Integrated cover plate structure and battery pack

Abstract

The utility model discloses an integrated cover plate structure and battery pack, integrate including: tray, the tray has recess, is equipped with at least one elastic structure in the both sides of recess, pole piece, the pole piece places in recess, and the both sides of pole piece respectively with the elastic structure of recess both sides are opposite. The utility model guarantees that pole piece can be in the recess intermediate position of tray or be inclined to recess inside when welding, and can absorb the expansion or compression of module, prevent integrated cover plate stress arch, or fracture, reduce the stress of battery cell pole and pole piece weld.

Description

Technical Field

[0001] This utility model relates to the technical field of battery packs, and in particular to an integrated cover structure and battery pack. Background Technology

[0002] Currently, in power battery packs, the CTP (Continuous Packaging) module structure involves multiple cells placed directly into the housing without end plates or side plates. The housing beams provide pre-tension to prevent cell movement. With this structure, if the cell terminals are on both sides, welding is required before placement into the housing. Because of manufacturing tolerances in the spacing of the housing beams, the module's length may be compressed or expanded after placement, causing the integrated cover to arch under stress or break.

[0003] Towards the end of the battery pack's lifespan, as the number of charge-discharge cycles increases, the cell surfaces begin to bulge, and the module's expansion force gradually increases. This may cause the cell's electrode to shift relative to other cells. If the electrode cannot move relative to the tray, the weld between the cell and the electrode, as well as the tray, will be subjected to significant expansion force, leading to weld damage or tray breakage. Utility Model Content

[0004] To address the aforementioned problems with existing electrode and tray connection structures, this paper aims to provide an integrated cover structure and battery pack.

[0005] The specific technical solution is as follows:

[0006] An integrated cover structure, comprising:

[0007] A tray having a groove, with at least one elastic structure on each side of the groove;

[0008] An electrode is placed in the groove, and the two sides of the electrode abut against the elastic structures on both sides of the groove, so that the electrode is located in the middle of the groove.

[0009] In the aforementioned integrated cover plate structure, when the electrode is placed in the groove, there are gaps between the two sides of the electrode and the two sides of the groove respectively; the elastic structure, through its own elastic force, causes it to at least partially protrude from the sidewall of the groove and abut against the sidewall of the electrode.

[0010] In the aforementioned integrated cover plate structure, the groove has at least one positioning post, and the electrode has at least one sliding groove. When the electrode is placed in the groove, the positioning post and the sliding groove slide together, and the direction of sliding is the elastic direction of the elastic structure.

[0011] In the aforementioned integrated cover structure, the tray is provided with at least two baffles, and a groove is formed between two adjacent baffles. At least one elastic structure is provided on the side of the baffle near the groove.

[0012] The baffle has at least one receiving space for accommodating at least a portion of the elastic structure.

[0013] In the aforementioned integrated cover structure, at least two of the elastic structures are provided on the same sidewall of the groove.

[0014] In the aforementioned integrated cover structure, the end of the positioning post is hot-riveted; or the end of the positioning post has a snap fastener.

[0015] In the above-mentioned integrated cover plate structure, each end of the electrode sheet is provided with at least one sliding groove, and each end of the groove is provided with at least one positioning post, wherein the sliding groove and the positioning post are slidably engaged.

[0016] When a groove is provided at both ends of the electrode, the two grooves are located at opposite corners of the electrode.

[0017] In the aforementioned integrated cover structure, when the tray is placed horizontally, the opening of the groove faces upward, and the upper surface of the electrode sheet inside the groove is lower than the upper surface of the baffle.

[0018] In the aforementioned integrated cover structure, the tray has a plurality of grooves and a plurality of baffles, the plurality of grooves and the plurality of baffles are distributed at intervals, and the elastic structure is provided on both sides of the baffles.

[0019] A battery pack includes at least one battery cell, wherein it further includes an integrated cover structure as described above, wherein the electrode is connected to the terminal post of the battery cell.

[0020] The positive effects of the above technical solution compared with the existing technology are:

[0021] This invention ensures that the electrode sheet is positioned in the middle of the tray's groove or biased towards one side of the groove during welding, and can absorb the expansion or compression of the module, preventing the integrated cover plate from arching or breaking under stress, and reducing the stress on the weld between the cell's terminal post and the electrode sheet. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of an integrated cover plate structure according to the present invention;

[0023] Figure 2 This utility model relates to an integrated cover plate structure. Figure 1 A magnified view of a portion of the image;

[0024] Figure 3 This utility model relates to an integrated cover plate structure. Figure 2 A magnified view of a portion of the image;

[0025] Figure 4 This is an enlarged view of the tray structure in an integrated cover plate structure of this utility model;

[0026] Figure 5 This utility model relates to an integrated cover plate structure. Figure 4 A magnified view of a portion of the image;

[0027] Figure 6 This is an enlarged view of the electrode sheet in an integrated cover plate structure of this utility model;

[0028] In the attached diagram: 1. Tray; 2. Electrode; 3. Groove; 4. Elastic structure; 5. Baffle; 6. Accommodation space; 7. Positioning post; 8. Slide groove; 41. Elastic rod; 42. Elastic protrusion. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0030] like Figures 1 to 6 As shown, an integrated cover structure of a preferred embodiment is illustrated, including: a tray 1 and an electrode 2. The tray 1 has a groove 3, and at least one elastic structure 4 is provided on both sides of the groove 3. The electrode 2 is placed in the groove 3, and the two sides of the electrode 2 abut against the elastic structures 4 on both sides of the groove 3, so that the electrode 2 is located in the middle of the groove 3 or biased towards one side of the groove 3.

[0031] Furthermore, as a preferred embodiment, when the electrode 2 is placed in the groove 3, there is a gap H between the two sides of the electrode 2 and the two sides of the groove 3 respectively; the elastic structure 4, through its own elasticity, makes itself at least partially protrude from the side wall of the groove 3 and abut against the side wall of the electrode 2.

[0032] The elastic structures 4 located on both sides of the groove 3 of this utility model abut against both sides of the electrode 2, so that the electrode 2 is in the middle position of the groove 3 or biased towards one side of the groove 3. This can absorb the expansion or compression of the module, prevent the integrated cover plate from arching or breaking under force, and reduce the stress on the weld between the cell post and the electrode.

[0033] Furthermore, as a preferred embodiment, the tray 1 is provided with at least two baffles 5, and a groove 3 is formed between two adjacent baffles 5. At least one elastic structure 4 is provided on the side of the baffle 5 near the groove 3.

[0034] Furthermore, as a preferred embodiment, the baffle 5 has at least one receiving space 6 for accommodating at least a portion of the elastic structure 4. When the electrode 2 in the groove 3 expands, both sides of the electrode 2 extend toward the two baffles 5 respectively, filling the gap H on both sides of the electrode 2 and squeezing the elastic structure 4 into the receiving space 6, preventing the integrated cover plate from arching or breaking under stress, and reducing the stress on the weld between the cell electrode post and the electrode 2.

[0035] The above are merely preferred embodiments of the present invention and are not intended to limit the implementation methods and protection scope of the present invention.

[0036] Based on the above, this utility model also has the following embodiments:

[0037] For further embodiments of this utility model, please refer to... Figures 1 to 6 As shown, the groove 3 has at least one positioning post 7, and the electrode 2 has at least one sliding groove 8. When the electrode 2 is placed in the groove 3, the positioning post 7 and the sliding groove 8 slide together, and the direction of sliding is the elastic direction of the elastic structure 4.

[0038] In a further embodiment of the present invention, at least one sliding groove 8 is provided at both ends of the electrode 2, and at least one positioning post 7 is provided at both ends of the groove 3, with the sliding groove 8 and the positioning post 7 slidingly engaged.

[0039] In a further embodiment of this utility model, when both ends of the electrode 2 are provided with a sliding groove 8, the two sliding grooves 8 are located at opposite corners of the electrode 2.

[0040] Preferably, the groove 8 is an oblong hole.

[0041] Preferably, the length direction of the groove 8 extends along the width direction of the groove 3.

[0042] In a further embodiment of this utility model, the elastic structure 4 is disposed at the opening of the accommodating space 6.

[0043] Preferably, the elastic structure 4 is installed on one side of the opening of the receiving space 6, or the elastic structure 4 is installed on both sides of the opening of the receiving space 6.

[0044] Preferably, each elastic structure 4 includes at least one elastic rod 41 and at least one elastic protrusion 42. One end of the elastic rod 41 is connected to one side of the opening of the receiving space 6, and the elastic protrusion 42 is connected to the other end of the elastic rod 41, with the elastic protrusion 42 positioned close to the groove 3. The elastic force of the elastic rod 41 causes the elastic protrusion 42 to abut against the side wall of the electrode 2. When the electrode 2 in the groove 3 expands, the side wall of the electrode 2 compresses the elastic protrusion 42 and drives the elastic rod 41, causing both the elastic protrusion 42 and the elastic rod 41 to move into the receiving space 6.

[0045] In a further embodiment of this invention, at least two elastic structures 4 are provided on the same sidewall of the groove 3. The at least two elastic structures 4 on the same side are distributed along the length direction of the electrode 2.

[0046] In a further embodiment of this utility model, the end of the positioning post 7 is hot-riveted to deform the end of the positioning post 7. The deformed structure is limited and matched with the upper surface of the electrode 2 along the axial direction of the positioning post 7, and at the same time, the electrode 2 and the positioning post 7 can slide along the length direction of the slide groove 8.

[0047] Alternatively, the end of the positioning post 7 is provided with a buckle, which passes through the slide groove 9 through its own elasticity and is matched with the upper surface of the electrode 2 along the axial direction of the positioning post 7. At the same time, it can also enable the electrode 2 and the positioning post 7 to slide along the length direction of the slide groove 8.

[0048] In a further embodiment of the present invention, the tray 1 has a plurality of grooves 3 and a plurality of baffles 5, the plurality of grooves 3 and the plurality of baffles 5 are distributed at intervals, and the baffles 5 are provided with elastic structures 4 on both sides.

[0049] In a further embodiment of this invention, when the tray 1 is placed horizontally, the opening of the groove 3 faces upward, and the upper surface of the electrode 2 inside the groove 3 is lower than the upper surface of the baffle 5. This increases the electrical clearance and creepage distance between adjacent electrode 2.

[0050] Preferably, electrode 2 is an aluminum electrode.

[0051] This utility model also shows a battery pack, including at least one battery cell, and the aforementioned integrated cover structure, wherein the electrode 2 is welded to the terminal post of the battery cell.

[0052] This invention can position the electrode sheet before welding. By using an elastic structure to position the electrode sheet, it ensures that the electrode sheet is in the middle of the groove of the tray during welding. It can also absorb the expansion or compression of the module, prevent the integrated cover plate from arching or breaking under stress, reduce the stress on the weld between the cell terminal and the electrode sheet, and extend the battery pack life.

[0053] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model. Those skilled in the art should realize that all solutions obtained by equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An integrated cover plate structure, characterized in that, include: A tray having a groove, with at least one elastic structure on each side of the groove; An electrode is placed in the groove, and the two sides of the electrode abut against the elastic structures on both sides of the groove.

2. The integrated cover plate structure according to claim 1, characterized in that, When the electrode is placed in the groove, there are gaps between the two sides of the electrode and the two sides of the groove respectively; at least a portion of the elastic structure protrudes from the sidewall of the groove and abuts against the sidewall of the electrode.

3. The integrated cover plate structure according to claim 1, characterized in that, The groove has at least one positioning post, and the electrode has at least one sliding groove. When the electrode is placed in the groove, the positioning post and the sliding groove slide together, and the direction of sliding is the elastic direction of the elastic structure.

4. The integrated cover plate structure according to claim 1, characterized in that, The tray is provided with at least two baffles, and a groove is formed between two adjacent baffles. At least one elastic structure is provided on the side of the baffles near the groove. The baffle has at least one receiving space for accommodating at least a portion of the elastic structure.

5. The integrated cover plate structure according to claim 1, characterized in that, At least two of the elastic structures are provided on the same sidewall of the groove.

6. The integrated cover plate structure according to claim 3, characterized in that, The end of the positioning post is hot-riveted; or the end of the positioning post has a snap fastener.

7. The integrated cover plate structure according to claim 3, characterized in that, At least one sliding groove is provided at both ends of the electrode sheet, and at least one positioning post is provided at both ends of the groove, with the sliding groove and the positioning post slidingly engaged; When a groove is provided at both ends of the electrode, the two grooves are located at opposite corners of the electrode.

8. The integrated cover plate structure according to claim 4, characterized in that, When the tray is placed horizontally, the opening of the groove faces upward, and the upper surface of the electrode sheet inside the groove is lower than the upper surface of the baffle.

9. The integrated cover plate structure according to claim 4, characterized in that, The tray has multiple grooves and multiple baffles, with the grooves and baffles spaced apart, and the baffles having elastic structures on both sides.

10. A battery pack comprising at least one battery cell, characterized in that, It also includes an integrated cover plate structure as described in any one of claims 1-9, wherein the electrode is connected to the terminal post of the battery cell.

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