Battery pack and energy storage cabinet

Abstract

The present disclosure belongs to the technical field of batteries. Provided are a battery pack and an energy storage cabinet. The battery pack comprises: a housing and a plurality of columns of battery cells accommodated inside the housing, wherein the plurality of columns of battery cells are arranged side by side in the direction of width of the battery pack, and a plurality of battery cells included in each column are arranged in the direction of length of the battery pack; a first separator is provided between every two adjacent battery cells arranged side by side in the direction of width of the battery pack, two opposite surfaces of the first separator being fixedly bonded to the side surfaces of the two battery cells, respectively; the surfaces of the plurality of columns of battery cells that are close to the side wall and bottom wall of the housing are fixedly bonded to the side wall and bottom wall of the housing, respectively. The battery pack has improved structural rigidity whilst also making full use of the internal space of the battery. Moreover, the number of components in the battery pack is reduced, the structure is simplified, and the integration level of the battery pack is higher, such that both the space utilization rate and energy density of the battery pack are improved.

Description

Battery pack and energy storage cabinet

[0001] This application claims priority to Chinese Patent Application No. 202422708128.5, filed on November 6, 2024, entitled “Battery Pack and Energy Storage Cabinet”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to the field of battery technology, and particularly to battery packs and energy storage cabinets. Background Technology

[0003] Currently, in order to improve battery space utilization and energy density, battery packs are gradually evolving from CTM (Cell to Module) structure to CTP (Cell to Pack) structure. The CTP structure reduces or eliminates battery modules, directly installing the cells into the battery pack casing, thus enabling the battery pack to achieve higher integration and higher space utilization.

[0004] The CTP (Cell-to-Pack) battery pack provided by related technologies involves stacking multiple cells in a predetermined direction to form a cell stack, which is then placed inside a housing. Furthermore, a support beam is installed at the bottom of the housing to enhance its structural rigidity. However, the use of the support beam still occupies a significant amount of space, reducing space utilization. Therefore, the space utilization rate of the battery pack still needs improvement. Summary of the Invention

[0005] This disclosure provides a battery pack and energy storage cabinet, which can solve the technical problems existing in related technologies. Specifically, the technical solution is as follows.

[0006] On one hand, this disclosure provides a battery pack, the battery pack including: a housing and multiple rows of battery cells housed inside the housing, the multiple rows of battery cells being arranged side by side along the width direction of the battery pack, and each row of battery cells including multiple battery cells being arranged along the length direction of the battery pack; a first partition is provided between two adjacent battery cells arranged side by side along the width direction of the battery pack, the two opposite surfaces of the first partition being fixedly bonded to the side surfaces of the two battery cells respectively, and the surfaces of the multiple rows of battery cells near the side wall and bottom wall of the housing being fixedly bonded to the side wall and bottom wall of the housing respectively.

[0007] The battery pack provided in this disclosure uses a first separator to fix and bond multiple cells arranged side-by-side along the width direction of the battery pack. Based on the first separator, the multiple cells mutually constrain each other along the width direction of the battery pack to form a battery assembly. This structural form of the battery assembly gives it high structural rigidity and can act as a structural reinforcing beam to improve the structural rigidity of the battery pack. Furthermore, the sidewalls and bottom walls of the multiple rows of cells near the casing are fixedly bonded to the sidewalls and bottom walls of the casing, respectively. This allows the multiple rows of cells to transfer more load to the sidewalls of the casing rather than the bottom wall, significantly reducing the strength requirements of the bottom wall and avoiding the need for an additional support beam structure at the bottom of the battery pack. While meeting the structural rigidity requirements of the battery pack, this fully utilizes the internal space of the battery, significantly improving the space utilization rate of the battery pack. Moreover, the number of battery pack components is reduced, the structure is simplified, and the battery pack integration is higher, which also helps to improve the energy density of the battery pack.

[0008] In some possible implementations, multiple first partitions are provided between adjacent rows of cells in the multi-row battery pack, and one first partition is provided between each pair of cells arranged side by side in the width direction of the battery pack. Multiple cells arranged side by side along the width direction of the battery pack can form a cell group. Any two adjacent cell groups in the length direction of the battery pack are independent and do not share first partitions. This allows for easy inversion of lighter individual cell groups during battery pack assembly, followed by sequential stacking and inversion of multiple cell groups, thereby assembling all cells in the battery pack and significantly reducing assembly difficulty, thus simplifying the battery pack manufacturing process.

[0009] In some possible implementations, one or more first separators are provided between adjacent rows of cells in the multi-row battery pack, and at least some adjacent cells among the multiple cells arranged along the length of the battery pack are fixedly bonded to one of the first separators. It is evident that the first separator in the battery pack is shared by multiple cells arranged along the length of the battery pack, and this approach is more advantageous for enhancing the structural rigidity of the battery pack.

[0010] For the above implementation, exemplarily, along the length direction of the battery pack, the length of the first separator is greater than the length of a single battery cell, and less than or equal to the sum of the lengths of a plurality of adjacent battery cells along the length direction of the battery pack.

[0011] In some possible implementations, a second separator is provided between two adjacent cells along the length of the battery pack, and multiple adjacent cells arranged side-by-side along the width of the battery pack are fixedly bonded to the same second separator. By ensuring that multiple adjacent cells arranged side-by-side along the width of the battery pack are all fixedly bonded to the same second separator, it is beneficial to avoid bonding failure between the cells and the first separator, thereby ensuring that the structural rigidity of the battery pack can be stably maintained.

[0012] For example, in the width direction of the battery pack, the length of the second separator is greater than the length of a single battery cell, and less than or equal to the length of a plurality of adjacent battery cells in the width direction.

[0013] In some possible implementations, both the first and second separators are insulating plates to ensure insulation between any two adjacent cells and improve the safety of the battery pack. For example, the first separator is a rigid insulating separator to better transmit force, and the second separator is a flexible insulating separator to absorb the expansion and deformation of the cells and assembly tolerances.

[0014] In some possible implementations, the first separator covers part of the side of the battery cell. When the first separator covers part of the side of the battery cell, it not only ensures the improvement of the structural rigidity of the battery pack, but also helps to reduce the amount of the first separator used, making it lighter and reducing costs, and also facilitates the flexible placement of the first separator on the side of the battery cell.

[0015] For example, in the above implementation, the first partition has openings, or the first partition includes a plurality of spaced sub-partitions.

[0016] In some possible implementations, the housing includes: a top cover, a bottom plate, two side plates, and two end plates; the two side plates are opposite each other along the width direction of the battery pack, and the two end plates are opposite each other along the length direction of the battery pack, the two side plates and the two end plates cooperating to form a frame; the top cover is fixedly connected to the top of the frame to close the top opening of the frame, and the bottom plate is fixedly connected to the bottom of the frame to close the bottom opening of the frame; the depth of the top cover in the height direction of the battery pack is less than the depth of the frame.

[0017] As can be seen, the casing is a high box structure, and the top cover can be in the form of a cover or a plate. By fixing and connecting the various components of the casing separately, it is more advantageous in terms of assembly process feasibility and assembly cost, which helps to reduce the assembly difficulty of the battery pack and makes the assembly process more flexible.

[0018] For example, in accordance with the above implementation method, the connection position of any two of the top cover, the bottom plate, the two side plates, and the two end plates is covered with sealant. The sealant is used to seal the connection gap, thereby ensuring the airtightness of the inner cavity of the shell. Good sealing helps to reduce condensation, reduce fire, and reduce heat diffusion, etc.

[0019] For example, in the above implementation, a liquid cooling pipe is provided inside the base plate, and the surfaces of the multiple rows of battery cells closest to the base plate are bonded to the base plate using thermally conductive structural adhesive. The thermally conductive structural adhesive possesses both excellent structural strength and thermal conductivity, which facilitates more efficient heat transfer between the liquid cooling pipes, the base plate of the housing, and the multiple rows of battery cells, reducing heat loss.

[0020] For the above implementation, exemplarily, for each of the two side plates, the side plate further includes: a first bent portion located at the bottom end of the side plate in the height direction and a second bent portion located at the top end of the side plate, the first bent portion extending toward the inner cavity of the housing and being fixedly connected to the bottom surface of the base plate; the second bent portion extending toward the outer cavity of the housing and being fixedly connected to the top cover.

[0021] By connecting the first bend to the bottom surface of the base plate, the contact area between the side plate and the base plate is increased, which improves the sealing between them (e.g., by applying sealant between the first bend and the base plate). Furthermore, the first bend supports the base plate, acting as a support beam. Multiple rows of cells transfer the load to the side plate, and then to the first bend, reducing the rigidity requirement of the base plate. Compared to related technologies, this eliminates the need for an additional support frame, improving the structural rigidity of the battery pack while reducing the number and weight of components. Moreover, when the battery pack moves on the slide, the first bend can bear the load instead of the base plate, further reducing the rigidity requirement of the base plate.

[0022] By connecting the second bend to the bottom surface of the top cover, the contact area between the side panels and the top cover is increased, which is more beneficial for improving the sealing between the top cover and the side panels. For example, sealant can be applied between the second bend and the top cover.

[0023] In some possible implementations, the first separator is arranged in multiple rows along the width direction of the battery pack, and the two end plates are fixedly connected to the ends of at least some of the first separators in the multiple rows, which helps to further improve the structural rigidity of the battery pack.

[0024] On the other hand, an energy storage cabinet is provided, the energy storage cabinet comprising: a plurality of battery packs as described above, the plurality of battery packs being stacked in the height direction of the energy storage cabinet.

[0025] The energy storage cabinet provided in this embodiment has all the advantages of the battery pack described in this embodiment, and will not be repeated here.

[0026] Since the battery pack provided in this embodiment has high structural rigidity and low strength requirements for the base plate of the battery pack housing, while the static energy storage cabinet has low strength requirements for the base plate of the battery pack housing, in some examples, the energy storage cabinet involved in this embodiment can be a static energy storage cabinet. Attached Figure Description

[0027] Figure 1 is a top cross-sectional view of a first exemplary battery pack provided in an embodiment of this disclosure;

[0028] Figure 2 is a front view of the battery pack shown in Figure 1;

[0029] Figure 3 is a diagram showing the combination of multiple battery cells arranged side by side along the width direction of the battery pack according to an embodiment of this disclosure;

[0030] Figure 4 is a schematic diagram of the structure of an exemplary battery cell provided in an embodiment of this disclosure;

[0031] Figure 5 is an exploded view of two battery cells arranged side by side along the width direction of the battery pack according to an embodiment of this disclosure;

[0032] Figure 6 is an assembly and exploded view of some of the battery cells in the battery pack provided in the embodiments of this disclosure;

[0033] Figure 7 is a top cross-sectional view of a second exemplary battery pack provided in an embodiment of this disclosure;

[0034] Figure 8 is a top cross-sectional view of a third exemplary battery pack provided in an embodiment of this disclosure;

[0035] Figure 9 is a top cross-sectional view of the fourth exemplary battery pack provided in the embodiments of this disclosure;

[0036] Figure 10 is a schematic diagram of an exemplary split partition provided in an embodiment of this disclosure;

[0037] Figure 11 is a diagram showing the arrangement of a series of solid partitions on the side of the battery cell according to an embodiment of this disclosure;

[0038] Figure 12 is a diagram showing the arrangement of a series of hollowed-out partitions on the side of the battery cell according to an embodiment of this disclosure;

[0039] Figure 13 is a diagram showing the arrangement of a series of sub-separator combinations on the side of the battery cell according to an embodiment of this disclosure;

[0040] Figure 14 is an isometric view of an exemplary battery pack provided in an embodiment of this disclosure;

[0041] Figure 15 is a partial structural diagram of the battery pack shown in Figure 14 after the top cover has been removed.

[0042] Figure 16 is a partial enlarged view of the battery pack shown in Figure 14;

[0043] Figure 17 is a front view of an exemplary battery pack provided in an embodiment of this disclosure.

[0044] The reference numerals in the attached drawings represent: 1. Shell; 11. Top cover; 12. Bottom plate; 13. Side plate; 1301. Side plate portion; 1302. First bend portion; 1303. Second bend portion; 14. End plate; 2. Cell; 201. Positive terminal; 202. Negative terminal; 20. Cell assembly; 3. First separator; 30. Sub-separator; 31. Core plate; 32. Adhesive layer; 33. Opening; 4. Second separator; 5. Colloid. Detailed Implementation

[0045] In the description of the embodiments of this disclosure, it should be understood that the terms "top", "bottom", "upper", "lower", "inner", "outer", "length", "thickness", "width", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. The orientation may change when the product is placed in different postures, and therefore should not be construed as a limitation on the embodiments of this disclosure.

[0046] Currently, although the space utilization rate of CTP structure battery packs has improved compared to CTM structure battery packs, there is still room for improvement. It can be seen that both CTM structure battery packs and the later CTP structure battery packs have the problem of low space utilization, which leads to low energy density.

[0047] To address these technical problems, this disclosure provides a battery pack that, while ensuring excellent structural rigidity, also boasts higher space utilization. Figure 1 illustrates a top sectional view of the battery pack, Figure 2 illustrates a front view of the battery pack, and Figure 3 illustrates an assembly diagram of multiple battery cells arranged side-by-side along the width direction of the battery pack. As shown in Figures 1-3, the battery pack includes: a housing 1 and multiple rows of battery cells 2 housed within the housing 1. The multiple rows of battery cells 2 are arranged side-by-side along the width direction of the battery pack, and each row of battery cells 2 comprises multiple battery cells 2 arranged along the length direction of the battery pack.

[0048] Regarding the arrangement of the multiple rows of battery cells 2 in the housing 1, please further refer to Figure 4. Figure 4 illustrates the structure of the battery cell 2 in this embodiment when it is a square battery cell. As shown in Figure 4, the length of the battery cell 2 extends along the X-axis, the width along the Y-axis, and the height along the Z-axis. The battery cell 2 has two opposite side surfaces and two opposite large surfaces, and the side surfaces and large surfaces of the battery cell 2 are arranged adjacent to each other. Here, "side surface of battery cell 2" refers to the surface defined by the side containing the width of battery cell 2 and the side containing the height of battery cell 2. Here, "large surface of battery cell 2" refers to the surface defined by the side containing the length of battery cell 2 and the side containing the height of battery cell 2.

[0049] In the embodiments of this disclosure, multiple rows of battery cells 2 arranged side-by-side along the width direction of the battery pack are arranged such that the sides of any two adjacent battery cells 2 are opposite to each other. In each row of battery cells 2 arranged along the length direction of the battery pack, the larger faces of any two adjacent battery cells 2 are opposite to each other.

[0050] Referring further to Figure 4, a positive terminal 201 and a negative terminal 202 are provided on the surface of the cell 2 defined by its length side and width side. In this embodiment of the present disclosure, the surface where the positive terminal 201 and the negative terminal 202 are located in the cell 2 is defined as the top surface (i.e., top wall) of the cell 2. Correspondingly, the top wall of the cell 2 faces the top wall of the housing 1, the bottom wall of the cell 2 faces the bottom wall of the housing 1, and the side surface and the large surface of the cell 2 face the side wall of the housing 1, respectively.

[0051] Specifically, as shown in Figures 1 and 5, a first partition 3 is provided between two adjacent cells 2 arranged side-by-side along the width direction of the battery pack. The two opposite surfaces of the first partition 3 are fixedly bonded to the sides of the two adjacent cells 2, respectively. Furthermore, the surfaces of the multiple rows of cells 2 closest to the sidewalls and bottom walls of the housing 1 are fixedly bonded to the sidewalls and bottom walls of the housing 1, respectively. This not only helps to improve the structural rigidity of the battery pack but also significantly reduces the space utilization rate of the battery pack, for the following reasons:

[0052] For multiple rows of cells 2 arranged side by side along the width direction of the battery pack, any two adjacent cells 2 are fixedly bonded together by the first partition 3, so that the multiple cells 2 arranged side by side along the width direction of the battery pack form an integrated cell group 20 (wherein, Figure 3 illustrates one row of cells 2 arranged side by side along the width direction of the battery pack, and the four cells 2 in this row form a cell group 20 based on the first partition 3).

[0053] In this cell assembly 20, the lengths of multiple cells 2 are superimposed, resulting in a relatively long cell assembly 20. Furthermore, the multiple cells 2 are mutually constrained, and the forces between them are transmitted through the first partition 3. Thus, the cell assembly 20 bears load and stress based on its long casing structure, thereby increasing its structural rigidity compared to a single cell 2. Furthermore, when the cell assembly 20 is assembled into the casing 1 of the battery pack, and the surfaces of the cells 2 closest to the casing 1 are fixedly bonded to the side and bottom walls of the casing 1, the long length and high structural rigidity of the cell assembly 20 allow it to act as a structural reinforcing beam for the battery pack, thereby improving the overall structural rigidity of the battery pack. On the other hand, the force exerted by the cell assembly 20 on the housing 1 can be transmitted sequentially to the two side walls of the housing 1 distributed along the width direction through the multiple mutually constrained cells 2. This means that the force exerted by the cell assembly 20 on the housing 1 is no longer concentrated on the bottom wall of the housing 1, but is partially distributed to the side walls of the housing 1. Thus, the cell assembly 20 exerts force on both the side walls and the bottom wall of the housing 1 at the same time, making the force on the housing 1 more dispersed and reducing the strength requirements of the housing 1. In particular, it reduces the strength requirements of the bottom wall of the housing 1, thereby eliminating the need to set up an additional support beam structure at the bottom of the battery pack, which is particularly beneficial for improving the space utilization of the battery pack.

[0054] In related technologies, along the width of the battery pack, multiple cells are arranged independently of each other, making it impossible for these cells to transmit force to each other, let alone to the side walls of the casing. Each cell exerts force on the bottom wall of the casing based on its own gravity, meaning each cell transmits the load to the bottom wall of the casing. This requires the bottom wall of the casing to be strong enough. Therefore, support beams are usually set at the bottom of multiple cells to provide reinforcement. The use of support beams reduces the space utilization of the battery pack.

[0055] The battery pack disclosed in this embodiment, with its cell assembly 20 based on multiple mutually constrained cells 2, transfers more load to the side walls of the housing 1 rather than the bottom wall of the housing 1. This significantly reduces the strength requirements on the bottom wall of the housing 1, avoiding the need for an additional support beam structure at the bottom of the battery pack, thereby improving the space utilization of the battery pack. Furthermore, since the cell assembly 20 itself has high structural rigidity and can serve as a structural reinforcing beam for the battery pack, it can meet the structural rigidity requirements of the battery pack, ensuring sufficient structural strength while improving the space utilization of the battery pack.

[0056] In summary, the battery pack provided in this embodiment of the present disclosure, by fixing and bonding a first partition 3 between multiple battery cells 2 arranged side by side along the width direction of the battery pack, allows the multiple battery cells 2 to constrain each other along the width direction of the battery pack and form a battery pack 20. This structural form of the battery pack 20 gives it high structural rigidity and can serve as a structural reinforcing beam to improve the structural rigidity of the battery pack. Furthermore, the surfaces of the multiple rows of battery cells 2 closest to the sidewalls and bottom walls of the housing 1 are fixedly bonded to the sidewalls and bottom walls of the housing 1, respectively. This allows the multiple rows of battery cells 2 to transfer more load to the sidewalls of the housing 1 rather than the bottom wall, significantly reducing the strength requirement of the bottom wall of the housing 1. This avoids the need for an additional supporting beam structure at the bottom of the battery pack, fully utilizing the internal space of the battery while meeting the structural rigidity requirements of the battery pack, significantly improving the space utilization rate of the battery pack. Moreover, the number of battery pack components is reduced, the structure is simplified, and the battery pack integration is higher, which also helps to improve the energy density of the battery pack.

[0057] Compared to the CTP structure in related technologies where multiple cells 2 directly form a battery pack, the battery pack provided in this disclosure avoids the need for reinforcing support beams at the bottom of multiple cells 2, reducing the number of components, simplifying the structure, improving space utilization, and lowering weight and cost. Calculations show that, compared to a traditional CTP structure battery pack, the weight of the non-cell portion of the battery pack provided in this disclosure is reduced by approximately 50%.

[0058] Compared with the CTM structure scheme in related technologies, which consists of multiple cells 2 forming a battery module and then forming a battery pack, the battery pack provided in this disclosure avoids arranging end plates on the large surfaces of the two outermost cells 2, thus reducing the number of components, simplifying the structure, improving space utilization, and reducing weight and cost.

[0059] As mentioned above, along the width direction of the battery pack, a first partition 3 is fixedly bonded between the sides of any two adjacent cells 2. The first partition 3 is fixedly bonded to the side of the cell 2 and maintains surface-to-surface contact, so that the force can be transmitted between two adjacent cells 2 through the first partition 3.

[0060] In some examples, the first separator 3 has the characteristic of bearing pressure and transmitting the pressure to the battery cell 2 bonded to it. For example, the compressive strength of the first separator 3 is greater than or equal to 1 MPa, so that the deformation of the first separator 3 under pressure meets the operating conditions and design requirements. Further, the compressive strength of the first separator 3 is greater than or equal to 2 MPa, 3 MPa, 4 MPa, 5 MPa, 6 MPa, 7 MPa, 8 MPa, 9 MPa, 10 MPa, 11 MPa, 12 MPa, 13 MPa, 14 MPa, 15 MPa, 16 MPa, 17 MPa, 18 MPa, 19 MPa, 20 MPa, 25 MPa, 30 MPa, 35 MPa, 40 MPa, 45 MPa, 50 MPa, 55 MPa, 60 MPa, 65 MPa, 70 MPa, 75 MPa, 80 MPa, 85 MPa, 90 MPa, 100 MPa, etc.

[0061] In some examples, the first partition 3 is made of a rigid material, and therefore, it does not have the ability to deform. In other examples, the first partition 3 can deform appropriately (the amount of deformation is controlled within a set range) to release some stress. For example, the deformation rate of the first partition 3 is less than 10%, and further, less than 5%, for example, it can be 3%. In this way, during the thermal runaway of the battery cell 2, the first partition 3 is less likely to break due to the load or expansion of the battery cell 2, ensuring stable force transmission while effectively preventing direct contact between the sides of two adjacent battery cells 2.

[0062] To enhance the safety of the battery pack, at least the surface of the first separator 3 that contacts the cell 2 should be insulated. Furthermore, the first separator 3 can also be made entirely insulated. In some examples, the insulation resistance of the two side plates of the first separator 3 is greater than or equal to 10000Ω / mm. For the first separator 3 that is entirely insulated, the insulation resistance of the first separator 3 itself can be greater than or equal to 10000Ω / mm.

[0063] In order to curb the heat transfer between two adjacent cells 2 through the first partition 3, the embodiments of this disclosure may also make the first partition 3 have heat insulation properties to avoid rapid heat transfer. In this way, when one of the cells 2 thermally runs away, the high temperature generated can be thermally blocked by the first partition 3, and will not be rapidly transferred to the cell 2 adjacent to the thermally runaway cell 2, thereby causing heat diffusion.

[0064] To meet the heat insulation requirements of the first separator 3, in some examples, the thermal conductivity of the first separator 3 in the normal direction along the side of the cell 2 can be less than or equal to 1 W / K·m. Further, this thermal conductivity can be less than or equal to the following values: 0.8 W / K·m, 0.75 W / K·m, 0.7 W / K·m, 0.65 W / K·m, 0.6 W / K·m, 0.55 W / K·m, 0.5 W / K·m, 0.45 W / K·m, 0.4 W / K·m, 0.35 W / K·m, 0.3 W / K·m, 0.25 W / K·m, 0.2 W / K·m, 0.15 W / K·m, 0.1 W / K·m, etc.

[0065] Furthermore, in the event of thermal runaway of cell 2, it is desirable that the first separator 3 can withstand the high temperature under thermal runaway conditions to prevent the first separator 3 from melting or even breaking at high temperatures, thereby causing the isolation structure to fail. In this embodiment, it is also desirable that the first separator 3 has temperature resistance characteristics. In some examples, the temperature resistance of the first separator 3 can be greater than or equal to 120°C. Further, the temperature resistance of the first separator 3 can be greater than or equal to the following values: 125°C, 130°C, 135°C, 140°C, 145°C, 150°C, 155°C, 160°C, 165°C, 170°C, 175°C, 180°C, 185°C, 190°C, 200°C, 300°C, 400°C, 500°C, 600°C, 700°C, 800°C, 900°C, 1000°C, etc.

[0066] The type of first separator 3 is selected based on the strength and temperature resistance requirements of the battery pack, thereby determining its shape, size, and material. For example, regarding the thickness of the first separator 3 (its dimension along the width direction of the battery pack), in order to meet the compressive strength and insulation requirements of the first separator 3, the thickness of the first separator 3 can be greater than or equal to 0.5mm. For instance, the thickness of the first separator 3 can be 0.5mm-5mm. This not only meets the compressive strength and insulation requirements but also avoids additional length increases for the cell assembly 20.

[0067] In this embodiment of the disclosure, some suitable materials for the first partition 3 include structural adhesive, rigid silicone foam, and polymer material sheets (e.g., epoxy sheets). For polymer material sheets, reinforcing fibers can be further incorporated to improve the strength, temperature resistance, etc. of the sheet.

[0068] As mentioned above, the first partition 3 is fixedly connected to the side of the cell 2 by adhesive bonding. For example, the bonding operation can be carried out using structural adhesive, double-sided adhesive, or other adhesives with insulating properties. When structural adhesive is used for bonding, the cured structural adhesive can serve as the first partition 3.

[0069] In order to obtain the desired bonding strength and prevent bonding failure due to expansion of the cell 2 or excessive load, in some examples, the tangential bonding strength between the first separator 3 and the side of the cell 2 is greater than or equal to 0.3 MPa. Further, the bonding strength is greater than or equal to 0.4 MPa, 0.5 MPa, 1 MPa, 0.7 MPa, 0.8 MPa, 0.9 MPa, 1 MPa, 2 MPa, 3 MPa, 4 MPa, 5 MPa, 6 MPa, 7 MPa, 8 MPa, etc.

[0070] In the battery pack involved in the embodiments of this disclosure, a plurality of battery cells 2 arranged along the length direction of the battery pack can each be bonded to a first partition 3, or some of the battery cells 2 arranged along the length direction of the battery pack can share a first partition 3. The above solutions are described by way of example below.

[0071] Figure 1 illustrates a scheme in which multiple independent first separators 3 are set in a battery pack. In conjunction with Figure 1, in some examples (1), multiple first separators 3 are set between two adjacent rows of cells 2 in the multiple rows of cells 2. A first separator 3 is set between each pair of cells 2 arranged side by side in the width direction of the battery pack. At the same time, a first separator 3 is set for each of the multiple cells 2 arranged in the length direction of the battery pack.

[0072] As mentioned above, multiple cells 2 arranged side by side along the width direction of the battery pack can form a row of cell groups 20, and multiple rows of cell groups 20 are arranged sequentially along the length direction of the battery pack. Example (1) shows that any two adjacent cell groups 20 in the length direction of the battery pack are independent and do not share the first partition 3. The advantage of this arrangement is that the weight of a single cell group 20 is lighter than the total weight of all cells 2 in the battery pack. In this way, when assembling the battery pack, the lighter single cell group 20 can be easily flipped, and then multiple cell groups 20 can be stacked and flipped sequentially to achieve the assembly of all cells 2 in the battery pack, which significantly reduces the assembly difficulty and simplifies the battery pack manufacturing process.

[0073] Figure 7 illustrates that for each row of cells 2, multiple first separators 3 are arranged along the length of the battery pack, and the multiple first separators 3 are shared by adjacent cells 2 in that row. Figure 8 illustrates that for each row of cells 2, one first separator 3 is arranged along the length of the battery pack, and this first separator 3 is shared by all cells 2 in that row.

[0074] Referring to Figures 7 and 8, in some examples (2), one or more first separators (3) are provided between two adjacent rows of cells 2 in the multi-row cell 2, and at least some adjacent cells 2 of the multiple cells 2 arranged in the length direction of the battery pack are fixedly bonded to a first separator 3. It can be seen that Example 2 illustrates a scheme in which the first separator 3 in the battery pack is shared by multiple cells 2 arranged in the length direction of the battery pack, which is more advantageous for enhancing the structural rigidity of the battery pack.

[0075] Furthermore, along the length of the battery pack, the length of the first separator 3 is greater than the length of a single battery cell 2, and less than or equal to the sum of the lengths of multiple adjacent battery cells 2 along the length of the battery pack. It should be noted that the length of the first separator 3 referred to here is its dimension along the length of the battery pack, and the length of the battery cell 2 also refers to its dimension along the length of the battery pack.

[0076] Figure 7 illustrates how some adjacent cells 2 of a plurality of cells 2 arranged along the length of a battery pack are fixedly bonded to a first separator 3. It can be seen that the length of the first separator 3 is greater than the length of a single cell 2, but less than the sum of the lengths of all adjacent cells 2 along the length of the battery pack. According to the scheme illustrated in Figure 7, along the length of the battery pack, the three rows of cells 2 on the left share one first separator 3, the three rows of cells 2 in the middle share another first separator 3, and the four rows of cells on the right share yet another first separator 3. Of course, other implementation methods are not excluded based on this layout concept. For example, for each row of cells 2, four, five, or other numbers of first separators 3 can be provided along the length of the battery pack. This type of scheme improves the structural rigidity of the battery pack while ensuring that the weight of the cell assembly structure composed of those cells 2 sharing the first separator 3 is not excessive, thus facilitating assembly.

[0077] Figure 8 illustrates a battery pack in which all the battery cells 2 arranged along its length are fixedly bonded to a first separator 3, thus forming an integral structure. This is more advantageous for enhancing the structural rigidity of the battery pack. Furthermore, in the scheme shown in Figure 8, the length of the first separator 3 is greater than the length of a single battery cell 2, and can be equal to the sum of the lengths of all adjacent battery cells 2 along the length of the battery pack.

[0078] In the battery pack disclosed in this embodiment, as shown in Figure 6, a second partition 4 is provided between two adjacent cells 2 along the length of the battery pack. The second partition 4 is fixedly bonded to the large surface of the two adjacent cells 2. For example, the second partition 4 is a flexible insulating partition, such as flexible foam or aerogel, which helps to absorb the expansion and deformation of the cells 2 and assembly tolerances.

[0079] In some examples, as shown in Figures 7 and 9, multiple adjacent cells 2 arranged side by side along the width of the battery pack are fixedly bonded to the same second separator 4.

[0080] For the battery pack, multiple rows of battery cells 2 are distributed along the length of the battery pack, and at least some rows of battery cells 2 are fixedly bonded to the same second separator 4. For example, Figure 7 illustrates multiple battery cells 2 in the third row from left to right being fixedly bonded to the same second separator 4, and multiple battery cells 2 in the sixth row being fixedly bonded to the same second separator 4. Of course, based on this concept, other arrangements are not excluded. Figure 9 illustrates that each row of battery cells 2 is fixedly bonded to the same second separator 4.

[0081] By fixing and bonding multiple adjacent cells 2 along the width direction of the battery pack to the same second separator 4, it is beneficial to avoid the failure of the bonding between the cells 2 and the first separator 3, thereby ensuring that the structural rigidity of the battery pack can be maintained stably.

[0082] Furthermore, in the width direction of the battery pack, the length of the second separator 4 is greater than the length of a single battery cell 2, and less than or equal to the length of a plurality of adjacent battery cells 2 in the width direction. It should be noted that the length of the second separator 4 referred to here refers to the dimension of the second separator 4 along the width direction of the battery pack, and the length of the battery cell 2 also refers to the dimension of the battery cell 2 along the width direction of the battery pack.

[0083] For example, Figure 9 illustrates that the length of the second separator 4 is less than the length of the multiple adjacent cells 2 in the width direction of the battery pack. There is a gap between the end of the second separator 4 and the side wall of the housing 1. Structural adhesive or other glue can be injected into the gap to achieve a fixed connection between the second separator 4 and the side wall of the housing 1.

[0084] As described above, both the first separator 3 and the second separator 4 can be insulating plates to ensure insulation between any two adjacent cells 2 and improve the safety of the battery pack. For example, the first separator 3 is a rigid insulating separator to better transmit force, and the second separator 4 is a flexible insulating separator to absorb the expansion deformation of the cell 2 and assembly tolerances.

[0085] The first separator 3 can be a multi-layer structure or a single-layer structure. An example of a multi-layer first separator 3 is a double-sided adhesive separator. Referring to Figure 10, the double-sided adhesive first separator 3 includes: a core plate 31 and an adhesive layer 32 stacked on opposite side surfaces of the core plate 31. The adhesive layer 32 bonds the first separator 3 to the side of the battery cell 2. For the multi-layer first separator 3, the core plate 31 offers greater flexibility in selection. Suitable materials, sizes, and structural forms of the core plate 31 can be selected according to actual needs to cater to different types of battery packs. For example, the core plate 31 can be a polymer material sheet.

[0086] The first partition 3 of the integrated structure can be a structural adhesive. In addition to achieving the bonding function, the structural adhesive can also withstand strong pressure, thereby transmitting force. The structural adhesive form of the first partition 3 is also beneficial to simplifying the assembly difficulty of the battery cell 2.

[0087] Regarding the bonding scheme of the first separator 3 on the side of the battery cell 2, the first separator 3 can cover the entire side of the battery cell 2, or it can cover part of the side of the battery cell 2. When the first separator 3 covers part of the side of the battery cell 2, while ensuring the improvement of the structural rigidity of the battery pack, it is also beneficial to reduce the amount of the first separator 3 used, making it lighter and reducing costs. In addition, it is beneficial to flexibly set the first separator 3 on the side of the battery cell 2 (for example, the first separator 3 can be omitted from those uneven positions on the side of the battery cell 2).

[0088] For example, the bonding area between the first separator 3 and the side of the cell 2 is greater than or equal to 20% and less than or equal to 95% of the side area of ​​the cell 2. Further, the bonding area is greater than or equal to 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, etc. of the side area of ​​the cell 2. The required bonding strength and the stress-bearing area of ​​the first separator 3 are determined according to the specifications and strength requirements of the battery pack.

[0089] In this embodiment, the orthographic projection of the first partition 3 onto the side surface of the battery cell 2 can either exactly cover the side surface of the battery cell 2 or be located within the area defined by the side surface of the battery cell 2, without needing to extend beyond the large and bottom surfaces of the battery cell 2. Based on this requirement, the first partition 3 can be connected (e.g., bonded) to any position on the side surface of the battery cell 2.

[0090] When the battery cell 2 is subjected to impact load or expands, the battery cell 2 will be subjected to corresponding force. Under normal circumstances, the force on different areas of the battery cell 2 may be different. For example, the edge area of ​​the battery cell 2 is subjected to relatively large force, while the middle area is subjected to relatively small force. In some examples, the first partition 3 can be set on the edge area (i.e., the position with large deformation amplitude) on the side of the battery cell 2 where the force is large, and the first partition 3 is not set on the middle area (i.e., the position with small deformation amplitude) on the side of the battery cell 2 where the force is small.

[0091] In some examples, the first partition 3 can be provided on the flat area on the side of the battery cell 2, while the first partition 3 can be omitted on the uneven areas on the side of the battery cell 2. For example, if there is a coating at the bottom of the battery cell 2 and the coating position is raised relative to the battery cell 2, the first partition 3 can also avoid the coating position.

[0092] In this embodiment, the first partition 3 can be a solid plate (without any holes or grooves on the plate surface). The solid plate is suitable for increasing the coverage area of ​​the first partition 3 on the side of the battery cell 2. For example, Figures 11a1-a3 respectively illustrate that the first partition 3 is a solid plate. A1 illustrates the entire area where the first partition 3 is bonded to the side of the battery cell 2. A2 illustrates the flat area where the first partition 3 is bonded to the side of the battery cell 2. The bottom coating position of the battery cell 2 is not provided with the first partition 3. A3 illustrates that the first partition 3 is not only bonded to the flat area of ​​the side of the battery cell 2, but also extends further beyond the top of the battery cell 2. This is more beneficial for improving the insulation isolation performance between two adjacent battery cells 2.

[0093] In other examples, for the scheme where the first separator 3 covers part of the side of the cell 2, as shown in Figure 12, the first separator 3 can have openings 33, that is, the first separator 3 is a perforated plate. Alternatively, as shown in Figure 13, the first separator 3 can include a plurality of spaced sub-separators 30.

[0094] The gap between the opening 33 of the first partition 3 or the sub-partition 30 can correspond to the position on the side of the cell 2 where the first partition 3 does not need to be set, so that the bonding position of the first partition 3 on the cell 2 is targeted. For example, this allows the first partition 3 to be set at a position on the side of the cell 2 where the deformation range is large.

[0095] In some examples, the side of the battery cell 2 has a first region and a second region. When the battery cell 2 is subjected to impact loads or expansion deformation, the force in the first region is greater than that in the second region. In this case, the first partition 3 can be a perforated plate or include multiple spaced sub-partitions 30, and the first partition 3 is disposed in the first region. This not only makes the bonding position of the first partition 3 on the battery cell 2 more targeted, but also helps to reduce weight and cost while ensuring the structural rigidity of the battery cell assembly 20.

[0096] Figures 12, b1-b3 respectively illustrate that the first partition 3 has an opening 33. The first partition 3 is disposed on the side of the battery cell 2 in a first region (i.e., the edge region) where the force is greater, and its opening 33 faces the side of the battery cell 2 in a second region (i.e., the middle region) where the force is less.

[0097] Figure 13, d1-d4 respectively illustrate that the first partition 3 includes multiple spaced sub-partitions 30. d1-d3 illustrate that the multiple sub-partitions 30 can be evenly arranged on the side of the cell 2. d4 illustrates that the sub-partitions 30 are arranged in the first region (i.e., the edge region) on the side of the cell 2 where the force is greater, while the second region (i.e., the middle region) on the side of the cell 2 where the force is less is not provided with sub-partitions 30.

[0098] In some examples, for the first separator 3 in the form of double-sided adhesive, at least one of the top and bottom ends of the first separator 3 is projected onto the side of the cell 2 between the top and bottom ends of the cell 2. That is, the top end of the first separator 3 does not extend to be flush with or beyond the top end of the cell 2 (e.g., Figures 12 and 13), and / or the bottom end of the first separator 3 does not extend to be flush with or beyond the bottom end of the cell 2 (e.g., a2 and a3 in Figure 11, and Figures 12 and 13). Thus, a filling gap can be formed between the first separator 3 and the side of the cell 2, which can be filled with adhesive. This makes the first separator 3, the side of the cell 2, and the bottom wall of the housing 1 fixedly bonded together, improving the assembly stability and structural rigidity of the battery pack.

[0099] Furthermore, based on the above example, chamfered structures can be provided at the top and bottom of the side of the battery cell 2. These chamfered structures can serve as a transition between the end faces of the top and bottom of the battery cell 2 and the side of the battery cell 2. Compared to a right-angle connection forming a sharp corner structure, the battery cell 2 is less likely to scratch other components it contacts. Moreover, the aforementioned filling gap can be formed by the chamfered structures of two adjacent battery cells 2, the side of the battery cell 2, and the top and bottom of the first partition 3. This results in a larger filling gap space and a relatively larger adhesive layer, thus making the bonding structure more stable.

[0100] The above provides an exemplary description of the arrangement scheme between the multiple battery cells 2 and the first partition 3. The following provides an exemplary description of the assembly scheme between the multiple battery cells 2 and the housing 1.

[0101] As mentioned above, the surfaces of the multi-row cells 2 closest to the sidewalls and bottom walls of the housing 1 are fixedly bonded to the sidewalls and bottom walls of the housing 1, respectively. In other words, the outermost cells 2 in the multi-row cells 2 are fixedly bonded to the housing 1. This fixed bonding method ensures that the gap between the cell structure formed by the multi-row cells 2 and the housing 1 at the connection point is zero. This not only improves the space utilization of the battery pack but also facilitates the smooth transmission of force from the multi-row cells 2 to the sidewalls of the housing 1.

[0102] Battery packs provided by related technologies typically have gaps between cells, gaps between cell modules, and gaps between cell modules and the casing. The battery pack provided in this disclosure, compared with related technologies, no longer has the above-mentioned gaps, significantly improving space utilization.

[0103] The bonding between the battery cell 2 and the casing 1 can be achieved using structural adhesive, double-sided tape, or other types of high-viscosity adhesives, thereby forming a cured adhesive 5 at the gap between the battery cell 2 and the casing 1. For example, structural adhesive can be used for the above bonding. The adhesive 5 formed by the curing of structural adhesive not only provides strong bonding strength, but also makes it easier to fill the gap between the battery cell 2 and the casing 1 before the structural adhesive cures, ensuring a gapless connection between the battery cell 2 and the casing 1 as much as possible. This is more beneficial for improving the structural rigidity of the battery pack.

[0104] In some examples, the structural adhesive can be made into a thermally conductive structural adhesive to improve thermal conductivity.

[0105] For the adhesive bonding scheme between the outer wall of the multi-row battery cell 2 and the inner wall of the housing 1, and between the bottom wall of the multi-row battery cell 2 and the bottom wall of the housing 1, the adhesive 5 in the gap between the multi-row battery cell 2 and the housing 1 can be in a continuous structure or a dispersed structure. For the dispersed structure of the adhesive 5, the adhesive 5 can be located at the upper gap position and the lower gap position between the outer wall of the multi-row battery cell 2 and the inner wall of the housing 1.

[0106] In some examples, the filling volume of the colloid 5 can be greater than or equal to 30% of the volume of the gap between the multi-row cells 2 and the housing 1, further greater than or equal to 50%, and further up to 100%.

[0107] In some examples, for the thermally conductive structural adhesive filling scheme between the bottom wall of the multi-row cell 2 and the bottom wall of the housing 1, the filling volume of the thermally conductive structural adhesive can be greater than or equal to 70% of the gap volume between the bottom wall of the multi-row cell 2 and the bottom wall of the housing 1, and can be further 90%-100%.

[0108] When applying adhesive at the gap between the multi-row battery cells 2 and the housing 1, one or more adhesive strips can be set at specific positions on the inner sidewall and bottom wall of the housing 1. On the one hand, the adhesive strips make the gap size between the housing 1 and the multi-row battery cells 2 more controllable, which is more beneficial for preventing the housing 1 and the multi-row battery cells 2 from contacting each other. On the other hand, when applying adhesive, the amount of adhesive is usually large to ensure that the adhesive fully fills the gap, and the adhesive strips can prevent the adhesive from overflowing. Furthermore, the adhesive strips can effectively position the adhesive application.

[0109] In some examples, a liquid cooling structure is provided at the bottom of the housing 1, and the structural adhesive between the bottom wall of the multi-row cells 2 and the bottom wall of the housing 1 is a thermally conductive structural adhesive. The liquid cooling structure enables cooling of the battery pack, and by using a thermally conductive structural adhesive between the bottom wall of the multi-row cells 2 and the bottom wall of the housing 1, the heat transfer between the liquid cooling structure, the bottom wall of the housing 1, and the multi-row cells 2 is made more efficient, reducing heat loss.

[0110] In this embodiment, the liquid cooling structure can be a separate liquid cooling plate, which is stacked on the bottom of the bottom wall of the housing 1. Alternatively, the liquid cooling structure can be a liquid cooling channel integrated into the bottom wall of the housing 1. In particular, when a liquid cooling channel is provided on the bottom wall of the housing 1, it can also be called a liquid cooling plate or a water cooling plate, and it can directly cool the battery cell 2. The liquid cooling path does not need to pass through other components, which is more beneficial for improving cooling efficiency and reducing energy consumption.

[0111] Currently, the battery pack casing 1 is typically designed with a pre-assembled accommodating cavity, into which battery cell modules 2 or multiple battery cells 2 clamped by support beams are directly assembled. Unlike related technologies, this disclosure provides a split casing 1, making the battery pack assembly process more flexible. As shown in Figures 14-15, the casing 1 includes a top cover 11, a bottom plate 12, two side plates 13, and two end plates 14. The two side plates 13 are opposite each other along the width direction of the battery pack, and the two end plates 14 are opposite each other along the length direction of the battery pack. The two side plates 13 and the two end plates 14 cooperate to form a frame. The top cover 11 is fixedly connected to the top of the frame to close the top opening of the frame, and the bottom plate 12 is fixedly connected to the bottom of the frame to close the bottom opening of the frame. The depth of the top cover 11 in the height direction of the battery pack is less than the depth of the frame. The bottom plate 12 is the bottom wall of the casing 1 mentioned above, and the top cover 11 is the top wall of the casing 1 mentioned above.

[0112] As can be seen, the shell 1 used in this embodiment is a high box structure, wherein the upper cover 11 can be a cover as shown in Figure 14 or a plate as shown in Figure 17.

[0113] Referring to the assembly structure of each cell 2 in the battery pack shown in Figure 9, the assembly process of the battery pack is illustrated as follows: One row of cells 2 arranged along the width direction of the battery pack is fixedly bonded to the first partition 3 to form a cell group 20. The cell group 20 is then fixedly bonded to the corresponding position on the base plate 12. Subsequently, a second partition 4 is optionally fixedly bonded to the large surface of multiple cells 2 in the cell group 20. Then, the other multiple cell groups 20 are assembled on the base plate 12. After all cells 2 are assembled, the side plate 13 and end plate 14 are fixedly bonded to the side walls of the multiple rows of cells 2. Then, the side plate 13 and end plate 14 are fixedly connected to the base plate 12. Finally, the top cover 11 is fixedly connected to the top opening of the frame, thus completing the assembly of the battery pack.

[0114] It is evident that, considering the structure of the battery pack, the housing 1 arranged in the above-mentioned structure is more advantageous in terms of assembly process feasibility and assembly cost, which helps to reduce the assembly difficulty of the battery pack and makes the assembly process more flexible.

[0115] Of course, it is not excluded that the battery pack housing 1 can also be designed with a pre-assembled accommodating cavity. For example, the frame formed by the side plate 13 and the end plate 14 can be an integral frame. After the multi-row cells 2 are placed in the frame, they can be glued at the gaps by potting. This is more beneficial to improving the sealing of the housing 1, but it will lead to a more complicated assembly process and increased cost. It can be selected according to actual needs. For example, this assembly method can be selected for cases where the weight of the multi-row cells 2 is low.

[0116] To further simplify the battery pack structure, liquid cooling pipes can be installed inside the base plate 12. The surfaces of the multi-row cells 2 closest to the base plate 12 are bonded to the base plate 12 with thermally conductive structural adhesive. The thermally conductive structural adhesive has both excellent structural strength and thermal conductivity, which helps to make the transfer of cold energy between the liquid cooling pipes, the base plate 12 of the housing 1, and the multi-row cells 2 more efficient and reduce cold energy loss.

[0117] In this embodiment of the disclosure, the connection method between any two of the top cover 11, bottom plate 12, side plate 13, and end plate 14 that are connected includes at least one of welding, screw connection, riveting, and bonding, as long as the connection strength is large enough so that the shell 1 can directly support the battery cell 2 and fully control the expansion and deformation of the battery cell 2.

[0118] Furthermore, the connection points of any two of the side plates 13, end plates 14, top cover 11, and bottom plate 12 that are connected can be sealed with sealant. The sealant is used to seal the connection gap, thereby ensuring the airtightness of the inner cavity of the housing 1. Good sealing helps to reduce condensation, reduce fire, and reduce heat diffusion, etc.

[0119] To further improve the sealing performance of the inner cavity of the housing 1, as shown in Figures 16 and 17, for each of the two side plates 132, the side plate 13 further includes: a first bending portion 1302 located at the bottom end of the side plate in the height direction of the battery pack and a second bending portion 1303 located at the top end of the side plate. The first bending portion 1302 extends toward the inner cavity of the housing 1 and is fixedly connected to the bottom surface of the bottom plate 12; the second bending portion 1303 extends toward the direction away from the inner cavity of the housing 1 and is fixedly connected to the top cover 11.

[0120] Figures 16 and 17 both illustrate that the side plate 13 includes a side plate portion 1301, a first bent portion 1302 and a second bent portion 1303, the first bent portion 1302 is connected to the bottom end of the side plate portion 1301 and the second bent portion 1303 is connected to the top end of the side plate portion 1301.

[0121] The first bend 1302 connects to the bottom surface of the base plate 12, increasing the contact area between the side plate 13 and the base plate 12, which improves the sealing between them (e.g., by applying sealant between the first bend 1302 and the base plate 12). Furthermore, the first bend 1302 supports the base plate 12, acting as a support beam. The load from the multiple rows of cells 2 is transferred to the side plate 13 and then to the first bend 1302, reducing the rigidity requirement of the base plate 12. This eliminates the need for an additional support frame compared to related technologies, improving the structural rigidity of the battery pack while reducing the number and weight of components. Moreover, when the battery pack moves on the slide, the first bend 1302 can bear the load instead of the base plate 12, further reducing the rigidity requirement of the base plate 12.

[0122] The second bend 1303 is connected to the bottom surface of the top cover 11 to increase the contact area between the side plate 13 and the top cover 11. This is more beneficial for improving the sealing between the top cover 11 and the side plate 13. For example, a sealant can be provided between the second bend 1303 and the top cover 11.

[0123] Along the width direction of the battery pack, the first separator 3 is arranged in multiple rows. In some examples, two end plates 14 are fixedly connected to the ends of at least some of the first separators 3 in the multiple rows (see Figure 8). That is, at least some of the first separators 3 can extend outwards from the outside of the multiple rows of cells 2 along the length direction of the battery pack, and the ends of the first separators 3 located outside the multiple rows of cells 2 are fixedly connected to the corresponding positions of the end plates 14. As a further example, a metal connector can be provided at the ends of the first separators 3 located outside the multiple rows of cells 2, and the metal connector is welded to the end plates 14 to achieve a fixed connection, which helps to further improve the structural rigidity of the battery pack.

[0124] For multiple rows of first separators 3 distributed along the width direction of the battery pack, each row of first separators 3 can be a single separator or can include multiple separators distributed along the length direction of the battery pack. When a row of first separators 3 includes multiple separators, the two separators closest to the end plate 14 are fixedly connected to the end plate 14. Alternatively, for multiple rows of first separators 3 distributed along the width direction of the battery pack, some rows of first separators 3 can be fixedly connected to the end plate 14, or all rows of first separators 3 can be fixedly connected to the end plate 14. For example, Figure 8 only illustrates the first separator 3 located in the middle region being fixedly connected to the end plate 14.

[0125] The battery pack includes not only the battery component but also the electrical component. For example, some electrical components include battery management system-related devices, sampling devices, relays, fuses, active balancing devices, etc., to monitor and manage the battery cell 2.

[0126] This disclosure provides an exemplary description of the arrangement of the battery portion in the housing 1. As for the electrical portion, it can be arranged separately from the battery portion in different cavities. That is, the housing 1 can be provided with independent battery compartments and electrical compartments. The battery compartment is used to accommodate the battery portion, and the electrical compartment is used to accommodate the electrical portion. There is a partition between the battery compartment and the electrical compartment. The partition is provided with through holes to allow cables and the like to pass through in a sealed manner, thereby realizing the electrical connection between the battery portion and the electrical portion.

[0127] Furthermore, regarding the top cover 11, bottom plate 12, side plate 13, end plate 14, and surrounding plate 15 involved in the embodiments of this disclosure, they can be made of various types of materials, such as aluminum plates, aluminum profiles, steel plates, steel profiles, and polymer resin-based composite materials, provided that their strength meets the requirements. For example, the top cover 11, bottom plate 12, and side plate 13 can all be made of aluminum plates or steel plates, and the end plate 14 can be made of aluminum profiles or steel profiles with higher rigidity.

[0128] On the other hand, embodiments of this disclosure provide an energy storage cabinet that includes a plurality of battery packs as described above, the plurality of battery packs being stacked in the height direction of the energy storage cabinet.

[0129] The energy storage cabinet provided in this embodiment has all the advantages of the battery pack described in this embodiment, and will not be repeated here.

[0130] Since the battery pack provided in this embodiment has high structural rigidity and low strength requirements for the base plate of the battery pack housing, while the static energy storage cabinet has low strength requirements for the base plate of the battery pack housing, in some examples, the energy storage cabinet involved in this embodiment can be a static energy storage cabinet.

[0131] Of course, it is not excluded that the energy storage cabinet is a mobile energy storage cabinet. For other mobile scenarios without special collision and compression requirements, the energy storage cabinet involved in the embodiments of this disclosure can also be set as a mobile form.

[0132] The above description is only for the purpose of enabling those skilled in the art to understand the technical solutions disclosed herein, and is not intended to limit the scope of this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A battery pack, wherein, The battery pack includes: a housing (1) and multiple rows of cells (2) housed inside the housing (1), the multiple rows of cells (2) being arranged side by side along the width direction of the battery pack, and the multiple cells (2) included in each row of cells (2) being arranged along the length direction of the battery pack; A first partition (3) is provided between two adjacent cells (2) arranged side by side along the width direction of the battery pack. The two opposite surfaces of the first partition (3) are fixedly bonded to the sides of the two cells (2). The surfaces of the multiple rows of cells (2) that are close to the side wall and bottom wall of the housing (1) are fixedly bonded to the side wall and bottom wall of the housing (1) respectively.

2. The battery pack according to claim 1, wherein, In the multi-row cell (2), a plurality of first partitions (3) are provided between two adjacent rows of cells (2), and a first partition (3) is provided between each pair of cells (2) arranged side by side in the width direction of the battery pack.

3. The battery pack according to claim 1, wherein, One or more first separators (3) are provided between two adjacent rows of cells (2) in the multi-row cells (2), and at least some of the adjacent cells (2) of the multiple cells (2) arranged in the length direction of the battery pack are fixedly bonded to one of the first separators (3).

4. The battery pack according to claim 3, wherein, Along the length of the battery pack, the length of the first separator (3) is greater than the length of a single cell (2), and less than or equal to the sum of the lengths of a plurality of adjacent cells (2) along the length of the battery pack.

5. The battery pack according to claim 1, wherein, A second partition (4) is provided between two adjacent cells (2) in the length direction of the battery pack, and multiple adjacent cells (2) arranged side by side along the width direction of the battery pack are fixedly bonded to the same second partition (4).

6. The battery pack according to claim 5, wherein, In the width direction of the battery pack, the length of the second separator (4) is greater than the length of a single cell (2) and less than or equal to the length of a plurality of adjacent cells (2) in the width direction.

7. The battery pack according to claim 5, wherein, Both the first partition (3) and the second partition (4) are insulating boards.

8. The battery pack according to claim 1, wherein, The first partition (3) covers part of the side of the battery cell (2).

9. The battery pack according to claim 8, wherein, The first partition (3) has an opening (33), or the first partition (3) includes a plurality of spaced sub-partitions (30).

10. The battery pack according to any one of claims 1-9, wherein, The housing (1) includes: a top cover (11), a bottom plate (12), two side plates (13), and two end plates (14); The two side plates (13) are opposite each other along the width direction of the battery pack, and the two end plates (14) are opposite each other along the length direction of the battery pack. The two side plates (13) and the two end plates (14) cooperate to form a frame. The top cover (11) is fixedly connected to the top of the frame to close the top opening of the frame, and the bottom plate (12) is fixedly connected to the bottom of the frame to close the bottom opening of the frame. The depth of the top cover (11) in the height direction of the battery pack is less than the depth of the frame.

11. The battery pack according to claim 10, wherein, The connection points of any two of the top cover (11), the bottom plate (12), the two side plates (13), and the two end plates (14) that are connected are covered with sealant, which is used to seal the connection gap.

12. The battery pack according to claim 10, wherein, The base plate (12) is provided with liquid cooling pipes, and the surfaces of the multi-row cells (2) closest to the base plate (12) are bonded to the base plate (12) by thermally conductive structural adhesive.

13. The battery pack according to claim 10, wherein, For each of the two side plates (132), the side plate (13) further includes: a first bend (1302) located at the bottom end of the side plate in the height direction and a second bend (1303) located at the top end of the side plate; The first bend (1302) extends toward the inner cavity of the housing (1), and the first bend (1302) is fixedly connected to the bottom surface of the base plate (12); The second bend (1303) extends away from the inner cavity of the housing (1) and is fixedly connected to the upper cover (11).

14. The battery pack according to claim 10, wherein, Along the width direction of the battery pack, the first separator (3) is arranged in multiple columns, and the two end plates (14) are fixedly connected to the ends of at least some of the columns of the first separator (3).

15. An energy storage cabinet, wherein, The energy storage cabinet includes: a plurality of battery packs as described in any one of claims 1-14, wherein the plurality of battery packs are stacked in the height direction of the energy storage cabinet.

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