Conducting strip and battery

Abstract

The utility model discloses a conducting strip which comprises two connecting metal pieces and a safety structure which are distributed along the axis direction, and the two connecting metal pieces are used for connecting a battery path; two opposite ends of the safety structure are respectively connected with the two connecting metal pieces; wherein the safety structure is heated to be bent, so that a connecting path between the two connecting metal pieces is disconnected; the utility model further discloses a battery which comprises a battery main body and a conducting strip, one end of the conducting strip is connected to the battery main body, the conducting strip is formed by connecting two connecting metal pieces and the safety structure, the safety structure has the characteristic of being bent after being heated, and when the temperature is too high during charging and discharging of the battery, the safety structure is bent after being heated; when the battery is charged or discharged, the access between the two connecting metal pieces is disconnected, and the battery stops charging or discharging, so that the energy density of the battery is maintained, and the safety performance of battery charging and discharging is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a conductive sheet and a battery. Background Art

[0002] The battery market and consumers' requirements for battery life have made the energy density of batteries higher and higher, which makes the battery safety performance more prominent. Rechargeable batteries are also widely used, such as 3C digital products, automotive batteries, and energy storage batteries. When existing rechargeable batteries are overcharged or short-circuited, the internal temperature of the battery rises sharply. When the temperature reaches a certain level, the battery may catch fire and explode. There will be heating, which poses a safety hazard. Utility Model Content

[0003] The purpose of the utility model is to overcome the above-mentioned defects in the prior art and provide a conductive sheet which can improve the charging and discharging safety performance of the battery while maintaining the energy density of the battery.

[0004] To achieve the above-mentioned purpose, in a first aspect, the utility model provides a conductive sheet, which is applied to a battery and has an axial direction. The conductive sheet includes:

[0005] Two connecting metal parts for connecting battery passages; and

[0006] The safety structure has two opposite ends connected to the two connecting metal parts respectively;

[0007] The safety structure is bent by heat to disconnect the connection path between the two connecting metal parts.

[0008] In the above technical solution, a notch is provided in the middle of the safety structure, and the notch extends along the vertical axis direction. The two ends of the safety structure are bent along the vertical axis direction when heated, and the bending directions of the two ends are opposite, and the safety structure breaks at the notch.

[0009] In the above technical solution, the insurance structure includes a soft metal part and two memory metal parts. The soft metal part is provided with notches. The memory metal part is connected to the soft metal part. The two memory metal parts are arranged relative to the soft metal part. Each connecting metal part is connected to one end of the memory metal part away from the soft metal part.

[0010] In the above technical solution, the material of the soft metal part is one of aluminum, tin and copper.

[0011] In the above technical solution, the safety structure includes an insulating connector and a memory metal part. The memory metal part is attached to one surface of the insulating connector, and two connecting metal parts are arranged on the other surface of the insulating connector along the axial direction. The ends of the two connecting metal parts are in contact; wherein the memory metal part is bent by heat, so that the two connecting metal parts are moved away from each other.

[0012] In the above technical solution, the material of the insulating connector is one of PP, PE, PET, PI, and PTFE, and its thickness ranges from 0.004 mm to 0.1 mm.

[0013] In the above technical solution, the safety structure is a memory metal piece, and the two ends of the memory metal piece are respectively connected to two connecting metal pieces. The memory metal piece is bent by heat, and one end of the memory metal piece is separated from one of the connecting metal pieces.

[0014] In the above technical solution, the material of the memory metal piece is one of a nickel-titanium alloy metal sheet, a copper-based memory metal sheet and an iron-based memory metal sheet.

[0015] In the above technical solution, the thickness of the conductive sheet ranges from 0.005 mm to 0.5 mm, the length of the conductive sheet ranges from 5 mm to 80 mm, and the width ranges from 3 mm to 6 mm.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] The conductive sheet of the technical solution is composed of two connecting metal parts and a safety structure. The safety structure has the characteristic of bending when heated. When the temperature of the battery is too high during charging and discharging, the safety structure bends when heated, disconnecting the path between the two connecting metal parts, and the battery stops charging or discharging. This improves the safety performance of battery charging and discharging while maintaining the battery energy density.

[0018] In a second aspect, an embodiment of the present application further provides a battery, comprising the conductive sheet in the above technical solution and a battery body; one end of the conductive sheet is connected to the battery body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a schematic structural diagram of a first embodiment of a conductive sheet provided by the utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the first embodiment of the conductive sheet provided by the utility model after being heated;

[0022] Figure 3 It is a schematic diagram of the structure of the insurance structure after being heated provided by this practical information;

[0023] Figure 4 This is a schematic structural diagram of a second embodiment of a conductive sheet provided by the utility model;

[0024] Figure 5 This is a schematic diagram of the structure of the second embodiment of the conductive sheet provided by the utility model after being heated;

[0025] Figure 6 This is a schematic structural diagram of a third embodiment of a conductive sheet provided by the utility model;

[0026] Figure 7 This is a schematic diagram of the structure of the third embodiment of the conductive sheet provided by the utility model after being heated;

[0027] Figure 8 It is a schematic diagram of the structure of the third embodiment of the conductive sheet provided by the utility model after being heated.

[0028] Reference numerals:

[0029] 100, connecting metal part; 110, contact end; 200, insurance structure; 210, memory metal part; 220, soft metal part; 221, notch; 230, insulating connector. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0034] When the battery is overcharged, the temperature surges, causing fire and explosion, posing a safety hazard.

[0035] In view of this, the utility model proposes a conductive sheet, which is applied to a battery and has an axial direction.

[0036] See also Figures 1 to 8 The conductive sheet shown includes two connecting metal pieces 100 and a safety structure 200 distributed along the axis direction. The two connecting metal pieces 100 are used to connect the battery path. The two opposite ends of the safety structure 200 are respectively connected to the two connecting metal pieces 100. The safety structure 200 is bent by heat to disconnect the connection path between the two connecting metal pieces 100. The conductive sheet is composed of two connecting metal pieces 100 and the safety structure 200. The safety structure 200 has the characteristic of bending by heat. When the conductive sheet is normal, the two connecting metal pieces 100 are in a path state. When the temperature of the battery is too high during charging and discharging, the safety structure 200 is bent by heat to disconnect the connection path between the two connecting metal pieces 100, and the battery stops charging or discharging, thereby improving the safety performance of battery charging and discharging.

[0037] In one embodiment of the present invention, Figures 1 to 2 As shown, a notch 221 is provided in the middle of the safety structure 200, and the notch 221 extends along the vertical axis direction. Figure 3 As shown, the two ends of the safety structure 200 are bent along the vertical axis direction by heat, and the bending directions of the two ends are opposite, and the conductive sheet breaks at the notch 221. The notch 221 is set so that the conductive sheet is quickly disconnected along the notch 221, and the cross section is neat. The notch 221 can be printed on the soft metal part 220 by embossing or laser, and the thickness of the soft metal part 220 changes under the action of pressure.

[0038] like Figures 1 to 3As shown, the insurance structure 200 includes a soft metal piece 220 and two memory metal pieces 210. The soft metal piece 220 is provided with a notch 221. The memory metal piece 210 is connected to the soft metal piece 220. The two memory metal pieces 210 are arranged relative to the soft metal piece 220. Each connecting metal piece 100 is connected to one end of the memory metal piece 210 away from the soft metal piece 220. The memory metal piece 210 has the characteristics of being conductive and deformable under heat. When the two memory metal pieces 210 are heated, the two memory metal pieces 210 bend along the vertical axis direction. The two memory metal pieces 210 bend in two opposite directions, respectively pulling the two ends of the soft metal piece 220, so that the soft metal piece 220 is stressed and breaks along the notch 221.

[0039] In some structural forms, the material of the soft metal part 220 is one of aluminum, tin, and copper. Aluminum, tin, and copper have good ductility, strong plasticity, and are easy to cast and forge, and the thickness of the soft metal part 220 can be selected according to needs. In this embodiment, the soft metal part 220 is made of metal aluminum.

[0040] In some structural forms, the material of the memory metal piece 210 is one of a nickel-titanium alloy metal sheet, a copper-based memory metal sheet, and an iron-based memory metal sheet. This type of memory metal piece 210 has the characteristics of large bending capacity and high plasticity, can remember the temperature, and can restore its original shape by itself. The memory metal piece 210 is a flat memory metal sheet obtained by high-temperature bending to shape the memory metal piece, and then cooling and hammering. When the memory metal piece 210 is heated, the memory metal piece 210 is transformed from a flat memory metal sheet to a bent memory metal sheet. By utilizing the characteristics of the memory metal piece 210, the two connecting metal pieces 100 in the conductive sheet are disconnected to improve the safety performance of the battery; wherein, Figure 3 In this embodiment, the two memory metal pieces 210 are made of the same material. When the connecting metal piece 100 and the memory metal piece 210 are connected, the direction of one of the memory metal pieces 210 is reversed so that the two memory metal pieces 210 are heated and move vertically. Figure 3 The axis direction is bent, and the bending directions of the two memory metal pieces 210 are opposite.

[0041] In this embodiment, the soft metal part 220, the memory metal part 210 and the connecting metal part 100 are connected by welding to ensure that the conductive sheet is not easily separated from the connection when in use. When the memory metal part 210 is bent by heat, the connection between the connecting metal part 100 and the memory metal part 210 is also partially cracked to prevent the connecting metal part 100 from restricting the deformation of the memory metal part 210.

[0042] In another embodiment of the present invention, Figures 4 to 5As shown, the safety structure 200 includes an insulating connector 230 and a memory metal member 210. The memory metal member 210 is attached to one surface of the insulating connector 230. Two connecting metal members 100 are arranged on the other surface of the insulating connector 230 along the axial direction. The ends of the two connecting metal members 100 are in contact. The memory metal member 210 is bent by heat, so that the two connecting metal members 100 are separated from each other. When the memory metal member 210 is bent by heat, an angle is formed, and the two connecting metal members 100 are separated from each other along with the memory metal member 210 and no longer in contact, so that the conductive sheet is disconnected to improve the safety performance of the battery.

[0043] In this embodiment, the memory metal piece 210 and the two connecting metal pieces 100 are connected to the surface of the insulating connector 230 by gluing, and have a high connection strength, so that the memory metal piece 210 and the two connecting metal pieces 100 are not easily peeled off from the surface of the insulating connector 230.

[0044] like Figure 4 As shown, in this embodiment, one end of each connecting metal member 100 is bent to form a contact end 110. When the conductive sheet is in a normal environment, the contact ends of the two connecting metal members 100 contact each other, and the conductive area is large, thereby ensuring the normal use of the battery.

[0045] In some structural forms, the material of the insulating connector 230 is one of polypropylene (PP), polyethylene (PE), polyethylene glycol terephthalate (PET), polyimide (PI), and polytetrafluoroethylene (PTFE). Such materials have good insulation properties, high softness, and can be bent arbitrarily. The thickness range is 0.004mm to 0.1mm, ensuring that the insulating connector 230 is within this thickness range. Under normal circumstances, the two connecting metal parts 100 are connected and a connecting path is formed, and when heated, it can also be bent arbitrarily with the memory metal part 210. In this embodiment, PP is used as the insulating connector 230, and the thickness of the insulating connector 230 can be selected from 0.004mm, 0.006mm, 0.012mm, 0.014mm, 0.05mm, 0.07mm, 0.09mm, 0.1mm, including but not limited to these values. In this embodiment, the thickness of the insulating connector 230 is set to 0.05mm.

[0046] In some structural forms, the material of the connecting metal part 100 is one of aluminum, copper, and nickel, wherein the memory metal part 210, the soft metal part 220, and the connecting metal part 100 are all rectangular structures, which facilitates the connection of the various components and makes the appearance of the assembled conductive sheet neat.

[0047] In yet another embodiment of the present invention, Figure 6 to Figure 7 As shown, the insurance structure 200 is a memory metal piece 210, and the two ends of the memory metal piece 210 are respectively connected to the two connecting metal pieces 100. The memory metal piece 210 is bent by heat, and one end of the memory metal piece 210 is separated from one of the connecting metal pieces 100. In some structural forms, the two ends of the memory metal piece 210 are connected to the connecting metal pieces 100 by welding; Figure 8 As shown, a bending position is set for the memory metal piece 210. When the memory metal piece 210 is heated, the memory metal piece 210 deforms and bends according to the bending position to disconnect the conductive sheet, thereby breaking the circuit of the battery and preventing the reaction from continuing to occur, thereby preventing the battery from thermal runaway, fire and explosion.

[0048] In some structural forms, the thickness of the conductive sheet ranges from 0.005mm to 0.5mm, the length of the conductive sheet ranges from 5mm to 80mm, and the width ranges from 3mm to 6mm. The thickness of the conductive sheet can be selected from 0.005mm, 0.007mm, 0.015mm, 0.023mm, 0.037mm, 0.24mm, 0.39mm, 0.5mm, including but not limited to the values ​​shown here, the length of the conductive sheet can be selected from 5mm, 9mm, 24mm, 39mm, 62mm, 75mm, 80mm, including but not limited to the values ​​shown here, and the width of the conductive sheet can be selected from 3mm, 3.5mm, 3.8mm, 4.2mm, 5.1mm, 5.8mm, 6mm, including but not limited to the values ​​shown here.

[0049] In summary, when the conductive sheet is at normal temperature, the memory metal part 210 is in a flat state, and when the battery temperature reaches 90°C to 125°C, the memory metal part 210 is bent or folded after being heated, so that the conductive sheet breaks in the middle of the soft metal part 220 or the two connecting metal parts 100 are separated from each other or one end of the memory metal part 210 is disconnected from one of the connecting metal parts 100, so that the conductive sheet is in a disconnected path state, so as to achieve the purpose of improving the safety performance of the battery.

[0050] The utility model also provides a battery, including a battery body and a conductive sheet, one end of which is connected to the battery body. The specific structure of the conductive sheet is referred to the above embodiment. Since the battery adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0051] In this embodiment, the battery body is provided with a connection terminal to facilitate the installation of the conductive sheet, one end of the conductive sheet is welded to the connection terminal, and the other end of the conductive sheet is connected to the electronic component. When the battery is overcharged and discharged, the battery temperature surges, and the conductive sheet is disconnected due to heat, which protects the electronic components and prevents the battery from overheating and exploding.

[0052] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principle of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A conductive sheet, applied to a battery, having an axial direction; characterized in that: Including distributed along the axis direction: Two connecting metal parts (100) for connecting battery passages; and The safety structure (200) has two opposite ends respectively connected to the two connecting metal pieces (100); The safety structure (200) is bent by heat, so that the connection path between the two connecting metal parts (100) is disconnected.

2. A conductive sheet according to claim 1, characterized in that: A notch (221) is provided in the middle of the safety structure (200), and the notch (221) is extended in a direction perpendicular to the axis. The two ends of the safety structure (200) are bent in a direction perpendicular to the axis when heated, and the bending directions of the two ends are opposite. The safety structure (200) breaks at the notch (221).

3. A conductive sheet according to claim 2, characterized in that: The safety structure (200) comprises a soft metal piece (220) and two memory metal pieces (210); the soft metal piece (220) is provided with the notch (221); the memory metal piece (210) is connected to the soft metal piece (220); the two memory metal pieces (210) are arranged relative to the soft metal piece (220); and each of the connecting metal pieces (100) is connected to one end of the memory metal piece (210) away from the soft metal piece (220).

4. A conductive sheet according to claim 3, characterized in that: The material of the soft metal part (220) is one of aluminum, tin and copper.

5. The conductive sheet according to claim 1, characterized in that: The safety structure (200) comprises an insulating connector (230) and a memory metal part (210), wherein the memory metal part (210) is attached to one surface of the insulating connector (230), and the two connecting metal parts (100) are arranged on the other surface of the insulating connector (230) along the axial direction, with the ends of the two connecting metal parts (100) in contact; wherein the memory metal part (210) is bent by heat, so that the two connecting metal parts (100) are moved away from each other.

6. A conductive sheet according to claim 5, characterized in that: The insulating connector (230) is made of a material selected from the group consisting of PP, PE, PET, PI, and PTFE, and has a thickness ranging from 0.004 mm to 0.1 mm.

7. The conductive sheet according to claim 1, characterized in that: The safety structure (200) is a memory metal piece (210), the two ends of the memory metal piece (210) are respectively connected to the two connecting metal pieces (100), and the memory metal piece (210) is bent by heat, so that one end of the memory metal piece (210) is separated from one of the connecting metal pieces (100).

8. A conductive sheet according to any one of claims 3 to 7, characterized in that: The material of the memory metal piece (210) is one of a nickel-titanium alloy metal sheet, a copper-based memory metal sheet and an iron-based memory metal sheet.

9. The conductive sheet according to claim 1, characterized in that: The thickness of the conductive sheet is in the range of 0.005 mm to 0.5 mm, the length of the conductive sheet is in the range of 5 mm to 80 mm, and the width of the conductive sheet is in the range of 3 mm to 6 mm.

10. A battery, comprising a conductive sheet according to any one of claims 1 to 9, characterized in that: It comprises a battery main body, and one end of the conductive sheet is connected to the battery main body.

Images