Battery pack with PTC safety component

Abstract

The utility model provides a battery pack (100) with a PTC (Positive Temperature Coefficient) safety component, which is characterized in that the battery pack (100) is provided with a battery pack (2) and a PTC safety component (1), the PTC safety component (1) is provided with a chip component (7) and a laminated body (8) which are connected through electric resistance welding, the laminated body (8) is sequentially composed of a pin (4), an insulating plate (6) and another pin (5), the pin (4) is connected with a positive electrode of a single battery (3) through electric resistance welding, and the insulating plate (6) is connected with a negative electrode of the single battery (3) through electric resistance welding. And the other pin (5) is connected with the negative electrode of the other single battery (9) through electric resistance welding.

Description

Technical Field

[0001] The utility model relates to a battery pack with a PTC safety component. Background Art

[0002] In recent years, power storage devices, especially secondary batteries, have been widely used in small electronic devices such as mobile phones or laptop computers, electric vehicles, or power storage. In these electronic devices, vehicles, or power storage applications, it is therefore necessary to improve the electrochemical characteristics well. Battery packs are also used as power sources, backup power sources, etc. for power tools, electric toys, electric bicycles, electric vehicles, electric skateboards, cordless telephones, etc. Therefore, a battery pack with well-improved electrochemical characteristics is expected.

[0003] CN218731684U discloses a convex-shaped battery pack, which includes a first battery 10 and a second battery 20 arranged side by side. The polarities of the first battery 10 and the second battery 20 are opposite on the same side; a third battery 30 is arranged on one axial side of the first battery 10 and the second battery 20, and the positive electrode of the third battery 30 is located on the side facing the first battery 10; the positive electrode of the second battery 20 is electrically connected to the negative electrode of the first battery 10 through a first connecting piece (PTC safety component) 12, and the negative electrode of the second battery 20 is electrically connected to the positive electrode of the third battery 30 through a second connecting piece 32; the positive electrode of the first battery 10 is connected with a positive electrode wire 14, and the negative electrode of the third battery 30 is connected with a negative electrode wire 34, so that the connection positions of the positive electrode wire 14 and the negative electrode wire 34 respectively extend to the middle parts of the first battery 10 and the second battery 20.

[0004] The existing PTC safety component has a two-side single-pin structure. The PTC safety component is located at the end of the battery, and the two pins are respectively connected to the positive and negative electrodes of the battery. However, if the battery is small and the chip of the PTC safety component is large, the PTC safety component cannot be located at the end of the battery. Although the PTC safety component can be located on the side of the battery, the connection method is relatively complex, and one side cannot be directly connected to the positive and negative electrodes of the battery, resulting in low productivity during assembly. Due to the inability to be directly connected to the battery, it causes inconvenience in assembly, a complex overall structure, high cost, and a decline in productivity.

[0005] The existing battery packs with PTC safety components have the following problems: The ordinary PTC safety component is affected by the shape and size of the battery, and the selectable range of the size of the PTC safety component is small and it cannot be used. For the extended PTC safety component, the connection methods of the related components and the wire tree are complex and the assembly is inconvenient. The material cost of the battery pack is high and the productivity is low. Summary of the Utility Model

[0006] The present utility model is made in view of the problems existing in such prior art. Moreover, the purpose of the present utility model is to provide a battery pack with a PTC safety component. The battery pack with a PTC safety component of the present utility model includes a battery pack and a PTC safety component. The PTC safety component has a chip component and a laminate connected by resistance welding. The laminate is successively composed of a lead, an insulating plate, and another lead. The lead is connected to the positive electrode of a single cell by resistance welding, and the other lead is connected to the negative electrode of another single cell by resistance welding.

[0007] The gist of the present utility model is as follows.

[0008] (1) A battery pack with a PTC safety component, characterized in that it has a battery pack and a PTC safety component. The PTC safety component has a chip component and a laminate connected by resistance welding. The laminate is successively composed of a lead, an insulating plate, and another lead. The lead is connected to the positive electrode of a single cell by resistance welding, and the other lead is connected to the negative electrode of another single cell by resistance welding.

[0009] (2) The battery pack with a PTC safety component according to claim (1), characterized in that the battery pack is a lithium battery pack or a nickel-metal hydride battery pack.

[0010] (3) The battery pack with a PTC safety component according to claim (1), characterized in that the lead is a nickel sheet.

[0011] (4) The battery pack with a PTC safety component according to claim (1), characterized in that the lead is an L-shaped lead, and the end of the short side is circular.

[0012] (5) The battery pack with a PTC safety component according to claim (1), characterized in that the other lead is an L-shaped lead, and the end of the short side is circular.

[0013] (6) The battery pack with a PTC safety component according to claim (1), characterized in that the chip component of the bent PTC safety component is on the side of the battery pack.

[0014] (7) The battery pack with a PTC safety component according to claim (1), characterized in that the chip component is successively laminated by a conductive plate, a layer made of a polymer polymer raw material doped with a conductor, and a conductive plate layer.

[0015] (8) The battery pack with a PTC safety component according to claim (1), characterized in that the conductive plate is a nickel sheet.

[0016] Effect of the utility model

[0017] The present utility model can provide a battery pack with a PTC safety component, wherein the PTC has a single-sided double-pin structure. The battery pack with the PTC safety component of the present utility model is not affected by the shape and size of the battery. The adjustable range of the size and specifications of the PTC safety component is large. The connection methods of related components and wire harnesses, etc., become simple, the assembly is convenient, and automated production can be achieved. The material cost of the battery pack is reduced and the productivity is improved. Brief Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the PTC safety component of an embodiment of the present utility model.

[0019] Figure 2 It is a three-dimensional schematic diagram of the battery pack with the PTC safety component of an embodiment of the present utility model.

[0020] 100: Battery pack with PTC safety component

[0021] 1: PTC safety component

[0022] 2: Battery pack

[0023] 3: Single cell

[0024] 4: Pin

[0025] 5: Pin

[0026] 6: Insulating board

[0027] 7: Chip component

[0028] 8: Laminate

[0029] 9: Single cell Detailed Embodiment

[0030] Hereinafter, the detailed embodiments of the present utility model will be described in detail with reference to the drawings. The described embodiments are merely exemplary and can take various forms. In addition, the drawings disclosed in this specification are generally only schematic illustrations. That is, the dimensional ratios on the drawings are not necessarily the same as the actual dimensional ratios, and the dimensional ratios may not be the same among the drawings.

[0031] Hereinafter, with reference to the drawings, the detailed embodiments of the battery pack with the PTC safety component of the present utility model will be described.

[0032] Figure 1 It is a schematic diagram of the PTC safety component of an embodiment of the present utility model. Figure 2A perspective view of a battery pack with a PTC safety component according to an embodiment of the present utility model. A battery pack 100 with a PTC safety component has a battery pack 2 and a PTC safety component 1. The PTC safety component 1 has a chip component 7 and a laminate 8 connected by resistance welding. The laminate 8 is sequentially composed of a lead 4, an insulating plate 6, and another lead 5. The lead 4 is connected to the positive electrode of a single cell 3 by resistance welding, and the other lead 5 is connected to the negative electrode of another single cell 9 by resistance welding.

[0033] The battery pack 2 can be a lithium battery pack, a nickel-metal hydride battery pack, or other battery packs. The single cells 3 and 9 can be prefabricated with different widths, lengths, thicknesses, and shapes. Preferably, the cells 3 and 9 are cylindrical cells such as 18650 type, which have the characteristics of high monomer energy density, light weight, long life, and easy assembly.

[0034] The PTC safety component of the present utility model is a battery overcurrent protection sheet, simply referred to as a PTC safety component. The battery overcurrent protection sheet is also a protection device specifically used to prevent battery overheating caused by battery overcharging and over-discharging. Battery overheating is a problem that battery pack designers are most concerned about. Although there are overvoltage and overcurrent detection safety protection circuits in the battery pack, in the case where the voltage protection circuit fails and there is no temperature protection, the battery will generate excessive heat during overcharging or over-discharging, causing the battery to rupture, leak liquid, smoke, or even explode. The battery overcurrent protection sheet is connected in series with the original battery in the battery pack. Whether the temperature rise is caused by a short circuit or by overcharging or over-discharging, the device can play a protective role.

[0035] The PTC safety component of the present utility model has a chip component 7 and a laminate 8 connected by resistance welding. The laminate is sequentially composed of a lead 4, an insulating plate 6, and another lead 5. The leads are L-shaped leads, and the end of the short side is circular. The other lead is also an L-shaped lead, and the end of the short side is circular. The circular end of the short side of the above leads is connected to the positive or negative electrode of the single cell by resistance welding. The leads are nickel sheets.

[0036] The chip component of the bent PTC safety component is on the side of the battery pack. The chip component of the PTC is located on the side of the battery pack. This structure does not affect the overall installation of the PTC safety component even if the size of the chip component is large. In addition, the PTC safety component can be designed in a flat state according to the requirements of the specification.

[0037] The chip component is sequentially laminated by a conductive plate, a layer made of a polymer polymer raw material doped with a conductor, and a conductive plate layer. The conductive plate is preferably a nickel sheet.

[0038] A specific example of manufacturing a battery pack is made according to the following steps.

[0039] A battery pack composed of 4 series-connected nickel-metal hydride batteries in 2 groups of 2 sections. The PTC safety component used at the end of the battery pack is resistance-welded to the positive and negative electrodes of the battery respectively with two pins. After the resistance welding connection, the PTC safety component is bent along the side of the battery pack along the side of the battery. The bent PTC safety component is located between two adjacent battery sections.

[0040] The PTC safety component in the battery pack with the PTC safety component manufactured above has a single-sided double-pin structure. The pins of the PTC safety component are connected to the positive and negative electrodes of the battery, but the chip component of the PTC safety component is located on the side of the battery pack. This structure does not affect the overall installation of the PTC safety component even if the size of the chip component is large. This connection method is simpler than the structure with pins on both sides and can be directly connected to the positive and negative electrodes of the battery simultaneously, which is convenient for assembly. Using the safety component in this way, the structure of the related connecting components can be simplified, the overall cost is low, and the productivity is high.

[0041] The above describes the present utility model with the currently preferred embodiments, but the disclosed content should not be construed in a limiting manner. Various deformations and changes will be obvious to those skilled in the art in the technical field to which the present utility model pertains by reading the above disclosure. Therefore, without departing from the true spirit and scope of the present utility model, the appended claims should be construed to include all deformations and changes.

[0042] Industrial availability

[0043] The present utility model can provide a battery pack with a PTC safety component. Thus, the battery pack with a PTC safety component of the present utility model can be used as a power source for various devices, such as power sources for power tools, electric toys, electric bicycles, electric vehicles, electric skateboards, cordless telephones, etc., and backup power sources.

Claims

1. A battery pack with a PTC safety component, characterized in that: It has a battery pack and a PTC safety component, the PTC safety component has a chip component and a stacked body connected by resistance welding, the stacked body is composed of a pin, an insulating plate and another pin in sequence, the pin is connected to the positive electrode of a single battery by resistance welding, and the other pin is connected to the negative electrode of another single battery by resistance welding.

2. The battery pack with PTC safety components according to claim 1, characterized in that: The battery pack is a lithium battery pack or a nickel-metal hydride battery pack.

3. The battery pack with PTC safety components according to claim 1, characterized in that: The pin is a nickel sheet.

4. The battery pack with a PTC safety component according to claim 1, characterized in that: The pin is an L-shaped pin, and the end of the short side is round.

5. The battery pack with PTC safety components according to claim 1, characterized in that: The other pin is an L-shaped pin, and the end of the short side is rounded.

6. The battery pack with a PTC safety component according to claim 1, characterized in that: The bent chip component of the PTC safety component is on the side of the battery pack.

7. The battery pack with a PTC safety component according to claim 1, characterized in that: The chip components are sequentially stacked by a conductive plate, a layer made of a polymer macromolecular material mixed with a conductor, and a conductive plate.

8. The battery pack with a PTC safety component according to claim 1, characterized in that: The conductive plate is a nickel sheet.

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