Metal sheet integrated precision resistor and battery protection board

Abstract

The utility model relates to a metal sheet integrated precision resistor and a battery protection board. The metal sheet integrated precision resistor comprises a precision resistor body, a first metal sheet and a second metal sheet, the first metal sheet is attached to the first face of the precision resistor body, the first metal sheet and the precision resistor body are electrically connected, and one edge of the second metal sheet is electrically connected with one edge of the first metal sheet. The battery protection plate solves the technical problems that the temperature of the battery protection plate body rises relatively high and the use of the battery protection plate is influenced because the heating value of a large-size precision resistor is relatively large and the heat can only be conducted to the battery protection plate under the condition of large-current flowing.

Description

Technical Field

[0001] This application relates to the field of battery protection boards, and particularly to a metal sheet integrated precision resistor and a battery protection board. Background Art

[0002] Currently, the size of battery protection boards is getting smaller and smaller, and the requirement for device miniaturization is becoming stronger. However, the relative sizes of nickel sheets and precision resistors are relatively large. Using small-sized precision resistors cannot meet the requirements of large current conduction, and using large-sized precision resistors occupies the layout space of the battery protection board, making it impossible to make the battery protection board smaller. Moreover, when a precision resistor conducts a large current, it generates a large amount of heat, and the heat can only be conducted to the battery protection board, resulting in a relatively high temperature rise of the battery protection board itself, which affects the use of the battery protection board. Utility Model Content

[0003] This application provides a metal sheet integrated precision resistor and a battery protection board to solve the technical problem that when a large-sized precision resistor conducts a large current, it generates a large amount of heat, and the heat can only be conducted to the battery protection board, resulting in a relatively high temperature rise of the battery protection board itself, which affects the use of the battery protection board.

[0004] In a first aspect, this application provides a metal sheet integrated precision resistor, including: a precision resistor, a first metal sheet, and a second metal sheet. The first metal sheet is attached to the first surface of the precision resistor, and the two form an electrical connection. One side of the second metal sheet is electrically connected to one side of the first metal sheet.

[0005] As an optional example, the first metal sheet and the second metal sheet are a whole piece of metal sheet that has been bent.

[0006] As an optional example, the area of the first surface of the first metal sheet facing the precision resistor is the same as the area of the first surface of the precision resistor.

[0007] As an optional example, the metal sheet is a nickel sheet.

[0008] As an optional example, the second surface of the precision resistor is soldered to the first pad of the battery protection board, and the second surface of the precision resistor is the opposite surface of the first surface of the precision resistor.

[0009] As an optional example, a gap is opened inside the precision resistor, and a current detection line is included in the gap. One end of the current detection line is connected to the first metal sheet, and the other end of the current detection line is connected to the second pad of the battery protection board.

[0010] As an optional example, the current detection line is composed of a metal coating and an insulating material.

[0011] As an alternative example, the above-mentioned gap is a groove or a hole.

[0012] As an alternative example, the current of the metal sheet integrated precision resistor is detected by detecting the voltage difference between the first pad and the second pad.

[0013] In a second aspect, the present application provides a battery protection board, including the above-mentioned metal sheet integrated precision resistor.

[0014] In the embodiment of the present application, a precision resistor, a first metal sheet, and a second metal sheet are adopted. The first metal sheet is attached to the first surface of the precision resistor, and the two form an electrical connection. One side of the second metal sheet is electrically connected to one side of the first metal sheet to form a metal sheet integrated precision resistor. Since in the metal sheet integrated precision resistor, the metal sheet on the battery protection board is combined with the precision resistor to form an integrated precision resistor, the layout space of the precision resistor can be saved, and at the same time, it is combined with the metal sheet, which is beneficial to the heat dissipation of the precision resistor during large current charging and discharging. Thus, the purpose of meeting both the large size requirement of the precision resistor to achieve large current conduction and the fast charging heat dissipation requirement is realized. Furthermore, the technical problem that when a large size precision resistor conducts large current, it generates a large amount of heat, and the heat can only be conducted to the battery protection board, resulting in a high temperature rise of the battery protection board itself and affecting the use of the battery protection board is solved. Description of the Drawings

[0015] The drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0016] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplary illustrations do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, unless otherwise stated, and the drawings in the drawings do not constitute a proportional limitation.

[0018] Figure 1 is a structural diagram of an alternative metal sheet integrated precision resistor according to an embodiment of the present application;

[0019] Figure 2 is an overall structural diagram of an alternative metal sheet integrated precision resistor according to an embodiment of the present application;

[0020] Figure 3 It is a pad structure diagram of a battery protection board with an integrated precision resistor of a metal sheet according to an embodiment of the present application. Specific implementation manners

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0022] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. To simplify the disclosure of the present application, components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present application. In addition, the present application may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0023] According to the first aspect of the embodiments of the present application, an integrated precision resistor of a metal sheet is provided. Optionally, as Figure 1 shown, the above-mentioned integrated precision resistor of a metal sheet includes:

[0024] A precision resistor 102, a first metal sheet 104, and a second metal sheet 106. The first metal sheet is attached to the first surface of the precision resistor and forms an electrical connection therewith. One side of the second metal sheet is electrically connected to one side of the first metal sheet.

[0025] Optionally, since the size of the current battery protection board is getting smaller and smaller, the requirement for device miniaturization is becoming stronger and stronger. However, the relative sizes of nickel sheets and precision resistors are relatively large. Using small-sized precision resistors cannot meet the large-current conduction requirements, and using large-sized precision resistors occupies the layout space of the battery protection board and cannot make the battery protection board smaller. Moreover, when the precision resistor conducts a large current, the heat generation is relatively large, and the heat can only be conducted to the battery protection board, resulting in a relatively high temperature rise of the battery protection board itself and affecting the use of the battery protection board. Therefore, in this embodiment, the metal sheet on the battery protection board is combined with the precision resistor to form an integrated precision resistor. Specifically, as Figure 2The overall structure diagram of the metal sheet integrated precision resistor shown has a flat surface as the first metal sheet 104 and a vertical surface as the second metal sheet 106. The metal sheet can be a nickel sheet or other metal materials. The first metal sheet 104 is closely attached to the first surface of the precision resistor 102 and has a good electrical connection. One side of the second metal sheet 106 is attached to one side of the first metal sheet 104, that is, the first metal sheet 104 and the second metal sheet 106 are a whole piece of metal sheet after being bent. The first metal sheet 104 and the second metal sheet 106 have good bending performance, which is convenient for the second metal sheet 106 to be bent and attached to the first metal sheet 104 after being connected to the cell tab. The second metal sheet 106 is connected to the cell tab by spot welding. The heat generated by the precision resistor 102 during operation can be dissipated through the cell tab, the battery protection board, and the metal sheet, reducing the rise of the body temperature of the precision resistor. When detecting the current, the voltage difference between the first metal sheet 104 and the second surface of the precision resistor 102, that is, the opposite surface of the first surface of the precision resistor 102, can be detected to detect the current when the precision resistor is operating.

[0026] Optionally, in this embodiment, the first metal sheet and the second metal sheet on the battery protection board are combined with the precision resistor to form an integrated metal sheet integrated precision resistor, which can save the layout space of the precision resistor. At the same time, combined with the metal sheet, it is beneficial for the precision resistor to dissipate heat during large current charging and discharging. Thus, the purpose of meeting both the large size requirements of the precision resistor to achieve large current conduction and the fast charging heat dissipation requirements is realized. Furthermore, the technical problem that when a large-size precision resistor conducts large current, it generates a large amount of heat, and the heat can only be conducted to the battery protection board, resulting in a relatively high temperature rise of the battery protection board itself and affecting the use of the battery protection board is solved.

[0027] As an alternative example, the first metal sheet and the second metal sheet are a whole piece of metal sheet after being bent.

[0028] Optionally, in this embodiment, as Figure 2 shown in the overall structure diagram of the metal sheet integrated precision resistor, the flat surface is the first metal sheet 104, and the vertical surface is the second metal sheet 106. The metal sheet can be a nickel sheet or other metal materials. One side of the second metal sheet 106 is attached to one side of the first metal sheet 104, that is, the first metal sheet 104 and the second metal sheet 106 are a whole piece of metal sheet after being bent. The first metal sheet 104 and the second metal sheet 106 have good bending performance, which is convenient for the second metal sheet 106 to be bent and attached to the first metal sheet 104 after being connected to the cell tab.

[0029] As an alternative example, the area of the first surface of the first metal sheet facing the precision resistor is the same as the area of the first surface of the precision resistor.

[0030] Optionally, in this embodiment, the size of the precision resistor 102 is the same as that of the first metal sheet 104. The size can be designed to be larger than the conventional size, which is more conducive to heat dissipation and has better current-carrying capacity. Thus, the layout area of the battery protection board can be effectively reduced, and the battery protection board can be made smaller.

[0031] As an optional example, the metal sheet is a nickel sheet.

[0032] Optionally, in this embodiment, the metal sheet can be a nickel sheet or can be replaced with other metal materials to be combined with the precision resistor.

[0033] As an optional example, the second side of the precision resistor is soldered on the first pad of the battery protection board, and the second side of the precision resistor is the opposite side of the first side of the precision resistor.

[0034] As an optional example, a gap is formed inside the precision resistor, and a current detection line is included in the gap. One end of the current detection line is connected to the first metal sheet, and the other end of the current detection line is connected to the second pad of the battery protection board.

[0035] Optionally, in this embodiment, as Figure 2 shown in the overall structure diagram of the metal sheet integrated with the precision resistor, and Figure 3 shown in the pad structure diagram of the battery protection board, there are a first pad and a second pad on the battery protection board. The precision resistor is soldered on the first pad of the battery protection board through its second side. The upper layer electrode of the precision resistor 102 is connected to the lower layer through a slot for current detection. When detecting the current, in order to facilitate detecting the voltage difference between the first metal sheet 104 and the second side of the precision resistor 102 on the flat surface, a gap is formed in the precision resistor body and filled with a current detection line, which is connected to the second pad of the lower layer battery protection board, so that one end of the current detection line is connected to the first metal sheet 104, and the other end of the current detection line is connected to the second pad of the battery protection board. The current during the operation of the precision resistor is detected by detecting the voltage difference at both ends of the current detection line.

[0036] As an optional example, the current detection line is composed of a metal coating and an insulating material.

[0037] Optionally, in this embodiment, the current detection line is composed of a metal coating and an insulating material. There is a gap in the precision resistor 102 body and filled with an insulating material, and then connected to the second pad of the lower layer battery protection board through the metal coating.

[0038] As an optional example, the gap is a groove or a hole.

[0039] Optionally, in this embodiment, the upper layer electrode of the precision resistor 102 can be led to the lower layer for current detection by punching holes or other forms.

[0040] Optionally, in this embodiment, as Figure 3The pad structure diagram of the battery protection board shown includes a first pad and a second pad. The first pad is connected to the second side of the precision resistor 102, which is used for large current conduction and can also be used as one end of the current detection line for current detection. The second pad is connected to the other end of the current detection line for current detection at the other end of the current detection line. When detecting the current, to facilitate the detection of the voltage difference between the first metal sheet 104 on the flat surface and the second side of the precision resistor 102, the current detection of the integrated circuit is achieved by detecting the voltage difference between the first pad and the second pad.

[0041] As an alternative example, the current of the metal sheet integrated precision resistor is detected by detecting the voltage difference between the first pad and the second pad.

[0042] Optionally, in this embodiment, as Figure 3 shown in the pad structure diagram of the battery protection board with a metal sheet integrated precision resistor, the first pad is connected to the second side of the precision resistor 102, which is used for large current conduction and can also be used as one end of the current detection line for current detection. The second pad is connected to the other end of the current detection line for current detection at the other end of the current detection line. When detecting the current, to facilitate the detection of the voltage difference between the first metal sheet 104 on the flat surface and the second side of the precision resistor 102, the current detection of the integrated circuit is achieved, and thus, the current detection of the integrated circuit can be achieved by detecting the voltage difference between the first pad and the second pad.

[0043] It should be noted that for the foregoing embodiments of the precision resistor, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that the present application is not limited by the described action sequence, because according to the present application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to the present application.

[0044] According to another aspect of the embodiments of the present application, a battery protection board is further provided, including the metal sheet integrated precision resistor described in any one of the above.

[0045] For other examples of this embodiment, please refer to the above examples and will not be elaborated here.

Claims

1. An integrated precision resistor made of metal sheet, characterized in that, Comprising: A precision resistor, a first metal sheet, and a second metal sheet. The first metal sheet is attached to the first surface of the precision resistor, and the two form an electrical connection. One side of the second metal sheet is electrically connected to one side of the first metal sheet.

2. The metal sheet integrated precision resistor according to claim 1, characterized in that The first metal sheet and the second metal sheet are a single piece of metal sheet that has been bent.

3. The metal sheet integrated precision resistor according to claim 1, characterized in that The area of the first surface of the first metal sheet facing the first surface of the precision resistor is the same as the area of the first surface of the precision resistor.

4. The metal sheet integrated precision resistor according to claim 2, wherein The metal sheet is a nickel sheet.

5. The integrated precision resistor on a metal sheet according to claim 1, characterized in that, The second surface of the precision resistor is soldered to the first pad of the battery protection board. The second surface of the precision resistor is the opposite surface of the first surface of the precision resistor.

6. The precision metal sheet integrated resistor according to claim 5, wherein A gap is formed inside the precision resistor, and a current detection line is included in the gap. One end of the current detection line is connected to the first metal sheet, and the other end of the current detection line is connected to the second pad of the battery protection board.

7. The metal sheet integrated precision resistor according to claim 6, wherein The current detection line is composed of a metal coating and an insulating material.

8. The metal sheet integrated precision resistor according to claim 6, wherein The gap is a groove or a hole.

9. The metal sheet integrated precision resistor according to claim 6, wherein The current of the metal sheet integrated with the precision resistor is detected by detecting the voltage difference between the first pad and the second pad.

10. A battery protection board, characterized in that, The battery protection board includes the metal sheet integrated with the precision resistor according to any one of claims 1 to 9.

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