Lower supporting piece of battery top cover assembly and battery

Abstract

The utility model relates to a lower supporting piece of a battery top cover assembly and a battery, the lower supporting piece comprises a main body used for supporting a top cover, the main body is provided with a lengthwise direction and a width direction, the lengthwise direction is defined as the arrangement direction of pole holes, and the width direction is perpendicular to the lengthwise direction; and the at least two shielding parts are convexly arranged on the edge of the main body along the lengthwise direction, and the shielding parts are arranged corresponding to the positions of the tabs. The shielding part plays a role in physical blocking, effectively limits the contact between the tab and the outside and the outward movement space, and directly reduces the possibility of contact between the tab and other parts, thereby reducing the risk of short circuit caused by contact; and the protruding shielding part also increases the contact surface area of the top cover and provides more contact points, so that firmer connection can be formed in the battery assembly process, the structural stability is improved, the adhesive force between the lower supporting piece and the top cover is enhanced, and the insulating property is further improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a lower support member of a battery top cover assembly and a battery. Background Art

[0002] As an indispensable energy supply method for modern electronic devices, battery technology has always been a key point in the R & D and manufacturing processes. In the structure of a battery, the design of the top cover is crucial. It not only relates to the physical protection of the battery but also involves the stability of the electrochemical performance. The battery top cover usually includes a precise plastic structure design, which plays multiple roles in the electrochemical energy storage system.

[0003] The plastic structure provides a necessary insulating layer between the battery cell and the top cover. This insulating layer is made of special materials, such as polyester film (Mylar film), which can effectively prevent direct contact between the battery cell and the battery case, thus avoiding potential short - circuit phenomena. The use of Mylar film is not only due to its excellent insulating performance but also because of its thinness, lightness, and flexibility, which can well conform to the shape of the battery cell, ensuring the compactness and consistency of the entire battery pack. Secondly, the plastic structure provides necessary space for the bending of the tabs. The tabs are key parts connecting the internal and external circuits of the battery, and their correct bending and fixing are crucial for the long - term stable operation of the battery. The design of the plastic structure allows the tabs to be properly bent without damage, and at the same time, it can provide a shunt path for the electrolyte during the liquid injection process to ensure that the electrolyte can evenly penetrate into all parts of the battery cell. In addition, the plastic structure also undertakes the function of temporarily storing the electrolyte. During the charge and discharge process of the battery, the amount of electrolyte will change, and the design of the plastic structure can temporarily store the excess electrolyte to avoid safety problems caused by electrolyte overflow. The design of the exhaust channel is also part of the plastic structure, which allows gas to be safely discharged when the internal pressure of the battery increases, thus protecting the battery from damage caused by internal pressure.

[0004] However, although the combination of the plastic structure and Mylar film provides multiple protections for the battery, the current hot - melt connection method still has some potential risks. Traditional hot - melt points are usually distributed on the left, middle, and right sides of the battery top cover. Although this distribution method is economical and convenient, after the tabs are bent, due to the limited fixing effect of the hot - melt points, the tabs may cross the Mylar film and come into contact with the aluminum shell or the top cover due to external extrusion. This contact not only increases the risk of short - circuit but also may cause corrosion of the electrolyte, affecting the service life and safety of the battery. Summary of the Utility Model

[0005] Based on this, it is necessary to provide a lower support member of a battery top cover assembly and a battery with good protection and stable structure for the above - mentioned technical problems.

[0006] A lower support member of a battery top cover assembly, the lower support member comprising:

[0007] A main body for supporting the top cover, the main body having a longitudinal direction and a width direction, the longitudinal direction being defined as the direction in which the pole hole is arranged, and the width direction being perpendicular to the longitudinal direction;

[0008] At least two shielding portions protruding from the edge of the main body along the longitudinal direction, the shielding portions being arranged corresponding to the positions of the tabs.

[0009] In one embodiment, the shielding portion protrudes in a direction opposite to the top cover, and the protruding height is greater than or equal to the thickness of the stacked and bent tabs.

[0010] In one embodiment, the length of the shielding portion in the longitudinal direction is greater than or equal to the length of the bent tab.

[0011] In one embodiment, it further includes edge strips protruding from the edges of both ends of the main body in the longitudinal direction and extending along the width direction.

[0012] In one embodiment, the ratio of the protruding height of the shielding portion to the protruding height of the edge strip is 0.8 - 1.

[0013] In one embodiment, the shielding portion and the edge strip are arranged at intervals or continuously.

[0014] In one embodiment, the shielding portion has a segmented structure or a continuous structure.

[0015] In one embodiment, the edge of the shielding portion abuts against the inner wall of the top cover or the inner wall of the battery housing.

[0016] In one embodiment, the ratio of the area of the lower support member to the area of the top cover is 90% - 99%.

[0017] A battery, comprising the lower support member of the above-mentioned battery top cover assembly.

[0018] By setting up protruding shielding parts corresponding to the tab positions, a physical blocking effect is achieved. These protruding parts are equivalent to a barrier. They closely adhere to the outside of the tabs, effectively restricting the space for the tabs to contact the outside and move outward, directly reducing the possibility of the tabs contacting other components, thereby reducing the short - circuit risk caused by contact; the protruding shielding parts also increase the surface area of contact with the top cover, which provides more contact points for thermally fusing with the top cover. During the battery assembly process, a more solid connection can be formed, not only improving the structural stability, but also enhancing the adhesion between the lower support part and the top cover, further improving the insulation performance; finally, the shielding part helps to improve the overall mechanical strength of the battery, increasing the rigidity of the plastic structure, making the battery top cover more stable when subjected to external forces, and reducing the possibility of damage or rupture of the insulation layer caused by mechanical stress. Brief Description of the Drawings

[0019] Figure 1 Schematic diagram of the structure of the lower support part according to an embodiment of the present application.

[0020] Figure 2 Side view of the lower support part according to an embodiment of the present application.

[0021] Figure 3 Schematic diagram of the structure of the lower support part according to another embodiment of the present application. Detailed Embodiment

[0022] To make the above - mentioned objects, features, and advantages of the present application more obvious and understandable, the following detailed description of the specific embodiments of the present application will be given in conjunction with the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0023] In the description of the present application, it should be understood that if there appear such terms as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counter - clockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present application.

[0024] In addition, if 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 quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0025] In this application, unless otherwise clearly specified and defined, if terms such as "installed", "connected", "joined", "fixed", etc. appear, these terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0026] In this application, unless otherwise clearly specified and defined, if there is a description such as a first feature being "on" or "under" a second feature, the meaning may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0027] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may also be an intermediate element. If an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an intermediate element at the same time. If so, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0028] Refer to Figures 1-3 , Figures 1-3 which shows a schematic structural diagram of the lower support member in an embodiment of this application. The lower support member provided in an embodiment of this application is used for the top cover assembly of a battery.

[0029] The battery includes a housing (not shown in the figure), a top cover assembly, and an electric core (not shown in the figure). The electric core is accommodated in the housing, and the housing plays a role in better supporting and protecting the electric core. The material of the housing is made of, for example, aluminum or aluminum alloy. The top end of the housing is open, and the top cover assembly is arranged at the open end of the housing and closes the opening. The top cover assembly and the housing form a sealed space, which plays a role in encapsulating the electric core.

[0030] The top cover assembly includes two pole columns and two connecting pieces. One of the two pole columns is a positive pole column, and the other is a negative pole column. One of the two connecting pieces is a positive pole connecting piece, and the other is a negative pole connecting piece. The positive pole of the electric core is connected to the positive pole column through the positive pole connecting piece, and the negative pole of the electric core is connected to the negative pole column through the negative pole connecting piece. The top surface of the pole column is connected to the electrical device, realizing the power supply function of the electric core to the electrical device.

[0031] The top cover assembly further includes a top cover and an explosion-proof film (not shown in the figure). An explosion-proof hole is provided on the top cover, and the explosion-proof film is welded in the explosion-proof hole. During use, when gas is generated inside the housing and the air pressure inside the housing reaches the explosion-proof threshold of the explosion-proof film, the explosion-proof film ruptures, and the gas is discharged from the explosion-proof hole, thereby avoiding the explosion of the housing.

[0032] The top cover assembly further includes a lower support member 10. The lower support member 10 is arranged between the top cover and the electric core. The lower support member 10 is connected to the top cover. The lower support member 10 mainly plays roles such as insulating the electric core, supporting the top cover, and fixing the electric core. Preferably, the lower support member 10 is made of materials such as polyester film (Mylar film), polyimide (PI), flame-retardant PP (polypropylene), and / or PPS (polyphenylene sulfide) prepolymer.

[0033] The lower support member 10 includes a main body 100 and at least two shielding portions 200. The main body 100 is used to support the top cover. The main body 100 has a longitudinal direction X and a width direction Y. The longitudinal direction X is defined as the direction in which the pole column holes are arranged, and the width direction Y is perpendicular to the longitudinal direction X. At least two shielding portions 200 protrude from the edge of the main body 100 along the longitudinal direction X, and the shielding portions 200 are arranged corresponding to the positions of the pole ears.

[0034] By setting the protruding shielding part 200 corresponding to the position of the tab, a physical blocking effect is achieved. These protruding parts are equivalent to a barrier. They are closely attached to the outside of the tab, effectively restricting the space for the tab to contact the outside and move outward, directly reducing the possibility of the tab contacting other components, thereby reducing the short-circuit risk caused by contact; the protruding shielding part 200 also increases the surface area of contact with the top cover, which provides more contact points for heat fusion connection with the top cover. During the battery assembly process, a more firm connection can be formed, not only improving the structural stability, but also enhancing the adhesion between the lower support member 10 and the top cover, further improving the insulation performance; finally, the shielding part 200 helps to improve the overall mechanical strength of the battery, increases the rigidity of the plastic structure, makes the battery top cover more stable when subjected to external forces, and reduces the possibility of damage or rupture of the insulation layer caused by mechanical stress.

[0035] Specifically, the main body 100 has a first side (for example, Figure 2 the upper surface shown in ) and a second side (for example, Figure 2 the lower surface shown in ) that are oppositely arranged along its thickness direction. The first side is used for attaching to the top cover, and the second side faces the battery cell. The main body 100 is provided with a liquid injection channel 102 and a pole hole 101. The liquid injection channel 102 corresponds to a preset liquid injection hole on the top cover. In the illustrated embodiment, the main body 100 is provided with two pole holes 101, namely a positive pole hole 101 and a negative pole hole 101. The positive connector and the negative connector are correspondingly arranged at the positive pole hole 101 and the negative pole hole 101, and the longitudinal direction X is defined as the direction in which the two pole holes 101 are arranged.

[0036] In the middle of the main body 100 and between adjacent pole holes 101, there is also a gas hole, which is used to lead to the explosion-proof sheet of the battery. The gas hole penetrates the main body 100 in the thickness direction, enabling the high-temperature and high-pressure gas generated by the battery cell to flow from the second side of the main body 100 to the first side and lead to the explosion-proof sheet through the gas hole, so that the high-temperature and high-pressure gas is discharged from the explosion-proof sheet. The main body 100 is also provided with a grid part 400 outside the gas hole. The grid part 400 protrudes from the main body 100 and forms a channel communicating with the gas hole. The grid part 400 is used to abut against the battery cell. The grid part 400 can play a role in fixing the battery cell and reducing the influence caused by the movement of the battery cell along the thickness direction of the main body inside the battery.

[0037] The shielding part 200 protrudes in the direction opposite to the top cover. The shielding part 200 protrudes from the second side of the main body 100. The shielding part 200 is arranged corresponding to the position of the tab. After the tab is bent, it is generally located at the pole hole 101 or between the pole hole 101 and the gas hole, then the shielding part 200 is located at the pole hole 101 or between the pole hole 101 and the gas hole.

[0038] In one embodiment, the protruding height H of the shielding portion 200 is greater than or equal to the height of the stacked and bent tab. The length L of the shielding portion 200 in the longitudinal direction X is greater than or equal to the length of the bent tab. The length of the bent tab refers to the overall length of all the cell tabs after connection and bending, and the height of the stacked and bent tab refers to the overall thickness of all the cell tabs after connection and bending. According to the above, the shielding portion 200 can isolate the tab from the external structure in the longitudinal rectangular and thickness directions, further improving the structural safety.

[0039] In one embodiment, an edge strip 300 is further included. The edge strip 300 extends along the width direction Y and protrudes from the edges of the main body 100 at both ends in the longitudinal direction X. The edge strip 300 includes a first strip and a second strip. The first strip and the second strip are respectively arranged at both ends of the plastic main body 100 in the length direction, and both can abut against the area of the cell near the edge, so as to form a gap between the main body 100 and the cell. This gap serves as a liquid chamber. At least one of the first strip and the second strip is provided with a liquid injection channel 102 communicating with the liquid chamber, and the liquid injection channel 102 communicates with the liquid chamber.

[0040] In one embodiment, the shielding portion 200 and the edge strip 300 are arranged at intervals or continuously. When the distance between the tab and the edge strip 300 is relatively far, in order to match the position of the tab, the shielding portion 200 and the edge strip 300 are arranged at intervals, and the position of the shielding portion 300 can be set flexibly. When the stacked length of the tab is relatively long, the shielding portion 200 and the edge strip 300 are connected and arranged continuously. At the same time, the strength of the shielding portion 300 can be increased. The connected shielding portion 200 and edge strip 300 form a continuous protrusion at the edge of the main body 100, which is easy to process and form. It can be understood that the shielding portion 200 is arranged at intervals or continuously with at least one of the first strip and the second strip.

[0041] Furthermore, regardless of whether the shielding portion 200 and the edge strip 300 are arranged at intervals or continuously, the adjacent shielding portions 200 can be connected and arranged.

[0042] In one embodiment, the ratio of the protruding height H of the shielding portion 200 to the protruding height of the edge retaining strip 300 is 0.8 - 1. In one embodiment, the edge of the shielding portion 200 abuts against the inner wall of the top cover or the inner wall of the outer shell of the battery. Preferably, the height of the shielding portion 200 first satisfies the matching with the thickness of the stacked bent tab, and the ratio of the protruding height H of the shielding portion 200 to the protruding height of the edge retaining strip 300 is 1, and the ends of the shielding portion 200 and the edge retaining strip 300 are flush with each other, jointly abutting against the outer shell or the battery cell to play a supporting role. Second preferably, the ratio of the protruding height H of the shielding portion 200 to the protruding height of the edge retaining strip 300 is 0.95 or 0.9, and the ends of the shielding portion 200 and the edge retaining strip 300 are nearly flush. While covering the tabs based on the size, a certain heat dissipation gap can also be reserved.

[0043] In one embodiment, the shielding portion 200 has a segmented structure. Specifically, adjacent shielding portions 200 are spaced apart. Further, the shielding portion 200 and the edge retaining strip 300 can be spaced apart or continuous. Alternatively, the shielding portion 200 has a continuous structure, and the shielding portion 200 and the edge retaining strip 300 can be spaced apart or continuous.

[0044] Specifically, as Figure 1 、 2 shown, when the shielding portion 200 has a segmented structure, there are multiple groups of shielding portions 200, and each group has two. Each group of shielding portions 200 corresponds to a tab group, and the two shielding portions 200 in each group are relatively arranged at the two edges of the main body 100 in the width direction Y, shielding the tabs on both sides respectively. The two ends of the shielding portion 200 are spaced apart from the edge retaining strip 300 and the grid portion 400 respectively.

[0045] Specifically, as Figure 3 shown, when the shielding portion 200 has a continuous structure, the two ends of the shielding portion 200 are respectively connected to the edge retaining strip 300 or the grid portion 400, and extend along the two edges of the main body 100 in the longitudinal direction X and cover nearly the entire edge.

[0046] In one embodiment, the ratio of the area of the lower support member 10 to the area of the top cover is 90%-99%. The area of the lower support member 10 substantially coincides with the area of the top cover, but is slightly smaller than the area of the top cover. When the volume of the battery changes during charging and discharging, the smaller area of the lower plastic can make the stress more evenly distributed between the top cover and the plastic, reducing local stress concentration, thereby reducing the risk of rupture of the top cover or the plastic; it can reduce potential short-circuit paths because plastic generally has better insulation performance than the metal top cover; the reduced contact area between the plastic and the top cover can make the combination of the plastic and the top cover tighter, enhancing the mechanical strength of the overall structure. The smaller plastic area provides more flexibility for the design of the battery top cover and can more easily integrate other functions, such as liquid injection holes, explosion-proof valves, etc.

[0047] This application also provides a battery, including the lower support member 10 of the above-mentioned battery top cover assembly. The battery provided by the embodiments of this application has a lower short-circuit risk and improves the working stability and service life of the battery.

[0048] The embodiments of this application provide an electrical device, including the battery described above, for providing electrical energy. The electrical device can be, but is not limited to, mobile phones, tablets, laptop computers, electric toys, power tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric plane toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0049] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0050] The above-described embodiments merely represent several implementation manners of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of this application, several modifications and improvements can still be made, and these all belong to the protection scope of this application. Therefore, the protection scope of the patent of this application should be subject to the appended claims.

Claims

1. A lower support member of a battery top cover assembly, characterized in that, The lower support member includes: a main body for supporting the top cover, the main body having a longitudinal direction and a width direction, the longitudinal direction being defined as the direction in which the pole hole is arranged, and the width direction being perpendicular to the longitudinal direction; and at least two shielding portions protruding from the edge of the main body along the longitudinal direction, the shielding portions being arranged corresponding to the positions of the pole ears.

2. The lower support member of the battery top cover assembly according to claim 1, characterized in that, The shielding portion protrudes in a direction opposite to the top cover, and the protruding height is greater than or equal to the thickness of the stacked bent pole ears.

3. The lower support member of the battery top cover assembly according to claim 1, characterized in that, The length of the shielding portion in the longitudinal direction is greater than or equal to the length of the bent pole ear.

4. The lower support member of the battery top cover assembly according to claim 1, characterized in that, It further includes an edge strip protruding from the edges of the main body at both ends in the longitudinal direction and extending along the width direction.

5. The lower support member of the battery top cover assembly according to claim 4, characterized in that The ratio of the protruding height of the shielding portion to the protruding height of the edge strip is 0.8-1.

6. The lower support member of the battery top cover assembly according to claim 4, characterized in that, The shielding portion and the edge strip are arranged at intervals or continuously.

7. The lower support member of the battery top cover assembly according to claim 1, characterized in that, The shielding portion has a segmented structure or a continuous structure.

8. The lower support member of the battery top cover assembly according to claim 1, characterized in that The edge of the shielding portion abuts against the inner wall of the top cover or the inner wall of the battery case.

9. The lower support member of the battery top cover assembly according to claim 1, characterized in that, The ratio of the area of the lower support member to the area of the top cover is 90%-99%.

10. A battery, characterized in that, A lower support member of the battery top cover assembly according to any one of claims 1-9.

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