Self-heating battery and battery pack

Abstract

The utility model relates to a self-heating battery and a battery pack. The battery comprises a shell, a battery core and a heating assembly, wherein the battery core and the heating assembly are both arranged in the shell, and the heating assembly is arranged in the battery core; the heating assembly comprises a connecting piece, a heating body, a switch and an insulating base body, the heating body is respectively connected with a positive lug and a negative lug of the battery cell through the connecting piece, the connecting piece, the heating body, the switch and the battery cell form a series loop, and the insulating base body wraps the heating body. By arranging the internal heating assembly, the battery and the battery pack have a self-heating function, the core body can provide a power supply for the heating belt, no extra power supply is needed for the heating belt, the heating efficiency is high, rapid temperature rise can be achieved, and control is convenient; meanwhile, the heating body is prevented from being extruded and punctured by sharp protrusions, and the nonmetal insulating base body can effectively prevent the heating body from being corroded by electrolyte.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a self-heating battery pack and a battery. BACKGROUND

[0002] As an indispensable power supply device in our daily life, the working principle of the battery mainly depends on the internal chemical reaction. These chemical reactions generate a potential difference between the positive and negative electrodes of the battery, thereby realizing the storage and release of energy. However, the rate of these chemical reactions is not constant, and it is affected by many factors, among which temperature is a key factor. In a low-temperature environment, the chemical reaction rate inside the battery will decrease significantly. This is because low temperature slows down the movement speed of molecules and ions, thereby reducing the activity level of chemical reactions. This slowed chemical reaction rate will cause the internal resistance of the battery to increase, which means that the battery needs to overcome greater resistance when discharging, thereby causing the discharge power to decrease. The decrease in discharge power not only affects the use experience of the battery, but also may cause the device to malfunction. In addition, low temperature also affects the discharge capacity of the battery. Due to the decrease in chemical reaction rate, the amount of electricity that the battery can release during discharge will also decrease. This is undoubtedly a great challenge for devices that need to use the battery for a long time.

[0003] In order to solve the problem of battery performance degradation in low-temperature environment, the traditional technology usually sets a heating sheet on the outside of the battery to increase the temperature of the battery through external heating. However, this heating method has certain limitations. First, the heating rate of the heating sheet is slow, and it takes a long time for the battery to reach a suitable working temperature. Second, this heating method may increase the volume and weight of the battery, affecting the portability of the device. CONTENT OF THE INVENTION

[0004] Therefore, it is necessary to provide a self-heating battery and battery pack which are convenient to use and have high heating efficiency in view of the above technical problems.

[0005] A self-heating battery, comprising: a shell, a battery core and a heating assembly; wherein the battery core and the heating assembly are both arranged in the shell, and the heating assembly is arranged in the battery core; the heating assembly comprises a connecting sheet, a heating body, a switch and an insulating base body, the heating body is connected with the positive and negative electrode ears of the battery core through the connecting sheet respectively, the connecting sheet, the heating body, the switch and the battery core constitute a series circuit, and the insulating base body wraps the heating body.

[0006] In one embodiment, the connecting sheet comprises a first connecting sheet connected with the positive electrode ear and a second connecting sheet connected with the negative electrode ear, the first connecting sheet is an aluminum sheet or an aluminum alloy sheet, and the second connecting sheet is a copper sheet or a copper alloy sheet.

[0007] In one of the embodiments, the first connecting sheet has a thickness of 0.01-0.4mm, or the second connecting sheet has a thickness of 0.01-0.4mm.

[0008] In one of the embodiments, the connecting sheet further comprises an embedded part protruding from the edge of the connecting sheet to extend into the insulating base and connect with the heating body.

[0009] In one of the embodiments, the insulating base has a thickness of 0.05-0.4mm, or the total thickness of the insulating base containing the heating body is 0.1-0.4mm.

[0010] In one of the embodiments, the switch is arranged on the heating body and wrapped in the insulating base, the switch is arranged at the edge of the insulating base, or the switch is arranged between the adjacent connecting sheets.

[0011] In one of the embodiments, the battery core comprises a core body, the core body comprises positive and negative sheets, the positive and negative sheets are arranged in cross-stacking manner, and the heating assembly is arranged between the positive and negative sheets.

[0012] In one of the embodiments, the battery core comprises a core body, the battery core comprises positive and negative sheets, the positive and negative sheets are arranged in cross-winding manner, the heating assembly is arranged at the initial end of the winding of the positive and negative sheets, and the heating assembly is wrapped in the center of the core body.

[0013] In one of the embodiments, the battery core comprises at least two groups of the core bodies, and a heating assembly is arranged between two adjacent core bodies.

[0014] A self-heating battery pack comprising the self-heating battery described above.

[0015] The battery and the battery pack described above have the self-heating function by arranging the internal heating assembly. The two ends of the heating body are connected with the positive and negative poles of the core body. When the heating assembly needs to work, the core body itself can provide power for the heating belt, without the need of providing power for the heating belt additionally, so as to realize the self-heating of the battery, the high heating efficiency, the rapid heating, and the convenient control. Meanwhile, the heating body is arranged in the insulating base, so as to avoid the extrusion and piercing of the core body by the sharp protrusion of the heating body. The non-metallic insulating base can also effectively avoid the corrosion of the heating body by the electrolyte. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 FIG. 1 is a structural schematic diagram of the battery according to an embodiment of the present application.

[0017] Figure 2A structural schematic diagram of a battery according to another embodiment of the present application.

[0018] Figure 3 A structural schematic diagram of a heating assembly according to a first embodiment of the present application.

[0019] Figure 4 A structural schematic diagram of a heating assembly according to a second embodiment of the present application.

[0020] Figure 5 A structural schematic diagram of a heating assembly according to a third embodiment of the present application.

[0021] Figure 6 A structural schematic diagram of a core and a heating assembly according to an embodiment of the present application.

[0022] BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 1. battery; 10, battery core; 11, core; 100, heating assembly; 110, connecting piece; 111, first connecting piece; 112, second connecting piece; 120, heating body; 130, insulating base; 140, switch; 200, positive electrode piece; 300, diaphragm; 400, negative electrode piece. DETAILED DESCRIPTION

[0024] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific embodiments described and it is therefore contemplated to cover all such modifications as fall within the scope of the application. It is to be understood that the specific embodiments of the present application are shown by way of illustration and not as limitations.

[0025] In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0026] In addition, the terms "first", "second", and the like, if any, are used herein for descriptive purposes only and should not be construed as indicating or implying relative importance or implicating the number of indicated technical features. Thus, a feature defined with "first" or "second" can include at least one of the features explicitly or implicitly. In the description of the present application, the term "plurality" means at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0027] In the present application, unless otherwise explicitly specified and limited, if the terms "mounting", "connecting", "connecting", "fixing" and the like appear, these terms should be interpreted broadly. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] In the present application, unless otherwise explicitly specified and limited, if the first feature is described as "on" or "under" the second feature, etc., it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be the first feature directly above or obliquely above the second feature, or it can only mean that the first feature is higher than the second feature in horizontal height. The first feature "below", "below" and "below" the second feature can be the first feature directly below or obliquely below the second feature, or it can only mean that the first feature is lower than the second feature in horizontal height.

[0029] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are only for illustrative purposes and do not represent the only implementation.

[0030] Reference is made to Figures 1-6 , Figures 1-6The structure diagram of a battery in an embodiment of the present application is shown. The self-heating battery provided by the embodiment of the present application comprises a shell, a battery core 10 and a heating assembly 100, wherein the battery core 10 and the heating assembly 100 are arranged in the shell, and the heating assembly 100 is arranged in the battery core 10. The heating assembly 100 comprises a connecting sheet 110, a heating body 120, a switch 140 and an insulating base 130. The heating body 120 is connected with the positive and negative electrode tabs of the battery core 10 through the connecting sheet 110. The connecting sheet 110, the heating body 120 and the switch 140 form a series loop with the battery core 10. The heating body 120 is arranged in the insulating base 130.

[0031] The battery and the battery pack described above have the self-heating function by arranging the heating assembly 100 inside. The two ends of the heating body 120 are connected with the positive and negative electrodes of the battery core 10. When the heating assembly 100 needs to work, the battery core 10 can provide power for the heating body 120, without the need to additionally provide power for the heating body 120. The battery is self-heated, the heating efficiency is high, the temperature can be quickly raised, and the control is convenient. Meanwhile, the heating body 120 is arranged in the insulating base 130. The insulating base 130 is made of non-metal material. The insulating base 130 can insulate and protect the heating body 120, and avoid the situation that the heating body 120 has sharp protrusions to press and pierce the battery core 10. The non-metal insulating base 130 can also effectively avoid the corrosion of the heating body 120 by the electrolyte.

[0032] The battery core 10 comprises a core body 11. The core body 11 comprises a positive electrode tab 200 and a negative electrode tab 400. The core body 11 is mainly placed by winding (one end of the whole electrode tab is fixed, and the other end is wound in one direction with the one end as the center) or stacking (the stacking width is set, and the reciprocating folding is performed based on the stacking width to realize the stacking of the electrode tab) of the electrode tabs (the positive electrode tab 200 and the negative electrode tab 400). A diaphragm 300 is usually arranged between the positive electrode tab 200 and the negative electrode tab 400. The part of the positive electrode tab 200 and the negative electrode tab 400 with active material constitutes the electrode tab body of the battery core assembly. The part of the positive electrode tab 200 and the negative electrode tab 400 without active material respectively constitutes the electrode tab. The positive electrode tab and the negative electrode tab can be located at one end of the electrode tab body or at two ends of the electrode tab body respectively. In the charging and discharging process of the battery 1, the positive active material and the negative active material react with the electrolyte, and the electrode tabs are connected with the electrode terminals to form a current loop.

[0033] In one of the embodiments, as shown in Figure 1 The positive electrode tab 200 and the negative electrode tab 400 are cross-stacked, and the heating assembly 100 is arranged between the positive electrode tab 200 and the negative electrode tab 400. Further, the heating assembly 100 is arranged between the positive electrode tab 200 and the diaphragm 300, or the heating assembly 100 is arranged between the negative electrode tab 400 and the diaphragm 300.

[0034] Or, in one embodiment, as shown in Figure 2 The positive electrode sheet 200 and the negative electrode sheet 400 are cross-wound, and the heating assembly 100 is arranged at the initial end of the winding of the positive electrode sheet 200 and the negative electrode sheet 400, and the heating assembly 100 is wrapped in the center of the core 11. Specifically, after the positive and negative electrode sheets 400 are cross-stacked, they are wound from one end, and the heating assembly 100 is attached to or connected to the end of the battery core 10, and the battery core 10 is wound outside the heating assembly 100, so that the heating strip is wrapped in the winding core.

[0035] In one embodiment, the battery core 10 includes at least two groups of cores 11, and a heating assembly 100 can also be arranged between adjacent cores 11. The positive electrode sheet 200 and the negative electrode sheet 400 in each core 11 can be arranged in any of the above winding and stacking manners, and the electrode sheets in the cores 11 in the same battery core 10 can be arranged in different or the same manner. Specifically, at least one heating assembly 100 is provided, and one heating assembly 100 is arranged in each core 11 to be arranged between the electrode sheets in the single core 11, and / or Figure 6 as shown, one heating assembly 100 is arranged between adjacent cores 11.

[0036] The battery 1 also includes a shell and an end cover assembly, and the positive electrode sheet 200, the negative electrode sheet 400, and the electrolyte are contained in the shell, and the end cover assembly covers the opening of the shell to isolate the internal environment of the battery 1 from the external environment. The shell can contain one or more positive electrode sheets 200 and negative electrode sheets 400. In this application, the battery 1 can include a lithium ion battery, a sodium ion battery, or a magnesium ion battery, etc., and the embodiments of this application are not limited thereto. The battery 1 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc., and the corresponding shell is in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto. The battery 1 is generally divided into three types according to the packaging method: cylindrical battery monomer, square battery monomer, and soft package battery monomer, and the embodiments of this application are not limited thereto.

[0037] Generally, the positive electrode tab is made of aluminum or aluminum alloy, and the negative electrode tab is made of copper or copper alloy, such as copper plated with nickel. In one embodiment, the connecting sheet 110 includes a first connecting sheet 111 connected to the positive electrode tab and a second connecting sheet 112 connected to the negative electrode tab. Corresponding to the material of the electrode tab, the first connecting sheet 111 is an aluminum sheet or an aluminum alloy sheet, and the second connecting sheet 112 is a copper sheet or a copper alloy sheet.

[0038] The connecting piece 110 is connected with the tab on the adapter piece to realize the connection of the two, and the connection mode can be welding. The first connecting piece 111 is welded with the positive tab on the positive adapter piece, and the second connecting piece 112 is welded with the negative tab on the negative adapter piece.

[0039] In one embodiment, the thickness of the first connecting piece 111 is 0.01-0.4mm, or the thickness of the second connecting piece 112 is 0.01-0.4mm. Preferably, the thickness of the first connecting piece 111 is 0.01-0.2mm, and the thickness of the second connecting piece 112 is 0.01-0.2mm. The shape, length and width of the first connecting piece 111 and the shape, length and width of the second connecting piece 112 are consistent with the shape, length and width of the positive tab and the negative tab, respectively.

[0040] In one embodiment, the connecting piece 110 further comprises an embedded part, which is protruding from the edge of the connecting piece 110 to extend into the insulating base 130 to connect with the heating body 120. The connecting piece 110 is in the shape of "convex", L or "cross", etc. The embedded part is integrally arranged with the connecting piece 110, and the embedded part is a structure protruding from the edge of the connecting piece 110. The protruding part extends into the insulating base 130, and the protruding embedded part is connected with a part of the heating body 120. When the heating body 120 in the insulating base 130 is connected with the connecting piece 110, a hole needs to be opened on the insulating base 130, and the embedded part is arranged so that the heating body 120 is away from the hole on the insulating base 130. The embedded part extends into the insulating base 130, which can avoid the corrosion of the electrolyte when the heating body 120 is connected with the connecting piece 110 and extends out of the insulating base 130.

[0041] In one embodiment, the heating body 120 is a nickel strip, and the length of the heating body 120 is greater than the width or length of the insulating base 130, so that the heating body 120 is arranged in the insulating base 130 in a bent shape. The heating assembly 100 composed of a nickel strip can heat the battery cell according to the set power. Compared with external heating, the heating rate from the back can be faster, the temperature rise is relatively uniform, the battery cell can be quickly heated in an ultra-low temperature environment, the battery cell can reach the best activation state, and the battery cell can start to work. According to the test, the heating assembly 100 composed of a nickel strip with a certain size can heat the battery cell to 20-30℃ in an ultra-low temperature environment of-40-0℃ with a heating power of 1-500W.

[0042] In one embodiment, the insulating base 130 is made of flexible plastic material or is a film-shaped plastic material. Preferably, the insulating base 130 is a PP film or a silica gel sheet. The film-shaped or sheet-shaped plastic material can effectively wrap the heating element 120, has a smooth surface, avoids extrusion or puncture of the battery core 10 by sharp protrusions, and can protect the heating element 120 in the liquid battery from corrosion by electrolyte. In addition, the heating assembly 100 formed by the insulating base 130 of the above material is easier to install in the battery core 10, occupies less space, and is convenient to assemble.

[0043] In one embodiment, the thickness of the insulating base 130 is 0.05-0.4 mm, or the total thickness of the insulating base 130 containing the heating element 120 (i.e., the total thickness of the heating assembly 100) is 0.1-0.4 mm. The heating assembly 100 occupies less space, is beneficial to assembly in a smaller battery pack without increasing the overall size of the battery, and realizes the miniaturization design of the self-heating battery.

[0044] In one embodiment, the switch 140 is connected to the heating element 120 and is used to control the start and stop of the heating element 120. The switch 140 is arranged on the heating element 120 and is wrapped in the insulating base 130. The switch 140 is arranged between adjacent connection sheets 110.

[0045] When the switch 140 is closed, the circuit formed by the positive tab, the first connection sheet 111, the heating assembly 100, the second connection sheet 112, the negative tab, and the battery core 10 is conducted, and the current flows out of the positive tab, flows through the heating assembly 100, and then flows into the negative tab. When the current flows through the heating assembly 100, the heating assembly 100 releases heat to heat the battery 1 inside the battery 1. When the switch 140 is opened, the circuit formed by the positive tab, the first connection sheet 111, the heating assembly 100, the second connection sheet 112, the negative tab, and the battery core 10 is cut off, and no current flows through the heating assembly 100. At this time, the heating assembly 100 stops releasing heat.

[0046] The switch 140 is arranged in the heating element 120, and the heating element 120 is divided into a section connected between the first connection sheet 111 and the switch 140 and a section connected between the second connection sheet 112 and the switch 140. Preferably, the switch 140 is a wireless remote control switch 140, which can realize its closing and opening by receiving a remotely transmitted signal.

[0047] Specifically, as shown in FIG. 6, the switch 140 is arranged in the heating element 120, and the heating element 120 is divided into a section connected between the first connection sheet 111 and the switch 140 and a section connected between the second connection sheet 112 and the switch 140. Figures 3-5As shown, when the switch 140 is arranged at the edge of the insulating base 130, the switch 140 is arranged at the edge of the side of the insulating base 130 away from the connecting piece 110, the switch 140 can be arranged at the middle of the connecting line between the adjacent connecting pieces 110, and the switch 140 is arranged at the middle of the heating body 120, the distance between the first connecting piece 111 and the switch 140 and the distance between the second connecting piece 112 and the switch 140 are equal.

[0048] When the switch 140 is arranged at the edge of the insulating base 130, the switch 140 is arranged at the edge of the side of the insulating base 130 close to one of the first connecting piece 111 and the second connecting piece 112, and the switch 140 is closer to one of the connecting pieces 110, further, in the width direction, the switch 140 can protrude relative to the position of the connecting piece 110, and the insulating base 130 also includes a part protruding and wrapping the switch 140.

[0049] When the switch 140 is arranged between the adjacent connecting pieces 110, the first connecting piece 111, the switch 140 and the second connecting piece 112 are arranged side by side in the width direction, the distance between the first connecting piece 111 and the switch 140 and the distance between the second connecting piece 112 and the switch 140 are equal, at this time, the switch 140 is arranged protruding, and the switch 140 and the part of the insulating base 130 wrapping the switch 140 are exposed from the electrolyte.

[0050] The battery monomer involved in the embodiments of the present application can be used in, but is not limited to, an electric device such as a vehicle, a ship or an aircraft. A power supply system composed of the battery monomer and the battery involved in the present application can be used in the electric device.

[0051] The electric device using the battery as a power supply in the embodiments of the present application can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft and the like. The electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy and an electric plane toy and the like, and the spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft and the like.

[0052] It should be understood that the technical solutions described in the embodiments of the present application are not only limited to the above-described batteries and electric devices, but can also be applied to all batteries including a box body and electric devices using the batteries, but for the sake of simplicity, the following embodiments are described by taking an electric vehicle as an example.

[0053] Any combination of the technical features in the above-described embodiments can be made, and for the sake of brevity, not all possible combinations are described, however, it is to be understood that the application embraces all such possible combinations.

[0054] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that for ordinary skilled persons in the art, some modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A self-heating battery, characterized in that The battery comprises a shell, a battery core and a heating assembly; wherein the battery core and the heating assembly are both arranged in the shell, and the heating assembly is arranged in the battery core; the heating assembly comprises a connecting sheet, a heating body, a switch and an insulating base body, the heating body is connected with the positive and negative tabs of the battery core through the connecting sheet respectively, the connecting sheet, the heating body, the switch and the battery core constitute a series circuit, and the heating body is arranged by being wrapped by the insulating base body.

2. The self-heating battery according to claim 1, characterized in that The connecting sheet comprises a first connecting sheet connected with the positive tab and a second connecting sheet connected with the negative tab, the first connecting sheet is an aluminum sheet or an aluminum alloy sheet, and the second connecting sheet is a copper sheet or a copper alloy sheet.

3. The self-heating battery according to claim 2, characterized in that The thickness of the first connecting sheet is 0.01-0.4 mm, or the thickness of the second connecting sheet is 0.01-0.4 mm.

4. The self-heating battery of claim 1, wherein, The connecting sheet further comprises an embedded part, the embedded part is protruded from the edge of the connecting sheet to extend into the insulating base body and be connected with the heating body.

5. The self-heating battery of claim 1, wherein, The thickness of the insulating base body is 0.05-0.4 mm, or the total thickness of the insulating base body containing the heating body is 0.1-0.4 mm.

6. The self-heating battery of claim 1, wherein, The switch is arranged on the heating body and wrapped in the insulating base body, the switch is arranged at the edge of the insulating base body, or the switch is arranged between adjacent connecting sheets.

7. The self-heating battery of claim 1, wherein, The battery core comprises a core body, the core body comprises positive and negative sheets, the positive and negative sheets are arranged in cross-stacking mode, and the heating assembly is arranged between the positive and negative sheets.

8. The self-heating battery of claim 1, wherein, The battery core comprises a core body, the battery core comprises positive and negative sheets, the positive and negative sheets are arranged in cross-winding mode, the heating assembly is arranged at the initial end of the winding of the positive and negative sheets, and the heating assembly is wrapped in the center of the core body.

9. The self-heating battery according to claim 7 or 8, characterized in that The battery core comprises at least two groups of core bodies, and a heating assembly is arranged between adjacent two core bodies. 10.A self-heating battery pack comprising the self-heating battery according to any one of claims 1 to 9.

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