Structure of low-internal-resistance lithium battery protection switch and lithium ion battery

Abstract

The utility model provides a structure of a low-internal-resistance lithium battery protection switch and a lithium ion battery, the structure of the low-internal-resistance lithium battery protection switch comprises a battery cell and a protection switch assembly, and one end of the battery cell is provided with a containing groove and a pole piece connecting end; the protection switch assembly comprises a first nickel-plated copper sheet, a second nickel-plated copper sheet, a protection switch body, a first connecting copper sheet and a second connecting copper sheet, the two sides of the protection switch assembly are connected to the first connecting copper sheet and the second connecting copper sheet respectively and located in the containing groove, and the first nickel-plated copper sheet is connected to the first connecting copper sheet; the second nickel-plated copper sheet is connected to the second connecting copper sheet, and the first nickel-plated copper sheet is connected with the pole piece connecting end of the battery cell. The first nickel-plated copper sheet is connected with the pole piece connecting end of the battery cell, and the second nickel-plated copper sheet is used for being connected with a charging source or a discharging source, so that the protection switch assembly is compact in structure; the resistance of the first nickel-plated copper sheet and the second nickel-plated copper sheet is relatively low, so that the internal resistance of the structure of the low-internal-resistance lithium battery protection switch is relatively low.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of lithium ion batteries, in particular to a structure of a low-internal-resistance lithium battery protection switch and a lithium ion battery. BACKGROUND

[0002] With the rapid development of the new energy industry and the continuous progress of battery technology, the safety performance of lithium ion batteries is increasingly valued. When the battery appears abnormal conditions such as over-temperature and over-current, safety hazards are prone to occur.

[0003] A battery protection switch is welded on the lithium ion battery, and when the battery appears abnormal conditions such as over-temperature and over-current, the battery protection switch can cut off the circuit, thereby avoiding safety hazards of the lithium ion battery. However, when the battery and the battery protection switch are connected by pure nickel sheets, the internal resistance of the pure nickel sheets is high, resulting in large current loss in the circuit.

[0004] As disclosed in the prior art document CN201821808259.9, a current overload protection type battery connecting piece includes a first nickel sheet, a second nickel sheet and a temperature control switch connected to each other. The temperature control switch includes a first end portion and a second end portion arranged opposite to each other. The first nickel sheet is connected to the first end portion, and the second nickel sheet is connected to the second end portion. The first nickel sheet is parallel to the second nickel sheet. The first nickel sheet and the second nickel sheet are both provided with aramid 1313 fiber tape at the connection positions of the first nickel sheet and the first end portion and the second nickel sheet and the second end portion. This scheme ensures the electrical conductivity and also plays a role in current overload protection, and meets the insulation requirements of the connecting piece and the connecting component. However, the internal resistance of the first nickel sheet and the second nickel sheet in this scheme is large, resulting in large current loss in the circuit. Utility model content

[0005] The purpose of the present disclosure is to overcome the deficiencies in the prior art and provide a low-internal-resistance lithium battery protection switch with a compact protection switch assembly structure and low internal resistance, and a lithium ion battery.

[0006] The purpose of the present disclosure is achieved by the following technical solutions:

[0007] A structure of a low-internal-resistance lithium battery protection switch includes a battery cell and a protection switch assembly. One end of the battery cell is provided with a receiving groove, and the battery cell is provided with a tab connecting end.

[0008] The protection switch assembly comprises a first nickel-plated copper sheet, a second nickel-plated copper sheet, a protection switch body, a first connecting copper sheet and a second connecting copper sheet, the protection switch body is connected with the first connecting copper sheet and the second connecting copper sheet respectively on two sides, the first connecting copper sheet, the second connecting copper sheet and the protection switch body are located in the accommodating groove, the first nickel-plated copper sheet is connected with the first connecting copper sheet, the second nickel-plated copper sheet is connected with the second connecting copper sheet, the first nickel-plated copper sheet is connected with the pole connecting end of the battery cell, and the second nickel-plated copper sheet is used for being connected with a charging source or a discharging source.

[0009] In one of the embodiments, a bending part is arranged at one end of the protection switch body adjacent to the first connecting copper sheet, so that the first connecting copper sheet is close to the pole connecting end of the battery cell.

[0010] In one of the embodiments, the first nickel-plated copper sheet and the second nickel-plated copper sheet are arranged in parallel.

[0011] In one of the embodiments, the first nickel-plated copper sheet and the first connecting copper sheet are welded integrally, and the second nickel-plated copper sheet and the second connecting copper sheet are welded integrally.

[0012] In one of the embodiments, a plurality of welding points are arranged between the first nickel-plated copper sheet and the first connecting copper sheet, and a plurality of welding points are arranged between the second nickel-plated copper sheet and the second connecting copper sheet.

[0013] In one of the embodiments, the first nickel-plated copper sheet partially covers the first connecting copper sheet, and the second nickel-plated copper sheet partially covers the second connecting copper sheet.

[0014] In one of the embodiments, one end of the first nickel-plated copper sheet extends to outside of the battery cell, and one end of the second nickel-plated copper sheet extends to outside of the battery cell.

[0015] In one of the embodiments, the first nickel-plated copper sheet is located between the first connecting copper sheet and the battery cell.

[0016] In one of the embodiments, the second nickel-plated copper sheet is located between the second connecting copper sheet and the battery cell.

[0017] A lithium ion battery comprises the structure of the low-resistance lithium battery protection switch in any of the above embodiments.

[0018] Compared with the prior art, the present disclosure has at least the following advantages:

[0019] The aforementioned low internal resistance lithium battery protection switch and lithium-ion battery are integrated by connecting the first nickel-plated copper sheet to the electrode of the battery cell, making the protection switch assembly and the battery cell a single unit. The second nickel-plated copper sheet is connected to the second connecting copper sheet of the protection switch assembly. The second nickel-plated copper sheet is used to connect to the charging power supply or discharging power supply, making the protection switch assembly structure compact. The first and second nickel-plated copper sheets have low resistance, reducing current loss in the circuit and making the circuit of the low internal resistance lithium battery protection switch structure more efficient. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a low internal resistance lithium battery protection switch according to an embodiment.

[0022] Figure 2 for Figure 1 The diagram shows the structure of the protective switch assembly. Detailed Implementation

[0023] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.

[0024] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] In order to better understand the technical solutions and beneficial effects of the present disclosure, the present disclosure will be further described in detail below in combination with specific embodiments:

[0027] As shown in Figure 1 and Figure 2 The structure 10 of the low-resistance lithium battery protection switch according to an embodiment of the present disclosure includes a battery cell 100 and a protection switch assembly 200. One end of the battery cell 100 is provided with a receiving groove 101. The battery cell 100 is provided with a tab connecting end 110 and is used for charging and discharging.

[0028] Further, the protection switch assembly 200 includes a first nickel-plated copper sheet 210, a second nickel-plated copper sheet 220, a protection switch body 230, a first connecting copper sheet 240, and a second connecting copper sheet 250. The protection switch body 230 cuts off the circuit when the temperature of the circuit is too high or the current is too large. The protection switch body 230 is connected with the first connecting copper sheet 240 and the second connecting copper sheet 250 on both sides, respectively. The first connecting copper sheet 240, the second connecting copper sheet 250, and the protection switch body 230 are all located in the receiving groove 101. The first nickel-plated copper sheet 210 is connected to the first connecting copper sheet 240. The second nickel-plated copper sheet 220 is connected to the second connecting copper sheet 250. The first nickel-plated copper sheet 210 is connected with the tab connecting end 110 of the battery cell 100. The second nickel-plated copper sheet 220 is used for connecting with a charging source or a discharging source. Specifically, the second nickel-plated copper sheet 220 is used for connecting with a charger or an electrical equipment. That is, the charger charges through the second nickel-plated copper sheet 220, and the battery cell supplies power to the electrical equipment through the second nickel-plated copper sheet 220.

[0029] In the embodiment, the first nickel-plated copper sheet 210 is connected with the tab connecting end 110 of the battery cell 100, and the second nickel-plated copper sheet 220 is connected with a charging source or a discharging source. When the battery cell 100 is discharged, the current passes through the first nickel-plated copper sheet 210, the first connecting copper sheet 240, the protection switch body 230, the second connecting copper sheet 250, and the second nickel-plated copper sheet 220 in sequence. When the battery cell 100 is charged, the current passes through the second nickel-plated copper sheet 220, the second connecting copper sheet 250, the protection switch body 230, the first connecting copper sheet 240, and the first nickel-plated copper sheet 210 in sequence. The copper in the first nickel-plated copper sheet 210 and the second nickel-plated copper sheet 220 has lower internal resistance than nickel, but copper is easily oxidized when in contact with air and is not conducive to welding due to light reflection. The nickel-plated copper sheet solves the problems of corrosion resistance and laser welding. The internal resistance of the first nickel-plated copper sheet 210 and the second nickel-plated copper sheet 220 is relatively small. Specifically, when the internal resistance of a pure nickel sheet of an embodiment before being connected with the battery cell 100 is 3.7 mΩ, the internal resistance of the first nickel-plated copper sheet 210 and the second nickel-plated copper sheet 220 of the same size is 1.7 mΩ. When the temperature of the circuit of the battery cell 100 is too high or the current is too large, the protection switch body 230 can cut off the circuit to protect the battery cell 100. The first connecting copper sheet 240, the second connecting copper sheet 250, and the protection switch body 230 are located in the accommodating groove 101, which can reduce the collision between the first nickel-plated copper sheet 210, the first connecting copper sheet 240, the protection switch body 230, the second connecting copper sheet 250, and the second nickel-plated copper sheet 220. The inner wall of the accommodating groove 101 of the battery cell 100 can also support the protection switch body 230, so that the protection switch body 230 remains stable.

[0030] The low-internal-resistance lithium battery protection switch structure 10 described above is connected with the tab connecting end 110 of the battery cell 100 through the first nickel-plated copper sheet 210, so that the protection switch assembly 200 is connected with the battery cell 100 as a whole. The second nickel-plated copper sheet 220 is connected with the second connecting copper sheet 250 of the protection switch assembly 200, and the second nickel-plated copper sheet 220 is used to be connected with a charging source or a discharging source as a whole, so that the protection switch assembly 200 has a compact structure. The first nickel-plated copper sheet 210 and the second nickel-plated copper sheet 220 have low resistance, which reduces the loss of current in the circuit and makes the circuit of the low-internal-resistance lithium battery protection switch structure 10 more efficient.

[0031] As shown in FIG. 1, Figure 2 In one embodiment, the first connecting copper sheet 240 is provided with a bending portion 241 adjacent to one end of the protection switch body 230, so that the first connecting copper sheet 240 is close to the tab connecting end 110 of the battery cell 100. In the embodiment, the bending portion 241 of the first connecting copper sheet 240 makes the first nickel-plated copper sheet 210 connected with the first connecting copper sheet 240 closer to the tab of the battery cell 100, so that the first nickel-plated copper sheet 210 is more closely attached to the tab of the battery cell 100, thereby making the low-internal-resistance lithium battery protection switch structure 10 more compact.

[0032] As shown in Figure 1 one of the embodiments, the first nickel-plated copper sheet 210 is arranged in parallel with the second nickel-plated copper sheet 220. In this embodiment, after the first nickel-plated copper sheet 210 is fixed, the second nickel-plated copper sheet 220 is arranged correspondingly with the first nickel-plated copper sheet 210, so that the second nickel-plated copper sheet 220 is more regular in spatial layout, which is conducive to reducing the occupied space and reducing the misplacement of the second nickel-plated copper sheet 220.

[0033] As shown in Figure 1 one of the embodiments, the first nickel-plated copper sheet 210 is welded integrally with the first connecting copper sheet 240, and the second nickel-plated copper sheet 220 is welded integrally with the second connecting copper sheet 250. In this embodiment, welding is used to form a close metal bond between the first nickel-plated copper sheet 210 and the first connecting copper sheet 240, and between the second nickel-plated copper sheet 220 and the second connecting copper sheet 250, thereby ensuring the stability and reliability of the electrical connection.

[0034] As shown in Figure 2 one of the embodiments, a plurality of spaced welding points are arranged between the first nickel-plated copper sheet 210 and the first connecting copper sheet 240, and a plurality of spaced welding points are arranged between the second nickel-plated copper sheet 220 and the second connecting copper sheet 250. In this embodiment, the plurality of spaced welding points between the first nickel-plated copper sheet 210 and the first connecting copper sheet 240 increase the connection strength of the first nickel-plated copper sheet 210 and the first connecting copper sheet 240, and the plurality of spaced welding points between the second nickel-plated copper sheet 220 and the second connecting copper sheet 250 increase the connection strength of the second nickel-plated copper sheet 220 and the second connecting copper sheet 250, thereby further improving the reliability of the connection of the first nickel-plated copper sheet 210 and the second nickel-plated copper sheet 220.

[0035] As shown in Figure 2 one of the embodiments, the first nickel-plated copper sheet 210 partially covers the first connecting copper sheet 240, and the second nickel-plated copper sheet 220 partially covers the second connecting copper sheet 250. In this embodiment, the first connecting copper sheet 240 and the second connecting copper sheet 250 are small, so that the structure of the protective switch assembly 200 is small. The first nickel-plated copper sheet 210 partially covers the first connecting copper sheet 240, and the second nickel-plated copper sheet 220 partially covers the second connecting copper sheet 250, so that the contact area of the first connecting copper sheet 240 and the first nickel-plated copper sheet 210 is large, and the contact area of the second connecting copper sheet 250 and the second nickel-plated copper sheet 220 is large, thereby making the internal resistance of the protective switch assembly 200 small, and further making the loss of the current passing through the first nickel-plated copper sheet 210, the first connecting copper sheet 240, the second nickel-plated copper sheet 220 and the second connecting copper sheet 250 small.

[0036] like Figure 1 As shown, in one embodiment, one end of the first nickel-plated copper sheet 210 extends outside the battery cell 100, and one end of the second nickel-plated copper sheet 220 extends outside the battery cell 100. In this embodiment, the extension portion of the first nickel-plated copper sheet 210 extending outside the battery cell 100 is the contact area between the first nickel-plated copper sheet 210 and the electrode. The extension portion facilitates the welding between the first nickel-plated copper sheet 210 and the electrode. The extension portion of the second nickel-plated copper sheet 220 increases the contact surface between the second nickel-plated copper sheet 220 and the charging or discharging power source, thereby facilitating the connection between the second nickel-plated copper sheet 220 and the charging or discharging power source.

[0037] like Figure 1 As shown, in one embodiment, the first nickel-plated copper sheet 210 is located between the first connecting copper sheet 240 and the battery cell 100. In this embodiment, the first nickel-plated copper sheet 210 is located between the first connecting copper sheet 240 and the battery cell 100. The first nickel-plated copper sheet 210 is closer to the inner wall of the receiving groove 101 of the battery cell 100, which makes the receiving groove 101 of the battery cell 100 provide better protection for the first nickel-plated copper sheet 210 and makes the structure between the battery cell 100, the first nickel-plated copper sheet 210 and the first connecting copper sheet 240 more compact.

[0038] like Figure 1 As shown, in one embodiment, the second nickel-plated copper sheet 220 is located between the second connecting copper sheet 250 and the battery cell 100. In this embodiment, the second nickel-plated copper sheet 220 is located between the second connecting copper sheet 250 and the battery cell 100, and the second nickel-plated copper sheet 220 is closer to the inner wall of the receiving groove 101 of the battery cell 100, so that the receiving groove 101 of the battery cell 100 provides better protection for the second nickel-plated copper sheet 220, reduces the impact on the second nickel-plated copper sheet 220, and makes the structure between the battery cell 100, the second nickel-plated copper sheet 220 and the second connecting copper sheet 250 more compact.

[0039] This application also provides a lithium-ion battery, including the structure 10 of the low internal resistance lithium battery protection switch described in any of the above embodiments. In this embodiment, by mounting the protection switch body 230 in the receiving slot 101 opened in the cell 100, the collision of the protection switch body 230 with the cell 100 is reduced, the resistance of the first nickel-plated copper sheet 210 and the second nickel-plated copper sheet 220 is lower, reducing current loss in the circuit and making the lithium-ion battery circuit more efficient.

[0040] Compared with the prior art, this disclosure has at least the following advantages:

[0041] The low-resistance lithium battery protection switch structure 10 is connected with the first nickel-plated copper sheet 210 and the pole piece connecting end 110, so that the protection switch assembly 200 is connected with the battery cell 100 as a whole, the second nickel-plated copper sheet 220 is connected with the second connecting copper sheet 250 of the protection switch assembly 200, the second nickel-plated copper sheet 220 is used for being connected with the charging source or the discharging source as a whole, so that the protection switch assembly 200 is compact in structure; the resistances of the first nickel-plated copper sheet 210 and the second nickel-plated copper sheet 220 are low, the current loss in the circuit is reduced, and the circuit of the low-resistance lithium battery protection switch structure 10 is more efficient.

[0042] The above-described embodiments only express several implementation manners of the present disclosure, and the description is relatively specific and detailed, but it cannot be understood as a limitation on the scope of the disclosed patent. It should be noted that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure patent should be subject to the appended claims.

Claims

1. A structure of a low-internal-resistance lithium battery protection switch, characterized by comprising: The low-resistance lithium battery protection switch comprises an electric core and a protection switch assembly, and an accommodating groove is formed in one end of the electric core. The protection switch assembly comprises a first nickel-plated copper sheet, a second nickel-plated copper sheet, a protection switch body, a first connecting copper sheet and a second connecting copper sheet, the two sides of the protection switch body are connected with the first connecting copper sheet and the second connecting copper sheet respectively, the first connecting copper sheet, the second connecting copper sheet and the protection switch body are located in the accommodating groove, the first nickel-plated copper sheet is connected with the first connecting copper sheet, the second nickel-plated copper sheet is connected with the second connecting copper sheet, the first nickel-plated copper sheet is connected with the pole connecting end of the electric core, and the second nickel-plated copper sheet is used for being connected with a charging source or a discharging source.

2. The structure of a low-internal-resistance lithium battery protection switch according to claim 1, characterized in that, The first connecting copper sheet is provided with a bending part adjacent to one end of the protection switch body, so that the first connecting copper sheet is close to the pole connecting end of the electric core.

3. The structure of a low-internal-resistance lithium battery protection switch according to claim 1, characterized in that, The first nickel-plated copper sheet and the second nickel-plated copper sheet are arranged in parallel.

4. The structure of a low-internal-resistance lithium battery protection switch according to claim 1, characterized by, The first nickel-plated copper sheet and the first connecting copper sheet are welded integrally, and the second nickel-plated copper sheet and the second connecting copper sheet are welded integrally.

5. The structure of a low-internal-resistance lithium battery protection switch according to claim 1, characterized by, A plurality of welding points are arranged between the first nickel-plated copper sheet and the first connecting copper sheet, and a plurality of welding points are arranged between the second nickel-plated copper sheet and the second connecting copper sheet.

6. The structure of a low-internal-resistance lithium battery protection switch according to claim 1, wherein The first nickel-plated copper sheet partially covers the first connecting copper sheet, and the second nickel-plated copper sheet partially covers the second connecting copper sheet.

7. The structure of a low-internal-resistance lithium battery protection switch according to claim 6, characterized in that, One end of the first nickel-plated copper sheet extends out of the electric core, and one end of the second nickel-plated copper sheet extends out of the electric core.

8. The structure of a low-internal-resistance lithium battery protection switch according to claim 1, characterized in that, The first nickel-plated copper sheet is located between the first connecting copper sheet and the electric core.

9. The structure of a low-internal-resistance lithium battery protection switch according to claim 1, characterized by, The second nickel-plated copper sheet is located between the second connecting copper sheet and the electric core.

10. A lithium-ion battery, characterized by, The structure of the low-resistance lithium battery protection switch comprises the low-resistance lithium battery protection switch according to any one of claims 1 to 9.

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