An electrode lug welding anti-cutting cell cover plate and battery

Abstract

The utility model relates to battery technology field provides a kind of pole lug welding anti-cutting battery cell cover plate and battery, the cell cover plate includes lower plastic main body and lower plastic connecting piece, along X direction, the side of the welding area of lower plastic main body corresponding to pole lug is provided with empty slot, X direction is same with the width direction of the lower plastic main body;Lower plastic connecting piece is detachably connected in empty slot;Through the empty slot design of lower plastic main body, pole lug welding area is in unshielded state when welding, so that in welding process, pole lug can be freely placed in empty slot, avoid being cut by lower plastic edge;So without increasing the thickness of pole post bottom plate to ensure that it is higher than lower plastic edge, reduce the amount of metal material and cover plate cost;Lower plastic connecting piece is detachably connected in empty slot, after welding is completed, lower plastic connecting piece is assembled at empty slot again, so that lower plastic restores integral structure, ensure the insulation performance and mechanical strength of cover plate, do not affect the overall function of cover plate.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a cell cover plate with anti-cutting electrode tabs and a battery. Background Technology

[0002] Currently, in the welding process between the cell cover and the electrode assembly tabs, tooling is typically used to fix the cover and the tabs. The core structure of existing technology includes the cover's electrode post, the lower plastic component, and the tab. The electrode post base plate needs to be flush with or even higher than the edge of the lower plastic component at the welding point to avoid damage to the tab during welding; the relative height relationship between the two directly affects the welding quality. During welding, the tab is located between the electrode post base plate and the edge of the lower plastic component, and pressure is applied to the tab through a welding nozzle to achieve connection with the electrode post. If the height difference between the electrode post base plate and the edge of the lower plastic component is not properly controlled, it will directly lead to damage to the tab.

[0003] In the existing technology, in order to ensure that the base plate of the pole is higher than the edge of the lower plastic, the thickness of the base plate of the pole needs to be designed to be much greater than the actual welding thickness to meet the height requirements. This design leads to a significant increase in the amount of metal material used, especially in large-scale production, which greatly increases the cost of the pole. Furthermore, when the base plate of the electrode post is lower than the edge of the lower plastic, during the pressing process of welding the copper nozzle, the edge of the lower plastic will directly squeeze the electrode tab. The electrode tab is usually made of thin metal foil such as copper foil or aluminum foil, which has low strength. The hard compression of the lower plastic edge will cause problems such as tearing and damage to the electrode tab.

[0004] Therefore, under the current circumstances, it is difficult to balance cost and reliability when matching the height of the lower plastic edge with the base plate of the electrode post. If the thickness of the base plate of the electrode post is reduced in pursuit of low cost, the risk of the electrode tab being cut will increase dramatically; if the thickness of the base plate of the electrode post is increased in order to protect the electrode tab, the cost will get out of control. Utility Model Content

[0005] This utility model provides a cell cover plate and battery with anti-cut welding tabs, which solves the defects of the prior art in the welding process of cell cover plate and electrode group tabs, which has the risk of tab cutting and damage.

[0006] In a first aspect, this utility model provides a cut-resistant cover plate for electrode tab welding, comprising: The lower plastic body has an anti-cavity groove on one side of the lower plastic body corresponding to the welding area of ​​the electrode tab along the X direction; The lower plastic connector is detachably connected to the clearance groove, and the X direction is the same as the width direction of the lower plastic body.

[0007] According to the present invention, a cut-resistant cover plate for electrode welding is provided, wherein the lower plastic body has the following on both sides along the X direction: First side baffle; The second side baffle is less in height than the first side baffle, and the clearance groove is provided on the second side baffle.

[0008] According to the present invention, a cut-resistant electrode welding cover plate for a battery cell is provided, wherein a first connection structure is provided between the lower plastic connector and the clearance groove, the first connection structure comprising: A positioning groove is provided at the bottom of the clearance groove; A positioning boss is provided at the bottom of the lower plastic connector, and the positioning boss is adapted to the positioning groove.

[0009] According to the present invention, a cut-resistant electrode cover plate for welding electrode tabs is provided, wherein a second connection structure is further provided between the lower plastic connector and the clearance groove, the second connection structure comprising: Assembly protrusions are provided at both ends of the lower plastic connector along the length direction of the lower plastic connector; The assembly groove is provided on both sides of the clearance groove along the Y direction, so that when the positioning boss and the positioning groove are engaged, the assembly protrusion is adapted to the assembly groove, and the Y direction is the same as the length direction of the lower plastic body.

[0010] According to the present invention, a cut-resistant electrode cover plate for welding electrode tabs is provided, wherein a second connection structure is further provided between the lower plastic connector and the clearance groove, the second connection structure comprising: Assembly grooves are provided at both ends of the lower plastic connector; Assembly protrusions are provided on both sides of the clearance groove, so that when the positioning boss and the positioning groove are engaged, the assembly groove and the assembly protrusion are adapted to each other.

[0011] According to the present invention, a electrode welding anti-cutting battery cell cover plate is provided, which further includes an electrode post and an electrode post base plate. The electrode post and the electrode post base plate are integrally formed. The electrode post abuts against the lower plastic body, and the height of the electrode post base plate along the Z direction is not lower than the height of the clearance groove. The Z direction is the same as the thickness direction of the lower plastic body.

[0012] According to the present invention, a electrode tab welding anti-cutting cell cover plate is provided, wherein the height difference H between the clearance groove and the electrode post base plate along the Z direction is ≥0.2mm.

[0013] According to the present invention, when the lower plastic connector is installed in the clearance groove, the top surface of the lower plastic connector is flush with the top surface of the second side baffle along the Z direction.

[0014] According to the present invention, a electrode tab welding anti-cutting battery cell cover plate is provided, wherein the lower plastic body and the lower plastic connector are both made of plastic material.

[0015] Secondly, this utility model provides a battery, including a cut-resistant cell cover plate with electrode tabs as described in the first aspect.

[0016] This utility model provides a cut-resistant cell cover and battery for electrode welding. Through the design of a recessed groove in the lower plastic body, the electrode welding area is unobstructed during welding, eliminating the risk of compression of the electrode by the edge of the traditional integral lower plastic. This allows the electrode to be freely placed within the recessed groove during welding, preventing cuts from the lower plastic edge. Therefore, there is no need to increase the thickness of the electrode base plate to ensure it is higher than the lower plastic edge, reducing the amount of metal used and the cost of the cover. The lower plastic connector is detachably connected to the recessed groove. After welding, the lower plastic connector is reassembled in the recessed groove, restoring the lower plastic to its overall structure, ensuring the insulation performance and mechanical strength of the cover without affecting its overall function.

[0017] In addition, the clearance groove provides direct operating space for welding copper nozzles. The tooling fixture can position the pole through the clearance groove, avoiding positioning deviation caused by the lower plastic covering. This greatly improves the yield rate of the welding process and shortens the welding time. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a structural schematic diagram of the lower plastic connector provided in an embodiment of the present utility model.

[0020] Figure 2 This is a front view of a electrode tab welding anti-cutting battery cell cover provided in an embodiment of this utility model.

[0021] Figure 3 This is an isometric view of a electrode tab welding anti-cutting battery cell cover provided in an embodiment of this utility model.

[0022] Figure 4 This is a partial enlarged view of the air-avoidance groove provided in an embodiment of this utility model.

[0023] Figure label: 1. Lower plastic body; 2. Lower plastic connector; 3. First side baffle; 4. Second side baffle; 5. Positioning groove; 6. Positioning boss; 7. Assembly protrusion; 8. Assembly groove; 9. Pole post base plate; 10. Void avoidance groove. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] The following is combined with Figures 1-4 This invention describes a electrode tab welding anti-cut cell cover plate and battery.

[0026] like Figures 1-2 As shown, this utility model provides a cut-resistant battery cell cover for electrode welding, including a lower plastic body 1 and a lower plastic connector 2. A clearance groove 10 is provided on one side of the upper and lower plastic bodies 1 corresponding to the welding area of ​​the electrode along the X direction. The lower plastic connector 2 is detachably connected to the clearance groove 10. The X direction is set to be the same as the width direction of the lower plastic body, the Y direction is the same as the length direction of the lower plastic body, and the Z direction is the same as the thickness direction of the lower plastic body.

[0027] As can be seen from the above solution, this utility model, through the design of the clearance groove 10 in the lower plastic body 1, ensures that the electrode welding area is unobstructed during welding, eliminating the risk of the edge of the traditional integral lower plastic extruding the electrode. This allows the electrode to be freely placed in the clearance groove 10 during welding, avoiding being cut by the edge of the lower plastic. Thus, it is not necessary to increase the thickness of the electrode base plate 9 to ensure that it is higher than the edge of the lower plastic, reducing the amount of metal material used and the cost of the cover plate. The lower plastic connector 2 is detachably connected to the clearance groove 10. After welding, the lower plastic connector 2 is then assembled in the clearance groove 10, restoring the lower plastic to its overall structure, ensuring the insulation performance and mechanical strength of the cover plate, and not affecting the overall function of the cover plate.

[0028] In addition, the clearance groove 10 provides direct operating space for welding copper nozzles. The tooling fixture can position the pole through the clearance groove 10, avoiding positioning deviation caused by the lower plastic covering. The yield rate of the welding process is greatly improved, and the welding time is shortened.

[0029] In this embodiment, both the lower plastic body 1 and the lower plastic connector 2 are made of plastic material.

[0030] This utility model adopts a split lower plastic structure. The lower plastic body 1 serves to fix the pole and provide tooling positioning space. The lower plastic connector 2 is specifically used for structural repair after welding. Compared with the integral lower plastic in the prior art, welding and structural support are taken into account at the same time.

[0031] In this embodiment, the lower plastic body 1 is provided with a first side baffle 3 and a second side baffle 4 on both sides along the X direction. The height of the second side baffle 4 is less than that of the first side baffle 3, and the clearance groove 10 is provided on the second side baffle 4.

[0032] like Figure 1 , Figure 4 As shown, a first connection structure is provided between the lower plastic connector 2 and the clearance groove 10. The first connection structure includes: a positioning groove 5 and a positioning boss 6. The positioning groove 5 is located at the bottom of the clearance groove 10; the positioning boss 6 is located at the bottom of the lower plastic connector 2, and the positioning boss 6 is adapted to the positioning groove 5.

[0033] This design, through the matching design of the positioning boss 6 and the positioning groove 5 between the lower plastic connector 2 and the clearance groove 10, allows the lower plastic connector 2 to be automatically aligned by the mechanical structure during assembly, avoiding manual calibration errors. Precise positioning ensures that the edges of the lower plastic connector 2 and the clearance groove 10 fit seamlessly, avoiding stress concentration caused by assembly deviations. After assembly, it also ensures the flatness of the lower plastic connector 2 and the lower plastic body 1, preventing assembly misalignment. At the same time, it also enhances the reliability of the connection, preventing the lower plastic connector 2 from falling off. After the boss is inserted into the groove, it forms a mechanical lock, preventing the lower plastic connector 2 from loosening during use after welding, and ensuring the long-term stability of the cover plate's insulation performance.

[0034] Preferably, the opening of the positioning groove 5 is provided with a guide slope to give it a certain guiding function. During assembly, the positioning boss 6 can automatically slide in along the guide slope of the positioning groove 5, reducing tooling alignment time and improving assembly efficiency.

[0035] In this embodiment, the lower plastic connector 2 is a long strip structure, and the length of the positioning protrusion is less than the length of the lower plastic connector 2. Preferably, the positioning protrusion is centrally located at the bottom of the lower plastic connector 2.

[0036] In a further embodiment, a second connection structure is also provided between the lower plastic connector 2 and the clearance groove 10. The second connection structure includes: an assembly protrusion 7 and an assembly groove 8. The assembly protrusion 7 is provided at both ends of the lower plastic connector 2 along the length direction of the lower plastic connector 2. The assembly groove 8 is provided on both sides of the clearance groove 10 along the Y direction, so that when the positioning boss 6 and the positioning groove 5 are engaged, the assembly protrusion 7 and the assembly groove 8 are adapted to each other.

[0037] This design provides clear guidance for the assembly process. By first inserting the bottom positioning boss 6 and then fastening the assembly protrusions 7 at both ends, the positioning boss 6 and the positioning groove 5 are initially positioned. Then, the assembly protrusions 7 are inserted into the assembly groove 8 to form a secondary mechanical lock, further enhancing the connection reliability and strength between the lower plastic body 1 and the lower plastic connector 2. The symmetrical design of the assembly protrusions 7 and the assembly groove 8 at both ends ensures that the lower plastic connector 2 is subjected to balanced forces after connection, resulting in a stable and reliable connection. This significantly improves the long-term reliability of the cover plate structure. During the use of the welded cover plate, it can effectively prevent the connector from falling off due to external forces such as vibration and compression, avoiding the risk of short circuit caused by exposed tabs.

[0038] In other embodiments, a second connection structure is further provided between the lower plastic connector 2 and the clearance groove 10. The second connection structure includes an assembly groove 8 and an assembly protrusion 7. The assembly groove 8 is provided at both ends of the lower plastic connector 2 along the length direction of the lower plastic connector 2. The assembly protrusion 7 is provided on both sides of the clearance groove 10 along the Y direction, so that when the positioning boss 6 and the positioning groove 5 are engaged, the assembly groove 8 and the assembly protrusion 7 are adapted to each other.

[0039] This design provides clear guidance for the assembly process. By first inserting the bottom positioning boss 6 and then fastening the assembly protrusions 7 at both ends, the positioning boss 6 and the positioning groove 5 are initially positioned. Then, the assembly protrusions 7 are inserted into the assembly groove 8 to form a secondary mechanical lock, further enhancing the connection reliability and strength between the lower plastic body 1 and the lower plastic connector 2. The symmetrical design of the assembly protrusions 7 and the assembly groove 8 at both ends ensures that the lower plastic connector 2 is subjected to balanced forces after connection, resulting in a stable and reliable connection. This significantly improves the long-term reliability of the cover plate structure. During the use of the welded cover plate, it can effectively prevent the connector from falling off due to external forces such as vibration and compression, avoiding the risk of short circuit caused by exposed tabs.

[0040] Preferably, the inner walls of the positioning groove 5 and the assembly groove 8 are provided with anti-slip textures to ensure that the connection between the lower plastic connector 2 and the lower plastic body 1 will not loosen in environments with vibration or temperature changes.

[0041] Reference Figure 2 In this embodiment, the pole post and pole post base plate 9 are also included. The pole post and pole post base plate 9 are integrally formed. The pole post abuts against the lower plastic body 1, and the height of the pole post base plate 9 along the Z direction is not lower than the height of the clearance groove 10, such as the height difference H between the clearance groove 10 and the pole post base plate 9 is ≥0.2mm.

[0042] With this configuration, the height difference H between the pole base plate 9 and the clearance groove 10 is ≥0.2mm, providing positioning space for the tooling fixture and preventing the pole from having no offset or the offset amount from meeting the requirements during subsequent pole riveting.

[0043] Reference Figure 3 In this embodiment, after the lower plastic connector 2 is installed in the clearance groove 10, the top surface of the lower plastic component is flush with the top surface of the second side baffle 4 along the Z direction. This arrangement ensures that after the lower plastic connector 2 is installed in the clearance groove 10, the lower plastic connector 2 and the second side baffle 4 form a continuous and smooth surface, eliminating steps or protrusions that may exist in traditional split structures. The flush top surface makes the lower plastic component and the side baffle form a unified stress-bearing surface. When subjected to external pressure such as the pressure of battery cell stacking, the stress can be evenly distributed throughout the area, avoiding localized stress concentration caused by non-flush structures, which can lead to cracking. It also ensures the overall flatness of the cover plate after assembly.

[0044] This utility model also provides a battery, including the above-mentioned electrode tab welded anti-cut cell cover plate.

[0045] In addition, it also includes a housing and a core package. The core package is set inside the housing, the cell cover is fastened to the housing, and the lower plastic body 1 is set between the cover and the core package. It should be noted that the housing and the core package are products of the prior art, and their structure and principle are not the focus of this article, so they will not be elaborated here.

[0046] Because the battery uses the aforementioned anti-cut cell cover with welded tabs, it adopts a split lower plastic structure. The lower plastic body 1 serves to fix the electrode post and provide tooling positioning space. The lower plastic connector 2 is specifically used for structural repair after welding. Compared with the integral lower plastic in the prior art, welding and structural support are taken into account at the same time. Through the design of the clearance groove 10 in the lower plastic body 1, the electrode welding area is in an unobstructed state during welding, eliminating the risk of the edge of the traditional integral lower plastic pressing on the electrode. During the welding process, the electrode can be freely placed in the clearance groove 10 to avoid being cut by the edge of the lower plastic. Therefore, it is not necessary to increase the thickness of the electrode post base plate 9 to ensure that it is higher than the edge of the lower plastic, reducing the amount of metal material used and the cost of the cover. The lower plastic connector 2 is detachably connected to the clearance groove 10. After welding, the lower plastic connector 2 is assembled in the clearance groove 10 to restore the integral structure of the lower plastic, ensuring the insulation performance and mechanical strength of the cover, without affecting the overall function of the cover.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A electrode tab welded to prevent cuts on the battery cell cover, characterized in that, include: The lower plastic body has an anti-cavity groove on one side of the lower plastic body corresponding to the welding area of ​​the electrode tab along the X direction, and the X direction is the same as the width direction of the lower plastic body. The lower plastic connector is detachably connected to the clearance groove.

2. The electrode tab welding anti-cut cell cover plate according to claim 1, characterized in that, The lower plastic body has the following on both sides along the X direction: First side baffle; The second side baffle is less in height than the first side baffle, and the clearance groove is provided on the second side baffle.

3. The electrode tab welding anti-cut cell cover plate according to claim 2, characterized in that, A first connection structure is provided between the lower plastic connector and the clearance groove, the first connection structure comprising: A positioning groove is provided at the bottom of the clearance groove; A positioning boss is provided at the bottom of the lower plastic connector, and the positioning boss is adapted to the positioning groove.

4. The electrode tab welding anti-cut cell cover plate according to claim 3, characterized in that, A second connection structure is further provided between the lower plastic connector and the clearance groove, the second connection structure including: Assembly protrusions are provided at both ends of the lower plastic connector along the length direction of the lower plastic connector; The assembly groove is provided on both sides of the clearance groove along the Y direction, so that when the positioning boss and the positioning groove are engaged, the assembly protrusion is adapted to the assembly groove, and the Y direction is the same as the length direction of the lower plastic body.

5. A electrode tab welding anti-cut battery cell cover plate according to claim 3, characterized in that, A second connection structure is further provided between the lower plastic connector and the clearance groove, the second connection structure including: Assembly grooves are provided at both ends of the lower plastic connector; Assembly protrusions are provided on both sides of the clearance groove, so that when the positioning boss and the positioning groove are engaged, the assembly groove and the assembly protrusion are adapted to each other.

6. A electrode tab welding anti-cutting battery cell cover plate according to any one of claims 2-5, characterized in that, It also includes an electrode post and an electrode post base plate, the electrode post and the electrode post base plate are integrally formed, the electrode post abuts against the lower plastic body, and the height of the electrode post base plate along the Z direction is not lower than the height of the clearance groove, the Z direction is the same as the thickness direction of the lower plastic body.

7. A electrode tab welding anti-cutting battery cell cover plate according to claim 6, characterized in that, The height difference H between the clearance groove and the pole base plate along the Z direction is ≥0.2mm.

8. A electrode tab welding anti-cutting battery cell cover plate according to claim 6, characterized in that, After the lower plastic connector is installed in the clearance groove, the top surface of the lower plastic connector is flush with the top surface of the second side baffle along the Z direction.

9. A electrode tab welding anti-cutting battery cell cover plate according to claim 1, characterized in that, Both the lower plastic body and the lower plastic connector are made of plastic.

10. A battery, characterized in that, Including the electrode tab welding anti-cut cell cover plate as described in any one of claims 1-9.

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