Cover plate structure, lithium battery and electric device

Abstract

The application provides a cover plate structure, a lithium battery and an electric device. The cover plate structure comprises: a pole assembly, the pole assembly is provided with one or more bosses, the line between any point of each boss and the axis of the pole assembly is a first line segment, the included angle between the first line segment and a first straight line in the horizontal plane is 0-45 degrees, and the first straight line intersects with the axis. The light aluminum sheet comprises a mounting hole, and the mounting hole is provided with one or more grooves, and the one or more grooves are suitable for being connected with the one or more bosses. The cover plate structure, the lithium battery and the electric device provided by the application can strengthen the torsion between the pole assembly and the cover plate, and further improve the safety performance of the battery cell.

Description

Technical Field

[0001] This application relates primarily to the field of battery technology, and in particular to a cover plate structure, a lithium battery, and an electrical device. Background Technology

[0002] Aluminum is widely used in power batteries as the casing. However, due to the potential difference between aluminum and the positive terminal of the battery, the aluminum casing is prone to corrosion at the bottom. Directly connecting the aluminum casing to the positive terminal eliminates this potential difference and prevents corrosion. Therefore, the battery top cover typically has two through-holes corresponding to the positive and negative terminals. The positive terminal passes through one through-hole and is electrically connected to the top cover plate, while the negative terminal passes through the other through-hole and is electrically insulated from the top cover plate. A short-circuit component is located near the negative terminal. When the internal pressure of the power battery increases, the short-circuit component moves upward, forming a circuit between the positive and negative terminals and generating a large current in the circuit. This causes the connecting component to melt, thereby cutting off the main circuit.

[0003] The terminals primarily function to conduct current. Typically, the positive terminal uses an aluminum terminal, while the negative terminal uses a copper-aluminum composite terminal. Over time, the battery cover will deform and bulge. Because the cover completely encloses the terminals in a C-shape, but the terminals have no room to deform, the upper plastic layer of the cover structure may crack, creating a risk of leakage. Utility Model Content

[0004] The technical problem to be solved by this application is to provide a cover plate structure, a lithium battery, and an electrical device that can enhance the torque between the terminal assembly and the cover plate, thereby further improving the safety performance of the battery cell.

[0005] To solve the above-mentioned technical problems, this application provides a cover plate structure, including: a pole post assembly, the pole post assembly having one or more bosses, the line connecting any point of each boss to the axis of the pole post assembly being a first line segment, the angle between the projection of the first line segment and the first straight line on the horizontal plane being 0° to 45°; and a light aluminum sheet, the light aluminum sheet including a mounting hole, the mounting hole having one or more grooves, the one or more grooves being adapted to engage with one or more bosses.

[0006] Optionally, the first line of the electrode assembly further includes a positive electrode and a negative electrode.

[0007] Optionally, the mounting holes include a positive mounting hole and a negative mounting hole, wherein the positive mounting hole corresponds to the positive terminal in spatial position, and the negative mounting hole corresponds to the negative terminal in spatial position.

[0008] Optionally, the cover plate structure further includes sealing rings, which include a positive sealing ring and a negative sealing ring. The positive sealing ring is located inside the positive mounting hole, and the negative sealing ring is located inside the negative mounting hole.

[0009] Optionally, the shape of the boss includes a square, a cylinder, and / or a polygon.

[0010] Optionally, the cover plate structure further includes an upper plastic layer, which includes multiple perforated holes. The upper plastic layer includes a positive electrode upper plastic layer and a negative electrode upper plastic layer, with the positive electrode upper plastic layer located above the positive electrode post and the negative electrode upper plastic layer located above the negative electrode post.

[0011] Optionally, the cover structure also includes a lower plastic layer located below the aluminum sheet.

[0012] Optionally, the cover structure also includes an explosion-proof valve and an explosion-proof valve protection plate, wherein the explosion-proof valve is located between the aluminum sheet and the lower plastic sheet, and the explosion-proof valve protection plate is located above the aluminum sheet.

[0013] To address the aforementioned technical problems, this application provides a lithium battery, including the cover structure and cell described above.

[0014] To address the aforementioned technical problems, this application provides an electrical device comprising one or more lithium batteries connected in series as described above.

[0015] Compared with existing technologies, this application, by providing a boss on the terminal assembly and a groove on the mounting hole of the aluminum sheet suitable for engaging with the boss, increases the torque between the terminal assembly and the aluminum sheet, prevents cracking of the upper plastic in the cover structure, reduces the risk of battery leakage, and further improves the safety performance of the cell. Furthermore, this application also limits the distances of the boss on the positive terminal and the negative terminal from the first straight line, thereby preventing mistaken identification of the positive and negative terminals. This makes it easier to distinguish between the positive and negative terminals during battery cover assembly, further improving the flexibility of cover structure installation and ensuring battery performance. Attached Figure Description

[0016] The accompanying drawings are included to provide a further understanding of this application; they are incorporated into and constitute a part of this application. The drawings illustrate embodiments of this application and, together with this specification, serve to explain the principles of this application. In the drawings:

[0017] Figure 1 This is an exploded view of a cover plate structure according to one embodiment of this application;

[0018] Figure 2This is a schematic diagram of the negative electrode post in a cover plate structure according to one embodiment of this application;

[0019] Figure 3 This is a schematic diagram of the positive electrode post in a cover plate structure according to one embodiment of this application;

[0020] Figure 4 This is a schematic diagram of the structure of the aluminum sheet in a cover plate structure according to one embodiment of this application. Detailed Implementation

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of this application. For those skilled in the art, these drawings can be applied to other similar scenarios without creative effort. Unless obvious from the context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.

[0022] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" are not specifically singular and may include plural forms. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0023] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0024] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0025] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0026] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application. In addition, although the terminology used in this application is selected from commonly known and used terms, some terms mentioned in this application's specification may have been chosen by the applicant according to his or her judgment, and their detailed meanings are explained in the relevant sections of this description. Moreover, this application should be understood not only through the actual terms used, but also through the meaning implied by each term.

[0027] This application refers to Figures 1-4 A cover plate structure 10 is proposed, wherein, Figure 1 An exploded view of the cover structure 10 is shown. Figures 2-3 A schematic diagram of the pole post assembly 11 in the cover plate structure 10 is shown. Figure 4 A schematic diagram of the aluminum sheet 13 in the cover plate structure 10 is shown. Specifically, the cover plate structure 10 mainly includes the pole post assembly 11 and the aluminum sheet 13, which will be described below. Figures 2-3 The specific structure of the pole assembly 11 is explained.

[0028] Specifically, the terminal assembly 11 includes a positive terminal 111 and a negative terminal 112, wherein, Figure 2 A schematic diagram of the positive electrode post 111 is shown. Figure 3 A schematic diagram of the negative electrode post 111 is shown. Now refer to... Figure 2 Taking the positive electrode post 111 as an example, let's first explain the specific structure of the positive electrode post 111.

[0029] Specifically, refer to Figure 2 The positive electrode post 111 is provided with multiple protrusions 12. The line connecting each protrusion 12 to the axis O of the electrode post assembly 11 is a first line segment y1. The angle θ1 between the projection of the first line segment y1 and the first straight line X1 onto the horizontal plane is 0° to 45°, for example, 0°, 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, and 45°. For example, in this embodiment, the positive electrode post 111 is symmetrical along the center line X1 of the electrode post in the first direction X, and one end of the first line segment y1 is any point of the protrusion 12. That is, no matter where one end of the first line segment y1 is located on the protrusion 12, the angle between its projection and the first straight line X1 onto the horizontal plane is between 0° and 45°.

[0030] In this preferred embodiment, taking the positive electrode post 111 as an example, the distance between the protrusion 12 of the positive electrode post 111 and the center line X1 of the post is h1. For example, the length ratio of h1 to y1 is 1 / 2.

[0031] Furthermore, refer to Figure 3 The negative electrode post 112 is the same as the positive electrode post 111. The negative electrode post 112 also has multiple protrusions 12. The line connecting each protrusion 12 and the axis O of the electrode post assembly 11 is a second line segment y2. The angle between the second line segment y2 and the first straight line X1 is 0° to 45°, for example, 0°, 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, and 45°. For example, the first straight line X1 intersects the axis O. In this embodiment, the negative electrode post 112 is symmetrical along the center line X1 of the electrode post in the first direction X.

[0032] In this preferred embodiment, taking the negative electrode post 112 as an example, the distance between the protrusion 12 of the negative electrode post 112 and the center line X1 of the post is h2. For example, the length ratio of h2 to y2 is 1 / 2.

[0033] In this preferred embodiment, the first line segment y1 and the second line segment y2 are different. By setting the first line segment y1 and the second line segment y2 to different angles, it is helpful to distinguish the positive terminal 111 and the negative terminal 112. This facilitates the differentiation of the positive terminal 111 and the negative terminal 112 during installation, realizes the foolproof design of the positive terminal 111 and the negative terminal 112, further improves the convenience and reliability of battery installation, and enhances the safety performance of the battery.

[0034] For example, one or more protrusions may be provided on both the positive terminal 111 and the negative terminal 112 as needed. The shape of the protrusions may be square, cylindrical and / or polygonal, and this application does not limit them.

[0035] On the other hand, the cover plate structure 10 also includes a light aluminum sheet 13, as shown in the reference. Figure 4 , Figure 4 The specific structure of the aluminum sheet 13 is shown. The aluminum sheet 13 includes mounting holes 14, including a positive electrode mounting hole 141 and a negative electrode mounting hole 142. The positive electrode mounting hole 141 corresponds to the positive electrode post 111 in spatial position, and the negative electrode mounting hole 142 corresponds to the negative electrode post 112 in spatial position. Both the positive electrode mounting hole 141 and the negative electrode mounting hole 142 are provided with multiple grooves 15, which are suitable for engaging with multiple protrusions 12 on the electrode post assembly 11.

[0036] By setting a groove 15 on the aluminum sheet 13 and a boss 12 on the terminal assembly 11, the torque between the terminal and the aluminum sheet and between the terminals can be improved through the snap-fit ​​cooperation between the two. The greater the torque, the higher the safety of the cell, and the better the performance of the battery.

[0037] Further, refer back to the reference. Figure 1 The cover structure 10 also includes a sealing ring 16, which comprises a positive electrode sealing ring 161 and a negative electrode sealing ring 162. The positive electrode sealing ring 161 is located inside the positive electrode mounting hole 141, and the negative electrode sealing ring 162 is located inside the negative electrode mounting hole 142. The sealing ring 16 improves the sealing performance of the lithium battery, further ensuring its safety and reliability.

[0038] Continue to refer to Figure 1 The cover structure 10 also includes an upper plastic 17, which includes multiple perforated holes 173. The perforated holes 173 prevent the upper plastic 17 from cracking. Furthermore, the upper plastic 17 includes a positive electrode upper plastic 171 and a negative electrode upper plastic 172. The positive electrode upper plastic 171 is located above the positive electrode post 111, and the negative electrode upper plastic 172 is located above the negative electrode post 112. The upper plastic prevents the posts from directly contacting other components of the cover structure 10, effectively preventing battery corrosion and thus improving product quality and lifespan.

[0039] Furthermore, the cover structure 10 also includes a lower plastic 18, which is located below the aluminum sheet 13. On the other hand, the cover structure 10 also includes an explosion-proof valve 19 and an explosion-proof valve protection plate 20, with the explosion-proof valve 19 located between the aluminum sheet 13 and the lower plastic 18, and the explosion-proof valve protection plate 19 located above the aluminum sheet 13.

[0040] This application also provides a lithium battery, including the cover structure proposed in any embodiment of this application, such as the cover structure 10 described above.

[0041] This application also provides an electrical device comprising one or more lithium batteries connected in series as described above.

[0042] This application increases the torque between the terminal assembly and the aluminum sheet by providing a boss on the terminal assembly and a groove on the mounting hole of the aluminum sheet suitable for engaging with the boss. This prevents cracking of the upper plastic in the cover structure, reduces the risk of battery leakage, and further improves the safety performance of the cell. Furthermore, this application also limits the distances of the boss on the positive terminal and the negative terminal from the first straight line, thereby preventing mistaken identification of the positive and negative terminals. This makes it easier to distinguish between the positive and negative terminals during battery cover assembly, further improving the flexibility of cover structure installation and ensuring battery performance.

[0043] The basic concepts have been described above. Obviously, for those skilled in the art, the above disclosure is merely illustrative and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application, and therefore remain within the spirit and scope of the exemplary embodiments of this application.

[0044] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic related to at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0045] Similarly, it should be noted that, in order to simplify the description of the present application and thus aid in the understanding of one or more embodiments, the foregoing description of the embodiments of the present application sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of the present application requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of the single embodiments disclosed above.

[0046] In some embodiments, numbers describing the quantity of components and attributes are used. It should be understood that such numbers used in the description of embodiments are modified in some examples with the terms "approximately," "approximately," or "generally." Unless otherwise stated, "approximately," "approximately," or "generally" indicates that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may be changed depending on the characteristics required by individual embodiments. In some embodiments, numerical parameters should take into account specified significant digits and employ a general method of digit reservation. Although the numerical ranges and parameters used to confirm their breadth of scope in some embodiments of this application are approximate values, in specific embodiments, such values ​​are set as precisely as feasible.

[0047] Although this application has been described with reference to specific embodiments, those skilled in the art should recognize that the above embodiments are only used to illustrate this application, and various equivalent changes or substitutions can be made without departing from the spirit of this application. Therefore, any changes or modifications to the above embodiments within the essential spirit of this application will fall within the scope of the claims of this application.

Claims

1. A cover plate structure, characterized in that, include: The pole assembly has one or more protrusions, and the line connecting any point of each protrusion to the axis of the pole assembly is a first line segment. The angle between the projection of the first line segment and the first straight line on the horizontal plane is 0° to 45°, and the first straight line intersects the axis. A smooth aluminum sheet, the smooth aluminum sheet including a mounting hole, the mounting hole having one or more grooves, the one or more grooves being adapted to engage with one or more bosses.

2. The cover plate structure as described in claim 1, characterized in that, The electrode assembly also includes a positive electrode and a negative electrode.

3. The cover plate structure as described in claim 2, characterized in that, The mounting holes include a positive mounting hole and a negative mounting hole. The positive mounting hole corresponds to the positive terminal in spatial position, and the negative mounting hole corresponds to the negative terminal in spatial position.

4. The cover plate structure as described in claim 3, characterized in that, It also includes sealing rings, which include a positive sealing ring and a negative sealing ring. The positive sealing ring is located inside the positive mounting hole, and the negative sealing ring is located inside the negative mounting hole.

5. The cover plate structure as described in claim 1, characterized in that, The shape of the boss includes square, cylindrical and / or polygonal.

6. The cover plate structure as described in claim 2, characterized in that, It also includes an upper plastic, which includes multiple perforated holes. The upper plastic includes a positive electrode upper plastic and a negative electrode upper plastic, with the positive electrode upper plastic located above the positive electrode post and the negative electrode upper plastic located above the negative electrode post.

7. The cover plate structure as described in claim 1, characterized in that, It also includes a lower plastic sheet, which is located below the aluminum sheet.

8. The cover plate structure as described in claim 7, characterized in that, It also includes an explosion-proof valve and an explosion-proof valve protection plate, wherein the explosion-proof valve is located between the light aluminum sheet and the lower plastic sheet, and the explosion-proof valve protection plate is located above the light aluminum sheet.

9. A lithium battery, characterized in that, Includes the cover plate structure and battery cell as described in any one of claims 1 to 8.

10. An electrical appliance, characterized in that, Includes one or more lithium batteries as described in claim 9 connected in series.

Images