Adapter sheet fusing structure and battery

Abstract

The utility model provides an adapter sheet fusing structure and a battery, the adapter sheet fusing structure comprises an adapter sheet body, the adapter sheet body is provided with a fusing area, and the sectional area of the fusing area is smaller than the sectional areas of other positions on the adapter sheet body; the fusing area comprises grooves and / or through holes formed in the adapter sheet body, the grooves are in a continuous slender strip shape and / or are distributed at intervals, and the through holes are uniformly distributed at intervals; the adapter body is further sleeved with a protective shell, the protective shell is made of insulating materials, a protective cavity is formed in the protective shell, and the fusing area is located in the protective cavity. When a large current is generated at the moment of short circuit of the anode and the cathode, the heating value is large to realize a fusing function, the anode and the cathode are disconnected to finish short-circuit protection of the battery, the sectional area of a fusing region can be effectively reduced by adopting a slotting or trepanning mode, the conventional switching function is still not influenced, the processing is simple, and the use cost is low; the protective shell can prevent the two free ends of the battery from being in contact again to cause short circuit in the subsequent shaking process.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to an adapter sheet melting structure and a battery. Background Technology

[0002] Lithium-ion batteries, characterized by high energy density and long cycle life, are increasingly widely used in energy storage and automotive fields. Electric vehicles offer many significant advantages over gasoline-powered vehicles, such as faster acceleration and lower energy consumption per 100 kilometers, leading to a substantial increase in demand. While electric vehicles bring convenience to people's lives, battery safety has also attracted widespread attention.

[0003] There are a series of national standard safety tests for batteries, such as needle penetration, compression, overcharge, over-discharge, and short circuit. Passing these tests means the battery will not catch fire or explode. Specifically, when the positive and negative terminals of the battery are short-circuited externally, the instantaneous current can reach over 2000A. If this high current is maintained for 5 minutes, it will cause the battery cell to overheat severely and may even smoke and catch fire. Battery short-circuit safety is one of the key technologies in batteries. Currently, the main way to solve this problem is to have the separator close its pores when exposed to high temperatures, blocking lithium ions from flowing from the negative electrode to the positive electrode, thus cutting off the current between the positive and negative electrodes. In principle, this method can effectively prevent the risk of fire and explosion after a battery short circuit, but the separator is expensive, which is not conducive to reducing battery costs and large-scale application. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of the aforementioned background technology by providing a fuse structure for a connector that disconnects the positive and negative electrodes during a short circuit, thereby eliminating current flow between them, and a battery solution.

[0005] To achieve the above objectives, this utility model provides a connecting piece fusion structure, including a connecting piece body, wherein a fusion area is provided on the connecting piece body, and the cross-sectional area of ​​the fusion area is smaller than the cross-sectional area of ​​other positions on the connecting piece body.

[0006] The fusion zone includes grooves and / or through holes formed on the adapter plate body. The grooves are continuous elongated strips and / or spaced apart, and the through holes are evenly spaced apart.

[0007] The adapter plate body is also fitted with a protective shell, which is made of insulating material. The protective shell has a protective cavity inside, and the fusible area is located inside the protective cavity. The size of the protective cavity matches that of the adapter plate body.

[0008] Furthermore, the fusion break area includes a first groove on the adapter body and a first through hole in the first groove. The first groove is configured as a long and thin strip and extends through the left and right sides of the adapter body. The first through holes are evenly distributed in the first groove.

[0009] Furthermore, the fusion zone includes a second groove on the front side of the adapter body and a third groove on the back side of the adapter body, both of which are elongated strips.

[0010] Furthermore, the fusion break zone includes a second through hole opened on the adapter plate body.

[0011] Furthermore, the fusion break zone includes a bent portion disposed on the adapter plate body, the thickness of the bent portion being less than the thickness of other areas of the adapter plate body, and a third through hole being provided on the bent portion.

[0012] Furthermore, the size of the protective cavity is set to be an interference fit with the body of the adapter plate.

[0013] This utility model also provides a battery that adopts the aforementioned adapter sheet fusion structure.

[0014] The above-mentioned solution of this utility model has the following beneficial effects:

[0015] The adapter sheet fusing structure and battery provided by this utility model, through the setting of a fusing area with a smaller cross-sectional area, can achieve the fusing function when a large current of 2000A is generated instantaneously during a short circuit between the positive and negative electrodes. This generates a large amount of heat and disconnects the positive and negative electrodes to complete the short circuit protection of the battery. The use of slots or holes can effectively reduce the cross-sectional area of ​​the fusing area, while the conventional adapter function is still unaffected. It is simple to process and has low operating costs. In addition, the protective shell of this utility model can ensure that after the fusing area melts instantaneously during a large current, the free ends of the two parts of the adapter sheet body are still well limited within the protective cavity, preventing the two free ends from re-contacting and causing a short circuit during subsequent shaking of the battery.

[0016] Other beneficial effects of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the adapter plate body of the present invention (first specific embodiment);

[0018] Figure 2 This is a schematic diagram of the overall structure of the present invention (second specific embodiment);

[0019] Figure 3This is a schematic diagram of the overall structure of the present invention (third specific embodiment);

[0020] Figure 4 This is a schematic diagram of the overall structure of the present invention (fourth specific embodiment);

[0021] Figure 5 This is a schematic diagram of the overall structure of this utility model (including the protective shell).

[0022] [Explanation of Labels in the Attached Image]

[0023] 1-Adapter plate body; 2-Fuse area; 3-First groove; 4-First through hole; 5-Second groove; 6-Third groove; 7-Second through hole; 8-Bending part; 9-Third through hole; 10-Protective shell. Detailed Implementation

[0024] To make the technical problems, solutions, and advantages of this utility model clearer, a detailed description will be provided below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0025] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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 utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a locking connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] like Figure 1As shown, an embodiment of this utility model provides a fuse structure for an adapter piece, including an adapter piece body 1. A fuse region 2 is provided on the adapter piece body 1. The fuse region 2 has a relatively small cross-sectional area and acts as a current bottleneck area. Under normal discharge rates, the temperature rise is controlled within a certain range, and the fuse region 2 remains unchanged. When a large current of 2000A is generated during a short circuit, the small cross-sectional area of ​​the fuse region 2 results in a large amount of heat generated when the current passes through, thereby achieving the fuse function of fusing the fuse region 2, disconnecting the positive and negative terminals, and realizing short-circuit protection for the battery.

[0028] In one specific embodiment of this example, the fusing region 2 includes a first groove 3 formed on the adapter body 1 and a first through hole 4 further formed in the first groove 3. The first groove 3 is elongated and extends through both sides of the adapter body 1. The first through holes 4 are evenly distributed within the first groove 3, thereby further reducing the cross-sectional area of ​​the fusing region 2.

[0029] It should be noted that the dimensions of the first groove 3 and the first through hole 4 are designed to keep the temperature rise within a certain range during 2C discharge, and to allow them to melt instantly when a large current is passed through them. Those skilled in the art can make adjustments based on a limited number of experiments.

[0030] At the same time, such as Figure 2 As shown, in another specific embodiment of this example, the fusing area 2 includes a second groove 5 formed on the front side of the adapter body 1 and a third groove 6 formed on the back side of the adapter body 1. The second groove 5 and the third groove 6 are also continuous elongated strips, which also reduces the cross-sectional area of ​​the fusing area 2. Its size design is based on controlling the temperature rise within a certain range during 2C discharge, allowing for instantaneous fusing when a large current is applied.

[0031] At the same time, such as Figure 3 As shown, in the third specific embodiment of this example, the fusing region 2 includes a second through hole 7 opened on the adapter body 1, and the second through holes 7 are evenly distributed on the adapter body 1. Obviously, this method can also reduce the cross-sectional area of ​​the fusing region 2, and the temperature rise can remain within a higher range without melting.

[0032] At the same time, such as Figure 4As shown, in the fourth specific embodiment of this example, the fuse-breaking area 2 includes a bent portion 8 on the adapter body 1. The thickness of the bent portion 8 is less than that of other areas of the adapter body 1, and the front and rear parts of the adapter body 1 have a certain height difference to accommodate specific positive and negative electrode connections. Of course, a third through hole 9 can also be further formed on the bent portion 8. This method can also reduce the cross-sectional area of ​​the fuse-breaking area 2. Its size design is also based on controlling the temperature rise within a certain range during 2C discharge, allowing for instantaneous melting when a large current is applied. Furthermore, the bent portion 8 allows the free ends of the front and rear parts of the adapter body 1 to be misaligned after the fuse-breaking area 2 melts, making it more difficult for the fuse-breaking area to make contact.

[0033] In summary, when designing the fuse zone 2, its overall cross-sectional area needs to be smaller than the cross-sectional area of ​​other parts of the adapter plate body 1, so that it can melt before other parts under high current (instantaneous melting) to protect the battery cell. Using slots or holes can effectively reduce the cross-sectional area of ​​the fuse zone 2; other effective methods can also be used.

[0034] It should be noted that when the current on the adapter body 1 is too high and the fuse 2 blows, the adapter body 1 will separate into two parts, front and back. These two parts remain inside the battery and connected to the corresponding positive or negative terminal. In subsequent processes, the two parts of the adapter body 1 may still come into contact at their free ends due to battery movement or other conditions, causing a short circuit. Therefore, as follows... Figure 5 As shown, in this embodiment, a protective shell 10 is also fitted onto the adapter body 1. The protective shell 10 is made of insulating material, and its center corresponds to the fuse zone 2. A protective cavity is provided inside the protective shell 10. When the fuse zone 2 melts instantaneously under high current, the free ends of the two parts of the adapter body 1 remain within the protective cavity. Because the size of the protective cavity matches and fits the adapter body 1, the two free ends can still be well contained by the protective cavity, preventing the two free ends from re-contacting during subsequent battery shaking.

[0035] In a preferred embodiment, the size of the protective cavity is set to be an interference fit with the adapter plate body 1, or to be fixed with the adapter plate body 1 by relying on the elastic force of the material.

[0036] When the fusible region 2 heats up under the action of a large current, the protective shell 10 will also be heated. Therefore, the material used for the protective shell 10 needs to remain unchanged under the temperature environment where the fusible region 2 melts, so as to maintain and stabilize the free ends of the front and rear parts of the adapter body 1 after the fusible region 2 melts.

[0037] Based on the same innovative concept, this embodiment also provides a battery that employs the aforementioned adapter sheet fusion structure. The technical concept and effects of this battery are similar to those described above, and will not be repeated here.

[0038] 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.

[0039] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the 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 application should be determined by the appended claims.

Claims

1. A fuse structure for an adapter piece, characterized in that, Includes an adapter plate body, wherein a fusible area is provided on the adapter plate body, and the cross-sectional area of ​​the fusible area is smaller than the cross-sectional area of ​​other locations on the adapter plate body; The fusion zone includes grooves and / or through holes formed on the adapter plate body. The grooves are continuous elongated strips and / or spaced apart, and the through holes are evenly spaced apart. The adapter plate body is also fitted with a protective shell, which is made of insulating material. The protective shell has a protective cavity inside, and the fusible area is located inside the protective cavity. The size of the protective cavity matches that of the adapter plate body.

2. The adapter piece fusion structure according to claim 1, characterized in that, The fusion zone includes a first groove on the adapter body and a first through hole in the first groove. The first groove is elongated and extends through the left and right sides of the adapter body. The first through holes are evenly spaced within the first groove.

3. The adapter piece fusion structure according to claim 1, characterized in that, The fusion zone includes a second groove on the front side of the adapter body and a third groove on the back side of the adapter body, both of which are elongated strips.

4. The adapter piece fusion structure according to claim 1, characterized in that, The fusion zone includes a second through hole opened on the adapter plate body.

5. The adapter piece fusion structure according to claim 1, characterized in that, The fusion zone includes a bent portion disposed on the adapter plate body. The thickness of the bent portion is less than the thickness of other areas of the adapter plate body. A third through hole is provided on the bent portion.

6. The adapter piece fusion structure according to claim 1, characterized in that, The size of the protective cavity is set to be an interference fit with the body of the adapter plate.

7. A battery, characterized in that, The adapter sheet fusion structure as described in any one of claims 1-6 is adopted.

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