End plate, battery module and battery pack

Abstract

The utility model relates to the technical field of batteries, in particular to an end plate, a battery module and a battery pack, the end plate is applied to the battery module, the battery module further comprises a battery cell assembly, the end plate is arranged at the end of the battery cell assembly in the stacking direction of the battery cell assembly, and the end plate comprises a main plate body and a first mounting part; the first mounting part is arranged on one side, deviating from the battery cell assembly, of the main plate body and is connected with the main plate body, and the first mounting part is used for being connected with a target ground through a first fastening component. According to the novel end plate structure of the battery module provided by the invention, the first mounting part is arranged on one side of the main plate body and is matched with the second mounting part on the target place such as the following box body, so that the thickness of the main plate body can be effectively reduced, that is, the main plate body can be designed into a thin plate structure; the method has important significance in battery production, and no lightening hole needs to be designed, so that the processing technology is simplified, and the effect of reducing the cost is also achieved.

Description

End plate, battery module and battery pack Technical Field

[0001] This application relates to the field of battery technology, and in particular to an end plate, a battery module, and a battery pack. Background Technology

[0002] The battery pack consists of a housing and battery modules and a battery management system installed inside the housing. The battery module is composed of multiple individual battery cells (such as lithium-ion cells) connected in series or parallel, and integrates auxiliary components such as end plates, insulating plates, and foam. In the process of connecting the battery module to the housing, mounting through holes extending along its height are usually directly drilled on the end plate, so that bolts can be installed in these mounting through holes, and the bottom of the thread is locked to the bottom wall of the housing. This structure results in a large thickness of the end plate and high material cost. Moreover, in order to reduce weight, weight-reducing holes need to be machined or formed by casting, both of which have high process costs. Summary of the Invention

[0003] The purpose of this application is to provide an end plate, a battery module, and a battery pack, which to a certain extent solves the technical problems of the prior art, such as the large thickness of the end plate, high material cost, and the need to machine or form weight-reducing holes through casting process in order to reduce weight, which both result in high process costs.

[0004] This application provides an end plate for use in a battery module, the battery module further including a cell assembly, and the end plate is disposed at the end of the cell assembly along the stacking direction of the cell assembly. The end plate includes: a main body and a first mounting portion; wherein, the first mounting portion is disposed on the side of the main body opposite to the cell assembly, and the first mounting portion is connected to the main body, and the first mounting portion is used to connect to a target ground through a first fastening member.

[0005] In the above technical solution, the first mounting part is further provided with an oblong hole extending along the length direction of the battery module, and a threaded round hole is formed in the target location. The first fastening member is detachably installed in the oblong hole and the threaded round hole in sequence.

[0006] In any of the above technical solutions, the motherboard body further includes multiple flat plates and multiple U-shaped plates, and the flat plates and the U-shaped plates are sequentially and alternately arranged and connected along the length direction of the end plate.

[0007] In any of the above technical solutions, the motherboard body is a one-piece structure and is formed by bending.

[0008] In any of the above technical solutions, a limiting protrusion is further formed on the side of the main board away from the cell assembly, and the limiting protrusion extends along the height direction of the end plate; the battery module also includes a strap, the cell assembly and the end plate are fixed together by the strap wrapped around their outer periphery in the vertical direction, and the strap is limited between the first mounting part and the limiting protrusion along the length direction of the main board.

[0009] In any of the above technical solutions, the first mounting part is a structure formed by bending a flat plate, and the projection of the first mounting part along the stacking direction of the battery cell assembly is U-shaped.

[0010] In any of the above technical solutions, the first mounting part is further connected to the motherboard body by welding.

[0011] In any of the above technical solutions, the number of the first mounting parts is multiple, and they are arranged sequentially from top to bottom along the height direction of the motherboard body.

[0012] This application also provides a battery module, including a battery assembly and an end plate as described in any of the above technical solutions, wherein the end plate is disposed at at least one end of the battery assembly along its length. Therefore, all the beneficial technical effects of this end plate will not be elaborated further here.

[0013] This application also provides a battery pack, including a housing and an end plate as described in any of the above technical solutions. The battery module is installed in the housing, and the first mounting part is detachably connected to the bottom wall of the housing via the first fastening member. Therefore, it possesses all the beneficial technical effects of this end plate, which will not be elaborated further here.

[0014] In the above technical solution, the inner bottom wall of the box is further provided with a second mounting part, and the second mounting part is detachably connected to the first mounting part through the first fastening member.

[0015] In any of the above technical solutions, the second mounting portion further abuts against the first mounting portion located at the lowest point along the height direction of the motherboard body.

[0016] In any of the above technical solutions, the housing further includes an upper housing and a lower housing, both of which have flanges, and the flanges of the upper housing and the lower housing are detachably connected by a second fastening member; the battery pack also includes a sealing ring, and the sealing ring is compressed between the flanges of the upper housing and the lower housing.

[0017] In any of the above technical solutions, the outer wall of the box is further provided with a lifting part, and the lifting part is provided with a lifting hole.

[0018] In any of the above technical solutions, the hoisting part is a hollow shell structure formed by bending and assembling a flat plate, and an avoidance notch is formed on the side of the hoisting part near the box body.

[0019] Compared with the prior art, the beneficial effects of this application are as follows:

[0020] This application provides a novel end plate structure for a battery module. A first mounting portion is provided on one side of the main board body, which cooperates with a second mounting portion on the target, such as the casing described below. This can effectively reduce the thickness of the main board body, that is, the main board body can be designed as a thin plate structure, which can reduce costs. This is of great significance in battery production. Moreover, there is no need to design weight-reduction holes, which simplifies the processing technology and also reduces costs. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 is an assembly diagram of the battery module and the lower housing provided in an embodiment of this application;

[0023] Figure 2 is an enlarged structural diagram of point A in Figure 1;

[0024] Figure 3 is a schematic diagram of the end plate provided in an embodiment of this application;

[0025] Figure 4 is another structural schematic diagram of the end plate provided in an embodiment of this application;

[0026] Figure 5 is a structural schematic diagram of the lower housing provided in an embodiment of this application;

[0027] Figure 6 is an enlarged structural diagram of point B in Figure 5;

[0028] Figure 7 is a structural schematic diagram of the hoisting part provided in an embodiment of this application;

[0029] Figure 8 is an exploded view of the battery pack provided in an embodiment of this application;

[0030] Figure 9 is a schematic diagram of the structure of the battery pack provided in the embodiment of this application.

[0031] Figure label:

[0032] 1-End plate, 11-Main body, 111-Flat plate, 112-U-shaped plate, 12-First mounting part, 121-First flat plate, 122-Second flat plate, 123-Third flat plate, 124-Oval hole, 13-Limiting protrusion, 2-Cell assembly, 3-Binding strap, 10-Battery module, 20-Box, 21-Upper box, 22-Lower box, 221-Second mounting part, 2211-Threaded round hole, 23-Flanged edge, 24-Sealing ring, 25-Lifting part, 251-Lifting hole, 252-Avoidance notch, 30-First fastening component. Detailed Implementation

[0033] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0034] The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application.

[0035] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0036] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] The end plate, battery module, and battery pack according to some embodiments of this application are described below with reference to Figures 1 to 9.

[0039] Example 1

[0040] Referring to Figures 1 to 4, an embodiment of this application provides an end plate 1 applied to a battery module 10. The battery module 10 also includes a cell assembly 2. Along the stacking direction of the cell assembly 2, the end plate 1 is disposed at the end of the cell assembly 2. The end plate 1 includes a main body 11 and a first mounting part 12. The first mounting part 12 is disposed on the side of the main body 11 opposite to the cell assembly 2, and the first mounting part 12 is connected to the main body 11. The first mounting part 12 is used to connect to a target location through a first fastening member 30. It should be noted that this target location is the second mounting part 221 on the bottom wall of the housing 20 described below. Of course, it is not limited to this. This target location can also be the bottom wall of the housing 20, or other structures, depending on the actual needs.

[0041] As can be seen from the structure described above, this application provides a novel end plate structure for a battery module. A first mounting part 12 is provided on one side of the main board body 11, which cooperates with a second mounting part 221 on the target, such as the housing 20 described below. This can effectively reduce the thickness of the main board body 11. In other words, the main board body 11 can be designed as a thin plate structure, which can reduce costs. This is of great significance in battery production. Moreover, there is no need to design weight-reduction holes, which simplifies the processing technology and also reduces costs.

[0042] In this embodiment, preferably as shown in Figures 2, 3 and 6, the first mounting portion 12 is formed with an oblong hole 124 extending along the length direction of the battery module 10, and the second mounting portion 221 on the bottom wall of the target location, such as the housing 20, is formed with a threaded round hole 2211, and the first fastening member 30 is detachably installed in the oblong hole 124 and the threaded round hole 2211 in sequence.

[0043] As can be seen from the structure described above, by opening an oblong hole 124 on the first mounting part 12, the mounting position can be adjusted according to the actual length of the battery module 10, thereby meeting the needs for fixing modules of different lengths and making it more widely applicable.

[0044] In this embodiment, preferably as shown in Figures 3 and 4, the main board body 11 includes a plurality of flat plates 111 and a plurality of U-shaped plates 112, and the flat plates 111 and U-shaped plates 112 are sequentially and alternately arranged and connected along the length direction of the end plate 1.

[0045] As can be seen from the structure described above, the main board 11 is a structure formed by alternating flat plates 111 and U-shaped plates 112. That is to say, a U-shaped plate 112 is designed between two adjacent flat plates 111, which helps to improve the strength of the end plate 1.

[0046] Furthermore, preferably, the main body 11 is a one-piece structure and is formed by bending. This process is extremely simple and saves processing steps and eliminates mold opening costs compared with the existing end plate 1 machining or casting processes, thereby reducing costs.

[0047] It should be noted that the main body is not limited to a structure composed of a flat plate 111 and a U-shaped plate 112. It can also be designed as a flat plate 111 structure, and reinforcing ribs can be set on it. The specific choice depends on the actual needs.

[0048] In this embodiment, preferably as shown in FIG2, a limiting protrusion 13 is formed on the side of the main board body 11 away from the cell assembly 2, and the limiting protrusion 13 extends along the height direction of the end plate 1; the battery module 10 also includes a strap 3, the cell assembly 2 and the end plate 1 are fixed together by the strap 3 wrapped around their outer periphery in the vertical direction, and along the length direction of the main board body 11, the strap 3 is limited between the first mounting part 12 and the limiting protrusion 13.

[0049] As can be seen from the structure described above, the limiting protrusion 13 serves to limit the strap 3, prevent the strap 3 from shifting, and ensure the stability and robustness of the overall structure of the battery module 10.

[0050] Of course, this limiting protrusion 13 can also be omitted, depending on the actual needs.

[0051] In this embodiment, preferably as shown in Figures 2 and 3, the first mounting part 12 is a structure formed by bending the flat plate 111, and the projection of the first mounting part 12 along the stacking direction of the battery cell assembly 2 is U-shaped.

[0052] As can be seen from the structure described above, the first mounting part 12 is a structure formed by bending the flat plate 111. The molding process is extremely simple, the production efficiency is high, the process cost is low, and it can also reduce weight, which is helpful for lightweight design. At the same time, designing the first mounting part 12 into a U-shaped structure helps to improve the support strength.

[0053] Furthermore, preferably, the first mounting part 12 includes a first plate 121, a second plate 122 and a third plate 123 connected vertically in sequence, and the first plate 121 and the third plate 123 are respectively disposed on opposite sides of the second plate 122. The second plate 122 is provided with the aforementioned waist-shaped hole 124. Preferably, the second plate 122 can be a square plate, and the first plate 121 and the third plate 123 can be triangular plates. Of course, it is not limited to this.

[0054] In this embodiment, preferably as shown in FIG3, the first mounting part 12 is connected to the motherboard body 11 by welding. This process is simple, helps to improve production efficiency, and the connected structure is stable and firm. Of course, the connection method between the first mounting part 12 and the motherboard body 11 is not limited to this. Other connection methods can also be used, for example, the first mounting part 12 can also be connected to the motherboard by bolts or the like.

[0055] In this embodiment, preferably as shown in FIG2, there are multiple first mounting parts 12, which are arranged sequentially from top to bottom along the height direction of the main board body 11.

[0056] As can be seen from the structure described above, the design of multiple first mounting parts 12 improves the firmness and stability of the connection between the end plate 1 and the housing 20.

[0057] Furthermore, preferably, there are two first mounting portions 12, one near the top of the main board body 11 and the other near the bottom of the main board body 11, which meets the assembly requirements and reduces the number of portions, thus helping to reduce costs and save soldering steps. Of course, the number of first mounting portions 12 is not limited to two; it can be more than two, such as three or four, or less than two, such as one, depending on the actual needs.

[0058] Furthermore, preferably, the openings of the two first mounting portions 12 are arranged opposite to each other, with the opening of the first mounting portion 12 near the top facing downwards and the opening of the first mounting portion 12 near the bottom facing each other, so that the first mounting portion 12 near the bottom can abut against the second mounting portion 221. Of course, the orientation of the openings of the two first mounting portions 12 can also be designed according to actual needs. For example, the openings of the two first mounting portions 12 can both face downwards or upwards, or the opening of the first mounting portion 12 near the top faces upwards, and the opening of the first mounting portion 12 near the bottom faces downwards, etc.

[0059] Example 2

[0060] Referring to Figure 1, Embodiment 2 of this application also provides a battery module 10, including a battery assembly and the end plate 1 described in Embodiment 2 above. The end plate 1 is provided at least one end of the battery cell assembly 2 along its length. Therefore, it possesses all the beneficial technical effects of the end plate 1, and the same technical features and beneficial effects will not be repeated here.

[0061] In this embodiment, preferably, as shown in FIG1, the end plates 1 mentioned above are provided at both ends of the battery cell assembly 2 along the length direction of the battery cell assembly 2, and are tied together by the straps 3. Of course, it is not limited to this. The end plates 1 mentioned above can be provided only at one end of the battery cell assembly 2, and other types of end plates 1 can be provided at the other end of the battery cell assembly 2, depending on the actual needs.

[0062] Example 3

[0063] Referring to Figures 1 to 8, Embodiment 2 of this application also provides a battery pack, including a housing 20, a battery module 10, and the battery module 10 described in Embodiment 2 above, wherein the battery module 10 is installed inside the housing 20. Therefore, it possesses all the beneficial technical effects of the battery module 10, and the same technical features and beneficial effects will not be repeated here.

[0064] In this embodiment, preferably as shown in Figures 1 to 3, 5 and 6, the inner bottom wall of the housing 20 is provided with a second mounting portion 221, and the second mounting portion 221 is detachably connected to the first mounting portion 12 via a first fastening member 30.

[0065] As can be seen from the structure described above, a second mounting part 221 is provided on the inner bottom wall of the housing 20, thereby increasing the thickness of the mounting position and increasing the strength, and without directly opening a hole on the inner bottom wall of the housing 20, ensuring the support strength and sealing of the bottom wall of the housing 20.

[0066] Furthermore, preferably, the second mounting part 221 can be a cuboid structure, but of course, it is not limited to this.

[0067] It should be noted that: the structure is not limited to the above. Alternatively, the second mounting protrusion may not be provided on the housing 20. Instead, the aforementioned threaded round hole 2211 may be directly opened on the inner bottom wall of the housing 20. The specific choice depends on the actual needs.

[0068] In this embodiment, preferably, as shown in FIG2, the second mounting portion 221 abuts against the first mounting portion 12 located at the lowest point along the height direction of the main body 11.

[0069] As can be seen from the structure described above, the second mounting part 221 can also support the first mounting part 12, that is, support the battery assembly, making the battery module 10 more stable. Of course, it is not limited to this; a gap may also be formed between the second mounting part 221 and the first mounting part 12, etc.

[0070] In this embodiment, preferably as shown in Figures 8 and 9, the housing 20 includes an upper housing 21 and a lower housing 22, both of which have flanges 23. The flanges 23 of the upper housing 21 and the lower housing 22 are detachably connected by a second fastening member, such as a screw or bolt. The battery pack also includes a sealing ring 24, which is compressed between the flanges 23 of the upper housing 21 and the lower housing 22.

[0071] As can be seen from the structure described above, the flange 23 of the upper box 21 and the flange 23 of the lower box 22 are joined together, which makes it easy to install bolts on the joined flange 23 to lock the two together. The compression sealing ring 24 between the flange 23 of the upper box 21 and the flange 23 of the lower box 22 plays a role in sealing and preventing water leakage.

[0072] In this embodiment, preferably as shown in Figures 5, 7 and 9, the outer wall of the housing 20 is provided with a lifting part 25, and the lifting part 25 is provided with a lifting hole 251. A lifting ring is hung in the lifting hole 251, and a lifting rope can also be installed in the lifting hole 251, which facilitates the lifting of the battery pack. In addition, the lifting hole 251 can also be used as a mounting hole for fixing the battery pack to the installation site.

[0073] Furthermore, preferably, the hoisting part 25 is a hollow shell structure formed by bending and assembling a flat plate 111. This structure meets the strength requirements while also contributing to lightweight design, saving material costs, and simplifying the manufacturing process, thus helping to reduce costs.

[0074] Furthermore, preferably, the side of the hoisting part 25 near the housing 20 has an avoidance notch 252, which serves to avoid the aforementioned second fastening member.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An end plate applied to a battery module, the battery module further comprising a cell assembly, and the end plate being disposed at an end of the cell assembly along the stacking direction of the cell assembly, characterized in that, The end plate includes: a main board body and a first mounting part; wherein, the first mounting part is disposed on the side of the main board body opposite to the cell assembly, and the first mounting part is connected to the main board body, and the first mounting part is used to connect to the target ground through a first fastening member.

2. The end plate according to claim 1, characterized in that, The first mounting portion has an oblong hole extending along the length of the battery module, and a threaded circular hole is formed in the target location. The first fastening member is detachably installed in the oblong hole and the threaded circular hole in sequence.

3. The end plate according to claim 1, characterized in that, The main board includes multiple flat plates and multiple U-shaped plates, and the flat plates and U-shaped plates are sequentially and alternately arranged and connected along the length direction of the end plate.

4. The end plate according to claim 3, characterized in that, The motherboard body is a one-piece structure and is formed by bending.

5. The end plate according to claim 1, characterized in that, A limiting protrusion is formed on the side of the main board away from the cell assembly, and the limiting protrusion extends along the height direction of the end plate; the battery module also includes a strap, and the cell assembly and the end plate are fixed together by the strap wrapped around their outer periphery in a vertical direction, and the strap is limited between the first mounting part and the limiting protrusion along the length direction of the main board; and / or the first mounting part is a structure formed by bending a flat piece, and the projection of the first mounting part along the stacking direction of the cell assembly is U-shaped; and / or the first mounting part is connected to the main board by welding; and / or there are multiple first mounting parts, and they are arranged sequentially from top to bottom along the height direction of the main board.

6. A battery module, characterized in that, The battery assembly includes a battery module and at least one end plate as described in any one of claims 1 to 5, and the end plate is provided at at least one end of the battery module along its length.

7. A battery pack, characterized in that, It includes a housing and a battery module as described in claim 6; wherein the battery module is installed in the housing, and the first mounting part is detachably connected to the bottom wall of the housing through the first fastening member.

8. The battery pack according to claim 7, characterized in that, The inner bottom wall of the box has a second mounting part, and the second mounting part is detachably connected to the first mounting part through the first fastening member.

9. The battery pack according to claim 8, characterized in that, The second mounting part abuts against the first mounting part, which is located at the lowest point along the height direction of the main body.

10. The battery pack according to any one of claims 7 to 9, characterized in that, The housing includes an upper housing and a lower housing, both of which have flanges. The flanges of the upper housing and the lower housing are detachably connected by a second fastening member. The battery pack also includes a sealing ring, which is compressed between the flanges of the upper housing and the lower housing. And / or the outer wall of the housing has a lifting section with a lifting hole. The lifting section is a hollow shell structure formed by bending and assembling a flat plate, and an avoidance notch is formed on the side of the lifting section near the housing.

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