Lower plastic cement of battery cover plate with novel structure

Abstract

The invention discloses a novel structure battery cover plate lower plastic which comprises a lower plastic body, a battery cover plate is arranged on the lower plastic body, and wiring poles are arranged at the two ends of the upper surface of the battery cover plate; the anti-explosion valve plate is arranged in the middle of the inner side of the battery cover plate; the pressure relief through hole is formed in the middle of the inner side of the lower plastic body, and a rib assembly easy to damage is fixed to the inner side wall of the pressure relief through hole; wherein the lower plastic body comprises a first rubber plate, a second rubber plate and a third rubber plate; through the arrangement of the first rubber plate, the second rubber plate, the third rubber plate and the elastic rubber body, the device is convenient to replace and maintain after a certain section is damaged through the split type design, the required length size can be adjusted according to the actual requirement, and through the arrangement of the first friction surface and the second friction surface, the device is convenient to replace and maintain through the design of different roughness. When airtightness detection is carried out on the neglected sealing ring, leakage can be carried out so as to reduce outflow of defective products of the neglected sealing ring.

Description

Technical Field

[0001] The present invention specifically relates to a new structure of plastic under a battery cover. Background Art

[0002] Lithium batteries are a type of battery that uses lithium metal or lithium alloy as positive and negative electrode materials and non-aqueous electrolyte solutions. Due to the very active chemical properties of lithium metal, the processing, storage, and use of lithium metal have very high environmental requirements. With the development of science and technology, lithium batteries have now become mainstream. The plastic plate under the lithium battery cover is usually a key component in the design of the battery module. It is mainly used to provide structural support, protect battery cells, isolate heat sources or current, and help improve the safety and durability of the battery. The plastic under the battery cover is generally made by injection molding.

[0003] The existing plastic under the battery cover is mostly an integrated structure, which is not convenient for segmented maintenance in the later stage. The size is not easy to adjust after the integrated injection molding. Due to thermal expansion and contraction or mold making factors, the dimensional accuracy of the lower plastic is poor, which affects the precise installation of the lower plastic and the battery cover. In addition, during the later airtightness test, due to the close fit between the terminal post and the lower plastic, if the sealing ring is forgotten to be installed on the terminal post, the airtightness test cannot detect it, resulting in the outflow of defective products with missing sealing rings and poor use effect. For this reason, we propose a new structure of the plastic under the battery cover. Summary of the invention

[0004] The purpose of the present invention is to provide a new structure of the lower plastic of the battery cover to solve the problem that the lower plastic proposed in the above background technology is an integrated structure, which is inconvenient to maintain or adjust the size in sections later, and the lower plastic is tightly matched with the terminal pole, which affects the detection of missing sealing rings.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: A new structure of plastic under the battery cover, comprising:

[0006] A lower plastic body, on which a battery cover is disposed, and on both ends of an upper surface of the battery cover are disposed wiring poles;

[0007] The explosion-proof valve plate is arranged in the middle of the inner side of the battery cover;

[0008] A pressure relief through hole is provided in the middle of the inner side of the lower plastic body, and a fragile rib assembly is fixed to the inner side wall of the pressure relief through hole;

[0009] The lower plastic body includes a first plastic plate, a second plastic plate and a third plastic plate, and the second plastic plate and the third plastic plate are detachably mounted on both ends of the first plastic plate to correspond to the terminal poles;

[0010] The elastic colloid is arranged between the first rubber plate and the second rubber plate to elastically adjust the position of the first rubber plate.

[0011] Preferably, a mounting hole matching with the terminal pole is formed at the inner end of the lower plastic body, and the inner side of the mounting hole includes a first friction surface and a second friction surface, and the first friction surface and the second friction surface are spaced apart along the circumference of the mounting hole.

[0012] Preferably, the first rubber plate has two ends protruding outward to form a connecting head, a sliding plate is fixed to the lower end of the side wall of the connecting head, a connecting groove matching the connecting head is opened on one end surface of the second rubber plate, and the inner wall of the connecting groove has a snap-fit ​​structure connected to the connecting head.

[0013] Preferably, the locking structure comprises an elastic locking strip and a locking groove, the elastic locking strip is fixed to the upper end of the inner wall of the connecting slide groove, and the upper end of the side wall of the connecting head has a locking groove matched with the elastic locking strip.

[0014] Preferably, the elastic clip strip is arc-shaped, and a plurality of the clip slots and the elastic clip strips are provided.

[0015] Preferably, the elastic colloid includes a rubber base plate, a first elastic block and a second elastic block. The rubber base plate is fixed to the inner side of the connecting slide groove, and the first elastic block and the second elastic block are respectively arranged at both ends of the upper surface of the rubber base plate. The first elastic block and the second elastic block are staggered to expand and contract the adjacent long sides of the first rubber plate and the second rubber plate.

[0016] Preferably, the second rubber plate and the third rubber plate are equal in shape and size, and a convex plate is fixed on the lower surface of the second rubber plate.

[0017] Preferably, the rib assembly includes connecting ribs, damage holes and pressure-bearing surfaces, the connecting ribs are fixed to the inner wall of the pressure relief through hole, the inner ends of the connecting ribs are penetrated by damage holes for tearing during pressure relief, and the lower surface of the connecting ribs has a pressure-bearing surface that is recessed inward to bear pressure.

[0018] Preferably, a liquid injection hole is provided on the inner side of the battery cover plate, and a communication hole is provided on the inner side of the lower plastic body corresponding to the liquid injection hole.

[0019] Preferably, a raised enclosure is provided on the upper surface of the battery cover, an upper plastic plate is provided on the inner side of the enclosure, and the upper plastic plate is in contact with the terminal pole.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) This patent provides a first rubber plate, a second rubber plate, a third rubber plate and an elastic colloid to avoid the lower plastic being an integrated structure, which results in the lower plastic being inconvenient to replace separately after a certain section is damaged, affecting the convenience of maintenance, and the length of the integrated lower plastic is inconvenient to adjust after injection molding, affecting installation. The device is designed in a split type, which is convenient for replacement and maintenance after a certain section is damaged, and the required length can be adjusted according to actual needs to improve the convenience of installation. Furthermore, after installation, the elastic force of the elastic colloid can be used to bring the connecting hole and the injection hole closer together, and the gap between the two can be sealed to ensure that no leakage occurs during the subsequent injection, thereby improving the safety of injection.

[0022] (2) By providing the first friction surface and the second friction surface, it is prevented that the missing sealing ring is difficult to be found during the later air tightness test after the terminal is assembled to the inner side of the mounting hole. The device is designed with different roughnesses. When the sealing ring is missing and the air tightness test is performed, leakage can be detected to reduce the outflow of defective products due to the missing sealing ring, thereby increasing the practicality of the device.

[0023] (3) By providing connecting ribs, broken holes and pressure-bearing surfaces, the connecting strips on the inner side of the pressure relief hole are prevented from breaking easily, which would block the gas and affect the flow of gas to the outside when the lithium battery shell needs to release pressure unexpectedly. The device can automatically break during pressure relief to reduce the obstruction to the gas, thereby improving the smoothness of pressure relief and increasing the use effect of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 It is a schematic diagram of the lower plastic structure of the present invention;

[0026] Figure 3 It is a schematic diagram of the structure of the rib assembly of the present invention;

[0027] Figure 4 It is a schematic diagram of the connection structure between the first rubber plate and the second rubber plate of the present invention;

[0028] Figure 5 It is a schematic diagram of the elastic colloid structure of the present invention;

[0029] Figure 6 It is a schematic diagram of the cross-sectional structure of the connecting rib of the present invention;

[0030] Figure 7 It is a schematic structural diagram of the first friction surface of the present invention;

[0031] Figure 8 This is a schematic diagram of the existing wiring pole and the lower plastic;

[0032] In the figure: 1. lower plastic body; 101. first rubber plate; 102. second rubber plate; 103. third rubber plate; 104. convex plate; 105. mounting hole; 106. elastic clip; 107. clip slot; 109. connector; 110. slide plate; 112. connecting slide slot; 2. battery cover; 3. terminal pole; 4. upper plastic plate; 5. explosion-proof valve plate; 6. injection hole; 7. rib assembly; 701. connecting rib; 702. damaged hole; 703. pressure-bearing surface; 8. elastic colloid; 801. rubber bottom plate; 802. first elastic block; 803. second elastic block; 901. first friction surface; 902. second friction surface; 12. connecting hole; 13. sealing ring; 14. contact area. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1-Figure 8 The present invention provides a technical solution: a new structure of plastic under the battery cover, including:

[0035] A lower plastic body 1, on which a battery cover plate 2 is arranged, and two ends of the upper surface of the battery cover plate 2 are provided with terminal poles 3;

[0036] The explosion-proof valve plate 5 is arranged in the middle of the inner side of the battery cover plate 2;

[0037] The pressure relief hole is provided in the middle of the inner side of the lower plastic body 1, and a fragile rib assembly 7 is fixed to the inner wall of the pressure relief hole, so that when pressure relief is required, the rib assembly 7 can be broken and fractured to reduce the obstruction of the pressure relief gas and improve the smoothness of pressure relief;

[0038] The lower plastic body 1 includes a first plastic plate 101, a second plastic plate 102 and a third plastic plate 103. The second plastic plate 102 and the third plastic plate 103 are detachably mounted on both ends of the first plastic plate 101 to correspond to the terminal poles 3, so that the damaged section can be replaced and maintained later through the split lower plastic body 1, thereby reducing the inconvenience of overall replacement.

[0039] The elastic colloid 8 is arranged between the first rubber plate 101 and the second rubber plate 102 to elastically adjust the position of the first rubber plate 101, so as to facilitate the later adjustment of the length of the lower plastic body 1, so as to reduce the fixed length of the one-piece lower plastic during injection molding. After deformation caused by thermal expansion and contraction, it is not easy to connect and assemble the lower plastic with the battery cover 2. The device can adjust the length well, improve the convenience of later assembly, and can elastically support the first rubber plate 101 after installation, so that the connecting hole 12 on the first rubber plate 101 is close to the injection hole 6, reducing the gap between the two, so as to facilitate later injection.

[0040] Preferably, a mounting hole 105 matching with the terminal pole 3 is formed at the inner end of the lower plastic body 1, and the inner side of the mounting hole 105 includes a first friction surface 901 and a second friction surface 902, the first friction surface 901 and the second friction surface 902 are spaced apart from each other along the circumference of the mounting hole 105, and the first friction surface 901 and the second friction surface 902 have different roughnesses;

[0041] Existing Figure 8 As shown, the contact area 14 of the terminal post 3 and the lower plastic body 1 fits tightly, so that the entire cover plate has a "false seal". During the later airtightness test, if the sealing ring 13 is forgotten to be installed on the outer surface of the terminal post 3, the contact area 14 fits tightly, which will make it impossible to detect the missing sealing ring 13, resulting in the outflow of defective products.

[0042] The device uses different roughness to prevent the upper surface of the terminal pole 3 from being tightly fitted with the contact area 14 of the lower surface of the lower plastic body 1. If the sealing ring 13 is missing, the airtightness test in the subsequent process can detect it, thereby avoiding the outflow of defective products.

[0043] Preferably, both ends of the first rubber plate 101 protrude outward to form connecting heads 109, a slide plate 110 is fixed to the lower end of the side wall of the connecting head 109, and one end surface of the second rubber plate 102 is provided with a connecting groove 112 that cooperates with the connecting head 109, and the inner wall of the connecting groove 112 has a snap-fit ​​structure connected to the connecting head 109, so as to facilitate the rapid connection of the first rubber plate 101 and the second rubber plate 102.

[0044] Preferably, the snap-fit ​​structure includes an elastic snap strip 106 and a slot 107 , the elastic snap strip 106 is fixed to the upper end of the inner wall of the connecting slot 112 , and the upper end of the side wall of the connector 109 has a slot 107 that matches the elastic snap strip 106 , for easy quick snap-fit.

[0045] Preferably, the elastic clip 106 is arc-shaped, and a plurality of the clip slots 107 and the elastic clip 106 are provided, so as to facilitate the later adjustment of the gap between the first rubber plate 101 and the second rubber plate 102 , and further adjust the overall length of the lower plastic body 1 .

[0046] Preferably, the elastic colloid 8 includes a rubber bottom plate 801, a first elastic block 802 and a second elastic block 803. The rubber bottom plate 801 is fixed to the inner side of the connecting slide groove 112, so that the elastic force of the rubber bottom plate 801 can be used to support the first rubber plate 101 and the battery cover plate 2 to be close to each other, so as to reduce the gap between the connecting hole 12 and the injection hole 6, thereby preventing the injection liquid from flowing out from the larger gap during injection. The first elastic block 802 and the second elastic block 803 are respectively provided at both ends of the upper surface of the rubber bottom plate 801, so that the elastic stretching and shortening of the lower plastic body 1 can be adjusted. The first elastic block 802 and the second elastic block 803 are staggered to extend and retract the adjacent long sides of the first rubber plate 101 and the second rubber plate 102.

[0047] Preferably, the second rubber plate 102 and the third rubber plate 103 are equal in shape and size, and a convex plate 104 is fixed to the lower surface of the second rubber plate 102 .

[0048] Preferably, the rib assembly 7 includes a connecting rib 701, a damaged hole 702 and a pressure-bearing surface 703. The connecting rib 701 is fixed to the inner wall of the pressure relief through hole, so that the strength of the lower plastic body 1 can be improved by connecting the rib 701. The connecting rib 701 has a damaged hole 702 at both ends of the inner side for tearing during pressure relief. The lower surface of the connecting rib 701 has a pressure-bearing surface 703 that is recessed inward to bear pressure, so that it can be better broken and fractured by the impact of gas during pressure relief, thereby reducing the impact on the flow of the pressure relief gas during pressure relief.

[0049] Preferably, a liquid injection hole 6 is provided on the inner side of the battery cover plate 2 , and a connecting hole 12 is provided on the inner side of the lower plastic body 1 corresponding to the liquid injection hole 6 , so as to facilitate the subsequent injection of liquid into the battery housing.

[0050] Preferably, a raised enclosure is provided on the upper surface of the battery cover plate 2 , an upper plastic plate 4 is provided inside the enclosure plate, and the upper plastic plate 4 is in contact with the terminal pole 3 .

[0051] The working principle and use process of the present invention are as follows: when in use, the first rubber plate 101, the second rubber plate 102 and the third rubber plate 103 can be respectively injection molded to form, and then the elastic colloid 8 is placed on the inner side of the connecting slide groove 112, and the two are fixed by glue. The connector 109 at one end of the first rubber plate 101 is inserted into the inner side of the connecting slide groove 112. At this time, the elastic clip 106 and the clip groove 107 are engaged with each other to quickly complete the connection between the first rubber plate 101 and the second rubber plate 102. Similarly, the third rubber plate 103 can be connected to the first rubber plate 101 to form the lower plastic body 1. After a certain section of the lower plastic body 1 is damaged, it can be maintained separately at a later time. Furthermore, the thickness of the slide plate 110 is less than the thickness of the guide groove provided on the side wall of the connecting slide groove 112. The slide plate 110 can move up and down inside the guide groove. When the lower plastic body 1 is assembled to the lower surface of the battery cover 2, Through the elastic force of the first elastic block 802 and the second elastic block 803, the length of the lower plastic body 1 can be adjusted according to actual conditions, so as to reduce the poor installation effect caused by inaccurate size due to thermal expansion and contraction during injection molding. At the same time, the second rubber plate 102 and the third rubber plate 103 elastically support the first rubber plate 101 through the rubber bottom plate 801 to push the connecting hole 12 on the inner side of the first rubber plate 101 to be close to the corresponding injection hole 6, so as to avoid the lower plastic being an integrated type, resulting in the connecting hole 12 and the injection hole 6 being far away from each other, affecting the later injection effect. After being installed on the lithium battery shell in the later stage, when pressure relief occurs, the gas inside the lithium battery shell will impact the connecting rib 701, and the pressure-bearing surface 703 on the lower surface of the connecting rib 701 will be broken through the damaged hole 702 after being subjected to a large pressure, so as to facilitate the gas to quickly impact the explosion-proof valve plate 5 from the pressure relief through hole to relieve pressure to the outside.

[0052] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A new structure of plastic under the battery cover, characterized in that: include: A lower plastic body (1), wherein a battery cover plate (2) is arranged on the lower plastic body (1), and terminal poles (3) are arranged at both ends of the upper surface of the battery cover plate (2); An explosion-proof valve plate (5) is arranged in the middle of the inner side of the battery cover plate (2); A pressure relief through hole is provided in the middle of the inner side of the lower plastic body (1), and a fragile rib assembly (7) is fixed to the inner side wall of the pressure relief through hole; The lower plastic body (1) comprises a first plastic plate (101), a second plastic plate (102) and a third plastic plate (103); the second plastic plate (102) and the third plastic plate (103) are detachably mounted on two ends of the first plastic plate (101) to correspond to the terminal poles (3); The elastic colloid (8) is arranged between the first rubber plate (101) and the second rubber plate (102) to elastically adjust the position of the first rubber plate (101).

2. The new structure of the plastic under the battery cover according to claim 1 is characterized by: The inner end of the lower plastic body (1) is provided with a mounting hole (105) matched with the terminal pole (3), and the inner side of the mounting hole (105) includes a first friction surface (901) and a second friction surface (902), and the first friction surface (901) and the second friction surface (902) are spaced apart along the circumference of the mounting hole (105).

3. The new structure of the battery cover lower plastic according to claim 1 is characterized by: The first rubber plate (101) has two ends protruding outward to form a connecting head (109), a sliding plate (110) is fixed to the lower end of the side wall of the connecting head (109), and one end surface of the second rubber plate (102) is provided with a connecting groove (112) matching with the connecting head (109), and the inner wall of the connecting groove (112) has a snap-fit ​​structure connected to the connecting head (109).

4. The new structure of the plastic under the battery cover according to claim 3 is characterized by: The snap-fit ​​structure comprises an elastic snap strip (106) and a snap slot (107); the elastic snap strip (106) is fixed to the upper end of the inner wall of the connecting slide slot (112); and the upper end of the side wall of the connecting head (109) has a snap slot (107) matched with the elastic snap strip (106).

5. The new structure of the plastic under the battery cover according to claim 4 is characterized by: The elastic clip strip (106) is arc-shaped, and a plurality of the clip slots (107) and the elastic clip strip (106) are provided.

6. The new structure of the plastic under the battery cover according to claim 2 is characterized by: The elastic colloid (8) comprises a rubber base plate (801), a first elastic block (802) and a second elastic block (803); the rubber base plate (801) is fixed to the inner side of the connecting slide groove (112); and the first elastic block (802) and the second elastic block (803) are respectively arranged at two ends of the upper surface of the rubber base plate (801); the first elastic block (802) and the second elastic block (803) are staggered to extend and retract the adjacent long sides of the first rubber plate (101) and the second rubber plate (102).

7. The new structure of the battery cover lower plastic according to claim 2 is characterized by: The second rubber plate (102) and the third rubber plate (103) are equal in shape and size, and a convex plate (104) is fixed on the lower surface of the second rubber plate (102).

8. The new structure of the battery cover lower plastic according to claim 1 is characterized by: The rib assembly (7) comprises a connecting rib (701), a damaged hole (702) and a pressure-bearing surface (703); the connecting rib (701) is fixed to the inner wall of the pressure relief through hole; the inner ends of the connecting rib (701) are provided with damaged holes (702) for tearing during pressure relief; and the lower surface of the connecting rib (701) has a pressure-bearing surface (703) that is recessed inwards to bear pressure.

9. The new structure of the battery cover lower plastic according to claim 1 is characterized by: The battery cover plate (2) is provided with a liquid injection hole (6) on the inner side, and the lower plastic body (1) is provided with a communication hole (12) on the inner side corresponding to the liquid injection hole (6).

10. The new structure of the battery cover lower plastic according to claim 1 is characterized by: The upper surface of the battery cover (2) is provided with a raised enclosure, the inner side of the enclosure is provided with an upper plastic plate (4), and the upper plastic plate (4) is in contact with the terminal pole (3).

Images