Energy storage device

Abstract

The utility model discloses an energy storage device which comprises a box body, a plurality of single batteries and a connecting assembly, the box body is provided with a containing space capable of being opened and closed, the plurality of single batteries are arranged in the containing space in an array mode, the connecting assembly is arranged in the containing space, and the connecting assembly is arranged in the containing space. The connecting assembly comprises a pole piece and a driving part, the pole piece is used for electrically connecting a plurality of single batteries, the pole piece is movably arranged in the accommodating space, and when the accommodating space is opened, the driving part is used for driving the pole piece to move away from the pole column so as to break the electric connection between the adjacent single batteries. Therefore, on one hand, the maintenance difficulty of the energy storage device can be reduced, and the disassembly difficulty of the single batteries is remarkably reduced; and on the other hand, the energy storage device can be quickly powered off, potential safety hazards are eliminated, the spreading speed of thermal runaway is delayed, and the use safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage devices, in particular to an energy storage device. Background Art

[0002] In the related art, multiple single cells (lithium-ion batteries, nickel-metal hydride batteries, lead-acid batteries, etc.) are electrically connected (in series and / or in parallel) to form a battery module or battery pack. At least one battery module or battery pack constitutes an energy storage device whose output voltage meets the usage requirements, and the working status and charging and discharging status of the battery module or battery pack are monitored by a battery management system (BMS).

[0003] However, adjacent single cells are electrically connected via pole pieces, which are welded and fixed to the poles of the single cells, making it difficult to quickly disconnect multiple single cells. This makes it difficult to replace the single cells and repair and maintain the energy storage device as a whole. In addition, electric shock is likely to occur during the repair and maintenance process, posing a safety hazard. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide an energy storage device, which has low maintenance and repair difficulty, low difficulty in replacing single batteries, and high safety.

[0005] According to an embodiment of the utility model, the energy storage device includes: a box body, a single cell and a connecting assembly, the box body has an openable and closable accommodating space, there are multiple single cells, and the multiple single cells are arranged in an array in the accommodating space, the connecting assembly is arranged in the accommodating space, and the connecting assembly includes: a pole piece and a driving member, the pole piece is used to electrically connect the multiple single cells, the pole piece is movably arranged in the accommodating space, and when the accommodating space is opened, the driving member is used to drive the pole piece to move away from the pole to disconnect the electrical connection between adjacent single cells.

[0006] According to the energy storage device of the embodiment of the utility model, by providing a connection assembly, on the one hand, the difficulty of repairing and maintaining the energy storage device can be reduced, and the difficulty of disassembling the single battery can be significantly reduced; on the other hand, the energy storage device can be quickly powered off, potential safety hazards can be eliminated, the spread of thermal runaway can be slowed down, and the safety of use can be improved.

[0007] Furthermore, the box body includes: a first box body and a second box body, the first box body is detachably arranged on the second box body to open and close the accommodating space, and the connecting assembly is arranged on the first box body.

[0008] According to some embodiments of the utility model, the connecting assembly also includes: a first plate body, the pole piece is arranged on the first box body, the first plate body is connected to the first box body and is movably arranged on the first box body, the driving member is arranged on the first plate body, and is suitable for pushing the first box body away from the single battery to move the pole piece and separate the pole piece from the pole column.

[0009] In some embodiments, the connecting assembly also includes: a first plate body, the pole piece movably disposed on the first plate body, the first plate body disposed on the first box body, the driving member disposed between the first plate body and the pole piece, and suitable for pushing the pole piece away from the single cell.

[0010] According to some embodiments of the utility model, the pole piece and the driving member are located on a side of the first plate body away from the single battery, a first avoidance hole is provided on the first plate body, and the pole piece and / or the pole column are suitable for penetrating the first avoidance hole.

[0011] In some embodiments, the energy storage device further includes: a voltage collection unit, wherein the voltage collection unit is disposed in the first box and is located on a side of the first plate away from the single battery.

[0012] Furthermore, the voltage collection unit includes: a voltage collection part and a temperature collection part, the first plate is also provided with a second avoidance hole corresponding to the end cover of the single cell, the voltage collection part is penetrated by the first avoidance hole, and the temperature collection part is penetrated by the second avoidance hole.

[0013] Furthermore, the energy storage device further includes: a second plate, the second plate is located on a side of the first plate away from the single battery, and the pole piece and the driving member are located between the second plate and the first plate.

[0014] Furthermore, a limiting hole and a third avoiding hole are provided on the second plate body, wherein the limiting hole is used for limiting the temperature collecting part, and the third avoiding hole is used for avoiding the voltage collecting unit.

[0015] Furthermore, a first wiring groove and a fixing portion are provided on the inner wall of the first box body, the temperature collection portion is provided at the fixing portion, and a temperature collection harness corresponding to the temperature collection portion is provided at the first wiring groove.

[0016] Furthermore, a second wiring groove is provided on a side of the first plate body away from the single battery, and a voltage collection harness corresponding to the voltage collection unit is provided in the second wiring groove.

[0017] In some embodiments, a limiting boss is disposed in the second box body to space the single battery from the side wall of the second box body.

[0018] According to some embodiments of the present application, the driving member is constructed as an elastic member, which is arranged between the first plate and the pole piece, and when the accommodating space is closed, the elastic member is compressed, and when the accommodating space is opened, the elastic member releases elastic potential energy and disconnects the electrical connection between the pole piece and the battery cell.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 is a schematic diagram of an energy storage device according to an embodiment of the utility model;

[0022] Figure 2 is a schematic diagram of a first box according to an embodiment of the utility model;

[0023] Figure 3 is a schematic diagram of a second box according to an embodiment of the utility model;

[0024] Figure 4 is a schematic diagram of a first plate body according to an embodiment of the utility model;

[0025] Figure 5 It is a schematic diagram of a second plate body according to an embodiment of the utility model.

[0026] Reference numerals:

[0027] Energy storage device 100,

[0028] Box 10, accommodating space 101, first box 11, first wiring groove 111, fixing portion 112, second box 12, limiting boss 121,

[0029] Single cell 20,

[0030] Connecting assembly 30, pole piece 31, driving member 32, first plate body 33, first avoidance hole 331, second avoidance hole 332, second wiring groove 333, second plate body 34, limiting hole 341, third avoidance hole 342,

[0031] Temperature collecting unit 41. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0033] Reference below Figure 1-Figure 5 An energy storage device 100 according to an embodiment of the present invention is described.

[0034] like Figure 1 As shown, the energy storage device 100 according to the embodiment of the utility model includes: a box body 10, a single cell 20 and a connecting component 30. The box body 10 can define a containing space 101, and the single cell 20 can be arranged in the containing space 101, and adjacent single cells 20 can be electrically connected (such as: in series or in parallel) through the connecting component 30 to obtain a complete energy storage device 100 that can output electrical energy according to a predetermined output voltage.

[0035] Specifically, see Figure 1 , Figure 2 and Figure 3 As shown, the box body 10 has an openable and closable accommodating space 101, there are multiple single cells 20, and the multiple single cells 20 are arranged in an array in the accommodating space 101. The connecting component 30 is arranged in the accommodating space 101, and the connecting component 30 includes: a pole piece 31 and a driving member 32. The pole piece 31 is used to electrically connect the multiple single cells 20. The pole piece 31 is movably arranged in the accommodating space 101. When the accommodating space 101 is opened, the driving member 32 is used to drive the pole piece 31 to move away from the pole to disconnect the electrical connection between adjacent single cells 20.

[0036] In which, when the accommodating space 101 is in a closed state, the pole piece 31 contacts the pole of the single cell 20 to electrically connect the adjacent single cells 20. When the accommodating space 101 is in an open state, the driving member 32 is suitable for driving the pole piece 31 to move away from the pole to disconnect the electrical connection between the adjacent single cells 20.

[0037] Specifically, the single cells 20 are arranged in an array, that is, they are arranged in rows in a first direction and in columns in a second direction, and the first direction is different from the second direction, so that multiple single cells 20 can be arranged in the accommodating space 101. The connecting component 30 includes at least a pole piece 31 and a driving member 32. The driving member 32 can drive the pole piece 31 to move away from the pole to ensure that the electrical connection between adjacent single cells 20 can be disconnected when the box body 10 is opened.

[0038] It should be pointed out that the movement of the pole piece 31 away from the pole should be understood as relative movement. The driving member 32 can be used to drive the pole piece 31 to move away from the pole, or the driving member 32 can drive the pole to move away from the pole piece 31, or the pole piece 31 and the pole can move away from each other synchronously. There is relative movement between the two, so as to move away from each other, and no specific limitation is made here.

[0039] It can be understood that when the box body 10 is in a closed state, the connection assembly 30 can realize the electrical connection of multiple single cells 20, and there is no need to realize the electrical connection between adjacent poles through laser welding or the like, which can reduce the maintenance difficulty of the energy storage device 100, especially significantly reduce the difficulty of replacing the single cells 20. There are functional differences (such as SOC differences) between the single cells 20 in the energy storage device 100, and the replacement of the single cells 20 can be realized simply and quickly. At the same time, after the box body 10 is switched to the open state, the electrical connection between adjacent single cells 20 can be cut off synchronously, so that when the energy storage device 100 is repaired and maintained, it can be ensured that the energy storage device 100 is in a power-off condition to avoid electric shock, eliminate safety hazards, and improve safety. At the same time, when the energy storage device 100 has thermal runaway, it can also achieve rapid power off to avoid thermal runaway caused by short circuit of the single cell 20, so as to slow down the spread of thermal runaway.

[0040] According to the energy storage device 100 of the embodiment of the utility model, by providing the connection assembly 30, on the one hand, the difficulty of repairing and maintaining the energy storage device 100 can be reduced, and the difficulty of disassembling the single battery 20 can be significantly reduced; on the other hand, the energy storage device 100 can be quickly powered off, safety hazards can be eliminated, the spread of thermal runaway can be slowed down, and the safety of use can be improved.

[0041] It should be pointed out that the driving member 32 can be a driving structure that enables an elastic member or the like to achieve circuit breaking through elastic potential energy, or can be a driving structure in other mechanical forms, and the present invention does not impose any specific limitation thereto.

[0042] like Figure 2 and Figure 3 As shown, further, the box body 10 includes: a first box body 11 and a second box body 12 , the first box body 11 is detachably disposed in the second box body 12 to open and close the accommodating space 101 , and the connecting assembly 30 is disposed in the first box body 11 .

[0043] Specifically, the first box body 11 is configured to be flippable, pullable or detachably arranged on the second box body 12, and the connecting component 30 is arranged on the first box body 11. When the first box body 11 moves away from the second box body 12, the connecting component 30 can be configured to instantly disconnect the adjacent single cells 20 to achieve the technical effect of rapid and timely disconnection, thereby improving the reliability and safety of the energy storage device 100.

[0044] like Figure 1 and Figure 4 As shown, in some embodiments, the connecting assembly 30 also includes: a first plate 33 and a pole piece 31 are arranged on the first box 11 and are located on the surface of the first box 11 opposite to the pole, the first plate 33 is connected to the first box 11 and is movably arranged on the first box 11, and the driving member 32 is arranged on the first plate 33 and is suitable for pushing the first box 11 away from the battery cell 20 to separate the pole piece 31 from the pole; or in other embodiments, the connecting assembly 30 also includes: the first plate 33 and the pole piece 31 are movably arranged on the first plate 33, the first plate 33 is arranged on the first box 11, the driving member 32 is arranged between the first plate 33 and the pole piece 31, and is suitable for pushing the pole piece 31 away from the single battery 20 to separate the pole piece 31 from the pole.

[0045] That is to say, in some embodiments, the first plate 33 is fixed on the first box body 11, and its position relative to the pole remains unchanged, and the driving member 32 is used to drive the pole piece 31 to move, so that the pole piece 31 moves away from the pole to achieve rapid circuit breaking. In other embodiments, the pole piece 31 is fixed on the first box body 11, and the first plate 33 is movably arranged on the first box body 11. When the first box body 11 moves away from the single battery 20, the pole piece 31 fixed on the first box body 11 is moved away from the pole, and the pole piece 31 is disengaged from the pole.

[0046] Therefore, by setting a first plate body 33 with a movable connection and making the driving member 32 drive the first plate body 33 to move, or by setting a pole piece 31 with a movable connection and making the driving member 32 drive the pole piece 31 to move, the technical effect of rapid circuit breaking can be achieved. Those skilled in the art can make reasonable settings according to actual needs, and the utility model does not impose specific restrictions.

[0047] It should be pointed out that, in an embodiment of the first plate body 33, the pole piece 31 can be movably arranged, a guide column can be arranged on the first plate body 33, and the pole piece 31 can be slidably arranged in the guide column, the driving member 32 can be constructed as a linear spring and arranged in the guide column, and the first plate body 33 can be movably arranged in an embodiment of the first box body 11, a mounting pin can be arranged on the first box body 11, one end of the mounting pin is connected to the first box body 11, and a limiting ball is arranged on the other end, the first plate body 33 can be movably arranged on the mounting pin, and the limiting ball is used to prevent the first plate body 33 from detaching from the first box body 11, and a linear spring can also be arranged on the mounting pin to realize elastic drive.

[0048] It should be noted that, in some embodiments, the first box body 11 is a box cover, the second box body 12 is a lower box, and the box cover is arranged above the lower box.

[0049] like Figure 1 and Figure 4 As shown, according to some embodiments of the present invention, the pole piece 31 and the driving member 32 are located on the side of the first plate 33 away from the single battery 20, and a first avoidance hole 331 is provided on the first plate 33, and the pole piece 31 and / or the pole are suitable for penetrating the first avoidance hole 331.

[0050] Specifically, the pole piece 31 can be constructed as a U-shaped connecting piece, and the open end forms a first connecting part and a second connecting part, the first connecting part can be selectively electrically connected to the pole of one battery, and the second connecting part can be selectively electrically connected to the pole of another battery, and a plurality of groups of avoidance holes are formed on the first plate body 33, each group of avoidance holes is respectively arranged corresponding to a first connecting part and a second connecting part, and the shape of the avoidance hole is consistent with the shape of the first connecting part, the second connecting part or the pole, so as to ensure that the pole and / or the first connecting part, the second connecting part can pass through the first avoidance hole 331, so as to ensure that when the box body 10 is in a closed state, the electrical connection inside the energy storage device 100 is more stable and reliable, to avoid poor contact, to avoid local overheating, and to improve the safety of the energy storage device 100.

[0051] like Figure 1 and Figure 2 As shown, in some embodiments, the energy storage device 100 further includes: a voltage collection unit, which is disposed in the first box body 11 and located on a side of the first plate body 33 away from the single battery 20 .

[0052] Specifically, the voltage collection unit includes: a voltage collection part and a temperature collection part 41. The first plate 33 is provided with a first avoidance hole 331 corresponding to the pole and a second avoidance hole 332 corresponding to the end cover of the single battery 20. The voltage collection part is penetrated by the first avoidance hole 331, and the temperature collection part 41 is penetrated by the second avoidance hole 332.

[0053] Specifically, the temperature collection part 41 is used to collect the end cover temperature of the single cell 20, and the voltage collection part is used to be electrically connected to the pole with the same potential to collect voltage. The first avoidance hole 331 can be used to avoid the pole while also avoiding the voltage collection part, so as to reduce the difficulty of arranging the voltage collection part and ensure that the voltage information collected by the voltage collection part is accurate and reliable. The second avoidance hole 332 is formed between each group of the first avoidance holes 331. The temperature collection part 41 is penetrated by the second avoidance hole 332 to collect the temperature of the single cell 20, which can also reduce the difficulty of arranging the temperature collection part 41 and improve the temperature collection accuracy of the temperature collection part 41.

[0054] It should be pointed out that the temperature collection part 41 has a corresponding temperature collection harness, the voltage collection part has a voltage collection harness, and a harness through hole can be set on the second box body 12 to facilitate the arrangement of the temperature collection harness and the voltage collection harness, and the second box body 12 can also form an output terminal, a cooling medium inlet and outlet, an inspection window, etc. The single battery 20 is provided with a pole and a side plate of the pressure relief valve is defined as the end plate of the battery single cell 20, and the temperature collection part 41 is penetrated by a first avoidance hole 331 to facilitate the collection of the end plate temperature, and the second avoidance hole 332 is penetrated by a second avoidance hole 332 to facilitate the collection of the battery single cell 20 voltage.

[0055] like Figure 5 As shown, the energy storage device 100 further includes: a second plate 34 , which is located on a side of the first plate 33 away from the single battery 20 , and the pole piece 31 and the driving member 32 are located between the second plate 34 and the first plate 33 .

[0056] Specifically, the second plate 34 is arranged opposite to the first plate 33, and the driving member 32 and the pole piece 31 are arranged between the first plate 33 and the second plate 34, which can avoid the movement of the driving member 32 and the pole piece 31, thereby reducing the difficulty of assembly and ensuring the stability and reliability of the connecting component 30.

[0057] The driving member 32 can be constructed as a driving rod, which can be driven by air pressure, hydraulic pressure or electricity to drive the first plate body 33 to move relative to the second plate body 34. The driving member 32 can also be constructed as an elastic member to release elastic potential energy to drive the first plate body 33 or the pole piece 31 to achieve a circuit-breaking action.

[0058] See also Figure 5 As shown, further, a limiting hole 341 and a third avoiding hole 342 are provided on the second plate body 34. The limiting hole 341 is used to limit the temperature collection part 41, and the third avoiding hole 342 is used to avoid the voltage collection unit.

[0059] Therefore, by setting the limiting hole 341, the temperature collection part 41 can be limited to prevent the temperature collection part 41 from moving, so as to ensure that the temperature collection part 41 can be pushed against the temperature detection area of ​​the single battery 20, thereby improving the detection accuracy and detection effect, and the third avoidance hole 342 is used to avoid the voltage collection unit, so that the collection terminal of the voltage collection unit can be directly opposite to the pole or pole piece 31, so as to improve the collection accuracy of the voltage collection unit.

[0060] like Figure 3 and Figure 5As shown, further, a first wiring groove 111 and a fixing portion 112 are provided on the inner wall of the first box body 11, the temperature collection portion 41 is provided on the fixing portion 112, and the temperature collection harness corresponding to the temperature collection portion 41 is provided in the first wiring groove 111; a second wiring groove 333 is also provided on the side of the first plate body 33 away from the single battery 20, and the voltage collection harness corresponding to the voltage collection portion is provided in the second wiring groove 333.

[0061] As a result, the temperature collection harness and the voltage collection harness are separated, which reduces the difficulty of wiring and makes the wiring neat and clear, while avoiding interference between the temperature collection harness and the voltage collection harness, so as to improve the accuracy and reliability of voltage and temperature collection.

[0062] like Figure 3 As shown, in some embodiments, a limiting boss 121 is disposed in the second box body 12 to space the single battery 20 from the side wall of the second box body 12 .

[0063] Thus, the reliability of the arrangement of the single battery 20 in the second box body 12 can be improved, and an expansion gap can be formed between the box body 10 and the single battery 20 to form a buffer space, which effectively absorbs the thermal expansion of the single battery 20 and improves the stability and safety of the energy storage device 100.

[0064] Exemplarily, the driving member 32 of the embodiment of the present application can be constructed as an elastic member, such as a spring, a spring, etc. The elastic member is arranged between the first plate 33 and the pole piece 31, and when the accommodating space is closed, the first box body 11 is connected to the second box body 12. At this time, the elastic member is compressed, and the pole piece 31 contacts the pole of the battery cell 20 to realize the electrical connection between adjacent battery cells 20. When the accommodating space is opened, the elastic member releases elastic potential energy, and the elastic potential energy can push the first box body 11 to open quickly, and can disconnect the electrical connection between the pole piece 31 and the battery cell 20.

[0065] In this way, the energy storage device 100 can be quickly powered off, potential safety hazards can be eliminated, the spread of thermal runaway can be slowed down, and the safety of use can be improved.

[0066] It should be pointed out that the energy storage device 100 in the embodiment of the present invention can be used as a power supply energy device for electrical equipment such as vehicles, and can also be formed into an energy storage device 100 with other uses.

[0067] It is understandable that since the energy people need is highly temporal and spatial, in order to rationally use energy and improve energy utilization, it is necessary to use a medium or device to store one form of energy in the same form or convert it into another form of energy, and then release it in a specific form of energy based on future application needs. As we all know, to achieve the goal of carbon neutrality, green energy is currently mainly used to replace fossil energy to achieve the purpose of generating green electricity.

[0068] The current green energy mainly includes solar energy, wind energy, hydropower, etc. However, solar energy and wind energy generally have problems of strong intermittency and large volatility, which will cause unstable voltage of the green power grid (not enough electricity during peak hours and too much electricity during low hours). Unstable voltage will cause damage to electricity. Therefore, it may cause the problem of "wind and solar power abandonment" due to insufficient electricity demand or insufficient grid acceptance capacity.

[0069] To solve the problem of insufficient electricity demand or insufficient grid acceptance capacity, it is necessary to rely on the energy storage device 100. That is, the energy storage device 100 converts electrical energy into other forms of energy through physical or chemical means and stores it, and then converts the energy stored in the energy storage device 100 into electrical energy when needed. In simple terms, the energy storage device 100 is similar to a large "power bank", which stores electrical energy when there is sufficient light energy and wind energy, and releases the stored electrical energy when needed.

[0070] At present, energy storage (i.e., energy storage) has a wide range of application scenarios, including power generation side energy storage, grid side energy storage, renewable energy grid-connected energy storage, and user side energy storage. The corresponding types of energy storage devices 100 include:

[0071] (1) Large energy storage containers used in grid-side energy storage scenarios can serve as high-quality active and reactive power regulation power sources in the grid, achieve load matching of electric energy in time and space, enhance the ability to absorb renewable energy, and are of great significance in grid system backup, relieving peak load power supply pressure, and peak and frequency regulation;

[0072] (2) Small and medium-sized energy storage cabinets used in industrial and commercial energy storage scenarios (banks, shopping malls, etc.) on the user side and small household energy storage boxes used in home energy storage scenarios on the user side mainly operate in the "peak shaving and valley filling" mode. Since there is a large price difference in electricity charges at peak and valley locations according to electricity demand, after users have energy storage equipment, in order to reduce costs, they usually charge the energy storage cabinets / boxes during the low electricity price period; during the peak electricity price period, the electricity in the energy storage equipment is discharged for use, so as to save electricity bills. In addition, in remote areas, as well as areas prone to natural disasters such as earthquakes and hurricanes, the presence of the household energy storage device 100 is equivalent to the user providing a backup power supply for himself and the power grid, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0073] In combination with the above-mentioned situation of storing energy by physical or electrochemical means, taking electrochemical energy storage as an example, the energy storage device 100 may include at least one group of chemical batteries, using the chemical elements in the chemical batteries as energy storage media, so as to realize the charging and discharging process through the chemical reaction or change of the energy storage medium. In simple terms, the electric energy generated by light energy and wind energy is stored in at least one group of chemical batteries through the chemical reaction or change of the energy storage medium, and when the use of external electric energy reaches a peak, the electric energy stored in at least one group of chemical batteries is released for use through the chemical reaction or change of the energy storage medium, or transferred to a place where the electric energy is scarce for use.

[0074] Other structures and operations of the energy storage device 100 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0075] In the description of the present invention, it should be understood that 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" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0076] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0077] In the description of the present invention, "plurality" means two or more.

[0078] In the description of the present invention, a first feature being “above” or “below” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact but are in contact with each other via another feature therebetween.

[0079] In the description of the present invention, a first feature “above”, “over” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0080] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0081] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An energy storage device, characterized in that: include: A box body (10), wherein the box body (10) has an openable and closable accommodating space (101); Single cells (20), the single cells (20) being multiple, and the multiple single cells (20) being arranged in an array in the accommodating space (101); A connecting assembly (30), the connecting assembly (30) being arranged in the accommodating space (101), the connecting assembly (30) comprising: a pole piece (31) and a driving member (32), the pole piece (31) being used to electrically connect a plurality of the single cells (20), the pole piece (31) being movably arranged in the accommodating space (101), and the driving member (32) being used to drive the pole piece (31) to move away from the pole post so as to disconnect the electrical connection between adjacent single cells (20) when the accommodating space (101) is opened.

2. The energy storage device according to claim 1, characterized in that: The box (10) comprises: a first box (11) and a second box (12); the first box (11) is detachably arranged on the second box (12) to open and close the accommodating space (101); and the connecting assembly (30) is arranged on the first box (11).

3. The energy storage device according to claim 2, characterized in that: The connecting assembly (30) further comprises: a first plate (33), the pole piece (31) being arranged on the first box (11), the first plate (33) being connected to the first box (11) and being movably arranged on the first box (11), the driving member (32) being arranged on the first plate (33) and being suitable for pushing the first box (11) to move away from the single battery (20) so as to separate the pole piece (31) from the pole column.

4. The energy storage device according to claim 2, characterized in that: The connecting assembly (30) further comprises: a first plate (33), the pole piece (31) being movably arranged on the first plate (33), the first plate (33) being arranged on the first box (11), the driving member (32) being arranged between the first plate (33) and the pole piece (31), and being suitable for pushing the pole piece (31) to move away from the single battery (20).

5. The energy storage device according to claim 3 or 4, characterized in that: The pole piece (31) and the driving member (32) are located on a side of the first plate (33) away from the single battery (20); a first avoidance hole (331) is provided on the first plate (33); and the pole piece (31) and / or the pole column are suitable for penetrating the first avoidance hole (331).

6. The energy storage device according to claim 5, characterized in that: The energy storage device further comprises: a voltage collection unit, which is arranged in the first box (11) and located on a side of the first plate (33) away from the single battery (20).

7. The energy storage device according to claim 6, characterized in that: The voltage collection unit comprises: a voltage collection part and a temperature collection part (41); the first plate (33) is also provided with a second avoidance hole (332) corresponding to the end cover of the single cell; the voltage collection part is provided with the first avoidance hole (331); and the temperature collection part (41) is provided with the second avoidance hole (332).

8. The energy storage device according to claim 7, characterized in that: Also includes: A second plate body (34), the second plate body (34) is located on a side of the first plate body (33) away from the single battery (20), and the pole piece (31) and the driving member (32) are located between the second plate body (34) and the first plate body (33).

9. The energy storage device according to claim 8, characterized in that: The second plate body (34) is provided with a limiting hole (341) and a third avoiding hole (342), wherein the limiting hole (341) is used to limit the temperature collection part (41), and the third avoiding hole (342) is used to avoid the voltage collection unit.

10. The energy storage device according to claim 7, characterized in that: A first wiring groove (111) and a fixing portion (112) are provided on the inner wall of the first box body (11); the temperature collection portion (41) is provided on the fixing portion (112); and a temperature collection harness corresponding to the temperature collection portion (41) is provided on the first wiring groove (111).

11. The energy storage device according to claim 7, characterized in that: A second wiring groove (333) is also provided on the side of the first plate (33) facing away from the single battery (20), and a voltage collection harness corresponding to the voltage collection unit is provided in the second wiring groove (333).

12. The energy storage device according to claim 2, characterized in that: A limiting boss (121) is provided in the second box body (12) so as to space the single battery (20) from the side wall of the second box body (12).

13. The energy storage device according to claim 1, characterized in that: The driving member (32) is constructed as an elastic member, which is arranged between the first plate (33) and the pole piece (31). When the accommodating space is closed, the elastic member is compressed, and the pole piece (31) is electrically connected to the single battery (20). When the accommodating space is opened, the elastic member releases elastic potential energy and disconnects the electrical connection between the pole piece (31) and the single battery (20).

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