Battery pack and energy storage cabinet

Abstract

The utility model provides a battery pack and an energy storage cabinet, and belongs to the technical field of batteries. The battery pack comprises a shell and a plurality of columns of battery cells accommodated in the shell, the plurality of columns of battery cells are arranged side by side along the width direction of the battery pack, and a plurality of battery cells included in each column of battery cells are arranged along the length direction of the battery pack; a first partition plate is arranged between every two adjacent battery cells arranged side by side in the width direction of the battery pack, the two opposite surfaces of each first partition plate are fixedly bonded with the side faces of the two battery cells respectively, and the faces, close to the side wall and the bottom wall of the shell, of the multiple columns of battery cells are fixedly bonded with the side wall and the bottom wall of the shell respectively. According to the battery pack, the internal space of the battery is fully utilized while the structural rigidity is improved, the number of parts of the battery pack is reduced, the structure is simplified, the integration level of the battery pack is higher, and the space utilization rate and the energy density of the battery pack can be improved.

Description

TECHNICAL FIELD

[0001] The embodiment of the utility model relates to battery technology field, especially battery pack and energy storage cabinet. BACKGROUND

[0002] At present, in order to improve the space utilization and energy density of battery, the battery pack gradually develops from CTM (Cell to Module) structure to CTP (Cell to Pack) structure, and the CTP structure reduces or omits the battery module, and the battery cell is directly loaded into the shell of the battery pack, so that the battery pack realizes higher integration and higher space utilization.

[0003] The battery pack with CTP structure provided by the related technology is stacked in the shell according to the set direction to form the battery cell stack, and the support beam is arranged at the bottom of the shell to improve the structural rigidity. However, the use of the support beam still occupies a large space and reduces the space utilization, so the space utilization of the battery pack still needs to be improved. UTILITY MODEL CONTENT

[0004] The embodiment of the utility model provides battery pack and energy storage cabinet, can solve the technical problem existing in related art. Specifically, the technical scheme is as follows.

[0005] On the one hand, the utility model embodiment provides a kind of battery pack, the battery pack includes: shell and the multiple columns of battery cells contained in the shell interior, the multiple columns of battery cells are arranged side by side along the width direction of battery pack, and multiple battery cells included in each column of battery cells are arranged along the length direction of battery pack;First partition is arranged between the two battery cells arranged side by side along the width direction of battery pack, and the opposite two surfaces of the first partition are respectively fixedly bonded with the side surface of the two battery cells, and the surface of the multiple columns of battery cells close to the side wall and bottom wall of the shell is respectively fixedly bonded with the side wall and bottom wall of the shell.

[0006] The battery pack provided by the embodiment of the utility model, by making the multiple battery cells arranged side by side along the width direction of the battery pack fixedly bonded with the first partition plate, the multiple battery cells are mutually constrained along the width direction of the battery pack based on the first partition plate and form a battery pack, and the structural form of the battery pack gives the battery pack higher structural rigidity, and the battery pack can be used as a structural reinforcing beam to improve the structural rigidity of the battery pack, on this basis, the surface of the side wall and the bottom wall of the multiple rows of battery cells close to the shell is fixedly bonded with the side wall and the bottom wall of the shell respectively, so that the multiple rows of battery cells can transmit the load to the side wall of the shell more than to the bottom wall of the shell, the strength requirement of the bottom wall of the shell is significantly reduced, the additional support beam structure is avoided to be separately arranged at the bottom of the battery pack, the internal space of the battery is fully utilized on the basis of meeting the structural rigidity requirement of the battery pack, and the space utilization of the battery pack is significantly improved, and moreover, the number of parts of the battery pack is reduced, the structure is simplified, and the integration of the battery pack is higher, which is also beneficial to improving the energy density of the battery pack.

[0007] In some possible implementation manners, a plurality of first partition plates are arranged between any two adjacent rows of battery cells in the multiple rows of battery cells, and one first partition plate is arranged between each pair of battery cells arranged side by side in the width direction of the battery pack. The multiple battery cells arranged side by side along the width direction of the battery pack can form a row of battery cell groups, and any two adjacent battery cell groups in the length direction of the battery pack are independent and do not share a first partition plate, so that when the battery pack is assembled, the single battery cell group with light weight can be easily inverted, and then the multiple battery cell groups are sequentially stacked and inverted, so as to realize the assembly of all battery cells in the battery pack and significantly reduce the assembly difficulty, thereby facilitating the simplification of the preparation process of the battery pack.

[0008] In some possible implementation manners, one or more first partition plates are arranged between any two adjacent rows of battery cells in the multiple rows of battery cells, and at least some adjacent battery cells in the multiple battery cells arranged in the length direction of the battery pack are fixedly bonded with the first partition plate. It can be seen that the first partition plate in the battery pack is shared by the multiple battery cells arranged in the length direction of the battery pack, and this scheme is more beneficial to enhancing the structural rigidity of the battery pack.

[0009] For the above implementation manner, exemplarily, along the length direction of the battery pack, the length of the first partition plate is greater than the length of a single battery cell and less than or equal to the sum of the lengths of the multiple adjacent battery cells in the length direction of the battery pack.

[0010] In some possible implementations, a second separator plate is arranged between two adjacent battery cells in the length direction of the battery pack, and a plurality of battery cells adjacent to each other in the width direction of the battery pack are fixedly bonded to the same second separator plate. By fixing a plurality of battery cells adjacent to each other in the width direction of the battery pack to the same second separator plate, bonding failure between the battery cells and the first separator plate can be avoided, and the structural rigidity of the battery pack can be ensured to be stably maintained.

[0011] For the above implementations, for example, in the width direction of the battery pack, the length of the second separator plate is greater than the length of a single battery cell and less than or equal to the length of a plurality of battery cells adjacent to each other in the width direction.

[0012] In some possible implementations, the first separator plate and the second separator plate are both insulating plates, to ensure insulation between any two adjacent battery cells and improve the safety of the battery pack. For example, the first separator plate is a hard insulating separator plate to better transmit force, and the second separator plate is a flexible insulating separator plate to absorb swelling and deformation of the battery cells and assembly tolerances.

[0013] In some possible implementations, the first separator plate covers part of the side surface of the battery cell. When the first separator plate covers part of the side surface of the battery cell, the amount of the first separator plate can be reduced to make the battery pack lightweight and reduce costs, and the first separator plate can be flexibly arranged on the side surface of the battery cell, while ensuring the structural rigidity of the battery pack.

[0014] For the above implementations, for example, the first separator plate has an opening, or the first separator plate includes a plurality of sub-separator plates arranged at intervals.

[0015] In some possible implementations, the shell includes an upper cover, a bottom plate, two side plates, and two end plates. The two side plates are opposite to each other in the width direction of the battery pack, and the two end plates are opposite to each other in the length direction of the battery pack. The two side plates and the two end plates cooperate to form a frame. The upper cover is fixedly connected to the top end of the frame to close the top opening of the frame, and the bottom plate is fixedly connected to the bottom end of the frame to close the bottom opening of the frame. The depth of the upper cover in the height direction of the battery pack is less than the depth of the frame.

[0016] It can be seen that the shell is a high-box structure, and the upper cover can be in the form of a cover body or a plate body. By fixedly connecting the components of the shell, the assembly process is more feasible and the assembly cost is lower, the assembly difficulty of the battery pack is reduced, and the assembly process is more flexible.

[0017] For the above implementation manner, exemplarily, the connection position of any two of the upper cover, the bottom plate, the two side plates and the two end plates has sealing glue, the sealing glue is used for sealing the connection gap, so as to ensure the sealing of the inner cavity of the shell, and good sealing is beneficial to reducing condensation, reducing fire, reducing heat diffusion and the like.

[0018] For the above implementation manner, exemplarily, the bottom plate is provided with a liquid cooling pipe, and the surface of the plurality of columns of battery cells close to the bottom plate is adhered to the bottom plate through the heat-conducting structural adhesive. The heat-conducting structural adhesive has excellent structural strength and heat conduction performance, which is beneficial to making the cold energy transmission among the liquid cooling pipe, the bottom plate of the shell and the plurality of columns of battery cells more efficient and reducing cold energy loss.

[0019] For the above implementation manner, exemplarily, for each of the two side plates, the side plate further includes: a first bending part at the bottom end of the side plate in the height direction and a second bending part at the top end of the side plate, the first bending part extends towards the direction close to the inner cavity of the shell, and the first bending part is fixedly connected with the bottom surface of the bottom plate; the second bending part extends away from the inner cavity of the shell, and the second bending part is fixedly connected with the upper cover.

[0020] By connecting the first bending part with the bottom surface of the bottom plate, on the one hand, the contact area of the side plate and the bottom plate is increased, which is beneficial to improving the sealing between the bottom plate and the side plate (for example, sealing glue is arranged between the first bending part and the bottom plate). On the other hand, the first bending part supports the bottom plate, the first bending part acts as a support beam, and the load of the plurality of columns of battery cells is transmitted to the side plate and then to the first bending part, thereby reducing the requirement for the rigidity of the bottom plate. This cancels the additional support frame in the related art, improves the structural rigidity of the battery pack, and is beneficial to reducing the number and weight of parts. On the other hand, when the battery pack moves on the slide, the first bending part can replace the bottom plate to bear the force, thereby further reducing the requirement for the rigidity of the bottom plate.

[0021] By connecting the second bending part with the bottom surface of the upper cover, the contact area of the side plate and the upper cover is increased, which is more beneficial to improving the sealing between the upper cover and the side plate and the side plate, for example, sealing glue is arranged between the second bending part and the upper cover.

[0022] In some possible implementation manners, along the width direction of the battery pack, the first partition plates are arranged in multiple columns, and the two end plates are fixedly connected with the end portions of the first partition plates in at least part of the columns, which is beneficial to further improving the structural rigidity of the battery pack.

[0023] In another aspect, there is provided an energy storage cabinet, comprising: a plurality of battery packs as described above, stacked in a height direction of the energy storage cabinet.

[0024] The energy storage cabinet provided by the embodiments of the present application has all the advantages of the battery pack described in the embodiments of the present application, which will not be repeated here.

[0025] Since the battery pack provided by the embodiments of the present application has a large structural rigidity, and the strength requirement of the bottom plate of the battery pack shell is low, and the static energy storage cabinet has a low strength requirement for the bottom plate of the shell of the battery pack, in some examples, the energy storage cabinet related to the embodiments of the present application can be a static energy storage cabinet. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A top view cross-sectional view of a first exemplary battery pack provided by the embodiments of the present application is shown in the figure;

[0027] Figure 2 A front view of the battery pack shown in the figure is shown in the figure; Figure 1

[0028] Figure 3 A combination view between a plurality of battery cells arranged side by side in the width direction of the battery pack provided by the embodiments of the present application is shown in the figure;

[0029] Figure 4 A structural schematic view of an exemplary battery cell provided by the embodiments of the present application is shown in the figure;

[0030] Figure 5 An exploded view between two battery cells arranged side by side in the width direction of the battery pack provided by the embodiments of the present application is shown in the figure;

[0031] Figure 6 A combination and exploded view of part of the battery cells in the battery pack provided by the embodiments of the present application is shown in the figure;

[0032] Figure 7 A top view cross-sectional view of a second exemplary battery pack provided by the embodiments of the present application is shown in the figure;

[0033] Figure 8 A top view cross-sectional view of a third exemplary battery pack provided by the embodiments of the present application is shown in the figure;

[0034] Figure 9 A top view cross-sectional view of a fourth exemplary battery pack provided by the embodiments of the present application is shown in the figure;

[0035] Figure 10 A structural schematic view of an exemplary split-type partition provided by the embodiments of the present application is shown in the figure;

[0036] Figure 11 ​A series of solid partition plates provided by the embodiment of the utility model are arranged on the side of the battery cell;

[0037] Figure 12 A series of hollow partition plates provided by the embodiment of the utility model are arranged on the side of the battery cell;

[0038] Figure 13 A series of sub-partition plate combined form partition plates provided by the embodiment of the utility model are arranged on the side of the battery cell;

[0039] Figure 14 A isometric view of an exemplary battery pack provided by the embodiment of the utility model;

[0040] Figure 15 A Figure 14 Partial structure schematic view of the battery pack shown in the figure after removing the upper cover;

[0041] Figure 16 A Figure 14 Partial enlarged view of the battery pack shown in the figure;

[0042] Figure 17 A front view of an exemplary battery pack provided by the embodiment of the utility model.

[0043] The reference signs respectively represent:

[0044] 1, shell;

[0045] 11, upper cover; 12, bottom plate; 13, side plate; 1301, side plate part; 1302, first bending part; 1303, second bending part; 14, end plate;

[0046] 2, battery cell; 201, positive pole; 202, negative pole; 20, battery cell group;

[0047] 3, first partition plate; 30, sub-partition plate; 31, core plate; 32, adhesive layer; 33, opening;

[0048] 4, second partition plate;

[0049] 5, glue body. DETAILED DESCRIPTION

[0050] In the description of the embodiment of the utility model, it is understood that the terms "top", "bottom", "upper", "lower", "inner", "outer", "length", "thickness", "width" and the like indicate the orientation or positional relationship, which is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiment of the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and the orientation may change when the product is placed in different postures, therefore it cannot be understood as a limitation on the embodiment of the utility model.

[0051] At present, the space utilization of the battery pack of the CTP structure is improved compared with the battery pack of the CTM structure, but there is still room for improvement. It can be seen that both the battery pack of the CTM structure and the battery pack of the CTP structure have the problem of low space utilization, which leads to low energy density.

[0052] To solve the above technical problems, the utility model embodiment provides a battery pack, which has higher space utilization while ensuring excellent structural rigidity. Figure 1 An overhead sectional view of a battery pack is shown, Figure 2 A front view of the battery pack is shown, Figure 3 A combined view of a plurality of battery cells arranged side by side in the width direction of the battery pack is shown. As shown in Figure 1 -Appendix Figure 3 The battery pack includes a shell 1 and a plurality of battery cells 2 contained in the shell 1, the plurality of battery cells 2 are arranged side by side in the width direction of the battery pack, and the plurality of battery cells 2 included in each column of battery cells 2 are arranged in the length direction of the battery pack.

[0053] For the arrangement of the plurality of battery cells 2 in the shell 1, further reference can be made to Figure 4 , Figure 4 The structure of the battery cell 2 involved in the utility model embodiment is shown, as shown in Figure 4 The length direction of the battery cell 2 is along the X-axis direction, the width direction is along the Y-axis direction, and the height is along the Z-axis direction. The battery cell 2 has two opposite sides and two opposite large faces, and the side of the battery cell 2 is arranged adjacent to the large face, wherein the "side of the battery cell 2" referred to here refers to the surface defined by the width side of the battery cell 2 and the height side of the battery cell 2. The "large face of the battery cell 2" referred to here refers to the surface defined by the length side of the battery cell 2 and the height side of the battery cell 2.

[0054] For the plurality of battery cells 2 arranged side by side in the width direction of the battery pack involved in the utility model embodiment, the sides of any two adjacent battery cells 2 are opposite. For each column of battery cells 2 arranged in the length direction of the battery pack involved in the utility model embodiment, the large faces of any two adjacent battery cells 2 are opposite.

[0055] Further combined Figure 4The positive pole 201 and the negative pole 202 are arranged on the surface of the battery cell 2, which is defined by the length direction and the width direction, and the surface on which the positive pole 201 and the negative pole 202 are arranged is defined as the top surface (i.e., the top wall) of the battery cell 2 in the embodiment of the utility model, and correspondingly, the top wall of the battery cell 2 faces the top wall of the shell 1, the bottom wall of the battery cell 2 faces the bottom wall of the shell 1, and the side and the large surface of the battery cell 2 respectively face the side wall and the bottom wall of the shell 1.

[0056] Particularly, as shown in the accompanying drawings Figure 1 and the accompanying drawings Figure 5 , the first partition plate 3 is arranged between the two adjacent battery cells 2 arranged side by side along the width direction of the battery pack, the opposite two surfaces of the first partition plate 3 are respectively fixedly bonded with the side surfaces of the two adjacent battery cells 2, and the surfaces of the battery cells 2 close to the side wall and the bottom wall of the shell 1 are respectively fixedly bonded with the side wall and the bottom wall of the shell 1, which not only helps to improve the structural rigidity of the battery pack, but also helps to significantly reduce the space utilization of the battery pack, and the reasons are as follows:

[0057] For the plurality of battery cells 2 arranged side by side along the width direction of the battery pack, the first partition plate 3 is fixedly bonded between any two adjacent battery cells 2, so that the plurality of battery cells 2 arranged side by side along the width direction of the battery pack form an integrated battery cell group 20 (wherein, Figure 3 one of the plurality of battery cells 2 arranged side by side along the width direction of the battery pack is exemplified, and the four battery cells 2 of the row form the battery cell group 20 based on the first partition plate 3).

[0058] For the battery cell group 20, the lengths of the plurality of battery cells 2 are stacked, so that the length of the battery cell group 20 is relatively long, and the plurality of battery cells 2 are constrained to each other, and the force between the plurality of battery cells 2 is transmitted through the first separator 3, so that the battery cell group 20 is loaded and stressed based on the shell structure with the relatively long length, and the structural rigidity of the battery cell group 20 is improved compared with the single battery cell 2. On this basis, when the battery cell group 20 is assembled inside the shell 1 of the battery pack and the surfaces of those battery cells 2 close to the shell 1 are fixedly bonded with the side wall and the bottom wall of the shell 1 respectively, on the one hand, the length of the battery cell group 20 is relatively long and the structural rigidity is relatively large, so that the battery cell group 20 itself can serve as a structural reinforcement beam of the battery pack, thereby improving the structural rigidity of the battery pack. On the other hand, the force applied by the battery cell group 20 to the shell 1 can be sequentially transmitted to the two side walls distributed in the width direction of the shell 1 through the plurality of battery cells 2 constrained to each other, so that the force applied by the battery cell group 20 to the shell 1 is no longer concentrated on the bottom wall of the shell 1, but is partially dispersed to the side walls of the shell 1, so that the battery cell group 20 simultaneously applies force to the side walls and the bottom wall of the shell 1, so that the force applied to the shell 1 is more dispersed, thereby reducing the strength requirement of the shell 1, in particular, the strength requirement of the bottom wall of the shell 1, so that it is not necessary to additionally provide a support beam structure at the bottom of the battery pack, which is particularly advantageous for improving the space utilization of the battery pack.

[0059] And in the related art, along the width direction of the battery pack, the plurality of battery cells are arranged independently of each other, so that the force cannot be transmitted between the plurality of battery cells, not to mention further transmitted to the side walls of the shell, and for each battery cell, the battery cell applies force to the bottom wall of the shell based on its own gravity, that is, each battery cell transmits load to the bottom wall of the shell, which requires the strength of the bottom wall of the shell to be large enough, so that a support beam for reinforcement is usually provided at the bottom of the plurality of battery cells, and the use of the support beam reduces the space utilization of the battery pack.

[0060] And the battery pack related to the embodiments of the present application can transmit the load to the side walls of the shell 1 rather than the bottom wall of the shell 1 through the plurality of battery cells 2 constrained to each other, so that the strength requirement of the bottom wall of the shell 1 is significantly reduced, and it is not necessary to separately provide an additional support beam structure at the bottom of the battery pack, thereby facilitating the improvement of the space utilization of the battery pack. Moreover, since the battery cell group 20 itself has high structural rigidity and can serve as a structural reinforcement beam of the battery pack, the structural rigidity requirement of the battery pack can be met, and the structural strength of the battery pack is large enough while improving the space utilization of the battery pack.

[0061] In conclusion, the battery pack provided by the utility model embodiment has the following advantages: the plurality of battery cells 2 arranged side by side along the width direction of the battery pack are fixedly bonded with the first partition plate 3, the plurality of battery cells 2 are constrained along the width direction of the battery pack based on the first partition plate 3 and form the battery pack 20, the structural form of the battery pack 20 gives the battery pack 20 high structural rigidity, and the battery pack 20 can be used as a structural reinforcing beam of the battery pack to improve the structural rigidity of the battery pack. On this basis, the side wall and the bottom wall of the shell 1 are fixedly bonded with the side wall and the bottom wall of the shell 1 respectively, so that the plurality of battery cells 2 can transmit the load to the side wall of the shell 1 more than to the bottom wall of the shell 1, the strength requirement of the bottom wall of the shell 1 is significantly reduced, the additional support beam structure is avoided to be arranged at the bottom of the battery pack, the internal space of the battery is fully utilized on the basis of meeting the structural rigidity requirement of the battery pack, and the space utilization of the battery pack is significantly improved. In addition, the number of parts of the battery pack is reduced, the structure is simplified, and the integration of the battery pack is higher, which is also beneficial to improving the energy density of the battery pack.

[0062] Compared with the scheme that the plurality of battery cells 2 directly form the CTP structure of the battery pack in the related art, the battery pack provided by the utility model embodiment avoids arranging the support beam for reinforcement at the bottom of the plurality of battery cells 2, reduces the number of parts, simplifies the structure, improves the space utilization, and reduces the weight and cost. According to calculation, compared with the battery pack with the traditional CTP structure, the weight of the non-battery cell part of the battery pack provided by the utility model embodiment is reduced by about 50%.

[0063] Compared with the scheme that the plurality of battery cells 2 form the battery module and then form the CTM structure of the battery pack in the related art, the battery pack provided by the utility model embodiment avoids arranging the end plate on the large face of the two battery cells 2 located at the outermost side, also reduces the number of parts, simplifies the structure, improves the space utilization, and reduces the weight and cost.

[0064] It is mentioned above that the first partition plate 3 is fixedly bonded between the side surfaces of any two adjacent battery cells 2 along the width direction of the battery pack, the first partition plate 3 is fixedly bonded with the side surfaces of the battery cells 2 and keeps face-to-face contact, so that the two adjacent battery cells 2 transmit force to each other through the first partition plate 3.

[0065] In some examples, the first partition plate 3 has the characteristics of bearing pressure and transmitting the pressure to the battery cell 2 bonded therewith. For example, the compressive strength of the first partition plate 3 is greater than or equal to 1 Mpa, so that the deformation amount of the first partition plate 3 when bearing pressure meets the use conditions and design requirements. Further, the compressive strength of the first partition plate 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.

[0066] In some examples, the first partition plate 3 is a rigid material, so that the first partition plate 3 does not have the deformation ability. In other examples, the first partition plate 3 can be appropriately deformed (the deformation amount is controlled within a set range) to release part of the stress. For example, the deformation rate of the first partition plate 3 is less than 10%, and further, the deformation rate is less than 5%, for example, can be 3%. In this way, during the thermal runaway process of the battery cell 2, the first partition plate 3 is not easy to break due to the load or expansion of the battery cell 2, which ensures stable force transmission and effectively avoids the direct contact of the side surfaces of the two adjacent battery cells 2.

[0067] In order to enhance the safety of the battery pack, at least the surface of the first partition plate 3 in contact with the battery cell 2 is insulated, and further, the entire first partition plate 3 can also be insulated. In some examples, the insulation resistance of the two side surfaces of the first partition plate 3 is greater than or equal to 10,000 Ω / mm, and for the entire first partition plate 3, the insulation resistance of the first partition plate 3 itself can be greater than or equal to 10,000 Ω / mm.

[0068] In order to suppress the heat transfer between the two adjacent battery cells 2 through the first partition plate 3, the first partition plate 3 can also have the heat insulation characteristics to avoid rapid heat transfer. In this way, when one of the battery cells 2 is in thermal runaway, the high temperature generated can be heat insulated by the first partition plate 3, and will not be rapidly transmitted to the battery cell 2 adjacent to the battery cell 2 in thermal runaway, thereby causing heat diffusion.

[0069] In order to meet the heat insulation requirement of the first partition plate 3, in some examples, the thermal conductivity of the first partition plate 3 in the normal direction along the side surface of the battery cell 2 can be less than or equal to 1 W / K·m, and further, the thermal conductivity can be less than or equal to 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.

[0070] Further, when the battery cell 2 is in thermal runaway, it is expected that the first partition plate 3 can withstand high temperature under the thermal runaway condition to avoid melting or even breaking of the first partition plate 3 under high temperature, thereby causing failure of the isolation structure. The utility model embodiment also expects that the first partition plate 3 has temperature resistance, and in some examples, the temperature resistance of the first partition plate 3 can be greater than or equal to 120℃, and further, the temperature resistance of the first partition plate 3 can be greater than or equal to 125℃, 130℃, 135℃, 140℃, 145℃, 150℃, 155℃, 160℃, 165℃, 170℃, 175℃, 180℃, 185℃, 190℃, 200℃, 300℃, 400℃, 500℃, 600℃, 700℃, 800℃, 900℃, 1000℃, etc.

[0071] According to the strength requirement, temperature resistance requirement, etc. of the battery pack, the type of the first partition plate 3 is selected, and then the shape, size, material, etc. of the first partition plate 3 are determined. For example, for the thickness of the first partition plate 3 (the size in the width direction of the battery pack), in order to meet the compression strength and insulation and heat insulation requirements of the first partition plate 3, the thickness of the first partition plate 3 can be greater than or equal to 0.5 mm, for example, the thickness of the first partition plate 3 can be 0.5 mm-5 mm, so that not only the compression strength and insulation and heat insulation requirements are met, but also the length size of the battery cell group 20 can be avoided to be additionally increased.

[0072] In the utility model embodiment, the material of some applicable first partition plates 3 includes structural glue, hard silica gel foam, and high polymer material plate (for example, epoxy plate, etc.). For the high polymer material plate, reinforcing fibers can be further added to improve the strength, temperature resistance, etc. of the plate.

[0073] As mentioned above, the first partition plate 3 is fixedly connected to the side surface of the battery cell 2 by bonding, for example, bonding can be implemented by structural glue, double-sided adhesive tape or other glue with insulation properties. When the structural glue is used to implement the bonding operation, the solidified structural glue can be used as the first partition plate 3.

[0074] In order to obtain the desired bonding force and prevent bonding failure due to expansion of the battery cell 2 or excessive load, in some examples, the tangential bonding strength between the first separator 3 and the side of the battery cell 2 is greater than or equal to 0.3 MPa, and 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.

[0075] In the battery pack involved in the embodiment of the present invention, the multiple battery cells 2 arranged along the length direction of the battery pack can each be bonded with a corresponding first partition 3, or some of the multiple battery cells 2 arranged along the length direction of the battery pack can also share a first partition 3. The above schemes are respectively explained as examples below.

[0076] Attachment Figure 1 The example of setting a plurality of first separators 3 independent of each other in the battery pack is shown. Figure 1 In some examples (1), a plurality of first partitions 3 are provided between two adjacent columns of battery cells 2 in a plurality of columns of battery cells 2, a first partition 3 is provided between each pair of battery cells 2 arranged side by side in the width direction of the battery pack, and at the same time, a first partition 3 is provided corresponding to each of the plurality of battery cells 2 arranged in the length direction of the battery pack.

[0077] As mentioned above, multiple battery cells 2 arranged side by side along the width direction of the battery pack can form a row of battery cell groups 20, and multiple rows of battery cell groups 20 are arranged in sequence along the length direction of the battery pack. Example (1) shows that any two adjacent battery cell groups 20 in the length direction of the battery pack are independent of each other and do not share the first partition 3. The advantage of such an arrangement is that compared with the total mass of all battery cells 2 in the battery pack, the weight of a single battery cell group 20 is lighter. In this way, when assembling the battery pack, the lighter single battery cell group 20 can be easily inverted, and then multiple battery cell groups 20 can be stacked and inverted in sequence, thereby realizing the assembly of all battery cells 2 in the battery pack, and significantly reducing the difficulty of assembly, which is conducive to simplifying the preparation process of the battery pack.

[0078] Attachment Figure 7 The example shows that for each column of battery cells 2, a plurality of first separators 3 are provided along the length direction of the battery pack, and the plurality of first separators 3 are shared by adjacent portions of the battery cells 2 in the column. Figure 8 The example shows that for each column of battery cells 2 , a first separator 3 is provided along the length direction of the battery pack, and the first separator 3 is shared by all battery cells 2 in the column of battery cells 2 .

[0079] Combine Figure 7 and Figure 8In some examples (2), one or more first separators (3) are arranged between two adjacent columns of the plurality of columns of battery cells 2, and at least some of the adjacent battery cells 2 in the plurality of battery cells 2 arranged in the length direction of the battery pack are fixedly bonded with the first separator 3. As can be seen, example 2 illustrates a scheme in which the first separator 3 is shared by the plurality of battery cells 2 arranged in the length direction of the battery pack, which is more advantageous for enhancing the structural rigidity of the battery pack.

[0080] Further, 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 the adjacent plurality of battery cells 2 in the length direction of the battery pack. It should be noted that the length of the first separator 3 referred to here refers to the dimension of the first separator 3 in the length direction of the battery pack, and the length of the battery cell 2 also refers to the dimension of the battery cell 2 in the length direction of the battery pack.

[0081] Figure 7 As illustrated, some of the adjacent battery cells 2 in the plurality of battery cells 2 arranged in the length direction of the battery pack are fixedly bonded with the first separator 3, and the length of the first separator 3 is greater than the length of a single battery cell 2 and less than the sum of the lengths of all the adjacent battery cells 2 in the length direction of the battery pack. According to the Figure 7 As illustrated in the scheme, the three rows of battery cells 2 on the left share one first separator 3, the three rows of battery cells 2 in the middle share another first separator 3, and the four rows of battery cells on the right share another first separator 3. Of course, based on this layout idea, other implementations are not excluded, for example, for each column of battery cells 2, four, five or other number of first separators 3 can also be arranged in the length direction of the battery pack. For such a scheme, while improving the structural rigidity of the battery pack, it also ensures that the weight of the battery cell combination structure composed of those battery cells 2 sharing the first separator 3 is not too large, so as to facilitate assembly.

[0082] Figure 8 As illustrated, all the battery cells 2 in the plurality of battery cells 2 arranged in the length direction of the battery pack are fixedly bonded with the first separator 3, so that all the battery cells 2 in the battery pack form a monolithic structure, which is more advantageous for enhancing the structural rigidity of the battery pack. In addition, Figure 8 In the scheme, 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 the adjacent battery cells 2 in the length direction of the battery pack.

[0083] The battery pack involved in the embodiments of the utility model, such as the Figure 6As shown, a second partition plate 4 is arranged between two adjacent battery cells 2 in the length direction of the battery pack, and the second partition plate 4 is fixedly bonded to the large faces of the two adjacent battery cells 2. For example, the second partition plate 4 is a flexible insulating partition, such as flexible foam, aerogel, etc., which is conducive to absorbing the swelling deformation of the battery cell 2 and assembly tolerance.

[0084] In some examples, as shown in FIG. 1, the battery pack 1 includes a plurality of battery cells 2 arranged in a plurality of rows along the length direction of the battery pack 1, and the battery cells 2 in at least some of the rows are fixedly bonded to the same second partition plate 4. Figure 7 and FIG. 2, the battery pack 1 includes a plurality of battery cells 2 arranged in a plurality of rows along the length direction of the battery pack 1, and the battery cells 2 in each of the rows are fixedly bonded to the same second partition plate 4. Figure 9 As shown, a plurality of battery cells 2 adjacent side by side in the width direction of the battery pack are fixedly bonded to the same second partition plate 4.

[0085] For the battery pack, a plurality of rows of battery cells 2 are distributed along the length direction of the battery pack, and the battery cells 2 in at least some of the rows are fixedly bonded to the same second partition plate 4. For example, as shown in FIG. 1, the battery cells 2 in the third row from the left are fixedly bonded to the same second partition plate 4, and the battery cells 2 in the sixth row are fixedly bonded to the same second partition plate 4. Of course, based on this idea, other arrangements are not excluded. As shown in FIG. 2, the battery cells 2 in each of the rows are fixedly bonded to the same second partition plate 4. Figure 7 As shown, a plurality of battery cells 2 adjacent side by side in the width direction of the battery pack are fixedly bonded to the same second partition plate 4. Figure 9 As shown, a plurality of battery cells 2 adjacent side by side in the width direction of the battery pack are fixedly bonded to the same second partition plate 4.

[0086] By fixing the plurality of battery cells 2 adjacent side by side in the width direction of the battery pack to the same second partition plate 4, it is conducive to avoiding bonding failure between the battery cells 2 and the first partition plate 3, achieving the effect of ensuring that the structural rigidity of the battery pack can be stably maintained.

[0087] Further, in the width direction of the battery pack, the length of the second partition plate 4 is greater than the length of a single battery cell 2 and less than or equal to the length of a plurality of battery cells 2 adjacent in the width direction. It should be noted that, here, the length of the second partition plate 4 refers to the dimension of the second partition plate 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.

[0088] For example, as shown in FIG. 1, the length of the second partition plate 4 is less than the length of a plurality of battery cells 2 adjacent in the width direction of the battery pack, and the second partition plate 4 has a gap between the end and the side wall of the shell 1, and the gap can be filled with structural glue or the like to achieve fixed connection between the second partition plate 4 and the side wall of the shell 1. Figure 9 As shown, a plurality of battery cells 2 adjacent side by side in the width direction of the battery pack are fixedly bonded to the same second partition plate 4.

[0089] As described above, the first partition plate 3 and the second partition plate 4 can both be insulating plates to ensure insulating isolation between any two adjacent battery cells 2, improving the safety of the battery pack. For example, the first partition plate 3 is a hard insulating partition plate to better transmit force, and the second partition plate 4 is a flexible insulating partition plate to absorb the swelling deformation of the battery cell 2 and assembly tolerance.

[0090] The first partition plate 3 can be a multi-layer structure or a single-layer structure. An example of the first partition plate 3 in a multi-layer structure can be a double-sided adhesive partition plate. Referring to Figure 10 The double-sided adhesive first partition plate 3 includes a core plate 31 and an adhesive layer 32 arranged on opposite side surfaces of the core plate 31. The first partition plate 3 is bonded to the side surface of the battery cell 2 through the adhesive layer 32. For the first partition plate 3 in a multi-layer structure, the core plate 31 has higher flexibility in selection. The core plate 31 with a suitable material, size, and structural form can be selected according to actual needs to be suitable for different types of battery packs. For example, the core plate 31 can be a high polymer plate.

[0091] The first partition plate 3 in an integrated structure can be a structural adhesive. The structural adhesive can withstand strong pressure and transmit force on the basis of achieving the bonding function. The first partition plate 3 in the form of a structural adhesive is also beneficial to simplify the assembly difficulty of the battery cell 2.

[0092] For the bonding scheme of the first partition plate 3 on the side surface of the battery cell 2, the first partition plate 3 can cover all the side surfaces of the battery cell 2, or the first partition plate 3 can cover part of the side surfaces of the battery cell 2. When the first partition plate 3 covers part of the side surfaces of the battery cell 2, the use amount of the first partition plate 3 can be reduced on the basis of ensuring the improvement of the structural rigidity of the battery pack, the first partition plate 3 is lightweight and the cost is reduced, and the first partition plate 3 is flexibly arranged on the side surface of the battery cell 2 (for example, the first partition plate 3 can not be arranged on the uneven positions on the side surface of the battery cell 2).

[0093] For example, the bonding area between the first partition plate 3 and the side surface of the battery cell 2 is greater than or equal to 20% of the area of the side surface of the battery cell 2 and less than or equal to 95% of the area of the side surface of the battery 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%, or the like of the area of the side surface of the battery cell 2. The required bonding strength and the stress area of the first partition plate 3 are determined according to the specifications and strength requirements of the battery pack.

[0094] In the embodiment of the utility model, the orthographic projection of the first partition plate 3 on the side surface of the battery cell 2 can exactly cover the side surface of the battery cell 2, or can be within the range defined by the side surface of the battery cell 2 without extending beyond the large surface and the bottom surface of the battery cell 2. On the basis of meeting the requirement, the first partition plate 3 can be connected (for example, bonded) to any position on the side surface of the battery cell 2.

[0095] When the battery cell 2 is subjected to an impact load or swelling, the battery cell 2 will be stressed accordingly, and in general, different regions of the battery cell 2 can be stressed differently, for example, the edge regions of the battery cell 2 can be relatively large in stress, and the middle region of the battery cell 2 can be relatively small in stress, and in some examples, the first partition plate 3 can be arranged at the edge regions of the battery cell 2 on the side of the battery cell 2 that are relatively large in deformation amplitude (i.e., the positions of relatively large deformation amplitude), and the middle region of the battery cell 2 on the side of the battery cell 2 that is relatively small in deformation amplitude (i.e., the positions of relatively small deformation amplitude) is not provided with the first partition plate 3.

[0096] In some examples, the first partition plate 3 can be arranged at the flat regions on the side of the battery cell 2, and the first partition plate 3 can not be arranged at the uneven positions on the side of the battery cell 2, for example, if the bottom of the battery cell 2 is provided with a film, and the film position is convex relative to the battery cell 2, then the first partition plate 3 can also avoid the film position.

[0097] In the embodiments of the utility model, the first partition plate 3 can be a solid plate (there is no hole or slot on the plate surface), and the solid plate is suitable for increasing the coverage area of the first partition plate 3 on the side of the battery cell 2, for example, Figure 11 a1-a3 of the utility model respectively illustrate that the first partition plate 3 is a solid plate, a1 illustrates that the first partition plate 3 is bonded to all regions on the side of the battery cell 2, a2 illustrates that the first partition plate 3 is bonded to the flat regions on the side of the battery cell 2, and the bottom film position of the battery cell 2 is not provided with the first partition plate 3, and a3 illustrates that the first partition plate 3 is not only bonded to the flat regions on the side of the battery cell 2, but also further extends out of the top of the battery cell 2, which is more conducive to improving the insulation isolation performance between the adjacent two battery cells 2.

[0098] In other examples, for the scheme that the first partition plate 3 covers part of the side of the battery cell 2, as shown in the accompanying Figure 12 , the first partition plate 3 can be provided with an opening 33, that is, the first partition plate 3 is a hollow plate. Figure 13 , the first partition plate 3 can include a plurality of sub-partition plates 30 arranged at intervals.

[0099] The gap between the openings 33 or the sub-partition plates 30 of the first partition plate 3 can correspond to the position on the side of the battery cell 2 that does not need to be provided with the first partition plate 3, so that the bonding position of the first partition plate 3 on the battery cell 2 is targeted, for example, which allows the first partition plate 3 to be arranged at the position of the side of the battery cell 2 that is relatively large in deformation amplitude.

[0100] In some examples, the side surface of the battery cell 2 has a first region and a second region, and the force borne by the first region is greater than that borne by the second region when the battery cell 2 is subjected to an impact load or swelling deformation. In this case, the first partition plate 3 can be a hollow plate or include a plurality of sub-partition plates 30 arranged at intervals, and the first partition plate 3 is arranged at the first region, so that the bonding position of the first partition plate 3 on the battery cell 2 is more targeted, and the battery cell group 20 is not only ensured in structural rigidity, but also lightened and reduced in cost.

[0101] Figure 12 b1-b3 of FIG. 1 respectively illustrate that the first partition plate 3 has an opening 33, and the first partition plate 3 is arranged at the first region (i.e., the edge region) of the side surface of the battery cell 2 that bears a greater force, and the opening 33 of the first partition plate 3 faces the second region (i.e., the middle region) of the side surface of the battery cell 2 that bears a smaller force.

[0102] Figure 13 d1-d4 of FIG. 1 respectively illustrate that the first partition plate 3 includes a plurality of sub-partition plates 30 arranged at intervals, and d1-d3 illustrate that the plurality of sub-partition plates 30 can be uniformly arranged at the side surface of the battery cell 2. d4 illustrates that the sub-partition plates 30 are arranged at the first region (i.e., the edge region) of the side surface of the battery cell 2 that bears a greater force, and the second region (i.e., the middle region) of the side surface of the battery cell 2 that bears a smaller force is not provided with the sub-partition plates 30.

[0103] In some examples, for the first partition plate 3 in the form of double-sided adhesive, at least one of the top end and the bottom end of the first partition plate 3 projects onto the side surface of the battery cell 2 between the top end and the bottom end of the battery cell 2, that is, the top end of the first partition plate 3 does not extend to the top end of the battery cell 2 (for example, Figure 12 and Figure 13 ), and / or the bottom end of the first partition plate 3 does not extend to the bottom end of the battery cell 2 (for example, Figure 11 a2 and a3 of FIG. 1, and Figure 12 and Figure 13 ), so that a filling gap can be formed between the first partition plate 3 and the side surface of the battery cell 2, and the filling gap can be filled with glue, so that the first partition plate 3, the side surface of the battery cell 2 and the bottom wall of the shell 1 are fixedly bonded as a whole, and the assembly stability and structural rigidity of the battery pack are improved.

[0104] Further, on the basis of the above examples, chamfer structures can also be arranged at the top end and the bottom end of the side surface of the battery cell 2. The chamfer structure can be a transition between the end surface of the top end and the bottom end of the battery cell 2 and the side surface of the battery cell 2. Compared with a straight angle transition, the chamfer structure forms a sharp corner structure, and the battery cell 2 is less likely to scratch other components in contact with the battery cell 2. In addition, the above-mentioned gap can be a larger gap space formed by the chamfer structures of the adjacent two battery cells 2, the side surface of the battery cell 2, and the top end and the bottom end of the first partition plate 3. The filled glue layer is relatively larger, and thus the bonding structure is more stable.

[0105] The above describes the arrangement scheme between the plurality of battery cells 2 and the first partition plate 3. The following describes the assembly scheme between the plurality of battery cells 2 and the shell 1.

[0106] As mentioned above, the surface of the plurality of battery cells 2 close to the side wall and the bottom wall of the shell 1 is fixedly bonded to the side wall and the bottom wall of the shell 1. That is, the outermost battery cells 2 of the plurality of battery cells 2 are fixedly bonded to the shell 1. Through the fixed bonding mode, the gap between the battery cell structure formed by the plurality of battery cells 2 and the shell 1 at the connection position is 0. This not only helps to improve the space utilization of the battery pack, but also helps the plurality of battery cells 2 to smoothly transmit force to the side wall of the shell 1.

[0107] The battery pack provided by the related art has gaps between the battery cells, gaps between the battery cell modules, and gaps between the battery cell modules and the shell. Compared with the related art, the battery pack provided by the embodiments of the present application no longer has the above-mentioned gaps, and the space utilization is significantly improved.

[0108] The bonding between the battery cell 2 and the shell 1 can be implemented by structural glue, double-sided adhesive tape, or other types of high-adhesion glue, so as to form a cured glue body 5 at the gap between the battery cell 2 and the shell 1. For example, the above-mentioned bonding can be implemented by using structural glue. The glue body 5 formed based on the structural glue not only can provide strong bonding strength, but also can be conveniently filled into the gap between the battery cell 2 and the shell 1 before curing, so as to ensure that the battery cell 2 and the shell 1 are connected without gaps as much as possible. This is more conducive to improving the structural rigidity of the battery pack.

[0109] In some examples, in order to improve the heat conduction effect, the structural glue can be a heat-conducting structural glue.

[0110] For the gluing scheme between the outer side wall of the plurality of columns of battery cells 2 and the inner side wall of the shell 1 and between the bottom wall of the plurality of columns of battery cells 2 and the bottom wall of the shell 1, the glue 5 in the gap between the plurality of columns of battery cells 2 and the shell 1 can be in a continuous structure or in a dispersed structure. For the dispersed structure of the glue 5, the glue 5 can be located at the upper gap position and the lower gap position between the outer side wall of the plurality of columns of battery cells 2 and the inner side wall of the shell 1.

[0111] In some examples, the filling volume of the glue 5 can be greater than or equal to 30% of the volume of the gap between the plurality of columns of battery cells 2 and the shell 1, further can be greater than or equal to 50%, and further can be 100%.

[0112] In some examples, for the heat-conducting structural glue filling scheme between the bottom wall of the plurality of columns of battery cells 2 and the bottom wall of the shell 1, the filling volume of the heat-conducting structural glue can be greater than or equal to 70% of the gap volume between the bottom wall of the plurality of columns of battery cells 2 and the bottom wall of the shell 1, and further can be 90%-100%.

[0113] When gluing is implemented at the gap between the plurality of columns of battery cells 2 and the shell 1, one or more glue blocking strips can be arranged at specific positions of the inner side wall and the bottom wall of the shell 1. On the one hand, the glue blocking strips make the gap size between the shell 1 and the plurality of columns of battery cells 2 more controllable, which is more advantageous for preventing the contact between the shell 1 and the plurality of columns of battery cells 2. On the other hand, when gluing is implemented, the amount of glue is usually large to ensure that the glue liquid fully fills the gap, and the glue blocking strips can prevent the glue liquid from overflowing. On the other hand, the glue blocking strips can effectively position the gluing position.

[0114] In some examples, the bottom of the shell 1 is provided with a liquid cooling structure, and the structural glue located between the bottom wall of the plurality of columns of battery cells 2 and the bottom wall of the shell 1 is a heat-conducting structural glue. Through the liquid cooling structure, the cooling of the battery pack can be realized. By making the structural glue located between the bottom wall of the plurality of columns of battery cells 2 and the bottom wall of the shell 1 a heat-conducting structural glue, it is beneficial to make the cold quantity transmission between the liquid cooling structure-the bottom wall of the shell 1-the plurality of columns of battery cells 2 more efficient and reduce the cold quantity loss.

[0115] In the embodiments of the utility model, the liquid cooling structure can be a separate liquid cooling plate, which is arranged in layers at the bottom of the bottom wall of the shell 1, or the liquid cooling structure can also be a liquid cooling channel integrated on the bottom wall of the shell 1. In particular, when the liquid cooling channel is arranged on the bottom wall of the shell 1, it can also be called a liquid cooling plate or a water cooling plate, and it can directly cool the battery cells 2. The liquid cooling path does not need to pass through other components, which is more advantageous for improving the cooling efficiency and reducing energy consumption.

[0116] At present, the shell 1 of the battery pack is usually designed to have a pre-assembled accommodating cavity, and the battery cell 2 module or the plurality of battery cells 2 clamped by the support beam is directly assembled into the accommodating cavity, unlike the related art, the utility model embodiment provides a split type shell 1, so that the assembly process of the battery pack is more flexible, such as the accompanying Figure 14 - the accompanying Figure 15 As shown, the shell 1 includes an upper cover 11, a bottom plate 12, two side plates 13 and two end plates 14, wherein the two side plates 13 are opposite along the width direction of the battery pack, the two end plates 14 are opposite along the length direction of the battery pack, and the two side plates 13 and the two end plates 14 cooperate to form a surrounding frame; the upper cover 11 is fixedly connected to the top end of the surrounding frame to close the top opening of the surrounding frame, and the bottom plate 12 is fixedly connected to the bottom end of the surrounding frame to close the bottom opening of the surrounding frame; the depth of the upper cover 11 in the height direction of the battery pack is less than the depth of the surrounding frame. Wherein, the bottom plate 12 is the bottom wall of the shell 1 mentioned above, and the upper cover 11 is the top wall of the shell 1 mentioned above.

[0117] It can be seen that the shell 1 adopted in the utility model embodiment is a high box structure, wherein the upper cover 11 can be in the form of a cover body as shown in Figure 14 , or in the form of a plate body as shown in Figure 17 .

[0118] In combination with the assembly structure of each battery cell 2 in the battery pack as shown in Figure 9 , the following exemplary description is made on the assembly process of the battery pack: one row of battery cells 2 arranged along the width direction of the battery pack is fixedly bonded with the first partition plate 3 and forms a battery cell group 20, the battery cell group 20 is fixedly bonded to the corresponding position on the bottom plate 12, then the second partition plate 4 is optionally fixedly bonded on the large surface of the plurality of battery cells 2 in the battery cell group 20, and then the assembly of other plurality of battery cell groups 20 on the bottom plate 12 is performed. After all the battery cells 2 are assembled, the side plates 13 and the end plates 14 are fixedly bonded with the side walls of the plurality of rows of battery cells 2, then the fixed connection of the side plates 13 and the end plates 14 with the bottom plate 12 is implemented, and finally the upper cover 11 is fixedly connected to the top opening of the surrounding frame, so that the assembly of the battery pack is realized.

[0119] It can be seen that in combination with the structure of the battery pack, the shell 1 arranged in the above structure is more advantageous in terms of assembly process feasibility and assembly cost, which is beneficial to reduce the assembly difficulty of the battery pack and makes the assembly process more flexible.

[0120] Of course, it is not excluded that the shell 1 of the battery pack can also be designed to have a pre-assembled accommodating cavity, for example, the surrounding frame composed of the side plate 13 and the end plate 14 can adopt an integrated surrounding frame, after the plurality of battery cells 2 are placed in the surrounding frame, the gap is glued by the glue pouring mode, which is more favorable for improving the sealing performance of the shell 1, but will lead to a more complex assembly process and cost increase, and the selection can be made according to the actual demand, for example, for the case that the weight of the plurality of battery cells 2 is low, the assembly mode can be selected.

[0121] For the bottom plate 12, in order to further simplify the structure of the battery pack, a liquid cooling pipe can be arranged in the bottom plate 12, and the surface of the plurality of battery cells 2 close to the bottom plate 12 is adhered to the bottom plate 12 by a heat-conducting structural adhesive, and the heat-conducting structural adhesive has excellent structural strength and heat-conducting performance, which is beneficial to make the cold energy transmission among the liquid cooling pipe, the bottom plate 12 of the shell 1 and the plurality of battery cells 2 more efficient and reduce the cold energy loss.

[0122] In the embodiment of the utility model, the connection mode between any two of the upper cover 11, the bottom plate 12, the side plate 13 and the end plate 14 includes at least one of welding, screw connection, riveting and bonding, as long as the connection strength is large enough to make the shell 1 can directly support the battery cell 2, and the expansion deformation of the battery cell 2 is controlled sufficiently.

[0123] Further, the connection position of any two of the side plate 13, the end plate 14, the upper cover 11 and the bottom plate 12 can have sealing glue, and the sealing glue is used to seal the connection gap, so as to ensure the sealing performance of the inner cavity of the shell 1, and good sealing is beneficial to reduce condensation, reduce fire and reduce heat diffusion.

[0124] In order to further improve the sealing performance of the inner cavity of the shell 1, as shown in the accompanying drawings Figure 16 and the accompanying drawings Figure 17 As shown in the accompanying drawings, for each of the two side plates 13, the side plate 13 further comprises: a first bending part 1302 located at the bottom end of the side plate in the height direction of the battery pack and a second bending part 1303 located at the top end of the side plate, the first bending part 1302 extends towards the direction close to the inner cavity of the shell 1, and the first bending part 1302 is fixedly connected with the bottom surface of the bottom plate 12; the second bending part 1303 extends away from the direction of the inner cavity of the shell 1, and the second bending part 1303 is fixedly connected with the upper cover 11.

[0125] Figure 16 and Figure 17 all show that the side plate 13 comprises a side plate part 1301, a first bending part 1302 and a second bending part 1303, the first bending part 1302 is connected to the bottom end of the side plate part 1301, and the second bending part 1303 is connected to the top end of the side plate part 1301.

[0126] By connecting the first bending part 1302 with the bottom surface of the bottom plate 12, on the one hand, the contact area between the side plate 13 and the bottom plate 12 is increased, which is beneficial to improve the sealing between the bottom plate 12 and the side plate 13 (for example, sealing glue is arranged between the first bending part 1302 and the bottom plate 12). On the other hand, the first bending part 1302 supports the bottom plate 12, and the first bending part 1302 acts as a support beam. After the load is transmitted to the side plate 13 by the plurality of battery cells 2, the load is transmitted to the first bending part 1302, which reduces the requirement for the rigidity of the bottom plate 12, cancels the additional support frame in the related art, improves the structural rigidity of the battery pack, and reduces the number and weight of parts.

[0127] By connecting the second bending part 1303 with the bottom surface of the upper cover 11, the contact area between the side plate 13 and the upper cover 11 is increased, which is more beneficial to improve the sealing between the upper cover 11 and the side plate 13 and the side plate 13. For example, sealing glue is arranged between the second bending part 1303 and the upper cover 11.

[0128] Along the width direction of the battery pack, the first partition plate 3 is arranged in multiple columns. In some examples, the two end plates 14 are fixedly connected with the end portions of at least part of the first partition plates 3 in the multiple columns of the first partition plates 3 (see Figure 8 ). That is, at least part of the first partition plates 3 can extend to the outside of the plurality of battery cells 2 along the length direction of the battery pack, and the end portions of the first partition plates 3 located outside the plurality of battery cells 2 are fixedly connected with the corresponding positions of the end plates 14. For further example, a metal connecting piece can be arranged at the end portion of the first partition plate 3 located outside the plurality of battery cells 2, and the metal connecting piece is welded to the end plate 14 to realize the fixed connection, which is beneficial to further improve the structural rigidity of the battery pack.

[0129] For the multiple columns of the first partition plates 3 distributed along the width direction of the battery pack, each column of the first partition plates 3 can be one partition plate, or can include multiple partition plates distributed along the length direction of the battery pack. When the column of the first partition plates 3 includes multiple partition plates, the two partition plates close to the end plate 14 in the multiple partition plates are fixedly connected with the end plate 14. In addition, for the multiple columns of the first partition plates 3 distributed along the width direction of the battery pack, part of the first partition plates 3 in the multiple columns of the first partition plates 3 can be fixedly connected with the end plate 14, or all the first partition plates 3 in the multiple columns of the first partition plates 3 can be fixedly connected with the end plate 14. For example, Figure 8 Only the first partition plate 3 located in the middle region is fixedly connected with the end plate 14.

[0130] For the battery pack, it not only includes the battery part, but also includes the electrical part, for example, some electrical devices in the electrical part include battery management system related devices, sampling devices, relays, fuses, active balancing devices, etc., to realize the monitoring and management of the battery cell 2.

[0131] The utility model embodiment just makes exemplary elaboration to the arrangement of the battery part in the shell 1, for the electrical part, it can be arranged in different cavities respectively with the battery part, namely the shell 1 can set up independent battery compartment and electrical compartment, the battery compartment is used to accommodate the battery part, the electrical compartment is used to accommodate the electrical part, the battery compartment and the electrical compartment have the baffle between them, the through hole is set up on the baffle to allow the cable to be sealed and to penetrate, to realize the electrical connection between the battery part and the electrical part.

[0132] In addition, for the upper cover 11, the bottom plate 12, the side plate 13, the end plate 14 and the baffle 15 involved in the utility model embodiment, on the premise that their strength meets the demand, they can adopt various types of materials, for example, aluminum plate, aluminum profile, steel plate, steel profile, polymer resin-based composite material, etc. For example, the upper cover 11, the bottom plate 12 and the side plate 13 can all be aluminum plates or steel plates, and the end plate 14 can adopt aluminum profiles or steel profiles with higher rigidity.

[0133] On the other hand, the utility model embodiment provides a kind of energy storage cabinet, and the energy storage cabinet includes multiple battery packs described above, and multiple battery packs are stacked in the height direction of the energy storage cabinet.

[0134] The energy storage cabinet provided by the utility model embodiment has all the advantages of the battery pack described in the utility model embodiment, which will not be repeated here.

[0135] Since the battery pack provided by the utility model embodiment itself has a large structural rigidity, and the strength requirement of the bottom plate of the battery pack shell is low, and the static energy storage cabinet has a low strength requirement for the bottom plate of the battery pack shell, in some examples, the energy storage cabinet involved in the utility model embodiment can be a static energy storage cabinet.

[0136] Of course, it is not excluded that the energy storage cabinet is a movable energy storage cabinet, and for some other mobile scenarios without special collision and extrusion requirements, the energy storage cabinet involved in the utility model embodiment can also be set as a movable form.

[0137] The above is only to facilitate those skilled in the art to understand the technical solutions of the present disclosure, and is not intended to limit the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A battery pack, characterized by, The battery pack comprises a shell (1) and a plurality of battery cells (2) accommodated in the shell (1), the plurality of battery cells (2) are arranged side by side along the width direction of the battery pack, and the plurality of battery cells (2) in each column are arranged along the length direction of the battery pack; A first partition plate (3) is arranged between two adjacent battery cells (2) arranged side by side along the width direction of the battery pack, and the opposite surfaces of the first partition plate (3) are fixedly bonded with the side surfaces of the two battery cells (2) respectively, and the surfaces of the plurality of battery cells (2) close to the side wall and the bottom wall of the shell (1) are fixedly bonded with the side wall and the bottom wall of the shell (1) respectively.

2. The battery pack of claim 1, wherein, A plurality of first partition plates (3) are arranged between two adjacent columns of battery cells (2) in the plurality of battery cells (2), and one first partition plate (3) is arranged between each pair of battery cells (2) arranged side by side along the width direction of the battery pack.

3. The battery pack of claim 1, wherein, One or more first partition plates (3) are arranged between two adjacent columns of battery cells (2) in the plurality of battery cells (2), and at least part of the adjacent battery cells (2) in the plurality of battery cells (2) arranged along the length direction of the battery pack are fixedly bonded with the first partition plate (3).

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

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

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

7. The battery pack of claim 5, wherein, The first partition plate (3) and the second partition plate (4) are both insulating plates.

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

9. The battery pack of claim 8, wherein, The first partition plate (3) has an opening (33) or comprises a plurality of sub-partition plates (30) arranged at intervals.

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

11. The battery pack of claim 10, wherein, The connection position of any two connected parts of the upper cover (11), the bottom plate (12), the two side plates (13), and the two end plates (14) is provided with sealing glue for sealing the connection gap.

12. The battery pack of claim 10, wherein, A liquid cooling pipe is arranged in the bottom plate (12), and the surface of the plurality of columns of battery cells (2) close to the bottom plate (12) is adhered to the bottom plate (12) by a heat-conducting structural adhesive.

13. The battery pack of claim 10, wherein, For each of the two side plates (13), the side plate (13) further comprises: a first bending portion (1302) at the bottom end of the side plate in the height direction and a second bending portion (1303) at the top end of the side plate; The first bending portion (1302) extends towards the direction close to the inner cavity of the shell (1), and the first bending portion (1302) is fixedly connected with the bottom surface of the bottom plate (12); The second bending portion (1303) extends away from the inner cavity of the shell (1), and the second bending portion (1303) is fixedly connected with the upper cover (11).

14. The battery pack of claim 10, wherein, Along the width direction of the battery pack, the first partition plates (3) are arranged in multiple columns, and the two end plates (14) are fixedly connected with the end portions of at least part of the columns of the first partition plates (3).

15. An energy storage cabinet characterized by, The energy storage cabinet comprises a plurality of battery packs according to any one of claims 1-14, and the plurality of battery packs are stacked in the height direction of the energy storage cabinet.

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