A battery cell cover welding overheat protection device and battery cell forming fixture

Abstract

This utility model discloses an overheat protection device for battery cell cover welding and a battery cell forming fixture, including a fixture plate. The fixture plate has terminal limiting holes corresponding to the battery cell cover. A heat-conducting block is placed inside the terminal limiting holes, and an elastic component connects the heat-conducting block to the inner wall of the terminal limiting holes below it. This application adds a heat-conducting block to the lower surface of the area corresponding to the terminal, and an elastic component is provided at the bottom of the heat-conducting block. Under the action of the elastic component, the heat-conducting block can fully contact the terminal of the battery cell cover. The function of the heat-conducting block is to transfer the heat generated during the welding of the tab and the terminal, increasing the volume and weight of the heat absorber, thereby achieving the purpose of cooling the terminal, and also preventing the terminal from sinking due to high temperature.

Description

Technical Field

[0001] This utility model relates to the field of battery cell manufacturing technology, specifically to a battery cell cover plate welding overheat protection device and a battery cell forming tooling. Background Technology

[0002] A battery pack is typically an assembly formed by collecting and welding together the tabs of multiple individual battery cells (wound or stacked). The cover plate terminals are the two conductive terminals extending from the battery cover, representing the positive and negative terminals of the battery. The cover plate terminals and battery pack are connected to safety components on the cover plate, such as explosion-proof valves and flip-over tabs, via internal connecting tabs.

[0003] In the battery cell forming process, during the "tab-cover terminal welding" step, the cover plate is placed face down in the tooling plate, with the bottom of the terminal open. For high current requirements, the welding power and the number of weld lines are often increased, leading to high heat generation during welding. This can cause burns to the cover plate sealing ring or melting of the supporting plastic on the cover plate, ultimately resulting in airtightness failure and even terminal sinking, thus damaging the cover plate. Current solutions attempt to address this issue by increasing the volume of the terminal, but with limited effectiveness. Utility Model Content

[0004] The technical problem to be solved by this utility model is: how to prevent the cover plate electrode lug from being damaged by overheating during welding.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: A battery cell cover welding overheat protection device includes a tooling plate, on which a pole limiting hole corresponding to the battery cell cover is formed. A heat-conducting block is placed in the pole limiting hole, and below the heat-conducting block is connected to the inner wall of the pole limiting hole through an elastic member.

[0006] This application adds a heat-conducting block to the lower surface of the corresponding area of ​​the electrode terminal. The bottom of the heat-conducting block is provided with an elastic component. Under the action of the elastic component, the heat-conducting block can fully contact the electrode terminal of the cell cover plate. The function of the heat-conducting block is to transfer the heat generated when the electrode tab is welded to the electrode terminal, increase the volume and weight of the heat absorber, achieve the purpose of cooling the electrode terminal, and at the same time prevent the electrode terminal from sinking due to high temperature.

[0007] As a further embodiment of this invention, the top of the heat-conducting block can be connected to the electrode terminal on the battery cell cover.

[0008] As a further embodiment of this invention, the elastic component is a spring or a hydraulic rod.

[0009] As a further embodiment of this utility model: the bottom of the tooling plate is screwed into the pole post limiting hole, and the elastic component is detachably connected to the bolt.

[0010] As a further embodiment of this invention, the heat-conducting block is made of copper or aluminum.

[0011] This utility model also discloses a battery cell forming fixture, including the aforementioned battery cell cover plate welding overheat protection device, and at least one set of electrode group limiting mechanisms are provided on the top of the fixture plate and outside the electrode post limiting hole.

[0012] As a further embodiment of this utility model: the pole group limiting mechanism is provided in two sets, and the two sets of pole group limiting mechanisms are symmetrically installed on both sides of the pole post limiting hole.

[0013] As a further embodiment of this utility model: the pole group limiting mechanism includes a mounting base that can be detachably mounted on a tooling plate, a sliding rod that is slidably connected to the bottom of the mounting base, a pole group bottom limiting push block that is detachably connected to the side of the sliding rod facing the pole post limiting hole, and pole group side limiting push blocks that are movably connected to both sides of the pole group bottom limiting push block through a coupling.

[0014] As a further embodiment of this utility model: the end of the slide rod facing the pole post limiting hole is connected to the mounting base through an elastic element.

[0015] As a further embodiment of this utility model: the bottom limiting push block of the pole group is provided with an oblong hole, and the oblong hole is detachably connected to the slide rod.

[0016] Compared with the prior art, the beneficial effects of this utility model are: First, this application adds a heat-conducting block to the lower surface of the corresponding area of ​​the electrode terminal. The bottom of the heat-conducting block is provided with an elastic component. Under the action of the elastic component, the heat-conducting block can fully contact the electrode terminal of the cell cover plate. The function of the heat-conducting block is to transfer the heat generated when the electrode tab is welded to the electrode terminal, increase the volume and weight of the heat absorber, achieve the purpose of cooling the electrode terminal, and at the same time prevent the electrode terminal from sinking due to high temperature. Secondly, this application installs electrode group limiting mechanisms on both sides of the tooling plate. The electrode group limiting mechanisms can limit the electrode group and ensure stability during subsequent welding of the electrode lugs and cover plate poles. Attached Figure Description

[0017] Figure 1 This is an exploded view of the structure of the battery cell cover welding overheat protection device according to an embodiment of this utility model; Figure 2 This is a cross-sectional view of the overheat protection device for the battery cell cover plate welding according to an embodiment of this utility model; Figure 3This is a schematic diagram of the overheat protection device for the battery cell cover plate welding according to an embodiment of the present invention; Figure 4 This is a top view of the overheat protection device for the battery cell cover plate welding according to an embodiment of this utility model; Figure 5 This is a schematic diagram of the structure of the battery cell forming tooling according to an embodiment of the present invention; Explanation of reference numerals in the attached figures: 1. Tooling plate; 11. Handle; 2. Pole post limiting hole; 3. Pole group limiting mechanism; 31. Slider; 32. Mounting base; 33. Pole group bottom limiting push block; 34. Slide rod; 35. Connecting shaft; 36. Pole group side limiting push block; 4. Elastic components; 5. Heat-conducting block; 6. Cell cover plate; 61. Terminal post; 7. Pole assembly base; 8. Pole group; 9. Extreme ear. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. 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 protection scope of this utility model.

[0019] Example 1 Reference Figure 1 A battery cell cover welding overheat protection device includes a tooling plate 1 and two sets of electrode limiting holes 2 opened on the tooling plate 1. The two sets of electrode limiting holes 2 are recessed on the tooling plate 1. The two sets of electrode limiting holes 2 correspond exactly to two electrode terminals 61 on the battery cell cover 6. The welding surface of the electrode terminal 61 faces upward for subsequent welding of connecting pieces, and the back of the electrode terminal 61 faces the electrode limiting hole 2.

[0020] Reference Figure 2 A heat-conducting block 5 is installed inside the electrode limiting hole 2, and an elastic component 4 is provided at the bottom of the heat-conducting block 5; the electrode terminal 61 of the cell cover plate 6 is located at the top of the heat-conducting block 5.

[0021] It should be noted that the function of the heat-conducting block 5 is to transfer heat, increase the volume and weight of the heat absorber, and achieve the purpose of cooling the electrode terminal 61. In order to be compatible with the dimensional tolerances of the electrode terminal 61 and to allow the heat-conducting block 5 to better contact the surface of the electrode terminal 61, an elastic component 4 is provided at the bottom of the heat-conducting block. Specifically, the top cover electrode terminal may have dimensional fluctuations during molding, such as some electrode terminals being thinner. The elastic component 4 designed in this application can ensure that the heat-conducting block 5 fits snugly against the top cover electrode terminal. The heat-conducting block 5 can be made of copper or aluminum, which have good thermal conductivity.

[0022] Among them, the elastic component 4 can be a spring. A bolt is screwed into the pole post limiting hole 2 from the bottom of the tooling plate 1. The spring is sleeved on the outside of the screw for limiting. The length of the screw is less than the length of the spring. The heat-conducting block 5 is connected to the spring. Under the elastic force, the heat-conducting block 5 is made to fit against the top cover pole post.

[0023] The elastic component 4 can also be an elastic hydraulic rod. The top of the hydraulic rod contacts the heat-conducting block 5, and the heat-conducting block 5 fits against the top cover pole under the elastic force. Bolts can be screwed into the pole limiting hole 2 from the bottom of the tooling plate 1 and detachably connected to the hydraulic rod, thereby realizing the limiting of the hydraulic rod.

[0024] Example 2 Reference Figure 1 and Figure 3 This embodiment discloses a battery cell forming fixture, including a fixture plate 1, a terminal post limiting hole 2, a terminal group limiting mechanism 3, an elastic component 4, and a heat-conducting block 5. Handles 11 are installed at both ends of the fixture plate 1. Two sets of terminal group limiting mechanisms 3 are provided, and the two sets of terminal group limiting mechanisms 3 are installed on one side of the terminal post limiting hole 2. The battery cell cover plate 6 is installed above the terminal post limiting hole 2. The terminal group limiting mechanism 3 is used to fix the terminal group 8. After the battery cell cover plate 6 and the terminal group 8 are installed in the required position, the terminal tabs 9 of the terminal group are welded to the battery cell cover plate 6.

[0025] A pole group base 7 is provided on the top of the tooling plate 1 and between the two pole group limiting mechanisms 3. The pole group 8 can be placed on the pole group base 7 when the pole tab 9 and the top cover 6 are welded later.

[0026] The pole group limiting mechanism 3 includes a slider 31, a mounting base 32, a bottom limiting push block 33, a sliding rod 34, a connecting shaft 35, and a side limiting push block 36. The mounting base 32 is detachably mounted to the tooling plate 1 by bolts or pins. A groove is provided on the tooling plate 1 outside the mounting base 32. The slider 31 slides in the groove. One side of the slider 31 is connected to the sliding rod 34. The sliding rod 34 passes through the mounting base 32 and is detachably connected to the bottom limiting push block 33. A spring is also connected between the side of the sliding rod 34 facing the middle of the tooling plate 1 and the mounting base 32. The two ends of the side of the sliding rod 34 facing the middle of the tooling plate 1 are movably connected to the side limiting push block 36 of the pole group through the connecting shaft 35. Therefore, the slider 31 is moved towards the tooling plate 1 by external manual or power drive. At this time, the slide rod 34 drives the bottom limit push block 33 of the electrode group to move towards the bottom of the cell. Simultaneously, driven by the connecting shaft 35, the two side limit push blocks 36 of the electrode group move towards the sides of the cell. Finally, the bottom limit push block 33 of the electrode group and the two side limit push blocks 36 of the electrode group simultaneously limit the electrode group 8 from three directions. The state at this time is as follows. Figure 5 As shown.

[0027] It should be noted that the bottom limiting push block 33 of the pole group has an oblong hole, and the slide rod 34 has a threaded hole that connects to the bottom limiting push block 33 of the pole group. A bolt can be passed through the oblong hole of the bottom limiting push block 33 of the pole group to connect to the threaded hole on the slide rod 34. The oblong hole is designed to finely adjust the position of the bottom limiting push block 33 of the pole group, which can be adjusted according to the size of the pole group 8.

[0028] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended 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 battery cell cover welding overheat protection device, comprising a tooling plate, characterized in that, The tooling plate has electrode positioning holes corresponding to the battery cell cover plate. A heat-conducting block is placed in the electrode positioning hole, and the heat-conducting block is connected to the inner wall of the electrode positioning hole through an elastic component below it.

2. The overheat protection device for battery cell cover welding according to claim 1, characterized in that: The top of the heat-conducting block can contact the electrode terminals on the cell cover.

3. The overheat protection device for battery cell cover welding according to claim 1, characterized in that: The elastic component is a spring or a hydraulic rod.

4. The overheat protection device for battery cell cover welding according to claim 3, characterized in that: The bottom of the tooling plate is screwed into the pole post limiting hole, and the elastic component is detachably connected to the bolt.

5. The overheat protection device for cell cover welding according to claim 1, characterized in that: The heat-conducting block is made of copper or aluminum.

6. A battery cell forming tooling, characterized in that, The device includes the cell cover welding overheat protection device as described in any one of claims 1-5, wherein at least one set of electrode group limiting mechanisms is provided on the top of the tooling plate and outside the electrode post limiting hole.

7. The battery cell forming fixture according to claim 6, characterized in that: The pole group limiting mechanism is provided in two sets, and the two sets of pole group limiting mechanisms are symmetrically installed on both sides of the pole post limiting hole.

8. The battery cell forming fixture according to claim 6, characterized in that: The pole group limiting mechanism includes a mounting base that can be detachably mounted on a tooling plate. A sliding rod is slidably connected to the bottom of the mounting base. A bottom limiting push block of the pole group is detachably connected to the side of the sliding rod facing the pole post limiting hole. Side limiting push blocks of the pole group are movably connected to both sides of the bottom limiting push block of the pole group through a coupling.

9. A cell forming fixture according to claim 8, characterized in that: The end of the slide bar facing the pole post limiting hole is connected to the mounting base through an elastic element.

10. A cell forming fixture according to claim 8, characterized in that: The bottom limiting push block of the pole group has an oblong hole, and the oblong hole is detachably connected to the slide rod by bolts.

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