Battery protection device and battery

Abstract

The utility model provides a battery protection device and a battery. The battery protection device comprises a first conductor; the first conductor and the second conductor can be in contact conduction and separated disconnection cooperation, and one of the first conductor and the second conductor extends into the roll core and is electrically connected with the roll core; wherein the first conductor comprises a plurality of conducting layers, expansion coefficients of at least two conducting layers are different, and when the first conductor is heated, the first conductor bends and deforms and is separated from the second conductor. The problem that in the prior art, a battery interruption protection device is low in response speed is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery protection device and a battery. BACKGROUND

[0002] Cylindrical batteries are widely used in various electronic devices due to their high energy density and long cycle life. However, during use, the battery may encounter abnormal situations such as overheating or overcurrent, which can cause the battery performance to decline or even cause a safety accident. Some existing battery designs often have the problem of being unable to detect and respond to these abnormal situations in a timely manner, resulting in safety risks, and may not be able to recover after triggering, resulting in permanent failure of the battery, even if the cause of the overheating or overcurrent has been ruled out. This not only reduces the service life of the battery, but also increases the cost of maintenance and replacement. SUMMARY

[0003] The main purpose of the present application is to provide a battery protection device and a battery to solve the problem of slow response speed of the battery interruption protection device in the prior art.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a battery protection device is provided, comprising: a first conductor; a second conductor, the first conductor and the second conductor being cooperatively contactable and separable; one of the first conductor and the second conductor extending into a winding core and electrically connected with the winding core; wherein the first conductor comprises a plurality of conductive layers, and the expansion coefficients of at least two conductive layers are different, and the first conductor is bent and deformed and separated from the second conductor when the first conductor is heated.

[0005] Further, the conductive layer comprises a first conductive layer and a second conductive layer, the first conductive layer and the second conductive layer are stacked, and the expansion coefficients of the first conductive layer and the second conductive layer are different.

[0006] Further, the first conductive layer is farther away from the second conductor than the second conductive layer, and the expansion coefficient of the first conductive layer is smaller than the expansion coefficient of the second conductive layer.

[0007] Further, the first conductor and the second conductor are arranged in parallel, and at least a part of the first conductor is bent in a direction away from the second conductor when the first conductor is heated.

[0008] Further, the second conductor is electrically connected with the winding core, the first conductor is electrically connected with a cover, and the first conductor, the second conductor and the winding core are arranged in sequence.

[0009] Further, the second conductor comprises a first segment and a second segment connected in sequence, the first segment and the second segment are bently connected, the first segment is located in the winding core, and the second segment is located outside the winding core and used to contact and cooperate with the first conductor.

[0010] Further, the battery protection device further comprises an insulating member, which is arranged on the side of the second conductor away from the first conductor and between the second segment and the winding core, and the first segment extends into the winding core through the insulating member.

[0011] Further, one side of the first conductor facing the second conductor is provided with a first contact, and one side of the second conductor facing the first conductor is provided with a second contact, and the first contact and the second contact are in contact when the first conductor and the second conductor are in contact.

[0012] Further, the conductive layer comprises at least three layers, wherein, among all the conductive layers, the expansion coefficient of the conductive layer located in the middle layer is greater than the expansion coefficient of the conductive layers located on both sides; and / or among all the conductive layers, the thickness of the conductive layer located in the middle layer is less than the thickness of the conductive layers located on both sides.

[0013] According to another aspect of the present application, a battery is provided, comprising: a winding core; the battery protection device described above, wherein the second conductor of the battery protection device extends into the winding core and is electrically connected with the winding core.

[0014] By setting the first conductor into a multi-layer structure and the expansion coefficients of the multi-layer conductive layers being not completely the same, the first conductor can quickly respond when the temperature abnormally rises, and the whole bends, so that the first conductor and the second conductor are separated, the battery is quickly disconnected, and the battery is powered off to prevent overheating and safety risks. When the fault is removed and needs to be restored, due to the decrease in temperature, the conductive layer with a low expansion coefficient can drive the conductive layer with a high expansion coefficient to restore to the original state, so that the first conductor can be stably and reliably restored to the position of contacting the second conductor, the battery can be reliably re-powered for use, and the service life is ensured. At the same time, one of the first conductor and the second conductor is arranged to extend into the winding core, so that the first conductor or the second conductor can stably contact the winding core, and other conductive components are not needed between the conductor and the winding core, so as to facilitate the close fit between the winding core and the conductor, reduce the space occupation and the structural complexity, and thus facilitate the miniaturization of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0015] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the specification explain the exemplary embodiments of the present application. The present application is not limited by the inappropriate limitations of the drawings. In the drawings:

[0016] Figure 1 A structure schematic diagram of the battery protection device of the embodiment one of the present application is shown;

[0017] Figure 2 It shows Figure 1 A schematic diagram of the structure when the first and second conductors are in contact and conducting.

[0018] Figure 3 It shows Figure 1 A schematic diagram of the structure of the first and second conductors when they are separated.

[0019] Figure 4 It shows Figure 1 A schematic diagram of the structure of the first conductor in the middle.

[0020] The above figures include the following reference numerals:

[0021] 10. First conductor; 11. First conductive layer; 12. Second conductive layer; 13. First contact; 20. Second conductor; 21. First segment; 22. Second segment; 23. Second contact; 30. Insulating component; 40. Core. Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0024] In this application, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this application.

[0025] To address the problem of slow response speed in existing battery interruption protection devices, this application provides a battery protection device and a battery.

[0026] Example 1

[0027] like Figures 1 to 4 A battery protection device is shown, including a first conductor 10 and a second conductor 20. The first conductor 10 and the second conductor 20 are in contact and can be disconnected. One of the first conductor 10 and the second conductor 20 extends into a winding core 40 and is electrically connected to the winding core 40. The first conductor 10 includes multiple conductive layers, and at least two conductive layers have different coefficients of thermal expansion. When the first conductor 10 is heated, the first conductor 10 bends and deforms and separates from the second conductor 20.

[0028] The first conductor 10 is arranged in a multi-layer structure, and the expansion coefficients of the multi-layer conductive layers are not completely the same, so that the first conductor 10 can quickly respond when the temperature abnormally rises, and the whole bends, so that the first conductor 10 is separated from the second conductor 20, the battery is quickly disconnected to cut off the power supply, and the battery is prevented from overheating to avoid safety risks. When the fault is removed and needs to be restored, the conductive layer with a low expansion coefficient can drive the conductive layer with a high expansion coefficient to restore to the original state due to the decrease in temperature, so that the first conductor 10 can be stably and reliably restored to the position of contacting the second conductor 20, the battery can be reliably re-powered for use, and the service life is ensured. At the same time, one of the first conductor 10 and the second conductor 20 is arranged to extend into the winding core 40, so that the first conductor 10 or the second conductor 20 can stably contact and conduct with the winding core 40. In this way, no other conductive components are needed between the conductor and the winding core 40, so as to facilitate the close fit between the winding core 40 and the conductor, reduce the space occupation and the structural complexity, and thus facilitate the miniaturization of the battery.

[0029] As shown in Figure 4 , the conductive layer is provided with two layers, specifically, the conductive layer includes a first conductive layer 11 and a second conductive layer 12, the first conductive layer 11 and the second conductive layer 12 are stacked, and the expansion coefficients of the first conductive layer 11 and the second conductive layer 12 are not the same. The structure of two layers can meet the use requirements of general batteries. Of course, according to different actual requirements, the number of conductive layers can be increased as needed, and three, four or more layers can be set.

[0030] As shown in Figure 1 , in the embodiment, the first conductive layer 11 is farther away from the second conductor 20 than the second conductive layer 12, and the expansion coefficient of the first conductive layer 11 is smaller than that of the second conductive layer 12. In this way, when the temperature rises, the second conductive layer 12 can drive the first conductive layer 11 to deform faster and more, so that the second conductive layer 12 can generate sufficient bending force, so that the first conductor 10 deforms as soon as possible, realizes the quick response of the first conductor 10, and separates the first conductor 10 from the second conductor 20 quickly, thereby realizing the quick response of the battery, reducing the response time, and improving the reaction speed.

[0031] The first conductor 10 and the second conductor 20 of the embodiment are both in sheet structure, the first conductive layer 11 and the second conductive layer 12 are both in sheet structure, the first conductive layer 11 and the second conductive layer 12 are arranged in stack and contact, the first conductor 10 and the second conductor 20 are arranged in parallel, and the first conductor 10 and the second conductor 20 are arranged in interval except the contact part. When the first conductor 10 is heated, at least a part of the first conductor 10 is bent away from the second conductor 20, so that the first conductor 10 and the second conductor 20 are immediately separated. The above arrangement makes the first conductor 10 and the second conductor 20 cooperate more closely, which is beneficial to reduce the occupied space and the size of the battery. On the other hand, the first conductor 10 can be separated from the second conductor 20 by a slight deformation, which further improves the response speed.

[0032] As shown in Figure 2 and Figure 3 The first conductor 10 is provided with the first contact 13 on the side facing the second conductor 20, and the second conductor 20 is provided with the second contact 23 on the side facing the first conductor 10. That is, the first contact 13 and the second contact 23 are arranged on the surfaces of the first conductor 10 and the second conductor 20 facing each other. When the first conductor 10 and the second conductor 20 are in contact, the first contact 13 and the second contact 23 are in contact to realize the contact between the first conductor 10 and the second conductor 20. The other parts of the first conductor 10 and the second conductor 20 can be arranged in interval and do not need to be in contact, so that the first conductor 10 and the second conductor 20 can be separated by the contact between the first contact 13 and the second contact 23 when the first conductor 10 is bent.

[0033] Optionally, the number and shape of the first contact 13 and the second contact 23 can be set as required. The first contact 13 and the second contact 23 of the embodiment are both spherical and are provided with three respectively. The three first contacts 13 and the second contacts 23 are in contact respectively, which is helpful to the separation of the contacts and improves the response speed.

[0034] As shown in Figure 1As shown, the first conductor 10 and the second conductor 20 of the embodiment are both arranged on the top of the winding core 40, and the second conductor 20 is electrically connected with the winding core 40, and the first conductor 10 is electrically connected with the cap, and the cap, the first conductor 10, the second conductor 20 and the winding core 40 are arranged in sequence from top to bottom. In this way, in combination with the arrangement form of the aforementioned sheet structure, the thickness direction of the first conductor 10 and the second conductor 20 is the height direction of the battery, so that the first conductor 10 and the second conductor 20 only occupy a small distance in the height direction, and the length direction and the width direction of the first conductor 10 and the second conductor 20 are within the range of the winding core 40, so that the first conductor 10 and the second conductor 20 can be directly electrically connected with the cap and the winding core 40, and the space occupation is reduced.

[0035] As Figure 1 shown, in the embodiment, since the second conductor 20 needs to cooperate with the winding core 40, the second conductor 20 of the embodiment adopts a bent structure design. Specifically, the second conductor 20 includes a first segment 21 and a second segment 22 connected in sequence, and the first segment 21 is bently connected with the second segment 22. In the embodiment, an included angle of about 90 degrees is formed between the first segment 21 and the second segment 22, so that the second conductor 20 forms an L-shaped structure. The first segment 21 extends longitudinally and extends into the winding core 40, so as to realize reliable electrical connection with the winding core 40. The second segment 22 is located outside the top of the winding core 40, and the second segment 22 is arranged in parallel with the first conductor 10. In this way, the first segment 21 realizes connection with the winding core 40, and the second segment 22 realizes contact and conduction cooperation with the first conductor 10. The above arrangement enables the second conductor 20 to realize cooperation with the first conductor 10 and the winding core 40, and simplifies the structural complexity of the second conductor 20.

[0036] In the embodiment, the first contact 13 is arranged on the end side of the first conductor 10 away from the cap, and the second contact 23 is arranged on the end side of the second segment 22 away from the first segment 21, that is, the first contact 13 and the second contact 23 are respectively located at positions of the first conductor 10 and the second conductor 20 away from the cap and the winding core 40, so that the first contact 13 and the second contact 23 are located at free ends. In this way, the connection position of the first conductor 10 and the cap and the first contact 13 are respectively located at two ends of the length of the first conductor 10, and the first segment 21 and the second contact 23 are respectively located at two ends of the second segment 22. In this way, when the first conductor 10 deforms, the first contact 13 can be more quickly separated from the second contact 23, so as to improve the response speed.

[0037] As Figure 1As shown, in the present embodiment, considering that the position between the second conductor 20 and the winding core 40 is relatively close, the battery protection device of the present embodiment further comprises an insulating member 30, which is arranged on the side of the second conductor 20 away from the first conductor 10 and between the second section 22 and the winding core 40, so that the second section 22 and the winding core 40 are insulated and separated by the insulating member 30, thereby avoiding accidental leakage and the like. Since the first section 21 needs to extend into the winding core 40, the present embodiment further comprises a via hole on the insulating member 30, which penetrates through both sides of the insulating member 30, so that the first section 21 can extend into the winding core 40 through the via hole and the insulating member 30. The insulating member 30 of the present embodiment is an insulating film, and of course, other insulating components can also be used as the insulating member 30.

[0038] The present embodiment further provides a battery, which comprises a shell, a winding core 40 and the above-mentioned battery protection device, the second conductor 20 of the battery protection device extends into the winding core 40 and is electrically connected with the winding core 40, and the battery protection device, the winding core 40, the cap and other components are arranged in the shell.

[0039] Embodiment Two

[0040] The difference between the present embodiment and the first embodiment is that the structure of the first conductor 10 is different.

[0041] In the present embodiment, the conductive layer not only comprises two layers, but also can comprise more layers, i.e., the conductive layer comprises at least three layers, and the structure of more layers is beneficial to improve the reliability of the cooperation between the first conductor 10 and the second conductor 20, and is also beneficial to improve the structural strength of the first conductor 10.

[0042] Preferably, among all the conductive layers, the expansion coefficient of the conductive layer located in the middle layer is greater than the expansion coefficient of the conductive layers located on both sides; and / or among all the conductive layers, the thickness of the conductive layer located in the middle layer is less than the thickness of the conductive layers located on both sides. The present embodiment takes the conductive layer as an example which is provided with three layers, namely, the first layer, the second layer and the third layer, wherein the first layer is farther away from the second conductor 20 than the third layer, so that the third layer serves as the layer closest to the second conductor 20, and the first contact 13 is arranged at the outer surface of the third layer. The expansion coefficient of the second layer is greater than the expansion coefficients of the first layer and the third layer, and the thickness of the second layer is less than the thicknesses of the first layer and the third layer. In this way, the second layer is thin and easy to deform, so that the second layer can deform the fastest at high temperature, thereby driving the first layer and the third layer to bend together to realize the fastest separation from the second conductor 20, and when recovering, the first layer and the third layer can drive the second layer to recover to the original shape as soon as possible, so that the first conductor 10 can recover to the original state as much as possible, ensuring the reliability of the contact and cooperation between the first conductor 10 and the second conductor 20 after recovery, and the above-mentioned arrangement can also ensure the reliability of the contact and cooperation between the first conductor 10 and the second conductor 20 during normal operation.

[0043] Of course, the thickness and expansion coefficient of the above-mentioned middle layer can also be adjusted as needed, and the specific number of layers of the conductive layer can also be further increased. When the conductive layer has four or more layers, the middle layer is preferably the middlemost layer or two layers, and of course can also be other layers except the outermost layers. The conductive layers located on both sides are preferably the outermost two layers, and of course can also be the layers adjacent to the above-mentioned middle layer.

[0044] It should be noted that the arrangement mode of the three layers and more layers in the present embodiment does not conflict with the arrangement mode of the double layers in the first embodiment. The arrangement mode of the first conductive layer 11 and the second conductive layer 12 in the first embodiment can be used in at least two of the three layers in the present embodiment.

[0045] It should be noted that the plurality of in the above-mentioned embodiments means at least two.

[0046] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects:

[0047] 1. The problem of slow response speed of the battery interruption protection device in the prior art is solved;

[0048] 2. The battery is quickly disconnected to avoid safety risks;

[0049] 3. The battery can be reliably re-energized for use, avoiding the situation that cannot be recovered, and ensuring the service life;

[0050] 4. The application is beneficial to realize the close cooperation between the winding core and the conductor, reduce the space occupation and the complexity of structure, thereby beneficial to reduce the size of the battery, realize the miniaturization of the battery.

[0051] Obviously, the above described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0052] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, work, device, component and / or combination thereof.

[0053] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0054] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various changes and modifications to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A battery protection device, characterized by, The battery protection device comprises: a first conductor (10); a second conductor (20), the first conductor (10) and the second conductor (20) being in contact and disconnection cooperation, one of the first conductor (10) and the second conductor (20) extending into a winding core (40) and being electrically connected with the winding core (40); wherein the first conductor (10) comprises a plurality of conductive layers, and the expansion coefficients of at least two of the conductive layers are different, the first conductor (10) being bent and deformed when heated and being separated from the second conductor (20).

2. The battery protection apparatus of claim 1, wherein The conductive layers comprise a first conductive layer (11) and a second conductive layer (12), the first conductive layer (11) and the second conductive layer (12) being stacked, and the expansion coefficients of the first conductive layer (11) and the second conductive layer (12) being different.

3. The battery protection apparatus of claim 2, wherein The first conductive layer (11) is farther away from the second conductor (20) than the second conductive layer (12), and the expansion coefficient of the first conductive layer (11) is smaller than that of the second conductive layer (12).

4. The battery protection apparatus of claim 1, wherein The first conductor (10) and the second conductor (20) are arranged in parallel, and at least a part of the first conductor (10) is bent away from the second conductor (20) when heated.

5. The battery protection apparatus of claim 1, wherein The second conductor (20) is electrically connected with the winding core (40), the first conductor (10) is electrically connected with a cap, and the first conductor (10), the second conductor (20) and the winding core (40) are arranged in sequence.

6. The battery protection apparatus of claim 5, wherein The second conductor (20) comprises a first segment (21) and a second segment (22) connected in sequence, the first segment (21) and the second segment (22) are bent and connected, the first segment (21) is located in the winding core (40), and the second segment (22) is located outside the winding core (40) and is used for contact cooperation with the first conductor (10).

7. The battery protection apparatus of claim 6, wherein The battery protection device further comprises an insulating member (30), the insulating member (30) is arranged on a side of the second conductor (20) away from the first conductor (10) and between the second segment (22) and the winding core (40), and the first segment (21) extends into the winding core (40) through the insulating member (30).

8. The battery protection apparatus of claim 1, wherein One side of the first conductor (10) facing the second conductor (20) is provided with a first contact (13), one side of the second conductor (20) facing the first conductor (10) is provided with a second contact (23), and the first contact (13) and the second contact (23) are in contact when the first conductor (10) and the second conductor (20) are in contact and conductive.

9. The battery protection apparatus of claim 1, wherein The conductive layers comprise at least three layers, wherein, in all the conductive layers, the expansion coefficient of the conductive layer located in the middle layer is greater than that of the conductive layers located on both sides; and / or in all the conductive layers, the thickness of the conductive layer located in the middle layer is less than that of the conductive layers located on both sides.

10. A battery, characterized by The battery protection device comprises: a winding core (40); The battery protection device according to any one of claims 1 to 9, wherein a second conductor (20) of the battery protection device extends into the jelly-roll (40) and is electrically connected to the jelly-roll (40).

Images