Battery assembly fixing structure, battery module and energy storage device
By adopting alternately arranged fixed plate structure and hollow area design in the battery module, the problem of uneven expansion constraints of the battery module is solved, and more effective battery module fixation and safety improvement are achieved.
Patent Information
- Application Number
- CN202422138917.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-30
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-08-30
AI Technical Summary
When existing battery modules generate heat and expand during the charge and discharge cycle, the steel belt restraint ability is limited, resulting in poor suppression of expansion of the battery cell and it is difficult to ensure the consistent binding force at different positions.
The co-locking structure of two first fixing plates and two second fixing plates is adopted, and the expansion of the battery assembly is restricted by alternate arrangement and fixed connection, combined with the hollow zone design to reduce weight and provide balanced binding force.
It improves the constraint effect of battery module expansion, ensures the balanced constraint force at different positions, reduces the weight of the fixed structure, and improves the energy density and safety of the battery module.
Smart Images
Figure CN223140932U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of batteries, and particularly relates to a battery component fixing structure, a battery module and an energy storage device. Background Art
[0002] In fields such as electric vehicles and energy storage systems, the battery module, as the core component for energy storage and supply, is of crucial performance and safety. With the continuous development of battery technology, especially the increasingly wide application of high-energy density batteries, the battery module will inevitably generate heat and expand to a certain extent during charge and discharge cycles. In order to address the expansion problem of the battery module, the battery modules on the market generally adopt the method of using aluminum end plates and steel belts to restrain the expansion of the battery cells. However, due to the limited restraining ability of the steel belts and the difficulty in ensuring consistent restraint force on different positions of the battery cells, the effect of restraining the expansion of the battery cells is not good. Summary of the Utility Model
[0003] To solve the above technical problems, the present application provides a battery component fixing structure, a battery module and an energy storage device.
[0004] In the first aspect of the present application, a battery component fixing structure is provided for fixing a battery component. The battery component includes at least one battery cell group, and the battery cell group includes a plurality of battery cells arranged along a first direction. The battery component further includes two first surfaces oppositely arranged along the first direction and two second surfaces oppositely arranged along a second direction, and the second direction is perpendicular to the first direction. The battery component fixing structure includes two first fixing plates and two second fixing plates. The two first fixing plates are respectively used for being attached to the two first surfaces of the battery component, and the two second fixing plates are respectively used for being attached to the two second surfaces of the battery component. The second fixing plates and the first fixing plates are arranged alternately along the surrounding direction around the battery component. Each second fixing plate is fixedly connected to two adjacent first fixing plates. The two first fixing plates are used for clamping the battery component along the first direction, and the two second fixing plates are used for clamping the battery component along the second direction.
[0005] Wherein, the second fixing plate includes a second fixing plate main body and a connecting portion. The second fixing plate main body is fixedly connected to two adjacent first fixing plates. The second fixing plate main body is provided with a hollow area, and the hollow area penetrates through the second fixing plate main body along the second direction. The connecting portion protrudes from the edge of the hollow area in a direction away from the other second fixing plate and protrudes from the second fixing plate main body, and the connecting portion is used for connecting with a housing for accommodating the battery component.
[0006] In the second aspect of the present application, a battery module is provided. The battery module includes a battery component and the battery component fixing structure provided in the first aspect above.
[0007] In a third aspect of the present application, an energy storage device is provided, and the energy storage device includes the battery module provided in the second aspect above.
[0008] The battery component fixing structure, the battery module, and the energy storage device provided in the present application form a cooperative locking structure by fixedly connecting the two first fixing plates and the two second fixing plates. When the battery component expands, the movement of the two first fixing plates and the two second fixing plates will be restricted, thereby ensuring the binding force on the battery component and further improving the restraint effect on the expansion of the battery component. Moreover, by arranging the two first fixing plates to be respectively attached to the two first surfaces of the battery component, and the two second fixing plates to be respectively attached to the two second surfaces of the battery component, the first fixing plate can provide a more balanced binding force to different positions on the first surface of the battery component, and the second fixing plate can provide a more balanced binding force to different positions on the second surface of the battery module. In addition, the second fixing plate is provided with the hollow area, so that both the restraint effect of the battery component fixing structure can be ensured and the weight of the battery component fixing structure can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] In order to more clearly illustrate the technical solutions of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0010] Figure 1 It is a schematic structural diagram of a battery module provided in an embodiment of the present application.
[0011] Figure 2 For Figure 1 the exploded structural diagram of the battery module shown.
[0012] Figure 3 For Figure 1 the schematic structural diagram of the battery component fixing structure shown.
[0013] Figure 4 For Figure 3 the schematic structural diagram of the second fixing plate shown at an angle.
[0014] Figure 5 For Figure 3 the schematic structural diagram of the second fixing plate shown at another angle.
[0015] Figure 6 For Figure 2 the schematic structural diagram of the battery component shown.
[0016] Figure 7 It is a schematic side view of the battery module and the battery module fixing structure along the side perpendicular to the first direction.
[0017] Figure 8 It is Figure 3 a schematic view of the first fixing plate shown at an angle.
[0018] Figure 9 It is Figure 3 a schematic view of the first fixing plate shown at another angle.
[0019] Figure 10 It is a schematic side view of the battery module and the battery module fixing structure along the side parallel to the first direction.
[0020] Description of the reference numerals:
[0021] 3 - battery module; 2 - battery module; 1 - battery module fixing structure; 21 - battery cell group; 211 - battery cell; 22 - first surface; 23 - second surface; 11 - first fixing plate; 12 - second fixing plate; 121 - second fixing plate body; 122 - connecting portion; 121a - hollowed - out area; 4 - first insulating member; 5 - second insulating member; 212 - first side; 213 - second side; 211a - swelling surface; 211b - non - swelling surface; 211c - outer battery cell; 21a - outer battery cell group; 24 - electrode lead - out piece; 123 - avoidance notch; 241 - connecting section; 242 - lead - out section; 24a - positive - pole lead - out piece; 24b - negative - pole lead - out piece; 25 - connecting piece; 1211 - first inner surface; 1212 - first outer surface; 124 - supporting portion; 125 - hanging ear; 126 - reinforcing rib; 1261 - first reinforcing rib; 1262 - second reinforcing rib; 116 - end; 1161 - first mounting hole; 1263 - second mounting hole; 111 - first fixing plate body; 112 - convex portion; 1111 - second inner surface; 1112 - second outer surface; 113 - strengthening portion; 114 - first edge; 115 - second edge; 1221 - connecting hole. Detailed implementation manners
[0022] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.
[0023] In the description of the present application, terms such as "first" and "second" are used to distinguish different objects rather than to describe a specific order. The orientation or positional relationship indicated by terms such as "upper", "lower", "inner", and "outer" is only for the convenience of describing the present application 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 should not be construed as a limitation to the present application.
[0024] In the description of the present application, unless otherwise clearly specified and defined, the term "connection" 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 directly connected, indirectly connected through an intermediate medium, or the communication between two elements; it can be a communication connection; it can be an electrical connection. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to specific circumstances.
[0025] Please refer to Figures 1 to 3 , Figure 1 which is a schematic structural diagram of the battery module 3 provided by an embodiment of the present application, Figure 2 is Figure 1 a schematic exploded view of the battery module 3 shown, Figure 3 is Figure 1 a schematic structural diagram of the battery component fixing structure 1 shown. As Figure 1 and Figure 2 shown, the battery module 3 includes a battery component 2 and a battery component fixing structure 1 for fixing the battery component 2. The battery component 2 includes at least one battery cell group 21. The battery cell group 21 includes a plurality of battery cells 211 arranged along a first direction (such as the X direction shown in Figure 1 and Figure 2 ). The battery component 2 further includes two first surfaces 22 oppositely arranged along the first direction and two second surfaces 23 oppositely arranged along a second direction (such as the Y direction shown in Figure 1 and Figure 2 ). The second direction is perpendicular to the first direction.
[0026] As Figures 1 to 3As shown, the battery module fixing structure 1 includes two first fixing plates 11 and two second fixing plates 12. The two first fixing plates 11 are respectively used to be attached to two first surfaces 22 of the battery module 2, and the two second fixing plates 12 are respectively used to be attached to two second surfaces 23 of the battery module 2. The second fixing plates 12 and the first fixing plates 11 surround the battery module 2 and are alternately arranged along the surrounding direction. Each second fixing plate 12 is fixedly connected to two adjacent first fixing plates 11. The two first fixing plates 11 are used to clamp the battery module 2 along the first direction, and the two second fixing plates 12 are used to clamp the battery module 2 along the second direction.
[0027] Please refer to Figure 3 、 Figure 4 and Figure 5 , Figure 4 which is Figure 3 a schematic structural view of the second fixing plate 12 at an angle as shown, Figure 5 and Figure 3 is a schematic structural view of the second fixing plate 12 at another angle as shown. As Figure 3 、 Figure 4 and Figure 5 shown, the second fixing plate 12 includes a second fixing plate main body 121 and a connecting portion 122. The second fixing plate main body 121 is fixedly connected to two adjacent first fixing plates 11. The second fixing plate main body 121 is provided with a hollow area 121a which penetrates the second fixing plate main body 121 along the second direction. The connecting portion 122 protrudes from the edge of the hollow area 121a in a direction away from another second fixing plate 12 and is used to be connected to a housing for accommodating the battery module 2.
[0028] Wherein, the two first surfaces 22 and the two second surfaces 23 are both outer surfaces.
[0029] By arranging the two first fixing plates 11 to clamp the battery module 2 along the first direction, the two second fixing plates 12 to clamp the battery module 2 along the second direction, and the two first fixing plates 11 and the two second fixing plates 12 being fixedly connected, when the battery module 2 expands, the two first fixing plates 11 and the two second fixing plates 12 restrain each other, preventing the two first fixing plates 11 and the two second fixing plates 12 from moving, ensuring the binding force on the battery module 2, and thus improving the restraint effect on the expansion of the battery module 2. Moreover, by arranging the two first fixing plates 11 to be respectively in contact with the two first surfaces 22 of the battery module 2, and the two second fixing plates 12 to be respectively in contact with the two second surfaces 23 of the battery module 2, the first fixing plates 11 can provide more balanced binding force at different positions on the first surface 22 of the battery module 2, and the second fixing plates 12 can provide more balanced binding force at different positions on the second surface of the battery module. In addition, the second fixing plate 12 is provided with the hollow area 121a, which can not only ensure the restraint effect of the battery module fixing structure 1, but also reduce the weight of the battery module fixing structure 1.
[0030] Wherein, the two first fixing plates 11 and the two second fixing plates 12 can both be made of metal materials. For example, the two first fixing plates 11 and the two second fixing plates 12 can both be sheet metal structures. In some other embodiments, the two first fixing plates 11 and the two second fixing plates 12 can also be made of other materials, such as polymer materials and inorganic non-metallic materials.
[0031] In some embodiments, such as Figure 1 As Figure 2 shown, the battery module 3 can include two first insulating members 4 and two second insulating members 5. Each first insulating member 4 is located between a first fixing plate 11 and a first surface 22, and each first insulating member 4 can cover a corresponding first surface 22. The first insulating member 4 is attached to the first surface 22, and the first fixing plate 11 is attached to the first insulating member 4, so that the first fixing plate 11 is attached to the first surface 22.
[0032] Each second insulating member 5 is located between a second fixing plate 12 and a second surface 23, and each second insulating member 5 can cover a corresponding second surface 23. The second insulating member 5 is attached to the second surface 23, and the second fixing plate 12 is attached to the second insulating member 5, so that the second fixing plate 12 is attached to the second surface 23. The first insulating member 4 and the second insulating member 5 are used to insulate the battery cells 211 from the first fixing plates 11 and the second fixing plates 12 to prevent short circuits.
[0033] In some other embodiments, the outer surface of the housing of the battery cell 211 may be subjected to an insulation treatment so that the first surface 22 and the second surface 23 are insulated. The first fixing plate 11 may be directly attached to the first surface 22, and the second fixing plate 12 may be directly attached to the second surface 23.
[0034] Please refer to Figure 6 , Figure 6 is Figure 2 a schematic structural view of the battery assembly 2 shown. In some embodiments, as Figure 6 shown, each battery cell 211 of the battery cell group 21 includes two opposite expansion surfaces 211a and two opposite non-expansion surfaces 211b. The two expansion surfaces 211a are the two outermost surfaces with the largest area of the battery cell 211. Due to the largest area, the two expansion surfaces 211a are weak areas for resisting acting forces. When the battery cell 211 expands, mainly the two expansion surfaces 211a expand, and the expansion degree of the two non-expansion surfaces 211b is very small or does not expand. Each battery cell group 21 includes two first surfaces 212 oppositely arranged along the first direction and two second surfaces 213 oppositely arranged along the second direction.
[0035] In some embodiments, as Figure 6 shown, the two expansion surfaces 211a of each battery cell 211 are perpendicular to the first direction (such as the X direction shown in Figure 6 ), and the two non-expansion surfaces 211b are perpendicular to the second direction (such as the Y direction shown in Figure 6 ). The non-expansion surfaces 211b of all the battery cells 211 of each battery cell group 21 located on the same side together constitute a second surface 213 of the battery cell group 21, and the non-expansion surfaces 211b located on the same other side together constitute another second surface 213. Each battery cell group 21 includes two outermost battery cells 211c located on the outermost side in the first direction. The expansion surface 211a facing outwards of one of the two outermost battery cells 211c constitutes a first surface 212, and the expansion surface 211a facing outwards of the other outermost battery cell 211c constitutes another first surface 212.
[0036] In some other embodiments, the two swelling surfaces 211a are perpendicular to the second direction, and the two swelling surfaces 211a are perpendicular to the first direction. All the battery cells 211 of each battery cell group 21 located on the swelling surfaces 211a on the same side together constitute a second surface 213 of the battery cell group 21, and the swelling surfaces 211a located on the same other side together constitute another second surface 213. Each battery cell group 21 includes two outermost battery cells 211c in the first direction. The non-swelling surface 211b of one of the two outermost battery cells 211c facing outward constitutes a first surface 212, and the swelling surface 211b of the other outermost battery cell 211c facing outward constitutes another first surface 212.
[0037] In some embodiments, as Figure 1 , Figure 2 and Figure 6 shown, the battery assembly 2 includes at least two battery cell groups 21 arranged along the second direction. As Figure 6 shown, the first surfaces 212 of the at least two battery cell groups 21 located on the same side together constitute a first surface 22, that is, the first surfaces 212 located on the same side together constitute one of the two first surfaces 22, and the first surfaces 212 located on the same other side together constitute the other of the two first surfaces 22.
[0038] As Figure 6 shown, the at least two battery cell groups 21 further include two outermost battery cell groups 21a in the second direction. The second surface 213 of one of the two outermost battery cell groups 21a facing outward constitutes a second surface 23, and the second surface 213 of the other outermost battery cell group 21a facing outward constitutes another second surface 23.
[0039] By arranging the at least two battery cell groups 21 along the second direction, it is possible to restrict the movement of the at least two battery cell groups 21 in the second direction by using the two second fixing plates 12, thereby restricting the battery assembly 2 in the second direction.
[0040] When the two expanding surfaces 211a are perpendicular to the first direction and the two non-expanding surfaces 211b are perpendicular to the second direction, each battery cell group 21 includes two outermost battery cells 211c. Among the outermost battery cells 211c of the at least two battery cell groups 21, the expanding surfaces 211a facing outward of the outermost battery cells 211c on the same side together form a first surface 22, and the expanding surfaces 211a facing outward of the outermost battery cells 211c on the same other side together form another first surface 22. Among the two outermost battery cell groups 21a of the at least two battery cell groups 21, the non-expanding surfaces 211b facing outward of all the battery cells 211 in one outermost battery cell group 21a together form a second surface 23, and the non-expanding surfaces 211b facing outward of all the battery cells 211 in the other outermost battery cell group 21a together form another second surface 23. It can be understood that the first surface 22 is formed by the expanding surfaces 211a, and the second surface 23 is formed by the non-expanding surfaces 211b.
[0041] When the two expanding surfaces 211a are perpendicular to the second direction and the two non-expanding surfaces 211b are perpendicular to the first direction, each battery cell group 21 includes two outermost battery cells 211c. Among the outermost battery cells 211c of the at least two battery cell groups 21, the non-expanding surfaces 211b facing outward of the outermost battery cells 211c on the same side together form a first surface 22, and the non-expanding surfaces 211b facing outward of the outermost battery cells 211c on the same other side together form another first surface 22. Among the two outermost battery cell groups 21a of the at least two battery cell groups 21, the expanding surfaces 211a facing outward of all the battery cells 211 in one outermost battery cell group 21a together form a second surface 23, and the expanding surfaces 211a facing outward of all the battery cells 211 in the other outermost battery cell group 21a together form another second surface 23. It can be understood that the first surface 22 is formed by the non-expanding surfaces 211b, and the second surface 23 is formed by the expanding surfaces 211a.
[0042] In some embodiments, as Figure 1 , Figure 2 and Figure 6 shown, the battery assembly 2 may include two battery cell groups 21, and the two battery cell groups 21 are arranged along the second direction. In other embodiments, the number of the battery cell groups 21 may be other values, such as 3, 4, 6, etc.
[0043] In some embodiments, the battery assembly 2 may include one battery cell group 21, and the two first surfaces 212 of the battery cell group 21 are respectively the two first surfaces 22, and the two second surfaces 213 are respectively the two second surfaces 23.
[0044] In some embodiments, as Figures 3 to 5 shown, the connecting portion 122 and the edge of the hollowed-out area 121a are integrally formed.
[0045] When preparing the second fixing plate 12, a complete second fixing plate blank without a hollow can be prepared first, and then a specific shape is cut out on the second fixing plate blank along a preset open cutting line, and the preset open cutting line defines a part of the contour of the hollow area 121a. Then, part of the material surrounded by the open cutting line is removed at the boundary of the open cutting line, and the remaining material surrounded by the open cutting line is bent in a direction away from the second fixing plate blank, and the connecting part 122 and the hollow area 121a are formed synchronously.
[0046] By setting the connecting part 122 and the edge of the hollow area 121a to be integrally formed, the manufacturing process of the connecting part 122 and the hollow area 121a can be simplified.
[0047] In some other embodiments, the connecting part 122 can be fixedly connected to the edge of the hollow area 121a by connection methods such as screwing, riveting, and clamping.
[0048] In some embodiments, such as Figure 1 , Figure 2 and Figure 6 shown, the battery assembly 2 further includes two electrode lead-out sheets 24, and at least part of the two electrode lead-out sheets 24 is disposed on at least one of the two second surfaces 23, that is, at least part of the two electrode lead-out sheets 24 can be disposed on the same second surface 23, or can be respectively disposed on the two second surfaces 23.
[0049] In some embodiments, at least part of the two electrode lead-out sheets 24 is disposed on at least one of the two second insulating members 5, so as to be disposed on at least one of the two second surfaces 23. In some other embodiments, the second surface 23 is insulated, and at least part of the two electrode lead-out sheets 24 can be directly disposed on at least one of the two second surfaces 23.
[0050] Please refer to Figures 1 to 7 , Figure 7 which is a schematic side structure diagram of the battery assembly 2 and the battery assembly fixing structure 1 along a direction perpendicular to the first direction. As Figures 1 to 7 shown, at least one edge of the second fixing plate 12 close to the electrode lead-out sheet 24 is provided with an avoidance notch 123 for avoiding the part of the two electrode lead-out sheets 24 disposed on the second surface 23, so that the part of the two electrode lead-out sheets 24 disposed on the second surface 23 is spaced apart from the second fixing plate 12.
[0051] Compared with the electrode lead-out piece 24 being arranged on the top surface or the bottom surface of the battery cell group 21 and the second fixing plate 12 being arranged on the second surface 23, at least part of the two electrode lead-out pieces 24 and the second fixing plate 12 are both arranged on the second surface 23, which can reduce the volume of the battery module 3, thereby improving the energy density of the battery module 3.
[0052] Wherein, in some embodiments, the first surface 22 is composed of the expansion surface 211a, and the second surface 23 is composed of the non-expansion surface 211b. Since the non-expansion surface 211b hardly expands, by arranging at least part of the electrode lead-out piece 24 on the second surface 23, the deformation of the electrode lead-out piece 24 can be avoided, thereby ensuring the stable and reliable electrical performance of the battery assembly 2.
[0053] Wherein, when at least part of the two electrode lead-out pieces 24 are both arranged on the same second surface 23 and are respectively close to the opposite sides of the second surface 23 along the first direction, one of the two second fixing plates 12 is provided with two avoidance notches 123, and the two avoidance notches 123 are arranged along the first direction and are respectively used for avoiding the parts of the corresponding electrode lead-out pieces 24 located on the second surface 23. When at least part of the two electrode lead-out pieces 24 are both arranged on the same second surface 23 and are adjacent to each other, one of the two second fixing plates 12 is provided with one avoidance notch 123, and the avoidance notch 123 is used for avoiding the parts of the two electrode lead-out pieces 24 located on the second surface 23. When at least part of the two electrode lead-out pieces 24 are respectively arranged on the two second surfaces 23, that is, at least part of one electrode lead-out piece 24 is arranged on one second surface 23, and at least part of the other electrode lead-out piece 24 is arranged on the other second surface 23, each second fixing plate 12 is provided with one avoidance notch 123, and the avoidance notch 123 of each second fixing plate 12 is used for avoiding the part of the corresponding electrode lead-out piece 24 located on the second surface 23.
[0054] Wherein, as Figure 6 shown, each electrode lead-out piece 24 includes a connection section 241 and a lead-out section 242 which are connected to each other, and the lead-out section 242 is arranged on the second surface 23. The battery assembly 2 includes a plurality of electrode posts, the plurality of electrode posts are located on the top surface of the battery cell group 21, the top surface and the bottom surface of the battery cell 211 are arranged oppositely and are both perpendicular to the first direction and the second direction. One end of the connection section 241 is connected to the lead-out section 242, and the other end is connected to an electrode post. That is, the connection section 241 of one electrode lead-out piece 24 is connected to an electrode post, and the connection section 241 of the other electrode lead-out piece 24 is connected to another electrode post.
[0055] In some embodiments, such as Figure 1 , Figure 2 , Figure 6 and Figure 7 shown, the two electrode lead tabs 24 are respectively a positive electrode lead tab 24a and a negative electrode lead tab 24b arranged at intervals, and at least part of the positive electrode lead tab 24a and at least part of the negative electrode lead tab 24b are arranged on the same second surface 23. As Figures 1 to 6 shown, two avoidance notches 123 are arranged at intervals on the edge of one of the second fixing plates 12, and the two avoidance notches 123 are respectively close to the positive electrode lead tab 24a and the negative electrode lead tab 24b. One of the avoidance notches 123 is used to avoid the part of the positive electrode lead tab 24a arranged on the second surface 23, so that the avoidance notch 123 and the part of the positive electrode lead tab 24a arranged on the second surface 23 are arranged at intervals. The other avoidance notch 123 is used to avoid the part of the negative electrode lead tab 24b arranged on the second surface 23, so that the avoidance notch 123 and the part of the negative electrode lead tab 24b arranged on the second surface 23 are arranged at intervals.
[0056] Arranging at least part of the positive electrode lead tab 24a and at least part of the negative electrode lead tab 24b on the same second surface 23 is beneficial to simplifying the assembly process of the battery assembly 2, and reasonably planning the positions of the positive electrode lead tab 24a and the negative electrode lead tab 24b can optimize the internal structure of the battery assembly 2 and improve the space utilization rate.
[0057] Among them, the battery assembly 2 includes a plurality of positive electrode posts and a plurality of negative electrode posts, the connecting section 241 of the positive electrode lead tab 24a is connected to one of the plurality of positive electrode posts, and the connecting section 241 of the negative electrode lead tab 24b is connected to one of the plurality of negative electrode posts.
[0058] In some embodiments, such as Figure 6 shown, the battery assembly 2 further includes a connecting piece 25, one end of the connecting piece 25 is connected to the positive electrode post of a battery cell 211, and the other end is connected to the negative electrode post of another adjacent battery cell 211. That is, the connecting piece 25 is connected between the pole posts of different polarities of two adjacent battery cells 211.
[0059] In some embodiments, such as Figures 3 to 5As shown, the second fixed plate body 121 includes a first inner surface 1211 and a first outer surface 1212 that are oppositely arranged. The first inner surface 1211 is closer to the other second fixed plate 12 than the first outer surface 1212. The second fixed plate 12 further includes a support portion 124 that protrudes from one side of the first inner surface 1211 of the second fixed plate body 121. The support portion 124 is used to carry the battery assembly 2. The support portion 124 can be a strip-shaped plate, and the extending direction of the support portion 124 is parallel to the first direction.
[0060] In some embodiments, as Figures 1 to 5 and Figure 7 shown, the second fixed plate 12 further includes a hanging ear 125 that is provided on the first outer surface 1212 of the second fixed plate body 121.
[0061] The hanging ear 125 is used to be connected to a hoisting device, so as to stably place the battery module 3 in the housing through the hoisting device, facilitating the assembly to form an energy storage device.
[0062] In some embodiments, the second fixed plate 12 may include at least two hanging ears 125, so that the hoisting device can more stably place the battery module 3 in the housing. In other embodiments, the second fixed plate 12 may include one hanging ear 125.
[0063] In some embodiments, as Figure 4 and Figure 5 shown, the second fixed plate 12 further includes at least one reinforcing rib 126 that protrudes from one side of the first outer surface 1212 of the second fixed plate body 121. The at least one reinforcing rib 126 can enhance the structural strength of the second fixed plate body 121 and reduce stress concentration.
[0064] Among them, the at least one reinforcing rib 126 may include two first reinforcing ribs 1261 and one second reinforcing rib 1262. The two first reinforcing ribs 1261 are respectively provided on two opposite edges of the second fixed plate body 121 along the first direction. The second reinforcing rib 1262 and the support portion 124 are respectively provided on two opposite edges of the second fixed plate body 121 along the second direction.
[0065] The extending direction of each first reinforcing rib 1261 is perpendicular to the first direction and the second direction. The extending direction of the second reinforcing rib 1262 is parallel to the first direction.
[0066] Please refer to Figures 1 to 3 、 Figure 8 and Figure 9 , Figure 8is Figure 3 A schematic structural view of the first fixing plate 11 shown at an angle. Figure 9 is Figure 3 A schematic structural view of the first fixing plate 11 shown at another angle. In some embodiments, as shown in Figures 1 to 3 , Figure 8 and Figure 9 shown, the first fixing plate 11 includes a first fixing plate main body 111 and a convex portion 112. The first fixing plate main body 111 is fixedly connected to two adjacent second fixing plates 12, that is, connected to two adjacent second fixing plate main bodies 121. The first fixing plate main body 111 includes a second inner surface 1111 and a second outer surface 1112 which are oppositely arranged. The second inner surface 1111 is closer to another first fixing plate 11 than the second outer surface 1112. The convex portion 112 protrudes from the second inner surface 1111 in a direction away from another first fixing plate 11. The convex portion 112 extends along the second direction. When the first fixing plate 11 is attached to the first surface 22, there is a gap between the convex portion 112 and the first surface 22. And / or, the first fixing plate 11 further includes a reinforcing portion 113. The reinforcing portion 113 protrudes from one side of the second outer surface 1112 of the first fixing plate main body 111. The reinforcing portion 113 extends along the second direction.
[0067] In some embodiments, as shown in Figures 1 to 3 , Figure 8 and Figure 9 shown, the first fixing plate 11 may include one convex portion 112. In other embodiments, the first fixing plate 11 may include at least two convex portions 112. The arrangement direction of the at least two convex portions 112 is perpendicular to the extension direction of the convex portion 112. The convex portion 112 may extend from one end to the other end of the first fixing plate main body 111 along the second direction.
[0068] Among them, the convex portion 112 protrudes outward from the second inner surface 1111 of the first fixing plate main body 111, which is equivalent to increasing the cross-sectional area of the first fixing plate 11 in the first direction, so that the first fixing plate 11 can resist greater bending moment and shear force. And when the battery assembly 2 expands in the first direction, the battery assembly 2 will exert pressure on the first fixing plate 11. The convex portion 112 helps to disperse the applied pressure and avoid stress concentration. Therefore, the strength of the first fixing plate 11 along the first direction is increased.
[0069] By providing the convex portion 112, the structural strength of the first fixing plate 11 can be enhanced, especially the strength of the first fixing plate 11 in the first direction. When the battery assembly 2 expands in the first direction, the first fixing plate 11 is not easily deformed in the first direction, thereby improving the binding force on the battery assembly 2 in the first direction. In addition, a gap is reserved between the convex portion 112 and the first surface 22. When the battery assembly 2 expands in the first direction, this gap can serve as a buffer for the expansion pressure, effectively absorbing and releasing part of the expansion energy, thereby reducing the direct pressure borne by the first fixing plate 11, and further ensuring the overall stability and safety of the battery module 3.
[0070] The reinforcing portion 113 can enhance the structural strength of the first fixing plate body 111 and reduce stress concentration.
[0071] In some embodiments, as Figures 1 to 3 and Figures 8 to 10 shown, the first fixing plate 11 includes two edges oppositely arranged along the third direction (such as the Z direction shown in Figure 1 ), namely a first edge 114 and a second edge 115, and the third direction is perpendicular to the first direction and the second direction.
[0072] In some embodiments, as Figures 1 to 3 , Figure 8 and Figure 9 shown, the first fixing plate 11 may include two reinforcing portions 113, and the two reinforcing portions 113 respectively protrude from the first edge 114 and the second edge 115. In other embodiments, the first fixing plate 11 may include one reinforcing portion 113, and this reinforcing portion 113 protrudes from one of the first edge 114 and the second edge 115.
[0073] In other embodiments, the reinforcing portion 113 may also protrude from at least one of the two edges oppositely arranged along the second direction of the first fixing plate body 111.
[0074] In some embodiments, the first surface 22 is composed of the expanded surface 211a, and the second surface 23 is composed of the non-expanded surface 211b. When the battery module 2 expands, mainly the expanded surface 211a expands, that is, the battery module 2 expands to a greater extent in the first direction and applies a greater force to the first fixing plate 11. By providing that the first fixing plate 11 includes the convex portion 112, the structural strength of the first fixing plate 11 can be enhanced by using the convex portion 112, thereby increasing the restraint of the first fixing plate 11 on the battery module 3 in the first direction. Moreover, the gap between the convex portion 112 and the first surface 22 helps to release the expansion pressure, reduces the pressure borne by the first fixing plate 11, and prevents the first fixing plate 11 from being severely deformed. In addition, since the second surface 23 is composed of the non-expanded surface 211b, when the battery module 2 expands, the expansion degree of the battery module 2 in the second direction is very small. By providing that the second fixing plate 12 includes the hollow area 121a, not only the weight of the battery module fixing structure 1 can be reduced, but also the restraint on the battery module 2 will not be affected.
[0075] In some embodiments, as described above, the first fixing plate 11 includes two edges oppositely arranged along the third direction. Among them, the first surface 22 of the battery module 2 extends to the side of one edge away from the other edge, that is, the second surface 23 protrudes from the side of one edge away from the other edge. By providing that the first surface 22 protrudes from the side of one edge of the first fixing plate 11 away from the other edge, the first fixing plate main body 111 does not completely fit the first surface 22. Thus, when the battery module 2 expands, the portion of the first surface 22 that is not in contact with the first fixing plate main body 111 can release part of the expansion pressure, thereby further ensuring the overall stability and safety of the battery module 3.
[0076] Please refer to Figure 10 , Figure 10 is a schematic side view of the battery module 2 and the battery module fixing structure 1 along a direction parallel to the first direction. As Figure 10 shown, the first edge 114 is farther from the supporting portion 124 of the second fixing plate 12 than the second edge 115, and the first surface 22 of the battery module 2 extends to the side of the first edge 114 away from the second edge 115, that is, the first surface 22 protrudes from the side of the first edge 114 away from the second edge 115.
[0077] In some other embodiments, the first surface 22 of the battery assembly 2 extends to a side of the second edge 115 away from the first edge 114, that is, the first surface 22 protrudes from a side of the second edge 115 away from the first edge 114.
[0078] Wherein, the first surface 22 may only protrude from a side of the first edge 114 away from the second edge 115 or only protrude from a side of the second edge 115 away from the first edge 114; alternatively, opposite sides of the first surface 22 along the third direction respectively protrude from a side of the first edge 114 away from the second edge 115 and a side of the second edge 115 away from the first edge 114.
[0079] In some embodiments, as Figure 4 、 Figure 5 、 Figure 8 and Figure 9 shown, the first fixing plate 11 includes two end portions 116 oppositely arranged along the second direction, at least one first mounting hole 1161 is formed in each end portion 116, and at least one second mounting hole 1263 is formed in each first reinforcing rib 1261. Bolts and nuts can be used to lock the first mounting hole 1161 and the second mounting hole 1263, so as to lock the end portion 116 and the first reinforcing rib 1261, and the first fixing plate 11 and the second fixing plate 12 are detachably and fixedly connected.
[0080] In other embodiments, the end portion 116 and the first reinforcing rib 1261 may also be fixedly connected by means of clamping, riveting, or bonding.
[0081] The embodiment of the present application further provides an energy storage device, the energy storage device includes the housing and the battery module 3 provided in any one of the foregoing embodiments, the housing has an accommodation space, and the battery module 3 is located in the accommodation space. The connection portion between the housing and the second fixing plate is fixedly connected to fixedly connect the battery module 3 and the housing.
[0082] In some embodiments, as Figure 4 shown, the connection portion 122 is provided with at least one connection hole 1221, and the at least one connection hole 1221 is used for fixedly connecting with the housing. For example, the connection portion 122 and the housing can be detachably and fixedly connected by means of bolt locking, and the battery module 3 and the housing are detachably and fixedly connected.
[0083] In some embodiments, the first surface 22 is composed of an expanded surface 211a, and the second surface 23 is composed of a non-expanded surface 211b. Since the second fixing plate body 121 is attached to the second surface 23 and the second surface 23 is composed of the non-expanded surface 211b, when the battery assembly 2 expands, the degree of expansion of the battery assembly 2 in the second direction is very small. As a result, the displacement amount of the connecting portion 122 in the second direction is very small, and further the degree of deformation of the housing in the second direction is very small, thereby avoiding damage to the housing. If the connecting portion 122 protrudes from the second outer surface 1112 of the first fixing plate 11, when the battery assembly 2 expands, the degree of expansion of the battery assembly 2 in the first direction is relatively large, so that the displacement amount of the connecting portion 122 in the first direction is relatively large. This will cause a relatively large degree of deformation of the housing in the first direction and may damage the housing.
[0084] In some embodiments, there is a gap between the two first fixing plates 11 and the housing. This gap can provide a buffer space for the displacement of the two first fixing plates 11 when the battery assembly 2 expands, avoiding damage to the battery module 3.
[0085] The above are the implementation manners of the embodiments of the present application. It should be noted that for those of ordinary skill in the art in the technical field, without departing from the principle of the embodiments of the present application, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present application.
Claims
1. A battery module fixing structure for fixing a battery module, characterized in that, The battery assembly includes at least one battery cell group, the battery cell group includes a plurality of battery cells arranged in a first direction, the battery assembly further includes two first surfaces oppositely arranged in the first direction and two second surfaces oppositely arranged in a second direction, the second direction being perpendicular to the first direction; The battery assembly fixing structure includes: Two first fixing plates respectively used for being attached to the two first surfaces of the battery assembly; Two second fixing plates respectively used for being attached to the two second surfaces of the battery assembly, the second fixing plates and the first fixing plates surround the battery assembly and are alternately arranged along the surrounding direction, each second fixing plate is fixedly connected to two adjacent first fixing plates, the two first fixing plates are used for clamping the battery assembly along the first direction, and the two second fixing plates are used for clamping the battery assembly along the second direction; Wherein, the second fixing plate includes a second fixing plate main body and a connecting portion, the second fixing plate main body is fixedly connected to two adjacent first fixing plates, the second fixing plate main body is provided with a hollowed-out area, the hollowed-out area penetrates through the second fixing plate main body along the second direction, and the connecting portion protrudes from the edge of the hollowed-out area in a direction away from the other second fixing plate and protrudes from the second fixing plate main body, and the connecting portion is used for connecting with a housing for accommodating the battery assembly.
2. The battery component fixing structure according to claim 1, wherein, The battery assembly includes at least two battery cell groups arranged in the second direction, each battery cell group includes two first surfaces oppositely arranged in the first direction and two second surfaces oppositely arranged in the second direction, the first surfaces on the same side of the at least two battery cell groups together form a first surface, the at least two battery cell groups include two outer battery cell groups located on the outermost sides in the second direction, and the second surface facing outwards of one of the two outer battery cell groups forms a second surface, and the second surface facing outwards of the other outer battery cell group forms another second surface.
3. The battery module fixing structure according to claim 1, wherein, The connecting portion and the edge of the hollowed-out area are integrally formed.
4. The battery module fixing structure according to claim 1, wherein, The battery assembly further includes two electrode lead-out sheets, at least part of the two electrode lead-out sheets is arranged on at least one of the two second surfaces, and an avoidance notch is provided at the edge of at least one second fixing plate close to the electrode lead-out sheets for avoiding the part of the two electrode lead-out sheets arranged on the second surface.
5. The battery module fixing structure according to claim 4, wherein, The two electrode lead-out sheets are respectively a positive electrode lead-out sheet and a negative electrode lead-out sheet arranged at intervals, at least part of the positive electrode lead-out sheet and at least part of the negative electrode lead-out sheet are arranged on the same second surface, and two avoidance notches are arranged at intervals at the edge of one of the second fixing plates, the two avoidance notches are respectively close to the positive electrode lead-out sheet and the negative electrode lead-out sheet, one avoidance notch is used for avoiding the part of the positive electrode lead-out sheet arranged on the second surface, and the other avoidance notch is used for avoiding the part of the negative electrode lead-out sheet arranged on the second surface.
6. The battery module fixing structure according to claim 1, characterized in that, The second fixing plate body includes a first inner surface and a first outer surface which are oppositely arranged. The first inner surface is closer to another second fixing plate than the first outer surface. The second fixing plate further includes a supporting portion which protrudes from one side of the first inner surface of the second fixing plate body, and the supporting portion is used for carrying the battery assembly.
7. The battery module fixing structure according to claim 1, wherein, The first fixing plate includes a first fixing plate body and a convex portion. The first fixing plate body is fixedly connected to two adjacent second fixing plates. The first fixing plate body includes a second inner surface and a second outer surface which are oppositely arranged. The second inner surface is closer to another first fixing plate than the second outer surface. The convex portion protrudes from the first fixing plate body in a direction away from another first fixing plate along the second inner surface. The convex portion extends along the second direction. When the first fixing plate is attached to the first surface, there is a gap between the convex portion and the first surface; and / or the first fixing plate further includes a reinforcing portion which protrudes from one side of the second outer surface of the first fixing plate body, and the reinforcing portion extends along the second direction.
8. The battery component fixing structure according to claim 1, wherein, The first fixing plate includes two edges oppositely arranged along the third direction, and a first surface of the battery assembly extends to a side of one edge away from the other edge, and the third direction is perpendicular to the second direction and the first direction.
9. A battery module, characterized in that, The battery module includes a battery assembly and the battery assembly fixing structure according to any one of claims 1-8.
10. An energy storage device, characterized in that, The energy storage device includes a housing and the battery module according to claim 9. The housing has an accommodation space, and the battery module is located in the accommodation space.