Pressure balancing unit for battery and battery
By introducing a breathable waterproof membrane and weakened area into the battery pressure balance unit, the problem of rapid release when the internal pressure rises is solved, and the safety and stability of the battery are improved.
Patent Information
- Application Number
- CN202422116566.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-29
- Publication Date
- 2025-09-02
- Estimated Expiration
- 2034-08-29
AI Technical Summary
When the internal pressure of existing batteries suddenly rises, it is difficult to release air pressure quickly and safely, which poses safety risks.
A pressure balance unit is designed, including a breathable waterproof membrane and a weakened area. The breathable waterproof membrane prevents water vapor from entering under normal circumstances. When the internal pressure rises, the weakened area is preferred to achieve rapid pressure release.
Improves the stability and safety of the battery system, ensuring rapid and efficient release of gas at high pressures, avoiding safety accidents, with small flow resistance and no need for additional mechanisms to puncture the compartment.
Smart Images
Figure CN223296991U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of batteries, and more particularly, to a pressure balancing unit for a battery and a battery. Background Art
[0002] Batteries, such as those used in new energy vehicles, typically include a housing and battery components within the housing. The interior of the battery housing is typically connected to the outside via a pressure-balancing unit. This unit features a breathable, waterproof membrane that allows gas to pass while inhibiting liquid flow, thereby maintaining pressure within the battery housing while protecting the battery components from moisture. If a battery component malfunctions, a large amount of gas is generated, causing a sudden increase in pressure within the housing. This pressure must be quickly released to prevent a safety hazard. Utility Model Content
[0003] The purpose of this application is to solve or at least alleviate the problems existing in the prior art.
[0004] According to some aspects of the present application, there is provided a pressure balancing unit for a battery, comprising:
[0005] a body defining a mounting portion and a passage, the mounting portion being configured to be connected to the battery, and the passage communicating between the interior and exterior of the battery;
[0006] The pressure balancing unit further includes an isolator arranged in the channel, the isolator having a first area and a second area, wherein one of the first area and the second area is a breathable waterproof membrane, and the other of the first area and the second area is a weakened area, so that when the internal pressure of the battery increases rapidly, the weakened area is destroyed before the breathable waterproof membrane.
[0007] Optionally, in an embodiment of the pressure balancing unit, the first region surrounds the second region.
[0008] Optionally, in an embodiment of the pressure balancing unit, the first region is annular, the second region is circular, and the first region and the second region are concentrically arranged.
[0009] Optionally, in an embodiment of the pressure balancing unit, the partition spans the channel.
[0010] Optionally, in an embodiment of the pressure balancing unit, the first region is the weakened region, the second region is connected to the first region by welding, molding or bonding, and the first region is connected to the channel of the body by welding, molding or bonding.
[0011] Optionally, in an embodiment of the pressure balancing unit, the second region is the weakened region, and the second region is connected to the first region by welding, molding or bonding.
[0012] Optionally, in an embodiment of the pressure balancing unit, the interior of the channel has a stepped portion, and the first region is attached to the stepped portion.
[0013] Optionally, in an embodiment of the pressure balancing unit, the weakened area is a metal foil, a plastic thin layer or a rubber thin layer.
[0014] Optionally, in an embodiment of the pressure balancing unit, the mounting portion is configured to have an external thread and / or a snap fastener.
[0015] A battery is also provided, comprising:
[0016] a housing defining a cavity and a port;
[0017] a battery component disposed in the cavity; and
[0018] A pressure balancing unit according to various embodiments is mounted to a port of the housing.
[0019] The pressure balancing unit according to the present application can quickly release pressure when a large amount of gas is generated in the internal parts of the battery. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The disclosure of this application will be more easily understood with reference to the accompanying drawings. Those skilled in the art will readily appreciate that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this application. Furthermore, similar numbers in the figures represent similar components, where:
[0021] Figure 1 shows a cross-sectional view of a battery according to an embodiment;
[0022] Figure 2 and Figure 3 respectively showing three-dimensional views of a pressure balancing unit according to an embodiment at different angles; and
[0023] Figure 4 A perspective view of a pressure balancing unit according to another embodiment is shown. DETAILED DESCRIPTION
[0024] refer to Figures 1 to 3The following describes a battery and a pressure balancing unit according to an embodiment of the present application. The battery includes a housing 1, which defines a cavity 10 and a port 11 therein. A plurality of battery components 3 are arranged in the cavity 10, and a pressure balancing unit 2 is mounted to the port 11 of the housing 1 of the battery. The pressure balancing unit includes a body, which defines a mounting portion 21 and a channel 23. The mounting portion 21 is configured to be connected to the battery 1. For example, in some embodiments, the mounting portion 21 may have an external thread to be threadedly connected to the internal thread of the port 11 of the battery 1. The channel 23 connects the interior and exterior of the battery 1. The pressure balancing unit 2 also includes a barrier 41 disposed in the channel 23. The barrier 41 includes a first region 422 and a second region 421. One of the first region 422 and the second region 421 is a breathable and waterproof membrane, and the other of the first region 422 and the second region 421 is a weakened region. The breathable, waterproof membrane in the barrier 41 allows ventilation between the interior of the housing 1 and the exterior while preventing moisture from entering the interior. This maintains the internal pressure of the housing 1 during, for example, thermal cycling, while simultaneously preventing moisture from entering the interior of the housing 1. Therefore, the barrier 41 can be positioned across the channel 23. However, if one or more of the battery components 3 (battery component 31 in the figure) fails and rapidly releases gas, the internal pressure of the battery 1 increases rapidly. In this case, the weakened region of the barrier 41 may be destroyed before the breathable, waterproof membrane. By appropriately selecting the material, thickness, and / or connection strength of the weakened region to the breathable, waterproof membrane and the battery body, the internal pressure at which the weakened region will fail can be easily controlled, thereby improving the stability and safety of the battery system. Compared to requiring the barrier 41, which is constructed as a breathable, waterproof membrane, to rupture entirely under high pressure, the inclusion of a weakened region provides greater flexibility and controllability. In addition, compared with the solution of using a needle or other mechanism to puncture the barrier 41, the use of the weakened area does not require the provision of other mechanisms in the channel 23, so that the flow resistance of the channel 23 is smaller when the pressure inside the shell needs to be released.
[0025] like Figure 2 As shown, in some embodiments, the first region 422 of the barrier layer 41 may be annular. In some embodiments, the second region 421 of the barrier layer 41 may be circular, with the first region 422 surrounding and concentrically arranged with the second region 421. In alternative embodiments, the first region 422 and the second region 421 may have any other suitable shapes. Alternatively, the first region 422 surrounds the second region 421, and the first region 422 may be configured as a weakened region, or the second region 421 may be configured as a weakened region.
[0026] In some embodiments, the first region 422 can be configured as a weakened region and connected to the second region 421 by welding, molding, or bonding. In some embodiments, the first region 422 can be connected to the channel 23 of the body of the pressure balance unit 2 by welding, molding, or bonding. For example, the first region 422 can be made of a thermoplastic material as the weakened region and connected to the body of the pressure balance unit 2 and / or the second region 421 during the molding process. Alternatively, the weakened region can be bonded to the body of the pressure balance unit 2 and / or the second region 421 by adhesive. Alternatively, the weakened region can be connected to the body of the pressure balance unit 2 and / or the second region 421 by welding. In some embodiments, the weakened region can be connected to the body and / or the second region 421 by other suitable means. In some embodiments, the second region 421 can be configured as a weakened region and connected to the first region 422 by welding, molding, or bonding. Furthermore, the first region 422 can be connected to the channel 23 of the body by welding, molding, or bonding.
[0027] The weakened area is made of a material different from the breathable waterproof membrane. For example, in some embodiments, the weakened area may be made of metal foil, a thin plastic layer, or a thin rubber layer. Alternatively, the weakened area may be made of other suitable materials. In some embodiments, the weakened area itself also has some mechanical structure, such as a thinned portion or a weakened line.
[0028] In some embodiments, the channel 23 has a stepped portion 24 inside, and the first region 422 of the partition 41 is attached to the stepped portion 24, specifically, the plane of the stepped portion 24 facing the interior of the housing. Figure 4 As shown, the mounting portion 21 is configured with external threads 211 and / or snaps 212 to prevent unauthorized removal of the pressure balance unit 2 after installation. Optionally, thread sealant may be applied to the external threads 211 to further prevent unauthorized removal. In some embodiments, the body further includes a flange portion 22 that engages with the end of the port 11 of the housing. The flange portion 22 may be circular, square, or hexagonal, and a sealing ring may be provided between the flange portion 22 and the port 11 of the housing.
[0029] According to another aspect, a battery is provided, comprising the pressure balancing unit according to various embodiments.
[0030] The specific embodiments described above are intended only to more clearly illustrate the principles of the present invention, wherein the various components are clearly shown or described to make the principles of the present invention easier to understand. Those skilled in the art may readily make various modifications or variations to the present invention without departing from the scope of the present invention. It should be understood that such modifications or variations are intended to be within the scope of the present invention.
Claims
1. A pressure balancing unit for a battery, comprising: a body defining a mounting portion (21) and a passage (23), wherein the mounting portion (21) is configured to be connected to the battery and the passage (23) communicates between the interior and exterior of the battery; The invention is characterized in that the pressure balancing unit (2) further comprises a spacer (41) arranged in the channel (23), the spacer (41) having a first area (422) and a second area (421), wherein one of the first area (422) and the second area (421) is a breathable waterproof membrane, and the other of the first area (422) and the second area (421) is a weakened area, so that when the internal pressure of the battery increases rapidly, the weakened area is destroyed before the breathable waterproof membrane.
2. The pressure balancing unit according to claim 1, characterized in that The first region (422) surrounds the second region (421).
3. The pressure balancing unit according to claim 2, characterized in that The first region (422) is annular, the second region (421) is circular, and the first region (422) and the second region (421) are concentrically arranged.
4. The pressure balancing unit according to claim 1, characterized in that The spacer (41) spans the channel (23).
5. The pressure balancing unit according to claim 2 or 3, characterized in that: The first region (422) is the weakened region, the second region (421) is connected to the first region (422) by welding, molding or bonding, and the first region (422) is connected to the channel (23) of the body by welding, molding or bonding.
6. The pressure balancing unit according to claim 2 or 3, characterized in that: The second region (421) is the weakened region, and the second region (421) is connected to the first region (422) by welding, molding or bonding.
7. The pressure balancing unit according to any one of claims 1 to 4, characterized in that: The channel (23) has a stepped portion (24) inside, and the first region (422) is attached to the stepped portion (24).
8. The pressure balancing unit according to claim 5, characterized in that The channel (23) has a stepped portion (24) inside, and the first region (422) is attached to the stepped portion (24).
9. The pressure balancing unit according to claim 6, characterized in that: The channel (23) has a stepped portion (24) inside, and the first region (422) is attached to the stepped portion (24).
10. The pressure balancing unit according to any one of claims 1 to 4, characterized in that: The weakened area is a metal foil, a plastic thin layer or a rubber thin layer.
11. The pressure balancing unit according to claim 5, characterized in that The weakened area is a metal foil, a plastic thin layer or a rubber thin layer.
12. The pressure balancing unit according to claim 6, characterized in that The weakened area is a metal foil, a plastic thin layer or a rubber thin layer.
13. The pressure balancing unit according to any one of claims 1 to 4, characterized in that: The mounting portion (21) is configured to have an external thread (211) and / or a snap fastener (212).
14. The pressure balancing unit according to claim 5, characterized in that The mounting portion (21) is configured to have an external thread (211) and / or a snap fastener (212).
15. The pressure balancing unit according to claim 6, characterized in that The mounting portion (21) is configured to have an external thread (211) and / or a snap fastener (212).
16. A battery, characterized in that: The battery comprises: A housing (1), the housing (1) defining a cavity (10) and a port (11); a battery component (3) arranged in the cavity (10); and A pressure balancing unit according to any one of claims 1 to 15 mounted to a port (11) of the housing (1).