Lithium battery protection device

Abstract

The utility model discloses a lithium battery protection device which comprises a lithium battery shell, the shell is provided with at least one heat dissipation opening, a sealing plate is arranged in the heat dissipation opening in a sliding mode, the sealing plate controls the sealing plate to move through an overheat protection unit, and when the temperature in the battery shell is too high, the overheat protection unit controls the sealing plate to move. The sealing plate moves to the heat dissipation opening, and air inside and outside circulates. When the lithium battery pack is not used, the sealing plate is kept in a closed state, so that the sealing performance of the battery shell is ensured, dust is prevented from entering, and the battery is protected from being influenced by the external environment. The overheating protection unit responds to the temperature change, the movement of the heat dissipation plate and the ventilation inside and outside the heat dissipation holes are automatically controlled when the first magnetic block moves, the heat dissipation efficiency is improved, and heat dissipation is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery technical field especially is lithium battery protection device. BACKGROUND

[0002] Lithium battery is a kind of widely used rechargeable battery type, is famous with its high energy density, long life and low self-discharge rate, and lithium battery pack generally includes shell, battery rack and lithium battery.

[0003] The patent document with the announcement number "CN215451541U" discloses a lithium battery that can dissipate heat, which realizes accelerated heat dissipation through a small-aperture through hole, but the aperture of the through hole is small, and the heat dissipation is limited, and the lithium battery cannot be sealed under general storage conditions and cannot prevent dust. UTILITY MODEL CONTENT

[0004] The utility model provides lithium battery protection device in the prior art, and it realizes large-scale heat dissipation by controlling the movement of sealing plate through overheating protection unit.

[0005] To solve the above technical problems, the utility model solves the problem by the following technical scheme: the lithium battery protection device includes a lithium battery shell, at least one heat dissipation port is arranged on the shell, a sealing plate is slidably arranged in the heat dissipation port, the movement of the sealing plate is controlled by an overheating protection unit, and when the temperature in the battery shell is too high, the sealing plate moves to the air flow between the inside and outside of the heat dissipation port.

[0006] In the above scheme, preferably, the overheating protection unit includes a temperature sensing component and a first magnetic block, a magnetic area is arranged on the sealing plate corresponding to the first magnetic block, and the same magnetic pole is arranged on the opposite side of the first magnetic block and the magnetic area.

[0007] In the above scheme, preferably, the sealing plate is connected to the inside of the lithium battery shell by a restoring spring.

[0008] In the above scheme, preferably, the temperature sensing component is a double-helix metal sheet, one end of the temperature sensing component is fixed in the shell, and the other end is connected to the first magnetic block.

[0009] In the above scheme, preferably, a placing groove is arranged in the lithium battery shell, and the temperature sensing component and the first magnetic block are arranged in the placing groove.

[0010] In the above scheme, preferably, a plurality of protection rods are arranged on the outside of the heat dissipation port, and the protection rods are evenly arranged in the heat dissipation port.

[0011] In the above scheme, preferably, the protection rods are arranged on both sides of the sealing plate.

[0012] Preferably, when the temperature sensing component drives the first magnetic block to move to one side of the magnetic area, the sealing plate moves against the restoring spring.

[0013] The utility model discious the following advantages: the lithium battery package is in the condition of not using, and the sealing plate keeps the closed state, ensures the sealing property of battery shell, prevents dust from entering, and protects the battery from the influence of external environment. The overheat protection unit responds to temperature change, and the first magnetic block moves to automatically control the movement of the heat dissipation plate, the air in and outside the heat dissipation hole circulates, improves the heat dissipation efficiency, and further improves heat dissipation. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a three-dimensional schematic view of the lithium battery shell without the sealing plate of the utility model.

[0015] Figure 2 It is a side view of the lithium battery shell without the sealing plate of the utility model.

[0016] Figure 3 It is Figure 2 A-A sectional view.

[0017] Figure 4 It is a state schematic view after installing the sealing plate of the utility model. DETAILED DESCRIPTION

[0018] The utility model will be described in further detail in combination with the drawings and specific implementation manners: refer to Figures 1-4 The lithium battery protection device comprises a lithium battery shell 1, and the lithium battery shell 1 comprises two parts, so that the lithium battery and the battery holder are arranged in the lithium battery shell 1.

[0019] In the embodiment, a heat dissipation port 2 for heat dissipation is arranged in the lower half of the shell, the heat dissipation port 2 is provided with at least one, and a sealing plate 3 is slidably arranged in the heat dissipation port 2, the sealing plate 3 can selectively close the heat dissipation port 2, and the sealing plate 3 keeps the sealing state during storage to prevent dust.

[0020] Further, the sealing plate 3 is moved when the temperature is too high, so that the sealing plate 3 is slid in the heat dissipation port 2, and a restoring spring 7 is arranged in the sealing plate 3 and the lithium battery shell 1, the sealing plate 3 keeps the sealing of the heat dissipation port 2 when the restoring spring 7 keeps in the static state.

[0021] Meanwhile, an overheat protection unit is arranged in the lithium battery shell 1, and the overheat protection unit is used to control the position of the sealing plate 3, that is, when the temperature in the lithium battery is normal, the sealing plate 3 is closed in the heat dissipation port 2, and the sealed working environment is realized.

[0022] The overheat protection unit comprises a temperature sensing component 6, which is located inside the lithium battery shell 1 and can sense the temperature inside the lithium battery. When the internal temperature is higher than a certain threshold, the overheat protection unit moves the sealing plate 3 to open the heat dissipation port 2, thereby accelerating heat dissipation.

[0023] Specifically, the overheat protection unit further comprises a first magnetic block 4 connected to the temperature sensing component 6. In this embodiment, a placement groove 8 is provided on the inner side of the lithium battery shell 1, and the first magnetic block 4 slides in the placement groove 8.

[0024] Meanwhile, the temperature sensing component 6 is preferably a double helix metal sheet, one end of which is fixed to the bottom of the shell, and the other end is connected to the first magnetic block 4. When the temperature in the lithium battery increases, the double helix metal sheet expands and contracts, i.e. the first magnetic block 4 is driven to descend.

[0025] Further, a magnetic area 5 is provided on the sealing plate 3, which is located in the middle of the side edge of the sealing plate 3. When the temperature sensing component 6 drives the first magnetic block 4 to move, the first magnetic block 4 is located on one side of the magnetic area 5, and the magnetic poles on the opposite sides of the magnetic area 5 and the first magnetic block 4 are the same. Under the action of the first magnetic block 4, the sealing plate 3 moves away from the first magnetic block 4, and when the sealing plate 3 moves, the restoring spring 7 is in a compressed state. That is, when the temperature in the battery shell reaches the set threshold in time, the sealing plate 3 moves into the heat dissipation port 2 to circulate air inside and outside, thereby accelerating heat dissipation.

[0026] Meanwhile, in this embodiment, the heat dissipation port 2 is provided with two heat dissipation ports 2, which are symmetrically arranged in the lithium battery shell 1, and are provided with one overheat protection device at the same time, which is used to accelerate heat dissipation.

[0027] Further, a plurality of protection rods 9 are arranged in the heat dissipation port 2, which are evenly arranged in the heat dissipation port 2, and preferably, the protection rods 9 are divided into two groups, which are located on both sides of the sealing plate 3, and can serve as sliding and guiding devices for the sealing plate 3. At the same time, when the sealing plate 3 is opened for heat dissipation, it can prevent accidental operation, and the protection rods 9 can also beautify the heat dissipation port 2.

[0028] The double helix metal sheet can work within a certain temperature difference. In this embodiment, when the temperature inside the lithium battery pack is greater than 38°, the double helix metal sheet is driven to move by contraction, and the first magnetic block 4 is located at the corresponding position of the magnetic area 5, thereby opening the sealing plate 3.

[0029] The above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some technical features therein can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A lithium battery protection device, characterized in that: The battery includes a lithium battery casing (1), the casing is provided with at least one heat dissipation vent (2), a sealing plate (3) is slidably disposed in the heat dissipation vent (2), the sealing plate (3) is controlled to move by an overheat protection unit, when the temperature inside the battery casing is too high, the sealing plate (3) moves to the heat dissipation vent (2) so that air can circulate inside and outside; The overheat protection unit includes a temperature sensing component (6) and a first magnetic block (4). A magnetic area (5) is provided on the sealing plate (3) corresponding to the first magnetic block (4). The first magnetic block (4) and the magnetic area (5) have the same magnetic pole on opposite sides.

2. The lithium battery protection device according to claim 1, characterized in that: The sealing plate (3) is connected inside the lithium battery casing (1) by a restoring spring (7).

3. The lithium battery protection device according to claim 1 or 2, characterized in that: The temperature sensing component (6) is a double-helix metal sheet, wherein one end of the temperature sensing component (6) is fixed in the outer shell and the other end is connected to the first magnetic block (4).

4. The lithium battery protection device according to claim 1, characterized in that: The lithium battery casing (1) is provided with a placement groove (8), which is used to place the temperature sensing component (6) and the first magnetic block (4).

5. The lithium battery protection device according to claim 1, characterized in that: Several protective rods (9) are provided on the outside of the heat dissipation port (2), and the protective rods (9) are evenly arranged in an array in the heat dissipation port (2).

6. The lithium battery protection device according to claim 5, characterized in that: The protective rod (9) is set on both sides of the sealing plate (3).

7. The lithium battery protection device according to claim 3, characterized in that: When the temperature sensing component (6) moves the first magnetic block (4) to one side of the magnetic area (5), the sealing plate (3) moves against the restoring spring (7).

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