Battery pack and power-consuming device

Abstract

Battery pack, characterized in that it comprises a base plate (102) and a cylindrical battery group provided on the base plate (102), wherein the cylindrical battery group comprises a plurality of cylindrical batteries (200), wherein the axial direction of the cylindrical batteries (200) is parallel to the base plate (102); wherein a thermal insulation layer (104) and an adhesive layer (105) are provided between at least one of the cylinder batteries (200) and the base plate (102), wherein the thermal insulation layer (104) and the adhesive layer (105) are distributed along the axial direction of the cylinder batteries (200); wherein, along the axial direction of the cylindrical batteries (200), the length of the orthogonal projection of the cylindrical battery (200) onto the base plate (102) which overlaps with the thermal insulation layer (104) is referred to as a, while the length which overlaps with the adhesive layer (105) but not with the thermal insulation layer (104) is referred to as b, wherein the ratio a / b satisfies the following: 3.5 ≤ a / b ≤ 12.

Description

Technical field

[0001] The present application relates to the technical field of energy storage devices, in particular a battery pack and a power-consuming device. Technical background

[0002] The thermal insulation performance of a battery pack is closely related to its range, especially in low-temperature environments. The battery's operating temperature range directly affects its discharge efficiency, capacity retention rate, and lifespan, which in turn influences the electric vehicle's range. Optimizing the battery pack's thermal insulation design can lower the battery's lower temperature limit, thereby mitigating the negative effects of low temperatures.

[0003] Currently, a thermal insulation layer is typically applied to the base plate of the battery pack to minimize heat loss, increase range, and reduce energy consumption for heating. Cylindrical batteries are usually attached to the base plate with adhesive to ensure stability. When a thermal insulation layer is applied to the base plate, the cylindrical batteries are typically attached to this layer. However, because the thermal insulation layer is made of a soft material, the adhesive strength between the cylindrical batteries and the layer is relatively weak. This can cause the cylindrical batteries to detach under vibration conditions.

[0004] Therefore, the challenge for experts is to improve the secure fastening of cylindrical batteries while maintaining thermal insulation performance. Content of the invention

[0005] In light of this, the purpose of the present application is to provide a battery pack that improves the secure fastening of cylindrical batteries while maintaining thermal insulation performance.

[0006] Another purpose of the present application is to provide a power-consuming device comprising the above battery pack.

[0007] To achieve the above purpose, the present application provides the following technical solution:

[0008] A first aspect of the present application provides a battery pack comprising a base plate and a cylindrical battery group provided on the base plate, wherein the cylindrical battery group comprises a plurality of cylindrical batteries, the axial direction of the cylindrical batteries being parallel to the base plate;

[0009] wherein a thermal insulation layer and an adhesive layer are provided between at least one of the cylinder batteries and the base plate, wherein the thermal insulation layer and the adhesive layer are distributed along the axial direction of the cylinder batteries;

[0010] where, along the axial direction of the cylindrical batteries, the length of the orthogonal projection of the cylindrical battery onto the base plate, which overlaps with the thermal insulation layer, is designated as a, while the length, which overlaps with the adhesive layer but not with the thermal insulation layer, is designated as b, where the ratio a / b satisfies the following: 3.5 ≤ a / b ≤ 12.

[0011] The battery pack of the present application comprises a base plate and a cylindrical battery group provided on the base plate, wherein a thermal insulation layer and an adhesive layer are provided between at least one of the cylindrical batteries and the base plate. In this way, the thermal insulation layer does not have to be applied over the entire base plate, thus leaving an area for the adhesive layer to be applied. Part of the cylindrical battery is arranged on the thermal insulation layer, while another part is bonded and fastened over the adhesive layer. In the orthogonal projection of the cylindrical battery onto the base plate, the length that overlaps with the thermal insulation layer is designated as a, while the length that overlaps with the adhesive layer but not with the thermal insulation layer is designated as b.The ratio of a to b is controlled within a range of 3.5 to 12, ensuring that both the thermal insulation layer and the adhesive layer occupy a specific proportion of the cylindrical battery's length. This arrangement ensures reliable attachment of the cylindrical battery to the base plate while simultaneously reducing heat exchange between the battery and the base plate. This increases the battery pack's range and lifespan.

[0012] A second aspect of the present application provides a power-consuming device comprising a battery pack according to one of the above solutions.

[0013] The power-consuming device of the present application has the above battery pack, so that it exhibits all the technical effects of the above battery pack, which will not be repeated here. Images

[0014] To more clearly illustrate the technical solutions of the embodiments of the present application or in the prior art, the accompanying drawings, which are to be used in the embodiments of the present application or in the prior art, are briefly described below. Of course, the accompanying drawings described below are some of the embodiments of the present utility model, and other accompanying drawings can be derived from the accompanying drawings by a person with normal technical knowledge without any creative effort. Fig. Figure 1 shows a schematic representation of the structure of a battery box in an embodiment of the present application; Fig. Figure 2 shows a top view of the battery box in an embodiment of the present application; Fig. 3 is a sectional view of Fig. 2 along line AA; Fig. Figure 4 shows a partially enlarged representation of A in Fig. 3; Fig. Figure 5 shows a top view of a battery pack without any part of the cylindrical batteries in an embodiment of the present application; Fig. 6 is a sectional view of Fig. 5 along line BB; Fig. Figure 7 shows a schematic representation of the structure of the battery pack without part of the cylindrical batteries in an embodiment of the present application; Fig. Figure 8 shows a partial sectional view of the battery pack in an embodiment of the present application; Reference symbol list:

[0015] 100-Battery box; 101-Battery mounting area; 1011-Adhesive area; 1012-Thermal insulation area; 102-Base plate; 103-Separation plate; 104-Thermal insulation layer; 105-Adhesive layer; 106-Support separating element; 200-cylinder battery; 300-conductive element; 400 heat exchanger element; 500- Temperature sensing device. Description of embodiments

[0016] The embodiment of the present application discloses a battery pack which improves the secure fastening of cylindrical batteries while maintaining thermal insulation performance.

[0017] The embodiment of the present application further discloses a power-consuming device comprising the above battery pack.

[0018] The exemplary embodiments are described below with reference to the accompanying drawings. Furthermore, the exemplary embodiments shown below do not in any way limit the scope of the accompanying claims. Moreover, the configurations described in the exemplary embodiments shown below are not limited to being essential for the solutions claimed in the accompanying claims. It should be noted that, for the sake of clarity, the drawings show only those parts relevant to the subject matter of this application. The exemplary embodiments of this application and the features in the exemplary embodiments can be combined without conflict.

[0019] In low-temperature environments, the viscosity of the electrolyte solution in lithium-ion batteries increases, slowing the diffusion rate of lithium ions within the electrode materials and increasing the battery's internal resistance. This reduces the battery's charging and discharging efficiency and lowers its capacity. For example, in cold winter regions, the range of electric vehicles can decrease by 20% to 50% compared to normal temperature conditions. However, thermal insulation for lithium batteries can effectively mitigate the increase in electrolyte viscosity, maintain the lithium-ion diffusion rate, and reduce the battery's internal resistance. This improves charging and discharging efficiency, increases the battery's usable capacity, and extends the driving range.

[0020] It should be noted that capacity reduction occurs in all batteries used in low-temperature environments, not just electric vehicles. Applications also extend to electric boats, aircraft, energy storage devices, and similar contexts. For the sake of completeness, electric vehicle batteries will be used as an example below.

[0021] To increase the range in low-temperature environments, a thermal insulation layer is typically applied to the base plate of the battery box. This minimizes heat loss, increases the range, and reduces energy consumption for heating. During operation, electric vehicles are subject to various dynamic processes such as vibrations, shocks, acceleration, and deceleration. Therefore, the cylindrical batteries must be bonded to the base plate of the battery box with adhesive. This ensures their stable positioning within the battery box and prevents collisions, displacement, or loosening of the cylindrical batteries due to vehicle movements. This prevents damage to the electrical connection components between the cylindrical batteries from vibrations and ensures the stability of the battery system's electrical connections.For example, the stable positioning of cylinder banks prevents faults such as internal short circuits during sudden braking or acceleration of a vehicle.

[0022] However, if a thermal insulation layer is applied to the base plate, the cylindrical batteries can only be connected using this soft insulation layer, which is then glued to the base plate. Due to their structural properties, cylindrical batteries tend to roll. Gluing them to a soft insulation layer inevitably compromises their stability within the battery housing.

[0023] In light of this, the embodiment of the present application discloses a battery pack that improves the secure fastening of cylindrical batteries while maintaining thermal insulation performance.

[0024] As in the Fig. 1 and Fig. As shown in Figure 2, the battery pack of the embodiment of the present application comprises a base plate 102 and a cylindrical battery group provided on the base plate 102. The cylindrical battery group comprises a plurality of cylindrical batteries 200, the axial direction of the cylindrical batteries 200 being parallel to the base plate 102. That is to say, in this embodiment, the cylindrical batteries 200 are arranged lying on the base plate 102. The base plate 102 supports the cylindrical batteries 200 and can be made of metallic materials such as aluminum, iron, stainless steel, or an aluminum alloy. It should be noted that, depending on practical requirements, those skilled in the art can select alternative materials for the base plate 102, without being limited to the materials listed above.

[0025] For better understanding, the area on the base plate 102 in which the cylindrical battery group is arranged is defined as a battery receiving area 101. The stacking direction of the plurality of cylindrical batteries 200 within the cylindrical battery group can be perpendicular to the axial direction of the cylindrical battery 200.

[0026] The base plate 102 includes at least one battery mounting area 101 for receiving the cylindrical battery 200 (as shown in the Fig. 5 and Fig. (Figure 7). Experts can configure the battery box 100 to accommodate battery packs with correspondingly different capacities. If the battery box 100 has a substantial volume capable of accommodating a large number of cylindrical batteries 200, it can be divided into several battery mounting areas 101 to optimize thermal management and improve the structural rigidity of the battery box 100. A corresponding number of cylindrical batteries 200 can be mounted in each battery mounting area 101 as required. The partition plate can be formed as a single unit with the battery box 100; alternatively, the partition plate can be welded to the battery box 100 or detachably fastened to it by means of fasteners. This embodiment does not impose any restrictions on the connection method between the partition plate and the battery box 100.

[0027] As in the Fig. 1 and Fig. As shown in Figure 2, a thermal insulation layer 104 and an adhesive layer 105 are provided between at least one of the cylindrical batteries 200 and the base plate 102. The thermal insulation layer 104 and the adhesive layer 105 are arranged along the axial direction of the cylindrical battery 200. The adhesive layer 105 serves to attach the cylindrical battery 200 to the base plate 102. The adhesive layer 105 can be made of materials such as polyurethane structural adhesive, acrylic structural adhesive, or epoxy structural adhesive. The thermal insulation layer 104 provides thermal insulation to minimize heat exchange between the cylindrical battery 200 and the external environment. The thermal conductivity of the thermal insulation layer 104 can be in the range of 0.01 W / (m·K) to 0.3 W / (m·K), and materials such as polyurethane foam, silicone foam, aerogel felt, and the like can be used.This embodiment does not impose any special restrictions regarding the materials of the adhesive layer 105 or the thermal insulation layer 104, provided that they meet the functional requirements.

[0028] Given the fluidity of the adhesive layer 105 during coating, partial overlap between the adhesive layer 105 and the thermal insulation layer 104 cannot be ruled out. If an overlap occurs, the adhesive layer 105 can be located either on the top or bottom surface of the thermal insulation layer 104. Naturally, the adhesive layer 105 can also be present on both the top and bottom surfaces of the thermal insulation layer 104. The embodiment of the present application neither restricts whether the thermal insulation layer 104 and the adhesive layer 105 overlap, nor does it restrict their relative vertical positioning should an overlap occur.

[0029] As in the Fig. 6 and Fig. Figure 7 shows that when the cylindrical battery 200 is in an installed state, part of the cylindrical battery 200 is in contact with the thermal insulation layer 104, while another part is in contact with the adhesive layer 105. Along the axial direction of the cylindrical battery 200, the length of the orthogonal projection of the cylindrical battery 200 onto the base plate 102, which overlaps with the thermal insulation layer 104, is denoted as a, while the length that overlaps with the adhesive layer 105 but not with the thermal insulation layer 104 is denoted as b. The length of the cylindrical battery 200 refers to the dimension in the axial direction of the cylindrical battery 200. Then a / b ≤ 3.5 ≤ a / b ≤ 12. It should be noted that a and b must be chosen in the same unit. a / b can be 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, 10.0, 10.5, 11.0, 11.5, 12.0, etc.

[0030] Experts will recognize that a larger a / b ratio increases the overlap length between the cylindrical battery 200 and the thermal insulation layer 104 while simultaneously decreasing the overlap length with the adhesive layer 105, thereby improving the thermal insulation performance of the cylindrical battery 200. When a / b is smaller, the overlap length between the cylindrical battery 200 and the thermal insulation layer 104 is shorter, while the overlap length with the adhesive layer 105 is longer. This allows the cylindrical battery 200 to achieve better adhesion and fastening performance. In the embodiments of the present application, a / b is between 3.5 and 12, achieving optimal thermal insulation while simultaneously meeting the requirements for bonding and fastening.In summary, the battery pack of the present application comprises a base plate 102 and a cylindrical battery group provided on the base plate 102, wherein a thermal insulation layer 104 and an adhesive layer 105 are provided between at least one of the cylindrical batteries 200 and the base plate 102. In this way, the thermal insulation layer 104 cannot be applied over the entire base plate 102, thus reserving an adhesive area 1011 for coating the base plate 102 with the adhesive layer 105. Part of the cylindrical battery 200 is arranged on the thermal insulation layer 104, while another part is bonded and fastened via the adhesive layer 105. In the orthogonal projection of the cylindrical battery 200 onto the base plate 102, the length that overlaps with the thermal insulation layer 104 is designated as a, while the length that overlaps with the adhesive layer 105 but not with the thermal insulation layer 104 is designated as b.The ratio of a to b is controlled in the range of 3.5 to 12, ensuring that both the thermal insulation layer 104 and the adhesive layer 105 occupy a specific proportion of the length of the cylindrical battery 200. This arrangement ensures reliable attachment of the cylindrical battery 200 to the base plate 102 and simultaneously reduces heat exchange between the cylindrical battery 200 and the base plate 102. This increases the range and service life of the battery pack.

[0031] In a specific embodiment of the present application, the length a of the orthogonal projection of the cylindrical battery 200 onto the base plate 102, which overlaps with the thermal insulation layer 104, can be 75 mm to 120 mm, for example 75 mm, 80 mm, 85 mm, 90 mm, 95 mm, 100 mm, 105 mm, 110 mm, 115 mm, 120 mm, etc.

[0032] The length of the orthogonal projection of the cylindrical battery 200 onto the base plate 102, which overlaps with the adhesive layer 105 but not with the thermal insulation layer 104, is 10 mm to 75 mm, for example 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 75 mm etc.

[0033] It should be noted that a and b are influenced by the length of the 200 mm cylinder battery. For 200 mm cylinder batteries with different dimensions, the values ​​of a and b can vary considerably. Experts can select the appropriate values ​​for a and b based on the dimensions of the 200 mm cylinder battery.

[0034] As in the Fig. As shown in Figures 2 to 4, in a specific embodiment, an adhesive area 1011 is provided on both sides of the thermal insulation area 1012 in at least one battery receiving area 101. This means that the adhesive layer 105 is provided on both sides of the thermal insulation layer 104. It should be noted that the adhesive layer 105 can optionally be provided on only one side of the thermal insulation layer 104. If the battery housing 100 comprises a plurality of battery receiving areas 101, the arrangement of the adhesive area 1011 and the thermal insulation area 1012 within each battery receiving area 101 can be identical or different.Alternatively, the arrangement of the adhesive areas 1011 and the thermal insulation areas 1012 within at least one part of the battery receiving areas 101 can be identical, while the arrangement of the adhesive areas 1011 and the thermal insulation areas 1012 within at least one part of the battery receiving areas 101 can be different.

[0035] If the adhesive area 1011 is provided on both sides of the thermal insulation area 1012 within the battery receiving area 101, i.e., if the adhesive layers 105 are provided on both sides of the thermal insulation layer 104 within the battery receiving area 101, the adhesive layer 105 on one side of the thermal insulation layer 104 is used to fasten one end of the cylindrical battery 200, while the adhesive layer 105 on the other side of the thermal insulation layer 104 fastens the other end of the cylindrical battery 200. In this embodiment, the adhesive layers 105 on both sides of the thermal insulation layer 104 each fasten the two ends of the cylindrical battery 200, while the thermal insulation layer 104 provides thermal insulation for the central part of the cylindrical battery 200.

[0036] In the structure of the battery box 100 disclosed in the above embodiment, an adhesive area 1011 can be provided on both sides of the thermal insulation area 1012 (i.e., the adhesive layer 105 is provided on both sides of the thermal insulation layer 104) if the space within the battery receiving area 101 is limited, such that only a single row of cylindrical batteries 200 can be accommodated in the battery receiving area 101. When the cylindrical batteries 200 are arranged in the battery receiving area 101, the adhesive layer 105 is provided on both sides of the thermal insulation layer 104 to secure both ends of the cylindrical batteries 200. This secures both ends of the cylindrical batteries 200 to the base plate 102 via the adhesive layer 105, resulting in excellent fastening performance of the cylindrical batteries 200.

[0037] In another specific embodiment, both sides of the thermal insulation area 1012 within the battery receiving area 101 are provided with an adhesive area 1011. In other words, if the adhesive layer 105 is provided on both sides of the thermal insulation layer 104 within the battery receiving area 101, the adhesive layer 105 on one side of the thermal insulation layer 104 secures one cylindrical battery 200, while the adhesive layer 105 on the other side of the thermal insulation layer 104 secures another cylindrical battery 200. Thus, in this embodiment, the adhesive layers 105 on both sides of the thermal insulation layer 104 are used to secure two cylindrical batteries 200 each, while the two cylindrical batteries 200 / two rows of cylindrical batteries 200 share a single thermal insulation layer 104.

[0038] For better understanding, the two cylindrical batteries 200, which are attached to both sides of the thermal insulation layer 104 by the adhesive layers 105, are referred to as a first cylindrical battery and a second cylindrical battery, respectively. The adhesive layer 105 corresponding to the first cylindrical battery is referred to as the first adhesive layer, while the adhesive layer 105 corresponding to the second cylindrical battery is referred to as the second adhesive layer.

[0039] Part of the first cylindrical battery is glued and secured by the first adhesive layer, while another part is located on the thermal insulation layer 104 of the thermal insulation area 1012. Similarly, part of the second cylindrical battery is glued and secured by the second adhesive layer, while another part is located on the thermal insulation layer 104 of the thermal insulation area 1012.

[0040] In the structure of the battery pack disclosed in the above embodiment, the adhesive area 1011 can be provided on both sides of the thermal insulation area 1012 if the space in the battery receiving area 101 is sufficient to accommodate two columns of cylindrical batteries 200 in the battery receiving area 101 (as shown in Fig. Figure 7 shows that a battery receiving area 101 can accommodate two columns of cylindrical batteries 200. When two columns of cylindrical batteries 200 are arranged within the battery receiving area 101, the adhesive layer 105 of the adhesive area 1011 on both sides of the thermal insulation area 1012 can each secure a portion of the corresponding columns of cylindrical batteries 200; while the other portions can be attached to the thermal insulation layer 104. This arrangement provides the cylindrical batteries 200 with a larger thermal insulation surface, resulting in excellent thermal insulation performance.

[0041] In a specific embodiment of the present application, the adhesive area 1011 can be provided only on one side of the thermal insulation area 1012 within at least one battery receiving area 101. That is, in this embodiment, the battery receiving area 101 can only receive a single row of cylindrical batteries 200. Part of the cylindrical battery 200 is bonded and secured by the adhesive layer 105 of the adhesive area 1011, while another part is located on the thermal insulation layer 104 of the thermal insulation area 1012.

[0042] Depending on the design requirements, experts can choose whether a battery mounting area 101 should accommodate only a single row of cylindrical batteries 200, or whether the adhesive area 1011 should be provided only on one side of the thermal insulation area 1012. Of course, it is also possible for the adhesive area 1011 to be provided on both sides of the thermal insulation area 1012. In both arrangements, the length of the adhesive area 1011 (i.e., the axial dimension of the cylindrical batteries 200) remains identical. If the adhesive area 1011 is provided only on one side of the thermal insulation area 1012, the thermal insulation area 1012 gains a larger surface area. This gives the cylindrical battery 200 a larger thermal insulation surface, resulting in improved thermal insulation performance.If the adhesive area 1011 is provided on both sides of the thermal insulation area 1012, the adhesive area 1011 has a larger surface area, thus providing the cylinder battery 200 with a larger fastening surface, resulting in a better fastening. At the same time, improved fastening performance is also achieved by bonding and fastening both ends of the cylinder battery 200.

[0043] Experts can select the arrangement of the thermal insulation layer 104 and the adhesive layer 105 based on the fastening and thermal insulation requirements, particularly if a battery receiving area 101 can only accommodate one row of cylindrical batteries 200. The arrangement of the thermal insulation layer 104 and the adhesive layer 105 includes, among other things: the placement of the adhesive layer 105 on one or both sides of the thermal insulation layer 104; the length ratio between the thermal insulation layer 104 and the adhesive layer 105; the presence of overlapping areas between the adhesive layer 105 and the thermal insulation layer 104; and the presence of gaps between the adhesive layer 105 and the thermal insulation layer 104.

[0044] In a specific embodiment of the present application, within at least one battery receiving area 101, the adhesive layer 105, which corresponds to at least two adjacent cylindrical batteries 200, is a one-piece adhesive layer. A one-piece adhesive layer is an adhesive layer 105 that corresponds to several cylindrical batteries 200 and is uniformly coated, whereby the adhesive layers 105 corresponding to each cylindrical battery 200 are joined to form a one-piece structure.

[0045] For example, along the stacking direction of the cylindrical batteries 200 within the battery receiving area 101, the adhesive layer 105 can be formed as a single adhesive layer on the same side as the thermal insulation layer 104. This involves the uniform coating of the adhesive layer on one side of the thermal insulation layer 104, thereby bonding all adhesive layers on at least one side of the thermal insulation layer 104 to form a single adhesive layer. For example, the adhesive layer can be formed as a single adhesive layer only on the first side or the second side of the thermal insulation layer 104, or alternatively, the adhesive layers on both sides of the thermal insulation layer 104 can each be formed as a single adhesive layer.

[0046] Of course, the adhesive layer 105 on the same side as the thermal insulation layer 104 can also be divided into a multitude of single-piece adhesive layers according to areas. That is, the adhesive layer 105 on the same side as the thermal insulation layer 104 is divided into a multitude of areas, with the adhesive layer corresponding to each area being formed as a single-piece structure, thus creating a gap between the adhesive layers 105 of adjacent areas.

[0047] When the adhesive layers 105, corresponding to at least two cylinder batteries 200, are joined together to form a single adhesive layer, a more uniform force distribution is ensured across the individual cylinder batteries 200 that are bonded and secured by this single adhesive layer. The uniformly coated, single adhesive layer enables a uniform force distribution between the individual cylinder batteries 200. During operation of the battery pack, various external forces such as vibrations and shocks act upon it. If the adhesive layer 105 is applied individually to each cylinder battery 200, the coating of the adhesive layer 105 corresponding to each cylinder battery 200 becomes uneven. This results in stronger adhesion on some cylinder batteries 200 and insufficient adhesion on others.For the 200 cylinder batteries, insufficient adhesive strength can cause the adhesive to loosen or even separate under load, which impairs the performance and safety of the battery pack.

[0048] When a large number of 200 cylindrical batteries are uniformly coated with an adhesive layer, the adhesive layer 105 has a larger surface area, allowing for a more uniform thickness. This uniform, one-piece adhesive layer distributes external forces evenly across each 200 cylindrical battery, ensuring the structural stability of the entire battery pack and reducing the risk of connection failure due to localized excessive stress.

[0049] When the adhesive layer 105, corresponding to at least two cylinder batteries 200, is bonded into a single adhesive layer, a uniform coating process and uniform parameters can be used, enabling automated production processes. Automated systems operate according to preset standards and perform the adhesive coating process for each cylinder battery 200 quickly and precisely. This significantly increases production efficiency and reduces costs compared to a manual, random coating process.

[0050] During production, a uniform adhesive coating facilitates strict process control and ensures that the adhesive layer of each 200-cell battery meets standard requirements. This minimizes product quality issues due to variations in the adhesive layer. This is crucial for high-quality battery products in mass production and contributes to improved product yield.

[0051] It should be noted that each cylinder battery 200 may have an independent adhesive layer 105, or alternatively, several cylinder batteries 200 may have independent adhesive layers 105, or some cylinder batteries 200 may have a uniform, one-piece adhesive layer. The specific arrangement of the adhesive layer 105 can be designed by those skilled in the art according to the product requirements; this embodiment does not restrict the arrangement of the adhesive layer 105.

[0052] In a specific embodiment of the present application, within at least one battery receiving area 101, the thermal insulation layer 104, corresponding to at least two adjacent cylindrical batteries 200, is a single thermal insulation layer. In this embodiment, within the battery receiving area 101, a plurality of adjacent cylindrical batteries 200 can share a single thermal insulation layer 104 along the arrangement direction of the cylindrical batteries 200. For example, within the battery receiving area 101 along the arrangement direction of the cylindrical batteries 200, the thermal insulation layer 104 corresponding to a series of cylindrical batteries 200 can be the same thermal insulation layer. That is, the thermal insulation layers 104 corresponding to each cylindrical battery 200 in this series are connected to each other to form a single thermal insulation layer.Naturally, the thermal insulation layer 104, corresponding to a series of cylindrical batteries 200, can be subdivided into several single-piece thermal insulation layers along the arrangement direction of the cylindrical batteries 200, according to regions. That is, the thermal insulation layer 104, corresponding to a series of cylindrical batteries 200, can be subdivided into several regions along the arrangement direction of this series of cylindrical batteries 200. The thermal insulation layers 104 corresponding to each region are formed as a single-piece structure, with gaps formed between the thermal insulation layers 104 of adjacent regions.

[0053] When installing the thermal insulation layer 104, this layer has a large surface area, allowing it to fit multiple 200-cylinder batteries simultaneously. This simplifies handling and significantly reduces both labor and installation time. It is not necessary to apply the thermal insulation layer 104 individually to each 200-cylinder battery, thus saving labor costs and installation time. In large battery production lines, this significantly improves production efficiency and reduces overall production costs.

[0054] When multiple cylindrical batteries 200 use the same thermal insulation layer 104, potential thermal anomalies between the cylindrical batteries 200, which can arise from the independent arrangement of multiple thermal insulation layers 104 and their subsequent connection, are effectively mitigated. Abnormal heat transfer can occur at these connection points, impairing the thermal insulation effect. A uniform thermal insulation layer 104 minimizes excessive connection gaps and enables a more uniform heat distribution within the battery pack. This results in more stable and efficient overall thermal performance.

[0055] By using a single thermal insulation layer 104 for a series of cylindrical batteries 200, a uniform thermal environment is created for this series of cylindrical batteries 200. During battery operation, the heat generated by the cylindrical batteries 200 can be better regulated in this relatively enclosed and uniform space. This prevents local overheating or undercooling caused by differences between the individual thermal insulation layers 104 and thus helps to maintain a uniform temperature throughout the battery pack. Consequently, the battery pack's lifespan is extended and its performance is improved.

[0056] In a specific embodiment of the present application, in which the length of the cylindrical battery 200 L is (a+b) / L lies in the range of 0.6 to 1.0 (where a, b, and L must all be expressed in the same unit, e.g., mm), and can be, for example, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95, 1.0, etc. The cylindrical battery 200 comprises a battery housing and an electrical core provided in the battery housing. The battery housing comprises two opposing end faces and an outer side face arranged between the two end faces. At least one end face is provided with an electrode column assembly, wherein the electrode column assemblies of the two cylindrical batteries 200 are electrically connected to each other via a conductive element 300. The length of the cylindrical battery 200 refers to the distance between the two end faces of the battery housing, i.e. the axial dimension of the cylindrical battery 200.

[0057] In this embodiment, a larger value of (a+b) / L thus signifies a greater overlap length between the thermal insulation layer 104 and the adhesive layer 105 with the cylindrical battery 200. For example, the thermal insulation layer 104 and the adhesive layer 105 can be arranged along only 60% of the length of the cylindrical battery 200 in the axial direction, or the thermal insulation layer 104 and the adhesive layer 105 can cover the entire length. The specific arrangement can be determined based on cost considerations, fastening requirements, and thermal insulation requirements.

[0058] The diameter of the cylindrical battery 200 ranges from 15 mm to 50 mm. For example, the diameter of the cylindrical battery 200 can be 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, etc., such that a / b satisfies the following: 5 ≤ a / b ≤ 12.

[0059] The larger the diameter of the cylindrical battery 200, the larger the contact area between the outer cylindrical surface of the cylindrical battery 200 and the adhesive layer 105, resulting in higher adhesive strength. Consequently, it is not necessary to increase the length of the adhesive layer 105 to achieve higher adhesive strength.

[0060] To ensure adequate thermal insulation performance in this case, the value of a can be increased. This requires extending the overlap length of the orthogonal projection of the cylindrical battery 200 onto the base plate 102 with the thermal insulation layer 104. Consequently, a larger area of ​​the cylindrical battery 200 is covered by the thermal insulation layer 104, thus improving the thermal insulation effect.

[0061] If the diameter of the cylindrical battery 200 is small, the contact area between the outer cylindrical surface of the battery 200 and the adhesive layer 105 decreases, resulting in lower adhesive strength. In this case, the value of b must be increased to achieve greater adhesive strength. This is achieved by increasing the overlap length of the orthogonal projection of the cylindrical battery 200 onto the base plate 102 with the thermal insulation layer 104. Conversely, the value of a can be decreased. This reduces the overlap length of the orthogonal projection of the cylindrical battery 200 onto the base plate 102 with the thermal insulation layer 104. Consequently, a larger area of ​​the cylindrical battery 200 is covered by the adhesive layer 105, thus ensuring effective fastening of the cylindrical battery 200.

[0062] As in Fig. As shown in Figure 7, at least one end of the cylindrical battery 200 is connected to a conductive element 300, wherein the projection of an electrical connection end of the cylindrical battery 200 is spaced apart from the projection of the thermal insulation layer 104 on the base plate 102. The electrical connection end of the cylindrical battery 200 refers to the end at which the cylindrical battery 200 is connected to the conductive element 300.

[0063] The end face of the cylindrical battery 200, which is equipped with an electrode column assembly, serves as an electrical connection end. The electrode column assemblies of the two cylindrical batteries 200 are electrically connected to each other via the conductive element 300. The electrode column assembly typically comprises a positive electrode column assembly and a negative electrode column assembly. When two cylindrical batteries 200 are connected in series, the conductive element 300 must be electrically connected to the positive electrode column assembly of one cylindrical battery 200 and the negative electrode column assembly of the other cylindrical battery 200. When two cylindrical batteries 200 are connected in parallel, the conductive element 300 must be electrically connected to the electrode column assemblies of the two cylindrical batteries 200 that have the same polarity.

[0064] In this embodiment, the projection of the electrical connection end of the cylindrical battery 200 is spaced apart from the projection of the thermal insulation layer 104 on the base plate 102, with the adhesive layer 105 being provided at the end of the cylindrical battery 200 that has the conductive element 300. The conductive element 300 is typically arranged at the edge region of the battery housing, where the heat dissipation conditions are favorable. By arranging the adhesive layer 105 at the end of the cylindrical battery 200 that has the conductive element 300, the effect of the high heat generation of the conductive element 300 is reduced compared to arranging the thermal insulation layer 104 at the end of the cylindrical battery 200 that has the conductive element 300. This prevents the thermal insulation layer 104 from impeding heat dissipation in the area where the conductive element 300 is located.

[0065] Both ends of the cylindrical battery (200) can be connected to the conductive element (300), where a / b satisfies the following: 3.5 ≤ a / b ≤ 9.0. In this embodiment, reducing the upper limit of the value of a / b allows b to have a larger value. This ensures that the length of the orthogonal projection of the cylindrical battery 200 onto the base plate 102, which overlaps with the adhesive layer 105 and not with the thermal insulation layer 104, is increased. In this way, a better adhesive and fastening effect is achieved.

[0066] In a specific embodiment of the present application, an insulating layer is provided on the surface of the cylindrical battery 200. The adhesive strength between the insulating layer and the adhesive layer 105 is not optimal, and the insulating layer exhibits certain thermal insulation properties. Therefore, if an insulating layer is provided on the surface of the cylindrical battery 200, the length a of the orthogonal projection of the cylindrical battery 200 onto the base plate 102, which overlaps with the thermal insulation layer 104, can be reduced, while the length b of the orthogonal projection of the cylindrical battery onto the base plate, which overlaps with the adhesive layer 105 and not with the thermal insulation layer 104, can be increased.

[0067] As in Fig. As shown in Figure 7, if a conductive element 300 is provided at one end of the cylindrical battery 200, a heat exchange element 400 can be provided at the other end. The heat exchange element 400 facilitates heat dissipation from the cylindrical battery 200 at the end of the cylindrical battery 200 facing away from the conductive element 300, thereby reducing the temperature of the cylindrical battery 200.

[0068] Batteries can experience thermal runaway under certain conditions such as overcharging, over-discharging, short circuits, or exposure to high temperatures, which can lead to fires or explosions. Real-time temperature monitoring enables the timely activation of protective mechanisms such as circuit interruption or cooling system activation. Unusual temperature increases can indicate internal faults (e.g., short circuits, aging), so battery health monitoring provides early warning to prevent incidents. Furthermore, battery thermal management requires monitoring the battery temperature. Based on the temperature data, the cooling system or heating device is activated to keep the battery within its optimal operating temperature range.

[0069] As in the Fig. 7 and Fig.As shown in Figure 8, in this embodiment a temperature sensing device 500 is provided on the outer side surface of the battery housing of at least one cylindrical battery 200. The specific cylindrical batteries 200 within the battery pack that must be equipped with a temperature sensing device 500 can be selected by those skilled in the art according to the requirements. To reflect the temperature conditions of the battery pack, several temperature sensing devices 500 can be provided, distributed as widely as possible to avoid a concentration of individual temperature sensing devices 500 in a small area. The temperature sensing device 500 can be an NTC thermistor (Negative Temperature Coefficient) or another temperature measuring device capable of measuring the temperature of the cylindrical battery 200. This embodiment does not restrict the specific type of temperature sensing device 500.

[0070] The temperature sensing device 500 can be attached to the outer side surface of the cylindrical battery 200 by gluing. The adhesive used for gluing the temperature sensing device 500 can be a thermally conductive structural adhesive or another suitable adhesive that allows the temperature sensing device 500 to be securely bonded and fastened. Of course, alternative fastening methods can also be used to attach the temperature sensing device 500 to the outer side surface of the cylindrical battery 200.

[0071] The battery pack disclosed in the embodiments of the present application can be provided with one layer of cylindrical batteries 200 or several layers of cylindrical batteries 200. If several layers of cylindrical batteries 200 are provided, the lowest layer of cylindrical batteries 200 can be arranged on the base plate 102, with the cylindrical batteries 200 of the other layers stacked upwards in a direction perpendicular to the base plate 102. Support separators 106 are provided between adjacent layers of cylindrical batteries 200. These support separators 106 separate the adjacent layers of cylindrical batteries 200 from one another and simultaneously support the upper layer of cylindrical batteries 200.

[0072] The support separating element 106 can be a corrugated plate, i.e., the support separating element 106 has intermittent and continuous upwardly curved surface grooves and downwardly curved surface grooves. The cylinder batteries 200 below the support separating element 106 are arranged consecutively within the downwardly curved surface grooves of the support separating element 106, while the cylinder batteries 200 above the support separating element 106 are arranged consecutively within the upwardly curved surface grooves of the support separating element 106.

[0073] The embodiments of the present application also disclose a power-consuming device comprising the battery pack disclosed in the embodiments above. Such power-consuming devices may include electric vehicles, electric boats, aircraft, energy storage devices, and the like. The power-consuming device disclosed by the embodiments of the present application has the battery pack mentioned above, so that it exhibits all the technical effects of the battery pack mentioned above, which will not be repeated here.

[0074] As stated in the present application and in the claims, words such as "a," "a kind," and / or "these" do not specifically refer to the singular but may also include the plural unless the context clearly indicates an exception. In general, the terms "including" and "comprising" only indicate the inclusion of clearly identified steps and elements, which do not constitute an exclusive list, and the process or apparatus may also include other steps or elements. The fact that an element is defined by the phrase "with a ..." does not preclude the presence of another identical element in the process, method, subject matter, or apparatus that includes that element.

[0075] Unless expressly stated otherwise, in the description of the present application the words “provided”, “assembled”, “connected”, etc. are to be understood broadly, and technical personnel in the field of technology may appropriately determine the specific meaning of the above words in the present application in conjunction with the specific content of the technical solutions.

[0076] Each embodiment in this description is described step by step, and each embodiment focuses on the differences from other embodiments, and it is sufficient to refer to each embodiment for identical and similar parts of each embodiment.

[0077] Specific examples are used in this description to illustrate the principles and implementation methods of the present application. The above description of the exemplary embodiments serves solely to facilitate understanding of the methods and core concepts of the present application. It should be noted that, for a person with ordinary expertise in the field, a number of improvements and embellishments can be made without derogation from the principles of the present application, and these improvements and embellishments should also be considered within the scope of protection afforded by the present application.

[0078] The present application discloses a battery pack and a power-consuming device comprising a base plate and a cylindrical battery group provided on the base plate, the cylindrical battery group comprising a plurality of cylindrical batteries, the axial direction of the cylindrical batteries being parallel to the base plate; wherein a thermal insulation layer and an adhesive layer are provided between at least one of the cylindrical batteries and the base plate, the thermal insulation layer and the adhesive layer being distributed along the axial direction of the cylindrical batteries; wherein, along the axial direction of the cylindrical batteries, the length of the orthogonal projection of the cylindrical battery onto the base plate that overlaps with the thermal insulation layer is designated as a, while the length that overlaps with the adhesive layer but not with the thermal insulation layer is designated as b, wherein the ratio a / b satisfies the following: 3.5 ≤ a / b ≤ 12.In the present application, the ratio of a to b is controlled in the range of 3.5 to 12, ensuring that both the thermal insulation layer and the adhesive layer occupy a specific proportion of the length of the cylindrical battery. This arrangement ensures reliable attachment of the cylindrical battery to the base plate while simultaneously reducing heat exchange between the cylindrical battery and the base plate. This increases the range and service life of the battery pack.

Claims

[1] Battery pack, characterized by , that it comprises a base plate (102) and a cylindrical battery group provided on the base plate (102), wherein the cylindrical battery group comprises a plurality of cylindrical batteries (200), wherein the axial direction of the cylindrical batteries (200) is parallel to the base plate (102); wherein a thermal insulation layer (104) and an adhesive layer (105) are provided between at least one of the cylinder batteries (200) and the base plate (102), wherein the thermal insulation layer (104) and the adhesive layer (105) are distributed along the axial direction of the cylinder batteries (200); wherein, along the axial direction of the cylindrical batteries (200), the length of the orthogonal projection of the cylindrical battery (200) onto the base plate (102) which overlaps with the thermal insulation layer (104) is referred to as a, while the length which overlaps with the adhesive layer (105) but not with the thermal insulation layer (104) is referred to as b, wherein the ratio a / b satisfies the following: 3.5 ≤ a / b ≤ 12. [2] Battery pack according to claim 1, characterized by , that at least one battery receiving area (101) for receiving the cylindrical batteries (200) is formed on the base plate (102), wherein the adhesive layer (105) is provided on both sides of the thermal insulation layer (104) within at least one battery receiving area (101). [3] Battery pack according to claim 2, characterized by, that when the adhesive layer (105) is provided on both sides of the thermal insulation layer (104) within the battery receiving area (101), the adhesive layer (105) on one side of the thermal insulation layer (104) serves to secure one end of the cylindrical battery (200); wherein the adhesive layer (105) on the other side of the thermal insulation layer (104) serves to secure the other end of the cylindrical battery (200). [4] Battery pack according to claim 2, characterized by , that when the adhesive layer (105) is provided on both sides of the thermal insulation layer (104) within the battery receiving area (101), the adhesive layer (105) on one side of the thermal insulation layer (104) serves to secure a cylindrical battery (200); wherein the adhesive layer (105) on the other side of the thermal insulation layer (104) serves to secure another cylindrical battery (200). [5] Battery pack according to claim 1, characterized by, that at least one battery receiving area (101) for receiving the cylindrical batteries (200) is formed on the base plate (102), wherein the adhesive layer (105) is provided on one side of the thermal insulation layer (104) within at least one battery receiving area (101). [6] Battery pack according to any one of claims 1 to 5, characterized by , that at least one battery receiving area (101) for receiving the cylindrical batteries (200) is formed on the base plate (102), wherein within at least one battery receiving area (101) the adhesive layer (105), which corresponds to at least two adjacent cylindrical batteries (200), is a one-piece adhesive layer. [7] Battery pack according to any one of claims 1 to 5, characterized by, that at least one battery receiving area (101) for receiving the cylindrical batteries (200) is formed on the base plate (102), wherein within at least one battery receiving area (101) the thermal insulation layer (104), which corresponds to at least two adjacent cylindrical batteries (200), is a one-piece thermal insulation layer. [8] Battery pack according to any one of claims 1 to 5, characterized by , that the length of the cylinder battery is (200) L, where (a+b) / L lies in a range of 0.6 to 1.0, [9] Battery pack according to any one of claims 1 to 5, characterized by , that the diameter of the cylindrical battery (200) is in the range of 15 mm to 50 mm, where a / b satisfies the following: 5 ≤ a / b ≤ 12. [10] Battery pack according to any one of claims 1 to 5, characterized by, that at least one end of the cylindrical battery (200) is connected to a conductive element (300), wherein the projection of an electrical connection end of the cylindrical battery (200) is spaced apart from the projection of the thermal insulation layer (104) on the base plate (102); wherein the electrical connection end of the cylindrical battery (200) is the end of the cylindrical battery (200) connected to the conductive element (300). [11] Battery pack according to claim 10, characterized by , that the two ends of the cylindrical battery (200) are connected to the conductive element (300), where a / b satisfies the following: 3.5 ≤ a / b ≤ 9.

0. [12] Battery pack according to any one of claims 1 to 5, characterized by , that the length a of the orthogonal projection of the cylindrical battery (200) onto the base plate (102), which overlaps with the thermal insulation layer (104), is 75 mm to 120 mm; and / or that the length b of the orthogonal projection of the cylindrical battery (200) onto the base plate (102), which overlaps with the adhesive layer (105) but not with the thermal insulation layer (104), is 10 mm to 75 mm. [13] Battery pack according to any one of claims 1 to 5, characterized by , that an insulating layer is provided on the surface of the cylindrical battery (200). [14] Power-consuming device, characterized by , that it comprises a battery pack according to any one of claims 1 to 13. [15] Battery pack according to claim 10, characterized by , that along the axial direction of the cylinder battery one end of the cylinder battery (200) is connected to the conductive element (300) and the other end is provided with a heat exchange element (400).

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