energy storage device. Utility Model Content

[0003] Based on this, it is necessary to provide a battery box and energy storage device to address the current problems that when an energy storage device fails, the battery cells and other components interfere with each other, are not easy to disassemble or reassemble, and are difficult to repair and replace; in addition, the battery cells generate heat during operation, and the overly compact and complex internal structure of the battery box causes the heat to accumulate continuously and is difficult to dissipate, which can easily cause the battery cells to overheat and affect the performance and service life of the energy storage device, and may even cause the energy storage device to catch fire and other safety issues.

[0004] In a first aspect, a battery box comprises:

[0005] Shell structure;

[0006] A cover structure, comprising a main body and an extension part connected to each other, wherein the main body covers the shell structure to form a receiving cavity, wherein the receiving cavity is used to receive a battery cell, the main body is provided with an opening communicating with the receiving cavity, and the extension part extends in a direction away from the receiving cavity and is at least partially bent to be arranged in parallel with the main body and spaced apart from each other; and

[0007] An electrical connection component is disposed on the extension portion, and is used to penetrate the opening to be electrically connected to the battery cell.

[0008] In one embodiment, there are multiple openings, and all of the openings are spaced apart on the main body.

[0009] In one embodiment, the extension portion includes a first bent portion, the first bent portion includes a first shoulder and a first neck, the first shoulder is connected to the main body and extends in a direction away from the accommodating cavity, the first shoulder is connected to the shell structure, the first neck is connected to the first shoulder and extends in a direction away from the first shoulder, the first neck is arranged opposite to the main body, and the electrical connection component is partially arranged on the first neck.

[0010] In one embodiment, the extension portion also includes a lateral connecting portion, which is connected between the first neck, the first shoulder and the main body, and the lateral connecting portion is connected to the shell structure, and the electrical connection component is partially arranged on the lateral connecting portion.

[0011] In one embodiment, the extension portion also includes a second bent portion connected to the main body portion, the second bent portion includes a second shoulder and a second neck, the second shoulder is connected to the main body portion and extends in a direction away from the accommodating cavity, the second shoulder is arranged opposite to the first shoulder, the second neck is connected to the second shoulder and extends in the direction of the first neck, and the second shoulder and / or the second neck are connected to the shell structure.

[0012] In one of the embodiments, the shell structure is recessed inwardly to form a step portion, and along the thickness direction of the battery box, the step portion is provided with a through slot, and the slot is connected to the accommodating cavity.

[0013] In one embodiment, the battery box also includes a frame structure, which is arranged in the accommodating cavity and connected to the shell structure, and the frame structure includes a connected transverse structure and a longitudinal structure, and the transverse structure is intersected with the longitudinal structure to form a separation space, and the battery cell is located in the separation space and abuts against the transverse structure and the longitudinal structure.

[0014] In one of the embodiments, the longitudinal structure is provided with grooves penetrating through both ends thereof along its length direction, and a penetrating welding hole is provided on the side of the groove wall contacting the shell structure.

[0015] In one embodiment, the shell structure is provided with a first ventilation hole and a second ventilation hole, both of which are connected to the accommodating cavity, and the first ventilation hole is arranged opposite to the covering structure, and along the length direction of the battery box, the second ventilation hole is located between the covering structure and the first ventilation hole.

[0016] In a second aspect, an energy storage device comprises a control component, a communication component, a battery cell and a battery case as described in the first aspect, wherein the battery case is used to accommodate the battery cell, the control component and the communication component are both connected to the battery case and located outside the accommodating cavity, and are both electrically connected to the battery cell.

[0017] The main body of the battery case is used to cover the shell structure, and an opening connected to the accommodating cavity is provided on the main body, which is conducive to the heat dissipation of the battery cells inside the battery case and avoids heat accumulation. Furthermore, an extension portion is provided, and an electrical connection component is installed on the extension portion, so that the electrical connection component is arranged outside the battery case, and the space outside the battery case can be utilized. The electrical connection component can be extended into the accommodating cavity through the opening to achieve electrical connection with the battery cells, thereby transferring part of the structure of the energy storage device from the inside of the battery case to the outside of the battery case, which is convenient for directly disassembling or assembling the electrical connection component from the outside of the battery case, and at the same time simplifying the structure inside the battery case, releasing more space inside the battery case, further promoting the diffusion of heat inside the battery case, avoiding heat accumulation inside the battery case, and helping to improve the performance, service life and safety of the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A three-dimensional diagram of a battery box provided in an embodiment of the present application.

[0019] Figure 2 A three-dimensional diagram of a battery box accommodating a battery cell provided in an embodiment of the present application.

[0020] Figure 3 An exploded view of a battery box provided in an embodiment of the present application.

[0021] Figure 4 A structural schematic diagram of a sealing structure in a battery box provided in an embodiment of the present application.

[0022] Figure 5 Another structural schematic diagram of a sealing structure in a battery box provided in an embodiment of the present application.

[0023] Figure 6 A schematic structural diagram of a shell structure in a battery box provided in an embodiment of the present application.

[0024] Figure 7 A structural schematic diagram of a shell structure provided in an embodiment of the present application in which a frame structure is arranged.

[0025] Figure 8 A structural schematic diagram of a frame structure in a battery box provided in an embodiment of the present application.

[0026] Fig. 9A schematic structural diagram of the longitudinal structure in the frame structure provided in an embodiment of the present application.

[0027] Explanation of the reference numerals: 10. battery case; 1. shell structure; 11. step portion; 111. slot; 12. first ventilation hole; 13. second ventilation hole; 2. cover structure; 21. main body; 211. opening; 212. air vent; 22. extension portion; 221. first bent portion; 2211. first shoulder; 2211a. through hole; 2212. first neck; 222. lateral connecting portion; 223. second bent portion; 2231. second shoulder; 2232. second neck; 3. accommodating cavity; 4. electrical connection assembly; 5. frame structure; 51. transverse structure; 52. longitudinal structure; 521. groove; 5211. welding hole; 20. battery cell; 201. connecting piece; 30. control assembly; 40. air cooling assembly. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0029] The embodiments of the present application provide an energy storage device that can be applied to the fields of household energy storage, backup power storage, industrial and commercial energy storage, portable energy storage, etc. The household energy storage device can realize grid frequency and peak regulation, demand-side response, and form a microgrid. The backup power storage device can be applied to communication base stations, data rooms, public security monitoring, rail transit, etc., including indoor energy storage battery cabinets, integrated storage and charging machines, and large-scale energy storage systems. The industrial and commercial energy storage device is suitable for car charging stations, emergency backup power in areas without electricity or power shortage, grid-connected applications, etc., and can be used in small power stations, resort islands, ports, hotels, schools or hospitals and other places. The portable energy storage device can realize the integrated application of photovoltaics, energy storage and batteries, and can be used as an ideal portable power source for many activities at home, outdoors and in emergency situations.

[0030] The number of energy storage devices can be one or more. When the number of energy storage devices is multiple, multiple energy storage devices can be connected in series, in parallel, or in a combination of series and parallel to achieve greater capacity and power. Energy storage devices may include but are not limited to battery packs, battery clusters, energy storage cabinets, energy storage containers, etc.

[0031] The energy storage device includes a battery box and a battery cell. The battery cell can be a secondary battery such as a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, a lithium-ion battery, a polymer lithium-ion battery, or a lithium-ion battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery. The battery cell can be a square battery.

[0032] At present, the internal structure of the battery box of the energy storage device is too compact. When its internal components fail, it is difficult to remove and place, which increases the difficulty of disassembly, maintenance and assembly. During the operation of the energy storage device, various components generate heat, and the heat is concentrated inside the battery box and difficult to dissipate, affecting the performance and service life of the energy storage device.

[0033] See also Figure 1 and Figure 2 Based on this, an embodiment of the present application provides an energy storage device, which includes a battery box 10, a battery cell 20, a control component 30, a communication component and an air cooling component 40.

[0034] See also Figure 2 The battery case 10 may be in a square or cylindrical shape. Taking a square shape as an example, the battery cell 20 is located in the accommodating cavity 3. In one arrangement of the battery cells 20, multiple batteries are arranged adjacent to each other in the long side direction of the battery case 10, and are spaced to form multiple groups along the wide side direction of the battery case 10, which may be two groups or three groups. Two adjacent battery cells 20 along the long side direction are electrically connected through the connecting piece 201 and the internal wiring harness.

[0035] See also Figure 2 The control component 30 is also called a battery management system, which is an integrated circuit system for monitoring and managing the battery cells 20. It monitors various parameters of the energy storage device (such as voltage, temperature, charge and discharge status, etc.) in real time, and balances, protects and controls the battery cells 20 to ensure the safe, stable and efficient operation of the battery. The communication component refers to a module for communicating with an external system. The control component 30 and the communication component are arranged outside the battery box 10. The control component 30 and the communication component are both electrically connected to the battery cells 20.

[0036] See also Figure 2 The air cooling assembly 40 is disposed on the housing structure 1, specifically on the wide side plate of the housing structure 1, and is disposed opposite to the cover structure 2. The air cooling assembly 40 is used to form airflow to cool the battery cell 20, and is used for heat dissipation inside the battery box 10.

[0037] See also Figure 3The specific structure of the battery case 10 will be described below. In some embodiments, the battery case 10 includes a cover structure 2, a housing structure 1, and an electrical connection assembly 4. The communication assembly is electrically connected to the battery cell 20 through the electrical connection assembly 4. The external power harness is also electrically connected to the battery cell 20 through the electrical connection assembly 4.

[0038] See also Figure 3 The cover structure 2 includes a main body 21 and an extension 22 connected to each other. The main body 21 covers the shell structure 1 to form a receiving cavity 3. The receiving cavity 3 is used to receive the battery cell 20. Figure 5 The main body 21 is provided with an opening 211 communicating with the accommodating cavity 3. Figure 3 and Figure 4 The extension portion 22 extends in a direction away from the accommodating cavity 3, and is at least partially bent to be arranged parallel to and spaced from the main body 21; the electrical connection component 4 is provided on the extension portion 22, and the electrical connection component 4 is used to penetrate the opening 211 to electrically connect with the battery cell 20. The extension portion 22 extends outside the accommodating cavity 3, and installing the electrical connection component 4 on the extension portion 22 can utilize the space outside the battery case 10, thereby facilitating the disassembly and replacement of the communication component and the control component 30 from the outside, and can also release the space inside the battery case 10, facilitating the disassembly and replacement of the single battery inside the battery case 10. Furthermore, the main body 21 is provided with an opening 211, which is conducive to the heat dissipation inside the battery case 10 on the one hand, and can serve as a channel for electrical connection between the electrical connection component 4 and the single battery on the other hand, facilitating the connection of the electrical connection component 4 with the battery cell 20.

[0039] See also Figure 5 In some embodiments, there are multiple openings 211, and all openings 211 are arranged at intervals on the main body 21. Adding multiple openings 211 to increase the ventilation area is beneficial to the heat dissipation of the battery cell 20. The number of openings 211 can be two, three or four. The openings 211 can be arranged near the upper, lower, left and right sides of the main body 21. Preferably, the openings 211 are arranged near the upper side of the main body 21, and the openings 211 are arranged in an array along the width direction of the battery box 10, which can improve the heat dissipation effect of the battery box 10. Please refer to Figure 2 When the opening 211 is disposed on the upper side of the main body 21 , the control component 30 may be disposed below the opening 211 , and the control component 30 is electrically connected to the internal wiring harness of the battery cell 20 by passing the wiring harness through the opening 211 .

[0040] Furthermore, a wire protection sleeve may be provided at the edge of the opening 211 to protect the wire harness passing through the opening 211 from being cut by the sharp edge of the opening 211 .

[0041] See also Figure 3It can be understood that the main body 21 includes a first side, a second side, a third side and a fourth side connected in sequence. The first side and the second side are respectively arranged at the upper and lower ends of the main body 21, which are consistent with the width direction of the battery case 10. The third side and the fourth side are respectively arranged at the left and right ends of the main body, which are consistent with the thickness direction of the battery case 10. The second side and the fourth side are connected between the first side and the third side. In an optional manner, any one or more of the first side, the second side, the third side and the fourth side extend to the outside of the battery case 10 to form an extension portion 22. Exemplarily, only the first side extends outward to form the extension portion 22; or the first side, the second side, the third side and the fourth side extend outward at the same time to form the extension portion 22. Providing the extension portion 22 can increase the connection area between the cover structure 2 and the shell structure 1, and improve the connection strength between the two.

[0042] The embodiment of the present application does not limit the direction in which the extension portion 22 extends outward. In other words, the first side can extend outward horizontally along the length direction of the battery case 10, parallel to the cover of the battery case 10. Alternatively, the first side can extend outward obliquely, and be set at an angle with the cover of the battery case 10. The embodiment of the present application also does not limit the length of the extension portion 22 extending outward.

[0043] See also Figure 3 In order to improve the stability of the connection between the cover structure 2 and the shell structure 1 and to improve the connection strength between the cover structure 2 and the shell structure 1, the first side, the second side, the third side and the fourth side of the main body 21 are preferably extended outward at the same time to form an extension part 22. When the cover structure 2 and the shell structure 1 are assembled, the extension part 22 can expand the connection area of ​​the upper, lower, left and right sides of the cover structure 2, so that the cover structure 2 and the shell structure 1 are stably connected.

[0044] See also Figure 3 Furthermore, since the main body 21 is provided with a plurality of openings 211 for ventilation, and in order to ensure that there is enough area on the main body 21 to add the electrical connection assembly 4, the present application makes the extension 22 bend. The bent extension 22 can provide an installation area for the electrical connection assembly 4, does not interfere with the ventilation and heat dissipation of the openings 211, and can reduce the length of the battery box 10 and compact the outer contour size of the battery box 10.

[0045] The extension portion 22 is at least partially bent to be arranged opposite to the main body portion 21. Exemplarily, the extension portion 22 extends from the first side and then bends downward. Or the extension portion 22 extends from the second side and then bends upward. Or the extension portion 22 extends from the third side and then bends to the right. Or the extension portion 22 extends from the fourth side and then bends to the left. Only one side of the extension portion 22 may be bent, or multiple sides of the extension portion 22 may be bent at the same time.

[0046] See also Figure 2 and Figure 4Generally, the connecting piece 201 and the wiring harness connected to the battery cell 20 are located above the battery cell 20 so as to be assembled from above the battery case 10. In order to shorten the electrical connection distance between the external communication component, the control component 30 and the power harness of the battery case 10 and the battery cell 20, the electrical connection component 4 needs to be arranged as close to the top of the battery cell 20 as possible, so the extension part 22 needs to be arranged close to the top of the main body 21. Figure 4 Preferably, the first side of the main body 21 extends to form an extension portion 22 that bends downward, and the extension portion 22 is close to the top of the battery cell 20 and is provided with an electrical connection component 4, which can shorten the electrical connection distance between the electrical connection component 4 and the battery cell 20, which is beneficial to improving the response speed.

[0047] See also Figure 4 In some embodiments, the extension portion 22 includes a first bent portion 221, the first bent portion 221 includes a first shoulder 2211 and a first neck 2212, the first shoulder 2211 is connected to the main body 21 and extends in a direction away from the accommodating cavity 3, the first shoulder 2211 is connected to the shell structure 1, the first neck 2212 is connected to the first shoulder 2211 and extends in a direction away from the first shoulder 2211, the first neck 2212 is arranged opposite to the main body 21, and the electrical connection component 4 is partially arranged on the first neck 2212. The first shoulder 2211 is arranged to increase the connection area between the cover structure 2 and the shell structure 1. The first neck 2212 is arranged to provide an area for the electrical connection component 4.

[0048] See also Figure 4 Furthermore, the first shoulder 2211 is provided with a through hole 2211a, and the through hole 2211a is connected to the opening 211. The electrical connection assembly 4 on the first neck 2212 is connected to the connecting piece 201 on the battery cell 20 through a fastener, and the fastener is located below the first neck 2212. The through hole 2211a is additionally provided on the first shoulder 2211, so that it can avoid the fastener from being installed from top to bottom, in order to facilitate the assembly of the fastener.

[0049] Furthermore, the through hole 2211a can be a square hole, a circular hole or an oblique hole. The oblique hole can increase the opening area of ​​the through hole 2211a, provide an operating space for operators to install fasteners, and ensure the structural strength of the first shoulder 2211.

[0050] See also Figure 4In some embodiments, the extension portion 22 further includes a lateral connection portion 222, the lateral connection portion 222 is connected between the first neck portion 2212, the first shoulder portion 2211 and the main body portion 21, the lateral connection portion 222 is connected to the shell structure 1, and the electrical connection component 4 is partially disposed on the lateral connection portion 222. In other words, the third side and the fourth side on the left and right sides of the main body portion 21 both extend outward to form the lateral connection portion 222. On the one hand, the lateral connection portion 222 can increase the connection area between the cover structure 2 and the shell structure 1, and on the other hand, it can also serve as a setting position for the electrical connection component 4. Optionally, the electrical connectors of the communication component are disposed on the lateral connection portions 222 on the left and right sides, thereby enabling communication between the battery cells 20 on both sides.

[0051] Furthermore, the lateral connection portion 222 may be fixed to the shell structure 1 by fasteners such as bolts or nuts.

[0052] See also Figure 4 In some embodiments, the extension portion 22 further includes a second bent portion 223 connected to the main body 21, the second bent portion 223 includes a second shoulder 2231 and a second neck 2232, the second shoulder 2231 is connected to the main body 21 and extends in a direction away from the accommodating chamber 3, the second shoulder 2231 is arranged opposite to the first shoulder 2211, the second neck 2232 is connected to the second shoulder 2231 and extends in a direction toward the first neck 2212, and the second shoulder 2231 and / or the second neck 2232 are connected to the shell structure 1. It can be understood that the second bent portion 223 is arranged below the main body 21. The second bent portion 223 is formed by the second side of the main body 21 extending out and then bending. Both the second shoulder 2231 and the second neck 2232 can increase the connection area with the shell structure 1, and the second shoulder 2231 and the second neck 2232 can be fixed to the shell structure 1 by bolts or nuts. Furthermore, there is a distance between the second neck portion 2232 of the second bent portion 223 and the main body portion 21 , and the second bent portion 223 can be used as a handle to facilitate carrying the battery box 10 .

[0053] See also Figure 4 Furthermore, a plurality of air holes 212 are provided on the main body 21. The air holes 212 are located below the main body 21, which is beneficial to the heat dissipation below the battery box 10 and improves the heat dissipation effect.

[0054] See also Figure 6The shell structure 1 includes a bottom plate, a long side plate, a wide side plate and a cover plate connected to each other. The long side plates include two and are arranged opposite to each other, the wide side plate is arranged opposite to the cover structure 2, and the cover plate is arranged opposite to the bottom plate. The long side plates, the wide side plates and the cover structure 2 are connected between the bottom plate and the cover plate to jointly construct a accommodating cavity 3. The long side plates extend along the front-to-back direction of the battery box 10, the wide side plates extend along the left-to-right direction of the battery box 10, and the cover plate is located above the battery box 10.

[0055] The shell structure 1 can be formed by welding, or fixedly connected by fasteners such as screws and nuts, or directly stamped by sheet metal parts.

[0056] See also Figure 6 In some embodiments, the shell structure 1 is recessed inwardly to form a step portion 11. The shell structure 1 is recessed inwardly to form a step portion 11. Along the thickness direction of the battery case 10, the step portion 11 is provided with a through slot 111, and the slot 111 is connected to the accommodating cavity 3. The step portion 11 of the slot 111 can be used as a handle to facilitate the carrying of the battery case 10. The slot 111 may be provided on at least one of the bottom plate, the long side plate or the wide side plate. Preferably, the slot 111 is provided at the junction of the bottom plate and the long side plate, and does not interfere with the arrangement of the battery cell 20. The number of the slots 111 may be two, four or six.

[0057] See also Figure 6 In some embodiments, the housing structure 1 is provided with a first ventilation hole 12 extending therethrough, the first ventilation hole 12 is communicated with the accommodating cavity 3, and the first ventilation hole 12 is arranged opposite to the cover structure 2. In other words, the first ventilation hole 12 is arranged on the wide side plate of the housing structure 1. The first ventilation hole 12 is used to install the air cooling component 40, so that the air cooling component 40 forms airflow to cool the inside of the battery box 10, improve the heat exchange of the convection surface, and accelerate the airflow to take the heat out of the battery box 10.

[0058] See also Figure 6 and Figure 7 The air cooling assembly 40 is connected to the hole wall of the first ventilation hole 12 and is located outside the battery box 10, which can save the length of the battery box 10. The air cooling assembly 40 includes one or more fans, and there can be one or more corresponding first ventilation holes 12. The fan and the first ventilation hole 12 can be arranged at the center of the wide side plate, or symmetrically arranged along the symmetry axis of the wide side plate.

[0059] See also Figure 6In some embodiments, the shell structure 1 is provided with a second ventilation hole 13 extending therethrough, and the second ventilation hole 13 is connected to the accommodating cavity 3. Along the length direction of the battery case 10, the second ventilation hole 13 is located between the cover structure 2 and the first ventilation hole 12. In other words, the second ventilation hole 13 is provided on the long side panel. The second ventilation hole 13 may be provided on the long side panel on the left, or on the long side panel on the right, or on the long side panels on both sides. Preferably, the second ventilation hole 13 is provided on the long side panels on both sides at the same time, which is beneficial to the heat dissipation on the left and right sides of the battery case 10. Optionally, there may be one or more second ventilation holes 13.

[0060] See also Figure 2 , Figure 7 and Figure 8 In order to limit the movement of the battery cell 20 inside the accommodating cavity 3, in some embodiments, the battery case 10 also includes a frame structure 5, which is arranged in the accommodating cavity 3 and connected to the shell structure 1. The frame structure 5 includes a connected transverse structure 51 and a longitudinal structure 52. The transverse structure 51 and the longitudinal structure 52 are intersected to form a separation space. The battery cell 20 is located in the separation space and abuts against the transverse structure 51 and the longitudinal structure 52.

[0061] See also Figure 7 The frame structure 5 can be fixed on the bottom plate of the shell structure 1 by means of pressure rivet nuts or pull rivet nuts in combination with bolts or screws. The pressure rivet nuts and pull rivet nuts can be arranged on the transverse structure 51.

[0062] See also Figure 8 and Fig. 9 In some embodiments, the longitudinal structure 52 is provided with grooves 521 penetrating both ends thereof along its length direction, and a penetrating welding hole 5211 is provided on the side where the groove wall of the groove 521 contacts the shell structure 1. The provision of the groove 521 facilitates welding the longitudinal structure 52 to the bottom plate of the shell structure 1 from the inside of the longitudinal structure 52, and the welding hole 5211 enables the welding point to be located inside the groove 521, thereby preventing the welding slag from being outside the longitudinal structure 52 and affecting the battery cell 20.

[0063] See also Fig. 9 Furthermore, along the thickness direction of the longitudinal structure 52 , the two opposite groove walls of the groove 521 are folded inwardly, which can prevent the battery cell 20 from being scratched or damaged by the sharp edges of the groove wall when it abuts against the longitudinal structure 52 , thereby protecting the battery cell 20 .

[0064] See also Figure 8, the present application does not limit the number and arrangement of the transverse structure 51 and the longitudinal structure 52. For example, the transverse structure 51 may be one, two or three, etc. The longitudinal structure 52 may be one, two or three, etc. Two transverse structures 51 may be respectively arranged at both ends of a longitudinal structure 52 so that the frame structure 5 is in an I-shape, thereby forming two separation spaces on both sides of the longitudinal structure 52 for placing two groups of battery cells 20 respectively. Alternatively, a transverse structure 51 may be arranged in the middle position of a longitudinal structure 52 so that the frame structure is in a cross shape, thereby forming four separation spaces on both sides of the longitudinal structure 52 for placing four groups of battery cells 20 respectively. Alternatively, two transverse structures 51 and a longitudinal structure 52 are cross-arranged so that the frame structure 5 forms a fence shape, thereby forming six separation spaces on both sides of the longitudinal structure 52 for placing six groups of battery cells 20 respectively. In order to increase the capacity of the energy storage device, the space occupied by the battery cells 20 in the battery box 10 should be increased, and the space occupied by the frame structure 5 should be reduced. It is preferred that the frame structure 5 is formed in an I-shape.

[0065] See also Figure 7 and Figure 8 Furthermore, in the I-shaped frame structure 5, the transverse structure 51 is arranged along the width direction of the battery box 10, and the longitudinal structure 52 is arranged along the length direction of the battery box 10. Thus, the two groups of battery cells 20 are arranged along the length direction of the battery box 10, which can increase the total capacity of the energy storage device, reduce the internal resistance of the energy storage device, and improve the output power of the energy storage device. In addition, the two groups of battery cells 20 are respectively close to the second ventilation holes 13 on the long side panels, which is conducive to heat dissipation, effectively cooling the battery cells 20 to reduce the risk of overheating.

[0066] In summary, a battery case provided by the embodiment of the present application has at least the following technical effects: First, the space inside and outside the battery case is reasonably utilized to facilitate the electrical assembly, connection and disassembly of the various components of the energy storage device. Through the opening design of the extension part and the main body of the cover structure, the control component and the communication component can be located outside the battery case, so that only the battery cell, the connecting piece and the internal wiring harness are left inside the battery case, thereby releasing the internal space of the battery case, facilitating the direct disassembly of the control component and the communication component from the outside of the battery case, and facilitating assembly and maintenance. Second, the heat dissipation effect is improved, and the heat dissipation effect of the battery case is improved by setting openings at intervals in the main body, and setting the first ventilation hole and the second ventilation hole to achieve convection ventilation, thereby improving the service life of the energy storage device. Third, since the battery case has only single cells along its length, the length of the battery case can be reduced, and the size of the case can be compacted while facilitating disassembly and assembly, thereby reducing the consumables of the case, reducing the processing technology, and reducing costs.

[0067] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0068] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0069] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0070] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0071] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0072] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A battery box, characterized in that: include: Shell structure; A cover structure, comprising a main body and an extension part connected to each other, wherein the main body covers the shell structure to form a receiving cavity, wherein the receiving cavity is used to receive a battery cell, the main body is provided with an opening communicating with the receiving cavity, and the extension part extends in a direction away from the receiving cavity and is at least partially bent to be arranged in parallel with the main body and spaced apart from each other; as well as An electrical connection component is disposed on the extension portion, and is used to penetrate the opening to be electrically connected to the battery cell.

2. The battery box according to claim 1, characterized in that: There are a plurality of openings, and all of the openings are arranged at intervals on the main body.

3. The battery box according to claim 1, characterized in that: The extension portion includes a first bending portion, the first bending portion includes a first shoulder and a first neck, the first shoulder is connected to the main body and extends in a direction away from the accommodating cavity, the first shoulder is connected to the shell structure, the first neck is connected to the first shoulder and extends in a direction away from the first shoulder, the first neck is arranged opposite to the main body, and the electrical connection component is partially arranged on the first neck.

4. The battery box according to claim 3, characterized in that: The extension portion also includes a lateral connection portion, which is connected between the first neck portion, the first shoulder portion and the main body portion, and is connected to the shell structure. The electrical connection component portion is arranged on the lateral connection portion.

5. The battery case according to claim 3, characterized in that: The extension portion also includes a second bent portion connected to the main body portion, the second bent portion includes a second shoulder and a second neck portion, the second shoulder portion is connected to the main body portion and extends in a direction away from the accommodating cavity, the second shoulder portion is arranged opposite to the first shoulder portion, the second neck portion is connected to the second shoulder portion and extends in the direction of the first neck portion, and the second shoulder and / or the second neck portion are connected to the shell structure.

6. The battery case according to any one of claims 1 to 5, characterized in that: The shell structure is recessed inwardly to form a step portion, and along the thickness direction of the battery box, the step portion is provided with a through slot, and the slot is communicated with the accommodating cavity.

7. The battery case according to any one of claims 1 to 5, characterized in that: The battery case also includes a frame structure, which is arranged in the accommodating cavity and connected to the shell structure. The frame structure includes a connected transverse structure and a longitudinal structure. The transverse structure and the longitudinal structure are intersected to form a separation space. The battery cell is located in the separation space and abuts against the transverse structure and the longitudinal structure.

8. The battery case according to claim 7, characterized in that: The longitudinal structure is provided with grooves penetrating through both ends thereof along its length direction, and a penetrating welding hole is provided on the side where the groove wall of the groove contacts the shell structure.

9. The battery case according to any one of claims 1 to 5, characterized in that: The shell structure is provided with a first ventilation hole and a second ventilation hole, both of which are connected to the accommodating cavity, and the first ventilation hole is arranged opposite to the covering structure, and along the length direction of the battery box, the second ventilation hole is located between the covering structure and the first ventilation hole.

10. An energy storage device, characterized in that: It comprises a control component, a communication component, a battery cell and a battery case as described in any one of claims 1 to 9, wherein the battery case is used to accommodate the battery cell, the control component and the communication component are both connected to the battery case and located outside the accommodating cavity, and are both electrically connected to the battery cell.

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