Battery over-temperature protection structure and battery

Abstract

The utility model relates to the technical field of batteries, in particular to a battery over-temperature protection structure and a battery. The battery over-temperature protection structure comprises a circuit board, a flexible circuit board and a temperature protection device, and the temperature protection device is arranged on the flexible circuit board and is electrically connected with the circuit board through the flexible circuit board. According to the invention, the circuit board, the flexible circuit board and the temperature protection device are arranged, the temperature protection device is arranged on the flexible circuit board and is electrically connected with the circuit board through the flexible circuit board, so that the number of parts for electrically connecting the temperature protection device and the circuit board is small, the structure is simplified, the processing difficulty is reduced, and the reject ratio is reduced; since the temperature protection device is electrically connected with the circuit board through the flexible circuit board, only a position for connecting the electric connection end of the flexible circuit board needs to be reserved on the circuit board, and compared with a scheme that the temperature protection device is integrally arranged on the circuit board, the space occupied by the connection of the flexible circuit board on the circuit board is smaller, and the temperature protection device is suitable for the condition of the circuit board with smaller size.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an over-temperature protection structure for a battery and a battery. Background Art

[0002] To ensure the normal use of a battery, a temperature protection device is usually provided in the battery. When the battery temperature is too high, the temperature protection device will cut off the circuit.

[0003] In the related art, there are two ways for the over-temperature protection structure of a battery. The first way is to arrange the temperature protection device on the circuit board in a patch manner. The second way can be referred to Figure 1 and Figure 2 , the temperature protection device 110 is connected to the adapter nickel sheet 120, and then the adapter nickel sheet 120 is welded to the electrode tab of the battery cell. The electrode tab of the battery cell is electrically connected to the circuit board to realize the protection of the circuit. Among them, during the installation and connection process of the temperature protection device 110 and the adapter nickel sheet 120, multiple adhesive tapes 130 are required for bonding and insulation. There are many components used, the processing difficulty is large, and the defective rate is high.

[0004] In the case where the width of the battery cell is small and the corresponding size of the circuit board is small, due to the large space occupied by the temperature protection device, the first installation method is not applicable. Although the second method is applicable, the processing difficulty is large and the defective rate is high. Summary of the Utility Model

[0005] The technical problem to be solved by the embodiments of the utility model is to provide an over-temperature protection structure for a battery and a battery to solve the problems of large processing difficulty and high defective rate of the over-temperature protection structure for a battery applicable to a small-sized circuit board in the prior art.

[0006] The utility model discloses an over-temperature protection structure for a battery, which includes a circuit board, a flexible printed circuit board and a temperature protection device. The temperature protection device is arranged on the flexible printed circuit board and is electrically connected to the circuit board through the flexible printed circuit board.

[0007] Optionally, pads are arranged on the circuit board, and the electrical connection ends of the flexible printed circuit board are welded to the pads.

[0008] Optionally, a protection switch device is arranged on the circuit board, and the temperature protection device is arranged away from the protection switch device.

[0009] Optionally, the temperature protection device includes one of a circuit breaker, a thermistor and a thermal fuse.

[0010] The utility model also discloses a battery, which includes a battery cell, an electrode tab of the battery cell and the over-temperature protection structure for a battery as described above. Both the battery cell and the circuit board of the over-temperature protection structure for a battery are electrically connected to the electrode tab of the battery cell.

[0011] Optionally, the temperature protection device is fixed on the battery cell, and the protection switch device and the temperature protection device are respectively located on the front and back sides of the circuit board, and the protection switch device and the temperature protection device are arranged staggeredly along the length direction of the circuit board.

[0012] Optionally, a top-sealing protrusion protrudes from the top of the battery cell, the top-sealing protrusion extends along the width direction of the battery cell, the circuit board and the temperature protection device are respectively located on both sides of the top-sealing protrusion, and the battery cell tab is arranged on the top-sealing protrusion.

[0013] Optionally, the flexible printed circuit board includes a first connection section, a bending section and a second connection section connected in sequence. The first connection section is electrically connected to the circuit board and is located on the front side of the circuit board, and extends to the second connection section through the bending section. The second connection section is located on the back side of the circuit board. The temperature protection device is arranged on the second connection section and is fixed on the top-sealing protrusion through the second connection section, and the protection switch device is located on the front side of the circuit board.

[0014] Optionally, the battery further includes a first adhesive, and the second connection section is adhesively fixed to one side of the top-sealing protrusion through the first adhesive.

[0015] Optionally, the battery further includes a second adhesive, and the circuit board is adhesively fixed to the other side of the top-sealing protrusion through the second adhesive.

[0016] Compared with the prior art, the beneficial effects of the battery over-temperature protection structure and the battery provided by the embodiment of the present invention are as follows: by arranging a circuit board, a flexible printed circuit board and a temperature protection device, the temperature protection device is arranged on the flexible printed circuit board and is electrically connected to the circuit board through the flexible printed circuit board, so that the components for electrically connecting the temperature protection device and the circuit board are fewer, the structure is simplified, the processing difficulty is reduced, the defective rate is reduced, and moreover, since the temperature protection device is electrically connected to the circuit board through the flexible printed circuit board, only a position for connecting the electrical connection end of the flexible printed circuit board needs to be reserved on the circuit board. Compared with the scheme of arranging the temperature protection device integrally on the circuit board, the space occupied by the connection of the flexible printed circuit board on the circuit board is smaller, and it is applicable to the case of a smaller-size circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The technical solutions of the present invention will be further described in detail below with reference to the drawings and embodiments. In the drawings:

[0018] Figure 1 is a partial structural schematic diagram of an existing battery over-temperature protection structure;

[0019] Figure 2 is Figure 1Explosion schematic diagram;

[0020] Figure 3 is a partial three-dimensional schematic diagram of the battery provided by the embodiment of the present utility model;

[0021] Figure 4 is Figure 3 Explosion schematic diagram.

[0022] Each reference numeral in the figure is:

[0023] 110, temperature protection device; 120, transfer nickel sheet; 130, adhesive tape;

[0024] 210, circuit board; 220, flexible printed circuit board; 221, first connection section; 222, bending section; 223, second connection section; 230, temperature protection device; 240, protection switch device; 250, battery cell; 251, top seal protrusion; 260, battery cell tab; 270, second adhesive member. Detailed implementation manners

[0025] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. Now, in conjunction with the drawings, the preferred embodiments of the present utility model will be described in detail.

[0026] The embodiment of the present utility model provides a battery over-temperature protection structure. As Figure 3 shown, the battery over-temperature protection structure includes a circuit board 210, a flexible printed circuit board 220, and a temperature protection device 230. The temperature protection device 230 is disposed on the flexible printed circuit board 220 and is electrically connected to the circuit board 210 through the flexible printed circuit board 220.

[0027] In the present application, by providing the circuit board 210, the flexible printed circuit board 220, and the temperature protection device 230, the temperature protection device 230 is disposed on the flexible printed circuit board 220 and is electrically connected to the circuit board 210 through the flexible printed circuit board 220, so that the components for electrically connecting the temperature protection device 230 and the circuit board 210 are fewer, the structure is simplified, the processing difficulty is reduced, the production efficiency is improved, and the defective rate is reduced. Moreover, since the temperature protection device 230 is electrically connected to the circuit board 210 through the flexible printed circuit board 220, only a position for connecting the electrical connection end of the flexible printed circuit board 220 needs to be reserved on the circuit board 210. Compared with the scheme of disposing the temperature protection device 230 entirely on the circuit board 210, the space on the circuit board 210 occupied by the connection of the flexible printed circuit board 220 is smaller, which is applicable to the case of a smaller-sized circuit board 210.

[0028] Among them, the flexible printed circuit board 220, also known as a "flexible board", is a printed circuit made of a flexible insulating substrate. The flexible printed circuit board 220 provides excellent electrical performance, can meet the design requirements of smaller and higher-density installations, and also helps to reduce the assembly process and enhance reliability. The flexible printed circuit board 220 can be freely bent, wound, and folded, can be arranged arbitrarily according to the spatial layout requirements, and can move and stretch arbitrarily in three-dimensional space, so as to achieve the integration of component assembly and wire connection. The flexible printed circuit board 220 can greatly reduce the volume and weight of the applied product.

[0029] Through the flexible printed circuit board 220, an operator can bend the flexible printed circuit board 220 to adjust the position of the temperature protection device 230, so that the temperature monitored by the temperature protection device 230 is the temperature of the position to be protected, and false judgments caused by heat generation at other positions can be reduced.

[0030] In this embodiment, pads are provided on the circuit board 210, and the electrical connection ends of the flexible printed circuit board 220 are soldered to the pads. The electrical connection ends of the flexible printed circuit board 220 are soldered to the pads on the circuit board 210, and the electrical connection of the temperature protection device 230 to the circuit board 210 only occupies the position of the pads. Compared with the method of disposing the temperature protection device 230 integrally on the circuit board 210, the space occupied by the present application on the circuit board 210 is smaller, and it is applicable to the case of a circuit board 210 with a smaller size.

[0031] In other embodiments, insertion holes can also be provided on the circuit board 210, and the electrical connection ends of the flexible printed circuit board 220 are in the form of pins and are adaptively inserted into the insertion holes to achieve electrical connection with the circuit board 210, and the space occupied on the circuit board 210 is also smaller.

[0032] Reference Figure 3 and Figure 4 , in this embodiment, a protection switch device 240 is provided on the circuit board 210, and the temperature protection device 230 is disposed away from the protection switch device 240.

[0033] The protection switch device 240 is used to assist in controlling the charging and discharging of the battery to avoid abnormal operations such as overcharging, over-discharging, overcurrent, or overvoltage of the battery. For example, when the voltage reaches the set upper limit during the battery charging process, the protection switch device 240 can disconnect the charging circuit to prevent overcharging; similarly, when the battery discharges to a certain extent, the protection switch device 240 can also cut off the discharge circuit to prevent over-discharging. The protection switch device 240 generates a large amount of heat during operation, and the generated heat has a certain impact on the temperature protection device 230. The use of the protection switch device 240 to assist in controlling the charging and discharging of the battery belongs to the prior art, and its specific circuit structure is not within the protection scope of the present invention, and its working principle will not be elaborated here.

[0034] By disposing the temperature protection device 230 away from the protection switch device 240, the influence of the heat generated by the protection switch device 240 on the temperature protection device 230 can be reduced, so that the temperature protection device 230 is in a normal working state.

[0035] The temperature protection device 230 includes one of a circuit breaker, a thermistor, and a thermal fuse. In this embodiment, the circuit breaker is preferably used as the temperature protection device 230. The function of the circuit breaker is that when a certain temperature is reached, the circuit breaker will automatically disconnect the circuit, thereby preventing the applied battery from operating at an abnormal temperature. The circuit breaker is disposed on the flexible circuit board 220, and the flexible circuit board 220 can be bent to bend the circuit breaker to the position where the temperature needs to be monitored.

[0036] The embodiment of the present utility model also provides a battery, as Figure 3 and Figure 4 shown, the battery includes a battery cell 250, a battery cell tab 260, and the battery over-temperature protection structure as described above. Both the battery cell 250 and the circuit board 210 of the battery over-temperature protection structure are electrically connected to the battery cell tab 260.

[0037] In the battery of the present application, the battery over-temperature protection structure is provided with a circuit board 210, a flexible circuit board 220, and a temperature protection device 230. The temperature protection device 230 is disposed on the flexible circuit board 220 and is electrically connected to the circuit board 210 through the flexible circuit board 220. The components for electrically connecting the temperature protection device 230 and the circuit board 210 are fewer, the structure is simplified, the processing difficulty is reduced, the production efficiency is improved, and the defective rate is reduced. Moreover, since the temperature protection device 230 is electrically connected to the circuit board 210 through the flexible circuit board 220, only a position for connecting the electrical connection end of the flexible circuit board 220 needs to be reserved on the circuit board 210. Compared with the scheme of disposing the temperature protection device 230 integrally on the circuit board 210, the space occupied by the connection of the flexible circuit board 220 on the circuit board 210 is smaller, which is applicable to the case of a smaller-sized circuit board 210.

[0038] The battery over-temperature protection structure of the embodiment of the present utility model can be applicable to a battery cell 250 with a relatively narrow width, such as a battery cell 250 with a width less than 30 mm. The corresponding size of the circuit board 210 is smaller. For the electrical connection between the temperature protection device 230 and the circuit board 210, only a position for connecting the electrical connection end of the flexible circuit board 220 needs to be reserved on the circuit board 210.

[0039] In this embodiment, referring to Figure 3 and Figure 4 , the temperature protection device 230 is fixed on the battery cell 250. The protection switch device 240 and the temperature protection device 230 are respectively located on the front and back surfaces of the circuit board 210, and the protection switch device 240 and the temperature protection device 230 are arranged offset along the length direction of the circuit board 210.

[0040] Through the above distribution setting method of the temperature protection device 230 and the protection switch device 240, a certain distance can be provided between the temperature protection device 230 and the protection switch device 240, reducing the influence of the protection switch device 240 on the temperature protection device 230, so that the temperature protection device 230 can effectively reflect the temperature of the monitored battery cell 250.

[0041] Furthermore, a top-sealing protrusion 251 protrudes from the top of the battery cell 250. The top-sealing protrusion 251 extends along the width direction of the battery cell 250. The circuit board 210 and the temperature protection device 230 are located on both sides of the top-sealing protrusion 251, and the battery cell tab 260 is arranged on the top-sealing protrusion 251.

[0042] By separating the circuit board 210 and the temperature protection device 230 on both sides of the top-sealing protrusion 251 and separating them with the top-sealing protrusion 251, the distance between the temperature protection device 230 and the protection switch device 240 can be further increased, and the influence of the protection switch device 240 on the temperature protection device 230 can be further reduced. The top-sealing protrusion 251 can also provide a certain structural support for the battery cell tab 260.

[0043] Specifically, the flexible printed circuit board 220 includes a first connection section 221, a bending section 222, and a second connection section 223 connected in sequence. The first connection section 221 is electrically connected to the circuit board 210 and is located on the front side of the circuit board 210, and extends to the second connection section 223 through the bending section 222. The second connection section 223 is located on the back side of the circuit board 210. The temperature protection device 230 is disposed on the second connection section 223 and is fixed on the top-sealing protrusion 251 through the second connection section 223. The protection switch device 240 is located on the front side of the circuit board 210.

[0044] The flexible printed circuit board 220 realizes electrical connection with the circuit board 210 through the first connection section 221, and connects the first connection section 221 and the second connection section 223 through the bending section 222 to adapt to the top-sealing protrusion 251, thereby distributing the circuit board 210 and the temperature protection device 230 on both sides of the top-sealing protrusion 251, which is convenient for assembly and has low processing difficulty. The second connection section 223 is fixed on the top-sealing protrusion 251, and further fixes the temperature protection device 230 on the top-sealing protrusion 251, and the overall structure stability of the battery is relatively high.

[0045] In this embodiment, the battery further includes a first adhesive member (not shown in the figure). The second connecting section 223 is adhesively fixed to one side of the top sealing projection 251 through the first adhesive member. By using the first adhesive member, the second connecting section 223 is adhesively fixed to the top sealing projection 251, thereby adhesively fixing the temperature protection device 230 to the top sealing projection 251, enabling the temperature protection device 230 to effectively monitor the temperature of the battery cell 250 while maintaining the overall structural stability. The second connecting section 223 is adhesively fixed with the first adhesive member, and the assembly is simple.

[0046] Specifically, the first adhesive member can be a double-sided adhesive tape, an adhesive sheet, a pressure-sensitive film, etc. Preferably, the first adhesive member is a double-sided adhesive tape. One side of the double-sided adhesive tape adheres to the second connecting section 223, and the other side adheres to the top sealing projection 251. The double-sided adhesive tape has good adhesion performance, can firmly bond two surfaces, ensuring the firmness of the connection. It is applicable to various different types of materials and surfaces, such as metals, plastics, glass, etc., and has good versatility; the double-sided adhesive tape does not require waiting for a drying time and can achieve an adhesive effect immediately, saving time and improving efficiency; the double-sided adhesive tape usually does not leave residues or residual marks and is easy to clean, helping to keep the overall appearance clean.

[0047] Reference Figure 3 and Figure 4 In this embodiment, the battery further includes a second adhesive member 270. The circuit board 210 is adhesively fixed to the other side of the top sealing projection 251 through the second adhesive member 270.

[0048] By using the second adhesive member 270, the circuit board 210 is adhesively fixed to the top sealing projection 251, thereby effectively fixing the circuit board 210 on the battery cell 250, preventing it from loosening or shifting during use, maintaining the stability and reliability of the overall structure, and also helping to simplify the assembly process and further reduce the production and processing difficulty.

[0049] Specifically, the second adhesive member 270 can be a double-sided adhesive tape, an adhesive sheet, a pressure-sensitive film, etc. Preferably, the second adhesive member 270 is also a double-sided adhesive tape. One side of the double-sided adhesive tape adheres to the circuit board 210, and the other side adheres to the top sealing projection 251, and the assembly is simple.

[0050] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Those skilled in the art can modify the technical solutions recorded in the above embodiments or perform equivalent replacements for some of the technical features; and all such modifications and replacements should fall within the protection scope of the appended claims of the present invention.

Claims

1. A battery over-temperature protection structure, characterized in that It includes a circuit board, a flexible printed circuit board, and a temperature protection device. The temperature protection device is disposed on the flexible printed circuit board and is electrically connected to the circuit board through the flexible printed circuit board.

2. The battery over-temperature protection structure according to claim 1, characterized in that, A pad is provided on the circuit board, and the electrical connection end of the flexible printed circuit board is welded to the pad.

3. The battery over-temperature protection structure according to claim 1 or 2, characterized in that, A protection switch device is provided on the circuit board, and the temperature protection device is disposed away from the protection switch device.

4. The battery over-temperature protection structure according to claim 3, wherein, The temperature protection device includes one of a circuit breaker, a thermistor, and a thermal fuse.

5. A battery, comprising a battery cell, battery cell tabs, and the battery over-temperature protection structure according to claim 3 or 4, wherein both the battery cell and the circuit board of the battery over-temperature protection structure are electrically connected to the battery cell tabs.

6. The battery according to claim 5, characterized in that, The temperature protection device is fixed on the battery cell, the protection switch device and the temperature protection device are respectively located on the front and back of the circuit board, and the protection switch device and the temperature protection device are staggeredly arranged along the length direction of the circuit board.

7. The battery according to claim 6, characterized in that, A top-sealing protrusion protrudes from the top of the battery cell, the top-sealing protrusion extends along the width direction of the battery cell, the circuit board and the temperature protection device are respectively located on both sides of the top-sealing protrusion, and the battery cell tabs are arranged on the top-sealing protrusion.

8. The battery according to claim 7, characterized in that, The flexible printed circuit board includes a first connection segment, a bending segment, and a second connection segment connected in sequence. The first connection segment is electrically connected to the circuit board and is located on the front of the circuit board, extends to the second connection segment through the bending segment, the second connection segment is located on the back of the circuit board, the temperature protection device is disposed on the second connection segment, and is fixed on the top-sealing protrusion through the second connection segment, and the protection switch device is located on the front of the circuit board.

9. The battery according to claim 8, characterized in that, The battery further includes a first adhesive member, and the second connection segment is adhesively fixed to one side of the top-sealing protrusion through the first adhesive member.

10. The battery according to claim 9, characterized in that, The battery further includes a second adhesive member, and the circuit board is adhesively fixed to the other side of the top-sealing protrusion through the second adhesive member.

Images