Battery

Abstract

The utility model discloses a battery and relates to the technical field of energy storage equipment, the battery comprises a battery cell and a heating film attached to one side of the battery cell, one end of the heating film is provided with a bending lug, the bending lug is connected with a temperature protector, and the temperature protector is attached to one side, far away from the heating film, of the battery cell; the temperature protector controls the heating state of the heating film. The bending lugs are arranged, so that the structure is simpler and more compact, the improvement cost is reduced, the temperature protector can be tightly attached to the battery core on the premise of being far away from the heating film, the influence of the heating temperature of the heating film on the temperature protector is reduced, and the control precision and the reliability of the temperature protector are improved. In addition, when the heating film heats the battery cell to the set temperature, the temperature protector is disconnected, and the heating film stops heating, so that the risk of failure of the battery cell caused by too high temperature is prevented, the failure rate can be reduced, and the reliability of the battery is improved. Therefore, the battery designed by the utility model can simultaneously meet the improvement requirements of high reliability and low cost.

Description

Technical Field

[0001] This utility model relates to the field of energy storage equipment technology, and in particular to a battery. Background Technology

[0002] Currently, lithium batteries are widely used in devices such as smartphones, tablets, and electric vehicles due to their advantages such as high energy density, portability, fast charging, and no memory effect. Their performance and lifespan directly affect the device's performance and lifespan.

[0003] At low temperatures, the viscosity of the electrolyte increases, and it may even partially solidify, leading to a decrease in the conductivity of lithium-ion batteries and a slowdown in ion conduction speed, thus affecting the battery's discharge capacity and charging efficiency. Furthermore, the diffusion rate of lithium ions within the active material decreases, and the charge transfer impedance increases significantly, resulting in increased internal resistance and impacting battery performance. The effects of low temperatures on lithium batteries are mainly manifested in changes in electrolyte characteristics, a decrease in chemical reaction rates, and a reduction in usable capacity, significantly affecting the performance of lithium batteries at low temperatures, including decreased energy release capacity, reduced power, and lower actual usable capacity. Therefore, developing lithium batteries adapted to low-temperature environments is particularly necessary to address the impact of low temperatures on lithium battery performance.

[0004] Existing technologies improve the performance of lithium batteries in low-temperature environments by modifying electrolytes, electrode materials, and using solid electrolytes. However, due to limitations of current technology, existing improvement methods cannot simultaneously meet the requirements of high reliability and low cost. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a battery in which an additional heating film is directly attached to the surface of the cell and a temperature protector is set in the heating film to control the surface temperature of the cell by switching it on and off, thus solving the technical problem that existing improvement methods are unable to simultaneously meet the improvement requirements of high reliability and low cost.

[0006] To achieve the above objectives, this utility model provides a battery, including a battery cell and a heating film attached to one side of the battery cell; one end of the heating film is provided with a bending lug, the bending lug is connected to a temperature protector, and the temperature protector is attached to the side of the battery cell away from the heating film; the temperature protector controls the heating state of the heating film.

[0007] Preferably, it also includes a protective plate, and the heating core of the heating film is connected to the protective plate via a wire;

[0008] When the ambient temperature of the battery cell does not reach the set temperature, the temperature protector is in the on state, and the heating element and the battery cell are electrically connected through the protection board, so the heating element heats the battery cell.

[0009] When the surface temperature of the battery cell reaches the set temperature, the temperature protector is in the off state, the heating element remains disconnected from the battery cell, and the heating element stops heating the battery cell.

[0010] Preferably, it also includes a protection board, and the heating core of the heating film is electrically connected to the controller of the protection board via wires;

[0011] When the ambient temperature of the battery cell does not reach the set temperature, the temperature protector is in the on state. The temperature protector feeds back a normal signal to the controller through the wire. After judgment and processing, the controller transmits the generated conduction current to the heating element through the wire to control the heating element to heat the battery cell.

[0012] When the surface temperature of the battery cell reaches the set temperature, the temperature protector is in the off state, the heating element remains disconnected from the battery cell, and the heating element stops heating the battery cell.

[0013] Preferably, the temperature protector includes a body, a fixed terminal, a rocker arm terminal, a thermistor, and a bimetallic strip; the fixed terminal and the rocker arm terminal are respectively inserted into the body from both sides; the thermistor is fixed to one end of the fixed terminal located inside the body; the bimetallic strip is fixed to the thermistor.

[0014] When the thermistor heats the bimetallic strip to the set temperature, the bimetallic strip deforms in the opposite direction due to the heat. The bimetallic strip pushes the moving contact of the rocker arm terminal to separate from the fixed terminal, and the temperature protector remains in the off state.

[0015] When the temperature of the bimetallic strip heated by the thermistor does not reach the set temperature, the bimetallic strip rebounds, and the rocker arm terminal returns to its original position until the moving contact contacts the fixed terminal, and the temperature protector remains on.

[0016] Preferably, the bending ear is integrally disposed at one end of the heating film, and the bending ear bends from the bottom end of the heating film to one side of the battery cell.

[0017] Preferably, the other end of the heating film is integrally provided with a connecting ear, and the connecting ear is provided with a plurality of first solder pads; the protective plate is provided with a plurality of second solder pads; all the first solder pads and all the second solder pads are connected one-to-one by wires; all the first solder pads are distributed in a stepped manner along the length direction of the heating film, and all the second solder pads are distributed linearly along the length direction of the heating film.

[0018] Preferably, the length of the second pad and the length of the conductor core satisfy the following relationship: Lh = Ld, where Lh is the length of the second pad and Ld is the length of the conductor core; the width of the second pad and the width of the conductor core satisfy the following relationship: Wh ≥ Wd, where Wh is the width of the second pad and Wd is the width of the conductor core; along the length direction of the heating film, the distance between two adjacent second pads and the width of the second pad satisfy the following relationship: Sh = Wh, where Sh is the distance between two adjacent second pads and Wh is the width of the second pad.

[0019] Preferably, the protective plate is affixed with several connecting tabs for connecting the battery cells;

[0020] Along the width direction of the heating film, the minimum distance between the second pad and the edge of the protective plate is the set edge distance, which satisfies: D1≥1.5mm, where D1 is the set edge distance;

[0021] Along the width of the heating film, the distance between the second pad and the adjacent connecting piece is a set interval distance, which satisfies: D2≥1.5mm, where D2 is the set interval distance.

[0022] Preferably, the distance between the connecting ear and the protection plate is a preset reserved distance, which satisfies: D3≥15mm, where D3 is the preset reserved distance; and the length of the wire is a preset reserved length, which satisfies: Ld≥15mm, where Ld is the preset reserved length.

[0023] Preferably, along the length of the heating film, the length of the connecting ear satisfies: Lc ≥ 15 mm and Lc = 1 / 2 We, where Lc is the length of the connecting ear and We is the width of the heating film;

[0024] Along the width direction of the heating film, the width of the connecting ear satisfies: Wc≥7mm and Wc=2Dd, where Wc is the width of the connecting ear and Dd is the thickness of the wire.

[0025] Preferably, the angle between the electrode tab and the connecting piece of the battery cell is greater than 45°.

[0026] Preferably, the distance from the temperature protector to the bottom of the battery cell is a preset distance, and the preset distance satisfies: D4≥5mm, where D4 is the preset distance.

[0027] Preferably, the heating film includes a first insulating film and a second insulating film respectively attached and fixed to both sides of the heating core, and the first insulating film and the heating core are bonded together by thermally conductive adhesive.

[0028] Preferably, the heating area of ​​the heating film and the large surface area of ​​the battery cell satisfy the following ratio: Se:Sc = 1:1, where Se is the heating area of ​​the heating film and Sc is the large surface area of ​​the battery cell.

[0029] Preferably, the battery cell includes a first battery cell and a second battery cell arranged adjacent to each other, and a heating film is attached between the first battery cell and the second battery cell; the pit surface of the first battery cell and the pit surface of the second battery cell are opposite to each other.

[0030] Compared to the prior art, this invention directly attaches a heating film to one side of the battery cell, using the heating film to directly heat the cell, enabling the battery to cope with low-temperature environments. The overall battery structure requires minimal modification, resulting in lower costs. In this invention, one end of the heating film has a bent lug connected to a temperature protector. The temperature protector is attached to the side of the battery cell furthest from the heating film, simplifying the structure, reducing costs, and ensuring the temperature protector is close to the cell while remaining away from the heating film. This minimizes the impact of the heating film's temperature on the temperature protector, improving its control accuracy and reliability. Furthermore, when the heating film heats the cell to a set temperature, the temperature protector disconnects, stopping heating and preventing cell failure due to overheating. This also reduces the failure rate and improves battery reliability. Therefore, the battery designed in this invention simultaneously meets the requirements of high reliability and low cost. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0032] Figure 1 A side view of a battery provided in a specific embodiment of this utility model;

[0033] Figure 2 for Figure 1 Exploded view;

[0034] Figure 3 for Figure 2 Side view;

[0035] Figure 4 An isometric view of a battery provided for a specific embodiment of this utility model;

[0036] Figure 5 for Figure 4 A magnified view of part A in the image;

[0037] Figure 6 for Figure 4 The main view;

[0038] Figure 7 for Figure 1 A frontal view of the heating film after it has been unfolded;

[0039] Figure 8 for Figure 7 A magnified view of part B in the image;

[0040] Figure 9 for Figure 1 A schematic diagram of the back side of the heating film after it has been unfolded;

[0041] Figure 10 for Figure 1 A schematic diagram showing the connection of the heating film, wires, and protective plate.

[0042] Figure 11 for Figure 10 A magnified view of a portion of the image;

[0043] Figure 12 for Figure 1 Exploded view of the heating film in the middle;

[0044] Figure 13 for Figure 1 Diagram of the disconnection status of the medium temperature protector;

[0045] Figure 14 for Figure 1 Diagram of the on / off status of the medium temperature protector;

[0046] The attached figures are labeled as follows:

[0047] 1. Battery cell; 2. Heating film; 3. Temperature protector; 4. Protection board; 5. Wires.

[0048] Electrode 10, first battery cell 11, and second battery cell 12;

[0049] Heating element 201, first insulating film 202, and second insulating film 203;

[0050] Bending lug 21, connecting lug 22 and first solder pad 23;

[0051] 31. Body 31, fixed terminal 32, rocker arm terminal 33, thermistor 34 and bimetallic strip 35;

[0052] Second solder pad 41 and connecting piece 42. Detailed Implementation

[0053] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0054] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0055] This utility model discloses a battery, as shown in the attached figure. Figure 1 As shown, it includes a battery cell 1 and a heating film 2. Multiple battery cells 1 are stacked together for storing electrical energy. (See attached diagram.) Figures 1 to 4 As shown, the heating film 2 is directly attached to one side of the battery cell 1. The heating film 2 heats the surface of the battery cell 1, raising the temperature of both the battery cell 1 and its surrounding environment. This enables the battery to cope with low-temperature environments. The overall structure of the battery is only slightly modified, and the modification cost is low.

[0056] As attached Figure 2 and 3 As shown, one end of the heating film 2 is provided with a bent lug 21, and a temperature protector 3 is fixedly mounted on the bent lug 21, so that the temperature protector 3 is attached to the side of the battery cell 1 away from the heating film 2. The temperature protector 3 controls the heating state of the heating film 2 based on the actual temperature of the battery cell 1. The setting of the bent lug 21 eliminates the need for a separate component to fix the temperature protector 3, making the structure simpler and more compact, and reducing the improvement cost. Moreover, the temperature protector 3 is attached to the battery cell 1 while being away from the heating film 2, reducing the impact of the heating temperature of the heating film 2 on the temperature protector 3, improving the control accuracy of the temperature protector 3, and improving reliability.

[0057] The temperature protector 3 controls the heating state of the heating film 2. The temperature protector 3 is preferably a bimetallic strip temperature control switch, which is small in size and possesses high sensitivity and fast response characteristics. Due to its small size, the temperature protector 3 is attached to the large surface area of ​​the battery cell 1, occupying only 5% of the surface area of ​​the large surface area of ​​the battery cell 1, and its volume is 2% of the volume of the battery cell 1. This improves the space utilization of the battery and increases its energy density.

[0058] This invention can both directly heat the battery cell 1 using the heating film 2 and control the heating state of the heating film 2 using the temperature protector 3, thus simultaneously meeting the improvement requirements of high reliability and low cost.

[0059] As a preferred embodiment, as shown in the appendix Figures 1 to 6As shown, the battery also includes a protection board 4, which is located directly above all the battery cells 1. The heating element 201 of the heating film 2 is connected to the protection board 4 via a wire 5.

[0060] When the ambient temperature of battery cell 1 does not reach the set temperature, the temperature protector 3 is in the on state. The heating element 201 is electrically connected to battery cell 1 through the protection board 4. The temperature protector 3 controls the heating element 201 to enter the heating state, transferring the heat generated in a short time to battery cell 1. The heating element 201 heats battery cell 1, and battery cell 1 heats up rapidly, enabling battery cell 1 to achieve normal charging, or even efficient charging, solving the problem that battery cell 1 cannot be charged in low temperature environments.

[0061] When the surface temperature of cell 1 reaches the set temperature, the temperature protector 3 is in the off state, the heating element 201 remains disconnected from cell 1, and the temperature protector 3 controls the heating element 201 to enter the stop heating state. The heating element 201 stops heating cell 1 to prevent cell 1 from failing due to high temperature and improve the reliability of cell 1.

[0062] In another preferred embodiment, the battery also includes a protection board 4, which is located directly above all the battery cells 1. The heating element 201 of the heating film 2 is electrically connected to the controller of the protection board 4 via a wire 5.

[0063] When the ambient temperature of the battery cell 1 does not reach the set temperature, the temperature protector 3 is in the on state. The temperature protector 3 feeds back a normal signal to the controller through the wire 5. After judgment and processing, the controller transmits the generated conduction current to the heating element 201 through the wire 5, controls the heating element 201 to start heating, and transfers the heat generated in a short time to the battery cell 1, heating the battery cell 1. The battery cell 1 heats up rapidly, enabling the battery cell 1 to achieve normal charging, or even efficient charging, solving the problem that the battery cell 1 cannot be charged in a low temperature environment.

[0064] When the surface temperature of cell 1 reaches the set temperature, the temperature protector 3 is in the off state, the heating element 201 remains disconnected from cell 1, the heating element 201 stops heating cell 1, preventing cell 1 from failing due to high temperature and improving the reliability of cell 1.

[0065] It should also be noted that the set temperature mentioned in the article refers to the maximum temperature that cell 1 can withstand, specifically up to 72℃.

[0066] As a preferred embodiment, as shown in the appendix Figure 13 and 14As shown, the temperature protector 3 includes a body 31, a fixed terminal 32, a rocker arm terminal 33, a thermistor 34, and a bimetallic strip 35. The fixed terminal 32 and the rocker arm terminal 33 are respectively inserted into the body 31 from both sides. The thermistor 34 is fixed to one end of the fixed terminal 32 located inside the body 31. The bimetallic strip 35 is fixed to the thermistor 34. The bimetallic strip 35 is made of two metal strips with different coefficients of thermal expansion stacked together.

[0067] When the thermistor 34 heats the bimetallic strip 35 to the set temperature, the bimetallic strip 35 deforms in the opposite direction due to the difference in thermal expansion coefficients. The bimetallic strip 35 pushes the moving contact of the rocker arm terminal 33 to separate from the fixed terminal 32, and the temperature protector 3 remains in the off state. (See attached diagram) Figure 13 As shown;

[0068] When the heating temperature of the bimetallic strip 35 by the thermistor 34 fails to reach the set temperature, the bimetallic strip 35 rebounds, and the rocker arm terminal 33 returns to its original position along with the bimetallic strip 35 until the moving contact of the rocker arm terminal 33 contacts the fixed terminal 32. The temperature protector 3 remains in the ON state. (See attached diagram) Figure 14 As shown.

[0069] As attached Figure 2 and 3 As shown, the bending ear 21 is integrally disposed at one end of the heating film 2. The bending ear 21 bends from the bottom end of the heating film 2 to one side of the battery cell 1. A temperature protector 3 is fixedly installed on the bending ear 21, so that the temperature protector 3 is attached to the side of the battery cell 1 away from the heating film 2. The temperature protector 3 controls the heating state of the heating film 2 based on the actual temperature of the battery cell 1. It should be noted that in the folded state, the bending ear 21 is U-shaped, as shown in the attached figure. Figure 2 and 3 As shown; in the unfolded state, the bending lug 21 is a rectangular frame, that is, a rectangular hole is formed in the center of the bending lug 21, as shown in the attached figure. Figures 7 to 9 As shown, this ensures that the bending lug 21 requires less material, thus reducing costs.

[0070] As attached Figure 2 , 3 As shown in Figures 7 and 9, the other end of the heating film 2 (i.e., the end furthest from the bending ear 21) is integrally provided with a connecting ear 22. The connecting ear 22 has several first solder pads 23, and the protective plate 4 has several second solder pads 41. All the first solder pads 23 and all the second solder pads 41 are connected one-to-one by wires 5. The first solder pads 23 and the wires 5, as well as the second solder pads 41 and the wires 5, are soldered together. To improve the utilization of the space of the connecting ear 22, all the first solder pads 23 are distributed in a stepped manner along the length of the heating film 2, as shown in the attached figure. Figure 12As shown. To maintain an appropriate distance between the conductor 5 and the tab 10 of the cell 1, the second pad 41 is provided along the edge of the protective plate 4, and all the second pads 41 are linearly distributed along the length of the heating film 2, as shown in the attached figure. Figure 10 and 11 As shown, this is to prevent the wire 5 from contacting the tab 10.

[0071] As attached Figure 11 As shown, the length of the second pad 41 and the length of the conductor core 5 satisfy the following relationship: Lh = Ld, where Lh is the length of the second pad 41 and Ld is the length of the conductor core 5; the width of the second pad 41 and the width of the conductor core 5 satisfy the following relationship: Wh ≥ Wd, where Wh is the width of the second pad 41 and Wd is the width of the conductor core 5. This ensures that the second pad 41 has sufficient space to store solder paste, which can completely cover the conductor core 5 and prevent the solder paste from overflowing from the boundary of the second pad 41. This ensures that each conductor 5 is firmly soldered to the protection board 4 and prevents the solder joints of each conductor 5 on the protection board 4 from contacting each other, which could cause signal transmission failure or current short circuit, thus improving the connection reliability between the protection board 4 and the conductor 5.

[0072] Along the length of the heating film 2, the distance between two adjacent second pads 41 and the width of the second pad 41 satisfy the following condition: Sh = Wh, where Sh is the distance between two adjacent second pads 41 and Wh is the width of the second pad 41. This ensures that the spacing between two adjacent second pads 41 is appropriate, avoiding cross-contamination caused by solder paste overflow during soldering due to the small spacing between two adjacent second pads 41. It also reduces the current short-circuit temperature caused by solder paste overflow, lowers the risk of failure at the connection of each wire 5, and improves the reliability of each wire 5.

[0073] As attached Figure 5 As shown, the protection plate 4 is affixed with several connecting pieces 42 for connecting the tabs 10 of the battery cell 1. The connecting pieces 42 are preferably nickel plates, but are not limited thereto. (See attached diagram.) Figure 11 As shown, the minimum distance between the second pad 41 and the edge of the protection board 4 along the width direction of the heating film 2 is the set edge distance. The set edge distance satisfies: D1≥1.5mm, where D1 is the set edge distance, to ensure that the distance between the second pad 41 and the edge of the protection board 4 is appropriate and to prevent the solder paste of the second pad 41 from overflowing outside the protection board 4.

[0074] As attached Figure 11As shown, along the width direction of the heating film 2, the distance between the second pad 41 and the adjacent connecting piece 42 is a set interval distance, which satisfies: D2≥1.5mm, where D2 is the set interval distance; to avoid the solder paste of the second pad 41 overflowing onto the connecting piece 42 due to the small gap between the second pad 41 and the connecting piece 42, which would cause a short circuit between the wire 5 and the electrode 10 of the cell 1, thus improving reliability.

[0075] As attached Figure 10 As shown, the distance between the connecting ear 22 and the protective plate 4 is a preset distance, which satisfies the following condition: D3 ≥ 15mm, where D3 is the preset distance; and, as shown in the attached figure... Figure 9 As shown, the length of conductor 5 is a set reserved length, which satisfies: Ld≥15mm, where Ld is the set reserved length, which provides sufficient bending length for conductor 5, so that the length of conductor 5 is moderate, avoiding the waste of resources caused by excessive length of each conductor 5, and also avoiding the impact of excessive length of conductor 5 on bending.

[0076] As attached Figure 10 As shown, along the length of the heating film 2, the length of the connecting ear 22 satisfies: Lc ≥ 15mm and Lc = 1 / 2We, where Lc is the length of the connecting ear 22 and We is the width of the heating film 2. This ensures that the connecting ear 22 has sufficient space to connect each wire 5, and also ensures that the connecting ear 22 has sufficient strength to support each wire 5. (See attached...) Figure 1 and 10 As shown, along the width direction of the heating film 2, the width of the connecting ear 22 satisfies: Wc≥7mm and Wc=2Dd, where Wc is the width of the connecting ear 22 and Dd is the thickness of the wire 5, thereby improving the reliability and safety of the connection between each wire 5 and the connecting ear 22.

[0077] As attached Figure 5 As shown, the angle between the tab 10 of the battery cell 1 and the connecting piece 42 is greater than 45°, which increases the movement space of each wire 5 between the protection plate 4 and the heating film 2, and improves the connection safety of each wire 5.

[0078] As attached Figure 6 As shown, the temperature protector 3 is located near the bottom of the battery cell 1. The distance between the temperature protector 3 and the bottom of the battery cell 1 is a preset distance. The preset distance satisfies: D4≥5mm, where D4 is the preset distance, preferably 8mm, to provide sufficient bending space for the bending lug 21, ensuring that the bending lug 21 can be tightly attached to the bottom side and large surface of the battery cell 1 after bending, so that the temperature protector 3 is firmly attached to the large surface of the battery cell 1.

[0079] As attached Figure 12As shown, the heating film 2 has a sandwich structure. Besides the heating core 201, it also includes a first insulating film 202 and a second insulating film 203 respectively attached and fixed to both sides of the heating core 201. The first insulating film 202 and the heating core 201, and the second insulating film 203 and the heating core 201 are bonded together with thermally conductive adhesive, giving the heating film 2 good thermal conductivity and electrical insulation properties. The heating core 201 is made of a heating material with good rotational conductivity, such as a nickel alloy. The first insulating film 202 and the second insulating film 203 are preferably polyimide films, which have good electrical insulation and thermal conductivity. Of course, the first insulating film 202 and the heating core 201, and the second insulating film 203 and the heating core 201 can also be fixed together by hot pressing, but this is not a limitation.

[0080] As attached Figure 2 As shown, the heating area of ​​the heating film 2 and the large surface area of ​​the battery cell 1 satisfy the following ratio: Se:Sc = 1:1, where Se is the heating area of ​​the heating film 2 and Sc is the large surface area of ​​the battery cell 1. This ensures that the heating film 2 completely covers the large surface of the battery cell 1, guaranteeing uniform heating of the battery cell 1. Specifically, the large surface of the battery cell 1 refers to the two surfaces with the largest area.

[0081] As attached Figure 2 and 3 As shown, in a preferred embodiment, the heating film 2 is attached and fixed between the large surfaces of the two battery cells 1. The battery cell 1 includes a first battery cell 11 and a second battery cell 12 arranged adjacent to each other. The heating film 2 is attached between the first battery cell 11 and the second battery cell 12. The deep pit surface of the first battery cell 11 is opposite to the horizontal pit surface of the second battery cell 12, so that the first battery cell 11 and the second battery cell 12 are fixedly connected by the heating film 2, and the heating film 2 heats the first battery cell 11 and the second battery cell 12 at the same time. The heat loss is small, the heat utilization rate is high, and it is beneficial to reduce energy consumption.

[0082] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0083] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A battery, characterized in that, It includes a battery cell (1) and a heating film (2) attached to one side of the battery cell (1); one end of the heating film (2) is provided with a bending lug (21), the bending lug (21) is connected to a temperature protector (3), the temperature protector (3) is attached to the side of the battery cell (1) away from the heating film (2); the temperature protector (3) controls the heating state of the heating film (2).

2. The battery according to claim 1, characterized in that, It also includes a protective plate (4), and the heating core (201) of the heating film (2) is connected to the protective plate (4) through a wire (5); When the ambient temperature of the battery cell (1) does not reach the set temperature, the temperature protector (3) is in the on state, the heating element (201) is electrically connected to the battery cell (1) through the protection plate (4), and the heating element (201) heats the battery cell (1). When the surface temperature of the battery cell (1) reaches the set temperature, the temperature protector (3) is in the off state, the heating element (201) remains disconnected from the battery cell (1), and the heating element (201) stops heating the battery cell (1).

3. The battery according to claim 1, characterized in that, It also includes a protection plate (4), and the heating core (201) of the heating film (2) is electrically connected to the controller of the protection plate (4) via a wire (5); When the ambient temperature of the battery cell (1) does not reach the set temperature, the temperature protector (3) is in the on state. The temperature protector (3) feeds back a normal signal to the controller through the wire (5). The controller, after judgment and processing, transmits the generated conduction current to the heating core (201) through the wire (5) to control the heating core (201) to heat the battery cell (1). When the surface temperature of the battery cell (1) reaches the set temperature, the temperature protector (3) is in the off state, the heating element (201) remains disconnected from the battery cell (1), and the heating element (201) stops heating the battery cell (1).

4. The battery according to claim 2 or 3, characterized in that, The temperature protector (3) includes a body (31), a fixed terminal (32), a rocker arm terminal (33), a thermistor (34), and a bimetallic strip (35); the fixed terminal (32) and the rocker arm terminal (33) are respectively inserted into the body (31) from both sides; the thermistor (34) is fixed at one end of the fixed terminal (32) located in the body (31); the bimetallic strip (35) is fixed to the thermistor (34). When the heating temperature of the bimetallic strip (35) by the thermistor (34) reaches the set temperature, the bimetallic strip (35) undergoes reverse deformation due to heat, and the bimetallic strip (35) pushes the moving contact of the rocker arm terminal (33) to separate from the fixed terminal (32), and the temperature protector (3) remains in the disconnected state; When the heating temperature of the bimetallic strip (35) by the thermistor (34) does not reach the set temperature, the bimetallic strip (35) rebounds, and the rocker arm terminal (33) resets with the bimetallic strip (35) until the moving contact contacts the fixed terminal (32), and the temperature protector (3) maintains the on state.

5. The battery according to claim 2 or 3, characterized in that, The bending ear (21) is integrally disposed at one end of the heating film (2), and the bending ear (21) bends from the bottom end of the heating film (2) to one side of the battery cell (1).

6. The battery according to claim 5, characterized in that, The other end of the heating film (2) is integrally provided with a connecting ear (22), and the connecting ear (22) is provided with a plurality of first pads (23); the protective plate (4) is provided with a plurality of second pads (41); all the first pads (23) and all the second pads (41) are connected one-to-one through the wires (5); all the first pads (23) are distributed in a stepped manner along the length direction of the heating film (2), and all the second pads (41) are distributed linearly along the length direction of the heating film (2).

7. The battery according to claim 6, characterized in that, The length of the second pad (41) and the length of the conductor (5) satisfy the following relationship: Lh = Ld, where Lh is the length of the second pad (41) and Ld is the length of the conductor (5); the width of the second pad (41) and the width of the conductor (5) satisfy the following relationship: Wh ≥ Wd, where Wh is the width of the second pad (41) and Wd is the width of the conductor (5); along the length direction of the heating film (2), the distance between two adjacent second pads (41) and the width of the second pad (41) satisfy the following relationship: Sh = Wh, where Sh is the distance between two adjacent second pads (41) and Wh is the width of the second pad (41).

8. The battery according to claim 6, characterized in that, The protective plate (4) is affixed with several connecting pieces (42) for connecting the tabs (10) of the battery cell (1). Along the width direction of the heating film (2), the minimum distance between the second pad (41) and the edge of the protective plate (4) is the set edge distance, which satisfies: D1≥1.5mm, where D1 is the set edge distance; Along the width direction of the heating film (2), the distance between the second pad (41) and the adjacent connecting piece (42) is a set interval distance, which satisfies: D2≥1.5mm, where D2 is the set interval distance.

9. The battery according to claim 6, characterized in that, The distance between the connecting ear (22) and the protection plate (4) is a set reserved distance, which satisfies: D3≥15mm, where D3 is the set reserved distance; and the length of the wire (5) is a set reserved length, which satisfies: Ld≥15mm, where Ld is the set reserved length.

10. The battery according to claim 6, characterized in that, Along the length of the heating film (2), the length of the connecting ear (22) satisfies: Lc≥15mm and Lc=1 / 2We, where Lc is the length of the connecting ear (22) and We is the width of the heating film (2); Along the width direction of the heating film (2), the width of the connecting ear (22) satisfies: Wc≥7mm and Wc=2Dd, where Wc is the width of the connecting ear (22) and Dd is the thickness of the wire (5).

11. The battery according to claim 8, characterized in that, The angle between the tab (10) of the battery cell (1) and the connecting piece (42) is greater than 45°.

12. The battery according to any one of claims 1 to 11, characterized in that, The distance from the temperature protector (3) to the bottom of the battery cell (1) is a set reserved distance, and the set reserved distance satisfies: D4≥5mm, where D4 is the set reserved distance.

13. The battery according to any one of claims 2 to 11, characterized in that, The heating film (2) includes a first insulating film (202) and a second insulating film (203) respectively attached and fixed to both sides of the heating core (201). The first insulating film (202) and the heating core (201) and the second insulating film (203) and the heating core (201) are bonded together by thermally conductive adhesive.

14. The battery according to any one of claims 1 to 11, characterized in that, The heating area of ​​the heating film (2) and the large surface area of ​​the battery cell (1) satisfy the following relationship: Se:Sc = 1:1, where Se is the heating area of ​​the heating film (2) and Sc is the large surface area of ​​the battery cell (1).

15. The battery according to any one of claims 1 to 11, characterized in that, The battery cell (1) includes a first battery cell (11) and a second battery cell (12) arranged adjacent to each other, and the heating film (2) is attached between the first battery cell (11) and the second battery cell (12); the pit surface of the first battery cell (11) and the pit surface of the second battery cell (12) are opposite to each other.

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