Lithium battery cell capable of reducing overheating risk

Abstract

The utility model discloses a lithium battery cell capable of reducing overheating risk, which comprises a lithium battery cell, series metal sheets for transmitting current are respectively lapped on a positive electrode and a negative electrode at the upper part of the lithium battery cell, and an overheating prevention protection mechanism is arranged between the lithium battery cells. According to an originally supported lithium battery, due to the fact that a supporting piece is bent, a lithium battery cell directly slides down along a mounting hole and falls onto a second heat conduction plate, at the moment, the lithium battery cell slides off from a series metal sheet A, it is guaranteed that other lithium battery cells continue to work, and meanwhile the single lithium battery cell with the overheating problem is isolated.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery cores, and in particular to a lithium battery core with reduced overheating risk. Background Art

[0002] The batteries used in new energy equipment and devices on the market, such as mobile tools, bicycles, motorcycles, electric vehicles or energy storage systems, can be composed of multiple battery cells connected in series. Therefore, the working safety of the battery cells is the basis for ensuring the safety of the battery and thus the safety of new energy equipment and devices or energy storage systems.

[0003] Existing lithium battery overheating usually uses a temperature fuse to implement overheat protection for the battery cell. Although this protection method is effective, it is impossible to know which lithium battery cell has a problem.

[0004] Therefore, in view of the above problems, the present invention proposes a lithium battery cell with reduced overheating risk. Utility Model Content

[0005] The purpose of the utility model is to solve the problem that the existing lithium battery overheats because the temperature fuse is often used to implement overheat protection of the battery core. Although this protection method is effective, it is impossible to know which lithium battery cell has the overheating problem.

[0006] Therefore, based on the above-mentioned problem, the utility model proposes a lithium battery cell with reduced overheating risk, including a lithium battery cell, wherein the positive and negative poles on the upper part of the lithium battery cell are respectively overlapped with series metal sheets for transmitting current, and an overheating protection mechanism is provided between the lithium battery cells.

[0007] Preferably: the overheating protection mechanism includes: a connecting plate, a plurality of mounting holes are provided inside the connecting plate, a lithium battery cell that can slide up and down is placed in each mounting hole, a plurality of supporting feet are also integrally fixedly provided at the lower part of the connecting plate, and the mounting positions of the supporting feet are located on both sides of the mounting holes, a deformable supporting sheet is provided in the middle of each supporting foot, the lithium battery cell is placed on the upper part of the supporting sheet, and the supporting force is given by the supporting sheet, and the mounting height of the supporting sheet is lower than the height of the connecting plate.

[0008] Preferably: a plurality of vertical heat conducting plates 1 are fixedly installed between the mounting holes provided inside the connecting plate, a horizontal heat conducting plate 2 is integrally fixedly connected to the lower part of the heat conducting plate, a heat dissipation fin is bonded to the lower part of the heat conducting plate 2 with silicone grease, the installation height of the heat conducting plate 2 is lower than the installation height of the lithium battery cell, and the left and right sides of the heat conducting plate 1 are respectively in contact with the lithium battery cells.

[0009] Preferably, the support sheet is L-shaped, one end of which is fixed in the support leg by screws, and a lithium battery cell is placed on the other end, and the support sheet is composed of a thermal bimetallic sheet that bends downward when heated.

[0010] Preferably, one side of the heat dissipation fins can be used in conjunction with an existing heat dissipation fan for cooling.

[0011] Beneficial effect: When the lithium battery cell is overheated during use, the originally supported lithium battery will slide down along the mounting hole directly due to the bending of the support sheet and fall onto the second heat conducting plate. At this time, the lithium battery cell will be disconnected from the series metal sheet A when it slides down, ensuring that other lithium battery cells continue to work while isolating the single lithium battery cell with overheating problem.

[0012] By providing heat conducting plate one and heat conducting plate two, the lithium battery cells can transfer heat to the heat dissipation fins and then be assisted in cooling by an external fan. In addition, the lithium battery cells falling onto heat conducting plate two can also directly contact with heat conducting plate two better, thereby increasing the heat conduction area and facilitating faster heat dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a rear view schematic diagram of the overall structure of the utility model;

[0014] Figure 2 It is an exploded schematic diagram of the overall structure of the utility model;

[0015] Figure 3 This is a cross-sectional schematic diagram of the internal structure of the connecting plate of the utility model;

[0016] Reference Figures 1 to 3 The reference numerals are: connecting plate 1, supporting leg 101, mounting hole 102, heat conducting plate 1 103, heat conducting plate 2 104, heat dissipating fin 105, supporting plate 2, lithium battery cell 3, and series metal plate A. DETAILED DESCRIPTION

[0017] 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.

[0018] Reference Figures 1 to 3 A lithium battery cell with reduced overheating risk includes a lithium battery cell 3, wherein the positive and negative electrodes on the upper part of the lithium battery cell 3 are respectively overlapped with series metal sheets 301 for transmitting current, and an overheating protection mechanism is provided between the lithium battery cells 3 and the lithium battery cells 3.

[0019] Preferably: the overheat protection mechanism comprises: a connecting plate 1, a plurality of mounting holes 102 are arranged inside the connecting plate 1, a lithium battery cell 3 which can slide up and down is placed in each mounting hole 102, a plurality of legs 101 are fixedly arranged in an integrated manner at the lower part of the connecting plate 1, and the mounting position of the legs 101 is located on both sides of the mounting hole 102, a deformable support sheet 2 is arranged in the middle part of each leg 101, the lithium battery cell 3 is placed on the upper part of the support sheet 2, and the support force is given by the support sheet 2, the mounting position height of the support sheet 2 is lower than the height of the connecting plate 1, a visual sensor is fixedly installed on the leg 101, and is electrically connected to an external control system, so as to observe whether the lithium battery cell 3 slides down, the support sheet 2 is L-shaped, one end of which is fixedly installed in the leg 101 by screws, and a lithium battery cell 3 is placed on the upper part of the other end, and the support sheet 2 is made of The thermal bimetallic strip will bend downward when heated. Under normal conditions, the thermal bimetallic strip will not bend at the temperature generated by normal use of the lithium battery. When the lithium battery cell 3 is overheated during use, the lithium battery cell 3 with a larger amount of heat will transfer the heat to the lower support sheet 2 for support. Since the support sheet 2 is composed of a thermal bimetallic strip that bends downward when heated, when the support sheet 2 bends when heated, the lithium battery cell 3 originally supported will slide down along the mounting hole 102 directly and fall onto the heat conducting plate 2 104 due to the bending of the support sheet 2. In addition, due to the sliding of the lithium battery cell 3, the originally overlapped series metal sheets A will also disconnect. At this time, while ensuring that other lithium battery cells 3 continue to work, a single lithium battery cell 3 with an overheating problem is isolated.

[0020] Preferably: a plurality of vertical heat conducting plates 103 are fixedly installed between the mounting holes 102 and the mounting holes 102 provided inside the connecting plate 1, and a horizontal heat conducting plate 2 104 is integrally fixedly connected to the lower part of the heat conducting plate 103, and a heat dissipation fin 105 is bonded to the lower part of the heat conducting plate 2 104 with silicone grease, and the installation height of the heat conducting plate 2 104 is lower than the installation height of the lithium battery cell 3, and the heat conducting plate 2 104 and the heat conducting plate 1 103 are made of alumina ceramics with good insulation performance and strong thermal conductivity. The left and right sides of the heat conducting plate 1 103 are in contact with the lithium battery cell 3 respectively, and by providing the heat conducting plate 1 103 and the heat conducting plate 2 104 between the lithium battery cell 3 and the lithium battery cell 3, when the lithium battery cell 3 generates heat, a large amount of heat can be introduced into the heat conducting plate 1 103 and the heat conducting plate 2 104, and then an external fan is used for auxiliary cooling.

[0021] Preferably, one side of the heat dissipation fin 105 can be used in conjunction with an existing heat dissipation fan for cooling.

[0022] Working principle:

[0023] When the lithium battery cell 3 is overheated during use, the lithium battery cell 3 with greater heat will transfer the heat to the support sheet 2 at the bottom. Since the support sheet 2 is composed of a thermal bimetallic sheet that bends downward when heated, when the support sheet 2 bends due to heat, the lithium battery cell 3 originally supported will slide down along the mounting hole 102 and fall onto the heat conducting plate 2 104 due to the bending of the support sheet 2. In addition, due to the sliding of the lithium battery cell 3, the originally overlapped series metal sheet A will also be disconnected, thereby ensuring that the other lithium battery cells 3 continue to work. When the lithium battery cell 3 has an overheating problem, a single lithium battery cell 3 with an overheating problem is isolated, and the visual sensor can be used to inform the user which specific lithium battery cell 3 has a problem. In addition, by providing a heat conducting plate 103 and a heat conducting plate 2 104 between the lithium battery cells 3, when the lithium battery cells 3 generate heat, a large amount of heat can be introduced into the heat conducting plate 103 and the heat conducting plate 2 104, and then an external fan is used to assist in cooling. In addition, the lithium battery cells 3 that fall onto the heat conducting plate 2 104 can also directly contact the heat conducting plate 2 104 better, thereby increasing the heat conduction area and facilitating faster heat dissipation.

[0024] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A lithium battery cell with reduced overheating risk, comprising a lithium battery cell (3), wherein the positive and negative electrodes on the upper part of the lithium battery cell (3) are respectively connected with series metal sheets (301) for transmitting current, and wherein: An overheat protection mechanism is provided between the lithium battery cells (3) and the lithium battery cells (3).

2. A lithium battery cell with reduced overheating risk according to claim 1, characterized in that: The overheat protection mechanism comprises: a connecting plate (1), the connecting plate (1) having a plurality of mounting holes (102) inside, each mounting hole (102) being provided with a lithium battery cell (3) that can slide up and down, a plurality of supporting legs (101) being integrally fixedly provided at the lower part of the connecting plate (1), and the mounting positions of the supporting legs (101) being located at both sides of the mounting hole (102), a deformable supporting sheet (2) being provided at the middle part of each supporting leg (101), the lithium battery cell (3) being placed on the upper part of the supporting sheet (2), and being provided with a supporting force by the supporting sheet (2), and the mounting position height of the supporting sheet (2) being lower than the height of the connecting plate (1).

3. A lithium battery cell with reduced overheating risk according to claim 2, characterized in that: A plurality of vertical heat conducting plates (103) are fixedly mounted between the mounting holes (102) provided inside the connection plate (1), and a horizontal heat conducting plate (104) is integrally fixedly connected to the lower portion of the heat conducting plate (103). A heat dissipation fin (105) is bonded to the lower portion of the heat conducting plate (104) with silicone grease. The installation height of the heat conducting plate (104) is lower than the installation height of the lithium battery cell (3), and the left and right sides of the heat conducting plate (103) are in contact with the lithium battery cell (3) respectively.

4. A lithium battery cell with reduced overheating risk according to claim 3, characterized in that: The support sheet (2) is L-shaped, one end of which is fixedly mounted in the support leg (101) by means of screws, and a lithium battery cell (3) is placed on the other end, and the support sheet (2) is composed of a thermal bimetallic sheet that bends downward when heated.

5. The lithium battery cell with reduced overheating risk according to claim 4, characterized in that: One side of the heat dissipation fin (105) can be used in conjunction with an existing heat dissipation fan for cooling.

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