Battery cell top cover and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cell top cover and a battery. The battery cell top cover comprises a top cover piece and an anti-explosion valve, the top cover piece is provided with a first surface and a second surface which are oppositely arranged, the top cover piece is provided with an assembly area, the assembly area is provided with a hollow containing cavity, the assembly area comprises a flanging part formed on the first surface or the second surface and a step part formed on the surface opposite to the surface where the flanging part is located, and the anti-explosion valve is arranged on the step part. An accommodating cavity is defined by the step part and the flanging part; the anti-explosion valve is contained in the containing cavity and comprises a breathing buffering part located at the center position, a connecting part annularly arranged on the breathing buffering part and an explosion part located at the joint of the breathing buffering part and the connecting part and provided with nicks, the connecting part is attached to the step part and riveted to the flanging part, and the breathing buffering part is in a wave wrinkle shape. According to the explosion-proof valve, the influence of welding on the performance of the explosion-proof valve can be avoided, and gas storage and buffering effects are achieved after gas is generated during charging and discharging of the battery.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a kind of top cover of battery cell and battery. BACKGROUND

[0002] Battery product is indispensable spare part as new energy equipment, widely enters the vision and life of everybody, such as electric vehicle, household energy storage, portable battery, digital battery etc.. Because battery is closer and closer to people, safety is certainly the most important, battery explosion-proof valve is the key component of battery safety, when battery heat runaway occurs, a large amount of gas will be generated in battery in short time, explosion-proof valve can discharge battery internal gas in time, avoid the explosion caused by excessive internal pressure of battery.

[0003] Existing explosion-proof valve includes two parts: welding part and bursting part, welding part is relatively thick, for welding together with top cover sheet;Bursting part has notch, and it is the weak part of explosion-proof valve. When the internal pressure of battery reaches a certain degree, the notch will break, realize pressure relief, avoid the explosion caused by excessive internal pressure of battery.

[0004] However, the battery explosion-proof valve of related technology has the following problems:

[0005] 1, explosion-proof valve is assembled on top cover sheet by welding method, high temperature of welding can reduce the bursting value of explosion-proof valve, poor welding leads to gas leakage of explosion-proof valve, and welding can produce slag, and the slag has the risk of falling into the inside of battery cell and damaging battery cell;

[0006] 2, gas may be produced during the charging and discharging process of battery, and the internal gas of battery can cause battery bulging, affect battery assembly and battery safety;

[0007] 3, battery cell has no early warning when a large amount of heat and gas are produced, and there is a safety risk. INVENTION CONTENTS

[0008] The utility model provides a kind of top cover of battery cell and battery, can avoid the influence of welding on the performance of explosion-proof valve, also can play the role of gas storage and buffering after battery charging and discharging gas, avoid the problems such as battery large area bulging and assembly defect caused thereby.

[0009] To solve the above technical problems, one technical scheme of the utility model is to provide a kind of top cover of battery cell, comprising:

[0010] A top cover sheet has a first surface and a second surface oppositely arranged, and is provided with a fitting area penetrating through the first surface and the second surface, the fitting area has a hollow accommodating cavity, and the fitting area comprises a flange part formed on the first surface or the second surface and a step part formed on the opposite surface of the flange part, and the step part and the flange part surround the accommodating cavity;

[0011] An explosion-proof valve is accommodated in the accommodating cavity, the explosion-proof valve comprises a breathing buffer part located at a center position, a connecting part annularly arranged around the breathing buffer part, and an explosion part located at a connection between the breathing buffer part and the connecting part and having a notch, the connecting part is attached to the step part and riveted with the flange part, and the breathing buffer part is arranged in a wave-creped shape.

[0012] According to an embodiment of the present application, the top cover of the battery cell further comprises an inductive finger for inducting the deformation amount of the breathing buffer part, one end of the inductive finger is fixed to the top cover sheet, and the other end is connected to the breathing buffer part.

[0013] According to an embodiment of the present application, the top cover of the battery cell further comprises at least one first sealing member arranged between the step part and the connecting part.

[0014] According to an embodiment of the present application, the top cover of the battery cell further comprises an upper plastic arranged above the top cover sheet and attached to the first surface, a lower plastic arranged below the top cover sheet and attached to the second surface, and a pole post penetrating through the top cover sheet and connected to the upper plastic and the lower plastic respectively.

[0015] According to an embodiment of the present application, the top cover sheet is provided with a first pole post hole located at one side of the fitting area and a second pole post hole located at the other side of the fitting area; and the pole post comprises a first pole post penetrating through the first pole post hole and a second pole post penetrating through the second pole post hole.

[0016] According to an embodiment of the present application, the upper plastic comprises a first upper plastic matched with the first pole post and a second upper plastic matched with the second pole post, and the first upper plastic and the second upper plastic are arranged independently.

[0017] According to an embodiment of the present application, the lower plastic is provided with a first through hole corresponding to the first pole post hole and a second through hole corresponding to the second pole post hole; the first pole post penetrates through the first through hole, the first pole post hole and is connected to the first upper plastic in sequence, and the second pole post penetrates through the second through hole, the second pole post hole and is connected to the second upper plastic in sequence.

[0018] According to one embodiment of the utility model, the top cover of the battery cell further comprises a second sealing member sleeved outside the first pole and a third sealing member sleeved outside the second pole.

[0019] According to one embodiment of the utility model, the top cover of the battery cell further comprises a protective sheet sleeved on the explosion-proof valve.

[0020] To solve the above technical problems, another technical scheme of the utility model is provided: a battery comprises the top cover of the battery cell.

[0021] The utility model discloses beneficial effect is: a kind of top cover of battery cell includes: top cover sheet and explosion-proof valve, the top cover sheet has oppositely arranged first surface and second surface, the top cover sheet is equipped with the assembly area that passes through the first surface and second surface, the assembly area has hollow accommodating cavity, the assembly area includes the flange portion formed in the first surface or the second surface and the step portion formed in the opposite surface of the flange portion, the step portion and the flange portion are surrounded to form the accommodating cavity;The explosion-proof valve is housed in the accommodating cavity, the explosion-proof valve includes the breathing buffer portion in central position, the connecting portion annularly arranged in the breathing buffer portion and the burst portion with score at the connecting portion of the breathing buffer portion and the connecting portion, the connecting portion is attached to the step portion and is riveted with the flange portion, the breathing buffer portion is set as wave pleats shape;The flange portion of the connecting portion of explosion-proof valve and assembly area riveting, can avoid the influence of welding on the performance of explosion-proof valve, the breathing buffer portion is set as wave pleats shape, when battery charging and discharging gas but not reach the burst gas pressure of explosion-proof valve, the wave pleats part of breathing buffer portion is supported by battery internal pressure, plays the role of buffer, avoids battery aluminum shell distension and the problem such as assembly failure caused thereby. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the three-dimensional structure schematic diagram of the top cover of battery cell of one embodiment of the utility model;

[0023] Figure 2 It is Figure 1 the exploded view schematic diagram of;

[0024] Figure 3 It is the second surface structure schematic diagram of top cover sheet of one embodiment of the utility model;

[0025] Figure 4 It is Figure 1 sectional view along A-A direction line;

[0026] Figure 5 It is Figure 4 the local enlarged schematic diagram of B area of;

[0027] Figure 6 is a perspective structural schematic view of the explosion-proof valve of an embodiment of the present application;

[0028] Figure 7 is a schematic view of one state of the top cover of the battery cell of an embodiment of the present application;

[0029] Figure 8 is a schematic view of another state of the top cover of the battery cell of an embodiment of the present application.

[0030] The meanings of the respective reference numerals in the drawings are as follows:

[0031] 100 - top cover of the battery cell; 10 - top cover sheet; 20 - explosion-proof valve; 30 - upper plastic; 40 - lower plastic; 50 - pole; 60 - first sealing member; 70 - second sealing member; 80 - third sealing member; 90 - protective sheet; 110 - inductive contact finger; 11 - first surface; 12 - second surface; 13 - assembly area; 114 - first pole hole; 15 - second pole hole; 130 - accommodating cavity; 131 - flange portion; 132 - step portion; 21 - breathing buffer portion; 22 - connecting portion; 23 - bursting portion; 301 - first upper plastic; 302 - second upper plastic; 401 - first through hole; 402 - second through hole; 501 - first pole; 502 - second pole. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0033] The terms "first", "second", "third" in the present application are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second", "third" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0034] Reference to "an embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be incorporated into any other embodiment.

[0035] Figure 1 is a perspective structural schematic view of a top cover of a battery cell according to an embodiment of the application, Figure 2 is Figure 1 is an exploded structural schematic view of the top cover of the battery cell. As shown in Figures 1-2 , the top cover 100 includes a top cover sheet 10, an explosion-proof valve 20, an upper plastic 30, a lower plastic 40, and a pole 50. The top cover sheet 10 has a first surface 11 and a second surface 12 disposed opposite to each other. The upper plastic 30 is attached to the first surface 11 of the top cover sheet 10, the lower plastic 40 is attached to the second surface 12 of the top cover sheet 10, and the pole 50 penetrates through the top cover sheet 10 and is connected to the upper plastic 30 and the lower plastic 40, respectively.

[0036] Further, referring to Figure 2 , the top cover sheet 10 is provided with an assembly area 13 penetrating through the first surface 11 and the second surface 12. The assembly area 13 can be formed by stamping / extruding processing of the top cover sheet 10. Referring to Figure 3 , the assembly area 13 has a hollow accommodating cavity 130, and the assembly area 13 includes a flange portion 131 formed on the first surface 11 or the second surface 12 and a step portion 132 formed on the opposite surface of the surface where the flange portion 131 is located. As an embodiment, referring to Figure 3 , the assembly area 13 includes the flange portion 131 protruding from one side of the second surface 12 away from the first surface 11 and the step portion 132 formed in the accommodating cavity 130 and extending towards the central part of the accommodating cavity 130, and the step portion 132 and the flange portion 131 surround the accommodating cavity 130. In another embodiment, the assembly area 13 includes the flange portion 131 protruding from one side of the first surface 11 away from the second surface 12 and the step portion 132 formed in the accommodating cavity 130 and extending towards the central part of the accommodating cavity 130, and the step portion 132 and the flange portion 131 surround the accommodating cavity 130.

[0037] Further, referring to Figure 2 , the top cover sheet 10 is provided with a first pole hole 14 located at one side of the assembly area 13 and a second pole hole 15 located at the other side of the assembly area 13.

[0038] Referring to Figure 2 , Figure 4 and Figure 5The explosion-proof valve 20 is accommodated in the accommodating cavity 130. Please refer to Figure 6 The explosion-proof valve 20 comprises a breathing buffer part 21 located at a center position, a connecting part 22 annularly arranged at the breathing buffer part 21, and a burst part 23 located at a connection between the breathing buffer part 21 and the connecting part 22 and having a notch. The explosion-proof valve 20 can be manufactured by stamping, stretching, profiling and the like.

[0039] The notch is a weak part of the explosion-proof valve 20 and can be circular, oval, square and the like. The notch of the burst part 23 can be broken in time to realize pressure relief when the explosion-proof valve 20 reaches a certain air pressure. The breathing buffer part 21 is designed in a wave-creased shape. When the battery generates gas during charging and discharging but does not reach the burst air pressure of the explosion-proof valve 20, the wave-creased part will be lifted by the internal air pressure of the battery, playing a buffering role and avoiding the swelling of the battery aluminum shell, thus ensuring the safety of the battery and prolonging the service life of the explosion-proof valve 20 to a certain extent, thereby improving the overall service life of the battery.

[0040] When the explosion-proof valve 20 is assembled, the connecting part 22 is attached to the stepped part 132 and is riveted with the flange part 131, that is, riveting can be performed from the first surface 11 of the top cover sheet 10 or from the second surface 12 of the top cover sheet 10 (as shown in Figure 4 ), which can avoid the influence of welding on the performance of the explosion-proof valve 20 and improve the safety of the battery.

[0041] Further, please refer to Figure 1 , Figure 2 and Figure 4 The pole 50 comprises a first pole 501 arranged through the first pole hole 14 and a second pole 502 arranged through the second pole hole 15. The first pole hole 14 is used for mounting a positive pole or a negative pole, and the second pole hole 15 is used for mounting a positive pole or a negative pole. The first pole 501 and the second pole 502 have different polarities, which can be understood as the polarities of the poles mounted in the first pole hole 14 and the second pole hole 15 being opposite.

[0042] Further, please refer to Figure 1 and Figure 2 The upper plastic 30 comprises a first upper plastic 301 matched with the first pole 501 and a second upper plastic 302 matched with the second pole 505. The first upper plastic 301 and the second upper plastic 302 are independently arranged.

[0043] Further, please refer to Figure 1 and Figure 2The lower plastic 40 is provided with a first through hole 401 corresponding to the first pole post hole 14 and a second through hole 402 corresponding to the second pole post hole 15. During installation, the first pole post 501 passes through the first through hole 401, the first pole post hole 14 and is connected with the first upper plastic 301 in sequence, and the second pole post 502 passes through the second through hole 402, the second pole post hole 15 and is connected with the second upper plastic 302 in sequence.

[0044] Further, please refer to Figure 2 and Figure 5 The top cover 100 of the battery cell further comprises at least one first sealing member 60 arranged between the stepped portion 132 and the connecting portion 22. The first sealing member 60 can increase the sealing property of the connecting portion between the stepped portion 132 and the connecting portion 22. In this embodiment, one first sealing member 60 is arranged in the assembly area 13, and in other embodiments, two or more first sealing members 60 can be arranged to ensure the sealing property. The first sealing member 60 can be a rubber pad.

[0045] Please refer to Figure 2 and Figure 5 The top cover 100 of the battery cell further comprises a second sealing member 70 sleeved outside the first pole post 501 and a third sealing member 80 sleeved outside the second pole post 502. The second sealing member 70 and the third sealing member 80 can be rubber pads. The second sealing member 70 can increase the sealing property between the first pole post 501 and the first upper plastic 301 and the lower plastic 40. The third sealing member 80 can increase the sealing property between the second pole post 502 and the second upper plastic 302 and the lower plastic 40.

[0046] Further, please refer to Figure 1 The top cover 100 of the battery cell further comprises a protective sheet 90 arranged on the explosion-proof valve 20. The protective sheet 90 protects the explosion-proof valve 20.

[0047] Further, please refer to Figure 7 and Figure 8 The top cover 100 of the battery cell further comprises a sensing finger 110 for sensing the deformation amount of the breathing buffer portion 21. One end of the sensing finger 110 is fixed on the top cover sheet 10, and the other end is connected with the breathing buffer portion 21. In this embodiment, the sensing finger 110 is connected with a processor. When gas is generated inside the battery, the breathing buffer portion 21 of the explosion-proof valve 20 will be inflated, and the inflation degree will increase with the increase of the gas pressure. The end of the sensing finger 110 in contact with the breathing buffer portion 21 will also rotate with the deformation of the breathing buffer portion 21 (as shown in FIG. 6). Figure 8The greater the deformation amount of the breathing buffer portion 21 is, the greater the rotation angle of the sensing feeler 110 is; the sensing feeler 110 transmits the rotation angle information to the processor through an electric signal, and the corresponding battery internal pressure value is obtained through the processor processing; when the pressure value reaches a certain degree, an alarm is given, early warning is given, which is beneficial to early identification of risks of the battery system and safe control of the battery system.

[0048] The utility model embodiment further provides a battery, the battery includes the above-mentioned battery cell top cover 100. The assembly procedure of the battery is as follows: please refer to Figures 2-5 The first sealing member 60 is assembled on the assembly area 13 of the top cover sheet 10, then the explosion-proof valve 20 is accommodated in the accommodating cavity 130, the flange portion 131 of the assembly area 13 is pressed towards the connecting portion 22 of the explosion-proof valve 20, the first sealing member 60 has a compression amount of more than 25%, the sealing and fastening of the explosion-proof valve 20 are realized; after the assembly of the top cover sheet 10 and the explosion-proof valve 20 is completed, then the top cover sheet 10, the second sealing member 70, the third sealing member 80, the first pole 501, the second pole 502, the first upper plastic 301, the second upper plastic 302 and the lower plastic 40 are assembled into a top cover; finally, the top cover, the shell and the roll core are assembled together. The battery of the utility model embodiment is riveted through the connecting portion of the explosion-proof valve and the flange portion of the assembly area, the influence of welding on the performance of the explosion-proof valve can be avoided, the breathing buffer portion is arranged in a wave wrinkle shape, when the battery generates gas during charging and discharging but the gas pressure does not reach the explosion pressure of the explosion-proof valve, the wave wrinkle portion of the breathing buffer portion is lifted by the internal gas pressure of the battery, the buffering effect is achieved, the problems such as swelling of the battery aluminum shell and assembly failure caused by the swelling are avoided.

[0049] The above is only the embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structure or equivalent process conversion using the contents of the utility model specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection range of the utility model.

Claims

1. An electrode top cap, characterized by, The electric cell top cover comprises: a top cover sheet having a first surface and a second surface arranged oppositely, the top cover sheet being provided with an assembly area penetrating the first surface and the second surface, the assembly area having a hollow accommodating cavity, the assembly area comprising a flange part formed on the first surface or the second surface and a step part formed on the opposite surface of the flange part, the step part and the flange part surrounding the accommodating cavity; an explosion-proof valve accommodated in the accommodating cavity, the explosion-proof valve comprising a breathing buffer part located at a center position, a connecting part surrounding the breathing buffer part, and an explosion part having a notch at the connection between the breathing buffer part and the connecting part, the connecting part being attached to the step part and riveted with the flange part, the breathing buffer part being arranged in a wave-pleated shape.

2. The top cover of the battery cell according to claim 1, wherein, The electric cell top cover further comprises a sensing finger for sensing the deformation amount of the breathing buffer part, one end of the sensing finger being fixed to the top cover sheet and the other end being connected to the breathing buffer part.

3. The top cover of the battery cell according to claim 1, wherein, The electric cell top cover further comprises at least one first sealing member arranged between the step part and the connecting part.

4. The top cover of the battery cell according to claim 1, wherein, The electric cell top cover further comprises an upper plastic arranged above the top cover sheet and attached to the first surface, a lower plastic arranged below the top cover sheet and attached to the second surface, and a pole post penetrating the top cover sheet and connected to the upper plastic and the lower plastic respectively.

5. The top cover of the battery cell according to claim 4, wherein, The top cover sheet is provided with a first pole post hole on one side of the assembly area and a second pole post hole on the other side of the assembly area; the pole post comprises a first pole post penetrating the first pole post hole and a second pole post penetrating the second pole post hole.

6. The top cover of the battery cell according to claim 5, wherein, The upper plastic comprises a first upper plastic matched with the first pole post and a second upper plastic matched with the second pole post, the first upper plastic and the second upper plastic being arranged independently.

7. The top cover of the battery cell according to claim 6, wherein The lower plastic is provided with a first through hole corresponding to the first pole post hole and a second through hole corresponding to the second pole post hole; the first pole post penetrates the first through hole, the first pole post hole and is connected to the first upper plastic in sequence, and the second pole post penetrates the second through hole, the second pole post hole and is connected to the second upper plastic in sequence.

8. The top cover of the battery cell according to claim 7, wherein, The electric cell top cover further comprises a second sealing member sleeved on the outer side of the first pole post and a third sealing member sleeved on the outer side of the second pole post.

9. The top cover of the battery cell of claim 1, wherein, The electric cell top cover further comprises a protective sheet sleeved on the explosion-proof valve.

10. A battery, characterized by The electric cell top cover comprises the electric cell top cover according to any one of claims 1-9.

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