Battery assembly, battery pack and electric system

Abstract

A battery assembly (100), a battery pack (300), and an electric system (400). The battery assembly (100) comprises a plurality of battery cells (10) stacked in a vertical direction, and further comprises supporting members (20) and bonding members (30). Any battery cell surface between two adjacent battery cells (10) is a first surface (11), and supporting members (20) and bonding members (30) are provided on the first surface (11); the supporting members (20), the bonding members (30) and the first surface (11) together define a clearance region (111) located on the first surface (11), and the area ratio of the area of the clearance region (111) to the area of the first surface (11) is within 3:20 to 18:25.

Description

Battery components, battery packs and power systems

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on October 31, 2023, with application number 202311438985.1 and invention name “Battery Assembly, Battery Pack and Power System”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] 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

[0003] A battery pack is made up of multiple cells stacked vertically, connected in series or parallel to provide all or most of the vehicle's power. As a key component of electric vehicles, the performance and service life of the battery pack are crucial.

[0004] In the prior art, stacked battery cells are typically secured together using cable ties, ensuring the stability of the battery assembly. However, after prolonged charge and discharge cycles, each cell expands to a certain extent. The cumulative expansion force of these cells is significant, and the cable ties may break, causing the cells to separate, impacting the performance and lifespan of the battery assembly. Alternatively, the cells may squeeze each other, leading to lithium deposition, which can also negatively impact the performance and lifespan of the battery assembly.

[0005] Summary of the Invention

[0006] In view of the above-mentioned deficiencies in the prior art, the purpose of this application is to provide a battery assembly, a battery pack and a power system to provide a certain amount of reserved expansion space to improve the performance and service life of the battery assembly.

[0007] In a first aspect, the present application provides a battery assembly comprising a plurality of battery cells stacked vertically, and further comprising a support member and an adhesive member, wherein a surface of one of the battery cells between two adjacent battery cells is a first surface; a clearance zone is provided on the first surface, and the geometric center of the first surface is located within the clearance zone. The support member and the adhesive member are disposed on the first surface, and the edges of the support member and the adhesive member near the geometric center of the first surface overlap with portions of the edges of the clearance zone. The extension lines of the edges of each support member and each adhesive member near the geometric center of the first surface intersect with each other at a first intersection, and / or the extension lines of the edges of either the support member and each adhesive member near the geometric center of the first surface intersect with each other at a second intersection. If all intersections are second intersections, the clearance zone is an area enclosed by the connection of the plurality of second intersections. If the intersections include a plurality of first intersections and a plurality of second intersections, and the first intersections, when connected in sequence, can form a closed figure on the first surface, the clearance zone is an area enclosed by the connection of the plurality of first intersections. 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 shape on the first surface, the avoidance zone is the area enclosed by the sequential connection of all first intersections and the plurality of 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.

[0008] The battery assembly of the present application is configured to provide electrical energy by providing a plurality of vertically stacked battery cells. A support member is provided between two adjacent battery cells to support the two adjacent battery cells. The battery assembly of the present application also includes an adhesive member provided between two adjacent battery cells to limit relative displacement between the two adjacent battery cells and prevent separation of the adjacent battery cells.

[0009] It can be understood that the battery assembly of the present application forms an escape zone on the first surface by arranging a support member and an adhesive member on the first surface and cooperating with the first surface to enclose the escape zone, so as to ensure that the two adjacent battery cells are relatively fixed and avoid separation between the two adjacent stacked battery cells. At the same time, a gap is formed on the opposite surfaces of the two adjacent battery cells to provide a certain reserved expansion space to avoid the two adjacent battery cells from squeezing each other 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.

[0010] 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.

[0011] In one embodiment, each battery cell includes a first side wall, the first side walls of all battery cells are 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.

[0012] In this embodiment, a pole is provided on the first sidewall of the battery cell, perpendicular to the first surface, to serve as a power lead. Furthermore, given the relatively greater weight of the side of the battery cell where the pole is located, a first support member is provided near the first sidewall to ensure a relatively secure expansion space.

[0013] In one embodiment, the number of poles is two, and the two poles are arranged at intervals along the length direction of the battery assembly; the number of support members is one, and the first support member includes two ends along the length direction of the battery assembly, and the distances between the two ends of the first support member and the two poles are equal.

[0014] 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. The first support member is set to have equal distances from both ends of the length direction of the battery assembly to 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, so as to prevent the battery cell from being locally squeezed and causing the connecting piece to twist.

[0015] In one embodiment, there are two adhesive members, and the two adhesive members 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 member close to the geometric center of the first surface and the extension line of the edge of the first support member close to the geometric center of the first surface, and the angle ranges from 60° to 100°.

[0016] In this embodiment, two adhesive members are spaced apart along the length direction of the battery assembly, and the angle between the extension line of the edge of the adhesive member close to the geometric center of the first surface and the extension line of the edge of the first support member close to the geometric center of the first surface is set to be between 60° and 100°, so as to ensure that the adhesive member can reliably bond the relative surfaces between the two adjacent battery cells, thereby ensuring the overall bonding reliability between the two adjacent battery cells.

[0017] In one embodiment, the first side wall is located at one end of the battery cell along the width direction of the battery assembly, and along the width direction of the battery assembly, the first support member is arranged on the side of the avoidance area close to the first side wall, and along the length direction of the battery assembly, one adhesive member is respectively arranged on two opposite 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.

[0018] In this embodiment, the first support member is arranged on the side of the avoidance area close to the first side wall along the width direction of the battery assembly, and adhesive members are respectively arranged on opposite 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 to increase the reliability of the reserved expansion space provided by the avoidance area.

[0019] In one embodiment, projections of the first supporting member and the adhesive member on the first surface are both rectangular, and a length direction of the first supporting member and a length direction of the adhesive member are perpendicular to each other.

[0020] 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 length direction of the first support member and the length direction of the adhesive member to be perpendicular to each other, so that the shape of the avoidance area is relatively regular, the layout of the support member and the adhesive member is optimized, and the reliability of the avoidance area can be improved.

[0021] In one embodiment, along the width direction of the battery assembly, the battery cell has a second side wall opposite to the first side wall, and the second side wall is connected to the first surface and is arranged perpendicularly;

[0022] The extension line of the edge of the support member close to the geometric center of the first surface intersects with the extension line of the edge of the two adhesive members close to the geometric center of the first surface to form two first intersection points. The extension line of the edge of the two adhesive members close to the geometric center of the first surface intersects with the edge connected to the second side wall to form two second intersection points. The avoidance area is the area formed on the first surface by connecting the two first intersection points and the two second intersection points.

[0023] In one embodiment, the ratio of the sum of the projected 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%.

[0024] 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 supporting effect of the support members and the reliability of the reserved expansion space.

[0025] In one embodiment, the ratio of the sum of the projected areas of the adhesive components on the surface of the battery cell to the area of ​​the surface of the battery cell is between 20% and 70%.

[0026] 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.

[0027] In one embodiment, the ratio of the sum of the projected areas of the support members on the cell surface to the area of ​​the cell surface is between 0.1% and 10%; the ratio of the sum of the projected areas of the adhesive members on the cell surface to the area of ​​the cell surface is between 20% and 70%.

[0028] 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 between 0.1% and 10%, and the ratio of the sum of the projected areas of the adhesive members on the cell surface to the area of ​​the cell surface 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 adhesive force of the adhesive members on the cell surface is greater than the supporting force of the support members on the cell surface, thereby ensuring the stability of the stacking between two adjacent cell cells and preventing separation between two adjacent cell 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 little reserved expansion space, affecting the heat dissipation effect and increasing costs.

[0029] In one embodiment, the height of the supporting member is greater than or equal to the height of the adhesive member, wherein the height is a dimension along the vertical direction.

[0030] In this embodiment, by setting the height of the support member to be slightly greater than or equal to the height of the adhesive member, sufficient expansion space is ensured in the early stage of the battery cell life cycle to prevent the battery cell from being squeezed in the early stage of its life cycle, thereby affecting the service life of the battery cell.

[0031] 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.

[0032] 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 costs.

[0033] 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.

[0034] 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 position of 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.

[0035] 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 side wall to which it is relatively close to to the distance to the geometric center of the battery cell surface is between 0 and 17:20.

[0036] In this embodiment, the ratio of the distance from the geometric center of the adhesive to its 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.

[0037] In one embodiment, the battery assembly further includes a filler, which is disposed between two adjacent battery cells.

[0038] In one embodiment, 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.

[0039] In these embodiments, a filler is provided between two adjacent battery cells and positioned close to a second sidewall opposite the first sidewall, so that the filler and the support member cooperate to support the stacked adjacent battery cells, thereby enhancing support stability. Furthermore, due to the filler's high viscosity, the filler can also assist the adhesive member in limiting relative displacement between the two adjacent battery cells.

[0040] 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.

[0041] 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 battery cell surface 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.

[0042] In a second aspect, the present application provides a battery pack comprising a battery assembly as in any of the above embodiments.

[0043] In a third aspect, the present application provides an electricity system, including a battery assembly as in any of the above embodiments or a battery pack as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. 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 creative work.

[0045] FIG1 is a schematic structural diagram of a vehicle provided in one embodiment of the present application;

[0046] FIG2 is a schematic diagram of a planar structure of one side of a battery assembly provided in one embodiment of the present application;

[0047] FIG3 is a schematic diagram of the planar structure of the other side of a battery assembly provided in one embodiment of the present application;

[0048] FIG4 is a schematic diagram of a planar structure of one side of a battery assembly provided in another embodiment of the present application;

[0049] FIG5 is a schematic diagram of a planar structure of one side of a battery assembly provided in another embodiment of the present application;

[0050] FIG6 is a schematic plan view of the structure of one side of a battery assembly provided in another embodiment of the present application;

[0051] FIG7 is a schematic diagram of a planar structure of one side of a battery assembly provided in another embodiment of the present application;

[0052] FIG8 is a schematic plan view of the structure of one side of a battery assembly provided in another embodiment of the present application;

[0053] FIG9 is a schematic plan view of the structure of one side of a battery assembly provided in another embodiment of the present application;

[0054] FIG10 is a structural block diagram of a battery pack provided in one embodiment of the present application;

[0055] FIG11 is a structural block diagram of a power system provided in one embodiment of the present application;

[0056] FIG12 is a structural block diagram of a power consumption system provided in another embodiment of the present application.

[0057] 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; 300-battery pack; 400-power system. DETAILED DESCRIPTION

[0058] To facilitate understanding of the present application, a more comprehensive description of the present application will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present application.

[0059] 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 of 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 include direct and indirect connections (couplings) unless otherwise specified. The directional terms mentioned in the present application, such as "up", "down", "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 on the present application.

[0060] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections; they can refer to direct connections, indirect connections through an intermediary, or internal connections between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances. It should be noted that the terms "first," "second," and so on, in the specification, claims, and drawings of this application are used to distinguish between different objects, not to describe a specific order. Furthermore, the terms "include," "may include," "comprise," or "may include" as used in this application indicate the presence of the corresponding functions, operations, components, etc. disclosed, and do not limit the presence or absence of one or more additional functions, operations, components, etc. Furthermore, the terms "include" or "comprising" indicate the presence of the corresponding features, numbers, steps, operations, elements, components, or combinations thereof disclosed in the specification, and do not exclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof, and are intended to cover non-exclusive inclusions.

[0061] Please refer to FIG2 for a schematic planar structural diagram of one side of a battery assembly 100 provided in one embodiment of the present application, and refer to FIG3 for a schematic planar structural diagram of the other side of a battery assembly 100 provided in one embodiment of the present application.

[0062] As shown in Figures 2 and 3, 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 opposite to each other along a first direction 001. The first direction 001 is a vertical direction. There are two battery cells 10, and the two battery cells 10 are stacked along the first direction 001. That is, the vertical direction in the present application also refers to the stacking direction of two or more battery cells 10. In order to ensure the stability of the stacked battery cells 10, the battery assembly 100 is stacked by the surface of the battery cell 10 with a larger area. Specifically, the upper surface and lower surface of the battery cell 10 have a significantly larger area than the other side surfaces. For ease of description, the upper surface and 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.

[0063] In one embodiment disclosed in the present application, the battery cell 10 further includes a pole 13 and an explosion-proof valve 14, both of which are disposed on one of the side walls 12 of the battery cell 10. Specifically, the explosion-proof valve 14 is disposed in the middle of the side wall 12 along the length of the battery assembly 100, that is, in the middle of the first side wall 12a. The length of the battery assembly 100 is the second direction 002 shown in Figures 2 and 3 and is perpendicular to the vertical direction of the battery assembly 100, that is, the first direction 001. There are two poles 13, and the two poles 13 are disposed on opposite sides of the explosion-proof valve 14 along the length of the battery assembly 100. The distance between the two poles 13 and the explosion-proof valve 14 is equal. The first side wall 12a is perpendicular to the first surface 11 of the battery cell 10. The poles 13 can serve as power lead terminals to extract the electrical energy stored in the battery cell 10. The explosion-proof valve 14 can be used to release pressure and exhaust gas, preventing the battery cell 10 from expanding and potentially exploding. In another embodiment disclosed herein, the terminal 13 and explosion-proof valve 14 are respectively disposed on different sidewalls 12 of the battery cell 10, the sidewalls 12 being connected to the upper and lower surfaces. The sidewall 12 on which the terminal 13 is disposed is the first sidewall 12a.

[0064] In addition, in the embodiment disclosed in the present application, one of the surfaces opposite to each other of two adjacent battery cells 10 in the stacking direction is the first surface 11, and a support member 20 and an adhesive member 30 are provided 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 near the geometric center of the first surface 11 coincide with part of the edge 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 on the first surface 11 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 close to 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 close to the geometric center of the first surface 11 and the edges of the first surface 11.

[0065] That is, if the extension line of the edge of the support member 20 or adhesive member 30 near 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 zone 111 is the area enclosed on the first surface 11 by the intersection of the extension lines of the edges of the multiple support members 20 or adhesive members 30 near the geometric center of the first surface 11. If the extension line of the edge of the support member 20 or adhesive member 30 near 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 zone 111 is the area enclosed on the first surface 11 by the intersection of the extension lines of the edges of the multiple support members 20 or adhesive members 30 near the geometric center of the first surface 11 and the edge of 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 area 111 is the area enclosed on the first surface 11 by the intersection of 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 and the edge of the first surface 11. The ratio of the area of ​​the avoidance area 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 area 111.

[0066] In the embodiment shown in FIG3 , 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 , i.e., the lengthwise direction of the battery assembly 100 , on opposite sides of the geometric center of the first surface 11. Each support member 20 is positioned adjacent to the first sidewall 12a. The extensions of the edges of a relatively adjacent support member 20 and adhesive member 30 near the geometric center of the first surface 11 intersect to form a first intersection 15. The extensions of the edges of the two adhesive members 30 near the geometric center of the first surface 11 intersect with the edges of the first surface 11 to form second intersections 16. The three support members 20 are interconnected and sequentially connected to the first intersection 15 and the second intersection 16 in a clockwise or counterclockwise direction to enclose a clearance zone 111. That is, the avoidance area 111 at this time is the area surrounded by the dotted line portion in FIG. 3 and the edges of the support member 20 , the adhesive member 30 , and the first surface 11 .

[0067] In this application, adjacent first intersection points 15 and / or second intersection points 16 are connected by straight lines.

[0068] In this application, the first intersection 15 and the second intersection 16 both refer to the first intersection. That is, when the extension lines of the edges of a relatively close support member 20 and an adhesive member 30 close to each other and close to the geometric center of the first surface 11 intersect with each other, and both intersect for the first time in the extension direction of the extension lines, it can be regarded as forming the first intersection 15. For another example, when the extension line of the support member 20 or the adhesive member 30 extends along a certain direction and intersects with the edge of the first surface 11, and it is the first intersection, it can be regarded as forming the second intersection 16. In particular, when the extension line of the support member 20 has already intersected with the adhesive member 30 along a certain direction, even if the extension line of the support member 20 continues to extend along the direction and intersects with the edge of the first surface 11, it is not regarded as forming the second intersection 16.

[0069] As shown in FIG4 , in one embodiment, the projections of the support member 20 and the adhesive member 30 on the first surface 11 are both rectangular. There are one support member 20 and one adhesive member 30. The support member 20 is relatively close to the first side wall 12a, and both the support member 20 and the adhesive member 30 extend along the second direction 002, i.e., the length direction of the battery assembly 100. The extension line of the edge of the support member 20 near the geometric center of the first surface 11 intersects with the edge of the first surface 11 to form a second intersection 16. The extension line of the edge of the adhesive member 30 near 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 sequentially connected to form an avoidance zone 111. That is, the avoidance zone 111 is the dotted portion in FIG4 and the area formed by the edges of the support member 20, the adhesive member 30, and the first surface 11.

[0070] As shown in Figure 5, in one embodiment, the projections of the support member 20 and the adhesive member 30 on the first surface 11 are both rectangular. There is one support member 20 and one adhesive member 30, and the support member 20 is relatively close to the first sidewall 12a. The support member 20 extends along the second direction 002, and the adhesive member 30 extends along the third direction 003. The third direction 003 is the width of the battery assembly 100. An extension line of the edge of the support member 20 near the geometric center of the first surface 11 intersects with the edge of the first surface 11 to form a second intersection 16. An extension line of the edge of the adhesive member 30 near the geometric center of the first surface 11 also intersects with the edge of the first surface 11 to form a second intersection 16. Simultaneously, the extension lines of the edges of the support member 20 and the adhesive member 30 near 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 a clearance zone 111. That is, the avoidance area 111 is the area surrounded by the dotted line portion in FIG. 5 and the edges of the support member 20 , the adhesive member 30 , and the first surface 11 .

[0071] As shown in FIG6 , in one embodiment, the projections of the support members 20 and the adhesive members 30 on the first surface 11 are both 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 each other and close to the geometric center of 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 sequentially connected to the first intersection 15 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 the dotted part in FIG6 and the area enclosed by the support members 20 and the adhesive members 30.

[0072] As shown in FIG8 , in one embodiment, along the width direction of the battery assembly 100, i.e., along the third direction 003, the battery cell 10 has a second sidewall 12b opposite the first sidewall 12a. The second sidewall 12b is connected to the first surface 11 and is disposed perpendicularly thereto. There is one support member 20, and two adhesive members 30. The extension of the edge of the support member 20 near the geometric center of the first surface 11 intersects with the extension of the edges of the two adhesive members 30 near the geometric center of the first surface 11, forming two first intersection points 15. The extension of the edges of the two adhesive members 30 near the geometric center of the first surface 11 intersects with the edges connected to the second sidewall 12b, forming two second intersection points 16. The avoidance zone 111 is the area formed on the first surface 11 by connecting the two first intersection points 15 and the two second intersection points 16. In other words, the avoidance zone 111 is the area enclosed by the support member 20, adhesive member 30, and second sidewall 12b in FIG5 .

[0073] It should be noted that the avoidance area 111 in the above embodiment is merely 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 based on the number, shape, and arrangement of the support members 20 and adhesive members 30, as long as the ratio of the area of ​​the avoidance area 111 to the area of ​​the first surface 11 is between 3:20 and 18:25. This application does not elaborate on this in detail.

[0074] It can be understood that the battery assembly 100 of the present application is provided with a support member 20 and an adhesive member 30 on the first surface 11 and cooperates with the first surface 11 to form an avoidance area 111 to ensure that the two adjacent battery cells 10 are relatively fixed and avoid separation between the two adjacent stacked battery cells 10. At the same time, since the support member 20 and the adhesive member 30 have a certain height, a gap is formed on the relative surfaces of the two adjacent battery cells 10 to provide a certain reserved expansion space, thereby avoiding the mutual squeezing between the two adjacent battery cells 10 due to excessive expansion force, thereby reducing the probability of lithium deposition in 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 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.

[0075] 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. Because the reserved expansion space provided within this range is sufficiently large, the support member 20 provides a relatively good supporting effect, and the adhesive member 30 provides a relatively stable bonding effect, the probability of lithium deposition in the battery cell 10 can be further reduced, further improving the performance and service life of the battery assembly 100.

[0076] In the above embodiment, the geometric center of the avoidance area 111 coincides with the geometric center of the first surface 11. As will be appreciated, since swelling of the battery cell 10 typically occurs in the central region 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 is effectively utilized.

[0077] 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 near 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 support for the stacked adjacent battery cells 10, so that there is a certain gap between the two adjacent battery cells 10, which is used to provide a certain amount of reserved expansion space for the battery cells 10.

[0078] 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.

[0079] 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 along the second direction 002 on opposite sides of the geometric center of the first surface 11 of the battery cell 10, 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. 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.

[0080] It should be noted that the shape, quantity and position of the adhesive 30 are only introduced as an example 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.

[0081] 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.

[0082] In one embodiment disclosed herein, the support member 20 may be made of polydimethylsiloxane, so that the support member 20 has a slight elasticity while also having a strong rigid support capability. The adhesive member 30 may be made of polybutyl acrylate, so that the adhesive member 30 has a strong adhesive force.

[0083] In one embodiment, the thickness of the support member 20 along the first direction 001 is between 0.5 mm and 2 mm.

[0084] In one embodiment, the thickness of the adhesive member 30 along the first direction 001 is between 0.2 mm and 1 mm.

[0085] Please refer to FIG. 7 , which shows a schematic planar structural diagram of one side of a battery assembly provided in another embodiment of the present application;

[0086] As shown in Figures 2 and 7, in one embodiment, the explosion-proof valve 14 is disposed in the middle of the first side wall 12a along the length of the battery assembly 100. The two poles 13 of the battery cell 10 are disposed 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. There is one support member 20. Specifically, the support member 20 is configured as a first support member 20a. The battery cell 10 includes a third side wall 12c and a fourth side wall 12d disposed opposite each other along the second direction 002. The distances between the first support member 20a and the third side wall 12c and the fourth side wall 12d, respectively, along the second direction 002 are equal. Alternatively, the distances between the first support member 20a and the two poles 13, respectively, along the second direction 002 are equal. Specifically, the first support member 20a is disposed in the middle of the first surface 11 of the battery cell 10 along the length of the first side wall 12a.

[0087] It will be appreciated that in this embodiment, the number of support members 20 is set to one, and it is disposed in the middle of the first surface 11 of the battery cell 10 along the length direction of the first side wall 12a. This ensures reliable support of the support member 20 while simplifying the installation of the support member 20. In addition, since the two poles 13 of the battery cell 10 are disposed 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 disposed in the middle of the battery cell 10 along the length direction of the first side wall 12a to prevent the battery cell 10 from being locally squeezed and causing the connecting piece to twist, thereby affecting the electrical connection between the battery cells 10.

[0088] 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.

[0089] 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 the two adjacent battery cells 10, avoid the support member 20 being too small to support, resulting in the reserved expansion space being too small, and at the same time avoid setting the support member 20 too large to increase costs.

[0090] In one embodiment, the ratio of the distance from the geometric center of the support member 20 to the first sidewall 12a to the distance 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 in this position can ensure that sufficient 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.

[0091] In one embodiment, along the length of the first sidewall 12a, the ratio of the distance from the geometric center of the adhesive member 30 to the adjacent sidewall 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 member 30 disposed in this position ensures sufficient expansion space in the central area of ​​the first surface 11 of the battery cell 10, while also ensuring reliable bonding between adjacent battery cells 10.

[0092] In one embodiment, the ratio of the sum of the projected 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 projected 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%.

[0093] It should be noted that, as can be seen from the above data, 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 member 20 on the first surface 11 of the battery cell 10. This ensures that the adhesive force of the adhesive 30 on the battery cell 10 is greater than the supporting force of the support member 20 on the battery cell 10, thereby ensuring the stacking stability of two adjacent battery cells 10 and preventing separation between two adjacent battery cells 10. This also prevents the adhesive 30 from occupying too large an area on the first surface 11 of the battery cell 10 or the support member 20 from occupying too small an area on the first surface 11 of the battery cell 10, thereby preventing the reserved expansion space from being too small and affecting the heat dissipation effect.

[0094] In one embodiment, there are two adhesive members 30, and the two adhesive members 30 are spaced apart along the length of the battery assembly 100. An angle is formed between the extension line of the edge of each adhesive member 30 near the geometric center of the first surface 11 and the extension line of the edge of the first support member 20a near the geometric center of the first surface 11, and the angle range is between 60° and 100°. It can be understood that since both the support member 20 and the adhesive member 30 are elongated, and since the support member 20 is positioned in the middle of the length of the battery cell 10 along the first side wall 12a, the angle between the extension line of the edge of the first support member 20a near the geometric center of the first surface 11 and each adhesive member 30 is set to be between 60° and 100° to ensure that sufficient expansion space is reserved in the avoidance area 111 of the first surface 11 of the battery cell 10, while ensuring reliable bonding between adjacent battery cells 10.

[0095] Please refer to Figure 8. In one embodiment, the two adhesive members 30 are respectively in contact with the first support member 20a. 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.

[0096] 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 the two adjacent stacked battery cells 10.

[0097] In the embodiment shown in Figure 8 , the projections of the first support member 20a and the adhesive member 30 on the first surface 11 are both rectangular, and the length direction of the first support member 20a is perpendicular to the length direction of the adhesive member 30. As will be appreciated, this arrangement can make the shape of the avoidance zone 111 relatively regular, optimize the layout of the support member 20 and the adhesive member 30, and improve the reliability of the avoidance zone 111. The length direction of the first support member 20a and the length direction of the adhesive member 30 can be the direction in which the longest sides of the first support member 20a and the adhesive member 30 extend.

[0098] As shown in Figure 9, in one embodiment, the battery assembly 100 further includes a filler 40 disposed between two adjacent battery cells 10. In one embodiment, the battery cell 10 includes a second sidewall 12b disposed opposite the first sidewall 12a along a third direction 003. The filler 40 and the support member 20 adjacent to the first sidewall 12a are arranged along the third direction 003 on either side of the geometric center of the first surface 11 of the battery cell 10. The filler 40 is disposed closer to the second sidewall 12b than to the first sidewall 12a.

[0099] It will be appreciated that in this embodiment, the filler 40 can cooperate with the support member 20 to support two adjacent stacked battery cells 10, thereby limiting the spacing height between the two adjacent battery cells 10 and enhancing the stability of the support. Furthermore, since the filler 40 is closer to the second side wall 12b than the first side wall 12a, sufficient reserved expansion space is provided in the central area of ​​the first surface 11 of the battery cell 10. At the same time, since the filler 40 has a certain viscosity, the filler 40 can also assist the adhesive member 30 in limiting the relative displacement between the two adjacent battery cells 10.

[0100] In one embodiment, the ratio of the area of ​​the avoidance zone 111 formed by the support member 20 , the adhesive member 30 , and the filler 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.

[0101] 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.

[0102] 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, wherein the height of the support member 20 and the height of the adhesive member 30 are the dimensions of the support member 20 and the adhesive member 30 along the first direction 001, i.e., the vertical direction / stacking direction. 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 that a reserved expansion space is formed. 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, thereby preventing 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.

[0103] The following describes the beneficial effects that may be achieved by the battery assembly 100 of the present application by comparing some embodiments of the battery assembly 100 of the present application with a typical embodiment in the prior art:

[0104] It should be noted that in the following embodiments, there is one support member 20, which is positioned midway along the length of the first sidewall 12a of the battery cell 10. Furthermore, there are two adhesive members 30, which are positioned on opposite sides of the geometric center of the first surface 11 of the battery cell 10 along the second direction 002. The support member 20 and the adhesive member 30 surround each other. Since both the support member 20 and the adhesive member 30 are elongated, the area enclosed by them on the first surface 11 of the battery cell 10 can be considered a trapezoid or rectangle.

[0105] Where a is the distance between the two adhesive members 30 on the side closest to the support member 20 along the second direction 002; b is the distance between the two adhesive members 30 on the side 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; and B is the length of the battery cell 10 along the third direction 003. By replacing 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 can be changed to obtain different enclosed areas S1, that is, different sizes of reserved expansion space. Reserved expansion area: S1 = (a + b) * c / 2; Area of ​​the first surface 11 of the battery cell 10: S2 = A * B. Dynamic performance tests were conducted on a conventional battery assembly and the battery assembly 100 of the present application under the same conditions. For example, the battery assembly 100 was subjected to charge and discharge cycles at 28°C. After the cycle test is completed, the electrode in the battery cell 10 is disassembled and the lithium deposition of the electrode is observed. If the ratio of the area of ​​the electrode with lithium deposition 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.

[0106] The battery assembly in the prior art and the battery assembly 100 of the present application are subjected to a tensile shear strength test 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, a tensile testing machine is used to clamp the two ends of the battery assembly, 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.

[0107] The test results of the above experiments are statistically analyzed, and the results are shown in Table 1 below:

[0108] 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; the shear strength is MPa.

[0109] 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 deposition will occur. Please refer to Comparative Examples 1-7 and Examples 1-19 to see 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 deposition and severe lithium deposition 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 deposition 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 deposition 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 problem of lithium deposition caused by expansion of the battery cell.

[0110] 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 lower than 5, and then when undergoing vibration testing or being impacted, the top battery cell is prone to movement or even detachment. 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, thereby avoiding mutual squeezing between the battery cells, thereby reducing the probability of lithium plating and improving the performance and service life of the battery assembly. At the same time, it can be seen from the above data that the ratio of the reserved expansion area of ​​the present application to the area of ​​the first surface of the battery cell 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 thus also improving the performance and service life of the battery assembly.

[0111] 10 , the present application further provides a battery pack 300, which includes the aforementioned battery assembly 100. Specifically, the battery pack 300 includes a tray and a sealing cover, which together form a receiving cavity, and the battery assembly 100 is located in the receiving cavity.

[0112] Referring to Figures 11 and 12 , the present application also provides a power system 400, which includes the aforementioned battery assembly 100 or the aforementioned battery pack 300. For example, as shown in Figure 11 , the power system 400 includes the aforementioned battery assembly 100, and as shown in Figure 12 , the power system 400 includes the aforementioned battery pack 300. Specifically, the power system 400 can be the aforementioned vehicle 200, or it can also be an energy storage system.

[0113] As shown in Figure 1, the vehicle 200 provided in this application includes a vehicle body 201 and a battery assembly 100. The battery assembly 100 is housed and secured within the vehicle body 201 and is used to provide electrical energy to the vehicle 200, thereby driving the vehicle 200. It is understood that the battery assembly 100 of this application can be applied to electric vehicles, including pure electric vehicles and hybrid electric vehicles.

[0114] It should be understood that the terms "first," "second," etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the 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 this application, "plurality" means two or more, unless otherwise specifically defined.

[0115] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with an embodiment or example is included in at least one embodiment or example of the present application. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0116] It should be understood that the application of this application is not limited to the above examples. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the scope of protection of the claims appended to this application. Those skilled in the art will understand that implementing all or part of the processes of the above embodiments and making equivalent changes in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A battery assembly (100), characterized in that: include: A plurality of battery cells (10) stacked in a vertical direction; wherein a surface of one of the battery cells (10) between two adjacent battery cells (10) is a first surface (11), an avoidance area (111) is provided on the first surface (11), and a geometric center of the first surface (11) is located in the avoidance area (111); and A support member (20) and an adhesive member (30), wherein the support member (20) and the adhesive member (30) are arranged on the first surface (11), and edges of the support member (20) and the adhesive member (30) close to the geometric center of the first surface (11) overlap with a portion of the edge of the avoidance area (111); wherein the extended lines of the edges of each of the supporting members (20) and each of the adhesive members (30) close to the geometric center of the first surface (11) intersect with each other to form a first intersection point (15), and / or intersect with the edge of the first surface (11) to form a second intersection point (16); Wherein, if all the intersection points are the second intersection points (16), the avoidance area (111) is an area enclosed by connecting a plurality of the second intersection points (16); If the intersections include a plurality of the first intersections (15) and a plurality of the second intersections (16), and the first intersections (15) are connected in sequence to form a closed figure on the first surface, the avoidance area (111) is an area formed by connecting and enclosing the plurality of the first intersections; If the intersections include a plurality of the first intersections (15) and a plurality of the second intersections (16), and the first intersections (15) cannot be connected in sequence to form a closed figure on the first surface (11), the avoidance area (111) is an area formed by all the first intersections (15) and a plurality of the second intersections (16) connected in sequence; 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.

2. The battery assembly (100) according to claim 1, characterized in that: 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.

3. The battery assembly (100) according to claim 1 or 2, characterized in that: Each of the battery cells (10) comprises a first side wall (12a), the first side walls (12a) of all the battery cells (10) are located on the same side of the battery assembly (100), the first side wall (12a) is perpendicular to the first surface (11), the battery cell (10) comprises a pole (13), the pole (13) is arranged on the first side wall (12a), and the support member (20) comprises a first support member (20a), and the first support member (20a) is arranged close to the first side wall (12a).

4. The battery assembly (100) according to claim 3, characterized in that: The number of the poles (13) is two, and the two poles (13) are arranged at intervals along the length direction of the battery assembly (100); the number of the support member (20) is one, and the first support member (20a) includes two ends along the length direction of the battery assembly (100), and the distances between the two ends of the first support member (20a) and the two poles (13) are equal.

5. The battery assembly (100) according to claim 3, characterized in that: The number of the adhesive members (30) is two, and the two adhesive members (30) are arranged at intervals along the length direction of the battery assembly (100); an angle is formed between an extension line of an edge of each adhesive member (30) close to the geometric center of the first surface (11) and an extension line of an edge of the first support member (20a) close to the geometric center of the first surface (11), and the angle is in the range of 60° to 100°.

6. The battery assembly (100) according to claim 5, characterized in that: The first side wall (12a) is located at one end of the battery cell (10) along the width direction of the battery assembly (100); along the width direction of the battery assembly (100), the first support member (20a) is arranged on one side of the avoidance zone (111) close to the first side wall (12a); along the length direction of the battery assembly (100), one adhesive member (30) is arranged on each side of the avoidance zone (111) along the length direction of the battery assembly (100); and the two adhesive members (30) are in contact with the first support member (20a) respectively.

7. The battery assembly (100) according to any one of claims 3 to 6, characterized in that: The projections of the first supporting member (20a) and the adhesive member (30) on the first surface (11) are both rectangular, and the length direction of the first supporting member (20a) and the length direction of the adhesive member (30) are perpendicular to each other.

8. The battery assembly (100) according to claim 5 or 6, characterized in that: Along the width direction of the battery assembly (100), the battery cell (10) 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 arranged vertically; 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) to form 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 edge connected to the second side wall (12b) to 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).

9. The battery assembly (100) according to any one of claims 1 to 8, characterized in that: The ratio of the sum of the projection areas of the respective support members (20) on the first surface (11) to the area of ​​the first surface (11) is between 0.1% and 10%.

10. The battery assembly (100) according to any one of claims 1 to 8, characterized in that: The ratio of the sum of the projection areas of the various adhesive members (30) on the first surface (11) to the area of ​​the first surface (11) is between 20% and 70%.

11. The battery assembly (100) according to any one of claims 1 to 8, characterized in that: The height of the support member (20) is greater than or equal to the height of the adhesive member (30), wherein the height is a dimension along the vertical direction.

12. The battery assembly (100) according to any one of claims 4 to 8, characterized in that: The battery assembly (100) further comprises a filling glue (40), wherein the filling glue (40) is arranged between two adjacent battery cells (10).

13. The battery assembly (100) according to claim 12, characterized in that: The battery core (10) comprises a second side wall (12b) arranged opposite to the first side wall (12a), and the filling glue (40) is arranged close to the second side wall (12b).

14. A battery pack, characterized in that: Comprising the battery assembly (100) according to any one of claims 1 to 13.

15. An electricity system, characterized in that: Includes the battery assembly (100) as described in any one of claims 1 to 13, or includes the battery pack as described in claim 14.

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