CN220209100U - Bottom support plate and battery monomer with same - Google Patents

Abstract

The utility model provides a bottom plate and a battery unit with the same, wherein the bottom plate is arranged in a shell of the battery unit, communication holes penetrating through the bottom plate in the up-down direction are formed in the bottom plate, the number of the communication holes is multiple and are distributed at intervals, and the communication holes are suitable for conveying electrolyte on the lower side of the bottom plate to the upper side of the bottom plate under the action of capillary phenomenon. According to the bottom support plate, the communicating holes are formed in the bottom support plate, and the electrolyte fully infiltrates the pole piece assembly through the communicating holes, so that the cycle performance of the battery monomer can be improved, the service life of the battery monomer can be prolonged, and the use cost is reduced.

Description

Bottom support plate and battery monomer with same

Technical Field

The utility model relates to the technical field of battery monomer manufacturing, in particular to a bottom plate and a battery monomer with the bottom plate.

Background

In order to ensure the circulation efficiency of the charge and discharge of the battery monomer, the battery monomer in the prior art can be filled with electrolyte, under the action of gravity, a part of electrolyte is adsorbed on the pole piece assembly, the rest part of electrolyte remains at the bottom of the shell, and when the pole piece assembly needs to be infiltrated by the electrolyte again, the electrolyte remaining at the bottom of the shell cannot fully infiltrate the pole piece assembly, so that the circulation efficiency of the battery monomer is reduced.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. The utility model therefore proposes a bottom plate which can improve the cycle performance of the battery cells.

The utility model also provides a battery cell with the bottom plate.

According to the bottom plate provided by the embodiment of the utility model, the bottom plate is arranged in the shell of the battery unit, the bottom plate is provided with the communication holes penetrating through the bottom plate along the up-down direction, the communication holes are arranged at intervals, and the communication holes are suitable for conveying electrolyte on the lower side of the bottom plate to the upper side of the bottom plate under the action of capillary phenomenon.

According to the bottom support plate, the communicating holes are formed in the bottom support plate, and the electrolyte fully infiltrates the pole piece assembly through the communicating holes, so that the cycle performance of the battery monomer can be improved, the service life of the battery monomer can be prolonged, and the use cost is reduced.

According to some embodiments of the utility model, the bottom plate includes a support beam and a main plate, the main plate is horizontally disposed, the support beam is connected to a lower side of the main plate, and the communication hole penetrates the support beam and the main plate in an up-down direction.

According to some alternative embodiments of the utility model, the main plate is formed with a lightening hole penetrating the main plate in an up-down direction.

According to some embodiments of the utility model, the communication hole is a circular hole and has a diameter of 0.01mm-5mm; or, the communication hole is a polygonal hole and the shortest side of the polygonal hole has a length of 0.01mm-5mm.

According to some embodiments of the utility model, the upper surface of the bottom plate is formed with a reservoir for collecting electrolyte.

According to some alternative embodiments of the utility model, the reservoir is formed by a downward depression in the upper surface of the bottom plate; or the upper side surface of the bottom supporting plate is provided with a plurality of convex ribs, and the convex ribs are matched to define the liquid storage tank.

According to some optional embodiments of the present utility model, the plurality of ribs includes a first rib and a second rib, the first rib is a plurality of, the first ribs are arranged in parallel and at intervals, the second rib is a plurality, the second ribs are arranged in parallel and at intervals, wherein the extending directions of the first rib and the second rib are different, and the first ribs and the second ribs intersect and cooperate to define a plurality of liquid storage tanks.

According to some embodiments of the utility model, the spacing between the bottom wall of the reservoir and the underside surface of the bottom plate is 0.001mm-5mm.

According to some embodiments of the utility model, the bottom plate is an electrolyte resistant plastic piece.

The battery cell according to an embodiment of the second aspect of the utility model comprises a bottom plate according to the first aspect of the utility model.

According to the battery monomer, through the arrangement of the bottom support plate of the embodiment of the first aspect, the communicating holes are formed in the bottom support plate, so that the pole piece assembly can be fully soaked, the cycle performance of the battery monomer is improved, the service life of the battery monomer is prolonged, and the use cost is reduced.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

FIG. 1 is a schematic view of a first angle of a base plate according to a first embodiment of the utility model;

FIG. 2 is a schematic view of a second angle of the bottom pallet shown in FIG. 1;

FIG. 3 is a schematic view of a third angle of the bottom pallet shown in FIG. 1;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;

FIG. 5 is a schematic view of a fourth angle of the bottom pallet shown in FIG. 1;

FIG. 6 is a schematic view of a fifth angle of the bottom pallet shown in FIG. 1;

FIG. 7 is a schematic view of a first angle of a bottom pallet of a second embodiment of the utility model;

FIG. 8 is a schematic view of a second angle of the bottom pallet shown in FIG. 7;

FIG. 9 is a schematic view of a third angle of the bottom pallet shown in FIG. 7;

FIG. 10 is a cross-sectional view taken along line B-B of FIG. 9;

FIG. 11 is a schematic view of a fourth angle of the bottom pallet shown in FIG. 7;

fig. 12 is a schematic view of a fifth angle of the bottom pallet shown in fig. 7.

Reference numerals:

100. a bottom support plate;

10. a support beam;

20. a main board; 21. a lightening hole; 22. a liquid storage tank; 23. convex ribs; 231. the first convex rib; 232. the second convex rib;

30. the communication hole.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

First, a battery cell according to an embodiment of the second aspect of the present utility model will be briefly described with reference to fig. 1 to 12, the battery cell including: the pole piece assembly comprises a shell, a pole piece assembly and a bottom supporting plate of the embodiment of the first aspect of the utility model, wherein the pole piece assembly and the bottom supporting plate are arranged inside the shell, and the bottom supporting plate is arranged on the lower side of the pole piece assembly.

A floor board 100 according to an embodiment of the present utility model is described below with reference to fig. 1 to 12.

Referring to fig. 1, 2 and 3, according to the bottom plate 100 of the first aspect of the embodiment of the present utility model, provided in a case of a battery cell, the bottom plate 100 is formed with communication holes 30 penetrating the bottom plate 100 in an up-down direction (up-down direction as shown in fig. 1), the number of the communication holes 30 being plural and arranged at intervals, that is, the number of the communication holes 30 may be two, three or four or more, and the communication holes 30 are adapted to transfer an electrolyte located at a lower side of the bottom plate 100 to an upper side of the bottom plate 100 by capillary phenomenon. The capillary phenomenon refers to the phenomenon that the infiltration liquid rises in the tubule and the phenomenon that the non-infiltration liquid falls in the tubule.

For example, as shown in fig. 2, the transfer sheet has a rectangular shape, the communication holes 30 are arranged in two rows in the front-rear direction, a plurality of communication holes 30 are arranged in each row, and each row of communication holes 30 is arranged at intervals in the left-right direction.

In the prior art, in order to ensure the normal circulation of battery monomer charge and discharge, electrolyte is generally injected into a battery monomer shell, the electrolyte is generally adsorbed on a pole piece assembly, other electrolyte is accumulated at the bottom of the inside of the shell, the volume of the pole piece assembly is small and the compaction density is large when the battery monomer discharges, the porosity of the pole piece assembly is reduced, the electrolyte is separated out from the pole piece assembly, the volume of the pole piece assembly is large and the compaction density is small when the battery monomer charges, the porosity of the pole piece assembly is increased, the pole piece assembly needs electrolyte to be infiltrated again to ensure the charging capacity, however, most of electrolyte is stored at the bottom of the inside of the shell, difficulty is brought to the re-infiltration of the pole piece assembly, and thus the battery efficiency is reduced.

According to the bottom support plate 100, the communication holes 30 are formed in the bottom support plate 100, the communication holes 30 can serve as thin tubes, and electrolyte stored at the bottom of the shell can be lifted to the position above the bottom support plate 100 through capillary action of the communication holes 30, so that the pole piece assembly can be fully soaked, the cycle performance of a battery monomer is improved, meanwhile, the situation that the service life of the battery monomer is reduced due to insufficient soaking of the pole piece assembly can be prevented, the service time of the battery monomer can be prolonged, and the use cost is reduced.

According to the bottom support plate 100 provided by the embodiment of the utility model, the communication holes 30 are arranged on the bottom support plate 100, and the electrolyte fully infiltrates the pole piece assembly through the communication holes 30, so that the cycle performance of the battery cell can be improved, the service life of the battery cell can be prolonged, and the use cost is reduced.

According to some embodiments of the present utility model, referring to fig. 1 and 2, the bottom plate 100 includes a support beam 10 and a main plate 20, the main plate 20 is horizontally disposed, the support beam 10 is connected to the lower side of the main plate 20, and the communication holes 30 penetrate the support beam 10 and the main plate 20 in the up-down direction (up-down direction as shown in fig. 1). Thus, the support beam 10 can strengthen the strength of the bottom plate 100, prevent the bottom plate 100 from being damaged, and the communication holes 30 are provided in the vertical direction, so that the electrolyte can rise from the bottom of the housing to the upper portion of the bottom plate 100 to infiltrate the pole piece assembly, thereby improving the cycle performance of the battery cell.

For example, as shown in fig. 1, the support beams 10 are arranged two and spaced apart in the front-rear direction, one of the support beams 10 is arranged at the front end of the lower side of the main plate 20 with the front side surface of the support beam 10 flush with the front side surface of the main plate 20, the other support beam 10 is arranged at the rear end of the lower side of the main plate 20 with the rear side surface of the support beam 10 flush with the rear side surface of the main plate 20, and the support beam 10 extends in the left-right direction with the length in the left-right direction equal to that of the main plate 20.

According to some alternative embodiments of the present utility model, referring to fig. 1, a weight reducing hole 21 penetrating the main plate 20 in the up-down direction (up-down direction as shown in fig. 1) is formed on the main plate 20. Thus, the weight of the main board 20 can be reduced, and the processing of the bottom plate 100 can be facilitated.

For example, as shown in fig. 1, the weight-reducing holes 21 are four rectangular holes chamfered in a circular arc shape, two weight-reducing holes 21 are arranged, and two weight-reducing holes 21 are arranged at intervals in the left-right direction, so that the weight-reducing effect can be ensured.

According to some embodiments of the present utility model, referring to fig. 3, the communication hole 30 is a circular hole and has a diameter of 0.01mm to 5mm. In this way, too small a diameter of the communication hole 30 can be prevented, which makes it impossible for the electrolyte to rise through the communication hole 30, and too large a diameter of the communication hole 30 can be avoided, which makes it impossible for the communication hole 30 to function as a tubule, which makes it impossible for the electrolyte to rise.

For example, as shown in fig. 3, the communication hole 30 is a circular hole and has a diameter of: 0.01mm, 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm or 5mm.

Further, as shown in fig. 3, the communication hole 30 is a polygonal hole and the shortest side of the polygonal hole has a length of 0.01mm to 5mm. Therefore, the communication hole 30 can be machined into a proper shape according to actual needs, design freedom is improved, meanwhile, the side length of the communication hole 30 is limited, electrolyte can be prevented from rising through the communication hole 30 due to too small of the communication hole 30, and the communication hole 30 can be prevented from being too large to serve as a thin tube, so that the electrolyte can not rise.

For example, as shown in fig. 3, the communication hole 30 is a polygonal hole and the length of the shortest side of the polygonal hole is: 0.01mm, 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm or 5mm.

According to some embodiments of the present utility model, referring to fig. 1 and 3, an upper side surface of the bottom plate 100 is formed with a liquid reservoir 22 for collecting electrolyte. In this way, the contact part of the pole piece assembly and the upper surface of the bottom supporting plate 100 can be directly infiltrated by the electrolyte in the liquid storage tank 22, so that the infiltration effect of the electrolyte on the pole piece assembly can be ensured.

According to some alternative embodiments of the utility model, referring to fig. 7, the sump 22 is formed by a downward depression of the upper surface of the bottom plate 100. Thus, the reservoir 22 is simple in structure, convenient to process, and convenient for mass production.

For example, as shown in fig. 7, a plurality of liquid storage tanks 22 are arranged, the liquid storage tanks 22 are arranged at intervals in the left-right direction, and the liquid storage tanks 22 are rectangular with the length in the front-back direction being longer than the length in the left-right direction, so that the liquid storage tanks 22 are structured regularly, and the liquid storage tanks 22 can be processed conveniently.

Further, as shown in fig. 3, the upper surface of the bottom plate 100 is provided with a plurality of ribs 23, that is, the number of the ribs 23 may be two, three or four or more, and the plurality of ribs 23 cooperate to define the liquid storage tank 22. Therefore, the liquid storage groove 22 does not need to be additionally and independently processed, so that the processing steps of the bottom supporting plate 100 can be reduced, the production efficiency is convenient to improve, and meanwhile, the plurality of convex ribs 23 separate the pole piece assembly from the liquid storage groove 22 by a certain distance, so that the circulation of electrolyte between the pole piece assembly and the liquid storage groove 22 can be convenient.

According to some alternative embodiments of the present utility model, referring to fig. 1 and 3, the plurality of ribs 23 includes a first rib 231 and a second rib 232, the first rib 231 may be plural, that is, the number of the first ribs 231 may be two, three or four or more, the plurality of first ribs 231 may be arranged at intervals in parallel, the second rib 232 may be plural, that is, the number of the second ribs 232 may be two, three or four or more, the plurality of second ribs 232 may be arranged at intervals in parallel, wherein the extending directions of the first ribs 231 and the second ribs 232 are different, and the plurality of first ribs 231 and the plurality of second ribs 232 intersect and cooperate to define the plurality of reservoirs 22.

Thus, the first ribs 231 and the second ribs 232 cooperate to form a plurality of liquid storage tanks 22, the liquid storage tanks 22 do not need to be independently reprocessed, the processing steps can be reduced, and meanwhile, the liquid storage tanks 22 are uniformly distributed at intervals along the directions of the first ribs 231 and the second ribs 232, so that the liquid storage tanks 22 are uniformly distributed on the bottom guard plate, and the electrolyte in the liquid storage tanks 22 can be fully infiltrated into the polar plate assembly.

For example, as shown in fig. 3, the first beads 231 are arranged to extend in the front-right direction, each of the first beads 231 is parallel to each other, the second beads 232 are arranged to extend in the front-left direction, each of the second beads 232 is parallel to each other, and the plurality of first beads 231 and the plurality of second beads 232 cooperate to form the plurality of quadrangular reservoirs 22.

According to some embodiments of the utility model, referring to fig. 1, the spacing between the bottom wall of the reservoir 22 and the underside surface of the bottom plate 100 is 0.001mm-5mm. Thus, the thickness between the bottom wall of the liquid storage tank 22 and the lower surface of the bottom plate 100 can be ensured, the damage of the liquid storage tank 22 is prevented, so that electrolyte cannot be stored normally, meanwhile, the maximum thickness between the bottom wall of the liquid storage tank 22 and the lower surface of the bottom plate 100 is limited, when the battery monomer is in thermal runaway, the liquid storage tank 22 can be melted rapidly to form an exhaust channel, the gas is conveniently discharged, the explosion of the battery monomer is prevented, and the use safety of the battery monomer can be improved.

For example, the spacing between the bottom wall of the reservoir 22 and the underside surface of the bottom plate 100 may be: 0.01mm, 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm or 5mm.

According to some embodiments of the utility model, referring to fig. 1, the bottom pallet 100 is an electrolyte resistant plastic piece. Thus, the bottom plate 100 can be prevented from being corroded by the electrolyte, and the service life of the bottom plate 100 can be increased. Preferably, the bottom plate 100 may be PP (polypropylene) or PPs (polyphenylene sulfide), so that the corrosion resistance of the bottom plate 100 against the electrolyte can be ensured.

According to a second aspect of the present utility model, referring to fig. 2, a battery cell includes a housing, a pole piece assembly, and a bottom plate 100 of the first aspect of the present embodiment, the bottom plate 100 is disposed in the housing and is located at the bottom of the housing, and the pole piece assembly is supported on the bottom plate 100.

According to the battery monomer according to the embodiment of the utility model, by arranging the bottom support plate 100 of the embodiment of the first aspect, the communicating hole 30 is arranged on the bottom support plate 100, and the electrolyte fully infiltrates the pole piece assembly through the communicating hole 30, so that the cycle performance of the battery monomer can be improved, the service life of the battery monomer can be further improved, and the use cost is reduced.

The battery cells according to two embodiments of the present utility model are described below with reference to fig. 1 to 11.

In a first embodiment of the present utility model,

as shown in fig. 1, a battery cell according to an embodiment of the present utility model includes a housing, a pole piece assembly, and a bottom plate 100. Wherein the pole piece assembly and the bottom support plate 100 are arranged in the shell, and the bottom support plate 100 is arranged between the pole piece assembly and the bottom of the shell.

The bottom pallet 100 includes: the two support beams 10, the mainboard 20 and a plurality of protruding muscle 23, wherein, the mainboard 20 level sets up, the downside at the mainboard 20 is connected to the support beam 10, one support beam 10 is established at the front end of mainboard 20, another support beam 10 is established at the rear end of mainboard 20, protruding muscle 23 includes a plurality of first protruding muscle 231 and a plurality of second protruding muscle 232, a plurality of first protruding muscle 231 extends along right front towards left rear direction and arranges, a plurality of first protruding muscle 231 is along left right direction interval arrangement and each other parallel, a plurality of second protruding muscle 232 extends along left front towards right rear direction and arranges along left right direction interval arrangement and each other parallel, a plurality of first protruding muscle 231 and a plurality of second protruding muscle 232 intersect and cooperate and define a plurality of liquid storage tanks 22.

The bottom plate 100 is further formed with a plurality of communication holes 30 and two lightening holes 21, the communication holes 30 penetrate the support beam 10 and the main plate 20 in the up-down direction, the plurality of communication holes 30 are arranged at intervals in the left-right direction, the lightening holes 21 penetrate the main plate 20 in the up-down direction, the lightening holes 21 are four rectangular holes with circular arc-shaped chamfers, and the two lightening holes 21 are arranged at intervals in the left-right direction.

When the battery cell is assembled, the bottom plate 100 is firstly arranged at the bottom of the inside of the shell, the upper surface of the bottom plate 100 faces upwards, then the pole piece assembly is arranged on the upper side of the bottom plate 100, and then the shell is sealed, and at the moment, the battery cell is assembled.

According to the battery monomer, through the arrangement of the bottom support plate 100 in the embodiment of the first aspect, the communication holes 30 are arranged on the bottom support plate 100, and the electrolyte fully infiltrates the pole piece assembly through the communication holes 30, so that the cycle performance of the battery monomer can be improved, the service life of the battery monomer can be prolonged, and the use cost is reduced.

In a second embodiment of the present utility model,

as shown in fig. 7, the present embodiment is substantially the same as the first embodiment in that the same reference numerals are used for the same components, and the difference is that: the liquid storage groove 22 in the first embodiment is defined by a plurality of ribs 23 intersecting each other, and the liquid storage groove 22 in the second embodiment is formed by downwardly recessing the upper surface of the bottom plate 100.

Compared to the bottom plate 100 of the first embodiment, the bottom plate 100 of the present embodiment can be manufactured according to the actual needs in the depth of the reservoir 22, and thus the applicability of the bottom plate 100 can be improved.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. The bottom support plate is arranged in a shell of the battery cell, and is characterized in that communication holes penetrating through the bottom support plate along the up-down direction are formed in the bottom support plate, the communication holes are distributed at intervals, and the communication holes are suitable for conveying electrolyte on the lower side of the bottom support plate to the upper side of the bottom support plate under the action of capillary phenomenon.

2. The bottom plate according to claim 1, wherein the bottom plate comprises a support beam and a main plate, the main plate is horizontally disposed, the support beam is connected to a lower side of the main plate, and the communication holes penetrate the support beam and the main plate in an up-down direction.

3. The floor panel according to claim 2, wherein the main plate is formed with a lightening hole penetrating the main plate in the up-down direction.

4. The bottom pallet according to claim 1, wherein the communication holes are circular holes and have a diameter of 0.01mm to 5mm; or, the communication hole is a polygonal hole and the shortest side of the polygonal hole has a length of 0.01mm-5mm.

5. The bottom plate according to any one of claims 1 to 4, wherein an upper side surface of the bottom plate is formed with a reservoir for collecting electrolyte.

6. The bottom pallet of claim 5, wherein the reservoir is formed by a downward depression in an upper surface of the bottom pallet; or (b)

The upper side surface of the bottom supporting plate is provided with a plurality of convex ribs, and the convex ribs are matched to define the liquid storage tank.

7. The bottom bracket of claim 6, wherein the plurality of ribs comprises a first rib and a second rib, the first rib is a plurality of ribs, the first ribs are arranged at intervals in parallel, the second rib is a plurality of ribs, the second ribs are arranged at intervals in parallel, the extending directions of the first rib and the second rib are different, and the first ribs and the second ribs intersect and cooperate to define a plurality of liquid reservoirs.

8. The bottom pallet of claim 5, wherein a spacing between a bottom wall of the reservoir and an underside surface of the bottom pallet is 0.001mm to 5mm.

9. The bottom pallet of claim 1, wherein the bottom pallet is an electrolyte resistant plastic piece.

10. A battery cell comprising a housing, a pole piece assembly and a bottom plate according to any one of claims 1-9, the bottom plate being disposed within the housing and at the bottom of the housing, the pole piece assembly being supported on the bottom plate.