A battery electrolyte drainage structure

Abstract

The present invention discloses a battery electrolyte drainage structure, which is sandwiched between two adjacent single cells. The battery electrolyte drainage structure comprises a drainage layer and a liquid absorbing strip. The drainage layer comprises a first arc surface and a second arc surface. The first arc surface and the second arc surface are both in plurality. The axes of the first arc surface and the second arc surface are vertically arranged, and the adjacent sides of two adjacent first arc surface are respectively and smoothly connected to the two sides of the same second arc surface. The convex arc surface of the first arc surface abuts against the outer wall of one of the single cells, and the convex arc surface of the second arc surface abuts against the outer wall of another single cell. When the side wall of the single cell is damaged, the leaked electrolyte can flow downward from the concave arc surface of the first arc surface or the concave arc surface of the second arc surface to the liquid absorbing strip and be absorbed by the liquid absorbing strip, thereby avoiding the accumulation of electrolyte above the shell of the single cell to cause serious corrosion.

Description

Technical Field

[0001] The invention relates to the technical field of batteries, and in particular to a battery electrolyte drainage structure. Background Art

[0002] At present, in order to ensure the safe operation of the battery, a battery safety valve is usually provided on each single cell in the battery module. The battery safety valve is a common safety component of the battery module. When the internal pressure of the single cell is too high and exceeds the threshold set by the battery safety valve, the battery safety valve opens and the electrolyte will splash out everywhere.

[0003] If the electrolyte splashes onto the battery casing to form liquid accumulation, it will corrode the battery casing and cause perforation and leakage; the electrolyte may also form electrolysis between the battery pole and the battery casing, the battery conductive bar and the battery casing, or between two combined battery metal shells with a voltage difference, causing the metal film to short-circuit or arc, posing a safety hazard. Therefore, it is urgent to provide an electrolyte drainage structure that occupies a small space and can achieve drainage in a compact battery module. Summary of the invention

[0004] The purpose of the present invention is to overcome the above technical deficiencies and provide a battery electrolyte drainage structure, which realizes the drainage of leaked electrolyte between adjacent single cells in a battery module and occupies less space.

[0005] In order to achieve the above technical objectives, the technical solution of the present invention provides a battery electrolyte drainage structure, which is sandwiched between two adjacent single cells. The battery electrolyte drainage structure includes a drainage layer and a liquid absorbent strip. The drainage layer includes a first arc surface portion and a second arc surface portion. The first arc surface portion and the second arc surface portion are both multiple. The axes of the first arc surface portion and the second arc surface portion are both vertically arranged, and the adjacent sides of two adjacent first arc surface portions are respectively and smoothly connected to the two sides of the same second arc surface portion. The convex arc surface of the first arc surface portion abuts against the outer wall of one of the single cells, and the convex arc surface of the second arc surface portion abuts against the outer wall of another of the single cells. The liquid absorbent strip is arranged at the lower end of the drainage layer.

[0006] Compared with the prior art, the beneficial effects of the present invention include: the battery electrolyte drainage structure is sandwiched between two adjacent single cells, and when the side wall of the single cell is damaged, the leaked electrolyte can flow downward from the concave arc surface of the first arc surface portion or the concave arc surface of the second arc surface portion to the liquid absorbing strip and be absorbed by the liquid absorbing strip, and the electrolyte sprayed from the battery safety valve can also flow downward from the concave arc surface of the first arc surface portion or the concave arc surface of the second arc surface portion under the action of gravity to the liquid absorbing strip and be absorbed by the liquid absorbing strip, thereby avoiding the accumulation of electrolyte above the single cell shell to cause serious corrosion, and the above drainage structure occupies a small space and has a compact structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a schematic diagram of the installation position structure of an embodiment of the battery electrolyte drainage structure provided by the present invention;

[0008] Figure 2 yes Figure 1 A schematic diagram of the top view structure of FIG.

[0009] Figure 3 It is a schematic diagram of the explosion structure of the battery electrolyte drainage structure provided by the present invention. DETAILED DESCRIPTION

[0010] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0011] See also Figure 1 , Figure 2 , Figure 3 This embodiment provides a battery electrolyte drainage structure, which is sandwiched between two adjacent single cells 1. The upper end surface of the single cell 1 is provided with a positive electrode column 1b, a battery safety valve 1a, and a negative electrode column 1c in sequence along its length direction.

[0012] The battery electrolyte drainage structure includes a drainage layer 2 and a liquid absorbent strip 3. The drainage layer 2 includes a first arc portion 21 and a second arc portion 22. The first arc portion 21 and the second arc portion 22 are both multiple. The axes of the first arc portion 21 and the second arc portion 22 are vertically arranged, and the adjacent sides of two adjacent first arc portions 21 are smoothly connected to the two sides of the same second arc portion 22. The convex arc surface of the first arc portion 21 abuts against the outer wall of one of the single cells 1, and the convex arc surface of the second arc portion 22 abuts against the outer wall of another single cell 1. It can be understood that the horizontal cross-section of the drainage layer 2 is wavy.

[0013] The liquid absorbent strip 3 is disposed at the lower end of the drainage layer 2. In this embodiment, the liquid absorbent strip 3 may be made of a sponge or wool felt containing a flame retardant.

[0014] When the side wall of the single battery 1 is damaged, the leaked electrolyte can flow downward from the concave arc surface of the first arc surface 21 or the concave arc surface of the second arc surface 22 to the liquid absorbent strip 3 and be absorbed by the liquid absorbent strip 3, and the electrolyte sprayed from the battery safety valve 1a can also flow downward from the concave arc surface of the first arc surface 21 or the concave arc surface of the second arc surface 22 to the liquid absorbent strip 3 under the action of gravity and be absorbed by the liquid absorbent strip 3, thereby avoiding the accumulation of electrolyte above the shell of the single battery 1 to cause serious corrosion, and the above-mentioned drainage structure occupies less space and has a compact structure.

[0015] This embodiment also provides an implementation method, wherein the battery electrolyte drainage structure also includes a first heat-conducting layer 4 and a second heat-conducting layer 5, wherein one side of the first heat-conducting layer 4 abuts against the convex arc surface of the first arc surface portion 21, and the other side of the first heat-conducting layer 4 abuts against the outer wall of one of the single cells; one side of the second heat-conducting layer 4 abuts against the convex arc surface of the second arc surface portion 22, and the other side of the second heat-conducting layer 22 abuts against the outer wall of another of the single cells 1.

[0016] The first heat conducting layer 4 and / or the second heat conducting layer 5 is a copper plate with a thickness of 0.3 mm to 0.8 mm.

[0017] Alternatively, the first heat-conducting layer 4 and / or the second heat-conducting layer 5 is an aluminum plate with a thickness of 0.5 mm to 1.0 mm, that is, the first heat-conducting layer 4 and the second heat-conducting layer 5 can be made of copper plates or aluminum plates. Since multiple single batteries 1 are packaged in a sealed structure, at least one side edge of the first heat-conducting layer 4 and the second heat-conducting layer 5 needs to extend to the outside of the sealed structure, so as to facilitate guiding the inside of the packaging structure out of the packaging structure.

[0018] The drainage layer 2 is made of elastic material, specifically aerogel, silicone or polymer material Denairon. In this case, the drainage layer 2 can also play a heat insulating role, thereby reducing the heat conduction rate between adjacent single cells 1, and the elastic drainage layer 2 can compensate for the increased volume of the single cell 1 after expansion, avoiding adjacent single cells 1 from being squeezed and broken. At the same time, the drainage layer 2 with a wavy structure can avoid the space between adjacent single cells 1 being completely blocked after the single cell 1 expands, thereby ensuring that the expanded single cell 1 can also have a good conduction gap.

[0019] This embodiment also provides an implementation method, the battery electrolyte drainage structure also includes a first thermal insulation layer 6, the first thermal insulation layer 6 is arranged between the opposite surfaces of the first heat-conducting layer 4 and the drainage layer 2, the battery electrolyte drainage structure also includes a second thermal insulation layer 7, the second thermal insulation layer 7 is arranged between the opposite surfaces of the second heat-conducting layer 4 and the drainage layer 2, specifically, the first thermal insulation layer 6 and the first heat-conducting layer 4 are tightly bonded with a high-temperature resistant and corrosion-resistant adhesive, and the second thermal insulation layer 7 and the second heat-conducting layer 5 are also tightly bonded with a high-temperature resistant and corrosion-resistant adhesive. The above structure separates the drainage layer 2 from the first heat-conducting layer 4 and the second heat-conducting layer 5, further reducing the heat conduction rate between adjacent single batteries 1.

[0020] Working principle: The battery electrolyte drainage structure is sandwiched between two adjacent single cells. When the side wall of the single cell 1 is damaged, the leaked electrolyte can flow downward from the concave arc surface of the first arc surface 21 or the concave arc surface of the second arc surface 22 to the liquid absorbing strip 3 and be absorbed by the liquid absorbing strip 3. The electrolyte sprayed from the battery safety valve 1a can also flow downward from the concave arc surface of the first arc surface 21 or the concave arc surface of the second arc surface 22 to the liquid absorbing strip 3 under the action of gravity and be absorbed by the liquid absorbing strip 3, thereby avoiding the accumulation of electrolyte above the shell of the single cell 1 and causing serious corrosion. In addition, the above-mentioned drainage structure occupies a small space and has a compact structure. The drainage layer 2 with a wavy structure can prevent the space between adjacent single cells 1 from being completely blocked after the single cell 1 expands, thereby ensuring that the expanded single cell 1 can also have a good diversion gap.

[0021] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A battery electrolyte drainage structure, which is sandwiched between two adjacent single batteries, It is characterized in that The battery electrolyte drainage structure comprises a drainage layer and a liquid absorbing strip, wherein the drainage layer comprises a first arc surface and a second arc surface, wherein the first arc surface and the second arc surface are both in a plurality, wherein the axes of the first arc surface and the second arc surface are arranged vertically, and the adjacent sides of two adjacent first arc surface are respectively smoothly connected to the two sides of the same second arc surface, wherein the convex arc surface of the first arc surface abuts against the outer wall of one of the single cells, and the convex arc surface of the second arc surface abuts against the outer wall of another single cell; wherein the liquid absorbing strip is arranged at the lower end of the drainage layer; The battery electrolyte drainage structure further includes a first heat-conducting layer and a second heat-conducting layer, wherein one side of the first heat-conducting layer abuts against the convex arc surface of the first arc surface portion, and the other side of the first heat-conducting layer abuts against the outer wall of one of the single cells; one side of the second heat-conducting layer abuts against the convex arc surface of the second arc surface portion, and the other side of the second heat-conducting layer abuts against the outer wall of another of the single cells; The drainage layer is made of elastic material.

2. The battery electrolyte drainage structure according to claim 1, It is characterized in that The first heat-conducting layer and / or the second heat-conducting layer is a copper plate with a thickness of 0.3 mm to 0.8 mm.

3. The battery electrolyte drainage structure according to claim 1, It is characterized in that The first heat-conducting layer and / or the second heat-conducting layer is an aluminum plate with a thickness of 0.5 mm to 1.0 mm.

4. The battery electrolyte drainage structure according to claim 1, It is characterized in that The battery electrolyte drainage structure further includes a first heat insulation layer, which is arranged between the first heat conductive layer and the opposite surface of the drainage layer.

5. The battery electrolyte drainage structure according to claim 1, It is characterized in that The battery electrolyte drainage structure further includes a second heat insulation layer, and the second heat insulation layer is arranged between the second heat conductive layer and the opposite surface of the drainage layer.

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