Explosion-proof valve exhaust channel and battery pack
By designing an explosion-proof valve exhaust channel including exhaust passage, gas collection passage and exhaust port, the sealing baffle made of high-strength polycarbonate melts at high temperature and opens the sealing block to achieve rapid discharge of exhaust gas, solving the problem that high-temperature, high-pressure, and high-polluting and high-polluting gases in existing battery packs cannot be effectively isolated, and thermoelectric separation and prevention of secondary pollution are achieved.
Patent Information
- Application Number
- CN202421431530.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-21
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2034-06-21
AI Technical Summary
In the existing battery pack, the exhaust passage of the battery cell explosion-proof valve cannot effectively isolate the high-temperature, high-pressure and high-polluting gas, causing the gas to come into contact with the electrical parts, causing secondary damage and more serious consequences.
An explosion-proof valve exhaust passage is designed, including an exhaust passage, an air collection passage and an exhaust port. A sealing system is formed through a sealing baffle and a sealing block. The sealing baffle made of high-strength polycarbonate melts at high temperatures, and the sealing block is pushed open to achieve rapid exhaust gas discharge.
The timely export of high-temperature and high-pressure exhaust gas is achieved, which prevents the spread of exhaust gas in the battery pack, and achieves thermoelectric separation, prevents secondary pollution and damage, and the sealing block can be recycled and reused.
Smart Images
Figure CN222775527U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of battery packs, and in particular relates to an explosion-proof valve exhaust channel and a battery pack. Background Art
[0002] When thermal runaway occurs in the battery cells inside the battery pack, the battery cell explosion-proof valves will be pushed open by the high-temperature and high-pressure gases, and the gases inside the battery cells will erupt. The exhaust channels of the battery cell explosion-proof valves in existing battery packs can only serve as a confluence, and do not isolate the high-temperature, high-pressure and highly polluted gases generated by the thermal runaway of the battery cells. As a result, the gases will come into contact with electrical components (high and low voltage wiring harnesses, etc.), causing secondary damage to the battery pack and resulting in more serious and worse consequences. Utility Model Content
[0003] The purpose of the utility model is to provide an explosion-proof valve exhaust channel and a battery pack, which can timely guide out high-temperature and high-pressure exhaust gas, prevent the exhaust gas discharged from the battery cell explosion-proof valve from spreading in the battery pack, realize thermal and electrical separation, and effectively avoid secondary pollution.
[0004] To achieve the above-mentioned purpose, the utility model discloses an explosion-proof valve exhaust channel, comprising an exhaust channel, one side of the exhaust channel has air collecting channels connected to the exhaust channel evenly distributed along the length direction of the exhaust channel, and the other side of the exhaust channel is provided with an exhaust port, a sealing block is installed in the exhaust port through a sealing baffle, and the outer surface of the sealing block is in contact with the inner wall of the exhaust port.
[0005] As a further solution of the utility model: annular grooves are correspondingly provided on the outer surface of the sealing block and the inner wall of the exhaust port, and the sealing baffle is embedded and installed in the annular groove.
[0006] As a further solution of the utility model: the sealing baffle is made of high-strength polycarbonate.
[0007] To achieve the above-mentioned purpose, the utility model provides a battery pack on the other hand, including a tray, end plates are provided at both ends of the tray, a number of battery cells are evenly arranged between the two end plates, battery cell end faces are provided with battery cell explosion-proof valves and battery cell poles, the tray is provided with a box cover covering the end plates and the battery cells, and also includes the above-mentioned explosion-proof valve exhaust channel.
[0008] As a further solution of the utility model: the gas collecting channels correspond one to one with the explosion-proof valves of the battery cells, and the box cover is provided with a notch for accommodating the exhaust port.
[0009] As a further solution of the utility model: the gas collecting channel and the battery core, and the box cover and the exhaust port are connected by structural adhesive to form a seal.
[0010] Compared with the prior art, the beneficial effects of the utility model are as follows:
[0011] The exhaust port of the exhaust channel forms a sealing system through a sealing baffle and a sealing block. When there is no high-temperature and high-pressure exhaust gas in the exhaust channel, the sealing system will remain sealed to prevent external impurities from entering the exhaust channel and contaminating the surface of the battery cell;
[0012] When the battery pack experiences thermal runaway, the explosion-proof valve of the battery cell opens and high-temperature and high-pressure exhaust gas is ejected. The exhaust gas is gathered in the gas collecting channel and instantly melted in the exhaust channel. The sealing baffle made of high-strength polycarbonate is pushed outward, and the exhaust gas is discharged to the outside to avoid contact with the electrical components in the battery pack, thus achieving thermal and electrical separation and causing secondary pollution and damage.
[0013] In addition, the ejected sealing block can be recycled and reused. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the exhaust passage structure of the explosion-proof valve.
[0015] Figure 2 It is a schematic diagram of the local explosion structure of the exhaust channel of the explosion-proof valve.
[0016] Figure 3 It is a schematic diagram of the battery pack structure with an explosion-proof valve exhaust channel installed.
[0017] Figure 4 yes Figure 3 Schematic diagram of the internal structure.
[0018] In the figure: 1. exhaust channel, 2. sealing block, 3. exhaust port, 4. gas collecting channel, 5. annular groove, 6. sealing baffle, 7. tray, 8. box cover, 8.1, notch, 9. end plate, 10. battery cell, 11. battery cell explosion-proof valve, 12. battery cell pole. DETAILED DESCRIPTION
[0019] The utility model will be further described below in conjunction with the accompanying drawings.
[0020] like Figure 1 and Figure 2 As shown, the exhaust channel of the explosion-proof valve includes an exhaust channel 1, and an air collecting channel 4 connected to the exhaust channel 1 is evenly spaced along the length direction of the exhaust channel 1 on one side of the exhaust channel 1, and an exhaust port 3 is provided on the other side of the exhaust channel 1. A sealing block 2 is installed in the exhaust port 3 through a sealing baffle 6, and the outer surface of the sealing block 2 is in contact with the inner wall of the exhaust port 3.
[0021] The sealing block 2 cooperates with the sealing baffle 6 to form a sealing system at the exhaust port 3 , which can effectively prevent external impurities from entering the exhaust channel 1 through the exhaust port 3 and then contaminating the surface of the battery cell 10 .
[0022] In order to ensure the sealing effect achieved by the sealing block 2 and the sealing baffle 6 , preferably, an annular groove 5 is correspondingly provided on the outer surface of the sealing block 2 and the inner wall of the exhaust port 3 , and the sealing baffle 6 is embedded and installed in the annular groove 5 .
[0023] In order to be able to push open the sealing block 2 at the moment the exhaust gas arrives and discharge the exhaust gas quickly, the sealing baffle 6 is further made of high-strength polycarbonate. The temperature of the exhaust gas ejected from the battery cell explosion-proof valve 11 is 600-900°C, and the melting point of high-strength polycarbonate is 220°C. The sealing baffle 6 made of it can be instantly melted by the exhaust gas when it comes into contact with the exhaust gas, and then the exhaust gas will push open the sealing block 2 and discharge the exhaust gas to the outside.
[0024] The utility model also provides a battery pack, including a tray 7, end plates 9 are provided at both ends of the tray 7, a number of battery cells 10 are evenly arranged between the two end plates 9, the end faces of the battery cells 10 are provided with battery cell explosion-proof valves 11 and battery cell poles 12, the tray 7 is provided with a box cover 8 covering the end plates 9 and the battery cells 10, and also includes the above-mentioned explosion-proof valve exhaust channel.
[0025] Furthermore, the gas collecting channel 4 corresponds to the battery cell explosion-proof valve 11 one by one, and the box cover 8 is provided with a notch 8.1 for accommodating the exhaust port 3, so that the explosion-proof valve exhaust channel can be stably installed on the battery pack.
[0026] Furthermore, the gas collecting channel 4 and the battery cell 10, and the box cover 8 and the exhaust port 3 are connected by structural adhesive to form a seal, ensuring that there is no gap, which is more conducive to the exhaust gas being discharged through the exhaust port 3, avoiding secondary pollution in the battery pack.
[0027] The working process of the utility model is as follows: when thermal runaway does not occur inside the battery pack and the battery cell explosion-proof valve 11 does not spray high-temperature gas, the sealing block 2 and the sealing baffle 6 together form a sealing system, which can prevent impurities from entering the battery pack and the exhaust channel 1, so as to avoid polluting the environment inside the battery pack and affecting the exhaust efficiency; and when the battery cell explosion-proof valve 11 sprays high-temperature gas due to thermal runaway of the battery cell 10, the sealing baffle 6 will melt itself due to the high temperature, thereby losing the restraining effect on the sealing block 2, and the high-pressure gas will immediately push open the sealing block 2, thereby realizing the smooth discharge of high-temperature and high-pressure exhaust gas.
Claims
1. An explosion-proof valve exhaust passage, comprising an exhaust passage (1), characterized in that: On one side of the exhaust channel (1), there are evenly spaced gas collecting channels (4) connected to the exhaust channel (1) along the length direction of the exhaust channel (1); on the other side of the exhaust channel (1), there is an exhaust port (3); a sealing block (2) is installed in the exhaust port (3) via a sealing baffle (6); the outer surface of the sealing block (2) is in contact with the inner wall of the exhaust port (3).
2. The explosion-proof valve exhaust passage according to claim 1, characterized in that: The outer surface of the sealing block (2) and the inner wall of the exhaust port (3) are correspondingly provided with an annular groove (5), and the sealing baffle (6) is embedded and installed in the annular groove (5).
3. The explosion-proof valve exhaust passage according to claim 1 or 2, characterized in that: The sealing baffle (6) is made of high-strength polycarbonate.
4. A battery pack, comprising a tray (7), end plates (9) being provided at both ends of the tray (7), a plurality of cells (10) being arranged evenly between the two end plates (9), cell explosion-proof valves (11) and cell poles (12) being provided at the end faces of the cells (10), a box cover (8) covering the end plates (9) and the cells (10) being provided on the tray (7), characterized in that: It also includes the explosion-proof valve exhaust channel according to any one of claims 1-3.
5. The battery pack according to claim 4, characterized in that: The gas collecting channels (4) correspond one to one with the battery core explosion-proof valves (11), and the box cover (8) is provided with a notch (8.1) for accommodating the exhaust port (3).
6. The battery pack according to claim 5, characterized in that: The gas collecting channel (4) and the battery core (10), as well as the box cover (8) and the exhaust port (3) are connected by structural adhesive to form a seal.