Battery pack and electric equipment

Abstract

The utility model provides a battery pack and electric equipment. The battery pack comprises a supporting plate, a battery cell and a composite insulating component, the battery cell is arranged on the supporting plate and extends in the first direction. The composite insulation assembly is arranged between the battery cell and the supporting plate, the composite insulation assembly comprises at least one first insulation layer and at least one second insulation layer which are connected with each other, and the use temperature of the first insulation layer is higher than that of the second insulation layer. And along the first direction, the end part of the battery cell is positioned in the range of the first insulating layer. In the second direction, the orthographic projection of the at least one first insulating layer corresponds to and overlaps the orthographic projection of at least one end of the battery cell, and the second direction is perpendicular to the first direction. The battery pack disclosed by the utility model has the effects of good insulating property and low manufacturing cost.

Description

Technical Field

[0001] The utility model generally relates to the technical field of batteries, and more specifically to a battery pack and an electrical device. Background Art

[0002] At present, a large amount of electrolyte is generated during the thermal diffusion of the battery pack. After the electrolyte gas condenses near the low-temperature battery cell that is not out of control, it will connect the battery cell to the pallet. After the out-of-control battery cell is connected to the pallet due to the high temperature, it will have the same potential as the pallet. There will be a voltage difference between the uncontrolled battery cell and the pallet. The high-voltage reaction after the condensed electrolyte is connected will damage the insulation structure and cause high-voltage failure. However, the existing low-temperature insulation materials are easily damaged during the thermal diffusion of the battery pack and cannot be insulated, and the large-scale use of high-temperature resistant insulation materials will increase the cost of the battery pack. Utility Model Content

[0003] A series of simplified concepts are introduced in the utility model content section, which will be further described in detail in the detailed implementation section. The utility model content section of the utility model does not mean to attempt to define the key features and essential technical features of the technical solution claimed for protection, nor does it mean to attempt to determine the scope of protection of the technical solution claimed for protection.

[0004] In order to at least partially solve the above problems, the first aspect of the present invention provides a battery pack, the battery pack comprising:

[0005] Pallet;

[0006] A battery cell, wherein the battery cell is disposed on the support plate and extends along a first direction; and

[0007] A composite insulating component, the composite insulating component is arranged between the battery core and the support plate, the composite insulating component comprises at least a first insulating layer and a second insulating layer connected to each other, and the use temperature of the first insulating layer is greater than the use temperature of the second insulating layer;

[0008] Along a second direction, an orthographic projection of the at least one first insulating layer corresponds to and overlaps with an orthographic projection of at least one end of the battery core, and the second direction is perpendicular to the first direction.

[0009] According to the battery pack of the first aspect of the utility model, when heat diffusion occurs in the battery pack, the first insulating layer located at the end of the battery cell can withstand higher temperatures without maintaining insulation, while other positions in the support plate are insulated by the second insulating layer. Therefore, the cooperation of the first insulating layer and the second insulating layer can ensure insulation protection when thermal runaway occurs in the battery pack, and compared with the solution of using the first insulating layer over a large area, the cost of the battery pack is reduced.

[0010] Optionally, the second insulating layer is adhered to the surface of the support plate, and the first insulating layer and the second insulating layer at least partially overlap.

[0011] Optionally, along the first direction, a dimension of the first insulating layer protruding from the battery core is 20 mm to 40 mm.

[0012] Optionally, along the first direction, the overlap between the first insulating layer and the battery core is 20 mm to 40 mm.

[0013] Optionally, a dimension of the first insulating layer along the first direction is 40 mm to 80 mm.

[0014] Optionally, along the first direction, an overlap dimension between the first insulating layer and the end of the battery cell is 2% to 6% of the length of the battery cell.

[0015] Optionally, the battery core is provided with an end surface, and along the first direction, the end surface is located in the middle of the first insulating layer.

[0016] Optionally, the composite insulation assembly includes at least two first insulation layers, at least two first insulation layers are arranged along the first direction, at least part of the second insulation layer is arranged between at least two first insulation layers, and at least two first insulation layers are arranged corresponding to the ends of the battery cell.

[0017] Optionally, the battery pack also includes a cover body, which is arranged to cover the battery cell. The number of the composite insulating components is two, and another composite insulating component is arranged between the battery cell and the cover body. The first insulating layer and the second insulating layer in the two composite insulating components are arranged correspondingly.

[0018] Optionally, the first insulating layer is made of one of PI, PAI, and PBI materials, and / or

[0019] The second insulating layer is one of PET, PC, PP and PVDF.

[0020] A second aspect of the utility model provides an electrical device, comprising the battery pack according to the above.

[0021] The electrical equipment according to the second aspect of the utility model has the effects of good insulation performance and low manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The following drawings of the embodiments of the present invention are used as part of the present invention for understanding the present invention. The drawings show the embodiments of the present invention and their descriptions, and are used to explain the principles of the present invention. In the drawings,

[0023] Figure 1 A schematic diagram of the distribution of a composite insulating component of a battery pack according to a preferred embodiment of the utility model; and

[0024] Figure 2 for Figure 1 A side view of the battery cell along the second direction.

[0025] Description of Reference Numerals

[0026] 100: pallet 101: frame

[0027] 102: separator 110: battery cell

[0028] 111: end 112: end surface

[0029] 120: Composite insulation component 121: First insulation layer

[0030] 122: second insulating layer D1: first direction

[0031] D2: Second direction D3: Third direction DETAILED DESCRIPTION

[0032] In the following description, a large number of specific details are given to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features known in the art are not described.

[0033] In this document, ordinal numbers such as "first" and "second" cited in the present invention are merely identifiers and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term "first component" itself does not imply the existence of the "second component", and the term "second component" itself does not imply the existence of the "first component".

[0034] In this document, “upper”, “lower”, “front”, “back”, “left”, “right”, etc. are only used to indicate the relative position relationship between related parts, rather than to limit the absolute positions of these related parts.

[0035] In this document, “equal”, “same”, etc. are not strictly limited in a mathematical and / or geometric sense, but also include errors that can be understood by those skilled in the art and are allowed in manufacturing or use.

[0036] Unless otherwise stated, the numerical ranges herein include not only the entire range within its two endpoints but also include several sub-ranges contained therein.

[0037] Figure 1 and Figure 2 A battery pack according to the utility model is shown, and the battery pack includes a support plate 100, a battery cell 110, and a composite insulating assembly 120. The battery cell 110 is arranged on the support plate 100, and the battery cell 110 extends along the first direction D1. The composite insulating assembly 120 is arranged between the battery cell 110 and the support plate 100, and the composite insulating assembly 120 includes at least one first insulating layer 121 and a second insulating layer 122 connected to each other, and the use temperature of the first insulating layer 121 is greater than the use temperature of the second insulating layer 122. Wherein, along the first direction D1, the end 111 of the battery cell 110 is located within the range of the first insulating layer 121. Along the second direction D2, the orthographic projection of at least one first insulating layer 121 corresponds to and overlaps with the orthographic projection of at least one end of the battery cell, and the second direction D2 is perpendicular to the first direction D1.

[0038] According to the battery pack of the present invention, when heat diffusion occurs in the battery pack, the first insulating layer 121 located at the end 111 of the battery cell 110 can withstand higher temperatures without maintaining insulation, while other positions in the support plate 100 and parts of the battery cell 110 other than the end are insulated by the second insulating layer 122. Therefore, the cooperation of the first insulating layer 121 and the second insulating layer 122 can ensure insulation protection of the battery pack when thermal runaway occurs, and compared with the solution of using the first insulating layer 121 over a large area, the cost of the battery pack is reduced.

[0039] Reference Figure 1 The battery pack includes a plurality of battery cells 110, and the plurality of battery cells 110 are disposed on the support plate 100, and the plurality of battery cells 110 are arranged at intervals along the third direction D3. Figure 1 As shown, the battery pack according to the present invention includes a frame 101 and a partition 102, the frame 101 is arranged around the circumference of the tray 100, and the partition 102 is arranged in the middle of the tray 100 along the first direction D1 and is located inside the frame 101, thereby dividing the internal space formed by the frame 101 and the tray 100 into two along the first direction D1, which is used to accommodate two groups of battery cells 110 spaced apart along the first direction D1.

[0040] If high temperature resistant insulation measures are not adopted, when the battery pack undergoes thermal diffusion, a large amount of electrolyte will condense at the end 111 of the battery cell 110, resulting in a voltage difference between the battery cell 110 that is not out of control and the support plate 100. The high voltage reaction after the condensed electrolyte is turned on will damage the insulation structure and cause high voltage failure. When the battery pack is in thermal runaway, the temperature at the end 111 of the battery cell 110 can reach 250°C, while the temperature at a location far from the out-of-control end of the battery cell 110 will be below 100°C.

[0041] Therefore, the use of the corresponding composite insulation assembly 120 can reduce the cost of the battery pack while ensuring the high temperature resistant insulation performance of the battery pack.

[0042] Specifically, with regard to the arrangement of the first insulating layer 121 and the second insulating layer 122 in the battery pack, the composite insulating assembly 120 includes at least two first insulating layers 121, at least two first insulating layers 121 are arranged along a first direction D1, at least part of the second insulating layer 122 is disposed between the at least two first insulating layers 121, and at least two first insulating layers 121 are disposed corresponding to the ends of the battery cell 110.

[0043] Reference Figure 1 Taking the composite insulating assembly 120 on the support plate 100 as an example, the composite insulating assembly 120 includes four first insulating layers 121 and two second insulating layers 122, the four first insulating layers 121 are arranged along the first direction D1, the two second insulating layers 122 are arranged along the first direction D1 and are respectively arranged between two adjacent first insulating layers 121 (specifically, one second insulating layer 122 is arranged between the first first insulating layer 121 and the second first insulating layer 121, and the other second insulating layer 122 is arranged between the third first insulating layer 121 and the fourth first insulating layer 121), and the four first insulating layers 121 are arranged one by one at the two ends of the two groups of battery cells 110.

[0044] Optionally, the composite insulating assembly 120 may be hot-pressed onto the support plate 100 , or may be bonded onto the battery cell 110 .

[0045] Optionally, refer to Figure 1 , the second insulating layer 122 is attached to the surface of the support plate 100, and the first insulating layer 121 and the second insulating layer 122 at least partially overlap. The overlap of the first insulating layer 121 and the second insulating layer 122 means that the first insulating layer 121 is at least partially attached to the second insulating layer 122 and fixed to the second insulating layer 122. Figure 2 As shown, along the first direction D1, the dimension L3 of the overlap between the first insulating layer 121 and the end of the battery cell 110 is 2% to 6% of the length L4 of the battery cell 110. This can prevent the large-area investment of the first insulating layer 121 while meeting the high-temperature insulation performance of the battery pack, thereby controlling the cost of the battery pack.

[0046] Preferably, the first insulating layer 121 is integrally bonded to the second insulating layer 122. The overlapping dimension L3 of the first insulating layer 121 and the end of the battery cell 110 along the first direction D1 is 2% to 6% of the length L4 of the battery cell 110. If the length of the battery cell 110 is relatively large, the first insulating layer 121 is limited to 2% to 6% of the length of the battery cell 110. On the basis of meeting the high temperature insulation performance of the battery pack, the large area investment of the first insulating layer 121 is avoided, thereby controlling the cost of the battery pack.

[0047] Specifically, the second insulating layer 122 is attached to the surface of the support plate 100, and the second insulating layer 122 is bonded and fixed to the surface of the support plate 100 by hot pressing. The first insulating layer 121 is integrally attached to the second insulating layer 122 and fixed to the second insulating layer 122 (i.e., the first insulating layer 121 completely overlaps the second insulating layer 122). The second insulating layer 122 is provided so that the inner surface of the support plate 100 has a certain insulation protection, and the first insulating layer 121 is attached to the second insulating layer 122, which will not damage the second insulating layer 122, and will further enhance the high temperature resistance at the attached position.

[0048] In addition, as an alternative, the first insulating layer 121 and the second insulating layer 122 can also be arranged to be spliced ​​at intervals. In other words, the first insulating layer 121 and the second insulating layer 122 do not overlap, and the first insulating layer 121 and the second insulating layer 122 are both hot pressed on the surface of the pallet 100, which can also provide good insulation protection between the pallet 100 and the battery cell 110.

[0049] Optionally, the operating temperature of the first insulating layer 121 is greater than 250°C, and the operating temperature of the second insulating layer 122 is 100°C to 250°C. The operating temperature is the highest temperature that can insulate and protect the electrolyte. For example, the operating temperature of the first insulating layer 121 is 251°C, which means that the first insulating layer 121 can contact the electrolyte with a temperature of 251°C and has an insulating and protective effect on the electrolyte. The first insulating layer 121 can be made of PI (polyimide) material, or PAI (imide), PBI (polybenzimidazole) and other materials. The second insulating layer 122 can be made of PET (polyethylene terephthalate), PC (polycarbonate), PP (polypropylene), PVDF (polyvinylidene fluoride) and other materials. Therefore, the cost of the first insulating layer 121 is higher than that of the second insulating layer 122. The composite insulating component 120 adopts a combination of the first insulating layer 121 and the second insulating layer 122, which can significantly reduce the cost compared to the method of using the entire first insulating layer 121, and has better high-temperature insulation performance than the method of using the entire second insulating layer 122.

[0050] Reference Figure 1 The first insulating layer 121 extends along the third direction D3, and the composite insulating assembly 120 includes four first insulating layers 121, which are arranged at intervals along the first direction D1, so that the projection of each battery cell 110 along the depth direction of the support plate 100 is correspondingly located within the range of the first insulating layer 121, so that the end 111 of each battery cell 110 has the insulation protection of the high-temperature resistant first insulating layer 121.

[0051] Optionally, refer to Figure 1 and Figure 2, a dimension L1 of the first insulating layer 121 along the first direction D1 is 40 mm to 80 mm. In other words, a width of the first insulating layer 121 is 40 mm to 80 mm, so that the first insulating layer 121 has a sufficient dimension along the first direction D1, thereby ensuring that the temperature generated at the end 111 of the battery cell 110 is reduced to a level that the second insulating layer 122 can withstand when it is conducted to the second insulating layer 122 along the first direction D1.

[0052] Similarly, along the first direction D1, the dimension L2 of the first insulating layer 121 protruding from the battery cell 110 is 20 mm to 40 mm, so that the temperature generated by the end 111 of the battery cell 110 is reduced to a level that the second insulating layer 122 can withstand when it is conducted along the first direction D1 to other parts of the support plate 100. In the first direction D1, the dimension L3 of the overlap between the first insulating layer 121 and the battery cell 110 is 20 mm to 40 mm, so that the temperature generated by the end 111 of the battery cell 110 is reduced to a level that the second insulating layer 122 can withstand when it is conducted along the first direction D1 to other parts of the battery cell 110.

[0053] Further, see Figure 2 The battery cell 110 is provided with an end surface 112, and along the first direction D1, the end surface 112 is located in the middle of the first insulating layer 121, so that the temperature conducted from the end 111 of the battery cell 110 along the first direction D1 toward both sides of the end surface 112 is sufficiently reduced to a level that the second insulating layer 122 can withstand.

[0054] Preferably, the dimension L1 of the first insulating layer 121 along the first direction D1 is 40 mm, and along the first direction D1, the end face 112 of the battery cell 110 is located in the middle of the first insulating layer 121, so that the composite insulating assembly 120 can meet the high temperature insulation performance of the battery pack while greatly reducing the use of the first insulating layer 121 and reducing the manufacturing cost of the battery pack.

[0055] As a preferred solution, the battery pack according to the utility model further includes a cover (not shown in the figure), which is fixedly mounted with the frame and covers the battery cell 110, and is used to encapsulate the battery cell 110. There are two composite insulating components 120, and another composite insulating component 120 is arranged between the battery cell 110 and the cover. The first insulating layer 121 and the second insulating layer 122 in the two composite insulating components 120 are respectively arranged correspondingly, so as to insulate and protect the battery cell 110 at the top of the battery cell 110.

[0056] The composite insulating component 120 is attached to the inner surface of the cover, thereby cooperating with the composite insulating component 120 in the support plate 100 to ensure the insulation performance of the battery pack.

[0057] The utility model also provides an electrical device, comprising the battery pack according to the above. The electrical device according to the utility model has the effect of good insulation performance and low manufacturing cost.

[0058] The electric equipment according to the present invention includes equipment using a battery pack, such as a vehicle or industrial equipment.

[0059] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art in the technical field of the present invention. The terms used herein are only for describing specific implementation purposes and are not intended to limit the present invention. Terms such as "setting" appearing in this article may indicate that one component is directly attached to another component, or that one component is attached to another component through an intermediate. Features described in this article in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable in the other embodiment or otherwise specified.

[0060] The utility model has been described through the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and description, and are not intended to limit the utility model to the described embodiments. It can be understood by those skilled in the art that more variations and modifications can be made according to the teachings of the utility model, and these variations and modifications all fall within the scope of the protection claimed by the utility model.

Claims

1. A battery pack, characterized in that: The battery pack comprises: Pallet; A battery cell, wherein the battery cell is disposed on the support plate and extends along a first direction; and A composite insulating component, the composite insulating component is arranged between the battery core and the support plate, the composite insulating component comprises at least a first insulating layer and a second insulating layer connected to each other, and the use temperature of the first insulating layer is greater than the use temperature of the second insulating layer; Along a second direction, an orthographic projection of the at least one first insulating layer corresponds to and overlaps with an orthographic projection of at least one end of the battery core, and the second direction is perpendicular to the first direction.

2. The battery pack according to claim 1, characterized in that: The second insulating layer is attached to the surface of the support plate, and the first insulating layer and the second insulating layer at least partially overlap.

3. The battery pack according to claim 1, characterized in that: Along the first direction, the first insulating layer protrudes from the battery core by 20 mm to 40 mm.

4. The battery pack according to claim 1, characterized in that: Along the first direction, the overlapped dimension between the first insulating layer and the battery core is 20 mm to 40 mm.

5. The battery pack according to claim 1, characterized in that: A dimension of the first insulating layer along the first direction is 40 mm to 80 mm.

6. The battery pack according to claim 1, characterized in that: Along the first direction, an overlapped dimension between the first insulating layer and the end of the battery cell is 2% to 6% of a length of the battery cell.

7. The battery pack according to claim 1, characterized in that: The battery core is provided with an end surface, and along the first direction, the end surface is located in the middle of the first insulating layer.

8. The battery pack according to any one of claims 1 to 7, characterized in that: The composite insulation assembly includes at least two first insulation layers, at least two first insulation layers are arranged along the first direction, at least part of the second insulation layer is arranged between at least two first insulation layers, and at least two first insulation layers are arranged corresponding to the ends of the battery cell.

9. The battery pack according to any one of claims 1 to 7, characterized in that: The battery pack also includes a cover body, which is arranged to cover the battery cell. The number of the composite insulating components is two, and another composite insulating component is arranged between the battery cell and the cover body. The first insulating layer and the second insulating layer in the two composite insulating components are arranged correspondingly.

10. The battery pack according to any one of claims 1 to 7, characterized in that: The first insulating layer is made of one of PI, PAI, and PBI materials, and / or The second insulating layer is one of PET, PC, PP and PVDF.

11. An electrical device, characterized in that: Comprising a battery pack according to any one of claims 1 to 10.

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