A battery

Abstract

The application relates to a battery. The battery comprises a shell, an electric core assembly, a conductive support, a protection plate assembly and a sealing element in the shell; one end of the conductive support is in conductive connection with a positive electrode of the electric core assembly, the other end of the conductive support is provided with a stepped groove; the protection plate assembly is located in the stepped groove, one end of the bottom surface of the protection plate assembly facing the stepped groove is provided with a plurality of first conductive columns, and the plurality of first conductive columns are in abutment with the end surface of the stepped groove; one end of the protection plate assembly away from the stepped groove is provided with a plurality of second conductive columns, and the plurality of second conductive columns are in abutment with the inner wall of the shell. The battery disclosed by the application reduces the contact resistance between the protection plate assembly and the conductive support and the shell, and improves the performance of the battery.

Description

Technical Field

[0001] This application relates to the field of lithium battery technology, and in particular to a battery. Background Technology

[0002] Currently, cylindrical lithium batteries typically use a surface-to-surface mounting method between the casing and the conductive support and protection board assembly. This means that electrical connection is achieved through direct contact between two planes. The conductive support and casing are generally made of aluminum. The protection board assembly is susceptible to oxidation of the conductive support and casing surfaces, as aluminum oxidation forms a thin aluminum oxide film. Aluminum oxide itself is an insulator, which significantly increases the contact resistance between the protection board assembly and the conductive support and casing, affecting battery performance. Utility Model Content

[0003] Therefore, it is necessary to provide a battery that reduces the contact resistance between the protection board assembly and the conductive support and casing, thereby improving battery performance.

[0004] A battery includes a housing, and a cell assembly, a conductive support, a protection plate assembly, and a seal located within the housing;

[0005] One end of the conductive bracket is connected to the positive electrode of the battery cell assembly, and the other end of the conductive bracket is provided with a stepped groove;

[0006] The protective plate assembly is located within the stepped groove. At one end of the protective plate assembly facing the bottom surface of the stepped groove, a plurality of first conductive posts are provided, and the plurality of first conductive posts abut against the end face of the stepped groove. At the other end of the protective plate assembly away from the stepped groove, a plurality of second conductive posts are provided, and the plurality of second conductive posts abut against the inner wall of the outer shell.

[0007] In one embodiment, a sealing element is further included, the sealing element being sleeved outside the conductive support, the outer circumferential wall of the sealing element abutting against the inner wall of the housing, and the inner circumferential wall of the sealing element abutting against the outer circumferential wall of the protective plate assembly.

[0008] In one embodiment, the conductive support includes a first connecting portion and a second connecting portion disposed axially away from the cell assembly, wherein the radial dimension of the second connecting portion is greater than the radial dimension of the first connecting portion;

[0009] The sealing element includes a sealing body that matches the shape of the conductive support. The sealing body has an annular protrusion at one end away from the cell assembly. One end of the annular protrusion abuts against the end wall of the protection plate assembly away from the first conductive post, and the other end face of the annular protrusion abuts against the inner wall of the outer casing.

[0010] In one embodiment, the conductive support has an annular sealing groove at one end facing the annular protrusion, and the annular protrusion has a sealing boss corresponding to the annular sealing groove.

[0011] In one embodiment, the conductive support has a sealing slope on one end sidewall near the annular sealing groove, and the sealing slope is inclined to the end face of the conductive support away from the cell assembly.

[0012] In one embodiment, the conductive support has an explosion-proof groove on one end wall facing the battery cell assembly.

[0013] In one embodiment, the protection board assembly includes a circuit board and a protection board body spaced apart. The protection board body is connected to the positive terminal of the battery cell assembly, and the protection board body is positioned closer to the battery cell assembly than the circuit board. A plurality of first conductive posts are disposed at one end of the circuit board near the protection board body, and a plurality of second conductive posts are disposed at one end of the circuit board away from the protection board body.

[0014] In one embodiment, the circuit board includes a positive electrode plate, a substrate, and a negative electrode plate arranged at intervals. The positive electrode plate and the negative electrode plate are electrically connected through the protective plate body. A plurality of first conductive posts are disposed on the negative electrode plate, and a plurality of second conductive posts are disposed on the positive electrode plate.

[0015] In one embodiment, the protection board assembly further includes a positive terminal, one end of which penetrates the circuit board and extends into the housing to connect with the protection board body.

[0016] In one embodiment, a plurality of the first conductive pillars and a plurality of the second conductive pillars are evenly distributed in a ring.

[0017] In the aforementioned battery, one end of the conductive support is connected to the positive terminal of the cell assembly, while the other end of the conductive support has a stepped groove. The protection board assembly is located within the stepped groove, facilitating quick positioning during installation. The end of the protection board assembly facing the bottom of the stepped groove has multiple first conductive posts that abut against the end face of the stepped groove. The end of the protection board assembly away from the stepped groove has multiple second conductive posts that abut against the inner wall of the outer casing. During battery encapsulation, portions of the first conductive posts are pressed into the conductive support, and portions of the second conductive posts are pressed into the outer casing, reducing the contact resistance between the protection board assembly, the conductive support, and the outer casing. This prevents the protection board assembly from directly contacting the oxide layer, thus improving battery performance. Attached Figure Description

[0018] Figure 1 This is an exploded view of the battery components in one embodiment.

[0019] Figure 2 This is a cross-sectional view of a battery in one embodiment.

[0020] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle.

[0021] Figure 4 for Figure 2 A magnified view of a section at point B in the middle.

[0022] Figure 5 This is an exploded view of another component of the battery in one embodiment.

[0023] Figure 6 This is a cross-sectional view of the positive electrode of a battery in one embodiment.

[0024] The attached figures are labeled as follows:

[0025] 1. Outer casing; 2. Cell assembly; 21. Core; 22. Positive tab; 23. Negative tab; 3. Conductive support; 31. Stepped groove; 311. Annular plane; 32. Annular sealing groove; 33. Explosion-proof groove; 34. Sealing slope; 4. Protection board assembly; 41. Circuit board; 411. Substrate; 412. Positive electrode sheet; 413. Negative electrode sheet; 42. Protection board body; 43. Positive post; 5. Seal; 51. Sealing body; 52. Annular protrusion; 521. Sealing boss; 501. First sealing surface; 502. Second sealing surface; 503. Third sealing surface; 6. First conductive post; 7. Second conductive post. Detailed Implementation

[0026] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0027] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and 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 of this application.

[0028] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0032] See Figure 1This application provides an embodiment of a battery, including a casing 1, and a cell assembly 2, a conductive support 3, a protection plate assembly 4, and a sealing element 5 located within the casing 1. The casing 1 serves as a mounting carrier, and is electrically connected to the negative terminal of the cell assembly 2. One end of the conductive support 3 is electrically connected to the positive terminal of the cell assembly 2. To facilitate the positioning of the protection plate assembly 4 during installation and improve the installation positioning accuracy, the other end of the conductive support 3 is provided with a stepped groove 31. The protection plate assembly 4 is located within the stepped groove 31. To reduce the contact resistance between the protection plate assembly 4, the conductive support 3, and the casing 1, a plurality of first conductive posts 6 are provided at one end of the protection plate assembly 4 facing the bottom surface of the stepped groove 31, and the plurality of first conductive posts 6 abut against the end face of the stepped groove 31. A plurality of second conductive posts 7 are provided at the end of the protection plate assembly 4 away from the stepped groove 31, and the plurality of second conductive posts 7 abut against the inner wall of the casing 1.

[0033] It should be noted that when packaging the battery, such as Figure 2 , Figure 3 As shown, a portion of the first conductive post 6 is pressed into the conductive support 3, and a portion of the second conductive post 7 is pressed into the outer casing 1, reducing the risk of a loose connection between the outer casing 1 and the support and the protection board assembly 4, thus reducing production costs. Simultaneously, it reduces the contact resistance between the protection board assembly 4 and the conductive support 3 and the outer casing 1, preventing the protection board assembly 4 from directly contacting the oxide layer and improving battery safety performance. It should be noted that in this application, the end face of the stepped groove 31 refers to the annular plane 311 at the junction of the inner walls of the two steps of the stepped groove 31. Furthermore, to ensure stable support of the first conductive post 6 and the second conductive post 7 by the conductive support 3 during battery encapsulation, and to prevent damage to the protection board assembly 4 due to excessive force during battery encapsulation, the projections of the first conductive post 6 and the second conductive post 7 on the horizontal plane are both within the coverage area of ​​the annular plane 311.

[0034] In this application, the sealing element 5 is sleeved outside the conductive bracket 3, with its outer circumferential wall abutting against the inner wall of the outer casing 1, and its inner circumferential wall abutting against the outer circumferential wall of the protective plate assembly 4. The sealing element 5 is used to isolate the battery cell assembly 2 from the external environment, prevent the electrolyte inside the outer casing 1 from overflowing, and prevent the protective plate assembly 4 from contacting the electrolyte and corroding.

[0035] In some embodiments, to improve the sealing effect of the seal 5, the contact area between the seal 5 and the housing 1 and the conductive support 3 is increased to form a multi-layer seal. For example... Figure 3As shown, the conductive support 3 includes a first connecting portion and a second connecting portion arranged axially away from the cell assembly 2, wherein the radial dimension of the second connecting portion is larger than the radial dimension of the first connecting portion. The sealing element 5 includes a sealing body 51 that matches the shape of the conductive support 3. The sealing body 51 has an annular protrusion 52 at one end away from the cell assembly 2. One end of the annular protrusion 52 abuts against the end wall of the protection plate assembly 4 away from the first conductive post 6, and the other end face of the annular protrusion 52 abuts against the inner wall of the outer casing 1. In this embodiment, the annular protrusion 52 extends radially along the axis close to the outer casing 1 to cover the circumferential stepped sidewall of the conductive support 3 and the end wall away from the cell assembly 2, greatly increasing the sealing contact area between the conductive support 3 and the sealing element 5. The shape of the part of the top inner wall of the outer casing 1 that abuts against the circumferential outer wall of the sealing element 5 matches the shape of the sealing element 5, thereby isolating the electrolyte from the protection plate assembly 4. The top of the outer casing 1 has a flange structure, which is used to press the annular protrusion 52 and the protection plate assembly 4, improving the stability of the overall battery structure.

[0036] In some embodiments, such as Figure 4 As shown, the annular protrusion 52 and the end face of the conductive bracket 3 form a surface-to-surface contact seal. This surface-to-surface seal relies on the tight fit between two planes, requiring extremely high flatness, parallelism, and roughness of the contact surfaces. Even minor errors during processing can lead to poor local contact and seal failure. To further improve the sealing reliability between the seal 5 and the protective plate assembly 4, the conductive bracket 3 has an annular sealing groove 32 at one end facing the annular protrusion 52, and a sealing boss 521 corresponding to the annular sealing groove 32 is provided on the annular protrusion 52. The cross-sectional shape of the annular sealing groove 32 extending axially is V-shaped, arc-shaped, or U-shaped, and the shape of the sealing boss 521 corresponds to it, allowing for adaptive adjustments based on actual processing difficulty.

[0037] It should be noted that in this application, the sealing element 5 is often supported by flexible materials such as silicone rubber and fluororubber. During the battery encapsulation process, the flange structure at the top of the outer casing 1 will squeeze the annular protrusion 52 to seal the annular protrusion 52 against the end of the conductive support 3 away from the cell assembly 2. In order to increase the sealing contact area between the annular protrusion 52 and the conductive support, the side wall of the conductive support 3 near the annular sealing groove 32 is provided with two sealing slopes 34. The sealing slopes 34 are inclined to the end face of the conductive support 3 away from the cell assembly 2. Figure 3As shown in this application, the sealing member 5 is provided with a first sealing surface 501 and a second sealing surface 502 at intervals along the axial direction of the outer shell 1 for contact and sealing with the inner wall of the outer shell 1. The sealing member 5 is provided with a third sealing surface 503 along the axial direction of the outer shell 1 for contact and sealing with the circumferential outer wall of the conductive bracket 3. At the same time, the sealing member 5 contacts and seals with the bottom surface of the annular sealing groove 32 of the conductive bracket 3 and the two sealing inclined surfaces 34 for contact and sealing with the conductive bracket 3. Multiple seals are formed between the sealing member 5 and the outer shell 1 and the conductive bracket 3 to prevent the electrolyte in the outer shell 1 from overflowing and to prevent the protective plate assembly 4 from contacting the electrolyte and causing corrosion.

[0038] In some embodiments, to further enhance battery safety performance, such as Figure 3 As shown, the conductive support 3 has an explosion-proof groove 33 on one end wall facing the cell assembly 2. The explosion-proof groove 33 serves as a directional pressure relief channel. When the pressure inside the battery increases suddenly due to overcharging, short circuit, or thermal runaway, a controllable gas or liquid ejection path is preferentially formed at the explosion-proof groove 33 at the bottom of the conductive support 3, thus preventing the entire cell from rupturing or exploding.

[0039] In some embodiments, to simplify the overall structure of the protection board assembly 4 and reduce the cost of the battery, such as Figure 5 As shown, the protection board assembly 4 includes a circuit board 41 and a protection board body 42 spaced apart. The protection board body 42 is electrically connected to the positive terminal of the battery cell assembly 2 and the positive and negative terminals of the circuit board 41. The protection board body 42 is positioned closer to the battery cell assembly 2 than the circuit board 41. Multiple first conductive posts 6 are located at the end of the circuit board 41 closest to the protection board body 42, and multiple second conductive posts 7 are located at the end of the circuit board 41 furthest from the protection board body 42. Specifically, as... Figure 5 , Figure 6 As shown, the circuit board 41 includes a positive electrode 412, a substrate 411 and a negative electrode 413 arranged at intervals. The positive electrode 412 and the negative electrode 413 are connected by a protective plate body 42. A plurality of first conductive posts 6 are disposed on the negative electrode 413 and a plurality of second conductive posts 7 are disposed on the positive electrode 412.

[0040] Furthermore, to enable conduction between the battery and the external circuit, the protection board assembly 4 also includes a positive terminal post 43, one end of which penetrates the circuit board 41 and extends into the housing 1 to connect with the protection board body 42. In some embodiments, the cell assembly 2 includes a core 21, a positive tab 22, and a negative tab 23, wherein the positive tab 22 is located at the end of the core 21 near the protection board assembly 4 and is in communication with the protection board assembly 4, the negative tab 23 is located at the end of the core 21 away from the protection board assembly 4, the negative tab 23 is in communication with the housing 1, and the core 21 is immersed in the electrolyte.

[0041] In some embodiments, in order to facilitate the reasonable arrangement of the first conductive post 6 and the second conductive post 7 so that the heat is uniformly distributed after the protective plate assembly 4 is electrically connected to the conductive support 3 and the outer shell 1, and to avoid local overheating, the multiple first conductive posts 6 and the multiple second conductive posts 7 are evenly distributed in a ring, which can be adaptively adjusted according to the shape of the conductive support 3 and the protective plate assembly 4.

[0042] Furthermore, due to the small gap between the protective plate body 42 and the conductive bracket 3 and the outer shell 1, the length of the first conductive post 6 is between 0.2mm and 0.3mm. This prevents the first conductive post 6 from lifting the entire protective plate body 42, thus preventing deformation or displacement of the protective plate body 42 and affecting the installation accuracy between the protective plate body 42, the conductive bracket 3, and the seal 5. The length of the second conductive post 7 is between 2mm and 3mm. This prevents the second conductive post 7 from lifting the flange structure of the outer shell 1, thus preventing deformation of the flange of the outer shell 1. Furthermore, to facilitate conductivity between the first conductive post 6 and the conductive bracket 3, the diameter of the first conductive post 6 is between 0.4mm and 0.5mm, ensuring sufficient contact area for conductivity between the first conductive post 6 and the conductive bracket 3. Similarly, the diameter of the second conductive post 7 is between 0.4mm and 0.5mm, ensuring sufficient contact area for conductivity between the second conductive post 7 and the outer shell 1. Furthermore, to facilitate the insertion of the end portion of the first conductive post 6 into the conductive support 3, the end portion of the first conductive post 6 is shaped like a frustum, wider at the top and narrower at the bottom. Similarly, to facilitate the insertion of the end portion of the second conductive post 7 into the conductive support 3, the end portion of the second conductive post 7 is shaped like a frustum, narrower at the top and wider at the bottom.

[0043] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery, characterized in that, Includes a housing, and a cell assembly, conductive support, protective plate assembly, and seals located within the housing; One end of the conductive bracket is connected to the positive electrode of the battery cell assembly, and the other end of the conductive bracket is provided with a stepped groove; The protective plate assembly is located within the stepped groove. At one end of the protective plate assembly facing the bottom surface of the stepped groove, a plurality of first conductive posts are provided, and the plurality of first conductive posts abut against the end face of the stepped groove. At the other end of the protective plate assembly away from the stepped groove, a plurality of second conductive posts are provided, and the plurality of second conductive posts abut against the inner wall of the outer shell.

2. The battery according to claim 1, characterized in that, It also includes a sealing element, which is sleeved outside the conductive bracket, with the outer circumferential wall of the sealing element abutting against the inner wall of the housing, and the inner circumferential wall of the sealing element abutting against the outer circumferential wall of the protective plate assembly.

3. The battery according to claim 2, characterized in that, The conductive support includes a first connecting portion and a second connecting portion disposed axially away from the cell assembly, wherein the radial dimension of the second connecting portion is greater than the radial dimension of the first connecting portion; The sealing element includes a sealing body that matches the shape of the conductive support. The sealing body has an annular protrusion at one end away from the cell assembly. One end of the annular protrusion abuts against the end wall of the protection plate assembly away from the first conductive post, and the other end face of the annular protrusion abuts against the inner wall of the outer casing.

4. The battery according to claim 3, characterized in that, The conductive bracket has an annular sealing groove at one end facing the annular protrusion, and the annular protrusion has a sealing boss corresponding to the annular sealing groove.

5. The battery according to claim 4, characterized in that: The conductive bracket has a sealing slope on one end of its sidewall near the annular sealing groove. The sealing slope is inclined to the end face of the conductive bracket that is away from the battery cell assembly.

6. The battery according to claim 1, characterized in that: An explosion-proof groove is provided on one end wall of the conductive support facing the battery cell assembly.

7. The battery according to claim 1, characterized in that: The protection board assembly includes a circuit board and a protection board body spaced apart. The protection board body is connected to the positive terminal of the battery cell assembly. The protection board body is positioned closer to the battery cell assembly than the circuit board. A plurality of first conductive posts are located at one end of the circuit board near the protection board body, and a plurality of second conductive posts are located at one end of the circuit board away from the protection board body.

8. The battery according to claim 7, characterized in that: The circuit board includes a positive electrode plate, a substrate, and a negative electrode plate arranged at intervals. The positive electrode plate and the negative electrode plate are connected by the protective plate body. A plurality of first conductive posts are disposed on the negative electrode plate, and a plurality of second conductive posts are disposed on the positive electrode plate.

9. The battery according to claim 7, characterized in that: The protection board assembly also includes a positive terminal, one end of which penetrates the circuit board and extends into the housing to connect with the main body of the protection board.

10. The battery according to claim 1, characterized in that: The plurality of first conductive pillars and the plurality of second conductive pillars are evenly distributed in a ring.

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