Cover plate assembly and battery

Abstract

The utility model provides a cover plate assembly and a battery. The cover plate assembly comprises a top cover, an insulating part and a limiting part, the insulating part is arranged on the inner side of the top cover so as to at least form insulation between the top cover and the battery cell body; the limiting piece is at least partially arranged on one side, far away from the top cover, of the insulating piece, so that a limiting groove in which at least part of the tab can be embedded is formed between the limiting piece and the insulating piece; and at least one of the top cover and the insulating part is provided with a limiting part. According to the utility model, the limiting piece is arranged on one side, far away from the top cover, of the insulating piece, the limiting groove is used for limiting the tab, and the position of the tab is limited when the battery is assembled and used, so that abnormal contact between the tab and the top cover is avoided, electrochemical corrosion caused by lap joint between the tab and the top cover is avoided, and the safety of the battery is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a cover plate assembly and a battery. Background Technology

[0002] As an important component of the battery, the cover plate assembly not only protects the internal structure of the battery, but also ensures the conduction of charging and discharging current of the cell body, and can also play a role in pressure relief, which has a very important impact on the safety performance of the battery.

[0003] In related technologies, the cover plate assembly consists of a top cover, a lower plastic part, and a terminal post. The tabs extend into the cover plate assembly to form an electrical connection with the terminal post. However, due to the lack of effective limiting measures for the tabs, they are prone to shifting or folding due to vibration during use, which can lead to electrochemical corrosion when the tabs overlap with the top cover, causing the battery to leak. Utility Model Content

[0004] The present invention provides a cover plate assembly and a battery to at least partially solve the above-mentioned technical problems.

[0005] In a first aspect, embodiments of the present invention provide a cover plate assembly, comprising:

[0006] Top cover;

[0007] An insulating element is disposed on the inside of the top cover to form insulation at least between the top cover and the cell body;

[0008] The limiting member is at least partially disposed on the side of the insulating member away from the top cover, so that a limiting groove is formed between the limiting member and the insulating member, into which at least a portion of the electrode tab can be inserted;

[0009] At least one of the top cover and the insulating component is provided with a limiting element.

[0010] Optionally, in some embodiments of this utility model, the cover plate assembly includes:

[0011] At least two limiting members are spaced apart along a first direction so that at least a portion of the electrode tab is located between the two limiting members.

[0012] Optionally, in some embodiments of this utility model, the limiting member includes:

[0013] The first gear part has a first contact surface;

[0014] In the second direction, the first contact surface abuts against the electrode tab so that at least a portion of the electrode tab is sandwiched between the limiting member and the insulating member;

[0015] The second direction is perpendicular to the first direction.

[0016] Optionally, in some embodiments of this utility model, the distance between the first contact surface and the insulating member in the second direction gradually decreases along the opposite directions of the two limiting members.

[0017] Optionally, in some embodiments of this utility model, the limiting member includes:

[0018] The second gear part has a second contact surface;

[0019] In the first direction, the second contact surface abuts against the electrode tab so that at least a portion of the electrode tab is sandwiched between the two second stop portions;

[0020] The second gear position is connected between the first gear position and the insulating component.

[0021] Optionally, in some embodiments of this utility model, the maximum distance between the first contact surface and the insulating member is greater than or equal to the overall thickness of the tab;

[0022] And / or the spacing between the two second contact surfaces is greater than or equal to the maximum width of the tab.

[0023] Optionally, in some embodiments of this utility model, the edge of the insulating member is provided with a boss that protrudes in a direction away from the top cover;

[0024] Wherein, in the first direction, the maximum distance between the outer walls of two adjacent limiting members is less than the maximum distance between two adjacent bosses; and / or

[0025] In the second direction, the maximum distance between the outer wall of the limiting member and the top cover is less than or equal to the maximum distance between the boss and the top cover.

[0026] Optionally, in some embodiments of this utility model, the limiting member and the insulating member are integrally formed.

[0027] Secondly, embodiments of this utility model provide a battery, including the aforementioned cover assembly, cell body, and electrode tabs.

[0028] Optionally, in some embodiments of this utility model, the electrode tab includes:

[0029] It fits the edge and is at least partially embedded into the limiting groove;

[0030] The angle between the mating edge and the cell body ranges from 90° to 120°, and the width of the tab gradually decreases in the direction away from the cell body.

[0031] The beneficial effects of the embodiments of this utility model are as follows:

[0032] In an embodiment of the present utility model, a limiting member is provided on the side of the insulating member away from the top cover. The limiting groove formed by the limiting member and the insulating member is used to limit the tab. When the battery is assembled and used, the position of the tab is restricted, which can avoid abnormal contact between the tab and the top cover, thereby improving the technical problem of avoiding electrochemical corrosion caused by the overlap of the tab and the top cover and enhancing the safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0034] Figure 1 is a partial structural schematic diagram of the battery provided by the embodiment of the present utility model;

[0035] Figure 2 is a structural schematic diagram of the cover plate assembly provided by the first embodiment of the present utility model;

[0036] Figure 3 is a structural schematic diagram of a part of the cover plate assembly provided by the first embodiment of the present utility model;

[0037] Figure 4 is a structural schematic diagram of the limiting member in the cover plate assembly provided by the first embodiment of the present utility model;

[0038] Figure 5 is a structural schematic diagram of a part of the cover plate assembly provided by the second embodiment of the present utility model;

[0039] Figure 6 is a structural schematic diagram of a part of the cover plate assembly provided by the third embodiment of the present utility model;

[0040] Figure 7 is a structural schematic diagram of the tab in the battery provided by the embodiment of the present utility model.

[0041] DESCRIPTION OF THE REFERENCE NUMERALS:

[0042] 10. Battery;

[0043] 11. Core body;

[0044] 12. Tab; 12a. Fitting edge;

[0045] 100. Cover plate assembly;

[0046] 110. Top cover;

[0047] 120. Insulating component; 121. Boss;

[0048] 130, limiting component; 130a, limiting groove;

[0049] 131, First gear position; 131a, First contact surface;

[0050] 132, Second gear position; 132a, Second contact surface;

[0051] X1, first direction; X2, second direction; S, projection plane; L, projection curve. Detailed Implementation

[0052] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model. Furthermore, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model.

[0053] In this invention, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in its actual use or working state, specifically the directions shown in the accompanying drawings; while "inner" and "outer" refer to the outline of the device. Furthermore, in the description of this invention, the term "including" means "including but not limited to". The terms "first," "second," "third," etc., are used merely as illustrative purposes and do not impose numerical requirements or establish a specific order.

[0054] In this invention, "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. A and B can be singular or plural.

[0055] Firstly, referring to Figures 1 to 4 The present invention provides a cover assembly 100 for integration with other parts of a battery 10 as part of the battery 10 to form the battery 10. The cover assembly 100 includes a top cover 110, an insulating member 120, and a limiting member 130.

[0056] The top cover 110 serves as a cover for the battery 10, enclosing structures such as the tabs 12 within the internal space of the casing. The top cover 110, for example, is made of aluminum and forms part of the aluminum casing. Alternatively, the top cover 110 is connected to the aluminum casing of the battery 10 to enclose structures such as the tabs 12 and the cell body 11 within the aluminum casing. An insulating member 120 is disposed on the inner side of the top cover 110 to provide insulation between the top cover 110 and the cell body 11; this member is, for example, made of plastic.

[0057] The limiting member 130 can be used to limit the position of the tab 12 relative to the cover plate, preventing contact with the top cover 110 or the aluminum shell. The limiting member 130 is at least partially disposed on the side of the insulating member 120 away from the top cover 110, so that a limiting groove 130a is formed between the limiting member 130 and the insulating member 120, into which at least a portion of the tab 12 can be inserted, thereby limiting the tab 12 using the limiting groove 130a. Specifically, the limiting member 130 is provided on at least one of the top cover 110 and the insulating member 120. For example, the limiting member 130 is integrally formed with the insulating member 120, that is, the limiting member 130 is also an insulating product, and the limiting member 130 protrudes from the surface of the insulating member 120.

[0058] By adopting the above solution, by setting a limiting member 130 on the side of the insulating member 120 away from the top cover 110, and using the limiting groove 130a to limit the tab 12, the position of the tab 12 is restricted during the assembly and use of the battery 10. This can prevent abnormal contact between the tab 12 and the top cover 110, thereby improving the technical problem of preventing electrochemical corrosion caused by the tab 12 overlapping with the top cover 110 and improving the safety of the battery 10.

[0059] As a specific embodiment, the cover assembly 100 includes at least two limiting members 130. These at least two limiting members 130 are spaced apart along a first direction X1, such that at least a portion of the tab 12 is located between the two limiting members 130. This arrangement of the at least two limiting members 130 prevents or limits the tab 12 from wobbling along the first direction X1. During the assembly and use of the battery 10, this interaction between the tab 12 and the limiting members 130 facilitates the positioning and installation of the tab 12, further reducing the possibility of the tab 12 folding or tilting and coming into contact with the top cover 110, thus causing electrochemical corrosion.

[0060] In one embodiment, the limiting member 130 includes a first stop portion 131. The first stop portion 131 has a first contact surface 131a; in a second direction X2, the first contact surface 131a abuts against the tab 12 so that at least a portion of the tab 12 is sandwiched between the limiting member 130 and the insulating member 120; the second direction X2 is perpendicular to the first direction X1. The first contact surface 131a serves as the groove wall of the limiting groove 130a, and its arrangement restricts the tab 12 from disengaging from the limiting groove 130a along the second direction X2, thereby providing a stable limiting effect on the tab 12 during battery assembly and use.

[0061] In one embodiment, the maximum distance a between the first contact surface 131a and the insulating member 120 is greater than or equal to the overall thickness of the tab 12, so that the tab 12 can be stably placed within the limiting groove 130a.

[0062] For example, the maximum distance a between the first contact surface 131a and the insulating member 120 is equal to the overall thickness of the tab 12. After the tab 12 is placed into the limiting groove 130a, the surface of the tab 12 is in contact with the first contact surface 131a and the surface of the insulating member 120, which prevents the tab 12 from shaking.

[0063] Alternatively, the maximum distance 'a' between the first contact surface 131a and the insulating member 120 is greater than the overall thickness of the tab 12. While using the first contact surface 131a to limit the tab 12, it also allows the tab 12 a certain amount of room to move. During the use of the battery 10, this configuration is advantageous in ensuring the stable operation of the tab 12 when it deforms due to thermal expansion and contraction.

[0064] It is understandable that the overall thickness of the tab 12 mentioned in this article refers to the overall thickness of the tabs 12 after they are stacked, rather than the thickness of a single tab 12. That is, the overall thickness of the tab 12 can be equal to the product of the thickness of a single tab 12 and the number of tabs 12.

[0065] In one embodiment, the distance between the first contact surface 131a and the insulating member 120 in the second direction X2 gradually decreases along the opposite directions of the two limiting members 130. As a specific embodiment, refer to... Figure 6 As shown, the first contact surface 131a intersects the surface of the tab 12 at an angle, for example, and the first contact surfaces 131a of two adjacent limiting members 130 are disposed away from the insulating member 120 in the second direction X2 at their ends that are close to each other. Alternatively, refer to Figure 5As shown, the first contact surface 131a is curved. Considering that in the whole composed of multiple tabs 12, the tabs 12 that are farther away from the insulating member 120 along the second direction X2 are more likely to detach from the limiting groove 130a than the tabs 12 that are closer to the insulating member 120, the above arrangement is beneficial to limiting the tabs 12. When the tabs 12 contact the first contact surface 131a, the first contact surface 131a applies a force to the tabs 12 along the second direction X2 towards the insulating member 120, which is beneficial to make the tabs 12 stably exist in the limiting groove 130a.

[0066] In one embodiment, the minimum distance b between two adjacent first stop portions 131 in the first direction X1 is less than the width of the tab 12, so as to use the first stop portions 131 to prevent the tab 12 from disengaging from the limiting groove 130a in the second direction X2.

[0067] As a specific example, refer to Figure 5 As shown, within the projection plane S defined by the first direction X1 and the second direction X2, the projection of the first contact surface 131a includes, for example, at least one projection curve L, and the shape of the projection curve L satisfies the following formula:

[0068] y = kx 2 +b

[0069] Wherein, y is the height (in mm) of the projection curve L protruding from the surface of the insulating member 120 along the second direction X2, x is the length (in mm) of the projection curve L extending along the first direction X1, k is a scaling factor, the value of which ranges from 2 to 3, and this value can be flexibly selected according to the tilt angle of the tab 12 (the definition of the tilt angle of the tab 12 will be explained in detail later). For example, the larger the tilt angle of the tab 12, the larger the value of k, which means that the projection curve L is steeper; b is a constant parameter, the value of which ranges from 0 to 5, and this value can be flexibly selected according to the tilt angle of the tab 12. For example, the larger the tilt angle of the tab 12, the larger the value of k, which means that the distance between the end of the projection curve L near the insulating member 120 and the surface of the insulating member 120 changes in the second direction X2.

[0070] In one embodiment, the limiting member 130 includes a second stop portion 132. The second stop portion 132 has a second contact surface 132a; in a first direction X1, the second contact surface 132a abuts against the tab 12 so that at least a portion of the tab 12 is sandwiched between the two second stop portions 132. The second contact surface 132a serves as the groove wall of the limiting groove 130a, restricting the wobbling of the tab 12 in the first direction X1. The second stop portion 132 connects between the first stop portion 131 and the insulating member 120. In a specific embodiment, the first stop portion 131 and the second stop portion 132 are integrally formed, and the overall structure formed by the two is L-shaped. The limiting groove 130a is formed in the space enclosed by the first stop portion 131 and the second stop portion 132.

[0071] In one embodiment, the distance c between the two second contact surfaces 132a is greater than or equal to the maximum width of the tab 12. Compared with the interference fit between the second contact surface 132a and the tab 12, the second contact surface 132a can be used to limit the shaking of the tab 12 while preventing the tab 12 from bending and deforming during use.

[0072] In one embodiment, the edge of the insulating member 120 is provided with a boss 121 protruding in a direction away from the top cover 110. When the cover assembly 100 is integrated on the battery 10, the boss 121 of the insulating member 120 can be used to cooperate with components of the battery 10, such as the cell body 11, for auxiliary positioning of these components.

[0073] In some embodiments, refer to Figure 4 As shown, in the first direction X1, the maximum distance d between the outer walls of two adjacent limiting members 130 is less than the maximum distance between two adjacent bosses 121, so that the limiting groove 130a for limiting the tab 12 is located between two adjacent bosses 121, preventing the tab 12 from contacting the bosses 121, thus preventing the position of the tab 12 from interfering with the bosses 121. As a specific example, the distance between two adjacent bosses 121 in the first direction X1 can be, for example, 50 to 55 mm.

[0074] In some embodiments, refer to Figure 3 and Figure 4As shown, in the second direction X2, the maximum distance e between the outer wall of the limiting member 130 and the top cover 110 is less than or equal to the maximum distance f between the boss 121 and the top cover 110. This arrangement ensures that the dimension by which the limiting member 130 protrudes from the insulating member 120 in the second direction X2 does not exceed the height of the boss 121. Therefore, when the boss 121 provides a limit for other components of the battery 10, the limiting member 130 will not interfere with the fit between the other components of the battery 10 and the boss 121, ensuring a stable fit between the components of the battery 10. As a specific example, the height by which the boss 121 protrudes from the surface of the insulating member 120 along the second direction X2 can be, for example, 3 to 5 mm.

[0075] Secondly, embodiments of the present invention provide a battery 10, including the aforementioned cover assembly 100, cell body 11, and electrode tabs 12. This battery 10 possesses the beneficial effects of the aforementioned cover assembly 100, which will not be elaborated upon here.

[0076] In some embodiments, the tab 12 includes a mating edge 12a. The mating edge 12a is at least partially embedded in the limiting groove 130a. Specifically, the mating edge 12a is a side surface of the tab 12, and when the tab 12 is embedded in the limiting groove 130a, the side surface where the mating edge 12a is located is the end face of the tab 12 along the first direction X1.

[0077] Among them, reference Figure 7 As shown, the included angle α between the mating edge 12a and the cell body 11 ranges from 90° to 120°, and the width of the tab 12 gradually decreases in the direction away from the cell body 11. In a specific design, within the projection plane S defined by the first direction X1 and the second direction X2, the projection of the tab 12 can be trapezoidal, and a rounded corner can be provided at the end connected to the cell body 11. The mating edge 12a is the hypotenuse of the trapezoid. By limiting the tilt angle between the mating edge 12a and the cell body 11, as well as the tilt direction of the mating edge 12a, the width of the end of the tab 12 away from the cell body 11 can be smaller, resulting in a larger current-carrying area, reducing the internal resistance of the battery 10, increasing the structural strength at the connection between the tab 12 and the cell body 11, making the tab 12 less prone to tearing and folding. Furthermore, it avoids the creepage distance between the end of the tab 12 away from the cell body 11 and the exposed aluminum area of ​​the cover plate (the cover plate edge is often connected to the aluminum shell; if the tab 12 is exposed at the cover plate edge, it is easy to contact the aluminum shell, thus the cover plate edge is an exposed aluminum area), further reducing the possibility of electrochemical corrosion. The included angle α between the mating edge 12a and the cell body 11 is the tilt angle of the tab 12 mentioned above.

[0078] In one embodiment, the included angle α between the mating edge 12a and the cell body 11 ranges from 90° to 100°.

[0079] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A cover plate assembly (100), comprising: a top cover (110); an insulating member (120) arranged on an inner side of the top cover (110) to form insulation at least between the top cover (110) and a battery cell body (11); characterized in that the cover plate assembly (100) further comprises: a limiting member (130) arranged at least on a side of the insulating member (120) away from the top cover (110) to form a limiting groove (130a) between the limiting member (130) and the insulating member (120) for at least partial embedding of a tab (12); wherein the limiting member (130) is arranged on at least one of the top cover (110) and the insulating member (120).

2. The cover plate assembly (100) according to claim 1, characterized in that The cover plate assembly (100) comprises: at least two limiting members (130) arranged at intervals in a first direction (X1) to allow at least partial positioning of the tab (12) between the two limiting members (130).

3. The cover plate assembly (100) according to claim 2, characterized in that The limiting member (130) comprises: a first blocking portion (131) having a first contact surface (131a); wherein the first contact surface (131a) is arranged to abut against the tab (12) in a second direction (X2) to allow at least partial clamping of the tab (12) between the limiting member (130) and the insulating member (120); the second direction (X2) being perpendicular to the first direction (X1).

4. The cover plate assembly (100) according to claim 3, characterized in that A distance between the first contact surface (131a) and the insulating member (120) in the second direction (X2) gradually decreases in a direction away from the limiting member (130).

5. The cover plate assembly (100) according to claim 3, characterized in that The limiting member (130) comprises: a second blocking portion (132) having a second contact surface (132a); wherein the second contact surface (132a) is arranged to abut against the tab (12) in the first direction (X1) to allow at least partial clamping of the tab (12) between the two second blocking portions (132); the second blocking portion (132) being connected between the first blocking portion (131) and the insulating member (120).

6. The cover plate assembly (100) according to claim 5, characterized in that A maximum distance between the first contact surface (131a) and the insulating member (120) is greater than or equal to an overall thickness of the tab (12); and / or a distance between the two second contact surfaces (132a) is greater than or equal to a maximum width of the tab (12).

7. The cover plate assembly (100) according to any one of claims 1 to 6, characterized in that An edge of the insulating member (120) is provided with a boss (121) protruding in a direction away from the top cover (110); wherein a maximum distance between outer walls of two adjacent limiting members (130) in the first direction (X1) is less than a maximum distance between two adjacent bosses (121); and / or a maximum distance between the outer wall of the limiting member (130) and the top cover (110) in the second direction (X2) is less than or equal to a maximum distance between the boss (121) and the top cover (110).

8. The cover plate assembly (100) according to any one of claims 1 to 6, characterized in that The limiting member (130) is integrally formed with the insulating member (120).

9. A battery (10) characterized by A battery cell body (11) and a tab (12) comprising the cover plate assembly (100) according to any one of claims 1 to 8.

10. The battery (10) according to claim 9, characterized in that The tab (12) comprises: a fitting edge (12a) at least partially embedded into the limiting groove (130a); wherein the included angle between the fitting edge (12a) and the battery body (11) ranges from 90° to 120°, and the width of the tab (12) gradually decreases in the direction away from the battery body (11).

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