Battery pack plate body structure and battery pack

Abstract

The utility model provides a battery pack plate body structure and battery pack wherein the battery pack plate body structure comprises a first reinforcing layer and a second reinforcing layer, the first reinforcing layer has a corrugated structure, and the second reinforcing layer has a lattice structure. The lattice structure is formed by extending a plurality of layers of polygonal structures which are sequentially sleeved and connecting parts for connecting inflection points of two adjacent layers of polygonal structures along a direction vertical to the thickness direction of the battery pack plate body structure, and the first reinforcing layer and the second reinforcing layer are arranged along the thickness direction of the battery pack plate body structure. The battery pack bottom plate solves the problem that the battery pack bottom plate in the prior art is easy to damage due to extrusion and the like.

Description

Technical Field

[0001] The utility model relates to the field of battery pack protection structures, and in particular to a battery pack plate structure and a battery pack. Background Art

[0002] With the rapid development of new energy electric vehicles, there are many factors that cause electric vehicle fires. In particular, when the battery pack in the electric vehicle is squeezed or impacted from the outside, the impact force is easily transmitted to the battery in the battery pack, causing the battery to short-circuit, thereby causing the battery pack to catch fire. There are many cases of electric vehicle fires. At present, during the driving of electric vehicles, there may be obstacles on the road that cause the battery pack in the electric vehicle to be squeezed or impacted from the bottom, thus causing the battery pack to catch fire. It can be seen that the existing battery pack has the problem of being easily caught fire due to squeezing at the bottom. Utility Model Content

[0003] The main purpose of the utility model is to provide a battery pack plate structure and a battery pack, so as to solve the problem in the prior art that the bottom of the battery pack is easily damaged due to squeezing.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a battery pack plate structure is provided, including a first reinforcement layer and a second reinforcement layer, the first reinforcement layer having a corrugated structure, the second reinforcement layer having a lattice structure, the lattice structure being formed by a plurality of polygonal structures arranged in sequence and a connecting portion connecting the inflection points of two adjacent layers of polygonal structures extending in a direction perpendicular to the thickness direction of the battery pack plate structure, and the first reinforcement layer and the second reinforcement layer are arranged along the thickness direction of the battery pack plate structure. It is particularly noted that in this embodiment, there is no restriction on the number of lattice structures in the second reinforcement layer and the number of corrugated structures in the first reinforcement layer, and both can be one or more.

[0005] Furthermore, the first reinforcement layer includes a plurality of reinforcement segments, and along a direction perpendicular to the thickness direction of the battery pack plate structure, the reinforcement segments are sequentially connected end to end to form a bending structure, and the bending structure forms a corrugated structure.

[0006] Furthermore, the reinforcement section is a straight line section, and the bending structure is a broken line structure; or the reinforcement section is a curved section, and the bending structure is a wave structure.

[0007] Furthermore, the polygonal structure is a regular polygonal structure.

[0008] Furthermore, the multiple layers of polygonal structures sequentially arranged include two layers of a first regular quadrilateral structure and a second regular quadrilateral structure sequentially arranged, the second regular quadrilateral structure is located inside the first regular quadrilateral structure, there are four connecting parts, and the four inflection points of the first regular quadrilateral structure and the four inflection points of the second regular quadrilateral structure are connected one by one through the four connecting parts.

[0009] Furthermore, the sides of the first regular quadrilateral structure and the second regular quadrilateral structure correspond to each other one by one and are arranged in parallel and equidistantly.

[0010] Furthermore, at least one of the first reinforcement layer and the second reinforcement layer is provided with multiple layers, and the first reinforcement layers and the second reinforcement layers are alternately arranged in sequence along the thickness direction of the battery pack plate structure.

[0011] Furthermore, the battery pack plate structure also includes a liquid cooling layer, which has a flow channel for a cooling medium to pass through. The liquid cooling layer, the first reinforcement layer and the second reinforcement layer are arranged along the thickness direction of the battery pack plate structure, and the liquid cooling layer is located at the outermost layer of the battery pack plate structure.

[0012] Furthermore, the liquid cooling layer, the first reinforcement layer and the second reinforcement layer are integrally formed; and / or at least one of the liquid cooling layer, the first reinforcement layer and the second reinforcement layer is a metal part.

[0013] According to another aspect of the present invention, a battery pack is provided, including a bottom plate structure, and the bottom plate structure is the above-mentioned battery pack plate structure.

[0014] By applying the technical solution of the utility model, the first reinforcement layer and the second reinforcement layer are arranged inside the battery pack plate structure, so that the strength of the battery pack plate structure is enhanced and the impact resistance is enhanced, thereby reducing the energy transmitted to the battery in the battery pack, avoiding the battery from short-circuiting due to external impact, and greatly reducing the probability of battery fire. Specifically, the corrugated structure of the first reinforcement layer is arranged between the upper and lower surfaces of the battery pack plate structure, which has the function of shock absorption and impact resistance, and enhances the impact resistance of the battery pack plate structure; the second reinforcement layer is located above or below the first reinforcement layer, and the lattice structure of the second reinforcement layer can greatly improve the structural strength of the battery pack plate structure. In this way, the two parts of the structure cooperate with each other. When the battery pack is impacted, the impact resistance and shock absorption ability of the first reinforcement layer reduces the extrusion impact force on the battery, and the structural strength of the second reinforcement layer further reduces the extrusion impact force on the battery, thereby greatly reducing the probability of battery fire. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0016] Figure 1 A cross-sectional view of a battery pack box of the present utility model is shown;

[0017] Figure 2 A partial enlarged view of the battery pack plate structure is shown.

[0018] The above drawings include the following reference numerals:

[0019] 10. First reinforcement layer; 11. Reinforcement section; 20. Second reinforcement layer; 21. First regular quadrilateral structure; 22. Second regular quadrilateral structure; 23. Connecting part; 30. Liquid cooling layer. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0021] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0022] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0023] In order to solve the problem in the prior art that the bottom of a battery pack is easily damaged due to squeezing, the utility model provides a battery pack plate structure and a battery pack.

[0024] like Figure 1 , Figure 2 The battery pack board structure shown includes a first reinforcement layer 10 and a second reinforcement layer 20. The first reinforcement layer 10 has a corrugated structure, and the second reinforcement layer 20 has a lattice structure. The lattice structure is formed by multiple layers of polygonal structures arranged in sequence and a connecting portion 23 connecting the inflection points of two adjacent layers of polygonal structures extending in a direction perpendicular to the thickness direction of the battery pack board structure. The first reinforcement layer 10 and the second reinforcement layer 20 are arranged along the thickness direction of the battery pack board structure.

[0025] This embodiment provides a first reinforcing layer 10 and a second reinforcing layer 20 inside the battery pack plate structure, so that the strength and impact resistance of the battery pack plate structure are enhanced, thereby reducing the energy transmitted to the battery in the battery pack, avoiding short circuit of the battery due to external impact, and greatly reducing the probability of battery fire. Specifically, the corrugated structure of the first reinforcing layer 10 is arranged between the upper and lower surfaces of the battery pack plate structure, has the function of shock absorption and impact resistance, and enhances the impact resistance of the battery pack plate structure. The second reinforcing layer 20 is located above or below the first reinforcing layer 10, and the lattice structure of the second reinforcing layer 20 can greatly improve the structural strength of the battery pack plate structure. In this way, the two parts of the structure cooperate with each other. When the battery pack is impacted, the impact resistance and shock absorption ability of the first reinforcing layer 10 reduces the extrusion impact force on the battery, and the structural strength of the second reinforcing layer 20 further reduces the extrusion impact force on the battery, which can greatly reduce the probability of battery fire.

[0026] This embodiment is described by taking the battery pack plate structure as a bottom plate structure as an example, in which the thickness direction of the first reinforcement layer 10 and the second reinforcement layer 20 is the vertical direction, and they are stacked up and down. Of course, the battery pack plate structure can also be used as a component in other positions such as a side plate and a top plate.

[0027] like Figure 2 As shown, in this embodiment, the first reinforcement layer 10 includes a plurality of reinforcement segments 11, and along a direction perpendicular to the thickness direction of the battery pack board structure, each reinforcement segment 11 is connected end to end in sequence to form a bending structure, and the bending structure forms a corrugated structure. In this embodiment, specifically along the width direction, each reinforcement segment 11 is connected end to end in sequence to form a bending structure, and the corrugated structure extends from one side surface of the battery pack board structure to the opposite side surface along the width direction, and penetrates the battery pack board structure along the length direction to form a plurality of cavities that penetrate the battery pack board structure, so that the projection of the first reinforcement layer 10 on the upper surface of the battery pack board structure can cover the upper surface of the battery pack board structure. In this way, when any position on the upper or lower surface of the battery pack board structure is impacted, the first reinforcement layer 10 can absorb shock and energy, thereby reducing the impact of the impact force on the battery cell. Figure 2 Taking the direction in as an example, the width direction is the left-right direction, the thickness direction is the up-down direction, and the length direction is the front-back direction.

[0028] In this embodiment, the reinforcement section 11 is set as a straight section, and accordingly, the bending structure is a folded line structure. Of course, the reinforcement section 11 can also be set as a curved section, in which case the bending structure is a wave structure. The entity structure formed by the above-mentioned folded line structure and wave structure can form multiple chambers inside the battery pack plate structure, which can reduce shock and energy while reducing weight and dissipating heat.

[0029] like Figure 2As shown, the polygonal structure in this embodiment is a regular polygonal structure, a plurality of lattice structures are arranged along the width direction, and the lattice structure extends through the battery pack plate structure along the length direction, and the formed second reinforcement layer 20 is arranged above or below the first reinforcement layer 10, and has the same projection area as the first reinforcement layer 10 on the upper and lower surfaces of the battery pack plate structure, so that no matter which position of the battery pack plate structure is impacted by external force, the lattice structure can play an impact-resistant role to reduce the impact of the impact on the battery cell.

[0030] The multi-layer polygonal structure in this embodiment includes two layers of first regular quadrilateral structures 21 and second regular quadrilateral structures 22, the second regular quadrilateral structure 22 is located in the first regular quadrilateral structure 21, the number of connecting parts 23 is 4, and the 4 inflection points of the first regular quadrilateral structure 21 and the 4 inflection points of the second regular quadrilateral structure 22 are connected one by one through the 4 connecting parts 23, that is, each connecting part 23 connects a vertex of the first regular quadrilateral structure 21 and a vertex of the second regular quadrilateral structure 22, and the number of connecting parts 23 is 4. The four vertices of a regular quadrilateral structure 21 are respectively connected to four connecting parts 23, and the second regular quadrilateral structure 22 is also respectively connected to the four connecting parts 23 so that each vertex of the first regular quadrilateral structure 21 is connected to a vertex of the second regular quadrilateral structure 22 through the connecting part 23, forming a body-centered cubic lattice structure, so that the lattice structure has a strength several times that of a lattice object frame, thereby enhancing the impact resistance of the second reinforcement layer 20, which can increase the impact resistance of the battery pack plate structure and greatly reduce the impact of the impact on the battery cell.

[0031] In this embodiment, the sides of the first regular quadrilateral structure 21 and the second regular quadrilateral structure 22 correspond to each other one by one and are arranged in parallel and equidistantly, that is, the first regular quadrilateral structure 21 has the same geometric center as the second regular quadrilateral structure 22 and the corresponding sides are parallel, so that the lattice structure has a strictly symmetrical structure, and the thickness of the lattice structure can be adjusted as needed.

[0032] It should be noted that the corrugated structure and lattice structure of this embodiment can be realized by digging holes or 3D printing during processing. For example, when digging holes, the part around the reinforcing section 11 of the corrugated structure can be dug out, so as to leave the solid reinforcing section 11, and then the reinforcing section 11 cooperates with the solid structure above and below to form a corrugated structure; similarly, the part between the side surfaces of the first regular quadrilateral structure 21 and the second regular quadrilateral structure 22 in the lattice structure is dug out, leaving only the part of the line between the inflection points, which can be used as the connecting part 23, and the part left as a whole is the lattice structure. The dug out part exists as the aforementioned chamber.

[0033] This embodiment takes the battery pack plate structure laid flat as an example, the corrugated structure extends along the width direction, and the lattice structure extends along the length direction. Of course, the specific setting method is not limited to the above-mentioned method in this embodiment, and the lattice structure can also be formed in both the length direction and the width direction, the corrugated structure can be formed in the length direction or the width direction, or the corrugated structure and the lattice structure can be formed only in the length direction or only in the width direction, or the corrugated structure and the lattice structure can be formed in the direction that is angled with the length direction and the width direction, which are not listed here one by one.

[0034] In this embodiment, at least one of the first reinforcement layer 10 and the second reinforcement layer 20 is provided with multiple layers, and each of the first reinforcement layer 10 and the second reinforcement layer 20 is alternately arranged in sequence along the thickness direction of the battery pack plate structure, that is, when subjected to impact force, the first reinforcement layer 10 and the second reinforcement layer 20 alternately absorb energy and reduce shock. In this embodiment, the first reinforcement layer 10 is provided with two layers, the second reinforcement layer 20 is provided with one layer, and the second reinforcement layer 20 is arranged between the two layers of the first reinforcement layer 10. In this way, when the bottom of the battery pack plate structure is impacted, the bottom first reinforcement layer 10 of the battery pack plate structure can absorb energy and deform. When the impact force is greater, the lattice structure of the second reinforcement layer 20 can absorb the vibration and deformation caused by the impact, thereby causing the second reinforcement layer 20 to collapse. When the impact force reaches the maximum, the top first reinforcement layer 10 can absorb energy again. Of course, the specific number of layers can be adjusted accordingly as needed.

[0035] The battery pack plate structure in this embodiment also includes a liquid cooling layer 30, which has a flow channel for cooling medium to pass through. The liquid cooling layer 30, the first reinforcement layer 10 and the second reinforcement layer 20 are arranged along the thickness direction of the battery pack plate structure, and the liquid cooling layer 30 is located at the outermost layer of the battery pack plate structure. Specifically, the liquid cooling layer 30 is arranged on the upper surface or lower surface of the battery pack plate structure, and the first reinforcement layer 10 and the second reinforcement layer 20 are arranged in sequence along the thickness direction of the battery pack plate structure. The first reinforcement layer 10 and the second reinforcement layer 20 are arranged alternately, and the number of layers is set as required. The liquid cooling layer 30 has good thermal conductivity and heat preservation functions, which can ensure the consistency of the temperature at the bottom of the battery cell, and is arranged adjacent to the first reinforcement layer 10 to prevent metal objects brought by the lattice structure from entering the liquid cooling layer 30. In this embodiment, the liquid cooling layer 30 is arranged near the upper surface of the battery pack plate structure, adjacent to the first reinforcement layer 10, and the good thermal conductivity enables the liquid cooling layer 30 to operate quickly when necessary to ensure the consistency of the temperature at the bottom of the battery cell. The outermost layer mentioned in this embodiment is relative to the plate body of the battery pack plate structure itself, that is, the liquid cooling layer 30 is located on either side of the two outermost sides of the battery pack plate structure, or is provided on both sides, and is not relative to the inside and outside of the battery pack. In the battery pack, in order to achieve efficient heat exchange between the liquid cooling layer 30 and the battery, the liquid cooling layer is usually provided on the side of the battery pack plate body close to the battery.

[0036] The liquid cooling layer 30, the first reinforcement layer 10 and the second reinforcement layer 20 in this embodiment are integrally formed to enhance the strength and stability of the battery pack plate structure. At the same time, at least one of the liquid cooling layer 30, the first reinforcement layer 10 and the second reinforcement layer 20 in this embodiment is a metal part, and preferably all of the above parts are metal parts. The metal parts can be made of aluminum or other metal materials. Compared with other materials such as plastics, metals have higher structural strength, so that the overall structural strength can be ensured while absorbing the huge impact brought by the bottom through different structures, thereby ensuring that the battery cells are minimally affected by external forces, and further enhancing the strength of the battery pack plate structure.

[0037] This embodiment also provides a battery pack, including a bottom plate structure, which is the above-mentioned battery pack plate structure. This structure greatly improves the structural strength. Specifically, when the bottom of the battery pack is impacted, the battery pack plate structure is impacted, and the outermost first reinforcement layer 10 of the battery pack plate structure can absorb energy and deform. When the impact force is greater, the lattice structure of the second reinforcement layer 20 can absorb the vibration and deformation caused by the impact, so that the lattice structure collapses. When the impact force reaches the maximum, the top first reinforcement layer 10 can absorb energy again. In this way, the structural strength below the battery cell can be greatly improved, and when the bottom of the electric vehicle and other equipment receives a spherical impact, the energy is absorbed through the unique structure, so that the battery cell is subjected to the minimum degree of extrusion force, and finally the probability of battery fire is greatly reduced or even 0. At the same time, the upper first reinforcement layer 10 can also prevent the metal objects brought by the second reinforcement layer 20 from entering the upper liquid cooling layer 30. The good thermal conductivity of the upper liquid cooling layer 30 enables the bottom of the battery cell to maintain temperature consistency. Of course, in addition to using the above-mentioned battery pack board structure on the bottom plate structure, the above-mentioned battery pack board structure can also be used in the side plate structure, top plate structure and other positions.

[0038] It should be noted that, the multiple in the above embodiments refers to at least two.

[0039] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects: the strength of the battery pack plate structure is enhanced, the impact resistance and shock absorption capabilities are enhanced, and the probability of battery fire is greatly reduced;

[0040] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0041] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0042] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0043] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A battery pack plate structure, characterized in that: include: A first reinforcement layer (10), wherein the first reinforcement layer (10) has a corrugated structure; A second reinforcing layer (20), wherein the second reinforcing layer (20) has a lattice structure, wherein the lattice structure is formed by a plurality of polygonal structures which are sequentially nested, and a connecting portion (23) connecting the inflection points of two adjacent layers of the polygonal structures, extending in a direction perpendicular to the thickness direction of the battery pack plate structure, and the first reinforcing layer (10) and the second reinforcing layer (20) are arranged in the thickness direction of the battery pack plate structure.

2. The battery pack plate structure according to claim 1, characterized in that: The first reinforcement layer (10) comprises a plurality of reinforcement segments (11), and along a direction perpendicular to the thickness direction of the battery pack plate structure, the reinforcement segments (11) are sequentially connected end to end to form a bent structure, and the bent structure forms the corrugated structure.

3. The battery pack plate structure according to claim 2, characterized in that: The reinforcement section (11) is a straight section, and the bending structure is a broken line structure; or the reinforcement section (11) is a curved section, and the bending structure is a wave structure.

4. The battery pack plate structure according to claim 1, characterized in that: The polygonal structure is a regular polygonal structure.

5. The battery pack plate structure according to claim 1, characterized in that: The multi-layer polygonal structure sequentially arranged comprises two layers of a first regular quadrilateral structure (21) and a second regular quadrilateral structure (22) sequentially arranged, the second regular quadrilateral structure (22) being located inside the first regular quadrilateral structure (21), the number of the connecting parts (23) being four, and the four inflection points of the first regular quadrilateral structure (21) and the four inflection points of the second regular quadrilateral structure (22) being connected one by one via the four connecting parts (23).

6. The battery pack plate structure according to claim 5, characterized in that: The side edges of the first regular quadrilateral structure (21) and the second regular quadrilateral structure (22) correspond one to one and are arranged in parallel and equidistantly.

7. The battery pack plate structure according to any one of claims 1 to 6, characterized in that: At least one of the first reinforcement layer (10) and the second reinforcement layer (20) is provided with multiple layers, and each of the first reinforcement layer (10) and the second reinforcement layer (20) is alternately arranged in sequence along the thickness direction of the battery pack plate structure.

8. The battery pack plate structure according to any one of claims 1 to 6, characterized in that: The battery pack plate structure also includes a liquid cooling layer (30), the liquid cooling layer (30) having a flow channel for a cooling medium to pass through, the liquid cooling layer (30), the first reinforcement layer (10) and the second reinforcement layer (20) are arranged along the thickness direction of the battery pack plate structure, and the liquid cooling layer (30) is located at the outermost layer of the battery pack plate structure.

9. The battery pack plate structure according to claim 8, characterized in that: The liquid cooling layer (30), the first reinforcement layer (10) and the second reinforcement layer (20) are integrally formed; and / or At least one of the liquid cooling layer (30), the first reinforcement layer (10) and the second reinforcement layer (20) is a metal part.

10. A battery pack, characterized in that: It includes a bottom plate structure, and the bottom plate structure is the battery pack plate structure according to any one of claims 1 to 9.

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