Battery pack and powered device

Abstract

The application provides a battery pack and an electric device, the battery pack comprising at least a box body, a partition beam, at least two battery groups and at least two partition plates, the box body is provided with a containing cavity, the partition beam is arranged along a first direction to divide at least two battery compartments distributed along the first direction in the containing cavity; each battery group is arranged in each battery compartment, and the battery group comprises at least a plurality of battery monomers arranged in an array along the first direction and along a second direction; at least one partition plate is arranged between two columns of battery monomers arranged along the first direction and is fixedly connected with the first side face, the total width A of all partition beams in the second direction and the total width B of all partition plates in the first direction in a single battery compartment satisfy 0.05 <= A / B <= 1.5, the structural strength of the battery pack in the first direction and the second direction can be effectively ensured, the battery pack can work normally under long-time vibration working conditions, and the energy density of the battery pack can be effectively improved.

Description

Technical Field

[0001] This application relates to the field of batteries, specifically to a battery pack and an electrical device. Background Technology

[0002] Existing battery packs typically include partition beams and crossbeams to provide structural strength in two directions; however, to save space, battery packs with only partition beams have emerged. Because these packs only have partition beams, their internal structural strength is weakened.

[0003] Therefore, this type of battery pack needs to be improved to enhance the strength of its internal structure. Utility Model Content

[0004] In view of this, the embodiments of this application aim to provide a battery pack and electrical equipment to solve the technical problem that the existing battery packs only have partition beams, which weakens the internal structural strength of the battery pack.

[0005] The first aspect of this application provides a battery pack, comprising:

[0006] The box includes a base plate and a frame fixed to the outer periphery of the base plate, the base plate and the frame forming a receiving cavity;

[0007] A partition beam is configured to extend along a first direction of the battery pack and be fixedly connected to the frame and / or base plate to divide the receiving cavity into at least two battery compartments distributed along the first direction.

[0008] At least two battery packs are provided, each battery pack being disposed in a corresponding battery compartment. Each battery pack includes at least a plurality of battery cells arranged in an array along a first direction and a second direction. The first direction and the second direction are parallel to the large surface of the base plate. Each battery cell has a first side perpendicular to the first direction and a second side perpendicular to the second direction, and the width of the first side is greater than the width of the second side.

[0009] At least two partition plates, at least one of the partition plates is located between two rows of battery cells arranged along a first direction, and both sides of the partition plate are fixedly connected to the first side of at least two battery cells arranged along a second direction;

[0010] Wherein, the total width of all the partition beams in the second direction is A, in mm, and the total width of all the partition plates in a single battery compartment in the first direction is B, in mm, and A / B satisfies 0.05≤A / B≤1.5.

[0011] Another aspect of this application provides an electrical device including at least one battery pack.

[0012] In the battery pack of this application embodiment, the total width of all the partition beams in the second direction is A, and the total width of all the partition plates in a single battery compartment in the first direction is B. When A / B satisfies 0.05≤A / B≤1.5, the structural strength of the battery pack of this application embodiment in the first and second directions can be effectively guaranteed, thereby ensuring that the battery pack of this application embodiment can work normally under long-term vibration conditions, and the energy density of the battery pack of this application embodiment can also be effectively improved. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the battery pack structure according to an embodiment of this application;

[0014] Figure 2 This is another structural schematic diagram of the battery pack according to an embodiment of this application;

[0015] Figure 3 This is a schematic diagram of the battery pack structure according to an embodiment of this application;

[0016] Figure 4 This is a schematic diagram of the structure of a single battery cell according to an embodiment of this application;

[0017] Figure 5 This is a schematic diagram of the structure of the partition plate in an embodiment of this application;

[0018] Figure 6 This is a partial structural schematic diagram of the battery pack according to an embodiment of this application;

[0019] Figure 7 This is a partial structural schematic diagram of the battery pack according to an embodiment of this application;

[0020] Figure 8 This is a partial structural schematic diagram of the battery pack according to an embodiment of this application;

[0021] Figure 9 This is a partial structural schematic diagram of the battery pack according to an embodiment of this application;

[0022] Figure 10 This is yet another structural schematic diagram of the partition plate according to an embodiment of this application;

[0023] Figure 11 This is yet another structural schematic diagram of the partition plate according to an embodiment of this application;

[0024] Figure 12 This is a partial structural schematic diagram of the battery pack according to an embodiment of this application.

[0025] Attached image labels:

[0026] 100. Battery pack; 10. Battery group; 1. Battery cell; 11. First side; 12. Second side; 13. Terminal post; 2. Separator; 21. Buffer chamber; 22. Hollowed-out area; 23. Flow channel; 3. Conductive busbar; 4. Adhesive layer; 41. First adhesive part; 42. Second adhesive part; 5. Buffer plate; 31. Separator beam; 32. Isolation compartment beam; 40. Box body; 42. Battery compartment; 43. Electrical compartment.

[0027] X: First direction; Y: Second direction; Z: Altitude direction. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this application. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0030] Many specific details are set forth in the following description to provide a full understanding of this application. However, this application can be implemented in many other ways than those described herein, and those skilled in the art can make similar extensions without departing from the spirit of this application; therefore, this application is not limited to the specific embodiments disclosed below. Techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and apparatus should be considered part of the specification.

[0031] The terminology used in one or more embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the one or more embodiments of this application. The singular forms “a,” “the,” and “the” used in one or more embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” used in one or more embodiments of this application refers to and includes any or all possible combinations of one or more associated listed items.

[0032] It should be understood that although the terms first, second, etc., may be used to describe various information in one or more embodiments of this application, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first may also be referred to as second without departing from the scope of one or more embodiments of this application, and similarly, second may also be referred to as first. Depending on the context, the word “if” as used herein may be interpreted as “when”, “in response to a determination”, or “upper”, “lower”, “front”, “back”, “left”, “right”, etc., are used only to indicate the relative positional relationship between related parts, and not to limit the absolute position of these related parts. In this document, “equal”, “same”, etc., are not strict mathematical and / or geometric limitations, and also include errors that are understandable to those skilled in the art and permissible in manufacturing or use. Unless otherwise stated, numerical ranges in this document include not only the entire range within its two endpoints, but also several sub-ranges contained therein.

[0033] like Figures 1 to 12 As shown, this application provides a battery pack 100, which includes at least a housing 40, a partition beam 31, at least two battery packs 10, and at least two partition plates 2. The housing 40 includes a base plate and a frame fixed to the outer periphery of the base plate. The base plate and the frame form a receiving cavity for accommodating various structures required for the battery pack 100.

[0034] Specifically, the aforementioned enclosure can be a closed or semi-closed structure made of materials such as metal or plastic. It serves as the physical carrier of the battery pack, and its design and manufacturing must meet the safety, reliability, and functionality requirements of the battery pack under different usage scenarios. The enclosure provides installation space for the battery pack, BMS, cooling system, electrical connection components, etc., and through reasonable structural design, fixes these components inside the enclosure to ensure that they maintain a relatively stable position during battery pack operation, avoiding damage to components or loosening of connections due to vibration, impact, or other factors.

[0035] The enclosure may include a lower enclosure and an upper enclosure. The lower enclosure includes a base plate and a frame connecting to and surrounding the base plate. The upper enclosure is connected to the frame and has a cover plate opposite to the base plate. The upper and lower enclosures together form a receiving cavity. The frame and base plate can be integrally formed or manufactured separately and then fixedly connected. Specifically, the frame and base plate are fixedly connected by welding, riveting, screwing, etc. In the case of a cubic enclosure, the frame of the lower enclosure generally has four side plates surrounding the perimeter of the base plate. In other embodiments, the shape of the enclosure can also be cylindrical or other shapes. The frame mainly serves to support, protect, and connect. The frame can be formed by splicing multiple beams together. The frame can be rectangular, circular, polygonal, etc., without limitation. The beams of the frame can be solid structures or contain cavities. The base plate is the main load-bearing component of the battery pack, used to support and fix the battery pack, battery management system, cooling system, and other components inside the battery pack. The enclosure can be cast from materials such as steel and aluminum alloy, or lightweight materials such as glass fiber reinforced composite materials and carbon fiber reinforced composite materials.

[0036] A partition beam is installed within the housing cavity to divide the cavity into at least two sub-spaces, which can serve as battery compartments. The partition beam can be a strip structure, with its two ends connected to the two sides of the housing frame, thus dividing the housing into two sub-spaces located on either side of the partition beam. The partition beam can be made of metal or integrally molded using rubber injection molding, plastic injection molding, or molding molding. The plastic used in plastic injection molding can be polyethylene, polypropylene, ABS, PA, polystyrene, etc. The partition beam can be manufactured by die casting or other methods such as extrusion molding, and then welded to the housing.

[0037] like Figures 1 to 3 As shown, the partition beam 31 is configured to extend along a first direction of the battery pack and be fixedly connected to the frame and / or base plate to divide the cavity into at least two battery compartments 44 distributed along the first direction, with each battery pack 10 correspondingly disposed in each battery compartment 44.

[0038] like Figures 1 to 4 As shown, the battery pack 10 includes at least a plurality of battery cells 1 arranged in an array along a first direction and a second direction. Both the first and second directions are parallel to the large surface of the base plate. When both directions are parallel to the large surface of the base plate, it is clear that both directions are perpendicular to the height direction of the battery cells 1, and the first and second directions are also perpendicular to each other; that is, the height direction of the battery cells 1 is perpendicular to the base plate of the housing 40.

[0039] Among them, a row of battery cells 1 arranged along the first direction is a battery row, and a row of battery cells 1 arranged along the second direction is a battery column.

[0040] The battery cell 1 has a first side 11 perpendicular to a first direction and a second side 12 perpendicular to a second direction, and the width of the first side 11 is greater than the width of the second side 12. The width of the first side 11 is the dimension of the first side 11 parallel to the second direction; the width of the second side 12 is the dimension of the second side 12 parallel to the first direction.

[0041] Each battery cell 1 within the battery pack 10 is electrically connected to each other to facilitate the output of electrical energy from the battery pack 10. Since the battery cell 1 has a first side 11 perpendicular to the first direction and a second side 12 perpendicular to the second direction, and the width of the first side 11 is greater than the width of the second side 12, that is, the first side 11 is the larger side of the battery cell 1 in this embodiment of the application, and the second side 12 is the smaller side of the battery cell 1 in this embodiment of the application.

[0042] In existing battery packs, because the battery packs inside the box are interconnected, if one battery pack experiences thermal runaway, it will quickly trigger thermal runaway of the adjacent battery packs, rendering the entire battery pack inoperable and posing a significant safety risk to electric vehicles, electric aircraft, and other equipment, as well as to personnel and the environment.

[0043] Therefore, in the battery pack of this application embodiment, by independently compartmentalizing multiple battery groups 10, different battery groups 10 can be individually connected in parallel and / or in series. The partition beam 30 can reduce the impact of thermal runaway between adjacent battery groups 10, and even if one battery group 10 experiences thermal runaway, it can prevent cascading thermal runaway between adjacent battery groups 10. The battery groups can be connected in series, parallel, or mixed, increasing the variety of application scenarios for the battery pack.

[0044] However, in order to save space, the battery pack described above only has a partition beam 31 along the first direction of the battery pack, and lacks a reinforcing beam in the second direction perpendicular to the partition beam 31. When the battery pack 10 is subjected to vibration, the partition beam 31, which is only provided along the first direction of the battery pack, is difficult to bear the pressure. This results in a greater risk of vibration deformation of the partition beam and the battery, making it easy for the battery to detach from the base plate, causing the battery to come off from the top. There is also a greater risk of breakage at the connection between the adjacent battery conductive bar and the battery terminal, which affects the overall safety of the battery.

[0045] Therefore, in order to improve the structural strength of the battery pack in the second direction according to the embodiments of this application, such as Figures 1 to 3 and Figure 5As shown, each partition plate 2 is located between two rows of battery cells 1 arranged along the first direction, and both sides of the partition plate 2 are fixedly connected to the first side 11 of at least two battery cells 1 arranged along the second direction.

[0046] In the battery pack 100 of this embodiment, since there are no crossbeams arranged along the first direction, in order to improve the overall strength in the second direction and increase the reinforcement of the housing 40 in the second direction, a partition plate 2 is provided between the two rows of battery cells 1 arranged along the first direction. Both sides of the partition plate 2 are fixedly connected to the first side 11 of at least two battery cells 1 arranged along the second direction. The partition plate 2 can strengthen the strength of the battery pack 100 in the second direction. The partition plate 2 and the battery cells 1 can be directly fixedly connected by means of bonding, riveting, welding, etc., or indirectly fixedly connected by other structures. No limitation is made here.

[0047] It is understandable that, since the width of the first side 11 is greater than the width of the second side 12, the first side 11 is the larger side of the battery cell 1, and the second side 12 is the smaller side of the battery cell 1, the partition plate 2 is fixedly connected to the first side 11 of the battery cell 1, which can improve the shear force that the battery cell 1 and the housing 40 can withstand, and ensure the connection strength between the battery pack 10 and the housing 40 in the battery pack.

[0048] Furthermore, in one embodiment of this application, the first side surface 11 is the surface with the largest area of ​​the battery cell 1. Thus, the surface with the largest area of ​​the battery cell 1 is perpendicular to the extending direction of the separator beam 31, providing optimal structural reinforcement to the battery pack 100. Figure 1 As shown in one embodiment of this application, a heat insulation pad is provided between the battery cells 1 arranged along the second direction in each battery pack 10. The heat insulation pad can prevent the spread of thermal runaway, block heat transfer, delay the spread of thermal runaway, protect the overall safety of the battery pack 100, reduce mutual compression and collision between battery cells 1, absorb vibration and shock, and extend battery life; maintain the internal temperature stability of the battery pack 100, reduce heat loss or the influence of external high temperature, ensure battery performance, and also be flame-retardant and fireproof.

[0049] In the battery pack 100 of this application embodiment, the total width of all the partition beams 31 in the second direction is A, in mm, and the total width of all the partition plates 2 in a single battery compartment 44 in the first direction is B, in mm. The widths of each partition beam and partition plate can be measured using instruments such as calipers, and then summed to obtain the total width A of all the partition beams in the second direction and the total width B of all the partition plates in a single battery compartment in the first direction.

[0050] Therefore, this application selects a batch of sample battery packs 100 with the same specifications and dimensions, and tests their performance 1 and performance 2 according to Table 1 of the following embodiments.

[0051]

[0052]

[0053] Table 1

[0054] Performance 1 is a performance test that measures the degree of deformation of the separator beam. The test method is to mark the original center line at the top of the separator beam of the battery pack along the center of the separator beam width direction, and then complete the assembly of the battery pack.

[0055] According to GB / T2423.43, the battery pack to be tested was mounted on a vibration table. The testing procedure was carried out according to GB / T2423.56. Random and fixed-frequency vibration loads were applied in each direction, and the loading sequence should preferably be random z-axis, fixed-frequency z-axis, random y-axis, fixed-frequency y-axis, random x-axis, fixed-frequency x-axis (the direction connecting the front and rear of the battery pack is the x-axis direction, and the other horizontal direction perpendicular to the x-axis direction is the y-axis direction). The vibration frequency, power spectral density (PSD), vibration time, etc., are shown in Table 2 below.

[0056]

[0057] Table 2

[0058] After the vibration test, the battery pack casing cover was removed, and the line connecting the midpoints of the two ends of the partition beam was used as the baseline. The maximum deviation between the original center line and the baseline in the width direction of the partition beam was measured. A maximum deviation greater than or equal to 3mm was considered unqualified, and a deviation less than 3mm was considered qualified.

[0059] Performance 2 is a performance test of the connection strength of the battery cell's terminals and adapter pieces. The specific test conditions and test parameters are the same as those of test 1 above. After the test, the battery cell is removed and the bottom of the terminals and adapter pieces is observed to see if the solder joints are broken. If the total number of broken solder joints exceeds 10%, it is considered unqualified, and if it does not exceed 10%, it is considered qualified.

[0060] According to the actual test results, in Examples 1-8, the total width of all partition beams 31 in the second direction is A, and the total width of all partition plates 2 in a single battery compartment 44 in the first direction is B. When A / B satisfies 0.05≤A / B≤1.5, the degree of deformation of the partition beams and the proportion of weld breakage of the battery pack 100 are relatively small, that is, both performance 1 and performance 2 are qualified.

[0061] According to the actual test results, the weld breakage rate of Comparative Example 2 exceeded 10%, and Performance 2 failed. Analysis shows that when A / B is greater than 1.5, during the use of the battery pack 100 in this embodiment, the strength in the second direction is low, and the connection strength between the battery cell 1 and the separator 2 is low. Under long-term vibration conditions, the battery cell 1 in this embodiment undergoes significant deformation in the second direction, making it prone to failure. This results in excessive deformation of the battery cell's terminals and adapter plates, leading to frequent weld breakage at the bottom of the terminals and adapter plates. Furthermore, it also easily causes the separator beam 31 to occupy a large amount of space within the battery pack 100, resulting in a lower energy density of the battery pack 100.

[0062] According to the actual test results, the deformation of the partition beam in Comparative Example 1 was greater than 3mm, and the test result was unqualified. Analysis shows that when A / B is less than 0.05, the partition plate 2 easily occupies a large amount of space within the battery pack 100 of this embodiment, resulting in a lower energy density of the battery pack 100. Furthermore, during the use of the battery pack 100 of this embodiment, under prolonged vibration conditions, the partition beam 31 is prone to deformation, with a large deviation between its original centerline and the baseline, and may even break, leading to mutual interference between the battery packs 10 in adjacent battery compartments 44.

[0063] Therefore, in the battery pack 100 of this application embodiment, the total width of all the partition beams 31 in the second direction is A, and the total width of all the partition plates 2 in a single battery compartment 44 in the first direction is B. When A / B satisfies 0.05≤A / B≤1.5, the structural strength of the battery pack 100 of this application embodiment in the first and second directions can be effectively guaranteed, thereby ensuring that the battery pack 100 of this application embodiment can work normally under long-term vibration conditions, and the energy density of the battery pack 100 of this application embodiment can also be effectively improved.

[0064] Specifically, in the battery pack 100 of this application embodiment, the A / B value can be 0.05, 1.5, etc., as long as 0.05≤A / B≤1.5 is satisfied.

[0065] In one embodiment of this application, the total width A of all the partition beams in the second direction satisfies 8≤A≤105, in mm.

[0066] According to the actual test results, in Examples 1-6, the total width A of all partition beams 31 in the second direction satisfies 8≤A≤105, and the deformation of the partition beams in the test results is less than or equal to 2.8mm, which is excellent; in Example 7, the total width A of all partition beams 31 in the second direction does not satisfy 8≤A≤105, and the deformation of the partition beams in the test results is 3mm, which is relatively poor.

[0067] Therefore, when the total width A of all the partition beams in the second direction satisfies 8 ≤ A ≤ 105 mm, not only can the space occupied by the partition beams be effectively saved to improve the energy density of the battery pack in this embodiment, but the structural strength of the partition beams can also be guaranteed, avoiding deformation under long-term vibration conditions and improving the overall structural strength of the battery pack. When the total width A of all the partition beams in the second direction is less than 8 mm, the structural strength of the partition beams is low, and they are prone to deformation under long-term vibration conditions, affecting the overall structural strength of the battery pack. When the total width A of all the partition beams in the second direction is greater than 105 mm, the space occupied by the partition beams is too large, affecting the energy density of the battery pack in this embodiment.

[0068] In one embodiment of this application, the total width B of all partitions in a single battery compartment in the first direction satisfies 52.5≤B≤400, in mm.

[0069] According to the actual test results, in Examples 1-6, the total width B of all partitions in a single battery compartment in the first direction satisfies 52.5≤B≤400, and the solder fracture rate in the test results is less than or equal to 8.5%, which is relatively excellent; in Example 8, the total width B of all partitions in a single battery compartment in the first direction satisfies 52.5≤B≤400, and the solder fracture rate in the test results is 9.5%, which is relatively poor.

[0070] Therefore, when the total width B of all partitions in a single battery compartment in the first direction satisfies 52.5 ≤ B ≤ 400 mm, not only can the space occupied by the partitions be effectively saved to improve the energy density of the battery pack in this embodiment, but the structural strength of the battery pack in the first direction can also be guaranteed. When the total width B of all partitions in a single battery compartment in the first direction is less than 52.5 mm, the structural strength of the battery pack in the first direction is low, and it is prone to deformation, resulting in a higher proportion of weld breakage in the test results. When the total width B of all partitions in a single battery compartment in the first direction is greater than 52.5 mm, the space occupied by the partitions is too large, affecting the energy density of the battery pack in this embodiment.

[0071] In one embodiment of this application, the distance C between two adjacent partitions in the second direction satisfies 18 ≤ C ≤ 50 mm. When the distance C between two adjacent partitions in the second direction satisfies 18 ≤ C ≤ 50 mm, it not only facilitates the arrangement of individual battery cells 1 but also ensures the structural strength of the battery pack in the first direction. When the distance C between two adjacent partitions in the second direction is greater than 50 mm, the structural strength of the battery pack in the first direction is low, making it prone to deformation; when the distance C between two adjacent partitions in the second direction is less than 18 mm, the spacing between the partitions is too small, affecting the arrangement of the individual battery cells 1.

[0072] like Figure 6 As shown, in one embodiment of this application, at least one end of the separator 2 extends beyond the end of the battery array arranged along the second direction.

[0073] When at least one end of the separator 2 extends beyond the end of the battery array arranged in the second direction, the separator 2 can effectively protect at least one end of the battery cell 1 in the second direction when the battery cell 1 vibrates in the second direction.

[0074] It is understood that, in one embodiment of this application, at least one partition plate 2 may extend beyond the end of the battery array arranged along the second direction at both ends; in another embodiment of this application, at least one partition plate 2 may have one end extending beyond the end of the battery array arranged along the second direction at one end, and the other end not extending beyond the end of the battery array arranged along the second direction at the other end.

[0075] Furthermore, in one embodiment of this application, the width of at least one separator 2 extending beyond the end of the battery column in the second direction is N(1), where N(1) satisfies N(1)≤50, in mm.

[0076] When the width of the end of at least one separator 2 extending beyond the end of the battery column in the second direction is N(1), and N(1) satisfies N(1)≤50 (in mm), the space occupied by the separator 2 in the second direction can be effectively saved, thereby improving the energy density of the battery pack 100 of this embodiment.

[0077] like Figure 6As shown, in one embodiment of this application, at least one end of at least one partition plate 2 in the second direction abuts against the partition beam 31 and / or the housing 40. When at least one end of at least one partition plate 2 in the second direction abuts against the partition beam 31 and / or the housing 40, the space occupied by the partition plate 2 in the second direction can be effectively saved while ensuring the extended length of the partition plate 2 in the second direction, thereby improving the energy density of the battery pack 100 in this embodiment.

[0078] It is understood that, in one embodiment of this application, at least one partition plate 2 abuts against the partition beam 31 and / or the box body 40 at both ends in the second direction; in another embodiment of this application, at least one partition plate 2 abuts against the partition beam 31 and / or the box body 40 at one end in the second direction, and does not abut against the partition beam 31 and / or the box body 40 at the other end.

[0079] like Figure 6 As shown, in another embodiment of this application, at least one partition plate 2 has a first gap between its two ends in the second direction and the partition beam 31 and / or the box 40; the width of the first gap in the second direction is N(2), N(2) satisfies 2≤N(1)≤30, and the unit is mm.

[0080] Since at least one partition plate 2 has a first gap between its two ends in the second direction and the partition beam 31 and / or the box 40, and the width of the first gap in the second direction is N(2), where N(2) satisfies 2≤N(1)≤30 (in mm), when the partition beam 31 vibrates in the second direction, the vibration will not be directly transmitted to the partition plate 2, and the heat generated by the battery cells 1 of the battery pack 10 is not easily transmitted to the partition beam 31 through the partition plate 2, and then to the battery pack 10 in the adjacent battery compartment 44, ensuring that each battery pack 10 will not affect each other during operation.

[0081] like Figure 6 As shown, in one embodiment of this application, at least one separator 2 has both ends located between the two ends of the battery cells 1 arranged along the second direction. This effectively saves the space occupied by the separator 2 in the second direction, thereby improving the energy density of the battery pack 100 in this embodiment.

[0082] like Figure 6 As shown, the spacing width between at least one separator 2 at both ends in the second direction and the ends of the battery array arranged along the second direction is N(3), where N(3) satisfies 5≤N(3), and the unit is mm.

[0083] Therefore, when the width of the two ends of the battery cell 1 arranged along the second direction exceeds the two ends of the separator 2 in the second direction by N(3), and N(3) satisfies 5≤N(3) in mm, it can be ensured that the connection area between the separator 2 and the battery cell 1 is sufficient, thereby ensuring that the separator 2 can provide structural strength in the second direction.

[0084] In another embodiment of this application, at least one separator 2 has a length of L(1) in the second direction, and the length of the battery column is L(2) in mm. The ratio of L(1) / L(2) satisfies 80% ≤ L(1) / L(2) ≤ 110%.

[0085] When the length L(1) of the separator 2 in the second direction and the length L(2) of the battery pack satisfy 80% ≤ L(1) / L(2) ≤ 110%, the connection area between the separator 2 and the battery cell 1 is sufficient, thus ensuring that the separator 2 can provide structural strength in the second direction. When the length L(1) of the separator 2 in the second direction and the length L(2) of the battery pack satisfy L(1) / L(2) > 110%, the separator 2 will occupy a larger length in the second direction. When the length L(1) of the separator 2 in the second direction and the length L(2) of the battery pack satisfy L(1) / L(2) < 80%, the structural strength of the separator 2 in the second direction is low, and the battery pack 10 is prone to large deformation under long-term vibration conditions.

[0086] like Figure 6 As shown, in one embodiment of this application, a partition plate 2 is provided between each two adjacent rows of battery cells 1 arranged along the first direction. Since the partition plate 2 is provided between each two adjacent rows of battery cells 1, the structural strength of the battery pack 100 in the second direction of this application embodiment can be effectively improved by the partition plate 2.

[0087] And such Figure 6 As shown, in another embodiment of this application, at least part of a row of the same battery cell 1 arranged along a first direction, one of its first sides is fixedly connected to the partition plate 2, and the other first side is disposed opposite to the first side of another row of battery cells 1.

[0088] That is, for some battery cells 1, only one first side 11 is fixedly provided with a partition plate 2, while the other first side 11 is not provided with a partition plate 2. In this way, while using the partition plate 2 to improve the structural strength of the battery pack 100 in the second direction of this application embodiment, the space occupied by the partition plate 2 can also be effectively saved, thereby improving the energy density of the battery pack 100 in this application embodiment.

[0089] In one embodiment of this application, the width of at least one partition plate 2 in the first direction is b, where b satisfies 3.5 ≤ b ≤ 8 (in mm). When the width b of at least one partition plate 2 in the first direction satisfies 3.5 ≤ b ≤ 8 (in mm), both the strength of the at least one partition plate 2 and the space occupied by the partition plate 2 can be effectively saved, thereby improving the energy density of the battery pack 100 in this embodiment. If the width b of at least one partition plate 2 in the first direction is too small, it is difficult to guarantee the strength of the at least one partition plate 2; if the width b of at least one partition plate 2 in the first direction is too small, the space occupied by the partition plate 2 is too large, affecting the energy density of the battery pack 100 in this embodiment.

[0090] like Figure 7 As shown, in one embodiment of this application, at least one separator 2 extends beyond the top surface of the battery cell 1 in the height direction of the battery pack 10. When at least one separator 2 extends beyond the top surface of the battery cell 1 in the height direction of the battery pack 10, the connection area between the separator 2 and the battery cell 1 is effectively ensured to be sufficient, thereby ensuring that the separator 2 can provide structural strength in the second direction.

[0091] Similarly, in another embodiment of this application, in the height direction of the battery pack 10, the lower end of at least one separator 2 extends beyond the bottom surface of the battery cell 1. When the lower end of at least one separator 2 extends beyond the bottom surface of the battery cell 1 in the height direction of the battery pack 10, it can effectively ensure that the connection area between the separator 2 and the battery cell 1 is sufficient, thereby ensuring that the separator 2 can provide structural strength in the second direction.

[0092] Furthermore, in one embodiment of this application, in the height direction of the battery pack 10, the upper end of the separator 2 extends beyond the top surface of the battery cell 1 by a length of N(4), where N(4) satisfies N(4)≤5, and the unit is mm.

[0093] When the upper end of the separator 2 extends beyond the top surface of the battery cell 1 by a length of N(4), where N(4) ≤ 5 and the unit is mm, it can ensure that the connection area between the separator 2 and the battery cell 1 is sufficient, and can also effectively save the space occupied by the separator 2, thereby improving the energy density of the battery pack 100 in this embodiment of the application.

[0094] Similarly, in one embodiment of this application, in the height direction of the battery pack 10, the lower end of the separator 2 extends beyond the bottom surface of the battery cell 1 by a length of N(5), where N(5) satisfies N(5)≤5, and the unit is mm.

[0095] When the length of the lower end of the separator 2 extending beyond the bottom surface of the battery cell 1 is N(5), and N(5) satisfies N(5)≤5 (in mm), it can ensure that the connection area between the separator 2 and the battery cell 1 is sufficient, and can also effectively save the space occupied by the separator 2, thereby improving the energy density of the battery pack 100 in this embodiment of the application.

[0096] In one embodiment of this application, in the height direction of the battery pack 10, the upper end of at least one separator 2 does not extend beyond the top surface of the battery cell 1. By ensuring that the upper end of at least one separator 2 does not extend beyond the top surface of the battery cell 1, the space occupied by the separator 2 can be further saved, thereby increasing the energy density of the battery pack 100 of this embodiment.

[0097] Similarly, in one embodiment of this application, in the height direction of the battery pack 10, the lower end of at least one separator 2 is higher than the bottom surface of the battery cell 1. With the lower end of at least one separator 2 higher than the bottom surface of the battery cell 1, the space occupied by the separator 2 can be further saved, thereby increasing the energy density of the battery pack 100 of this embodiment.

[0098] Furthermore, in one embodiment of this application, in the height direction of the battery pack 10, the top surface of the battery cell 1 extends beyond the upper end of the separator 2 by a length of N(6), where N(6) ≤ 5, and the unit is mm. When the top surface of the battery cell 1 extends beyond the upper end of the separator 2 by a length of N(6), where N(6) ≤ 5, and the unit is mm, sufficient connection area between the separator 2 and the battery cell 1 can be ensured, and the space occupied by the separator 2 can be effectively saved, thereby improving the energy density of the battery pack 100 in this embodiment of the application.

[0099] Similarly, in one embodiment of this application, in the height direction of the battery pack 10, the length by which the top surface of the battery cell 1 is higher than the lower end of the separator 2 is N(7), where N(7) ≤ 5, and the unit is mm. When the length by which the top surface of the battery cell 1 is higher than the lower end of the separator 2 is N(7), and N(7) ≤ 5, the connection area between the separator 2 and the battery cell 1 is sufficient, and the space occupied by the separator 2 is effectively saved, thereby improving the energy density of the battery pack 100 in this embodiment of the application.

[0100] like Figure 8As shown, in one embodiment of this application, a buffer plate 5 is provided above and / or below at least one separator plate 2. The buffer plate 5 is at least partially attached to the first side 11 of the battery cell 1, and the elastic modulus of the buffer plate 5 is less than that of the separator plate 2. The upper part of the separator plate 2 is the side away from the bottom plate of the housing in the height direction, and the lower part of the separator plate 2 is the side close to the bottom plate of the housing in the height direction.

[0101] By providing a buffer plate 5 above and / or below at least one separator plate 2, and since the buffer plate 5 is at least partially attached to the first side 11 of the battery cell 1, and the elastic modulus of the buffer plate 5 is less than that of the separator plate 2, the buffer plate 5 can effectively mitigate the vibration of the separator plate 2 in the height direction of the battery cell 1, and can also mitigate the vibration between adjacent battery cells 1. Specifically, the material of the buffer plate 5 can be any one of PU foam, EPDM foam, polychloroprene foam, or silicone rubber foam, etc., without limitation.

[0102] Furthermore, in one embodiment of this application, the elastic modulus of the buffer plate 5 is F, where F satisfies 0.01 ≤ F ≤ 0.8, in Pa. When the elastic modulus F of the buffer plate 5 satisfies 0.01 ≤ F ≤ 0.8, in Pa, the buffer plate 5 can effectively mitigate the vibration of the separator 2 in the height direction of the battery cell 1, and also mitigate the vibration between adjacent battery cells 1, providing a certain level of support strength. When the elastic modulus F of the buffer plate 5 is less than 0.01 Pa, the support strength is too poor; when the elastic modulus F of the buffer plate 5 is greater than 0.8 Pa, the support strength is also too poor, making it difficult to mitigate the vibration of the separator 2 in the height direction of the battery cell 1, and also difficult to mitigate the vibration between adjacent battery cells 1.

[0103] like Figure 9 As shown, in one embodiment of this application, the separator 2 is bonded and fixed to the first side 11 of the battery cell 1 by an adhesive layer 4. Since the separator 2 is bonded and fixed to the first side 11 of the battery cell 1 by the adhesive layer 4, the fixed connection between each separator 2 and the first side 11 of the battery cell 1 can be easily and conveniently achieved.

[0104] Furthermore, in one embodiment of this application, the thickness of the adhesive layer 4 in the first direction is j, where j satisfies 0.3 ≤ j ≤ 2, and the unit is mm. Since the thickness of the adhesive layer 4 in the first direction is j, where j satisfies 0.3 ≤ j ≤ 2, and the unit is mm, it effectively saves the space occupied by the separator 2 while ensuring a tight bond between the separator 2 and the battery cell 1 through the adhesive layer 4, thereby improving the energy density of the battery pack 100 in this embodiment. If the thickness j of the adhesive layer 4 in the first direction is less than 0.3 mm, it is difficult to ensure a tight bond between the separator 2 and the battery cell 1 through the adhesive layer 4; if the thickness j of the adhesive layer 4 in the first direction is greater than 2 mm, the thickness occupied by the adhesive layer 4 is too large, affecting the energy density of the battery pack 100 in this embodiment.

[0105] like Figure 9 As shown, the adhesive layer 4 includes a first adhesive portion 41 covering the top edge of the battery cell 1 and a second adhesive portion 42 covering the bottom edge of the battery cell 1 in the height direction, with the first adhesive portion 41 and the second adhesive portion 42 spaced apart. Because the first adhesive portion 41 and the second adhesive portion 42 are spaced apart, sufficient space can be provided for the expansion of the middle region of the first side surface 11 in the battery cell 1, preventing the separator 2 and the adhesive layer from excessively compressing the middle region of the first side surface 11 of the battery cell 1.

[0106] Furthermore, in one embodiment of this application, a buffer is provided between the first adhesive portion 41 and the second adhesive portion 42 in the height direction of the battery cell 1. The buffer can support the gap between the first adhesive portion 41 and the second adhesive portion 42, effectively reduce the vibration of the battery cell 1, and leave sufficient space for the expansion of the middle region of the first side 11 in the battery cell 1.

[0107] In one embodiment of this application, the height of the battery cell 1 is H(1) in the height direction, and the sum of the heights of the first adhesive part 41 and the second adhesive part 42 is H(7) in the height direction. H(7) / H(1) satisfies 3%≤H(3) / H(1)≤50%.

[0108] When the height H(1) of battery cell 1 and the sum of the heights of the first adhesive portion 41 and the second adhesive portion 42, H(7), satisfy 3% ≤ H(7) / H(1) ≤ 50%, it is possible not only to ensure that the separator 2 and battery cell 1 are tightly bonded through the adhesive layer 4, but also to leave sufficient space for the expansion of the middle area of ​​the first side 11 in battery cell 1. When the height H(1) of battery cell 1 and the sum of the heights of the first adhesive portion 41 and the second adhesive portion 42, H(7), satisfy H(7H(1)) < 3%, it is difficult to ensure that the separator 2 and battery cell 1 are tightly bonded through the adhesive layer 4. When the height H(1) of battery cell 1 and the sum of the heights of the first adhesive portion 41 and the second adhesive portion 42, H(7), satisfy H(7H(1)) > 5%, it is impossible to leave sufficient space for the expansion of the middle area of ​​the first side 11 in battery cell 1.

[0109] like Figure 2 As shown, in one embodiment of this application, a terminal post 13 is provided on the top surface of a battery cell 1, and two adjacent battery cells 1 terminal posts 13 are electrically connected by a conductive busbar 3; at least a portion of the conductive busbar 3 extends along a first direction, and / or at least a portion of the conductive busbar 3 extends along a second direction.

[0110] It is understandable that, since the top surface of the battery cell 1 is provided with a terminal post 13, the terminals 13 of two adjacent battery cells 1 are electrically connected through a conductive bus 3. The conductive bus 3 can electrically connect two adjacent battery cells 1 in series and / or in parallel.

[0111] Furthermore, in one embodiment of this application, when a pole post 13 is provided on the top surface of a battery cell 1 and the pole posts 13 of two adjacent battery cells 1 are electrically connected by a conductive busbar 3, the total width A of all the partition beams 31 in the second direction and the total width B of all the partition plates 2 in a single battery compartment 44 in the first direction satisfy 0.08≤A / B≤1.5.

[0112] Since each battery cell 1 has a terminal post 13 on its top surface, and the terminals 13 of two adjacent battery cells 1 are electrically connected by a conductive busbar 3, at least a portion of the conductive busbar 3 extends along the first direction and / or at least a portion of the conductive busbar 3 extends along the second direction. The conductive busbar 3 can provide structural strength to the battery pack 10 in the first and / or second directions. In this way, when the total width A of all the partition beams 31 in the second direction and the total width B of all the partition plates 2 in a single battery compartment 44 in the first direction satisfy 0.08≤A / B≤1.5, the structural strength of the battery pack 100 in the first and second directions of this application embodiment can be further improved, thereby ensuring that the battery pack 100 of this application embodiment can work normally under long-term vibration conditions, and can also effectively improve the energy density of the battery pack 100 of this application embodiment.

[0113] In one embodiment of this application, at least one separator 2 and a conductive bar 3 have a second gap in the height direction of the battery cell 1; the length of the second gap in the height direction of the battery cell 1 is N(7), where N(7) satisfies 5≤N(7)≤40, and the unit is mm. When at least one separator 2 and a conductive bar 3 have a second gap N(7) in the height direction of the battery cell 1, where N(7) satisfies 5≤N(7)≤40, and the unit is mm, it can effectively prevent the separator 2 from colliding with the conductive bar 3 when it vibrates along the height direction of the battery cell 1.

[0114] In one embodiment of this application, at least a portion of the partition plate 2 is a heat exchange plate, which is configured to exchange heat with the first side 11 of the battery cell 1. The heat exchange between the heat exchange plate and the first side 11 of the battery cell 1 can heat and / or cool the battery cell 1 as needed, and can also improve the uniformity of temperature distribution inside the battery pack 10.

[0115] Furthermore, in one embodiment of this application, the height of the battery cell 1 is H(1) in mm, and the height of the heat exchange plate is H(2), where H(2) / H(1) satisfies 40% ≤ H(2) / H(1) ≤ 105%. Since the height H(1) of the battery cell 1 and the height H(2) of the heat exchange plate satisfy 40% ≤ H(2) / H(1) ≤ 105%, the contact area between the heat exchange plate and the first side 11 of the battery cell 1 can be effectively guaranteed, thereby improving the heat exchange efficiency between the heat exchange plate and the battery cell 1. It can also avoid the heat exchange plate being too high, which would affect the arrangement of other structures. When the height of the battery cell 1 is H(1) and the height of the heat exchange plate is H(2), satisfying 40% ≤ H(2) / H(1) < 40%, the heat exchange efficiency between the heat exchange plate and the battery cell 1 is easily affected. When the height of the battery cell 1 is H(1) and the height of the heat exchange plate is H(2), satisfying 40% ≤ H(2) / H(1) > 105%, the height of the heat exchange plate is too high, which easily affects the arrangement of other structures within the battery pack 100. Specifically, such as Figure 5 As shown, in one embodiment of this application, the heat exchange plate is provided with at least one flow channel 23, and a heat exchange liquid flows through the flow channel 23. Because the heat exchange plate has at least one flow channel 23, and a heat exchange liquid flows through the flow channel 23, the heat exchange plate can utilize the flowing heat exchange liquid for heat exchange, ensuring that the battery cell 1 operates within its optimal operating range. It is understood that the heat exchange liquid can be water, oil, ethylene glycol aqueous solution, etc., and is not limited thereto.

[0116] Furthermore, in one embodiment of this application, when at least one flow channel 23 is provided in the heat exchange plate, the total width A of all the partition beams 31 in the second direction and the total width B of all the partition plates 2 in the first direction in a single battery compartment 44 satisfy 0.05≤A / B≤1.4.

[0117] It is understood that since at least one flow channel 23 is provided in the heat exchange plate, the strength of the heat exchange plate in its thickness direction will be weakened. Therefore, when at least one flow channel 23 is provided in the heat exchange plate, if the total width A of all the partition beams 31 in the second direction and the total width B of all the partition plates 2 in the first direction in a single battery compartment 44 satisfy 0.05≤A / B≤1.4, the structural strength of the battery pack 100 in the first and second directions of this application embodiment can be improved, thereby ensuring that the battery pack 100 of this application embodiment can work normally under long-term vibration conditions, and can also effectively improve the energy density of the battery pack 100 of this application embodiment.

[0118] In one embodiment of this application, the flow channel 23 extends along a direction perpendicular to the height of the battery cell 1; and in the height direction of the battery cell 1, the height of the battery cell 1 is H(1), in mm, and the sum of the heights of each flow channel 23 is H(3), in mm, and H(3) / H(1) satisfies 45%≤H(3) / H(1)≤100%. When the height of the battery cell 1 is H(1) and the sum of the heights of each flow channel 23 is H(3), which satisfies 45%≤H(3) / H(1)≤100%, the heat exchange area between the flow channel 23 and the first side 11 of the battery cell 1 can be effectively guaranteed, thereby effectively guaranteeing the heat exchange efficiency between the heat exchange plate and the battery cell 1. When the height H(1) of the battery cell 1 and the sum of the heights H(3) of each flow channel 23 satisfy H(3) / H(1) is less than 45%, the heat exchange area between the flow channel 23 and the first side 11 of the battery cell 1 is too small, and the heat exchange efficiency between the heat exchange plate and the battery cell 1 is low. When the height H(1) of the battery cell 1 and the sum of the heights H(3) of each flow channel 23 satisfy H(3) / H(1) is greater than 100%, the height of the heat exchange plate is too high, which can easily affect the arrangement of other structures in the battery pack 100.

[0119] In one embodiment of this application, the partition plate 2 is an epoxy resin board or a metal plate with insulating elements 6 on both sides. When the partition plate 2 is an epoxy resin board or a metal plate with insulating elements 6 on both sides, it is not only easy to process, but also effectively provides supporting strength.

[0120] Furthermore, in one embodiment of this application, the elastic modulus of the separator 2 is E, where E satisfies 1 ≤ E ≤ 10, and the unit is Pa. When the elastic modulus of the separator 2 is E, and E satisfies 1 ≤ E ≤ 10, and the unit is Pa, the separator 2 can effectively mitigate the vibration of the battery cell 1 in the first direction and provide a certain supporting strength.

[0121] In one embodiment of this application, at least a portion of the partition plate 2 is a heat insulation plate with a thermal conductivity of k, where k satisfies 0.1 ≤ k ≤ 15, and the unit is W / (m·K). When at least a portion of the partition plate 2 is a heat insulation plate with a thermal conductivity of k, where k satisfies 0.1 ≤ k ≤ 15, and the unit is W / (m·K), it can prevent the thermal runaway propagation of adjacent battery cells 1, block heat transfer, delay the spread of thermal runaway, and protect the overall safety of the battery pack 100; it also maintains a stable internal temperature of the battery pack 100, reduces heat loss or the influence of external high temperatures, ensures battery performance, and can also provide flame retardancy and fire prevention. When the thermal conductivity k of the heat insulation plate is too high, it is difficult to achieve a heat insulation effect.

[0122] like Figure 2 As shown, in one embodiment of this application, either end of the partition plate 2 in the second direction is fixedly connected to either the housing 40 or the partition beam 31. Because either end of the partition plate 2 in the second direction is fixedly connected to either the housing 40 or the partition beam 31, the structural strength of the battery pack 100 in the second direction of this embodiment can be further improved.

[0123] Furthermore, when either end of the partition plate 2 is fixedly connected to either the housing 40 or the partition beam 31 in the second direction, the total width of all partition beams 31 in the second direction is A (in mm), and the total width of all partition plates 2 in a single battery compartment 44 in the first direction is B (in mm), where A / B satisfies 0.1 ≤ A / B ≤ 1.5. This further improves the structural strength of the battery pack 100 in both the first and second directions, thereby ensuring the normal operation of the battery pack 100 under long-term vibration conditions and effectively increasing the energy density of the battery pack 100.

[0124] like Figure 11 As shown, in one embodiment of this application, at least two buffer chambers 21 are provided in the partition plate 2; in the height direction of the battery cell 1, the distance between adjacent buffer chambers 21 is H(4), in mm, and H(4) satisfies 1≤H(4)≤35.

[0125] Since the separator 2 has at least two buffer chambers 21, and the distance H(4) between adjacent buffer chambers 21 in the height direction of the battery cell 1 satisfies 1≤H(4)≤35, the buffer chambers 21 can provide sufficient space for the expansion of the first side 11 of the battery cell 1, avoiding excessive pressure from the separator 2 on the first side 11 of the battery cell 1. When the distance H(4) between adjacent buffer chambers 21 is less than 1mm, the strength of the separator 2 itself is low; when the distance H(4) between adjacent buffer chambers 21 is greater than 35mm, it is difficult to achieve a buffering effect.

[0126] like Figure 10 As shown, in one embodiment of this application, in the height direction of the battery cell 1, the separator 2 is configured such that the width of the upper and lower ends is greater than the width of the middle region. Since the width of the upper and lower ends of the separator 2 is greater than the width of the middle region in the height direction of the battery cell 1, sufficient space can be provided for the expansion of the middle region of the first side 11 of the battery cell 1, and the separator 2 is prevented from excessively compressing the middle region of the first side 11 of the battery cell 1.

[0127] like Figure 12 As shown, in one embodiment of this application, a hollow area 22 is formed in the middle region of the separator 2 in the height direction of the battery cell 1; and in the height direction of the battery cell 1, the height of the separator 2 is H(5), in mm, and the height of the hollow area 22 is H(6), in mm, and H(6) / H(5) satisfies 33%≤H(6) / H(5)≤99%. Since the hollow area 22 is formed in the middle region of the separator 2, and the heights H(5) and H(6) of the hollow area 22 satisfy 33%≤H(6) / H(5)≤99%, it can not only leave enough space for the expansion of the middle region of the first side 11 in the battery cell 1, avoiding excessive pressure of the separator 2 on the middle region of the first side 11 of the battery cell 1, but also ensure the structural strength of the separator 2 in its thickness direction.

[0128] like Figure 1 and Figure 2 As shown, in one embodiment of this application, the battery pack 100 of this application embodiment further includes an isolation compartment beam 32; the isolation compartment beam 32 extends along the second direction of the battery pack 100 to divide the electrical compartment 43 within the receiving cavity; the electrical compartment 43 is separated from each battery compartment 44 by the isolation compartment beam 32.

[0129] It is understood that the battery pack 100 in this embodiment of the application is separated into an electrical compartment 43 by an isolation compartment beam 32. The electrical compartment 43 can be used to arrange various electrical components required by the battery pack 100, such as the battery pack 100 circuit breaker unit (BDU), battery management system (BMS), and input / output interfaces, etc.

[0130] Specifically, in one embodiment of this application, where the battery pack 100 further includes an isolation beam 32 extending along the second direction of the battery pack 100, the total width of all the isolation beams 31 in the second direction is A (in mm), and the total width of all the partition plates 2 in a single battery compartment 44 in the first direction is B (in mm), and A / B satisfies 0.08 ≤ A / B ≤ 1.5. This further improves the structural strength of the battery pack 100 in both the first and second directions, thereby ensuring the normal operation of the battery pack 100 under long-term vibration conditions and effectively improving the energy density of the battery pack 100.

[0131] In one embodiment of this application, the electrical compartment 43 is sealed and isolated from each battery compartment 44. Because the electrical compartment 43 is sealed and isolated from each battery compartment 44, when a single battery cell 1 in the battery compartment 44 experiences thermal runaway and ejects a large amount of high-temperature, high-pressure gas, the high-temperature, high-pressure gas can be prevented from flowing into the electrical compartment 43. This prevents the high-temperature, high-pressure gas generated by battery thermal runaway from affecting the normal operation of electrical components within the electrical compartment 43, thereby ensuring that the battery pack 100 of this embodiment can continue to supply power normally for a period of time, thus improving the safety of the battery pack 100 when applied to electric vehicles and other equipment.

[0132] Similarly, in one embodiment of this application, the individual battery compartments 44 are sealed and isolated from each other. Because the individual battery compartments 44 are sealed and isolated, if a battery cell 1 in one battery compartment 44 experiences thermal runaway and ejects a large amount of high-temperature, high-pressure gas, the high-temperature, high-pressure gas can be prevented from flowing into other battery compartments 44. This prevents the high-temperature, high-pressure gas generated by the battery thermal runaway from affecting the normal operation of the battery cells 1 in other battery compartments 44, thereby ensuring that the battery pack 100 of this embodiment can continue to supply power normally for a period of time, thus improving the safety of the battery pack 100 when applied to electric vehicles and other equipment.

[0133] In one embodiment of this application, the battery packs 10 in each battery compartment 44 are electrically connected to each other in series and / or parallel. It is understood that when the battery packs 10 in each battery compartment 44 are electrically connected to each other in series, sufficient voltage can be effectively guaranteed to be output; when the battery packs 10 in each battery compartment 44 are electrically connected to each other in parallel, the battery pack 100 in this embodiment of the application can be guaranteed to meet the set capacity.

[0134] This application also provides an electrical device that includes at least one of the aforementioned battery packs 100. It is understood that this electrical device can be various types of electrical devices, such as electric vehicles, battery-powered appliances, and energy storage devices, and is not limited thereto.

[0135] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications or equivalent substitutions made within the spirit and principles of this application should be included within the protection scope of this application.

[0136] Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein. The scope of this application is defined by the appended claims.

Claims

1. A battery pack, characterized in that, include: The box includes a base plate and a frame fixed to the outer periphery of the base plate, the base plate and the frame forming a receiving cavity; A partition beam is configured to extend along a first direction of the battery pack and be fixedly connected to the frame and / or base plate to divide the receiving cavity into at least two battery compartments distributed along the first direction. At least two battery packs are provided, each battery pack being disposed in a corresponding battery compartment. Each battery pack includes at least a plurality of battery cells arranged in an array along a first direction and a second direction. The first direction and the second direction are parallel to the large surface of the base plate. Each battery cell has a first side perpendicular to the first direction and a second side perpendicular to the second direction, and the width of the first side is greater than the width of the second side. At least two partition plates, at least one of the partition plates is located between two rows of battery cells arranged along a first direction, and both sides of the partition plate are fixedly connected to the first side of at least two battery cells arranged along a second direction; Wherein, the total width of all the partition beams in the second direction is A, in mm, and the total width of all the partition plates in a single battery compartment in the first direction is B, in mm, and A / B satisfies 0.05≤A / B≤1.

5.

2. The battery pack according to claim 1, characterized in that, At least one end of the separator extends beyond the end of the battery array arranged along the second direction.

3. The battery pack according to claim 2, characterized in that, The width of at least one of the separator plates extending beyond the end of the battery column in the second direction is N(1), where N(1) ≤ 50, in mm.

4. The battery pack according to claim 2, characterized in that, At least one of the partition plates abuts against the partition beam and / or the box body at both ends in the second direction.

5. The battery pack according to claim 2, characterized in that, At least one of the partition plates has a first gap between at least one end in the second direction and the partition beam and / or the box body; the width of the first gap in the second direction is N(2), N(2) satisfies 2≤N(1)≤30, in mm.

6. The battery pack according to claim 1, characterized in that, At least one of the separator plates is located between the two ends of the battery array arranged along the second direction.

7. The battery pack according to claim 6, characterized in that, The spacing width between at least one of the separator plates at both ends in the second direction and the ends of the battery array arranged along the second direction is N(3), where N(3) satisfies 5≤N(3), and the unit is mm.

8. The battery pack according to claim 6, characterized in that, At least one of the separators has a length of L(1) in the second direction, in mm, and the battery array has a length of L(2) in mm, where L(1) / L(2) satisfies 80% ≤ L(1) / L(2) ≤ 110%.

9. The battery pack according to claim 1, characterized in that, The separator plate is provided between each of the two adjacent columns of battery cells arranged along the first direction.

10. The battery pack according to claim 1, characterized in that, At least partially, one of the first sides of a column of the same battery cells arranged along a first direction is fixedly connected to the partition plate, and the other first side is disposed opposite to the first side of another column of battery cells.

11. The battery pack according to claim 1, characterized in that, At least one of the partition plates has a width of b in the first direction, where b satisfies 3.5 ≤ b ≤ 8, and the unit is mm.

12. The battery pack according to claim 1, characterized in that, In the height direction of the battery pack, the upper end of at least one of the partition plates extends beyond the top surface of the battery cell; And / or, in the height direction of the battery pack, the lower end of at least one of the separators extends beyond the bottom surface of the battery cell.

13. The battery pack according to claim 12, characterized in that, In the height direction of the battery pack, the upper end of the separator extends beyond the top surface of the battery cell by a length of N(4), where N(4) ≤ 5, and the unit is mm; And / or, in the height direction of the battery pack, the lower end of the separator extends beyond the bottom surface of the battery cell by a length of N(5), where N(5) ≤ 5, and the unit is mm.

14. The battery pack according to claim 1, characterized in that, In the height direction of the battery pack, the upper end of at least one of the partition plates does not extend beyond the top surface of the battery cell; And / or, in the height direction of the battery pack, the lower end of at least one of the separators does not extend beyond the bottom surface of the battery cell.

15. The battery pack according to claim 14, characterized in that, In the height direction of the battery pack, the length by which the top surface of the battery cell extends beyond the upper end of the separator plate is N(6), where N(6) satisfies N(6)≤5, and the unit is mm; And / or, in the height direction of the battery pack, the length by which the top surface of the battery cell is higher than the lower end of the separator is N(7), where N(7) satisfies N(7)≤5, and the unit is mm.

16. The battery pack according to claim 1, characterized in that, A buffer plate is provided above and / or below at least one of the separator plates, the buffer plate being at least partially attached to a first side of the battery cell, and the elastic modulus of the buffer plate being less than that of the separator plate.

17. The battery pack according to claim 16, characterized in that, The elastic modulus of the buffer plate is F, which satisfies 0.01≤F≤0.8, and the unit is GPa.

18. The battery pack according to claim 1, characterized in that, The separator is bonded and fixed to the first side of the battery cell by an adhesive layer.

19. The battery pack according to claim 18, characterized in that, The thickness of the adhesive layer in the first direction is j, where j satisfies 0.3≤j≤2, and the unit is mm.

20. The battery pack according to claim 18, characterized in that, The adhesive layer includes a first adhesive portion covering the top edge of the battery cell and a second adhesive portion covering the bottom edge of the battery cell in the height direction of the battery cell, with the first adhesive portion and the second adhesive portion spaced apart.

21. The battery pack according to claim 20, characterized in that, A buffer is provided between the first adhesive portion and the second adhesive portion in the height direction of the battery cell.

22. The battery pack according to claim 20, characterized in that, In the height direction of the battery cell, the height of the battery cell is H(1), in mm, and the sum of the heights of the first adhesive part and the second adhesive part is H(7), in mm. H(7) / H(1) satisfies 3%≤H(7) / H(1)≤50%.

23. The battery pack according to claim 1, characterized in that, The top surface of each battery cell is provided with a terminal post, and the terminals of two adjacent battery cells are connected by a conductive discharge. At least a portion of the conductive busbars extend along the first direction, and / or at least a portion of the conductive busbars extend along the second direction.

24. The battery pack according to claim 23, characterized in that, The total width A of all the partition beams in the second direction and the total width B of all the partitions in a single battery compartment in the first direction satisfy 0.08 ≤ A / B ≤ 1.

5.

25. The battery pack according to claim 23, characterized in that, In the height direction of the battery cell, at least one of the separators and the conductive busbars have a second gap; the length of the second gap in the height direction of the battery cell is N(7), where N(7) satisfies 5≤N(7)≤40, and the unit is mm.

26. The battery pack according to claim 1, characterized in that, At least a portion of the separator is a heat exchange plate, which is configured to exchange heat with a first side of the battery cell.

27. The battery pack according to claim 26, characterized in that, In the height direction of the battery cell, the height of the battery cell is H(1), in mm, and the height of the heat exchange plate is H(2). H(2) / H(1) satisfies 40% ≤ H(2) / H(1) ≤ 105%.

28. The battery pack according to claim 26, characterized in that, The heat exchange plate is provided with at least one flow channel, and heat exchange liquid flows through the flow channel.

29. The battery pack according to claim 28, characterized in that, The total width A of all the partition beams in the second direction and the total width B of all the partitions in a single battery compartment in the first direction satisfy 0.05 ≤ A / B ≤ 1.

4.

30. The battery pack according to claim 28, characterized in that, The flow channel extends along a direction perpendicular to the height of the battery cell; Furthermore, in the height direction of the battery cell, the height of the battery cell is H(1), in mm, and the sum of the heights of each flow channel is H(3), in mm. H(3) / H(1) satisfies 45% ≤ H(3) / H(1) ≤ 100%.

31. The battery pack according to claim 1, characterized in that, The partition plate is an epoxy resin plate or a metal plate with insulating parts on both sides.

32. The battery pack according to claim 1, characterized in that, The elastic modulus of the partition plate is E, where E satisfies 1≤E≤10, and the unit is GPa.

33. The battery pack according to claim 1, characterized in that, At least a portion of the partition plate is a heat insulation plate, and the thermal conductivity of the heat insulation plate is k, which satisfies 0.1≤k≤15, with units of W / (m·K).

34. The battery pack according to claim 1, characterized in that, The partition plate is fixedly connected at either end of the housing or the partition beam in the second direction. The total width of all the partition beams in the second direction is A, in mm. The total width of all the partition plates in a single battery compartment in the first direction is B, in mm. A / B satisfies 0.1≤A / B≤1.

5.

35. The battery pack according to claim 1, characterized in that, The partition plate is provided with at least two buffer chambers; in the height direction of the battery cell, the distance between adjacent buffer chambers is H(4), in mm, and H(4) satisfies 1≤H(4)≤35.

36. The battery pack according to claim 1, characterized in that, In the height direction of the battery cell, the separator is configured such that the width at the top and bottom ends is greater than the width of the middle region.

37. The battery pack according to claim 1, characterized in that, In the height direction of the battery cell, a hollow area is formed in the middle region of the separator plate; Furthermore, in the height direction of the battery cell, the height of the separator plate is H(5), in mm, and the height of the hollow area is H(6), in mm. H(6) / H(5) satisfies 33%≤H(6) / H(5)≤99%.

38. The battery pack according to claim 1, characterized in that, It also includes the isolation compartment beam; The isolation beam extends along a second direction of the battery pack to divide the electrical compartment within the receiving cavity; the electrical compartment is separated from each of the battery compartments by the isolation beam.

39. The battery pack according to claim 38, characterized in that, The total width of all the partition beams in the second direction is A, in mm, and the total width of all the partitions in a single battery compartment in the first direction is B, in mm. A / B satisfies 0.08≤A / B≤1.

5.

40. The battery pack according to claim 38, characterized in that, The electrical compartment is sealed and isolated from each of the battery compartments.

41. The battery pack according to claim 1, characterized in that, The first side is the surface with the largest area of ​​the battery cell.

42. The battery pack according to claim 1, characterized in that, Each of the battery compartments is sealed and isolated from the others.

43. The battery pack according to any one of claims 1-42, characterized in that, The battery packs in each of the battery compartments are electrically connected to each other in series and / or in parallel.

44. The battery pack according to any one of claims 1-42, characterized in that, The total width A of all the partition beams in the second direction satisfies 8 ≤ A ≤ 105, in mm.

45. The battery pack according to any one of claims 1-42, characterized in that, The total width B of all the partitions in a single battery compartment in the first direction satisfies 52.5 ≤ B ≤ 400, in mm.

46. ​​The battery pack according to any one of claims 1-42, characterized in that, In the second direction, the distance C between two adjacent partitions satisfies 18≤C≤50, in mm.

47. An electrical appliance, characterized in that, It includes at least one battery pack according to any one of claims 1 to 46.

Images