Battery cell support and battery pack

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cell bracket and a battery pack. The battery cell bracket comprises a base material and a coating layer coated outside the base material, the base material comprises one of glass fibers or carbon fibers, and the coating layer comprises a resin piece. A first pressure relief hole is formed in the glass fiber or the carbon fiber, a second pressure relief hole is formed in the resin part, and the first pressure relief hole and the second pressure relief hole are mutually overlapped to form a pressure relief hole for supporting the cylindrical battery cell. The battery cell support can be integrally formed by the resin piece and the glass fiber or the resin piece and the carbon fiber, an operator designs the size of the glass fiber or the carbon fiber according to the size of the required battery cell support, and the resin piece and the glass fiber or the carbon fiber are integrally formed, so that the step of splicing a plurality of plastic supports is omitted, and the production efficiency is improved. The working efficiency is improved and the cost is saved. Compared with a plastic bracket in the prior art, the battery cell bracket disclosed by the utility model has higher mechanical strength.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a cell support and a battery pack. Background Art

[0002] With the continuous development of battery technology, cylindrical batteries, as a type of lithium battery, have been increasingly favored. A cylindrical battery usually includes a cell body and a cell support. The cell body is arranged on the cell support. The cell support is used to physically isolate multiple cell bodies to avoid short - circuit phenomena. At the same time, it is also beneficial to the heat dissipation of the cell body and improves the stability of the battery pack structure.

[0003] With the pursuit of high energy density of battery packs in the industry, the volume of battery packs is designed to be larger and larger, which requires a larger - sized cell support to support the cell body. In the prior art, it is usually necessary to splice multiple conventional PP plastic supports to meet the requirements of a large - sized cell support. This method not only increases the manufacturing cost and reduces work efficiency, but also the strength of the connection between adjacent two PP plastic supports is relatively low, and there is a risk of cracks or even fractures during use.

[0004] Therefore, it is urgent to design a cell support and a battery pack to solve the above - mentioned technical problems. Summary of the Utility Model

[0005] The first object of the utility model is to provide a cell support that can meet the requirements of a large - sized cell support, does not require splicing, has high strength, can improve work efficiency and save costs.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a cell support, including:

[0008] A base material and a coating layer coated outside the base material;

[0009] The base material includes glass fiber or carbon fiber; a first pressure - relief hole is arranged on the glass fiber or the carbon fiber;

[0010] The coating layer includes a resin part; a second pressure - relief hole is arranged on the resin part, and the first pressure - relief hole and the second pressure - relief hole overlap with each other to form a pressure - relief hole for supporting a cylindrical cell.

[0011] As an optional technical solution of the cell support, a plurality of pressure - relief holes are arranged, the plurality of pressure - relief holes are arranged in an array, and the pressure - relief holes penetrate through opposite sides of the cell support.

[0012] As an alternative technical solution of the battery cell bracket, there is a connecting portion between two adjacent pressure relief holes, and the glass fiber or the carbon fiber is disposed inside the connecting portion.

[0013] As an alternative technical solution of the battery cell bracket, a boss is protruded from the inner wall of the pressure relief hole, and the boss is configured to support the cylindrical battery cell; the glass fiber or the carbon fiber is disposed inside the boss.

[0014] As an alternative technical solution of the battery cell bracket, the glass fiber is formed by arranging a plurality of glass fiber strips, and the extending directions of the plurality of glass fiber strips are the same; or, the carbon fiber is formed by arranging a plurality of carbon fiber strips, and the extending directions of the plurality of carbon fiber strips are the same.

[0015] As an alternative technical solution of the battery cell bracket, two adjacent glass fiber strips or two adjacent carbon fiber strips are spaced apart, and the spacing is between 0 mm and 2 cm.

[0016] As an alternative technical solution of the battery cell bracket, two adjacent glass fiber strips or two adjacent carbon fiber strips are equally spaced.

[0017] As an alternative technical solution of the battery cell bracket, the pressure relief holes are arranged in multiple columns, and two adjacent columns of the pressure relief holes are arranged in a staggered manner.

[0018] As an alternative technical solution of the battery cell bracket, the pressure relief hole is circular or square.

[0019] The second object of the present invention is to provide a battery pack, which has the characteristics of high processing efficiency, high strength and low cost.

[0020] To achieve this purpose, the present invention adopts the following technical solutions:

[0021] The present invention provides a battery pack, which includes a cylindrical battery cell and the above-mentioned battery cell bracket, and the cylindrical battery cell is disposed on the battery cell bracket.

[0022] The beneficial effects of the present invention at least include:

[0023] The present utility model provides a battery cell bracket, which comprises a base material and a coating layer coated outside the base material. The base material comprises one of glass fiber or carbon fiber, and the coating layer comprises a resin part. Among them, a first pressure relief hole is provided on the glass fiber or carbon fiber, and a second pressure relief hole is provided on the resin part. The first pressure relief hole and the second pressure relief hole overlap with each other to form a pressure relief hole for supporting a cylindrical battery cell. That is to say, the battery cell bracket in the present utility model can be integrally formed by the resin part and the glass fiber, or integrally formed by the resin part and the carbon fiber. In this way, the operator only needs to design the size of the glass fiber or carbon fiber according to the required size of the battery cell bracket, and then integrally form the resin part with the glass fiber or carbon fiber, so that the size of the battery cell bracket can be flexibly designed. That is to say, the operator can design a larger-sized battery cell bracket to meet different requirements. Thus, the step of splicing by multiple plastic brackets in the prior art is omitted, and the work efficiency can be improved and the cost can be saved. At the same time, in the present utility model, the resin part and the glass fiber or carbon fiber are integrally formed, which can improve the strength of the battery cell bracket and extend the service life. That is to say, compared with the plastic bracket in the traditional technology, the battery cell bracket in the present utility model has higher mechanical strength.

[0024] The present utility model also provides a battery pack, which has the characteristics of high processing efficiency, high strength and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required to be used in the description of the embodiments of the present utility model. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present utility model and these drawings.

[0026] Figure 1 is an exploded view of the battery cell bracket provided by the embodiment of the present utility model Figure 1 ;

[0027] Figure 2 is Figure 1 a partial enlarged view of part A in

[0028] Figure 3 is a schematic view of the preparation method of the battery cell bracket provided by the embodiment of the present utility model Figure 1 ;

[0029] Figure 4 is an exploded view of the battery cell bracket provided by the embodiment of the present utility model Figure 2 ;

[0030] Figure 5 is Figure 4 a partial enlarged view of part B in

[0031] Figure 6 It is a schematic of the preparation method of the battery cell bracket provided by the embodiments of the present utility model. Figure 2 .

[0032] Reference numerals

[0033] 100, fiberglass; 110, first pressure relief hole; 200, carbon fiber; 300, resin part; 310, second pressure relief hole; 320, connecting part. Detailed implementation manners

[0034] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated herein can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0036] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0037] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0038] In the description of the present utility model, it should also be noted that, unless otherwise clearly specified and defined, the terms "arranged" and "connected" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0039] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0040] The embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0041] This embodiment provides a battery cell bracket, which can meet the requirements for large-size battery cell brackets, does not require splicing, has relatively high strength, can improve work efficiency and save costs.

[0042] Such as Figures 1-6As shown, the cell holder mainly includes a base material and a coating layer coated outside the base material. Among them, the base material includes one of glass fiber 100 or carbon fiber 200, and the coating layer includes a resin part 300. A first pressure relief hole 110 is provided on the glass fiber 100 or carbon fiber 200, and a second pressure relief hole 310 is provided on the resin part 300. The first pressure relief hole 110 and the second pressure relief hole 310 overlap with each other and form a pressure relief hole for supporting a cylindrical cell (not shown in the figure). That is to say, the cell holder in this embodiment can be integrally formed by the resin part 300 and the glass fiber 100, or integrally formed by the resin part 300 and the carbon fiber 200. In this way, the operator only needs to design the size of the glass fiber 100 or carbon fiber 200 according to the required size of the cell holder, and then integrally form the resin part 300 with the glass fiber 100 or carbon fiber 200, so that the size of the cell holder can be flexibly designed. That is to say, the operator can design a larger-sized cell holder to meet different needs. Thus, the step of splicing multiple plastic holders in the prior art is omitted, and the work efficiency can be improved and the cost can be saved. At the same time, in this embodiment, by integrally forming the resin part 300 with the glass fiber 100 or carbon fiber 200, the strength of the cell holder can be improved and the service life can be extended. That is to say, compared with the plastic holder in the traditional technology, the cell holder in this embodiment has higher mechanical strength.

[0043] Optionally, the resin part 300 in this embodiment can completely cover the periphery of the glass fiber 100 or carbon fiber 200, or can partially cover the glass fiber 100 or carbon fiber 200. That is to say, the resin part 300 covers a part of the glass fiber 100 or a part of the carbon fiber 200, and exposes another part of the glass fiber 100 or another part of the carbon fiber 200 outside the resin part 300. Exemplarily, the upper surface of another part of the glass fiber 100 or the upper surface of another part of the carbon fiber 200 can be exposed outside the resin part 300 to improve the flexibility of preparing the cell holder.

[0044] Optionally, the pressure relief holes in this embodiment are set to be multiple, and the multiple pressure relief holes are arranged in an array, and the pressure relief holes penetrate through the opposite sides of the cell holder. Each pressure relief hole supports a cylindrical cell. By arranging the multiple pressure relief holes in an array, the distance between adjacent two cylindrical cells is made equal, and thus the heat dissipation effect between the cylindrical cells can be improved, and the phenomenon of heat concentration can be avoided or reduced.

[0045] As Figure 2 and Figure 5 shown, in this embodiment, there is a connecting part 320 between adjacent two pressure relief holes, and the inside of the connecting part 320 has glass fiber 100 or carbon fiber 200. The setting of the connecting part 320 can connect adjacent two pressure relief holes, and thus improve the mechanical strength and integrity of the cell holder and extend the service life.

[0046] Furthermore, the inner wall of the pressure relief hole in this embodiment is convexly provided with a boss (not shown in the figure), and the boss is configured to support the cylindrical battery cell; the inside of the boss has glass fiber 100 or carbon fiber 200. The boss is integrally formed with the resin part 300. By providing the boss, the cylindrical battery cell can be supported to prevent the cylindrical battery cell from falling from the inside of the pressure relief hole. The projected area of the boss in each pressure relief hole is smaller than the projected area of the pressure relief hole, thereby ensuring that the pressure relief hole will not be completely blocked by the boss. Thus, when the cylindrical battery cell undergoes thermal runaway, it is beneficial for the high-temperature and high-pressure gas in the cylindrical battery cell to be discharged from the pressure relief hole, avoiding dangers such as explosion.

[0047] Optionally, the ratio of the length of the connecting part 320 to the diameter of the pressure relief hole in this embodiment is set to be between 0.8 and 1.5. Exemplarily, the ratio of the length of the connecting part 320 to the diameter of the pressure relief hole can be set to values such as 0.8, 1.0, 1.2, 1.5, etc.

[0048] Optionally, the pressure relief holes in this embodiment are circular or square, and preferably circular pressure relief holes, so that they can be adapted to the cylindrical battery cells and more cylindrical battery cells can be arranged on the limited battery cell support. Of course, the operator can also set the pressure relief holes to other shapes, which will not be elaborated here one by one.

[0049] Optionally, the resin part 300 and one of the glass fiber 100 or carbon fiber 200 in this embodiment are injection-molded, and the injection temperature can be set to 225°C to 250°C.

[0050] As Figure 1 shown, the pressure relief holes in this embodiment are arranged in multiple columns, and the adjacent two columns of pressure relief holes are arranged in a staggered manner, so that more pressure relief holes can be arranged on the battery cell support of a certain size, thereby improving the energy density of the battery pack and saving costs.

[0051] As Figure 3 and Figure 6 shown, this embodiment provides a preparation method for a battery cell support for preparing the above-mentioned battery cell support. The preparation method of the battery cell support includes:

[0052] Lay and place the glass fiber 100 or carbon fiber 200 flat on the workbench;

[0053] Specifically, the operator can use existing automated equipment to lay and place the glass fiber 100 or carbon fiber 200 flat on the workbench to ensure that there is a gap between the glass fiber 100 or carbon fiber 200 and the workbench.

[0054] Prepare the first pressure relief holes 110 on the glass fiber 100 or carbon fiber 200;

[0055] Specifically, as Figures 2-3As shown, the operator can squeeze part of the glass fiber 100 or part of the carbon fiber 200 through the concave-convex mold to form the first pressure relief hole 110. Optionally, the single hole squeezing pressure applied by the concave-convex mold to the glass fiber 100 and the carbon fiber 200 can be set to between 10N and 100N.

[0056] like Figures 5-6 As shown, optionally, the operator can also cut part of the glass fiber 100 or part of the carbon fiber 200 through a knife die to form the first pressure relief hole 110. Whether the first pressure relief hole 110 is processed by a concave-convex mold or a knife die, the first pressure relief hole 110 can be formed on the glass fiber 100 or the carbon fiber 200, so that in the later stage when the battery cell bracket becomes a part, there is no need to use additional machining equipment to process the first pressure relief hole 110, thereby improving work efficiency and saving costs.

[0057] It is understandable that the above-mentioned concave and convex molds and knife molds are conventional parts, and their structures and working principles are not described in detail here.

[0058] The glass fiber 100 in this embodiment is formed by arranging a plurality of glass fiber strips, and the extension directions of the plurality of glass fiber strips are the same; or, the carbon fiber 200 is formed by arranging a plurality of carbon fiber strips, and the extension directions of the plurality of carbon fiber strips are the same.

[0059] Furthermore, in the present embodiment, two adjacent glass fiber strips or two adjacent carbon fiber strips are spaced apart, and the spacing is set between 0mm and 2cm. For example, the spacing can be set to 0mm, 5mm, 1cm, 2cm, and so on. In other words, there can be a spacing between two adjacent glass fiber strips or two adjacent carbon fiber strips, or there can be zero spacing, which can improve the flexibility of the layout of the glass fiber strips or carbon fiber strips, and the operators can flexibly arrange the glass fiber strips and carbon fiber strips according to actual needs. When there is a spacing between two adjacent glass fiber strips or two adjacent carbon fiber strips, this can reduce the number of glass fiber strips or carbon fiber strips, thereby saving costs, and can also make the battery cell bracket lightweight; when there is zero spacing between two adjacent glass fiber strips or two adjacent carbon fiber strips, this can improve the mechanical strength of the battery cell bracket and extend its service life.

[0060] Furthermore, in the present embodiment, two adjacent glass fiber strips or two adjacent carbon fiber strips are arranged at equal intervals, which can improve the stress condition of the battery cell support, make the battery cell support evenly stressed, and avoid stress concentration.

[0061] Inject the resin onto the glass fiber 100 or carbon fiber 200; since there is a gap between the glass fiber 100 or carbon fiber 200 and the working table, this can ensure that the resin can flow under the glass fiber 100 or carbon fiber 200, so that the resin can completely wrap the glass fiber 100 or carbon fiber 200, improving the stability and reliability of the cell holder, and at the same time can also avoid the problem of low strength of the cell holder caused by the exposure of the glass fiber 100 or carbon fiber 200.

[0062] Specifically, inject the resin onto the glass fiber 100 or carbon fiber 200, and heat the resin to a molten state, and process a boss on the inner wall of the pressure relief hole through a boss mold. At this time, the molten resin is mixed with the glass fiber 100 or carbon fiber 200 into one body and forms a second pressure relief hole 310 at the position of the first pressure relief hole 110. At this time, the first pressure relief hole 110 and the second pressure relief hole 310 jointly enclose a pressure relief hole for supporting the cylindrical cell. The hollow position in the pressure relief hole is the pressure relief position when the cylindrical cell undergoes thermal runaway, and there is no glass fiber 100 and carbon fiber 200 here; the bosses of the pressure relief hole and the connecting part 320 on the resin part 300 both have glass fiber 100 or carbon fiber 200. It can be understood that the boss mold in this embodiment belongs to a conventional component, and its structure and working principle will not be elaborated here.

[0063] Furthermore, the ratio of the injection volume of the resin to the volume of the glass fiber 100 or carbon fiber 200 in this embodiment is 5:1 to 20:1, so as to improve the mechanical strength of the cell holder on the basis of ensuring good fusion of the resin and the glass fiber 100 or carbon fiber 200 and avoiding the exposure of the glass fiber 100 or carbon fiber 200.

[0064] Exemplarily, the ratio of the injection volume of the resin to the volume of the glass fiber 100 or carbon fiber 200 can be set to ratios such as 5:1, 10:1, 15:1, 20:1, etc. When the ratio is less than 5:1, it is possible that the glass fiber 100 or carbon fiber 200 is exposed, reducing the mechanical strength of the cell holder; when the ratio is greater than 20:1, the thickness of the prepared cell holder is too thick, not only wasting the cost of the resin, but also additionally occupying the internal volume of the battery pack, which is not conducive to improving the energy density of the battery pack.

[0065] Optionally, the heating temperature of the resin in this embodiment is set between 225°C and 250°C. Since the melting temperature of the glass fiber 100 is 700°C to 900°C, and the melting temperature of the carbon fiber 200 is usually above 2500°C, setting the heating temperature of the resin to 225°C to 250°C can not only ensure that the resin can be melted and integrally formed with the glass fiber 100 or carbon fiber 200, but also ensure that the glass fiber 100 and carbon fiber 200 are not damaged, saving energy consumption and improving work efficiency.

[0066] The preparation method of the above-mentioned battery cell bracket is simple. It is formed by integrally injecting resin and glass fiber 100 or carbon fiber 200, and can process and form large-sized battery cell brackets. Furthermore, there is no need for the splicing process in the prior art, which improves work efficiency and saves costs. At the same time, the battery cell bracket in this embodiment has high mechanical strength and can extend the service life.

[0067] This embodiment also provides a battery pack, which includes cylindrical battery cells and the above-mentioned battery cell bracket, and the cylindrical battery cells are arranged on the battery cell bracket. Specifically, a plurality of pressure relief holes are provided on the battery cell bracket, and a plurality of cylindrical battery cells are provided, and each cylindrical battery cell is correspondingly arranged in a pressure relief hole.

[0068] Since the battery pack has the above-mentioned battery cell bracket, the battery pack has the characteristics of high processing efficiency, high strength and low cost.

[0069] This embodiment also provides an electrical device, which includes the above-mentioned battery pack. The electrical device has the characteristics of high processing efficiency, high strength and low cost.

[0070] Obviously, the above are only the preferred embodiments of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments here, and various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

[0071] Note that in the description of this specification, the descriptions referring to terms such as "some embodiments", "other embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

Claims

1. A battery cell support, characterized in that: include: A substrate and a coating layer coated on the outside of the substrate; The substrate comprises glass fiber (100) or carbon fiber (200); a first pressure relief hole (110) is provided on the glass fiber (100) or the carbon fiber (200); The coating layer comprises a resin part (300); a second pressure relief hole (310) is provided on the resin part (300); the first pressure relief hole (110) and the second pressure relief hole (310) overlap with each other to form a pressure relief hole for supporting a cylindrical battery core.

2. The battery cell support according to claim 1, characterized in that: The pressure relief holes are provided in plurality, the plurality of pressure relief holes are arranged in an array, and the pressure relief holes penetrate through two opposite sides of the battery cell support.

3. The battery cell support according to claim 2, characterized in that: A connecting portion (320) is provided between two adjacent pressure relief holes, and the glass fiber (100) or the carbon fiber (200) is provided inside the connecting portion (320).

4. The battery cell support according to any one of claims 1 to 3, characterized in that: The inner wall of the pressure relief hole is provided with a boss, and the boss is configured to support the cylindrical battery core; the glass fiber (100) or the carbon fiber (200) is contained inside the boss.

5. The battery cell support according to any one of claims 1 to 3, characterized in that: The glass fiber (100) is formed by arranging a plurality of glass fiber strips, and the extension directions of the plurality of glass fiber strips are all the same; or, the carbon fiber (200) is formed by arranging a plurality of carbon fiber strips, and the extension directions of the plurality of carbon fiber strips are all the same.

6. The battery cell support according to claim 5, characterized in that: Two adjacent glass fiber strips or two adjacent carbon fiber strips are arranged at an interval, and the interval is set between 0 mm and 2 cm.

7. The battery cell support according to claim 6, characterized in that: Two adjacent glass fiber strips or two adjacent carbon fiber strips are arranged at equal intervals.

8. The battery cell support according to claim 1, characterized in that: The pressure relief holes are arranged in multiple rows, and the pressure relief holes in two adjacent rows are staggered.

9. The battery cell support according to claim 1, characterized in that: The pressure relief hole is circular or square.

10. A battery pack, characterized in that: The battery pack comprises a cylindrical battery cell and a battery cell holder according to any one of claims 1 to 9, wherein the cylindrical battery cell is arranged on the battery cell holder.

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