CN216015609U

CN216015609U - Circuit protection structure and battery

Info

Publication number: CN216015609U
Application number: CN202122015008.3U
Authority: CN
Inventors: 计泓冶; 刘少钟; 秦峰; 王志
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2021-08-25
Filing date: 2021-08-25
Publication date: 2022-03-11
Anticipated expiration: 2031-08-25

Abstract

The application provides a circuit protection structure and a battery, which comprise a flexible conductive unit and a heat-resistant layer, wherein the flexible conductive unit comprises a metal layer and an insulating layer coated outside the metal layer; the heat-resistant layer is solidified and molded in a preset shape and covers the outer layer of the insulating layer in the extending direction of the flexible conductive unit. This application has following advantage: the insulating layer with the shape solidification is predetermine to the outside setting of flexible conductive unit, can form the outside of the flexible conductive unit of the different adjacent structures of adaptation, and simultaneously because the outer layer that the heat-resisting layer had formed the solidification also can adapt to instruments such as anchor clamps of assembly, can also promote the production assembly speed of circuit. The battery provided with the flexible conductive unit can improve the heat resistance of the functional circuit using the flexible conductive unit under the heating condition, thereby ensuring the normal function of the functional circuit.

Description

Circuit protection structure and battery

Technical Field

The application relates to the field, in particular to a circuit protection structure for enhancing the safety performance of a circuit structure and a battery.

Background

At present, the social progress faces a severe situation due to environmental energy problems, and low carbon and environmental protection become a major theme of future economic development. Energy storage and efficient use have attracted attention in various respects, with lithium ion battery cells existing as the smallest unit for energy storage. The battery is a structural form which effectively connects a plurality of battery monomers, and meets the requirement of supplying power for electric equipment by carrying out series/parallel/series-parallel connection on a certain number of battery monomers. How to guarantee the structural strength and the safety performance of the single batteries in the box body is a technical problem to be solved urgently in the current batteries.

Disclosure of Invention

The technical problem that this application will be solved lies in providing a circuit protection structure, solves the not enough problem of protection security of current flexible circuit structure.

The application is realized as follows: a circuit protection structure comprises a flexible conductive unit and a heat-resistant layer,

the flexible conductive unit comprises a metal layer and an insulating layer coated outside the metal layer;

the heat-resistant layer is solidified and molded in a preset shape and covers the outer layer of the insulating layer in the extending direction of the flexible conductive unit.

Optionally, the circuit protection structure further includes a line pin, where the line pin includes a metal lead and a lead insulating layer, and the metal lead passes through the heat-resistant layer and is electrically connected to the metal layer of the flexible conductive unit.

Optionally, the heat-resistant layer is formed on the outer layer of the insulating layer in one step.

Optionally, the heat-resistant layer includes a first heat-resistant layer disposed below the flexible conductive unit and a second heat-resistant layer disposed above the flexible conductive unit.

Optionally, the first heat-resistant layer and the second heat-resistant layer have the same composition.

Optionally, the first heat-resistant layer and the second heat-resistant layer are different in composition.

Alternatively,

the outer surface of the heat-resistant layer further comprises at least one clamping groove formed by inwards sinking, the clamping groove extends along the length direction, and the shape of the clamping groove is matched with that of the outer wall of the battery.

Optionally, the left side and the right side below the heat-resistant layer are respectively provided with a clamping groove.

Optionally, the heat-resistant layer is made of one or more of silicone, epoxy, polyurethane, PC + ABS, PA, PBT, and PPS.

Optionally, the flexible conductive unit is an FFC or an FPC.

A battery comprises more than two battery monomers, a sensing unit and a circuit protection structure, wherein the circuit protection structure comprises a flexible conductive unit and a heat-resistant layer,

the battery cells are arranged side by side along a first direction, the circuit protection structure is arranged in a gap between the adjacent battery cells,

the heat-resistant layer is solidified and molded in a preset shape in the extending direction of the flexible conductive unit and covers the outer layer of the insulating layer, and the metal layer of the flexible conductive unit is electrically connected with the sensing unit in the battery pack;

the first direction is perpendicular to a direction in which the flexible conductive unit extends.

Optionally, the shape of the bottom of the heat-resistant layer is matched with the shape of the outer wall of the battery cell.

Optionally, the circuit protection structure further includes a line pin, and the metal layer is electrically connected to the sensing unit through the line pin.

Optionally, the sensing unit comprises a voltage detection unit and/or a temperature detection unit.

This application has following advantage: the insulating layer with the shape solidification is predetermine to the outside setting of flexible conductive unit, can form the outside of the flexible conductive unit of the different adjacent structures of adaptation, and simultaneously because the outer layer that the heat-resisting layer had formed the solidification also can adapt to instruments such as anchor clamps of assembly, can also promote the production assembly speed of circuit. The battery provided with the flexible conductive unit can improve the heat resistance of the functional circuit using the flexible conductive unit under the heating condition, thereby ensuring the normal function of the functional circuit.

Drawings

FIG. 1 is a schematic cross-sectional view of a circuit protection architecture according to an embodiment of the present application;

fig. 2 is an exploded view of a heat resistant layer of a circuit protection structure according to an embodiment of the present invention;

fig. 3 is a diagram illustrating a circuit protection structure and a battery mounting structure according to an embodiment of the present invention.

Description of reference numerals:

1. a flexible conductive unit for electrically connecting the conductive element,

10. a metal layer,

11. an insulating layer is formed on the substrate,

2. a heat-resistant layer,

21. a first insulating layer, a second insulating layer,

22. a second insulating layer is formed on the first insulating layer,

23. a clamping groove is arranged on the upper surface of the shell,

3. a lead-out pin of the circuit is provided,

31. a metal lead-in wire is arranged on the metal lead-in wire,

32. an insulating layer for the lead wires,

4. and (4) a battery cell.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different elements and not for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "attached" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The term "and/or" in this application is only one kind of association relationship describing the associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" in this application generally indicates that the former and latter related objects are in an "or" relationship.

The "plurality" in the present application means two or more (including two), and similarly, "plural" means two or more (including two) and "plural" means two or more (including two).

In the present application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiments of the present application.

Reference to a battery in embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, etc. Batteries generally include a case for enclosing one or more battery cells. The box can avoid liquid or other foreign matters to influence the charging or discharging of battery monomer.

A plurality of battery cells may be connected in series and/or in parallel via electrode terminals to be applied to various applications. In some high power applications, such as electric vehicles, the application of batteries includes three levels: battery monomer, battery module and battery package. The battery module is formed by electrically coupling a certain number of battery cells together and putting them in a frame in order to protect the battery cells from external impact, heat, vibration, etc. The battery pack is the final state of the battery system installed in the electric vehicle. A battery pack generally includes a case for enclosing one or more battery cells. The box can avoid liquid or other foreign matters to influence the charging or discharging of battery monomer. The box body generally consists of a cover body and a box shell. Most of the current battery packs are manufactured by mounting various control and protection systems such as a Battery Management System (BMS), a thermal management part, etc. on one or more battery modules. As technology develops, this level of battery modules may be omitted, i.e., battery packs are formed directly from battery cells. The improvement leads the weight energy density and the volume energy density of the battery system to be improved, and simultaneously, the number of parts is obviously reduced. The battery referred to in this application includes a battery module or a battery pack.

The battery monomer comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive plate, a negative plate and an isolating membrane. The battery cell mainly depends on metal ions moving between the positive plate and the negative plate to work. The positive plate comprises a positive current collector and a positive active substance layer, wherein the positive active substance layer is coated on the surface of the positive current collector, the current collector which is not coated with the positive active substance layer protrudes out of the current collector which is coated with the positive active substance layer, and the current collector which is not coated with the positive active substance layer is used as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece includes negative current collector and negative pole active substance layer, and the negative pole active substance layer coats in the surface of negative current collector, and the mass flow body protrusion in the mass flow body of coating the negative pole active substance layer of uncoated negative pole active substance layer, the mass flow body of uncoated negative pole active substance layer is as negative pole utmost point ear. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the fuse is not fused when a large current is passed, the number of the positive electrode tabs is multiple and the positive electrode tabs are stacked together, and the number of the negative electrode tabs is multiple and the negative electrode tabs are stacked together. The material of the diaphragm can be PP or PE, etc. In addition, the electrode assembly may have a winding structure or a lamination structure, and the embodiment of the present application is not limited thereto.

The tabs generally include a positive tab and a negative tab. Specifically, the positive pole piece comprises a positive pole current collector and a positive pole active substance layer, wherein the positive pole active substance layer is coated on the surface of the positive pole current collector, the positive pole current collector which is not coated with the positive pole active substance layer protrudes out of the positive pole current collector which is coated with the positive pole active substance layer, the positive pole current collector which is not coated with the positive pole active substance layer is used as a positive pole lug, the positive pole current collector can be made of aluminum, and the positive pole active substance can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate and the like; the negative pole piece includes negative pole mass flow body and negative pole active substance layer, and the surface of negative pole mass flow body is scribbled to the negative pole active substance layer, and the negative pole mass flow body protrusion in the negative pole mass flow body of having scribbled the negative pole active substance layer of not scribbling the negative pole active substance layer, and the negative pole mass flow body of not scribbling the negative pole active substance layer is as negative pole utmost point ear. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the fuse is not fused when a large current is passed, the number of the positive electrode tabs is multiple and the positive electrode tabs are stacked together, and the number of the negative electrode tabs is multiple and the negative electrode tabs are stacked together.

The application discloses power consumption device, including vehicles such as electric bicycle, electric automobile, aircraft, EMUs, ship. Some examples of applications that may be used are battery packs and vehicle bodies. The battery pack is provided to the vehicle body. Wherein, the vehicle is new energy automobile, and it can be pure electric automobile, also can hybrid vehicle or increase form car. The vehicle main body is provided with a power source, the power source is configured to be electrically connected with the battery pack, the battery pack provides electric energy, and the battery pack is connected with wheels on the vehicle main body through a transmission mechanism so as to drive the automobile to move. Preferably, the battery pack may be horizontally disposed at the bottom of the vehicle body.

However, the battery module is complicated in actual operation, for example, when the battery module is applied to an electric vehicle, since the operation state of the battery in the life cycle is greatly changed, in order to ensure the operation safety, various parameters of the battery in the operation state need to be carried out, and a plurality of circuits which operate inside the battery need to be provided; meanwhile, the electric automobile has compact body and limited space envelope, so that the module needs to realize a structure with small volume and large stored energy; when the battery pack is used on a large-scale energy storage electric cabinet, a structural form which can effectively connect batteries in series in groups and fix the batteries needs to be provided, and meanwhile, reliable electrical connection is realized.

In the prior art, when the battery module is configured in a box, some detection circuits or protection cut-off circuits are usually required to be designed in the box. However, under a complex dynamic load condition, a risk of thermal runaway of the battery cell is usually accompanied, so that when the battery cell is in thermal runaway, the detection circuit is likely to be directly damaged or the protection cutoff circuit is likely to be damaged. Thereby affecting the safety of the whole box body.

Referring to fig. 1 and fig. 2, a circuit protection structure according to the present application includes a flexible conductive unit 1 and a heat-resistant layer 2, where the flexible conductive unit 1 includes a metal layer 10 and an insulating layer 11 wrapped outside the metal layer 10, and the heat-resistant layer 2 is cured and formed in a predetermined shape in an extending direction of the flexible conductive unit 1 and wrapped on an outer layer of the insulating layer 11.

The circuit protection structure can be arranged in a battery, and can also be suitable for any live line with severe working environment, such as a cabinet, a power distribution cabinet, a server and the like. The insulating layer 11 is made of a material which is added outside the metal layer 10 of the conventional flexible conductive unit 1, such as soft plastic, and the heat-resistant layer 2 made of flexible materials such as plastic films and rubber is coated on the outer layer of the flexible conductive unit 1, so that the heat-resistant performance of the flexible conductive unit 1 can be enhanced, the overheat state of the service environment caused by different working conditions in the use process of the battery can be resisted, and the service life of the flexible conductive unit 1 is prolonged. Because heat-resistant layer 2 is set up to predetermine the structure that the shape solidification came out, then heat-resistant layer 2 can also promote the rigidity of whole electrified circuit, protects the inner structure of the heat-resistant layer 2 of solidification, if again when the wiring sets up, whole circuit protection architecture can be got by pressing from both sides, glue and get, modes such as sucking disc absorption are installed or the configuration, can promote the assembly efficiency and the automation level of whole circuit.

Optionally, the heat-resistant layer 2 is formed by curing according to a predetermined shape, where the predetermined shape may be adapted to the shape of the bottom plate and the corner of the box, may be adapted to the shape of the circuit board, and may be adapted to the shape of the cell supporting structure. The structure of the heat-resistant layer 2 can be attached to the flexible conductive unit 1, and gaps can also be reserved between the heat-resistant layer and the flexible conductive unit 1. This kind can let this circuit protection structure according to the different assembly position of needs adaptation of actual according to the design of predetermined shape solidification shaping, can make the practicality of the technical scheme of this application obtain promoting.

In some embodiments, the circuit protection structure further includes a line pin 3, the line pin 3 includes a metal lead 31 and a lead insulating layer 32, and the metal lead 31 passes through the heat-resistant layer 2 and is electrically connected to the metal layer 10 of the flexible conductive unit 1.

The arrangement of the line pins 3 extending from the metal layer 10 of the flexible conductive element 1 can enrich the possible connection modes of the line. For example, in some embodiments, the line pin 3 may be configured to connect different signal detectors, and the flexible conductive unit 1 may have a bus integrated with multiple signal detector lines. The metal lead 31 of the line pin 3 includes a copper wire, an aluminum wire, etc., and a lead insulating layer 32 is attached to the outside thereof, so that the short circuit problem of the line pin 3 can be prevented. The exterior of the line pin 3 may not be designed with the cured heat-resistant layer 2, so that the wiring of the line pin 3 may have a more flexible manner without being limited by the cured heat-resistant layer 2.

In some embodiments, the heat-resistant layer 2 is formed on the outer layer of the insulating layer 11 in one step.

The specific forming process can be to design a die with the shape of the heat-resistant layer 2 to be manufactured, put the whole flexible circuit board structure into the die, press and solidify the manufacturing material of the heat-resistant layer 2 in the die, and wait for standing to obtain the circuit protection structure of the scheme. Through mould preparation heat-resistant layer 2, can make the preparation of heat-resistant layer 2's shape change standardizedly simultaneously promote the efficiency of circuit protection structure preparation

In other embodiments, referring to fig. 2, the heat-resistant layer 2 may further include a first heat-resistant layer 21 and a second heat-resistant layer 22, the first heat-resistant layer 21 is disposed below the flexible conductive unit 1, and the second heat-resistant layer 22 is disposed above the flexible conductive unit 1.

In the bonding, the first heat-resistant layer 21 and the second heat-resistant layer 22 may have marks of separate molding, such as boundary lines of a separate structure. The specific method for forming the first heat-resistant layer 21 and the second heat-resistant layer 22 may be that a heat-resistant material is selected to be cured to form the first heat-resistant layer 21 disposed below the flexible conductive unit 1, the first heat-resistant layer 21 may be formed by extrusion molding or injection molding, the flexible conductive unit 1 is placed on the first heat-resistant layer 21, and then the heat-resistant material is continuously attached to the flexible conductive unit 1 to be cured, thereby completing the fabrication of the heat-resistant layer 2. The first heat-resistant layer 21 and the second heat-resistant layer 22 may be respectively formed by curing, and the formed first heat-resistant layer 21 and the formed second heat-resistant layer 22 include mutually adaptive components, such as a clamping mechanism and a buckling mechanism, and the mutually adaptive components are used to realize locking and buckling, and wrap the flexible conductive unit 1, so as to achieve the technical effect of forming the heat-resistant layers. The above-mentioned design of the separated heat-resistant layer 2 can meet better assembly requirements, and realize efficient production of the components of the heat-resistant layer 2, especially the technical scheme of casting/injection molding the second heat-resistant layer 22 on the first heat-resistant layer 21, and the second heat-resistant layer 22 part can also be slurry curing molding of the second heat-resistant layer 22 after the first heat-resistant layer 21 and the flexible conductive unit 1 have been installed at specified positions. The adaptability setting capability to different assembly scenes is improved.

With the above-described heat-resistant layer 2 design of the dividable structure, the first heat-resistant layer 21 and the second heat-resistant layer 22 have the same composition.

The same composition can reduce the cost. The composition of the first heat-resistant layer 21 and the second heat-resistant layer 22 may be selected to be different. The material of the first heat-resistant layer 21 and the material of the second heat-resistant layer 22 are selected to be different heat-resistant materials, which can further satisfy the practical requirements of the actual arrangement scene.

In a further embodiment, the heat-resistant layer 2 is made of one or more of silicone, epoxy, polyurethane, PC + ABS, PA, PBT, and PPS. Some of the materials are heat-resistant plastics and some are heat-resistant glue, and different effects can be achieved by selecting the materials according to actual requirements such as the requirements of hardness and viscosity.

In some embodiments, in order to adapt the circuit protection structure of the present application to a scene inside a battery, as shown in fig. 3, the outer surface of the heat-resistant layer 2 further includes at least one inward-recessed notch 23, the notch 23 extends along the length direction, and the shape of the notch 23 is adapted to the shape of the outer wall of the battery. The shape of the heat-resistant layer 2 is matched with the shape of the outer wall of the battery, so that redundant space between adjacent battery monomers 4 in the battery pack can be effectively utilized, and as can be seen from a cross-sectional view, a wiring space still exists at the adjacent part of the battery monomers 4 in the battery pack, and the outer surface of the heat-resistant layer 2 is set to be the shape of the outer wall of the battery monomers 4, so that the space can be effectively utilized. The space utilization rate is improved.

In the embodiment shown in fig. 3, the left and right sides below the heat-resistant layer 2 are respectively provided with a locking groove 23. The clamping grooves 23 are formed on the left side and the right side, so that the lower part of the heat-resistant layer 2 can be better embedded with the batteries on the left side and the right side of the circuit protection structure, namely, the clamping grooves 23 are formed on the left side and the right side, so that the circuit protection structure can be better arranged by utilizing the gaps between the adjacent battery monomers 4 in the battery array,

in other embodiments, the flexible conductive unit 1 is an FFC or an FPC.

FFC flexible flat cable: flexible Flat Cable (FFC) is one kind with PET insulating material and extremely thin tinned Flat copper line, through the novel data Cable that high-tech automation equipment production line pressfitting formed, has advantages such as softness, bending folding at will, thickness are thin, small, connect simple, dismantle convenient, the electromagnetic shield (EMI) of easily solving. Flexible Printed Circuit (FPC), also known as Flexible Printed Circuit (FPC), is favored for its excellent characteristics of light weight, thin thickness, free bending and folding, and both of them are suitable for wiring of internal circuits in the battery operation process. Both require an external design of a heat resistant layer 2 cured to a predetermined shape that protects its normal operation.

The present application further provides a battery, where reference may be made to fig. 3, the battery includes two or more battery cells 4, a sensing unit (not shown in the figure), and a circuit protection structure, the circuit protection structure includes a flexible conductive unit 1 and a heat-resistant layer 2, the battery cells 4 are placed side by side along a first direction, the circuit protection structure is disposed in a gap between adjacent battery cells 4, the flexible conductive unit 1 includes a metal layer 10 and an insulating layer 11 wrapped by the metal layer 10; the heat-resistant layer 2 is solidified and molded on the outer layer of the insulating layer 11 in a preset shape in the extending direction of the flexible conductive unit 1, the metal layer 10 of the flexible conductive unit 1 is electrically connected with the sensing unit in the battery pack, and the first direction is perpendicular to the extending direction of the flexible conductive unit 1.

Through designing the battery of above-mentioned characteristic, its heat-resistant layer 2 cladding is at the skin of flexible conductive element 1, consequently can strengthen flexible conductive element 1's heat resistance, can fight against the overheated state of service environment of each different operating modes in the battery use, has promoted flexible conductive element 1's life. Because heat-resistant layer 2 is set up to predetermine the structure that the shape solidification came out, then heat-resistant layer 2 can also promote the rigidity of whole electrified circuit, protects the inner structure of the heat-resistant layer 2 of solidification, if again when the wiring sets up, whole circuit protection architecture can be got by pressing from both sides, glue and get, modes such as sucking disc absorption are installed or the configuration, can promote the design assembly efficiency and the automation level of whole battery. Still further, the heat-resistant layer 2 is formed by curing according to a predetermined shape, where the predetermined shape may be adapted to the shape of the bottom plate and the corner of the case, may be adapted to the shape of the circuit board, and may be adapted to the shape of the cell supporting structure. This kind can let this circuit protection structure according to the different assembly position of needs adaptation of actual according to the design of predetermined shape solidification shaping, can make the practicality of the technical scheme of this application obtain promoting.

In some embodiments, as shown in fig. 1, the bottom of the heat-resistant layer 2 is shaped to fit the shape of the outer wall of the battery cell 4. This kind of design can let the circuit protection structure assemble with the space between the battery monomer 4 better, has promoted space utilization efficiency, has reduced the whole volume of battery.

In an optional embodiment, the circuit protection structure further includes a line pin 3, and the metal layer 10 is electrically connected to the sensing unit through the line pin 3. The sensing unit is arranged in the battery, so that the running state information of the battery can be fed back in time and acquired by a first hand. The use of the line pins 3 allows for easy connection to the sensing unit at different locations, thus allowing the sensing unit to be designed at any one location. In a specific embodiment, the sensing unit can be configured to include a voltage detection unit and/or a temperature detection unit. The working state of the battery can be better monitored by detecting indexes such as voltage, temperature and humidity in the battery.

The above description is only an example of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application, or which are directly or indirectly applied to other related technical fields, are intended to be included in the scope of the present application.

Claims

1. A circuit protection structure is characterized by comprising a flexible conductive unit and a heat-resistant layer,

2. The circuit protection structure according to claim 1, further comprising a line pin, wherein the line pin comprises a metal lead and a lead insulation layer, and the metal lead is electrically connected with the metal layer of the flexible conductive unit through the heat-resistant layer.

3. The circuit protection structure according to claim 1, wherein said heat-resistant layer is formed by one-step molding on the outer layer of the insulating layer.

4. The circuit protection structure of claim 1, wherein the heat resistant layer comprises a first heat resistant layer disposed below the flexible conductive element and a second heat resistant layer disposed above the flexible conductive element.

5. The circuit protection structure according to claim 4, wherein the first heat-resistant layer and the second heat-resistant layer have the same composition.

6. The circuit protection structure according to claim 4, wherein the first heat-resistant layer and the second heat-resistant layer are different in composition.

7. The circuit protection architecture of claim 1,

8. The circuit protection structure according to claim 7, wherein a card slot is provided on each of left and right sides below the heat-resistant layer.

9. The circuit protection structure of claim 1, wherein the heat-resistant layer is made of one or more of silicone, epoxy, polyurethane, PC + ABS, PA, PBT, and PPS.

10. The circuit protection structure according to claim 1, wherein the flexible conductive unit is an FFC or an FPC.

11. A battery is characterized by comprising more than two battery monomers, a sensing unit and a circuit protection structure, wherein the circuit protection structure comprises a flexible conductive unit and a heat-resistant layer,

12. The battery of claim 11, wherein the bottom of the heat resistant layer is shaped to conform to the shape of the outer cell wall.

13. The battery of claim 11, wherein the circuit protection structure further comprises a wiring pin, and the metal layer is electrically connected to the sensing unit through the wiring pin.

14. The battery according to claim 11, wherein the sensing unit includes a voltage detection unit and/or a temperature detection unit.