Energy storage device

Abstract

The utility model relates to an energy storage device. The energy storage device comprises a battery pack; the box body is provided with a containing cavity for containing the battery pack, and the box body is defined by a top wall, a bottom wall and a first side wall; the first butt joint part comprises a first groove, and the first groove is concavely formed in the direction from the top wall to the interior of the containing cavity; the second butt joint part comprises a convex block, and the convex block is formed in a protruding mode from the bottom wall to the outer portion of the containing cavity; the handle comprises a second groove, and the second groove is concavely arranged from the first side wall to the direction close to the first groove; the fastener is arranged in the second groove and used for fixing the first butt joint part and the second butt joint part; the energy storage device and another energy storage device can be stacked up and down, the number of parts used for stacking can be reduced, the cost is reduced, the inversion output power and the battery capacity of the energy storage device are improved according to requirements, and the differentiated requirements of users are met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to an energy storage device. BACKGROUND

[0002] With the development of society, the use of household energy storage devices is becoming more and more popular. Different users have different requirements and use scenarios for energy storage devices. For example, some require large inverter output power to meet the needs of high-power electrical appliances; some require larger battery capacity to cope with long-term endurance. Therefore, a stacking positioning structure needs to be designed on the box of the battery pack.

[0003] In related technologies, one solution is to stack the battery packs or the battery packs and other modules by relying on protruding limit structures such as convex hulls and protrusions. The problem with this approach is that the size of the system and the individual modules in the stacking direction cannot be too large, otherwise the protruding limit structures alone cannot stably fix the modules. Another solution is to add additional connecting pieces and screws for fastening on the basis of the above solution. The connecting pieces are arranged around the mating surface of the box. This approach increases the number of connecting pieces and corresponding screws, resulting in higher design and production costs of related parts and materials, and higher installation costs and difficulty of connecting pieces and corresponding screws. Since the connecting pieces need to be pressed against the box to achieve fixation, the area of the connecting piece pressing region greatly affects the stability of the stack. When the module height dimension is large, the size of the connecting piece also needs to be increased, which will occupy a large area of the box and cause difficulties in structural design. CONTENT OF THE UTILITY MODEL

[0004] The present application provides an energy storage device to solve the technical problem that the existing energy storage device has poor stacking connection stability due to its own size, high installation cost of the stacking method, and the improvement of the inverter output power and battery capacity of the energy storage device is affected.

[0005] In a first aspect, the present application provides an energy storage device, comprising:

[0006] a battery pack, the battery pack being composed of a plurality of batteries connected by electrical connections;

[0007] a box having a receiving cavity for accommodating the battery pack, the box being formed by a top wall, a bottom wall and a first side wall, the top wall and the bottom wall being oppositely arranged, and the top wall and the bottom wall being respectively arranged at an intersection with the first side wall;

[0008] a first docking portion, the first docking portion comprising a first recess, the first recess being recessed from the top wall to the inside of the receiving cavity;

[0009] a second docking portion, the second docking portion comprising a protrusion, the protrusion being protruded from the bottom wall to the outside of the receiving cavity;

[0010] The handle includes a second groove recessed from the first side wall toward the first groove;

[0011] The fastener is arranged in the second groove and used to fix the first and second abutting portions;

[0012] The energy storage device can be stacked with another energy storage device in an up-down manner. When the protrusion of the energy storage device is connected with the first groove of the other energy storage device to form a limiting structure, one end of the fastener passes through the first groove of the limiting structure and is fixedly connected with the protrusion of the limiting structure.

[0013] In a possible implementation, the first groove is formed by a first abutting side and a second abutting bottom, and the protrusion includes a second abutting side and a second abutting bottom arranged in intersection. When the energy storage device is stacked with another energy storage device in an up-down manner, the first abutting side is connected with the second abutting side, and the first abutting bottom is connected with the second abutting bottom.

[0014] In a possible implementation, the first abutting portion includes a second side wall extending from the top wall to the inside of the accommodating cavity, and the first and second grooves are arranged on two sides of the second side wall. A first connecting hole is arranged on the second side wall, two ends of the first connecting hole are respectively connected with the first and second grooves, and a second connecting hole is arranged on the protrusion. One end of the fastener passes through the first connecting hole and cooperates with the second connecting hole to fix the limiting structure.

[0015] In a possible implementation, the first connecting hole is a through hole, the second connecting hole is a blind hole, the fastener includes a screw, one end of the screw passes through the through hole and is threadedly connected with the blind hole.

[0016] In a possible implementation, the screw includes a first threaded section, the blind hole is provided with a second threaded section matched with the first threaded section, and the second threaded section includes a self-locking thread.

[0017] In a possible implementation, the fastener includes a pin, one end of the pin passes through the first connecting hole and cooperates in the second connecting hole to fix the limiting structure.

[0018] In a possible implementation, the axis direction of the first connecting hole is inclined relative to the height direction of the box body, the axis direction of the second connecting hole is inclined relative to the height direction of the box body, or the axis direction of the first connecting hole is inclined relative to the length direction of the box body, the axis direction of the second connecting hole is inclined relative to the length direction of the box body, or the axis direction of the first connecting hole and the axis direction of the second connecting hole are both inclined relative to the height direction of the box body, and the axis direction of the first connecting hole and the axis direction of the second connecting hole are both inclined relative to the length direction of the box body.

[0019] In a possible implementation, the second recess is provided at least twice, and the two second recesses are oppositely arranged in the length direction of the box body; the first recess is provided at least twice, and the two first recesses correspond to the two second recesses respectively one by one; the protruding block is provided at least twice, and the two protruding blocks correspond to the two first recesses respectively one by one; the fastener is provided at least twice, and the two fasteners are arranged in the two second recesses respectively, and the two fasteners are used for connecting a group of protruding blocks and first recesses respectively.

[0020] In a possible implementation, the box body has a first end and a second end oppositely arranged in the length direction of the box body, the first recess extends from the first end of the box body to the second end of the box body, and the first recess has a first length L1 in the length direction of the box body; the protruding block is provided at least twice, and the maximum distance between the second abutting side faces of the two protruding blocks is L2, and L1=L2.

[0021] In a possible implementation, the first connecting part includes a third side wall, the third side wall is arranged to extend from the top wall to the inside of the accommodating cavity, the first recess and the second recess are arranged on two sides of the third side wall respectively, the second side wall is provided with a first through slot, and two ends of the first through slot are communicated with the first recess and the second recess respectively; the protruding block is provided with at least one second through slot, the second through slot penetrates the protruding block along the length direction of the box body; the fastener includes a first clamping piece, a second clamping piece and an elastic piece, one end of the elastic piece is connected with the first clamping piece, the other end of the elastic piece is connected with the second clamping piece, the first clamping piece is in clamping connection with the first through slot, and the second clamping piece is in clamping connection with the second through slot.

[0022] In a possible implementation, the first clamping piece includes a supporting rod and a first sleeve connected with each other, the second clamping piece includes a clamping block and a second sleeve, the first sleeve is sleeved on the outer circumferential side of the second sleeve, and the clamping block is arranged at one end of the first sleeve away from the supporting rod; the elastic piece is arranged in the first sleeve, one end of the elastic piece is fixedly connected with the supporting rod, and the other end of the elastic piece is fixedly connected with the clamping block.

[0023] Compared with the prior art, the above technical scheme provided by the embodiments of the present application has the following advantages:

[0024] The energy storage device provided in this application embodiment, during installation, firstly, the protrusion of one energy storage device and the first groove of another energy storage device are fitted together vertically to form a limiting structure, which can restrict the horizontal displacement of the two housings. Then, one end of a fastener passes through the first groove of the limiting structure and connects to the protrusion of the limiting structure, which can restrict the displacement of the second mating part relative to the first mating part in the height direction of the housing, thus achieving a fixed connection between the two energy storage devices and improving the connection stability. Connecting multiple energy storage devices in the above manner further improves the stacking stability of multiple energy storage devices. When multiple energy storage devices are stacked, they are not constrained by the size of the housing itself. Users can increase the inverter output power and battery capacity of the energy storage devices according to their needs, meeting diverse user requirements. Compared with existing technologies, this energy storage device does not require additional connecting pieces, and the fastener can be fixed to the housing, reducing the number of parts used in stacking, lowering part production and installation costs, and achieving stable and reliable stacking. Attached Figure Description

[0025] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0028] Figure 1 This is a schematic diagram of the structure of an energy storage device provided in one embodiment of this application;

[0029] Figure 2 for Figure 1 The diagram shows the stacked state of the energy storage devices.

[0030] Figure 3 For along Figure 2 A cross-sectional view along the AA direction;

[0031] Figure 4 This is a schematic diagram of the structure of an energy storage device provided in another embodiment of this application;

[0032] Figure 5 For alongFigure 4 A sectional view along the direction of B-B;

[0033] Figure 6 A structural schematic view of an energy storage device provided by another embodiment of the present application;

[0034] Figure 7 A structural schematic view of an energy storage device provided by another embodiment of the present application; Figure 6 A side view of an energy storage device;

[0035] Figure 8 A sectional view along the direction of C-C; Figure 7

[0036] A sectional view along the direction of C-C; Figure 9 Figure 6 A perspective view of an energy storage device;

[0037] Figure 10 A structural schematic view of a fastener of an energy storage device provided by another embodiment of the present application;

[0038] Figure 11 A sectional view along the direction of D-D; Figure 10

[0039] A sectional view along the direction of D-D; Figure 12

[0040] Figure 13 A structural schematic view of an energy storage device provided by another embodiment of the present application;

[0041] Explanation of reference numerals:

[0042] 1, box; 11, accommodating cavity; 12, top wall; 13, bottom wall; 14, first side wall; 101, first end; 102, second end;

[0043] 2, fastener; 21, screw; 22, pin; 23, first clamping member; 231, supporting rod; 232, first sleeve; 24, second clamping member; 241, clamping block; 242, second sleeve; 25, elastic member;

[0044] 3, first connecting portion; 31, first recess; 311, first abutting side surface; 312, first abutting bottom surface; 32, second side wall; 321, first connecting hole; 33, third side wall; 331, first through slot;

[0045] 4, second connecting portion; 41, protrusion; 411, second connecting hole; 412, second abutting side surface; 413, second abutting bottom surface; 414, second through slot;

[0046] 5, handle; 51, second recess;

[0047] 6, connecting piece.​​ Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0049] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0050] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0051] The following is an explanation of some technical terms used in this application:

[0052] Lockout screws: Lockout screws are usually a set of components, including a hand-tightening handle, a rivet sleeve, and a screw. After special combinations, they form different lockout screw panel fasteners. They achieve the purpose of preventing loosening by restricting the relative movement between the threaded pairs or increasing the difficulty of relative movement.

[0053] Battery pack (PACK): refers to a battery system composed of multiple battery monomers according to a certain configuration and connection mode. Such combination can provide higher voltage, capacity or power output to meet the needs of specific applications.

[0054] In the related art, one solution is that the stacking of battery packs or battery packs and other modules is only clamped by convex caps, protrusions and other limiting structures. The problem of this method is that the size of the system and the module monomer in the stacking direction cannot be too large, otherwise the limiting structure such as convex cap protrusion cannot stably fix each module. Figure 13 As shown, another solution is to increase additional connecting pieces 6 and screws for fastening on the basis of the above solution. The connecting pieces 6 are arranged around the matching surface of the box. This method increases the connecting pieces 6 and the corresponding screws, resulting in higher costs of parts and materials and higher costs of part installation. Since the connecting pieces 6 need to be pressed against the box to achieve fixation, the area of the connecting pieces 6 pressing region greatly affects the stability of the stacking. When the module height size is very large, the size of the connecting pieces 6 also needs to be increased, which will occupy a larger area of the box, causing difficulties in structural design.

[0055] In order to solve the technical problem that the existing energy storage device has poor stacking connection stability due to its own size, high installation cost, and the improvement of the inverter output power and battery capacity of the energy storage device is affected, the present application provides an energy storage device which can reduce the number of parts used for stacking, reduce the cost, and realize stable and reliable stacking. It can improve the inverter output power and battery capacity of the energy storage device according to the demand, and meet the differentiated needs of users.

[0056] Figure 1The energy storage device provided in the application comprises a battery pack, a box body 1, a first docking part 3, a second docking part 4, a handle 5 and a fastener 2, the battery pack is composed of a plurality of batteries through electrical connection; the box body 1 has a containing cavity 11 accommodating the battery pack, the box body 1 comprises a top wall 12, a bottom wall 13 and a first side wall 14, the top wall 12 and the bottom wall 13 are oppositely arranged, and the top wall 12 and the bottom wall 13 are respectively arranged to intersect the first side wall 14; the first docking part 3 comprises a first groove 31, the first groove 31 is recessed from the top wall 12 to the inside of the containing cavity 11; the second docking part 4 comprises a protrusion 41, the protrusion 41 is protruded from the bottom wall 13 to the outside of the containing cavity 11; the first groove 31 and the protrusion 41 are configured to be fitted with each other; the handle 5 comprises a second groove 51, the second groove 51 is recessed from the first side wall 14 to the direction close to the first groove 31; the fastener 2 is arranged in the second groove 51, and the fastener 2 is used for fixing the first docking part 3 and the second docking part 4; wherein the energy storage device can be arranged in a stacked manner with another energy storage device, in the case that the protrusion 41 of the energy storage device and the first groove 31 of the other energy storage device are fitted and connected to form a limiting structure, one end of the fastener 2 passes through the first groove 31 of the limiting structure and is fixedly connected with the protrusion 41 of the limiting structure.

[0057] For the convenience of description and understanding, the height direction of the box body 1 can be the Z direction shown in the figure, the length direction of the box body 1 can be the X direction shown in the figure, and the two sides of the height direction of the box body 1 are respectively the upper and lower sides. It can be understood that when some application scenarios need to expand the battery capacity or output power, at least two box bodies 1 can be stacked in the height direction.

[0058] Exemplarily, the top wall 12 and the bottom wall 13 of the box body 1 are oppositely arranged in the height direction of the box body 1, so that the first docking part 3 and the second docking part 4 are oppositely arranged in the height direction of the box body 1. As Figure 2As shown, during installation, the energy storage device is first stacked vertically with another energy storage device, that is, the protrusion 41 of the energy storage device is fitted and connected with the first groove 31 of the other energy storage device to form a limiting structure, thereby restricting the horizontal displacement of the two energy storage devices. For ease of explanation and understanding, the energy storage device located below is called the first energy storage device, and the energy storage device located above is called the second energy storage device. Next, one end of the fastener 2 is passed through the first groove 31 of the first energy storage device and connected to the protrusion 41 of the second energy storage device, with the second groove 51 facing towards the first groove 31. The extended arrangement allows the fastener 2 to smoothly securely connect the first groove 31 and the protrusion 41, thereby limiting the displacement of the second mating part 4 relative to the first mating part 3 in the height direction of the housing 1. This achieves a fixed connection between the first and second energy storage devices, improving the connection stability of the two energy storage devices. Similarly, connecting multiple energy storage devices in the above manner can improve the stacking stability of multiple energy storage devices. When multiple energy storage devices are stacked, they are not constrained by the size of the housing 1 itself. Users can increase the inverter output power and battery capacity of the energy storage devices according to their needs, meeting their differentiated requirements. Compared with the prior art, this energy storage device does not require the additional connecting piece 6, which reduces the number of parts used in stacking, lowers costs, and enables stable and reliable stacking.

[0059] In addition, such as Figure 1 As shown, by setting the handle 5, on the one hand, the handle 5 can facilitate the handling of the box 1. On the other hand, since the fastener 2 is set in the second groove 51, the second groove 51 has enough operating space to install the fastener 2. Hiding the fastener 2 in the second groove 51 can also improve the overall aesthetics of the energy storage device.

[0060] It should be noted that the shape of the box 1 can be set as a cuboid or a cylinder, and this application does not impose any specific restrictions on it.

[0061] In some embodiments, such as Figure 1As shown, the protrusion 41 has a first height in the height direction of the box 1, and the first recess 31 has a first depth in the height direction of the box 1, and the first height can be set to be equal to the first depth. The first recess 31 can be circular, and the protrusion 41 is correspondingly set to be cylindrical, so that the protrusion 41 can be exactly fitted into the first recess 31; the first recess 31 can be square, and the protrusion 41 is correspondingly set to be cuboid, so that the protrusion 41 can be exactly fitted into the first recess 31; of course, the first recess 31 and the protrusion 41 can also be set to other shapes. It can be understood that when the energy storage device and another energy storage device are stacked up and down, the energy storage device located below is called the first energy storage device, and the energy storage device located above is called the second energy storage device. Since the first height is equal to the first depth, the protrusion 41 of the second energy storage device can be stably fitted into the first recess 31 of the first energy storage device, thereby limiting the displacement of the second energy storage device relative to the first energy storage device in the horizontal direction, wherein the top wall 12 of the first energy storage device and the bottom wall 13 of the second energy storage device are in contact with each other, and the top wall 12 and the bottom wall 13 of the box 1 can be respectively set to be flat. In this way, the contact area between the two energy storage devices can be increased, thereby improving the stacking stability of multiple energy storage devices.

[0062] In some embodiments, as shown in Figure 1 and Figure 2 The first recess 31 is formed by a first abutting side surface 311 and a first abutting bottom surface 312, and the protrusion 41 includes a second abutting side surface 412 and a second abutting bottom surface 413 which are intersectingly arranged; when the energy storage device is stacked with another energy storage device, the first abutting side surface 311 is connected in abutment with the second abutting side surface 412, and the first abutting bottom surface 312 is connected in abutment with the second abutting bottom surface 413. In this way, the contact area between the two energy storage devices can be increased, thereby improving the stacking stability of multiple energy storage devices.

[0063] In some embodiments, the first connecting part 3 includes a second side wall 32 which extends from the top wall 12 to the inside of the accommodating cavity 11, and the first recess 31 and the second recess 51 are respectively arranged on both sides of the second side wall 32, and at least a part of the first abutting side surface 311 of the first recess 31 is defined by the second side wall 32; the second side wall 32 is provided with a first connecting hole 321 which is in communication with the first recess 31 and the second recess 51 at both ends thereof, and the protrusion 41 is provided with a second connecting hole 411; one end of the fastener 2 passes through the first connecting hole 321 and cooperates with the second connecting hole 411 to fix the limiting structure.

[0064] Specifically, in one embodiment, as shown in Figure 2 and Figure 3As shown, the first connecting hole 321 is a through hole, and the second connecting hole 411 is a blind hole. The fastener 2 includes a screw 21, one end of which passes through the through hole and is threadedly connected to the blind hole. It can be understood that during installation, the protrusion 41 of the energy storage device is first fitted into the first groove 31 of another energy storage device to form a limiting structure. This limiting structure restricts the horizontal displacement of the two housings 1. Then, one end of the screw 21 passes through the through hole of this limiting structure and is threadedly connected to the blind hole of the limiting structure, thus achieving a fixed connection between the two energy storage devices. This improves the stacking stability of multiple energy storage devices, and the stacking of multiple energy storage devices is not constrained by the size of the housing 1 itself. Users can increase the inverter output power and battery capacity of the energy storage devices according to their needs, meeting their differentiated requirements.

[0065] Furthermore, the screw 21 includes a first threaded section, and the blind hole is provided with a second threaded section that mates with the first threaded section. The second threaded section includes a self-locking thread. Specifically, the root of the second threaded section has a 30° wedge-shaped slope, which is the self-locking thread. When the first threaded section of the screw and the second threaded section of the blind hole are tightened together, the tip of the screw 21 presses firmly against the wedge-shaped slope of the self-locking thread, thereby generating a large locking force. Due to the change in the angle of the thread profile, the normal force generated by the contact between the threads forms a 60° angle with the screw axis, instead of the 30° angle of ordinary threads. Obviously, the normal pressure of the self-locking thread is much greater than the tightening pressure, so the anti-loosening friction force generated is necessarily greatly increased. That is to say, when multiple boxes are stacked, under impact, vibration, or variable load, or when the temperature changes greatly, the threaded connection still maintains a friction force that prevents relative movement, thereby achieving an anti-loosening effect and further improving the stacking stability of multiple boxes.

[0066] It should be noted that the second sidewall 32 may be provided with multiple first connecting holes 321, and correspondingly, the protrusion 41 may be provided with multiple second connecting holes 411. The multiple second connecting holes 411 correspond one-to-one with the multiple first connecting holes 321, and multiple screws 21 can be connected accordingly during installation to improve stacking stability. The first connecting holes may be countersunk holes, so that the head of the screw 21 is embedded in the first connecting hole, avoiding the screw 21 from being exposed, preventing the screw 21 from loosening, and improving the aesthetics of the connection.

[0067] In one embodiment, such as Figure 4 and Figure 5As shown, the fastener 2 includes a pin 22, one end of the pin 22 passes through the first connecting hole 321 and is matched in the second connecting hole 411 to fix the limiting structure. The pin 22 can adopt a cylindrical pin, a conical pin, etc., and the pin 22 and the second connecting hole 411 can be designed as an interference fit. It can be understood that, during installation, first, the protrusion 41 of the energy storage device is embedded and connected with the first groove 31 of another energy storage device up and down to form a limiting structure, the limiting structure can limit the horizontal displacement of the two box bodies 1, then one end of the pin 22 passes through the first connecting hole 321 of the limiting structure and is matched with the second connecting hole 411 of the limiting structure, and the friction between the pin 22 and the second connecting hole 411 is used to fix the limiting structure, so as to realize the fixed connection of the two box bodies 1, improve the stacking stability of the plurality of energy storage devices, and the plurality of energy storage devices can not be restricted by the size of the box body 1 during stacking, and the user can improve the inverter output power and the battery capacity of the energy storage device according to the demand, so as to meet the differentiated needs of users.

[0068] Further, the axis direction of the first connecting hole 321 is inclined relative to the height direction of the box body 1, and the axis direction of the second connecting hole 411 is inclined relative to the height direction of the box body 1. Preferably, one end of the pin 22 inserted into the second connecting hole 411 is inclined downward, first, the downward inclination can prevent the pin 22 from being accidentally dropped due to impact, vibration or variable load, and second, the pin 22 is equipped with a gap, if not inclined, when the upper box body 1 is lifted upward, the pin 22 may be dropped away from the first accommodating cavity 11 due to the existence of the assembly gap.

[0069] In addition, the axis direction of the first connecting hole 321 is inclined relative to the length direction of the box body 1, and the axis direction of the second connecting hole 411 is inclined relative to the length direction of the box body 1, that is, the pin 22 is also inclined in the front-rear direction of the box body 1. In this way, the shear area of the pin 22 when the upper box body 1 is lifted upward can be increased, and the pin 22 can be prevented from being broken. In the case of limited size, the inclination angle can also be increased to increase the shear area, and then the diameter of the pin 22 is reduced. The inclination angle is set to be within 5°. If the structure of the box body 1 of the energy storage device is special, the size of the inclination angle can be flexibly adjusted according to the actual demand.

[0070] In some embodiments, the second recess 51 is provided at least twice, and the two second recesses 51 are oppositely arranged in the length direction of the box 1; the first recess 31 is provided at least twice, and the two first recesses 31 correspond to the two second recesses 51 respectively; the protrusion 41 is provided at least twice, and the two protrusions 41 correspond to the two first recesses 31 respectively; the fastener 2 is provided at least twice, and the two fasteners 2 are arranged in the two second recesses 51 respectively, and the two fasteners 2 are used for connecting a group of protrusions 41 and first recesses 31 respectively. The first side wall 14 on the left and right sides of the box 1 is provided with the second recess 51 respectively. The two second recesses 51 are arranged, on the one hand, to facilitate carrying, and on the other hand, to facilitate the installation of the fastener 2, thereby improving the stacking stability.

[0071] In one example, as shown in Figure 3 , first, the two protrusions 41 of the energy storage device are embedded and connected with the two first recesses 31 of another energy storage device one by one, and then one end of one screw 21 is threaded through the through hole on the left side of the first energy storage device and is screwed into the blind hole on the left side of the second energy storage device, while the other end of the other screw 21 is threaded through the through hole on the right side of the first energy storage device and is screwed into the blind hole on the right side of the second energy storage device. Figure 5 In another example, as shown in Figure 5 , first, the two protrusions 41 of the energy storage device are embedded and connected with the two first recesses 31 of another energy storage device one by one, and then one end of one pin 22 is threaded through the first connecting hole on the left side of the first energy storage device and is interference-fitted into the second connecting hole 321 on the left side of the second energy storage device, while the other end of the other pin 22 is threaded through the first connecting hole 321 on the right side of the first energy storage device and is interference-fitted into the second connecting hole 411 on the right side of the second energy storage device. In this way, after the multiple boxes 1 are connected in a top-down manner, the two groups of fasteners 2 are used to connect the protrusions 41 from the left side and the right side of the box 1 respectively, so as to realize the fixed connection of the two energy storage devices and improve the stacking stability.

[0072] In one embodiment, as shown in Figure 6 and Figure 7 , the box 1 has a first end 101 and a second end 102 oppositely arranged in the length direction of the box 1, the first recess 31 extends from the first end 101 of the box 1 to the second end 102 of the box 1, and the first recess 31 has a first length L1 in the length direction of the box 1; the protrusion 41 is provided with two, and the maximum distance between the second abutting sides 412 of the two protrusions 41 is L2, and L1=L2. Figure 8As shown, it can be understood that after the protrusion 41 of the energy storage device is embedded and connected with the first groove 31 of another energy storage device in an up-down manner, the second abutting side surface 412 of the two protrusions 41 of the second energy storage device can be respectively abutted and connected with the first abutting side surface 311 of the first energy storage device. In this way, the horizontal displacement of the second energy storage device relative to the first energy storage device can be prevented.

[0073] In addition, the protrusions 41 of the battery pack boxes 1 of different manufacturers have different sizes. The first groove 31 extends from the first end 101 of the box 1 to the second end 102 of the box 1, so that most of the battery packs on the market can be stacked on the first groove 31 of the box 1. In this way, different models of battery packs can be compatible, the universality of the energy storage device is improved, and the differentiated needs of users can be better met.

[0074] In one embodiment, as shown in the drawings, Figures 9 to 11 As shown, the first connecting part 3 includes a third side wall 33 extending from the top wall 12 to the inside of the accommodating cavity 11. The first groove 31 and the second groove 51 are respectively arranged on the two sides of the third side wall 33. At least a part of the first abutting side surface 311 of the first groove 31 is defined by the third side wall 33. The third side wall 33 is provided with a first through groove 331, and the two ends of the first through groove 331 are respectively communicated with the first groove 31 and the second groove 51. The protrusion 41 is provided with at least one second through groove 414 penetrating the protrusion 41 along the length direction of the box 1. The fastener 2 includes a first clamping piece 23, a second clamping piece 24, and an elastic piece 25. One end of the elastic piece 25 is fixedly connected with the first clamping piece 23, and the other end of the elastic piece 25 is fixedly connected with the second clamping piece 24. The first clamping piece 23 is clamped and connected with the first through groove 331, and the second clamping piece 24 is clamped and connected with the second through groove 414. It can be understood that during installation, first, the protrusion 41 of the energy storage device is embedded and connected with the first groove 31 of another energy storage device in an up-down manner, so as to limit the horizontal displacement of the two boxes 1. Then, the first clamping piece 23 is held, an external force is applied to the first clamping piece 23, the second clamping piece 24 slides relative to the first clamping piece 23 in a direction close to the first through groove 331, the first clamping piece 23 is clamped and connected with the first through groove 331 of the first energy storage device, and at this time the elastic piece 25 is stretched under the action of the external force. Then, the external force is released, the second clamping piece 24 is loosened, and the second clamping piece 24 automatically approaches the first clamping piece 23 under the action of the elastic restoring force of the elastic piece 25 and is clamped and connected with the second through groove 414 of the second energy storage device. Under the action of the elastic force of the elastic piece 25, the first clamping piece 23 and the second clamping piece 24 respectively provide a fastening force to the two boxes 1, so as to realize the fixed connection of the two energy storage devices and improve the stacking stability of the multiple energy storage devices.

[0075] In addition, the second through-slots 414 are provided in plurality and are arranged at intervals. The cabinet 1 can take in air from the side first through-slots 331, and then from the second through-slots 414 into the first recesses 31, which is conducive to heat dissipation of the battery pack, thereby improving the problem of easy overheating at the stacking position of the battery pack.

[0076] In one embodiment, as shown in Figure 10 and Figure 11 The first clamping piece 23 comprises a connecting support rod 231 and a first sleeve 232, the second clamping piece 24 comprises a clamping block 241 and a second sleeve 242, the first sleeve 232 is slidingly sleeved on the outer circumferential side of the second sleeve 242, and the clamping block 241 is arranged at one end of the first sleeve 232 away from the support rod 231; the elastic member 25 is arranged in the first sleeve 232, one end of the elastic member is connected with the support rod 231, and the other end of the elastic member 25 is fixedly connected with the clamping block 241. The length direction of the support rod 231 and the axial direction of the first sleeve 232 can be perpendicular to each other, and the first sleeve 232 is slidingly sleeved on the outer circumferential side of the second sleeve 242, that is, the distance between the clamping block 241 and the support rod 231 can be adjusted. It can be understood that, as shown in Figure 12 , first, the protrusion 41 of the energy storage device is embedded and connected with the first recess 31 of another energy storage device up and down to form a limiting structure, thereby limiting the horizontal displacement of the two cabinets 1; then the first sleeve 232 is held, an external force is applied to the second sleeve 242, so that the second sleeve 242 slides relative to the first sleeve 232, the clamping block 241 moves away from the support rod 231, and the elastic member 25 is stretched at this time; then the clamping block 241 passes through the first through-slots 331 of the limiting structure and the second through-slots 414 of the limiting structure in sequence from the second recess 51 and extends into the first recess 31 of the first energy storage device, and the first sleeve 232 is rotated, so that the clamping block 241 hooks the protrusion 41 of the second energy storage device; the length of the support rod 231 is greater than the length of the first through-slots 331, so that the support rod 231 can be clamped and connected with the second side wall 33 of the first energy storage device, and under the action of the elastic force of the elastic member 25, the clamping block 241 moves towards the support rod 231, thereby providing a fastening force to the cabinet 1 and improving the stacking stability of the plurality of cabinets 1.

[0077] It should be noted that the elastic member 25 can be a spring or an elastic rod made of elastic material, which is not specifically limited in the present application.

[0078] Of course, other models of battery packs can be stacked on the first recess 31 of the cabinet 1, as long as the clamping block 241 can hook the protrusion 41 or other protruding structures at the bottom of the battery pack, so as to realize fixation.

[0079] It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order

[0080] Although the terms first, second, third, etc. can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first", "second", and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

[0081] The foregoing is merely illustrative of the principles of the application and various modifications can be made by those skilled in the art without departing from the spirit and scope of the application. The above embodiments are illustrative, and not restrictive, of the scope of the application. Thus, it is intended that the application cover any and all modifications of the application within the scope of the claims and their equivalents.

Claims

1. An energy storage device, characterized in that, include: A battery pack, wherein the battery pack is composed of multiple batteries connected electrically; The housing has a cavity for accommodating the battery pack. The housing is formed by a top wall, a bottom wall, and a first side wall. The top wall and the bottom wall are disposed opposite to each other, and the top wall and the bottom wall are respectively disposed intersecting with the first side wall. A first docking portion, the first docking portion including a first groove, the first groove being recessed from the top wall toward the interior of the receiving cavity; The second docking part includes a protrusion that protrudes from the bottom wall toward the outside of the housing. The handle includes a second groove, which is recessed from the sidewall toward the direction of the first groove; A fastener, wherein the fastener is disposed in the second groove, for fixing the first mating portion and the second mating portion; The energy storage device can be stacked vertically with another energy storage device. When the protrusion of the energy storage device is engaged with the first groove of the other energy storage device to form a limiting structure, one end of the fastener passes through the first groove of the limiting structure and is fixedly connected to the protrusion of the limiting structure.

2. The energy storage device according to claim 1, characterized in that, The first groove is formed by a first abutting side surface and a first abutting bottom surface, and the protrusion includes a second abutting side surface and a second abutting bottom surface that intersect each other; When the energy storage device is stacked on top of another energy storage device, the first abutting side is connected to the second abutting side, and the first abutting bottom surface is connected to the second abutting bottom surface.

3. The energy storage device according to claim 2, characterized in that, The first docking portion includes a second sidewall, which extends from the top wall toward the interior of the accommodating cavity. The first groove and the second groove are respectively disposed on both sides of the second sidewall. A first connecting hole is provided on the second sidewall, and the two ends of the first connecting hole are respectively connected to the first groove and the second groove. A second connecting hole is provided on the protrusion. One end of the fastener passes through the first connecting hole and then cooperates with the second connecting hole to fix the limiting structure.

4. The energy storage device according to claim 3, characterized in that, in, The first connecting hole is a through hole, the second connecting hole is a blind hole, and the fastener includes a screw, one end of which passes through the through hole and is threadedly connected to the blind hole.

5. The energy storage device according to claim 4, characterized in that, The screw includes a first threaded section, and the blind hole is provided with a second threaded section that mates with the first threaded section, the second threaded section including a self-locking thread.

6. The energy storage device according to claim 3, characterized in that, The fastener includes a pin, one end of which passes through the first connecting hole and engages in the second connecting hole to fix the limiting structure.

7. The energy storage device according to claim 6, characterized in that, The axial direction of the first connecting hole is inclined relative to the height direction of the box body, and the axial direction of the second connecting hole is also inclined relative to the height direction of the box body. Alternatively, the axial direction of the first connecting hole is inclined relative to the length direction of the box, and the axial direction of the second connecting hole is inclined relative to the length direction of the box. Alternatively, the axial directions of the first connecting hole and the second connecting hole are both inclined relative to the height direction of the housing, and the axial directions of the first connecting hole and the second connecting hole are both inclined relative to the length direction of the housing.

8. The energy storage device according to any one of claims 2 to 7, characterized in that, At least two second grooves are provided, and the two second grooves are arranged opposite each other in the length direction of the housing; at least two first grooves are provided, and the two first grooves correspond one-to-one with the two second grooves; at least two protrusions are provided, and the two protrusions correspond one-to-one with the two first grooves; at least two sets of fasteners are provided, and the two sets of fasteners are respectively provided in the two second grooves, and the two sets of fasteners are used to connect one set of protrusions and the first groove respectively.

9. The energy storage device according to claim 2, characterized in that, The box has a first end and a second end that are disposed opposite to each other in its length direction, and the first groove extends from the first end of the box to the second end of the box, and the first groove has a first length L1 in the length direction of the box. Two protrusions are provided, and the maximum distance between the second abutting sides of the two protrusions is L2, where L1 = L2.

10. The energy storage device according to claim 9, characterized in that, The first docking portion includes a third sidewall, which extends from the top wall toward the interior of the accommodating cavity. The first groove and the second groove are respectively disposed on both sides of the third sidewall. The third sidewall is provided with a first through groove, the two ends of which are respectively connected to the first groove and the second groove. The protrusion is provided with at least one second through groove, which extends through the protrusion along the length of the housing. The fastener includes a first snap-fit ​​member, a second snap-fit ​​member, and an elastic member. One end of the elastic member is connected to the first snap-fit ​​member, and the other end of the elastic member is connected to the second snap-fit ​​member. The first snap-fit ​​member is snap-fitted into the first through slot, and the second snap-fit ​​member is snap-fitted into the second through slot.

11. The energy storage device according to claim 10, characterized in that, The first snap-fit ​​component includes a connected support rod and a first sleeve, and the second snap-fit ​​component includes a snap block and a second sleeve. The first sleeve is slidably sleeved on the outer periphery of the second sleeve, and the snap block is disposed at the end of the first sleeve away from the support rod. The elastic element is disposed inside the first sleeve, one end of the elastic element is fixedly connected to the support rod, and the other end of the elastic element is fixedly connected to the locking block.

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