Energy storage device and energy storage system

Abstract

The invention relates to the technical field of energy storage equipment, and discloses an energy storage device and an energy storage system.The shell of the energy storage device is provided with a first through hole of a first containing cavity; a support of the electric control assembly is fixed to the shell, a circuit board is fixed to the support, a confluence plate is electrically connected with the circuit board, and a part of the confluence plate corresponds to the first through hole. The terminal assembly is detachably arranged outside the first containing cavity, the first sealing piece of the terminal assembly is arranged between the shell and the conductive terminal, the bus board is connected with the first locking piece and / or the conductive terminal, and the conductive terminal is electrically connected with the electric control assembly. According to the energy storage device, the electric control assembly and the terminal assembly are detachably connected, the space between the electric control assembly and the terminal assembly is reduced, the overall structure is compact, the stress of the terminal assembly is reduced, the terminal assembly is not prone to loosening, the sealing performance in the shell is further improved, the confluence plate is fixed relative to the first side wall through the fixing base, conductive terminals can be directly installed and replaced from the outer side of the shell, and the efficiency is improved. And the assembly convenience is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of energy storage technology, and in particular, to an energy storage device and an energy storage system. Background Art

[0002] An energy storage device is a device that stores or releases electrical energy. It is widely used in photovoltaic power generation, indoor and outdoor energy storage, and transportation. Its main components include a housing, a battery pack, an electronic control mainboard, and conductive terminals. Among them, the battery pack and the electronic control mainboard are arranged in the housing, and the conductive terminals are arranged on the housing as input and output interfaces for current. At present, in existing energy storage devices, the electronic control mainboard and the conductive terminals are usually connected by thick cables. However, since thick cables are difficult to bend, a large installation space needs to be reserved between the electronic control mainboard and the conductive terminals, resulting in an overall structure that is not compact enough. Moreover, the thick cables generate greater stress when bent, which can easily cause the conductive terminals to loosen, affecting the sealing of the housing and reducing the overall reliability of the energy storage device. Summary of the invention

[0003] The embodiments of the present application provide an energy storage device and an energy storage system, which can reduce the distance between the electronic control component and the terminal component, reduce the volume of the energy storage device, and at the same time reduce the connection bending stress between the terminal component and the electronic control component, improve the sealing of the connection between the terminal component and the shell, and further provide a detachable connection between the terminal component and the electronic control component to facilitate the installation and maintenance of the terminal component.

[0004] A technical solution adopted in an embodiment of the present application is: to provide an energy storage device, including a shell, an electric control component, and a terminal assembly. The shell is provided with a first receiving chamber, the shell includes a first side wall, the first side wall is provided with a first through hole, and the first through hole connects the first receiving chamber with the outside. The electric control component is arranged in the first receiving chamber. The electric control component includes a bracket, a circuit board and a busbar, the bracket is fixed to the shell, the circuit board is fixed to the bracket, the busbar is electrically connected to the circuit board, and a part of the busbar is arranged corresponding to the first through hole. The terminal assembly is arranged outside the first receiving chamber, the terminal assembly includes a conductive terminal, a first locking member and a first sealing member, the first sealing member is arranged between the shell and the conductive terminal, a part of the first locking member is penetrated through the first through hole, and the busbar is connected to the first locking member and / or the conductive terminal, the first locking member is respectively connected to the conductive terminal and the busbar, and the conductive terminal is electrically connected to the busbar.

[0005] In some embodiments, the energy storage device includes a terminal base, which is fixedly disposed on a side of the first side wall away from the first accommodating cavity, and the terminal base has a mounting portion, the mounting portion is penetrated through the first through hole, and the mounting portion is provided with a second through hole, the conductive terminal is electrically connected to a busbar of the electronic control component from a side of the terminal base away from the first side wall, a portion of the busbar is penetrated through the second through hole, and / or a portion of the conductive terminal is penetrated through the second through hole.

[0006] In some embodiments, a first seal is disposed around the first through hole, and the first seal is disposed between the first side wall and the terminal base; along the thickness direction of the first side wall, a first contour of the conductive terminal projection is located outside a second contour of the second through hole projection, and the terminal assembly includes a second seal, the second seal is disposed around the second through hole, and the second seal is disposed between the terminal base and the conductive terminal.

[0007] In some embodiments, the conductive terminal includes a first portion and a second portion, the first portion and the second portion are bent and connected, the first locking member connects the busbar and the first portion, and the second portion extends in a direction away from the first receiving cavity.

[0008] In some embodiments, the mounting portion is recessed toward the first receiving cavity to form a second receiving cavity, a portion of the mounting portion is located in the first receiving cavity, a second through hole is provided at the bottom of the second receiving cavity, and the second sealing member abuts against the bottom of the second receiving cavity and the first portion; the terminal assembly includes an end cover, the end cover is connected to the terminal base to cover the cavity opening of the second receiving cavity, the end cover is provided with a third through hole, and the second portion passes through the third through hole.

[0009] In some embodiments, the busbar includes a main body section and a bent section connected to each other, the main body section is electrically connected to the circuit board, and the bent section is bent toward the first side wall; the electronic control component includes a fixed seat, the fixed seat is fixedly connected to the bracket, and the fixed seat fixes the bent section on the mounting portion, and the first locking member is detachably connected to the fixed seat.

[0010] In some embodiments, the first locking member includes a limiting head and a body, the body is provided with a first thread, the fixing seat is provided with a first screw hole, the first locking member passes through the first part and the bent section and is screwed to the first screw hole, and the first part and the bent section are located between the limiting head and the fixing seat.

[0011] In some embodiments, the energy storage device includes a first connector, which is connected to a side of the first portion close to the first accommodating cavity to form a whole, at least a portion of the first connector is located in the second through hole, and the first connector abuts against the busbar.

[0012] In some embodiments, the energy storage device includes a second connector, which is connected to a side of the busbar away from the first accommodating cavity to form a whole, at least a portion of the second connector is located in the second through hole, the second connector abuts against the conductive terminal, or the second connector abuts against the first connector.

[0013] Another technical solution adopted in the embodiment of the present application is: to provide an energy storage system, including an energy storage device.

[0014] The beneficial effects of the embodiments of the present application are as follows: the energy storage device is directly connected to the terminal assembly through the electronic control assembly, which reduces the space occupied between the electronic control assembly and the terminal assembly, thereby helping to reduce the overall volume of the energy storage device. The shell adopts a sheet metal design, which improves the reliability and structural strength of the product. At the same time, the first seal and the second seal are both made of silicone material, which seal the shell and the terminal base, and the conductive terminal and the terminal base respectively. This design makes the sealing structure more regular, improves the sealing performance, and extends the service life of the product. In addition, the busbar uses a copper busbar as a busbar to connect the circuit board and the conductive terminal. The busbar occupies less space, and the copper busbar has good conductivity and heat dissipation performance, which helps to improve the current transmission efficiency and improve the safety and reliability of the energy storage device; the busbar is fixed relative to the first side wall of the shell by a fixing seat, which simplifies the installation and replacement process of the conductive terminal and improves the convenience of assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application, the following is a brief introduction to the drawings required for describing the specific embodiments. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0016] Figure 1 It is an exploded diagram of the energy storage device according to an embodiment of the present application.

[0017] Figure 2 It is an exploded view of the energy storage device of the embodiment of the present application from another perspective.

[0018] Figure 3 It is a partial schematic diagram of the explosion of the energy storage device according to the embodiment of the present application.

[0019] Figure 4 It is a partial cross-sectional view of the terminal base of the energy storage device according to the embodiment of the present application.

[0020] Figure 5 It is a partial cross-sectional view of the energy storage device according to an embodiment of the present application.

[0021] Figure 6 It is an exploded view of the conductive terminal and the first connecting member of the energy storage device according to the embodiment of the present application.

[0022] Figure 7 The energy storage device of the embodiment of the present application has a first connecting member and Figure 5 Enlarged view of part A in the figure.

[0023] Figure 8 The energy storage device of the embodiment of the present application has a first connecting member and a second connecting member and Figure 5 Enlarged view of part A in the figure.

[0024] Fig. 9 It is a schematic diagram of an energy storage system according to another embodiment of the present application.

[0025] The reference numerals in the specific implementation manner are as follows: 100, energy storage device; 10, shell; 11, first receiving cavity; 12, bottom shell; 121, first side wall; 122, first through hole; 20, electronic control component; 21, bracket; 22, circuit board; 23, busbar; 231, main body section; 232, bending section; 24, fixing seat; 241, first screw hole; 30, terminal assembly; 31, conductive terminal; 311, first part; 312, second part; 32, first locking member; 321, limiting head; 322, body; 33, first sealing member; 34, terminal base; 341, mounting portion; 342, second through hole; 343, second receiving cavity; 35, second sealing member; 36, end cover; 361, third through hole; 40, first connecting member; 50, second connecting member. DETAILED DESCRIPTION

[0026] In order to facilitate the understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on another element or there can be one or more centered elements therebetween. When an element is described as "connected" to another element, it can be directly connected to another element or there can be one or more centered elements therebetween. The orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "vertical", "horizontal", etc. used in this specification is based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0027] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0028] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0029] See also Figure 1The present application provides an energy storage device 100 according to an embodiment. The energy storage device 100 includes a housing 10, an electric control assembly 20, a terminal assembly 30, and a battery assembly (not shown). The electric control assembly 20 and the battery assembly are fixedly arranged inside the housing 10, the terminal assembly 30 is arranged on the outer shell of the housing 10, and the electric control assembly 20 is electrically connected to the battery assembly and the terminal assembly 30 respectively, so that the battery assembly and the terminal assembly are electrically connected. The energy storage device 100 of the present application is directly connected through the electric control component 20 and the terminal component 30, which eliminates the connection of the electric control component 20 and the terminal component 30 through a thick cable in the prior art, reduces the space required for the original thick cable to bend, and thus reduces the space between the electric control component 20 and the terminal component 30, so that a battery component with a larger capacity can be installed, or the volume of the housing 10 can be reduced, and the space inside the housing 10 can be effectively utilized. Furthermore, the direct connection between the electric control component 20 and the terminal component 30 can reduce the bending stress of the electric control component 20 on the terminal component 30, thereby reducing the bending force of the terminal component 30, and the terminal component 30 is not easy to loosen relative to the housing 10, thereby improving the sealing inside the energy storage device 100. In addition, the electric control component 20 is fixedly arranged inside the housing 10, and the terminal component 30 can be detachably connected to the electric control component 20 from the outside of the housing 10, which is convenient for the assembly and maintenance of the terminal component 30, improving the assembly efficiency and reducing the difficulty of maintenance.

[0030] In some embodiments, see Figure 1 and Figure 5 The housing 10 of the energy storage device 100 is provided with a first receiving chamber 11. The housing 10 includes a first side wall 121. The first side wall 121 is provided with a first through hole 122. The first through hole 122 connects the first receiving chamber 11 with the outside. The electric control component 20 is arranged in the first receiving chamber 11. The terminal assembly 30 is arranged outside the first receiving chamber 11. The terminal assembly 30 includes a conductive terminal 31, a first locking member 32 and a first sealing member 33. The first sealing member 33 is arranged between the housing 10 and the conductive terminal 31. The first sealing member 33 seals the gap between the conductive terminal 31 and the housing 10 to increase the sealing performance in the housing 10. A part of the first locking member 32 is penetrated through the first through hole 122. The first locking member 32 is respectively connected to the conductive terminal 31 and the electric control component 20, so that the conductive terminal 31 is electrically connected to the electric control component 20, and the two are fixed.

[0031] For the housing 10, see Figure 1In some embodiments, the shell 10 is roughly in the shape of a rectangular parallelepiped, and the shell 10 includes a bottom shell 12 and a top cover (not shown), the bottom shell 12 is in the shape of a container with an opening, and the top cover is connected to the bottom shell 12 to cover the opening of the bottom shell 12, and together constitute a closed first receiving chamber 11. The bottom shell 12 has a first side wall 121, and a first through hole 122 is opened on the first side wall 121, and the first through hole 122 connects the first receiving chamber 11 with the outside. Of course, the gap between the bottom shell 12 and the top cover can be sealed by a sealant or other structure. In some embodiments, the shell 10 adopts a sheet metal shell design to improve the structural strength of the shell 10, thereby improving the reliability of the energy storage device 100.

[0032] For the above-mentioned electronic control component 20, please refer to Figure 1 and Figure 5 In some embodiments, the electric control component 20 includes a bracket 21, a circuit board 22 and a busbar 23. The bracket 21 is fixed inside the housing 10, and the circuit board 22 is fixed to the bracket 21, so that the circuit board 22 is fixed inside the first receiving cavity 11. A portion of the busbar 23 is electrically connected to the circuit board 22, and a portion of the busbar 23 is arranged corresponding to the first through hole 122 to facilitate connection with the first locking member 32, and / or a portion of the busbar 23 is connected to the conductive terminal 31, thereby forming an electrical connection between the circuit board 22 and the conductive terminal 31. As an example, the bracket 21 is fixed on the side of the first side wall 121 facing the first receiving cavity 11, so that the bracket 21 is closer to the first side wall 121, thereby reducing the distance between the circuit board 22 and the conductive terminal 31.

[0033] In some embodiments, see Figure 3 The busbar 23 includes a main body section 231 and a bent section 232 connected to each other. The main body section 231 is electrically connected to the circuit board 22. The bent section 232 is bent toward the first side wall 121. The bent section 232 is used to connect to the first locking member 32, and / or the bent section 232 is used to electrically connect to the conductive terminal 31. Since the circuit board 22 is provided with electronic components such as resistors and capacitors, there is a certain distance between the circuit board 22 and the first side wall 121 along the thickness direction of the first side wall 121. The distance between the busbar 23 and the first side wall 121 can be reduced by partially setting the busbar 23 to a structure bent toward the first side wall 121, so as to facilitate the connection and fixation with the conductive terminal 31 and the first locking member 32.

[0034] In some embodiments, the busbar 23 is a copper busbar, which connects the circuit board 22 and the conductive terminal 31. On the one hand, the copper busbar is easy to process to form the main section 231 and the curved section 232, which reduces the difficulty of processing. On the other hand, the copper busbar has good conductivity and heat dissipation performance, which effectively improves the efficiency of current transmission and improves the connection safety and reliability between the circuit board 22 and the conductive terminal 31. In addition, compared with the structure of thick cables in the prior art, the structure of the copper busbar is lighter, which saves the bending space of the wire harness and is conducive to reducing the overall size of the energy storage device 100.

[0035] In some embodiments, see Figure 3 and Figure 5 The electric control assembly 20 includes a fixing seat 24, which is fixedly connected to the bracket 21, and the fixing seat 24 abuts against the side of the curved section 232 away from the first side wall 121. The fixing seat 24 abuts against the mounting portion 341 of the terminal base 34, so that the fixing seat 24 supports the curved section 232. The fixing seat 24 fixes the curved section 232 to the mounting portion 341, so that the curved section 232 can be fixed relative to the bracket 21. The conductive terminal 31 and the curved section 232 are located between the first locking member 32 and the fixing seat 24, and the first locking member 32 is detachably connected to the fixing seat 24 to fix the conductive terminal 31 and the curved section 232 relative to the first side wall 121.

[0036] In some embodiments, the detachable connection between the first locking member 32 and the fixing seat 24 means that the first locking member 32 and the fixing seat 24 can be repeatedly connected and separated without destroying the structure. As an example, the first locking member 32 is a bolt, and the first locking member 32 includes a limiting head 321 and a body 322, the limiting head 321 is located at one end of the body 322, the body 322 is provided with a first thread, and the fixing seat 24 is provided with a first screw hole 241, and the first locking member 32 passes through the first part 311 of the conductive terminal 31 and the curved section 232 of the busbar 23 and then is screwed with the first screw hole 241 to clamp and fix the first part 311 and the curved section 232 between the limiting head 321 and the fixing seat 24. In other embodiments, the fixing seat 24 is provided with a first buckle, and the first locking member 32 is provided with a second buckle, and the first buckle and the second buckle are buckled and connected.

[0037] In the structure of the energy storage device 100 in the prior art that connects the electronic control component 20 and the conductive terminal 31 through a thick cable, it is necessary to first install the positive cable and the negative cable with the electronic control component 20, and then install the electronic control component 20 and the battery assembly inside the shell 10. In this process, since the positive cable and the negative cable have a certain length and flexibility, the ends of the positive cable and the negative cable are prone to direct contact and short circuit during installation, causing harm.

[0038] See also Figure 2The energy storage device 100 of the embodiment of the present application fixes the curved section 232 of the busbar 23 on the bracket 21 by setting a fixing seat 24, thereby fixing the curved section 232 of the busbar 23 on the first side wall 121. In this way, during the assembly of the energy storage device 100, the busbar 23 is fixed and not easily deformed, and it is almost impossible for the positive busbar 23 and the negative busbar 23 to directly contact each other, which effectively improves the safety of assembly. After the battery assembly and the electronic control assembly 20 are installed in the first receiving cavity 11 of the shell 10, under the fixing action of the fixing seat 24, the curved section 232 of the busbar 23 remains fixed to the first side wall 121, which is conducive to the subsequent installation of the terminal assembly 30 on the outside of the shell 10, so that the conductive terminal 31 can be directly connected and fixed to the curved section 232 without the need for external force to clamp the curved section 232 of the busbar 23, effectively improving the convenience of installation. In addition, during the use of the energy storage device 100, the conductive terminal 31 may be worn, and the first locking member 32 and the fixing seat 24 are connected in a detachable manner, so that the conductive terminal 31 can be directly removed from the outside of the shell 10 and a new conductive terminal 31 can be installed. There is no need to disassemble the shell 10 to expose the first receiving cavity 11, thereby improving the convenience of maintenance.

[0039] See also Figure 3 and Figure 4 In some embodiments, the energy storage device 100 further includes a terminal base 34, which is disposed on the side of the first side wall 121 away from the first receiving cavity 11. The terminal base 34 has a mounting portion 341, which is penetrated through the first through hole 122, and the mounting portion 341 is provided with a second through hole 342, which is used for the first locking member 32 and a part of the conductive terminal 31 to pass through. The contour of the first through hole 122 on the first side wall 121 is larger than the contour of the second through hole 342 on the mounting portion 341, so that the first side wall 121 can also pass through other structures, such as a temperature measuring component, a monitoring component, a communication component, etc., and the second through hole 342 with a smaller aperture is provided, which is conducive to improving the sealing between the terminal assembly 30 and the housing 10.

[0040] See also Figure 5The conductive terminal 31 is electrically connected to the busbar 23 in the electric control component 20 from the side of the terminal base 34 away from the first side wall 121, and a part of the busbar 23 of the electric control component 20 is penetrated in the second through hole 342, and / or a part of the conductive terminal 31 is penetrated in the second through hole 342. Along the thickness direction of the first side wall 121, the second through hole 342 has a certain depth. Therefore, by setting a part of the busbar 23 to penetrate in the second through hole 342, or setting a part of the conductive terminal 31 to penetrate in the second through hole 342, or setting a part of the busbar 23 and a part of the conductive terminal 31 to penetrate in the second through hole 342 at the same time, it is beneficial to fill the depth of the second through hole 342, so that the conductive terminal 31 and the busbar 23 can be directly contacted and electrically connected, increase the contact area, and improve the current transmission efficiency.

[0041] In some embodiments, the structure of adding the terminal base 34 to the outside of the housing 10 can make the material of the housing 10 different from the material of the terminal base 34. For example, the housing 10 is made of metal to increase the structural strength, and the terminal base 34 is made of plastic to increase the insulation effect between the conductive terminal 31 and the housing 10 and reduce the production cost. Of course, in other embodiments, the housing 10 and the terminal base 34 can be made of the same material.

[0042] In some embodiments, see Figure 3 , the first sealing member 33 is arranged around the first through hole 122, and the first sealing member 33 is arranged between the first side wall 121 and the terminal base 34 to seal the gap between the terminal base 34 and the first side wall 121. Along the thickness direction of the first side wall 121, the first contour of the conductive terminal 31 is located outside the second contour of the second through hole 342, that is, the size of the conductive terminal 31 is larger than the size of the second through hole 342. In the thickness direction of the first side wall 121, a part of the mounting portion 341 has a blocking and limiting effect on the conductive terminal 31. At the same time, after the conductive terminal 31 is connected to the busbar 23, the conductive terminal 31 also has a clamping and fixing effect on the mounting portion 341. The terminal assembly 30 includes a second sealing member 35, which is arranged around the second through hole 342 and between the mounting portion 341 and the conductive terminal 31. The second sealing member 35 is used to seal the gap between the mounting portion 341 and the conductive terminal 31.

[0043] In some embodiments, see Figure 3The conductive terminal 31 includes a first portion 311 and a second portion 312, the first portion 311 and the second portion 312 are bent and connected, the first locking member 32 connects the busbar 23 of the electric control assembly 20 and the first portion 311, and the second portion 312 extends in a direction away from the first receiving cavity 11. As an example, the conductive terminal 31 is generally L-shaped, the plane where the first portion 311 is located is generally parallel to the plane where the first side wall 121 is located, and the plane where the second portion 312 is located is generally perpendicular to the plane where the first side wall 121 is located. Through the above structure, the first portion 311 has enough space for the first locking member 32 to pass through. When the first locking member 32 is fixedly connected to the fixing seat 24, the first portion 311, the terminal base 34 and the bent portion are clamped between the first locking portion and the fixing seat 24. The second portion 312 extends in a direction away from the receiving cavity, which is beneficial to the assembly process. The second portion 312 is held or clamped by the user to install the conductive terminal 31 on the terminal base 34, thereby improving the convenience of installation. In some embodiments, the first portion 311 and the second portion 312 of the conductive terminal 31 are integrally formed structures, and the first portion 311 and the second portion 312 can be obtained by directly manufacturing an L-shaped structure, or by partially bending a straight plate-shaped conductive terminal 31. In some embodiments, a round hole design can also be provided at the end of the second portion 312 of the conductive terminal 31 to facilitate connection with an external locking wire.

[0044] In some embodiments, see Figure 4 and Figure 5 , the mounting portion 341 is recessed toward the first receiving cavity 11 to form a second receiving cavity 343, and a part of the mounting portion 341 is located in the first receiving cavity 11. The bottom of the second receiving cavity 343 is provided with the above-mentioned second through hole 342, and the second sealing member 35 abuts between the bottom of the second receiving cavity 343 and the first part 311 of the conductive terminal 31 to seal the gap between the first part 311 and the bottom of the second receiving cavity 343 to improve the sealing performance. In some embodiments, the first sealing member 33 and the second sealing member 35 can both be silicone sealing rings. Compared with the prior art that seals the gap between the terminal and the housing 10 by later gluing, the energy storage device 100 of the embodiment of the present application uses a silicone sealing ring for sealing, which is more regular and beautiful, and the sealing cost is reduced. At the same time, the sealing effect of the rubber sealing ring is better, the sealing performance is improved, and the service life of the silicone sealing ring is longer, which improves the reliability of the energy storage device 100.

[0045] The terminal assembly 30 includes an end cap 36, which is connected to the terminal base 34 to cover the opening of the second receiving cavity 343. The end cap 36 is provided with a third through hole 361, and the second part 312 of the conductive terminal 31 passes through the third through hole 361. The end cap 36 has a supporting and fixing function for the second part 312, reducing the shaking amplitude of the second part 312 during use. In addition, the first locking member 32 is located in the second receiving cavity 343, and the end cap 36 can cover the first locking member 32 to avoid exposure of the first locking member 32, thereby improving the aesthetics of the energy storage device 100. Furthermore, the end cap 36 covers the opening of the second receiving cavity 343, which also helps to reduce the entry of external debris and moisture into the second receiving cavity 343, which is conducive to improving the sealing performance.

[0046] In some embodiments, see Figure 6 and Figure 7 The energy storage device 100 includes a first connector 40, which is connected to the first part 311 of the conductive terminal 31 on one side close to the first receiving cavity 11 to form a whole. At least a part of the first connector 40 is located in the second through hole 342, and the first connector 40 abuts against the busbar 23. The depth of the second through hole 342 is filled by the first connector 40, so that the conductive terminal 31 and the busbar 23 can be directly abutted and connected. Adding the first connector 40 is conducive to reducing the manufacturing difficulty of the conductive terminal 31 and the busbar 23. Specifically, the first part 311 of the conductive terminal 31 can be made into a flat plate, and the busbar 23 can be directly bent from a straight plate to form a straight section and a curved section 232, so that the first part 311 and the curved section 232 do not need to manufacture a convex portion to fill the depth between the first through hole 122 and the second through hole 342. It can be understood that the first connecting member 40 is conductive, and the first connecting member 40 and the conductive terminal 31 are two independent parts connected into a whole by any means such as bonding, riveting, and clamping. Compared with the solution of directly processing a convex portion on the first part 311, the method of splicing the first connecting member 40 and the conductive terminal 31 in this embodiment is simpler, reducing the difficulty of manufacturing and processing.

[0047] In some embodiments, see Figure 8, the energy storage device 100 includes a second connector 50, the second connector 50 is connected to the side of the busbar 23 away from the first receiving cavity 11 to form an integral body, at least a part of the second connector 50 is located in the second through hole 342, the second connector 50 is in contact with the conductive terminal 31, or the second connector 50 is in contact with the first connector 40. The function of the second connector 50 is the same as that of the first connector 40, and the details can be referred to the above embodiment. Similarly, compared with the solution of directly processing a convex portion on the curved section 232 of the busbar 23, the method of splicing the second connector 50 with the curved section 232 in this embodiment is simpler, reducing the difficulty of manufacturing and processing. It can be understood that in some embodiments, only the first connector 40 is spliced ​​with the first part 311, or only the second connector 50 is spliced ​​with the curved section 232, or the first connector 40 is spliced ​​with the first part 311, and the second connector 50 is spliced ​​with the curved section 232. The first connecting member 40 abuts against the second connecting member 50 to jointly fill the depth of the second through hole 342 .

[0048] In some embodiments, see Figure 1 There are two terminal assemblies 30 , and the two terminal assemblies 30 have the same structure and are both electrically connected to the electronic control assembly 20 . One terminal assembly 30 constitutes the positive electrode of the energy storage device 100 , and the other terminal assembly 30 constitutes the negative electrode of the energy storage device 100 .

[0049] See also Fig. 9 The present application further provides an energy storage system embodiment, the energy storage system includes a controller mainboard, a buck-boost device, an inverter and the above energy storage device. The controller mainboard is connected to the energy storage device through the buck-boost device, the energy storage device is connected to the inverter, the energy storage device is used to connect to an external AC load through the inverter, or the energy storage device is used to directly connect to an external DC load.

[0050] In some embodiments, the energy storage system further includes a first relay K1 and a second relay K2, wherein the first relay K1 connects the buck-boost and the energy storage device, and the first relay K1 is electrically connected to the controller mainboard. The second relay K2 connects the energy storage device and the inverter, and the second relay K2 is electrically connected to the controller mainboard. When the buck-boost receives the control signal of the controller mainboard, the energy storage device is charged through the matching voltage of the first relay K1, and the first relay K1 is disconnected when fully charged; the energy storage device is sent to the inverter through the second relay K2 to supply power to the AC load, and / or the energy storage device directly supplies power to the DC load through the second relay K2. The second relay K2 is disconnected when the energy storage device is undervoltage.

[0051] In some embodiments, the energy storage system further includes a display panel, which is electrically connected to the controller mainboard by signals, and is used to display control parameters of the controller mainboard.

[0052] The specific structure and function of the energy storage device 100 may refer to any of the above embodiments, which will not be described in detail here.

[0053] The energy storage device 100 of the embodiment of the present application is directly connected to the terminal assembly 30 through the electric control assembly 20, which reduces the space occupied between the electric control assembly 20 and the terminal assembly 30, thereby helping to reduce the overall volume of the energy storage device 100. The housing 10 adopts a sheet metal design, which improves the reliability and structural strength of the product. At the same time, the first seal 33 and the second seal 35 are both made of silicone material, which respectively seal the housing 10 and the terminal base 34, and seal the conductive terminal 31 and the terminal base 34. This design makes the sealing structure more regular, improves the sealing performance, and extends the service life of the product. In addition, the busbar 23 uses a copper busbar as a busbar to connect the circuit board 22 and the conductive terminal 31. The busbar 23 occupies a smaller space, and the copper busbar has good conductivity and heat dissipation performance, which helps to improve the transmission efficiency of the current and improve the safety and reliability of the energy storage device 100; the busbar 23 is fixed relative to the first side wall 121 of the housing 10 by the fixing seat 24, which simplifies the installation and replacement process of the conductive terminal 31 and improves the convenience of assembly.

[0054] The energy storage device 100 of the embodiment of the present application is directly connected to the terminal assembly 30 through the electric control assembly 20, which reduces the space between the electric control assembly 20 and the terminal assembly 30, and is conducive to reducing the overall volume of the energy storage device 100; the shell 10 adopts a sheet metal design, which helps to improve the reliability and structural strength of the product; the first seal 33 made of silicone is used to seal the shell 10 and the terminal base 34, and the second seal 35 made of silicone is used to seal the conductive terminal 31 and the terminal base 34, which is more regular and has better sealing performance and longer service life; a copper busbar is used as a busbar 23 to connect the circuit board 22 and the conductive terminal 31. The busbar 23 occupies less space, and the copper busbar has good conductivity and heat dissipation performance, which helps to improve the current transmission efficiency and improve the safety and reliability of the energy storage device 100; the busbar 23 is fixed relative to the first side wall 121 by the fixing seat 24, which is conducive to directly installing and replacing the conductive terminal 31 from the outside of the shell 10, thereby improving the assembly convenience.

[0055] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An energy storage device, characterized in that: include: A shell body, provided with a first receiving cavity, the shell body comprising a first side wall, the first side wall being provided with a first through hole, the first through hole being in communication with the first receiving cavity and the outside; An electric control component is arranged in the first receiving cavity; the electric control component comprises a bracket, a circuit board and a busbar, the bracket is fixed to the housing, the circuit board is fixed to the bracket, the busbar is electrically connected to the circuit board, and a part of the busbar is arranged corresponding to the first through hole; A terminal assembly is detachably arranged outside the first receiving cavity, and the terminal assembly includes a conductive terminal, a first locking piece and a first sealing piece. The first sealing piece is arranged between the shell and the conductive terminal, a part of the first locking piece is penetrated through the first through hole, and the busbar is connected to the first locking piece and / or the conductive terminal, and the conductive terminal is electrically connected to the busbar.

2. The energy storage device according to claim 1, characterized in that: The energy storage device includes a terminal base, which is fixed to the side of the first side wall away from the first accommodating cavity, and the terminal base has a mounting portion, which is penetrated by the first through hole, and the mounting portion is provided with a second through hole, the conductive terminal is electrically connected to the busbar from the side of the terminal base away from the first side wall, the busbar is partially penetrated by the second through hole, and / or the conductive terminal is partially penetrated by the second through hole.

3. The energy storage device according to claim 2, characterized in that: The first sealing member is disposed around the first through hole, and the first sealing member is disposed between the first side wall and the terminal base; Along the thickness direction of the first side wall, the first contour of the conductive terminal projection is located outside the second contour of the second through hole projection, and the terminal assembly includes a second seal, which is arranged around the second through hole and between the terminal base and the conductive terminal.

4. The energy storage device according to claim 3, characterized in that: The conductive terminal includes a first portion and a second portion, the first portion and the second portion are bent and connected, the first locking member connects the busbar and the first portion, and the second portion extends in a direction away from the first receiving cavity.

5. The energy storage device according to claim 4, characterized in that: The mounting portion is recessed toward the first receiving cavity to form a second receiving cavity, a portion of the mounting portion is located in the first receiving cavity, a cavity bottom of the second receiving cavity is provided with the second through hole, and the second sealing member abuts against the cavity bottom of the second receiving cavity and the first portion; The terminal assembly includes an end cover, which is connected to the terminal base to cover the cavity opening of the second accommodating cavity. The end cover is provided with a third through hole, and the second part passes through the third through hole.

6. The energy storage device according to claim 4, characterized in that: The busbar comprises a main body section and a bent section connected to each other, the main body section is electrically connected to the circuit board, and the bent section is bent toward the first side wall; The electric control component includes a fixing seat, the fixing seat is fixedly connected to the bracket, and the fixing seat fixes the bending section to the mounting portion, and the first locking member is detachably connected to the fixing seat.

7. The energy storage device according to claim 6, characterized in that: The first locking member includes a limiting head and a body, the body is provided with a first thread, the fixing seat is provided with a first screw hole, the first locking member passes through the first part and the bending section and is screwed to the first screw hole, and the first part and the bending section are located between the limiting head and the fixing seat.

8. The energy storage device according to claim 4, characterized in that: The energy storage device includes a first connecting member, the first connecting member is connected to the first portion to form a whole, at least a part of the first connecting member is located in the second through hole, and the first connecting member abuts against the busbar.

9. The energy storage device according to claim 8, characterized in that: The energy storage device includes a second connector, which is connected to the busbar to form a whole, at least part of the second connector is located in the second through hole, the second connector abuts against the conductive terminal, and / or the second connector abuts against the first connector.

10. An energy storage system, characterized in that: It comprises a controller mainboard, a buck-boost converter, an inverter and an energy storage device as claimed in any one of claims 1 to 9; The controller mainboard is connected to the energy storage device through the buck-boost device, the energy storage device is connected to the inverter, and the energy storage device is used to connect to an external AC load through the inverter, or the energy storage device is used to directly connect to an external DC load.

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