energy storage device

Abstract

The application relates to the technical field of energy storage, and discloses an energy storage device, which comprises a shell, an electric core assembly and a connecting assembly, the shell is provided with a containing hole and a containing cavity for containing the electric core assembly; the connecting assembly penetrates through the containing hole, one end of the connecting assembly extends to the containing cavity and is electrically connected with the electric core assembly, the other end of the connecting assembly extends to the outside of the containing hole, the connecting assembly is used for connecting an electric device, and the electric core assembly supplies power to the electric device through the connecting assembly; wherein the gap between the connecting assembly and the containing hole is filled with sealing glue. The application aims to solve the technical problem that the sealing performance at the connecting position of the conductive terminal and the shell is poor and the safety of the energy storage device is reduced.

Description

Technical Field

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

[0002] Energy storage devices are devices that can store electrical energy and release it when needed, supplying power to electrical devices and ensuring their normal operation. Energy storage devices are formed by encapsulating battery cell components in a casing. The casing protects the battery cell components from external environmental damage, such as impact, compression, and moisture, ensuring the stability and reliability of the energy storage device. The waterproof performance of the casing is crucial to the safety of the energy storage device.

[0003] In current technology, energy storage devices typically have positive and negative conductive terminals on their casings to establish electrical connections between the battery cells and external devices. However, poor sealing at the connection points between the conductive terminals and the casing results in poor waterproofing of the casing, reducing the safety of the energy storage device. Utility Model Content

[0004] The purpose of this application is to provide an energy storage device that addresses the technical problem of poor sealing at the connection between the conductive terminals and the housing, which reduces the safety of the energy storage device.

[0005] To achieve the above objectives, this application provides an energy storage device, which includes a housing, a battery cell assembly, and a connection assembly. The housing is provided with a receiving hole and a receiving cavity for receiving the battery cell assembly.

[0006] The connecting component passes through the receiving hole, one end of the connecting component extends into the receiving cavity and is electrically connected to the battery cell assembly, and the other end of the connecting component extends outward from the receiving hole. The connecting component is used to connect an external electrical device, and the battery cell assembly supplies power to the electrical device through the connecting component.

[0007] The gap between the connecting component and the receiving hole is filled with sealant.

[0008] In the energy storage device of this application, the outer shell includes a first shell and a second shell; the receiving hole is disposed in the first shell, and the receiving cavity is disposed in the second shell; or, the receiving hole and the receiving cavity are disposed in one of the first shell and the second shell;

[0009] The first housing is an upper cover, and the second housing is a lower housing; or, the second housing is an upper cover, and the first housing is a lower housing; wherein the upper cover covers the lower housing.

[0010] In the energy storage device of this application, the connection component includes at least two first conductive terminals, which are used to connect to vehicle equipment.

[0011] In the energy storage device of this application, the connection component includes a conductive bus and a first conductive terminal. The first conductive terminal is assembled in the receiving hole, the conductive bus is disposed in the receiving cavity, one end of the conductive bus is connected to the cell assembly, and the other end of the conductive bus is connected to the first conductive terminal. The gap between the first conductive terminal and the receiving hole is filled with the sealant.

[0012] In the energy storage device of this application, the connection component includes a sealing ring, which abuts against the first conductive terminal and the receiving hole.

[0013] In the energy storage device of this application, the connection component includes a fastener, which passes through the conductive busbar and the receiving hole, and is fastened to the first conductive terminal in the receiving hole, so that the conductive busbar is fastened to the first conductive terminal.

[0014] In the energy storage device of this application, the inner peripheral wall of the receiving hole is provided with a limiting groove extending along the axial direction of the receiving hole, and the limiting groove is filled with the sealant.

[0015] In the energy storage device of this application, the inner peripheral wall of the receiving hole is provided with a plurality of limiting grooves, and the plurality of limiting grooves are equally spaced around the center of the receiving hole.

[0016] In the energy storage device of this application, the inner peripheral wall of the receiving hole is provided with a limiting groove extending along the axial direction of the receiving hole, and the limiting groove is filled with the sealant.

[0017] The conductive bus includes a terminal bracket and a second conductive terminal, the second conductive terminal is fixed to one end of the terminal bracket, and the battery cell assembly is connected to the other end of the terminal bracket;

[0018] The connection assembly includes a fastener that passes through the second conductive terminal and is securely connected to the first conductive terminal within the receiving hole.

[0019] In the energy storage device of this application, the receiving hole includes a first hole body and a second hole body, the first hole body and the second hole body are in communication, the first hole body is located on the side away from the receiving cavity, the second hole body is located on the side close to the receiving cavity, and the inner diameter of the first hole body is larger than the inner diameter of the second hole body.

[0020] The limiting groove is provided on the inner peripheral wall of the first hole, the first conductive terminal is assembled in the first hole, and the second conductive terminal is assembled in the second hole.

[0021] In the energy storage device of this application, the terminal bracket includes a first conductive part, a second conductive part, and a connecting part. The two ends of the connecting part are respectively connected to the first conductive part and the second conductive part. The first conductive part is connected to the cell assembly. The second conductive part extends toward the receiving hole. The second conductive terminal is fixed to the second conductive part.

[0022] The energy storage device of this application includes at least one of an automotive battery, a portable emergency jump starter, an outdoor energy storage power supply, and a start-stop power supply.

[0023] This application provides an energy storage device, the advantages of which are:

[0024] The energy storage device of this application includes a housing, a battery cell assembly, and a connecting assembly. The housing has a receiving hole on its surface and a receiving cavity inside. The battery cell assembly is housed within the receiving cavity and encapsulated by the housing. The connecting assembly is installed within the receiving hole. One end of the connecting assembly extends into the receiving cavity and is electrically connected to the battery cell assembly, while the other end extends outward from the receiving hole and is connected to an external electrical device. The battery cell assembly supplies power to the electrical device through the connecting assembly. This application improves the sealing performance at the receiving hole by filling the gap between the connecting assembly and the receiving hole with sealant, preventing moisture and other substances from entering the receiving cavity through the gap. This enhances the waterproof performance of the housing and strengthens the safety of the energy storage device. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of the energy storage device provided in the embodiments of this application;

[0027] Figure 2 This is one of the exploded schematic diagrams of an energy storage device provided in the embodiments of this application;

[0028] Figure 3 This is the second exploded schematic diagram of an energy storage device provided in the embodiments of this application;

[0029] Figure 4 This is one of the structural schematic diagrams of the first housing provided in the embodiments of this application;

[0030] Figure 5 for Figure 4 A magnified view of point A in the image;

[0031] Figure 6This is a second schematic diagram of the structure of the first housing provided in the embodiments of this application;

[0032] Figure 7 for Figure 6 A magnified view of point B in the image;

[0033] Figure 8 This is one of the structural schematic diagrams of the conductive bus provided in the embodiments of this application;

[0034] Figure 9 This is a second schematic diagram of the structure of the conductive bus provided in the embodiments of this application.

[0035] The markings in the image are as follows:

[0036] 10. Outer shell; 11. Receiving hole; 110. Limiting groove; 111. First hole body; 112. Second hole body; 12. Receiving cavity; 13. First housing; 14. Second housing;

[0037] 20. Connecting component; 21. First conductive terminal; 22. Conductive busbar; 221. Terminal bracket; 2211. First conductive part; 2212. Second conductive part; 2213. Connecting part; 222. Second conductive terminal; 23. Sealing ring; 24. Fastener. Detailed Implementation

[0038] The specific embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but are not intended to limit the scope of this application.

[0039] In the description of this application, it should be noted that the terms "upper", "lower", "front", "rear", "inner", "outer", etc. used in this application to indicate the orientation or positional relationship are based on the positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device and element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0040] In the description of this application, it should be understood that the terms "first," "second," etc., are used to describe various types of information, but these terms are not limited to them and are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0041] like Figures 1 to 3As shown in the figure, this application provides an energy storage device, which includes a housing 10, a battery cell assembly (not shown) and a connecting assembly 20. The housing 10 is provided with a receiving hole 11 and a receiving cavity 12 for receiving the battery cell assembly. The connecting assembly 20 passes through the receiving hole 11, one end of the connecting assembly 20 extends into the receiving cavity 12 and is electrically connected to the battery cell assembly, and the other end of the connecting assembly 20 extends outward from the receiving hole 11. The connecting assembly 20 is used to connect an external electrical device, and the battery cell assembly supplies power to the electrical device through the connecting assembly 20. The gap between the connecting assembly 20 and the receiving hole 11 is filled with sealant.

[0042] In this embodiment, multiple batteries are connected in series or parallel to form a cell assembly with a certain voltage and capacity. The cell assembly is housed within the receiving cavity 12 of the outer casing 10, and the outer casing 10 encapsulates the cell assembly to form an energy storage device. The energy storage device is connected to an external electrical device via the connection assembly 20, thereby providing power to the electrical device. The electrical device can be a household appliance, lighting equipment, power tool, etc.

[0043] Based on the above technical solution, the outer shell 10 has a receiving hole 11 on its surface and a receiving cavity 12 inside the outer shell 10. The battery cell assembly is installed in the receiving cavity 12, and the connecting assembly 20 is installed in the receiving hole 11. One end of the connecting assembly 20 extends into the receiving cavity 12 and is electrically connected to the battery cell assembly, while the other end extends outward from the receiving hole 11 and is connected to an external electrical device. The battery cell assembly supplies power to the electrical device through the connecting assembly 20. Sealant is filled in the gap between the connecting assembly 20 and the receiving hole 11 to prevent moisture and other substances from entering the receiving cavity 12 through the gap, thereby improving the sealing performance at the receiving hole 11, enhancing the waterproof performance of the outer shell 10, and strengthening the safety of the energy storage device.

[0044] The sealant is a sealing material that can deform to conform to the shape of the sealing surface, does not easily flow, and has a certain degree of adhesion. For example, the sealant includes at least one of silicone sealant, polyurethane sealant, polysulfide sealant, acrylic sealant, and butyl sealant.

[0045] In some embodiments, such as Figure 3 As shown, the outer shell 10 includes a first shell 13 and a second shell 14, with a receiving hole 11 in the first shell 13 and a receiving cavity 12 in the second shell 14. The first shell 13 is the upper cover and the second shell 14 is the lower shell; or, the second shell 14 is the upper cover and the first shell 13 is the lower shell; wherein the upper cover covers the lower shell.

[0046] Specifically, the first housing 13 and the second housing 14 can be assembled by screw connection, snap-fit ​​connection, magnetic connection, etc., and this embodiment does not impose specific restrictions.

[0047] For example, the first housing 13 is the upper cover and the second housing 14 is the lower housing. The first housing 13 has a receiving hole 11 on its surface and the second housing 14 has a receiving cavity 12. The first housing 13 covers the second housing 14. The first housing 13 and the second housing 14 are respectively provided with screw holes. The first housing 13 and the second housing 14 are assembled and fixed by screwing screws into the screw holes.

[0048] For example, the second housing 14 is the upper cover, and the first housing 13 is the lower housing. The second housing 14 has a receiving hole 11 on its surface, and the first housing 13 has a receiving cavity 12 inside. The second housing 14 covers the first housing 13. One of the first housing 13 and the second housing 14 has a hook, and the other has a slot. The first housing 13 and the second housing 14 are connected by a snap-fit ​​mechanism to achieve assembly and fixation of the first housing 13 and the second housing 14.

[0049] In some embodiments, the outer casing 10 includes a first casing 13 and a second casing 14, with a receiving hole 11 and a receiving cavity 12 disposed in one of the first casing 13 and the second casing 14. The first casing 13 is an upper cover and the second casing 14 is a lower casing; or, the second casing 14 is an upper cover and the first casing 13 is a lower casing; wherein the upper cover covers the lower casing.

[0050] For example, the first housing 13 is the upper cover, the second housing 14 is the lower housing, the second housing 14 has a receiving hole 11 on its surface, and a receiving cavity 12 is provided inside the second housing 14. The first housing 13 covers the second housing 14 and is assembled and fixed with the second housing 14.

[0051] For example, the second housing 14 is the upper cover, the first housing 13 is the lower housing, the first housing 13 has a receiving hole 11 on its surface, the first housing 13 has a receiving cavity 12 inside, and the second housing 14 covers the first housing 13 and is assembled and fixed with the first housing 13.

[0052] In some embodiments, such as Figure 3 and Figure 4 As shown, the connection assembly 20 includes at least two first conductive terminals 21, which are used to connect vehicle equipment.

[0053] For example, the connection component 20 includes two first conductive terminals 21, which are positive and negative conductive terminals, respectively, and are used to connect the positive and negative electrodes of the vehicle equipment, thereby realizing the power transmission between the energy storage device and the vehicle equipment, and providing power to the vehicle equipment through the energy storage device.

[0054] In some embodiments, such as Figure 3As shown, the connecting assembly 20 includes a conductive bus 22 and a first conductive terminal 21. The first conductive terminal 21 is assembled in the receiving hole 11, and the conductive bus 22 is disposed in the receiving cavity 12. One end of the conductive bus 22 is connected to the battery cell assembly, and the other end of the conductive bus 22 is connected to the first conductive terminal 21. The gap between the first conductive terminal 21 and the receiving hole 11 is filled with sealant.

[0055] Specifically, the conductive bus 22 has a conductive structure. The first conductive terminal 21 is assembled inside the receiving hole 11 and extends outward from the outer casing 10. The first conductive terminal 21 is connected to the electrical device via an electrical connection wire. The two ends of the conductive bus 22 are respectively connected to the battery cell assembly and the first conductive terminal 21. Electrical energy is transmitted from the battery cell assembly through the conductive bus 22 to the first conductive terminal 21, and then from the first conductive terminal 21 to the external electrical device. The conductive bus 22 can be directly connected to the battery cell assembly or connected via an electrical connection wire. The conductive bus 22 is conductive and can withstand a certain current load, ensuring that electrical energy is transmitted from the battery cell assembly to the first conductive terminal 21.

[0056] For example, the conductive bus 22 is first connected to the battery cell assembly, then the first conductive terminal 21 is assembled into the receiving hole 11 and connected to the conductive bus 22, and finally the gap between the first conductive terminal 21 and the receiving hole 11 is filled with sealant.

[0057] In some embodiments, such as Figure 3 As shown, the connecting assembly 20 includes a sealing ring 23, which abuts against the first conductive terminal 21 and the receiving hole 11.

[0058] Specifically, the sealing ring 23 has a certain elasticity. The sealing ring 23 is sleeved on the outer periphery of the first conductive terminal 21 and abuts against the inner wall of the receiving hole 11. The sealing ring 23 fits tightly against the gap between the first conductive terminal 21 and the receiving hole 11, further improving the sealing performance at the receiving hole 11.

[0059] The sealing ring 23 is made of an elastic material, such as rubber or silicone. The sealing ring 23 is a rubber ring or a silicone ring.

[0060] In some embodiments, such as Figure 3 As shown, the connection assembly 20 includes a fastener 24, which passes through the conductive busbar 22 and the receiving hole 11, and is fastened to the first conductive terminal 21 within the receiving hole 11, so that the conductive busbar 22 is fastened to the first conductive terminal 21.

[0061] For example, the first conductive terminal 21 is provided with a first screw hole, the conductive bus 22 is provided with a second screw hole, and the fastener 24 is a screw. The first conductive terminal 21 is assembled in the receiving hole 11, and the screw is passed through the first screw hole and the second screw hole and tightened, thereby realizing the tight connection between the conductive bus 22 and the first conductive terminal 21, preventing the conductive bus 22 from separating from the first conductive terminal 21 due to external forces such as vibration when transporting the energy storage device.

[0062] In some embodiments, such as Figure 5 and Figure 7 As shown, the inner peripheral wall of the receiving hole 11 is provided with a limiting groove 110 extending axially along the receiving hole 11, and the limiting groove 110 is filled with sealant.

[0063] Specifically, the extending direction of the limiting groove 110 is the same as the axial direction of the first conductive terminal 21. After the gap between the first conductive terminal 21 and the receiving hole 11 is filled with sealant, the sealant is further filled into the limiting groove 110. After the sealant cures, it is tightly bonded to the limiting groove 110. It can be understood that the sealant forms an embedded structure in the limiting groove 110 and is tightly fixed to the first conductive terminal 21, preventing the first conductive terminal 21 from rotating. This avoids problems such as poor contact and loosening caused by the rotation of the first conductive terminal 21, and improves the stability of the first conductive terminal 21.

[0064] In some embodiments, such as Figure 5 and Figure 7 As shown, the inner peripheral wall of the receiving hole 11 is provided with multiple limiting grooves 110. The multiple limiting grooves 110 are arranged at equal intervals around the center of the receiving hole 11. The sealant in the multiple limiting grooves 110 prevents the first conductive terminal 21 from axially moving and circumferentially rotating, thereby enhancing the anti-rotation effect of the first conductive terminal 21.

[0065] In some embodiments, such as Figures 3 to 8 As shown, the inner peripheral wall of the receiving hole 11 is provided with a limiting groove 110 extending axially along the receiving hole 11, and the limiting groove 110 is filled with sealant; the conductive bus 22 includes a terminal bracket 221 and a second conductive terminal 222, the second conductive terminal 222 is fixed to one end of the terminal bracket 221, and the battery cell assembly is connected to the other end of the terminal bracket 221; the connecting assembly 20 includes a fastener 24, the fastener 24 passes through the second conductive terminal 222 and is fastened to the first conductive terminal 21 in the receiving hole 11.

[0066] Specifically, after the battery cell assembly is installed in the receiving cavity 12, the conductive bus 22 is fixed on the top of the battery cell assembly, the terminal bracket 221 is electrically connected to the connection port of the battery cell assembly, and electrical energy is transmitted from the terminal bracket 221 to the second conductive terminal 222. The second conductive terminal 222 is electrically connected to the first conductive terminal 21, and electrical energy is transmitted from the first conductive terminal 21 to the electrical equipment.

[0067] In this embodiment, the fastener 24 passes through the second conductive terminal 222 and is securely connected to the first conductive terminal 21 within the receiving hole 11. The fastener 24 tightly connects the second conductive terminal 222 and the first conductive terminal 21, preventing them from separating. During installation, the fastener 24 applies a preload to the second conductive terminal 222 and the first conductive terminal 21, ensuring their contact surfaces are fully engaged, reducing contact resistance, and improving power transmission efficiency.

[0068] In some embodiments, such as Figure 7 As shown, the receiving hole 11 includes a first hole body 111 and a second hole body 112. The first hole body 111 and the second hole body 112 are connected. The first hole body 111 is located on the side away from the receiving cavity 12, and the second hole body 112 is located on the side close to the receiving cavity 12. The inner diameter of the first hole body 111 is larger than the inner diameter of the second hole body 112. The limiting groove 110 is provided on the inner peripheral wall of the first hole body 111. The first conductive terminal 21 is assembled in the first hole body 111, and the second conductive terminal 222 is assembled in the second hole body 112.

[0069] Specifically, the receiving hole 11 extends through the surface of the outer casing 10, with the first hole 111 located on the outer side and the second hole 112 located on the inner side. The shape and size of the first conductive terminal 21 are adapted to the shape and size of the first hole 111, and the shape and size of the second conductive terminal 222 are adapted to the shape and size of the second hole 112. The first conductive terminal 21 is assembled in the first hole 111, and the second conductive terminal 222 is assembled in the second hole 112. Since the inner diameter of the first hole 111 is larger than the inner diameter of the second hole 112, the second hole 112 restricts the first conductive terminal 21, preventing it from passing through the second hole 112 and entering the receiving cavity 12. In this embodiment, the second conductive terminal 222 and the first conductive terminal 21 are connected by fasteners 24, so that the first conductive terminal 21 and the second conductive terminal 222 are electrically connected and securely connected in the receiving hole 11 of the outer casing 10.

[0070] In some embodiments, such as Figure 9 As shown, the terminal bracket 221 includes a first conductive part 2211, a second conductive part 2212, and a connecting part 2213. The two ends of the connecting part 2213 are respectively connected to the first conductive part 2211 and the second conductive part 2212. The first conductive part 2211 is connected to the battery cell assembly. The second conductive part 2212 extends into the receiving hole 11. The second conductive terminal 222 is fixed to the second conductive part 2212.

[0071] Specifically, after the first conductive terminal 21 is installed, there is a certain height difference between the first conductive terminal 21 and the battery cell assembly, which is caused by the installation position of the first conductive terminal 21. In order to facilitate the electrical connection between the first conductive terminal 21 and the battery cell assembly, the terminal bracket 221 is designed as a bent structure. When the energy storage device is placed horizontally, the first conductive part 2211 extends horizontally on the upper surface of the battery cell assembly to connect to the connection port of the battery cell assembly; the second conductive part 2212 extends horizontally to facilitate the fastener 24 to pass through the second conductive terminal 222 and the first conductive terminal 21; the connecting part 2213 extends vertically and connects the first conductive part 2211 and the second conductive part 2212 respectively to realize the electrical connection between the first conductive terminal 21 and the battery cell assembly.

[0072] In some embodiments, the energy storage device includes at least one of an automotive battery, a portable emergency jump starter, an outdoor energy storage power supply, and a start-stop power supply.

[0073] For example, energy storage devices include automotive batteries. Automotive batteries are energy storage components in automobiles, used to provide a strong instantaneous current for starting the engine and to power in-vehicle electrical equipment (such as lights, audio systems, and air conditioning) while the vehicle is in motion.

[0074] For example, energy storage devices include portable emergency jump starters. Portable emergency jump starters are primarily used to provide emergency power for starting a car when its battery is low. In addition, portable emergency jump starters also have multiple output interfaces that can charge devices such as mobile phones and tablets.

[0075] For example, energy storage devices include outdoor energy storage power supplies. Outdoor energy storage power supplies are high-capacity energy storage devices capable of providing a stable power supply for various outdoor electrical devices. They typically offer multiple charging methods (such as AC charging and solar charging) to meet charging needs in different environments. Furthermore, outdoor energy storage power supplies have a large output power, supporting the simultaneous use of multiple high-power electrical devices, such as electric ovens, induction cookers, and lighting equipment.

[0076] For example, energy storage devices include start-stop power supplies. Start-stop power supplies are mainly used in automotive start-stop systems to provide a large instantaneous current when the car starts, helping the engine start quickly, and to recover energy when the car is idling or decelerating to charge the battery, thereby improving fuel economy and reducing exhaust emissions.

[0077] It should be understood that the term "and / or" as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations. It should be noted that, herein, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0078] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments. The above descriptions are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An energy storage device, characterized in that, It includes a housing, a battery cell assembly, and a connecting assembly. The housing has a receiving hole and a receiving cavity for receiving the battery cell assembly. The connecting component passes through the receiving hole, one end of the connecting component extends into the receiving cavity and is electrically connected to the battery cell assembly, and the other end of the connecting component extends outward from the receiving hole. The connecting component is used to connect an external electrical device, and the battery cell assembly supplies power to the electrical device through the connecting component. The gap between the connecting component and the receiving hole is filled with sealant.

2. The energy storage device according to claim 1, characterized in that, The outer casing includes a first casing and a second casing; the receiving hole is disposed in the first casing, and the receiving cavity is disposed in the second casing; or, the receiving hole and the receiving cavity are disposed in one of the first casing and the second casing; The first housing is an upper cover, and the second housing is a lower housing; or, the second housing is an upper cover, and the first housing is a lower housing; wherein the upper cover covers the lower housing.

3. The energy storage device according to claim 1, characterized in that, The connection assembly includes at least two first conductive terminals for connecting vehicle equipment.

4. The energy storage device according to claim 1, characterized in that, The connection assembly includes a conductive bus and a first conductive terminal. The first conductive terminal is assembled in the receiving hole. The conductive bus is disposed in the receiving cavity. One end of the conductive bus is connected to the battery cell assembly, and the other end of the conductive bus is connected to the first conductive terminal. The gap between the first conductive terminal and the receiving hole is filled with the sealant.

5. The energy storage device according to claim 4, characterized in that, The connection assembly includes a sealing ring that abuts against the first conductive terminal and the receiving hole.

6. The energy storage device according to claim 4, characterized in that, The connection assembly includes a fastener that passes through the conductive busbar and the receiving hole, and is fastened to the first conductive terminal within the receiving hole, so that the conductive busbar is fastened to the first conductive terminal.

7. The energy storage device according to claim 1, characterized in that, The inner peripheral wall of the receiving hole is provided with a limiting groove extending along the axial direction of the receiving hole, and the limiting groove is filled with the sealant.

8. The energy storage device according to claim 7, characterized in that, The inner peripheral wall of the receiving hole is provided with a plurality of limiting grooves, which are arranged at equal intervals around the center of the receiving hole.

9. The energy storage device according to claim 4, characterized in that, The inner peripheral wall of the receiving hole is provided with a limiting groove extending along the axial direction of the receiving hole, and the limiting groove is filled with the sealant. The conductive bus includes a terminal bracket and a second conductive terminal, the second conductive terminal is fixed to one end of the terminal bracket, and the battery cell assembly is connected to the other end of the terminal bracket; The connection assembly includes a fastener that passes through the second conductive terminal and is securely connected to the first conductive terminal within the receiving hole.

10. The energy storage device according to claim 9, characterized in that, The receiving hole includes a first hole body and a second hole body, the first hole body and the second hole body are in communication, the first hole body is located on the side away from the receiving cavity, the second hole body is located on the side close to the receiving cavity, and the inner diameter of the first hole body is larger than the inner diameter of the second hole body; The limiting groove is provided on the inner peripheral wall of the first hole, the first conductive terminal is assembled in the first hole, and the second conductive terminal is assembled in the second hole.

11. The energy storage device according to claim 9, characterized in that, The terminal bracket includes a first conductive part, a second conductive part, and a connecting part. The two ends of the connecting part are respectively connected to the first conductive part and the second conductive part. The first conductive part is connected to the cell assembly. The second conductive part extends into the receiving hole. The second conductive terminal is fixed to the second conductive part.

12. The energy storage device according to any one of claims 1 to 11, characterized in that, The energy storage device includes at least one of the following: automotive battery, portable emergency jump starter, outdoor energy storage power supply, and start-stop power supply.

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