Cover plate assembly for battery cell and battery cell with cover plate assembly

Abstract

The utility model discloses a cover plate assembly for a battery cell and the battery cell with the cover plate assembly, the cover plate assembly comprises a cover plate body, a pole mounting hole is formed on the cover plate body, and the cover plate body is provided with a first sealing surface and a second sealing surface which are arranged in a stepped manner in the thickness direction; the first insulating part is arranged on the end face of one side of the cover plate body in the thickness direction, and a first through hole corresponding to the pole mounting hole is formed in the first insulating part; and the terminal post penetrates through the terminal post mounting hole and the first through hole so as to be suitable for fixing the first insulating part on the cover plate body, so that the first insulating part is respectively connected with the first sealing surface and the second sealing surface in a sealing manner. According to the cover plate assembly designed by the utility model, the sealing performance of the battery cell can be improved, and the use safety of the battery cell is ensured.

Description

Technical Field

[0001] The utility model relates to the field of batteries, in particular to a cover plate assembly for a battery cell and a battery cell having the cover plate assembly. Background Art

[0002] In the related art, the shell structure of the cylindrical battery defines a receiving cavity inside, and the receiving cavity is suitable for arranging the winding core. The shell structure is generally open at one end so that the winding core can be placed in the receiving cavity, and the cover plate assembly is suitable for covering the open end of the shell structure. As a major component of the battery, the sealing and connection stability between the cover plate assembly and the shell structure can increase the safety performance of the battery and the practical performance such as convenient and quick assembly.

[0003] In the prior art, the pole in the cover plate assembly and the cover plate body in the cover plate assembly are generally connected by riveting, which is prone to poor sealing and also poses a safety hazard of battery cell leakage. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to propose a cover plate assembly for a battery cell. The cover plate assembly designed according to the utility model can improve the sealing performance of the battery cell and ensure the safety of the battery cell.

[0005] The utility model also provides a battery core having the cover plate assembly.

[0006] According to the utility model, the cover plate assembly includes: a cover plate body, a pole mounting hole is formed on the cover plate body, and the cover plate body is provided with a first sealing surface and a second sealing surface arranged in a stepped manner in the thickness direction; a first insulating member, the first insulating member is arranged on the end surface of one side of the thickness direction of the cover plate body, and the first insulating member is formed with a first through hole corresponding to the pole mounting hole; a pole, the pole passes through the pole mounting hole and the first through hole, so as to be suitable for fixing the first insulating member on the cover plate body, so that the first insulating member is respectively sealed and connected with the first sealing surface and the second sealing surface.

[0007] According to the cover assembly of the utility model, a first sealing surface and a second sealing surface arranged in a stepped manner are arranged in the thickness direction of the cover body, so that the cover body can be sealed and matched with the first insulating member multiple times in the thickness direction, thereby better sealing the gap between the pole and the cover body, improving the sealing performance of the battery cell, ensuring the normal use of the battery cell, and more effectively separating the inside of the battery cell from the outside of the battery cell, preventing the medium inside the battery cell from flowing to the outside of the battery cell when the battery cell leaks, thereby ensuring the safe use of the battery cell.

[0008] According to some embodiments of the utility model, a first groove portion suitable for accommodating the first insulating member is formed on the end surface of the cover plate body, the bottom surface of the first groove portion is configured as the first sealing surface, the first sealing surface is provided with a first sealing component, and one side surface of the first sealing component in the thickness direction is configured as the second sealing surface; the first insulating member is provided with a second sealing component that is in surface contact with the first sealing component; wherein one of the first sealing component and the second sealing component is configured as a groove, and the other of the first sealing component and the second sealing component is configured as a protrusion.

[0009] According to some embodiments of the present invention, the first sealing component is configured as a second groove portion formed on the bottom surface of the first groove portion, the bottom surface of the second groove portion forms the second sealing surface, and the second sealing component protrudes toward the second groove portion.

[0010] According to some embodiments of the present invention, the thickness of the second sealing component is d1, the thickness of the first insulating component is d2, and the following condition is satisfied: 0.1≤d1 / d2≤0.8.

[0011] According to some embodiments of the present invention, the depth of the second groove portion is d3, the thickness of the cover plate body is d4, and the following relationship is satisfied: 0.1≤d3 / d4≤0.8.

[0012] According to some embodiments of the utility model, the cover plate assembly for the battery cell further includes: a second insulating member, which is arranged on the other side of the cover plate body in the thickness direction, and the second insulating member is formed with a second through hole that cooperates with the pole.

[0013] According to some embodiments of the utility model, the pole includes: a base portion, which cooperates with the second insulating member; a column portion, which is arranged on one side of the base portion in the thickness direction and passes through the second insulating member, the cover plate body and the first insulating member in sequence; wherein the cross-sectional area of ​​the base portion is larger than the cross-sectional area of ​​the column portion.

[0014] According to some embodiments of the present invention, the cover plate assembly for the battery cell further includes: a sealing member, which is sleeved on the outer periphery of the column portion and located between the first insulating member and the base portion.

[0015] According to some embodiments of the present invention, an anti-dropping block is provided at the end of the pole, and a third groove portion suitable for accommodating the anti-dropping block is formed on the top surface of the first insulating member.

[0016] According to some embodiments of the present invention, a protruding structure protruding away from the cover plate body is formed on the outer periphery of the first insulating member, and the protruding structure is arranged around the pole and defines the third groove portion with the surface on one side of the first insulating member in the thickness direction.

[0017] According to some embodiments of the present invention, a fourth groove portion surrounding the second through hole is formed on the other side of the thickness of the second insulating member, and the base portion is accommodated in the fourth groove portion.

[0018] According to some embodiments of the present invention, the pole is configured in multiple numbers.

[0019] The following briefly describes a battery cell according to another embodiment of the present invention.

[0020] The battery cell according to the utility model comprises: a housing, wherein a cavity for accommodating a pole piece is defined in the housing; a pole piece, wherein the pole piece is accommodated in the cavity; and a cover plate assembly, wherein the cover plate assembly is constructed as any one of the above embodiments, and the pole of the cover plate assembly is electrically connected to the pole piece. Since the battery cell according to the utility model is provided with the cover plate assembly of the above embodiment, the battery cell has good sealing performance and is safer to use.

[0021] According to some embodiments of the utility model, the battery core further includes: a through piece, which is accommodated in the accommodating cavity and penetrates the cover plate assembly, and a through channel suitable for circulating the heat dissipation medium is formed inside the through piece.

[0022] According to some embodiments of the present invention, a third through hole is formed on the cover body, the third through hole is welded to the outer periphery of the through piece, and a fifth groove surrounding the third through hole is formed on the top surface of the cover body.

[0023] According to some embodiments of the present invention, the depth of the fifth groove is d5, the thickness of the cover plate body is d4 and satisfies: 0.1≤d5 / d4≤0.2.

[0024] To sum up, according to the cover assembly of the utility model, the cover body can be sealed and matched with the first insulating member in the thickness direction for multiple times to seal the gap between the pole and the cover body, so that the sealing performance of the battery cell is better, and the inside of the battery cell and the outside of the battery cell can be more effectively separated to avoid leakage of the battery cell to the outside of the battery cell, thereby ensuring the safe use of the battery cell.

[0025] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0027] Figure 1 It is a schematic diagram of the overall structure of a battery cell according to an embodiment of the utility model.

[0028] Figure 2 It is an exploded view of a cover plate assembly according to an embodiment of the utility model.

[0029] Figure 3 It is a partial cross-sectional view of the cover plate assembly according to an embodiment of the utility model when it is mated.

[0030] Figure 4 It is a structural diagram of a cover body according to an embodiment of the utility model.

[0031] Figure 5 yes Figure 4 Another perspective on the structure.

[0032] Figure 6 It is a pole structure diagram according to an embodiment of the utility model.

[0033] Figure 7 It is a structural diagram of a first insulating member according to an embodiment of the utility model.

[0034] Figure 8 yes Figure 7 Another perspective on the structure.

[0035] Fig. 9 yes Figure 1 Schematic diagram of the internal structure of the medium structure.

[0036] Fig.10 yes Fig. 9 Another perspective on the structure.

[0037] Fig.11 yes Fig.10 The middle circle shows an enlarged view of point A.

[0038] Reference numerals:

[0039] 1. Battery cell;

[0040] 10. housing; 10a. accommodating cavity;

[0041] 30. Cover plate assembly;

[0042] 31, cover plate body; 31a, pole mounting hole; 31b, first groove; 311, first sealing surface; 31c, second groove; 312, second sealing surface; 31d, third through hole; 31e, fifth groove; 31f, injection hole;

[0043] 32, first insulating member; 32a, first through hole; 32b, third groove; 321, second sealing member; 322, protruding structure;

[0044] 33, pole; 331, base; 332, column; 333, head; 334, anti-drop block; 334a, fixing hole;

[0045] 34, second insulating member; 34a, second through hole; 34b, fourth groove portion; 34c, thinning area; 34d, communication hole;

[0046] 35. sealing member; 35a. through hole;

[0047] 40. Through piece; 40a. Through passage. DETAILED DESCRIPTION

[0048] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0049] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0050] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0051] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0053] In the related art, the shell structure of the cylindrical battery defines a receiving cavity inside, and the receiving cavity is suitable for arranging the winding core. The shell structure is generally open at one end so that the winding core can be placed in the receiving cavity, and the cover plate assembly is suitable for covering the open end of the shell structure. As a major component of the battery, the sealing and connection stability between the cover plate assembly and the shell structure can increase the safety performance of the battery and the practical performance such as convenient and quick assembly.

[0054] In the prior art, the pole in the cover plate assembly and the cover plate body in the cover plate assembly are generally connected by riveting, which is prone to poor sealing and also poses a safety hazard of battery cell leakage.

[0055] Reference below Figure 1-Figure 11 A cap plate assembly 30 for a battery cell 1 according to an embodiment of the present invention is described.

[0056] like Figure 1-Figure 11As shown, the cover assembly 30 according to the utility model is used for the battery cell 1 and includes: a cover body 31, a first insulating member 32 and a pole 33, a pole mounting hole 31a is formed on the cover body 31, and the cover body 31 is provided with a first sealing surface 311 and a second sealing surface 312 arranged in a step-like manner in the thickness direction; the first insulating member 32 is arranged on the end surface of one side of the thickness direction of the cover body 31, and the first insulating member 32 is formed with a first through hole 32a corresponding to the pole mounting hole 31a; the pole 33 passes through the pole mounting hole 31a and the first through hole 32a, so as to be suitable for fixing the first insulating member 32 on the cover body 31, so that the first insulating member 32 is sealed and connected with the first sealing surface 311 and the second sealing surface 312 respectively.

[0057] Specifically, the electrode of the battery cell 1 is generally electrically connected to other structures through the electrode 33. One end of the electrode 33 is located inside the battery cell 1 to be electrically connected to the electrode, and the other end of the electrode 33 extends to the outside of the battery cell 1 through the electrode mounting hole 31a on the cover body 31 to be electrically connected to other structures outside the battery cell 1. Therefore, there is a gap between the electrode 33 and the cover body 31. At this time, the sealing of the battery cell 1 is poor, and substances outside the battery cell 1 can easily enter the battery cell 1 through the gap, affecting the normal use of the battery cell 1; when the battery cell 1 leaks, the medium inside the battery cell 1 will also flow out of the gap to the outside of the battery cell 1. Such battery cell 1 has poor safety.

[0058] Therefore, a first insulating member 32 is provided to fill the gap between the pole 33 and the cover body 31, and to ensure the filling effect, a first sealing surface 311 and a second sealing surface 312 are provided on the cover body 31. When the first insulating member 32 cooperates with the cover body 31 and the pole 33, it can be sealed and connected with the first sealing surface 311 and the second sealing surface 312.

[0059] More specifically, the first insulating member 32 cooperates with the cover body 31 in the thickness direction, and therefore the first sealing surface 311 and the second sealing surface 312 are designed to be spaced apart in the thickness direction of the cover body 31, so that the first insulating member 32 can be sealed and cooperated with the cover body 31 multiple times in the thickness direction, thereby improving the sealing effect of the first insulating member 32 on the gap between the pole 33 and the cover body 31.

[0060] According to the cover assembly 30 of the utility model, a first sealing surface 311 and a second sealing surface 312 arranged in a stepped manner are arranged in the thickness direction of the cover body 31, so that the cover body 31 can be sealed and matched with the first insulating member 32 multiple times in the thickness direction, thereby better sealing the gap between the pole 33 and the cover body 31, improving the sealing performance of the battery cell 1, ensuring the normal use of the battery cell 1, and more effectively separating the inside of the battery cell 1 from the outside of the battery cell 1, preventing the medium inside the battery cell 1 from flowing to the outside of the battery cell 1 when the battery cell 1 leaks, thereby ensuring the safe use of the battery cell 1.

[0061] In some embodiments, the first insulating member 32 is made of an insulating material to prevent the first insulating member 32 from conducting electricity when in cooperation with the pole 33 , thereby preventing leakage of the battery cell 1 during use and ensuring the safety of the battery cell 1 .

[0062] According to some embodiments of the present invention, Figure 4 As shown, the end surface of the cover body 31 is formed with a first groove portion 31b suitable for accommodating the first insulating member 32, the bottom surface of the first groove portion 31b is configured as a first sealing surface 311, the first sealing surface 311 is provided with a first sealing component, and one side surface of the first sealing component in the thickness direction is configured as a second sealing surface 312; the first insulating member 32 is provided with a second sealing component 321 in surface contact with the first sealing component; wherein one of the first sealing component and the second sealing component 321 is configured as a groove, and the other of the first sealing component and the second sealing component 321 is configured as a protrusion. Specifically, the end surface of one side of the cover body 31 in the thickness direction is formed with a first groove portion 31b, the bottom surface of the first groove portion 31b is the above-mentioned first sealing surface 311, and the first insulating member 32 is arranged in the first groove portion 31b to achieve sealing cooperation with the first sealing surface 311. Here, a first sealing component is provided on the first sealing surface 311 , and a second sealing surface 312 is designed on the first sealing component, so that the first insulating member 32 can cooperate with the first sealing surface 311 and the second sealing member 35 at the same time.

[0063] In some embodiments, the first sealing component on the cover body 31 and the second sealing component 321 on the first insulating member 32 abut against each other on two surfaces in the thickness direction of the cover body 31 to achieve further sealing. Here, the first sealing component and the second sealing component 321 can be a groove and a protrusion respectively, so that the first sealing component and the second sealing component 321 cooperate to achieve positioning between the cover body 31 and the first insulating member 32, and facilitate the subsequent connection and cooperation between the first sealing component and the second sealing component 321, and the surface where the groove and the protrusion abut against each other is the second sealing surface 312 and the surface on the first insulating member 32 that is directly opposite to the second sealing surface 312.

[0064] According to some embodiments of the present invention, Figure 4 As shown, the first sealing component is configured as a second groove portion 31c formed on the bottom surface of the first groove portion 31b, the bottom surface of the second groove portion 31c forms a second sealing surface 312, and the second sealing component 321 protrudes toward the second groove portion 31c. Specifically, the first sealing component is configured as a groove, and the second sealing component 321 is configured as a protrusion. When the first sealing component and the second sealing component 321 are matched, the second sealing component 321 is accommodated in the first sealing component. The first sealing component is as shown in FIG. Figure 4As shown in the second groove portion 31 c, when the second sealing component 321 is received in the second groove portion 31 c, the upper surface of the second sealing component 321 in the thickness direction of the cover body 31 stops contacting with the second sealing surface 312 to achieve further sealing.

[0065] In some embodiments, when the first insulating member 32 is received in the first groove portion 31 b , one side surface of the first insulating member 32 in the thickness direction contacts the first sealing surface 311 , and the second sealing component 321 is also protrudingly provided on one side surface of the first insulating member 32 in the thickness direction.

[0066] In some embodiments, the second sealing member 321 may be configured as an annular boss structure protruding from a surface of one side of the first insulating member 32 in the thickness direction.

[0067] In some embodiments, the second sealing member 321 may be configured as a plurality of protrusions protruding from a surface of one side of the first insulating member 32 in the thickness direction, and the plurality of protrusions are arranged at intervals.

[0068] According to some embodiments of the present invention, Figure 8 As shown, the thickness of the second sealing component 321 is d1, and the thickness of the first insulating member 32 is d2, and they satisfy: 0.1≤d1 / d2≤0.8. Specifically, the second sealing component 321 is protrudingly arranged on one side of the first insulating member 32 in the thickness direction. To ensure the overall structural strength of the first insulating member 32, the dimension d1 of the second sealing component 321 in the thickness direction and the dimension d2 of the first insulating member 32 in the thickness direction should satisfy: d1 / d2≤0.8; at the same time, to ensure the sealing effect between the second sealing component 321 and the second sealing surface 312, the dimension d1 of the second sealing component 321 in the thickness direction and the dimension d2 of the first insulating member 32 in the thickness direction should satisfy: 0.1≤d1 / d2. In other words, to ensure the sealing effect between the second sealing component 321 and the second sealing surface 312 while ensuring the overall structural strength of the first insulating member 32, the dimension d1 of the second sealing component 321 in the thickness direction and the dimension d2 of the first insulating member 32 in the thickness direction should satisfy: 0.1≤d1 / d2≤0.8. Illustratively, d1 / d2 may be 0.1, 0.25, 0.45, 0.7, 0.8, etc.

[0069] According to some embodiments of the present invention, Figure 5As shown, the depth of the second groove 31c is d3, the thickness of the cover body 31 is d4, and they satisfy: 0.1≤d3 / d4≤0.8. Specifically, the second groove 31c is opened on the surface of the cover body 31 in the thickness direction. Similarly, in order to ensure the overall structural strength of the cover body 31, the depth d3 of the second groove 31c and the dimension d4 of the cover body 31 in the thickness direction should satisfy: d3 / d4≤0.8; in order to ensure the sealing effect of the second sealing surface 312 and the second sealing component 321, the depth d3 of the second groove 31c and the dimension d4 of the cover body 31 in the thickness direction should satisfy: 0.1≤d3 / d4. In other words, in order to ensure the overall structural strength of the cover body 31 while ensuring the sealing effect of the second sealing surface 312 and the second sealing component 321, the depth d3 of the second groove 31c and the dimension d4 of the cover body 31 in the thickness direction should satisfy: 0.1≤d3 / d4≤0.8. Illustratively, d3 / d4 may be 0.1, 0.25, 0.45, 0.7, 0.8, etc.

[0070] It can be understood that when the first insulating member 32 cooperates with the cover body 31, the multiple surfaces of the cover body 31 spaced apart in the thickness direction will stop contact one by one with the multiple surfaces of the first insulating member 32 spaced apart in the thickness direction to achieve multiple seals between the first insulating member 32 and the cover body 31. Therefore, the thickness d1 of the second sealing component 321 is generally consistent with the depth d3 of the second groove portion 31c, so that the bottom surface of the first groove portion 31b, that is, the first sealing surface 311, can stop contact with the surface of the first insulating member 32 where the second sealing component 321 protrudes, so that the first insulating member 32 and the cover body 31 can be sealed multiple times.

[0071] According to some embodiments of the present invention, Figure 2 As shown, the cover assembly 30 for the battery cell 1 also includes a second insulating member 34, which is arranged on the other side of the cover body 31 in the thickness direction, and the second insulating member 34 is formed with a second through hole 34a that matches the pole 33. Specifically, the cover body 31 is provided with a first insulating member 32 and a second insulating member 34 on both sides in the thickness direction, respectively, a pole mounting hole 31a is formed on the cover body 31, a first through hole 32a is formed on the first insulating member 32, and a second through hole 34a is formed on the second insulating member 34. The pole 33 is penetrated with the second through hole 34a, the pole mounting hole 31a and the first through hole 32a in sequence, so as to connect the second insulating member 34, the cover body 31 and the first insulating member 32.

[0072] In some embodiments, the second insulating member 34 is made of an insulating material to prevent the second insulating member 34 from conducting electricity when in cooperation with the pole 33 , thereby preventing leakage of the battery cell 1 during use and ensuring the safety of the battery cell 1 .

[0073] According to some embodiments of the present invention, Figure 6 As shown, the pole 33 includes a base portion 331 and a column portion 332, the base portion 331 cooperates with the second insulating member 34; the column portion 332 is arranged on one side of the base portion 331 in the thickness direction and passes through the second insulating member 34, the cover body 31 and the first insulating member 32 in sequence; wherein the cross-sectional area of ​​the base portion 331 is larger than the cross-sectional area of ​​the column portion 332. Specifically, the base portion 331 abuts against the surface of the second insulating member 34 away from the cover body 31, so that the second insulating member 34, the cover body 31 and the first insulating member 32 are connected in series after the column portion 332 is penetrated with the second through hole 34a, the pole mounting hole 31a and the first through hole 32a in sequence.

[0074] According to some embodiments of the present invention, Figure 2 As shown, the cover assembly 30 for the battery cell 1 further includes a seal 35, which is sleeved on the outer periphery of the column portion 332 and located between the first insulating member 32 and the base portion 331. Specifically, after the pole 33 is matched with the second insulating member 34, the cover body 31 and the first insulating member 32 respectively, the gap between the pole 33 and the second insulating member 34, the cover body 31 and the first insulating member 32 is filled by the seal 35.

[0075] In some embodiments, the seal 35 is constructed of a soft and deformable material. The seal 35 is sleeved on the outer periphery of the column portion 332, and is compressed and deformed after the pole 33 is respectively matched with the second insulating member 34, the cover body 31 and the first insulating member 32 to fill the gap between the pole 33 and the second insulating member 34, the cover body 31 and the first insulating member 32.

[0076] In some embodiments, the seal 35 is provided with a through hole 35a, and the column portion 332 is respectively provided with a first through hole 32a, a second through hole 34a, a pole mounting hole 31a and a through hole 35a to connect the first insulating member 32, the second insulating member 34, the cover body 31 and the seal 35.

[0077] According to some embodiments of the present invention, Figure 2 As shown, an anti-dropout block 334 is provided at the end of the pole 33, and a third groove portion 32b suitable for accommodating the anti-dropout block 334 is formed on the top surface of the first insulating member 32. Specifically, the anti-dropout block 334 cooperates with the column portion 332 to fix the end of the column portion 332 away from the base portion 331 relative to the first insulating member 32. At this time, the two ends of the pole 33 in the thickness direction of the cover body 31 are respectively fixed to the second insulating member 34 and the first insulating member 32 by the base portion 331 and the anti-dropout block 334, thereby realizing the connection and cooperation between the pole 33 and the cover body 31, the second insulating member 34 and the first insulating member 32.

[0078] In some embodiments, the anti-dropping block 334 is disposed on a side surface of the first insulating member 32 away from the cover body 31 .

[0079] In some embodiments, a head 333 is also formed at the end of the column portion 332 away from the base portion 331. After the first through hole 32a, the second through hole 34a, the pole mounting hole 31a and the through hole 35a are respectively penetrated through the column portion 332, the head 333 is located on the side of the first insulating member 32 away from the cover body 31, and the anti-slip block 334 is sleeved on the outer periphery of the column portion 332 and cooperates with the head 333 in the thickness direction of the cover body 31 to fix the pole 33 to the first insulating member 32.

[0080] In some embodiments, the anti-dropping block 334 is provided with a fixing hole 334 a , and the anti-dropping block 334 is sleeved on the outer circumference of the column portion 332 through the fixing hole 334 a .

[0081] According to some embodiments of the present invention, Figure 3 As shown, a protruding structure 322 protruding away from the cover plate body 31 is formed on the outer periphery of the first insulating member 32. The protruding structure 322 is arranged around the pole 33 and defines a third groove portion 32b with the surface on one side of the first insulating member 32 in the thickness direction to accommodate the anti-dropping block 334.

[0082] According to some embodiments of the present invention, Figure 3 As shown, a fourth groove portion 34b surrounding the second through hole 34a is formed on the other side of the thickness of the second insulating member 34, and the base portion 331 is received in the fourth groove portion 34b. In some embodiments, a third groove portion 32b is formed on the surface of the first insulating member 32 away from the cover body 31 to accommodate the anti-dropping block 334; a fourth groove portion 34b is formed on the surface of the second insulating member 34 away from the cover body 31 to accommodate the base portion 331.

[0083] According to some embodiments of the present invention, Figure 6 As shown, the pole 33 is constructed in multiple configurations. Here, the multiple poles 33 may include a positive pole and a negative pole. Meanwhile, the large-capacity battery cell 1 may have multiple positive poles and multiple negative poles, which may be selected according to actual needs.

[0084] In some embodiments, a plurality of columnar portions 332 may be disposed on the base portion 331 to form a plurality of positive poles or a plurality of negative poles of the battery cell 1 .

[0085] In some embodiments, a liquid injection hole 31 f is provided on the cover body 31 to inject electrolyte into the battery cell 1 .

[0086] In some embodiments, a thinned area 34 c is provided on the second insulating member 34 to reduce the local structural strength of the second insulating member 34 , so as to facilitate the rupture and pressure relief of the second insulating member 34 when the battery cell 1 has thermal runaway, thereby ensuring the safety of the battery cell 1 .

[0087] The battery cell 1 according to the present utility model is briefly described below.

[0088] like Fig. 9 As shown, the battery cell 1 according to the utility model includes: a shell 10, a pole piece and a cover assembly 30, wherein a housing 10 is defined in the housing 10 to contain the pole piece; the pole piece is contained in the housing 10a; the cover assembly 30 is constructed as the cover assembly 30 described in any one of the above embodiments, and the pole 33 of the cover assembly 30 is electrically connected to the pole piece. Specifically, the pole piece of the battery cell 1 is generally electrically connected to other structures through the pole 33, one end of the pole 33 is located in the housing cavity 10a to be electrically connected to the pole piece, and the other end of the pole 33 extends to the outside of the battery cell 1 through the pole mounting hole 31a on the cover body 31 to be electrically connected to other structures outside the battery cell 1. Since the battery cell 1 according to the utility model is provided with the cover assembly 30 of the above embodiment, the battery cell 1 has good sealing performance and is safer to use.

[0089] In the related art, heat easily accumulates in the center of cylindrical batteries, resulting in high battery temperature rise and poor safety in use.

[0090] According to some embodiments of the present invention, Fig. 9 As shown, the battery cell 1 further includes a through piece 40, which is received in the accommodating cavity 10a and is disposed through the cover plate assembly 30, and a through channel 40a suitable for circulating a heat dissipation medium is formed inside the through piece 40. Specifically, at least part of the pole piece is spaced apart to form a gap for convenient heat dissipation, and further, a through piece 40 is disposed at the gap for heat conduction, and further, a through channel 40a is disposed inside the through piece 40, and the heat dissipation medium is suitable for circulating in the through channel 40a for heat exchange with the pole piece, which can solve the problem of excessive temperature rise in the center of the battery cell 1 and improve the safety of the battery cell 1.

[0091] According to some embodiments of the present invention, Fig.11 As shown, a third through hole 31d is formed on the cover body 31, and the third through hole 31d is welded to the outer periphery of the through piece 40, and a fifth groove portion 31e surrounding the third through hole 31d is formed on the top surface of the cover body 31. Specifically, the third through hole 31d connects the through channel 40a with the outside of the battery cell 1, and the fifth groove portion 31e is provided at the third through hole 31d, so that the through piece 40 can be welded to the cover body 31 through the fifth groove portion 31e, which can reduce the risk of melting of the first insulating member 32 due to high temperature during welding, and at the same time facilitate the heat dissipation medium outside the battery cell 1 to pass into or out of the through channel 40a.

[0092] In some embodiments, the second insulating member 34 is provided with a communication hole 34d connecting the third through hole 31d with the through channel 40a.

[0093] In some embodiments, the first insulating member 32 and / or the second insulating member 34 are made of plastic.

[0094] In some embodiments, the through-piece 40 is made of aluminum.

[0095] According to some embodiments of the present invention, Fig.11 As shown, the depth of the fifth groove 31e is d5, and the thickness of the cover body 31 is d4 and satisfies: 0.1≤d5 / d4≤0.2. Specifically, the fifth groove 31e is provided on the surface of the cover body 31 in the thickness direction. To ensure the overall structural strength of the cover body 31, the depth d5 ​​of the fifth groove 31e and the dimension d4 of the cover body 31 in the thickness direction should satisfy: d5 / d4≤0.2; to prevent the first insulating member 32 from melting due to excessively high temperature during welding of the cover body 31 and the through-piece 40, the depth d5 ​​of the fifth groove 31e and the dimension d4 of the cover body 31 in the thickness direction should satisfy: 0.1≤d5 / d4. That is, in order to ensure the overall structural strength of the cover body 31 while preventing the first insulating member 32 from melting due to excessively high temperature during welding of the cover body 31 and the through member 40, the depth d5 ​​of the fifth groove 31e and the dimension d4 of the cover body 31 in the thickness direction should satisfy: 0.1≤d5 / d4≤0.2. For example, d5 / d4 can be 0.1, 0.15, 0.2, etc.

[0096] To sum up, according to the cover assembly 30 of the utility model, the cover body 31 can be sealed and matched with the first insulating member 32 multiple times in the thickness direction to seal the gap between the pole 33 and the cover body 31, the sealing performance of the battery cell 1 is better, and the inside of the battery cell 1 and the outside of the battery cell 1 can be more effectively separated, thereby preventing the battery cell 1 from leaking to the outside of the battery cell 1, and ensuring the safe use of the battery cell 1.

[0097] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0098] Although embodiments of the present invention have been shown and described above, changes, modifications, substitutions and variations may be made to the embodiments described above.

Claims

1. A cover plate assembly (30) for a battery cell, characterized in that: include: A cover plate body (31), wherein a pole mounting hole (31a) is formed on the cover plate body (31), and the cover plate body (31) is provided with a first sealing surface (311) and a second sealing surface (312) arranged in a stepped manner in a thickness direction; A first insulating member (32), the first insulating member (32) being arranged on an end surface of one side in the thickness direction of the cover plate body (31), the first insulating member (32) being formed with a first through hole (32a) corresponding to the pole mounting hole (31a); A pole (33), wherein the pole (33) passes through the pole mounting hole (31a) and the first through hole (32a), so as to be suitable for fixing the first insulating member (32) on the cover plate body (31), so that the first insulating member (32) is sealedly connected to the first sealing surface (311) and the second sealing surface (312) respectively.

2. The cover plate assembly (30) for a battery cell according to claim 1, characterized in that: The end surface of the cover plate body (31) is formed with a first groove portion (31b) suitable for accommodating the first insulating member (32); the bottom surface of the first groove portion (31b) is configured as the first sealing surface (311); the first sealing surface (311) is provided with a first sealing component; and one side surface of the first sealing component in the thickness direction is configured as the second sealing surface (312); The first insulating member (32) is provided with a second sealing member (321) in surface contact with the first sealing member; in One of the first sealing component and the second sealing component (321) is configured as a groove, and the other of the first sealing component and the second sealing component (321) is configured as a protrusion.

3. The cover plate assembly (30) for a battery cell according to claim 2, characterized in that: The first sealing component is configured as a second groove portion (31c) formed on the bottom surface of the first groove portion (31b), the bottom surface of the second groove portion (31c) forms the second sealing surface (312), and the second sealing component (321) protrudes toward the second groove portion (31c).

4. The cover plate assembly (30) for a battery cell according to claim 3, characterized in that: The thickness of the second sealing component (321) is d1, the thickness of the first insulating component (32) is d2, and the following relationship is satisfied: 0.1≤d1 / d2≤0.

8.

5. The cover plate assembly (30) for a battery cell according to claim 3, characterized in that: The depth of the second groove portion (31c) is d3, the thickness of the cover plate body (31) is d4, and the following condition is satisfied: 0.1≤d3 / d4≤0.

8.

6. The cover plate assembly (30) for a battery cell according to claim 1, characterized in that: Also includes: A second insulating member (34), the second insulating member (34) is arranged on the other side of the cover plate body (31) in the thickness direction, and the second insulating member (34) is formed with a second through hole (34a) matched with the pole (33).

7. The cover plate assembly (30) for a battery cell according to claim 6, characterized in that: The pole (33) comprises: A base portion (331), the base portion (331) being matched with the second insulating member (34); A column portion (332), the column portion (332) being arranged on one side of the base portion (331) in the thickness direction and passing through the second insulating member (34), the cover plate body (31) and the first insulating member (32) in sequence; wherein The cross-sectional area of ​​the base portion (331) is greater than the cross-sectional area of ​​the column portion (332).

8. The cover plate assembly (30) for a battery cell according to claim 7, characterized in that: Also includes: A sealing member (35), wherein the sealing member (35) is sleeved on the outer periphery of the column portion (332) and is located between the first insulating member (32) and the base portion (331).

9. The cover plate assembly (30) for a battery cell according to claim 7, characterized in that: An anti-dropping block (334) is provided at the end of the pole (33), and a third groove (32b) suitable for accommodating the anti-dropping block (334) is formed on the top surface of the first insulating member (32).

10. The cover plate assembly (30) for a battery cell according to claim 9, characterized in that: A protruding structure (322) protruding away from the cover plate body (31) is formed on the outer periphery of the first insulating member (32); the protruding structure (322) is arranged around the pole (33) and defines the third groove (32b) with the surface on one side in the thickness direction of the first insulating member (32).

11. The cover plate assembly (30) for a battery cell according to claim 7, characterized in that: A fourth groove portion (34b) surrounding the second through hole (34a) is formed on the other side of the thickness of the second insulating member (34), and the base portion (331) is accommodated in the fourth groove portion (34b).

12. The cover plate assembly (30) for a battery cell according to claim 7, characterized in that: The pole (33) is constructed in plurality.

13. A battery cell (1), characterized in that: include: A housing (10), wherein a housing cavity (10a) for accommodating a pole piece is defined in the housing (10); A pole piece, the pole piece being accommodated in the accommodating cavity (10a); A cover plate assembly (30), wherein the cover plate assembly (30) is constructed as the cover plate assembly (30) according to any one of claims 1 to 12, and the pole (33) of the cover plate assembly (30) is electrically connected to the pole piece.

14. The battery cell (1) according to claim 13, characterized in that: Also includes: A through piece (40) is received in the accommodating cavity (10a) and is arranged to penetrate the cover plate assembly (30), and a through channel (40a) suitable for circulating a heat dissipation medium is formed inside the through piece (40).

15. The battery cell (1) according to claim 14, characterized in that: A third through hole (31d) is formed on the cover body (31), the third through hole (31d) is welded to the outer periphery of the through piece (40), and a fifth groove (31e) surrounding the third through hole (31d) is formed on the top surface of the cover body (31).

16. The battery cell (1) according to claim 15, characterized in that: The fifth groove portion (31e) has a depth of d5, and the cover plate body (31) has a thickness of d4 and satisfies: 0.1≤d5 / d4≤0.2.

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