Energy storage device

Abstract

An energy storage device (100), comprising battery packs (10) and a waterproof plug (20). Each battery pack (10) comprises a housing (11) formed with an opening (111) and a connection terminal (12) provided at the opening (111), wherein the connection terminal (12) comprises a first connection portion (121). The waterproof plug (20) comprises a second connection portion (21). The waterproof plug (20) is connected to the connection terminal (12) by fitting the first connection portion (121) to the second connection portion (21), and seals the opening (111).

Description

Energy storage device

[0001] Priority information

[0002] This application claims priority to and the benefit of the filing date of Chinese Patent Application No. 202410482331.7, filed April 19, 2024, and Chinese Patent Application No. 202410482398.0, filed April 19, 2024, and incorporates by reference the entire contents of each of the foregoing applications. TECHNICAL FIELD

[0003] The present application relates to the technical field of energy storage, and more particularly, to an energy storage device. BACKGROUND

[0004] An energy storage device generally includes a plurality of battery packs arranged in a stack. The bottom of the shell of each battery pack is usually formed with an opening and is provided with a connection terminal at the opening. When assembled, each battery pack is connected to the battery pack below through the connection terminal, and at the same time, the battery pack below seals the opening of the battery pack above. However, the battery pack at the bottom cannot be sealed due to the absence of a battery pack below. Therefore, the energy storage device of the related art is provided with a base below the battery pack at the bottom to seal the opening of the battery pack at the bottom, so that the energy storage device becomes bulky and is inconvenient to move. SUMMARY

[0005] The present application provides an energy storage device.

[0006] The energy storage device of the present application includes:

[0007] a battery pack including a shell and a connection terminal, the shell being formed with an opening, the connection terminal being provided at the opening, the connection terminal including a first connecting portion; and

[0008] a waterproof plug including a second connecting portion, the waterproof plug being configured to be connected to the connection terminal through cooperation of the first connecting portion and the second connecting portion and to seal the opening.

[0009] The energy storage device of the present application achieves the connection of the waterproof plug and the terminal through cooperation of the first connecting portion and the second connecting portion, and seals the opening to achieve waterproofing at the opening. At the same time, compared with the base, the waterproof plug has a small volume and is convenient to move, which is conducive to improving the portability of the energy storage device. In addition, the waterproof plug has a small volume and a simple structure, which is conducive to reducing the production cost of the energy storage device.

[0010] In some embodiments, the waterproof plug further comprises an electrical connector configured to be plugged into the connection terminal to electrically connect with the connection terminal to form a first signal.

[0011] In some embodiments, the first signal is used to determine that the battery pack is located at the bottom.

[0012] In some embodiments, the battery pack comprises a short circuit detection module, and the electrical connector is used to short circuit the connection terminal to make the short circuit detection module detect the first signal.

[0013] In some embodiments, the connection terminal comprises a first detection pin and a second detection pin, the first detection pin and the second detection pin are connected with a short circuit detection module, the first detection pin is connected with a ground terminal, and a first resistor is arranged between the first detection pin and the ground terminal.

[0014] In some embodiments, the connection terminal comprises a first detection pin and a second detection pin, the first detection pin is connected with a short circuit detection module and a ground terminal respectively, a second resistor is arranged between the first detection pin and the ground terminal, and the second detection pin is connected with a power supply terminal.

[0015] In some embodiments, the connection terminal comprises a first detection pin and a second detection pin, the first detection pin is connected with a short circuit detection module and a power supply terminal respectively, a third resistor is arranged between the first detection pin and the power supply terminal, and the second detection pin is connected with a ground terminal.

[0016] In some embodiments, the connection terminal comprises a first detection pin and a second detection pin, the first detection pin is connected with a power supply terminal, and the second detection pin is connected with a ground terminal through a fourth resistor, the electrical connector comprises a fourth detection pin and a fifth detection pin, the fourth detection pin is connected with the fifth detection pin through a fifth resistor, when the waterproof plug seals the opening, the fourth detection pin is electrically connected with the first detection pin, the fifth detection pin is electrically connected with the second detection pin, and the short circuit detection module detects the first signal by detecting the level of the fifth detection pin.

[0017] In some embodiments, the energy storage device comprises a water immersion detection module and a water immersion detection element, the water immersion detection module is electrically connected with the water immersion detection element, and when the waterproof plug seals the opening and the waterproof plug is immersed in water, the water immersion detection module is configured to detect a second signal emitted by the water immersion detection element to determine that the waterproof plug is immersed in water.

[0018] In some embodiments, the water immersion detection module is configured to control the electrical connector to emit a water immersion alarm signal when the second signal is detected.

[0019] In some embodiments, the water immersion detection module and the water immersion detection piece are arranged in the waterproof plug.

[0020] In some embodiments, the connection terminal comprises a first detection pin, a second detection pin and a third detection pin, the first detection pin is connected to a power supply end, the second detection pin is connected to a ground end through a fourth resistor, and the third detection pin is connected to the ground end; the electric connection piece comprises a fourth detection pin, a fifth detection pin and a sixth detection pin; when the waterproof plug seals the opening, the fourth detection pin is electrically connected to the first detection pin as a power supply end of the water immersion detection module, the sixth detection pin is electrically connected to the third detection pin as a ground end of the water immersion detection module, and the fifth detection pin is electrically connected to the second detection pin, and the fifth detection pin is configured to receive a control instruction of the water immersion detection module to send a water immersion alarm signal.

[0021] In some embodiments, the water immersion detection piece is arranged on a sealing bottom plate of the waterproof plug, and the water immersion detection piece comprises two conductive wires, which are arranged on a surface of the sealing bottom plate away from the battery pack.

[0022] In some embodiments, the battery pack comprises an identification unit, which is configured to determine that the battery pack is in an unshort-circuited state when the second detection pin is detected to have a third signal.

[0023] In some embodiments, the connection terminal comprises a first guide part, and the waterproof plug comprises a second guide part, the waterproof plug is configured to be inserted into the connection terminal through cooperation of the first guide part and the second guide part to ensure that the electric connection piece is aligned.

[0024] In some embodiments, the connection terminal comprises a terminal part in a columnar shape, the first guide part comprises an outer column surface of the terminal part, and the second guide part comprises a guide sleeve extending upward from the sealing bottom plate and cooperating with the outer column surface.

[0025] In some embodiments, the first guide part further comprises a guide hole formed in an end surface of the terminal part, the second guide part comprises a guide column extending upward from the sealing bottom plate and cooperating with the guide hole, and a height of the guide column is greater than a height of the guide sleeve.

[0026] In some embodiments, a rounded corner is formed at a connection between the outer column surface and the end surface of the terminal part.

[0027] In some embodiments, the waterproof plug comprises a sealing bottom plate, the second connection part is formed on the sealing bottom plate, the second connection part extends into the opening to cooperate with the first connection part, and the sealing bottom plate seals the opening outside the shell.

[0028] In some embodiments, the sealing bottom plate is in a runway shape, and two ends of the sealing bottom plate in the length direction are curved outwards away from the shell to form curved edges.

[0029] In some embodiments, the connecting terminal comprises a terminal base comprising a first connecting cylinder; the waterproof plug comprises a second connecting cylinder extending upwards from the sealing bottom plate through the opening and matched with the first connecting cylinder; the first connecting part comprises an inner wall of the first connecting cylinder, and the second connecting part comprises an elastic member sleeved on the second connecting cylinder; the waterproof plug is connected with the connecting terminal through interference fit of the elastic member and the first connecting cylinder.

[0030] In some embodiments, the elastic member comprises a plurality of reverse buckle rings arranged along the axial direction of the second connecting cylinder.

[0031] In some embodiments, the elastic member comprises a sealing gasket located on the sealing bottom plate, and the sealing gasket is located between the shell and the sealing bottom plate.

[0032] In some embodiments, the battery pack comprises a plurality of battery packs, and the battery packs are stacked, each of the battery packs is connected with the battery pack below through the connecting terminal, and the bottom battery pack is connected with the waterproof plug.

[0033] Additional aspects and advantages of the embodiments disclosed herein will be set forth in part in the description that follows, and in part will become apparent to those skilled in the art upon examination of the following description and drawings or can be learned by practice of the embodiments disclosed herein. BRIEF DESCRIPTION OF DRAWINGS

[0034] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the drawings, in which:

[0035] FIG. 1 is a perspective view of an energy storage device according to an embodiment of the present application;

[0036] FIG. 2 is a partial perspective view of the energy storage device according to an embodiment of the present application from another perspective;

[0037] FIG. 3 is a partial exploded view of the energy storage device according to an embodiment of the present application;

[0038] FIG. 4 is a partial cross-sectional view of the energy storage device according to an embodiment of the present application;

[0039] FIG. 5 is an enlarged view of portion V of the energy storage device of FIG. 4;

[0040] FIG. 6 is a perspective view of a waterproof plug of the energy storage device according to an embodiment of the present application;

[0041] Fig. 7 is a perspective view of a connection terminal of a battery pack of an energy storage device according to an embodiment of the present application;

[0042] Fig. 8 is a plan view of a connection terminal according to an embodiment of the present application;

[0043] Fig. 9 is a perspective view of an electrical connector of a waterproof plug according to an embodiment of the present application;

[0044] Fig. 10 is a schematic view of a short circuit detection circuit according to an embodiment of the present application;

[0045] Fig. 11 is a schematic view of a short circuit detection circuit according to another embodiment of the present application;

[0046] Fig. 12 is a schematic view of a short circuit detection circuit according to still another embodiment of the present application;

[0047] Fig. 13 is a schematic view of a short circuit detection and water immersion detection circuit according to an embodiment of the present application;

[0048] Fig. 14 is a schematic view of a module of an energy storage device according to an embodiment of the present application;

[0049] Fig. 15 is a schematic view of a short circuit detection and water immersion detection circuit according to another embodiment of the present application;

[0050] Fig. 16 is a front view of a waterproof plug of an energy storage device according to an embodiment of the present application. DETAILED DESCRIPTION

[0051] Embodiments of the present application are described in detail below with reference to the attached drawings, wherein like or similar elements are denoted by the same or similar reference numerals throughout the drawings. The embodiments described below are examples of the present application, which are only used to explain the present application, and should not be understood as limiting the present application. In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore should not be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be understood as limiting the present application. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0052] In the description of the present application, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected. It can be mechanical connection, or electrical connection. It can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0053] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "under" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0054] The disclosure herein provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and arrangements of specific examples are described herein. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to numbers and / or letters in different examples. Such repetition is for the purpose of simplification and clarity, and in itself does not indicate a relationship between the various embodiments and / or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0055] The energy storage device generally includes a plurality of battery packs arranged in a stack. The bottom of the housing of each battery pack is usually formed with an opening and provided with a connection terminal at the opening. When assembled, each battery pack is connected to the battery pack below through the connection terminal, and at the same time, the battery pack below seals the opening of the battery pack above. However, the bottom battery pack cannot be sealed because there is no battery pack below. Therefore, the energy storage device of the related art seals the opening of the bottom battery pack by providing a base under the bottom battery pack, so that the energy storage device becomes bulky and inconvenient to move.

[0056] In some embodiments, as shown in FIG. 1, the energy storage device 100 provided by the present application can be a balcony photovoltaic energy storage device. The balcony photovoltaic energy storage device is relatively small and easy to move, and can be transferred to a new location according to the user's electricity demand, for example, from the balcony to the garage or even outdoors.

[0057] Referring to FIGS. 1-4, the embodiments of the present application provide an energy storage device 100, which comprises a battery pack 10 and a waterproof plug 20. The battery pack 10 comprises a shell 11 and a connecting terminal 12. The shell 11 is formed with an opening 111. The connecting terminal 12 is arranged at the opening 111. The connecting terminal 12 comprises a first connecting portion 121, the waterproof plug 20 comprises a second connecting portion 21, and the waterproof plug 20 is configured to be connected with the connecting terminal 12 by the cooperation of the first connecting portion 121 and the second connecting portion 21 and seal the opening 111.

[0058] The waterproof plug 20 proposed by the embodiments of the present application realizes the connection of the waterproof plug 20 with the terminal through the cooperation of the first connecting portion 121 and the second connecting portion 21, and seals the opening 111 to realize waterproof at the opening 111. Compared with the base, the waterproof plug 20 is small in size, which is conducive to improving the portability of the energy storage device 100. In addition, since the waterproof plug 20 is small in size and simple in structure, it is conducive to reducing the production cost of the energy storage device 100.

[0059] Specifically, the energy storage device 100 refers to a device that can store electrical energy or other forms of energy and release it to supply the power system or other devices when needed. In the embodiments of the present application, the energy storage device 100 refers to a portable energy storage device 100 for household use, which generally comprises a functional module and a plurality of battery packs 10. The plurality of battery packs 10 are stacked, wherein the plurality of battery packs 10 can specifically include an energy storage all-in-one machine and at least one power pack. The energy storage all-in-one machine mainly includes an inverter and a battery module inside, and the power pack mainly includes a battery module. As shown in FIG. 1, after the energy storage all-in-one machine and the at least one power pack are stacked and connected through respective connecting terminals 12, conduction and signal transmission can be realized between the energy storage all-in-one machine and the power pack, thereby realizing the capacity expansion of the battery of the energy storage device 100.

[0060] The functional module is responsible for monitoring, managing and controlling the battery state, current, voltage and other parameters of the battery pack 10. Further, by introducing advanced technologies such as artificial intelligence and big data, the operation strategy of the energy storage device 100 can be optimized, and the energy utilization efficiency and the stability of the system can be improved.

[0061] The battery pack 10 is the core part of the energy storage device 100, which is responsible for the storage and release of electrical energy. In order to improve the storage capacity, the number of battery packs 10 is generally multiple, and each battery pack 10 comprises a battery management system (BMS) and other components.

[0062] Referring to FIG. 1 and FIG. 2, the shell 11 of the battery pack 10 is an injection molded plastic shell, the shell 11 is provided with a handle 112 on both sides along the height direction for carrying and moving the battery pack 10, and the shell 11 is provided with a support foot 113 at the bottom for supporting the shell 11, when the battery pack 10 is used alone, the support foot 113 can be used to elevate the battery pack 10, thereby achieving a certain waterproof effect. Correspondingly, the top of the shell 11 is provided with a receiving groove 114 for accommodating the support foot 113, when multiple battery packs 10 are stacked together, the support foot 113 can be placed in the receiving groove 114, so that the contact area of the shells 11 of adjacent battery packs 10 is larger, thereby dispersing the pressure and making the stack more secure. In addition, since the opening 111 is usually provided at the bottom, the close fit of the shell 11 can also achieve sealing at the opening 111. The shell 11 is thus arranged to connect multiple battery packs 10 in the form of building blocks, which facilitates users to reduce or expand the number of battery packs 10 according to their needs.

[0063] In other embodiments, the opening 111 can also be provided on the side of the battery pack 10. It is easy to understand that at this time the battery pack 10 should be arranged side by side in the length or width direction.

[0064] Since the opening 111 is usually provided at the bottom, the connection terminal 12 is usually located at the bottom of the battery pack 10, and correspondingly, the top of the battery pack 10 is provided with a connection plug 13. When two battery packs 10 are stacked on each other, the connection plug 13 of the battery pack 10 at the bottom will be inserted into the opening 111 of the battery pack 10 at the top and electrically connected with the connection terminal 12, thereby realizing communication between the two battery packs 10.

[0065] In other embodiments, the connection terminal 12 can also be provided at the top of the battery pack 10, and the connection plug 13 can be provided at the bottom of the battery pack 10. At this time, the waterproof plug 20 is used to connect and seal the connection plug 13.

[0066] Referring to FIG. 6, in some embodiments, the waterproof plug 20 further includes an electrical connection piece 25, which is configured to be inserted into the connection terminal 12 to electrically connect with the connection terminal 12 to form a first signal.

[0067] In this way, the waterproof plug 20 realizes one object with two functions.

[0068] Referring to FIG. 6 and FIG. 9, specifically, in some embodiments, the electrical connection piece 25 can include two metal probes 251, one end of the two metal probes 251 is used to be inserted into the connection terminal 12, and the other end is electrically connected, further, the electrical connection piece 25 further includes a short-circuit part 252, the two metal probes 251 are connected at both ends of the short-circuit part 252, and the two metal probes 251 and the short-circuit part 252 are an integrated structure formed by one-piece processing.

[0069] In some embodiments, the first signal is used to determine that the battery pack 10 is located at the bottom, thereby facilitating encoding of the communication address of the battery pack 10.

[0070] In this way, the last battery pack 10 of the energy storage device 100 and the number of battery packs 10 can be identified.

[0071] In this embodiment, the waterproof plug 20 further comprises a mounting column 26 formed on the sealing bottom plate 22, and the electrical connecting piece 25 is connected to the mounting column 26 by injection molding. In other embodiments, the electrical connecting piece 25 can be connected to the mounting column 26 by hot melting, ultrasonic welding, or by using adhesive to adhere the electrical connecting piece 25 to the mounting column 26.

[0072] Referring to FIGS. 10-12, in some embodiments, the battery pack 10 comprises a short-circuit detection module 30, and the electrical connecting piece 25 is used to short-circuit the connection terminal 12 so that the short-circuit detection module 30 detects the first signal.

[0073] In this way, the last battery pack 10 of the energy storage device 100 and the number of battery packs 10 can be identified by detecting the first signal through the short-circuit detection module 30.

[0074] Specifically, a plurality of battery packs 10 are stacked, and the stacked battery packs 10 communicate with each other and are identified according to different addresses. For example, the uppermost battery pack 10 is the first one, and the address increases by 1 from top to bottom. The bottommost battery pack 10 is the last one. The short-circuit detection module 30 can identify the first signal of the electrical connecting piece 25 short-circuiting the connection terminal 12. Since only the bottommost battery pack 10 is short-circuited, if the battery pack 10 does not generate the first signal, it is not the bottommost battery pack 10, and the address needs to be increased by 1. If the battery pack 10 generates the first signal, the short-circuit detection module 30 identifies the signal and determines that it is the last battery pack 10. At this time, the address no longer increases, and the number of battery packs 10 is determined according to the address of the last battery pack 10.

[0075] Referring to FIG. 10, in some embodiments, the connection terminal 12 comprises a first detection foot 123 and a second detection foot 124, and the first detection foot 123 and the second detection foot 124 are connected to the short-circuit detection module 30. The first detection foot 123 is connected to the ground terminal 14, and a first resistor 16 is arranged between the first detection foot 123 and the ground terminal 14.

[0076] In this way, the short-circuit detection module 30 can detect the signal flow between the first detection foot 123 and the second detection foot 124 to identify whether this is the last battery pack 10.

[0077] Specifically, when the waterproof plug 20 is not installed, the first detection pin 123 is pulled down to low level by the first resistor 16, and the short detection module 30 outputs a set square wave electrical signal to the second detection pin 124. Since the first detection pin 123 and the second detection pin 124 are not shorted, the first detection pin 123 cannot receive the square wave electrical signal, and the short detection module 30 cannot detect the square wave electrical signal, so as to determine that the battery pack 10 is not located at the bottom.

[0078] When the waterproof plug 20 is installed, the first detection pin 123 and the second detection pin 124 are communicated by the electrical connector 25 of the waterproof plug 20, and the short detection module 30 outputs a set square wave electrical signal to the second detection pin 124. Due to the short circuit, the first detection pin 123 also receives the square wave electrical signal, and the short detection module 30 recognizes the square wave electrical signal returned by the first detection pin 123, so as to determine that the battery pack 10 is located at the bottom.

[0079] Please refer to FIG. 11, in another embodiment, the connection terminal 12 includes a first detection pin 123 and a second detection pin 124, the first detection pin 123 is connected with the short detection module 30 and the ground terminal 14 respectively, and the second resistor 17 is arranged between the first detection pin 123 and the ground terminal 14, and the second detection pin 124 is connected with the power supply terminal 15.

[0080] In this way, the level of the first detection pin 123 can be detected by the short detection module 30, and if it is low level, it is not the last battery pack 10.

[0081] Specifically, when the waterproof plug 20 is not installed, the first detection pin 123 is pulled down to low level by the resistor, and the short detection module 30 recognizes that the first detection pin 123 is low level, so as to determine that the battery pack 10 is not located at the bottom.

[0082] When the waterproof plug 20 is installed, the first detection pin 123 and the second detection pin 124 are communicated by the electrical connector 25, the first detection pin 123 is connected with the power supply terminal through the second detection pin 124, the level of the first detection pin 123 is raised, and the short detection module 30 recognizes that the level of the first detection pin 123 is raised, so as to determine that the battery pack 10 is located at the bottom.

[0083] Please refer to FIG. 12, in another embodiment, the connection terminal 12 includes a first detection pin 123 and a second detection pin 124, the first detection pin 123 is connected with the short detection module 30 and the power supply terminal 15 respectively, the third resistor 18 is arranged between the first detection pin 123 and the power supply terminal 15, and the second detection pin 124 is connected with the ground terminal 14.

[0084] In this way, the level of the first detection pin 123 can be detected by the short detection module 30, and if it is high level, it is not the last battery pack 10.

[0085] Specifically, when the waterproof plug 20 is not installed, the first detection pin 123 is connected with the power supply end 15, and the first detection pin 123 is pulled up to high level by the resistor, and the short detection module identifies that the first detection pin 123 is high level, so as to determine that the battery pack 10 is not located at the bottom.

[0086] When the waterproof plug 20 is installed, the first detection pin 123 and the second detection pin 124 are connected by the electrical connecting piece 25, the first detection pin 123 is connected with the ground end 14 through the second detection pin 124, and the level of the first detection pin 123 is lowered, and the short detection module identifies that the level of the first detection pin 123 is lowered, so as to determine that the battery pack 10 is located at the bottom.

[0087] Referring to FIG. 13, in some embodiments, the connection terminal 12 includes the first detection pin 123 and the second detection pin 124, the first detection pin 123 is connected with the power supply end 15, and the second detection pin 124 is connected with the ground end 14 through the fourth resistor 19. The electrical connecting piece 25 includes the fourth detection pin 253 and the fifth detection pin 254, the fourth detection pin 253 is connected with the fifth detection pin 254 through the fifth resistor 255, the waterproof plug 20 seals the opening, the fourth detection pin 253 is electrically connected with the first detection pin 123, the fifth detection pin 254 is electrically connected with the second detection pin 124, and the short detection module 30 detects the first signal by detecting the level of the fifth detection pin 254.

[0088] In this way, the short detection module 30 detects the first signal by detecting the level of the fifth detection pin 254, and the communication address of the bottommost battery pack 10 can be determined.

[0089] Specifically, when the waterproof plug 20 seals the opening 111, the first detection pin 123 is in conduction with the fourth detection pin 253, and the second detection pin 124 is in conduction with the fifth detection pin 254. The second detection pin 124 is connected with the ground end 14 through the fourth resistor 19, the fourth detection pin 253 is connected with the fifth detection pin 254 through the fifth resistor 255, the first detection pin 123, the fourth detection pin 253, the second detection pin 124 and the fifth detection pin 254 supply power for the short detection module 30, the fourth resistor 19 and the fifth resistor 255 are in conduction to form a voltage dividing circuit, the voltage at the second detection pin 124 and the fifth detection pin 254 is reduced, and the short detection module 30 detects the first signal by detecting the level of the fifth detection pin 254.

[0090] In one embodiment, the fourth resistor 19 and the fifth resistor 255 have the same resistance value, and the voltage of the second detection pin 124 and the fifth detection pin 254 is half of the supply voltage after voltage division by the fourth resistor 19 and the fifth resistor 255. In this way, by detecting the voltage at the second detection pin 124 and / or the fifth detection pin 254, it can be detected whether the waterproof plug 20 is installed on the bottommost battery pack 10, that is, whether the battery pack 10 is short-circuited.

[0091] Referring to FIGS. 13-15, in some embodiments, the energy storage device 100 includes a water immersion detection module 40 and a water immersion detection piece 41, the water immersion detection module 40 is electrically connected to the water immersion detection piece 41. In the case that the waterproof plug 20 seals the opening 111 and the waterproof plug 20 is immersed in water, the water immersion detection module 40 is configured to detect a second signal emitted by the water immersion detection piece 41 to determine that the waterproof plug 20 is immersed in water, and in the case that the second signal is detected, the control electrical connection 25 emits a water immersion alarm signal.

[0092] In this way, the waterproof plug 20 has a water immersion detection function, which can timely detect the water immersion condition at the bottom of the battery pack 10, thereby protecting the safety of the energy storage device.

[0093] Specifically, the water immersion detection module 40 is configured to detect a second signal emitted by the water immersion detection piece 41 to determine that the waterproof plug 20 is immersed in water, and in the case that the second signal is detected, the control electrical connection 25 emits a water immersion alarm signal.

[0094] The waterproof plug 20 is installed at the opening 111 of the battery pack 10, and the electrical connection 25 is connected to the connection terminal 12 of the waterproof plug 20. In the case that the waterproof plug 20 seals the opening 111 and is immersed in water, the water immersion detection piece 41 forms a second signal, and the water immersion detection module 40 can determine that the waterproof plug 20 is immersed in water according to the second signal.

[0095] The short-circuit detection module 30 has an alarm function, in the case that the second signal is detected, the control electrical connection 25 emits a water immersion alarm signal, so that the user can be prompted in time when the bottom of the energy storage device 100 is immersed in water.

[0096] Optionally, the water immersion detection module 40 can have an automatic power-off function, in the case that the second signal is obtained to determine that the bottom of the battery pack 10 is immersed in water, an automatic power-off instruction can be sent to the BMS to control the energy storage device 100 to stop charging or external power supply, thereby preventing the internal components of the energy storage device 100 from being damaged and causing safety hazards.

[0097] In some embodiments, the water immersion detection module 40 and the water immersion detection piece 41 are arranged on the waterproof plug 20.

[0098] In this way, the water immersion detection function of the energy storage device 100 is arranged in the waterproof plug 20, and the battery pack 10 can realize the water immersion detection function by installing the waterproof plug 20 at the bottom of the battery pack 10.

[0099] Specifically, the waterproof plug 20 is used to close the opening of the battery pack 10 and short-circuit the bottommost battery pack 10. The water immersion detection module 40 and the water immersion detection piece 41 are arranged in the waterproof plug 20, which can expand the function of the waterproof plug 20, and the battery pack 10 can realize the water immersion detection function by installing the waterproof plug 20 at the bottom of the battery pack 10, thereby reducing the potential safety hazards of the energy storage device 100.

[0100] Further, the short-circuit detection module 30, the water immersion detection module 40, and the water immersion detection piece 41 are all arranged in the waterproof plug 20, so that the short-circuit detection and water immersion detection functions of the energy storage device 100 are integrated in the waterproof plug 20, which not only makes the function of the waterproof plug 20 rich, but also realizes the sealing and short-circuiting of the battery pack 10 and the water immersion detection at the same time by simply installing the waterproof plug 20.

[0101] In other embodiments, one of the short-circuit detection and water immersion detection functions can be arranged on the waterproof plug 20, and the other function can be arranged on the shell of the battery pack 10.

[0102] It can be understood that the short-circuit detection module 30 and the water immersion detection module 40 can be a microcontroller unit (MCU) arranged on the waterproof plug 20. Specifically, the short-circuit detection module 30 and the water immersion detection module 40 can be integrated into one control chip, or the short-circuit detection module 30 and the water immersion detection module 40 can use a control chip separately and be arranged on the waterproof plug 20 respectively.

[0103] In some embodiments, the connection terminal 12 includes a first detection foot 123, a second detection foot 124, and a third detection foot 125, the first detection foot 123 is connected to the power supply end 15, the second detection foot 124 is connected to the ground end 14 through the fourth resistor 19, and the third detection foot 125 is connected to the ground end 14; the electrical connection piece 25 includes a fourth detection foot 253, a fifth detection foot 254, and a sixth detection foot 256; when the waterproof plug 20 closes the opening, the fourth detection foot 253 is electrically connected to the first detection foot 123 as the power supply end 15 of the water immersion detection module 40, the sixth detection foot 256 is electrically connected to the third detection foot 125 as the ground end 14 of the water immersion detection module 40, and the fifth detection foot 254 is electrically connected to the second detection foot 124, and the fifth detection foot 254 is configured to receive the control instruction of the water immersion detection module 40 to issue a water immersion alarm signal.

[0104] In this way, according to the second signal of the water immersion detection piece 41, it can be determined that the waterproof plug 20 is immersed in water and an alarm is issued.

[0105] Specifically, when the waterproof plug 20 seals the opening, the connecting terminal 12 and the electrical connector 25 are connected, the fourth detection pin 253 is electrically connected with the first detection pin 123 as the power supply end 15 of the water immersion detection module 40, and the sixth detection pin 256 is electrically connected with the third detection pin 125 as the ground end 14 of the water immersion detection module 40, thereby supplying power to the water immersion detection element 41 and the water immersion detection module 40.

[0106] The water immersion detection element 41 is configured to send a second signal when the waterproof plug 20 seals the opening 111 and the waterproof plug 20 is immersed in water. The water immersion detection module 40 can have an alarm function. When the second signal is detected, the electrical connector 25 sends a water immersion alarm signal, so that the user can be prompted in time when the bottom of the energy storage device 100 is immersed in water.

[0107] In one embodiment, the first detection pin 123, the second detection pin 124, and the third detection pin 125 of the connecting terminal 12 can be needle seats, and the fourth detection pin 253, the fifth detection pin 254, and the sixth detection pin 256 of the electrical connector 25 can be signal pins. When the waterproof plug 20 seals the opening 100, the signal pins of the electrical connector 25 are inserted into the needle seats of the connecting terminal 12, thereby achieving electrical connection between the electrical connector 25 and the connecting terminal 12.

[0108] In other embodiments, the first detection pin 123, the second detection pin 124, and the third detection pin 125 of the connecting terminal 12 can be signal pins, and the fourth detection pin 253, the fifth detection pin 254, and the sixth detection pin 256 of the electrical connector 25 can be needle seats.

[0109] Please refer to FIG. 16. In some embodiments, the water immersion detection element 41 is arranged on the sealing bottom plate 22 of the waterproof plug 20, and the water immersion detection element 41 includes two conductive wires 411 arranged on the surface of the sealing bottom plate 22 away from the battery pack 10.

[0110] In this way, by detecting the resistance value of the conductive wire 411, whether the bottom of the battery pack 10 is immersed in water can be detected.

[0111] Specifically, the water immersion detection element 41 includes two conductive wires 411 arranged on the surface of the sealing bottom plate 22 away from the battery pack 10. When the sealing bottom plate 22 is dry, the resistance of the detection unit is large. When the sealing bottom plate 22 is immersed in water, the two conductive wires 411 are conductive, and the resistance is significantly reduced, so that whether the sealing bottom plate 22 is immersed in water can be determined according to the change of the resistance of the detection unit.

[0112] The two conductive wires 411 are arranged side by side on the bottom surface of the waterproof plug 20 and are at the lowest position of the entire battery pack 10 case and are electrically connected to the short circuit detection module 30.

[0113] When there is no water immersion, the two conductive wires 411 are insulated, and the resistance is high (more than 1000K ohms); when water is immersed in the bottom of the case, the water conducts between the two conductive wires 411, and the resistance becomes small, less than 1000K ohms, usually tens to 200K ohms.

[0114] The water immersion detection module 40 is connected to the water immersion detection piece 41 through the water immersion detection port. When water is immersed in the sealed bottom plate 22, the resistance between the two conductive wires 411 becomes small, less than a set value (such as less than 200K ohms), and the short circuit detection module 30 can control the fifth detection pin 254 to output a square wave signal at a preset frequency, sending an alarm signal that the bottom of the battery pack 10 has water.

[0115] Please refer to FIG. 14, in some embodiments, the battery pack 10 includes an identification unit 50, which is configured to determine that the battery pack 10 is in an unshort-circuited state when the potential of the second detection pin 124 is a third signal.

[0116] In this way, the battery pack 10 has a short circuit detection function.

[0117] Specifically, when the bottom of the battery pack 10 is not installed with the waterproof plug 20, the voltage of the second detection pin 124 is pulled down to the same voltage as the ground end 14 by the fourth resistor 19, so that the BMS of the battery pack 10 can identify that the bottom of the battery pack 10 is not installed with the waterproof plug 20, or that the battery pack 10 is not short-circuited, through the third signal of the second detection pin 124.

[0118] The short circuit detection module 30 identifies that the voltage value of the second detection pin 124 is between the voltage values of the power supply end 15 and the ground end 14, that is, the waterproof plug 20 seals the opening 111, and the battery pack 10 is short-circuited. The short circuit detection module 30 identifies that the voltage value of the second detection pin 124 is the same as the voltage of the ground end 14, that is, the bottom of the battery pack 10 is not installed with the waterproof plug 20, or the battery pack 10 is not short-circuited. Further, the battery pack 10 is not short-circuited, which can be judged that the battery pack 10 is not the bottommost battery pack.

[0119] Please refer to FIGS. 1-8, in some embodiments, the connection terminal 12 includes a first guide portion 126, and the waterproof plug 20 includes a second guide portion 27, and the waterproof plug 20 is configured to be guided by the cooperation of the first guide portion 126 and the second guide portion 27 to ensure that the electrical connection piece 25 is aligned and inserted into the connection terminal 12.

[0120] In this way, the first guide portion 126 and the second guide portion 27 are cooperatively guided, which is conducive to the accurate insertion of the electrical connection piece 25 into the connection terminal 12.

[0121] Specifically, the first guide part 126 and the connecting terminal 12 are integrally formed, and the second guide part 27 and the waterproof plug 20 are also integrally formed.

[0122] In some embodiments, the connecting terminal 12 includes a terminal part 127 in a columnar shape, the first guide part 126 includes an outer column surface 1271 of the terminal part 127, and the second guide part 27 includes a guide sleeve 271 extending upward from the sealing bottom plate 22 and matched with the outer column surface 1271.

[0123] In this way, the guide sleeve 271 matched with the outer column surface 1271 can limit the freedom in two directions at the same time, thereby improving the matching precision of the electric connector 25 and the connecting terminal 12.

[0124] Specifically, the terminal part 127 is in a semicolumnar shape, the outer column surface 1271 is an outer cylindrical surface, and the surface of the guide sleeve 271 matched with the outer column surface 1271 is an inner cylindrical surface. Further, the number of the terminal part 127 is two, two guide sleeves 271 are arranged at two ends of the first guide part 126 respectively, and the number of the guide sleeve 271 is two, two guide sleeves 271 are arranged at two ends of the second guide part 27 respectively.

[0125] In some embodiments, the first guide part 126 further includes a guide hole 1261 formed on the end face of the terminal part 127, the second guide part 27 includes a guide column 272 extending upward from the sealing bottom plate 22 and matched with the guide hole 1261, and the height of the guide column 272 is greater than the height of the guide sleeve 271.

[0126] In this way, the guide column 272 matched with the guide hole 1261 can further improve the matching precision of the electric connector 25 and the connecting terminal 12, and in addition, the height of the guide column 272 is greater than the height of the guide sleeve 271, so that the guide column 272 and the guide hole 1261 can be matched and guided first, and the subsequent matching of the guide structure is simpler.

[0127] Specifically, the number of the guide column 272 is multiple, and the guide column 272 and the guide hole 1261 are arranged one by one. In the embodiments of the present application, the number of the guide column 272 is three, the shapes and sizes of the three guide columns 272 are completely same, and the electric connector 25 is arranged between two guide columns 272.

[0128] Please refer to FIG. 1 and FIG. 5, in some embodiments, the waterproof plug 20 includes a sealing bottom plate 22, the second connecting part 21 is formed on the sealing bottom plate 22, the second connecting part 21 extends into the opening 111 and matches with the first connecting part 121, and the sealing bottom plate 22 seals the opening 111 outside the shell 11.

[0129] In this way, the waterproof plug 20 has a simple structure and is easy to process, which is conducive to reducing the production cost.

[0130] Specifically, in the embodiments of the present application, the sealing bottom plate 22 is a plate member with a relatively small thickness. It is easy to understand that the size of the sealing bottom plate 22 should be larger than the size of the opening 111. Further, when the waterproof plug 20 is installed on the shell 11, the area where the surface of the sealing bottom plate 22 close to the shell 11 is attached to the shell 11 can be provided with a sealing pattern.

[0131] Further, all the corners of the sealing bottom plate 22 are provided with a transition chamfer, which is convenient for processing and can also prevent scratching and improve the safety of the producers and assembly personnel.

[0132] In some embodiments, the sealing bottom plate 22 is in the shape of a racetrack, and the two ends of the sealing bottom plate 22 in the length direction are curved out in the direction away from the shell 11 to form a curved edge 221.

[0133] In this way, the two ends of the sealing bottom plate 22 are provided with the curved edge 221, which is convenient for the disassembly and assembly of the waterproof plug 20.

[0134] Specifically, the curved edge 221 is in the shape of a semicircle, and the diameter of the semicircle is connected to the sealing bottom plate 22. The included angle formed by the curved edge 221 and the shell 11 should not be too small, and a too small included angle cannot provide sufficient convenience when the waterproof plug 20 is installed or removed. The included angle formed by the curved edge 221 and the shell 11 should also not be too large, and a too large included angle will make the curved edge 221 extend outward for a long distance, so that the curved edge 221 is easily subjected to impact. If the curved edge 221 is subjected to impact, the waterproof plug 20 is easily detached, the waterproof of the battery pack 10 is damaged, and a safety hazard is caused. At the same time, a too large included angle is easy to cause the curved edge 221 to break when the curved edge 221 is subjected to impact, causing damage to the waterproof plug 20 and increasing the cost of maintenance and care of the battery pack 10. In the embodiments of the present application, the included angle formed by the curved edge 221 and the shell 11 is 15°-45°, and preferably, the included angle formed by the curved edge 221 and the shell 11 is 30°.

[0135] Please refer to FIGS. 4-7. In some embodiments, the connecting terminal 12 includes a terminal base 122, the terminal base 122 includes a first connecting cylinder 1221; the waterproof plug 20 includes a second connecting cylinder 23, the second connecting cylinder 23 extends upward from the sealing bottom plate 22 through the opening 111 and cooperates with the first connecting cylinder 1221; the first connecting portion 121 includes the inner wall of the first connecting cylinder 1221, the second connecting portion 21 includes an elastic member 24 sleeved on the second connecting cylinder 23; the waterproof plug 20 is connected with the connecting terminal 12 through the interference fit connection of the elastic member 24 and the first connecting cylinder 1221.

[0136] In this way, the elastic member 24 can fix the waterproof plug 20 on the first connecting cylinder 1221, and at the same time, the elastic member 24 can improve the waterproof effect of the waterproof plug 20.

[0137] Specifically, the connecting terminal 12 is fixed on the shell 11 of the battery pack 10 through a terminal base 122, the terminal base 122 includes a mounting portion and a first connecting cylinder 1221, and the terminal base 122 is mounted on the shell 11 of the battery pack 10 through a fastener penetrating the mounting portion. The first connecting cylinder 1221 is hollow inside, and the cavity is narrow at the top and wide at the bottom, and the bottom outlet corresponds to the opening 111 of the shell 11.

[0138] The sealing bottom plate 22 and the second connecting cylinder 23 are integrally formed in an integrated structure, and the second connecting cylinder 23 is arranged at the middle of the sealing bottom plate 22. The sealing bottom plate 22 can be made of the same material as the shell 11. The side of the sealing bottom plate 22 away from the second connecting portion 21 is provided with a groove corresponding to the position of the second connecting portion 21, so as to prevent defects such as shrinkage holes and stress concentration from being formed at this position during injection molding.

[0139] The elastic member 24 is in a whole cylinder shape, and the elastic member 24 is sleeved on the outer surface of the second connecting cylinder 23. When the waterproof plug 20 is mounted on the battery pack 10, the elastic member 24 is at least partially located between the first connecting cylinder 1221 and the second connecting cylinder 23. The elastic member 24 is elastically deformed, and the two sides thereof abut against the inner wall of the first connecting cylinder 1221 and the outer wall of the second connecting cylinder 23 respectively, so as to seal the opening 111. In addition, the frictional force generated between the elastic member 24 and the inner wall of the first connecting cylinder 1221 and the outer wall of the second connecting cylinder 23 can fix the waterproof plug 20 in the opening 111, so as to avoid easy falling off of the waterproof plug 20.

[0140] Optionally, the material of the elastic member 24 can be rubber, silicone, elastic plastic or other materials with certain elasticity.

[0141] Referring to FIG. 5, in some embodiments, the elastic member 24 includes a plurality of reverse buckle rings 241, and the plurality of reverse buckle rings 241 are arranged along the axial direction of the second connecting cylinder 23.

[0142] In this way, the plurality of reverse buckle rings 241 form a plurality of waterproof structures, which further improves the waterproof effect of the waterproof plug 20.

[0143] Specifically, the reverse buckle ring 241 is arranged on the outer surface of the elastic member 24, one end of the reverse buckle ring 241 is connected to the outer surface of the elastic member 24, and the other end abuts against the inner wall of the first connecting cylinder 1221.

[0144] The first reverse buckle ring 241 is downwardly inclined, and the included angle between the reverse buckle ring 241 and the horizontal plane is about 30°. In the embodiment of the application, the number of the reverse buckle rings 241 is three, and the three reverse buckle rings 241 are equidistantly distributed along the axial direction of the second connecting cylinder 23. Further, the thickness of the reverse buckle ring 241 should not be too thin. If the thickness of the reverse buckle ring 241 is too thin, the sealing effect is poor, and the reverse buckle ring 241 is easy to be damaged. The thickness of the reverse buckle ring 241 should also not be too thick. If the thickness of the reverse buckle ring 241 is too thick, the elasticity of the reverse buckle ring 241 is poor, which is not conducive to the installation and dismounting of the waterproof plug 20.

[0145] Referring to FIG. 1, FIG. 4 to FIG. 6, in some embodiments, the elastic member 24 comprises a sealing gasket 242 located on the sealing bottom plate 22, and the sealing gasket 242 is located between the outer shell 11 and the sealing bottom plate 22.

[0146] In this way, the sealing gasket 242 forms another waterproof structure between the outer shell 11 and the sealing bottom plate 22, which is conducive to further improving the waterproof effect of the waterproof plug 20.

[0147] Specifically, the elastic member 24 is an integrated structure formed by one-piece injection molding, and the sealing gasket 242 is located at one end of the elastic member 24 close to the sealing bottom plate 22. Further, the surface of the sealing gasket 242 in contact with the sealing bottom plate 22 and / or the surface of the sealing gasket 242 in contact with the outer shell 11 can be provided with anti-slip sealing patterns.

[0148] Referring to FIG. 7, in some embodiments, a fillet is formed at the junction between the outer cylindrical surface 1271 of the terminal portion 127 and the end surface.

[0149] In this way, the fillet can play a guiding and righting role, making it easier to achieve cooperative guidance between the guide sleeve 271 and the outer cylindrical surface 1271.

[0150] Specifically, the fillet forms a quarter outer spherical surface, and the radius of the outer spherical surface is the same as the radius of the outer cylindrical surface 1271.

[0151] In some embodiments, the battery pack 10 comprises a plurality of battery packs 10, and the battery packs 10 are stacked, each battery pack 10 is connected to the battery pack 10 below through the connecting terminal 12, and the bottom battery pack 10 is connected to the waterproof plug 20.

[0152] Specifically, the number of battery packs 10 can be set according to actual needs, and the waterproof plug 20 is arranged at the opening 111 at the bottom of the bottommost battery pack 10.

[0153] In the description of the present specification, the description of the terms "some embodiments", "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the described embodiments or examples are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0154] In addition, the terms "first", "second", etc. are used only for the purpose of description, and should not be understood as indicating or implying relative importance or a specific number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example two, three, unless otherwise explicitly and specifically limited.

[0155] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. An energy storage device, wherein, The energy storage device comprises: a battery pack comprising a housing formed with an opening and a connection terminal provided at the opening, the connection terminal comprising a first connecting part; and a waterproof plug comprising a second connecting part, the waterproof plug being configured to be connected with the connection terminal through cooperation of the first connecting part and the second connecting part and seal the opening.

2. The energy storage device of claim 1, wherein, The waterproof plug further comprises an electrical connecting piece configured to be inserted into the connection terminal to be electrically connected with the connection terminal to form a first signal.

3. The energy storage device of claim 2, wherein, The first signal is used to determine that the battery pack is located at the bottom.

4. The energy storage device of claim 2, wherein, The battery pack comprises a short-circuit detection module, and the electrical connecting piece is used to short-circuit the connection terminal to make the short-circuit detection module detect the first signal.

5. The energy storage device of claim 4, wherein, The connection terminal comprises a first detection leg and a second detection leg, the first detection leg and the second detection leg are connected with a short-circuit detection module, the first detection leg is connected with a ground terminal, and a first resistor is arranged between the first detection leg and the ground terminal.

6. The energy storage device of claim 4, wherein, The connection terminal comprises a first detection leg and a second detection leg, the first detection leg is connected with a short-circuit detection module and a ground terminal respectively, a second resistor is arranged between the first detection leg and the ground terminal, and the second detection leg is connected with a power supply terminal.

7. The energy storage device of claim 6, wherein, The connection terminal comprises a first detection leg and a second detection leg, the first detection leg is connected with a short-circuit detection module and a power supply terminal respectively, a third resistor is arranged between the first detection leg and the power supply terminal, and the second detection leg is connected with a ground terminal.

8. The energy storage device of claim 6, wherein, The connection terminal comprises a first detection leg and a second detection leg, the first detection leg is connected with a power supply terminal, the second detection leg is connected with a ground terminal through a fourth resistor, the electrical connecting piece comprises a fourth detection leg and a fifth detection leg, the fourth detection leg is connected with the fifth detection leg through a fifth resistor, in a case where the waterproof plug seals the opening, the fourth detection leg is electrically connected with the first detection leg, the fifth detection leg is electrically connected with the second detection leg, and the short-circuit detection module detects the first signal by detecting a level of the fifth detection leg.

9. The energy storage device of claim 8, wherein, The energy storage device comprises a water immersion detection module and a water immersion detection piece, the water immersion detection module is electrically connected with the water immersion detection piece, in a case where the waterproof plug seals the opening and the waterproof plug is immersed in water, the water immersion detection module is configured to detect a second signal emitted by the water immersion detection piece to determine that the waterproof plug is immersed in water.

10. The energy storage device of claim 9, wherein, The water immersion detection module is configured to control the electrical connecting piece to emit a water immersion alarm signal in a case where the second signal is detected.

11. The energy storage device of claim 9, wherein, The water immersion detection module and the water immersion detection piece are arranged in the waterproof plug.

12. The energy storage device of claim 9, wherein, The connecting terminal comprises a first detection leg, a second detection leg and a third detection leg, the first detection leg is connected to a power supply end, the second detection leg is connected to a ground end through a fourth resistor, and the third detection leg is connected to the ground end; the electric connector comprises a fourth detection leg, a fifth detection leg and a sixth detection leg; when the waterproof plug seals the opening, the fourth detection leg is electrically connected to the first detection leg as a power supply end of the water immersion detection module, the sixth detection leg is electrically connected to the third detection leg as a ground end of the water immersion detection module, and the fifth detection leg is electrically connected to the second detection leg, and the fifth detection leg is configured to receive a control instruction of the water immersion detection module to send a water immersion alarm signal.

13. The energy storage device of claim 9, wherein, The water immersion detection member is arranged on a sealing bottom plate of the waterproof plug, and the water immersion detection member comprises two conductive wires which are arranged on a surface of the sealing bottom plate away from the battery pack.

14. The energy storage device of claim 8, wherein, The battery pack comprises an identification unit configured to determine that the battery pack is in an unshort-circuit state when a level of the second detection leg is a third signal.

15. The energy storage device of claim 2, wherein, The connecting terminal comprises a first guide portion, and the waterproof plug comprises a second guide portion, the waterproof plug is configured to be inserted into the connecting terminal through cooperation of the first guide portion and the second guide portion to ensure that the electric connector is aligned.

16. The energy storage device of claim 15, wherein, The connecting terminal comprises a terminal portion in a columnar shape, the first guide portion comprises an outer columnar surface of the terminal portion, and the second guide portion comprises a guide sleeve extending upward from the sealing bottom plate and cooperating with the outer columnar surface.

17. The energy storage device of claim 16, wherein, The first guide portion further comprises a guide hole formed in an end surface of the terminal portion, the second guide portion comprises a guide column extending upward from the sealing bottom plate and cooperating with the guide hole, and a height of the guide column is greater than a height of the guide sleeve.

18. The energy storage device of claim 17, wherein, A rounded corner is formed at a connection between the outer columnar surface and the end surface of the terminal portion.

19. The energy storage device of claim 1, wherein, The waterproof plug comprises a sealing bottom plate, the second connecting portion is formed on the sealing bottom plate, the second connecting portion extends into the opening and cooperates with the first connecting portion, and the sealing bottom plate seals the opening outside the shell.

20. The energy storage device of claim 19, wherein, The sealing bottom plate is in a runway shape, and both ends of the sealing bottom plate in a length direction are tilted away from the shell to form tilted edges.

21. The energy storage device of claim 19, wherein, The connecting terminal comprises a terminal base comprising a first connecting cylinder, the waterproof plug comprises a second connecting cylinder extending upward from the sealing bottom plate through the opening and cooperating with the first connecting cylinder, the first connecting portion comprises an inner wall of the first connecting cylinder, and the second connecting portion comprises an elastic member sleeved on the second connecting cylinder; the waterproof plug and the connecting terminal are connected through interference fit of the elastic member and the first connecting cylinder.

22. The energy storage device of claim 21, wherein, The elastic member comprises a plurality of reverse clamping rings arranged along an axial direction of the second connecting cylinder.

23. The energy storage device of claim 21, wherein, The elastic member comprises a sealing gasket on the sealing bottom plate, and the sealing gasket is located between the shell and the sealing bottom plate.

24. The energy storage device of claim 1, wherein, The battery pack includes a plurality of battery packs, the battery packs are stacked, each battery pack is connected with the battery pack below through the connecting terminal, and the bottom battery pack is connected with the waterproof plug.

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