Battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery pack, which comprises a plurality of battery cells, the edge of the top of each battery cell is provided with a concave first windowing area, and the first windowing area is used for coating an adhesive; the two opposite sides of each connecting piece are respectively glued on the first windowing areas of the two adjacent battery cells, and the plurality of battery cells are connected through the plurality of connecting pieces to form a battery cell module; and the battery cell module is adhered to the bottom of the battery shell. According to the battery pack provided by the utility model, the adhesive is accurately coated in the first windowing area at the top of the battery cell, so that the bonding strength between the battery cells is improved, and the insulation requirement is met. And the first windowing areas of the adjacent battery cells are firmly connected together by the connecting piece at the top, so that a rigid large module is formed, and the vibration resistance and the structural stability of the whole battery pack are enhanced.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to battery packs. Background Technology

[0002] In related technologies, with the development of new energy vehicles, the range and reliability of battery packs have become the focus of research. In existing CTP (Cell to Pack) structural designs, the cells are usually fixed together by applying adhesive to the bottom of the cable tie module and then installed inside the battery pack housing.

[0003] However, while this traditional CTP structure design can meet basic functional requirements to a certain extent, it has some significant problems. For example, traditional CTP structures use cable ties for fixing, and these additional fixing devices occupy valuable space, reducing the effective volume utilization rate inside the battery pack, thus limiting the maximum energy density and range of the battery pack. Furthermore, due to the presence of cable ties and their associated structures, the connections between cells are not direct enough, making them prone to loosening or displacement under external forces such as vibration or impact, affecting the stability of the electrical connections between cells and the overall structural strength. In addition, traditional designs may not provide sufficient insulation protection, especially between cells and between cells and the battery pack casing, increasing the risk of short circuits and other electrical faults. Utility Model Content

[0004] In view of this, the present invention provides a battery pack to solve the problems of complex assembly structure and low volume utilization of existing battery packs.

[0005] In a first aspect, this utility model provides a battery pack, comprising:

[0006] Multiple battery cells, each of which has a recessed first window area on the top edge, the first window area being used for applying adhesive;

[0007] A plurality of connectors are attached to the first window area of ​​two adjacent battery cells on opposite sides, and the plurality of battery cells are connected by the plurality of connectors to form a battery cell module.

[0008] The battery casing has the cell module glued to the bottom.

[0009] Beneficial effects: (1) Elimination of traditional cable ties and their associated structures: By setting a recessed first window area on the top edge of each cell and applying adhesive to this area, the first window areas of adjacent cells are then firmly glued together using connectors. This design not only eliminates the space-consuming cable ties, but also allows the cells to be directly connected to each other, improving volume utilization.

[0010] (2) Enhanced structural strength and connection reliability: Multiple cells are connected by several connectors to form a rigid large module, which greatly enhances the overall structural strength and vibration resistance of the battery pack and reduces the possibility of cell displacement or loosening caused by external impact.

[0011] (3) Improved insulation and safety: By precisely controlling the amount of adhesive applied in the first window area, good electrical insulation is ensured, while avoiding the potential short-circuit risk present in traditional designs. In addition, the cell module is directly glued to the battery casing from its bottom, further enhancing the safety and stability of the entire battery pack.

[0012] In one alternative embodiment, the battery cell includes a battery cell housing and an insulating layer wrapped around the surface of the battery cell housing, wherein the insulating layer located at the top of the battery cell is provided with a window to form a first window area, and the adhesive is applied to the battery cell housing located at the bottom of the first window area.

[0013] Beneficial effects: In the first window area mentioned above, the adhesive is applied directly to the surface of the cell casing. This arrangement has the following advantages: (1) Enhanced connection strength: Since the adhesive acts directly on the cell casing rather than the insulation layer, it can provide a stronger bonding effect and effectively connect adjacent cells firmly together. (2) Ensured electrical insulation: Although the surface of the cell casing is exposed, it is limited to the first window area, and the rest is still covered by the insulation layer, ensuring overall electrical safety. (3) Simplified manufacturing process: Compared with traditional complex fixing methods (such as using cable ties), this design simplifies the production process, reduces the number of components, and improves assembly efficiency.

[0014] In one optional embodiment, the plurality of battery cells are divided into at least two groups of battery cells arranged along a first direction, each group of battery cells including at least two of the battery cells arranged along a second direction, and adjacent groups of battery cells are connected by the connector, wherein the first direction is perpendicular to the second direction.

[0015] Beneficial effects: The above-mentioned grid-like arrangement not only makes the cell layout more regular and orderly, but also enhances the structural strength and stability of the entire cell module through the connectors.

[0016] In one alternative embodiment, each of the battery cells has two first window areas on its top; wherein, along the first direction, the two first window areas are located on opposite sides of the top of the battery cell, and both first window areas extend along the second direction.

[0017] Beneficial effects: The two first window areas on the top of each cell create a stable connection point between adjacent cells. Connectors can be glued to the first window areas of adjacent cells at these two locations, providing stronger structural support and higher connection reliability. This design not only enhances the bonding force between cells but also optimizes the overall mechanical strength and vibration resistance of the battery pack, while maintaining necessary electrical insulation.

[0018] In one alternative implementation, the two first window areas are symmetrically arranged along the center of the battery cell.

[0019] Beneficial effects: The symmetrical arrangement of the two first window areas allows for a more balanced connection strength when adjacent cells are bonded together using connectors, thus improving the mechanical stability of the entire cell module. Furthermore, the symmetrical design simplifies positioning and installation steps during manufacturing, as only one pattern needs to be followed to ensure consistency across all cells. Additionally, the symmetrical layout allows for better utilization of the space at the top of the cells while ensuring that the installation or function of other components is not affected.

[0020] In one optional implementation, the first window areas on different cells within the same group of cells are positioned opposite each other and all extend along the second direction;

[0021] The connector has a first connecting side and a second connecting side. The first connecting side and the second connecting side are arranged opposite to each other along the first direction and both extend along the second direction. The first connecting side and the second connecting side are respectively bonded to the first window area of ​​two adjacent sets of battery cells.

[0022] Beneficial effects: This method not only achieves a stable connection between cells within a single group, but also ensures a tight connection between adjacent cell groups, thereby improving the structural strength and stability of the entire battery pack.

[0023] In one optional embodiment, a partition is also connected to the bottom of the connector. The partition is sandwiched between two adjacent sets of cells and extends toward the bottom of the battery casing. The first connecting side and the second connecting side are respectively located on both sides of the partition along the first direction.

[0024] Beneficial effects: On the one hand, the separator, sandwiched between two adjacent groups of cells, provides a physical barrier, increasing the overall rigidity and vibration resistance of the battery pack. This design helps prevent cell displacement or deformation due to vibration or impact during use. On the other hand, the separator can also act as a heat insulator, reducing heat transfer from one group of cells to another, thus preventing localized overheating. Furthermore, the separator provides additional electrical isolation between cells, preventing accidental contact or short circuits between different cells and improving overall safety.

[0025] In one alternative embodiment, each of the battery cells has a recessed second window area formed at its bottom, the insulating layer at the bottom of the battery cell is provided with a window to form the second window area, and the adhesive is applied to the battery cell casing at the bottom of the second window area.

[0026] Beneficial effects: By setting a second window area at the bottom of the cell and applying adhesive directly to the cell casing, the connection strength between the cell and the battery casing can be significantly enhanced, improving the mechanical stability of the entire battery pack. Furthermore, although the second window area removes part of the insulation layer, this is limited to critical locations at the bottom; the remaining portion is still covered by the insulation layer, ensuring overall electrical safety.

[0027] In one alternative embodiment, the battery housing includes a battery frame and a cold plate, the cold plate being fixed to the battery frame to form the base plate of the battery housing, and the cell module being glued to the cold plate through the second window area.

[0028] Beneficial effects: The strong adhesion between the cell module and the cold plate significantly improves the mechanical stability of the entire battery pack. The cold plate not only serves as a mounting base but also effectively dissipates heat generated during cell operation, ensuring the battery pack's operating temperature remains within a safe range. Furthermore, this design simplifies the production process, reduces the number of components, and improves assembly efficiency.

[0029] In one alternative implementation, the area of ​​the second window area is greater than or equal to one-third of the bottom area of ​​the battery cell.

[0030] Beneficial effects: This larger bonding area can significantly improve the mechanical connection strength between the cell and the battery casing (such as the cold plate), ensuring that the cell module is more firmly fixed in the battery pack. Attached Figure Description

[0031] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is a top view of the battery cell according to an embodiment of the present invention;

[0033] Figure 2 This is a bottom view of the battery cell according to an embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of the battery pack structure according to an embodiment of the present invention;

[0035] Figure 4 This is an exploded view of the battery pack according to an embodiment of the present invention;

[0036] Figure 5 This is a schematic diagram of the battery module structure according to an embodiment of the present invention;

[0037] Figure 6 This is a top view of multiple battery cells arranged according to an embodiment of the present invention;

[0038] Figure 7 This is a bottom view of the arrangement of multiple battery cells according to an embodiment of the present invention.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1. Battery cell; 11. First window area; 12. Second window area; 13. Insulation layer; 14. Terminal post; 15. Explosion-proof valve;

[0041] 2. Connector; 21. First connecting side; 22. Second connecting side;

[0042] 3. Battery casing; 31. Battery frame; 32. Cold plate;

[0043] 4. Partition; 5. Expansion material. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0045] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0047] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0048] The following description, with reference to the accompanying drawings, illustrates a battery pack provided by this utility model.

[0049] like Figures 1 to 7 As shown, the battery pack according to an embodiment of the present invention includes multiple battery cells 1, several connectors 2, and a battery casing 3.

[0050] Each cell 1 has a recessed first window area 11 along its top edge, where adhesive is applied. The opposite sides of the connector 2 are glued to the first window areas 11 of two adjacent cells 1, and multiple cells 1 are connected by several connectors 2 to form a cell 1 module. The cell 1 module is glued to the bottom of the battery casing 3.

[0051] It is understood that in the battery pack structure provided in this utility model, each cell 1 has a recessed first window area 11 on its top edge. The aforementioned first window area 11 is specifically designed for applying adhesive, thereby enhancing the connection strength between adjacent cells 1 and ensuring electrical insulation. Connectors 2 are adhesively bonded to the first window areas 11 of two adjacent cells 1 on both sides. The function of connectors 2 is to firmly connect multiple cells 1 together to form a single cell 1 module. This connection method replaces traditional cable ties and their associated structures, improving space utilization and structural rigidity. The final cell 1 module is then adhesively fixed to the battery casing 3 at the bottom. The battery casing 3, as the basic frame of the entire battery pack, provides necessary physical protection and supports the installation of the cell 1 module.

[0052] Based on the aforementioned battery pack structure, its working principle is as follows: The battery pack's working principle mainly relies on its unique top window area design and precise adhesive bonding process to achieve higher structural strength and stability. Specifically, by applying adhesive to the first window area 11 on the top of the cell 1 and using connectors 2 to connect multiple cells 1 into a single module, the mechanical strength and vibration resistance of the battery pack are greatly improved. Furthermore, this design also ensures good electrical insulation, avoiding poor contact or short circuits between cells 1 caused by vibration or other external forces.

[0053] Furthermore, the specific assembly process of the battery pack of this utility model is as follows: During assembly, adhesive is first applied to the first window area 11 on the top of each battery cell 1. Then, multiple battery cells 1 are arranged in a predetermined direction and tightly bonded together using connectors 2 to form a robust battery cell 1 module. Finally, this battery cell 1 module is glued to the battery casing 3 at the bottom to ensure the stability and safety of the entire battery pack.

[0054] In related technologies, with the development of new energy vehicles, the range and reliability of battery packs have become the focus of research. In existing CTP (Cell to Pack) structural designs, the cells are usually fixed together by applying adhesive to the bottom of the cable tie module and then installed inside the battery pack housing.

[0055] However, while this traditional CTP structure design can meet basic functional requirements to a certain extent, it has some significant problems. For example, traditional CTP structures use cable ties for fixing, and these additional fixing devices occupy valuable space, reducing the effective volume utilization rate inside the battery pack, thus limiting the maximum energy density and range of the battery pack. Furthermore, due to the presence of cable ties and their associated structures, the connections between cells are not direct enough, making them prone to loosening or displacement under external forces such as vibration or impact, affecting the stability of the electrical connections between cells and the overall structural strength. In addition, traditional designs may not provide sufficient insulation protection, especially between cells and between cells and the battery pack casing, increasing the risk of short circuits and other electrical faults.

[0056] In summary, to address the technical deficiencies in the aforementioned related technologies, this utility model provides a battery pack that improves the bonding strength between battery cells 1 and meets insulation requirements by precisely applying adhesive to the first window area 11 on the top of the battery cell 1. The top connector 2 firmly connects the first window areas 11 of adjacent battery cells 1 together, forming a rigid large module, which enhances the vibration resistance and structural stability of the entire battery pack.

[0057] Furthermore, the battery pack of this invention has at least the following advantages compared to related technologies:

[0058] (1) Elimination of traditional cable ties and their associated structures: By setting a recessed first window area 11 on the top edge of each battery cell 1, applying adhesive to this area, and then using connectors 2 to firmly glue the first window areas 11 of adjacent battery cells 1 together. This design not only eliminates the space-consuming cable ties, but also allows the battery cells 1 to be directly connected to each other, improving volume utilization.

[0059] (2) Enhanced structural strength and connection reliability: Multiple cells 1 are connected by several connectors 2 to form a rigid large module, which greatly enhances the overall structural strength and vibration resistance of the battery pack and reduces the possibility of cell 1 displacement or loosening due to external impact.

[0060] (3) Improved insulation and safety: By precisely controlling the amount of adhesive applied in the first window area 11, good electrical insulation is ensured, while avoiding the potential short-circuit risk present in traditional designs. In addition, the cell module 1 is directly glued to the battery casing 3 at its bottom, further enhancing the safety and stability of the entire battery pack.

[0061] like Figure 1As shown, according to some embodiments of the present invention, the battery cell 1 includes a battery cell 1 shell and an insulating layer 13 wrapped around the surface of the battery cell 1 shell. The insulating layer 13 located at the top of the battery cell 1 is provided with a window to form a first window area 11, and an adhesive is applied to the battery cell 1 shell located at the bottom of the first window area 11.

[0062] In this embodiment, each cell 1 consists of a cell 1 casing, which is responsible for containing the chemical substances inside the battery and protecting them from the influence of the external environment. In addition, an insulating layer 13 is wrapped around the outside of the cell 1 casing. This insulating material is used to prevent electrical contact between different cells 1, thereby avoiding short circuits or other electrical faults.

[0063] In this design, on the top of the battery cell 1, the insulating layer 13 is designed with recessed areas of a specific shape and size, namely the first window area 11. These window areas are formed by removing a portion of the insulating layer 13, allowing the battery cell 1 casing to be directly exposed within these areas. This design allows adhesive to be applied directly to the exposed surface of the battery cell 1 casing without penetrating or damaging the insulating layer 13.

[0064] Thus, within the first window area 11, the adhesive is directly applied to the surface of the cell 1 casing. This arrangement has the following advantages: (1) Enhanced connection strength: Since the adhesive acts directly on the cell 1 casing, rather than the insulation layer 13, it provides a stronger bonding effect, effectively and firmly connecting adjacent cells 1 together. (2) Ensured electrical insulation: Although the surface of the cell 1 casing is exposed, it is limited to the first window area 11, while the rest is still covered by the insulation layer 13, ensuring overall electrical safety. (3) Simplified manufacturing process: Compared to traditional complex fixing methods (such as using cable ties), this design simplifies the production process, reduces the number of components, and improves assembly efficiency.

[0065] like Figures 3 to 7 As shown, according to some embodiments of the present invention, a plurality of battery cells 1 are divided into at least two groups of battery cells 1 arranged along a first direction, each group of battery cells 1 includes at least two battery cells 1 arranged along a second direction, and adjacent groups of battery cells 1 are connected by a connector 2, wherein the first direction is perpendicular to the second direction.

[0066] It can be understood that the arrangement of the battery cells 1 within the battery pack is organized in two mutually perpendicular directions, thus forming a grid-like distribution structure of the battery cells 1. Specifically, multiple battery cells 1 are divided into at least two groups of battery cells 1 arranged along the first direction, and each group of battery cells 1 includes at least two battery cells 1 arranged along the second direction.

[0067] For example, the battery cells 1 inside the battery pack are arranged in a 4x5 grid (i.e., 4 cells per group, and each group of 1 cells contains 5 cells 1), forming a grid-like structure. Here, the first direction is defined as the horizontal direction (from left to right), and the second direction is defined as the horizontal direction (from front to back).

[0068] In this configuration, each row represents a cell group (1), and there are four cell groups (1) arranged along the first direction (horizontal transverse direction) within the battery pack. Each column represents the arrangement of cells (1) within each cell group (1), along the second direction (horizontal longitudinal direction), with five cells (1) within each cell group (1). Therefore, the entire battery pack contains four cell groups (1), all arranged horizontally, and each cell group consists of five cells (1), arranged sequentially along the horizontal longitudinal direction.

[0069] Furthermore, adjacent groups of cells 1 are connected by connectors 2. For example, between the leftmost group of cells 1 and the second group of cells 1 immediately to its right, the first window area 11 is firmly bonded together using connectors 2. The same method is applied between other adjacent groups of cells 1 to ensure that all groups of cells 1 can be tightly connected by connectors 2 to form a complete cell 1 module.

[0070] In this way, the above-mentioned grid-like arrangement not only makes the layout of the battery cell 1 more regular and orderly, but also enhances the structural strength and stability of the entire battery cell 1 module through the connector 2.

[0071] like Figure 1 As shown, according to some embodiments of the present invention, each battery cell 1 is provided with two first window areas 11 on its top; wherein, along the first direction, the two first window areas 11 are respectively located on opposite sides of the top of the battery cell 1, and both first window areas 11 extend along the second direction.

[0072] In this embodiment, two specific areas are designed on the top of each cell 1 for applying adhesive; these two areas are also known as the first window areas 11. Specifically, when viewed along an axis defined as a "first direction," these two first window areas 11 are arranged on opposite sides of the top of the cell 1. For example, if the first direction is from left to right, one window area may be located on the left edge of the top of the cell 1, while the other may be located on the right edge.

[0073] Furthermore, both first window areas 11 extend along a second direction, which is an axis perpendicular to the first direction. Therefore, these two first window areas 11 are not only located on opposite sides of the top of the cell 1, but they also each extend along the second direction (typically the front-to-back direction). This arrangement ensures good connection strength and stability even at both ends of the cell 1.

[0074] In this way, the two first window areas 11 on the top of each cell 1 can form a stable connection point between adjacent cells 1. The connector 2 can be glued to the first window area 11 of the adjacent cell 1 at these two locations, thereby providing stronger structural support and higher connection reliability. This design not only enhances the bonding force between cells 1, but also optimizes the overall mechanical strength and vibration resistance of the battery pack, while maintaining the necessary electrical insulation.

[0075] like Figure 1 As shown, in some specific embodiments, the two first window areas 11 are symmetrically arranged along the center of the cell 1.

[0076] In this way, because the two first window areas 11 are symmetrically arranged, a more balanced connection strength can be achieved when adjacent cells 1 are bonded together via connectors 2, thereby improving the mechanical stability of the entire cell 1 module. Furthermore, the symmetrical design simplifies the positioning and installation steps during manufacturing, as only one pattern needs to be followed to ensure the consistency of all cells 1. In addition, the symmetrical layout allows for better utilization of the space on top of the cells 1, while ensuring that the installation or function of other components is not affected.

[0077] For example, the top of the battery has a functional area that is higher than the two first window areas 11. The functional area has two pole posts 14 and an explosion-proof valve 15 located between the two pole posts 14. The two first window areas 11 are located on the left and right sides of the functional area, respectively.

[0078] like Figure 6 As shown, according to some embodiments of the present invention, the first window areas 11 on different cells 1 within the same group of cells 1 are positioned opposite each other and all extend along the second direction.

[0079] like Figure 4 and Figure 5 As shown, the connector 2 has a first connecting side 21 and a second connecting side 22. The first connecting side 21 and the second connecting side 22 are arranged opposite to each other along the first direction and both extend along the second direction. The first connecting side 21 and the second connecting side 22 are respectively bonded to the first window area 11 of two adjacent sets of battery cells 1.

[0080] In this embodiment, within the same group of cells 1 (i.e., cells 1 arranged along the second direction), the positions of the first window area 11 on the top of each cell 1 are relatively arranged. For example, the first window areas 11 on the left side of different cells 1 in a group are arranged and extend along an axis (parallel to the front-back direction), and the first window areas 11 on the right side of different cells 1 in a group are arranged and extend along another axis (parallel to the front-back direction), thereby ensuring that the first window areas 11 of all cells 1 maintain a consistent positional relationship within the group. In this way, multiple consecutive and corresponding first window areas 11 facilitate a stable connection of the same connector 2.

[0081] The connector 2 is designed with two main parts, referred to as the first connecting side 21 and the second connecting side 22. These two parts are used to bond to the first window area 11 of the adjacent cell 1. The first connecting side 21 and the second connecting side 22 are arranged opposite each other along a first direction (e.g., from left to right), that is, if the first connecting side 21 of a connector 2 is on its left, the second connecting side 22 will be on its right, and vice versa. The two connecting sides also extend along a second direction (e.g., from front to back) to ensure that they can cover and firmly bond to the first window area 11 of the adjacent cell 1.

[0082] The first connecting side 21 and the second connecting side 22 are respectively bonded to the first window area 11 of two adjacent groups of battery cells 1. Specifically, the first connecting side 21 of the connector 2 is bonded to the first window area 11 of a certain battery cell 1 in a group of battery cells 1, while the second connecting side 22 is bonded to the first window area 11 of the corresponding battery cell 1 in an adjacent group of battery cells 1. In this way, through the action of multiple connectors 2, adjacent groups of battery cells 1 can be firmly connected together to form an integral structure.

[0083] In summary, this method not only achieves a stable connection between individual cells 1, but also ensures a tight connection between adjacent cell 1 groups, thereby improving the structural strength and stability of the entire battery pack.

[0084] For example, each group of cells 1 contains four cells 1 (A1, A2, A3, A4), which are arranged along a second direction (perpendicular to the first direction). Each cell 1 has two first window areas 11 on its top, one on the left and the other on the right.

[0085] Each cell 1 has a first window area 11 on its left side, and these window areas are arranged and extend along an axis parallel to the front-back direction. Specifically, in cells A1, A2, A3 and A4, their left-side first window areas 11 are all located on the left edge of their respective cells 1, and the center lines of these window areas are all on the same straight line.

[0086] Similarly, each cell 1 also has a first window area 11 on its right side, and these window areas are also arranged and extend along another axis parallel to the front-back direction. Specifically, in cells A1, A2, A3 and A4, their right-side first window areas 11 are all located on the right edge of their respective cells 1, and the center lines of these window areas are also on the same straight line.

[0087] In the same group of battery cells 1, since the left first window area 11 of all battery cells 1 is arranged and extends along the same axis, a long strip connector 2 can be used, with its first connecting side 21 bonded to the left first window area 11 of all battery cells 1. Similarly, the right first window area 11 of all battery cells 1 is also arranged and extends along another axis, so another long strip connector 2 can be used, with its second connecting side 22 bonded to the right first window area 11 of all battery cells 1.

[0088] It is understood that in the above specific embodiment, the left and right first window areas 11 of different cells 1 in a group of cells 1 are arranged and extended along two axes parallel to the front and rear directions, so that the first window areas 11 of all cells 1 maintain a consistent positional relationship in the same group, thereby facilitating stable connection using the same connector 2.

[0089] like Figure 4 As shown, according to some embodiments of the present invention, the bottom of the connector 2 is also connected to a partition 4. The partition 4 is sandwiched between two adjacent sets of cells 1 and extends toward the bottom of the battery casing 3. The first connecting side 21 and the second connecting side 22 are respectively located on both sides of the partition 4 along the first direction.

[0090] It is understandable that the separator 4 has the effects of physical separation, heat insulation, and electrical insulation. Specifically, on the one hand, the separator 4 is sandwiched between two adjacent sets of battery cells 1, providing a physical barrier and increasing the overall rigidity and vibration resistance of the battery pack. This design helps to prevent the battery cells 1 from shifting or deforming due to vibration or impact during use.

[0091] On the other hand, the partition 4 can provide insulation to a certain extent, reducing the transfer of heat from one group of cells 1 to another, thereby preventing localized overheating. Furthermore, the partition 4 can provide additional electrical isolation between the cells 1, preventing accidental contact or short circuits between different cells 1 and improving overall safety.

[0092] It should also be noted that, since the cell 1 may undergo volume changes (expansion or contraction) due to temperature changes or other factors during the charging and discharging process, the separator 4 in this embodiment can also serve as a buffer layer to absorb these expansion forces and prevent the cells 1 from being damaged or short-circuited due to mutual squeezing.

[0093] like Figure 2 and Figure 7 As shown, according to some embodiments of the present invention, each battery cell 1 has a recessed second window area 12 formed at its bottom. The insulating layer 13 located at the bottom of the battery cell 1 is provided with a window to form the second window area 12, and an adhesive is applied to the battery cell 1 casing located at the bottom of the second window area 12.

[0094] In this embodiment, in order to form the second window area 12, the insulating layer 13 is removed or cut off at a specific location on the bottom of the cell 1, exposing the outer casing of the cell 1. This window setting can be achieved by methods such as laser cutting or machining, ensuring a precise and consistent windowing effect.

[0095] The second window area 12 is typically recessed, and its shape can be rectangular, circular, or other geometric shapes, depending on design requirements and manufacturing processes. This recessed design helps increase the adhesive adhesion area and improve bond strength.

[0096] Since the insulation layer 13 is removed from the second window area 12, the outer casing of the battery cell 1 is directly exposed, allowing the adhesive to be applied directly to the outer casing of the battery cell 1. This direct contact provides a stronger bonding effect, enhancing the adhesion between the battery cell 1 and the battery casing 3.

[0097] In this way, by setting a second window area 12 at the bottom of the cell 1 and applying adhesive directly to the outer casing of the cell 1, the connection strength between the cell 1 and the battery casing 3 can be significantly enhanced, improving the mechanical stability of the entire battery pack. At the same time, although the second window area 12 removes part of the insulation layer 13, it is limited to the key position at the bottom, and the rest is still covered by the insulation layer 13, ensuring overall electrical safety.

[0098] like Figure 4 As shown, in some specific embodiments, the battery housing 3 includes a battery frame 31 and a cold plate 32. The cold plate 32 is fixed on the battery frame 31 to form the bottom plate of the battery housing 3, and the cell 1 module is glued to the cold plate 32 through the second window area 12.

[0099] Specifically, the battery frame 31 is the main supporting structure of the battery casing 3, typically made of high-strength materials (such as aluminum alloy or steel). It provides physical protection and supports the installation of other components (such as the battery cell 1, connector 2, etc.). The cold plate 32 is fixed to the battery frame 31, forming the base plate of the battery casing 3. The cold plate 32 not only serves as the mounting base for the battery cell 1 module but also plays a crucial role in heat dissipation. For example, the cold plate 32 typically contains cooling channels through which coolant (such as a water-glycol mixture) can circulate, effectively dissipating the heat generated during the operation of the battery cell 1.

[0100] In actual production, the cold plate 32 can be fixed to the battery frame 31 by welding, bolts, or other mechanical connections. This connection structure ensures tight contact between the cold plate 32 and the battery frame 31, preventing any loosening or displacement and providing stable support. When the cell 1 module is assembled into the battery casing 3, it is firmly bonded to the cold plate 32 through the second window area 12. This bonding method not only improves the connection strength between the cell 1 module and the cold plate 32 but also facilitates heat conduction, allowing the heat generated by the cell 1 to be quickly transferred to the cold plate 32 and dissipated through the cooling system.

[0101] This robust bonding between cell 1 module and cold plate 32 significantly improves the mechanical stability of the entire battery pack. The cold plate 32 not only serves as a mounting base but also effectively dissipates heat generated during cell 1 operation, ensuring the battery pack's operating temperature remains within a safe range. Furthermore, this design simplifies the production process, reduces the number of components, and improves assembly efficiency.

[0102] According to some embodiments of the present invention, both the first window area 11 and the second window area 12 are filled with adhesive, and the adhesive does not overflow.

[0103] It should be noted that if the window area is not completely filled with adhesive, moisture or other contaminants may enter, leading to corrosion or insulation failure of cell 1. Completely filling the window area with adhesive effectively prevents moisture and other contaminants from entering, protecting cell 1 from corrosion.

[0104] Furthermore, when the first window area 11 and the second window area 12 are completely filled with adhesive, the connection between the battery cells 1 and the connection between the battery cells 1 and the battery casing 3 are ensured to be more secure. Simultaneously, when the adhesive completely fills the second window area 12 and is in close contact with the cold plate 32, it acts as an effective heat transfer medium, helping to quickly transfer the heat generated by the battery cells 1 to the cold plate 32 and dissipate it through the cooling system. This effectively reduces the operating temperature of the battery cells 1, extends their service life, and improves the overall performance of the battery pack.

[0105] It should also be noted that if too much adhesive is applied, the excess adhesive may cause stress concentration when the cell 1 is subjected to vibration, especially at the weld seams of the cell casing, potentially leading to leakage of the cell 1. In this embodiment, when the first window area 11 and the second window area 12 are filled with an appropriate amount of adhesive without overflowing, the additional weight and volume increase caused by excessive adhesive can be avoided. An appropriate amount of adhesive can be evenly distributed within the window areas, forming a uniform pressure distribution, thereby reducing the possibility of local stress concentration. This uniform distribution can also improve the reliability of the connection and avoid structural failure caused by uneven stress.

[0106] It is understandable that the weld seams of the battery cell casing are often one of the weakest parts in the manufacturing process. If too much adhesive is applied, especially near the weld seam, vibration may cause the adhesive to exert additional pressure on the weld seam, thereby increasing the risk of weld seam cracking. Once the weld seam cracks, it may lead to electrolyte leakage, which in turn causes serious safety hazards. This embodiment effectively protects the integrity of the weld seam and reduces the risk of electrolyte leakage from battery cell 1 by precisely controlling the amount of adhesive used, ensuring that it does not cover the weld seam or exert additional pressure on it.

[0107] Furthermore, applying the right amount of adhesive not only facilitates mechanical connections but also ensures electrical insulation performance. If too much adhesive is applied and spills into undesignated areas, it may cause accidental contact between cells, increasing the risk of a short circuit. Applying the right amount of adhesive can prevent this from happening.

[0108] In some specific embodiments, the area of ​​the second window area 12 is greater than or equal to one-third of the bottom area of ​​the cell 1. In this way, the larger bonding area can significantly improve the mechanical connection strength between the cell 1 and the battery casing 3 (such as the cold plate 32), ensuring that the cell 1 module is more firmly fixed in the battery pack.

[0109] In some specific embodiments, the total area of ​​two adjacent first window areas 11 is greater than one-third of the area of ​​their corresponding partial connector 2 and less than two-thirds of the area of ​​connector 2.

[0110] In this way, by ensuring that the total area of ​​the two adjacent first window areas 11 is greater than one-third of the area of ​​the connector 2, sufficient bonding area can be guaranteed, thereby providing strong mechanical connection strength. On the other hand, controlling the total area to within two-thirds of the area of ​​the connector 2 avoids problems caused by excessive adhesive usage.

[0111] At the same time, an appropriate bonding area helps to achieve a uniform stress distribution. If the bonding area is too small, local stress concentration may lead to connection failure; while if the bonding area is too large, it may lead to uneven stress and material waste. Therefore, this design can find a balance between the two to ensure optimal stress distribution.

[0112] like Figure 4 As shown, according to some embodiments of the present invention, multiple battery cells 1 are pressurized into the battery pack, and a shrinkable expansion material 5 is designed between adjacent battery cells 1 to ensure that the battery cells 1 are inserted into the battery pack and resist EOL expansion force, thereby improving the cycle life of the battery pack.

[0113] A specific embodiment of the battery pack of this utility model is described below with reference to the accompanying drawings.

[0114] like Figures 1 to 7As shown, the utility model provides a CTP battery pack structure. The size of the battery cell 1 is 148 mm in length, 55 mm in width, and 100 mm - 120 mm in height. The size of the second window area 12 at the bottom of the battery cell 1 is 80 mm x 20 mm, and the size of the first window area 11 at the top is 40 mm x 5 mm. An explosion-proof valve 15 structure is designed at the top of the battery cell 1, and two first window areas 11 are designed at the same time. The explosion-proof valve 15 is designed in the middle. And the two first window areas 11 on the left and right sides of the battery cell 1 are symmetrically designed.

[0115] The gluing areas of the second window areas 12 at the bottoms of two adjacent battery cells 1 are S1 and S2 respectively. To ensure sufficient bonding strength and avoid stress concentration, it is required that both S1 and S2 are greater than or equal to one-third of the total area at the bottom of the battery cell 1. Assuming the bottom area of the battery cell 1 is 148 mm x 55 mm, then S1 and S2 should meet the following conditions: S1≥(1 / 3)x(148 x 55), S2≥(1 / 3)x(148 x 55).

[0116] The gluing areas of the first window areas 11 at the tops of two adjacent battery cells 1 are S3 and S4 respectively. To ensure that the connector 2 can firmly fix the battery cell 1 and avoid weld cracking caused by stress concentration, it is required that the sum of S3 and S4 meets the following conditions: (1 / 3)x S0 < S3 + S4 < (2 / 3)x S0. Where S0 is the area of the corresponding part of the connector 2, specifically 40 mm x 55 mm.

[0117] Furthermore, the optional range of the specific dimensions of the above structure is as follows:

[0118] The length c of the first window area 11 of one of the battery cells 1: 40 mm ≤ c ≤ 45 mm;

[0119] The width d of the first window area 11 of one of the battery cells 1: 5 mm ≤ d ≤ 15 mm;

[0120] The length e of the first window area 11 of another adjacent battery cell 1: 40 mm ≤ e ≤ 45 mm;

[0121] The width f of the first window area 11 of another adjacent battery cell 1: 5 mm ≤ f ≤ 15 mm;

[0122] The length a of the second window area 12: 80 mm ≤ a ≤ 100 mm;

[0123] The width b of the second window area 12: 20 mm ≤ b ≤ 35 mm.

[0124] The bottom adhesive coating needs to completely cover the first window area 11 and the second window area 12 to meet the insulation requirements of the battery pack. The bottom adhesive coating area should be greater than or equal to one-third of the total bottom area. The top adhesive coating also needs to cover the first window area 11 and the second window area 12, and ensure that the sum of the adhesive coating areas of the top window areas of the two rows of cells 1 meets the following condition: (1 / 3) x S0 <S3+S4<(2 / 3)x S0。

[0125] It should be explained that when the adhesive coating area is less than (1 / 3)*S0, there is a risk of delamination, while when it is greater than or equal to (2 / 3)xS0, it may cause stress concentration at the weld seam of the battery cell casing, thereby causing the risk of leakage.

[0126] To ensure the battery pack design meets requirements, all coated areas must satisfy the aforementioned area requirements. If any area fails to meet the coating requirements, it is considered unqualified and must be readjusted until the design requirements are met. Table 1 below shows the specific design parameters for the battery pack based on this invention.

[0127] Table 1

[0128]

[0129]

[0130] In summary, the battery pack of this utility model eliminates the cable ties and related structures of traditional CTP. The battery cell 1 adopts a double-row or multi-row overpressure box structure design, and heat insulation buffer material is designed between adjacent rows of battery cells 1. Each battery cell 1 adopts a bottom window and shoulder window structure design. Through the bottom adhesive coating and top pressure strip adhesive coating structure design, multiple battery cells 1 are combined into a rigid battery cell 1 module. The battery cell 1 module is connected to the battery pack shell through bottom adhesive coating, which improves the structural strength of the battery pack and meets the requirements of insulation and adhesive coating reliability connection.

[0131] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery pack, characterized in that, include: Multiple battery cells (1), each of which has a recessed first window area (11) on the top edge, the first window area (11) being used for applying adhesive; A plurality of connectors (2) are attached to the first window area (11) of two adjacent cells (1) respectively on opposite sides, and a plurality of cells (1) are connected by a plurality of connectors (2) to form a cell (1) module. Battery housing (3), wherein the battery cell (1) module is glued to the bottom of the battery housing (3).

2. The battery pack according to claim 1, characterized in that, The battery cell (1) includes a battery cell (1) shell and an insulating layer (13) wrapped around the surface of the battery cell (1) shell. The insulating layer (13) located at the top of the battery cell (1) is provided with a window to form the first window area (11), and the adhesive is applied to the battery cell (1) shell located at the bottom of the first window area (11).

3. The battery pack according to claim 2, characterized in that, The plurality of said cells (1) are divided into at least two groups of cells (1) arranged along a first direction, each group of cells (1) includes at least two said cells (1) arranged along a second direction, and adjacent groups of cells (1) are connected by said connector (2), wherein the first direction is perpendicular to the second direction.

4. The battery pack according to claim 3, characterized in that, Each of the battery cells (1) has two first window areas (11) on its top; wherein, along the first direction, the two first window areas (11) are located on opposite sides of the top of the battery cell (1), and both first window areas (11) extend along the second direction.

5. The battery pack according to claim 4, characterized in that, The two first window areas (11) are arranged symmetrically along the center of the cell (1).

6. The battery pack according to claim 4, characterized in that, The first window area (11) on different cells (1) within the same group of cells (1) is positioned opposite to each other and extends along the second direction; The connector (2) has a first connecting side (21) and a second connecting side (22). The first connecting side (21) and the second connecting side (22) are arranged opposite to each other along the first direction and both extend along the second direction. The first connecting side (21) and the second connecting side (22) are respectively bonded to the first window area (11) of two adjacent sets of battery cells (1).

7. The battery pack according to claim 6, characterized in that, The bottom of the connector (2) is also connected to a partition (4), which is sandwiched between two adjacent sets of cells (1) and extends toward the bottom of the battery casing (3). The first connecting side (21) and the second connecting side (22) are respectively located on both sides of the partition (4) along the first direction.

8. The battery pack according to any one of claims 2 to 7, characterized in that, Each of the battery cells (1) has a recessed second window area (12) formed at its bottom. The insulating layer (13) located at the bottom of the battery cell (1) is provided with a window to form the second window area (12), and the adhesive is applied to the battery cell (1) casing located at the bottom of the second window area (12).

9. The battery pack according to claim 8, characterized in that, The battery housing (3) includes a battery frame (31) and a cold plate (32). The cold plate (32) is fixed on the battery frame (31) to form the bottom plate of the battery housing (3). The cell (1) module is glued to the cold plate (32) through the second window area (12).

10. The battery pack according to claim 8, characterized in that, The area of ​​the second window area (12) is greater than or equal to one-third of the bottom area of ​​the battery cell (1).

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