Battery module and battery pack

Abstract

The utility model relates to a battery module and a battery pack, and the battery module comprises a battery cell module which comprises a control assembly and a plurality of battery cells; the box body comprises an upper cover, a frame, a bottom plate and a first reinforcing plate, the frame is located between the bottom plate and the upper cover, the control assembly is located on the side face, away from the frame, of the upper cover, and the multiple battery cells are located between the frame and the upper cover; the first reinforcing plate is positioned on the side surface, far away from the battery cells, of the bottom plate, and is opposite to the control assembly. According to the utility model, the problem of stress concentration of the supporting area of the control assembly easily caused after the box body is thinned is solved, the failure risk of related area components is reduced, and the stability of the box body structure is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery module and a battery pack. Background Art

[0002] With the continuous development of power battery technology, the energy density of power battery systems is getting higher and higher, which means that the energy per unit mass of the battery is constantly increasing. Since the energy density of single cells has reached its limit and there is no room for improvement, if we want to continue to improve the energy density of power battery systems, we need a system-level lightweight envelope design to reduce the overall weight of the system.

[0003] In the related art, the overall weight of the system is reduced by thinning the box, lightweighting the box material, or reducing the number of internal structural components to achieve the purpose of improving the energy density of the power battery system. However, the battery system structure made by these weight reduction methods has stress concentration, the rigidity of the battery envelope is not enough, and there is a risk of failure of the box under key working conditions. How to further optimize the structure of the power battery system while ensuring lightweight needs to be solved urgently. Utility Model Content

[0004] In view of this, the utility model proposes a battery module and a battery pack to solve the stress concentration in the battery circuit breaker unit and the battery management system support area that is easily caused by thinning the box body, reduce the failure risk of components in related areas, and further improve the stability of the box body structure.

[0005] In a first aspect, an embodiment of the utility model provides a battery module, comprising: a battery cell module, comprising a control component and a plurality of battery cells; a box body, comprising an upper cover, a frame, a bottom plate and a first reinforcement plate, wherein: the frame is located between the bottom plate and the upper cover, the control component is located on the side of the upper cover away from the frame, and the plurality of battery cells are located between the frame and the upper cover; the first reinforcement plate is located on the side of the bottom plate away from the plurality of battery cells, and is arranged opposite to the control component.

[0006] In a second aspect, an embodiment of the present invention provides a battery pack, which includes the battery module.

[0007] By arranging the first reinforcement plate on the side of the bottom plate away from the multiple battery cells, and arranging the first reinforcement plate relative to the control component of the battery cell module, according to various aspects of the utility model, the stress concentration in the control component support area that is easily caused by thinning the box body is solved, the failure risk of components in related areas is reduced, and the stability of the box body structure is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The technical solutions and other beneficial effects of the present invention will be made apparent by describing in detail the specific embodiments of the present invention in conjunction with the accompanying drawings.

[0009] Figure 1 A schematic diagram of the exploded structure of a box body according to an embodiment of the utility model is shown.

[0010] Figure 2 A schematic top view of the structure of the first reinforcement plate of an embodiment of the utility model is shown.

[0011] Figure 3 A schematic top view of the structure of the second reinforcement plate of an embodiment of the utility model is shown.

[0012] Figure 4 A schematic structural diagram of a reinforcement portion of an embodiment of the utility model is shown.

[0013] Figure 5 A schematic structural diagram of a framework of an embodiment of the utility model is shown.

[0014] Figure 6 A schematic diagram showing an assembled box body of an embodiment of the utility model is shown.

[0015] Reference numerals:

[0016] 11. First reinforcing plate; 12. Bottom plate; 13. Frame; 14. Upper cover; 15. Top cover; 130. Harness area; 111. First boss; 112. Second boss; 113. Third boss; 114. Groove; 120. Bottom plate hole; 121. First bottom edge; 122. Second bottom edge; 115. First reinforcing plate; 116. Second reinforcing plate; 117. Harness opening; 118. Second reinforcing plate ; 211, third reinforcing plate; 141, side of upper cover; 142, flange; 143, junction of side of upper cover and flange; 23, reinforcing portion; 231, convex point; 232, surrounding portion; 131, first longitudinal beam; 132, second longitudinal beam; 133, third longitudinal beam; 1331, straight longitudinal beam; 1332, vertical longitudinal beam; 134, first horizontal beam; 135, second horizontal beam; 136, grid-like space. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0018] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, 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 utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly defined, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] The disclosure below provides many different embodiments or examples for realizing different structures of the utility model. In order to simplify the disclosure of the utility model, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the utility model. In addition, the utility model can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, and does not indicate the relationship between the various embodiments and / or settings discussed in itself. In addition, the utility model provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials. In some instances, methods, means, components and circuits well known to those skilled in the art are not described in detail, so as to highlight the main purpose of the utility model.

[0021] The utility model provides a battery module, the battery module comprising: a battery cell module and a box. The battery cell module may include a control component and a plurality of battery cells arranged in rows and columns, and the box may be used to accommodate and support the battery cell module. Optionally, the control component includes a battery disconnect unit (BDU) and a battery management system (BMS).

[0022] Figure 1 The exploded structure diagram of the box body of the utility model embodiment is shown. Figure 1 As shown, the box body includes an upper cover 14, a frame 13, a bottom plate 12 and a first reinforcing plate 11. The box body may also include a top cover 15, which is located on the side of the upper cover 14 away from the frame 13.

[0023] In one embodiment, the frame 13 is located between the bottom plate 12 and the upper cover 14, and the control assembly is located on the side of the upper cover 14 away from the frame 13. Figure 1 As shown, the bottom plate 12 is attached to the lower side of the frame 13. The frame 13 has Figure 1 In the wiring harness area 130 shown, the control assembly is arranged opposite to the wiring harness area 130. The orthographic projections of the control assembly and the wiring harness area 130 on the bottom plate 12 may partially or completely overlap.

[0024] In one embodiment, the plurality of cells are located between the frame 13 and the upper cover 14, and are arranged in parallel in the space enclosed by the frame 13. The first reinforcing plate 11 is located on the side of the bottom plate 12 away from the plurality of cells, and is disposed opposite to the control assembly. Figure 1 The first reinforcing plate 11 is located at the lower side of the bottom plate 12, the bottom plate 12 is located on the first reinforcing plate 11, and the position of the first reinforcing plate 11 is also arranged opposite to the wiring harness area 130. The upper cover 14 can be integrated with the components that support or dock the control assembly through the first reinforcing plate 11.

[0025] The first reinforcing plate 11 and the control assembly are arranged relative to each other, which means that the orthographic projection of the first reinforcing plate 11 on the bottom plate 12 partially or completely overlaps with the orthographic projection of the control assembly on the bottom plate 12. In some embodiments, the control assembly may be arranged directly above the first reinforcing plate 11.

[0026] It is worth noting that in Figure 1In the embodiment, the length direction of the first reinforcing plate 11 is the first direction, i.e., the x direction; the width direction of the first reinforcing plate 11 is the second direction, i.e., the y direction; and the height direction of the first reinforcing plate 11 is the third direction, i.e., the z direction. Figure 1 Description of the direction.

[0027] By arranging the first reinforcement plate on the side of the bottom plate away from the multiple battery cells, and arranging the first reinforcement plate relative to the control component of the battery cell module, the embodiment of the utility model can solve the stress concentration in the control component support area that is easily caused after the box body is thinned, reduce the failure risk of components in related areas, and further improve the stability of the box body structure.

[0028] Figure 2 A schematic diagram of the top view of the first reinforcing plate of an embodiment of the utility model is shown. A-A' is a section line along the first direction. In one embodiment, the first reinforcing plate 11 includes: at least one boss, at least one boss is located on the surface of the first reinforcing plate 11 facing the bottom plate 12 to support the control component. The support of the boss can improve the strength and disperse stress of the area near the control component in the battery pack.

[0029] by Figure 2 For example, the first reinforcement plate 11 includes a first boss 111, a second boss 112 and a third boss 113. The first boss 111 and the second boss 112 are arranged at the edge of the first reinforcement plate 11 along the first direction, and both extend along the second direction. The first boss 111 and the second boss 112 are arranged opposite to the battery disconnecting unit. The orthographic projections of the first boss 111 and the second boss 112 on the bottom plate 12 may partially or completely overlap with the orthographic projections of the battery disconnecting unit on the bottom plate 12.

[0030] The third boss 113 extends along the first direction and is spaced apart from the first boss 111 and the second boss 112. The third boss 113 is disposed opposite to the battery management system. The orthographic projection of the third boss 113 on the bottom plate 12 may partially or completely overlap with the orthographic projection of the battery management system on the bottom plate 12.

[0031] In one embodiment, the bottom plate 12 includes a first bottom edge 121 and a second bottom edge 122 that are oppositely disposed, the first boss 111 abuts against the first bottom edge 121 of the bottom plate 12, and the second boss 112 abuts against the second bottom plate 12 of the bottom plate 12. Both ends of the third boss 113 may be flush with the first boss 111 and the second boss 112, respectively. Figure 2The left end of the third boss 113 may be flush with the outer edge of the first boss 111 toward the first bottom side 121 along the first direction, and the right end of the third boss 113 may be flush with the outer edge of the second boss 112 toward the second bottom side 122 along the first direction.

[0032] In some embodiments, the first boss 111, the second boss 112 and the third boss 113 can be used together to support the battery disconnect unit and the battery management system. Of course, in practical applications, other numbers of bosses can also be used to support the battery disconnect unit and the battery management system, and the present invention is not limited to this.

[0033] In one embodiment, the first reinforcing plate 11 further includes: at least one bent groove 114, the groove 114 being arranged opposite to the cooling components of the plurality of battery cells. The orthographic projections of the groove 114 and the cooling components of the plurality of battery cells on the bottom plate 12 may partially or completely overlap. Figure 2 As shown, the groove 114 may be a U-shaped groove. A cooling assembly may be provided on the side of the plurality of battery cells, and a coolant flows in the cooling assembly to dissipate heat from the plurality of battery cells. The cooling assembly may be a whole surface shape upright along the third direction, and the bottom surface of the cooling assembly is embedded in the groove 114.

[0034] In one embodiment, a wiring harness opening 117 is further provided on the bottom plate 12 of the box body, and the wiring harness opening 117 allows multiple wiring harnesses to pass through. The wiring harnesses can be electrically connected to a control component including the battery circuit breaker unit and the battery management system, and are used to transmit electrical signals of the control component, such as power supply, communication, control and other signals.

[0035] In one embodiment, the side of the bottom plate 12 away from the battery module is further provided with a first reinforcing plate 115 and a second reinforcing plate 116, and the first reinforcing plate 115 and the second reinforcing plate 116 can be connected to the first reinforcing plate 11. The first reinforcing plate 115 is provided on a side close to the first bottom plate 12, and is located on the side of the groove 114 away from the third boss 113. The second reinforcing plate 116 is provided on the side of the harness opening away from the third boss 113, and partially overlaps with the harness opening along the second direction. The first reinforcing plate 115 can be used to support the bracket of the battery disconnecting unit, and the second reinforcing plate 116 can be used to support the bracket of the battery management system.

[0036] In one embodiment, the battery module further includes: a second reinforcing plate 118, which is located on the surface of the bottom plate 12 close to the battery module and is provided at the wiring harness opening 117. Since the second reinforcing plate 118 is located on the side of the bottom plate 12 close to the battery module, and the first reinforcing plate 11 is located on the side of the bottom plate 12 away from the battery module, the second reinforcing plate 118 can also be called an inner reinforcing plate, and the first reinforcing plate 11 can also be called an outer reinforcing plate. By adding an inner reinforcing plate on the side of the bottom plate 12 close to the battery module, the stress concentration in the relevant area when the box is mechanically loaded can be further dispersed, and the stability of the box structure can be further enhanced.

[0037] Figure 3 FIG. 2 is a schematic diagram showing a top view of the second reinforcing plate of an embodiment of the utility model. Figure 3 As shown, BB' is a section line along the first direction, and the second reinforcing plate 118 is arranged around the harness opening 117 of the bottom plate 12. The second reinforcing plate 118 includes a hollow hole, and the shape of the hollow hole is consistent with the shape of the harness opening. In order not to affect the edge of the harness opening 117, the edge of the hollow hole should be at least 1.5 mm away from the edge of the harness opening 117.

[0038] In one embodiment, a third reinforcing plate 211 is further provided on the side of the bottom plate 12 close to the battery module. The third reinforcing plate 211 is partially arranged opposite to the first reinforcing plate 115 and is arranged adjacent to the hole 120 on the bottom plate 12. Since there are many holes 120 on the bottom plate 12 in the box, the support of the box is still insufficient after the battery disconnecting unit and the battery management system are placed, and there is a risk of deformation of the box during shock impact. Therefore, the third reinforcing plate 211 is arranged adjacent to the hole 120 on the bottom plate 12, which can further strengthen the structural strength of the box and reduce the risk of deformation of the box during shock impact.

[0039] In one embodiment, the reinforcing plate or the reinforcing plate of the utility model can be made of the same material as the box body. Optionally, the box body, the first reinforcing plate 11, the second reinforcing plate 118, the first reinforcing plate 115, the second reinforcing plate 116 and the third reinforcing plate 211 are all made of carbon fiber material to achieve a lightweight design of the box body.

[0040] Figure 4 The structural schematic diagram of the reinforcement part of the embodiment of the utility model is shown. Figure 4As shown, the upper cover 14 includes a side 141 and a flange 142 connected to the side, the flange 142 is arranged in parallel along the second direction, and the angle between the side 141 and the flange 142 is an obtuse angle. A plurality of mutually spaced reinforcing parts 23 are provided at the joint 143 between the side 141 and the flange 142 of the upper cover 14. By providing a plurality of reinforcing parts 23 on the flange of the box body, the battery disconnecting unit and the battery management system can be further supported, and the structural stability of the box body can be enhanced.

[0041] See also Figure 4 The reinforcing portion 23 includes a protruding point 231 in the middle and a surrounding portion 232 surrounding the protruding point 231. The protruding point 231 protrudes to the outside of the box body, and the surrounding portion 232 may include a plurality of arc portions with different arcs, so that the connection between the reinforcing portion 23 and the joint 143 can be smoother, and the arc of the arc portion can be adjusted according to the structural adaptability of the battery disconnect unit and the battery management system, so that the overall structure of the box body is more stable.

[0042] Figure 5 The schematic diagram of the structure of the frame of the embodiment of the utility model is shown. In one embodiment, the frame 13 includes at least two cross beams and at least two longitudinal beams, and the cross beams and the longitudinal beams are arranged in an alternating manner. Figure 5 As shown, the frame 13 includes a first cross beam 134 and a second cross beam 135, and the frame 13 also includes a first longitudinal beam 131, a second longitudinal beam 132 and a third longitudinal beam 133. The first longitudinal beam 131 and the second longitudinal beam 132 are relatively arranged on the side of the frame 13, and the third longitudinal beam 133 is arranged between the first longitudinal beam 131 and the second longitudinal beam 132. The third longitudinal beam 133 includes a straight longitudinal beam 1331 and a vertical longitudinal beam 1332. The straight longitudinal beam 1331 extends along the second direction and is parallel to the plane formed by the first direction and the second direction; the vertical longitudinal beam 1332 extends along the third direction. The widths of the first longitudinal beam 131, the second longitudinal beam 132 and the straight longitudinal beam 1331 along the first direction may be equal. Preferably, the widths of the first longitudinal beam 131, the second longitudinal beam 132 and the straight longitudinal beam 1331 are between 82.8 mm and 83.2 mm. By optimizing the width of the longitudinal beam in the lower box body, the weight increased by the reinforcement plate design can be further compensated and the total weight of the battery pack can be reduced.

[0043] Furthermore, the plurality of transverse beams and the plurality of longitudinal beams are staggered to form a plurality of grid-like spaces 136, and the grid-like spaces 136 are coated with hard polyurethane and structural adhesive. Figure 5, the cross beam and the longitudinal beam form 6 grid spaces 136, and each of the grid spaces 136 can be coated with hard polyurethane and structural adhesive. Generally speaking, the larger the glue coating area, the better, but the utility model can neutralize the increased weight of the reinforcement plate by narrowing the width of the first longitudinal beam 131, the second longitudinal beam 132 and the straight longitudinal beam 1331 to reduce the weight of the entire battery pack. In addition, by coating the grid space 136 with hard polyurethane and structural adhesive and replacing the buffer material at the bottom of the box, it is possible to replace the strap glue foam solution in the related art, increase the glue coating area with the module and the lower box, enhance the buffering capacity, and increase the overall rigidity of the box.

[0044] It should be noted that the reinforcing plate of the present invention can be a type-adaptive reinforcing plate. The meaning of "type-adaptive" is that the specific structure of the reinforcing plate can be adaptively adjusted according to the actual structure of the box. Therefore, based on the reinforcing plate structure of the present invention, the relevant structure of the reinforcing plate can be adaptively adjusted, and the present invention does not limit this.

[0045] Figure 6 The schematic diagram of the box body after assembly of the utility model embodiment is shown. Figure 6 As shown, after the box is assembled, the first reinforcement plate 11 is exposed outside the box and is an external reinforcement plate; the second reinforcement plate 118 is located inside the wiring harness opening 117 and is an internal reinforcement plate. The battery circuit unit and the battery management system are located on the side of the box.

[0046] In addition, the utility model further provides a battery pack, the battery pack comprising the battery module. It is understood that the utility model does not limit other components of the battery pack.

[0047] In summary, compared with the solution of improving the energy density of the battery pack system by optimizing the energy density of single cells in the related art, the embodiment of the utility model can enhance the timeliness and economy of the mechanical strength of the box while designing a lightweight battery pack system, especially for the design of the battery circuit breaker unit and the battery management system external battery pack cover. After the box is thinned, it is easy to cause stress concentration in the supporting area of ​​the battery circuit breaker unit and the battery management system, and the corresponding failure risk of the lower box, cold plate, mounting point and other components increases. Increasing the structural strength through local reinforcement can guide the conduction of force. Through the reinforcement design of the local structure, it is possible to carry out targeted strength optimization of the risk points of failure in key working conditions while ensuring lightweight, improve the stress concentration phenomenon, and increase the overall battery envelope stiffness.

[0048] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0049] The battery module and battery pack provided in the embodiments of the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the technical solution and core idea of ​​the present invention. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery module, characterized in that: include: A battery cell module, including a control component and a plurality of battery cells; The box body comprises an upper cover (14), a frame (13), a bottom plate (12) and a first reinforcing plate (11), wherein: The frame (13) is located between the bottom plate (12) and the upper cover (14), the control component is located on a side of the upper cover (14) away from the frame (13), and the plurality of battery cells are located between the frame (13) and the upper cover (14); The first reinforcing plate (11) is located on a side of the bottom plate (12) away from the plurality of battery cells, and is arranged opposite to the control component.

2. The battery module according to claim 1, characterized in that: The first reinforcing plate (11) comprises: At least one boss, at least one boss is located on the surface of the first reinforcing plate (11) facing the bottom plate (12) to support the control component.

3. The battery module according to claim 2, characterized in that: The control assembly includes a battery disconnect unit and a battery management system, and the first reinforcement plate (11) includes: A first boss (111); a second boss (112), wherein the first boss (111) and the second boss (112) are arranged opposite to each other at the edge of the first reinforcing plate (11) along a first direction and both extend along a second direction, and the first boss (111) and the second boss (112) are arranged opposite to the battery disconnecting unit; A third boss (113), the third boss (113) extends along the first direction and is spaced apart from the first boss (111) and the second boss (112), and the third boss (113) is arranged opposite to the battery management system.

4. The battery module according to claim 1, characterized in that: The first reinforcing plate (11) further comprises: At least one groove (114), wherein the groove (114) is arranged opposite to the cooling components of the plurality of battery cells.

5. The battery module according to claim 1, characterized in that: The bottom plate (12) is provided with a wiring harness opening (117), and the battery module further comprises: a second reinforcement plate (118), the second reinforcement plate (118) is located on the surface of the bottom plate (12) close to the battery cell module and is provided at the wiring harness opening (117).

6. The battery module according to claim 1, characterized in that: The side of the upper cover (14) is connected to a flange (142), and a plurality of mutually spaced reinforcing parts (23) are provided at a joint (143) between the side (141) of the upper cover (14) and the flange (142).

7. The battery module according to claim 6, characterized in that: The reinforcing portion (23) comprises a convex point (231) located in the middle and a surrounding portion (232) surrounding the convex point (231); the convex point (231) protrudes toward the outside of the box body; and the surrounding portion (232) comprises a plurality of arc portions with different arcs.

8. The battery module according to any one of claims 1 to 7, characterized in that: The frame (13) comprises at least two transverse beams and at least two longitudinal beams, wherein the transverse beams and the longitudinal beams are arranged in a staggered manner, wherein the width of the longitudinal beams located at the side is between 82.8 mm and 83.2 mm.

9. The battery module according to claim 8, characterized in that: The plurality of transverse beams and the plurality of longitudinal beams are staggered to form a plurality of lattice spaces (136), and the lattice spaces (136) are coated with hard polyurethane and structural adhesive.

10. A battery pack, characterized in that: The battery pack comprises a battery module as described in any one of claims 1 to 9.

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