Lower plastic plate assembly, cover plate assembly and battery cell

Abstract

The utility model provides a lower plastic plate component, a cover plate assembly and a battery cell, the lower plastic plate component comprises a lower plastic plate and a partition plate arranged on one side of the lower plastic plate facing a pole group; and the partition plate is made of an insulating material and is used for separating the main body of the pole group from the lower plastic plate, and the partition plate is provided with a via hole through which a pole lug of the pole group passes. According to the lower plastic plate assembly disclosed by the utility model, the partition plate for separating the main body of the pole group from the lower plastic plate is arranged on one side, facing the pole group, of the lower plastic plate, and the partition plate is provided with the through hole for the pole lug to pass through, so that the lower plastic plate can be prevented from being directly contacted with the diaphragm on the main body of the pole group, and the stress of the main body of the pole group can be more uniform; meanwhile, the shifting space of the pole group is reduced, and the lower plastic plate can be prevented from damaging the main body and the tab of the pole group, so that the safety of the battery cell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a lower plastic plate assembly; at the same time, the utility model also relates to a cover plate assembly provided with the lower plastic plate assembly, and a battery core provided with the cover plate assembly. Background Art

[0002] As lithium-ion battery technology matures, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the performance and safety of lithium-ion batteries are increasing. Lithium cells are the core components of battery pack safety and assembly, and their structural design is crucial to cell safety.

[0003] In the prior art, the lower plastic plate is located on the inner side of the cover plate, and the pole lug on the pole group is folded and connected to the bottom plate of the pole column located on the inner side of the lower plastic plate. However, this traditional connection method results in poor fixing effect of the pole group, and the pole group is easy to move. The actual force generated by the pole group and the lower plastic plate is the diaphragm. However, the diaphragm is very thin and has low strength, so it is easy to be damaged. In addition, the lower plastic plate is in direct contact with the pole lug diaphragm, which poses a risk of damaging the pole lug, which is not conducive to the safety of the battery cell. Utility Model Content

[0004] In view of this, the utility model aims to provide a lower plastic plate assembly to prevent the lower plastic plate from damaging the pole group.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] A lower plastic plate assembly comprises a lower plastic plate and a separator arranged on a side of the lower plastic plate facing the electrode group;

[0007] The partition is made of insulating material and is used to separate the main body of the electrode group from the lower plastic plate. The partition is provided with a through hole for the electrode ear of the electrode group to pass through.

[0008] Furthermore, the lower plastic plate is connected to the partition plate by snap-fitting.

[0009] Furthermore, one of the lower plastic plate and the partition is provided with a buckle, and the other is provided with a clamping hole, and the lower plastic plate and the partition are connected together by clamping the buckle with the clamping hole.

[0010] Furthermore, a notch is provided on the buckle, so as to separate the buckle into a plurality of clamping parts arranged at intervals, and the plurality of clamping parts can be moved closer to or away from each other.

[0011] Furthermore, the width D of the free end of the buckle satisfies: 2mm≤D≤6mm, the height H of the buckle satisfies: H≥0.6mm; and / or the thickness W of the partition satisfies: 0.3mm≤W≤2mm.

[0012] Furthermore, the partition is provided with the buckles at both ends facing the lower plastic plate, and the buckles are arranged at the two ends of the lower plastic plate in a one-to-one correspondence with the buckles.

[0013] Furthermore, both ends of the lower plastic plate are respectively provided with protruding parts protruding toward the partition, and the clamping holes are respectively provided on each of the protruding parts.

[0014] Furthermore, the via hole is arranged on one side of the partition and extends along the length direction of the partition.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] The lower plastic plate assembly described in the utility model can avoid direct contact between the lower plastic plate and the diaphragm on the main body of the electrode group by arranging a partition separating the main body of the electrode group and the lower plastic plate on the side of the lower plastic plate facing the electrode group, and arranging through holes on the partition for the electrode ears to pass through, so as to make the force on the main body of the electrode group more uniform, and at the same time help to reduce the movement space of the electrode group, and can prevent the lower plastic plate from damaging the main body and the electrode ear of the electrode group, thereby helping to improve the safety of the battery cell.

[0017] In addition, the lower plastic plate is connected to the partition by snapping, which is conducive to improving assembly efficiency. The structure of the buckle and the snap hole is simple, and the snapping effect of the two is good. The setting of the notch on the buckle forms a plurality of snap-fitting parts, and the snap-fitting parts can be close to or away from each other, which is conducive to the buckle being installed into the snap hole and snap-fitted with the snap hole. The setting of the width and height range of the free end of the buckle is conducive to ensuring the snap-fitting strength; the setting of the thickness range of the partition is conducive to meeting the use requirements of the partition. Setting the buckle on the partition and the snap hole on the lower plastic plate has the advantage of easy layout and implementation.

[0018] In addition, by setting the clamping hole on the protruding part of the lower plastic plate, it is beneficial to improve the clamping effect between the lower plastic plate and the partition, and the supporting effect of the partition on the electrode group body. The through hole is set on one side of the partition, which is beneficial for the pole ear to pass through and flip over to connect with the bottom plate of the pole.

[0019] In addition, another object of the present invention is to provide a cover plate assembly, including a cover plate, and the above-mentioned lower plastic plate component arranged on one side of the cover plate.

[0020] The cover plate assembly of the utility model is beneficial to improving the safety of the battery cell by arranging the lower plastic plate component as above.

[0021] Furthermore, the utility model also provides a battery cell, comprising the cover plate assembly as described above.

[0022] The battery cell described in the present invention has the same beneficial effects as the above-mentioned cover plate assembly, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0024] Figure 1 This is a structural schematic diagram of the lower plastic plate assembly described in an embodiment of the utility model in a use state;

[0025] Figure 2 This is a schematic structural diagram of the lower plastic plate assembly and the cover plate in an assembled state according to an embodiment of the utility model;

[0026] Figure 3 for Figure 2 AA direction section view;

[0027] Figure 4 This is a schematic diagram of the structure of the separator and the electrode group in the assembled state according to the embodiment of the utility model;

[0028] Figure 5 This is a schematic diagram of the structure of the partition described in the embodiment of the utility model;

[0029] Figure 6 This is a schematic structural diagram of the lower plastic plate described in an embodiment of the utility model.

[0030] Description of reference numerals:

[0031] 1. Shell; 2. Electrode group; 3. Partition plate; 4. Lower plastic plate; 5. Cover plate;

[0032] 201, main body; 202, ear;

[0033] 301, through hole; 302, buckle; 3021, snap-fit ​​split; 3022, notch;

[0034] 401, protruding portion; 402, clamping hole; 403, leakage hole;

[0035] 501. Pole. DETAILED DESCRIPTION

[0036] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0037] In the description of the present invention, it should be noted that if there are terms indicating orientation or positional relationship such as "upper", "lower", "inner", "back", etc., they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first", "second", etc., they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0038] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0039] This embodiment relates to a lower plastic plate assembly, which comprises a lower plastic plate 4 and a partition 3 arranged on the side of the lower plastic plate 4 facing the electrode group 2. The partition 3 is made of insulating material and is used to separate the main body 201 of the electrode group 2 and the lower plastic plate 4, and the partition 3 is provided with a through hole 301 for the electrode ear 202 of the electrode group 2 to pass through.

[0040] The lower plastic plate assembly described in this embodiment can avoid direct contact between the lower plastic plate 4 and the diaphragm on the main body 201 of the electrode group 2, and can make the force on the main body 201 of the electrode group 2 more uniform, and at the same time help to reduce the movement space of the electrode group 2, and can prevent the lower plastic plate 4 from damaging the main body 201 and the electrode ear 202 of the electrode group 2, thereby helping to improve the safety of the battery cell.

[0041] Based on the above overall introduction, an exemplary structure of the lower plastic plate assembly described in this embodiment is as follows: Figures 1 to 3 As shown in . The structure of the lower plastic plate 4 is basically the same as that of the lower plastic plate 4 in the prior art. It is arranged on the side of the cover plate 5 facing the pole group 2 and is installed on the housing 1 with the cover plate 5. The partition 3 is rectangular and matches the shape of the lower plastic plate 4. The through hole 301 is arranged on one side of the partition 3 and extends along the length direction of the partition 3. The pole ear 202 is folded after passing through the through hole 301, and is connected to the bottom plate of the pole 501 through the folded part, which is conducive to ensuring the folding effect of the pole ear 202, and further conducive to improving the connection effect between the pole 501 and the pole ear 202.

[0042] In the assembled state, Figure 3 and Figure 4As shown in the figure, the pole ear 202 passes through the partition 3 and is folded and connected to the bottom plate of the pole column 501. The partition 3 is sandwiched between the end of the pole group 2 and the lower plastic plate 4, which can not only separate the main body 201 of the entire pole group 2 from the lower plastic plate 4, but also apply a uniform force to the end of the main body 201 of the pole group 2, thereby improving the force uniformity of the pole group 2.

[0043] As a preferred connection method, the lower plastic plate 4 is connected to the partition 3 by snapping. The snap connection method has the advantage of being easy to install, thereby improving the assembly efficiency between the lower plastic plate 4 and the partition 3. In terms of specific structure, one of the lower plastic plate 4 and the partition 3 is provided with a snap 302, and the other is provided with a snap hole 402. The lower plastic plate 4 and the partition 3 are connected together by snapping the snap 302 and the snap hole 402. Here, the structure of the snap 302 and the snap hole 402 is simple, and the snap connection effect of the two is good.

[0044] like Figures 4 to 6 As shown in the figure, buckles 302 are respectively provided at both ends of the partition 3 facing the lower plastic plate 4, and the buckle holes 402 are arranged at both ends of the lower plastic plate 4 in a one-to-one correspondence with the buckles 302. Here, the buckles 302 are arranged on the partition 3, and the buckle holes 402 are arranged on the lower plastic plate 4, which has the advantage of easy arrangement and implementation. Of course, the positions of the buckles 302 and the buckle holes 402 can also be swapped, that is, the buckles 302 are arranged at both ends of the lower plastic plate 4, and the buckle holes 402 are arranged at both ends of the partition 3.

[0045] In order to further improve the snap-fitting effect between the buckle 302 and the snap-fitting hole 402, in this embodiment, a notch 3022 is provided on the buckle 302, and the buckle 302 is divided into a plurality of snap-fitting sub-bodies 3021 arranged at intervals, and the plurality of snap-fitting sub-bodies 3021 can be brought closer to or away from each other. The notch 3022 on the buckle 302 forms a plurality of snap-fitting sub-bodies 3021, and the snap-fitting sub-bodies 3021 can be brought closer to or away from each other, which is conducive to the buckle 302 being installed into the snap-fitting hole 402 and snap-fitting and connected with the snap-fitting hole 402.

[0046] In terms of specific structure, Figure 5 As shown in the figure, a notch 3022 is provided on the buckle 302, and two clamping parts 3021 are arranged opposite to each other and spaced apart. When the buckle 302 is inserted into the clamping hole 402, the two clamping parts 3021 can approach each other until the free end of the buckle 302 passes through the clamping hole 402, and then each clamping part 3021 returns to its original position, and the clamping head of the free end of each clamping part 302 is clamped on the other side of the partition 3. Of course, the number of the clamping parts 3021 can be adaptively increased or decreased according to the use requirements.

[0047] In addition, a guide surface is provided at the free end of each clamping body 3021, and the clamping body 3021 abuts against the clamping hole 402 through the guide surface so as to be close to each other. Therefore, the provision of the guide surface is conducive to improving the convenience of the clamping body 3021 being clamped into the clamping hole 402. Here, the structure of the guide surface is simple, easy to arrange and implement, and has a good guiding effect.

[0048] In specific implementation, as a feasible implementation method, Figure 3 As shown in , the width D of the free end of the buckle 302 satisfies: 2mm≤D≤6mm, and the height H of the buckle 302 satisfies: H≥0.6mm. The setting of the two parameters in the buckle 302 is conducive to ensuring the structural strength of the buckle 302 and the clamping strength between the buckle 302 and the clamping hole 402. In addition, the thickness W of the partition 3 satisfies: 0.3mm≤W≤2mm, which is conducive to meeting the use requirements of the partition 3.

[0049] For example, the width D of the free end of the buckle 302 may be 2 mm, 3 mm, 4 mm, 5 mm or 6 mm, etc. The height H of the buckle 302 may be 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm or 0.8 mm, etc. The thickness W of the partition 3 may be 0.3 mm, 0.5 mm, 1.5 mm, 1.8 mm or 2 mm, etc.

[0050] As a preferred embodiment, Figure 3 and Figure 6 As shown in , both ends of the lower plastic plate 4 are provided with protruding portions 401 protruding toward the partition 3, and the clamping holes 402 are respectively provided on each protruding portion 401. By providing the clamping holes 402 on the protruding portions 401 of the lower plastic plate 4, the distance between the clamping holes 402 and the buckles 302 can be reduced, which is conducive to improving the clamping effect between the lower plastic plate 4 and the partition 3. The lower plastic plate 4 applies force to the partition 3 through the two protruding portions 401, and acts on the end surface of the main body 201 of the electrode group 2 through the partition 3, so as to improve the supporting effect of the partition 3 on the main body 201 of the electrode group 2, and further help prevent damage to the electrode group 2.

[0051] In addition, the specifications of the two protruding parts 401 can be determined according to the use requirements. In order to facilitate the electrolyte flowing into the cover plate 5 and the lower plastic plate 4 to flow back to the inner side of the lower plastic plate 4, a leakage hole 403 can be set on at least one of the protruding parts 401. For example, the leakage holes 403 are relatively set on two opposite sides of the clamping hole 402, and the position and number of the leakage holes 403 can also be adjusted according to the needs during the specific implementation.

[0052] It should be noted that the position, quantity and structure of the buckle 302 and the hole 402 can be adaptively adjusted. In addition, in addition to the snap connection, the partition 3 and the lower plastic plate 4 in this embodiment can also adopt other connection structures that meet the connection requirements.

[0053] The partition 3 in this embodiment is preferably made by injection molding, which is conducive to ensuring the structural strength of the partition 3, and the processing technology is simple and low-cost. In specific implementation, the insulating material used to prepare the partition 3 has a wide range of choices and is not limited to plastic materials.

[0054] The lower plastic plate assembly described in this embodiment is provided with a partition 3. When the pole group 2 is pushed into the housing 1, the force can be directly applied to the partition 3, so that the force on the pole group 2 is more uniform, and the possibility of damage to the pole piece is reduced. At the same time, the pole group 2 can be better fixed and the movement space of the pole group 2 can be reduced. In addition, the partition 3 can also more comprehensively protect the pole ear 202, reduce the risk of damage and tearing of the pole ear 202, and further improve the safety of the battery cell.

[0055] In addition, the present embodiment also relates to a cover plate 5 assembly, including a cover plate 5 and the above-mentioned lower plastic plate component arranged on one side of the cover plate 5 .

[0056] The cover plate 5 assembly described in this embodiment is beneficial to improving the safety of the battery cell by providing the above lower plastic plate component.

[0057] In addition, this embodiment also relates to a battery cell, including the cover plate 5 assembly as described above.

[0058] The battery cell described in this embodiment has the same beneficial effects as the above-mentioned cover plate 5 assembly, which will not be described in detail here.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A lower plastic plate assembly, characterized in that: It includes a lower plastic plate and a separator arranged on the side of the lower plastic plate facing the electrode group; The partition is made of insulating material and is used to separate the main body of the electrode group from the lower plastic plate. The partition is provided with a through hole for the electrode ear of the electrode group to pass through.

2. The lower plastic plate assembly according to claim 1, characterized in that: The lower plastic plate is connected with the partition plate by clamping.

3. The lower plastic plate assembly according to claim 2, characterized in that: One of the lower plastic plate and the partition is provided with a buckle, and the other is provided with a clamping hole. The lower plastic plate and the partition are connected together by clamping the buckle with the clamping hole.

4. The lower plastic plate assembly according to claim 3, characterized in that: The buckle is provided with a notch to separate the buckle into a plurality of clamping parts arranged at intervals, and the plurality of clamping parts can be moved closer to or away from each other.

5. The lower plastic plate assembly according to claim 3, characterized in that: The width D of the free end of the buckle satisfies: 2mm≤D≤6mm, and the height H of the buckle satisfies: H≥0.6mm; and / or, The thickness W of the partition satisfies: 0.3mm≤W≤2mm.

6. The lower plastic plate assembly according to claim 3, characterized in that: The partition is provided with the buckles at both ends facing the lower plastic plate, and the buckles are arranged at the two ends of the lower plastic plate in a one-to-one correspondence with the buckles.

7. The lower plastic plate assembly according to claim 6, characterized in that: Both ends of the lower plastic plate are respectively provided with protruding parts protruding toward the partition plate, and the clamping holes are respectively provided on each of the protruding parts.

8. The lower plastic plate assembly according to any one of claims 1 to 7, characterized in that: The through hole is arranged on one side of the partition and extends along the length direction of the partition.

9. A cover plate assembly, characterized in that: It comprises a cover plate, and a lower plastic plate assembly according to any one of claims 1 to 8 arranged on one side of the cover plate.

10. A battery cell, characterized in that: Including the cover plate assembly as described in claim 9.

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