Battery and electronic equipment

Abstract

The utility model provides a battery and electronic equipment. The battery comprises a battery cell, a circuit board and a thermal fusing device electrically connected with the battery cell and the circuit board. The thermal fusing device comprises a shell, a conducting strip, a thermistor, a first conducting piece and a second conducting piece. When the thermal fusing device is in a safety protection state, the first conductive piece and the second conductive piece are electrically connected through the thermistor and the conductive sheet; when the thermal fusing device is in a contact breaking state, the first conductive piece and the second conductive piece are disconnected, and the thermistor and the first conductive piece are disconnected. The thickness direction of the battery cell is defined as a first direction, the direction from the thermistor to the second conductive piece is defined as a second direction, the thermistor is disconnected with the first conductive piece when moving in the second direction under the action of external force, and the included angle between the second direction and the first direction is larger than 0 degree and smaller than or equal to 180 degrees. The probability of contact breaking of the thermal fusing device is reduced, so that the probability of abnormal shutdown of the electronic equipment is reduced.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery and an electronic device. Background Art

[0002] Electronic devices are generally equipped with batteries, which include thermal cutoff devices. When an electronic device is subjected to a drop test or accidentally falls during use, there is a risk that the thermal cutoff device may be triggered to disconnect, causing the electronic device to shut down abnormally. Therefore, effectively reducing this risk has become an important part of electronic device design. Utility Model Content

[0003] The present application provides a battery and an electronic device, which can reduce the probability of a thermal fuse device of the battery being disconnected when the electronic device accidentally falls.

[0004] The present application provides a battery, comprising:

[0005] Battery cells;

[0006] Circuit boards;

[0007] A thermal fuse device electrically connects the battery cell and the circuit board, the thermal fuse device comprises a shell, a first conductive member and a second conductive member at least partially located in the shell, and a thermistor and a conductive sheet located in the shell, the first conductive member is electrically connected to the battery cell, the second conductive member is electrically connected to the circuit board, when the thermal fuse device is in a safety protection state, the first conductive member and the second conductive member are electrically connected through the thermistor and the conductive sheet; when the thermal fuse device is in a disconnected state, the first conductive member is disconnected from the second conductive member and the thermistor is disconnected from the first conductive member, the thickness direction of the battery cell is defined as a first direction, the direction from the thermistor to the second conductive member is defined as a second direction, the thermistor is disconnected from the first conductive member when it moves along the second direction under the action of an external force, and the angle between the second direction and the first direction is greater than 0 degree and less than or equal to 180 degrees.

[0008] Furthermore, the second direction is perpendicular to the first direction.

[0009] Furthermore, the thermal fuse device is adhered and fixed on the battery core.

[0010] Further, the circuit board is located outside the battery cell, the battery cell includes a side surface, the side surface extends along the first direction, and the thermal fuse device is fixed on the side surface.

[0011] Further, the battery cell includes a positive electrode tab and a negative electrode tab, the positive electrode tab includes a first connecting portion and a first contact portion connected to the first connecting portion, the first connecting portion is connected to the battery cell, the first conductive member is electrically connected to the first contact portion, the negative electrode tab is electrically connected to the circuit board, and the first contact portion is parallel to the side surface.

[0012] Further, the battery includes a third conductive member, which connects the second conductive member and the circuit board, and the third conductive member includes a second connecting portion and a second contact portion connected to the second connecting portion, the second conductive member is electrically connected to the second contact portion, the second connecting portion is electrically connected to the circuit board, and the second contact portion is parallel to the side surface.

[0013] Furthermore, the thermal fuse device is placed obliquely relative to the first direction.

[0014] Further, the battery cell includes a positive electrode tab and a negative electrode tab, the positive electrode tab includes a first connecting portion and a first contact portion connected to the first connecting portion, the first connecting portion is connected to the battery cell, the battery cell includes a side surface extending along the first direction, the first contact portion is inclined relative to the side surface, the first conductive member is electrically connected to the first contact portion, and the negative electrode tab is electrically connected to the circuit board.

[0015] Further, the battery includes a third conductive member, which connects the second conductive member and the circuit board, and the third conductive member includes a second connecting portion and a second contact portion connected to the second connecting portion, the second conductive member is electrically connected to the second contact portion, the second connecting portion is electrically connected to the circuit board, and the second contact portion is arranged obliquely relative to the side surface.

[0016] Further, the first conductive member is welded and fixed to the first contact portion, and / or the second conductive member is welded and fixed to the second contact portion, and / or the second connecting portion is welded and fixed to the circuit board, and / or the negative electrode tab is welded and fixed to the circuit board.

[0017] An embodiment of the present application further provides an electronic device, comprising the above-mentioned battery.

[0018] The battery of the embodiment of the present application includes a battery cell and a thermal fuse device, the thermal fuse device includes a thermistor and a first conductive member, the thickness direction of the battery cell is defined as the first direction, the thermistor is disconnected from the first conductive member when moving along the second direction, so that the thermal fuse device is in a disconnected state, and since the electronic device generally falls along the first direction, the angle between the second direction and the first direction of the present application is greater than 0 degrees and less than or equal to 180 degrees, when the electronic device falls along the first direction, the probability of disconnection of the thermal fuse device is reduced, the probability of disconnection of the thermal fuse device caused by accidental falling of the electronic device is reduced, and the probability of accidental abnormal shutdown of the electronic device is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of a battery according to an embodiment of the present application;

[0020] Figure 2 yes Figure 1 An exploded view of the battery shown;

[0021] Figure 3 yes Figure 2 A schematic diagram of a thermal cutoff device for a battery shown;

[0022] Figure 4 yes Figure 3 A cross-sectional schematic diagram of the thermal cutout device shown;

[0023] Figure 5 yes Figure 4 The cross-sectional schematic diagram of the thermal cutoff device shown is in the disconnected state;

[0024] Figure 6 yes Figure 1 The schematic diagram of the battery shown here is to eliminate the Mylar sheet;

[0025] Figure 7 yes Figure 6 An enlarged view of the circled portion at A of the schematic diagram shown;

[0026] Figure 8 yes Figure 1 A schematic diagram showing electrical connection between a battery cell and a circuit board;

[0027] Fig. 9 yes Figure 8 An enlarged view of the circled portion at B of the schematic diagram shown;

[0028] Fig.10 yes Figure 1 A schematic diagram of another embodiment of the battery shown, wherein the Mylar sheet is not shown;

[0029] Fig.11 yes Fig.10 An enlarged view of the circled portion at C of the schematic diagram shown;

[0030] Fig.12 yes Fig.10 A side view of the battery cell, circuit board and thermal cutoff device electrical connection shown;

[0031] Fig.13 yes Fig.12 An enlarged view of the circled portion at D of the side view shown;

[0032] Fig.14 yes Fig.10 A schematic diagram of a battery shown, wherein the thermal fuse device is not shown;

[0033] Fig.15 yes Fig.14 An enlarged view of the circled portion at E of the schematic diagram shown;

[0034] Fig.16 yes Fig.14 An enlarged view of the circled portion at F of the schematic diagram shown;

[0035] Fig.17 yes Fig.10 A schematic diagram showing electrical connection between a battery cell and a circuit board;

[0036] Fig.18 yes Fig.17 An enlarged view of the circled portion at G in the schematic diagram shown. DETAILED DESCRIPTION

[0037] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of devices consistent with some aspects of the present application as detailed in the appended claims.

[0038] The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The words "first", "second" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantitative limit, but indicate that there is at least one. "Multiple" or "several" means two or more. Unless otherwise specified, words such as "front", "rear", "lower" and / or "upper" are only for the convenience of explanation and are not limited to one position or one spatial orientation. Words such as "include" or "comprise" mean that the elements or objects appearing in front of "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, and can include electrical connections, whether direct or indirect. The singular forms "a", "said" and "the" used in this specification and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0039] The battery of the embodiment of the present application can be applied to electronic devices, including but not limited to laptop computers, mobile phones, tablets, cameras, wearable devices, etc.

[0040] See also Figure 1 to Figure 2 The battery 100 includes a battery cell 1, a circuit board 2, a thermal fuse device 3, a frame 4 and a Mylar sheet 5.

[0041] The battery cell 1 is electrically connected to the circuit board 2, and the thermal fuse device 3 is electrically connected to the battery cell 1 and the circuit board 2. The Mylar sheet 5 is wrapped around the frame 4, the battery cell 1 and the circuit board 2 to fix the battery cell 1, the circuit board 2 and the frame 4.

[0042] In some implementations, the frame 4 and the Mylar sheet 5 may not be provided, and the battery cell 1 may be glued and fixed on the housing of the electronic device.

[0043] Mylar sheet 5 is widely used in wrapping various motors, electronic components, batteries, etc., and plays a fixing role. One or more Mylar sheets 5 can be provided according to actual needs, and the present application does not limit the number of Mylar sheets 5.

[0044] The thermal cutoff (TCO) 3 acts as an "automatic switch" in the circuit, providing over-temperature and over-current protection.

[0045] The frame 4 is made of insulating material and includes a main frame 41 and a fixing plate 42 extending from the main frame 41. The battery cell 1 is accommodated in a space surrounded by the main frame 41. The circuit board 2 is fixed on the fixing plate 42.

[0046] See also Figure 3 to Figure 4 The thermal fuse device 3 includes a housing 31, a first conductive member 32, a second conductive member 33, a thermistor 34 and a conductive sheet 35 located inside the housing 31. At least part of the first conductive member 32 extends out of the housing 31 to be electrically connected to the battery cell 1; at least part of the second conductive member 33 extends out of the housing 31 to be electrically connected to the circuit board 2.

[0047] The first conductive member 32 includes a base 321 and a first tail 322 connected to the base 321. The base 321 is located inside the housing 31. A first contact 323 and a second contact 324 are provided on the base 321. The first tail 322 is located outside the housing 31 to be electrically connected to the battery cell 1.

[0048] The second conductive member 33 includes a second tail portion 331 and a cantilever 332 connected to the second tail portion 331. The cantilever 332 can be elastically deformed when subjected to force. The cantilever 332 is located inside the housing 31. The second tail portion 331 is located outside the housing 31 to be electrically connected to the circuit board 2. The cantilever 332, the conductive sheet 35, the thermistor 34 and the base 321 are arranged in sequence. Under normal conditions, the conductive sheet 35 is in an arc shape protruding toward the cantilever 332, the free end of the cantilever 332 is in contact with the second contact 324, the conductive sheet 35 is disconnected from the cantilever 332, and the thermistor 34 is in contact with the first contact 323 and the conductive sheet 35. At this time, the current flows in the following order: the second conductive member 33, the first conductive member 32.

[0049] When the conductive sheet 35 heats up to a value exceeding a threshold, the thermal fuse device 3 is in a safety protection state, the conductive sheet 35 is deformed in the reverse direction to present an arc shape protruding toward the base 321, and the edge of the conductive sheet 35 abuts against the cantilever 332, so that the free end of the cantilever 332 is disconnected from the second contact 324. At this time, the thermal fuse device 3 is in a non-disconnection state, the first conductive member 32 is electrically connected to the second conductive member 33 through the thermistor 34 and the conductive sheet 35, and the current flows in the following order: the second conductive member 33, the conductive sheet 35, the thermistor 34 and the first conductive member 32.

[0050] In some embodiments, the conductive sheet 35 is a bimetallic conductive sheet.

[0051] See also Figure 5 Under the impact of external force, when the free end of the cantilever 332 is disconnected from the second contact 324 and the thermistor 34 is disconnected from the first contact 323, the thermal fuse device 3 is in a disconnected state, the current cannot pass, and the electronic device will shut down.

[0052] See also Figures 4 to 5 The direction from the thermistor 34 to the second conductive member 33 is defined as the second direction (X direction). When the thermistor 34 moves along the second direction under the action of an external force, it is disconnected from the first conductive member 32, and the conductive sheet 35 returns to its original state. The thermal fuse device 3 may be disconnected instantly for protection. Figure 6 , the thickness direction of the battery cell 1 is defined as the first direction (Y direction), and the angle between the second direction and the first direction is greater than 0 degrees and less than or equal to 180 degrees. Since the electronic device generally falls along the first direction, the angle between the second direction and the first direction is greater than 0 degrees and less than or equal to 180 degrees. When the electronic device falls along the first direction, the probability of the thermistor 34 being disconnected from the first conductive member 32 is reduced, that is, the probability of the thermal fuse device 3 being disconnected is reduced, and the probability of the electronic device accidentally falling or accidentally shutting down due to disconnection during a drop test is reduced.

[0053] In some embodiments, the external force is the force of gravity when dropped.

[0054] See also Figure 6 , Optionally, the second direction is perpendicular to the first direction. At this time, the thermal fuse device 3 can be glued and fixed on the battery core 1, for example, it can be glued and fixed on the battery core 1 by adhesive.

[0055] Optionally, the circuit board 2 is located outside the battery cell 1. The battery cell 1 includes a side surface 11, and the side surface 11 extends along the first direction. Optionally, the thermal fuse device 3 is fixed on the side surface 11, for example, by adhesive bonding.

[0056] See also Figures 7 to 9The battery cell 1 includes a positive electrode tab 12 and a negative electrode tab 13. The positive electrode tab 12 includes a first connecting portion 121 and a first contact portion 122 connected to the first connecting portion 121. The first connecting portion 121 is connected to the battery cell 1, and the first contact portion 122 is parallel to the side surface 11, and at least part of the first connecting portion 121 is perpendicular to the side surface 11, or it may not be perpendicular. The first conductive member 32 is electrically connected to the first contact portion 122, and the negative electrode tab 13 is electrically connected to the circuit board 2.

[0057] Optionally, the battery cell 1 includes a main body 14 and a protrusion 15 protruding from one end of the main body 14. The thermal fuse device 3 is located in a space enclosed by the protrusion 15 and the side surface 11. The thickness of the protrusion 15 is less than the thickness of the main body 14. The side surface 11 is disposed on the main body 14, and the protrusion 15 extends from the side surface 11 and is perpendicular to the side surface 11.

[0058] Optionally, the first connecting portion 121 and the negative electrode tab 13 are both connected to the protruding portion 15 .

[0059] Optionally, the negative electrode tab 13 is fixed to the first gasket 21 on the circuit board 2 by welding.

[0060] Optionally, the first tail portion 322 of the first conductive member 32 is fixed to the first contact portion 122 by welding, for example, by electric welding.

[0061] See also Figure 2 and Figure 7 The battery 100 includes a third conductive member 6. The third conductive member 6 connects the second conductive member 33 and the circuit board 2. The third conductive member 6 includes a second connecting portion 61 and a second contact portion 62 connected to the second connecting portion 61. The second conductive member 33 is electrically connected to the second contact portion 62, the second connecting portion 61 is electrically connected to the circuit board 2, the second contact portion 62 is parallel to the side surface 11, and at least part of the second connecting portion 61 is perpendicular to the side surface 11, or it may not be perpendicular.

[0062] In some embodiments, the third conductive member 6 may be a nickel sheet.

[0063] Optionally, the second tail portion 331 of the second conductive member 33 is fixed to the second contact portion 62 by welding.

[0064] Optionally, the second connecting portion 61 is fixed to the second gasket 22 on the circuit board 2 by welding.

[0065] Optionally, the third conductive member 6 is fixed on the battery cell 1 , and the third conductive member 6 and the battery cell 1 may not be fixed.

[0066] See also Figures 10 to 13 In another embodiment, the thermal fuse device 3 is placed at an angle relative to the first direction. Optionally, the thermal fuse device 3 is placed at an angle of 45 degrees relative to the first direction.

[0067] See also Figures 14 to 18 In another embodiment, the difference between the first conductive member 32 and the second conductive member 33 is that the first contact portion 122 and the second contact portion 62 are both inclined relative to the side surface 11 instead of being parallel to the side surface 11 .

[0068] When assembling the battery 100 of the embodiment of the present application, the thermal fuse device 3 is first welded to the battery cell 1 and the circuit board 2, and the battery cell 1 is welded to the circuit board 2, and then the welded battery cell 1, the thermal fuse device 3 and the circuit board 2 are placed in the frame 4, and the periphery is glued and wrapped with Mylar sheet 5. When the battery 100 is used in an electronic device, it is fixed to the electronic device by locking it with the frame 4, for example, it can be fixed by screws.

[0069] The above is only a preferred implementation mode of the present application, and does not constitute any form of limitation to the present application. Although the present application has been disclosed as a preferred implementation mode as above, it is not used to limit the present application. Any technician familiar with this profession can make some changes or modify the technical contents disclosed above into equivalent implementation modes without departing from the scope of the technical solution of the present application. However, any simple modification, equivalent change and modification made to the above implementation modes based on the technical essence of the present application without departing from the content of the technical solution of the present application still fall within the scope of the technical solution of the present application.

Claims

1. A battery, characterized in that: include: Battery cells; Circuit boards; A thermal fuse device electrically connects the battery cell and the circuit board, the thermal fuse device comprises a shell, a first conductive member and a second conductive member at least partially located in the shell, and a thermistor and a conductive sheet located in the shell, the first conductive member is electrically connected to the battery cell, the second conductive member is electrically connected to the circuit board, when the thermal fuse device is in a safety protection state, the first conductive member and the second conductive member are electrically connected through the thermistor and the conductive sheet; when the thermal fuse device is in a disconnected state, the first conductive member is disconnected from the second conductive member and the thermistor is disconnected from the first conductive member, the thickness direction of the battery cell is defined as a first direction, the direction from the thermistor to the second conductive member is defined as a second direction, the thermistor is disconnected from the first conductive member when it moves along the second direction under the action of an external force, and the angle between the second direction and the first direction is greater than 0 degree and less than or equal to 180 degrees.

2. The battery according to claim 1, characterized in that The second direction is perpendicular to the first direction.

3. The battery according to claim 2, characterized in that The thermal fuse device is adhered and fixed on the battery core.

4. The battery according to claim 2, characterized in that The circuit board is located outside the battery core. The battery core includes a side surface, the side surface extends along the first direction, and the thermal fuse device is fixed on the side surface.

5. The battery according to claim 4, characterized in that The battery cell includes a positive electrode tab and a negative electrode tab, the positive electrode tab includes a first connecting portion and a first contact portion connected to the first connecting portion, the first connecting portion is connected to the battery cell, the first conductive member is electrically connected to the first contact portion, the negative electrode tab is electrically connected to the circuit board, and the first contact portion is parallel to the side surface.

6. The battery according to claim 5, characterized in that The battery includes a third conductive member, which connects the second conductive member and the circuit board. The third conductive member includes a second connecting portion and a second contact portion connected to the second connecting portion. The second conductive member is electrically connected to the second contact portion. The second connecting portion is electrically connected to the circuit board. The second contact portion is parallel to the side surface.

7. The battery according to claim 1, characterized in that The thermal fuse device is placed obliquely relative to the first direction.

8. The battery according to claim 7, characterized in that The battery cell includes a positive electrode tab and a negative electrode tab, the positive electrode tab includes a first connecting portion and a first contact portion connected to the first connecting portion, the first connecting portion is connected to the battery cell, the battery cell includes a side surface extending along the first direction, the first contact portion is inclined relative to the side surface, the first conductive member is electrically connected to the first contact portion, and the negative electrode tab is electrically connected to the circuit board.

9. The battery according to claim 8, characterized in that The battery includes a third conductive member, which connects the second conductive member and the circuit board. The third conductive member includes a second connecting portion and a second contact portion connected to the second connecting portion. The second conductive member is electrically connected to the second contact portion. The second connecting portion is electrically connected to the circuit board. The second contact portion is arranged obliquely relative to the side surface.

10. The battery according to claim 6 or 9, characterized in that: The first conductive member is welded and fixed to the first contact portion, and / or the second conductive member is welded and fixed to the second contact portion, and / or the second connecting portion is welded and fixed to the circuit board, and / or the negative electrode tab is welded and fixed to the circuit board.

11. An electronic device, characterized in that: Comprising the battery according to any one of claims 1 to 10.

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