Battery current collector disc and battery

Abstract

Battery current collector disk comprising a tab connection section (1) electrically connected to a tab of a battery, wherein the tab connection section (1) has an annular structure; a pole connection section (2) electrically connected to a pole (30) of the battery, wherein the pole connection section (2) is arranged in a center of the tab connection section (1), and wherein a circular gap is formed between a circumferential edge of the pole connection section (2) and an inner circumferential edge of the tab connection section (1); a locking device (3) whose two ends are each connected to the circumferential edge of the pole connection section (2) and the inner circumferential edge of the tab connection section (1), respectively.

Description

AREA OF THE UTILITY MODEL The present application relates to the technical field of batteries, in particular to a battery current collector disc and a battery. STATE OF THE ART The casing of the cylindrical lithium-ion battery is provided with a rolling core, and the positive terminal is connected to the positive tab of the rolling core through the positive current collector disc, and / or the negative terminal is connected to the negative tab of the rolling core through the negative current collector disc, so that the positive terminal is positively charged and the negative terminal is negatively charged. DISCLOSURE OF THE UTILITY MODEL Technical problem At present, the current collector disc of the battery has a one-piece sheet structure, when the battery is short-circuited, the internal structural parts of the battery will be highly heated under high current conditions for a long time, and the internal air pressure of the battery will increase at high temperature, which will eventually lead to the explosion of the battery or the opening of the explosion-proof valve. Therefore, a battery current collector disc and a battery are urgently needed to solve the above technical problems. Technical solution The objective of the present application is to propose a battery current collector disc and a battery used to avoid the phenomenon of the battery exploding due to a short circuit or the explosion-proof valve opening. According to the present application, the problem is solved by the following configuration: According to a first aspect, an embodiment of the present application provides a battery current collector disk comprising: a tab connecting portion electrically connected to a tab of a battery, the tab connecting portion being annular; a terminal connecting portion electrically connected to a terminal of the battery, the terminal connecting portion being disposed at the center of the tab connecting portion, and a circular gap being formed between a peripheral edge of the terminal connecting portion and an inner peripheral edge of the tab connecting portion; a fuse having both ends connected to the peripheral edge of the terminal connecting portion and the inner peripheral edge of the tab connecting portion, respectively. According to a second aspect, an embodiment of the present application further provides a battery. It comprises a housing, a rolling core, and a terminal, and further comprises a battery current collector disc. The battery current collector disc is disposed in the housing and is located between the rolling core and the terminal. The tab connecting portion of the battery current collector disc is electrically connected to the tab of the rolling core, and the terminal connecting portion of the battery current collector disc is electrically connected to the terminal. Beneficial effects: The battery current collector plate provided in this application electrically connects the tab connection portion of the battery collecting plate to the tab of the battery during use, and the terminal connection portion of the battery collecting plate is electrically connected to the terminal of the battery. Since the terminal connection portion and the tab connection portion form an electrical connection through the fuse, the terminal is charged when the battery is short-circuited, the internal temperature of the battery rises, the fuse is blown, and the electrical connection between the terminal connection portion and the tab connection portion is cut off, thus preventing the phenomenon of the battery exploding due to a short circuit or the explosion-proof valve being opened. Thus, the safety of the battery is ensured. The battery provided in the present application includes a casing, a rolling core, a terminal, and the above-mentioned battery current collector disk. The battery current collector disk is arranged in the casing and is located between the rolling core and the terminal. The tab connecting portion of the battery current collector disk is electrically connected to the tab of the core. The terminal connecting portion of the battery current collector disk is electrically connected to the terminal. Since the terminal connecting portion and the tab connecting portion of the battery collecting plate form an electrical connection through a fuse, when the battery is short-circuited, the internal temperature of the battery rises, and the fuse is blown, the terminal is energized. This avoids the explosion of the battery due to a short circuit or the phenomenon of the explosion-proof valve opening, so as to ensure the safety of the battery. DESCRIPTION OF THE CHARACTERS Fig. 1 is a partial sectional view of the battery provided in the embodiment of the present application; Fig. 2 is a schematic diagram of the structure of the battery current collector disk provided in the embodiment of the present application; Fig. 3 is the rear view of the battery current collector disk provided in the embodiment of the present application; Fig. 4 is the front view of the battery current collector disk provided in the embodiment of the present application; Fig. 5 is a partial sectional view of AA in Fig. 4. Reference symbol: 10. Housing; 20. Roll core; 30. Pole; 1. Tab connection section; 2. Pole connection section; 3. Fuse; 4. Insulating section; 5. Insulating layer; 11. Second bending edge; 12. Tab connection body; 21. First bending edge; 22. Pole connection body. SPECIFIC EMBODIMENTS In this application, the terms "connected," "connect," "fasten," or similar, unless expressly stated otherwise, should be understood in a broad sense. For example, this can refer to a fixed, detachable, or one-piece connection, as well as a mechanical or electrical connection. Direct connections, indirect connections, or connections established via an intermediate piece, as well as internal connections between two elements or interactions between two elements are also conceivable. In the present application, a first feature that is arranged "above" or "below" a second feature may, unless expressly stated and defined otherwise, mean that the first feature directly touches the second feature, or that the first and second features are in contact without direct contact via a further feature arranged therebetween. Furthermore, a first feature that is arranged "on", "over" the second feature, and "above" the second feature may, among other things, mean that the first feature is directly above and diagonally above the second feature, or that the horizontal elevation of the first feature is higher than that of the second feature. A first feature that is arranged "below" the second feature and "below" the second feature may, among other things, mean thatIt may be the case that the first feature is directly below and diagonally below the second feature, or that the horizontal elevation of the first feature is lower than that of the second feature. In the description of the present embodiment, the terms "top," "bottom," "left," "right," etc., are used with reference to the illustrated orientation or positional relationship in the respective illustration, solely to describe the operation and, where appropriate, to simplify the description. In other words, these terms neither implicitly nor explicitly indicate the positioning, design, and operation of the device or element in question in a predetermined position, so that the application is not restricted here either. Furthermore, the terms "first" and "second," which have no particular meaning, are used merely to achieve a distinction in the description. The technical scheme of the present application is further illustrated below in conjunction with the accompanying drawings and by specific embodiments. When the battery is short-circuited, the circuit on the current collector disc is continuously turned on, the tab and the pole of the rolling core are continuously electrically connected, and the battery is continuously energized, resulting in severe heating of the internal structural parts of the battery under high current conditions for a long time, resulting in the explosion of the battery or the opening of the explosion-proof valve. To this end, the present embodiment provides a battery in which the battery is short-circuited, the battery current collector disc contained therein is cut off, so that the electrical connection between the tab and the pole of the rolling core is severed, and the circuit is cut off to prevent the serious heating inside the battery and cause the battery to explode or cause the explosion-proof valve to open the valve. Specifically, the positive and negative poles of the battery are output from the same end of the battery. In this embodiment, as shown in Fig. 1, the battery provided in this embodiment comprises a case 10, a rolling core 20, a terminal 30 and a battery current collector disc, wherein the battery current collector disc is arranged in the case 10 and is located between the rolling core 20 and the terminal 30, one side of the battery current collector disc is electrically connected to the terminal 30 and the other side is electrically connected to the tab of the rolling core 20. Optionally, the battery has a battery collecting plate, wherein the terminal 30 is the positive terminal, and the battery collecting plate is arranged between the positive tab and the terminal 30 of the rolling core 20 so that the terminal 30 is positively charged, and the negative tab of the rolling core 20 is connected to the housing 10 so that the housing 10 is negatively charged. Optionally, the battery has a battery collector plate, wherein the terminal 30 is a negative terminal, and the battery current collector disc is arranged between the negative tab and the terminal 30 of the rolling core 20 so that the terminal 30 is negatively charged, and the positive tab of the rolling core 20 is connected to the housing 10 so that the housing 10 is positively charged. Optionally, the battery has two battery current collector discs and two poles 30, and the two poles 30 are a positive pole and a negative pole, respectively, wherein one battery current collector disc is arranged between the positive tab and the positive pole of the rolling core 20 so that the positive pole is positively charged, and the other battery current collector disc is arranged between the negative tab and the negative pole of the rolling core 20 so that the negative pole is negatively charged. Specifically, as shown in Fig. 2, the battery current collector disk provided in this embodiment includes a tab connecting portion 1, a terminal connecting portion 2, and a fuse 3, wherein the terminal connecting portion 1 is electrically connected to the tab of the rolling core 20, and the terminal connecting portion 1 has an annular structure; The terminal connecting portion 2 is electrically connected to the terminal 30 of the battery, the terminal connecting portion 2 is arranged in the center of the tab connecting portion 1, and a circular gap is formed between the peripheral edge of the terminal connecting portion 2 and the inner peripheral edge of the tab connecting portion 1; The two ends of the fuse 3 are respectively connected to the peripheral edge of the terminal connecting portion 2 and the inner peripheral edge of the tab connecting portion 1. The terminal connecting portion 2 and the terminal connecting portion 1 of the battery current collector disc are electrically connected through the fuse 3, so that the terminal 30 is positively charged. When the battery is short-circuited, the internal temperature of the battery rises and the fuse 3 is blown out, thus preventing the battery from exploding due to a short circuit or the phenomenon of the explosion-proof valve opening, thus ensuring the safety of the battery. At the same time, the thickness of the battery current collector disc in the present embodiment does not increase, that is, after increasing the size of the fuse 3, it does not sacrifice the height of the roll core 20 as a cost and meets the electrical clearance requirement specified in the GB standard. The battery current collector disk according to the present embodiment further comprises an insulating portion 4, wherein the insulating portion 4 is arranged in a space formed by the terminal connecting portion 2, the tab connecting portion 1, and the fuse 3. The provision of the insulating portion 4 not only improves the stability of the connection between the terminal connecting portion 2 and the terminal connecting portion 1, but also acts as insulation protection, preventing the fuse 3 from being caught on the adjacent metal parts after blowing in and the circuit from being re-energized. As shown in Fig. 1, a small portion of the annular space between the terminal connecting portion 2 and the terminal connecting portion 1 is provided with a fuse 3, and the remaining portion is provided with an insulating portion 4. Optionally, a plurality of fuses 3 are provided, and the fuses 3 are evenly distributed around the circumference of the pole connection section 2. Preferably, in this embodiment, the number of fuses 3 is 1-3. As concretely shown in Fig. 2 and Fig. 5, the outer peripheral edge of the pole connecting portion 2 is bent in a side facing away from the tab to form a first bending edge 21, while the inner peripheral edge of the tab connecting portion 1 is bent in a side facing the tab to form a second bending edge 11, wherein the fuse 3 is connected between the first bending edge 21 and the second bending edge 11, wherein the insulating portion 4 is arranged in a space formed by the first and second bending edges and the fuse 3.The fuse 3 is connected to the end of the first bending edge 21 and the end of the second bending edge 11, and the arrangement of the first fuse 21 and the second bending edge 11 is such that one side of the fuse 3 toward the rolling core 20 is provided with an insulating portion 4 and the fuse 3 is further prevented from clamping the metal piece next to it after burning out, thereby re-energizing the circuit. As shown in Fig. 2 and Fig. 5, the terminal connecting portion 2 includes a terminal connecting body 22, wherein the first bending edge 21 is connected to the outer peripheral edge of the terminal connecting body 22, and the terminal connecting body 22 is electrically connected to the terminal; wherein the tab connecting portion 1 includes an annular tab connecting body 12, wherein the second bending edge 11 is connected to the inner peripheral edge of the tab connecting body 12, and the tab connecting body 12 is electrically connected to the tab. In the present embodiment, the terminal connecting body 22 and the first bending edge 21 are integrally molded, and the tab connecting bodies 12 and the second bending edge 11 are integrally molded. The pole connecting body 22 is welded to the end of the pole 30, and the tab connecting body 12 is welded to the tab of the rolling core 20. As shown in Fig. 5, on a side facing the tab, the surface of the tab connecting portion 1, the surface of the terminal connecting portion 2, and the surface of the insulating portion 4 are coplanar. It is understood that the surface of the tab connecting portion 1 facing the tab is the surface of the tab connecting body 12 facing the tab, and the surface of the tab connecting portion 2 facing the tab is the surface of the tab connecting body 22 facing the tab. This arrangement ensures the reasonable arrangement of the internal parts of the housing 10 and makes the insulating portion 4 as thick as possible, thus ensuring the stability of the connection between the terminal connecting portion 2 and the tab connecting portion 1. In this embodiment, the fuse 3 is connected to the edge of the first bending edge 21 and the second bending edge 11. As shown more specifically in Fig. 5, on a side facing away from the tab, the end face of the second bending edge 11, the surface of the insulating section 4, and the surface of the fuse 3 are flush. This arrangement further ensures the sensible arrangement of the internal parts of the housing 10 and makes the insulating section 4 as thick as possible, thus ensuring the stability of the connection between the pole connecting section 2 and the tab connecting section 1. In the present embodiment, the insulating section 4 is made of high-temperature-resistant plastic. The high-temperature-resistant plastic injection molding forms an insulating section 4 in the space enclosed by the first bending edge 21, the second bending edge 11, and the fuse 3. The high-temperature-resistant plastic can be polypropylene (PP), polyethylene terephthalate (PET), or polyimide (PI). It can be one of these or a mixture of two or three. As shown in Fig. 3 and Fig. 5, the battery current collector disk provided in this embodiment further includes a plurality of insulating layers 5, and the plurality of insulating layers 5 are arranged one above the other on the side of the terminal connecting portion 2 facing away from the terminal 30. The insulating layer 5, positioned at the outermost layer, abuts against the end of the roll core 20, and the insulating layer 5 is made of brown, high-temperature-resistant adhesive. The arrangement of the insulating layer 5 prevents contact between the tab of the roll core 20 and the terminal connecting portion 2 and renders the fuse 3 unable to play a protective role. In the present embodiment, the insulating layer 5 is provided with two layers. Preferably, the pole connecting body 22 is a circular structure, the first bending edge 21 is a circular structure, and the figure projected by the first bending edge 21 onto the plane in which the insulating layer 5 is located does not exceed the edge of the insulating layer 5, i.e., the insulating layer 5 is completely insulated and blocked between the pole connecting portion 2 and the rolling core 20, and the protective effect of the fuse 3 is still ensured. As shown in Fig. 1, in this case, the central part of the insulating layer 5 is attached to the side of the pole connecting body 22 facing away from the pole 30, and the edge of the insulating layer 5 is attached to the side of the insulating portion 4 facing away from the pole 30. Specifically, as shown in Fig. 4 and Fig. 5, the value range of the outer diameter a of the link connecting body 12 is 18mm≤a≤50mm. The value range of the diameter c of the pole connecting body 22 is 0≤c≤0.5a. The value range of the width d of fuse 3 is 0 <d≤0.6c. The range of values of the outer circle diameter b of the second turning edge 11 is: 0.2a≤b≤0.8a. The value range of the thickness f at the fuse 3 of the battery current collector disc is: 0 <f≤2mm. The value range of the thickness g of the tab connection body 12 is: 0 <g≤1mm. The value range of the thickness h of the pole connection body 22 is: 0 <h≤2mm. In dieser Ausführungsform ist die Dicke der Sicherung 3, der ersten Abbiegekante 21 und der zweiten Abbiegekante 11 alle gleich dem Polverbindungskörper 22. The specific design process of the fuse 3 of the battery current collector disc provided in this embodiment is as follows: 1. Calculate the current-carrying capacity of the battery current collector disc material and the temperature rise under short-circuit conditions. 2. Determine the cross-sectional area of the fuse 3 through the calculation results in step 1 to determine the width d of the fuse 3 so that the fuse 3 can be blown under certain short-circuit conditions and the current-carrying capacity of the entire battery collector disc is ensured under normal working conditions. 3. The design structure and position of the fuse 3 are determined through electromagnetic-thermal simulation. 4. The rationality of the design of the fuse 3 is verified through battery sample preparation and safety testing. It should be understood that the above embodiments of the present application are merely examples for the sake of clarity of description, without limiting the embodiments of the application. It is possible for those of ordinary skill in the art to make other variations or modifications of various forms based on the above description. A complete list of all possible embodiments is neither necessary nor possible here. Any modifications, equivalent substitutions, and improvements within the spirit and principle of the present application should be encompassed by the scope of the claims of the application.

Claims

A battery current collector disc, comprising a tab connecting portion (1) electrically connected to a tab of a battery, the tab connecting portion (1) having an annular structure; a terminal connecting portion (2) electrically connected to a terminal (30) of the battery, the terminal connecting portion (2) being arranged at a center of the tab connecting portion (1), and a circular gap being formed between a peripheral edge of the terminal connecting portion (2) and an inner peripheral edge of the tab connecting portion (1); a fuse (3), both ends of which are respectively connected to the peripheral edge of the terminal connecting portion (2) and the inner peripheral edge of the tab connecting portion (1). A battery current collector disc according to claim 1, further comprising an insulating portion (4), the insulating portion (4) being arranged in a space formed by the terminal connecting portion (2), the tab connecting portion (1) and the fuse (3). Battery current collector disc according to claim 2, wherein an outer peripheral edge of the pole connecting portion (2) is bent in a side facing away from the tab to form a first bending edge (21), while the inner peripheral edge of the tab connecting portion (1) is bent in a side facing away from the tab to form a second bending edge (11), wherein the fuse (3) is connected between the first bending edge (21) and the second bending edge (11), wherein the insulating portion (4) is arranged in a space formed by the first bending edge (21), the second bending edge (11) and the fuse (3). Battery current collector disc according to claim 2 or 3, wherein on a side facing the tab, a surface of the tab connecting portion (1), a surface of the pole connecting portion (2) and a surface of the insulating portion (4) are coplanar. Battery current collector disc according to claim 3, wherein on a side facing away from the tab, an end face of the second bending edge (11), a surface of the insulating section (4) and a surface of the fuse (3) are flush. Battery current collector disc according to claim 3 or 5, wherein the pole connecting portion (2) comprises a pole connecting body (22), wherein the first bending edge (21) is connected to an outer peripheral edge of the pole connecting body (22) and the pole connecting body (22) is electrically connected to the pole (30); wherein the tab connecting portion (1) has an annular tab connecting body (12), wherein the second bending edge (11) is connected to an inner peripheral edge of the tab connecting body (12) and the tab connecting body (12) is electrically connected to the tab. Battery current collector disc according to claim 6, wherein a value range of an outer diameter a of the tab connecting body (12) is 18 mm≤a≤50 mm; wherein a value range of a diameter c of the pole connecting body (22) is 0≤c≤0.5 a; wherein a value range of a width d of the fuse (3) is 0 <d≤0.6c beträgt. Battery current collector disc according to one of claims 1 to 7, wherein it further comprises a plurality of insulating layers (5) arranged one above the other on a side surface of the pole connection section (2) facing away from the pole (30). Battery current collector disc according to one of claims 1 to 8, wherein a plurality of fuses (3) are provided and the plurality of fuses (3) are evenly distributed around a circumference of the pole connecting portion (2). Battery current collector disc according to one of claims 2 to 7, wherein the insulating section (4) consists of a high-temperature-resistant plastic. Battery current collector disc according to claim 10, wherein the high temperature resistant plastic is polypropylene, polyethylene terephthalate or polyimide. A battery comprising a housing (10), a rolling core (20) and a pole (30), and further comprising a battery current collector disc according to any one of claims 1 to 11, wherein the battery current collector disc is arranged in the housing (10) and is located between the rolling core (20) and the pole (30), wherein the tab connecting portion (1) of the battery current collector disc is electrically connected to the tab of the rolling core (20) and the pole connecting portion (2) of the battery current collector disc is electrically connected to the pole (30).

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