An energy storage device

Abstract

This utility model relates to the field of electrical energy storage technology, and provides an energy storage device, comprising: a housing having multiple outer side walls and a closed space enclosed by the multiple outer side walls; a battery cell assembly disposed within the closed space for storing electrical energy; an electrical connection component including an electrical interface disposed on the housing and exposed to the outside of the housing, the electrical interface being electrically connected to the battery cell assembly; a first buffer assembly having an outer surface exposed to the outside of the housing and an inner surface forming the closed space on each of the multiple outer side walls, the first buffer assembly having a buffer portion made of buffer material on the outer surface of each outer side wall; and a second buffer assembly including multiple buffer blocks made of buffer material, each buffer block being disposed within the closed space. This utility model can improve the safety protection level of existing power supply equipment and minimize the safety risks caused by collisions.

Description

Technical Field

[0001] This utility model relates to the field of electrical energy storage technology, and in particular to an energy storage device. Background Technology

[0002] There are various types of power supply devices available today, used in all aspects of modern electronic products. Many electronic products are prone to insufficient power supply during outdoor activities. Therefore, to adapt to outdoor usage conditions, there are external power supply devices on the market that can be used outdoors to provide power to the electronic products needed to meet their power requirements.

[0003] However, since the energy storage cells inside the power supply equipment may be at risk of explosion and combustion, sufficient protective measures need to be designed for the power supply equipment. When external power supply equipment is used outdoors, it needs to be moved around, and during the movement, collisions and frictions are sometimes unavoidable. Although the existing technology wraps some cushioning material around the cells of the power supply equipment, there is still a possibility of combustion and fire due to collisions. The protection level is low and it is easy to cause risks. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide an energy storage device to improve the safety protection level of existing power equipment and avoid safety risks caused by collisions as much as possible.

[0005] This utility model provides an energy storage device, comprising: a housing having a plurality of outer side walls and a closed space enclosed by the plurality of outer side walls; a battery cell assembly disposed within the closed space for storing electrical energy; an electrical connection component including an electrical interface disposed on the housing and exposed on the outside of the housing, the electrical interface being electrically connected to the battery cell assembly; a first buffer assembly having an outer surface exposed on the outside of the housing and an inner surface forming the closed space on each of the plurality of outer side walls, the first buffer assembly having a buffer portion made of a buffer material on the outer surface of each of the outer side walls; and a second buffer assembly including a plurality of buffer blocks made of a buffer material, each of the buffer blocks being disposed within the closed space; wherein the plurality of outer side walls include one outer side wall containing the electrical interface and the remaining outer side walls not containing the electrical interface, and each of the buffer blocks is arranged between the inner surface of each of the remaining outer side walls (excluding the one outer side wall) and the surface of the electrical component opposite to that outer side wall.

[0006] According to the energy storage device provided in this embodiment, a first buffer assembly is provided on the outer side of the housing as an outer protective layer, and a second buffer assembly is provided on the inner side of the housing as an inner protective layer. When an external impact occurs, the first buffer assembly first receives the impact force and initially reduces the impact fluctuation, transmitting the fluctuation to the entire outer wall. Subsequently, the outer wall utilizes the second buffer assembly to cover the impact force onto each buffer block, thereby further reducing the destructive force of the impact on the battery cell assembly. Furthermore, eliminating the buffer block arrangement at the side wall location of the electrical interface reduces the space occupied by the buffer block on the connection structure between the electrical interface and the battery cell assembly. This also prevents sparks generated during external power input or output from igniting the buffer block and causing internal safety accidents, ensuring improved collision protection while reducing the risk of internal combustion during charging and discharging.

[0007] In a preferred embodiment of this invention, at least two alternately arranged buffer blocks are provided between the inner surface of each of the remaining outer side walls and the surface of the battery cell assembly opposite to the outer side wall.

[0008] In a preferred embodiment of the present invention, a clearance space is provided between each of the outer sidewalls and the surface of the battery cell assembly, and a buffer block on the inner side of the same outer sidewall is disposed within the clearance space; wherein, when viewed in a direction perpendicular to the outer sidewall, the buffer block coincides with a portion of the surface of the battery cell assembly, and the portion of the surface has a flow gap with at least one edge on the opposite side of the surface of the battery cell assembly.

[0009] In a preferred embodiment of this invention, the buffer block is made of foam material.

[0010] In a preferred embodiment of this utility model, the plurality of outer sidewalls include a plurality of first sidewalls arranged around to form a closed side of the enclosed space and two second sidewalls for covering opposite ends of the closed side; the housing includes a detachably fitted cover member and a support plate, a plurality of fixing structures are provided between the cover member and the support plate, each fixing structure is respectively disposed in the clearance space between the first sidewall and the battery cell assembly, and at least two buffer blocks are provided in the clearance space containing the fixing structures and distributed on both sides of the fixing structures.

[0011] In a preferred embodiment of the present invention, at least two buffer blocks arranged in a first direction and extending in a second direction are provided in the clearance space between one of the second sidewalls and the battery cell assembly, and at least two buffer blocks arranged in the second direction and extending in the first direction are provided in the clearance space between the other second sidewall and the battery cell assembly; the first direction is perpendicular to the second direction.

[0012] In a preferred embodiment of this utility model, the two buffer blocks in the clearance space corresponding to one of the second sidewalls are respectively close to the opposite ends of one of the second sidewalls in the first direction, and the two buffer blocks in the clearance space corresponding to the other second sidewall are respectively close to the opposite ends of the other second sidewall in the second direction.

[0013] In a preferred embodiment of the present invention, a display connected to the battery cell assembly is further included. The display is disposed between one of its outer side walls and the surface of the battery cell assembly and has a display screen portion exposed on the outer side surface of the outer side wall.

[0014] In a preferred embodiment of the present invention, the first buffer assembly includes a plurality of protective pads, a connecting angle is formed between three adjacent outer sidewalls, the protective pads are attached to the connecting angle and have buffer portions extending to the three outer sidewalls corresponding to the connecting angle.

[0015] In a preferred embodiment of the present invention, the electrical interface further includes a power input interface and a power output interface arranged on one of its outer side walls.

[0016] Other features and advantages of the present invention will be set forth in the following description and will be apparent in part from the description or may be learned by practicing the technical solution of the present invention. The objects and other advantages of the present invention may be realized and obtained by means of the structures and / or processes particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the energy storage device provided in an embodiment of the present invention;

[0018] Figure 2 This is a partially exploded structural diagram of the energy storage device provided in an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the internal structure of the energy storage device provided in an embodiment of the present invention from a first-view perspective.

[0020] Figure 4 This is a schematic diagram of the internal structure of the energy storage device provided in an embodiment of the present invention from a second perspective.

[0021] Figure 5 This is a schematic diagram of the internal structure of the energy storage device provided in an embodiment of the present invention from a third-person perspective.

[0022] Explanation of icon numbers: 100 Shell, 101 Cover component, 102 Bearing plate, 103 Fixing structure, 104 Connecting angle, 110 Enclosed space, 120 Front side wall, 130 Rear side wall, 140 Left side wall, 150 Right side wall, 160 Upper side wall, 170 Lower side wall, 180 Clearance space, 190 Flow interval; 200 battery cell assembly, 210 battery cell, 220 power-on connection board, 230 power-off connection board; 300 electrical connection components, 310 electrical interfaces; 400 First buffer component, 410 Protective pad; 500 Second Buffer Component, 510 Buffer Block; 600 explosion-proof valve; 700 monitor and 710 display screen. Detailed Implementation

[0023] The following detailed description of the embodiments of this utility model, in conjunction with the accompanying drawings, will provide a thorough understanding of how this utility model uses technical means to solve technical problems and achieve technical effects, enabling its implementation. It should be noted that these specific descriptions are merely intended to facilitate a clearer understanding of this utility model by those skilled in the art, and are not intended to limit its scope. For example, the use of "first" and "second" in the embodiments of this utility model is not intended to limit its application, but merely to indicate the serial numbers of multiple identical or similar devices or mechanisms. Those skilled in the art can readjust these serial numbers for ease of description or during the organization of technical solutions. Furthermore, alternative solutions are described for some mechanisms in different embodiments, and these alternatives can be applied to other identical or similar devices or mechanisms. As long as there is no conflict, the various embodiments and features in each embodiment of this utility model can be combined with each other, and the resulting technical solutions are all within the protection scope of this utility model.

[0024] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] See Figures 1 to 5 This utility model provides an energy storage device in an embodiment, capable of storing electrical energy and releasing it to an external circuit. It includes a housing 100, a battery cell assembly 200, and an electrical connection assembly 300. The housing 100 has multiple outer sidewalls that are adjacent to each other to form a closed space 110. The battery cell assembly 200 is disposed within the closed space 110 and protected by the housing 100. The battery cell assembly 200 is used to store electrical energy and consists of at least one battery cell 210. Each battery cell 210 contains a chemical energy storage material, such as lithium iron phosphate, which is connected in series to form the power supply terminal of the battery cell assembly 200. Figure 2In this assembly, the individual battery cells 210 are arranged in a square array to form the energy storage section of the battery cell assembly 200. The battery cell assembly 200 also includes an upper electrical connection plate 220 and a lower electrical connection plate 230, both of which are in electrical contact with the battery cells 210. The internal circuit structure of both plates connects the battery cells 210 in series to supply electrical energy. In this embodiment, the housing 100 is made of ABS plastic, which has high rigidity, high hardness, and is lightweight. Of course, other suitable materials can also be used, and no limitation is made here.

[0026] The electrical connection component connects the battery cell assembly 200 to an external circuit, which can be a DC power supply, AC power supply, 220V AC power, or other electronic equipment. The electrical connection component includes an electrical interface 310 disposed on the housing 100 and exposed on its outer side. The electrical interface 310 is used for charging and discharging. When connected to an external power circuit, the battery cell assembly 200 is in a charging state, storing electrical energy in its individual cells. When connected to external electronic devices or other electrical products, the battery cell assembly 200 releases electrical energy, allowing it to flow to the electrical product via the electrical interface 310. The electrical interface 310 can be a single unit, simultaneously serving both charging and discharging functions. It switches to a charging circuit when connected to an external power circuit and to a discharging circuit when connected to an electrical product. This switching method is already implemented in existing technology and will not be described in detail here. In this embodiment, refer to... Figure 1 and Figure 2 The electrical interface 310 is provided with multiple interfaces, at least one of which is used for charging and at least one for discharging. It includes a power input interface and a power output interface. The power input interface used for discharging can use the XT90E-F charging interface, and the power output interface used for discharging can use the XT90E-M discharging interface. The charging interface can be charged through an external transformer, or the voltage can be converted to a voltage suitable for the battery cell through an internal transformer to charge the battery cell assembly 200. During discharging, one of the charging interfaces in this embodiment uses a 24V discharging interface. Of course, other discharging interfaces using different voltages or compatible models can be reasonably set according to the usage scenario. No further limitations are made here.

[0027] In this embodiment of the invention, the energy storage device further includes a first buffer assembly 400 disposed on the outside of the housing 100 and a second buffer assembly 500 disposed on the inside of the housing 100. Specifically, the outer wall of the housing 100 has an outer surface exposed on the outside of the housing 100 and an inner surface located within the enclosed space 110 to form the wall of the enclosed space 110. The first buffer assembly 400 has a buffer portion made of buffer material on the outer surface of each outer wall. The buffer material can be a plastic material, rubber material, resin material, or other material used for buffering and protection. (See reference...) Figure 1 and Figure 2The buffer portion covers at least a part of the outer surface of the outer wall, ensuring that when the outer wall collides with an external component, there is a buffer between the outer wall and the external surface it is attached to, mitigating the impact and preventing direct impact on the outer wall during uneven handling, such as during vehicle transport. The presence of buffer material on each outer wall facilitates comprehensive impact protection for the housing 100. The buffering effect is achieved regardless of which outer wall it is attached to. Furthermore, during vibrations of the housing 100, it may roll from one outer wall to another, thus ensuring safe impact protection regardless of which outer wall it is attached to, comprehensively enhancing the safety level.

[0028] Continue reading Figures 3 to 5 The second buffer assembly 500 includes buffer blocks 510 made of multiple buffer materials. The buffer materials of these buffer blocks 510 can be different from those in the buffer portion of the first buffer assembly 400, such as foam or expanded plastic. Alternatively, they can be the same as those in the first buffer assembly 400, all within the scope of this invention. Each buffer block 510 is disposed within the enclosed space 110 and located between the battery cell assembly 200 and the outer wall, thereby filling the space between the battery cell assembly 200 and the outer wall to achieve a safe and shock-absorbing effect. The electrical interface 310, whether one or more are provided, can be located on one of the outer walls, while the remaining outer walls are those without an electrical interface 310. Figure 1In the housing 100, a front sidewall 120, a rear sidewall 130, a left sidewall 140, a right sidewall 150, an upper sidewall 160, and a lower sidewall 170 are respectively provided in various directions. The electrical interface 310 is provided on the front sidewall 120, so the front sidewall 120 is one of its outer sidewalls, and the other outer sidewalls are the rear sidewall 130, the left sidewall 140, the right sidewall 150, the upper sidewall 160, and the lower sidewall 170. Based on this, each buffer block 510 is arranged between the remaining outer walls and the battery cell assembly 200, respectively close to the inner surface of each of the remaining outer walls and the surface of the electrical component opposite to the inner surface, so as to form a buffering effect between the remaining outer walls and the electrical component. For one outer wall, no buffer block 510 is provided between it and the battery cell assembly 200; the space between the electrical component and the electrical interface 310 on that outer wall is filled by an electrical connection line. The electrical connection line can be a wire used for electrical connection. This arrangement avoids the buffer block 510 from the electrical interface 310 and the connection line between the electrical interface 310 and the electrical component, preventing sparks generated during the charging or discharging of the electrical component from igniting the buffer block 510 and causing a fire. Furthermore, since only this one outer wall lacks a buffer block 510, while the remaining outer walls are provided with outer walls, when a collision occurs between this outer wall and the battery cell assembly 200 in the opposite direction, the direction is as follows... Figure 1 In the front-back direction, the buffer block 510 on the outer side of the housing 100, located on the opposite side of one of its outer side walls, between the housing 100 and the battery cell assembly 200 can play a corresponding impact shock absorption effect. Therefore, it can ensure the impact safety of the internal battery cell assembly 200 while reducing the risk of internal fire.

[0029] In conjunction with the foregoing embodiments, the first buffer component 400 provides a first layer of buffering for the housing 100, and the second buffer component 500 provides a second layer of buffering for the battery cell assembly 200 inside the housing 100. Firstly, for the first buffer component 400, when a collision occurs, the first buffer component 400 directly reduces the impact force caused by the collision, reducing the instantaneous change in the motion state of the housing 100. Thus, with the instantaneous change in the motion state of the housing 100 reduced, the buffer block 510 in the second buffer component 500 further undergoes appropriate elastic deformation according to the change in the state of the housing 100, so as to effectively reduce the transmission of impact force to the battery cell assembly 200 and significantly improve the safety protection level. However, if only one layer of protection is used, such as only the first buffer component 400, the force generated by the impact will directly act on the cell assembly 200 through the housing 100, causing the cell assembly 200 to suffer the same impact as the housing 100, which can easily lead to damage. If only the second buffer component 500 is used, the movement state of the housing 100 changes drastically, so the impact may exceed the elastic buffering range of the buffer material, making the movement state of the cell assembly 200 basically the same as that of the housing 100, which makes it difficult to achieve a good buffering effect. The embodiment in this utility model can solve this problem well.

[0030] In one embodiment, see [reference] Figures 2 to 5 At least two alternately arranged buffer blocks 510 are provided between the inner surface of each of the remaining outer side walls and the surface of the cell assembly 200 opposite to the outer side wall. For example, each of the remaining outer side walls includes a rear side wall 130, a left side wall 140, a right side wall 150, an upper side wall 160, and a lower side wall 170. At least two buffer blocks 510 are provided between each outer side wall and the cell assembly 200. There is a gap between adjacent buffer blocks 510, which can reduce the space occupied by the buffer blocks 510 between the cell assembly 200 and the outer side wall, and at the same time allow the gas in the housing 100 to flow between the cell assembly 200 and the outer side wall without being blocked by the buffer blocks 510.

[0031] Specifically, a clearance space 180 is provided between each outer side wall (including one outer side wall and the remaining outer side walls) and the surface of the cell assembly 200. Buffer blocks 510 on the inner surfaces of the remaining outer side walls are disposed within the clearance space 180, acting as a buffer between the cell assembly 200 and the outer side wall. Specifically, when viewed perpendicularly to the outer side wall, taking the left side wall 140 as an example, when viewing the left side wall 140 along the direction Y perpendicular to the left side wall 140, the buffer block 510 coincides with a portion of the surface of the cell assembly 200, and this portion of the surface overlaps with at least one of the opposite sides of the surface of the cell assembly 200. The side has a flow interval 190. For example, the left side wall 140 has an upper edge P and a lower edge K located on opposite sides. The buffer block 510 is close to the lower edge K in the Y direction and has a flow interval 190 between it and the upper edge P. This flow interval 190 allows air to flow from the front side to the rear side of the buffer block 510, thereby realizing gas exchange. Of course, the buffer block 510 can also have a flow interval 190 between it and both the upper edge P and the lower edge K, so that the air in each clearance space 180 can exchange with each other, avoiding the safety risk caused by local overload leading to local excessive expansion of the internal air.

[0032] Based on this, the energy storage device also includes an explosion-proof valve 600, which is disposed on the rear side wall 130 and opposite to the electrical interface 310 of the front side wall 120, thus being located away from the electrical interface 310. This enables the energy storage device to have an explosion-proof venting function, preventing the internal pressure from rising rapidly and preventing the energy storage device from exploding. Combined with the structural design in the above embodiment that allows gas communication between the clearance spaces 180, all the gas inside the housing 100 can flow to the explosion-proof valve 600, thereby achieving an explosion-proof effect.

[0033] Continue reading Figures 1 to 5 The multiple outer sidewalls include multiple first sidewalls arranged around the closed sidewalls to form the closed space 110 and two second sidewalls for covering opposite ends of the closed sidewalls, for example in Figure 2In the illustrated embodiment, the front sidewall 120, rear sidewall 130, left sidewall 140, and right sidewall 150 form a square closed side as the first sidewall. The upper sidewall 160 and lower sidewall 170 cover the upper and lower parts of the closed side as the second sidewall. Both the first and second sidewalls are formed within the housing 100. The housing 100 includes a detachably fitted cover member 101 and a support plate 102. A plurality of fixing structures 103 are provided between the cover member 101 and the support plate 102. Each fixing structure 103 is respectively disposed in the clearance space 180 between the first sidewall and the battery cell assembly 200 to avoid the battery cell assembly 200 and ensure a tight connection between them. At least two buffer blocks 510 are provided in the clearance space 180 containing the fixing structures 103 and are distributed on both sides of the fixing structures 103 to form a three-point fixation, which can effectively utilize the internal space of the housing 100 and stabilize the overall structure. For example, in Figure 4 In the cubic housing 100, screw holes are provided at the four corners and the midpoints of the four side walls of the cover member 101. The support plate 102 has connecting holes at the corresponding positions. Screws pass through the screw holes and are threaded into the connecting holes, thus achieving a fixed assembly between the cover member 101 and the support plate 102. Of course, in addition to screw connections, the fixing structure 103 can also use other detachable connection methods such as snap-fit ​​connections, which are not limited here.

[0034] Furthermore, a clearance space 180 between one of its second sidewalls and the cell assembly 200 is provided with a space along the first direction (e.g., Figure 1 Arranged in the front-to-back direction and along the second direction (e.g., ... Figure 1 At least two buffer blocks 510 extending in the left-right direction are provided in the clearance space 180 between the other second sidewall and the cell assembly 200, and at least two buffer blocks 510 arranged in the second direction and extending in the first direction are provided in the clearance space 180 between the second sidewall and the cell assembly 200, wherein the first direction is perpendicular to the second direction. Figure 4 and Figure 5 Taking the embodiment shown as an example, two buffer blocks 510 arranged along a first direction are provided on the upper sidewall 160, and both buffer blocks 510 extend along a second direction. Three buffer blocks 510 arranged along the second direction are provided on the lower sidewall 170. The three buffer blocks 510 extend along the first direction and are respectively located on both sides and the middle of the lower sidewall 170. Thus, when viewed in a direction perpendicular to the upper sidewall 160 and the lower sidewall 170, the buffer blocks 510 are arranged perpendicularly to each other and have overlapping parts. Therefore, when an impact collision occurs in the vertical direction, the impact on the upper and lower sides of the cell assembly 200 can be effectively reduced. Furthermore, the staggered structure can prevent the buffer position from being too concentrated, which would reduce the buffering effect.

[0035] Specifically, in this embodiment, the two buffer blocks 510 in the clearance space 180 corresponding to the upper sidewall 160 are respectively close to the opposite ends of the upper sidewall 160 in the first direction, and the two buffer blocks 510 in the clearance space 180 corresponding to the lower sidewall 170 are respectively close to the opposite ends of the lower sidewall 170 in the second direction, so that both ends of the upper sidewall 160 and the lower sidewall 170 have a buffering function, and play a comprehensive protection role in the vertical direction.

[0036] In addition, the energy storage device also includes a display 700 connected to the battery cell assembly 200. The display 700 provides a display interface to allow users to obtain relevant information about the energy storage device. This information may include user manuals, remaining battery power display, current status, or operational information, all of which are implemented in existing technologies and will not be elaborated upon here. The display 700 is disposed between the outer wall containing the electrical interface 310 and the surface of the battery cell assembly 200, such as... Figure 2 Between the front sidewall 120 and the surface of the battery cell assembly 200, there is a display screen portion 710 exposed on the outer side of the outer sidewall, which is used to display relevant information. Therefore, the display screen portion 710 is located in the clearance space 180 without the buffer block 510, which can prevent the buffer block 510 from being ignited by sparks generated during electrical signal exchange.

[0037] In another embodiment of this utility model, see Figure 2 The first buffer assembly 400 includes a plurality of protective pads 410, with a connecting angle 104 formed between three adjacent outer sidewalls. The protective pads 410 are attached to the connecting angle and have buffer portions extending to the three corresponding outer sidewalls. The attachment method can be adhesive bonding, ultrasonic welding, screw connection, snap-fit ​​engagement, or other connection methods. Figure 1 In the embodiment shown, the housing 100 is in the shape of a cuboid and has eight connecting corners 104. Correspondingly, eight protective pads 410 are provided and are respectively provided at each connecting corner 104. This can effectively protect the connecting corners 104 of the housing 100 while ensuring that each outer side wall can be covered by the first buffer component 400, thereby improving the protective effect of the first buffer component 400 on the housing 100.

[0038] Finally, it should be noted that the above description is merely the preferred embodiment of this utility model and is not intended to limit the utility model in any way. Any person skilled in the art can make many possible changes and simple substitutions to the technical solution of this utility model using the disclosed methods and technical content without departing from the scope of the technical solution of this utility model, and these all fall within the protection scope of the technical solution of this utility model.

Claims

1. An energy storage device, characterized by, include: A housing having a plurality of outer side walls and a closed space enclosed by the plurality of outer side walls; The battery cell assembly is disposed within the enclosed space and is used to store electrical energy; An electrical connection component includes an electrical interface disposed on the housing and capable of being exposed on the outside of the housing, the electrical interface being electrically connected to the battery cell assembly; The first buffer assembly has an outer surface exposed to the outside of the housing and an inner surface forming the enclosed space on each of the multiple outer side walls. The first buffer assembly has a buffer portion made of buffer material on the outer side surface of each of the outer side walls. The second buffer assembly includes multiple buffer blocks made of buffer material, each of which is disposed within the enclosed space. The plurality of outer sidewalls include one outer sidewall containing the electrical interface and the remaining outer sidewalls not containing the electrical interface, and each of the buffer blocks is arranged between the inner surface of each of the remaining outer sidewalls (excluding the one outer sidewall) and the surface opposite to the battery cell assembly and the outer sidewall.

2. The energy storage device of claim 1, wherein, At least two alternating buffer blocks are provided between the inner surface of each of the remaining outer sidewalls and the surface of the cell assembly opposite to the outer sidewall.

3. The energy storage device of claim 2, wherein, A clearance space is provided between each of the outer sidewalls and the surface of the cell assembly, and the buffer block on the inner side of the same outer sidewall is disposed within the clearance space; When viewed in a direction perpendicular to the outer wall, the buffer block coincides with a portion of the surface of the battery cell assembly, and the portion of the surface has a flow gap with at least one edge on the opposite side of the surface of the battery cell assembly.

4. The energy storage device of claim 2, wherein, The buffer block is made of foam material.

5. The energy storage device of claim 3, wherein, The plurality of outer sidewalls include a plurality of first sidewalls arranged around a closed side to form the closed space and two second sidewalls for covering opposite ends of the closed side. The housing includes a detachable cover member and a support plate. Multiple fixing structures are provided between the cover member and the support plate. Each fixing structure is respectively provided in the clearance space between the first side wall and the battery cell assembly. At least two buffer blocks are provided in the clearance space containing the fixing structures and are distributed on both sides of the fixing structures.

6. The energy storage device of claim 5, wherein, In one case, at least two buffer blocks arranged in a first direction and extending in a second direction are provided in the clearance space between the second sidewall and the battery cell assembly; in another case, at least two buffer blocks arranged in the second direction and extending in the first direction are provided in the clearance space between the second sidewall and the battery cell assembly. The first direction is perpendicular to the second direction.

7. The energy storage device of claim 6, wherein, The two buffer blocks in the clearance space corresponding to one of the second sidewalls are respectively close to the opposite ends of one of the second sidewalls in the first direction, and the two buffer blocks in the clearance space corresponding to the other second sidewall are respectively close to the opposite ends of the other second sidewall in the second direction.

8. The energy storage device according to any one of claims 1 to 7, wherein It also includes a display connected to the battery cell assembly, the display being disposed between one of its outer sidewalls and the surface of the battery cell assembly and having a display screen portion exposed on the outer side of the outer sidewall.

9. The energy storage device according to any one of claims 1 to 7, wherein The first buffer assembly includes a plurality of protective pads, with a connecting angle formed between three adjacent outer sidewalls. The protective pads are attached to the connecting angle and have buffer portions extending to the three outer sidewalls corresponding to the connecting angle.

10. The energy storage device according to any one of claims 1 to 7, wherein The electrical interface also includes a power input interface and a power output interface arranged on one of its outer side walls.

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