Battery cell with split type connecting sheets

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cell with a split type connecting piece, the battery cell comprises a cover plate, a pole, a first connecting component and a second connecting component, the pole is mounted on the cover plate, and a mounting groove and a mounting through hole which are communicated with each other are formed in the pole; the first connecting component is used for connecting a tab cluster of a pole group; the second connecting component comprises a body and a mounting lug boss which are connected with each other, the mounting lug boss is arranged on one side, deviating from the pole group, of the body, and the body of the second connecting component and the first connecting component can be connected in a welding manner during assembly; the body is installed in the installation groove, the installation protruding part is installed in the installation through hole, and a welding area located on the outer side of the projection of the installation protruding part is formed on the body in the first preset direction. Therefore, by redesigning the structures of the connecting piece and the pole, whether the connecting piece and the pole are installed in place or not can be observed conveniently, and the connecting piece is of a detachable structure and is convenient to transport.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of batteries, in particular to a battery cell with split connecting pieces. BACKGROUND

[0002] At present, a battery cell comprises a pole group, a connecting piece and a cover plate assembly; the connecting piece is welded with a pole lug cluster of the pole group and a pole post on the cover plate assembly; at present, the following two assembly structures are used for some pole posts and connecting pieces, first, a blind hole is formed on the pole post, the upper structure of the connecting piece is inserted into the blind hole and is welded with the pole post through penetration welding; since it is a blind hole, the connecting piece cannot be observed to be inserted in place on the outside of the cover plate, that is, the outside of the pole post, thereby causing problems such as false welding; second, a through hole is formed on the pole post, the upper structure of the connecting piece is inserted into the through hole; this structure can observe whether the connecting piece is inserted in place, but welding is difficult and false welding is prone to occur, and even welding spatter is prone to fall into the through hole. It can be seen that the two assembly structures have great problems, and therefore, a new assembly structure of the connecting piece and the pole post needs to be developed at present, which is convenient for observing whether installation is in place and convenient for welding operation, and false welding is not prone to occur. CONTENT OF THE UTILITY MODEL

[0003] The application aims to provide a battery cell with split connecting pieces, which solves the technical problem in the prior art that a new assembly structure of the connecting piece and the pole post needs to be developed at present, which is convenient for observing whether installation is in place and convenient for welding operation, and false welding is not prone to occur.

[0004] The application provides a battery cell with split connecting pieces, which comprises a cover plate, a pole post, a first connecting member and a second connecting member; the pole post is installed on the cover plate, the pole post is formed with an installation groove and an installation through hole which are sequentially arranged and connected along a first preset direction, the installation groove penetrates the inside of the pole post close to the pole group, and the installation through hole penetrates the outside of the pole post away from the pole group;

[0005] The first connecting member is used for connecting a pole lug cluster of the pole group; the second connecting member comprises a body and an installation protruding part which are connected, the installation protruding part is arranged on the side of the body away from the pole group along the first preset direction, the body of the second connecting member has no connection relationship with the first connecting member when the body is delivered and can be independently placed, and the two can be connected through welding when assembled;

[0006] The body is installed in the installation groove, the installation protruding part is installed in the installation through hole, and the body is formed with a welding area on the projection outside of the installation protruding part along the first preset direction.

[0007] In the above technical solution, further, the first connecting member is formed with a plug hole, and the body is plugged in the plug hole.

[0008] In any of the above technical solutions, further, the first connecting member is a flat plate structure.

[0009] In any of the above technical solutions, further, the number of the pole groups is two, and the pole groups are sequentially stacked along a second preset direction; the first connecting member is formed with a weight-reducing notch to divide the first connecting member into two connecting parts along the second preset direction, and the two connecting parts are connected with the pole lug clusters of the two pole groups corresponding respectively.

[0010] In any of the above technical solutions, further, along the first preset direction, the second connecting member is arranged on the side of the first connecting member away from the pole group.

[0011] In any of the above technical solutions, further, the body and the mounting protrusion are both cylindrical structures.

[0012] In any of the above technical solutions, further, along the first preset direction, the projection of the mounting protrusion falls within the projection of the body, and along the direction perpendicular to the first preset direction, the minimum gap between the edges of the two projections is L, and 2mm<L<3mm.

[0013] In any of the above technical solutions, further, along the first preset direction, the height of the mounting protrusion is h, and 0.6mm<h<1.2mm.

[0014] In any of the above technical solutions, further, the mounting protrusion does not protrude from the pole post, and the height difference between the two is S, and 0.1mm<S<0.2mm.

[0015] In any of the above technical solutions, further, along the first preset direction, the depth of the mounting groove is H, and 4mm<H<5mm.

[0016] In any of the above technical solutions, further, the welding area is an annular area around the mounting protrusion along the projection of the first preset direction.

[0017] In any of the above technical solutions, further, along the direction perpendicular to the first preset direction, the side of the pole post away from the pole group is formed with a welding thinning area located outside the outer periphery of the mounting through hole.

[0018] In any of the above technical solutions, further, along the first preset direction, the depth of the welding thinning area is L1, and 0.5mm < L1 < 0.7mm.

[0019] In any of the above technical solutions, further, along the direction perpendicular to the first preset direction, the width of the welding thinning area is L0, and 2mm < L0 < 3mm.

[0020] In any of the above technical solutions, further, along the first preset direction, the projection of the mounting protrusion falls within the projection of the body, and along the direction perpendicular to the first preset direction, the minimum gap between the edges of the two projections is L, along the direction perpendicular to the first preset direction, the width of the welding thinning area is L0, and L0 < L.

[0021] In any of the above technical solutions, further, the welding thinning area and the welding area are annular areas matched with each other.

[0022] In any of the above technical solutions, further, the battery cell with split connecting pieces further comprises a plurality of insulating pieces, and each of the plurality of insulating pieces is arranged on the inner side of the cover plate close to the pole group and is sequentially and spacedly arranged along the length direction of the cover plate; the cover plate is formed with a first through hole penetrating through the two opposite sides of the cover plate along the first preset direction, and the pole post is mounted in the first through hole; along the first preset direction, the insulating piece located below the pole post is formed with a second through hole corresponding to the first through hole.

[0023] In any of the above technical solutions, further, the cover plate is formed with a liquid injection hole, and the insulating piece located below the liquid injection hole along the first preset direction is formed with a liquid blocking groove corresponding to the liquid injection hole, and the side wall of the liquid blocking groove is formed with a liquid distribution port.

[0024] In any of the above technical solutions, further, the battery cell with split connecting pieces further comprises an explosion-proof valve, the cover plate is formed with an auxiliary through hole penetrating through the two opposite sides of the cover plate along the first preset direction, and the explosion-proof valve is mounted in the auxiliary through hole, and the insulating piece located below the explosion-proof valve along the first preset direction is formed with a first exhaust groove corresponding to the explosion-proof valve, the bottom wall of the first exhaust groove is formed with a first exhaust through hole, and the side wall of the first exhaust groove is formed with a second exhaust through hole.

[0025] In any of the above technical solutions, further, along the length direction of the cover plate, the insulating pieces located on the opposite sides of the explosion-proof valve are each formed with a gas inlet port, a second exhaust groove and a gas guide groove sequentially and continuously connected, the gas guide groove extends towards the direction of the first exhaust groove and is in communication with the first exhaust groove.

[0026] Compared with the prior art, the application has the following beneficial effects:

[0027] The battery cell with a split connecting piece provided by the application has the following beneficial effects. The connecting piece and the pole structure are redesigned, a mounting protrusion is arranged on the second connecting member, the mounting protrusion can be mounted in the mounting through hole of the pole, the structure is exposed, and thus it is convenient to observe whether the assembly is in place. In addition, the side portion of the second connecting member below the mounting protrusion is provided with a welding area. Thus, the pole structure outside the mounting protrusion and the welding area can be penetrated and welded, which is simple and convenient to operate and requires low personnel. That is, the fault tolerance rate is improved, and the situation that the virtual welding and welding spatter fall into the through hole does not occur, and the welding quality is greatly improved. In addition, the second connecting member is directly inserted into the mounting groove and the mounting through hole of the pole, which greatly saves space and effectively reduces the space occupied by the connecting piece in the battery cell, thereby improving the space utilization rate.

[0028] In addition, the connecting piece is designed as a split structure, that is, the first connecting member and the second connecting member, which belong to a split structure. Thus, when the material is delivered, the first connecting member and the second connecting member can be stacked separately. Compared with the integrated connecting piece structure, more connecting members can be stacked in a limited space, thereby reducing transportation costs. In addition, the assembly and feeding are more convenient, and the assembly is simple. In addition, the connecting piece is assembled separately, and the stress generated by the ultrasonic welding of the tab cluster and the first connecting member does not affect the second connecting member, thereby ensuring the assembly and welding of the second connecting member and the pole.

[0029] In addition, the connecting structure composed of the first connecting member and the second connecting member increases the heat dissipation area compared with the connecting piece in the prior art, improves the heat dissipation effect, and thus helps to improve the performance of the battery cell. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the specific embodiments of the application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0031] Figure 1 The exploded view of the first connecting member and the second connecting member provided by the embodiment of the application;

[0032] Figure 2 The assembly view of the first connecting member and the second connecting member provided by the embodiment of the application;

[0033] Figure 3 Another assembly view of the first connecting member and the second connecting member provided for the embodiment of the present application;

[0034] Figure 4 Structural schematic view of the pole provided for the embodiment of the present application;

[0035] Figure 5 Another structural schematic view of the pole provided for the embodiment of the present application;

[0036] Figure 6 Sectional view of the pole provided for the embodiment of the present application;

[0037] Figure 7 Exploded view of the battery cell with split connecting piece provided for the embodiment of the present application;

[0038] Figure 8 Exploded view of the cover plate portion provided for the embodiment of the present application;

[0039] Figure 9 Partial sectional view of the battery cell with split connecting piece provided for the embodiment of the present application;

[0040] Figure 10 Structural schematic view of the plurality of insulating members provided for the embodiment of the present application;

[0041] Figure 11 Structural schematic view of the first insulating member provided for the embodiment of the present application;

[0042] Figure 12 Structural schematic view of the Figure 11 Enlarged structural schematic view at A;

[0043] Figure 13 Structural schematic view of the second insulating member provided for the embodiment of the present application;

[0044] Figure 14 Another structural schematic view of the first insulating member provided for the embodiment of the present application;

[0045] Figure 15 Structural schematic view of the Figure 14 Enlarged structural schematic view at B.

[0046] Reference signs:

[0047] 1-cover plate, 101-injection hole, 2-pole column, 21-mounting groove, 22-mounting through hole, 23-stop step, 24-welding thinning area, 3-first connecting member, 31-plug hole, 32-weight-reducing notch, 33-connection part, 4-second connecting member, 41-body, 42-mounting protrusion, 43-welding area, 5-insulating piece, 51-first insulating piece, 52-second insulating piece, 53-first exhaust groove, 54-first exhaust through hole, 55-second exhaust through hole, 56-liquid blocking groove, 57-liquid distribution port, 58-air inlet, 59-second exhaust groove, 510-air guide groove, 6-explosion-proof valve, 7-sealing ring, 8-welding ring, 9-upper plastic, 10-pressing insulation structure, 11-pole group, 111-pole lug cluster, 12-housing. DETAILED DESCRIPTION

[0048] The technical solutions of the present application will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments.

[0049] The components of the embodiments of the present application generally described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application.

[0050] Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0051] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0052] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0053] Reference will now be made to Figures 1 to 15 An electric cell with split connection tabs is described according to some embodiments of the present application.

[0054] Reference will now be made to Figures 1 to 9 As shown in the drawings, embodiments of the present application provide an electric cell with split connection tabs, comprising: a cover plate 1, a pole 2, a first connection member 3 and a second connection member 4; wherein the pole 2 is installed on the cover plate 1, and the pole 2 is formed with an installation groove 21 and an installation through hole 22 which are sequentially arranged and connected along a first preset direction a, and the installation groove 21 penetrates the inner side of the pole 2 close to the pole group 11, and the installation through hole 22 penetrates the outer side of the pole 2 away from the pole group 11, that is, a stop step 23 is formed between the installation through hole 22 and the installation groove 21;

[0055] The first connection member 3 is located on the inner side of the cover plate 1 close to the pole group 11, and the first connection member 3 is used to connect the tab cluster 111 of the pole group 11; the second connection member 4 comprises a body 41 and an installation protruding part 42 which are connected, and along the first preset direction a, the installation protruding part 42 is arranged on the side of the body 41 away from the pole group 11, and the body 41 of the second connection member 4 has no connection relationship with the first connection member 3 when it is delivered and can be placed independently, and both can be connected by welding when assembled; the body 41 is installed in the installation groove 21, and the stop step 23 described above can limit the body 41, and the installation protruding part 42 is installed in the installation through hole 22, and along the first preset direction a, the body 41 is formed with a welding area 43 located on the projection outside of the installation protruding part 42.

[0056] According to the above described structure, it can be known that the electric cell with split connection tabs provided by the present application, by redesigning the structure of the connection tab and the pole 2, the installation protruding part 42 is arranged on the second connection member 4, the installation protruding part 42 can be installed in the installation through hole 22 of the pole 2, due to the structure exposed, and then it is convenient to observe whether the assembly is in place, and the side part of the second connection member 4 below the installation protruding part 42 is provided with a welding area 43, so that the pole 2 structure located outside the installation protruding part 42 and the welding area 43 can be penetrated and welded, which is simple and convenient to operate, and the requirement for personnel is low, that is, it is helpful to improve the fault tolerance rate, and the situation that virtual welding and welding spatter fall into the through hole will not occur, which greatly improves the welding quality, in addition, the second connection member 4 is directly inserted into the installation groove 21 and the installation through hole 22 of the pole 2, which greatly saves the space, effectively reduces the occupied space of the connection tab inside the electric cell, and improves the space utilization.

[0057] In addition, the connecting piece in the present application is designed as a split structure, i.e. the first connecting member 3 and the second connecting member 4, both of which belong to a split structure, so that the first connecting member 3 and the second connecting member 4 can be placed separately in a stack when delivered, and more connecting members can be stacked in a limited space compared with an integrated connecting piece structure, thereby reducing transportation costs, and in addition, the assembly is more convenient and simple, and since the connecting piece belongs to a split structure, the stress generated by ultrasonic welding of the tab cluster 111 and the first connecting member 3 does not affect the second connecting member 4, thereby ensuring the assembly and welding of the second connecting member 4 and the pole piece 2.

[0058] In addition, the connecting structure composed of the first connecting member 3 and the second connecting member 4 in the present application increases the heat dissipation area compared with the connecting piece in the prior art, improves the heat dissipation effect, and thereby helps to improve the performance of the battery cell.

[0059] Further, preferably, the first preset direction a can be the thickness direction of the cover plate 1, which can also be understood as the height direction of the pole group 11, of course, not limited thereto.

[0060] Further, preferably, the cover plate 1 is formed with a first through hole penetrating through both sides thereof along the first preset direction a, and the pole piece 2 is installed in the first through hole.

[0061] Further, preferably, along the first preset direction a, the second connecting member 4 is arranged on the side of the first connecting member 3 away from the pole group 11, that is, in the present embodiment, the second connecting member 4 is installed on the first connecting member 3 and extends upwardly toward the first connecting member 3.

[0062] In this embodiment, preferably, as shown in Figure 1 and Figure 2 , the first connecting member 3 is formed with a plug hole 31, and the body 41 is plugged into the plug hole 31.

[0063] According to the above-described structure, it can be known that the body 41 can be separated from the plug hole 31 when initially delivered, thereby being placed separately in a stack for convenient transportation, and in the assembly process, the bottom of the body 41 of the second connecting member 4 along the first preset direction a can be plugged into the plug hole 31 of the first connecting member 3, thereby playing a role of preliminary positioning, so that the first connecting member 3 and the second connecting member 4 are assembled more firmly and stably.

[0064] In this embodiment, preferably, as shown in Figures 1 to 3 , the first connecting member 3 is a flat plate structure formed with a plug hole 31.

[0065] According to the structure described above, the first connecting member 3 adopts a flat plate structure, which is convenient for cooperating with the tab cluster 111 arranged horizontally, saves space, and in particular, the flat plate first connecting member 3 can be installed below the tab cluster 111.

[0066] It should be noted that the first connecting member 3 can not be provided with the insertion hole 31, but the body 41 can be directly seated on the top of the first connecting member 3 and then welded, which is selected according to actual needs.

[0067] In this embodiment, preferably, as shown in the figure, Figure 7 The number of the pole groups 11 is two, and the pole groups 11 are sequentially stacked along the second preset direction b; the first connecting member 3 is formed with the weight-reducing notches 32 on the opposite sides of the insertion hole 31, so as to divide the first connecting member 3 into two connecting portions 33 along the second preset direction b, and the two connecting portions 33 are connected with the tab clusters 111 of the two pole groups 11 corresponding thereto in phase.

[0068] According to the structure described above, the weight-reducing notches 32 play a role in reducing weight and saving material cost, and the two connecting portions 33 on the two sides of the weight-reducing notches 32 can be welded with the tab clusters 111 of the two pole groups 11 corresponding thereto, respectively, to meet the assembly requirements.

[0069] Further, preferably, the aforementioned second preset direction b can be the width direction of the cover plate 1, and can also be understood as the width of the pole group 11 or the thickness direction of the pole group 11, of course, not limited to this. It should be noted that: not limited to the above-mentioned structure of two pole groups 11, the number of pole groups 11 can also be one or more than two, and then the following will be described in detail: when the number of pole groups 11 is one, for a single pole 2 and two pole groups 11, only one first connecting member 3 and one second connecting member 4 need to be provided, when the number of pole groups 11 is more than two, for example, three, four, five or eight and the like, and for even number of pole groups 11, every two pole groups 11 are taken as a group, and for a single pole 2 common to a group of pole groups 11, one first connecting member 3 and one second connecting member 4 need to be provided, and for odd number of pole groups 11, every two pole groups 11 are taken as a group along the arrangement order of the pole groups 11, which can follow the structure of the connecting member used by the aforementioned two pole groups 11, and for the extra single pole group 11, the structure of the connecting piece when one pole group 11 is used, that is, for the extra pole group 11 and the single pole 2, one first connecting member 3 and one second connecting member 4 can be provided, or other types of connecting piece structures, of course, not limited to this, for two pole groups 11 or more than two pole groups 11 in the present application, the two pole groups 11 can also not be divided into a group, and each pole group 11 and the single pole 2 can be separately provided with one connecting member and one second connecting member 4, and each pole group 11 does not interfere with each other.

[0070] In addition, it should be noted that: when one first connecting member 3 corresponds to one pole group 11, the first connecting member 3 can take half of the aforementioned structure and the like, which is selected according to actual needs.

[0071] In addition, it should be noted that: the first connecting member 3 can also not be provided with a relief gap, which is selected according to actual needs.

[0072] In this embodiment, preferably, as shown in Figure 1 and Figure 2 The body 41 and the mounting protrusion 42 are both cylindrical structures, which are regular in shape, convenient to assemble, and convenient to process and manufacture, of course, the shape of the body 41 and the mounting protrusion 42 can also be selected according to actual needs, for example: the body 41 can also be selected as a cuboid or a square structure, and the mounting protrusion 42 can also be selected as a cuboid or a square structure and the like.

[0073] In this embodiment, preferably, as shown in Figure 2As shown, along the first preset direction a, the projection of the mounting protrusion 42 falls within the projection of the body 41, and along the direction perpendicular to the first preset direction a, the minimum gap between the edges of the two projections is L, and 2mm < L < 3mm.

[0074] According to the above-described structure, along the first preset direction a, the area between the edge of the projection of the mounting protrusion 42 and the edge of the projection of the body 41 is the welding area 43. If the width of the welding area 43, i.e., the aforementioned L, is too small, the welding area is small, the structure after welding is unstable and not firm. If the welding area 43 is too large, it leads to more welding spatter, which may affect other surrounding structures, and prolong the welding operation time, reduce efficiency, and thus L is valued between 2mm-3mm.

[0075] Of course, the value range of L is not limited to the above, but L≤2mm or L≥3mm can also be allowed, which is selected according to actual needs.

[0076] In this embodiment, preferably, as shown in Figure 3 As shown, along the first preset direction a, the height of the mounting protrusion 42 is h, and 0.6mm < h < 1.2mm.

[0077] According to the above-described structure, the height h of the mounting protrusion 42 is valued between 0.6mm-1.2mm, which not only meets the observation and positioning effect, but also avoids design allowance to avoid increasing material consumption and helps to improve space utilization, and also avoids interference with other structures.

[0078] Of course, the value range of h is not limited to the above, but h≤0.6mm or h≥1.2mm can also be allowed, which is selected according to actual needs.

[0079] In this embodiment, preferably, as shown in Figure 9 As shown, along the first preset direction a, the mounting protrusion 42 does not protrude from the pole 2, and the height difference between the two is S, and 0.1mm < S < 0.2mm.

[0080] According to the above-described structure, after installation, an aluminum sheet, i.e., a conductive sheet, also needs to be installed on the top of the pole 2, and then the pole 2 and the aluminum sheet, i.e., the conductive sheet, are welded together. If S is too small, it may be due to processing errors that the mounting protrusion 42 protrudes from the pole 2, thereby lifting the aluminum sheet, i.e., the conductive sheet, which is not conducive to the welding of the two. If S is too large, the depth of the mounting groove 21 is small, which leads to the second connecting member 4 being unable to be inserted into place when assembling with the pole 2, and thus S is valued between 0.1mm-0.2mm. Of course, the value range of S is not limited to the above, but S≤0.1mm or S≥0.2mm can also be allowed, which is selected according to actual needs.

[0081] In this embodiment, preferably, as follows: Figure 5 As shown, along a direction perpendicular to the first preset direction a, a welding thinning zone 24 is formed on the side of the pole post 2 away from the pole group 11, located on the outer periphery of the mounting through hole 22.

[0082] As can be seen from the structure described above, a groove is opened on the pole post 2 on the outer periphery of the mounting protrusion 42, with the side and top through-grooves. The inner side of the groove near the mounting through-hole 22 is in a through-hole state. This groove is a thinning area, which facilitates through-welding, improves the effect of through-welding, and can also block welding spatter, thus protecting other structures outside the welding area 43.

[0083] It should be noted that the welding thinning zone 24 may not be provided, that is, the groove is not opened on the outside of the pole post 2. The specific choice depends on the actual needs.

[0084] In this embodiment, preferably, as follows: Figure 6 As shown, along the first preset direction a, the depth of the welding thinning region 24 is L1, and 0.5mm. <L1<0.7mm。

[0085] Based on the structure described above, it is clear that if the depth of the weld thinning zone 24 is too small, it will hinder welding and prevent spatter. If the depth of the weld thinning zone 24 is too large, the pole post 2 below the weld thinning zone 24 will be too thin, leading to structural instability after penetration welding. Therefore, the depth L1 of the weld thinning zone 24 should be between 0.5mm and 0.7mm. Of course, the range of L1 is not limited to the above; L1 can also be ≤0.5mm or ≥0.7mm, depending on the actual needs.

[0086] In this embodiment, preferably, as follows: Figure 5 As shown, the width of the weld thinning zone 24 is L0, and 2mm. <L0<3mm。

[0087] Based on the structure described above, if the width of the weld thinning zone 24 is too small, the width of the weld zone 43 will be small, resulting in a small weld area and an unstable and unreliable structure after welding. If the width of the weld thinning zone 24 is too large, the width of the weld zone 43 will be large, resulting in more welding spatter, which will have a greater impact on other parts and is prone to interference. Therefore, the width L0 of the weld thinning zone 24 should be between 2mm and 3mm. Of course, the range of L0 is not limited to the above; L0 can also be ≤2mm or ≥3mm, depending on the actual needs.

[0088] In this embodiment, preferably, as follows: Figure 6 As shown, along the first preset direction aa, the depth of the mounting groove 21 is H, and 4mm. <H<5mm。

[0089] According to the above description, the depth H of the mounting groove 21 is too small, the second connecting member 4 cannot be inserted into place when assembled with the pole column 2, the depth H of the mounting groove 21 is too large, the part penetrated and welded between the pole column 2 and the second connecting member 4 is thin, resulting in low welding strength, and thus the depth H of the mounting groove 21 is in the range of 4-5 mm. Of course, the range of H is not limited to the above, and H can be ≤4 mm or H can be ≥5 mm, which is selected according to actual needs.

[0090] In this embodiment, preferably, as shown in Figure 1 and Figure 2 , along the first preset direction a, the projection of the mounting protrusion 42 falls within the projection of the body 41, and along the direction perpendicular to the first preset direction a, the minimum gap between the edges of the two projections is L, along the direction perpendicular to the first preset direction a, the width of the welding thinning area 24 is L0, and L0

[0091] In this embodiment, preferably, as shown in Figure 1 and Figure 5 , the welding thinning area 24 and the welding area 43 are annular regions.

[0092] According to the above description, the welding thinning area 24 and the welding area 43 are annular, the welding area is larger, the welding area is more evenly distributed, the structure after welding is more firm and stable, and the welding effect is better.

[0093] It should be noted that the welding thinning area 24 and the welding area 43 are not limited to the above-mentioned annular regions, but can also be fan-shaped annular regions, i.e., part of the annular region, or other shaped regions, which are designed according to actual needs.

[0094] In this embodiment, preferably, as shown in Figures 8 to 10 , the battery cell with the split connecting piece further comprises two insulating pieces 5 (the insulating pieces can be plastic pieces, i.e., lower plastic, of course, not limited to this), and the two insulating pieces 5 are arranged on the inner side of the cover plate 1 close to the pole group 11, and are sequentially and spaced apart along the length direction of the cover plate 1. In order to distinguish the above two insulating pieces 5, they are respectively named as the first insulating piece 51 and the second insulating piece 52.

[0095] The cover plate 1 is formed with a first through hole penetrating through two opposite sides thereof along a first preset direction a, and the pole column 2 is installed in the first through hole; along the first preset direction a, the insulating piece 5 located below the pole column 2 is formed with a second through hole corresponding to the first through hole, and plays a role of avoiding the pole column 2. It should be noted that two insulating pieces 5, i.e. a first insulating piece 51 and a second insulating piece 52, are provided in the embodiment.

[0096] According to the structure described above, for the large-capacity and large-size battery cell, the insulating piece 5 is designed in a split body, which can be separately injection molded. For the large-size injection molded part, the flatness of the plastic can be ensured to meet the requirements, and the stress of the insulating piece 5 due to heating and electrolyte soaking process can be released, thereby solving the problem that the stress of the insulating piece 5 affects the downward arch of the center part and causes damage to the pole group 11.

[0097] It should be noted that the number of insulating pieces 5 is not limited to two in the present application, but can also be one, that is, the insulating piece 5 is not designed in a split body, or the number of insulating pieces 5 is more than two, such as three or four, and the like, and is sequentially arranged along the length direction of the cover plate 1.

[0098] In addition, it should be noted that the number of pole columns 2 installed on the same cover plate 1 is not limited to two as described above, but can also be one, which is selected according to actual needs.

[0099] In the embodiment, preferably, as shown in Figures 8 to 13 The battery cell with the split connecting piece further includes an explosion-proof valve 6, the cover plate 1 is formed with an auxiliary through hole penetrating through two opposite sides thereof along the first preset direction a, and the explosion-proof valve 6 is installed in the auxiliary through hole, and the insulating piece 5 located below the explosion-proof valve 6 along the first preset direction a is formed with a first exhaust groove 53 corresponding to the explosion-proof valve 6, a first exhaust through hole 54 is formed in the bottom wall of the first exhaust groove 53, and a second exhaust through hole 55 is formed in the side wall of the first exhaust groove 53.

[0100] According to the structure described above, the first exhaust groove 53 is arranged on the insulating piece 5, the gas inside the battery cell can be introduced into the first exhaust groove 53 through the vertical first exhaust through hole 54 and the horizontal second exhaust through hole 55, and discharged through the explosion-proof valve 6 above the first exhaust groove 53. In particular, in the present application, the first exhaust through hole 54 is along the vertical direction, and the second exhaust through hole 55 is along the horizontal direction, thereby enabling omnidirectional exhaust, improving the exhaust effect during thermal runaway, and improving the safety and reliability of the battery cell.

[0101] Further, preferably, along the length direction of the cover plate 1, the insulation piece 5 located at the opposite sides of the explosion-proof valve 6 are both formed with the air inlet 58, the second exhaust groove 59 and the air guide groove 510 connected in sequence, and the air guide groove 510 extends towards the first exhaust groove 53 and is connected with the first exhaust groove 53. It can be seen that the second exhaust groove 59 and the air guide groove 510 are arranged at other positions of the insulation piece 5, so that the gas at other positions of the battery cell enters the second exhaust groove 59 first, and is quickly exhausted to the first exhaust groove 53 through the air guide groove 510, and then is timely exhausted from the explosion-proof valve 6 above the first exhaust groove 53, so as to achieve the purpose of timely pressure relief, and improve the safety and reliability of the battery during use.

[0102] In this embodiment, preferably, as shown in Figure 14 and Figure 15 , the cover plate 1 is formed with a liquid injection hole 101, and the insulation piece 5 located below the liquid injection hole 101 along the first preset direction a is formed with a liquid blocking groove 56 corresponding to the liquid injection hole 101, and the side wall of the liquid blocking groove 56 is formed with a liquid distribution port 57.

[0103] According to the above described structure, for the high space utilization rate battery cell, in order to avoid the direct impact of the electrolyte on the pole core during liquid injection, the structure of the liquid blocking groove 56 is arranged on the insulation piece 5 in the present application, the electrolyte first acts on the bottom plate of the liquid blocking groove 56 and forms a shunt, and then flows to the pole group 11 from each liquid distribution port 57, thereby completing the liquid injection operation. Of course, it is not limited to this, and the main liquid blocking groove 56 can not be arranged below the liquid injection hole 101, which is selected according to actual needs.

[0104] In this embodiment, preferably, as shown in Figure 8 and to Figure 9 , the battery cell with a split connecting piece further comprises an upper plastic 9, a welding ring 8 and a sealing ring 7; wherein the sealing ring 7 is compressed between the outer side wall of the pole column 2 and the hole wall of the first through hole; the welding ring 8 is sleeved outside the pole column 2 and connected with the pole column 2 by welding; and the upper plastic 9 is wrapped outside the welding ring 8 by injection molding, which plays an insulation protection role. It can be seen that the upper plastic 9 and the welding ring 8 form an integrated compression insulation structure 10, which is more stable and reliable, and the production efficiency is greatly improved.

[0105] In addition, the battery cell with a split connecting piece further comprises a shell 12, and the pole group 11 is arranged in the shell 12.

[0106] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell with a split connecting piece, characterized in that, The cover plate, the pole post, the first connecting member and the second connecting member; wherein the pole post is installed on the cover plate, and the pole post is formed with an installation slot and an installation through hole which are sequentially arranged and connected along a first preset direction, and the installation slot penetrates the inner side of the pole post close to the pole group, and the installation through hole penetrates the outer side of the pole post away from the pole group; The first connecting member is used for connecting the tab cluster of the pole group; the second connecting member includes a body and an installation protrusion, and along the first preset direction, the installation protrusion is arranged on the side of the body away from the pole group, and the body of the second connecting member has no connection relationship with the first connecting member when the material is received and can be independently placed, and the two can be connected by welding when assembled; The body is installed in the installation slot, and the installation protrusion is installed in the installation through hole, and along the first preset direction, the body is formed with a welding area located on the projection outside of the installation protrusion. The first connecting member is formed with a plug hole, and the body is plugged into the plug hole.

2. The battery cell having a split tab according to claim 1, wherein, The first connecting member is a flat plate structure.

3. The battery cell having a split tab according to claim 1, wherein, The number of the pole groups is two, and the two pole groups are sequentially stacked along a second preset direction; the first connecting member is formed with a weight-reducing notch to divide the first connecting member into two connecting parts along the second preset direction, and the two connecting parts are respectively connected with the tab cluster of the corresponding pole group.

4. The battery cell having a split tab according to claim 3, wherein, Along the first preset direction, the second connecting member is arranged on the side of the first connecting member away from the pole group; and / or 5. The battery cell having a split tab according to claim 1, wherein, The body and the installation protrusion are both cylindrical structures; and / or Along the first preset direction, the projection of the installation protrusion falls into the projection of the body, and along the direction perpendicular to the first preset direction, the minimum gap between the edges of the projections of the two is L, and 2mm Along the first preset direction, the height of the installation protrusion is h, and 0.6mm Along the first preset direction, the installation protrusion does not protrude from the pole post, and the height difference between the two is S, and 0.1mm Along the first preset direction, the depth of the installation slot is H, and 4mm The welding area is an annular area around the installation protrusion along the projection of the first preset direction. Along the direction perpendicular to the first preset direction, the side of the pole post away from the pole group is formed with a welding thinning area located on the outer periphery of the installation through hole.

6. The battery cell having a split tab according to claim 1, wherein, Along the first preset direction, the depth of the welding thinning area is L1, and 0.5mm 7. The battery cell having a split tab according to claim 6, wherein, Along the direction perpendicular to the first preset direction, the width of the welding thinning area is L0, and 2mm ​ Along the first preset direction, a projection of the mounting protrusion falls within a projection of the body, and along a direction perpendicular to the first preset direction, a minimum gap between edges of the two projections is L, a width of the welding thinning zone along the direction perpendicular to the first preset direction is L0, and L0 < L; and / or The welding thinning zone and the welding zone are annular regions matched with each other.

8. The battery cell with split tabs of any one of claims 1 to 7, wherein, The battery cell with the split connecting piece further comprises a plurality of insulating pieces, and each of the insulating pieces is arranged on an inner side of the cover plate close to the pole group and is sequentially and spacedly arranged along a length direction of the cover plate; the cover plate is formed with a first through hole penetrating through opposite sides of the cover plate along the first preset direction, and the pole post is mounted in the first through hole; along the first preset direction, the insulating piece below the pole post is formed with a second through hole corresponding to the first through hole.

9. The battery cell having a split tab according to claim 8, wherein, The cover plate is formed with a liquid injection hole, and the insulating piece below the liquid injection hole along the first preset direction is formed with a liquid blocking groove corresponding to the liquid injection hole, and a side wall of the liquid blocking groove is formed with a liquid distribution port.

10. The battery cell having a split tab according to claim 8, wherein, The battery cell with the split connecting piece further comprises an explosion-proof valve, the cover plate is formed with an auxiliary through hole penetrating through opposite sides of the cover plate along the first preset direction, and the explosion-proof valve is mounted in the auxiliary through hole, and the insulating piece below the explosion-proof valve along the first preset direction is formed with a first exhaust groove corresponding to the explosion-proof valve, a bottom wall of the first exhaust groove is formed with a first exhaust through hole, and a side wall of the first exhaust groove is formed with a second exhaust through hole.

11. The battery cell having a split tab according to claim 10, wherein, Along the length direction of the cover plate, the insulating pieces on opposite sides of the explosion-proof valve are each formed with a gas inlet port, a second exhaust groove and a gas guide groove sequentially and continuously connected, the gas guide groove extends towards the first exhaust groove and is in communication with the first exhaust groove. Along the length direction of the cover plate, the insulating pieces on opposite sides of the explosion-proof valve are each formed with a gas inlet port, a second exhaust groove and a gas guide groove sequentially and continuously connected, the gas guide groove extends towards the first exhaust groove and is in communication with the first exhaust groove.

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