Battery pack and electric device

Abstract

The utility model provides a kind of battery pack and electric equipment, wherein battery pack, comprising: box;Heat exchange part is arranged in box;Battery is arranged in box;Buffer layer is arranged between battery and heat exchange part, buffer layer includes the first buffer section and the second buffer section of separate arrangement, battery has the state before deformation and the state after deformation, battery is in the state before deformation, first buffer section and second buffer section between there is first distance H1mm, battery is in the state after deformation, battery and buffer layer contact, first buffer section and second buffer section between there is second distance H2mm, wherein, second distance H2mm is less than first distance H1mm.The technical scheme of the application effectively solves the problem that the battery in related technology is prone to abnormal expansion after long time use.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a battery pack and electrical equipment. Background Technology

[0002] In the related technology, the battery is housed inside the casing, and the battery is arranged adjacent to the heat exchanger, which can dissipate heat from the battery.

[0003] However, after the battery is assembled with the heat exchanger, the battery has little room for expansion, and there is a risk that the battery may expand abnormally after long-term use. Utility Model Content

[0004] The main purpose of this utility model is to provide a battery pack and electrical equipment to solve the problem of the risk of abnormal expansion and opening of batteries after long-term use in related technologies.

[0005] To achieve the above objectives, according to one aspect of the present invention, a battery pack is provided, comprising: a housing; a heat exchanger disposed within the housing; a battery disposed within the housing; and a buffer layer disposed between the battery and the heat exchanger. The buffer layer includes a first buffer segment and a second buffer segment separated from each other. The battery has a state before deformation and a state after deformation. In the state before deformation, there is a first distance H1mm between the first buffer segment and the second buffer segment. In the state after deformation, the battery is in contact with the buffer layer, and there is a second distance H2mm between the first buffer segment and the second buffer segment. The second distance H2mm is less than the first distance H1mm.

[0006] According to another aspect of the present invention, an electrical device is provided, including a battery pack, wherein the battery pack is the aforementioned battery pack.

[0007] The battery pack, using the technical solution of this utility model, includes: a housing, a heat exchanger, a battery, and a buffer layer. The heat exchanger is disposed within the housing. The battery is disposed within the housing. The buffer layer is disposed between the battery and the heat exchanger, and includes a first buffer section and a second buffer section separated by a partition. The battery has a pre-deformation state and a post-deformation state. In the pre-deformation state, there is a first distance H1mm between the first and second buffer sections. In the post-deformation state, the battery is in contact with the buffer layer, and there is a second distance H2mm between the first and second buffer sections, wherein the second distance H2mm is smaller than the first distance H1mm. During the process of the battery changing from the pre-deformation state to the post-deformation state, the buffer layer thins as the battery deforms and expands. When the battery is in the post-deformation state, the aforementioned setting of the second distance H2mm being smaller than the first distance H1mm provides expansion space for the battery, increases the internal gas storage space of the battery, and reduces the risk of abnormal battery expansion. Therefore, the technical solution of this application effectively solves the problem of the risk of abnormal battery expansion after prolonged use in related technologies. Attached Figure Description

[0008] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0009] Figure 1 A top view schematic diagram of a first embodiment of the battery pack according to the present invention is shown;

[0010] Figure 2 It shows Figure 1 A longitudinal sectional view of the battery pack;

[0011] Figure 3 It shows Figure 2 An enlarged view of point A on the battery pack;

[0012] Figure 4 It shows Figure 1 A structural diagram of the battery pack before deformation;

[0013] Figure 5 It shows Figure 1 A structural diagram of the battery pack when the batteries are in a deformed state;

[0014] Figure 6 It shows Figure 1 A simplified lateral structural diagram of the battery pack and its buffer layer;

[0015] Figure 7 A simplified lateral structural diagram of the battery and its buffer layer according to Embodiment 2 of the battery pack of the present invention is shown.

[0016] The above figures include the following reference numerals:

[0017] 10. Box body;

[0018] 20. Heat exchanger components;

[0019] 30. Battery;

[0020] 40. Buffer layer; 41. First buffer section; 42. Second buffer section; 43. First contact surface; 44. Second contact surface; 45. Third contact surface; 46. Fourth contact surface; 47. Buffer frame. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0022] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0023] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0024] According to one aspect of this application, a battery pack is provided, such as Figures 1 to 5 As shown, Embodiment 1 of the battery pack includes: a housing 10, a heat exchanger 20, a battery 30, and a buffer layer 40. The heat exchanger 20 is disposed inside the housing 10. The battery 30 is disposed inside the housing 10. The buffer layer 40 is disposed between the battery 30 and the heat exchanger 20. The buffer layer 40 includes a first buffer section 41 and a second buffer section 42 that are separated from each other. The battery 30 has a state before deformation and a state after deformation. In the state before deformation, there is a first distance H1mm between the first buffer section 41 and the second buffer section 42. In the state after deformation, the battery 30 is in contact with the buffer layer 40, and there is a second distance H2mm between the first buffer section 41 and the second buffer section 42. The second distance H2mm is smaller than the first distance H1mm.

[0025] In the first embodiment of the battery pack, as the battery 30 expands (deforms) from its pre-deformation state to its post-deformation state, the buffer layer 40 thins. The aforementioned setting of the second distance H2mm being smaller than the first distance H1mm provides expansion space for the battery 30, increasing the internal gas storage space and reducing the risk of abnormal expansion. Therefore, the first embodiment of the battery pack effectively solves the problem of the risk of abnormal expansion after prolonged use in related technologies.

[0026] In the first embodiment of the battery pack, the state of the battery 30 before deformation refers to the state of the battery 30 before it expands, and the state of the battery 30 after deformation refers to the state of the battery 30 after it expands.

[0027] The heat exchanger preferably includes a liquid cooling plate or a multi-functional elastic sandwich liquid cooling plate. Both the liquid cooling plate and the multi-functional elastic sandwich liquid cooling plate include harmonica tubes made of aluminum alloy. This liquid cooling plate has excellent extrusion processing performance and high elongation, allowing it to adapt to the expansion and contraction of the battery cell. Multiple harmonica tubes are included. The heat exchange plate also includes current collectors. The current collectors and harmonica tubes are interconnected. Coolant flows from one current collector into the harmonica tube, flows through multiple harmonica tubes, and then flows out from another current collector, achieving heat exchange and cooling and absorbing heat from the battery cell.

[0028] like Figures 3 to 5As shown, the first buffer segment 41 corresponds to the position of maximum deformation of the battery 30. Before deformation, the thickness of the first buffer segment 41 is uniform throughout the battery 30. After deformation, the thickness of the first buffer segment 41 is minimized at the position of maximum deformation. The position of maximum deformation is typically where energy conversion is most intense. By placing the first buffer segment 41 at the position of maximum deformation of the battery 30, it ensures that the expansion of the battery 30 at this position can be effectively absorbed, avoiding excessive pressure on the cold plate during maximum expansion, thereby reducing the risk of abnormal expansion of the battery 30.

[0029] like Figures 3 to 5 As shown, in the state before deformation, the thickness of the second buffer section 42 is uniform throughout. In the state after deformation, the thickness of the second buffer section 42 is smallest at the part closest to the maximum deformation position of the battery 30. When the battery 30 expands, not all positions change at the same rate. The second buffer section 42 can better adapt to the expansion of the battery 30, providing deformation space, which helps to match the actual expansion of the battery 30 and enhances the stability of the overall battery pack.

[0030] like Figures 3 to 5 As shown, the first distance H1mm satisfies: H1mm ≥ 1mm. Limiting the first distance H1mm to a range of ≥ 1mm ensures that the buffer layer 40 has sufficient thickness to maintain its shape and isolation performance when the battery 30 is in a deformed state, while also effectively compressing the buffer layer 40 after the battery 30 is deformed, allowing the buffer layer 40 to adapt to the deformation. If H1 is less than 1mm, the buffer layer 40 may already be compressed before the battery 30 expands, increasing the risk of abnormal expansion of the battery 30.

[0031] The preferred first distance H1mm is 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, or 2.4m. m, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3. 7mm, 3.8mm, 3.9mm, 4.0mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5 .0mm, 5.1mm, 5.2mm, 5.3mm, 5.4mm, 5.5mm, 5.6mm, 5.7mm, 5.8mm, 5.9mm, 6.0mm, 6.1mm, 6.2mm , 6.3mm, 6.4mm, 6.5mm, 6.6mm, 6.7mm, 6.8mm, 6.9mm, 7.0mm, 7.1mm, 7.2mm, 7.3mm, 7.4mm, 7.5m m, 7.6mm, 7.7mm, 7.8mm, 7.9mm, 8.0mm, 8.1mm, 8.2mm, 8.3mm, 8.4mm, 8.5mm, 8.6mm, 8.7mm, 8.8 mm, 8.9mm, 9.0mm, 9.1mm, 9.2mm, 9.3mm, 9.4mm, 9.5mm, 9.6mm, 9.7mm, 9.8mm, 9.9mm or 10.0mm.

[0032] like Figures 3 to 5 As shown, the ratio of the first distance H1mm to the thickness T1mm of the first buffer section 41 satisfies: 0.1≤H1 / T1≤1. Limiting the range of H1 / T1 ensures that the first buffer section 41 can provide sufficient thermal conduction (or insulation) before the battery 30 expands, and that its thickness reduction is not too severe after the battery 30 expands, still maintaining basic heat dissipation and buffering functions.

[0033] The ratio of the first distance H1mm to the thickness T1mm of the first buffer section 41 is preferably 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 or 1.0.

[0034] like Figures 3 to 5As shown, the battery 30 is in its pre-deformation state, and the thickness T1mm of the first buffer segment 41 satisfies: 0.2mm ≤ T1mm ≤ 3mm. Setting the range of the thickness T1mm of the first buffer segment 41 ensures that before the battery 30 expands, the first buffer segment 41 can provide sufficient thermal conductivity (or insulation), and after the battery 30 expands, its thickness reduction will not be too severe, still maintaining basic heat dissipation and buffering functions. The thickness T1mm of the first buffer segment 41 refers to its dimension in the width direction X of the battery 30.

[0035] The thickness T1mm of the first buffer section 41 is preferably 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, or 3.0mm.

[0036] like Figures 3 to 5 As shown, the second distance H2mm satisfies: 0mm < H2mm ≤ 10mm. This ensures that the buffer layer 40 has sufficient thickness to maintain its shape and isolation performance when the battery 30 is in the pre-deformation state, and can effectively compress the buffer layer 40 when the battery 30 is in the deformed state, so that the buffer layer 40 can adapt to the deformation.

[0037] The second distance H2mm is preferably 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, or 2.4m. m, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3. 7mm, 3.8mm, 3.9mm, 4.0mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5 .0mm, 5.1mm, 5.2mm, 5.3mm, 5.4mm, 5.5mm, 5.6mm, 5.7mm, 5.8mm, 5.9mm, 6.0mm, 6.1mm, 6.2mm , 6.3mm, 6.4mm, 6.5mm, 6.6mm, 6.7mm, 6.8mm, 6.9mm, 7.0mm, 7.1mm, 7.2mm, 7.3mm, 7.4mm, 7.5m m, 7.6mm, 7.7mm, 7.8mm, 7.9mm, 8.0mm, 8.1mm, 8.2mm, 8.3mm, 8.4mm, 8.5mm, 8.6mm, 8.7mm, 8.8 mm, 8.9mm, 9.0mm, 9.1mm, 9.2mm, 9.3mm, 9.4mm, 9.5mm, 9.6mm, 9.7mm, 9.8mm, 9.9mm or 10.0mm.

[0038] like Figures 3 to 5 As shown, the battery 30 is in its pre-deformation state. In the height direction Z of the battery 30, the height W1mm of the first buffer segment 41 satisfies: 5mm≤W1mm≤20mm. The set range of the height W1mm of the first buffer segment 41 optimizes the contact area with the battery 30, so that when the battery 30 expands, the width can be changed to adapt to the expansion shape of the battery 30.

[0039] The height W1mm of the first buffer section 41 is preferably 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm or 20mm.

[0040] like Figures 3 to 5As shown, the battery 30 is in its pre-deformation state. In the height direction Z of the battery 30, the height W2mm of the second buffer segment 42 is greater than or equal to the height W1mm of the first buffer segment 41. The aforementioned size limitation of W2mm>W1mm optimizes the contact area with the battery 30, allowing the height to adapt to the expansion shape of the battery 30 when it expands.

[0041] like Figures 3 to 5 As shown, the battery 30 is in its pre-deformation state. In the height direction Z of the battery 30, the ratio of the height W2mm of the second buffer section 42 to the height W1mm of the first buffer section 41 satisfies: 1≤W2 / W1≤3. The aforementioned W2 / W1 size limitation allows the height W2mm of the second buffer and the W1 of the first buffer section 41 to simultaneously accommodate different degrees of expansion of the battery 30.

[0042] The ratio of the height W2mm of the second buffer section 42 to the height W1mm of the first buffer section 41 is preferably 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9 or 3.0.

[0043] like Figures 3 to 6 As shown, the first buffer section 41 and the second buffer section 42 are spaced apart along the height direction Z of the battery 30, wherein there is an even number of second buffer sections 42, and the even number of second buffer sections 42 are located on both sides of the first buffer section 41. The spaced arrangement in the height direction Z further improves the expansion adaptability of the battery 30 in the height direction Z, making it easier to adapt to the increase in the gas storage space inside the battery 30.

[0044] In Embodiment 2 of the battery pack, the difference from Embodiment 1 lies in the arrangement of the first and second buffer sections. For example... Figure 7 As shown, the first buffer segment 41 and the second buffer segment 42 are spaced apart along the length Y direction of the battery 30, wherein there is an even number of second buffer segments 42, and the even number of second buffer segments 42 are located on both sides of the first buffer segment 41. By spaced apart along the length Y direction, the first buffer segment 41 and the second buffer segment 42 can form a more stable support, and at the same time enhance the expansion absorption capacity of the battery 30 in the length direction, making it easier to adapt to the increase in the gas storage space inside the battery 30.

[0045] like Figures 3 to 6As shown, the battery 30 is in contact with the buffer layer 40. Before deformation, the surface of the buffer layer 40 in contact with the battery 30 is the first contact surface 43. After deformation, the surface of the buffer layer 40 in contact with the battery 30 is the second contact surface 44, and the area of ​​the second contact surface 44 is larger than the area of ​​the first contact surface 43. As the battery 30 changes from its pre-deformation to post-deformation state, the increase in the area of ​​the second contact surface 44 relative to the area of ​​the first contact surface 43 means that the contact between the buffer layer 40 and the battery 30 is tighter, enabling it to more effectively accommodate the expansion of the battery 30 and providing a larger deformation space during expansion.

[0046] like Figures 3 to 6 As shown, the ratio of the area of ​​the first contact surface 43 to the area of ​​the second contact surface 44 is in the range of 20% to 80%. By controlling the range of the ratio of the area of ​​the first contact surface 43 to the area of ​​the second contact surface 44, the buffer layer 40 can be adapted to the buffer performance under different conditions, ensuring that it can provide better support under any circumstances, so as to effectively meet the requirements of the battery 30 for deformation space due to expansion.

[0047] The ratio of the area of ​​the first contact surface 43 to the area of ​​the second contact surface 44 is preferably 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, 50%, 52%, 54%, 56%, 58%, 60%, 62%, 64%, 66%, 68%, 70%, 72%, 74%, 76%, 78%, or 80%.

[0048] like Figures 3 to 6 As shown, the ratio of the area of ​​the first contact surface 43 to the area of ​​the side surface of the battery 30 is in the range of 30% to 80%. Limiting the range of the ratio of the first contact surface 43 to the side surface of the battery 30 helps to ensure that the buffer layer 40 can adapt to the deformation of the battery 30 and accommodate the increase in the gas storage space inside the battery 30, thereby improving the structural stability of the entire battery pack.

[0049] The ratio of the area of ​​the first contact surface 43 to the area of ​​the side surface of the battery 30 is preferably 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, 50%, 52%, 54%, 56%, 58%, 60%, 62%, 64%, 66%, 68%, 70%, 72%, 74%, 76%, 78%, or 80%.

[0050] like Figures 3 to 6As shown, the ratio of the area of ​​the second contact surface 44 to the area of ​​the side surface of the battery 30 is in the range of 50% to 100%. This ratio helps ensure that the buffer layer 40 can adapt to the deformation of the battery 30 and accommodate the increase in the gas storage space inside the battery 30, thereby improving the structural stability of the entire battery pack.

[0051] The ratio of the area of ​​the second contact surface 44 to the area of ​​the side surface of the battery 30 is preferably 50%, 52%, 54%, 56%, 58%, 60%, 62%, 64%, 66%, 68%, 70%, 72%, 74%, 76%, 78%, 80%, 82%, 84%, 86%, 88%, 90%, 92%, 94%, 96%, 98%, or 100%.

[0052] like Figures 3 to 6 As shown, the battery 30 is in contact with the heat exchanger 20. Before deformation, the surface of the buffer layer 40 in contact with the heat exchanger 20 is the third contact surface 45. After deformation, the surface of the buffer layer 40 in contact with the heat exchanger 20 is the fourth contact surface 46, and the area of ​​the fourth contact surface 46 is larger than the area of ​​the third contact surface 45. The increase in the area of ​​the fourth contact surface 46 compared to the area of ​​the third contact surface 45, from before to after deformation, means that the contact between the buffer layer 40 and the heat exchanger 20 is tighter, reducing the direct impact of the battery 30's expansion on the heat exchanger 20. This good contact between the buffer layer 40 and the heat exchanger 20 allows for timely response to changes in heat load caused by the battery 30's expansion, enabling the heat exchanger 20 to dissipate heat from the battery 30 while still providing a buffering effect.

[0053] like Figures 3 to 6 As shown, the ratio of the area of ​​the third contact surface 45 to the area of ​​the fourth contact surface 46 is in the range of 20% to 80%. By controlling the range of the ratio of the area of ​​the third contact surface 45 to the area of ​​the fourth contact surface 46, the stress generated by the expansion of the battery 30 can be absorbed to a greater extent without sacrificing heat transfer performance, thus preventing the risk of the battery 30 expanding open.

[0054] The ratio of the area of ​​the third contact surface 45 to the area of ​​the fourth contact surface 46 is preferably 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, 50%, 52%, 54%, 56%, 58%, 60%, 62%, 64%, 66%, 68%, 70%, 72%, 74%, 76%, 78%, or 80%.

[0055] like Figures 3 to 6As shown, the buffer layer 40 also includes a buffer frame 47, within which the first buffer segment 41 and the second buffer segment 42 are both located. The introduction of the buffer frame 47 not only increases the structural integrity but also ensures the positional and shape stability of the first buffer segment 41 and the second buffer segment 42 as the battery 30 expands.

[0056] like Figures 3 to 6 As shown, the battery 30 is in its pre-deformation state. In the height direction Z of the battery 30, the height W3mm of the buffer frame 47 satisfies: 2mm≤W3mm≤20mm. The setting range of the height W3mm of the buffer frame 47 optimizes the overall dimensions of the buffer layer 40, ensuring that the buffer frame 47 can provide sufficient support when the battery 30 expands, thus providing a buffering effect while facilitating adaptation to the expansion and deformation of the battery 30.

[0057] The height W3mm of the buffer frame 47 is preferably 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm or 20mm.

[0058] like Figures 3 to 6 As shown, the battery 30 is in contact with the buffer layer 40, and the battery 30 is in its pre-deformation state. There is a third distance H3mm between the end face of the first buffer segment 41 and the buffer frame 47, and a fourth distance H4mm between the side of the first buffer segment 41 closest to the buffer frame 47 and the buffer frame 47. The third distance H3mm satisfies: 0mm ≤ H3mm ≤ 10mm, and / or the fourth distance H4mm satisfies: 0mm ≤ H4mm ≤ 10mm. Defining the range of the third distance H3mm and / or the fourth distance H4mm between the first buffer segment 41 and the buffer frame 47 helps ensure that the first buffer segment 41 can be sufficiently compressed when the battery 30 expands, while also preventing material failure due to over-compression.

[0059] The third distance H3mm and / or the fourth distance H4mm are preferably 0mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm.

[0060] like Figures 3 to 6As shown, the battery 30 is in contact with the buffer layer 40, and the battery 30 is in its pre-deformation state. There is a fifth distance H5mm between the end face of the second buffer segment 42 and the buffer frame 47, and a sixth distance H6mm between the side of the second buffer segment 42 closest to the buffer frame 47 and the buffer frame 47. The fifth distance H5mm satisfies: 0mm ≤ H5mm ≤ 10mm, and / or the sixth distance H6mm satisfies: 0mm ≤ H6mm ≤ 10mm. Limiting the range of the fifth distance H5mm and the sixth distance H6mm between the second buffer segment 42 and the buffer frame 47 helps ensure that the second buffer segment 42 can be sufficiently compressed when the battery 30 expands, while also preventing material failure due to over-compression.

[0061] The fifth distance H5mm and / or the sixth distance H6mm are preferably 0mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm.

[0062] In this application, the enclosure refers to a closed or semi-closed structure made of materials such as metal and plastic, which serves as the physical carrier of the battery pack. Its design and manufacturing must meet the safety, reliability, and functionality requirements of the battery pack under different usage scenarios. The enclosure provides installation space for the battery pack, BMS, cooling system, electrical connection components, etc., and through reasonable structural design, fixes these components inside the enclosure to ensure that they maintain a relatively stable position during battery pack operation, avoiding damage to components or loosening of connections due to vibration, impact, or other factors.

[0063] The enclosure can be cast from materials such as steel plates and aluminum alloys, or lightweight materials such as glass fiber reinforced composites and carbon fiber reinforced composites. The shape of the enclosure can be cylindrical, cuboid, cube, etc.

[0064] The aforementioned battery pack includes a battery pack composed of multiple batteries connected in series and / or in parallel to form a battery management system (BMS), a thermal management system, an electrical connection system (high-voltage / low-voltage connectors, wiring harnesses, etc.), structural components (casing, brackets, etc.), and protective components. All of these components are placed inside a housing and sealed with a cover plate to form a complete functional unit that can directly output electrical energy.

[0065] The aforementioned batteries can be secondary or primary batteries, and can also be lithium-ion batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, or magnesium-ion batteries, etc., but this embodiment of the invention is not limited to these. Batteries can be cylindrical, flat, cuboid, or other shapes, but this embodiment of the invention is not limited to these shapes either. Batteries are generally classified into three types according to their packaging method: cylindrical batteries, square batteries, and pouch batteries, but this embodiment of the invention is not limited to these types either.

[0066] For example, a battery may include a casing, a cell, and an electrolyte, with the casing housing the cell and electrolyte. The cell also includes a separator. Batteries primarily function by the movement of metal ions between the positive and negative electrodes.

[0067] The battery cell may have terminals or other components connected to adapters, with the terminals serving as the electrical connection points. Furthermore, the battery cell typically includes a pressure relief section. In the event of excessive internal pressure (e.g., thermal runaway), this section releases substances (e.g., gases, liquids, particulate matter) from the cell's interior, reducing internal pressure and preventing rapid pressurization that could lead to dangerous accidents such as cell explosions. For example, the pressure relief section can be an explosion-proof valve or explosion-proof plate. The adapter is preferably a connecting plate, and preferably a conductive structure. Any adjacent positive and negative electrodes are separated by a diaphragm.

[0068] The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector without the positive active material layer protrudes from the positive current collector with the positive active material layer. The positive current collector without the positive active material layer serves as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.

[0069] The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The negative current collector without the negative active material layer protrudes from the negative current collector with the negative active material layer. The negative current collector without the negative active material layer serves as the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. To ensure that a large current can be passed without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together.

[0070] The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure. A wound cell is generally manufactured by winding continuous positive and negative electrodes and a separator, with the separator located between adjacent positive and negative electrodes. A stacked cell is manufactured by stacking positive and negative electrodes and a separator, where the positive and negative electrodes are separated by a separator, and adjacent layers of positive and / or negative electrodes within the cell are discontinuous. The stacking process includes layering or Z-shaped folding, etc. The embodiments of this application are not limited to these.

[0071] According to another aspect of this application, an electrical device is provided, including a battery pack capable of providing electrical energy to the device. The battery pack is the one described above. Because the aforementioned battery pack can solve the problem of the risk of abnormal expansion of batteries after prolonged use in related technologies, the electrical device including this battery pack can solve the same technical problem.

[0072] The electrical equipment disclosed in this utility model embodiment can be, but is not limited to, vehicles, mobile phones, tablets, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be fuel-powered vehicles, natural gas vehicles, new energy vehicles, or rail vehicles; new energy vehicles can be pure electric vehicles, hybrid vehicles, or range-extended vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. When the electrical equipment is a vehicle, the battery pack can be located at the bottom, front, or rear of the vehicle.

[0073] In the description of this utility model, it should be understood that "multiple" means a quantity of two or more. Directional terms such as "front, back, up, down, left, right," "horizontal, vertical, perpendicular, horizontal," and "top, bottom" indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are used solely for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner or outer contours relative to the outline of each component itself.

[0074] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0075] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0076] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery pack, characterized in that, include: Box (10); A heat exchanger (20) is disposed inside the housing (10); A battery (30) is disposed inside the housing (10); A buffer layer (40) is disposed between the battery (30) and the heat exchanger (20). The buffer layer (40) includes a first buffer section (41) and a second buffer section (42) that are separated from each other. The battery (30) has a state before deformation and a state after deformation. The battery (30) is in the state before deformation. There is a first distance H1mm between the first buffer section (41) and the second buffer section (42). The battery (30) is in the state after deformation. The battery (30) is in contact with the buffer layer (40). There is a second distance H2mm between the first buffer section (41) and the second buffer section (42). The second distance H2mm is smaller than the first distance H1mm.

2. The battery pack according to claim 1, characterized in that, The first buffer segment (41) corresponds to the position of maximum deformation of the battery (30). The battery (30) is in the state before deformation. The thickness of the first buffer segment (41) is equal everywhere. The battery (30) is in the state after deformation. The thickness of the first buffer segment (41) corresponding to the position of maximum deformation of the battery (30) is the smallest.

3. The battery pack according to claim 1, characterized in that, When the battery (30) is in the state before deformation, the thickness of the second buffer section (42) is equal everywhere. When the battery (30) is in the state after deformation, the thickness of the part of the second buffer section (42) closest to the maximum deformation position of the battery (30) is the smallest.

4. The battery pack according to claim 1, characterized in that, The first distance H1mm satisfies: H1mm≥1mm.

5. The battery pack according to claim 4, characterized in that, The ratio of the first distance H1mm to the thickness T1mm of the first buffer section (41) satisfies: 0.1≤H1 / T1≤1.

6. The battery pack according to claim 5, characterized in that, The battery (30) is in the state before the deformation, and the thickness T1mm of the first buffer section (41) satisfies: 0.2mm≤T1mm≤3mm.

7. The battery pack according to claim 1, characterized in that, The second distance H2mm satisfies: 0mm<H2mm≤10mm.

8. The battery pack according to claim 1, characterized in that, The battery (30) is in the state before the deformation. In the height direction (Z) of the battery (30), the height W1mm of the first buffer segment (41) satisfies: 5mm≤W1mm≤20mm.

9. The battery pack according to claim 8, characterized in that, The battery (30) is in the state before the deformation. In the height direction (Z) of the battery (30), the height W2mm of the second buffer segment (42) is greater than or equal to the height W1mm of the first buffer segment (41).

10. The battery pack according to claim 9, characterized in that, The battery (30) is in the state before the deformation. In the height direction (Z) of the battery (30), the ratio of the height W2mm of the second buffer section (42) to the height W1mm of the first buffer section (41) satisfies: 1≤W2 / W1≤3.

11. The battery pack according to claim 1, characterized in that, The first buffer segment (41) and the second buffer segment (42) are spaced apart along the length direction (Y) of the battery (30), wherein there is an even number of second buffer segments (42), and the even number of second buffer segments (42) are located on both sides of the first buffer segment (41).

12. The battery pack according to claim 1, characterized in that, The first buffer segment (41) and the second buffer segment (42) are spaced apart along the height direction (Z) of the battery (30), wherein there is an even number of second buffer segments (42), and the even number of second buffer segments (42) are located on both sides of the first buffer segment (41).

13. The battery pack according to claim 1, characterized in that, The battery (30) is in contact with the buffer layer (40). The battery (30) is in the state before deformation. The surface of the buffer layer (40) in contact with the battery (30) is the first contact surface (43). The battery (30) is in the state after deformation. The surface of the buffer layer (40) in contact with the battery (30) is the second contact surface (44). The area of ​​the second contact surface (44) is larger than the area of ​​the first contact surface (43).

14. The battery pack according to claim 13, characterized in that, The ratio of the area of ​​the first contact surface (43) to the area of ​​the second contact surface (44) is in the range of 20% to 80%.

15. The battery pack according to claim 13, characterized in that, The ratio of the area of ​​the first contact surface (43) to the area of ​​the side surface of the battery (30) is in the range of 30% to 80%.

16. The battery pack according to claim 13, characterized in that, The ratio of the area of ​​the second contact surface (44) to the area of ​​the side surface of the battery (30) is in the range of 50% to 100%.

17. The battery pack according to claim 1, characterized in that, The battery (30) is in contact with the heat exchanger (20). The battery (30) is in the state before deformation. The surface of the buffer layer (40) in contact with the heat exchanger (20) is the third contact surface (45). The battery (30) is in the state after deformation. The surface of the buffer layer (40) in contact with the heat exchanger (20) is the fourth contact surface (46). The area of ​​the fourth contact surface (46) is greater than the area of ​​the third contact surface (45).

18. The battery pack according to claim 17, characterized in that, The ratio of the area of ​​the third contact surface (45) to the area of ​​the fourth contact surface (46) is in the range of 20% to 80%.

19. The battery pack according to claim 1, characterized in that, The buffer layer (40) further includes a buffer frame (47), in which the first buffer segment (41) and the second buffer segment (42) are both located.

20. The battery pack according to claim 19, characterized in that, The battery (30) is in the state before the deformation. In the height direction of the battery (30), the height W3mm of the buffer frame (47) satisfies: 2mm≤W3mm≤20mm.

21. The battery pack according to claim 19, characterized in that, The battery (30) is in contact with the buffer layer (40), the battery (30) is in the state before the deformation, the end face of the first buffer segment (41) has a third distance H3mm between it and the buffer frame (47), the side of the first buffer segment (41) closest to the buffer frame (47) has a fourth distance H4mm between it and the buffer frame (47), the third distance H3mm satisfies: 0mm≤H3mm≤10mm, and / or, the fourth distance H4mm satisfies: 0mm≤H4mm≤10mm.

22. The battery pack according to claim 19, characterized in that, The battery (30) is in contact with the buffer layer (40), the battery (30) is in the state before the deformation, the end face of the second buffer segment (42) has a fifth distance H5mm between it and the buffer frame (47), the side of the second buffer segment (42) closest to the buffer frame (47) has a sixth distance H6mm between it and the buffer frame (47), the fifth distance H5mm satisfies: 0mm≤H5mm≤10mm, and / or, the sixth distance H6mm satisfies: 0mm≤H6mm≤10mm.

23. An electrical device, comprising a battery pack, characterized in that, The battery pack is the battery pack according to any one of claims 1 to 22.

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