An end plate, a battery module, a battery device, and an electrical apparatus

Abstract

The utility model belongs to the battery field, especially, a kind of end plate, battery module, battery device and electric equipment are more particularly related to it.The utility model proposes an end plate to improve cell consistency and energy density, end plate includes end plate body and filler, weight reduction hole is equipped on end plate body, filler is used to fill in weight reduction hole, the density of filler is far less than the density of end plate body and immersion liquid.The utility model further proposes the battery module, battery device and electric equipment of application above-mentioned end plate.After the end plate is applied to battery device, filler can hinder the flow of immersion liquid and appropriately reduce the dosage of immersion liquid, reduce the cooling effect of immersion liquid on end plate, weaken the heat dissipation capacity of cell contacted with end plate, reduce the temperature difference of cell in middle part and end part of battery module, improve cell consistency, improve energy density and reduce the dosage of immersion liquid.

Description

Technical Field

[0001] This utility model belongs to the field of batteries, and in particular relates to an end plate, a battery module, a battery device and an electrical device. Background Technology

[0002] End plates are generally used to provide clamping force to the battery cells, thus limiting cell expansion. Originally, end plates were all solid, resulting in significant weight and consequently, a heavier battery module and battery pack. To reduce the weight of end plates, hollow end plates are now used.

[0003] For example, Chinese utility model patent CN220821804U, with an authorization announcement date of April 19, 2024, discloses an assembly structure for a battery module, a battery module, and a battery assembly. Specifically, this patent discloses an end plate, such as... Figure 1 As shown, the end plate (equivalent to the end plate body) is a hollow structure with a cavity that extends through the end plate along its height. Multiple reinforcing plates 5 are installed within the cavity to strengthen the end plate's structure. The reinforcing plates 5 and the cavity wall form multiple weight-reducing holes 4. The end plate also has conventional fixing holes 1, lifting holes 3, and structural mounting holes 2.

[0004] In the aforementioned end plate, the weight reduction hole 4 can effectively reduce the weight of the end plate, thereby reducing the weight of the battery module and battery pack.

[0005] However, when the aforementioned end plate is applied in an immersion battery pack (equivalent to a battery device), the immersion liquid will enter the weight reduction hole 4 and flow along the weight reduction hole 4. On the one hand, this will increase the amount of immersion liquid used. On the other hand, this will cause the immersion liquid to over-cool the end plate, resulting in the end plate temperature being too low. This will cause the end plate to over-cool the cells adjacent to the end plate, leading to a large temperature difference between the cells in the middle and at the end of the battery module and poor cell consistency. Utility Model Content

[0006] The purpose of this invention is to provide an end plate that solves the technical problems of poor cell consistency and low energy density when applied to battery devices.

[0007] The purpose of this invention is also to provide a battery module that can solve the technical problems of poor cell consistency and low energy density when applied to battery devices.

[0008] The purpose of this invention is also to provide a battery device to solve the technical problems of poor cell consistency and low energy density.

[0009] The purpose of this utility model is also to provide an electrical device to solve the technical problems of poor cell consistency and low energy density.

[0010] To achieve the above objectives, the technical solution for the end plate provided by this utility model is as follows: An end plate includes an end plate body with weight reduction holes and a filler for filling the weight reduction holes, the density of the filler being less than the density of the end plate body.

[0011] Furthermore, the weight-reducing holes are provided in multiple locations, and at least a portion of the weight-reducing holes are filled with the aforementioned filler.

[0012] Furthermore, the end plate body has a cavity, which extends through the end plate body in the height direction. The cavity is provided with multiple reinforcing plates to strengthen the structural strength of the end plate body. The reinforcing plates and the cavity wall form multiple first weight-reducing holes, which constitute the aforementioned weight-reducing holes.

[0013] Furthermore, the end plate body is also provided with lifting holes and structural mounting holes, and the first weight reduction hole, which is directly connected to the lifting hole or structural mounting hole, is not filled with the aforementioned filler.

[0014] Furthermore, in the thickness direction of the end plate body, a second weight-reducing hole is provided on the end face of the end plate body, which penetrates the end plate body and constitutes the aforementioned weight-reducing hole.

[0015] Furthermore, in the height direction of the end plate body, one end of the second weight-reducing hole extends to the bottom of the end plate body, and the width of the second weight-reducing hole near the bottom of the end plate body is not less than the width of the second weight-reducing hole away from the bottom of the end plate body; the hole wall of the second weight-reducing hole is provided with a groove for fixing the filler, and the filler is engaged and fixed with the groove.

[0016] Furthermore, the second weight-reducing hole is a rectangular hole, and the grooves are provided on the three walls of the second weight-reducing hole, and all the grooves together form a U-shaped groove.

[0017] Furthermore, the filler is elastic and fills the entire weight-reducing hole.

[0018] The beneficial effects of the end plate provided by this utility model are as follows: This utility model is an improved invention. The core difference between this utility model and the prior art is that, based on the existing weight-reduction holes, this utility model uses a filler to fill the weight-reduction holes.

[0019] After the end plate is applied to the battery device, the filler can reduce the amount of immersion liquid used and hinder the flow of immersion liquid, reduce the cooling effect of immersion liquid on the end plate, weaken the heat dissipation capacity of the cells in contact with the end plate, reduce the temperature difference between the cells in the middle and end of the battery module, and improve cell consistency and mass energy density.

[0020] To achieve the above objectives, the technical solution for the battery module provided by this utility model is as follows: A battery module includes an end plate and a battery cell. The end plate includes an end plate body with weight reduction holes. The end plate also includes a filler for filling the weight reduction holes, the density of which is less than the density of the end plate body.

[0021] Furthermore, the weight-reducing holes are provided in multiple locations, and at least a portion of the weight-reducing holes are filled with the aforementioned filler.

[0022] Furthermore, the end plate body has a cavity, which extends through the end plate body in the height direction. The cavity is provided with multiple reinforcing plates to strengthen the structural strength of the end plate body. The reinforcing plates and the cavity wall form multiple first weight-reducing holes, which constitute the aforementioned weight-reducing holes.

[0023] Furthermore, the end plate body is also provided with lifting holes and structural mounting holes, and the first weight reduction hole, which is directly connected to the lifting hole or structural mounting hole, is not filled with the aforementioned filler.

[0024] Furthermore, in the thickness direction of the end plate body, a second weight-reducing hole is provided on the end face of the end plate body, which penetrates the end plate body and constitutes the aforementioned weight-reducing hole.

[0025] Furthermore, in the height direction of the end plate body, one end of the second weight-reducing hole extends to the bottom of the end plate body, and the width of the second weight-reducing hole near the bottom of the end plate body is not less than the width of the second weight-reducing hole away from the bottom of the end plate body; the hole wall of the second weight-reducing hole is provided with a groove for fixing the filler, and the filler is engaged and fixed with the groove.

[0026] Furthermore, the second weight-reducing hole is a rectangular hole, and the grooves are provided on the three walls of the second weight-reducing hole, and all the grooves together form a U-shaped groove.

[0027] Furthermore, the filler is elastic and fills the entire weight-reducing hole.

[0028] The beneficial effects of the battery module provided by this utility model are as follows: This utility model is an improved invention. The core difference between this utility model and the prior art is that, based on the existing end plates which already have weight-reduction holes, this utility model uses a filler to fill the weight-reduction holes.

[0029] After the battery module is applied to the battery device, the filler can reduce the amount of immersion liquid used and hinder the flow of immersion liquid, reduce the cooling effect of immersion liquid on the end plate, weaken the heat dissipation capacity of the cells in contact with the end plate, reduce the temperature difference between the cells in the middle and end of the battery module, and improve cell consistency and mass energy density.

[0030] To achieve the above objectives, the technical solution of the battery device provided by this utility model is as follows: A battery device includes a battery housing and a battery module installed inside the battery housing. The battery housing is filled with an immersion liquid. The battery module includes an end plate and battery cells. The end plate includes an end plate body with weight reduction holes. The end plate also includes a filler for filling the weight reduction holes. The density of the filler is less than the density of the end plate body.

[0031] Furthermore, the weight-reducing holes are provided in multiple locations, and at least a portion of the weight-reducing holes are filled with the aforementioned filler.

[0032] Furthermore, the end plate body has a cavity, which extends through the end plate body in the height direction. The cavity is provided with multiple reinforcing plates to strengthen the structural strength of the end plate body. The reinforcing plates and the cavity wall form multiple first weight-reducing holes, which constitute the aforementioned weight-reducing holes.

[0033] Furthermore, the end plate body is also provided with lifting holes and structural mounting holes, and the first weight reduction hole, which is directly connected to the lifting hole or structural mounting hole, is not filled with the aforementioned filler.

[0034] Furthermore, in the thickness direction of the end plate body, a second weight-reducing hole is provided on the end face of the end plate body, which penetrates the end plate body and constitutes the aforementioned weight-reducing hole.

[0035] Furthermore, in the height direction of the end plate body, one end of the second weight-reducing hole extends to the bottom of the end plate body, and the width of the second weight-reducing hole near the bottom of the end plate body is not less than the width of the second weight-reducing hole away from the bottom of the end plate body; the hole wall of the second weight-reducing hole is provided with a groove for fixing the filler, and the filler is engaged and fixed with the groove.

[0036] Furthermore, the second weight-reducing hole is a rectangular hole, and the grooves are provided on the three walls of the second weight-reducing hole, and all the grooves together form a U-shaped groove.

[0037] Furthermore, the filler is elastic and fills the entire weight-reducing hole.

[0038] Furthermore, the density of the filler is less than the density of the immersion liquid.

[0039] The beneficial effects of the battery device provided by this utility model are as follows: This utility model is an improved invention. The core difference between this utility model and the prior art is that, based on the existing end plate already having weight-reduction holes, this utility model uses a filler to fill the weight-reduction holes.

[0040] When in use, the filler can reduce the amount of immersion liquid used and hinder the flow of immersion liquid, reduce the cooling effect of immersion liquid on the end plate, weaken the heat dissipation capacity of the cells in contact with the end plate, reduce the temperature difference between the cells in the middle and end of the battery module, and improve cell consistency and mass energy density.

[0041] Furthermore, the density of the filler is less than that of the immersion liquid, which can effectively reduce the mass of the battery device and increase the mass energy density.

[0042] To achieve the above objectives, the technical solution for the electrical equipment provided by this utility model is as follows: An electrical device includes a battery assembly, which includes a battery housing and a battery module installed inside the battery housing. The battery housing is filled with an immersion liquid. The battery module includes an end plate and battery cells. The end plate includes an end plate body with weight reduction holes. The end plate also includes a filler for filling the weight reduction holes, the density of which is less than the density of the end plate body.

[0043] Furthermore, the weight-reducing holes are provided in multiple locations, and at least a portion of the weight-reducing holes are filled with the aforementioned filler.

[0044] Furthermore, the end plate body has a cavity, which extends through the end plate body in the height direction. The cavity is provided with multiple reinforcing plates to strengthen the structural strength of the end plate body. The reinforcing plates and the cavity wall form multiple first weight-reducing holes, which constitute the aforementioned weight-reducing holes.

[0045] Furthermore, the end plate body is also provided with lifting holes and structural mounting holes, and the first weight reduction hole, which is directly connected to the lifting hole or structural mounting hole, is not filled with the aforementioned filler.

[0046] Furthermore, in the thickness direction of the end plate body, a second weight-reducing hole is provided on the end face of the end plate body, which penetrates the end plate body and constitutes the aforementioned weight-reducing hole.

[0047] Furthermore, in the height direction of the end plate body, one end of the second weight-reducing hole extends to the bottom of the end plate body, and the width of the second weight-reducing hole near the bottom of the end plate body is not less than the width of the second weight-reducing hole away from the bottom of the end plate body; the hole wall of the second weight-reducing hole is provided with a groove for fixing the filler, and the filler is engaged and fixed with the groove.

[0048] Furthermore, the second weight-reducing hole is a rectangular hole, and the grooves are provided on the three walls of the second weight-reducing hole, and all the grooves together form a U-shaped groove.

[0049] Furthermore, the filler is elastic and fills the entire weight-reducing hole.

[0050] Furthermore, the density of the filler is less than the density of the immersion liquid.

[0051] The beneficial effects of the electrical equipment provided by this utility model are as follows: This utility model is an improved invention. The core difference between this utility model and the prior art is that, based on the existing end plates which already have weight-reducing holes, this utility model uses a filler to fill the weight-reducing holes.

[0052] When in use, the filler can reduce the amount of immersion liquid used and hinder the flow of immersion liquid, reduce the cooling effect of immersion liquid on the end plate, weaken the heat dissipation capacity of the cells in contact with the end plate, reduce the temperature difference between the cells in the middle and end of the battery module, and improve cell consistency and mass energy density.

[0053] Furthermore, the density of the filler is lower than that of the immersion liquid, which can effectively reduce the mass of the battery device and increase its energy density. This can effectively improve the range of devices such as cars and drones. Attached Figure Description

[0054] Figure 1 This is a schematic diagram of the existing end plate structure; Figure 2 This is a schematic diagram of the structure of the end plate body of the end plate of this utility model; Figure 3 This is a top view of the end plate body of the end plate of this utility model; Figure 4 This is a schematic diagram of the filling material of the end plate of this utility model; Figure 5 This is a schematic diagram of the battery module of this utility model.

[0055] Explanation of reference numerals in the attached figures: Figure 1 In the middle: 1. Fixing holes; 2. Structural mounting holes; 3. Lifting holes; 4. Weight reduction holes; 5. Reinforcing plates; Figures 2-5 In the middle: 1. Fixing hole; 2. Structural mounting hole; 3. Lifting hole; 4. First weight reduction hole; 5. Reinforcing plate; 6. Second weight reduction hole; 7. Groove; 8. Filler; 9. End plate body. Detailed Implementation

[0056] To address the problems in the background technology, the core inventive concept of this utility model is: to fill the weight reduction hole with a filler with a density less than that of the end plate body, thereby reducing the amount of immersion liquid used, reducing the cooling effect of the immersion liquid on the end plate, weakening the heat dissipation capacity of the battery cell in contact with the end plate, reducing the temperature difference between the battery cells in the middle and end of the battery module, and improving the consistency of the battery cells and the mass energy density.

[0057] The present invention will be further described in detail below with reference to the embodiments.

[0058] Embodiments of the end plate provided by this utility model: In reference Figure 5 On the basis of, such as Figures 2-4 As shown, in a basic embodiment, the end plate includes an end plate body 9 and a filler 8. The end plate body 9 is provided with weight reduction holes, and the filler 8 is used to fill the weight reduction holes. The density of the filler 8 is less than the density of the end plate body 9.

[0059] The end plate body 9 is generally made of metal materials such as aluminum or stainless steel, while the filler 8 can be made of lightweight closed-cell foam material, such as 25x expanded MPP (Microcellular Polypropylene foam), which has a density of approximately 70 kg / m³. 3 Aluminum has a density of 2700 kg / m³. 3 The density of the immersion liquid is 900 kg / m³ 3 .

[0060] Compared to solid end plates made solely of metal, the end plates in this invention are lighter, which helps reduce the weight of the battery module and battery pack, and improves the mass energy density of the battery pack.

[0061] When the end plate is used in a battery device, the battery device includes a battery housing and a battery module installed inside the battery housing. The battery housing is filled with an immersion liquid, and the battery module includes an end plate and battery cells.

[0062] Filling the weight reduction holes with filler 8 with a density less than that of the end plate body 9 can hinder the flow of the immersion liquid at the end plate, reduce the cooling effect of the immersion liquid on the end plate, weaken the heat dissipation capacity of the cells in contact with the end plate, thereby reducing the temperature difference between the cells in the middle and end of the battery module and improving cell consistency.

[0063] At the same time, the filler 8 can also occupy a certain amount of space, thereby reducing the amount of immersion liquid used.

[0064] In some embodiments, there may be only one or two weight reduction holes, and each weight reduction hole is filled with filler material 8.

[0065] In other embodiments, multiple weight-reducing holes are provided, and some weight-reducing holes are filled with the filler 8, or all weight-reducing holes are filled with the filler 8.

[0066] Similar to existing technologies, the end plate body 9 also has fixing holes 1, lifting holes 3, and structural mounting holes 2. (Refer to...) Figure 5 On the basis of, such as Figure 2As shown, fixing hole 1 is used for bolts to pass through, so as to fix the end plate body 9 to the battery box with bolts to realize the fixing of the battery module; lifting hole 3 is used to cooperate with the lifting tool to move the battery module through the lifting tool and lifting hole 3 when needed; in the thickness direction of the end plate, the two ends of the cell group have end plates, and in the length direction of the end plate, the two ends of the cell group have side plates. The end plates and side plates are connected by rivets, and structural mounting hole 2 is used for rivets to pass through.

[0067] Of course, other existing methods can also be used to assemble the battery device. Fixing hole 1, lifting hole 3 and structural mounting hole 2 are all existing technologies and will not be described in detail here.

[0068] The following is a detailed explanation of the weight reduction hole.

[0069] exist Figures 2-4 In the embodiment shown, the weight reduction holes are divided into two types: first weight reduction hole 4 and second weight reduction hole 6.

[0070] The end plate body 9 has a cavity. In the height direction of the end plate body 9, the cavity penetrates the end plate body 9. Multiple reinforcing plates 5 are provided in the cavity to strengthen the structural strength of the end plate body 9. The reinforcing plates 5 and the cavity wall form multiple first weight reduction holes 4. In the thickness direction of the end plate body 9, a second weight reduction hole 6 is provided on the end face of the end plate body 9.

[0071] The number of cavities can be one, two, or more. Figure 2 (There are two in the middle).

[0072] For any given cavity, the arrangement of the reinforcing plate 5 is as follows: (1) Multiple reinforcing plates 5 inside the cavity can be arranged in parallel; (2) At least a portion of the reinforcing plates 5 are arranged at an angle, and the reinforcing plates 5 are connected end to end in sequence, such as Figure 3 As shown, except for the two reinforcing plates 5 at the ends, the remaining reinforcing plates 5 are arranged at an angle. At this time, the reinforcing plates 5 and the cavity wall form a stable triangular structure, which is beneficial to improving the structural strength of the end plates.

[0073] Of course, those skilled in the art can arrange the reinforcing plate 5 as needed, as long as the end plate has sufficient structural strength.

[0074] like Figures 2-4 As shown, in order to avoid interference between the rivets or lifting devices and the filler 8, in a preferred embodiment, the first weight-reducing hole 4, which is directly connected to the lifting hole 3 or the structural mounting hole 2, is not filled with the filler 8.

[0075] Of course, in other embodiments, all the first weight reduction holes 4 may be filled with the filler 8. For the first weight reduction holes 4 corresponding to the lifting holes 3 or structural mounting holes 2, clearance holes are provided on the filler 8 therein to avoid interference between the rivets or lifting devices and the filler 8.

[0076] In a preferred embodiment, such as Figure 2 As shown, in the height direction of the end plate body 9, one end of the second weight reduction hole 6 extends to the bottom of the end plate body 9, and the width of the second weight reduction hole 6 near the bottom of the end plate body 9 is not less than the width of the second weight reduction hole 6 away from the bottom of the end plate body 9; the hole wall of the second weight reduction hole 6 is provided with a groove 7 for fixing the filler 8, and the filler 8 is snapped and fixed with the groove 7.

[0077] Specifically, when the width of the second weight-reducing hole 6 near the bottom of the end plate body 9 is equal to the width of the second weight-reducing hole 6 away from the bottom of the end plate body 9, the width of the weight-reducing hole is always equal, and the weight-reducing hole is a rectangular hole; when the width of the second weight-reducing hole 6 near the bottom of the end plate body 9 is greater than the width of the second weight-reducing hole 6 away from the bottom of the end plate body 9, the width of the second weight-reducing hole 6 gradually decreases from the top to the bottom, and the weight-reducing hole can be a triangular hole, a trapezoidal hole, or an irregular hole.

[0078] exist Figure 2 In the illustrated embodiment, the second weight-reducing hole 6 is a rectangular hole, and the grooves 7 are provided on all three walls of the second weight-reducing hole 6, with all grooves 7 forming a U-shaped groove. Figure 4 As shown, the filler 8 corresponding to the second weight reduction hole 6 is a rectangular filler 8. The three sides of the rectangular filler 8 are stuck in the U-shaped groove to fix the rectangular filler 8.

[0079] Since one end of the second weight reduction hole 6 extends to the bottom of the end plate body 9, when the battery module is fixed on the battery box, the battery box is used to support the filler 8 in the second weight reduction hole 6 so as to better fix the filler 8 in the second weight reduction hole 6.

[0080] In other embodiments, when the second weight-reducing hole 6 does not include the groove 7, if the second weight-reducing hole 6 has an annular hole wall (i.e., the second weight-reducing hole 6 does not extend to the edge of the end plate body 9, for example, the second weight-reducing hole 6 is located in the middle of the end plate body 9), then after the filler 8 is filled into the second weight-reducing hole 6, there is a certain friction between the filler 8 and the hole wall of the second weight-reducing hole 6, so as to fix the filler 8; if one end of the second weight-reducing hole 6 extends to the bottom of the end plate body 9, the filler 8 can be fixed by means of adhesive or the like.

[0081] Regarding the filler 8 inside the first weight reduction hole 4, the filler 8 has a certain elasticity. After the filler 8 is filled into the first weight reduction hole 4, there is a certain friction between the filler 8 and the hole wall of the first weight reduction hole 4, so as to fix the filler 8.

[0082] In the above embodiments, the filler 8 fills the first weight-reducing hole 4 or the second weight-reducing hole 6. However, in other embodiments, the filler 8 may not fill the first weight-reducing hole 4 or the second weight-reducing hole 6. In this case, the filler 8 cannot be fixed by friction, so it is necessary to use adhesive or other methods to fix each filler 8. Of course, when the filler 8 is not elastic (for example, the filler 8 is a hard plastic), it is also necessary to use adhesive or other methods to fix the filler 8.

[0083] In other embodiments, the end plate body 9 may also be provided with only the first weight reduction hole 4 or the second weight reduction hole 6. In this case, the corresponding weight reduction hole may be completely filled with filler 8, or only part of the weight reduction hole (the first weight reduction hole 4 or the second weight reduction hole 6) may be filled with filler 8.

[0084] An embodiment of the battery module provided by this utility model: The battery module includes battery cells and end plates. The end plate can be any of the end plate embodiments in this example, and will not be described in detail here.

[0085] Embodiments of the battery device provided by this utility model: The battery device includes a battery housing and a battery module installed inside the battery housing. The battery housing is filled with an immersion fluid, and the battery module includes an end plate and battery cells. Any one of the battery modules described in the embodiments of this utility model is an example of a battery module, and will not be elaborated further here.

[0086] The immersion solution is a commonly used immersion solution in this field, such as electronic fluorinated liquid.

[0087] Preferably, in one embodiment, the density of the filler is less than the density of the immersion liquid.

[0088] For example, the density of 25x expanded MPP (Microcellular Polypropylene foam) is approximately 70 kg / m³. 3 The density of electronic fluorinated liquids is generally between 1700 and 1830 kg / m³. 3 between.

[0089] When the height of the immersion liquid is constant, the presence of filler 8 can reduce the amount of immersion liquid used. The more filler, the less immersion liquid is needed, thereby further reducing the mass of the battery device and increasing the mass energy density of the battery device.

[0090] Examples of electrical equipment provided by this utility model: The electrical equipment includes a battery device, which is any one of the battery devices in the embodiments of this utility model, thereby effectively reducing the weight of the electrical equipment and effectively improving its own endurance when the electrical equipment is a vehicle or drone.

[0091] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some technical features, or organically combine different embodiments to create the embodiments shown in the accompanying drawings. Of course, those skilled in the art can also create other embodiments not shown in the accompanying drawings. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An end plate, comprising an end plate body, wherein the end plate body is provided with weight-reducing holes, characterized in that, It also includes filler material for filling the weight reduction holes, the density of which is less than the density of the end plate body.

2. The end plate as described in claim 1, characterized in that, The weight reduction holes are provided in multiple ways, and at least a portion of the weight reduction holes are filled with the aforementioned filler.

3. The end plate as described in claim 2, characterized in that, The end plate body has a cavity. In the height direction of the end plate body, the cavity extends through the end plate body. The cavity is provided with multiple reinforcing plates to enhance the structural strength of the end plate body. The reinforcing plates and the cavity wall form multiple first weight-reducing holes, which constitute the aforementioned weight-reducing holes.

4. The end plate as described in claim 3, characterized in that, The end plate body is also provided with a lifting hole and a structural mounting hole, and the first weight reduction hole, which is directly connected to the lifting hole or the structural mounting hole, is not filled with the aforementioned filler.

5. The end plate as described in any one of claims 1 to 4, characterized in that, In the thickness direction of the end plate body, a second weight-reducing hole is provided on the end face of the end plate body, which is a weight-reducing hole.

6. The end plate as described in claim 5, characterized in that, In the height direction of the end plate body, one end of the second weight reduction hole extends to the bottom of the end plate body, and the width of the second weight reduction hole near the bottom of the end plate body is not less than the width of the second weight reduction hole away from the bottom of the end plate body; the hole wall of the second weight reduction hole is provided with a groove for fixing the filler, and the filler is engaged and fixed with the groove.

7. The end plate as described in claim 6, characterized in that, The second weight-reducing hole is a rectangular hole, and the grooves are provided on the three walls of the second weight-reducing hole. All the grooves together form a U-shaped groove.

8. The end plate as described in any one of claims 1-4 and 6-7, characterized in that, The filler is elastic and fills the entire weight reduction hole.

9. A battery module, comprising an end plate and battery cells, characterized in that, The end plate is the end plate described in any one of claims 1 to 8.

10. A battery device comprising a battery housing and a battery module mounted within the battery housing, the battery housing being filled with an immersion liquid, characterized in that, The battery module is the battery module as described in claim 9.

11. The battery device as claimed in claim 10, characterized in that, The density of the filler is less than the density of the immersion liquid.

12. An electrical appliance, characterized in that, Includes the battery device according to any one of claims 10-11.

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