Battery assembly, battery pack, and electric system

Abstract

An electric system, having a battery pack, wherein the battery pack has a battery assembly. The battery assembly comprises a plurality of battery cells stacked in the vertical direction, a support member and an adhesive member. In the battery assembly, the adhesive member and the support member jointly cooperate to prevent two stacked adjacent battery cells from separating from each other, and a gap is also formed in the central area of opposite surfaces of the two adjacent battery cells to provide a reserved expansion space, thereby preventing the two adjacent battery cells from squeezing each other due to excessive expansion force. In addition, the support member is positioned close to a first side wall to ensure that the reserved expansion space formed in the central area of first surfaces is relatively reliable.

Description

Battery components, battery packs and power systems

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on October 31, 2023, with the invention name "Battery Assembly, Battery Pack and Power System" and application number 202322941357.7, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery assembly, a battery pack, and a power system. Background Art

[0004] In related technologies, stacked battery cells are typically secured with cable ties around the outside of the cells to ensure the stability of the battery assembly. However, after a battery assembly undergoes long-term charge and discharge cycles, each cell will expand to a certain extent, and the cumulative expansion force of multiple cells is significant. If there is insufficient space to absorb this expansion, the cable ties may break, causing the cells to separate, affecting the performance and lifespan of the battery assembly. Alternatively, the cells may squeeze each other, resulting in lithium deposition, which can also have a negative impact on the performance and lifespan of the battery assembly.

[0005] Application Contents

[0006] The technical problem to be solved by the present application is: to address the problem that the battery cells in the relevant battery components squeeze each other, thereby causing lithium deposition and reducing the performance and service life of the battery components, a battery component, a battery pack and an electric vehicle are proposed.

[0007] In order to solve the above technical problems, on the first aspect, the present application provides a battery assembly, comprising a plurality of battery cells, support members and adhesive members stacked in a vertical direction, wherein the surfaces opposite to each other of the two adjacent battery cells along the vertical direction are respectively first surfaces, the support member and the adhesive member are arranged on the first surface, and the edge of the avoidance area is provided with the support member and the adhesive member; wherein each of the battery cells comprises a first side wall located on the same side of the battery assembly along the horizontal direction, the first side wall is connected to the first surface, the pole of the battery cell is arranged on the first side wall, and the support member is arranged adjacent to the first side wall.

[0008] In one embodiment of the present application, the battery cell further has a second side wall, and the second side wall is connected to both the first side wall and the first surface; the adhesive is disposed adjacent to the second side wall.

[0009] In one embodiment of the present application, a distance from any position of the edge of the support member close to the first side wall to the plane where the first side wall is located is smaller than a distance from the geometric center of the first surface to the plane where the edge of the support member away from the first side wall is located;

[0010] And / or, the distance from any position of the edge of the adhesive close to the second side wall of the battery cell to the plane where the second side wall of the battery cell is located is less than the distance from the geometric center of the first surface to the plane where the edge of the adhesive away from the second side wall is located.

[0011] In one embodiment of the present application, the ratio of the distance from any position of the edge of the support member close to the first side wall to the plane where the first side wall is located to the distance from the geometric center of the first surface to the plane where the edge of the support member away from the first side wall is located is in a range of 0 to 0.8.

[0012] In one embodiment of the present application, the ratio of the distance from any position of the edge of the adhesive close to the second side wall of the battery cell to the plane where the second side wall of the battery cell is located to the distance from the geometric center of the first surface to the plane where the edge of the adhesive away from the second side wall is located is in a range of 0 to 0.85.

[0013] In one embodiment of the present application, the number of the adhesive members is at least two, and at least two of the adhesive members are arranged at intervals along the length direction of the battery assembly, and a preset angle is provided between the extension direction of each adhesive member and the extension direction of the support member, and the preset angle is between 0°-90°.

[0014] In an embodiment of the present application, projections of the support member and the adhesive member on the first surface are both rectangular, and an extension direction of the support member is perpendicular to an extension direction of the adhesive member.

[0015] In one embodiment of the present application, the support member extends along the length direction of the battery assembly or the width direction of the battery assembly and is located between two adjacent poles, wherein the length direction of the battery assembly and the width direction of the battery assembly are both perpendicular to the vertical direction.

[0016] In one embodiment of the present application, a plurality of support members are provided, and the support members are arranged at intervals along the length direction of the battery assembly or the width direction of the battery assembly.

[0017] In an embodiment of the present application, a ratio of a projection area of ​​the support member on the first surface to an area of ​​the first surface is between 0.1% and 10%.

[0018] In one embodiment of the present application, a ratio of a projected area of ​​the adhesive on the first surface to an area of ​​the first surface is between 20% and 70%.

[0019] In one embodiment of the present application, a projected area of ​​the support member on the first surface is smaller than a projected area of ​​the adhesive member on the first surface.

[0020] In one embodiment of the present application, the geometric center of the first surface is located in the avoidance area.

[0021] In one embodiment of the present application, the battery assembly further includes a filling glue, which is arranged between two adjacent battery cells and located on the first surface. The battery cell also has a third side wall, and the third side wall and the first side wall are arranged opposite to each other along the width direction of the battery assembly. The filling glue is arranged adjacent to the third side wall.

[0022] In one embodiment of the present application, a distance from an edge of the filling glue adjacent to the third sidewall to the third sidewall is smaller than a distance from a geometric center of the first surface to an edge of the filling glue adjacent to a geometric center of the avoidance area.

[0023] In a second aspect, the present application provides a battery pack comprising the battery assembly described above.

[0024] In a third aspect, the present application provides an electricity system, which includes the battery assembly described above, or includes the battery pack described above.

[0025] The beneficial effects of the present application are as follows: 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, thereby creating a gap between the two adjacent battery cells to provide a certain amount of reserved expansion space for the battery cells. The battery assembly of the present application also provides an adhesive member between the two adjacent battery cells to limit the relative displacement between the two adjacent battery cells, thereby preventing separation of the adjacent battery cells. Furthermore, because the support member and adhesive member are provided between the two adjacent battery cells to cooperate with each other to prevent separation of the stacked adjacent battery cells, the battery assembly of the present application also forms a gap in the central area of ​​the opposing surfaces of the two adjacent battery cells to provide reserved expansion space, thereby preventing the adjacent battery cells from being squeezed against each other due to excessive expansion force, thereby improving the performance and service life of the battery module. In addition, after defining an escape zone between the two batteries, since the side of the battery cell with the terminal is relatively heavy, a support member is provided near the first sidewall to ensure that the reserved expansion space formed in the central area of ​​the first surface is relatively reliable, thereby preventing the top battery cell from shifting toward the terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG1 is a schematic structural diagram of a vehicle provided in one embodiment of the present application.

[0027] FIG2 is a schematic diagram of the planar structure of one side of a battery assembly provided in one embodiment of the present application.

[0028] FIG3 is a schematic diagram of the planar structure of the other side of the battery assembly provided in one embodiment of the present application.

[0029] FIG4 is a schematic diagram of the planar structure of one side of a battery assembly provided in another embodiment of the present application.

[0030] FIG5 is a schematic diagram of the planar structure of one side of a battery assembly provided in another embodiment of the present application.

[0031] FIG6 is a schematic diagram of the planar structure of one side of a battery assembly provided in another embodiment of the present application.

[0032] FIG7 is a schematic diagram of the planar structure of one side of a battery assembly provided in another embodiment of the present application.

[0033] FIG8 is a schematic diagram of the planar structure of one side of a battery assembly provided in another embodiment of the present application.

[0034] FIG9 is a schematic plan view of the structure of one side of a battery assembly provided in another embodiment of the present application;

[0035] FIG10 is a schematic block diagram of a battery pack provided in one embodiment of the present application.

[0036] Figure numbers: 200-vehicle; 201-body; 202-battery pack; 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; 13-pole; 20-support member; 20a-first support member; 30-adhesive member; 40-filling glue; 001-first direction; 002-second direction; 003-third direction.

[0037] Implementation Method

[0038] 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.

[0039] 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.

[0040] 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.

[0041] Please refer to Figure 2 for a schematic planar structural diagram of one side of a battery assembly 100 provided in one embodiment of the present application, and to Figure 3 for a schematic planar structural diagram of the other side of a battery assembly 100 provided in one embodiment of the present application. In this embodiment of the present application, as shown in Figures 2-9, a first direction 001 is a vertical direction, which is also the stacking direction of the battery cells 10. A second direction 002 is the length direction of the battery assembly 100. A third direction 003 is the width direction of the battery assembly 100.

[0042] As shown in Figure 2, the battery assembly 100 of the present application includes a plurality of battery cells 10, a support member 20 and an adhesive member 30 stacked in a vertical direction. The plurality of battery cells 10 are stacked in a vertical direction, and along the vertical direction, the surfaces opposite to each other between two adjacent battery cells 10 are first surfaces 11, on which the support member 20 and the adhesive member 30 are provided. The first surface 11 is also provided with an avoidance area 111, and the edge of the avoidance area 111 is provided with the support member 20 and the adhesive member 30; each battery cell 10 includes a first side wall 12a located on the same side of the battery assembly 100 in a horizontal direction, the first side wall 12a is connected to the first surface 11, the pole 13 of the battery cell 10 is provided on the first side wall 12a, and the support member 20 is provided adjacent to the first side wall 12a.

[0043] In the embodiments disclosed herein, as shown in Figures 2-8, a battery assembly 100 is provided with a plurality of battery cells 10 stacked vertically to provide electrical energy. A support member 20 is provided between two adjacent battery cells 10 to support the two adjacent battery cells 10, thereby providing a certain gap between the two adjacent battery cells 10 to provide a certain amount of reserved expansion space for the battery cells 10. The battery assembly 100 of the present application also provides an adhesive member 30 between two adjacent battery cells 10 to limit the relative displacement between the two adjacent battery cells 10 and prevent separation of the adjacent battery cells 10. Furthermore, the battery assembly 100 disclosed in the embodiments of the present application also provides a support member 20 and an adhesive member 30 between two adjacent battery cells 10 to prevent separation of the stacked adjacent battery cells 10. A clearance zone 111 is formed between the opposing surfaces of the two adjacent battery cells 10 by the support member 20 and the adhesive member 30 to provide reserved expansion space, thereby preventing the adjacent battery cells 10 from being squeezed against each other due to excessive expansion force, thereby improving the performance and service life of the battery assembly 100. In addition, after defining the avoidance area 111 between the two batteries, since the side of the battery cell 10 where the pole 13 is provided is heavier than other positions, a support member 20 is provided near the first side wall 12a to ensure that the reserved expansion space formed in the central area of ​​the first surface 11 is relatively reliable, thereby preventing the top battery cell 10 from shifting toward the pole 13 side.

[0044] In one embodiment disclosed in the present application, as shown in Figures 2 to 8, 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 multiple battery cells 10, and multiple battery cells 10 are stacked along the first direction 001. After two adjacent battery cells 10 are stacked, the relative surfaces of the two battery cells 10, that is, the upper surface of the bottom battery cell 10 and the lower surface of the top battery cell 10, are both first surfaces 11, and the adhesive 30 and the support 20 are respectively connected to the first surfaces 11 of the upper and lower battery cells 10. Furthermore, the upper surface and the lower surface of the battery cell 10 have a significantly larger area than the other side surfaces to ensure the stability of the stacking of the battery cells 10. For the sake of convenience of description, the upper surface and the lower surface of the battery cell 10 are defined as the large surfaces of the battery cell 10, and the large surface of any one of the battery cells 10 is the first surface 11.

[0045] In addition, in the embodiment of the present application, as shown in Figures 2-8, the battery cell 10 also includes two poles 13. The two poles 13 are spaced apart and arranged on one of the side walls 12 of the battery cell 10, namely, on the first side wall 12a. The first side wall 12a is connected to the first surface 11 of the battery cell 10 and is perpendicular to the first surface 11 of the battery cell 10. The pole 13 can serve as a power lead-out terminal to extract the electrical energy stored in the battery cell 10. The support member 20 is disposed adjacent to the first side wall 12a. Specifically, in the embodiment of the present application, the end surface of the battery cell 10 near the pole 13 is larger than the other end surfaces. Therefore, when two battery cells 10 are stacked in the vertical direction, the top cell 10 is prone to tilting or moving toward the side near the pole 13. Therefore, arranging the support member 20 near the first side wall 12a can provide support for the top portion and reduce the tendency of the top cell 10 to tilt toward the pole 13.

[0046] In one embodiment of the present application, the edge of the avoidance area 111 is provided with a support member 20 and an adhesive member 30, that is, the support member 20 and the adhesive member 30 together enclose the avoidance area 111. In other embodiments of the present application, the edge of the avoidance area 111 is provided with a support member 20 and an adhesive member 30, that is, part of the edge of the avoidance area 111 is defined by the support member 20 and the adhesive member 30, and the remaining portion of the edge of the avoidance area 111 can be defined by an extension line or a connecting line of the edges of the support member 20 and the adhesive member 30, such as shown in Figures 4 and 5.

[0047] In one embodiment disclosed herein, after two battery cells 10 are stacked along a first direction 001, the poles 13 of the top battery cell 10 and the poles 13 of the bottom battery cell 10 can be disposed at opposite ends, or the poles 13 of the top battery cell 10 and the poles 13 of the bottom battery cell 10 can be disposed at opposite ends, for example, along the surfaces of the battery cells 10 at both ends in the length or width direction of the battery assembly 100. In this arrangement, the support members 20 should be disposed on the first surface 11, respectively, adjacent to the ends of the poles 13 of the two battery cells 10, thereby reducing the risk of the top battery cell 10 shifting toward the poles 13 and improving the safety and reliability of the battery assembly 100.

[0048] In one embodiment disclosed in the present application, as shown in Figures 3 to 9, the support member 20 extends along the length direction of the battery assembly 100 or the width direction of the battery assembly 100 and is located between two adjacent poles 13. Specifically, the support member 20 is located between the two poles 13, that is, the projection points of the two ends of the support member 20 along the extension direction on the first side wall 12a are located between the two poles 13. In addition, the area between the two poles 13 can be an area where the first surface 11 is divided by a tangent line along the first direction 001 at the farthest points of the two poles 13. Therefore, the projection of the end of the support member 20 along the extension direction on the first side wall 12a can overlap with the pole 13. In this embodiment, positioning the support member 20 between the two poles 13 can reduce the length of the support member 20 and reduce the cost of the support member 20 while ensuring that the support member 20 plays a role in limiting the offset of the top battery cell 10.

[0049] In one embodiment disclosed in the present application, as shown in FIG3 , a plurality of support members 20 are provided, and the support members 20 are arranged at intervals along the length direction of the battery assembly 100 , thereby further reducing the cost of the support members 20 .

[0050] In one embodiment disclosed in the present application, the thickness of the support member 20 along the first direction 001 is between 0.5 mm and 2 mm.

[0051] In one embodiment disclosed in the present application, the thickness of the adhesive member 30 along the first direction 001 is between 0.2 mm and 1 mm.

[0052] In one embodiment disclosed herein, as shown in Figures 6-9 , the battery cell 10 further comprises a second sidewall 12b, which is connected to both the first sidewall 12a and the first surface 11. An adhesive member 30 is disposed adjacent to the second sidewall 12b. The placement of the adhesive member 30 adjacent to the second sidewall 12b increases the area of ​​the escape zone 111 provided on the first surface 11, thereby ensuring ample expansion space for the battery cell 10 and preventing severe lithium deposition.

[0053] Furthermore, the support member 20 is disposed adjacent to the first sidewall 12a, meaning that the distance from any position of the support member 20 near the edge of the first sidewall 12a to the plane containing the first sidewall 12a is less than the distance from the geometric center of the first surface 11 to the plane containing the edge of the support member 20 away from the first sidewall 12a. Specifically, as shown in FIG9 , the distance from any position of the support member 20 near the edge of the first sidewall 12a to the plane containing the first sidewall 12a is B1, and the distance from the geometric center of the first surface 11 to the plane containing the edge of the support member 20 away from the first sidewall 12a is B2, where B1 < B2.

[0054] Furthermore, the adhesive member 30 is disposed adjacent to the second side wall 12b, meaning that the distance from any position of the adhesive member 30 near the edge of the second side wall 12b of the battery cell 10 to the plane containing the second side wall 12b of the battery cell 10 is less than the distance from the geometric center of the first surface 11 to the plane containing the edge of the adhesive member 30 away from the second side wall 12b. Specifically, as shown in FIG9 , the distance from any position of the adhesive member 30 near the edge of the second side wall 12b of the battery cell 10 to the plane containing the second side wall 12b of the battery cell 10 is A1, and the distance from the geometric center of the first surface 11 to the plane containing the edge of the adhesive member 30 away from the second side wall 12b is A2, where A1<A2.

[0055] In one embodiment disclosed in the present application, the ratio of the distance from any position of the edge of the support member 20 close to the first side wall 12a to the plane where the first side wall 12a is located to the distance from the geometric center of the first surface 11 to the plane where the edge of the support member 20 away from the first side wall 12a is located is in a range of 0 to 0.8. Specifically, as shown in FIG9 , the distance from any position of the edge of the support member 20 close to the first side wall 12a to the plane where the first side wall 12a is located is B1, and the distance from the geometric center of the first surface 11 to the plane where the edge of the support member 20 away from the first side wall 12a is B2, where 0 <B1 / B2<4 / 5。

[0056] In this embodiment, the ratio of the distance from the geometric center of the support member 20 to the first side wall 12a to the distance to the geometric center of the surface of the battery cell 10 is set between 0 and 0.8, ensuring that the support member 20 is relatively far from the geometric center of the surface of the battery cell 10, thereby ensuring sufficient reserved expansion space in the central area of ​​the surface of the battery cell 10. In addition, the risk of the top battery cell 10 shifting or tilting toward the terminal 13 is reduced, thereby improving battery safety.

[0057] In one embodiment disclosed in the present application, the ratio of the distance between any position of the adhesive 30 close to the edge of the second side wall 12b of the battery cell 10 and the plane where the second side wall 12b of the battery cell 10 is located to the distance between the geometric center of the first surface 11 and the plane where the edge of the adhesive 30 away from the second side wall 12b is located is in a range of 0 to 0.85. Specifically, as shown in FIG9 , the distance between any position of the adhesive 30 close to the edge of the second side wall 12b of the battery cell 10 and the plane where the second side wall 12b of the battery cell 10 is located is A1, and the distance between the geometric center of the first surface 11 and the plane where the edge of the adhesive 30 away from the second side wall 12b is A2, where 0 <A1 / A2<17 / 20。

[0058] In this embodiment, the ratio of the distance from the geometric center of the adhesive 30 to the adjacent sidewall to the geometric center of the cell 10 surface is set between 0 and 0.85 to ensure that the adhesive 30 is positioned away from the geometric center of the cell 10 surface. This ensures that sufficient expansion space is reserved in the central area of ​​the cell 10 surface. This also ensures that there is sufficient adhesive 30 on the first surface 11 to ensure bonding strength between the top cell 10 and the bottom cell 10, thereby improving the overall reliability of the battery assembly 100.

[0059] In one embodiment disclosed herein, as shown in Figures 6-9 , there are at least two adhesive members 30, spaced apart along the length of the battery assembly 100. Each adhesive member 30 extends at a predetermined angle with the support member 20, with the predetermined angle being between 0° and 90°. This embodiment, by providing at least two adhesive members 30, ensures the bonding strength between two adjacent battery cells 10, thereby improving the stability and safety of the battery assembly 100. Furthermore, maintaining the predetermined angle between 0° and 90° also ensures sufficient expansion space in the clearance area 111 on the first surface 11 of the battery cell 10. Furthermore, by defining the relationship between the extension direction of the adhesive member 30 and the extension direction of the support member 20, the required position or orientation of the adhesive member 30 during attachment is ensured, thereby ensuring the bonding strength of the adhesive member 30.

[0060] Furthermore, as shown in Figures 5-9, the projections of the support member 20 and the adhesive member 30 on the first surface 11 are both rectangular, and the extension direction of the support member 20 is perpendicular to the extension direction of the adhesive member 30. Selecting a rectangular adhesive member 30 can expand the bonding area of ​​the adhesive member 30 and ensure uniform bonding strength at any position of the adhesive member 30, thereby improving the safety and stability of the battery assembly 100.

[0061] In one embodiment disclosed in the present application, a ratio of a projection area of ​​the support member 20 on the first surface 11 to an area of ​​the first surface 11 is between 0.1% and 10%.

[0062] In this embodiment, the ratio of the projection area of ​​the support member 20 on the first surface 11 to the area of ​​the first surface 11 is set between 0.1% and 10%, so as to ensure the supporting effect of the support member 20 and the reliability of the reserved expansion space.

[0063] In other embodiments disclosed in the present application, if multiple support members 20 are provided on the first surface 11 , the ratio of the sum of the projected areas of the multiple support members 20 on the first surface 11 to the area of ​​the first surface 11 is between 0.1% and 10%.

[0064] In one embodiment disclosed in the present application, a ratio of a projection area of ​​the adhesive member 30 on the first surface 11 to an area of ​​the first surface 11 is between 20% and 70%.

[0065] In this embodiment, the ratio of the projected area of ​​the adhesive 30 on the first surface 11 to the area of ​​the first surface 11 is set between 20% and 70%, so as to ensure the bonding effect of the adhesive 30, ensure that sufficient expansion space is reserved on the first surface 11, and ensure the reliability of the reserved expansion space.

[0066] In other embodiments disclosed in the present application, if multiple adhesives 30 are provided on the first surface 11 , the ratio of the sum of the projected areas of the multiple adhesives 30 on the first surface 11 to the area of ​​the first surface 11 is between 20% and 70%.

[0067] In one embodiment disclosed in the present application, the projected area of ​​the support member 20 on the first surface 11 is smaller than the projected area of ​​the adhesive member 30 on the first surface 11. In this embodiment, by jointly limiting the area ratio of the adhesive member 30 and the support member 20, on the one hand, the projected area of ​​the adhesive member 30 on the first surface 11 is made larger than the projected area of ​​the support member 20 on the first surface 11, thereby ensuring that the adhesive force of the adhesive member 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 between two adjacent battery cells 10 and preventing separation between two adjacent battery cells 10. On the other hand, it is avoided that the area occupied by the adhesive member 30 on the first surface 11 is too large, resulting in too little reserved expansion space provided, affecting the heat dissipation effect and increasing costs.

[0068] Furthermore, the ratio of the projection area of ​​the support member 20 on the first surface 11 to the area of ​​the first surface 11 is between 0.1% and 10%, and the ratio of the projection area of ​​the adhesive member 30 on the first surface 11 to the area of ​​the first surface 11 is between 20% and 70%.

[0069] In one embodiment disclosed in the present application, the geometric center of the first surface 11 is located within the avoidance zone 111. Specifically, since the surface of the battery cell 10 expands to present a parabolic shape, that is, the expansion degree of the center of the first surface 11 is greater than that of the surrounding area, locating the geometric center of the first surface 11 within the avoidance zone 111 can ensure that sufficient expansion space is reserved in the central area, reduce the occurrence of lithium deposition inside the battery cell 10, and improve the safety of the battery cell 10.

[0070] In one embodiment disclosed herein, as shown in FIG8 , the battery assembly 100 further includes a filler 40 disposed between two adjacent battery cells 10 and on the first surface 11. The battery cells 10 further include a third sidewall 12c disposed opposite the first sidewall 12a along the width of the battery assembly 100, with the filler 40 disposed adjacent to the third sidewall 12c. It will be appreciated that in this embodiment, the filler 40 can cooperate with the support member 20 to support the stacked battery cells 10, thereby defining the spacing height between the two adjacent battery cells 10 and enhancing support stability. Furthermore, since the filler 40 is closer to the second sidewall 12b than the first sidewall 12a, sufficient expansion space is provided in the center of the first surface 11 of the battery cells 10. Furthermore, since the filler 40 has a certain viscosity, it can also assist the adhesive member 3030 in limiting relative displacement between the two adjacent battery cells 10.

[0071] Furthermore, the distance from the edge of the filling glue 40 adjacent to the third side wall 12c to the third side wall 12c is smaller than the distance from the edge of the filling glue 40 close to the avoidance area 111 to the geometric center of the first surface 11, so as 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.

[0072] 10 , the present application further provides a battery pack 202, which includes the aforementioned battery assembly 100. Specifically, the battery pack 202 includes a tray and a sealing cover, which together enclose a receiving cavity, and the battery assembly 100 is located in the receiving cavity.

[0073] In addition, the present application also provides an electric power system, which includes the above-mentioned battery assembly 100 or the above-mentioned battery pack 202. Specifically, the electric power system can be a vehicle 200 or an energy storage system.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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 surfaces facing each other between two adjacent battery cells (10) in the vertical direction are first surfaces (11), and the first surfaces (11) are further provided with an avoidance area (111); 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 the support member (20) and the adhesive member (30) are arranged at the edge of the avoidance area (111); Each of the battery cells (10) comprises a first side wall (12a) located on the same side of the battery assembly (100) in a horizontal direction, the first side wall (12a) is connected to the first surface (11), the pole (13) of the battery cell (10) is arranged on the first side wall (12a), and the support member (20) is arranged adjacent to the first side wall (12a).

2. The battery assembly (100) according to claim 1, characterized in that: The battery core (10) further comprises a second side wall (12b), wherein the second side wall (12b) is connected to both the first side wall (12a) and the first surface (11); and the adhesive component (30) is arranged adjacent to the second side wall (12b).

3. The battery assembly (100) according to claim 1 or 2, characterized in that: The distance from any position of the edge of the support member (20) close to the first side wall (12a) to the plane where the first side wall (12a) is located is smaller than the distance from the geometric center of the first surface (11) to the plane where the edge of the support member (20) away from the first side wall (12a) is located; And / or, the distance from any position of the edge of the adhesive (30) close to the second side wall (12b) of the battery cell (10) to the plane where the second side wall (12b) of the battery cell (10) is located is smaller than the distance from the geometric center of the first surface (11) to the plane where the edge of the adhesive (30) away from the second side wall (12b) is located.

4. The battery assembly (100) according to any one of claims 1 to 3, characterized in that: The ratio of the distance from any position of the edge of the support member (20) close to the first side wall (12a) to the plane where the first side wall (12a) is located to the distance from the geometric center of the first surface (11) to the plane where the edge of the support member (20) away from the first side wall (12a) is located is in the range of 0 to 0.

8.

5. The battery assembly (100) according to any one of claims 1 to 4, characterized in that: The ratio of the distance from any position of the edge of the adhesive (30) close to the second side wall (12b) of the battery cell (10) to the plane where the second side wall (12b) of the battery cell (10) is located to the distance from the geometric center of the first surface (11) to the plane where the edge of the adhesive (30) away from the second side wall (12b) is located is in a range of 0 to 0.

85.

6. The battery assembly (100) according to any one of claims 1 to 5, characterized in that: The number of the adhesive members (30) is at least two, and at least two of the adhesive members (30) are arranged at intervals along the length direction of the battery assembly (100), and a preset angle is provided between the extension direction of each adhesive member (30) and the extension direction of the support member (20), and the preset angle is between 0° and 90°.

7. The battery assembly (100) according to any one of claims 1 to 6, characterized in that: The projections of the support member (20) and the adhesive member (30) on the first surface (11) are both rectangular, and the extension direction of the support member (20) is perpendicular to the extension direction of the adhesive member (30).

8. The battery assembly (100) according to any one of claims 1 to 7, characterized in that: The support member (20) extends along the length direction of the battery assembly (100) or the width direction of the battery assembly (100) and is located between two adjacent poles (13), wherein the length direction of the battery assembly (100) and the width direction of the battery assembly (100) are both perpendicular to the vertical direction.

9. The battery assembly (100) according to any one of claims 1 to 8, characterized in that: A plurality of the support members (20) are provided, and the support members (20) are arranged at intervals along the length direction of the battery assembly (100) or along the width direction of the battery assembly (100).

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

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

12. The battery assembly (100) according to any one of claims 1 to 11, characterized in that: The projection area of ​​the support member (20) on the first surface (11) is smaller than the projection area of ​​the adhesive member (30) on the first surface (11).

13. The battery assembly (100) according to any one of claims 1 to 12, characterized in that: The geometric center of the first surface (11) is located in the avoidance area (111).

14. The battery assembly (100) according to any one of claims 1 to 13, 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) and is located on the first surface (11); the battery cell (10) further comprises a third side wall (12c), wherein the third side wall (12c) and the first side wall (12a) are arranged opposite to each other along the width direction of the battery assembly (100), and the filling glue (40) is arranged adjacent to the third side wall (12c).

15. The battery assembly (100) according to claim 14, characterized in that: The distance from the edge of the filling glue (40) adjacent to the third side wall (12c) to the third side wall (12c) is smaller than the distance from the geometric center of the first surface (11) to the edge of the filling glue (40) close to the geometric center of the avoidance area (111).

16. A battery pack (202), characterized in that: Comprising the battery assembly (100) according to any one of claims 1 to 15.

17. An electricity system, characterized in that: It comprises the battery pack (202) as claimed in claim 16, or the battery assembly (100) as claimed in any one of claims 1 to 15.

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