CTP rolling steel battery pack and electric device

Abstract

The utility model discloses a CTP rolling steel battery pack and a power utilization device. The CTP rolling steel battery pack comprises a battery cell group, a spacer group and a battery box, and the battery cell group comprises a plurality of battery cells arranged in a first direction; the spacer group comprises at least one buffer piece arranged along the first direction, the buffer piece is clamped between at least part of adjacent battery cells, and the buffer piece can be elastically deformed and reset in the first direction; one battery cell group is arranged in the battery box or a plurality of battery cell groups are distributed in the battery box in an array mode, and the battery box is a steel part and a rolling forming part. Wherein the buffer piece changes the length of the battery cell group in the first direction through elastic deformation, so that the relative movement of the battery cells in the battery is reduced, the battery cell fixing effect is enhanced, the reliability of the battery pack is improved, and the service life of the battery pack is prolonged. The battery box is formed by rolling steel, so that the structural strength is improved, the fixing effect of the battery box on the battery cell group is further enhanced, and meanwhile, the processing efficiency of the battery box is improved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to a CTP roll-pressed steel battery pack and an electrical device. Background Art

[0002] As a power source widely used in vehicles, ships, spacecraft and other fields, the development of battery technology has received much attention. Among them, CTP (Cell to Pack) technology improves the volume utilization of the battery pack and reduces the manufacturing cost and material cost of the battery pack by eliminating the module design and directly combining the battery cell with the shell, and is widely used in power battery structures.

[0003] However, the cancellation of the module structure also brings difficulties to the CTP battery in terms of cell fixation. During the long-term use of CTP batteries, due to external forces or self-expansion, the fixation effect of the cell inside the battery is weakened, and there are collisions between the cell and the shell, which have a negative impact on the performance and service life of the battery. Utility Model Content

[0004] The embodiments of the present application provide a CTP roll-pressed steel battery pack and an electrical device, which solve the problem that the cell fixing effect of the existing battery pack is weakened after long-term use.

[0005] In the first aspect, an embodiment of the present application provides a CTP roll-formed steel battery pack, comprising a cell group, a spacer group, and a battery box, wherein the cell group comprises a plurality of cells arranged along a first direction; the spacer group comprises at least one buffer arranged along the first direction, the buffer being sandwiched between at least some adjacent cells, and the buffer being able to elastically deform and reset in the first direction; a cell group is arranged in the battery box or a plurality of cell groups are distributed in an array in the battery box, the battery box is a steel part, and the battery box is a roll-formed part.

[0006] In some embodiments, the plurality of battery cells are distributed at equal intervals along the first direction through the buffer; and / or,

[0007] At least one outer end surface of the battery cell group along the first direction is provided with a buffer, or the outer end surface of the battery cell group and the middle part of the battery cell group are provided with a buffer.

[0008] In some embodiments, the buffer has a first region and a second region, the thickness of the first region is greater than the thickness of the second region, and the orthographic projection of the first region in the first direction surrounds the second region.

[0009] In some embodiments, the spacer group further includes at least one heat sink, and at least a portion of the heat sink is accommodated in the second region.

[0010] In some embodiments, the battery box is provided with a limiting structure, and the limiting structure is arranged at two ends of at least one battery cell group along the first direction.

[0011] In some embodiments, the limiting structure includes a supporting portion for fitting the battery cell group, the supporting portion extends in a direction away from the battery cell group to form a connecting portion, and the supporting portion is connected to the battery box through the connecting portion.

[0012] In some embodiments, the support portion has a first wall for fitting the battery cell group and a second wall having a connecting portion, and a reinforcing rib is provided between the first wall and the second wall, and the reinforcing rib separates the first wall and the second wall to form a plurality of energy absorption cavities.

[0013] In some embodiments, the limiting structure is a steel part, and the limiting structure is a roll-formed part.

[0014] In some embodiments, multiple groups of battery cell groups are provided along the second direction, the number of spacer groups is equal to that of battery cell groups and they are arranged one-to-one, and a flame retardant is provided between two adjacent groups of battery cell groups along the second direction.

[0015] In a second aspect, an embodiment of the present application further provides an electrical device, which includes the CTP roll-pressed steel battery pack provided in any of the aforementioned embodiments.

[0016] The CTP roll-formed steel battery pack of the embodiment of the present application separates the cells in the cell group by a buffer, drives the buffer to undergo elastic deformation to achieve a change in the length of the cell group in the first direction, applies pressure in the first direction to the cell group, compresses the buffer to reduce the length of the cell group in the first direction, and reduces the difficulty of assembling the cell group into the battery; after the cell group is assembled, the pressure in the first direction is removed, and the buffer is elastically reset to increase the length of the cell group in the first direction, reduce the relative movement of the cells inside the battery, strengthen the cell fixation effect, improve the reliability of the battery pack, and extend the service life of the battery pack. The CTP roll-formed steel battery pack also includes a battery box formed by steel roll forming, which improves the structural strength of the battery box, further strengthens the fixing effect of the battery box on the cell group, and improves the processing efficiency of the battery box. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] Figure 1 This is a schematic diagram of the structure of a CTP roll-pressed steel battery pack provided in an embodiment of the present application;

[0019] Figure 2 yes Figure 1 The schematic diagram of the structure of the buffer for CTP roll-pressed steel battery pack shown;

[0020] Figure 3 It is another structural schematic diagram of a CTP roll-pressed steel battery pack provided in an embodiment of the present application;

[0021] Figure 4 This is a schematic diagram of the connection between the heat sink and the buffer for the CTP roll-pressed steel battery pack provided in the embodiment of the present application;

[0022] Figure 5 It is another structural schematic diagram of a CTP roll-pressed steel battery pack provided in an embodiment of the present application;

[0023] Figure 6 yes Figure 5 A structural schematic diagram of a limiting structure for a CTP roll-pressed steel battery pack is shown;

[0024] Figure 7 yes Figure 5 The schematic diagram of the structure of the battery box for CTP roll-pressed steel battery pack is shown.

[0025] The reference numerals in the specific implementation manner are as follows:

[0026] Battery cell group 10; Battery cell 100;

[0027] Buffer 210; first region 211; second region 212; heat sink 220; insulating member 230;

[0028] Limiting structure 300; supporting portion 310; first wall 311; second wall 312; reinforcing rib 313; energy absorbing cavity 314; connecting portion 320; giving way groove 330;

[0029] Battery box 400; bottom plate 410; first plate 420; first folded edge 421; second plate 430; second folded edge 431;

[0030] The first direction is X; the second direction is Y; the third direction is Z. DETAILED DESCRIPTION

[0031] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0032] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0033] It is obvious to those skilled in the art that various modifications and changes can be made in the present application without departing from the spirit or scope of the present application. Therefore, the present application is intended to cover modifications and changes of the present application that fall within the scope of the corresponding claims (technical solutions for protection) and their equivalents. It should be noted that the implementation methods provided in the embodiments of the present application can be combined with each other without contradiction.

[0034] Before describing the technical solutions provided by the embodiments of the present application, in order to facilitate the understanding of the embodiments of the present application, the present application first specifically describes the problems existing in the related art:

[0035] In recent years, batteries have been increasingly used as power sources in vehicles, ships, spacecraft and other fields, and their safety performance and service life have received close attention. Batteries are formed by multiple cells connected in series and parallel, and the cells are closely arranged inside the battery to increase the battery's energy density.

[0036] Among them, CTP (Cell to Pack) technology eliminates the module design and directly combines the battery cell with the shell, which improves the volume utilization of the battery pack and reduces the manufacturing cost and material cost of the battery pack. It is widely used in power battery structures. However, the elimination of the module structure also brings difficulties to the CTP battery in terms of battery cell fixation.

[0037] In actual production, in order to facilitate the assembly of the battery cells into the battery, an assembly gap is reserved for each group of battery cells inside the battery, which weakens the fixing effect of the battery cells inside the battery. Taking electric vehicles as an example, during use, the battery will follow the bumps of the electric vehicle, causing the battery cells to move relative to each other inside the battery and collide, causing risks such as deformation and electrolyte leakage, affecting the safety performance and service life of the battery.

[0038] In addition, after long-term use, the battery cells will expand along the thickness direction, and the fit between two adjacent battery cells will weaken. This expansion deformation will also weaken the fixation effect of the battery cells inside the battery, causing collisions between battery cells or between battery cells and batteries, affecting the safety performance and service life of the battery.

[0039] Based on this, the embodiments of the present application provide a CTP roll-formed steel battery pack and an electrical device, which can solve the problem that the existing battery cells are weakly fixed inside the battery and the battery cells move relative to each other inside the battery, affecting the safety performance and service life of the battery.

[0040] The following is combined with Figure 1 To Attachment Figure 7 The CTP roll-pressed steel battery pack and electrical device provided in the embodiments of the present application are described in detail.

[0041] See also Figure 1 The present application provides a CTP rolled steel battery pack, including a cell group 10 and a spacer group, the cell group 10 including a plurality of cells 100 arranged along a first direction; the spacer group includes at least one buffer 210 arranged along the first direction, the buffer 210 is sandwiched between at least part of adjacent cells 100, and the buffer 210 can be elastically deformed and reset in the first direction.

[0042] The first direction is the thickness direction of the battery cell 100 in the battery cell group 10 (eg, the X direction in the figure). The battery cell 100 will expand along the thickness direction after long-term use. By squeezing the buffer 210 , the effect of this expansion on the fixing effect of the battery cell 100 is reduced.

[0043] Therefore, the CTP rolled steel battery pack separates the battery cells 100 in the battery cell group 10 through the buffer 210, and realizes the length change of the battery cell group 10 in the first direction by driving the buffer 210 to undergo elastic deformation, applies pressure in the first direction to the battery cell group 10, compresses the buffer 210 to reduce the length of the battery cell group 10 in the first direction, and reduces the difficulty of assembling the battery cell group 10 into the battery pack; after the battery cell group 10 is assembled, the pressure in the first direction is removed, and the buffer 210 is elastically reset to increase the length of the battery cell group 10 in the first direction, reduce the relative movement of the battery cell 100 inside the battery pack, strengthen the fixing effect of the battery cell 100, improve the reliability of the battery pack, and extend the service life of the battery pack.

[0044] See also Figure 5 According to certain embodiments of the present application, the CTP roll-formed steel battery pack also includes a battery box 400, a battery cell group 10 is arranged in the battery box 400 or a plurality of battery cell groups 10 are distributed in an array in the battery box 400, and the battery box 400 is a steel part, and the battery box 400 is a roll-formed part.

[0045] Therefore, the structural strength of the battery box 400 is improved, the processing efficiency of the battery box 400 is improved, the cost control of the battery box 400 is facilitated, and the fixing effect of the battery box 400 on the battery cell group 10 is further enhanced.

[0046] According to some embodiments of the present application, the plurality of battery cells 100 are distributed at equal intervals along the first direction through the buffer 210 .

[0047] Exemplarily, every two battery cells 100 are separated by one buffer member 210 , or every three battery cells 100 are separated by two buffer members 210 , or each battery cell 100 is separated by two buffer members 210 .

[0048] Thus, the battery cell group 10 is arranged at equal intervals by at least one buffer member 210 , which helps each battery cell 100 in the battery cell group 10 to bear the load evenly, and reduces the possibility of deformation and damage of local battery cells 100 in the battery cell group 10 due to excessive pressure.

[0049] See also Figure 1 In some embodiments, each battery cell 100 is separated by a buffer 210 , the battery cells 100 and the buffer 210 are cross-arranged along a first direction, and a buffer 210 is provided between any two adjacent battery cells 100 .

[0050] Therefore, a buffer 210 is provided between two adjacent battery cells 100. During the use of the battery pack, each battery cell 100 can achieve a shock absorption effect by squeezing the buffer 210, reducing the collision between the battery cells 100, improving the reliability of the battery pack, and extending the service life of the battery pack. In addition, arranging a buffer 210 between any two adjacent battery cells 100 can increase the deformation capacity of the battery cell group 10 in the first direction by increasing the number of buffers 210, while avoiding a reduction in the energy density of the battery due to an excessive number of buffers 210.

[0051] See also Figure 2 According to some embodiments of the present application, a buffer member 210 is provided on at least one outer end surface of the battery cell group 10 along the first direction.

[0052] Optionally, a buffer member 210 is provided on one of the outer end surfaces of the battery cell group 10 along the first direction.

[0053] Optionally, buffer members 210 are provided on two outer end surfaces of the battery cell group 10 along the first direction.

[0054] Optionally, buffer members 210 are disposed on two outer end surfaces of the battery cell group 10 along the first direction and in the middle of the battery cell group 10 .

[0055] Therefore, the buffer member 210 separates the battery cell group 10 from other structures inside the battery box 400 , thereby reducing the probability of collision between the battery cell group 10 and other structures and improving the shock absorption effect of the battery.

[0056] See also Figures 2 to 3 According to some embodiments of the present application, the buffer 210 has a first area 211 and a second area 212 , the thickness of the first area 211 is greater than the thickness of the second area 212 , and the first area 211 is used to fit the battery cell 100 and is elastically deformed by being squeezed by the battery cell 100 .

[0057] Therefore, by providing the second region 212 with a relatively thin thickness, the structural strength of the buffer 210 is reduced, so that the buffer 210 is more easily driven to deform, and the probability of the battery cell 100 being squeezed and deformed during the process of driving the buffer 210 to deform is reduced.

[0058] See also Figure 2 Optionally, the orthographic projection of the first area 211 in the first direction surrounds the second area 212 .

[0059] Therefore, the second region 212 can partially accommodate the expansion and protrusion of the battery cell 100 along the first direction, reduce the influence of the expansion of the battery cell 100 on the fixing effect of the battery cell 100, and improve the reliability of the battery.

[0060] Optionally, a plurality of second regions 212 are provided, and the plurality of second regions 212 are arranged in an array with the geometric center of the first region 211 as the center.

[0061] Exemplarily, the second regions 212 are arranged in a ring array with the geometric center of the first region 211 as the center.

[0062] Thus, the force uniformity of the first area 211 arranged around the second area 212 is improved, and the difference in elastic deformation of different parts of the first area 211 is reduced.

[0063] Optionally, the second region 212 is a through-hole structure penetrating the buffer 210 along the first direction, and the shape of the through-hole structure may be a circle, a regular polygon or other geometric shapes that can fit the battery cell 100 .

[0064] Therefore, the second area 212 can be quickly formed by drilling or the like, which reduces the difficulty of processing the buffer 210 and helps control the cost of the buffer 210; the second area 212 arranged in a through-hole structure can also avoid heat accumulation between the battery cell 100 and the buffer 210, which helps dissipate heat during the use of the battery cell 100.

[0065] According to some embodiments of the present application, the first region 211 is made of foamed material or aerogel.

[0066] Therefore, the first region 211 has sufficient elastic deformation ability, which helps the battery cell group 10 to be smoothly assembled into the battery box 400 and helps the battery cell group 10 to expand inside the battery box 400 to strengthen the fixing effect of the battery cell 100 inside the battery box 400 .

[0067] It should be understood that the material used to make the first region 211 has flame retardancy to improve the fire safety performance of the battery.

[0068] According to some embodiments of the present application, the spacer set further includes at least one heat dissipation element 220 .

[0069] As a result, the heat dissipation performance between the battery cell 100 and the buffer member 210 is enhanced, a large amount of heat is prevented from accumulating in the battery cell group 10 when the battery is in use, and the safety of the CTP roll-pressed steel battery pack is improved.

[0070] See also Figure 4 Optionally, at least a portion of the heat sink 220 is accommodated in the second area 212 .

[0071] As a result, the heat sink 220 partially overlaps with the second region 212 in the first direction, shortening the length of the spacer group in the first direction, which helps to improve the energy density of the CTP roll-pressed steel battery pack.

[0072] Optionally, the second region 212 is a hollow structure, and the heat sink 220 is embedded in the second region 212 .

[0073] Optionally, the heat sink 220 has a base portion and a reinforcement portion protruding toward the buffer 210 , the base portion is attached to the first area 211 and the reinforcement portion extends into the second area 212 .

[0074] Therefore, the fixing effect between the heat sink 220 and the buffer 210 is enhanced, and the stability of the spacer assembly is improved.

[0075] See also Figure 5 According to certain embodiments of the present application, the battery box 400 is provided with a limiting structure 300, and the limiting structure 300 is arranged at both ends of at least one battery cell group 10 along the first direction.

[0076] The limiting structure 300 is fixedly connected to the battery box 400, and the limiting structure 300 at both ends of the battery cell group 10 and the battery box 400 jointly define a receiving cavity, the initial thickness of the spacer group and the thickness of the battery cell group 10 are greater than or equal to the length of the receiving cavity in the first direction, and the sum of the extruded thickness of the spacer group and the thickness of the battery cell group 10 is less than the length of the receiving cavity in the first direction.

[0077] Optionally, the limiting structure 300 and the battery box 400 are integrally formed.

[0078] Optionally, the limiting structure 300 is fixedly connected to the battery box 400 .

[0079] Thus, the battery cell group 10 and the spacer group are fixed in the battery box 400 by the limiting structure 300 .

[0080] See also Figure 6 According to certain embodiments of the present application, the limiting structure 300 includes a support portion 310 for fitting the battery cell group, the support portion 310 extends in a direction away from the battery cell group 10 to form a connecting portion 320, and the support portion 310 is connected to the battery box through the connecting portion 320.

[0081] Optionally, the connection portion 320 is connected to the battery box 400 by welding.

[0082] Optionally, the connecting portion 320 is detachably connected to the battery box 400 via screws or other forms of connecting members.

[0083] Optionally, the supporting portion 310 and the connecting portion 320 form an angle of 90°.

[0084] Optionally, a reinforcing rib is provided between the supporting portion 310 and the connecting portion 320 to increase the stability of the limiting structure 300 .

[0085] Therefore, when the battery cell 100 expands and causes the battery cell group 10 to squeeze the support part 310, the connecting part 320 can prevent the support part 310 from tilting away from the battery cell group 10, thereby strengthening the fixing effect of the support part 310 on the battery cell group 10; the connecting part 320 can increase the contact area between the limiting structure 300 and the battery box 400, thereby improving the stability of the limiting structure 300 and strengthening the fixing effect on the battery cell group 10.

[0086] See also Figure 6 According to certain embodiments of the present application, the support portion 310 has a first wall 311 and a second wall 312, the first wall 311 is used to fit the battery cell group 10, and the second wall 312 is used to form a connecting portion 320, the first wall 311 and the second wall 312 are spaced apart along a first direction, and a reinforcing rib 313 is provided between the first wall 311 and the second wall 312, and the reinforcing rib 313 separates the first wall 311 and the second wall 312 to form a plurality of energy absorption cavities 314.

[0087] Thus, the energy absorption cavity 314 can reduce the rigidity of the support portion 310. When the battery cell group 10 presses the support portion 310, the first wall 311 deforms to fit the battery cell group 10, thereby improving the supporting effect of the first wall 311 on the battery cell group 10. The multiple energy absorption cavities 314 separated by the reinforcing ribs 313 can accommodate the expansion and deformation of different areas of the battery cell group 10, thereby improving the fit between the battery cell group 10 and the first wall 311, and enhancing the fixing effect of the limiting structure 300 on the battery cell group 10.

[0088] Optionally, the reinforcing ribs 313 extend along the first direction to enhance the supporting effect of the supporting portion 310 on the battery cell group 10 in the first direction.

[0089] See also Figure 7 According to some embodiments of the present application, the support portion 310 is provided with a clearance groove 330 , which penetrates the support portion 310 along the first direction, and the clearance groove 330 opens in a direction away from the connecting portion 320 .

[0090] During the process of assembling the cell group 10 to the battery box 400, the tooling abuts against both ends of the cell group 10 and applies pressure to the cell group 10, driving the buffer 210 to deform, thereby achieving a change in the length of the cell group 10 in the first direction. After the cell group 10 is assembled to the battery box 400, the tooling is released, the buffer 210 is elastically reset, and the ends of the cell group 10 are fully in contact with the limiting structure 300 to fix the cell group 10.

[0091] Thus, the tooling can enter when the battery cell group 10 is assembled into the battery box 400 , and can be withdrawn after the battery cell group 10 is assembled.

[0092] According to certain embodiments of the present application, the limiting structure 300 is a steel part, and the limiting structure 300 is a roll-formed part.

[0093] Therefore, the production efficiency of the limiting structure 300 is improved, and at the same time, the structural strength of the limiting structure 300 is improved, and the fixing effect of the limiting structure 300 on the battery cell group 10 is strengthened.

[0094] According to certain embodiments of the present application, the spacer assembly further includes an insulating member 230, and the insulating member 230 is used to fit the limiting structure 300, and the orthographic projection of the insulating member 230 in the first direction covers the battery cell 100. Figure 3 The insulating member 230 is stacked on the battery cell group 10 along the first direction. It is easy to understand that the tooling abuts against the insulating member 230 to achieve the clamping movement of the battery cell group 10.

[0095] Optionally, the insulating member 230 is arranged between the battery cell 100 at the end of the battery cell group 10 and the limiting structure 300 .

[0096] Optionally, a buffer member 210 is arranged between the battery cell 100 at the end of the battery cell group 10 and the limiting structure 300 , and the insulating member 230 is arranged between the buffer member 210 and the limiting structure 300 .

[0097] As a result, the safety of the CTP roll-pressed steel battery pack is improved, and the load uniformity of the tooling when clamping the mobile battery cell group 10 is improved.

[0098] According to certain embodiments of the present application, multiple groups of battery cell groups 10 are provided along the second direction (e.g., the Y direction in the figure), the number of spacer groups is equal to that of battery cell groups 10 and they are arranged one-to-one, and a flame retardant is provided between two adjacent groups of battery cell groups 10 along the second direction.

[0099] Optionally, the flame retardant component is made of at least one of mica and aerogel.

[0100] Thereby, the energy density of the CTP roll-rolled steel battery pack is improved, and the fire safety performance of the CTP roll-rolled steel battery pack is enhanced.

[0101] According to some embodiments of the present application, along a third direction (eg, the Z direction in the figure), an end of the flame retardant is arranged no higher than an output terminal of the battery cell 100 .

[0102] Optionally, the end of the flame retardant is arranged flush with the end cover of the battery cell 100 .

[0103] Thus, the flame retardant is prevented from protruding and lifting the busbar, thereby avoiding affecting the electrical connection between the busbar and the battery cell 100 .

[0104] According to some embodiments of the present application, the battery box 400 is bonded and fixed to the battery cell group 10 .

[0105] The battery box 400 includes a bottom plate 410 and two second plates 430 and two first plates 420 extending in the same direction from the edges of the bottom plate 410 . The two sides of each second plate 430 are respectively connected to the two first plates 420 , and the two sides of each first plate 420 are respectively connected to the two second plates 430 .

[0106] Optionally, the battery box 400 includes a first adhesive layer, which is sandwiched between the battery cell group 10 and the bottom plate 410, and the first adhesive layer is located between the support portions 310 of the two limiting structures 300, and the orthographic projection of the battery cell group 10 on the bottom plate 410 is located in the first adhesive layer.

[0107] Optionally, the battery box 400 includes a second adhesive layer, which is sandwiched between the battery cell group 10 and the first plate 420 , and the orthographic projection of the battery cell group 10 on the first plate 420 is located in the second adhesive layer.

[0108] Thus, the connection between the battery cell group 10 and the battery box 400 is achieved, the movement of the battery cell group 10 inside the battery box 400 is reduced, and the service life of the CTP roll-pressed steel battery pack is extended.

[0109] Optionally, the thickness of the first adhesive layer is greater than the distance between the battery cell group 10 and the bottom plate 410 .

[0110] As a result, the first adhesive layer is squeezed and fully contacts the battery cell group 10 and the bottom plate 410 , thereby enhancing the fixing effect between the battery cell group 10 and the bottom plate 410 .

[0111] Optionally, the thickness of the second adhesive layer is greater than the distance between the battery cell group 10 and the first plate 420 .

[0112] As a result, the second adhesive layer is squeezed and fully contacts the battery cell group 10 and the first plate 420 , thereby enhancing the fixing effect between the battery cell group 10 and the first plate 420 .

[0113] See also Figure 7 According to certain embodiments of the present application, a first flange edge 421 is formed on a side of the first plate 420 away from the bottom plate 410, and the first flange edge 421 is used to connect to the box cover. A second flange edge 431 is formed on the second plate 430, and the second flange edge 431 is used to connect to the box cover. The first flange edge 421 is connected to the second flange edge 431.

[0114] Optionally, the junction between the first folded edge 421 and the second folded edge 431 is welded and sealed.

[0115] This improves the airtightness of the battery box 400 .

[0116] In the second aspect, the embodiment of the present application also provides an electric device, which includes the CTP roll-pressed steel battery pack provided by any of the above embodiments, so the electric device has all the beneficial effects of the above CTP roll-pressed steel battery pack. The CTP roll-pressed steel battery pack can be used as a power source for the electric device, and can also be used as an energy storage unit for the electric device.

[0117] Electrical devices may include but are not limited to mobile devices (such as mobile phones, laptops, etc.), electric vehicles (such as pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf carts, electric trucks, etc.), electric trains, ships and satellites, energy storage systems, etc.

[0118] In addition, the term "and / or" in this article is only a description of the association relationship between the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0119] It should be understood that in the embodiment of the present application, "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B according to A does not mean determining B only according to A, and B can also be determined according to A and / or other information.

[0120] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A CTP roll-pressed steel battery pack, characterized in that: include: A battery cell group, the battery cell group comprising a plurality of battery cells arranged along a first direction; A spacer group, the spacer group comprising at least one buffer arranged along the first direction, the buffer being sandwiched between at least part of the adjacent battery cells, and the buffer being elastically deformable and repositionable in the first direction; A battery box, wherein one battery cell group is arranged in the battery box or a plurality of battery cell groups are distributed in the battery box in an array, the battery box is a steel part, and the battery box is a roll-formed part.

2. The CTP roll-pressed steel battery pack according to claim 1, characterized in that: The plurality of battery cells are distributed at equal intervals along the first direction through the buffer; and / or, The buffer is provided on at least one outer end surface of the battery cell group along the first direction, or the buffer is provided on both the outer end surface of the battery cell group and the middle part of the battery cell group.

3. The CTP roll-pressed steel battery pack according to claim 1 or 2, characterized in that: The buffer has a first region and a second region. The thickness of the first region is greater than the thickness of the second region. The orthographic projection of the first region in a first direction surrounds the second region.

4. The CTP roll-pressed steel battery pack according to claim 3, characterized in that: The spacer group further includes at least one heat sink, at least a portion of which is accommodated in the second region.

5. The CTP roll-pressed steel battery pack according to claim 1, characterized in that: The battery box is provided with a limiting structure, and the limiting structure is arranged at two ends of at least one of the battery cell groups along a first direction.

6. The CTP roll-pressed steel battery pack according to claim 5, characterized in that: The limiting structure includes a supporting portion for fitting the battery cell group, the supporting portion extends in a direction away from the battery cell group to form a connecting portion, and the supporting portion is connected to the battery box through the connecting portion.

7. The CTP roll-pressed steel battery pack according to claim 6, characterized in that: The support portion has a first wall for fitting the battery cell group and a second wall formed with the connecting portion. A reinforcing rib is provided between the first wall and the second wall. The reinforcing rib separates the first wall and the second wall to form a plurality of energy absorbing cavities.

8. The CTP roll-pressed steel battery pack according to claim 5, characterized in that: The limiting structure is a steel part, and the limiting structure is a roll-formed part.

9. The CTP roll-pressed steel battery pack according to claim 1, characterized in that: A plurality of battery cell groups are provided along the second direction, the number of the spacer groups is equal to that of the battery cell groups and they are arranged in one-to-one correspondence, and a flame retardant is provided between two adjacent battery cell groups along the second direction.

10. An electrical device, characterized in that: Comprising a CTP roll-pressed steel battery pack as described in any one of claims 1 to 9.

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