Single-phase power module

Abstract

The utility model belongs to the technical field of high-voltage frequency converters, and discloses a single-phase power module. The single-phase power module comprises a protective shell, an IGCT valve string module and a cooling module, the IGCT valve string module comprises a mounting frame and a valve string, the valve string is divided into at least two sections of crimping valve strings, the crimping valve strings are connected with the mounting frame, each section of crimping valve string extends along a first direction, and the at least two sections of crimping valve strings are arranged at intervals along a second direction; an opening is formed in at least one side of the protective shell, and the IGCT valve string module is arranged on the protective shell; the cooling module is arranged on the first bottom plate, and the water cooling radiator of the crimping valve string is communicated with the cooling module. According to the shell, under the condition that the valve string is installed, the occupied installation area of the bottom of the shell is reduced, the internal structure is compact, and the utilization rate of the internal space of the shell is high.

Description

Technical Field

[0001] This utility model relates to the field of high voltage frequency converter technology, and in particular to a single-phase power module. Background Technology

[0002] In the field of power electronics technology, high-voltage frequency converters, as a key power electronic device, undertake the important task of regulating the speed and torque of high-voltage motors (whose voltage levels typically cover 3kV, 6kV, 10kV and higher). Due to their superior performance, these devices are widely used in various industrial sectors such as power, metallurgy, mining, petrochemicals, and water treatment, becoming an indispensable part of modern industrial automation and energy conservation and emission reduction.

[0003] Since the successful application of Integrated Gate-Commutated Thyristor (IGCT) technology in converter devices in 1997, this technology has achieved breakthroughs in multiple dimensions, including power, reliability, efficiency, and cost, thanks to its unique advantages. The continuous maturation and optimization of IGCT technology has not only propelled the overall leap forward in power electronic complete equipment technology but has also made IGCT-based converter devices occupy a pivotal position in the field of power electronics. IGCT converter devices, with their high efficiency, high reliability, and flexible control characteristics, have been widely used in high-voltage and medium-voltage frequency converters. Their advantages are becoming increasingly prominent with continuous technological advancements, demonstrating enormous development potential. In the selection of components for converter devices, IGCT, with its superior electrical performance, is gradually replacing traditional thyristor power electronic switching devices, becoming the preferred solution in high-power converter devices. IGCT devices not only possess the significant advantages of low quantity and high voltage withstand capability but also greatly simplify the design and manufacturing process of converter devices, improving the overall performance and reliability of the system. Therefore, single-phase power modules based on IGCT thyristors have secured a place in the power electronics market due to their unique advantages.

[0004] However, under current technological conditions, single-phase power modules based on IGCT thyristors, diodes, and water-cooled heat sinks still face some technical challenges. Specifically, for some single-phase power modules with complex circuit topologies that require horizontal mounting, the valve string length is relatively long. After the valve string is mounted horizontally, the dimensions of the single-phase power module housing in the left-right length direction need to be increased. This design not only greatly increases the mounting area occupied at the bottom of the housing, but also makes the internal structure of the housing less compact. Utility Model Content

[0005] The purpose of this utility model is to provide a single-phase power module that, while meeting the requirements for valve string installation, not only reduces the floor space occupied at the bottom of the housing, but also makes the internal structure of the housing compact and improves the space utilization rate inside the housing.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] Single-phase power module, including:

[0008] The IGCT valve string module includes a mounting frame and a valve string, wherein the valve string is divided into at least two crimped valve strings, the crimped valve strings are connected to the mounting frame, each crimped valve string extends along a first direction, and at least two crimped valve strings are spaced apart along a second direction;

[0009] A protective housing, wherein at least one side of the protective housing has an opening, and the IGCT valve string module is disposed inside the protective housing;

[0010] A cooling module is located at the bottom of the protective housing, and the water-cooled radiator of the crimp valve string is connected to the cooling module.

[0011] As an optional solution for single-phase power modules, the mounting frame includes a second top plate, a second bottom plate, and two second side plates. The second top plate, the second bottom plate, and the two second side plates surround a second receiving cavity, and at least two sections of the crimping valve string are disposed in the second receiving cavity.

[0012] As an optional solution for the single-phase power module, the mounting frame further includes at least one partition plate, the two ends of which are respectively connected to two second side plates. The partition plate divides the second receiving cavity into several partition chambers, and each partition chamber is provided with a crimping valve string.

[0013] As an optional solution for a single-phase power module, one of the second side plates has a top bolt threaded onto its inner wall surface. The first end of the crimp valve string abuts against the top bolt, and the second end of the crimp valve string abuts against the other second side plate. The top bolt and the crimp valve string are coaxially arranged.

[0014] As an optional solution for single-phase power modules, the end face of the first end of the crimp valve string is provided with a positioning groove, and the end of the top bolt near the crimp valve string is provided with a positioning protrusion, which abuts against the bottom of the positioning groove.

[0015] As an optional solution for the single-phase power module, the single-phase power module further includes:

[0016] At least two water-cooled reactors are respectively disposed within the protective housing. The water-cooled reactors extend along the second direction, and the cooling channels of the water-cooled reactors are connected to the cooling module.

[0017] As an optional solution for a single-phase power module, the water-cooled reactor includes a connecting copper busbar, a positive copper busbar, a negative copper busbar, and two aluminum tubes with cooling channels. Several magnetic rings are fitted on the aluminum tubes. The connecting copper busbar is fitted on the first end of both aluminum tubes, and the positive copper busbar and the negative copper busbar are fitted on the second end of the two aluminum tubes, respectively.

[0018] As an optional solution for the single-phase power module, the water-cooled reactor also includes a connecting pipe, wherein the cooling channels at the second ends of the two aluminum tubes are respectively connected to the two ends of the connecting pipe.

[0019] As an optional solution for single-phase power modules, the protective housing includes a first top plate, a first bottom plate, and two first side plates. The connecting copper busbar is provided with a first connection hole, and a first fastener passes through the first connection hole and connects to the first side plate.

[0020] As an optional solution for the single-phase power module, the positive copper busbar is provided with a second connection hole, and a second fastener passes through the second connection hole to connect to the first side plate; and / or

[0021] The negative electrode copper busbar is provided with a third connection hole, and a third fastener passes through the third connection hole to connect with the first side plate.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0023] The single-phase power module provided by this utility model has an opening on at least one side of the protective housing to facilitate the installation of the IGCT valve string module and the cooling module inside the protective housing. The IGCT valve string module is housed within the protective housing, wherein the valve string of the IGCT valve string module is divided into at least two crimped valve strings extending along a first direction. These at least two crimped valve strings are spaced apart within a mounting frame along a second direction. By segmenting the valve string of the IGCT valve string module in the first direction and placing it within the mounting frame, the length of the IGCT valve string module in the first direction can be shortened without increasing the length of the protective housing in the first direction, while still meeting the valve string installation requirements. This also helps to make the internal structure of the housing more compact, improving the space utilization within the protective housing. The cooling module is located at the bottom of the protective housing, allowing the cooling channels of the water-cooled radiator to communicate with the cooling module. This facilitates the circulation of coolant within the water-cooled radiator, helping to reduce the temperature of the crimped valve string during operation and preventing the compact internal structure of the protective housing from affecting the normal heat dissipation of the crimped valve string. Attached Figure Description

[0024] Figure 1 This is an assembly diagram of the single-phase power module in an embodiment of this utility model;

[0025] Figure 2 This is a front view of a single-phase power module in an embodiment of this utility model;

[0026] Figure 3 This is a rear view of the single-phase power module in an embodiment of this utility model;

[0027] Figure 4 This is a schematic diagram of the structure of the protective shell in an embodiment of this utility model;

[0028] Figure 5 This is a schematic diagram of the structure of the IGCT valve string module in an embodiment of this utility model;

[0029] Figure 6 This is a schematic diagram of the installation frame in an embodiment of this utility model;

[0030] Figure 7 This is a schematic diagram of the structure of the water-cooled reactor in an embodiment of this utility model.

[0031] In the picture:

[0032] 1. Protective housing; 2. IGCT valve series module; 3. Water-cooled reactor; 4. Cooling module; 5. Buffer capacitor; 6. Absorption resistor; 7. DC output copper busbar; 8. AC input copper busbar; 9. Valve series water pipe;

[0033] 11. First top plate; 12. First bottom plate; 13. First side plate; 14. Handle;

[0034] 21. Mounting frame; 211. Second top plate; 212. Second bottom plate; 213. Second side plate; 214. Partition plate; 215. Top bolt; 2151. Positioning protrusion; 22. Crimping valve string; 221. Diode; 222. Water-cooled radiator; 223. IGCT device;

[0035] 31. Connecting copper busbar; 311. First connecting hole; 32. Positive copper busbar; 33. Negative copper busbar; 331. Third connecting hole; 34. Aluminum tube; 35. Magnetic ring; 36. Connecting pipe;

[0036] 41. Inlet pipe; 42. Outlet pipe. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0038] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0041] To achieve a compact internal structure and improve the utilization of internal space, this embodiment provides a single-phase power module, which is described below in conjunction with... Figures 1 to 7 The specific content of this embodiment will be described in detail. It should be noted that the first direction mentioned in this embodiment is... Figure 1 The X direction in the text refers to both the horizontal direction and the length direction; the second direction mentioned in this embodiment is... Figure 1 The Z direction in the equation refers to both the vertical direction and the height direction.

[0042] like Figures 1 to 6As shown, the single-phase power module in this embodiment includes a protective housing 1, an IGCT valve string module 2, and a cooling module 4. The protective housing 1 includes a first top plate 11, a first bottom plate 12, and two first side plates 13, which together form a first receiving cavity with an opening. The IGCT valve string module 2 is disposed within the first receiving cavity of the protective housing 1. The IGCT valve string module 2 includes a mounting frame 21 and a valve string. The valve string is divided into at least two crimped valve strings 22 extending along a first direction. The crimped valve strings 22 are connected to and crimped into the mounting frame 21. At least two crimped valve strings 22 are spaced apart within the mounting frame 21 along a second direction. The length direction of the protective housing 1 is the first direction, and the height direction is the second direction. The cooling module 4 is disposed on the first bottom plate 12, and the water-cooled radiator 222 of the crimped valve strings 22 is connected to the cooling module 4. Specifically, the cooling module 4 includes an inlet pipe 41 and an outlet pipe 42. The inlet pipe 41 is used for the inflow of coolant, and the outlet pipe 42 is used for the outflow of coolant.

[0043] The single-phase power module provided by this utility model has an open frame structure for its protective housing 1. The first receiving cavity is formed by the first top plate 11, the first bottom plate 12, and two first side plates 13. Its through-hole design (i.e., in the Y direction) overcomes the limitations of traditional closed housings. The protective housing 1 has an opening, which allows the IGCT valve string module 2 and the cooling module 4 to be assembled horizontally by pushing them in, avoiding the dependence on space height required by traditional vertical installation methods. In other application scenarios, after the IGCT valve string module 2 is pressed, it is installed onto the first bottom plate 12 of the protective housing 1, then the two first side plates 13 are installed, and finally the first top plate 11 is installed. The valve string is divided into at least two crimped valve strings 22, each extending along a first direction (e.g., horizontal) to form a linear array structure. This layout makes full use of the housing space and can shorten the length of the valve string in the IGCT valve string module 2 in the first direction. By segmenting the valve string of the IGCT valve string module in the first direction, while meeting the valve string installation requirements, it not only eliminates the need to increase the length of the protective housing 1 in the first direction, but also helps to make the internal structure of the protective housing 1 more compact, thus improving the space utilization rate inside the protective housing 1. Two adjacent crimped valve strings 22 are distributed at intervals along a second direction (e.g., vertical). With this layout, while keeping the length of the protective housing 1 unchanged, the crimped valve strings 22 are arranged along the second direction, significantly improving the space utilization rate inside the housing. The cooling module 4 is placed on the first base plate 12, so that the cooling channel of the water-cooled radiator 222 is connected to the cooling module 4, which facilitates the circulation of coolant in the water-cooled radiator 222, helps to reduce the temperature of the crimp valve string 22 when it is working, and avoids the normal heat dissipation of the crimp valve string 22 due to the compact internal structure of the protective housing 1.

[0044] Furthermore, the mounting frame 21 includes a second top plate 211, a second bottom plate 212, and two second side plates 213. The second top plate 211, the second bottom plate 212, and the two second side plates 213 enclose a second receiving cavity, within which at least two crimped valve strings 22 are disposed. The second top plate 211 and the second bottom plate 212 serve as upper and lower boundaries, while the two second side plates 213 act as left and right barriers, forming an independent space to prevent external interference (such as dust or liquid intrusion) from affecting the internal valve strings. The mounting frame 21 provides stable physical support and spatial isolation for the crimped valve strings 22. The rigid structure of the mounting frame 21 can withstand external impacts, preventing damage to the valve strings due to vibration or collision, making it suitable for complex industrial or outdoor environments.

[0045] Furthermore, the mounting frame 21 also includes at least one partition plate 214, with both ends of the partition plate 214 connected to two second side plates 213 respectively. The partition plate 214 divides the second receiving cavity into several partition chambers, each partition chamber containing a crimp valve string 22. Since the two second side plates 213 are connected to both ends of the partition plate 214 respectively, the overall structural strength of the mounting frame 21 is improved. The partition plate 214 blocks direct communication between the two partition chambers. If the crimp valve string 22 in one partition chamber malfunctions, the partition plate 214 can limit the spread of the problem, ensuring that the other partition chamber and the overall system are not affected. The partition design allows for individual disassembly or maintenance of the crimp valve string 22 on one side without requiring a complete system shutdown, improving maintenance efficiency.

[0046] Furthermore, the inner wall of one of the second side plates 213 is threaded with a top bolt 215. The first end of the crimp valve string 22 abuts against the top bolt 215, and the second end of the crimp valve string 22 abuts against the other second side plate 213, forming a "double-end support + axially adjustable" assembly mode. The top bolt 215 and the crimp valve string 22 are coaxially aligned to ensure uniform distribution of the compressive force. By adjusting the extension length of the top bolt 215, it can accommodate crimp valve strings 22 of different specifications (e.g., length difference ±20%) without requiring replacement of the frame or additional gaskets, thus improving versatility. The axial displacement of the top bolt 215 is directly converted into compressive force on the crimp valve string 22, allowing precise adjustment of the crimp valve string 22's fixation within the partition chamber, preventing vibration caused by excessive looseness or deformation caused by excessive tightness.

[0047] Furthermore, a positioning groove is provided on the end face of the first end of the crimp valve string 22, and a positioning protrusion 2151 is provided on the end of the top bolt 215 near the crimp valve string 22. The positioning protrusion 2151 abuts against the bottom of the positioning groove, forming a precision assembly structure of "concave-convex positioning + axial constraint". The abutment between the positioning protrusion 2151 and the bottom of the positioning groove ensures that the coaxiality error between the top bolt 215 and the crimp valve string 22 is ≤0.05mm, avoiding uneven distribution of compressive force due to eccentricity. For example, the positioning groove is spherical or conical, and the concave-convex structure guides the top bolt 215 and the crimp valve string 22 to automatically align, reducing manual adjustment time and improving assembly efficiency. The contact surface between the positioning protrusion 2151 and the bottom of the groove can increase the coefficient of friction (e.g., surface roughening treatment or coating with anti-loosening adhesive) to prevent the crimp valve string 22 from loosening due to vibration or thermal expansion and contraction after long-term use.

[0048] Furthermore, such as Figure 2 Combination Figure 4As shown, the single-phase power module also includes at least two water-cooled reactors 3, which are respectively disposed on the inner wall surface of the first side plate 13. The water-cooled reactors 3 extend along the second direction, and their cooling channels are connected to the cooling module 4. By adding the water-cooled reactors 3, the current can be smoothed. The water-cooled reactor 3 is a reactor used in the DC circuit after rectification. Since the pulse number of the rectifier circuit is always limited, there is always ripple in the output rectified voltage. This ripple is often harmful and needs to be suppressed by the water-cooled reactor 3. By adding the water-cooled reactor 3, the output DC is made closer to ideal DC.

[0049] For example, such as Figure 7 As shown, the water-cooled reactor 3 includes a connecting copper busbar 31, a positive copper busbar 32, a negative copper busbar 33, and two aluminum tubes 34 with cooling channels. The aluminum tubes 34 extend along a second direction, and several magnetic rings 35 are fitted onto each aluminum tube 34. The connecting copper busbar 31 is fitted onto the first end of both aluminum tubes 34, the positive copper busbar 32 is fitted onto the second end of one of the aluminum tubes 34, and the negative copper busbar 33 is fitted onto the second end of the other aluminum tube 34. The first ends of the two aluminum tubes 34 are simultaneously fixed to the connecting copper busbar 31, integrating the two aluminum tubes 34 together. The positive copper busbar 32 and the negative copper busbar 33 are respectively connected to the output current, and the magnetic rings 35 in the middle of the aluminum tubes 34 smooth the current. Water nozzles are provided at both ends of the aluminum tubes 34. This invention can use the water nozzles to connect the output coolant to remove heat, thereby improving the heat dissipation effect. It should be noted that the coolant used in this embodiment can be deionized water.

[0050] Furthermore, the water-cooled reactor 3 also includes a connecting pipe 36, one end of which is connected to the cooling channel of the second end of one of the aluminum tubes 34, and the other end of which is connected to the cooling channel of the second end of the other aluminum tube 34. By adding the connecting pipe 36, it is convenient to connect the cooling channels of the two aluminum tubes 34 in series.

[0051] For example, the connecting copper busbar 31 is provided with a first connecting hole 311, through which a first fastener passes and connects to the first side plate 13; and / or the positive copper busbar 32 is provided with a second connecting hole, through which a second fastener passes and connects to the first side plate 13; and / or the negative copper busbar 33 is provided with a third connecting hole 331, through which a third fastener passes and connects to the first side plate 13. The first, second, and third fasteners mentioned in this embodiment can be, but are not limited to, bolts or screws, etc., and are not subject to further restrictions.

[0052] For example, such as Figure 4As shown, the protective housing 1 also includes two handles 14, which are disposed on the outer wall surface of the corresponding first side plate 13. The addition of handles 14 facilitates the movement of the single-phase power module by installation personnel. Furthermore, anti-slip sleeves are provided on the surface of the handles 14 to increase the friction between the hand and the handles 14.

[0053] For example, such as Figure 5 As shown, the valve string in this embodiment also includes IGCT device 223 and diode 221. Different valve strings with different circuit topologies differ in the number and order of the water-cooled radiator 222, IGCT device 223, and diode 221 used; therefore, no further restrictions are imposed here. Figure 3 As shown, in this embodiment, the multiple water-cooled radiators 222 of the crimp valve string 22 are connected in series or in parallel through the valve string water pipe 9. Figure 1 As shown, the single-phase power module also includes a DC output copper busbar 7 and an AC input copper busbar 8. The valve string input terminal of the IGCT valve string module 2 passes through the first top plate 11 and is connected to the AC input copper busbar 8. The DC output copper busbar 7 is connected to the valve string output terminal of the IGCT valve string module 2. The single-phase power module also includes a first component copper busbar, a buffer capacitor 5, a second component copper busbar, and an absorption resistor 6. The two ends of the first component copper busbar are connected to the buffer capacitor 5 and the valve string, respectively. The two ends of the second component copper busbar are connected to the absorption resistor 6 and the valve string, respectively. The buffer capacitor 5 absorbs the voltage spike generated when the IGCT is turned off, and the absorption resistor 6 dissipates the energy of the absorption circuit.

[0054] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A single-phase power module, characterized in that, include: The IGCT valve string module (2) includes a mounting frame (21) and a valve string, wherein the valve string is divided into at least two crimped valve strings (22), the crimped valve strings (22) are connected to the mounting frame (21), each crimped valve string (22) extends along a first direction, and at least two crimped valve strings (22) are spaced apart along a second direction; A protective housing (1) is provided with an opening on at least one side, and the IGCT valve string module (2) is disposed inside the protective housing (1); The cooling module (4) is located at the bottom of the protective housing, and the water-cooled radiator (222) of the crimp valve string (22) is connected to the cooling module (4).

2. The single-phase power module according to claim 1, characterized in that, The mounting frame (21) includes a second top plate (211), a second bottom plate (212), and two second side plates (213). The second top plate (211), the second bottom plate (212), and the two second side plates (213) surround to form a second receiving cavity, and at least two sections of the crimp valve string (22) are disposed in the second receiving cavity.

3. The single-phase power module according to claim 2, characterized in that, The mounting frame (21) further includes at least one partition plate (214), the two ends of which are connected to two second side plates (213) respectively. The partition plate (214) divides the second receiving cavity into several partition chambers, and each partition chamber is provided with a crimp valve string (22).

4. The single-phase power module according to claim 2, characterized in that, One of the second side plates (213) has a top bolt (215) threadedly connected to its inner wall surface. The first end of the crimp valve string (22) abuts against the top bolt (215), and the second end of the crimp valve string (22) abuts against the other second side plate (213). The top bolt (215) and the crimp valve string (22) are arranged coaxially.

5. The single-phase power module according to claim 4, characterized in that, The first end face of the crimp valve string (22) is provided with a positioning groove, and the top bolt (215) is provided with a positioning protrusion (2151) at one end near the crimp valve string (22), and the positioning protrusion (2151) abuts against the bottom of the positioning groove.

6. The single-phase power module according to claim 1, characterized in that, The single-phase power module also includes: At least two water-cooled reactors (3) are respectively disposed in the protective housing. The water-cooled reactors (3) extend along the second direction and the cooling channels of the water-cooled reactors (3) are connected to the cooling module (4).

7. The single-phase power module according to claim 6, characterized in that, The water-cooled reactor (3) includes a connecting copper busbar (31), a positive copper busbar (32), a negative copper busbar (33), and two aluminum tubes (34) with cooling channels. Several magnetic rings (35) are fitted on the aluminum tubes (34). The connecting copper busbar (31) is fitted on the first end of the two aluminum tubes (34). The positive copper busbar (32) and the negative copper busbar (33) are respectively fitted on the second end of the two aluminum tubes (34).

8. The single-phase power module according to claim 7, characterized in that, The water-cooled reactor (3) also includes a connecting pipe (36), and the cooling channels at the second ends of the two aluminum tubes (34) are respectively connected to the two ends of the connecting pipe (36).

9. The single-phase power module according to claim 7, characterized in that, The protective housing (1) includes a first top plate (11), a first bottom plate (12) and two first side plates (13). The connecting copper busbar (31) is provided with a first connecting hole (311), and a first fastener passes through the first connecting hole (311) and connects to the first side plate (13).

10. The single-phase power module according to claim 9, characterized in that, The positive electrode copper busbar (32) is provided with a second connection hole, and a second fastener passes through the second connection hole to connect with the first side plate (13); and / or The negative electrode copper busbar (33) is provided with a third connection hole (331), and the third fastener passes through the third connection hole (331) and is connected to the first side plate (13).

Images