Battery

Abstract

The utility model relates to a battery. The battery comprises a conductive shell, a battery cell and a top cover assembly, the battery cell is arranged in a containing cavity of the conductive shell, one of negative tabs of the battery cell is electrically connected with the conductive shell, the top cover assembly comprises a conductive cover plate, a circuit board and a pole, the conductive cover plate is insulated from the inner side wall of the conductive shell and is in sealed connection with the inner side wall of the conductive shell, the conductive cover plate is provided with a groove, and the conductive cover plate is electrically connected with a positive tab of the battery cell; the circuit board comprises a board main body and a first conductive piece, a second conductive piece and a third conductive piece which are arranged on the board main body, the first conductive piece is connected with the pole and the positive electrode end of the protection circuit, the third conductive piece is connected with the positive electrode end of the protection circuit and the side wall of the groove, and the negative electrode section of the protection circuit is connected with the second conductive piece; and the opening end of the conductive shell extends towards the accommodating cavity and is connected with the second conductive piece. The connection between the circuit board and the conductive cover plate of the battery is high in reliability, and the energy density of the battery is high.

Description

Technical Field

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

[0002] With the development of electronic products, batteries are widely used. Some batteries include a metal casing, a battery cell, and a top cover assembly. The metal casing has a cavity inside to house the battery cell, and the top of the metal casing has an opening communicating with the cavity, forming an open end. At least part of the top cover assembly is disposed inside the cavity. The top cover includes a conductive cover plate, a sealing ring, a circuit board, and a positive terminal. The conductive cover plate is electrically connected to the positive terminal of the battery cell. The circuit board is stacked on top of the conductive cover plate, and the circuit board and the conductive cover plate are combined to form an assembly. The sealing ring is fastened to the periphery of the assembly, ensuring tight contact between the circuit board and the conductive cover plate to achieve electrical connection. The assembly is sealed and insulated from the metal casing through the sealing ring. One end of the positive terminal is soldered to the circuit board, and the other end extends through the open end to the outside of the metal casing. The circuit board provides protection for the battery cell and allows for monitoring and management of the battery cell.

[0003] However, the batteries using this technology have the following drawbacks: Since the electrical connection between the circuit board and the conductive cover is achieved by using a sealing ring to clamp them, vibrations during prolonged use can cause the circuit board to loosen, leading to unstable contact impedance and affecting normal battery operation. Furthermore, the overall size of the top cover assembly is relatively large, occupying a significant amount of space within the metal casing, resulting in lower battery energy density. Utility Model Content

[0004] Therefore, it is necessary to provide a battery that addresses the above problems by providing a battery with highly reliable connection between the circuit board and the conductive cover, and a high battery energy density.

[0005] A battery is provided, comprising:

[0006] A conductive housing, wherein an accommodating cavity is provided inside the conductive housing, and at least one end of the conductive housing has an opening communicating with the accommodating cavity, forming an open end;

[0007] The battery cell is disposed in the receiving cavity of the conductive housing, and the negative electrode tab of the battery cell is electrically connected to the conductive housing.

[0008] A top cover assembly is disposed at the open end of the conductive housing. The top cover assembly includes a conductive cover plate, a circuit board, and a terminal post disposed on the circuit board. The conductive cover plate is insulated from and sealed to the inner sidewall of the conductive housing. A groove is provided on the side of the conductive cover plate facing away from the battery cell. The conductive cover plate is electrically connected to the positive electrode tab of the battery cell. The circuit board includes a main body disposed in the groove, a protection circuit disposed on the main body, and a first conductive element, a second conductive element, and a third conductive element disposed on the side of the main body facing away from the bottom of the groove. The first conductive element, the second conductive element, and the third conductive element are distributed at intervals along the interior of the main body towards the outer edge of the main body. The first conductive element is connected to the terminal post and the positive terminal of the protection circuit, respectively. The third conductive element is connected to the positive terminal of the protection circuit and the sidewall of the groove, respectively. The negative terminal of the protection circuit is connected to the second conductive element. The open end of the conductive housing extends toward the accommodating cavity and is connected to the second conductive element.

[0009] In one embodiment, the outer edge of the plate body contacts the sidewall of the groove, and the third conductive element is disposed on the outer edge of the plate body.

[0010] In one embodiment, the sidewall of the groove includes a sidewall body and a stepped structure. The sidewall body is connected between the stepped structure and the bottom of the groove. The stepped structure includes a first step and a second step. The first step is disposed at the groove opening end of the groove, and the second step is connected between the first step and the sidewall body. The plate body abuts against the second step, and the outer edge of the plate body contacts the first step. The first step is connected to the third conductive element.

[0011] In one embodiment, the conductive housing includes a housing body and an edge-sealing structure connected to the housing body. The housing body has the accommodating cavity inside. The edge-sealing structure includes a first connecting segment, a transition segment, and a second connecting segment connected in sequence. The first connecting segment is spaced apart on the side of the plate body facing away from the conductive cover plate. The end of the first connecting segment away from the transition segment is connected to the housing body. The second connecting segment surrounds the opening end. The end of the second connecting segment away from the transition segment extends toward the plate body and is connected to the second conductive element.

[0012] In one embodiment, the first conductive element has a ring-shaped or arc-shaped structure;

[0013] And / or, the second conductive element has a ring-shaped or arc-shaped structure;

[0014] And / or, the third conductive element has a ring-shaped or arc-shaped structure.

[0015] In one embodiment, the pole includes a column and a connecting protrusion connected to one end of the column. The column is used for connecting to external electrical equipment, and the connecting protrusion is disposed around the outer periphery of the column and is connected to the first conductive element.

[0016] In one embodiment, the bottom of the groove is provided with an explosion-proof part, the plate body is provided with through holes spaced apart from the first conductive element, the column is provided with an exhaust channel, and the side wall of the column is provided with an exhaust hole communicating with the outside of the conductive shell. The groove, the through holes, the exhaust channel and the exhaust hole are connected in sequence.

[0017] In one embodiment, the first conductive element is welded to the electrode post;

[0018] And / or, the second conductive element is welded to the conductive housing;

[0019] And / or, the third conductive element is welded to the sidewall of the groove.

[0020] In one embodiment, the conductive cover is connected to the positive electrode tab of the battery cell;

[0021] The conductive housing is connected to the negative electrode tab of the battery cell.

[0022] In one embodiment, the top cover assembly further includes an insulating sealing ring surrounding the outer periphery of the conductive cover plate and abutting against the inner wall of the receiving cavity.

[0023] The aforementioned battery is connected to the conductive housing and conductive cover plate one-to-one via second and third conductive components on the circuit board, respectively. This reduces the risk of loosening between the second conductive component and the conductive housing, and between the third conductive component and the conductive cover plate, due to vibration. This ensures reliable connection between the circuit board and the conductive housing and cover plate, helps stabilize the impedance between them, guarantees battery charging and discharging efficiency, and reduces the risk of battery malfunctions. Positioning the main body of the circuit board inside the groove serves two purposes: firstly, the groove accommodates the main body, improving the compactness between the conductive cover plate and the circuit board, reducing the overall size of the top cover assembly, thereby minimizing the space occupied inside the conductive housing and increasing the battery's energy density; secondly, the conductive cover plate provides protection for the circuit board, reducing the risk of cracking during assembly of the top cover assembly and the conductive housing, and improving battery manufacturing quality. Furthermore, a first conductive component is provided on the main body of the circuit board to facilitate electrical connection between the terminal post and the positive electrode tab of the battery cell. Since the conductive housing is filled with electrolyte, the electrolyte may leak through the gap between the conductive cover and the conductive housing. In this application, the first conductive element, the second conductive element and the third conductive element are arranged on the side of the board body facing away from the bottom of the groove. In the event of a slight leakage of electrolyte, the risk of electrolyte contact with the various conductive elements in the circuit board can be reduced, thereby reducing the risk of electrolyte damaging the circuit board. Attached Figure Description

[0024] Figure 1 This is a perspective view of the battery in some embodiments of this application.

[0025] Figure 2 for Figure 1 A cross-sectional view of the battery.

[0026] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0027] Figure 4 This is a perspective view of the top cover assembly in some embodiments of this application (the insulating sealing ring has been removed from the figure).

[0028] Figure 5 for Figure 4 An exploded view of the top cover assembly.

[0029] Figure 6 for Figure 4 A cross-sectional view of the top cover assembly.

[0030] In the picture:

[0031] 1. Conductive housing; 11. Housing body; 12. Edge-sealing structure; 121. First connecting section; 122. Second connecting section; 123. Transition section; 2. Conductive cover plate; 21. Side wall body; 22. Step structure; 221. First step; 222. Second step; 23. Groove; 3. Circuit board; 31. Board body; 311. Through hole; 32. First conductive component; 33. Second conductive component; 34. Third conductive component; 35. Electronic component; 4. Terminal post; 41. Post; 411. Vent hole; 412. Vent channel; 42. Connecting protrusion; 5. Explosion-proof film; 6. Battery cell; 7. Insulating sealing ring. Detailed Implementation

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] The battery provided in one embodiment of this application can be either a primary battery or a secondary battery (i.e., a rechargeable battery). This application takes a secondary battery as an example to describe the structure of the battery in detail.

[0039] See Figure 1 and Figure 2 , Figure 1 Perspective views of batteries in some embodiments of this application are shown. Figure 2 for Figure 1 A cross-sectional view of the battery. The battery includes a conductive housing 1, a battery cell 6, and a top cover assembly. The conductive housing 1 has an internal cavity, and at least one end of the conductive housing 1 has an opening communicating with the cavity, forming an open end. The battery cell 6 is disposed within the cavity of the conductive housing 1, and the negative electrode tab of the battery cell 6 is electrically connected to the conductive housing 1. In this embodiment, the negative electrode tab of the battery cell 6 is connected to the conductive housing 1. The top cover assembly is disposed at the open end of the conductive housing 1. (See reference...) Figure 3 , Figure 4 , Figure 5 and Figure 6 , Figure 3 for Figure 2 Enlarged view of point A in the middle. Figure 4 Perspective views of the top cover assembly in some embodiments of this application are shown. Figure 5 for Figure 4 An exploded view of the top cover assembly. Figure 6 for Figure 4 A cross-sectional view of the top cover assembly. The top cover assembly includes a conductive cover plate 2, a circuit board 3, and electrode posts 4 disposed on the circuit board 3. The conductive cover plate 2 is insulated from and sealed to the inner wall of the conductive housing 1. A groove 23 is provided on the side of the conductive cover plate 2 facing away from the battery cell 6. The conductive cover plate 2 is electrically connected to the positive electrode tab of the battery cell 6. In this embodiment, the conductive cover plate 2 is connected to the positive electrode tab of the battery cell 6. The circuit board 3 includes a board body 31 disposed in the groove 23, a protection circuit disposed on the board body 31, and a first conductive element 32, a second conductive element 33, and a third conductive element 34, all disposed on the side of the board body 31 facing away from the bottom of the groove 23. The first conductive element 32, the second conductive element 33, and the third conductive element 34 are distributed at intervals along the interior of the plate body 31 towards its outer edge. The first conductive element 32 is connected to the pole 4 and the positive terminal of the protection circuit, respectively. The third conductive element 34 is connected to the positive terminal of the protection circuit and the side wall of the groove 23, respectively. This allows the positive terminal of the protection circuit to be electrically connected to the pole 4 of the top cover assembly and the positive electrode tab of the battery cell 6, thereby achieving electrical connection between the first conductive element 32 and the third conductive element 34 and the positive terminal of the protection circuit. The negative terminal of the protection circuit is connected to the second conductive element 33. The open end of the conductive housing 1 extends towards the accommodating cavity and is connected to the second conductive element 33. The positive electrode tab of the battery cell 6 is electrically connected to the negative terminal of the protection circuit through the second conductive element 33.

[0040] It is understandable that the protection circuit has several electronic components 35 set on the main body 31 to provide protection and monitoring management. Through the circuit board 3, it can provide protection and monitoring management for the battery cell 6, and protect the battery cell 6 from overcharging, over-discharging, overcurrent and short circuit. The monitoring management includes power monitoring and temperature detection. Through the cooperation of various electronic components 35 and battery cell 6, it ensures the safe charging and use of the battery and the stable power supply to external electrical equipment.

[0041] When charging the battery, a 5V voltage is input from terminal 4, and the current passes through the protection circuit on circuit board 3. Under the action of the protection circuit, a voltage of 3.5V-4.2V is output to cell 6. When discharging the battery, the current from cell 6 passes through the protection circuit on circuit board 3, and under the action of the protection circuit, a voltage of 1.5V can be output through terminal 4, thereby realizing overvoltage protection of the battery.

[0042] A second conductive element 33 and a third conductive element 34 are provided on the main body 31. Since the third conductive element is connected to the positive terminal of the protection circuit and the side wall of the groove 23 respectively, and the conductive cover plate 2 is connected to the positive electrode of the battery cell, it not only enables the positive electrode of the battery cell to be electrically connected to the positive terminal of the protection circuit, but also restricts the movement of the conductive cover plate 2 relative to the circuit board 3. The negative terminal of the protection circuit is connected to the second conductive element 33, and the opening end of the conductive housing 1 extends toward the accommodating cavity and is connected to the second conductive element 33. Since the conductive housing 1 is electrically connected to the negative electrode of the battery cell, it not only enables the negative electrode of the battery cell to be electrically connected to the negative terminal of the protection circuit, but also restricts the movement of the circuit board 3 relative to the conductive housing 1. Therefore, in this battery structure, the second conductive element 33 and the third conductive element 34 on the circuit board 3 are connected one-to-one with the conductive housing 1 and the conductive cover plate 2, respectively. This reduces the risk of loosening of the second conductive element 33 and the conductive housing 1, and the third conductive element 34 and the conductive cover plate 2 due to vibration. This ensures a reliable connection between the circuit board 3 and the conductive housing 1 and the conductive cover plate 2, helps stabilize the impedance between the circuit board 3 and the conductive cover plate 2, guarantees the charging and discharging efficiency of the battery, and reduces the risk of battery malfunctions. The main body 31 is placed inside the groove 23. On the one hand, the groove 23 accommodates the main body 31, improving the compactness between the conductive cover plate 2 and the circuit board 3, reducing the overall size of the top cover assembly, thereby reducing the space occupied inside the conductive housing 1 and increasing the energy density of the battery. On the other hand, the conductive cover plate 2 provides protection for the circuit board 3, reducing the risk of the circuit board 3 being cracked during the assembly of the top cover assembly and the conductive housing 1, and improving the manufacturing quality of the battery. Furthermore, the first conductive element 32 is provided on the main body 31 to facilitate the electrical connection of the terminal post 4 to the positive electrode tab of the cell 6. Since the conductive housing 1 is filled with electrolyte, the electrolyte may leak through the gap between the conductive cover plate 2 and the conductive housing 1 during actual use of the battery. In this application, the first conductive element 32, the second conductive element 33 and the third conductive element 34 are arranged on the side of the board body 31 facing away from the bottom of the groove 23. In the event of slight leakage of electrolyte, the risk of electrolyte contact with each conductive element in the circuit board 3 can be reduced, thereby reducing the risk of electrolyte damaging the circuit board 3.

[0043] In practice, the connection between the first conductive component 32 and the pole post 4, the connection between the third conductive component 34 and the side wall of the groove 23, and the connection between the conductive housing 1 and the second conductive component 33 can all be made using conductive adhesive or conductive solder. Both adhesive and conductive solder are conductive materials, so that the two conductive components can be fixed to each other while being electrically conductive.

[0044] It should be noted that the conductive cover 2 can also be connected to the positive electrode tab of the battery cell 6 via a conductive structure, thereby achieving an electrical connection between the conductive cover 2 and the positive electrode tab. Alternatively, the conductive housing 1 can be connected to the negative electrode tab of the battery cell 6 via a conductive structure, thereby achieving an electrical connection between the conductive housing 1 and the negative electrode tab.

[0045] In some embodiments, the first conductive element 32 is welded to the electrode post 4, the second conductive element 33 is welded to the conductive housing 1, and the third conductive element 34 is welded to the sidewall of the groove 23. By welding, the two conductive components are connected together, and the contact resistance between the two conductive components can be controlled to below 0.5mΩ. During welding, either solder welding or laser welding can be selected as needed. It should be noted that in solder welding, the conductive solder is solder; in laser welding, the conductive solder is the molten and connected portion of the two interconnected conductive components.

[0046] To facilitate the connection between the third conductive element 34 and the conductive cover plate 2, the outer edge of the plate body 31 is arranged to contact the side wall of the groove 23, and the third conductive element 34 is arranged on the outer edge of the plate body 31. This design shortens the distance between the conductive cover plate 2 and the third conductive element 34, which is beneficial to the connection between the third conductive element 34 and the conductive cover plate 2.

[0047] See Figure 3 and Figure 5 The sidewall of the groove 23 includes a sidewall body 21 and a stepped structure 22. The sidewall body 21 is connected between the stepped structure 22 and the bottom of the groove 23. The stepped structure 22 includes a first step 221 and a second step 222. The first step 221 is located at the groove opening of the groove 23, and the second step 222 is connected between the first step 221 and the sidewall body 21. The plate body 31 abuts against the second step 222, and the outer edge of the plate body 31 contacts the first step 221. The first step 221 is connected to the third conductive element 34. The stepped structure 22 allows the second step 222 to support the circuit board 3, enabling the circuit board 3 to be placed stably inside the groove 23, facilitating the connection between the first step 221 and the third conductive element 34.

[0048] In some embodiments, see Figure 3 and Figure 6The conductive housing 1 includes a housing body 11 and an edge-sealing structure 12 connected to the housing body 11. The housing body 11 has an internal cavity. The edge-sealing structure 12 includes a first connecting segment 121, a transition segment 123, and a second connecting segment 122 connected sequentially. The first connecting segments 121 are spaced apart on the side of the plate body 31 facing away from the conductive cover plate 2. The end of the first connecting segment 121 away from the transition segment 123 is connected to the housing body 11, and the second connecting segment 122 forms an open end. The end of the second connecting segment 122 away from the transition segment 123 extends towards the plate body 31 and connects to the second conductive element 33. By providing the edge-sealing structure 12 on the housing body, the outer edge of the plate body 31 and the third conductive element 34 can be wrapped inside, making the structure between the conductive housing 1 and the top cover assembly more compact. It also facilitates the extension of the second connecting segment 122 towards the plate body 31, allowing the conductive housing 1 to connect to the third conductive element 34 located between the first conductive element 32 and the third conductive element 34.

[0049] In some embodiments, the conductive cover 2 is electrically connected to the positive tab of the battery cell 6, and the conductive housing 1 is electrically connected to the negative tab of the battery cell 6. In this battery structure, the terminal 4 serves as the positive terminal of the battery, and the conductive housing 1 serves as the negative terminal. In actual use, the conductive housing 1 is connected to the negative terminal of an external electrical device, and the terminal 4 is connected to the positive terminal of the external electrical device. In this example, the conductive cover 2 is formed by stamping aluminum sheet, the sidewall thickness of the conductive cover 2 is 0.3 mm, and the overall height of the conductive cover 2 is 1 mm. In other examples, the conductive cover 2 can also be electrically connected to the negative tab of the battery cell 6, and the conductive housing 1 can be electrically connected to the positive tab of the battery cell 6.

[0050] See Figure 4 , Figure 5 and Figure 6 The electrode post 4 includes a post body 41 and a connecting protrusion 42 connected to one end of the post body 41. The post body 41 is used for connecting to external electrical equipment. The connecting protrusion 42 is arranged around the outer periphery of the post body 41 and is connected to the first conductive element 32. The connection protrusion 42 increases the connection area between the electrode post 4 and the first conductive element 32, making the connection between the electrode post 4 and the first conductive element 32 more secure and further reducing the risk of loosening between the electrode post 4 and the first conductive element 32.

[0051] In one example, the connecting protrusion 42 and the first conductive element 32 are both annular, allowing the shape of the first conductive element 32 to adapt to the shape of the connecting protrusion 42. In practical implementation, the connection between the connecting protrusion 42 and the first conductive element 32 can be annular, which helps to increase the connection area between them and thus improves the connection strength between the first conductive element 32 and the pole post 4. In other examples, the shape of the first conductive element 32 can also be arc-shaped or other shapes; no specific limitation is placed on the shape of the first conductive element 32 here.

[0052] In this example, the conductive housing 1 has a cylindrical structure, therefore, the opening end of the conductive housing 1 is circular. To adapt the second conductive element 33 to the shape of the opening end, the second conductive element 33 has an annular structure. This allows the connection between the opening end of the conductive housing 1 and the second conductive element 33 to be annular, ensuring a sealed connection between the conductive housing 1 and the circuit board 3 and improving the reliability of the connection between the second conductive element 33 and the conductive housing 1. Of course, in other embodiments, the shape of the second conductive element 33 can be set to an arc shape, a rectangle, or an irregular shape, etc., as needed. There is no specific limitation on the shape of the second conductive element 33.

[0053] For example, the third conductive element 34 has an arc-shaped structure. Of course, in other examples, the shape of the third conductive element 34 can also be set as a ring, a rectangle, or an irregular shape, etc., and there is no specific limitation on the shape of the third conductive element 34.

[0054] See Figure 4 , Figure 5 and Figure 6The bottom of the groove 23 is provided with an explosion-proof part. The plate body 31 is provided with through holes 311 that are spaced apart from the first conductive element 32. When the first conductive element 32 is in a ring structure, the through holes 311 are located in the area surrounded by the first conductive element 32. The column 41 is provided with an exhaust channel 412. The side wall of the column 41 is provided with an exhaust hole 411 that communicates with the outside of the conductive shell 1. The groove 23, through holes 311, exhaust channel 412 and exhaust hole 411 are connected in sequence. There is a gap between the circuit board 3 and the bottom of the groove 23. The bottom of the groove 23 is provided with an explosion-proof hole, which is sealed with an explosion-proof membrane 5. The explosion-proof membrane 5 serves as an explosion-proof part. The structure of the explosion-proof membrane 5 is relatively thin (in this example, the thickness of the explosion-proof membrane 5 is 0.015mm). When an abnormality occurs inside the battery, high-pressure gas will be generated inside the conductive shell 1. When the pressure of the high-pressure gas exceeds the set value, it will break through the explosion-proof membrane 5. The high-pressure gas will be discharged from the explosion-proof hole through the through hole 311, the exhaust channel 412 and the exhaust hole 411 to the outside of the battery, thereby preventing the battery from exploding and improving the battery safety. In this example, the through hole 311 is located in the middle of the board body 31. When the first conductive element 32 has a ring structure, the through hole 311 and the exhaust channel 412 are opposite to each other. The through hole 311 is located in the area surrounded by the first conductive element 32. The connecting protrusion 42 is sealed to the first conductive element 32. In this way, the high-pressure gas can all enter the exhaust channel 412 after passing through the through hole 311, which is conducive to the concentrated discharge of the high-pressure gas. Of course, in other examples, the explosion-proof part can also be set as an explosion-proof groove, and there is no limitation on the specific structure of the explosion-proof part.

[0055] In some embodiments, see Figure 3 The top cover assembly also includes an insulating sealing ring 7, which is disposed around the outer periphery of the conductive cover plate 2 and abuts against the inner wall of the conductive housing 1. The presence of the insulating sealing ring 7 facilitates the insulation and sealing connection between the conductive cover plate 2 and the inner wall of the accommodating cavity.

[0056] The insulating sealing ring is a ring structure. The material of the insulating sealing ring can be polyethylene (PE), ABS plastic, PC plastic, polypropylene (PP), polyamide (PA, commonly known as nylon), polytetrafluoroethylene (PTFE) or rubber, etc. The material compression ratio of the insulating sealing ring 7 is 15%-35%.

[0057] When the conductive housing 1 includes the edge-sealing structure 12, the conductive housing 1 also includes a protrusion protruding from the inner sidewall of the housing body 11. The protrusion is spaced apart from the first connecting section 121, and a mounting groove is formed between the protrusion and the first connecting section 121. The insulating sealing ring 7 is pressed against the mounting groove, so that the insulating sealing ring 7 seals with the groove wall of the mounting groove, thereby achieving a seal between the top cover assembly and the conductive housing 1. In this example, the depth of the mounting groove (i.e., the distance from the groove opening to the groove bottom) is 0.5mm-2mm, and the groove bottom refers to the side of the conductive cover plate 2 opposite to the groove opening. In actual implementation, the insulating sealing ring 7, part of the sidewall of the conductive cover plate 2, and part of the third conductive component 34 are all located in the mounting groove.

[0058] In some embodiments, the battery cell 6 is a wound battery cell 6, and the electrochemical materials on the wound battery cell 6 can be selected from lithium cobalt oxide (LiCoO2), lithium manganese oxide (LiMn2O4), lithium iron phosphate (LiFePO4), ternary materials (LiNiXCo). γ Mn 1-X-γ O2), lithium nickel cobalt aluminum oxide (LiNi) 0.8 Co 0.15 Al 0.05 The battery cell 6 can be converted by electronic components 35 (e.g., DC / DC converter) on the circuit board 3, thereby increasing the battery capacity and allowing it to be reused. The cell can also be used repeatedly.

[0059] The following describes the battery assembly process using the welding of the first conductive component 32 to the terminal post 4, the welding of the second conductive component 33 to the conductive housing 1, and the welding of the third conductive component 34 to the side wall of the groove 23 as examples:

[0060] Step S10: Weld the electrode post 4 to the first conductive component 32 so that the electrode post 4 is fixedly connected to the circuit board 3;

[0061] Step S20: Install the circuit board 3 into the groove 23 of the conductive cover plate 2, so that the circuit board 3 is embedded in the conductive cover plate 2, and use solder to fix the third conductive component 34 to the side wall of the conductive cover plate 2.

[0062] Step S30: Install the battery cell 6 into the receiving cavity of the conductive housing 1, weld the negative electrode tab of the battery cell 6 to the conductive housing 1, and weld the positive electrode tab of the battery cell 6 to the side of the conductive cover plate 2 facing the battery cell 6, inject electrolyte into the conductive housing 1, put the insulating sealing ring 7 on the outer periphery of the conductive cover plate 2, seal the insulating sealing ring 7 inside the conductive housing 1, and weld the second conductive component 33 to the conductive housing 1.

[0063] 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.

[0064] The above embodiments merely illustrate 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 by, include: A conductive housing, wherein an accommodating cavity is provided inside the conductive housing, and at least one end of the conductive housing has an opening communicating with the accommodating cavity, forming an open end; The battery cell is disposed in the receiving cavity of the conductive housing, and the negative electrode tab of the battery cell is electrically connected to the conductive housing. A top cover assembly is disposed at the open end of the conductive housing. The top cover assembly includes a conductive cover plate, a circuit board, and a terminal post disposed on the circuit board. The conductive cover plate is insulated from and sealed to the inner sidewall of the conductive housing. A groove is provided on the side of the conductive cover plate facing away from the battery cell. The conductive cover plate is electrically connected to the positive electrode tab of the battery cell. The circuit board includes a main body disposed in the groove, a protection circuit disposed on the main body, and a first conductive element, a second conductive element, and a third conductive element disposed on the side of the main body facing away from the bottom of the groove. The first conductive element, the second conductive element, and the third conductive element are distributed at intervals along the interior of the main body towards the outer edge of the main body. The first conductive element is connected to the terminal post and the positive terminal of the protection circuit, respectively. The third conductive element is connected to the positive terminal of the protection circuit and the sidewall of the groove, respectively. The negative terminal of the protection circuit is connected to the second conductive element. The open end of the conductive housing extends toward the accommodating cavity and is connected to the second conductive element.

2. The battery of claim 1, wherein, The outer edge of the plate body contacts the side wall of the groove, and the third conductive element is disposed on the outer edge of the plate body.

3. The battery of claim 2, wherein, The sidewall of the groove includes a sidewall body and a stepped structure. The sidewall body is connected between the stepped structure and the bottom of the groove. The stepped structure includes a first step and a second step. The first step is disposed at the groove opening end of the groove. The second step is connected between the first step and the sidewall body. The plate body abuts against the second step. The outer edge of the plate body contacts the first step, and the first step is connected to the third conductive element.

4. The battery of claim 1, wherein, The conductive housing includes a housing body and an edge-sealing structure connected to the housing body. The housing body has an internal cavity. The edge-sealing structure includes a first connecting segment, a transition segment, and a second connecting segment connected in sequence. The first connecting segment is spaced apart on the side of the plate body facing away from the conductive cover plate. The end of the first connecting segment away from the transition segment is connected to the housing body. The second connecting segment forms the opening end. The end of the second connecting segment away from the transition segment extends toward the plate body and is connected to the second conductive element.

5. The battery of claim 1, wherein, The first conductive element has a ring-shaped or arc-shaped structure; And / or, the second conductive element has a ring-shaped or arc-shaped structure; And / or, the third conductive element has a ring-shaped or arc-shaped structure.

6. The battery according to any one of claims 1 to 5, characterized in that, The pole includes a column and a connecting protrusion connected to one end of the column. The column is used for connecting to external electrical equipment. The connecting protrusion is arranged around the outer periphery of the column and is connected to the first conductive element.

7. The battery of claim 6, wherein, The bottom of the groove is provided with an explosion-proof part, the plate body is provided with through holes spaced apart from the first conductive element, the column is provided with an exhaust channel, and the side wall of the column is provided with an exhaust hole communicating with the outside of the conductive shell. The groove, the through holes, the exhaust channel and the exhaust hole are connected in sequence.

8. The battery according to any one of claims 1 to 5, characterized in that, The first conductive element is welded to the electrode post; And / or, the second conductive element is welded to the conductive housing; And / or, the third conductive element is welded to the sidewall of the groove.

9. The battery according to any one of claims 1 to 5, characterized in that, The conductive cover plate is connected to the positive electrode tab of the battery cell; The conductive housing is connected to the negative electrode tab of the battery cell.

10. The battery according to any one of claims 1 to 5, characterized in that, The top cover assembly also includes an insulating sealing ring, which is disposed around the outer periphery of the conductive cover plate and abuts against the inner wall of the accommodating cavity.

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