Pre-welding clamp

Abstract

The utility model belongs to the technical field of battery production, and discloses a pre-welding clamp which comprises a base and a pressing shell, the pressing shell is buckled on the base to form a containing cavity, one side face of the base is provided with a communication opening communicated with the containing cavity, the communication opening is used for allowing all tabs of a pre-welding core package to penetrate out, and the center line of the communication opening is lower than the center line of the containing cavity; the supporting rod is used for supporting all the tabs, and the supporting face of the supporting rod is not higher than the center line of the containing cavity. According to the pre-welding clamp, the communication opening communicated with the containing cavity is formed, and the center line of the communication opening is lower than that of the containing cavity, so that blocking of the cavity wall of the containing cavity to a pole lug of a pre-welding core package can be reduced, the distance between the pole lug of a pole piece adjacent to the bottom wall of the containing cavity and a supporting rod is reduced, and the welding quality of the pole piece is improved. Therefore, the redundancy of the tab on the edge side of the pre-welded core package is reduced, the tab pre-welding effect of the core package is ensured, the subsequent connection quality of the core package and the cover plate is effectively improved, and the production quality of the battery cell is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production, in particular to a pre-welding fixture. Background Art

[0002] The development of the multi-tab technology has greatly improved the energy density of lithium-ion batteries for electric vehicles. At present, in the battery production process, when coating the electrode sheet of a multi-tab battery cell, an empty foil area is reserved at the edge of the current collector to roll and cut to form an electrode sheet with tabs. Then, the stacked electrode sheets are placed in a pre-welding fixture, and the tabs of all the electrode sheets extend through a communication port reserved in the middle of the pre-welding fixture to a welding seat on one side for pre-welding to form a core package with a welded end. Then, the pre-welded core package is shelled, and the welded end of the tab is finally welded to the cover plate.

[0003] As Figure 1 shown, during the pre-welding process, the tab 12' of the electrode sheet 11' on the side of the stacking direction needs to be bent along the stacking direction and then extend through the communication port to the welding seat 2' on one side for welding. However, after the pre-welding is completed, the tabs 12' of each layer of the electrode sheet 11' are released from the restraint of the pre-welding fixture 3'. At this time, the redundant amount of the tab 12' of the core package 1' on the side of the stacking direction is relatively large ( Figure 1 the tabs 12' of the electrode sheet 11' located on the upper side and the lower side among the stacked electrode sheets 11'), that is, the distance from the tab 12' of the electrode sheet 11' on the side of the core package 1' along the stacking direction to the welding end is relatively long. The distance from the electrode sheet 11' on the side of the core package 1' along the stacking direction to the communication port is A, and the distance from the side of the communication port close to the core package 1' to the welding seat is B. Then, the length of the tab 12' of the electrode sheet 11' on the outermost side of the core package 2' along the stacking direction to the welding end is A + B. The tab 12' with the length of A + B is likely to loosen and spread into the gap between the cover plate and the housing during the subsequent capping process, resulting in full welding of the cover plate and affecting the production quality of the battery cell. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a pre-welding fixture, which has a simple structure and good pre-welding effect.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] Provide a pre-welding fixture, including a base and a pressing shell. The pressing shell is buckled on the base in the vertical direction and cooperates with the base to form a receiving cavity for clamping the pre-welded core package. One side surface of the base and / or the pressing shell has a communication port connected to the receiving cavity. The communication port is used for all the tabs of the pre-welded core package to pass through, and along the vertical direction, the center line of the communication port is lower than the center line of the receiving cavity;

[0007] The support rod is arranged opposite to and spaced from the communication port along the first direction. The support rod is used to support all the tabs, and the support surface of the support rod is not higher than the center line of the accommodation cavity. The vertical direction is arranged at an angle to the first direction.

[0008] As a preferred solution of the pre-welding fixture, along the vertical direction, the ratio of the vertical distance D between the highest point of the communication port and the bottom wall of the accommodation cavity to the height H of the accommodation cavity is less than 0.5; and / or

[0009] The distance between the lowest point of the communication port and the bottom wall of the accommodation cavity is 0.

[0010] As a preferred solution of the pre-welding fixture, the support rod extends along the second direction, and along the second direction, the length of the support rod is equal to the length of the communication port. The vertical direction, the first direction and the second direction are arranged at angles to each other.

[0011] As a preferred solution of the pre-welding fixture, it further includes a connecting plate. The connecting plate is fixed to the base or the pressure shell, and the support rod is installed on the connecting plate in a position-adjustable manner along the first direction.

[0012] As a preferred solution of the pre-welding fixture, the connecting plate is provided with a waist-shaped hole extending along the first direction. The end of the support rod has a threaded hole, and a bolt passes through the waist-shaped hole and is screwed into the threaded hole, and the connecting plate can be clamped between the nut of the bolt and the support rod.

[0013] As a preferred solution of the pre-welding fixture, the number of the connecting plates is two. The two connecting plates are arranged at intervals along the second direction. The adjacent sides of the two connecting plates are both provided with chutes extending along the first direction. The two ends of the support rod are respectively slidably arranged in the chutes.

[0014] As a preferred solution of the pre-welding fixture, it further includes an adjusting component. The adjusting component is arranged in the accommodation cavity. The adjusting component includes two clamping blocks arranged at intervals along the second direction. The length of the clamping block extends along the first direction. A placement groove for placing the pre-welding core package is formed between the two clamping blocks at intervals. The two clamping blocks are slidably arranged along the second direction on the cavity wall of the accommodation cavity and are selectively locked.

[0015] As a preferred solution of the pre-welding fixture, the adjusting component further includes a support block. The two clamping blocks and the support block enclose to form the placement groove. The support block is slidably arranged along the first direction on the cavity wall of the accommodation cavity and is selectively locked.

[0016] As a preferred solution of the pre-welding fixture, avoidance grooves are provided on both sides of the base and / or the pressure housing along the second direction; and / or,

[0017] The pre-welding fixture further includes a handle, and the handle is provided on both sides of the base and / or the pressure housing along the second direction.

[0018] As a preferred solution of the pre-welding fixture, a positioning portion is provided on one side of the two adjacent sides of the base and the pressure housing, and a positioning hole is provided on the other side, and the positioning portion is inserted into the positioning hole.

[0019] The beneficial effects of the present utility model are as follows: By forming a receiving cavity for clamping and welding the core package through the snap-fitting base and pressure housing, the placement convenience and placement position accuracy of the pre-welded core package are improved; by providing a communication port communicated with the receiving cavity, and the center line of the communication port is lower than the center line of the receiving cavity, the blocking of the pole ears of the pre-welded core package by the cavity wall of the receiving cavity can be reduced, so that the pole ears adjacent to the bottom wall of the receiving cavity directly pass through the communication port and are hung on the support rod, reducing the distance between the pole ears of the pole piece adjacent to the bottom wall of the receiving cavity and the support rod, thereby reducing the redundancy of the pole ears on the side of the pre-welded core package, ensuring the pre-welding effect of the pole ears of the core package, effectively improving the connection quality between the core package and the cover plate in the subsequent process, and thus ensuring the production quality of the battery cell. Description of the Drawings

[0020] The following further describes the present utility model in detail according to the drawings and embodiments.

[0021] Figure 1 is a schematic structural view of a prior art pre-welding fixture;

[0022] Figure 2 is a schematic structural view of the pre-welding fixture according to an embodiment of the present utility model;

[0023] Figure 3 is a schematic view of the cooperation between the pre-welding fixture according to an embodiment of the present utility model and the core package;

[0024] Figure 4 is Figure 2 an enlarged view of part E of

[0025] Figure 5 is a schematic structural view of the base according to an embodiment of the present utility model;

[0026] Figure 6 is a schematic structural view of the pressure housing according to an embodiment of the present utility model.

[0027] Figure 1 In:

[0028] 1′, core package; 11′, pole piece; 12′, pole ear; 2′, welding base; 3′, pre-welding fixture;

[0029] Figures 2 to 6 In:

[0030] 100, core package; 101, tab.

[0031] 1, base; 11, first receiving groove; 12, first strip hole; 13, second strip hole; 2, pressing shell; 21, second receiving groove; 3, support rod; 31, threaded hole; 4, communication port; 5, connecting plate; 51, kidney-shaped hole; 52, sliding groove; 6, adjusting assembly; 61, clamping block; 611, first connection hole; 62, placing groove; 63, support block; 631, second connection hole; 7, avoiding groove; 8, receiving cavity. Detailed implementation manner

[0032] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that, for the convenience of description, only the parts related to the present utility model are shown in the drawings, rather than all the structures.

[0033] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0034] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above", and "on the top" of the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below", and "under the bottom" of the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0035] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of description and simplifying the operation, 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. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0036] As Figure 2 and Figure 3 shown, the pre-welding fixture of the embodiment of the present utility model includes a base 1 and a pressure housing 2. The pressure housing 2 is buckled on the base 1 in the vertical direction and cooperates with the base 1 to form a receiving cavity 8 for clamping the pre-welding core package 100 (the vertical direction is the Z direction shown in the figure). One side surface of the base 1 and / or the pressure housing 2 has a communication port 4 connected to the receiving cavity 8. The communication port 4 is used for all the tabs 101 of the pre-welding core package 100 to pass through. And along the vertical direction, the center line of the communication port 4 is lower than the center line of the receiving cavity 8; a support rod 3, along the first direction (the first direction is the X direction shown in the figure), the support rod 3 is opposite to and spaced from the communication port 4. The support rod 3 is used to support all the tabs 101, and the support surface of the support rod 3 is not higher than the center line of the receiving cavity 8. The vertical direction and the first direction are arranged at an angle.

[0037] It can be understood that the base 1 and the pressure housing 2 formed by buckling form a receiving cavity 8 for clamping and welding the core package 100, which improves the placement convenience and placement position accuracy of the pre-welding core package 100; by providing a communication port 4 communicated with the receiving cavity 8 and the center line of the communication port 4 being lower than the center line of the receiving cavity 8, it can reduce the blocking of the cavity wall of the receiving cavity 8 on the tabs 101 of the pre-welding core package 100, so that the tabs 101 adjacent to the bottom wall of the receiving cavity 8 directly pass through the communication port 4 and are hung on the support rod 3, reducing the distance between the tabs 101 of the pole piece adjacent to the bottom wall of the receiving cavity 8 and the support rod 3, thereby reducing the redundancy of the tabs 101 on the side of the pre-welded core package 100, ensuring the pre-welding effect of the tabs 101 of the core package 100, effectively improving the connection quality between the subsequent core package 100 and the cover plate, and thus ensuring the production quality of the battery cell.

[0038] In this embodiment, the vertical direction, the first direction and the second direction are perpendicular to each other in pairs. A first receiving groove 11 is recessed on one side of the base 1 facing the pressing plate, and a second receiving groove 21 is recessed on one side of the pressure housing 2 facing the base 1. The first receiving groove 11 and the second receiving groove 21 are buckled to form the receiving cavity 8, and a communication port 4 is opened on one side surface of the base 1 adjacent to the support rod 3. Of course, the communication port 4 can also be provided on one side surface of the pressing cover adjacent to the support rod 3. Or, communication ports 4 are opened on both the side surface of the base 1 adjacent to the support rod 3 and the side surface of the pressing cover adjacent to the support rod 3, and the two communication ports 4 penetrate through the adjacent sides of the base 1 and the pressing cover respectively to achieve communication.

[0039] Further, in the vertical direction, the ratio of the vertical distance D between the highest point of the communication port 4 and the bottom wall of the accommodation cavity 8 to the height H of the accommodation cavity 8 is less than 0.5, that is, the communication port 4 is entirely located in the lower half of the accommodation cavity 8, so as to facilitate the protrusion of the tab 101 located on the bottom wall of the accommodation cavity 8, even if the communication port 4 is close to the bottom of the first accommodation groove 11, reducing the distance between the electrode plate at the bottom of the first accommodation groove 11 and the communication port 4. Optionally, the distance between the lowest point of the communication port 4 and the bottom wall of the accommodation cavity 8 is 0, that is, the first accommodation groove 11 penetrates through the base 1 to form the communication port 4 on one side adjacent to the support rod 3 along the first direction, which can completely remove the blockage of the tab 101 by the groove wall of the first accommodation groove 11, further reducing the length of the tab 101 of the electrode plate at the bottom of the first accommodation groove 11 from the welding end.

[0040] Exemplarily, as Figure 1 , Figure 2 and Figure 3 shown, the size of the tab 101 of the electrode plate located at the bottom of the first accommodation groove 11 from the welding end is C. According to the Pythagorean theorem, A2 + B2 = C2, then C2 < (A + B)2, that is, by using the support of the support rod 3 for the tab 101 and arranging the communication port 4 formed by the first accommodation groove 11 penetrating through the base 1 on one side adjacent to the support rod 3 along the first direction, the length of the tab 101 of the electrode plate adjacent to the bottom of the first accommodation groove 11 from the welding end can be effectively shortened, reducing the redundancy of the tab 101 of the electrode plate on the side of the core package 100 along the stacking direction, thereby avoiding the situation that the tab 101 of the core package 100 is stuck between the cover plate and the housing during the welding of the tab 101 and the cover plate due to the too long redundancy of the tab 101, resulting in full welding or explosion welding; or avoiding the situation that the cover plate pushes the tab 101 with a longer redundancy to be inserted backward into the core package 100 after the core package 100 is encapsulated, causing short circuits and other battery cell defects. By reducing the redundancy of the tab 101 on one side of the core package 100 along the electrode plate stacking direction, the occupied space of the tab 101 on this side is reduced, and the saved space can be used for placing the tab 101 on the other side along the electrode plate stacking direction, thereby avoiding the situation of the spread of the tabs 101 on both sides.

[0041] In this embodiment, the base 1 is composed of a frame body, and the frame body includes a bottom plate, two first side plates (the second direction is the Y direction shown in the figure) arranged at intervals on the bottom plate along the second direction, and a second side plate connecting the ends of the two first side plates. One end of the two first side plates along the first direction is connected by the second side plate, and the other end forms the communication port 4 at intervals. The pressure shell 2 is composed of a frame body and a third side plate, and the third side plate seals the communication port 4 of the frame body to form the pressure shell 2, that is, the pressure shell 2 has the same frame structure as the base 1, which is convenient for production and effectively reduces the mold opening and production costs.

[0042] Further, the support rod 3 extends along the second direction, and along the second direction, the length of the support rod 3 is equal to the length of the communication port 4. The vertical direction, the first direction, and the second direction are arranged at an angle to each other. By ensuring the length of the support rod 3, the support for the tab 101 passing through the communication port 4 is ensured.

[0043] Optionally, as Figure 2 , Figure 3 and Figure 4 shown, the pre-welding fixture further includes a connecting plate 5. On one side of the base 1 adjacent to the support rod 3, two connecting plates 5 are arranged at intervals along the second direction. The two ends of the support rod 3 are respectively slidably arranged on the two connecting plates 5 along the first direction and selectively locked. The first direction and the second direction are arranged at an angle. That is, a connecting plate 5 is provided at one end of each of the two first side plates of the base 1 away from the second side plate. After the tab 101 of the core package 100 is welded on the welding seat, the tab 101 extending from the welding end of the core package 100 needs to be cut. Since the lengths of different types of battery cells are different, the reserved lengths of the tabs 101 also vary. By adjusting the setting of the support rod 3 and the connecting plate 5 along the first direction, it is possible to adapt to core packages 100 with different extended lengths of tabs 101, improving the versatility of the welding fixture. Of course, the connecting plate 5 can also be provided on the pressure cover in addition to being provided on the base 1, which is not limited here.

[0044] Exemplarily, both of the two connecting plates 5 are provided with waist-shaped holes 51 penetrating along the second direction, and the length of the waist-shaped holes 51 extends along the first direction. Threaded holes 31 are respectively provided at the two ends of the support rod 3. Bolts pass through the waist-shaped holes 51 and are screwed into the threaded holes 31, and the connecting plate 5 can be clamped between the nut of the bolt and the support rod 3. That is, the distance between the support rod 3 and the base 1 along the first direction is adjusted according to the preset length of the tab 101 of the core package 100, and then the support rod 3 is fixed to the connecting plate 5 by connecting the bolts through the waist-shaped holes 51 and the threaded holes 31. The threaded connection is stable and convenient for disassembly and assembly. When adjustment is needed, only the bolts at both ends need to be loosened.

[0045] Further, on one side of the two connecting plates 5 adjacent to each other, sliding grooves 52 are provided, and the sliding grooves 52 extend along the first direction. The two ends of the support rod 3 are respectively slidably arranged in the sliding grooves 52. It should be noted that the sliding grooves 52 at least penetrate one side of the connecting plate 5 along the second direction to facilitate inserting the support rod 3 into the sliding grooves 52. Through the setting of the sliding grooves 52, the guiding property of the movement adjustment of the support rod 3 can be improved, the adjustment is convenient, and the support for the tab 101 by the support rod 3 can be improved by using the groove walls of the sliding grooves 52 to support the support rod 3. Of course, in this embodiment, the waist-shaped holes 51 penetrate the bottom of the sliding grooves 52, so that after the support rod 3 is moved and adjusted along the sliding grooves 52, the support rod 3 is fixed by passing bolts through the waist-shaped holes 51. Of course, in other embodiments, a slider and guide rail cooperation or a direct drive mechanism can also be used for adjustment and limitation.

[0046] In some embodiments, such as Figure 5 and Figure 6 shown, the pre-welding fixture further includes an adjusting component 6. The bottom of both the first receiving groove 11 and the second receiving groove 21 is provided with the adjusting component 6. The adjusting component 6 includes two clamping blocks 61 spaced along the second direction, and a placement groove 62 for placing the battery cell is formed between the two clamping blocks 61. The two clamping blocks 61 are slidably arranged along the second direction at the bottom of the receiving groove and are selectively locked. It can be understood that the adjusting component 6 at the bottom of the first receiving groove 11 and the adjusting component 6 at the bottom of the second receiving groove 21 are arranged oppositely. After the clamping blocks 61 of one adjusting component 6 are moved and adjusted, the clamping blocks 61 of the other adjusting component 6 should also be adjusted correspondingly. By the slidable arrangement of the clamping blocks 61, the placement groove 62 with different sizes along the second direction can be formed to adapt to the welding of the core packages 100 with different sizes along the second direction, improving the versatility and compatibility of the pre-welding fixture.

[0047] Exemplarily, two first connection holes 611 are spaced along the second direction on one side of the clamping block 61 adjacent to the bottom of the receiving groove in the vertical direction. The first connection holes 611 are threaded holes 31. Two first strip holes 12 spaced along the first direction are penetrated through the bottom of the receiving groove. After the clamping block 61 is moved and adjusted along the second direction, the bolt passes through the first strip hole 12 and is screwed into the first connection hole 611 to fix the clamping block 61 to the bottom of the receiving groove. The threaded connection is stable and the disassembly and assembly are convenient.

[0048] Further, the adjusting component 6 further includes a support block 63. The two clamping blocks 61 and the support block 63 enclose to form the placement groove 62. The support block 63 is slidably arranged along the first direction at the bottom of the receiving groove and is selectively locked. By the slidable arrangement of the support block 63, the placement groove 62 with different sizes along the first direction can be formed to adapt to the welding of the core packages 100 with different sizes along the first direction, improving the versatility and compatibility of the pre-welding fixture.

[0049] Exemplarily, the length of the support block 63 extends along the second direction. Two second connection holes 631 are spaced along the second direction on one side of the support block 63 facing the bottom of the receiving groove. The second connection holes 631 are threaded holes 31. Two second strip holes 13 spaced along the second direction are penetrated through the bottom of the receiving groove. The second strip holes 13 extend along the first direction. After the support block 63 is moved and adjusted along the first direction, the bolt passes through the second strip hole 13 and is screwed into the second connection hole 631 to fix the support block 63 to the bottom of the receiving groove. The threaded connection is stable and the disassembly and assembly are convenient. Of course, in other embodiments, the moving adjustment and locking can also be realized in forms such as the cooperation of a slider and a guide rail, a linear driving mechanism, etc., and no more examples are given here.

[0050] Furthermore, the adjusting component 6 further includes a top plate. The clamping block 61, the top plate and the bottom of the first receiving groove 11 enclose a placement groove 62. The top plate is spaced from the bottom of the second receiving groove 21, and the top plate can be adjusted in the vertical direction relative to the pressing housing 2 and selectively locked. Through the adjustment of the top plate, placement grooves 62 with different dimensions in the vertical direction can be formed to adapt to the welding of the tabs 101 of the core package 100 with different dimensions in the vertical direction, improving the versatility and compatibility of the pre-welding fixture. For example, the top plate is arranged at the bottom of the second receiving groove 21 through an electric cylinder, and the adjustment of the top plate is achieved by adjusting the extended length of the electric cylinder.

[0051] In other embodiments, avoiding grooves 7 are provided on both sides of the base 1 along the second direction. Through the arrangement of the avoiding grooves 7 on the base 1, it is convenient for the operator to lift and transfer the base 1; avoiding grooves 7 are provided on both sides of the pressing housing 2 along the second direction. Through the arrangement of the avoiding grooves 7 on the pressing housing 2, it is convenient for the operator to lift and transfer the pressing housing 2, thereby facilitating the loading and unloading of the core package 100. Of course, in some embodiments, the avoiding grooves 7 may be provided only on the base 1 or the pressing housing 2.

[0052] Optionally, the pre-welding fixture further includes handles. Handles are provided on both sides of the base 1 and the pressing housing 2 along the second direction. Through the arrangement of the handles, it is convenient for the operator to lift the base 1 or move it by holding the handles. Of course, in some embodiments, the handles are provided only on the base 1 or the pressing housing 2, or the avoiding grooves 7 are provided on the base 1 and the handles are provided on the pressing housing 2, or the handles are provided on the base 1 and the avoiding grooves 7 are provided on the pressing housing 2, etc.

[0053] Further, a positioning portion is provided on one side of the base 1 facing the pressing housing 2, and a positioning hole is provided on one side of the pressing housing 2 facing the base 1. The positioning portion is inserted into the positioning hole. Through the cooperation of the positioning portion and the positioning hole, the guiding property when the pressing housing 2 and the base 1 are snap-connected can be effectively improved, thereby improving the installation accuracy of the connection between the pressing housing 2 and the base 1. Of course, it is not limited to setting the positioning portion on the side of the base 1 facing the pressing housing 2 and setting the positioning hole on the side of the pressing housing 2 facing the base 1. The positioning portion can also be set on the side of the pressing housing 2 facing the base 1 and the positioning hole can be set on the side of the base 1 facing the pressing housing 2.

[0054] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the embodiments of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A pre-welding fixture for clamping and positioning a pre-welding core package, characterized in that: include: A base and a compression shell, wherein the compression shell is buckled on the base in the vertical direction and cooperates with the base to form a receiving cavity for clamping the pre-welded core package, and a side surface of the base and / or the compression shell has a connecting port connected to the receiving cavity, and the connecting port is used for all the tabs of the pre-welded core package to pass through, and along the vertical direction, the center line of the connecting port is lower than the center line of the receiving cavity; A support rod is arranged opposite to the connecting port and spaced apart along a first direction, the support rod is used to support all the tabs, and a supporting surface of the support rod is not higher than a center line of the accommodating cavity, and the vertical direction is arranged at an angle to the first direction.

2. The pre-welding fixture according to claim 1, characterized in that: Along the vertical direction, the ratio of the vertical distance D between the highest point of the communication port and the bottom wall of the accommodating cavity to the height H of the accommodating cavity is less than 0.5; and / or The distance between the lowest point of the communication port and the bottom wall of the accommodating cavity is 0.

3. The pre-welding fixture according to claim 1, characterized in that: The support rod extends along a second direction, and along the second direction, the length of the support rod is equal to the length of the communication port, and the vertical direction, the first direction and the second direction are arranged at an angle to each other.

4. The pre-welding fixture according to claim 3, characterized in that: It also includes a connecting plate, which is fixed on the base or the compression shell, and the support rod is installed on the connecting plate in an adjustable manner along the first direction.

5. The pre-welding fixture according to claim 4, characterized in that: The connecting plate is provided with a waist-shaped hole extending along the first direction, and the end of the support rod has a threaded hole. The bolt passes through the waist-shaped hole and is screwed into the threaded hole, and the connecting plate can be clamped between the nut of the bolt and the support rod.

6. The pre-welding fixture according to claim 4, characterized in that: There are two connecting plates, which are spaced apart along the second direction. One side of the two connecting plates adjacent to each other is provided with a slide groove extending along the first direction, and both ends of the support rod are slidably disposed in the slide groove.

7. The pre-welding fixture according to any one of claims 1 to 6, characterized in that: It also includes an adjustment component, which is arranged in the accommodating cavity. The adjustment component includes two clamping blocks arranged at intervals along the second direction. The length of the clamping blocks extends along the first direction. A placement groove for placing the pre-welded core package is formed between the two clamping blocks. The two clamping blocks are slidably arranged on the cavity wall of the accommodating cavity along the second direction and selectively locked.

8. The pre-welding fixture according to claim 7, characterized in that: The adjustment assembly further includes a support block. The two clamping blocks and the support block are combined to form the placement groove. The support block is slidably disposed on the cavity wall of the accommodating cavity along the first direction and selectively locked.

9. The pre-welding fixture according to any one of claims 1 to 6, characterized in that: The base and / or the compression shell are provided with avoidance grooves on both sides along the second direction; and / or, It also includes handles, and the base and / or the compression shell are provided with the handles on both sides along the second direction.

10. The pre-welding fixture according to any one of claims 1 to 6, characterized in that: One of the two sides of the base and the compression shell adjacent to each other is provided with a positioning portion, and the other side is provided with a positioning hole, and the positioning portion is inserted into the positioning hole.

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