Fastening assembly of battery module and battery pack

Abstract

The utility model relates to the technical field of battery packs, and particularly discloses a fastening assembly of a battery module and a battery pack, the fastening assembly comprises a bottom plate, a limiting piece, an adjusting end plate and a positioning plate, the bottom plate is provided with an accommodating space for placing the bottom end of a battery cell, the limiting piece is arranged in the accommodating space, and the adjusting end plate is arranged on the positioning plate. The base plate is provided with a containing space, the containing space is divided into at least two battery cell containing grooves, the adjusting end plates are arranged at the two ends of the base plate in the second direction, and the two adjusting end plates can move towards the sides close to each other in the first direction, so that the multiple battery cells located in the battery cell containing grooves are pressed in the first direction; the end parts of the two positioning plates can be buckled with the end parts of the two adjusting end plates to form an annular clamping structure for clamping the battery cells, so that the space utilization rate in the shell can be effectively improved, and the battery cells are extruded by the two adjusting end plates, so that a gap between the battery cells can be reduced, the overall energy density of the battery pack can be improved, and the service life of the battery pack is prolonged. And the overall assembly efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of battery module positioning, and specifically to a fastening component for a battery module and a battery pack. Background Technology

[0002] With the rapid development of new energy technologies, portable energy storage devices such as battery packs have been widely used in automobiles and other fields, especially in electric vehicles. However, the biggest problem with electric vehicles is that their driving range cannot meet the needs of users. Companies need to find ways to improve the driving range of electric vehicles. Currently, there are two methods to improve the driving range of electric vehicles: 1. Increase the volume of the battery pack to increase the number of cells it can accommodate, thereby increasing the battery pack's capacity; 2. Increase the energy density of the battery pack, thereby increasing the capacity.

[0003] However, in existing technologies, electric vehicles have limited space for battery pack installation, which means that increasing the battery pack's volume cannot increase its capacity. Therefore, the only way to increase the capacity is to improve the energy density of the battery pack. In existing technologies, the battery pack includes a housing and battery modules. Typically, multiple cells are assembled into battery modules on the outside, and then the battery modules are placed into the housing and positioned by steel strips. However, the steel strip positioning means that the battery modules can only be installed in a predetermined area of ​​the housing, which leads to low space utilization within the housing, limiting the improvement of the battery pack's energy density and resulting in low battery pack assembly efficiency. Summary of the Invention

[0004] This utility model was made in consideration of the aforementioned problems. The purpose of this utility model is to provide a fastening component and battery pack for a battery module, which can improve the energy density of the battery module through extrusion and has high assembly efficiency.

[0005] To achieve the above objectives, this utility model provides a fastening assembly for a battery module, comprising:

[0006] The base plate has a space on it to accommodate the bottom end of the battery cell;

[0007] A limiting member is arranged on the base plate along a first direction and divides the accommodating space into at least two cell accommodating slots, wherein the cells in each cell accommodating slot are stacked along the first direction.

[0008] Adjusting end plates are arranged at both ends of the base plate along a second direction perpendicular to the first direction. Both adjusting end plates can move along the first direction toward each other to press the battery cell located in the battery cell receiving slot.

[0009] Positioning plates are arranged on both sides of the base plate along a first direction and can abut against the side of the battery cell. The ends of the two positioning plates can be engaged with the ends of the two adjusting end plates to form a ring clamping structure for clamping the battery cell.

[0010] According to the fastening assembly of the battery module described above, both sides of the adjusting end plate are provided with connecting plates, and both ends of the positioning plate are provided with first positioning holes. The connecting plates can be inserted into the first positioning holes and fit against the inner wall of the first positioning holes.

[0011] According to the fastening assembly of the battery module described above, the base plate includes a base plate body, side plates and crossbeams. Two side plates are arranged on both sides of the base plate body along a first direction, and two crossbeams are arranged at both ends of the base plate body along a second direction. The two side plates, the two crossbeams and the base plate body together form the receiving space.

[0012] According to the fastening assembly of the battery module described above, a positioning block is provided on the crossbeam, and a second positioning hole is provided at the bottom of the adjusting end plate. When the positioning block is inserted into the second positioning hole, the adjusting end plate presses the battery cell located in the battery cell receiving groove, and the inner side of the adjusting end plate can abut against the end of the limiting member.

[0013] According to the fastening assembly of the battery module described above, each of the accommodating spaces is provided with two limiting members, and the two limiting members can cooperate with the two side plates to divide the accommodating space into three cell accommodating slots.

[0014] According to the fastening assembly of the battery module described above, the limiting member is a steel pipe, which is arranged on the base plate body along a first direction and perpendicular to the crossbeam.

[0015] According to the fastening assembly of the battery module described above, the steel pipe is flat and has a first sidewall and a second sidewall, the first sidewall and the second sidewall being respectively able to abut against the ends of the two sets of battery cells.

[0016] According to the fastening assembly of the battery module described above, a heat dissipation channel is provided between the first sidewall and the second sidewall.

[0017] According to the fastening assembly of the battery module described above, the adjusting end plate is provided with reinforcing ribs, and a plurality of the reinforcing ribs are arranged in a cross pattern on the outer side of the adjusting end plate.

[0018] A battery pack, comprising:

[0019] shell;

[0020] As described above, at least two of the fastening components are arranged vertically within the housing, and the top and bottom of the positioning plate are provided with support portions, with the support portions of the two positioning plates arranged vertically abutting against each other.

[0021] Battery modules, wherein multiple battery modules are respectively secured within the housing by two fastening components.

[0022] This utility model has the following beneficial effects:

[0023] 1. An adjustable end plate and a positioning plate are used to form a ring clamping structure for clamping multiple battery modules arranged in the horizontal direction. Compared with steel strip fixation, its position is adjustable, which can save space inside the box. Moreover, by adjusting the end plate, the battery cells can be squeezed to the maximum extent, thereby reducing the distance between the battery cells and improving the energy density of the battery pack.

[0024] 2. The battery cells can be directly assembled inside the box without first assembling them into battery modules on the outside and then placing them into the box for positioning. They can be stacked directly on the base plate. The adjustment end plate and positioning plate can also be fastened together to clamp the battery modules, resulting in high assembly efficiency.

[0025] 3. Compared to using steel strips, using positioning plates can provide support for the stacking of battery modules, eliminating the need for additional support and positioning components. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the battery pack in an embodiment;

[0027] Figure 2 This is a schematic diagram of the fastening components and battery module assembly in an embodiment;

[0028] Figure 3 This is a schematic diagram of the fastening component structure in an embodiment;

[0029] Figure 4 This is a schematic diagram of the adjustment end plate structure in an embodiment.

[0030] In the picture:

[0031] 100. Base plate; 110. Cell receiving slot; 120. Base plate body; 130. Side plate; 140. Crossbeam; 141. Positioning block; 200. Steel pipe; 210. Heat dissipation channel; 300. Adjustment end plate; 310. Connecting plate; 320. Second positioning hole; 330. Reinforcing rib; 400. Positioning plate; 410. First positioning hole; 420. Support part; 500. Outer shell; 600. Battery module. Detailed Implementation

[0032] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0033] like Figure 1-4 As shown, a battery pack includes a housing 500, a battery module 600, and a fastening assembly. The battery module 600 is fixed inside the housing 500 by the fastening assembly, which can prevent the battery module 600 from shaking inside the housing 500.

[0034] In the existing technology, the battery cells are assembled into a battery module 600 outside the outer casing 500 and then placed inside the outer casing 500. They are then clamped and fixed by the steel strip inside the outer casing 500. However, since the battery module 600 has already been assembled, the steel strip only serves to clamp and fix it. This can easily lead to large gaps between the battery cells in the battery module 600. Moreover, the battery modules 600 can only be fixed in a preset area, which can easily cause space waste, resulting in low battery energy density. In addition, the assembly steps are cumbersome and affect assembly efficiency.

[0035] In this embodiment, a fastening assembly for a battery module includes a base plate 100, a limiting member, an adjusting end plate 300, and a positioning plate 400.

[0036] The base plate 100 has a receiving space for accommodating the bottom end of the battery cell. A limiting member is arranged on the base plate 100 along a first direction and can divide the receiving space into at least two battery cell receiving slots 110. The battery cells in each battery cell receiving slot 110 are stacked along the first direction. Adjusting end plates 300 are arranged on both ends of the base plate 100 along a second direction. Both adjusting end plates 300 can move towards each other along the first direction to press the multiple battery cells located in the battery cell receiving slots 110 from the first direction. Positioning plates 400 are arranged on both sides of the base plate 100 along the first direction and can abut against the sides of the battery cells. The ends of the two positioning plates 400 can be engaged with the ends of the two adjusting end plates 300. This forms a ring-shaped clamping structure for holding the battery cells. Specifically, the positioning plate 400 and the adjusting end plate 300 are used to fix multiple battery modules 600 in four directions. The installation position of the battery modules 600 can be changed according to the arrangement position of the base plate 100, which can effectively improve the space utilization rate inside the housing 500. Furthermore, by squeezing the battery cells with the two adjusting end plates 300, the gap between the battery cells can be reduced, which can improve the overall energy density of the battery pack. At the same time, since the assembly step of the battery modules 600 on the outside of the housing 500 is omitted, the overall assembly process is simpler. Moreover, the positioning plate 400 and the adjusting end plate 300 can be connected by a simple snap-fit ​​method, which can improve the overall assembly efficiency.

[0037] In this embodiment, each base plate 100 is provided with at least two battery modules 600 arranged along the second direction, that is, the adjusting end plate 300 and the positioning plate 400 can clamp multiple battery modules 600 at the same time, thereby improving work efficiency.

[0038] The second direction is perpendicular to the first direction, meaning the limiting member and the adjusting end plate 300 are spatially perpendicular. This means the two adjusting end plates 300 are located at opposite ends of the battery module 600 and can simultaneously connect to the ends of multiple battery modules 600. Since foam is provided between the battery cells, when the two adjusting end plates 300 move towards each other along the first direction, they can compress the foam between the battery cells, thereby reducing the distance between them and making the cell arrangement more compact, thus improving the energy density of the battery pack.

[0039] In this embodiment, in order to increase the energy density of the battery pack, two layers of battery modules 600 are provided inside the outer casing 500, that is, two fastening components are provided. The two fastening components can fix the upper and lower layers of battery modules 600. At least two fastening components are arranged vertically inside the outer casing 500. The top and bottom of the positioning plate 400 in the fastening components are provided with support parts 420. The support parts 420 of the two positioning plates 400 arranged vertically abut against each other. The mutual abutment of the support parts 420 of the positioning plates 400 can provide support for the fastening components located at the top, without the need to set up additional support parts 420. Of course, each layer of battery module 600 is not limited to one, that is, multiple battery modules 600 are respectively set in the outer casing 500 by two fastening components.

[0040] To achieve the engagement between the adjusting end plate 300 and the positioning plate 400, connecting plates 310 are provided on both sides of the adjusting end plate 300. The positioning plate 400 has first positioning holes 410 at both ends. After the adjusting end plate 300 moves into position, the connecting plate 310 can be inserted into the first positioning hole 410, and at this time, the connecting plate 310 is in contact with the inner wall of the first positioning hole 410. When the connecting plates 310 on both adjusting end plates 300 are inserted into the first positioning holes 410, the foam between the battery cells provides a restoring force acting on the two adjusting end plates 300. At this time, the two ends of the adjusting end plates 300 are essentially held by the positioning plates 400. The two ends of the positioning plates 400 are subjected to opposing forces from the two adjusting end plates 300, thus using the two positioning plates 400 to hold the two adjusting end plates 300, preventing the two adjusting end plates 300 from being driven by the restoring force to move away from each other, ensuring the stability of the clamping.

[0041] Specifically, the base plate 100 includes a base plate body 120, side plates 130 and crossbeams 140. The two side plates 130 are arranged on both sides of the base plate body 120 along a first direction, and the two crossbeams 140 are arranged at both ends of the base plate body 120 along a second direction. The two side plates 130, the two crossbeams 140 and the base plate body 120 together form an accommodating space.

[0042] In order to achieve the positioning block 141 on the crossbeam 140, the bottom of the adjusting end plate 300 is provided with a second positioning hole 320. When the positioning block 141 is inserted into the second positioning hole 320, the adjusting end plate 300 is in the state of pressing the battery cell located in the battery cell receiving groove 110. That is, after the adjusting end plate 300 presses the battery cell, its second positioning hole 320 corresponds to the positioning block 141. By inserting the positioning block 141 into the second positioning hole 320, the adjusting end plate 300 is completely positioned. In this state, the inner side of the adjusting end plate 300 abuts against the end of the limiting member. The limiting member can limit the adjusting end plate 300 and prevent the battery cell from being squeezed excessively.

[0043] In this embodiment, each accommodating space is provided with two limiting members. The two limiting members can work with the two side plates 130 to divide the accommodating space into three cell accommodating slots 110, which can accommodate three sets of battery modules 600 at the same time. The specific number can be determined according to the space size of the outer shell 500 and the width size of the battery module 600.

[0044] In this embodiment, the limiting member is a steel pipe 200, which is arranged on the base plate body 120 along the first direction and perpendicular to the crossbeam 140. The steel pipe 200 is set between adjacent battery cell modules. In addition to separating the two adjacent battery modules 600, the steel pipe 200 can also play a role in heat conduction. That is, in the same battery module 600, each cell has a temperature difference due to different heat dissipation conditions. After heat conduction through the steel pipe 200, the heat can be evened out, the temperature difference between the cells can be reduced, and the battery performance can be improved.

[0045] In this embodiment, the steel pipe 200 is flat and has a first sidewall and a second sidewall. The first sidewall and the second sidewall can respectively abut against the ends of the two sets of battery cells. The flat shape can increase the contact area with the ends of the battery cells, thereby ensuring the heat conduction effect.

[0046] To improve the heat dissipation of the battery module 600, a heat dissipation channel 210 is provided between the first side wall and the second side wall. That is, the first side wall and the second side wall are designed separately and do not directly contact each other. Through the heat dissipation channel 210, some of the heat of the battery cell can be quickly discharged, thereby improving the heat dissipation effect and preventing the overall temperature of the battery module 600 from becoming too high.

[0047] In this embodiment, since the elastic force of the foam between the battery cells is in the first direction, it will act on the adjustment end plates 300 at both ends. Therefore, the adjustment end plates 300 are subjected to a large force, which makes them prone to deformation and even breakage. Therefore, in this embodiment, reinforcing ribs 330 are provided on the adjustment end plates 300. Multiple reinforcing ribs 330 are arranged in a cross shape on the outside of the adjustment end plates 300. This can not only strengthen the strength of the adjustment end plates 300 and prevent them from deforming, but also prevent the reinforcing ribs 330 from affecting the compression of the battery cells.

[0048] In this embodiment, the battery pack assembly process is as follows:

[0049] Place the lower base plate 100 into the outer shell 500;

[0050] The battery cells are stacked sequentially in the battery cell receiving slot 110 of the base plate 100;

[0051] After the battery cells are stacked, multiple battery modules 600 are squeezed from the first direction using the adjusting end plate 300.

[0052] The two ends of the positioning plate 400 are fastened to the ends of the adjusting end plate 300 to complete the assembly of the lower battery module 600.

[0053] Repeat the above steps to complete the assembly of the upper battery module 600.

[0054] Its overall assembly process is simple and easy to operate.

[0055] The technical solution of this utility model has been described in detail above with reference to the accompanying drawings. The described embodiments are used to help understand the concept of this utility model. The specific embodiments described herein are merely illustrative examples of the spirit of this utility model. Those skilled in the art to which this utility model pertains can make various modifications or additions to the described specific embodiments or use similar methods to replace them, but without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0056] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0057] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0058] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0059] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

Claims

1. A fastening assembly for a battery module, characterized in that, include: The base plate has a space on it to accommodate the bottom end of the battery cell; A limiting member is arranged on the base plate along a first direction and divides the accommodating space into at least two cell accommodating slots, wherein the cells in each cell accommodating slot are stacked along the first direction. Adjusting end plates are arranged at both ends of the base plate along a second direction perpendicular to the first direction. Both adjusting end plates can move along the first direction toward each other to press the battery cell located in the battery cell receiving slot. Positioning plates are arranged on both sides of the base plate along a first direction and can abut against the side of the battery cell. The ends of the two positioning plates can be engaged with the ends of the two adjusting end plates to form a ring clamping structure for clamping the battery cell.

2. The fastening assembly for a battery module according to claim 1, characterized in that, Both ends of the adjustment end plate are provided with connecting plates, and both ends of the positioning plate are provided with first positioning holes. The connecting plates can be inserted into the first positioning holes and fit against the inner wall of the first positioning holes.

3. The fastening assembly for a battery module according to claim 1, characterized in that, The base plate includes a base plate body, side plates, and crossbeams. The two side plates are arranged on both sides of the base plate body along a first direction, and the two crossbeams are arranged at both ends of the base plate body along a second direction. The two side plates, the two crossbeams, and the base plate body together form the accommodating space.

4. The fastening assembly for a battery module according to claim 3, characterized in that, The crossbeam is provided with a positioning block, and the bottom of the adjusting end plate is provided with a second positioning hole. When the positioning block is inserted into the second positioning hole, the adjusting end plate presses the battery cell located in the battery cell receiving slot, and the inner side of the adjusting end plate can abut against the end of the limiting member.

5. A fastening assembly for a battery module according to claim 3, characterized in that, Each of the aforementioned accommodating spaces is provided with two of the aforementioned limiting members, which can cooperate with the two of the aforementioned side plates to divide the accommodating space into three equally spaced cell accommodating slots.

6. A fastening assembly for a battery module according to claim 5, characterized in that, The limiting component is a steel pipe, which is arranged on the base plate body along the first direction and perpendicular to the crossbeam.

7. A fastening assembly for a battery module according to claim 6, characterized in that, The steel pipe is flat and has a first sidewall and a second sidewall, which can respectively abut against the ends of the two sets of battery cells.

8. A fastening assembly for a battery module according to claim 7, characterized in that, A heat dissipation channel is provided between the first sidewall and the second sidewall.

9. A fastening assembly for a battery module according to claim 1, characterized in that, The adjusting end plate is provided with reinforcing ribs, and multiple reinforcing ribs are arranged in a cross pattern on the outer side of the adjusting end plate.

10. A battery pack, characterized in that, include: shell; As described in any one of claims 1-9, at least two of the fastening components are arranged vertically within the housing, and the top and bottom of the positioning plate are provided with support portions, with the support portions of the two positioning plates arranged vertically abutting against each other. Battery modules, wherein multiple battery modules are respectively secured within the housing by two fastening components.

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