Cover plate assembly and battery cell

Abstract

The utility model provides a cover plate assembly and a battery cell, the cover plate assembly comprises: a cover plate body, lower plastic located at one side of the cover plate, and a pole, the pole comprises a cylindrical body penetrating through the lower plastic and the cover plate body, and a pole bottom plate located at one side of the lower plastic far away from the cover plate body; the first sealing ring is positioned between the lower plastic and the cover plate body; the second sealing ring is positioned between the lower plastic and the pole base of the pole; and the first sealing ring and the second sealing ring are arranged around the cylindrical body. According to the utility model, at least one sealing ring is respectively arranged between the lower plastic and the cover plate body as well as between the lower plastic and the pole base, so that external electrolyte is prevented from entering the cavity, and the safety of the battery cell is ensured; meanwhile, the newly added sealing ring can be used as a backup sealing ring under the condition that the L-shaped sealing ring fails, so that the sealing performance of the battery cell is ensured, and the safety of the battery cell is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to battery technical field, concretely relates to a cover plate subassembly and electric core. BACKGROUND

[0002] At present, the plastic on the negative electrode top cover of the electric core usually uses insulating material, and the resistance is usually above 500MΩ, so as to ensure the good insulation between the electric core shell and the negative electrode riveting block and prevent the aluminum shell from being corroded. In order to meet the sealing requirement of the riveting top cover, an L-shaped annular sealing ring is usually arranged around the pole, and the compression part of the L-shaped sealing ring is compressed into the cavity area formed by the cover plate body, the pole top plate and the lower plastic, so as to realize sealing. However, there is a problem that the electrolyte enters the cavity part. SUMMARY

[0003] The electrolyte flowing into the cavity part will connect the cover plate body and the pole base, short-circuit the negative electrode upper plastic insulation resistance, reduce the resistance between the negative electrode riveting block and the cover plate body, easily cause the voltage abnormality of the positive electrode side edge of the whole electric core, and the aluminum shell also has a certain corrosion risk, which affects the safety of the whole electric core. In view of the above shortcomings of the prior art, the purpose of the utility model is to provide a cover plate subassembly and electric core, so as to improve the problem that the electrolyte may flow into the remaining cavity part.

[0004] To achieve the above object and other related objects, the utility model provides a cover plate subassembly, which comprises:

[0005] A cover plate body, a lower plastic located on one side of the cover plate, and

[0006] A pole, the pole comprising a columnar body penetrating through the lower plastic and the cover plate body, and a pole base located on the side of the lower plastic away from the cover plate body;

[0007] A first sealing ring located between the lower plastic and the cover plate body;

[0008] A second sealing ring located between the lower plastic and the pole base of the pole;

[0009] The first sealing ring and the second sealing ring are arranged around the columnar body.

[0010] In one preferred embodiment of the utility model, the bottom surface of the cover plate body and the top surface of the lower plastic are correspondingly provided with first grooves, one side of the pole base facing the cover plate body and the bottom surface of the lower plastic are correspondingly provided with second grooves, the first sealing ring is installed in the first groove, and the second sealing ring is installed in the second groove.

[0011] In an optimal embodiment of the utility model, the bottom surface of the cover plate body and / or the top surface of the lower plastic is further provided with a third groove, the third groove is located on one side of the first groove and forms a stepped groove with the first groove; one side of the pole post base facing the cover plate body and / or the bottom surface of the lower plastic is further provided with a fourth groove, the fourth groove is located on one side of the second groove and forms a stepped groove with the second groove.

[0012] In an optimal embodiment of the utility model, the total height of the first groove is less than the height of the first sealing ring before compression, the total height of the second groove is less than the height of the second sealing ring before compression, part of the first sealing ring is located in the third groove after compression, and part of the second sealing ring is located in the fourth groove after compression.

[0013] In an optimal embodiment of the utility model, the compression amount of the first sealing ring and the second sealing ring is set between 15% and 45%.

[0014] In an optimal embodiment of the utility model, the depth of the third groove is less than the depth of the first groove, and the depth of the fourth groove is less than the depth of the second groove.

[0015] In an optimal embodiment of the utility model, the width of the third groove and the fourth groove is at least 0.2mm larger than the outer diameter of the corresponding sealing ring.

[0016] In an optimal embodiment of the utility model, the first groove and the third groove on the bottom surface of the cover plate body and the first groove and the third groove on the top surface of the lower plastic are symmetrically arranged about the contact surface between the cover plate body and the lower plastic; the second groove and the fourth groove on the pole post base and the second groove and the fourth groove on the bottom surface of the lower plastic are symmetrically arranged about the contact surface between the lower plastic and the pole post base.

[0017] In an optimal embodiment of the utility model, the outer diameter of the first sealing ring and the second sealing ring is less than the width of the lower plastic, and the inner diameter of the first sealing ring and the second sealing ring is greater than the diameter of the pole post through hole on the lower plastic.

[0018] The utility model also provides a kind of electric core, it is characterized in that, including:

[0019] Shell, electrode assembly mounted in the shell;

[0020] The cover plate assembly as described in any one of the above embodiments is sealingly and fixedly connected with the shell, and the pole post of the cover plate assembly is electrically connected with the electrode assembly.

[0021] The utility model provides a cover plate subassembly and electric core, its through between lower plastic and cover plate body and between lower plastic and pole post base respectively installs at least one sealing ring, prevents external electrolyte from entering cavity to ensure the safety of electric core, simultaneously, the newly added sealing ring can be backup sealing ring under the condition of L type sealing ring failure, and then guarantee the sealing property of electric core, improve the safety of electric core. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will be needed to use the drawing of the embodiment briefly introduced, obviously, the drawing in the following description only some embodiments of the utility model, for ordinary skilled person in the art, under the premise of not paying creative labor, still can obtain other drawings according to these drawings.

[0023] Figure 1 It is the cross section schematic view of cover plate subassembly in an embodiment of the utility model.

[0024] Figure 2 It is the schematic diagram of stepped groove of cover plate subassembly in an embodiment of the utility model.

[0025] Figure 3 It is the top surface schematic view of lower plastic of cover plate subassembly in an embodiment of the utility model.

[0026] Figure 4 It is the bottom surface schematic view of lower plastic of cover plate subassembly in an embodiment of the utility model.

[0027] Figure 5 It is the schematic diagram of sealing ring of cover plate subassembly in an embodiment of the utility model.

[0028] Figure 6 It is Figure 1 The enlarged schematic view of A in the middle.

[0029] Label explanation:

[0030] 10, cover plate subassembly, 11, cover plate body, 12, pole post, 13, lower plastic, 14, upper plastic, 15, L-shaped annular sealing ring, 121, pole post base, 122, columnar body, 16, sealing ring, 161, first sealing ring, 162, second sealing ring, 101, first recess, 102, second recess, 103, third recess, 104, fourth recess. DETAILED DESCRIPTION

[0031] The following specific examples illustrate the embodiments of the present application, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosure of the present application. The present application can also be implemented or applied in other different specific embodiments, and each detail in the present application can be modified or changed based on different viewpoints and applications without departing from the spirit of the present application.

[0032] It should be noted that the diagrams provided in the present embodiment only illustrate the basic concept of the present application in a schematic manner, and only show the components related to the present application in the diagrams, not the number, shape and size of the components when actually implemented. The shape, number and ratio of each component when actually implemented can be changed arbitrarily, and the component layout pattern can also be more complex.

[0033] In view of the defects of the prior art, it is noted that the battery cell is in an upright state during the liquid injection and formation stages. In particular, for the battery cell with a double-pass structure, the positive electrode top cover is at the upper part and the negative electrode top cover is at the lower part during the formation stage, and the inner side of the negative electrode top cover is completely in a state of being soaked in electrolyte. When the inner side of the negative electrode top cover is in the state of being soaked in electrolyte, since the cavity is not necessarily filled with the L-shaped annular sealing ring as described above, the electrolyte can flow into the remaining cavity part, which can connect the cover body and the pole post base, short-circuit the negative electrode upper plastic insulation resistor, and reduce the resistance between the negative electrode riveting block and the cover body, which can easily cause the voltage on the positive electrode side of the entire battery cell to be abnormal, and the aluminum shell can also be corroded to a certain extent, affecting the overall safety of the battery cell.

[0034] Please refer to Figures 1 to 6As shown, the utility model provides a kind of cover plate assembly and electric core to improve that electrolyte possibly flows into remaining cavity portion, communication cover plate body and pole post base, make the resistance between negative pole riveting block and cover plate body drop, easily cause the voltage anomaly of whole electric core positive side, aluminum shell also can exist certain corrosion risk, affect the security of electric core as a whole, remaining cavity portion refers to the area that is not filled in the cavity area formed by cover plate body, pole post base and lower plastic three by L-shaped sealing ring compression site around pole post.The specific, cover plate assembly 10 includes cover plate body 11, pole post 12, lower plastic 13, upper plastic 14 and L-shaped ring seal 15, pole post through hole is provided on cover plate body 11, pole post 12 is installed on cover plate body 11 by passing through pole post through hole, lower plastic 13 is located at one side of cover plate body 11, this pole post 12 includes the columnar body 122 passing through lower plastic 13 and cover plate body 11, and the pole post bottom plate 121 located at the side of lower plastic 13 away from cover plate body 11, upper plastic 14 is set on columnar body 122, and is located at the side of cover plate body 11 away from lower plastic 13, L-shaped ring seal 15 is set on columnar body 122, and is located between pole post through hole and columnar body 122, cover plate body 11, pole post 12's pole post base 121 and lower plastic 13 three form cavity area, and L-shaped ring seal 15 is partially compressed and filled to the cavity area.

[0035] Please refer to Figure 1 And Figure 2 As shown, in the embodiment, it also includes sealing ring 16, the sealing ring 16 includes first sealing ring 161 and second sealing ring 162, at least one first sealing ring 161 is provided between lower plastic 13 and cover plate body 11, and at least one second sealing ring 162 is provided between lower plastic 13 and the pole post base 121 of pole post 12, the first sealing ring 161 and second sealing ring 162 are all arranged around columnar body 122, first sealing ring 161 is compressed under the extrusion of lower plastic 13 and cover plate body 11 and second sealing ring 162 is compressed under the extrusion of lower plastic 13 and pole post base 121, to realize fixed and sealed, in turn prevent external electrolyte from entering cavity, to ensure the security of electric core;Meanwhile, the first sealing ring 161 and second sealing ring 162 newly added can also be backup sealing ring in the case where L-type ring seal 15 fails, in turn guarantee the sealing property of electric core, improve the security of electric core.

[0036] Please refer to Figures 1 to 4As shown, in this embodiment, the bottom surface of the cover plate body 11 and the top surface of the lower plastic 13 are provided with a first groove 101 corresponding thereto, the bottom surface of the lower plastic 13 and the side of the pole base 121 facing the cover plate body 11 are provided with a second groove 102 corresponding thereto, the first groove 101 is provided with a first sealing ring 161, and the second groove 102 is provided with a second sealing ring 162. Specifically, when the cover plate body 11, the pole 12 and the lower plastic 13 are installed, the bottom surface of the cover plate body 11 and the top surface of the lower plastic 13 form a receiving space at the first groove 101, and the bottom surface of the lower plastic 13 and the side of the pole base 121 facing the cover plate body 11 form a receiving space at the second groove 102, and the first sealing ring 161 and the second sealing ring 162 are respectively installed in the corresponding receiving space. It can be understood that the outer diameter of the first sealing ring 161 and the second sealing ring 162 is smaller than the width of the lower plastic 13, and the inner diameter of the first sealing ring 161 and the second sealing ring 162 is greater than the diameter of the pole through hole 131 on the lower plastic 13, so as to ensure that the first sealing ring 161 and the second sealing ring 162 can be reliably installed, and at the same time surround the remaining cavity part described in the above embodiment, so as to prevent the external electrolyte from entering the cavity, thereby ensuring the safety of the battery cell.

[0037] As shown in the above embodiment, the bottom surface of the cover plate body 11 and the top surface of the lower plastic 13 are provided with a first groove 101 corresponding thereto, the bottom surface of the lower plastic 13 and the side of the pole base 121 facing the cover plate body 11 are provided with a second groove 102 corresponding thereto, the first groove 101 is provided with a first sealing ring 161, and the second groove 102 is provided with a second sealing ring 162. Figures 1 to 4 As shown, in this embodiment, the top surface of the lower plastic 13 can also be provided with a third groove 103, and the bottom surface of the lower plastic 13 can be provided with a fourth groove 104, the third groove 103 is located on one side of the first groove 101 to form a stepped groove with the first groove 101, and the fourth groove 104 is located on one side of the second groove 102 to form a stepped groove with the second groove 102. Specifically, the depth of the third groove 103 is smaller than the depth of the first groove 101, and the depth of the fourth groove 104 is smaller than the depth of the second groove 102, so as to form a stepped groove.

[0038] Of course, in some other embodiments, the bottom surface of the cover plate body 11 can also be provided with a third groove 103, and the side of the pole base 121 facing the cover plate body 11 can be provided with a fourth groove 104, the third groove 103 and the first groove 101 on the cover plate body 11 form a stepped groove, and the fourth groove 104 and the second groove 102 on the pole base 12 form a stepped groove. Of course, the third groove 103 can also be provided on the bottom surface of the cover plate body 11 and the top surface of the lower plastic 13 to form a stepped groove on the bottom surface of the cover plate body 11 and the top surface of the lower plastic 13 respectively, and the fourth groove 104 can be provided on the side of the pole base 121 facing the cover plate body 11 and the bottom surface of the lower plastic 13 to form a stepped groove on the side of the pole base 121 facing the cover plate body 11 and the bottom surface of the lower plastic 13 respectively.

[0039] As shown in the above embodiment, the bottom surface of the cover plate body 11 and the top surface of the lower plastic 13 are provided with a first groove 101 corresponding thereto, the bottom surface of the lower plastic 13 and the side of the pole base 121 facing the cover plate body 11 are provided with a second groove 102 corresponding thereto, the first groove 101 is provided with a first sealing ring 161, and the second groove 102 is provided with a second sealing ring 162. Figures 1 to 6As shown, in the embodiment, the third groove 103 and the fourth groove 104 provide compression space for the compression of the first seal ring 161 and the second seal ring 162 respectively. Specifically, the total height of the first groove 101 is less than the height of the first seal ring 161 before compression, and the total height of the second groove 102 is less than the height of the second seal ring 162 before compression. When installed, the first seal ring 161 is compressed under the extrusion of the lower plastic 13 and the cover plate body 11, and the second seal ring 162 is compressed under the extrusion of the lower plastic 13 and the pole post base 121. The compressed first seal ring 161 is partially located in the third groove 103, and the compressed second seal ring 162 is partially located in the fourth groove 104. In the embodiment, the first groove 101, the second groove 102, the third groove 103 and the fourth groove 104 are arranged around the pole post through hole, and the third groove 103 is at least 0.2mm larger than the outer diameter of the corresponding first seal ring 161, and the fourth groove 104 is at least 0.2mm larger than the outer diameter of the corresponding second seal ring 162, so as to leave sufficient compression space for the first seal ring 161 and the second seal ring 162. It can be understood that the total height of the first groove 101 and the total height of the second groove 102 refer to the sum of the depth of the first groove 101 on the bottom surface of the cover plate body 11 and the depth of the first groove 101 on the top surface of the lower plastic 13, and the sum of the depth of the second groove 102 on the bottom surface of the lower plastic 13 and the depth of the second groove 102 on the pole post base 121.

[0040] As shown in FIG. 1, the cover plate body 11 is provided with a first groove 101 and a second groove 102, and the lower plastic 13 is provided with a third groove 103 and a fourth groove 104. Figures 1 to 4 As shown, in the embodiment, when the third groove 103 is provided on the bottom surface of the cover plate body 11 and the top surface of the lower plastic 13, and the fourth groove 104 is provided on the side of the pole post base 121 facing the cover plate body 11 and the bottom surface of the lower plastic 13, the first groove 101 and the third groove 103 on the bottom surface of the cover plate body 11 and the first groove 101 and the third groove 103 on the top surface of the lower plastic 13 are symmetrically arranged about the contact surface between the cover plate body 11 and the lower plastic 13; the second groove 102 and the fourth groove 104 on the pole post base 121 and the second groove 102 and the fourth groove 104 on the bottom surface of the lower plastic 13 are symmetrically arranged about the contact surface between the lower plastic 13 and the pole post base 121, so as to facilitate processing.

[0041] As shown in FIG. 1, the cover plate body 11 is provided with a first groove 101 and a second groove 102, and the lower plastic 13 is provided with a third groove 103 and a fourth groove 104. Figures 1 to 6As shown, since the height of the first sealing ring 161 before compression is greater than the total height of the first groove 101, and the height of the compression ring of the second sealing ring 162 is greater than the total height of the second groove 102, after installation, the first sealing ring 161 and the second sealing ring 162 will be compressed, and in this embodiment, the compression amount of the first sealing ring 161 and the second sealing ring 162 is set to be between 15% and 45%. For example, for the first sealing ring 161 between the cover plate body 11 and the lower plastic 13, the height before compression is 0.3mm, the inner ring radius is 8mm, the outer ring radius is 8.2mm, the depth of the first groove 101 is 0.1mm, the depth of the third groove 103 is 0.05mm, the third groove 103 is located on the outside of the first groove 101, and the maximum diameter is 8.4mm, which provides sufficient compression space for the sealing ring, that is, the accommodation space height accommodating the first sealing ring 161 after compression is the total height of the first groove 101, that is, 0.2mm, and the compression rate of the first sealing ring 161 is (0.3-0.2) / 0.3=33.3%; for the second sealing ring 162 between the lower plastic 13 and the pole post base 121, the height before compression is 0.3mm, the inner ring radius is 7mm, the outer ring radius is 7.2mm, the depth of the second groove 102 is 0.1mm, the depth of the fourth groove 104 is 0.05mm, the fourth groove 104 is located on the outside of the second groove 102, and the maximum diameter is 8.4mm, which provides sufficient compression space for the second sealing ring 162, that is, the accommodation space height accommodating the second sealing ring 162 after compression is the total height of the second groove 102, that is, 0.2mm, and the compression rate of the sealing ring 16 is (0.3-0.2) / 0.3=33.3%.

[0042] Please refer to Figures 1 to 6 As shown, the utility model also proposes a kind of battery cell, the battery cell includes shell, electrode assembly and cover plate assembly 10, the top of shell is provided with opening, electrode assembly is placed in the inside, cover plate assembly 10 is closed on opening, and with shell fixed connection, and the lug of electrode assembly is electrically connected with the pole post 12 in cover plate assembly 10, it needs to be explained, cover plate assembly 10 is similar or identical with the structure of cover plate assembly 10 described in the above embodiment, to avoid repetition, here no longer repeat.

[0043] The utility model proposes a kind of cover plate assembly and battery cell, at least one sealing ring is installed between lower plastic and cover plate body and between lower plastic and pole post base respectively, to prevent external electrolyte from entering cavity, to ensure the safety of battery cell;Meanwhile, the newly added sealing ring can also be used as backup sealing ring in the case of L type sealing ring failure, to ensure the sealing property of battery cell, improve the safety of battery cell.

[0044] The above-described embodiments are merely used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features thereof can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

[0045] In addition to the technical features described in the specification, the remaining technical features are known to those skilled in the art, and in order to highlight the innovative features of the present application, the remaining technical features will not be described here.

Claims

1. A cover plate assembly, characterized by The cover plate assembly comprises: a cover plate body, a lower plastic on one side of the cover plate, and a pole column comprising a columnar body penetrating through the lower plastic and the cover plate body, and a pole base on the side of the lower plastic away from the cover plate body; a first sealing ring between the lower plastic and the cover plate body; a second sealing ring between the lower plastic and the pole base of the pole column; the first sealing ring and the second sealing ring are arranged around the columnar body.

2. The cover plate assembly of claim 1, wherein, The bottom surface of the cover plate body and the top surface of the lower plastic are correspondingly provided with first grooves, the side of the pole base facing the cover plate body and the bottom surface of the lower plastic are correspondingly provided with second grooves, the first grooves are provided with the first sealing ring, and the second grooves are provided with the second sealing ring.

3. The cover plate assembly of claim 2, wherein, The bottom surface of the cover plate body and / or the top surface of the lower plastic are further correspondingly provided with third grooves, the third grooves are located on one side of the first grooves and form stepped grooves with the first grooves; the side of the pole base facing the cover plate body and / or the bottom surface of the lower plastic are further correspondingly provided with fourth grooves, the fourth grooves are located on one side of the second grooves and form stepped grooves with the second grooves.

4. The cover plate assembly of claim 3, wherein, The total height of the first grooves is less than the height of the first sealing ring before compression, the total height of the second grooves is less than the height of the second sealing ring before compression, part of the first sealing ring is located in the third grooves after compression, and part of the second sealing ring is located in the fourth grooves after compression.

5. The cover plate assembly of claim 4, wherein, The compression amount of the first sealing ring and the second sealing ring is set to be between 15% and 45%.

6. The cover plate assembly of claim 3, wherein, The depth of the third grooves is less than the depth of the first grooves, and the depth of the fourth grooves is less than the depth of the second grooves.

7. The cover plate assembly of claim 3, wherein, The width of the third grooves and the fourth grooves is at least 0.2mm larger than the outer diameter of the corresponding sealing ring.

8. The cover plate assembly of claim 3, wherein, The first grooves and the third grooves on the bottom surface of the cover plate body and the first grooves and the third grooves on the top surface of the lower plastic are symmetrically arranged about the contact surface between the cover plate body and the lower plastic; the second grooves and the fourth grooves on the pole base and the second grooves and the fourth grooves on the bottom surface of the lower plastic are symmetrically arranged about the contact surface between the lower plastic and the pole base.

9. The cover plate assembly of claim 1, wherein, The outer diameter of the first sealing ring and the second sealing ring is less than the width of the lower plastic, and the inner diameter of the first sealing ring and the second sealing ring is greater than the diameter of the pole column through hole on the lower plastic.

10. An electric cell characterized by The cover plate assembly comprises: a housing, an electrode assembly installed in the housing; the cover plate assembly of any one of claims 1 to 9 is fixedly connected with the housing, and the pole column of the cover plate assembly is electrically connected with the electrode assembly.

Images