Battery packs and electrical devices that have them

Abstract

This utility model relates to the field of battery technology, providing a battery pack and an electrical device having the same. The battery pack includes a housing, multiple batteries, multiple buffer frames, and an adhesive. The housing includes a bottom plate and side plates, which enclose a receiving space. Multiple batteries are stacked along their thickness direction and housed within the receiving space. A buffer frame is provided between two adjacent batteries, each buffer frame comprising two frames with a gap between them. The adhesive bonds the multiple batteries to the bottom plate. The depth of the gap is a1 (mm), the width of the gap is a2 (mm), and the viscosity of the adhesive is η (mm² / s), where 5000 ≤ η / a m ≤250000, a m It is the smaller of a1 and a2. By increasing the surface tension that the adhesive overflows through the gap, the probability of it contacting the battery surface inside the buffer frame is reduced.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular, to a battery pack and an electrical device having the same. Background Technology

[0002] With the booming development of new energy vehicles and the energy storage industry, batteries are widely used in various power and energy storage scenarios due to their advantages such as high energy density and long cycle life. In the battery assembly process, batteries are usually stacked into groups and secured with fixing straps along the outer perimeter. A liquid adhesive is coated on the bottom plate of the housing to bond the batteries placed inside the housing.

[0003] The relevant technology incorporates a buffer frame between adjacent batteries. When the batteries are tightened by the fixing straps, the buffer frame deforms under pressure, storing a certain amount of elastic potential energy. When the external force is released, the elastic potential energy is released, and the buffer frame can generate a pre-tightening force on the adjacent batteries, enhancing resistance to displacement caused by adverse conditions such as vibration and impact. When the battery expands in volume during charging and discharging, it will deform towards the space enclosed by the surfaces of the buffer frame and adjacent batteries.

[0004] However, buffer frames are typically constructed from several buffer strips joined together, with gaps existing at the joints between these strips. During battery pack installation, the adhesive on the base plate can easily overflow along these gaps onto the battery surface. Once the adhesive cures, it forms a hard coating on the battery surface. When the battery expands in volume during charging and discharging, the adhesive restricts its free deformation, leading to stress concentration on the battery's primary surface. This exacerbates the risk of lithium plating, posing a potential threat to the battery's safety performance. Utility Model Content

[0005] In view of this, the present invention provides a battery pack and an electrical device having the same, aiming to solve the problem of the adhesive restricting the free deformation of the battery when it expands.

[0006] In a first aspect, the battery pack provided in this embodiment of the present invention includes a housing, multiple batteries, multiple buffer frames, and an adhesive. The housing includes a bottom plate and side plates, which form a receiving space. Multiple batteries are stacked along the thickness direction and received within the receiving space. A buffer frame is provided between two adjacent batteries, and the buffer frame includes two frame bodies with a gap between them. The adhesive bonds the multiple batteries to the bottom plate. The depth of the gap is a1 (mm), the width of the gap is a2 (mm), and the viscosity of the adhesive is η (mm² / s), where 5000 ≤ η / a m ≤250000, where a m It is the smaller of a1 and a2.

[0007] Secondly, the electrical equipment provided in this embodiment of the present invention includes a battery pack as described in the first aspect.

[0008] The beneficial effects of the battery pack provided in the above embodiments of this utility model are as follows: By reducing the depth or width of the gap and increasing the viscosity of the adhesive, the surface tension that the adhesive needs to overcome to overflow through the gap can be increased, thereby reducing the probability that the adhesive will contact the battery surface inside the buffer frame through the gap. In this way, when the battery expands in volume during charging and discharging, it can deform towards the space enclosed by the surfaces of the two adjacent batteries and the buffer frame, releasing mechanical stress. This deformation process is not constrained by the cured adhesive, thus avoiding stress concentration in the battery, reducing the risk of lithium plating, and ensuring battery safety. Furthermore, the battery pack provided by this invention can also meet the precision requirements during buffer frame installation and the pre-tightening force provided by the buffer frame to the two adjacent batteries, ensuring installation efficiency and structural reliability. Attached Figure Description

[0009] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below.

[0010] It should be understood that the following figures only show some embodiments of the present invention and should not be regarded as a limitation on the scope.

[0011] It should also be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0012] It should also be understood that the accompanying drawings are only schematic, and the dimensions and scales of the elements in the drawings are not necessarily precise.

[0013] Figure 1 This is a schematic diagram of the structure of a battery pack according to an embodiment of the present invention.

[0014] Figure 2 yes Figure 1 An exploded view of the battery pack.

[0015] Figure 3 yes Figure 2 A schematic diagram of the battery structure in the battery pack.

[0016] Figure 4 yes Figure 2 A schematic diagram of a portion of the battery pack.

[0017] Figure 5 yes Figure 4 An enlarged view of a portion of the battery pack.

[0018] Figure 6 yes Figure 2 A side view of a portion of the battery pack.

[0019] Figure 7 This is a structural schematic diagram of a portion of a battery pack according to a first modification of the present invention.

[0020] Figure 8 This is a schematic diagram of a portion of a battery pack according to a second modification of the present invention.

[0021] Figure 9 This is a schematic diagram of a portion of a battery pack according to a third modification of the present invention.

[0022] Figure 10 This is a structural schematic diagram of an electrical device according to an embodiment of the present utility model.

[0023] Explanation of reference numerals in the attached drawings: Battery pack - 100; Box body - 10; Bottom plate - 11; Side plate - 12; Storage space - 13; Battery - 20; Buffer frame - 30; Frame body - 31; Top frame body - 311; Bottom frame body - 312; Side frame body - 313; Gap - 32; First gap 321; Second gap 322; Third gap 323; Fourth gap 324; Adhesive body - 40; Frame body - 31a; First frame body - 33; Top frame part - 331; First side frame part - 332; Second frame body - 34; Bottom frame part - 341; Second side frame part - 342; Electrical equipment - 200. Detailed Implementation

[0024] The embodiments of the present invention will now be described by way of example with reference to the accompanying drawings. It should be understood that there are many ways to implement the present invention, and it should not be construed as being limited to the embodiments described herein. The embodiments described herein are only for a more thorough and clear understanding of the present invention.

[0025] <Example Battery> Figure 3 A battery 20 is shown, which can store chemical energy and controllably convert chemical energy into electrical energy. In the recyclable battery 20, the active materials can be activated by charging after discharge so that it can continue to be used.

[0026] It is understood that in this embodiment of the present invention, battery 20 refers to an energy storage device that can be repeatedly charged and discharged. Battery 20 can be lithium-ion battery 20, sodium-ion battery 20, nickel-metal hydride battery 20, etc.

[0027] refer to Figure 3 The battery 20 includes a casing 21 and a cell 22.

[0028] The housing 21 provides a receiving space to house the battery cell 22 and isolate it from the outside environment. The housing 21 includes a body with an opening at at least one end and a receiving cavity. The opening of the housing 21 can be closed by a cover plate, sealing and isolating the internal environment of the battery 20 from the external environment. Exemplarily, the material of the housing 21 can be one of copper, iron, aluminum, stainless steel, aluminum alloy, plastic, and aluminum-plastic film; this invention does not impose any particular limitation on this.

[0029] Cell 22 is the component in battery 20 where electrochemical reactions occur, and it is also the smallest unit in battery 20 capable of electrochemical reactions such as charging or discharging. Cell 22 typically includes a positive electrode, a negative electrode, and a separator. As an example, cell 22 can be a lithium-ion cell 22, which operates by the intercalation and deintercalation of lithium ions between the positive and negative electrodes.

[0030] It is understood that the battery cell 22 can be implemented in various ways. For example, the battery cell can be a cylindrical battery cell formed by winding a positive electrode, a separator, and a negative electrode. Alternatively, the battery cell can be a battery cell with a generally cuboid shape formed by winding or stacking a positive electrode, a separator, and a negative electrode. In the current embodiment, the battery cell 22 is cuboid in shape, and the housing 21 is a rigid cuboid-shaped shell to accommodate the battery cell 22.

[0031] Continue to refer to Figure 3 The battery 20 has two parallel first surfaces 23 in the thickness direction. The first surface 23 is the largest of the six outer surfaces of the battery 20. For the wound or stacked cell 22, the first surface 23 faces the largest plane of the internal positive electrode, separator and negative electrode. Therefore, the expansion and contraction of the battery 20 during charging and discharging are mainly manifested as the deformation of the first surface 23 in the thickness direction.

[0032] It should be noted that in the accompanying drawings of this utility model, arrows Z+ and Z- are used to indicate opposite sides in the height direction; arrows X+ and X- are used to indicate opposite sides in the thickness direction; and arrows Y+ and Y- are used to indicate opposite sides in the length direction.

[0033] <Example Battery Pack> refer to Figure 1 and Figure 2 The battery pack 100 provided in this embodiment of the present invention includes a housing 10, a plurality of batteries 20, and an adhesive 40. The housing 10 includes a bottom plate 11 and a side plate 12, which together form a receiving space 13. The plurality of batteries 20 are stacked along the thickness direction and received in the receiving space 13, and the bottom plate 11 supports the plurality of batteries 20. The adhesive 40 bonds the plurality of batteries 20 to the bottom plate 11.

[0034] Combination Figure 4 and Figure 5 The battery pack 100 provided in this embodiment includes a plurality of buffer frames 30. A buffer frame 30 is provided between two adjacent batteries 20, that is, a buffer frame 30 is provided between the first surfaces 23 of two batteries 20 facing each other in the thickness direction. The buffer frame 30 can apply a preload to the battery 20 so that it can resist displacement caused by vibration or impact.

[0035] It is understood that there are multiple ways to place the buffer frame 30 between two adjacent batteries 20, and this embodiment of the utility model does not impose any particular limitation on this. For example, the buffer frame 30 can be pasted between two adjacent batteries 20, or, for another example, a heat insulation pad can be provided between two adjacent batteries 20, and the buffer frame 30 is pasted to the heat insulation pad.

[0036] refer to Figures 4 to 6 The buffer frame 30 includes two frames 31, with a gap 32 formed between them. The depth of the gap 32 is a1 (mm), and the width of the gap 32 is a2 (mm). The viscosity of the adhesive 40 is η (mm² / s), and 5000 ≤ η / a m ≤250000, where a m It is the smaller of a1 and a2. For example, η / a m The values ​​can be 5000, 8000, 15000, 22000, 28000, 35000, 42000, 50000, 58000, 65000, 72000, 80000, 90000, 100000, 120000, 135000, 150000, 180000, 200000, 230000, or 250000.

[0037] If the ratio of the viscosity of the adhesive 40 to the smaller of the depth and width of the gap 32 is too small (i.e., less than 5000), the adhesive 40 will have low viscosity and good fluidity, easily overflowing through the gap 32 to the first surface 23 inside the buffer frame 30. After the adhesive 40 cures, a hard coating layer will form on the first surface 23 of the battery 20. When the battery 20 expands in volume during charging and discharging, the adhesive 40 will restrict its free deformation, causing stress concentration on the first surface 23 of the battery 20.

[0038] If the ratio of the viscosity of the adhesive 40 to the smaller of the depth and width of the gap 32 is too large (i.e., greater than 250,000), then the depth or width of the gap 32 will be too small. If the depth of the gap 32 is too small, that is, the thickness of the buffer frame 30 is too small, this will reduce the preload provided by the buffer frame 30 to the two adjacent batteries 20, making the batteries 20 prone to displacement under adverse working conditions such as vibration and impact. If the width of the gap 32 is too small, it will increase the installation accuracy requirements of the buffer frame 30, prolong the operation time, and thus affect the installation efficiency.

[0039] According to the battery pack 100 provided in this embodiment of the present invention, the ratio of the viscosity of the adhesive 40 to the smaller of the depth and width of the gap 32 is limited to the aforementioned numerical range. By reducing the depth or width of the gap 32 and increasing the viscosity of the adhesive 40, the surface tension that the adhesive 40 needs to overcome to overflow through the gap 32 can be increased, thereby reducing the probability that the adhesive 40 will contact the first surface 23 inside the buffer frame 30 through the gap 32. In this way, when the battery 20 expands in volume during charging and discharging, it can deform towards the space enclosed by the two adjacent first surfaces 23 and the buffer frame 30, releasing mechanical stress. This deformation process is not constrained by the cured adhesive 40, thus avoiding stress concentration in the battery 20, thereby reducing the risk of lithium plating and ensuring the safety performance of the battery 20. In addition, the battery pack 100 provided in this embodiment of the present invention can also take into account the accuracy requirements during the installation of the buffer frame 30 and the pre-tightening force provided by the buffer frame 30 for the two adjacent batteries 20, ensuring installation efficiency and structural reliability.

[0040] It should be noted that in this invention, directional descriptions such as "inner" and "outer" are relative rather than absolute. These directional descriptions apply when the elements in this invention are in the placement posture and position shown in the figures. For example, the inner side of the buffer frame 30 refers to the side of the frame 31 closest to the space enclosed by the first surfaces 23 of the two adjacent batteries 20 and the buffer frame 30 on a plane perpendicular to the thickness direction. The outer side of the buffer frame 30 refers to the side of the frame 31 furthest from the space enclosed by the first surfaces 23 of the two adjacent batteries 20 and the buffer frame 30 on a plane perpendicular to the thickness direction.

[0041] refer to Figure 4 The buffer frame 30 includes a top frame 311, a bottom frame 312, and two side frames 313, all of which are strip-shaped and arranged in a rectangular configuration. Designing the buffer frame 30 as a strip structure helps reduce manufacturing difficulty and material waste during the molding process. Furthermore, the rectangular arrangement of the buffer frame 30 allows for sufficient deformation space to be reserved for the first surface 23 within its enclosed area.

[0042] Continue to refer to Figure 4 and Figure 5The gap 32 includes a first gap 321, which is formed between the bottom frame 312 and any one of the side frames 313. 25000≤η / a m ≤250000. For example, η / a m The values ​​can be 25000, 40000, 50000, 60000, 75000, 85000, 100000, 115000, 125000, 140000, 150000, 160000, 170000, 180000, 190000, 200000, 215000, 225000, 235000, 245000, or 250000.

[0043] If the ratio of the viscosity of the adhesive 40 to the smaller of the depth and width of the gap 32 is too small (i.e., less than 25000), the depth or width of the gap 32 will be large. The adhesive 40 will easily overflow through the gap 32 to the first surface 23 inside the buffer frame 30. After the adhesive 40 cures, it will form a hard coating layer. When the battery 20 expands in volume during charging and discharging, the adhesive 40 will restrict its free deformation, causing stress concentration in the battery 20.

[0044] If the ratio of the viscosity of the adhesive 40 to the smaller of the depth and width of the gap 32 is too large (i.e., greater than 250,000), then the width of the gap 32 will be too small, and the depth of the gap 32 will be too small, which means the thickness of the buffer frame 30 will be too small. This will reduce the preload provided by the buffer frame 30 to the two adjacent batteries 20, making the batteries 20 prone to displacement under adverse conditions such as vibration and impact. If the width of the gap 32 is too small, it will increase the installation accuracy requirements of the buffer frame 30, prolong the operation time, and thus affect the installation efficiency.

[0045] According to the battery pack 100 provided by this utility model, the ratio of the viscosity of the adhesive 40 to the smaller of the depth and width of the gap 32 is limited to the above-mentioned numerical range. This can prevent the adhesive 40 from overflowing through the gap 32 to the first surface 23 inside the buffer frame 30, thus limiting the free deformation of the first surface 23. It can also take into account the accuracy requirements of the buffer frame 30 during installation and the pre-tightening force provided by the buffer frame 30 to the two adjacent batteries 20, thus ensuring installation efficiency and structural reliability.

[0046] As one possible implementation, refer to Figure 5 The gap 32 is formed between the upper side surface of the bottom frame 312 and the bottom end surface of the side frame 313, and 25000≤η / a m ≤60000. For example, η / a mThe values ​​can be 25000, 28000, 31000, 34000, 37000, 40000, 43000, 46000, 49000, 52000, 54000, 56000, 58000, 59000, or 60000.

[0047] When the gap 32 is formed between the upper side of the bottom frame 312 and the bottom end face of the side frame 313, the gap 32 is at least a distance of the width of the bottom frame 312 from the adhesive 40 on the bottom plate 11. The amount of adhesive 40 overflowing to the vicinity of the gap 32 is relatively small. Therefore, the width and depth of the gap 32 can be appropriately increased to reduce the viscosity of the adhesive 40, i.e., to reduce η / a. m The upper limit.

[0048] refer to Figure 7 In a first variation of this invention, the gap 32a of the battery pack 100a is formed between the end face of the bottom frame 312a and the inner surface of the side frame 313a. 50000≤η / a m ≤250000. For example, η / a m The values ​​can be 50000, 60000, 75000, 88000, 100000, 115000, 120500, 135000, 148000, 150000, 162000, 175000, 188800, 195000, 200000, 210000, 220000, 230000, 240000, or 250000.

[0049] When the gap 32a is formed between the end face of the bottom frame 312a and the inner surface of the side frame 313a, the gap 32a is relatively close to the adhesive 40 on the base plate 11. Therefore, it is necessary to appropriately reduce the width and depth of the gap 32a and increase the viscosity of the adhesive 40, that is, increase η / a. m The lower limit is to ensure that the adhesive 40 flow does not overflow through the gap 32a to the first surface 23 of the battery 20 inside the buffer frame 30.

[0050] Back Figure 4 The gap 32 includes a second gap 322, which is formed between any one of the side frames 313 of the top frame 311. 5000≤η / a m ≤60000. For example, η / a m The values ​​can be 5000, 8000, 12000, 15000, 18000, 22000, 25000, 28000, 32000, 35000, 38000, 42000, 45000, 48000, 52000, 54000, 56000, 58000, or 60000.

[0051] If the ratio of the viscosity of the adhesive 40 to the smaller of the depth and width of the gap 32 is too small (i.e., less than 5000), the depth or width of the gap 32 will be large. If the adhesive 40 or other colloid accidentally adheres to the vicinity of the gap 32 during installation, it can easily overflow through the gap 32 to the first surface 23 inside the buffer frame 30. After the adhesive 40 or other colloid cures, it will form a hard coating layer. When the battery 20 expands in volume during charging and discharging, the adhesive 40 or other colloid will restrict its free deformation, causing stress concentration in the battery 20.

[0052] If the ratio of the viscosity of the adhesive 40 to the smaller of the depth and width of the gap 32 is too large (i.e., greater than 60000), then the depth or width of the gap 32 will be too small. If the depth of the gap 32 is too small, that is, the thickness of the buffer frame 30 is too small, this will reduce the preload provided by the buffer frame 30 to the two adjacent batteries 20, making the batteries 20 prone to displacement under adverse working conditions such as vibration and impact. If the width of the gap 32 is too small, it will increase the installation accuracy requirements of the buffer frame 30, prolong the operation time, and thus affect the installation efficiency.

[0053] According to the battery pack 100 provided by this utility model, the ratio of the viscosity of the adhesive 40 to the width of the gap 32 is limited to the above-mentioned numerical range. This ensures that the gap 32 formed between the top frame 311 and the side frame 313 generates sufficient capillary resistance, so that the adhesive 40 or other colloid flowing to this area cannot continue to flow to the inside of the buffer frame 30 due to the inability to overcome the surface tension near the gap 32. This avoids the adhesive 40 contacting the first surface 23 inside the buffer frame 30, restricting its free deformation and causing stress concentration in the battery 20. It also takes into account the accuracy requirements of the buffer frame 30 during installation and the pre-tightening force provided by the buffer frame 30 for two adjacent batteries 20, ensuring installation efficiency and structural reliability.

[0054] It should be noted that when the second gap 322 is formed between the top frame 311 and the side frame 313, it is far from the adhesive 40 on the bottom plate 11. Therefore, the probability of the battery 20 contacting the adhesive 40 when it is placed in the box is relatively low. Thus, the depth and width of the gap 32 in the first modified example can be appropriately increased to reduce the viscosity of the adhesive 40, i.e., to reduce η / a. m The upper limit.

[0055] refer to Figure 8In the second variation of this invention, the battery pack 100b has two frames 31, each including an L-shaped first frame 33 and a second frame 34 arranged in a rectangular configuration. The first frame 33 includes a top frame portion 331 and a first side frame portion 332, and the second frame 34 includes a bottom frame portion 341 and a second side frame portion 342. This reduces the number of gaps 32, thereby decreasing the probability that the adhesive 40 will contact the first surface 23 inside the buffer frame 30 through the gaps 32. Furthermore, the rectangular arrangement of the two frames 31 allows for sufficient deformation space for the first surface 23 within the area they enclose.

[0056] refer to Figure 8 The gap 32 includes a third gap 323, which is formed between the first side frame portion 332 and the bottom frame portion 341, 12500≤η / a m ≤250000. For example, η / a m The values ​​can be 12500, 25000, 40000, 55000, 70000, 85000, 100000, 115000, 125000, 140000, 150000, 160000, 175000, 190000, 200000, 210000, 220000, 230000, 240000, or 250000.

[0057] If the ratio of the viscosity of the adhesive 40 to the smaller of the depth and width of the third gap 323 is too small (i.e., less than 12500), then the depth or width of the third gap 323 will be large. The adhesive 40 will easily overflow through the third gap 323 to the first surface 23 inside the buffer frame 30. After the adhesive 40 cures, it will form a hard coating layer. When the battery 20 expands in volume during charging and discharging, the adhesive 40 will restrict its free deformation, causing stress concentration in the battery 20.

[0058] If the ratio of the viscosity of the adhesive 40 to the smaller of the depth and width of the third gap 323 is too large (i.e., greater than 250,000), then the width of the third gap 323 will be too small, and the depth of the third gap 323 will be too small, which means the thickness of the buffer frame 30 will be too small. This will reduce the preload provided by the buffer frame 30 to the two adjacent batteries 20, making the batteries 20 prone to displacement under adverse conditions such as vibration and impact. If the width of the third gap 323 is too small, it will increase the installation accuracy requirements of the buffer frame 30, prolong the operation time, and thus affect the installation efficiency.

[0059] According to the battery pack 100 provided by this utility model, the ratio of the viscosity of the adhesive 40 to the smaller of the depth and width of the third gap 323 is limited to the above-mentioned numerical range. This can prevent the adhesive 40 from overflowing through the third gap 323 to the first surface 23 inside the buffer frame 30, thus limiting the free deformation of the battery 20. It can also take into account the accuracy requirements of the buffer frame 30 during installation and the pre-tightening force provided by the buffer frame 30 to the two adjacent batteries 20, thus ensuring installation efficiency and structural reliability.

[0060] Continue to refer to Figure 8 The gap 32 also includes a fourth gap 324, which is formed between the top frame portion 331 and the second side frame portion 342, where 5000≤η / a m ≤50000. For example, η / a m The values ​​can be 5000, 6000, 7000, 10000, 13000, 16000, 19000, 22000, 25000, 28000, 31000, 34000, 37000, 40000, 42000, 44000, 46000, 48000, or 50000.

[0061] If the ratio of the viscosity of the adhesive 40 to the smaller of the depth and width of the fourth gap 324 is too small (i.e., less than 5000), then the depth or width of the fourth gap 324 will be large. The adhesive 40 will easily overflow through the fourth gap 324 to the first surface 23 inside the buffer frame 30. After the adhesive 40 cures, it will form a hard coating layer. When the battery 20 expands in volume during charging and discharging, the adhesive 40 will restrict its free deformation, causing stress concentration in the battery 20.

[0062] If the ratio of the viscosity of the adhesive 40 to the smaller of the depth and width of the fourth gap 324 is too large (i.e., greater than 50000), then the width of the fourth gap 324 will be too small, and the depth of the fourth gap 324 will be too small, which means the thickness of the buffer frame 30 will be too small. This will reduce the preload provided by the buffer frame 30 to the two adjacent batteries 20, making the batteries 20 prone to displacement under adverse conditions such as vibration and impact. If the width of the fourth gap 324 is too small, it will increase the installation accuracy requirements of the buffer frame 30, prolong the operation time, and thus affect the installation efficiency.

[0063] According to the battery pack 100 provided by this utility model, the ratio of the viscosity of the adhesive 40 to the smaller of the depth and width of the fourth gap 324 is limited to the above-mentioned numerical range. This can prevent the adhesive 40 from overflowing through the fourth gap 324 to the first surface 23 inside the buffer frame 30, thus limiting the free deformation of the battery 20. It can also take into account the accuracy requirements of the buffer frame 30 during installation and the pre-tightening force provided by the buffer frame 30 to the two adjacent batteries 20, thus ensuring installation efficiency and structural reliability.

[0064] The fourth gap 324 is further away from the base plate 11 than the third gap 323. Therefore, the probability of the battery 20 contacting the adhesive 40 when it is placed in the box is relatively small. Thus, the width and depth of the fourth gap 324 can be appropriately increased to reduce the viscosity of the adhesive 40, i.e., to reduce η / a. m The upper limit.

[0065] refer to Figure 9 In the third variation of this invention, the gap 32c of the battery pack 100c is zigzag-shaped. Compared to a straight gap 32, constructing the gap 32c as a zigzag shape can extend the flow path of the adhesive 40 from the outside to the inside of the buffer frame 30, thereby reducing the risk of the adhesive 40 overflowing to the first surface 23 inside the buffer frame 30.

[0066] It is understood that in some other embodiments, the gap 32c may also be curved. This implementation can also extend the flow path of the adhesive 40 from the outside to the inside of the buffer frame 30.

[0067] As one possible implementation, 0.2 ≤ a1 ≤ 10. For example, a1 can be 0.2, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9.5, or 10.

[0068] If the gap 32 of the buffer frame 30 is too small, i.e., less than 0.2, it will increase the installation accuracy requirements of the buffer frame 30, prolong the operation time, and thus affect the installation efficiency. If the width of the gap 32 is too large, i.e., greater than 10, the adhesive 40 will easily overflow through the gap 32 to the first surface 23 inside the buffer frame 30. After the adhesive 40 cures, it will form a hard covering layer. When the battery 20 expands in volume during charging and discharging, the adhesive 40 will restrict its free deformation, causing stress concentration in the battery 20.

[0069] According to the battery pack 100 provided by this utility model, the width of the gap 32 is limited to the above-mentioned numerical range, which can prevent the adhesive 40 from overflowing into the first surface 23 inside the buffer frame 30 through the gap 32, thus limiting the free deformation of the battery 20, and also avoids excessively increasing the installation accuracy requirements of the buffer frame 30, which is beneficial to improving installation efficiency.

[0070] As one possible implementation, 0.5 ≤ a2 ≤ 3. For example, a2 can be 0.5, 0.7, 0.9, 1.1, 1.3, 1.5, 1.7, 1.9, 2.1, 2.3, 2.5, 2.7, 2.9 or 3.

[0071] If the thickness of the buffer frame 30 is too small, i.e., less than 0.5, it will compress the deformation space reserved for the battery 20. When the battery 20 expands, due to insufficient space, its deformation will be directly transmitted to the adjacent battery 20, causing crushing damage. If the thickness of the buffer frame 30 is too large, i.e., greater than 3, it will increase the dimension of the battery pack 100 in the thickness direction, which is detrimental to space utilization and energy density.

[0072] According to the battery pack 100 provided by this utility model, the thickness of the buffer frame 30 is limited to the above-mentioned numerical range, which can provide sufficient space to release stress for the deformation of the battery 20 and avoid deformation interference between adjacent batteries 20, while not excessively increasing the size of the battery pack 100 in the thickness direction, thereby ensuring the space utilization and energy density of the battery pack 100.

[0073] As one possible implementation, 1000 ≤ η ≤ 5000. For example, η can be 1000, 1200, 1400, 1600, 1800, 2000, 2200, 2400, 2600, 2800, 3000, 3200, 3400, 3600, 3800, 4000, 4200, 4500, 4800, or 5000.

[0074] If the viscosity of the adhesive 40 is too low, i.e., less than 1000, the adhesive 40 will have good flowability. When multiple batteries 20 are installed on the base plate 11, the adhesive 40 will easily flow into the gap 32 under pressure, increasing the possibility of it overflowing into the first surface 23 inside the buffer frame 30. After the adhesive 40 cures, a hard coating layer will form on the first surface 23. When the battery 20 expands in volume during charging and discharging, the adhesive 40 will restrict its free deformation, causing stress concentration in the battery 20.

[0075] If the viscosity of adhesive 40 is too high, i.e. greater than 5000, adhesive 40 will have poor fluidity and will be prone to problems such as discontinuity and unevenness during application, affecting the bonding quality and easily leading to bonding failure under vibration and impact conditions.

[0076] According to the battery pack 100 provided by this utility model, the viscosity of the adhesive 40 is limited to the above-mentioned numerical range, which can reduce the probability of the adhesive 40 contacting the first surface 23 inside the buffer frame 30 through the gap 32, restrict the free deformation of the battery 20, and ensure the uniform coating and bonding reliability of the adhesive 40, so that multiple batteries 20 can be stably fixed to the housing 10, thereby ensuring the safety and durability of the battery pack 100.

[0077] It is understood that the material of the adhesive 40 can be implemented in various ways, and this utility model does not impose any particular restrictions on it. For example, the material of the adhesive 40 can be polyurethane, epoxy resin or two-component silicone.

[0078] <Example Electrical Equipment> refer to Figure 10 This utility model provides an electrical device 200, which includes a battery pack 100, 100a, 100b, or 100c.

[0079] By way of example only, electrical equipment 200 can be, but is not limited to, vehicles, ships, aircraft, household appliances, and industrial equipment. For example, vehicles can be passenger cars, trucks, construction vehicles, etc.

[0080] In addition, the electrical equipment 200 can also be used for the storage, conversion and release of recyclable electrical energy.

[0081] In a non-restrictive example, refer to Figure 10 The electrical equipment 200 can be an electric vehicle 200, and the battery pack 100 can be used as a power source to provide power to the electric vehicle 200.

[0082] It should be understood that the term "comprising" and its variations used in this utility model are open-ended, meaning "including but not limited to". The term "according to" means "at least in part according to". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least another embodiment".

[0083] It should be understood that although terms such as "first" or "second" may be used in this invention to describe various elements (such as the first frame and the second frame), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0084] The scope of protection of this utility model is not limited to the above embodiments. Any variations or substitutions that can be conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A battery pack (100), characterized in that, include: The box (10) includes a bottom plate (11) and a side plate (12), the bottom plate (11) and the side plate (12) enclosing a receiving space (13); Multiple batteries (20) are stacked along the thickness direction and housed in the housing space (13), and the base plate (11) supports the multiple batteries (20); Multiple buffer frames (30), with one buffer frame (30) between two adjacent batteries (20), each buffer frame (30) comprising two frame bodies (31) with a gap (32) formed between the two frame bodies (31); and An adhesive (40) is used to bond the plurality of batteries (20) to the base plate (11); wherein, The depth of the gap (32) is a1, in mm; the width of the gap (32) is a2, in mm; and the viscosity of the adhesive (40) is η, in mm² / s, where 5000 ≤ η / a m ≤250000, where a m It is the smaller of a1 and a2.

2. The battery pack (100) according to claim 1, characterized in that, The buffer frame (30) includes a top frame (311) that is strip-shaped and arranged in a rectangular shape, a bottom frame (312) and two side frames (313), and the gap (32) is formed between the bottom frame (312) and any one of the side frames (313).

3. The battery pack (100) according to claim 2, characterized in that, 25000≤η / a m ≤250000。 4. The battery pack (100) according to claim 2, characterized in that, The gap (32) is formed between the upper side of the bottom frame (312) and the bottom end face of the side frame (313).

5. The battery pack (100) according to claim 4, characterized in that, 25000≤η / a m ≤60000。 6. The battery pack (100) according to claim 2, characterized in that, The gap (32) is formed between the end face of the bottom frame (312) and the inner side face of the side frame (313).

7. The battery pack (100) according to claim 6, characterized in that, 50000≤η / a m ≤250000。 8. The battery pack (100) according to claim 1, characterized in that, The buffer frame (30) includes a top frame (311) that is strip-shaped and arranged in a rectangular shape, a bottom frame (312) and two side frames (313), and the gap (32) is formed between any one of the side frames (313) of the top frame (311).

9. The battery pack (100) according to claim 8, characterized in that, 5000≤η / a m ≤60000。 10. The battery pack (100) according to claim 1, characterized in that, The two frames (31) include an L-shaped first frame (33) and a second frame (34) arranged in a rectangle. The first frame (33) includes a top frame (331) and a first side frame (332). The second frame (34) includes a bottom frame (341) and a second side frame (342).

11. The battery pack (100) according to claim 10, characterized in that, The gap (32) is formed between the first side frame portion (332) and the bottom frame portion (341).

12. The battery pack (100) according to claim 11, characterized in that, 12500≤η / a m ≤250000。 13. The battery pack (100) according to claim 10, characterized in that, The gap (32) is formed between the top frame portion (331) and the second side frame portion (342).

14. The battery pack (100) according to claim 13, characterized in that, 5000≤η / a m ≤50000。 15. The battery pack (100) according to claim 1, characterized in that, The gap (32) is in the shape of a broken line or a curve.

16. The battery pack (100) according to claim 1, characterized in that, 0.2≤a1≤10。 17. The battery pack (100) according to claim 1, characterized in that, 0.5≤a2≤3。 18. The battery pack (100) according to claim 1, characterized in that, 1000≤η≤5000.

19. The battery pack (100) according to claim 1, characterized in that, The adhesive (40) is made of polyurethane, epoxy resin or two-component silicone.

20. An electrical appliance (200), characterized in that, Includes the battery pack (100) according to any one of claims 1 to 19.

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