Battery pack and electric equipment

Abstract

The utility model discloses a battery pack and electric equipment, the battery pack comprises a bottom plate and a cylindrical battery pack arranged on the bottom plate, the cylindrical battery pack comprises a plurality of cylindrical batteries, and the axial direction of the cylindrical batteries is parallel to the bottom plate; a thermal insulation layer and an adhesive layer are arranged between at least one cylindrical battery and the bottom plate and are distributed along the axial direction of the cylindrical battery; and in the axial direction of the cylindrical battery, the overlapping length of the orthographic projection of the cylindrical battery on the bottom plate and the heat preservation layer is a, the overlapping length of the orthographic projection of the cylindrical battery and the glue layer and the non-overlapping length of the orthographic projection of the cylindrical battery and the heat preservation layer are b, and a / b meets the condition that a / b is larger than or equal to 3.5 and smaller than or equal to 12. According to the application, the ratio of a to b is controlled within the range of 3.5-12, so that both the thermal insulation layer and the adhesive layer account for a certain proportion of the length of the cylindrical battery, the cylindrical battery can be more reliably fixed on the bottom plate, meanwhile, heat exchange between the cylindrical battery and the bottom plate can be reduced, the cruising ability of the battery pack is improved, and the service life of the battery pack is prolonged.

Description

Technical Field

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

[0002] The thermal insulation performance of a battery pack is closely related to its driving range, especially in low-temperature environments. The battery's operating temperature range directly affects its discharge efficiency, capacity retention, and lifespan, thus impacting the driving range of an electric vehicle. By optimizing the thermal insulation design of the battery pack, the lower limit of the battery's low temperature can be lowered, thereby mitigating the negative effects of low temperatures.

[0003] Currently, an insulation layer is typically installed on the base plate of the battery pack to reduce heat loss, extend battery life, and lower heating energy consumption. Cylindrical batteries are usually fixed to the base plate with adhesive to maintain their stability. After the insulation layer is laid on the base plate, the cylindrical batteries are usually fixed to the insulation layer. However, since the insulation layer is a soft material, the adhesion strength between the cylindrical batteries and the insulation layer is relatively low, making them prone to detachment in vibration environments.

[0004] Therefore, how to improve the fixation reliability of cylindrical batteries while ensuring the heat preservation effect is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of this application is to provide a battery pack that improves the fixing reliability of cylindrical batteries while ensuring the heat preservation effect;

[0006] Another object of this application is to provide an electrical device having the above-mentioned battery pack.

[0007] To achieve the above objectives, this application provides the following technical solution:

[0008] The first aspect of this application provides a battery pack, including a base plate and a cylindrical battery pack disposed on the base plate, the cylindrical battery pack including a plurality of cylindrical batteries, the axial direction of the cylindrical batteries being parallel to the base plate;

[0009] At least one of the cylindrical batteries is provided with an insulation layer and an adhesive layer between it and the base plate, and the insulation layer and the adhesive layer are distributed along the axial direction of the cylindrical battery;

[0010] Along the axial direction of the cylindrical battery, the length by which the orthographic projection of the cylindrical battery onto the base plate overlaps with the insulation layer is a, and the length by which it overlaps with the adhesive layer but not with the insulation layer is b. Then a / b satisfies: 3.5≤a / b≤12.

[0011] The battery pack provided in this application has a base plate and cylindrical battery packs disposed on the base plate. At least one cylindrical battery is separated from the base plate by an insulation layer and an adhesive layer. This arrangement ensures that the insulation layer does not completely cover the entire base plate, leaving an area for the adhesive layer. A portion of the cylindrical battery is arranged on the insulation layer, and a portion is fixed by the adhesive layer. In the orthographic projection of the cylindrical battery onto the base plate, the length overlapping with the insulation layer is 'a', and the length overlapping with the adhesive layer but not with the insulation layer is 'b'. The ratio of a to b is controlled within the range of 3.5 to 12, ensuring that both the insulation layer and the adhesive layer occupy a certain proportion of the cylindrical battery length. This allows the cylindrical battery to be more reliably fixed to the base plate while reducing heat exchange between the cylindrical battery and the base plate, thereby improving the battery pack's range and lifespan.

[0012] A second aspect of this application provides an electrical device, characterized in that it includes a battery pack as described in any of the preceding claims.

[0013] The electrical equipment provided in this application has the aforementioned battery pack, and therefore possesses all the technical effects of the aforementioned battery pack, which will not be elaborated upon here. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the battery housing structure disclosed in an embodiment of this application;

[0016] Figure 2 This is a top view of the battery housing disclosed in an embodiment of this application;

[0017] Figure 3 for Figure 2 Sectional view along line AA;

[0018] Figure 4 for Figure 3 A magnified view of part A in the image;

[0019] Figure 5 This is a top view of the battery pack disclosed in the embodiments of this application after removing some of the cylindrical batteries;

[0020] Figure 6 for Figure 5 Sectional view along line BB;

[0021] Figure 7This is a schematic diagram of the battery pack disclosed in this application after removing some of the cylindrical batteries;

[0022] Figure 8 This is a partial cross-sectional view of the battery pack disclosed in an embodiment of this application.

[0023] The meanings of the various reference numerals in the figure are as follows:

[0024] 100-Battery housing; 101-Battery housing area; 1011-Adhesive area; 1012-Insulation area; 102-Base plate; 103-Separator; 104-Insulation layer; 105-Adhesive layer; 106-Supporting partition;

[0025] 200-cylindrical battery;

[0026] 300 - Conductive component;

[0027] 400 - Heat exchanger;

[0028] 500 - Temperature acquisition device. Detailed Implementation

[0029] This application discloses a battery pack that improves the fixing reliability of cylindrical batteries while ensuring heat preservation.

[0030] This application also discloses an electrical device having the above-described battery pack.

[0031] Hereinafter, embodiments will be described with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the application as described in the claims. Additionally, the complete composition represented in the embodiments below is not limited to what is necessary as the solution to the application described in the claims. It should be noted that, for ease of description, only the parts relevant to the application are shown in the drawings. Unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0032] In low-temperature environments, the viscosity of the electrolyte in lithium-ion batteries increases, slowing down the diffusion rate of lithium ions in the electrode materials and increasing the battery's internal resistance. This leads to reduced charge / discharge efficiency and decreased battery capacity. For example, in cold winter regions, the driving range of electric vehicles can decrease by 20% to 50% compared to normal temperatures. Insulating the lithium-ion battery can effectively alleviate the problem of increased electrolyte viscosity, maintain the diffusion rate of lithium ions, reduce internal resistance, thereby improving charge / discharge efficiency, increasing the actual usable capacity, and extending driving range.

[0033] It should be noted that all batteries used in low-temperature environments experience capacity degradation, and this is not limited to electric vehicles. They can also be used in electric ships, aircraft, energy storage devices, and other applications. For ease of understanding, the following discussion will focus on batteries used in electric vehicles.

[0034] Currently, to improve the battery's cruising capability in low-temperature environments, an insulation layer is typically installed on the bottom plate of the battery pack to reduce heat loss, extend driving range, and lower heating energy consumption. Electric vehicles experience various vibrations, bumps, accelerations, and decelerations during operation. Therefore, cylindrical batteries need to be glued to the bottom plate of the battery pack to ensure their stable position within the pack. This prevents collisions, displacement, or loosening of the cylindrical batteries due to vehicle movement, thus preventing damage to the connecting components and ensuring the electrical stability of the battery system. For example, a stable battery position prevents internal short circuits and other malfunctions during sudden braking or acceleration.

[0035] However, when an insulation layer is laid on the base plate, the cylindrical battery can only be bonded to the flexible insulation layer, which is then bonded to the base plate. Due to the structural characteristics of the cylindrical battery, it is easy for it to roll, and being bonded to the soft insulation layer will inevitably affect the stability of the cylindrical battery inside the battery box.

[0036] Based on this, this application discloses a battery pack to improve the fixing reliability of cylindrical batteries while ensuring the heat preservation effect.

[0037] like Figure 1 and Figure 2 As shown in the illustration, the battery pack disclosed in this application includes a base plate 102 and a cylindrical battery pack disposed on the base plate 102. The cylindrical battery pack includes multiple cylindrical batteries 200, and the axial direction of the cylindrical batteries 200 is parallel to the base plate 102. That is, in this embodiment, the cylindrical batteries 200 are disposed on the base plate 102 in a horizontal manner. The base plate 102 is used to support the cylindrical batteries 200, and its material can be a metal material such as aluminum, iron, stainless steel, or aluminum alloy. It should be noted that those skilled in the art can also choose other materials for the base plate 102 according to actual needs, and are not limited to the materials listed above.

[0038] For ease of understanding, the area on the base plate 102 where the cylindrical battery pack is arranged is defined as the battery receiving area 101. The stacking direction of the multiple cylindrical batteries 200 of the cylindrical battery pack can be perpendicular to the axial direction of the cylindrical battery 200.

[0039] At least one cylindrical battery 200 is formed on the base plate 102 (e.g., Figure 5 and Figure 7The battery housing area 101 is shown in the figure. Those skilled in the art can design battery housings 100 of varying sizes according to the different capacities of the battery packs. When the volume of the battery housing 100 is large enough to accommodate multiple cylindrical batteries 200, in order to optimize thermal management and improve the structural strength of the battery housing 100, a separator can be used to divide the battery housing 100 into multiple battery housing areas 101. In each battery housing area 101, a corresponding number of cylindrical batteries 200 can be fixed as needed. The separator can be designed as an integral structure with the battery housing 100, or it can be welded into the battery housing 100 or detachably fixed within the battery housing 100 using fasteners. This embodiment does not limit the connection relationship between the separator and the battery housing 100.

[0040] like Figure 1 and Figure 2 As shown, at least one cylindrical battery 200 is provided with an insulation layer 104 and an adhesive layer 105 between it and the base plate 102. The insulation layer 104 and the adhesive layer 105 are arranged along the axial direction of the cylindrical battery 200. The adhesive layer 105 is used to fix the cylindrical battery 200 to the base plate 102, and the material of the adhesive layer 105 can be polyurethane structural adhesive, acrylic structural adhesive, epoxy structural adhesive, etc. The insulation layer 104 is used to provide heat insulation to reduce heat exchange between the cylindrical battery 200 and the external environment. The thermal conductivity of the insulation layer 104 can be in the range of 0.01 W / (m·K) to 0.3 W / (m·K), and the material can be polyurethane foam, silicone foam, aerogel felt, etc. In this embodiment, the specific materials of the adhesive layer 105 and the insulation layer 104 are not limited, as long as they meet the usage requirements.

[0041] Because the adhesive layer 105 is fluid during application, it is possible that some of the adhesive layer 105 may overlap with the insulation layer 104. When the adhesive layer 105 overlaps with the insulation layer 104, the adhesive layer 105 may be located on the upper side or the lower side of the insulation layer 104; of course, the insulation layer 105 may also be present on both the upper and lower sides of the insulation layer 104. This application embodiment does not limit whether the insulation layer 104 and the adhesive layer 105 overlap, or, if they overlap, their vertical positional relationship.

[0042] like Figure 6 and 7As shown, when the cylindrical battery 200 is in the installed state, a portion of the cylindrical battery 200 is in contact with the insulation layer 104, and a portion is in contact with the adhesive layer 105. Along the axial direction of the cylindrical battery 200, the length by which the orthographic projection of the cylindrical battery 200 onto the base plate 102 overlaps with the insulation layer 104 is 'a', and the length by which it overlaps with the adhesive layer 105 but not with the insulation layer 104 is 'b'. The length of the cylindrical battery 200 refers to its axial dimension. Therefore, a / b satisfies 3.5 ≤ a / b ≤ 12. It should be noted that a and b must be in the same unit. a / b can be selected from 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.

[0043] Those skilled in the art will understand that a larger a / b ratio results in a longer overlap between the cylindrical battery 200 and the insulation layer 104, and a shorter overlap between the cylindrical battery 200 and the adhesive layer 105, thus achieving a better thermal insulation effect for the cylindrical battery 200. Conversely, a smaller a / b ratio results in a shorter overlap between the cylindrical battery 200 and the insulation layer 104, and a longer overlap between the cylindrical battery 200 and the adhesive layer 105, thus achieving a better bonding and fixing effect for the cylindrical battery 200. In this embodiment, a / b is selected between 3.5 and 12, which can achieve a better thermal insulation effect while satisfying the bonding and fixing effect. In summary, the battery pack disclosed in this embodiment has a base plate 102 and a cylindrical battery pack disposed on the base plate 102, and at least one cylindrical battery 200 is provided with an insulation layer 104 and an adhesive layer 105 between it and the base plate 102. This arrangement ensures that the insulation layer 104 does not completely cover the entire base plate 102, leaving an adhesive area 1011 for applying the adhesive layer 105. A portion of the cylindrical battery 200 is positioned on the insulation layer 104, while another portion is bonded and fixed by the adhesive layer 105. In the orthographic projection of the cylindrical battery 200 onto the base plate 102, the length overlapping with the insulation layer 104 is 'a', and the length overlapping with the adhesive layer 105 but not with the insulation layer 104 is 'b'. By controlling the ratio of 'a' to 'b' within the range of 3.5 to 12, both the insulation layer 104 and the adhesive layer 105 occupy a certain proportion of the length of the cylindrical battery 200. This allows the cylindrical battery 200 to be more reliably fixed to the base plate 102 while reducing heat exchange between the cylindrical battery 200 and the base plate 102, thereby improving the battery pack's range and lifespan.

[0044] In a specific embodiment of this application, the length 'a' of the cylindrical battery 200 overlapping with the insulation layer 104 in the orthographic projection of the base plate 102 can be 75mm to 120mm, for example, 75mm, 80mm, 85mm, 90mm, 95mm, 100mm, 105mm, 110mm, 115mm, 120mm, etc.

[0045] In the orthographic projection of the cylindrical battery 200 onto the base plate 102, the length b that overlaps with the adhesive layer 105 but does not overlap with the insulation layer 104 is 10mm to 75mm, for example, it can be 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, etc.

[0046] It should be noted that the values ​​of a and b are affected by the length of the cylindrical battery 200. The values ​​of a and b vary greatly for cylindrical batteries 200 of different sizes. Those skilled in the art can reasonably select the values ​​of a and b according to the size of the cylindrical battery 200.

[0047] like Figures 2-4 As shown, in one specific embodiment, in at least one battery housing area 101, adhesive areas 1011 are provided on both sides of the insulation area 1012, that is, adhesive layers 105 are provided on both sides of the insulation layer 104. It should be noted that adhesive layers 105 may also be provided only on one side of the insulation layer 104. When the battery housing 100 has multiple battery housing areas 101, the arrangement of adhesive areas 1011 and insulation areas 1012 in each battery housing area 101 can be designed to be the same or different, or at least some battery housing areas 101 have the same arrangement of adhesive areas 1011 and insulation areas 1012, and at least some battery housing areas 101 have different arrangement of adhesive areas 1011 and insulation areas 1012.

[0048] When adhesive areas 1011 are provided on both sides of the insulation area 1012 within the battery housing area 101; in other words, when adhesive layers 105 are provided on both sides of the insulation layer 104 within the battery housing area 101, the adhesive layer 105 on one side of the insulation layer 104 is used to fix one end of the cylindrical battery 200, and the adhesive layer 105 on the other side of the insulation layer 104 is used to fix the other end of the cylindrical battery 200. That is, in this embodiment, the adhesive layers 105 on both sides of the insulation layer 104 are used to fix the two ends of the cylindrical battery 200 respectively, while the insulation layer 104 is used to insulate the middle part of the cylindrical battery 200.

[0049] In the battery housing 100 structure disclosed in the above embodiments, when the space of the battery receiving area 101 is small, such that the battery receiving area 101 can only accommodate one row of cylindrical batteries 200, adhesive areas 1011 (i.e., adhesive layers 105 are provided on both sides of the insulation layer 104) can be provided on both sides of the insulation area 1012. When the cylindrical battery 200 is placed in the battery receiving area 101, the adhesive layers 105 on both sides of the insulation layer 104 can fix the two ends of the cylindrical battery 200, so that the two ends of the cylindrical battery 200 are fixed to the base plate 102 by the adhesive layers 105, so that the cylindrical battery 200 can obtain a better fixing effect.

[0050] In another specific embodiment, adhesive areas 1011 are provided on both sides of the insulation area 1012 within the battery housing area 101. In other words, when adhesive layers 105 are provided on both sides of the insulation layer 104 within the battery housing area 101, the adhesive layer 105 on one side of the insulation layer 104 is used to fix one cylindrical battery 200, and the adhesive layer 105 on the other side of the insulation layer 104 is used to fix another cylindrical battery 200. That is, in this embodiment, the adhesive layers 105 on both sides of the insulation layer 104 are used to fix two cylindrical batteries 200 respectively, and the two cylindrical batteries 200 / two rows of cylindrical batteries 200 share one insulation layer 104.

[0051] For ease of understanding, the two cylindrical batteries 200 fixed by the adhesive layers 105 on both sides of the insulation layer 104 are defined as the first cylindrical battery and the second cylindrical battery, respectively. The adhesive layer 105 corresponding to the first cylindrical battery is defined as the first adhesive layer, and the adhesive layer 105 corresponding to the second cylindrical battery is defined as the second adhesive layer.

[0052] A portion of the first cylindrical battery is bonded and fixed by the first adhesive layer, and a portion is located on the insulation layer 104 of the insulation zone 1012. A portion of the second cylindrical battery is bonded and fixed by the second adhesive layer, and a portion is located on the insulation layer 104 of the insulation zone 1012.

[0053] The battery pack structure disclosed in the above embodiments is such that when the space of the battery receiving area 101 is large enough to accommodate two rows of cylindrical batteries 200 ( Figure 7 In the illustrated scheme, a battery receiving area 101 can accommodate two rows of cylindrical batteries 200. Adhesive areas 1011 are provided on both sides of the insulation area 1012. When the two rows of cylindrical batteries 200 are placed in the battery receiving area 101, the adhesive layer 105 of the adhesive areas 1011 on both sides of the insulation area 1012 can fix a portion of the corresponding row of cylindrical batteries 200, while the other portions can be attached to the insulation layer 104, so that the cylindrical batteries 200 have a larger insulation area, thereby enabling the cylindrical batteries 200 to obtain a better insulation effect.

[0054] In one specific embodiment of this application, an adhesive area 1011 may be provided only on one side of the insulation area 1012 within at least one battery receiving area 101. That is, in this embodiment, the battery receiving area 101 can only accommodate one row of cylindrical batteries 200, a portion of the cylindrical batteries 200 is bonded and fixed by the adhesive layer 105 of the adhesive area 1011, and a portion is located on the insulation layer 104 of the insulation area 1012.

[0055] Those skilled in the art can, based on design requirements, choose a battery receiving area 101 that can only accommodate one row of cylindrical batteries 200, or choose to set the bonding area 1011 only on one side of the insulation area 1012, or of course, choose to set the bonding area 1011 on both sides of the insulation area 1012. If the length of the bonding area 1011 (i.e., the axial dimension of the cylindrical battery 200) is the same in both arrangements, if the bonding area 1011 is set only on one side of the insulation area 1012, the insulation area 1012 will have a larger area, which will also allow the cylindrical battery 200 to have a larger insulation area and obtain a better insulation effect. If the bonding area 1011 is set on both sides of the insulation area 1012, the bonding area 1011 will have a larger area, which will also allow the cylindrical battery 200 to have a larger fixing area and obtain a better fixing effect. At the same time, bonding and fixing the two ends of the cylindrical battery 200 can also obtain better fixing performance.

[0056] Those skilled in the art can select the layout of the insulation layer 104 and the adhesive layer 105 based on the requirements of fixing and heat preservation, when a battery accommodating area 101 can only accommodate one row of cylindrical batteries 200. The layout of the insulation layer 104 and the adhesive layer 105 includes, but is not limited to, arranging the adhesive layer 105 on one or both sides of the insulation layer 104, the length relationship between the insulation layer 104 and the adhesive layer 105, whether there is an overlapping area between the adhesive layer 105 and the insulation layer 104, and whether there is a gap between the adhesive layer 105 and the insulation layer 104, etc.

[0057] In one specific embodiment of this application, the adhesive layer 105 corresponding to at least two adjacent cylindrical batteries 200 within at least one battery receiving area 101 is an integral adhesive layer. An integral adhesive layer means that the adhesive layers 105 corresponding to the plurality of cylindrical batteries 200 are uniformly coated, so that the adhesive layers 105 corresponding to each cylindrical battery 200 are connected together to form an integral structure.

[0058] For example, along the stacking direction of the cylindrical batteries 200 in the battery housing area 101, the adhesive layers 105 on the same side of the insulation layer 104 can all be designed as an integral adhesive layer, that is, the adhesive layer is uniformly coated on one side of the insulation layer 104, so that the adhesive layers on at least one side of the insulation layer 104 are all connected together to form an integral adhesive layer; for example, only the adhesive layer on the first side or the second side of the insulation layer 104 can be designed as an integral adhesive layer, or the adhesive layers on both sides of the insulation layer 104 can be designed as integral adhesive layers respectively.

[0059] Alternatively, the adhesive layer 105 on the same side of the insulation layer 104 can be designed as multiple integrated adhesive layers in different areas. That is, the adhesive layer 105 on the same side of the insulation layer 104 is divided into multiple areas, and the adhesive layer corresponding to each area is designed as an integrated structure, with gaps formed between the adhesive layers 105 of adjacent areas.

[0060] When the adhesive layers 105 corresponding to at least two cylindrical batteries 200 are connected together to form an integrated adhesive layer, the force on each cylindrical battery 200 bonded and fixed by this integrated adhesive layer is more uniform. A uniformly coated integrated adhesive layer ensures that the connection between each cylindrical battery 200 is subjected to uniform force. During battery pack operation, it is subjected to various external forces, such as vibration and impact. When each cylindrical battery 200 is individually coated with an adhesive layer 105, the coating of the adhesive layer 105 corresponding to each cylindrical battery 200 is uneven. This results in some cylindrical batteries 200 having stronger adhesion, while others have weaker adhesion. For cylindrical batteries 200 with insufficient adhesion, they are prone to loosening or even separation under stress, affecting the performance and safety of the battery pack.

[0061] When multiple cylindrical cells 200 are coated with adhesive at the same time, the adhesive layer 105 will have a larger coating area, making it easier to ensure the uniformity of the thickness of the adhesive layer 105. The uniform integral adhesive layer can evenly distribute the external force to each cylindrical cell 200, ensuring the stability of the entire battery pack structure and reducing the risk of connection failure caused by excessive local stress.

[0062] When at least two cylindrical batteries 200 have their corresponding adhesive layers 105 joined together to form an integrated adhesive layer, the adhesive layer can be coated using a uniform coating process and parameters, facilitating automated production. Automated equipment can operate according to preset standards, quickly and accurately completing the adhesive coating work for each cylindrical battery 200. Compared to manual, arbitrary coating, this significantly improves production efficiency and reduces production costs.

[0063] During the production process, uniform adhesive coating allows for strict control over the coating process, ensuring that the adhesive layer quality of each cylindrical battery meets standard requirements and reducing product quality issues caused by adhesive layer variations. This is crucial for the large-scale production of high-quality battery products and helps improve product yield.

[0064] It should be noted that an independent adhesive layer 105 can be provided for each cylindrical battery 200, or an independent adhesive layer 105 can be provided for some cylindrical batteries 200, while a uniform integrated adhesive layer can be provided for some cylindrical batteries 200. The specific arrangement of the adhesive layer 105 can be designed by those skilled in the art according to the product requirements, and this embodiment does not limit the arrangement of the adhesive layer 105.

[0065] In one specific embodiment of this application, the insulation layer 104 corresponding to at least two adjacent cylindrical batteries 200 within at least one battery housing area 101 is an integral insulation layer. That is, in this embodiment, within the battery housing area 101, along the arrangement direction of the cylindrical batteries 200, multiple adjacent cylindrical batteries 200 can use the same insulation layer 104. For example, within the battery housing area 101, along the arrangement direction of the cylindrical batteries 200, the insulation layers 104 corresponding to a row of cylindrical batteries 200 can all be the same insulation layer, that is, the insulation layers 104 corresponding to each cylindrical battery 200 in that row are connected to each other as an integral insulation layer. Of course, the insulation layers 104 corresponding to a row of cylindrical batteries 200 along the arrangement direction of the cylindrical batteries 200 can also be designed as multiple integral insulation layers in different areas. That is, the insulation layer 104 corresponding to a row of cylindrical batteries 200 is divided into multiple regions along the arrangement direction of the row of cylindrical batteries 200. The insulation layer 104 corresponding to each region is designed as an integral structure, and the insulation layers 104 of adjacent regions are separated.

[0066] When installing the insulation layer 104, its large surface area allows it to accommodate multiple cylindrical batteries 200 simultaneously, simplifying the process and significantly reducing installation workload and time. It eliminates the need to lay the insulation layer 104 on each individual cylindrical battery 200, saving labor costs and installation time. On large-scale battery production lines, this can significantly improve production efficiency and reduce overall production costs.

[0067] When multiple cylindrical batteries 200 use the same insulation layer 104, it effectively reduces the potential for abnormal heat transfer that might occur when each cylindrical battery 200 has its own independently installed insulation layer 104 and then the layers are spliced ​​together. Abnormal heat transfer can occur in these areas, affecting the insulation performance. A uniform insulation layer 104, without excessive seams, allows for more even heat distribution within the battery pack, resulting in more stable and efficient overall insulation performance.

[0068] If a row of cylindrical cells 200 uses the same insulation layer 104, a uniform thermal environment can be created for that row of cylindrical cells 200. During battery operation, the heat generated by the cylindrical cells 200 can be better regulated within this relatively enclosed and uniform space, avoiding localized excessively high or low temperatures due to differences between individual insulation layers 104. This helps maintain the temperature consistency of the entire battery pack, extends the battery pack's lifespan, and improves performance.

[0069] In a specific embodiment of this application, the length of the cylindrical battery 200 is L, and the range of (a+b) / L is 0.6 to 1.0 (a, b, and L must all use the same unit, such as mm), for example, it can be 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95, 1.0, etc. The cylindrical battery 200 includes a battery casing and a cell disposed within the battery casing. The battery casing includes two oppositely disposed end faces and an outer surface located between the two end faces. At least one end face is provided with an electrode assembly, and the electrode assemblies of two cylindrical batteries 200 are electrically connected through a conductive element 300. The length of the cylindrical battery 200 refers to the distance between the two end faces of the battery casing, that is, the axial dimension of the cylindrical battery 200.

[0070] In this embodiment, the larger the value of (a+b) / L, the greater the overlap between the insulation layer 104 and the adhesive layer 105 and the cylindrical battery 200. For example, only 60% of the axial length of the cylindrical battery 200 may be covered with the insulation layer 104 and the adhesive layer 105, or the entire length may be covered with the insulation layer 104 and the adhesive layer 105. The specific choice can be made based on cost, fixed requirements, and insulation requirements.

[0071] When the cylindrical battery 200 is a cylindrical battery, the diameter of the cylindrical battery 200 is in the range of 15mm to 50mm. For example, the diameter of the cylindrical battery 200 can be 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, etc. Then a / b satisfies: 5≤a / b≤12.

[0072] When the diameter of the cylindrical battery 200 is larger, the contact area between the outer cylindrical surface of the cylindrical battery 200 and the adhesive layer 105 is larger, and the bonding strength is higher. Therefore, it is not necessary to increase the length of the adhesive layer 105 to obtain a larger bonding strength.

[0073] In order to ensure the heat insulation effect, the value of 'a' can be increased, that is, the length of overlap between the cylindrical battery 200 and the insulation layer 104 in the orthographic projection of the base plate 102 can be increased, so that a larger area of ​​the cylindrical battery 200 is covered by the insulation layer 104, thereby improving the heat insulation effect.

[0074] When the diameter of the cylindrical battery 200 is small, the contact area between the outer circumference of the cylindrical battery 200 and the adhesive layer 105 is small, resulting in low bonding strength. Therefore, the value of 'b' needs to be increased to obtain greater bonding strength, i.e., increasing the length of overlap between the cylindrical battery 200 and the insulation layer 104 in the orthographic projection of the base plate 102. Correspondingly, the value of 'a' can be decreased, i.e., decreasing the length of overlap between the cylindrical battery 200 and the insulation layer 104 in the orthographic projection of the base plate 102, allowing a larger area of ​​the cylindrical battery 200 to be covered by the adhesive layer 105, thus ensuring the effective fixation of the cylindrical battery 200.

[0075] like Figure 7 As shown, at least one end of the cylindrical battery 200 is connected to a conductive element 300. The power receiving end of the cylindrical battery 200 and the projection of the insulation layer 104 on the base plate 102 are spaced apart. The power receiving end of the cylindrical battery 200 is the end of the cylindrical battery 200 connected to the conductive element 300.

[0076] The end face of the cylindrical battery 200 with the terminal assembly is the power receiving terminal. The terminal assemblies of two cylindrical batteries 200 are electrically connected through the conductive element 300. The terminal assembly generally includes a positive terminal assembly and a negative terminal assembly. When two cylindrical batteries 200 are connected in series, the conductive element 300 needs to electrically connect the positive terminal assembly of one cylindrical battery 200 and the negative terminal assembly of the other cylindrical battery 200 respectively. When two cylindrical batteries 200 are connected in parallel, the conductive element 300 needs to electrically connect the terminal assemblies of the same polarity of the two cylindrical batteries 200 respectively.

[0077] In this embodiment, the electrical terminal of the cylindrical battery 200 and the projection of the insulation layer 104 on the base plate 102 are spaced apart, that is, the adhesive layer 105 is disposed at the end of the cylindrical battery 200 with the conductive element 300. The conductive element 300 is usually arranged at the edge of the battery box, where heat dissipation conditions are better. By placing the adhesive layer 105 at the end of the cylindrical battery 200 with the conductive element 300, compared to placing the insulation layer 104 at the same end, the impact of the high heat generation of the conductive element 300 can be reduced, and the insulation layer 104 can be avoided from affecting the heat dissipation of the area where the conductive element 300 is located.

[0078] Both ends of the cylindrical battery 200 can be connected to conductive components 300, then a / b satisfies: 3.5≤a / b≤9.0. In this embodiment, reducing the upper limit of a / b allows b to have a larger value, ensuring that the length of the cylindrical battery 200 in the orthographic projection of the base plate 102 that overlaps with the adhesive layer 105 but does not overlap with the insulation layer 104 is greater, thereby obtaining a greater bonding and fixing effect.

[0079] In one specific embodiment of this application, an insulating layer is provided on the surface of the cylindrical battery 200. The bonding strength between the insulating layer and the adhesive layer 105 is poor, and the insulating layer has a certain heat insulation capacity. Therefore, when an insulating layer is provided on the surface of the cylindrical battery 200, the length 'a' of the cylindrical battery 200 overlapping with the heat insulation layer 104 in the orthographic projection of the base plate 102 can be reduced, and the length 'b' of the cylindrical battery 200 overlapping with the adhesive layer 105 but not with the heat insulation layer 104 can be increased.

[0080] like Figure 7As shown, when 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 is used to dissipate heat from the cylindrical battery 200 at the end of the cylindrical battery 200 away from the conductive element 300, so as to reduce the temperature of the cylindrical battery 200.

[0081] Batteries may experience thermal runaway under conditions such as overcharging, over-discharging, short circuits, or high temperatures, leading to fire or explosion. Real-time temperature monitoring can trigger protection mechanisms in a timely manner, such as cutting off the circuit or activating the cooling system. Abnormal temperature increases may signal internal faults (such as short circuits or aging), so monitoring battery issues can provide early warnings to prevent accidents. Furthermore, battery thermal management control also requires monitoring battery temperature and, based on temperature data, activating the cooling system or heating device to maintain the battery within its optimal operating temperature range.

[0082] like Figure 7 and Figure 8 As shown, in this embodiment, a temperature acquisition device 500 is provided on the outer surface of the battery casing of at least one cylindrical battery 200. Those skilled in the art can select which cylindrical batteries 200 in the battery pack require the temperature acquisition device 500 according to their needs. To reflect the temperature of the battery pack, multiple temperature acquisition devices 500 can be provided and arranged as dispersedly as possible to prevent them from being concentrated in a small area. The temperature acquisition device 500 can be an NTC (Negative Temperature Coefficient) thermistor or other temperature measuring devices capable of detecting the temperature of the cylindrical battery 200. This embodiment does not limit the specific type of temperature acquisition device 500.

[0083] The temperature acquisition device 500 can be fixed to the outer peripheral surface of the cylindrical battery 200 by adhesive. The adhesive used to bond the temperature acquisition device 500 can be a thermally conductive structural adhesive or other adhesives, as long as it can achieve the bonding and fixing of the temperature acquisition device 500. Of course, the temperature acquisition device 500 can also be fixed to the outer peripheral surface of the cylindrical battery 200 by other fixing methods.

[0084] The battery pack disclosed in this application embodiment can be provided with one layer of cylindrical batteries 200 or multiple layers of cylindrical batteries 200. When multiple layers of cylindrical batteries 200 are provided, the bottommost cylindrical battery 200 can be arranged on the base plate 102, and the other layers of cylindrical batteries 200 are stacked upwards in a direction perpendicular to the base plate 102. A support partition 106 is provided between two adjacent layers of cylindrical batteries 200. The support partition 106 is used to separate the two adjacent layers of cylindrical batteries 200 and to support the upper layer of cylindrical batteries 200.

[0085] When the cylindrical battery 200 is a cylindrical battery, the support spacer 106 can be a corrugated plate, that is, the support spacer 106 has spaced and continuous upwardly concave curved grooves and downwardly concave curved grooves. The cylindrical batteries 200 on the lower side of the support spacer 106 are arranged sequentially in the downwardly concave curved grooves of the support spacer 106, while the cylindrical batteries 200 on the upper side of the support spacer 106 are arranged sequentially in the upwardly concave curved grooves of the support spacer 106.

[0086] This application also discloses an electrical device that includes the battery pack disclosed in the above embodiments. This electrical device can be an electric vehicle, an electric ship, an aircraft, an energy storage device, etc. The electrical device disclosed in this application, having the aforementioned battery pack, possesses all the technical effects of the battery pack, which will not be elaborated upon further here.

[0087] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0088] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0089] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0090] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A battery pack, characterized in that, It includes a base plate (102) and a cylindrical battery pack disposed on the base plate (102), the cylindrical battery pack including a plurality of cylindrical batteries (200), the axial direction of the cylindrical batteries (200) being parallel to the base plate (102); At least one of the cylindrical batteries (200) and the base plate (102) are provided with a heat insulation layer (104) and an adhesive layer (105), the heat insulation layer (104) and the adhesive layer (105) being distributed along the axial direction of the cylindrical battery (200); Along the axial direction of the cylindrical battery (200), the length by which the orthographic projection of the cylindrical battery (200) onto the base plate (102) overlaps with the insulation layer (104) is a, and the length by which it overlaps with the adhesive layer (105) but not with the insulation layer (104) is b. Then a / b satisfies: 3.5≤a / b≤12.

2. The battery pack of claim 1, wherein, At least one battery receiving area (101) for accommodating a cylindrical battery (200) is formed on the base plate (102), and the adhesive layer (105) is provided on both sides of the heat insulation layer (104) in at least one of the battery receiving areas (101).

3. The battery pack of claim 2, wherein, When the adhesive layer (105) is provided on both sides of the heat insulation layer (104) in the battery housing area (101), the adhesive layer (105) on one side of the heat insulation layer (104) is used to fix one end of the cylindrical battery (200), and the adhesive layer (105) on the other side of the heat insulation layer (104) is used to fix the other end of the cylindrical battery (200).

4. The battery pack of claim 2, wherein, When the adhesive layer (105) is provided on both sides of the heat insulation layer (104) in the battery housing area (101), the adhesive layer (105) on one side of the heat insulation layer (104) is used to fix one of the cylindrical batteries (200), and the adhesive layer (105) on the other side of the heat insulation layer (104) is used to fix another cylindrical battery (200).

5. The battery pack of claim 1, wherein, At least one battery receiving area (101) for accommodating a cylindrical battery (200) is formed on the base plate (102), and the adhesive layer (105) is provided on one side of the insulation layer (104) in at least one of the battery receiving areas (101).

6. The battery pack of any one of claims 1-5, wherein, At least one battery receiving area (101) for accommodating a cylindrical battery (200) is formed on the base plate (102), and the adhesive layer (105) corresponding to at least two adjacent cylindrical batteries (200) in at least one of the battery receiving areas (101) is an integral adhesive layer.

7. The battery pack of any one of claims 1-5, wherein, At least one battery receiving area (101) for accommodating a cylindrical battery (200) is formed on the base plate (102), and the insulation layer (104) corresponding to at least two adjacent cylindrical batteries (200) in at least one of the battery receiving areas (101) is an integral insulation layer.

8. The battery pack of any one of claims 1-5, wherein, The length of the cylindrical battery (200) is L, then the range of (a+b) / L is 0.6 to 1.

0.

9. The battery pack of any one of claims 1-5, wherein, The diameter of the cylindrical battery (200) ranges from 15mm to 50mm, so a / b satisfies: 5≤a / b≤12.

10. The battery pack of any one of claims 1-5, wherein, At least one end of the cylindrical battery (200) is connected to a conductive element (300), and the power receiving end of the cylindrical battery (200) is spaced apart from the projection of the heat insulation layer (104) on the base plate (102). The power receiving end of the cylindrical battery (200) is the end of the cylindrical battery (200) connected to the conductive element (300).

11. The battery pack of claim 10, wherein, The cylindrical battery (200) is connected to the conductive element (300) at both ends, and then a / b satisfies: 3.5≤a / b≤9.

0.

12. The battery pack of any one of claims 1-5, wherein, The length a of the cylindrical battery (200) overlapping the insulation layer (104) with the base plate (102) in the orthographic projection of the base plate (102) is 75mm to 120mm. And / or, The length b of the cylindrical battery (200) in the orthographic projection of the base plate (102) that overlaps with the adhesive layer (105) but does not overlap with the heat insulation layer (104) is 10mm to 75mm.

13. The battery pack of any one of claims 1-5, wherein, The cylindrical battery (200) has an insulating layer on its surface.

14. An electrical device, characterized by Includes the battery pack as described in any one of claims 1-13.

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