Battery assembly, battery pack and power utilization system

Abstract

The invention provides a battery assembly, a battery pack and a power utilization system, the battery assembly comprises a plurality of battery cells stacked in the vertical direction, the surface of any battery cell between two adjacent battery cells is a first surface, and the first surface is provided with a supporting piece and a bonding piece; the supporting piece, the bonding piece and the first surface are matched to form an avoiding area in a surrounding mode, and the ratio of the area of the avoiding area to the area of the first surface ranges from 3: 20 to 18: 25. According to the battery assembly, the supporting piece and the bonding piece are arranged between the two adjacent battery cells and matched with the first surface to define the avoiding area, so that the two stacked battery cells are prevented from being separated, and meanwhile, a gap is formed between the opposite surfaces of the two adjacent battery cells to provide a reserved expansion space. And the ratio of the area of the avoiding area to the area of the surface of any battery cell is set to be 3: 20-18: 25, so that the reliability of the reserved expansion space is ensured, the expansion space can be used for coping with expansion of the battery cells after multiple charging and discharging cycles, the performance of the battery assembly is improved, and the service life of the battery assembly is prolonged.

Description

Technical Field

[0001] The present application relates to the field of power battery technology, and in particular to a battery assembly, a battery pack and a power system. Background Art

[0002] The battery assembly can be made up of multiple cells stacked vertically, and multiple cells are connected in series or in parallel to provide all or the main power source for the vehicle. As a key component of electric vehicles, the performance and service life of the battery assembly are crucial.

[0003] In the prior art, stacked cells are usually tied and fixed directly with cable ties around the periphery of multiple cells to ensure the stability of the battery assembly. However, once the battery assembly has been charged and discharged for a long time, each cell will expand to a certain extent. The cumulative expansion force of multiple cells is very large, and the cable tie may break, which may cause the cells to separate, affecting the performance and service life of the battery assembly; or the cells may squeeze each other, resulting in lithium deposition, which will also have a harmful effect on the performance and service life of the battery assembly. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present application is to provide a battery assembly and a vehicle to provide a certain reserved expansion space to improve the performance and service life of the battery assembly.

[0005] In a first aspect, the present application provides a battery assembly, comprising a plurality of battery cells stacked in a vertical direction, wherein a surface of one of the battery cells between two adjacent battery cells is a first surface, and a support member and an adhesive member are provided on the first surface; an avoidance area is provided on the first surface, and the geometric center of the first surface is located in the avoidance area, and edges of the support member and the adhesive member close to the geometric center of the first surface coincide with a portion of the edges of the avoidance area;

[0006] The extension lines of the edges of each support member and each adhesive member close to the geometric center of the first surface have a first intersection point that intersects each other, and / or the extension lines of the edges of each support member and each adhesive member close to the geometric center of the first surface and the edge of the first surface have a second intersection point that intersects each other;

[0007] If all the intersections are second intersections, the avoidance zone is an area formed by connecting and enclosing multiple second intersections;

[0008] If the intersections include a plurality of first intersections and a plurality of second intersections, and the first intersections are connected in sequence to form a closed figure on the first surface, the avoidance zone is an area formed by connecting and enclosing a plurality of first intersections;

[0009] If the intersections include a plurality of first intersections and a plurality of second intersections, and the first intersections cannot be connected in sequence to form a closed figure on the first surface, the avoidance zone is an area formed by connecting all the first intersections and the plurality of second intersections in sequence;

[0010] The ratio of the area of ​​the avoidance zone to the area of ​​the first surface is between 3:20 and 18:25.

[0011] The battery assembly of the present application is used to provide electrical energy by arranging a plurality of battery cells stacked in a vertical direction. At the same time, a support member is arranged between two adjacent battery cells to support the two adjacent battery cells. The battery assembly of the present application also arranges an adhesive member between two adjacent battery cells to limit the relative displacement between the two adjacent battery cells and avoid separation between the adjacent battery cells.

[0012] It can be understood that the battery assembly of the present application forms an escape zone by arranging a support member and an adhesive member on the first surface and cooperating with the first surface to enclose and form an escape zone to ensure that two adjacent battery cells are relatively fixed and avoid separation between two adjacent stacked battery cells. At the same time, a gap is formed on the opposite surfaces of two adjacent battery cells to provide a certain reserved expansion space to avoid mutual squeezing between two adjacent battery cells due to excessive expansion force. At the same time, the ratio of the area of ​​the escape zone to the area of ​​one of the battery cell surfaces is set between 3:20 and 18:25 to ensure the reliability of the reserved expansion space, so that it can be used to cope with the expansion of the battery cell after multiple charge and discharge cycles, thereby improving the performance and service life of the battery assembly.

[0013] In one embodiment, the ratio of the area of ​​the avoidance zone to the area of ​​the first surface is between 1:5 and 11:20.

[0014] In one embodiment, each battery cell includes a first side wall located on the same side of the battery assembly, the first side wall is perpendicular to the first surface, the battery cell includes a pole, the pole is arranged on the first side wall, and the support member includes a first support member, and the first support member is arranged close to the first side wall.

[0015] In this embodiment, a pole is provided on the first side wall of the battery cell perpendicular to the first surface as a power lead-out terminal. At the same time, since the weight of the side of the battery cell where the pole is provided is relatively large, a first support is provided near the first side wall to ensure that the reserved expansion space is relatively reliable.

[0016] In one embodiment, there are two poles, which are spaced apart along the length direction of the battery assembly; there is one support member, and the distances from both ends of the first support member along the length direction of the battery assembly to the two poles are equal.

[0017] In this embodiment, based on the vertical direction, the poles on the same side between two adjacent battery cells, that is, the poles of the same polarity are connected by a connecting piece, and the two poles of the battery cell are arranged at opposite ends of the first side wall along the length direction of the battery assembly. By setting the first support member so that the distances from both ends of the battery assembly along the length direction of the battery assembly are equal to the distances between the two poles, that is, the support member is set in the middle position of the battery cell along the length direction of the battery assembly, it is prevented that the battery cell is locally squeezed and the connecting piece is twisted.

[0018] In one embodiment, there are two adhesives, and the two adhesives are arranged at intervals along the length direction of the battery assembly. An angle is formed between the extension line of the edge of each adhesive close to the geometric center of the first surface and the extension line of the edge of the first support close to the geometric center of the first surface, and the angle ranges from 60° to 100°.

[0019] In this embodiment, two adhesives are spaced apart along the length direction of the battery assembly, and the angle between the extension line of the edge of the adhesive close to the geometric center of the first surface and the extension line of the edge of the first support close to the geometric center of the first surface is set between 60° and 100° to ensure that the adhesive can reliably bond the relative surfaces between two adjacent battery cells, thereby ensuring the overall bonding reliability between the two adjacent battery cells.

[0020] In one embodiment, along the width direction of the battery assembly, the first support member is arranged on one side of the avoidance zone close to the first side wall, and along the length direction of the battery assembly, the adhesive members are respectively arranged on two opposite sides of the avoidance zone along the length direction of the battery assembly, and the two adhesive members are respectively in contact with the first support member.

[0021] In this embodiment, the first support member is arranged on the side of the avoidance zone close to the first side wall along the width direction of the battery assembly, and adhesive members are respectively arranged on the opposite sides of the avoidance zone along the length direction of the battery assembly, and the two adhesive members are respectively in contact with the first support member to increase the reliability of the reserved expansion space provided by the avoidance zone.

[0022] In one embodiment, projections of the first supporting member and the adhesive member on the first surface are both rectangular, and the first supporting member and the adhesive member are perpendicular to each other.

[0023] In this embodiment, by setting the projections of the first support member and the adhesive member on the first surface to be rectangular and setting the first support member and the adhesive member to be perpendicular to each other, the shape of the avoidance zone is relatively regular, thereby optimizing the layout of the support member and the adhesive member and improving the reliability of the avoidance zone.

[0024] In one embodiment, along the width direction of the battery assembly, the battery assembly has a second side wall opposite to the first side wall, and the second side wall is connected to the first surface and is vertically arranged;

[0025] The extension line of the edge of the support member close to the geometric center of the first surface intersects with the extension lines of the edges of the two adhesive members close to the geometric center of the first surface to form two first intersection points, the extension lines of the edges of the two adhesive members close to the geometric center of the first surface intersect with the edge connected to the second side wall to form two second intersection points, and the avoidance area is the area formed on the first surface by connecting the two first intersection points and the two second intersection points.

[0026] In one embodiment, the ratio of the sum of the projection areas of the support members on the surface of the battery cell to the area of ​​the surface of the battery cell is between 0.1% and 10%.

[0027] In this embodiment, the ratio of the sum of the projected areas of the support members on the cell surface to the cell surface area is set between 0.1% and 10% to ensure the support effect of the support members and the reliability of the reserved expansion space.

[0028] In one embodiment, the ratio of the sum of the projected areas of the adhesive on the surface of the battery cell to the area of ​​the surface of the battery cell is between 20% and 70%.

[0029] In this embodiment, the ratio of the sum of the projected areas of the adhesive on the cell surface to the cell surface area is set between 20% and 70% to ensure the bonding effect of the adhesive and the reliability of the reserved expansion space.

[0030] In one embodiment, the ratio of the sum of the projection areas of the support members on the cell surface to the cell surface area is between 0.1% and 10%; the ratio of the sum of the projection areas of the adhesive members on the cell surface to the cell surface area is between 20% and 70%.

[0031] In this embodiment, by setting the ratio of the sum of the projected areas of the support members on the cell surface to the area of ​​the cell surface to be between 0.1% and 10%, and setting the ratio of the sum of the projected areas of the adhesive members on the cell surface to the area of ​​the cell surface to be between 20% and 70%, on the one hand, the sum of the projected areas of the adhesive members on the cell surface is greater than the sum of the projected areas of the support members on the cell surface, thereby ensuring that the bonding force of the adhesive members on the cell is greater than the supporting force of the support members on the cell, so as to ensure the stability of the stacking between two adjacent cells and avoid separation between two adjacent cells. On the other hand, it is avoided that the area occupied by the adhesive members on the cell surface is too large, resulting in too small a reserved expansion space, which affects the heat dissipation effect and increases the cost.

[0032] In one embodiment, along the vertical direction, the height of the support member is greater than or equal to the height of the adhesive member.

[0033] In this embodiment, the height of the support member is set to be slightly greater than or equal to the height of the adhesive member to ensure that a sufficiently large expansion space is provided in the early stage of the battery cell's life cycle to prevent the battery cell from being squeezed in the early stage of its life cycle, thereby affecting the battery cell's service life.

[0034] In one embodiment, the number of the support member is one, and along the length direction of the battery assembly, the ratio of the length of the support member to the length of the first side wall is between 2:5 and 7:10.

[0035] In this embodiment, the ratio of the length of the support member to the length of the first side wall is set between 2:5 and 7:10 along the length direction of the battery assembly to ensure the supporting effect of the support member and reduce the cost.

[0036] In one embodiment, the ratio of the distance from the geometric center of the support member to the first side wall to the distance to the geometric center of the surface of the battery cell is between 0 and 4:5.

[0037] In this embodiment, the ratio of the distance from the geometric center of the support member to the first side wall to the distance to the geometric center of the battery cell surface is set between 0 and 4:5 to ensure that the support member is relatively far away from the geometric center of the battery cell surface, thereby ensuring that sufficient reserved expansion space is provided in the central area of ​​the battery cell surface.

[0038] In one embodiment, along the length direction of the first side wall, the ratio of the distance from the geometric center of the adhesive to the relatively close side wall to the distance to the geometric center of the battery cell surface is between 0 and 17:20.

[0039] In this embodiment, the ratio of the distance from the geometric center of the adhesive to the relatively close side wall to the distance to the geometric center of the battery cell surface is set between 0 and 17:20 to ensure that the relative position of the adhesive is away from the geometric center of the battery cell surface, thereby ensuring that sufficient reserved expansion space is provided in the central area of ​​the battery cell surface.

[0040] In one embodiment, the battery assembly further includes a filling glue, which is disposed between two adjacent battery cells. The battery cell includes a second side wall disposed opposite to the first side wall, and the filling glue is disposed close to the second side wall.

[0041] In this embodiment, a filling glue is arranged between two adjacent battery cells and is arranged close to the second side wall opposite to the first side wall, so that the filling glue and the support member cooperate to support the two adjacent stacked battery cells, thereby enhancing the stability of the support. At the same time, since the filling glue has a certain viscosity, the filling glue can also assist the adhesive member in limiting the relative displacement between the two adjacent battery cells.

[0042] In one embodiment, the ratio of the area enclosed by the support member, the adhesive member, and the filling glue on the surface of the battery cell to the area of ​​the surface of the battery cell is between 1:5 and 11:20.

[0043] In this embodiment, based on the fact that the support member, adhesive member and filling glue are all in the shape of long strips, the ratio of the area formed by the support member, adhesive member and filling glue on the surface of the battery cell to the area of ​​the surface of the battery cell is set between 1:5 and 11:20, so as to provide sufficient reserved expansion space while further improving the adhesion between adjacent battery cells.

[0044] In a second aspect, the present application provides a battery pack comprising a battery assembly as in any of the above embodiments.

[0045] In a third aspect, the present application provides an electricity consumption system, including a battery assembly as in any of the above embodiments or a battery pack as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0047] Figure 1 A schematic diagram of the structure of a vehicle provided in one embodiment of the present application;

[0048] Figure 2 A schematic diagram of a planar structure of one side of a battery assembly provided in one embodiment of the present application;

[0049] Figure 3 A schematic diagram of the planar structure of the other side of a battery assembly provided in one embodiment of the present application;

[0050] Figure 4 A schematic diagram of a planar structure of one side of a battery assembly provided in another embodiment of the present application;

[0051] Figure 5 A schematic diagram of a planar structure of one side of a battery assembly provided in another embodiment of the present application;

[0052] Figure 6 A schematic diagram of a planar structure of one side of a battery assembly provided in another embodiment of the present application;

[0053] Figure 7 A schematic diagram of a planar structure of one side of a battery assembly provided in another embodiment of the present application;

[0054] Figure 8 A schematic diagram of a planar structure of one side of a battery assembly provided in another embodiment of the present application;

[0055] Fig. 9 This is a schematic diagram of the planar structure of one side of a battery assembly provided in another embodiment of the present application.

[0056] Figure numbers: 200-vehicle; 201-body; 100-battery assembly; 10-battery cell; 11-first surface; 111-avoidance area; 12-side wall; 12a-first side wall; 12b-second side wall; 12c-third side wall; 12d-fourth side wall; 13-pole; 14-explosion-proof valve; 15-first intersection; 16-second intersection; 20-support member; 20a-first support member; 30-adhesive member; 40-filling glue; 001-first direction; 002-second direction; 003-third direction. DETAILED DESCRIPTION

[0057] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly and comprehensively understood.

[0058] The following descriptions of the embodiments are with reference to the attached diagrams to illustrate specific embodiments that the present application can be used to implement. The serial numbers for the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present application, unless otherwise specified, include direct and indirect connections (couplings). The directional terms mentioned in the present application, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0059] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be fixedly connected, detachably connected, or integrally connected; it can be mechanically connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances. It should be noted that the terms "first", "second", etc. in the specification, claims, and drawings of this application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "include", "may include", "include", or "may include" used in this application indicate the existence of the corresponding functions, operations, elements, etc. disclosed, and do not limit one or more other functions, operations, elements, etc. In addition, the terms "include" or "include" indicate the existence of the corresponding features, numbers, steps, operations, elements, components, or combinations thereof disclosed in the specification, and do not exclude the existence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, and are intended to cover non-exclusive inclusions.

[0060] See also Figure 2 FIG. 1 is a schematic diagram of a planar structure of one side of a battery assembly 100 provided in an embodiment of the present application, and is used in conjunction with FIG. Figure 3 The diagram shows a planar structural diagram of the other side of a battery assembly 100 provided in one embodiment of the present application.

[0061] like Figure 2 and Figure 3 As shown, the battery assembly 100 of the present application includes a battery cell 10, a support member 20 and an adhesive member 30. In one embodiment of the present application, the battery cell 10 is a square battery cell, that is, the shape of the battery cell 10 is a six-sided cube. The battery cell 10 includes an upper surface and a lower surface arranged relatively along a first direction 001. Among them, the first direction 001 is a vertical direction. The number of battery cells 10 is two, and two battery cells 10 are stacked along the first direction 001. Among them, in order to ensure the stability of the stacked battery cells 10, the battery assembly 100 is stacked through the surface with a larger area in the battery cell 10. Specifically, the upper surface and the lower surface of the battery cell 10 have a significantly larger area than the other side surfaces. For the convenience of description, the upper surface and the lower surface of the battery cell 10 are defined as the large surface of the battery cell 10, and the large surface of any one of the battery cells 10 is the first surface 11.

[0062] In one embodiment disclosed in the present application, the battery cell 10 further includes a pole 13 and an explosion-proof valve 14, and the pole 13 and the explosion-proof valve 14 are both arranged on one of the side walls 12 of the battery cell 10. Specifically, the explosion-proof valve 14 is arranged in the middle of the side wall 12 along the length direction of the battery assembly 100, that is, in the middle of the first side wall 12a. There are two poles 13, and the two poles 13 are arranged on opposite sides of the explosion-proof valve 14 along the length direction of the battery assembly 100. And the distances from the two poles 13 to the explosion-proof valve 14 are equal. Among them, the first side wall 12a is perpendicular to the first surface 11 of the battery cell 10. The pole 13 can be used as a power lead-out terminal to lead out the electrical energy stored in the battery cell 10. The explosion-proof valve 14 can be used to relieve pressure and exhaust gas to prevent the battery cell 10 from being flatulent and causing explosion. In another embodiment disclosed in the present application, the pole 13 and the explosion-proof valve 14 are respectively arranged on different side walls 12 of the battery cell 10, and the side wall 12 is connected to the upper surface and the lower surface. The side wall 12 where the pole 13 is arranged is the first side wall 12a.

[0063] In addition, in the embodiments disclosed in the present application, the surfaces opposite to each other of two adjacent battery cells 10 in the stacking direction are the first surface 11, and the support member 20 and the adhesive member 30 are arranged on the first surface 11. And the battery assembly 100 of the present application also includes an avoidance area 111 formed on the first surface 11, and the geometric center of the first surface 11 is located in the avoidance area 111. The edges of the support member 20 and the adhesive member 30 close to the geometric center of the first surface 11 coincide with the partial edges of the avoidance area 111. That is, the avoidance area 111 is defined by the support member 20 and the adhesive member 30. Or it can be understood that the avoidance area 111 is formed by the support member 20, the adhesive member 30 and the first surface 11. In other words, the avoidance zone 111 of the present application is an area enclosed on the first surface 11 by the intersection of the extended lines of the edges of each support member 20 and each adhesive member 30 near the geometric center of the first surface 11 and / or the intersection of the extended lines of the edges of each support member 20 and each adhesive member 30 near the geometric center of the first surface 11 and the edges of the first surface 11.

[0064] That is, if the extension line of the edge of the support member 20 or the adhesive member 30 close to the geometric center of the first surface 11 intersects with other support members 20 or adhesive members 30 and can form a closed figure on the first surface 11, then the avoidance area 111 is an area formed by the extension lines of the edges of the geometric center of the multiple support members 20 or adhesive members 30 intersecting with each other and then enclosing on the first surface 11. If the extension line of the edge of the support member 20 or adhesive member 30 close to the geometric center of the first surface 11 intersects with other support members 20 or adhesive members 30 but cannot form a closed figure on the first surface 11, then the avoidance area 111 is an area formed by the extension lines of the edges of the geometric center of the multiple support members 20 or adhesive members 30 and the edges of the first surface 11 intersecting with each other and then enclosing on the first surface 11. If the extension line of the edge of the support member 20 or the adhesive member 30 close to the geometric center of the first surface 11 does not intersect with other support members 20 or adhesive members 30, then the avoidance zone 111 is an area enclosed on the first surface 11 where the extension line of the edge of the support member 20 and the adhesive member 30 close to the geometric center of the first surface 11 intersects with the edge of the first surface 11. The ratio of the area of ​​the avoidance zone 111 to the area of ​​the first surface 11 is between 3:20 and 18:25. It should be noted that this area needs to exclude the area occupied by the support member 20 and the adhesive member 30 themselves on the first surface 11. For ease of understanding, the present application provides the following embodiments to illustrate the avoidance zone 111.

[0065] exist Figure 3 In the illustrated embodiment, the projections of the support members 20 and the adhesive members 30 on the first surface 11 are both rectangular. There are three support members 20 and two adhesive members 30. The two adhesive members 30 are spaced apart along the second direction 002 on opposite sides of the geometric center of the first surface 11. Each support member 20 is disposed close to the first side wall 12a. The extension lines of the edges of a relatively close support member 20 and an adhesive member 30 close to the geometric center of the first surface 11 intersect with each other to form a first intersection 15, and the extension lines of the edges of the two adhesive members 30 close to the geometric center of the first surface 11 intersect with the edges of the first surface 11 to form a second intersection 16. The three support members 20 are interconnected and sequentially connected to the first intersection 15 and the second intersection 16 in a clockwise direction or a counterclockwise direction to enclose and form an avoidance area 111. That is, the avoidance area 111 at this time is Figure 3 The dotted line portion and the area formed by the edges of the support member 20 , the adhesive member 30 , and the first surface 11 .

[0066] like Figure 4As shown, in one embodiment, the projections of the support member 20 and the adhesive member 30 on the first surface 11 are both rectangular. The number of the support member 20 and the adhesive member 30 is one each. The support member 20 is relatively close to the first side wall 12a, and the support member 20 and the adhesive member 30 both extend along the second direction 002. The extension line of the edge of the support member 20 close to the geometric center of the first surface 11 intersects with the edge of the first surface 11 to form a second intersection 16, and the extension line of the edge of the adhesive member 30 close to the geometric center of the first surface 11 also intersects with the edge of the first surface 11 to form a second intersection 16. Each second intersection 16 is connected in sequence to form an avoidance area 111. That is, at this time, the avoidance area 111 is Figure 4 The dotted line portion and the area formed by the edges of the support member 20 , the adhesive member 30 , and the first surface 11 .

[0067] like Figure 5 As shown, in one embodiment, the projections of the support member 20 and the adhesive member 30 on the first surface 11 are both rectangular. The number of the support member 20 and the adhesive member 30 is one each, and the support member 20 is relatively close to the first side wall 12a. The support member 20 extends along the second direction 002, and the adhesive member 30 extends along the third direction 003. The extension line of the edge of the support member 20 close to the geometric center of the first surface 11 intersects with the edge of the first surface 11 to form a second intersection 16, and the extension line of the edge of the adhesive member 30 close to the geometric center of the first surface 11 also intersects with the edge of the first surface 11 to form a second intersection 16. At the same time, the extension lines of the edges of the support member 20 and the adhesive member 30 close to the geometric center of the first surface 11 also intersect to form a first intersection. The two second intersections 16 and the first intersection 15 are sequentially connected to form an avoidance area 111. That is, at this time, the avoidance area 111 is Figure 5 The dotted line portion and the area formed by the edges of the support member 20 , the adhesive member 30 , and the first surface 11 .

[0068] like Figure 6 As shown, in one embodiment, the projections of the support members 20 and the adhesive members 30 on the first surface 11 are irregular shapes. There are three support members 20 and three adhesive members 30. The support members 20 are relatively close to the first side wall 12a, and the support members 20 are arranged arbitrarily. The adhesive members 30 are also arranged arbitrarily. The extension lines of the edges of a relatively close support member 20 and an adhesive member 30 close to the first surface 11 intersect with each other to form a first intersection 15, and the support members 20 are connected to each other, and the adhesive members 30 are connected to each other and are connected to the first intersection 15 in sequence in a clockwise direction or a counterclockwise direction to enclose and form an avoidance area 111. That is, at this time, the avoidance area 111 is Figure 6 The dotted line portion and the area enclosed by each supporting member 20 and each adhesive member 30 .

[0069] like Figure 8 As shown, in one embodiment, along the width direction of the battery assembly 100, that is, along the third direction 003, the battery pack 100 has a second side wall 12b opposite to the first side wall 12a, and the second side wall 12b is connected to the first surface 11 and is vertically arranged. The number of support members 20 is one, and the number of adhesive members 30 is also three. The extension line of the edge of the support member 20 close to the geometric center of the first surface 11 intersects with the extension lines of the edges of the two adhesive members 30 close to the geometric center of the first surface 11 and forms two first intersection points 15. The extension lines of the edges of the two adhesive members 30 close to the geometric center of the first surface 11 intersect with the edges connected to the second side wall 12b and form two second intersection points 16. The avoidance area 111 is an area formed on the first surface 11 by connecting the two first intersection points 15 and the two second intersection points 16. That is, at this time, the avoidance area 111 is Figure 5 The area surrounded by the middle support member 20, the adhesive member 30 and the second side wall 12b.

[0070] It should be noted that the avoidance area 111 in the above embodiment is only introduced as an example and does not represent the actual structure of the avoidance area 111. That is, the avoidance area 111 of the present application can be adaptively adjusted according to the number, shape and arrangement position of the support member 20 and the adhesive member 30, as long as the area ratio of the avoidance area 111 to the area of ​​the first surface 11 is between 3:20 and 18:25, and the present application will not elaborate on them one by one.

[0071] It can be understood that the battery assembly 100 of the present application forms an avoidance area 111 by setting a support member 20 and an adhesive member 30 on the first surface 11 and cooperating with the first surface 11 to enclose and form a relative fixation between two adjacent battery cells 10 to avoid separation between two adjacent stacked battery cells 10. At the same time, a gap is formed on the relative surfaces of two adjacent battery cells 10 to provide a certain reserved expansion space to avoid mutual squeezing between two adjacent battery cells 10 due to excessive expansion force, thereby reducing the probability of lithium precipitation of the battery cell 10. At the same time, the ratio of the area of ​​the avoidance area 111 to the area of ​​the surface of one of the battery cells 10 is set to be between 3:20 and 18:25 to ensure the reliability of the reserved expansion space, so that it can be used to cope with the expansion of the battery cell 10 after multiple charge and discharge cycles, thereby improving the performance and service life of the battery assembly 100 of the present application.

[0072] In a preferred embodiment, the ratio of the area of ​​the avoidance zone 111 to the area of ​​the first surface 11 is between 1:5 and 11:20. Since the reserved expansion space provided within this range is large enough, the supporting effect of the support member 20 is relatively good, and the bonding effect of the adhesive member 30 is relatively stable, the probability of lithium deposition in the battery cell 10 can be further reduced, and the performance and service life of the battery assembly 100 can be further improved.

[0073] In the above embodiment, the geometric center of the avoidance area 111 coincides with the geometric center of the first surface 11. It can be understood that, based on the fact that the bulging and expansion of the battery cell 10 usually occurs in the middle area of ​​the battery cell 10, the geometric center of the avoidance area 111 is set to coincide with the geometric center of the first surface 11 to ensure that the reserved expansion space provided works effectively.

[0074] In one embodiment disclosed in the present application, there are multiple support members 20, and the multiple support members 20 are located between two adjacent battery cells 10, and the support members 20 are arranged on the first surface 11 close to the first side wall 12a. At the same time, the distance between each support member 20 and the side wall 12 of the battery cell 10 is less than the distance between the support member 20 and the geometric center of the first surface 11 of the battery cell 10, that is, the position of the support member 20 is farther away from the geometric center of the first surface 11 of the battery cell 10 relative to the side wall 12. The support member 20 can provide physical space support for the stacked adjacent two battery cells 10, so that there is a certain gap between the adjacent two battery cells 10, so as to provide a certain reserved expansion space for the battery cell 10.

[0075] It should be noted that the number and position of the support members 20 are only for illustrative purposes and do not represent the actual number and position of the support members 20. That is, the number and position of the support members 20 can be adaptively adjusted according to the actual application scenario, as long as at least one support member 20 is arranged close to the first side wall 12a.

[0076] In one embodiment disclosed in the present application, there are two adhesive members 30, and the two adhesive members 30 are also located between two adjacent battery cells 10. The two adhesive members 30 are arranged on opposite sides of the geometric center of the first surface 11 of the battery cell 10 along the second direction 002, wherein the second direction 002 is parallel to the length direction of the first side wall 12a, that is, the second direction 002 is the length direction of the battery assembly 100. The adhesive member 30 also extends along the third direction 003, so that the projection of the adhesive member 30 on the first surface 11 of the battery cell 10 is rectangular. Among them, the third direction 003 is the width direction of the battery assembly 100. At the same time, the distance between the adhesive member 30 and the side wall 12 of the battery cell 10 is less than the distance between the adhesive member 30 and the geometric center of the first surface 11 of the battery cell 10, that is, the position of the adhesive member 30 is farther away from the geometric center of the battery cell 10 relative to the side wall 12 of the battery cell 10. The adhesive member 30 is used to bond the relatively close first surfaces 11 of two battery cells 10 to limit the relative displacement between the two adjacent battery cells 10 and prevent the adjacent battery cells 10 from being separated.

[0077] It should be noted that the shape, quantity and position of the adhesive 30 are only introduced as examples and do not represent the actual shape, quantity and position of the adhesive 30. That is, the shape, quantity and position of the adhesive 30 can be adaptively adjusted according to the actual application scenario, as long as the adhesive 30 can bond two adjacent battery cells 10.

[0078] In one embodiment disclosed in the present application, based on the relatively large weight of the side of the battery cell 10 where the pole 13 is provided, at least one support member 20 is provided near the first side wall 12a, that is, a first support member 20a is provided to ensure that the reserved expansion space formed in the avoidance area 111 of the first surface 11 is relatively reliable.

[0079] In an embodiment disclosed in the present application, the support member 20 can be made of polydimethylsiloxane material, so that the support member 20 has a slight elasticity and a strong rigid support capability. The adhesive member 30 can be made of polybutyl acrylate to ensure that the adhesive member 30 has a strong adhesive force.

[0080] In one embodiment, the thickness of the support member 20 along the first direction 001 is between 0.5 mm and 2 mm.

[0081] In one embodiment, the thickness of the adhesive member 30 along the first direction 001 is between 0.2 mm and 1 mm.

[0082] Please refer to Figure 7 A schematic diagram of a planar structure of one side of a battery assembly provided in another embodiment of the present application is shown;

[0083] like Figure 2 and Figure 7 As shown, in one embodiment, the explosion-proof valve 14 is arranged in the middle of the first side wall 12a along the length direction of the battery assembly 100. The two poles 13 of the battery cell 10 are arranged on opposite sides of the explosion-proof valve 14 along the second direction 002, and the distances between the two poles 13 and the explosion-proof valve 14 are equal. The number of the support members 20 is one. That is, the support member 20 is set as the first support member 20a. The battery cell 10 includes a third side wall 12c and a fourth side wall 12d arranged oppositely along the second direction 002, and the distances between the two ends of the first support member 20a along the second direction 002 to the third side wall 12c and to the fourth side wall 12d are equal. Or it can be described that the distances between the two ends of the first support member 20a along the second direction 002 to the two poles 13 are equal. That is, the first support member 20a is arranged at the middle position of the first surface 11 of the battery cell 10 along the length direction of the first side wall 12a.

[0084] It can be understood that in this embodiment, the number of the support member 20 is set to one, and it is set at the middle position of the first surface 11 of the battery cell 10 along the length direction of the first side wall 12a, so as to ensure reliable support of the support member 20 and simplify the installation difficulty of the support member 20. In addition, based on the two poles 13 of the battery cell 10 are arranged at opposite ends of the first side wall 12a, and the poles 13 of the same polarity of two adjacent battery cells 10 are connected by a connecting piece (not shown in the figure), the support member 20 is set at the middle position of the battery cell 10 along the length direction of the first side wall 12a to prevent the battery cell 10 from being partially squeezed and causing the connecting piece to be twisted, thereby affecting the electrical connection between the battery cells 10.

[0085] In one embodiment, the support member 20 is rectangular, and along the length direction of the battery assembly 100, the ratio of the length of the support member 20 to the length of the first side wall 12a is between 2:5 and 7:10. That is, the ratio of the length of the support member 20 along the second direction 002 to the length of the first side wall 12a is between 2:5 and 7:10.

[0086] It can be understood that setting the length of the support member 20 along the second direction 002 within the ratio range can ensure the supporting effect of the support member 20 on two adjacent battery cells 10, avoid the support member 20 being too small to support, resulting in too small reserved expansion space, and at the same time avoid setting the support member 20 too large to increase costs.

[0087] In one embodiment, the ratio of the distance from the geometric center of the support member 20 to the first side wall 12a to the geometric center of the first surface 11 of the battery cell 10 is between 0 and 4:5. It should be noted that the support member 20 disposed at this position can ensure that sufficient reserved expansion space is provided in the central area of ​​the first surface 11 of the battery cell 10, while ensuring reliable bonding between adjacent battery cells 10.

[0088] In one embodiment, along the length direction of the first side wall 12a, the ratio of the distance from the geometric center of the adhesive 30 to the relatively close side wall 12 to the geometric center of the first surface 11 of the battery cell 10 is between 0 and 17:20. It should be noted that in this embodiment, the adhesive 30 disposed at this position can ensure that sufficient reserved expansion space is provided in the central area of ​​the first surface 11 of the battery cell 10, while ensuring reliable bonding between adjacent battery cells 10.

[0089] In one embodiment, the ratio of the sum of the projection areas of the support member 20 on the first surface 11 of the battery cell 10 to the area of ​​the first surface 11 of the battery cell 10 is between 0.1% and 10%; the ratio of the sum of the projection areas of the adhesive member 30 on the first surface 11 of the battery cell 10 to the area of ​​the first surface 11 of the battery cell 10 is between 20% and 70%.

[0090] It should be noted that, from the above data, it can be seen that the sum of the projected areas of the adhesive 30 on the first surface 11 of the battery cell 10 is greater than the sum of the projected areas of the support 20 on the first surface 11 of the battery cell 10, thereby ensuring that the adhesive force of the adhesive 30 on the battery cell 10 is greater than the supporting force of the support 20 on the battery cell 10, so as to ensure the stacking stability between two adjacent battery cells 10 and avoid separation between two adjacent battery cells 10. At the same time, it can also avoid that the area occupied by the adhesive 30 on the first surface 11 of the battery cell 10 is too large or the area occupied by the support 20 on the first surface 11 of the battery cell 10 is too small, resulting in too small reserved expansion space provided, affecting the heat dissipation effect.

[0091] In one embodiment, the number of adhesive members 30 is two, and the two adhesive members 30 are arranged at intervals along the length direction of the battery assembly 100, and an angle is formed between the extension line of the edge of each adhesive member 30 close to the geometric center of the first surface 11 and the extension line of the edge of the first support member 20a close to the geometric center of the first surface 11, and the angle range is between 60° and 100°. It can be understood that since the support member 20 and the adhesive member 30 are both long strips, and since the support member 20 is arranged at the middle position of the battery cell 10 along the length direction of the first side wall 12a, the angle between the extension line of the edge of the first support member 20a close to the geometric center of the first surface 11 and each adhesive member 30 is set to be between 60° and 100°, so as to ensure that sufficient reserved expansion space is provided in the avoidance area 111 of the first surface 11 of the battery cell 10, and at the same time ensure reliable bonding between adjacent battery cells 10.

[0092] Please see Figure 8 In one embodiment, the two adhesive members 30 are in contact with the first support member 20a respectively, that is, the ratio of the area of ​​the avoidance zone 111 formed by the first support member 20a and the two adhesive members 30 and the side of the first surface 11 (that is, the second side wall 12b) on the first surface 11 of the battery cell 10 to the area of ​​the first surface 11 of the battery cell 10 is between 3:20 and 18:25.

[0093] It can be understood that in this embodiment, based on the fact that the shapes of the support member 20 and the adhesive member 30 are both long strips, the ratio of the area of ​​the avoidance zone 111 formed by the support member 20 and the adhesive member 30 on the first surface 11 of the battery cell 10 to the area of ​​the first surface 11 of the battery cell 10 is set between 3:20 and 18:25 to ensure that there is sufficient reserved expansion space, while also ensuring that there is relatively reliable adhesion between two adjacent stacked battery cells 10.

[0094] exist Figure 8In the illustrated embodiment, the projections of the first support member 20a and the adhesive member 30 on the first surface 11 are both rectangular, and the first support member 20a and the adhesive member 30 are perpendicular to each other. It can be understood that this arrangement can make the shape of the avoidance area 111 relatively regular, optimize the layout of the support member 20 and the adhesive member 30, and improve the reliability of the avoidance area 111.

[0095] like Fig. 9 As shown, in one embodiment, the battery assembly 100 further includes a filling glue 40, and the filling glue 40 is disposed between two adjacent battery cells 10. The battery cell 10 includes a second side wall 12b disposed opposite to the first side wall 12a along the third direction 003, and the filling glue 40 and the support member 20 close to the first side wall 12a are arranged on both sides of the geometric center of the first surface 11 of the battery cell 10 along the third direction 003. The filling glue 40 is disposed closer to the second side wall 12b than the first side wall 12a.

[0096] It can be understood that in this embodiment, the filling glue 40 can cooperate with the support member 20 to support two adjacent stacked battery cells 10 to limit the spacing height between the two adjacent battery cells 10 and enhance the stability of the support. Further, based on the filling glue 40 being closer to the second side wall 12b relative to the first side wall 12a, it is ensured that sufficient reserved expansion space is provided in the central area of ​​the first surface 11 of the battery cell 10. At the same time, based on the fact that the filling glue 40 has a certain viscosity, the filling glue 40 can also assist the adhesive member 30 in limiting the relative displacement between the two adjacent battery cells 10.

[0097] In one embodiment, the ratio of the area of ​​the avoidance area 111 formed by the support member 20 , the adhesive member 30 , and the filling glue 40 on the first surface 11 of the battery cell 10 to the area of ​​the first surface 11 of the battery cell 10 is between 1:5 and 11:20.

[0098] It should be noted that the ratio of the area of ​​the avoidance zone 111 formed by the support member 20, the adhesive member 30 and the filling glue 40 on the first surface 11 of the battery cell 10 to the area of ​​the first surface 11 of the battery cell 10 is set between 1:5 and 11:20, which can provide sufficient reserved expansion space and further improve the adhesion between adjacent battery cells 10.

[0099] In one embodiment, along the first direction 001, the height of the support member 20 is greater than or equal to the height of the adhesive member 30. It should be noted that in the early stage of stacking the battery cells 10, the height of the support member 20 is greater than the height of the adhesive member 30 to ensure the formation of a reserved expansion space. During the use of the battery cells 10, due to a certain expansion of the battery cells 10, adjacent battery cells 10 are bonded to form a closed window, and the height of the reserved expansion space at this time is the height of the adhesive member 30. That is, setting the height of the support member 20 slightly greater than or equal to the height of the adhesive member 30 can ensure that a sufficiently large reserved expansion space is provided in the early stage of the life cycle of the battery cell 10 to prevent the battery cell 10 from being squeezed in the early stage of its life cycle, thereby affecting the service life of the battery cell 10.

[0100] The following is a comparative description of the beneficial effects that may be achieved by the battery assembly 100 of the present application in combination with some embodiments of the battery assembly 100 of the present application and a typical embodiment in the prior art:

[0101] It should be noted that in the following embodiments, the number of the support member 20 is one, and the support member 20 is disposed in the middle position of the battery cell 10 along the length direction of the first side wall 12a. At the same time, the number of the adhesive members 30 is two, and the two adhesive members 30 are disposed on opposite sides of the geometric center of the first surface 11 of the battery cell 10 along the second direction 002, and the support member 20 and the adhesive member 30 are mutually surrounded. Since both the support member 20 and the adhesive member 30 are in the shape of long strips, the area enclosed by them on the first surface 11 of the battery cell 10 can be regarded as a trapezoid or a rectangle.

[0102] Wherein, a is the distance between the two adhesive members 30 close to the support member 20 along the second direction 002; b is the distance between the two adhesive members 30 away from the support member 20 along the second direction 002; c is the length of the adhesive member 30 along the third direction 003; A is the length of the battery cell 10 along the second direction 002; B is the length of the battery cell 10 along the third direction 003. By replacing the support members 20 and adhesive members 30 of different sizes or adjusting the relative positions of the support members 20 and adhesive members 30, the sizes of a, b, and c are changed, and different enclosed areas S1, that is, different sizes of reserved expansion spaces are obtained. Reserved expansion area: S1 = (a + b) * c / 2; area of ​​the first surface 11 of the battery cell 10: S2 = A * B. The battery assembly of the prior art and the battery assembly 100 of the present application are subjected to dynamic performance tests under the same conditions. For example, the battery assembly 100 is charged and discharged in cycles at 28°C. After the cycle test is completed, the electrode in the battery cell 10 is disassembled to observe the lithium deposition of the electrode. If the ratio of the lithium deposition electrode area to the electrode area is less than 10%, it is considered to be mild lithium deposition, if it is greater than 10% and less than 50%, it is considered to be moderate lithium deposition, and if it is greater than 50%, it is considered to be severe lithium deposition.

[0103] The battery assembly in the prior art and the battery assembly 100 of the present application are subjected to tensile shear strength tests under the same conditions. For example, a 2kg weight is placed on the battery assembly and the pressure is maintained for 2 hours. After the specified time, the two ends of the battery assembly are clamped and fixed using a tensile testing machine, and one of the cells is pulled out at a rate of 5mm / min to test its maximum destructive tensile force. The maximum destructive tensile force is divided by the bonding area, that is, divided by the reserved expansion area S1, to obtain the tensile shear strength. When the shear strength is greater than 5MPa, the shear strength requirement of the battery assembly is met, and when it is less than 5MPa, the requirement is not met.

[0104] The test results of the above experiments are statistically analyzed, and the results are shown in Table 1 below:

[0105] Table 1: Wherein, the units of a, b, c, A, and B are all mm; the units of the reserved expansion area S1 and the area S2 of the first surface 11 of the battery cell 10 are all mm2; and the shear strength is MPa.

[0106]

[0107]

[0108] It can be seen from the above embodiments that the battery assembly in the prior art does not have a support member and an adhesive member to cooperate to form a reserved expansion space, and the dynamic results show that serious lithium precipitation will occur. Please refer to Comparative Examples 1-7 and Examples 1-19. It can be seen that when the ratio of the reserved expansion area to the area of ​​the first surface of the battery cell is less than 0.15, the dynamic results show that moderate lithium precipitation and severe lithium precipitation will occur; when the reserved expansion area and the area of ​​the first surface of the battery cell are between 0.15 and 0.72, the dynamic results show that only mild lithium precipitation will occur; when the reserved expansion area and the area of ​​the first surface of the battery cell are greater than 0.72, the dynamic results show that slight lithium precipitation will occur. Therefore, when the ratio of the reserved expansion area (i.e., the area of ​​the avoidance zone) to the area of ​​the first surface of the battery cell is greater than 0.15, it can be ensured that the battery cell has a good expansion space, reducing the lithium precipitation problem caused by the expansion of the battery cell.

[0109] Please refer to Comparative Examples 1-7 and Examples 1-19 again, it can be seen that when the ratio of the reserved expansion area (i.e., the area of ​​the avoidance zone) to the area of ​​the first surface of the battery cell is greater than 0.72, the shear strength of Comparative Examples 1-3 is less than 5, and then when the vibration test or impact is performed, the top battery cell is prone to move or even detach. Therefore, when the ratio of the reserved expansion area (i.e., the area of ​​the avoidance zone) to the area of ​​the first surface of the battery cell is less than 0.72, the battery cell can be guaranteed to have good stability. The present application provides sufficient reserved space for the expansion of the battery cell by setting the ratio of the reserved expansion area to the area of ​​the first surface of the battery cell between 0.15 and 0.72, avoiding mutual squeezing between the battery cells, thereby reducing the probability of lithium precipitation and improving the performance and service life of the battery assembly. At the same time, it can be obtained from the above data that the ratio of the reserved expansion area to the area of ​​the first surface of the battery cell of the present application is set between 0.15 and 0.72, and it also has good shear resistance, that is, the two adjacent stacked battery cells are firmly bonded and not easy to move, thereby improving the stability between the two adjacent batteries, and then also improving the performance and service life of the battery assembly.

[0110] The present application also provides a battery pack, which includes the battery assembly described above. Specifically, the battery pack includes a tray and a sealing cover, which together enclose a receiving cavity, and the battery assembly is located in the receiving cavity.

[0111] In addition, the present application also provides an electric power system, which includes the battery assembly or the battery pack described above. Specifically, the electric power system can be a vehicle or an energy storage system.

[0112] like Figure 1 As shown, the vehicle 200 provided in the present application includes a vehicle body 201 and a battery assembly 100. The battery assembly 100 is accommodated and fixed in the vehicle body 201, and the battery assembly is used to provide electric energy to the vehicle 200 to drive the vehicle 200. It can be understood that the battery assembly 100 of the present application can be applied to electric vehicles, including pure electric vehicles and hybrid electric vehicles.

[0113] It should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the embodiments of the present application, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0114] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0115] It should be understood that the application of this application is not limited to the above examples. For ordinary technicians in this field, they can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the claims attached to this application. Ordinary technicians in this field can understand that all or part of the processes of the above embodiments are implemented, and equivalent changes made according to the claims of this application still fall within the scope covered by this application.

Claims

1. A battery assembly, characterized in that: The invention comprises a plurality of battery cells stacked in a vertical direction, wherein a surface of one of the battery cells between two adjacent battery cells is a first surface, and a support member and an adhesive member are provided on the first surface; an avoidance area is provided on the first surface, and the geometric center of the first surface is located in the avoidance area, and the edges of the support member and the adhesive member close to the geometric center of the first surface coincide with a part of the edge of the avoidance area; The extended lines of the edges of each of the supporting members and each of the adhesive members close to the geometric center of the first surface intersect with each other to form a first intersection, and / or intersect with the edge of the first surface to form a second intersection; Wherein, if all the intersections are the second intersections, the avoidance area is an area formed by connecting and enclosing a plurality of the second intersections; If the intersections include a plurality of the first intersections and a plurality of the second intersections, and the first intersections are connected in sequence to form a closed figure on the first surface, the avoidance area is an area formed by connecting and enclosing the plurality of the first intersections; If the intersections include a plurality of the first intersections and a plurality of the second intersections, and the first intersections cannot be connected in sequence to form a closed figure on the first surface, the avoidance zone is an area formed by the sequential connection of all the first intersections and a plurality of the second intersections; The ratio of the area of ​​the avoidance zone to the area of ​​the first surface is between 3:20 and 18:

25.

2. The battery assembly according to claim 1, characterized in that: The ratio of the area of ​​the avoidance zone to the area of ​​the first surface is between 1:5 and 11:

20.

3. The battery assembly according to claim 1, characterized in that: Each of the battery cells includes a first side wall located on the same side of the battery assembly, the first side wall is perpendicular to the first surface, the battery cell includes a pole, the pole is arranged on the first side wall, and the support member includes a first support member, the first support member is arranged close to the first side wall.

4. The battery assembly according to claim 3, characterized in that: There are two poles, which are spaced apart along the length direction of the battery assembly. There is one support member, and the distances from both ends of the first support member along the length direction of the battery assembly to the two poles are equal.

5. The battery assembly according to claim 3, characterized in that: The number of the adhesives is two, and the two adhesives are arranged at intervals along the length direction of the battery assembly; an angle is formed between the extension line of the edge of each adhesive close to the geometric center of the first surface and the extension line of the edge of the first support close to the geometric center of the first surface, and the angle ranges from 60° to 100°.

6. The battery assembly according to claim 5, characterized in that: Along the width direction of the battery assembly, the first support member is arranged on one side of the avoidance area close to the first side wall, and along the length direction of the battery assembly, the adhesive members are arranged on both sides of the avoidance area along the length direction of the battery assembly, and the two adhesive members are respectively in contact with the first support member.

7. The battery assembly according to claim 6, characterized in that: The projections of the first supporting member and the adhesive member on the first surface are both rectangular, and the first supporting member and the adhesive member are perpendicular to each other.

8. The battery assembly according to claim 6, characterized in that: Along the width direction of the battery assembly, the battery assembly has a second side wall opposite to the first side wall, and the second side wall is connected to the first surface and is vertically arranged; The extension line of the edge of the support member close to the geometric center of the first surface intersects with the extension lines of the edges of the two adhesive members close to the geometric center of the first surface to form two first intersection points, the extension lines of the edges of the two adhesive members close to the geometric center of the first surface intersect with the edge connected to the second side wall to form two second intersection points, and the avoidance area is the area formed on the first surface by connecting the two first intersection points and the two second intersection points.

9. The battery assembly according to any one of claims 1 to 8, characterized in that: The ratio of the sum of the projection areas of the supporting members on the first surface to the area of ​​the first surface is between 0.1% and 10%.

10. The battery assembly according to any one of claims 1 to 8, characterized in that: The ratio of the sum of the projection areas of the adhesive members on the first surface to the area of ​​the first surface is between 20% and 70%.

11. The battery assembly according to any one of claims 1 to 8, characterized in that: Along the vertical direction, the height of the supporting member is greater than or equal to the height of the adhesive member.

12. The battery assembly according to any one of claims 4 to 8, characterized in that: The battery assembly further includes a filling glue, which is disposed between two adjacent battery cells. The battery cell includes a second side wall disposed opposite to the first side wall, and the filling glue is disposed close to the second side wall.

13. A battery pack, characterized in that: Comprising a battery assembly as described in any one of claims 1-12.

14. An electricity system, characterized in that: Includes the battery assembly as described in any one of claims 1 to 12, or includes the battery pack as described in claim 13.

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