Energy storage battery module

Abstract

The invention provides an energy storage battery module, which comprises: a shell, the shell comprises a base and a cover plate, the base and the cover plate enclose to form a mounting cavity, and two sides of the cover plate are provided with a plurality of heat dissipation ports communicated with the mounting cavity; and the battery assembly comprises a supporting piece and battery cell units, the supporting piece is provided with a plurality of accommodating cavities arranged side by side, each accommodating cavity is internally provided with at least one battery cell unit, the two sides of each battery cell unit are both provided with a plurality of cooling fins, and the cooling fins are arranged in a connected mode and correspond to the cooling openings. The energy storage battery module provided by the invention aims to solve the problem of non-uniform heat dissipation effect of the battery in the prior art.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to an energy storage battery module. Background Technology

[0002] Energy storage batteries generate a significant amount of heat during charging and discharging. Inadequate thermal management design of the energy storage enclosure during prolonged or high-rate operation can easily lead to thermal runaway. This not only affects battery performance and lifespan but can also cause safety accidents. Existing energy storage battery enclosures employ two cooling methods: air cooling and liquid cooling. Air cooling is less expensive but less effective, while liquid cooling is the opposite. Regardless of the cooling method, the approach typically involves maximizing the available heat dissipation surface of the battery cell for heat exchange or forced cooling. However, in actual operation, high temperatures often occur not only at the center of the cell but also at the positive and negative terminals. Current energy storage battery enclosure designs often only address heat dissipation at the cell body, neglecting the heat dissipation design at the terminals. This necessitates additional costs to ensure that the temperature rise and temperature consistency of all cells within the energy storage battery enclosure meet requirements. Summary of the Invention

[0003] This invention provides an energy storage battery module designed to solve the problem of uneven heat dissipation in batteries in traditional technologies.

[0004] To address the problems existing in the prior art, embodiments of the present invention provide an energy storage battery module, comprising: A housing, comprising a base and a cover plate, the base and the cover plate forming a mounting cavity, and the cover plate having multiple heat dissipation vents communicating with the mounting cavity on both sides; and...

[0005] A battery assembly includes a support member and battery cell units. The support member has multiple accommodating cavities arranged side by side. Each accommodating cavity contains at least one battery cell unit. Each battery cell unit has multiple heat sinks on both sides. The heat sinks are connected to each other and correspond to each heat dissipation port.

[0006] According to an energy storage battery module provided by the present invention, the support member includes two support end plates, a middle bracket and a top mounting plate. The two support end plates and the middle bracket respectively enclose a plurality of receiving cavities. The top mounting plate covers the ends of the support end plates and the middle bracket. The two ends of the top mounting plate are detachably connected to the support end plates respectively.

[0007] According to an energy storage battery module provided by the present invention, the top mounting plate has protrusions on both sides, a positioning rib on one side of the protrusion, a mounting groove is formed on the end face of the support end plate, a positioning groove is formed on the side wall of the mounting groove, a through hole is formed on the end face of the support end plate, the protrusion is disposed in the mounting groove and the positioning rib cooperates with the positioning groove, a connecting bolt is also inserted in the through hole, and the connecting bolt passes through the through hole and is connected to the base.

[0008] According to the present invention, an energy storage battery module is provided in each of the accommodating cavities, and the support member further includes a strap. The support end plate and the intermediate bracket are provided with strap grooves on both sides. The straps are provided in each of the strap grooves and their two ends are detachably connected to the support end plate.

[0009] According to an energy storage battery module provided by the present invention, the cell unit includes two aluminum sheets, multiple cells and multiple thermally conductive pads. The two aluminum sheets are enclosed to form a cavity. Each cell and each thermally conductive pad are alternately disposed in the cavity. Each aluminum sheet has a connecting plate on both sides. Two adjacent connecting plates are detachably connected by bolts.

[0010] According to an energy storage battery module provided by the present invention, the end of the connecting plate is bent to form a heat sink, and the bending directions of two adjacent heat sinks are opposite and they are located on the same plane.

[0011] According to an energy storage battery module provided by the present invention, the battery assembly further includes a tab thermal conductive silicone pad, the top mounting plate is provided with a plurality of positioning posts, the tab thermal conductive silicone pad is provided with a plurality of insertion holes, and the positioning posts pass through the insertion holes; The top mounting plate and the electrode thermal conductive silicone pad are provided with multiple slots, and the electrodes of each battery cell pass through each of the slots in sequence.

[0012] According to an energy storage battery module provided by the present invention, the two sides of the electrode thermal conductive silicone pad extend to form bent sections, and the bent sections are fitted to each of the heat sinks.

[0013] According to an energy storage battery module provided by the present invention, the battery assembly further includes a current-passing component, the current-passing component is disposed on the electrode tab thermal conductive silicone pad, the current-passing component includes a plurality of connecting pieces, each of the connecting pieces is provided with the insertion hole, and the positioning post passes through the insertion hole; The connecting piece also has the slot, and the electrode passes through the slot and is welded to the connecting piece.

[0014] According to an energy storage battery module provided by the present invention, the battery assembly further includes a positive busbar and a negative busbar. One end of the positive busbar and the negative busbar are connected to the connecting piece, and the other end is connected to the positive power plug and the negative power plug. The positive power plug and the negative power plug are disposed on one side of the cover plate, and a communication plug is also provided on one side of the cover plate.

[0015] The energy storage battery module provided by this invention comprises multiple battery cell units, which are stably supported by a support structure. Furthermore, a heat dissipation vent is provided on the cover plate, and heat sinks on the battery cell units are connected to form a large heat dissipation plane. The heat sinks correspond to the heat dissipation vents, achieving a strong heat dissipation effect with a simple structure. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the energy storage battery module provided by the present invention; Figure 2 This is a schematic diagram of the disassembly structure of the energy storage battery module provided by the present invention; Figure 3 This is a schematic diagram of the battery assembly provided by the present invention; Figure 4 This is a schematic diagram of the disassembled structure of the battery assembly provided by the present invention; Figure 5 This is a partial structural schematic diagram of the battery assembly provided by the present invention; Figure 6 This is a schematic diagram of the battery cell unit provided by the present invention; Figure 7 This is a schematic diagram of the structure of the support end plate provided by the present invention; Figure 8 This is a schematic diagram of the structure of the intermediate support provided by the present invention; Figure 9 This is a schematic diagram of the structure of the top mounting plate provided by the present invention; Figure 10 This is a schematic diagram of the structure of the electrode tab thermal conductive silicone pad provided by the present invention; Figure 11 This is a schematic diagram of the connecting piece provided by the present invention.

[0018] Figure label: 10: Housing; 11: Base; 12: Cover plate; 121: Front plate; 122: Cover plate body; 123: Heat dissipation vent; 13: Electrical mounting plate; 14: Mounting cavity; 20: Battery assembly; 21: Support component; 211: Support end plate; 2111: Mounting groove; 2112: Positioning groove; 2113: Through hole; 2114: Strap groove; 212: Intermediate bracket; 213: Top mounting plate; 2131: Protrusion; 2132: Positioning rib; 2133: Positioning post; 2134: Receiving groove; 214: 22: Housing cavity; 221: Aluminum sheet; 222: Battery cell; 223: Thermal pad; 224: Connecting plate; 225: Heat sink; 226: Cavity; 23: Foam; 24: Strap; 25: Terminal tab thermal pad; 251: Socket; 252: Slot; 253: Bending section; 26: Current-carrying component; 261: Connecting piece; 27: Positive busbar; 28: Negative busbar; 30: Positive power connector; 40: Negative power connector; 50: Communication connector; 60: Battery management module. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0020] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0021] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0024] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. Additionally, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0025] The following is combined with Figures 1-11 This invention describes the energy storage battery module provided by the present invention.

[0026] To address the problems existing in the prior art, this invention provides an energy storage battery module, including a housing 10 and a battery assembly 20.

[0027] The housing 10 includes a base 11 and a cover plate 12, which together form a mounting cavity 14. In an optional embodiment, the base 11 includes a bottom plate and reinforcing ribs disposed around the bottom plate, which can limit the wall surface of the battery assembly 20 to a certain extent. The cover plate 12 can be shell-shaped and directly cover the base 11, or it can be split, for example, composed of multiple side plates and a top plate connected together. In one embodiment provided by the present invention, the cover plate 12 includes a front plate 121 and a cover plate body 122. The front plate 121 is used to install some electrical components. The cover plate body 122 is bent, and multiple heat dissipation vents 123 communicating with the mounting cavity 14 are opened on both sides of the cover plate body 122. The heat dissipation vents 123 are strip-shaped and aligned with the height extension direction of the battery assembly 20.

[0028] The battery module 20 includes a support member 21 and battery cell units 22. The support member 21 has multiple accommodating cavities 214 arranged side by side, each cavity 214 containing at least one battery cell unit 22. Multiple heat sinks 225 are provided on both sides of each battery cell unit 22, with each heat sink 225 connected and corresponding to a heat dissipation port 123. It should be noted that the energy storage battery module provided by this invention, the battery module 20, is composed of multiple battery cell units 22, and the support member 21 provides stable support for the battery cell units 22. Furthermore, the cover plate 12 is provided with heat dissipation ports 123, and the heat sinks 225 on the battery cell units 22 contact each other to form a large-area heat dissipation plane. The heat sinks 225 correspond to the heat dissipation ports 123, achieving a strong heat conduction and dissipation effect for the battery cell 222 with a simple structure.

[0029] Specifically, please refer to Figures 1-4 as well as Figures 7-9 The support member 21 includes two support end plates 211, multiple intermediate supports 212, and a top mounting plate 213. The two support end plates 211 and the multiple intermediate supports 212 respectively enclose multiple receiving cavities 214. The top mounting plate 213 covers the ends of the support end plates 211 and the intermediate supports 212. For easy fixing, both ends of the top mounting plate 213 are detachably connected to the support end plates 211. It should be noted that the support member 21 has clearance openings on its side. The support end plates 211 and intermediate supports 212 are fixed to the battery cell unit 22 only from the front and rear end faces. The heat sinks 225 on both sides of the battery cell unit 22 are not blocked by the support member 21 and can be used for heat dissipation corresponding to the heat dissipation vents 123. To save materials, the middle part of the intermediate supports 212 can be hollowed out.

[0030] In an optional embodiment, please refer to Figures 7-9 The top mounting plate 213 has protrusions 2131 on both sides, and a positioning rib 2132 on one side of each protrusion 2131. Correspondingly, the end face of the support end plate 211 has a mounting groove 2111, the side wall of the mounting groove 2111 has a positioning groove 2112, and the end face of the support end plate 211 has a through hole 2113. During the assembly of the support member 21, the protrusions 2131 are placed in the mounting groove 2111, and the positioning rib 2132 engages with the positioning groove 2112 to ensure that the protrusions 2131 are installed in place. Furthermore, a connecting bolt is also inserted through the through hole 2113, and the connecting bolt passes through the through hole 2113 to connect with the base 11, thus completing the stable connection between the base 11 and the support member 21.

[0031] Furthermore, each receiving cavity 214 is also provided with foam 23. In an optional embodiment, each receiving cavity 214 houses a battery cell unit 22, and a foam 23 is provided on both sides of the battery cell unit 22. The support member 21 also includes straps 24, which can be steel straps 24. Strap grooves 2114 are provided on both sides of the support end plate 211 and the intermediate bracket 212. See reference Figure 7 and Figure 8 Both sides of the support end plate 211 and the intermediate bracket 212 are provided with extension plates, and the extension plates have strap grooves 2114. When the support end plate 211 and the intermediate bracket 212 are assembled, all the strap grooves 2114 are located on the same straight line, and the straps 24 can extend along each strap groove 2114. The two ends of the straps 24 can be detachably connected to the support end plate 211 by screws. The foam 23 can provide cushioning for the battery cell unit 22. By adjusting the length of the straps 24, the compression of the foam 23 can be adjusted, thereby adjusting the pre-compression force of the intermediate bracket 212 and the support end plate 211 on the battery cell unit 22. The straps 24 can be one or more, and the present invention does not limit this.

[0032] Specifically, please refer to Figure 5 and Figure 6 The battery cell unit 22 includes two aluminum sheets 221, multiple battery cells 222, and multiple thermally conductive pads 223. The two aluminum sheets 221 enclose a cavity 226, and each battery cell 222 and each thermally conductive pad 223 is alternately arranged within the cavity 226. To fix the battery cell unit 22, connecting plates 224 are provided on both sides of the aluminum sheets 221, and adjacent connecting plates 224 can be detachably connected by bolts. It should be noted that a layer of adhesive can be applied between the aluminum sheets 221, the battery cells 222, and the thermally conductive pads 223 to improve the stability of the connection, and then the two aluminum sheets 221 can be locked with bolts to ensure the stability of the entire battery cell unit 22 connection. Further, as mentioned above, heat sinks 225 are provided on both sides of the battery cell unit 22. In the embodiment provided by the present invention, the ends of the connecting plates 224 are bent to form heat sinks 225, and the bending directions of adjacent heat sinks 225 are opposite and located on the same plane. Thus, when the battery cell unit 22 is mounted on the support member 21, the heat sinks 225 of two adjacent battery cell units 22 come into contact in sequence, forming a large-area heat dissipation plane, which is beneficial to improving heat dissipation efficiency. In summary, the support member 21 and the battery cell unit 22 can provide good mechanical support on the one hand, and good heat conduction and dissipation on the other hand.

[0033] During actual operation of the battery cell, high temperatures will occur not only in the center of the cell body but also at the positive and negative terminals. For further details, please refer to [link to relevant documentation]. Figure 10In the technical solution provided by this invention, the battery assembly 20 further includes a tab thermal conductive silicone pad 25. A top mounting plate 213 has multiple positioning posts 2133, and the tab thermal conductive silicone pad 25 has multiple insertion holes 251. The tab thermal conductive silicone pad 25 is disposed on the top mounting plate 213, and the positioning posts 2133 pass through the insertion holes 251, completing the initial positioning of the top mounting plate 213 and the tab thermal conductive silicone pad 25. Furthermore, the top mounting plate 213 and the tab thermal conductive silicone pad 25 have corresponding slots 252, and the tabs of each cell 222 pass through each slot 252 in sequence. When the tabs pass through the slots 252, they come into contact with the tab thermal conductive silicone pad 25, and heat can be transferred to the tab thermal conductive silicone pad 25 and dissipated by the tab thermal conductive silicone pad 25.

[0034] As mentioned earlier, large heat dissipation planes are formed on both sides of the battery cell unit 22. To improve heat dissipation, the thermal conductive silicone pads 25 on both sides extend to form bent sections 253, which are attached to each heat sink 225. It should be noted that the bent sections 253 can partially contact the heat sink 225, but do not completely cover it. Ideally, the bent sections 253 should contact all the heat sinks 225 to improve heat dissipation efficiency. The bent sections 253 and the heat sinks 225 can be bonded together.

[0035] Furthermore, the battery assembly 20 also includes a current-carrying component 26, which is disposed on the thermally conductive silicone pad 25 of the electrode tab. The current-carrying component 26 includes multiple connecting pieces 261, each of which has an insertion hole 251. A positioning post 2133 passes through the insertion hole 251 to complete the positioning and installation of the current-carrying component 26 on the thermally conductive silicone pad 25 of the electrode tab. Furthermore, the connecting piece 261 also has a slot 252, through which the electrode tab passes and is soldered to the connecting piece 261. Please refer to [link / reference]. Figure 11 This invention provides several configurations of the connecting piece 261. Any configuration of the connecting piece 261 can be selected based on the distribution of the tabs, and this invention does not limit this configuration. Each connecting piece 261 includes two sets of slots 252. In one set of slots 252, the tabs are welded to the connecting piece 261 in parallel, and the tabs in the two sets of slots 252 are then connected in series.

[0036] It should be noted that there are two heat dissipation paths inside the module. The first heat dissipation path is cell 222 - cell tab - connecting piece 261 - tab thermal pad 25 - heat sink 225. The second heat dissipation path is cell 222 - thermal pad 223 - aluminum sheet 221 - heat sink 225. The heat of the module is collected in the heat sink 225. External cold air is blown in from the heat dissipation port 123 opposite to the heat sink 225. The cold air from top to bottom in the module passes through the surface of the tab thermal pad 25 and the heat sink 225 in sequence, forcibly carrying away the heat.

[0037] Furthermore, the battery assembly 20 also includes a positive busbar 27 and a negative busbar 28. One end of the positive busbar 27 and the negative busbar 28 is connected to the connecting piece 261, and the other end is connected to the positive power plug 30 and the negative power plug 40. The positive power plug 30 and the negative power plug 40 are located on one side of the cover plate 12 and on the front plate 121. The front plate 121 is also provided with a communication plug 50. It should be noted that the positive busbar 27 and the negative busbar 28 are bent, and some of the connecting pieces 261 are also bent. One end of the positive busbar 27 and the negative busbar 28 is in contact with the bent connecting piece 261. Both are provided with screw holes. The protrusion 2131 of the top mounting plate 213 is also provided with a receiving groove 2134. A nut is provided in the receiving groove 2134. The bolt can be threaded through the screw holes of both and then connected to the nut on the top mounting plate 213 to complete the fixation. The other end of the positive busbar 27 and the negative busbar 28 are connected to the positive power plug 30 and the negative power plug 40.

[0038] Furthermore, an electrical mounting plate 13 is provided between the front end face of the battery module 20 and the front plate 121 of the cover plate 12. The electrical mounting plate 13 is welded to the center of the inner side of the front plate 121. The battery management module 60 is mounted on the electrical mounting plate 13 by screws. The temperature and pressure sampling harness interface of the battery management module 60 faces upward, and the communication power interface faces downward. It is connected to the communication plug-in 50 through the adapter harness. Adjacent energy storage battery modules in the cluster can achieve communication series through the communication plug-in 50.

[0039] The energy storage battery module provided by this invention has the following advantages: 1. Two heat dissipation paths are formed within the module, which can conduct heat and dissipate heat from multiple directions to the hot spots that are prone to accumulate in the soft-pack battery cells; 2. The module consists of multiple battery cell units 22, which can provide both mechanical support and heat dissipation for the battery cells through a simple structure; 3. The module contains elastic components such as foam 23 and thermal pad 223, which can also adjust the different size differences caused by the expansion of the soft-pack battery cell during charging and the reduction of the battery cell during discharging in the fully charged and empty states. 4. By adopting air cooling, the problem of insufficient heat dissipation capacity of existing energy storage batteries can be solved with relatively low additional costs.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An energy storage battery module, characterized in that, include: The housing includes a base and a cover plate, the base and the cover plate forming an installation cavity, and the cover plate has multiple heat dissipation vents on both sides communicating with the installation cavity; as well as, A battery assembly includes a support member and battery cell units. The support member has multiple accommodating cavities arranged side by side. Each accommodating cavity contains at least one battery cell unit. Each battery cell unit has multiple heat sinks on both sides. The heat sinks are connected to each other and correspond to each heat dissipation port.

2. The energy storage battery module according to claim 1, characterized in that, The support includes two support end plates, a middle bracket, and a top mounting plate. The two support end plates and the middle bracket respectively enclose a plurality of receiving cavities. The top mounting plate covers the ends of the support end plates and the middle bracket. The two ends of the top mounting plate are detachably connected to the support end plates respectively.

3. The energy storage battery module according to claim 2, characterized in that, The top mounting plate has protrusions on both sides, and a positioning rib on one side of the protrusion. The end face of the support end plate has a mounting groove, and the side wall of the mounting groove has a positioning groove. The end face of the support end plate has a through hole. The protrusion is located in the mounting groove, and the positioning rib cooperates with the positioning groove. A connecting bolt is also inserted in the through hole, and the connecting bolt passes through the through hole and is connected to the base.

4. The energy storage battery module according to claim 2, characterized in that, Each of the accommodating cavities is also provided with foam, and the support member also includes straps. Both sides of the support end plate and the intermediate bracket are provided with strap grooves. The straps are located in each of the strap grooves and their two ends are detachably connected to the support end plate.

5. The energy storage battery module according to claim 1, characterized in that, The battery cell unit includes two aluminum sheets, multiple battery cells, and multiple thermally conductive pads. The two aluminum sheets are enclosed to form a cavity. Each battery cell and each thermally conductive pad are alternately arranged in the cavity. Each aluminum sheet has a connecting plate on both sides. Two adjacent connecting plates are detachably connected by bolts.

6. The energy storage battery module according to claim 5, characterized in that, The end of the connecting plate is bent to form a heat sink, and the bending directions of two adjacent heat sinks are opposite and they are located on the same plane.

7. The energy storage battery module according to claim 2, characterized in that, The battery assembly also includes a tab thermal conductive silicone pad, the top mounting plate is provided with a plurality of positioning posts, the tab thermal conductive silicone pad is provided with a plurality of insertion holes, and the positioning posts pass through the insertion holes; The top mounting plate and the electrode thermal conductive silicone pad are provided with multiple slots, and the electrodes of each battery cell pass through each of the slots in sequence.

8. The energy storage battery module according to claim 7, characterized in that, The two sides of the electrode thermal conductive silicone pad extend to form bent sections, which are fitted to each of the heat sinks.

9. The energy storage battery module according to claim 7, characterized in that, The battery assembly also includes a current-passing component, which is disposed on the thermally conductive silicone pad of the electrode tab. The current-passing component includes multiple connecting pieces, each of which has an insertion hole, and the positioning post passes through the insertion hole. The connecting piece also has the slot, and the electrode passes through the slot and is welded to the connecting piece.

10. The energy storage battery module according to claim 9, characterized in that, The battery assembly also includes a positive busbar and a negative busbar. One end of the positive busbar and the negative busbar are connected to the connecting piece, and the other end is connected to the positive power plug and the negative power plug. The positive power plug and the negative power plug are located on one side of the cover plate, and a communication plug is also provided on one side of the cover plate.

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