Battery pack and electric device with same

Abstract

The utility model relates to battery technology field provides a kind of battery pack and the electric equipment with it. Battery pack includes box, multiple batteries, multiple buffer frame and colloid. Box is equipped with box space. Multiple batteries are arranged in box space along the first direction. Each buffer frame is located between two adjacent batteries, and each buffer frame includes multiple buffer strips, and a gap is formed between two adjacent buffer strips. Colloid is filled in the gap to block the path from the outside of the buffer frame to its inside through the gap, thereby reducing the probability of structural adhesive contacting the large surface of the battery inside the buffer frame. When the battery expands in volume during charging and discharging, the space enclosed by the large surface of the two adjacent batteries and the buffer frame can deform, releasing mechanical stress. This deformation process is not constrained by the curing structural adhesive, so it can avoid stress concentration caused by local constraints, thereby reducing the risk of lithium precipitation and ensuring the safety performance of the battery.

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 rapid development of new energy vehicles and energy storage systems, batteries have gained widespread application due to their high energy density and long cycle life. In some battery assembly processes, to secure the batteries inside the enclosure and prevent movement, individual batteries are first stacked into groups and bound together with straps. Then, structural adhesive is applied to the bottom plate of the enclosure, and the battery pack is placed inside and pressed together. After the adhesive has fully cured, the battery pack is firmly bonded to the bottom plate of the enclosure, achieving reliable fixation.

[0003] In related technologies, a buffer frame is typically installed between two adjacent batteries. When the batteries are stacked together and pressure is applied by a fixing strap, the buffer frame accumulates elastic potential energy due to deformation under pressure. After the external force is removed, this elastic potential energy is released, thereby creating a pre-tightening force on the adjacent batteries to suppress their displacement under adverse conditions such as vibration and impact. The buffer frame is usually composed of multiple buffer strips spliced ​​together, with gaps existing at the joints between the buffer strips.

[0004] However, during the battery assembly stage, the structural adhesive on the bottom plate of the casing is still in a liquid state. Under pressure, it can easily seep upwards along the gaps and spread to the battery surface. After the structural adhesive cures, it forms a hard coating layer on the battery surface. When the battery expands in volume during charging and discharging, the structural adhesive restricts its free deformation, causing stress concentration on the battery surface. This stress concentration not only affects lithium-ion transport within the battery but also increases the risk of lithium plating, impacting 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 that structural adhesive restricts the free deformation of the battery when it expands.

[0006] In a first aspect, the battery pack provided by this utility model includes a housing, multiple batteries, multiple buffer frames, and a gel. The housing has an internal space. The multiple batteries are arranged in the internal space along a first direction. Each buffer frame is disposed between two adjacent batteries, and each buffer frame includes multiple buffer strips, with gaps formed between two adjacent buffer strips. The gel fills the gaps to block the path from the outside to the inside of the buffer frame through the gaps.

[0007] Secondly, the electrical equipment provided by this utility model includes the battery pack of the first aspect.

[0008] The beneficial effects of the battery pack provided by this utility model are as follows: By blocking the path of the structural adhesive from the outside to the inside of the buffer frame, the area of ​​contact between the structural adhesive and the battery's large surface through the gap can be reduced. When the battery expands in volume during charging and discharging, it can deform towards the space enclosed by the two adjacent battery large surfaces and the buffer frame, releasing mechanical stress. Since this deformation process is not constrained by the cured structural adhesive, stress concentration caused by local constraints can be avoided, thereby reducing the risk of lithium plating and ensuring the battery's safety performance. 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 schematic diagram of a portion of a battery pack according to the fourth modification of this utility model.

[0023] Figure 11 This is a structural schematic diagram of a portion of a battery pack according to the fifth modification of this utility model.

[0024] Figure 12 yes Figure 2 A schematic diagram of a portion of the battery pack.

[0025] Figure 13 This is a structural schematic diagram of a portion of a battery pack according to the sixth modification of this utility model.

[0026] Figure 14 This is a structural schematic diagram of an electrical device according to an embodiment of the present utility model.

[0027] Explanation of reference numerals in the attached drawings: Battery pack - 100; Box body - 10; Internal space - 11; Battery - 20; Shell - 21; Cell - 22; Buffer frame - 30; Buffer strip - 31; First mating surface - 3111; Second mating surface - 3112; First buffer strip - 311; Second buffer strip - 312; Gap - 32; First bending section - 321; Second bending section - 322; Glue - 40; Side buffer strip - 313; Bottom buffer strip - 314; Top buffer strip - 315. Detailed Implementation

[0028] 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.

[0029] <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.

[0030] 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.

[0031] refer to Figure 3 The battery 20 includes a casing 21 and a cell 22.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] Continue to refer to Figure 3 In the current embodiment, the battery 20 has two parallel battery surfaces 23 in a first direction, which is the thickness direction of the battery 20. The battery surface 23 is the largest of the six outer surfaces of the battery 20. For the wound or stacked cell 22, the battery 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 battery surface 23 in the first direction.

[0036] 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 up and down direction; arrows X+ and X- are used to indicate opposite sides in the first direction; arrows Y+ and Y- are used to indicate opposite sides in the length direction, and the up and down direction, the first direction, and the length direction are perpendicular to each other.

[0037] <Example Battery Pack> refer to Figure 1 and Figure 2 The battery pack 100 provided in this embodiment of the present invention includes a plurality of batteries 20 and a housing 10. The housing 10 has an internal space 11, in which the plurality of batteries 20 are arranged along a first direction.

[0038] Combination Figure 4and Figure 5 The battery pack 100 provided by this utility model includes multiple buffer frames 30 and an adhesive 40. Each buffer frame 30 is disposed between two adjacent batteries 20, that is, between two large battery surfaces 23 of two batteries 20 facing each other in a first direction. Each buffer frame 30 includes multiple buffer strips 31, and a gap 32 is formed between two adjacent buffer strips 31. The adhesive 40 is filled in the gap 32 to block the path from the outside to the inside of the buffer frame 30 through the gap 32. By blocking the path of the structural adhesive from the outside to the inside of the buffer frame 30, the probability of the structural adhesive contacting the large battery surface 23 inside the buffer frame 30 through the gap 32 can be reduced. This allows the battery 20 to deform towards the space enclosed by the two adjacent large battery surfaces 23 and the buffer frame 30 when it expands in volume during charging and discharging, releasing mechanical stress. This deformation process is not constrained by the cured structural adhesive, thus avoiding stress concentration caused by local constraints, thereby reducing the risk of lithium plating and ensuring the safety performance of the battery 20.

[0039] It is understood that there are multiple ways to place the buffer frame 30 between two adjacent batteries 20, and this 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 can be pasted onto the heat insulation pad.

[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 outer side of the buffer frame 30 refers to the side of the buffer strip 31 away from the space enclosed by the two adjacent battery surfaces 23 and the buffer frame 30 on a plane perpendicular to the first direction. The inner side of the buffer frame 30 refers to the side of the buffer strip 31 closer to the space enclosed by the two adjacent battery surfaces 23 and the buffer frame 30 on a plane perpendicular to the first direction.

[0041] refer to Figure 5 The outer end of the colloid 40 along its length is flush with the outer end of the gap 32 along its length. This allows the colloid 40 to completely seal the gap 32 along its length, preventing the structural adhesive from contacting the battery surface 23 located inside the buffer frame 30 through the gap 32. Furthermore, aligning the outer end of the colloid 40 with the outer end of the gap 32 along its length also prevents the colloid 40 from extending beyond the edge of the battery 20 along its length, thereby preventing interference with the housing 10 or other batteries 20 when the battery 20 is installed in the housing 10.

[0042] refer to Figure 7In the first variation provided by this utility model, the outer end of the colloid 40a of the battery pack 100a protrudes beyond the outer end of the gap 32 in the length direction. This implementation improves the application efficiency of the colloid 40a by relaxing the requirement for flushness between the outer end of the colloid 40a and the outer end of the outer gap 32, thereby shortening the operation time.

[0043] Continue to refer to Figure 7 The dimension of the outer end of colloid 40a extending beyond the outer end of gap 32 in its length direction is L1, in mm, where 0.1 ≤ L1 ≤ 5. For example, L1 can be 0.1, 0.2, 0.35, 0.5, 0.75, 1, 1.3, 1.6, 2, 2.4, 2.8, 3.2, 3.7, 4.3, or 5.

[0044] If the outer end of colloid 40a in its length direction exceeds the outer end of gap 32 in its length direction by too small a size, i.e. less than 0.1 mm, this will increase the process requirements of the coating operation, prolong the operation time, and thus affect the manufacturing efficiency.

[0045] If the outer end of the colloid 40a in its length direction exceeds the outer end of the gap 32 in its length direction by too much, i.e. greater than 5 mm, this will increase the risk that the colloid 40a will extend beyond the edge of the battery 20 in its length direction. When the battery 20 is subsequently installed into the housing 10, it is easy to interfere with the housing 10 or other batteries 20, which is not conducive to the smoothness of assembly.

[0046] According to the battery pack 100a provided by this utility model, the outer end of the colloid 40a in its length direction exceeds the outer end of the gap 32 in its length direction within the above-mentioned numerical range. This can prevent the colloid 40a from exceeding the edge of the battery 20 in its length direction, thereby avoiding interference between the battery 20 and the housing 10 or other batteries 20 when the battery 20 is subsequently installed in the housing 10. It also does not excessively increase the process requirements of the coating operation, thereby ensuring the manufacturing efficiency of the battery pack 100a.

[0047] refer to Figure 8 In the second variation provided by this utility model, the outer end of the colloid 40b of the battery pack 100b in its length direction is shorter than the outer end of the gap 32 in its length direction. This implementation can improve the coating efficiency of the colloid 40b and shorten the operation time by relaxing the requirement for the flushness between the outer end of the colloid 40b and the outer gap 32.

[0048] Continue to refer to Figure 8The outer end of colloid 40b is shorter than the outer end of gap 32 in the length direction by a dimension L2, in mm, where 0.1 ≤ L2 ≤ 5. For example, L2 can be 0.1, 0.2, 0.35, 0.5, 0.75, 1, 1.3, 1.6, 2, 2.4, 2.8, 3.2, 3.7, 4.3, or 5.

[0049] If the outer end of the colloid 40b in its length direction is shorter than the outer end of the gap 32 in its length direction, i.e. less than 0.1 mm, this will increase the process requirements of the coating operation, prolong the operation time, and thus affect the manufacturing efficiency.

[0050] If the outer end of the colloid 40b in its length direction is too short (i.e., greater than 5 mm) compared to the outer end of the gap 32 in its length direction, then the dimension of the colloid 40b in its length direction is too small, which will weaken the connection strength between the colloid 40b and the buffer frame 30. When the structural adhesive flows through the gap 32, the connection between the colloid 40b and the buffer frame 30 is easily broken, causing the structural adhesive to overflow onto the battery surface 23 inside the buffer frame 30. After the structural adhesive cures, a hard covering layer will form on the battery surface 23. When the battery 20 expands in volume during charging and discharging, the structural adhesive will restrict its free deformation, causing stress concentration on the battery surface 23.

[0051] According to the battery pack 100b provided by this utility model, the outer end of the colloid 40b in its length direction is shorter than the outer end of the gap 32 in its length direction within the above-mentioned numerical range. This can reduce the risk that the connection between the colloid 40b and the buffer frame 30 is easily damaged, thereby ensuring that the colloid 40b effectively blocks the path of the structural adhesive from the outside of the buffer frame 30 to the inside of the buffer frame 30, without excessively increasing the process requirements of the coating operation, thereby ensuring the manufacturing efficiency of the battery pack 100b.

[0052] Back Figure 4 In the battery pack 100, the width of the gap 32, that is, the dimension of the gap 32 in the vertical direction, is W1, in mm, and 0.1≤W1≤3. For example, W1 can be 0.1, 0.15, 0.25, 0.4, 0.6, 0.8, 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8 or 3.

[0053] If the width of gap 32 is small, i.e., less than 0.1 mm, the adhesive 40 will face significant fluid resistance during application, making it difficult to fully fill gap 32 and potentially leading to discontinuous filling or insufficient adhesive. Consequently, the structural adhesive may overflow through gap 32 onto the battery surface 23 inside the buffer frame 30. After curing, the structural adhesive will form a hard coating layer on the battery surface 23. When the battery 20 expands in volume during charging and discharging, the structural adhesive will restrict its free deformation, causing stress concentration on the battery surface 23.

[0054] If the gap 32 is too wide, i.e. greater than 3 mm, it will not only increase the amount of adhesive used and the manufacturing cost, but also easily trap air during the coating process, thereby weakening the connection strength between the adhesive 40 and the buffer frame 30.

[0055] According to the battery pack 100 provided by this utility model, limiting the width of the gap 32 to the above-mentioned numerical range can ensure that the colloid 40 can be smoothly filled and effectively sealed to the gap 32, control the amount of colloid 40 to optimize costs, and ensure the connection strength between the colloid 40 and the buffer frame 30.

[0056] refer to Figure 6 The thickness of the buffer frame 30 is T1 in mm, and the thickness of the colloid 40 is T2 in mm. 0.9 ≤ T1 / T2 ≤ 1.1. For example, T1 / T2 can be 0.9, 0.92, 0.94, 0.96, 0.98, 1, 1.02, 1.04, 1.06, 1.08 or 1.1.

[0057] If the ratio of the thickness of the buffer frame 30 to the thickness of the colloid 40 is small, i.e. less than 0.9, the colloid 40 extends beyond the buffer frame 30 in the first direction and squeezes the battery 20 after curing, resulting in stress concentration.

[0058] If the ratio of the thickness of the buffer frame 30 to the thickness of the colloid 40 is large, i.e., greater than 1.1, then the thickness of the colloid 40 is small. As a result, the colloid 40 cannot completely seal the gap 32 in the first direction, and the structural adhesive may overflow through the gap 32 to the battery surface 23 inside the buffer frame 30. After the structural adhesive cures, it forms a hard covering layer on the battery surface 23. When the battery 20 expands in volume during charging and discharging, the structural adhesive restricts its free deformation, causing stress concentration on the battery surface 23.

[0059] According to the battery pack 100 provided by this utility model, the ratio of the thickness of the buffer frame 30 to the thickness of the colloid 40 is limited to the above-mentioned numerical range. This can prevent the structural adhesive from overflowing through the gap 32 to the battery surface 23 inside the buffer frame 30, thus limiting the free deformation of the battery surface 23, and can also prevent the colloid 40 from squeezing the battery 20, causing stress concentration.

[0060] As one possible implementation, the thickness of the buffer frame 30 is T1 in mm. T1 can satisfy: 0.5≤T1≤10. For example, T1 can be 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, 9.5 or 10.

[0061] If the thickness of the buffer frame 30 is small, i.e., less than 0.5 mm, 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 large, i.e. greater than 10 mm, it will increase the size of the battery pack 100 in the first direction, which is detrimental to space utilization and energy density.

[0062] 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 first direction, thereby ensuring the space utilization and energy density of the battery pack 100.

[0063] As one possible implementation, the thickness of colloid 40 is T2, in mm, and T2 can satisfy: 0.5 ≤ T2 ≤ 10. For example, T2 can be 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, 9.5, or 10.

[0064] If the thickness of the adhesive 40 is small, i.e., less than 0.5 mm, the adhesive 40 cannot completely seal the gap 32 in the first direction. As a result, the structural adhesive may overflow through the gap 32 to the battery surface 23 inside the buffer frame 30. After the structural adhesive cures, it will form a hard coating layer on the battery surface 23. When the battery 20 expands in volume during charging and discharging, the structural adhesive will restrict its free deformation, causing stress concentration on the battery surface 23.

[0065] If the thickness of the colloid 40 is large, i.e. greater than 10 mm, the colloid 40 extends beyond the buffer frame 30 in the first direction and compresses the battery 20 after curing, causing stress concentration in the battery 20.

[0066] According to the battery pack 100 provided by this utility model, the thickness of the colloid 40 is limited to the above-mentioned numerical range, which can prevent the structural adhesive from overflowing through the gap 32 to the battery surface 23 inside the buffer frame 30, thus limiting the free deformation of the battery surface 23, and also prevent the colloid 40 from exceeding the buffer frame 30 and squeezing the battery 20, resulting in stress concentration.

[0067] refer to Figure 4 and Figure 5 The two buffer strips 31 are perpendicular to each other. Utilizing the elastic compression of the buffer strips 31, a pre-tightening force can be provided to the two adjacent batteries 20 when they are stacked, to resist displacement of the batteries 20 under adverse conditions such as vibration and impact. Furthermore, the perpendicular arrangement of the two buffer strips 31 allows sufficient deformation space to be reserved for the large surface 23 of the battery within the area they enclose.

[0068] refer to Figure 4 The two buffer bars 31 include a first buffer bar 311 and a second buffer bar 312, and a gap 32 is formed between the end face of the first buffer bar 311 and the side face of the second buffer bar 312.

[0069] refer to Figure 5 The distance from the first buffer strip 311 to the edge of the corresponding battery 20 is D1, in mm, where 0 < D1 ≤ 10. For example, D1 can be 0.1, 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, 9.5, or 10.

[0070] If the distance from the first buffer strip 311 to the edge of the corresponding battery 20 is too small, i.e. equal to 0 mm, then the distance from the gap 32 to the edge of the battery 20 will be small. This will increase the risk that the colloid 40 will extend beyond the edge of the battery 20. When the battery 20 is subsequently installed into the housing 10, it is easy to interfere with the housing 10 or other batteries 20, which is not conducive to smooth assembly.

[0071] If the distance from the first buffer strip 311 to the edge of the corresponding battery 20 is too large, i.e. greater than 10 mm, it will be compressed into 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.

[0072] According to the battery pack 100 provided by this utility model, the distance from the first buffer strip 311 to the edge of the corresponding battery 20 is limited to the above-mentioned numerical range. This can prevent the colloid 40 from exceeding the edge of the length direction of the battery 20, and can also provide sufficient space for the deformation of the battery 20 to release stress, thus avoiding deformation interference between adjacent batteries 20.

[0073] It should be noted that the distance from the first buffer strip 311 to the edge of the corresponding battery 20 refers to the minimum distance from the first buffer strip 311 to the edge of the battery 20 parallel to it.

[0074] refer to Figure 5The first buffer strip 311 is a side buffer strip, and the second buffer strip 312 is a bottom buffer strip, where 1 ≤ D1 ≤ 10. For example, D1 can be 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, 9.5, or 10.

[0075] If the distance from the first buffer strip 311 to the edge of the corresponding battery 20 is too small, i.e. less than 1 mm, the distance from the gap 32 to the edge of the battery 20 will be small. This will increase the risk that the colloid 40 will extend beyond the edge of the battery 20. When the battery 20 is subsequently installed into the housing 10, it is easy to interfere with the housing 10 or other batteries 20, which will not be conducive to the smoothness of assembly.

[0076] If the distance from the first buffer strip 311 to the edge of the corresponding battery 20 is too large, i.e. greater than 10 mm, it will be compressed into 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.

[0077] According to the battery pack 100 provided by this utility model, the distance from the first buffer strip 311 to the edge of the corresponding battery 20 is limited to the above-mentioned numerical range. This can prevent the colloid 40 from exceeding the edge of the battery 20, thereby preventing the battery 20 from interfering with the housing 10 or adjacent batteries 20 when it is subsequently installed into the housing 10. It can also provide sufficient space for the deformation of the battery 20 to release stress and avoid deformation interference between adjacent batteries 20.

[0078] In the third variation provided by this utility model, reference is made to Figure 9 In battery pack 100c, the first buffer strip 311 is the bottom buffer strip, and the second buffer strip 312 is the side buffer strip, where 0 < D1 ≤ 3. For example, D1 can be 0.1, 0.2, 0.4, 0.6, 0.8, 1, 1.3, 1.5, 1.7, 2, 2.2, 2.4, 2.6, 2.8, or 3.

[0079] If the distance from the first buffer strip 311 to the edge of the corresponding battery 20 is too small, i.e., equal to 0 mm, then the distance from the gap 32 to the edge of the battery 20 will be small, and the distance from the gap 32 to the structural adhesive at the bottom of the battery 20 will be small. As a result, when the battery 20 is placed in the casing, the structural adhesive may overflow over the first buffer strip 311 onto the large surface 23 of the battery. After the structural adhesive cures, it will form a hard covering layer on the large surface 23 of the battery. When the battery 20 expands in volume during charging and discharging, the structural adhesive will restrict its free deformation, causing stress concentration on the large surface 23 of the battery.

[0080] If the distance from the first buffer strip 311 to the edge of the corresponding battery 20 is too large, i.e. greater than 3 mm, then a large portion of the area near the bottom of the battery surface 23 will be covered by structural adhesive. When the battery 20 expands in volume during charging and discharging, the structural adhesive will restrict its free deformation, resulting in stress concentration on the battery surface 23.

[0081] According to the battery pack 100 provided by this utility model, the distance from the first buffer strip 311 to the edge of the corresponding battery 20 is limited to the above-mentioned numerical range. This can prevent the colloid 40 from overflowing onto the battery surface 23 and limit the area of ​​the battery surface 23 covered by structural adhesive, so that the battery surface 23 is less constrained by structural adhesive, thus avoiding stress concentration.

[0082] refer to Figure 10 In the fourth variation of this invention, the gap 32 of the battery pack 100d has a bent structure. The gap 32 includes a first bent segment 321 and a second bent segment 322. The first buffer strip 311 includes a first mating surface 3111 and a second mating surface 3112 that are perpendicular to each other. The first bent segment 321 is formed between the end faces of the first mating surface 3111 and the second buffer strip 312, and the second bent segment 322 is formed between the second mating surface 3112 and the side faces of the second buffer strip 312. Compared to a straight gap 32, constructing the gap 32 with the first bent segment 321 and the second bent segment 322 can extend the flow path of the colloid 40 from the outside to the inside of the buffer frame 30, thereby reducing the risk of the colloid 40 overflowing onto the battery surface 23. Furthermore, after the colloid 40 cures in the gap 32, the first buffer strip 311 and the second buffer strip 312 can restrict the displacement of the colloid 40 in the vertical direction and the first direction, thereby preventing the colloid 40 from moving accidentally.

[0083] refer to Figure 11 In the fifth variation of this invention, the gap 32 of the battery pack 100e is formed between the two end faces of the two buffer strips 31, the two end faces being parallel to each other and obliquely intersecting either of the two buffer strips 31. Compared to a straight gap 32, the oblique intersection of the gap 32 with either of the two buffer strips 31 can extend the flow path of the colloid 40 from the outside to the inside of the buffer frame 30, thereby reducing the risk of the colloid 40 overflowing onto the battery surface 23.

[0084] It can be understood that the end face intersecting the buffer strip 31 at an oblique angle means that the end face and the length direction of the buffer strip 31 are neither parallel nor perpendicular, but intersecting at an oblique angle.

[0085] It is understandable that the shape of the buffer frame 30 can be implemented in various ways; for example, multiple buffer strips 31 can be arranged in a rectangle. (See reference) Figure 12The buffer frame 30 includes a top buffer strip 315, a bottom buffer strip 314, and two side buffer strips 313. The gap 32 formed between any side buffer strip 313 and the bottom buffer strip 314 is filled with adhesive 40, while the gap 32 formed between any side buffer strip 313 and the top buffer strip 315 is not filled with adhesive 40. Since the structural adhesive is located at the bottom of the battery 20, filling the gap 32 between the side buffer strips 313 and the bottom buffer strip 314 with adhesive 40 not only effectively prevents the structural adhesive near the bottom of the battery 20 from flowing from the outside to the inside of the buffer frame 30 through the gap 32, but also reduces the amount of adhesive 40 used, simplifies the manufacturing process, and improves production efficiency.

[0086] refer to Figure 13 In the sixth variation of this utility model, the buffer frame 30 of the battery pack 100f includes a top buffer strip 315, a bottom buffer strip 314, and two side buffer strips 313 arranged in a rectangular shape. The gap 32 formed between any two adjacent buffer strips 31 is filled with colloid 40. This implementation method allows the large surface 23 of adjacent batteries 20 and the buffer frame 30 to form a closed space, preventing foreign objects from entering during manufacturing and avoiding interference with the volume expansion of the batteries 20 during charging and discharging, thereby ensuring the safety of the batteries 20.

[0087] As one possible implementation, the elastic modulus of the buffer frame 30 is E1 (in MPa), and the elastic modulus of the colloid 40 is E2 (in MPa), with 0.9 ≤ E1 / E2 ≤ 1.1. For example, E1 / E2 can be 0.9, 0.92, 0.94, 0.96, 0.98, 1, 1.02, 1.04, 1.07, or 1.1.

[0088] If the ratio of the elastic modulus of the buffer frame 30 to that of the colloid 40 is too small (less than 0.9), the elastic modulus of the buffer frame 30 will be low. When the battery 20 expands in volume during charging and discharging, the buffer frame 30 will easily deform, weakening the connection between the colloid 40b and the buffer frame 30. This will cause the structural adhesive to overflow through the gap 32 onto the battery surface 23 inside the buffer frame 30. After the structural adhesive cures, a hard covering layer will form on the battery surface 23. When the battery 20 expands in volume during charging and discharging, the structural adhesive will restrict its free deformation, causing stress concentration on the battery surface 23.

[0089] If the ratio of the elastic modulus of the buffer frame 30 to the elastic modulus of the colloid 40 is too large, i.e. greater than 1.1, then the elastic modulus of the buffer frame 30 is large. 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.

[0090] According to the battery pack 100 provided by this utility model, the ratio of the elastic modulus of the buffer frame 30 to the elastic modulus of the colloid 40 is limited to the above-mentioned numerical range. This can prevent the structural adhesive from overflowing through the gap 32 to the battery surface 23 inside the buffer frame 30, thus limiting the free deformation of the battery surface 23, and can also ensure that the buffer frame 30 provides pre-tightening force for the two adjacent batteries 20.

[0091] As one possible implementation, the elastic modulus of the buffer frame 30 is E1, with units of MPa. E1 can satisfy: 1≤E1≤100. For example, E1 can be 1, 2, 3, 5, 7, 10, 15, 20, 25, 30, 40, 50, 60, 70, 80, 90 or 100.

[0092] If the elastic modulus of the buffer frame 30 is too small, i.e., less than 1, the buffer frame 30 is prone to deformation when the battery 20 expands in volume during charging and discharging. This weakens the connection strength between the adhesive 40b and the buffer frame 30, causing the structural adhesive to overflow through the gap 32 to the battery surface 23 inside the buffer frame 30. After the structural adhesive cures, a hard covering layer will form on the battery surface 23. When the battery 20 expands in volume during charging and discharging, the structural adhesive will restrict its free deformation, causing stress concentration on the battery surface 23.

[0093] If the elastic modulus of the buffer frame 30 is too large, i.e. greater than 100, it 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.

[0094] According to the battery pack 100 provided by this utility model, the elastic modulus of the buffer frame 30 is limited to the above-mentioned numerical range, which can both prevent the structural adhesive from overflowing through the gap 32 to the battery surface 23 inside the buffer frame 30, thus limiting the free deformation of the battery surface 23, and ensure the pre-tightening force provided by the buffer frame 30 for the two adjacent batteries 20.

[0095] As one possible implementation, the elastic modulus of colloid 40 is E2, in MPa, and E2 can satisfy: 0.1 ≤ E2 ≤ 100. For example, E2 can be 0.1, 0.2, 0.5, 1, 2, 3, 5, 7, 10, 15, 20, 25, 30, 40, 50, 60, 70, 80, 90, or 100.

[0096] If the elastic modulus of colloid 40 is too small, i.e. less than 0.1, colloid 40 is prone to deformation when the battery 20 expands in volume during charging and discharging. This weakens the connection strength between colloid 40b and buffer frame 30, causing the structural adhesive to overflow through gap 32 to the battery surface 23 inside buffer frame 30. After the structural adhesive cures, a hard covering layer will form on the battery surface 23. When the battery 20 expands in volume during charging and discharging, the structural adhesive will restrict its free deformation, causing stress concentration on the battery surface 23.

[0097] If the elastic modulus of the colloid 40 is too large, i.e. greater than 100, the colloid 40 is not easy to deform. When the battery 20 expands, the part of the buffer frame 30 that contacts the colloid 40 is easily squeezed and damaged, thereby reducing the pre-tightening force provided by the buffer frame 30 to the two adjacent batteries 20, making the battery 20 easy to displace under adverse working conditions such as vibration and impact.

[0098] According to the battery pack 100 provided by this utility model, the elastic modulus of the colloid 40 is limited to the above-mentioned numerical range, which can both prevent the structural adhesive from overflowing through the gap 32 to the battery surface 23 inside the buffer frame 30, thus limiting the free deformation of the battery surface 23, and ensure that the buffer frame 30 provides pre-tightening force for the two adjacent batteries 20.

[0099] It is understood that the materials of the buffer frame 30 and the colloid 40 can be implemented in various ways, and this utility model does not impose any particular limitation on them. As an example, the buffer frame 30 can be made of silicone, and the colloid 40 can be made of polyurethane or epoxy resin.

[0100] <Example Electrical Equipment> refer to Figure 14 This utility model provides an electrical device 200, which includes a battery pack 100.

[0101] 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.

[0102] In addition, the electrical equipment 200 can also be used for the storage, conversion and release of recyclable electrical energy.

[0103] In a non-restrictive example, refer to Figure 14 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.

[0104] 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".

[0105] 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 buffer strip and the second buffer strip), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0106] 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 body (10) has an internal space (11); Multiple batteries (20) are arranged in the internal space (11) of the box along a first direction; Multiple buffer frames (30), each buffer frame (30) is disposed between two adjacent batteries (20), each buffer frame (30) includes multiple buffer strips (31), and a gap (32) is formed between two adjacent buffer strips (31); and A colloid (40) is filled in the gap (32) to block the path through the gap (32) from the outside to the inside of the buffer frame (30).

2. The battery pack (100) according to claim 1, characterized in that, The outer end of the colloid (40) in its length direction is flush with the outer end of the gap (32) in its length direction.

3. The battery pack (100) according to claim 1, characterized in that, The colloid (40) protrudes beyond the outer end of the gap (32) in its length direction.

4. The battery pack (100) according to claim 3, characterized in that, The outer end of the colloid (40) in its length direction extends beyond the outer end of the gap (32) in its length direction by a dimension L1, in mm, where 0.1 ≤ L1 ≤ 5.

5. The battery pack (100) according to claim 1, characterized in that, The outer end of the colloid (40) in its length direction is shorter than the outer end of the gap (32) in its length direction.

6. The battery pack (100) according to claim 5, characterized in that, The outer end of the colloid (40) in its length direction is shorter than the outer end of the gap (32) in its length direction. The dimension of the outer end of the gap (32) in its length direction is L2, in mm, and 0.1≤L2≤5.

7. The battery pack (100) according to claim 1, characterized in that, The width of the gap (32) is W1, in mm, and 0.1≤W1≤3.

8. The battery pack (100) according to claim 1, characterized in that, The thickness of the buffer frame (30) is T1 in mm, the thickness of the colloid (40) is T2 in mm, 0.9≤T1 / T2≤1.1, and / or, 0.5≤T1≤10, and / or, 0.5≤T2≤10.

9. The battery pack (100) according to claim 1, characterized in that, The two buffer bars (31) are perpendicular to each other.

10. The battery pack (100) according to claim 9, characterized in that, The two buffer bars (31) include a first buffer bar (311) and a second buffer bar (312), and the gap (32) is formed between the end face of the first buffer bar (311) and the side face of the second buffer bar (312).

11. The battery pack (100) according to claim 10, characterized in that, The distance from the first buffer strip (311) to the edge of the corresponding battery (20) is D1, in mm, where 0 < D1 ≤ 10.

12. The battery pack (100) according to claim 11, characterized in that, The first buffer bar (311) is a side buffer bar, and the second buffer bar (312) is a bottom buffer bar, 1≤D1≤10.

13. The battery pack (100) according to claim 11, characterized in that, The first buffer bar (311) is a bottom buffer bar, and the second buffer bar (312) is a side buffer bar, 0 < D1 ≤ 3.

14. The battery pack (100) according to claim 10, characterized in that, The gap (32) has a bent structure.

15. The battery pack (100) according to claim 9, characterized in that, The gap (32) is formed between the two end faces of the two buffer strips (31), which are parallel to each other and oblique to either of the two buffer strips (31).

16. The battery pack (100) according to claim 1, characterized in that, The buffer frame (30) includes a top buffer strip (315), a bottom buffer strip (314), and two side buffer strips (313) arranged in a rectangle. The gap (32) formed between any side buffer strip (313) and the bottom buffer strip (314) is filled with the colloid (40), and the gap (32) formed between any side buffer strip (313) and the top buffer strip (315) is not filled with the colloid (40).

17. The battery pack (100) according to claim 1, characterized in that, The buffer frame (30) includes a top buffer strip (315), a bottom buffer strip (314), and two side buffer strips (313) arranged in a rectangular shape, and the gap (32) formed between any two adjacent buffer strips is filled with the colloid (40).

18. The battery pack (100) according to any one of claims 1 to 17, characterized in that, The elastic modulus of the buffer frame (30) is E1, in MPa, and the elastic modulus of the colloid (40) is E2, in MPa, 0.9≤E1 / E2≤1.1, and / or, 1≤E1≤100, and / or, 0.1≤E2≤100.

19. The battery pack (100) according to claim 18, characterized in that, The buffer frame (30) is made of silicone, and / or the colloid (40) is made of polyurethane or epoxy resin.

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

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