Self-heating secondary battery
By setting up an intermediate insulating sheet in the connection assembly of the self-heating secondary battery, the battery short circuit problem caused by shorting between the poles is solved, ensuring that the battery operates normally in a low-temperature environment.
Patent Information
- Application Number
- CN202420167742.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-24
- Publication Date
- 2025-03-07
- Estimated Expiration
- 2034-01-24
AI Technical Summary
In low-temperature environments, existing self-heating batteries may cause short circuits to occur due to short connection between the electrodes, affecting the normal operation of the battery.
A self-heating secondary battery is designed to ensure that the positive electrode terminal is insulated and connected to the heating terminal by providing an intermediate insulating sheet in the connection assembly to avoid shorting between the electrodes.
It effectively avoids the risk of battery short circuit caused by short-circuit of the electrode, and ensures that the battery operates normally in a low-temperature environment.
Smart Images
Figure CN222581463U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of lithium ion batteries, in particular to a self-heating secondary battery. Background Art
[0002] With the development of new energy, the requirements for energy density of existing batteries are further improved. New energy power batteries are usually secondary batteries, which means that after the battery is discharged, the active material can be activated by charging and the battery can continue to be used.
[0003] It is well known that the performance of batteries will be limited in low temperature environments. At low temperatures, battery charging and discharging becomes difficult, capacity attenuation is large, internal resistance becomes larger, peak power decreases, and cycle life is reduced. To solve this problem and ensure that the battery pack works normally in a low temperature environment, the current method is to use the battery's own electrical energy to heat the battery to achieve battery self-heating.
[0004] In order to reduce the heat loss caused by resistance, the distance between the heating end and the pole end of the self-heating battery will be shortened. Therefore, there is a risk of short circuit between adjacent pole ears, causing battery short circuit.
[0005] To this end, we propose a self-heating secondary battery to solve the problem of short circuit risk between the tabs. Utility Model Content
[0006] The purpose of the utility model is to solve the shortcomings of the prior art. In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0007] A self-heating secondary battery comprises a bare cell, a top cover and a connecting assembly; a pole ear is arranged on the side of the bare cell, a connecting assembly is installed on the bottom of the top cover, and the connecting assembly is connected to the pole ear of the bare cell; the connecting assembly comprises a connecting piece 1, a connecting piece 2, an intermediate insulating piece and a connecting piece 3; the intermediate insulating piece is arranged between the connecting piece 2 and the connecting piece 3, and the connecting piece 2 and the connecting piece 3 are insulated and connected; the connecting piece 1 is connected to the negative terminal of the top cover, the connecting piece 2 is connected to the positive terminal of the top cover, the connecting piece 3 is connected to the heating end of the top cover, and the intermediate insulating piece is connected between the positive terminal and the heating end, and the insulating connection between the positive terminal and the heating end is ensured by the intermediate insulating piece, so as to effectively avoid the risk of battery short circuit due to short circuit of adjacent pole ears.
[0008] Further preferably, the connecting piece three is arranged between the connecting piece one and the connecting piece two, and the distance between the connecting piece three and the connecting piece one is greater than the distance between the connecting piece three and the connecting piece two.
[0009] Further preferably, a lap block 1 is extended from one side of the middle insulating sheet, a cylinder is arranged on the lap block 1, a pair of lap blocks 2 are arranged on the side of the middle insulating sheet opposite to the lap block 1, and a trapezoidal block is arranged on the lap block 2.
[0010] Further preferably, a circular hole matching with the cylinder is opened on the second connecting piece.
[0011] Further preferably, the connecting piece three is provided with a trapezoidal groove matching with the trapezoidal block.
[0012] Further preferably, blind holes connected to the top cover are punched on the connecting piece 1, the connecting piece 2 and the connecting piece 3, and the surfaces of the blind holes are provided with embossed structures.
[0013] Further preferably, the pole lug includes pole lug one, pole lug two and pole lug three which are fixedly connected to connecting sheet one, connecting sheet two and connecting sheet three in sequence.
[0014] Compared with the prior art, the beneficial effects of the utility model are:
[0015] The utility model arranges an intermediate insulating sheet between adjacent pole ears, and ensures the insulation connection of adjacent pole ears through the intermediate insulating sheet, thereby effectively avoiding the risk of battery short circuit caused by short connection of adjacent pole ears. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is the front view of the utility model;
[0017] Figure 2 It is a three-dimensional structural schematic diagram of the utility model;
[0018] Figure 3 This is a schematic diagram of the front assembly of the connection components;
[0019] Figure 4 This is a schematic diagram of the back assembly of the connection component;
[0020] Figure 5 This is a front exploded view of the connection assembly;
[0021] Figure 6 This is an exploded view of the back side of the connection component.
[0022] In the figure: bare cell 1, top cover 2, connecting piece 1 3, pole ear 1 11, pole ear 2 12, pole ear 3 13, connecting piece 2 4, middle insulating piece 5, connecting piece 3 6, circular hole 41, trapezoidal groove 61, lap block 1 51, cylinder 52, lap block 2 53, trapezoidal block 54. DETAILED DESCRIPTION
[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.
[0024] Reference Figure 1-Figure 6 A self-heating secondary battery comprises a bare cell 1, a top cover 2 and a connecting assembly; the bare cell 1 is provided with a pole ear on the side, the top cover 2 is installed with a connecting assembly at the bottom, and the connecting assembly is connected to the pole ear of the bare cell 1; the connecting assembly comprises a connecting sheet 1 3, a connecting sheet 2 4, an intermediate insulating sheet 5 and a connecting sheet 3 6; the intermediate insulating sheet 5 is arranged between the connecting sheet 2 4 and the connecting sheet 3 6 to insulate and connect the connecting sheet 2 4 and the connecting sheet 3 6.
[0025] In some embodiments: connecting piece 1 3 is connected to the negative terminal of the top cover 2, connecting piece 2 4 is connected to the positive terminal of the top cover 2, connecting piece 3 6 is connected to the heating end of the top cover 2, and the middle insulating piece 5 is connected between the positive terminal and the heating end. The middle insulating piece ensures that the positive terminal and the heating end are insulated and connected, effectively avoiding the risk of battery short circuit due to short circuit of adjacent tabs.
[0026] The connecting piece three 6 is arranged between the connecting piece one 3 and the connecting piece two 4 , and the distance between the connecting piece three 6 and the connecting piece one 3 is greater than the distance between the connecting piece three 6 and the connecting piece two 4 .
[0027] In some embodiments: connecting piece three 6 is connected to the heating end of the top cover 2, connecting piece one 3 is connected to the negative end of the top cover 2, connecting piece two 4 is connected to the positive end of the top cover 2, and the distance between the heating end and the negative end is greater than the distance between the heating end and the positive end, that is, the heating end is installed close to the positive end, shortening the distance between the heating end and the positive end of the self-heating battery, thereby reducing the heat loss caused by resistance.
[0028] A lap block 51 is extended from one side of the intermediate insulating sheet 5, and a cylinder 52 is arranged on the lap block 1 51. A pair of lap blocks 53 are arranged on the opposite side of the intermediate insulating sheet 5 and the lap block 1 51, and a trapezoidal block 54 is arranged on the lap block 2 53; a circular hole 41 cooperating with the cylinder 52 is opened on the connecting sheet 2 4; a trapezoidal groove 61 cooperating with the trapezoidal block 54 is arranged on the connecting sheet 3 6.
[0029] In some embodiments: the overlap block 1 51 is overlapped on the connecting piece 2 4, and then fixed by clamping the cylinder 52 with the circular hole 41; the overlap block 2 53 is overlapped on the connecting piece 3 6, and fixed by clamping the trapezoidal block 54 with the trapezoidal groove 61; the two sides of the middle insulating sheet 5 are fixed by clamping with the connecting piece 2 4 and the connecting piece 3 6 respectively.
[0030] In other embodiments, the two sides of the middle insulating sheet 5 can also be fixed to the second connecting sheet 4 and the third connecting sheet 6 respectively by welding, bolts or any other method that can connect the two.
[0031] Blind holes connected to the top cover 2 are punched on the connecting piece 1 3 , the connecting piece 2 4 and the connecting piece 3 6 , and the surfaces of the blind holes are provided with embossed structures.
[0032] In some embodiments, the blind hole on the connecting sheet is connected to the pole on the top cover 2 by laser, and the embossed structure on the surface of the blind hole plays a role in preventing laser welding from reflecting light.
[0033] The pole lugs include pole lug 1 11 , pole lug 2 12 and pole lug 3 13 which are fixedly connected to connecting piece 1 3 , connecting piece 2 4 and connecting piece 3 6 in sequence.
[0034] In some embodiments: the first pole ear 11 is the negative pole ear, the second pole ear 12 is the positive pole ear, the third pole ear 13 is the heating pole ear, the negative pole ear is connected to the negative terminal through the connecting piece 1 3, the positive pole ear is connected to the positive terminal through the connecting piece 2 4, and the heating pole ear is connected to the heating end through the connecting piece 3 6.
[0035] The utility model arranges an intermediate insulating sheet between adjacent pole ears, and ensures the insulation connection of adjacent pole ears through the intermediate insulating sheet, thereby effectively avoiding the risk of battery short circuit caused by short connection of adjacent pole ears.
Claims
1. A self-heating secondary battery, characterized in that: It includes a bare cell, a top cover and a connecting assembly; the bare cell is provided with a pole ear on the side, the connecting assembly is installed at the bottom of the top cover, and the connecting assembly is connected to the pole ear of the bare cell; The connection assembly includes a connection piece 1, a connection piece 2, an intermediate insulating piece and a connection piece 3; the intermediate insulating piece is arranged between the connection piece 2 and the connection piece 3 to insulate and connect the connection piece 2 and the connection piece 3.
2. A self-heating secondary battery according to claim 1, characterized in that: The connecting piece three is arranged between the connecting piece one and the connecting piece two, and the distance between the connecting piece three and the connecting piece one is greater than the distance between the connecting piece three and the connecting piece two.
3. A self-heating secondary battery according to claim 1, characterized in that: A lap block 1 is extended from one side of the middle insulating sheet, a column is arranged on the lap block 1, a pair of lap blocks 2 are arranged on the side opposite to the lap block 1 of the middle insulating sheet, and a trapezoidal block is arranged on the lap block 2.
4. A self-heating secondary battery according to claim 3, characterized in that: The second connecting piece is provided with a round hole which matches with the cylinder.
5. A self-heating secondary battery according to claim 3, characterized in that: The connecting piece three is provided with a trapezoidal groove which matches with the trapezoidal block.
6. A self-heating secondary battery according to claim 3, characterized in that: Blind holes connected to the top cover are punched on the connecting piece 1, the connecting piece 2 and the connecting piece 3, and the surfaces of the blind holes are provided with embossed structures.
7. A self-heating secondary battery according to claim 1, characterized in that: The pole lugs include pole lug 1, pole lug 2 and pole lug 3 which are fixedly connected to connecting sheet 1, connecting sheet 2 and connecting sheet 3 in sequence.