Protective part, battery pack and electric equipment

Abstract

The utility model relates to a protection part, a battery pack and electric equipment, the protection part comprises a body, a cavity is arranged in the body, a plurality of buffer capsules are arranged in the cavity, each buffer capsule comprises a wrapping layer, and the wrapping layers of at least part of the buffer capsules are filled with a first buffer medium. The protective part in the embodiment of the utility model is better in buffering performance, can provide a better protective effect, and avoids deformation when being impacted.

Description

Technical Field

[0001] The present application relates to the technical field of battery pack protection, and in particular to a protective component, a battery pack and an electrical device. Background Art

[0002] At present, the bottom protection structure of the battery pack is generally composed of a tray bottom plate, a buffer structure and a composite fiberglass board. The protection structure is mainly used to reduce the damage caused by impact on the bottom of the battery pack.

[0003] In the related art, although it can provide certain buffering and protection effects, the bottom protection structure of the battery pack is prone to damage and deformation, thereby affecting its protection effect on the battery pack. Utility Model Content

[0004] The present application is proposed to solve the above-mentioned problems. According to one aspect of the present application, a protective member is provided, which includes a main body, a cavity is arranged in the main body, a plurality of buffer capsules are arranged in the cavity, and the buffer capsules include a wrapping layer, and the wrapping layer of at least part of the buffer capsules is filled with a first buffer medium.

[0005] Exemplarily, a plurality of the buffer capsules having the same volume are arranged in the cavity.

[0006] Exemplarily, the buffer capsules are evenly arranged in the cavity.

[0007] Exemplarily, a plurality of buffer capsules with different volumes are arranged in the cavity.

[0008] Exemplarily, the cavity includes a first region and a second region, and the buffer capsules are distributed in the first region and the second region; wherein the buffer capsules in the first region and the second region have different volumes and / or distribution densities.

[0009] Exemplarily, a volume of the buffer capsule in the second region is greater than a volume of the buffer capsule in the first region.

[0010] Exemplarily, a distribution density of the buffer capsules in the second region is smaller than a distribution density of the buffer capsules in the first region.

[0011] Exemplarily, the second area is arranged around the first area.

[0012] Exemplarily, the first buffer medium is a non-Newtonian fluid.

[0013] Exemplarily, the cavity is filled with a second buffer medium.

[0014] Exemplarily, the second buffer medium is a gas or a non-Newtonian fluid.

[0015] Exemplarily, the body comprises a shell, and the cavity is disposed within the shell.

[0016] According to another aspect of the present application, a battery pack is provided, comprising a tray, a battery assembly and the above-mentioned protective member, wherein the protective member is connected to the tray.

[0017] According to another aspect of the present application, an electric device is provided, wherein the electric device includes the above-mentioned battery pack.

[0018] The protective member in the present application has a cavity arranged inside the protective member, and a plurality of buffer capsules in contact with each other are arranged in the cavity. Buffering is achieved by the buffer capsules and the buffer medium filled therein, and the protective member can protect the equipment that needs to be protected; the buffering effect is achieved by the buffer capsules and the buffer medium filled therein, and the protective member is not prone to deformation and damage, and can provide better protection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] By describing the embodiments of the present application in more detail in conjunction with the accompanying drawings, the above and other purposes, features and advantages of the present application will become more apparent. The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0020] Figure 1 A structural schematic diagram of a first arrangement of buffer capsules of a protective element in Embodiment 1 of the present application is shown.

[0021] Figure 2 A structural schematic diagram of a second arrangement of the buffer capsules of the protective element in the first embodiment of the present application is shown.

[0022] Figure 3 A structural schematic diagram of a third arrangement of the buffer capsules of the protective element in the first embodiment of the present application is shown.

[0023] Figure 4 A schematic diagram showing the relationship between the shear force and the shear strain rate of the buffer medium in Example 1 of the present application is shown.

[0024] Figure 5 A schematic diagram of the structure of the battery pack in the second embodiment of the present application is shown.

[0025] Figure numerals: 1. main body; 2. buffer capsule; 21. wrapping layer; 22. first buffer medium; 3. tray; 4. battery assembly; 5. tray bottom plate; 6. thermal conductive adhesive; 7. seal; 8. protective plate. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present application more obvious, the example embodiments according to the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application, and it should be understood that the present application is not limited to the example embodiments described herein. Based on the embodiments of the present application described in the present application, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present application.

[0027] Embodiment 1

[0028] like Figure 1 As shown, an embodiment of the present application provides a protective member, which includes a main body 1, a cavity is provided in the main body 1, a plurality of buffer capsules 2 are provided in the cavity, the buffer capsules 2 include a wrapping layer 21, at least a portion of the wrapping layer 21 is filled with a first buffer medium 22.

[0029] The protective member in the present application has a cavity arranged inside the protective member, and a plurality of buffer capsules in contact with each other are arranged in the cavity. Buffering is achieved by the buffer capsules and the buffer medium filled therein, and the protective member can protect the equipment that needs to be protected; the buffering effect is achieved by the buffer capsules and the buffer medium filled therein, and the protective member is not prone to deformation and damage, and can provide better protection effect.

[0030] Exemplarily, the protective member in the embodiment of the present application is used for a battery pack, and the body 1 of the protective member is connected to the battery pack and covers the battery cells of the battery pack to protect the battery cells.

[0031] For example, adjacent buffer capsules 2 in the cavity are in contact with each other. The arrangement of the buffer capsules 2 in the cavity can be selected according to actual needs. Figure 1 In the arrangement shown, a plurality of buffer capsules 2 of different volumes are arranged in the cavity. The larger the volume of the buffer capsule 2 is, the larger the area of ​​the wrapping layer 21 is, and the more first buffer medium 22 is filled. Figure 1 The buffer capsules 2 are randomly and freely distributed in the entire cavity. Two adjacent buffer capsules 2 are in contact with each other, and the wrapping layer 21 of the buffer capsule 2 located at the edge is also in contact with the inner wall of the main body 1. The advantage of this arrangement is that the process of injecting the buffer capsule 2 into the cavity is very simple and convenient, and the required buffer capsule 2 can be directly injected into the cavity through the opening. Exemplarily, an opening is provided on the main body 1 that connects the cavity and the outside of the main body 1, which is used to inject the buffer capsule 2 into the cavity. When there is no additional requirement for the protective function of the protective element, it can be used Figure 1 The arrangement shown makes the assembly process simpler and more convenient.

[0032] like Figure 2 As shown, it is a second arrangement of the buffer capsules 2 in the embodiment of the present application. The cavity of the main body 1 includes a plurality of buffer capsules 2 of the same volume, and the buffer capsules 2 are evenly arranged in the cavity. Exemplarily, the plurality of buffer capsules 2 in the cavity are stacked and arranged in multiple layers, and the buffer capsules 2 in each layer are arranged in a rectangular array until the entire cavity is filled. Two adjacent buffer capsules 2 are in contact with each other, and the buffer capsules 2 at the edges are in contact with the inner wall of the cavity, thereby forming a whole to provide a buffering effect of the protective element. Exemplarily, if the single volume of the buffer capsule 2 is large, the buffer capsule 2 can be arranged in only one layer in the cavity, and the buffer capsules 2 are arranged in a single-layer rectangular array.

[0033] When the impact force on the bottom of the battery pack is the same in each direction, this arrangement can more evenly disperse the effect of the external impact force on the battery pack components, and effectively avoid the problem of excessive differences in regional buffering effects. In addition, with this arrangement, the structure inside the protective member will be relatively stable. During use, the buffer capsule 2 is not prone to positional displacement. During the production process, buffer capsules 2 of uniform size are also easier to generate and manufacture. Exemplarily, buffer capsules 2 of the same volume can also be randomly and freely arranged in the cavity.

[0034] like Figure 3 As shown, it is the third arrangement mode of the buffer capsules 2 in the embodiment of the present application. A plurality of buffer capsules 2 of different volumes are arranged in the cavity. However, the buffer capsules 2 are not randomly and freely distributed in the cavity. Instead, a plurality of buffer capsules 2 of different sizes are distributed based on the different magnitudes of impact forces received by different regions of the battery pack assembly or the probability of being received by external impact forces. If the impact force received by the region is relatively large or it is more susceptible to external impact, the number of buffer capsules 2 distributed in the region is large and the volume is small, while the number of buffer capsules 2 distributed in other regions is small and the volume is large. That is, in regions that are subject to greater impact forces (impact probability), the buffer capsules 2 are arranged with a greater density and a smaller volume.

[0035] by Figure 3Taking the area in as an example, the cavity includes a first area and a second area, and the buffer capsules in the first area and the second area have different volumes or distribution densities. In some embodiments, the volumes and distribution densities of the buffer capsules in the first area and the second area are different. Exemplarily, the volume of the buffer capsule 2 in the second area is greater than the volume of the buffer capsule 2 in the first area, and the distribution density of the buffer capsule 2 in the second area is less than the distribution density of the buffer capsule 2 in the first area. Among them, the external impact force received by the first area is greater than the impact force received by the second area, or the probability of the first area being impacted is greater than the probability of the second area being impacted. In some embodiments, the external impact force received by the first area and the probability of being impacted are both greater than the impact force received by the second area. Exemplarily, the second area can be arranged around the first area.

[0036] Figure 3 The middle area of ​​the battery pack and the protective member shown in the figure is more susceptible to external impact, and the edge part is less susceptible to external impact, so the position near the edge is divided into the second area, and the area near the middle is divided into the first area, and the second area (i.e., the edge area) is arranged around the first area (i.e., the middle area). The number of buffer capsules 2 distributed in the first area is large and the volume is relatively small, whereas the number of buffer capsules 2 distributed in the second area is small and the volume is large.

[0037] Because the arrangement of the buffer capsules 2 takes into account the magnitude and probability of the impact force on the protective member and the battery pack, such an arrangement can better cope with external impacts. The middle area of ​​the protective member is more susceptible to impact, and using more buffer capsules 2 can provide more sufficient buffering force, thereby improving the protective effect and reducing the possibility of deformation of the protective member.

[0038] Exemplarily, the body 1 of the protective member includes an outer shell, and the cavity is arranged inside the outer shell, and the shape of the outer shell can be a rectangular parallelepiped. The material of the outer shell can be metal or glass fiber composite material, and the tensile strength of the outer shell needs to be greater than 50MPa, and it must have sufficient strength to provide effective protection for the bottom of the battery pack. Preferably, when metal is used as the material of the outer shell, aluminum or stainless steel can be selected, which has good strength and anti-corrosion effect and is more suitable as the material of the outer shell. Exemplarily, other suitable metals or other materials can also be selected according to actual needs to make the outer shell.

[0039] Exemplarily, the first buffer medium 22 filled in the buffer capsule 2 may be a non-Newtonian fluid or MPP (microporous foamed polypropylene), and the first buffer medium 22 provides the buffer capsule 2 with sufficient buffering capacity to cope with external impacts on the protective component.

[0040] like Figure 4As shown, the changing relationship between the shear force and the shear strain rate of the non-Newtonian fluid and the Newtonian fluid in the embodiment of the present application. It can be seen that the changing relationship between the shear force and the shear strain rate of the Newtonian fluid in the figure is linear. In contrast, the changing relationship between the shear force and the shear strain rate of each non-Newtonian fluid is not linear. Therefore, a non-Newtonian fluid is used as the first buffer medium 22 to be filled into the buffer capsule 2. When subjected to external impact, the external impact force exerted on the battery pack assembly can be dispersed. While ensuring the effective buffering performance of the protective member, the anti-deformation ability of the protective member is improved, and the battery assembly 4 (battery cell) can be more effectively protected.

[0041] Exemplarily, the cavity in the embodiment of the present application is also filled with a second buffer medium, and the second buffer medium is a gas or a non-Newtonian fluid. After the filling of the buffer capsule 2 is completed, the second buffer medium in the cavity will contact the outside of the wrapping layer 21 of the buffer capsule 2. While the buffer capsule 2 is used for buffering protection, the second buffer medium can also provide a certain buffering effect. The above-mentioned gas can be air or other gases, preferably an inert gas. When the second buffer medium is air, the buffer capsule 2 can be directly injected into the cavity in a non-vacuum environment. When the second buffer medium is a non-Newtonian fluid, it is necessary to first inject the second buffer medium into the cavity, and then inject the buffer capsule 2 until the entire cavity is filled, and finally the opening on the cavity for injecting the medium needs to be sealed, and finally the protective member in the embodiment of the present application is formed.

[0042] The protective member in the present application has a cavity arranged inside the protective member, and a plurality of buffer capsules in contact with each other are arranged in the cavity. Buffering is achieved by the buffer capsules and the buffer medium filled therein, and the protective member can protect the equipment that needs to be protected; the buffering effect is achieved by the buffer capsules and the buffer medium filled therein, and the protective member is not prone to deformation and damage, and can provide better protection effect.

[0043] Embodiment 2

[0044] like Figure 5 As shown, an embodiment of the present application provides a battery pack, which includes a tray 3, a battery assembly 4 and the protective member described in Example 1. The battery assembly 4 is arranged in the tray 3, and the battery assembly 4 includes a plurality of battery cells. The protective member is connected to the tray 3 and covers the battery assembly 4 to provide protection for the battery assembly 4.

[0045] As mentioned above, the protective member includes a body 1, a buffer capsule 2 filled in the cavity of the body 1, wherein the buffer capsule 2 includes a wrapping layer 21 and a first buffer medium 22 filled in the wrapping layer 21. The protective member is connected to the bottom of the tray 3, thereby protecting the bottom of the battery pack to ensure the safety of the battery assembly 4.

[0046] For example, there are two different ways to connect the protective member to the battery pack. One is that the protective member is connected to the battery pack as a separate structure. The other is that the protective member is connected to the battery pack as a part of the battery pack structure to protect the bottom of the battery pack. The two ways are introduced below.

[0047] like Figure 5 As shown, the battery pack further includes a bottom protective plate 8 and a seal 7, the body 1 includes a shell, the shell is disposed between the tray 3 and the protective plate 8, the seal 7 connects the tray 3 and the protective plate 8, and the seal 7 is disposed around the shell. After the assembly is completed, the shell is fixed between the protective plate 8 and the tray 3, thereby providing protection for the battery assembly 4 in the tray 3 together with the bottom protective plate 8.

[0048] Exemplarily, the battery pack also includes a tray bottom plate 5 and a thermally conductive adhesive 6, wherein the tray bottom plate 5 and the thermally conductive adhesive 6 are both located at the bottom of the tray 3. After assembly is completed, the battery assembly 4, the tray bottom plate 5, the thermally conductive adhesive 6, the protective member (main body 1), and the protective plate 8 on the battery pack are arranged in order from top to bottom. The tray bottom plate 5 is installed at the bottom of the tray 3 and supports the battery assembly 4. It is mainly used to enhance the overall mechanical strength and provide further protection for the battery assembly 4. On the one hand, the thermally conductive adhesive 6 is used to connect the tray bottom plate 5 and the protective member. On the other hand, it can also be used for heat transfer of the battery assembly 4 to facilitate maintaining the temperature of the battery assembly 4.

[0049] Exemplarily, the body 1 of the protective member includes an outer shell. Since the protective member needs to protect the entire battery assembly 4, the design of its size is related to the size of the battery assembly 4. Exemplarily, it is confirmed that the length direction and width direction of the entire battery module are the first direction and the second direction, respectively. The size of the battery cell in the first direction is a, and the gap between the battery cells is k. The number of battery cells arranged along the second direction is m, and the size of the battery cell along the second direction is b. Then the size L (length) of the outer shell of the protective member along the first direction should satisfy L>na, and the size S (width) in the second direction should satisfy S>mb. In this way, the size of the protective member is limited so that the protective member will not be too small to provide sufficient protection.

[0050] The second setting method is introduced below. Figure 5 The main body 1 includes a protective plate 8 and a sealing member 7, and the sealing member 7 connects the protective plate 8 and the tray 3 to form a cavity between the tray 3 and the protective plate 8.

[0051] In this way, the protective member does not have a separate housing, but is a part of the body 1 through the protective plate 8 and the seal 7 on the battery pack. The protective plate 8 and the seal 7 are connected to the bottom of the tray 3, and a cavity is formed inside, so that the buffer capsule 2 is filled into the cavity to form a protective member at the bottom of the battery pack. This method does not require the production of a separate protective member, but combines the preparation of the protective member with the assembly of the battery pack, reducing the process of preparing the protective member. Considering the overall sealing, in this method, the second filling medium in the cavity is preferably air.

[0052] An embodiment of the present application further provides an electrical device, which includes the above-mentioned battery pack and is powered by the above-mentioned battery pack.

[0053] The battery pack and electrical equipment in the present application use the above-mentioned protective member to protect the bottom of the battery pack. A cavity is set in the protective member, and a plurality of buffer capsules 2 that are in contact with each other are set in the cavity. Buffering is achieved by the buffer capsules 2 and the buffer medium filled therein. The protective member and the battery pack are connected to protect the battery cells. The protective member in the embodiment of the present application has better buffering performance, can provide better protection effect and avoid deformation when impacted.

[0054] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely exemplary and are not intended to limit the scope of the present application to this. Those of ordinary skill in the art may make various changes and modifications therein without departing from the scope and spirit of the present application. All these changes and modifications are intended to be included within the scope of the present application as required by the appended claims.

[0055] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0056] Similarly, it should be understood that in order to streamline the present application and help understand one or more of the various inventive aspects, in the description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. However, the method of the present application should not be interpreted as reflecting the following intention: the claimed application requires more features than the features clearly stated in each claim. More specifically, as reflected in the corresponding claims, the inventive point is that the corresponding technical problem can be solved with features less than all the features of a single disclosed embodiment. Therefore, the claims following the specific embodiment are hereby explicitly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the present application.

[0057] It will be understood by those skilled in the art that, except for mutually exclusive features, all features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this specification may be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature that provides the same, equivalent or similar purpose.

[0058] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0059] The above is only a specific implementation or description of a specific implementation of the present application, and the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. The protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A protective member, characterized in that: The protective element comprises a body, a cavity is arranged in the body, a plurality of buffer capsules are arranged in the cavity, the buffer capsules comprise a wrapping layer, and the wrapping layer of at least some of the buffer capsules is filled with a first buffer medium.

2. The protective element according to claim 1, characterized in that: A plurality of buffer capsules of the same volume are arranged in the cavity.

3. The protective element according to claim 1, characterized in that: The buffer capsules are evenly arranged in the cavity.

4. The protective element according to claim 1 or 3, characterized in that: A plurality of buffer capsules with different volumes are arranged in the cavity.

5. The protective element according to claim 4, characterized in that: The cavity includes a first area and a second area, and the buffer capsules are distributed in the first area and the second area; wherein the buffer capsules in the first area and the second area have different volumes and / or distribution densities.

6. The protective element according to claim 5, characterized in that: A volume of the buffer capsule in the second region is greater than a volume of the buffer capsule in the first region.

7. The protective element according to claim 5, characterized in that: A distribution density of the buffer capsules in the second region is smaller than a distribution density of the buffer capsules in the first region.

8. The protective element according to any one of claims 5 to 7, characterized in that: The second area is arranged around the first area.

9. The protective element according to any one of claims 1 to 3 and 5 to 7, characterized in that: The first buffer medium is a non-Newtonian fluid.

10. The protective element according to any one of claims 1-3, 5-7, characterized in that: The cavity is filled with a second buffer medium.

11. The protective element according to claim 10, characterized in that: The second buffer medium is gas or non-Newtonian fluid.

12. The protective element according to any one of claims 1 to 3 and 5 to 7, characterized in that: The body includes a housing, and the cavity is disposed within the housing.

13. A battery pack, characterized in that: The battery pack comprises a tray, a battery assembly and the protective member according to any one of claims 1 to 12, wherein the protective member is connected to the tray.

14. An electrical device, characterized in that: The electrical equipment comprises the battery pack according to claim 13.

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