Battery module and battery pack

Abstract

The utility model belongs to battery technical field discloses a kind of battery module and battery pack.Battery module includes bottom plate, first electric core component, second electric core component, first end plate, middle plate and second end plate, first electric core component is placed on bottom plate upside, and first electric core component includes M electric core being arranged side by side along first direction;First electric core component is clamped between the first side of first end plate and middle plate;Second electric core component is placed on bottom plate upside, and second electric core component includes N electric core being arranged side by side along first direction;Second electric core component is clamped between the second side of second end plate and middle plate, and first end plate, middle plate and second end plate are connected with bottom plate.The battery module and battery pack do not need to use heat-conducting structural adhesive, can fix electric core, facilitate the maintenance of single electric core.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery module and a battery pack. Background Technology

[0002] As the energy storage industry places increasingly higher demands on the energy density and space utilization of battery packs, large module solutions are now commonly used for energy storage battery pack integration. This reduces the number of internal components and improves the space utilization and energy density of the battery pack.

[0003] Currently, when manufacturers adopt large module designs, they generally use structural adhesive to bond the bottom of the module to the base plate. This method connects the module and the base plate into a whole, enhancing the overall structural strength. However, this method lacks maintainability in the later stages, and individual cells or modules cannot be removed separately when they need to be replaced, resulting in high maintenance costs.

[0004] Therefore, there is an urgent need to design a battery module and battery pack to solve the above problems. Utility Model Content

[0005] One objective of this invention is to provide a battery module that can fix the battery cells without the use of thermally conductive structural adhesive, thereby facilitating the maintenance of individual battery cells and reducing maintenance costs.

[0006] Another objective of this invention is to provide a battery pack that makes individual cell maintenance more convenient and reduces maintenance costs.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] Battery module, including:

[0009] Base plate;

[0010] The first battery cell assembly is placed on the upper side of the aforementioned base plate, and the first battery cell assembly includes M battery cells arranged side by side along a first direction;

[0011] The first end plate and the middle plate, the first cell assembly is sandwiched between the first end plate and the first side of the middle plate, and the first end plate and the middle plate are respectively connected to the bottom plate.

[0012] The second battery cell assembly is placed on the upper side of the aforementioned base plate, and the second battery cell assembly includes N battery cells arranged side by side along the first direction;

[0013] The second end plate is connected to the bottom plate, and the second cell assembly is sandwiched between the second end plate and the second side of the intermediate plate.

[0014] As an optional solution, the aforementioned base plate includes:

[0015] The body, the first battery cell assembly and the second battery cell assembly are placed on the body;

[0016] A connecting protrusion is provided on the upper side of the main body. The connecting protrusion is provided below the first end plate, the second end plate, and the intermediate plate. The first end plate, the second end plate, and the intermediate plate are all connected to the corresponding connecting protrusion.

[0017] As an alternative, the first end plate, the intermediate plate, and the second end plate are all connected to the base plate by long bolts. The long bolts pass through the first end plate, the intermediate plate, or the second end plate and are threadedly connected to the corresponding connecting protrusions.

[0018] As an optional solution, in the second direction, at least two of the aforementioned long bolts are provided at intervals corresponding to the first end plate; and / or

[0019] In the second direction, at least two of the aforementioned long bolts are provided at intervals corresponding to the second end plate; and / or

[0020] In the second direction, at least two of the aforementioned long bolts are provided at intervals corresponding to the aforementioned intermediate plate, and the aforementioned second direction is perpendicular to the aforementioned first direction.

[0021] As an alternative, the connecting protrusions extend along a second direction, each of the connecting protrusions being used to connect with at least two corresponding long bolts, the second direction being perpendicular to the first direction; or

[0022] The aforementioned long bolts are connected one-to-one with the aforementioned connecting protrusions.

[0023] As an alternative, the two aforementioned battery cells located on both sides of the aforementioned intermediate plate are connected by a connecting outlet, and the top of the aforementioned long bolt is covered with an insulating cap.

[0024] As an optional solution, protective components are provided on the corresponding sides of the battery cell that are attached to the first end plate, the second end plate, and the intermediate plate.

[0025] As an optional solution, the aforementioned protective components include:

[0026] The protective part has one side attached to the large surface of the battery cell and the other side attached to the first end plate, the intermediate plate or the second end plate.

[0027] Three fitting parts are respectively connected to the three sides of the above-mentioned protective part, and a number of reinforcing protrusions are provided on the two fitting parts opposite to each other in the second direction, the second direction being perpendicular to the first direction.

[0028] As an alternative, M = N; and / or

[0029] M≥8 and N≥8.

[0030] As an optional solution, the first battery cell assembly, the second battery cell assembly, the first end plate, the second end plate, and the intermediate plate are arranged in a corresponding manner and at least two sets are arranged in the second direction, which is perpendicular to the first direction.

[0031] As an optional solution, the first end plate, the first cell assembly, the intermediate plate, the second cell assembly, and the second end plate are all fitted with straps.

[0032] As an alternative, in the third direction, the aforementioned strap intervals are set to at least two, and the aforementioned third direction is perpendicular to the aforementioned first direction.

[0033] As an optional solution, the distance between the first end plate and the intermediate plate is L1, the width of the battery cell is L2, the distance between the second end plate and the intermediate plate is L3, L1 / L2≥3.3, and / or L1 / L3≥3.3.

[0034] As an alternative, the base plate mentioned above is a cold-rolled steel plate.

[0035] As an alternative, the top surface height of the aforementioned intermediate plate is lower than the top surface height of the aforementioned battery cell.

[0036] The battery pack includes the aforementioned battery module and frame, wherein the battery module is housed within the aforementioned frame.

[0037] The beneficial effects of this utility model are as follows:

[0038] This utility model provides a battery module that shortens the length of each battery cell assembly (either the first or second battery cell assembly) by adding an intermediate plate between the first and second battery cell assemblies. The intermediate plate and the first end plate clamp the first battery cell assembly, and the intermediate plate and the second end plate clamp the second battery cell assembly. Compared to a longer module, this shortens the length of each battery cell assembly. The first end plate, intermediate plate, and second end plate are locked to the base plate to ensure the strength of the battery cell. Even without using thermally conductive structural adhesive, the first and second battery cell assemblies can be fixed. If a battery cell has a problem, it can be easily removed, reducing maintenance costs.

[0039] This utility model also provides a battery pack, including the aforementioned battery module and a frame, with the battery module housed within the frame. By employing the aforementioned battery module, the battery pack makes individual cell maintenance more convenient and reduces maintenance costs. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structure of the battery module provided in this embodiment of the utility model;

[0041] Figure 2 This is a partial structural diagram of the battery module at the middle plate position provided in this embodiment of the utility model.

[0042] In the picture:

[0043] 10. Base plate; 11. Connecting protrusion; 20. First cell assembly; 30. Second cell assembly; 40. First end plate; 50. Second end plate; 60. Intermediate plate; 70. Cell; 71. Connecting bar; 80. Long bolt; 91. Insulating cap; 92. Protective component; 921. Protective part; 922. Fitting part; 9221. Reinforcing protrusion; 93. Binding strap. Detailed Implementation

[0044] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0045] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0046] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0047] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0048] This embodiment provides a battery module that can fix the battery cell 70 without the use of thermally conductive structural adhesive, facilitating the maintenance of individual battery cells 70 and reducing maintenance costs. Figure 1 and Figure 2 As shown, the battery module includes a base plate 10, a first cell assembly 20, a second cell assembly 30, a first end plate 40, an intermediate plate 60, and a second end plate 50. The first cell assembly 20 is placed on the upper side of the base plate 10 and includes M cells 70 arranged side by side along a first direction (X direction in the figure). The first cell assembly 20 is sandwiched between the first end plate 40 and the first side of the intermediate plate 60. The second cell assembly 30 is placed on the upper side of the base plate 10 and includes N cells 70 arranged side by side along the first direction. The second cell assembly 30 is sandwiched between the second end plate 50 and the second side of the intermediate plate 60. The first end plate 40, the intermediate plate 60, and the second end plate 50 are all connected to the base plate 10.

[0049] The aforementioned battery module, by adding an intermediate plate 60 between the first cell assembly 20 and the second cell assembly 30, clamps the first cell assembly 20 with the first end plate 40, and clamps the second cell assembly 30 with the second end plate 50. Compared to a longer module, this shortens the length of each cell assembly (referring to the first cell assembly 20 or the second cell assembly 30). The module is secured to the base plate 10 with long bolts 80 to ensure the strength of the cell 70. The first cell assembly 20 and the second cell assembly 30 are then fixed together with straps 93. Even without using thermally conductive structural adhesive, the first cell assembly 20 and the second cell assembly 30 can be fixed. If a cell 70 has a problem, it can be easily removed, reducing maintenance costs.

[0050] Optionally, the first end plate 40, the first cell assembly 20, the intermediate plate 60, the second cell assembly 30, and the second end plate 50 are fitted with binding straps 93. This arrangement binds all parts on the base plate 10 together, working in conjunction with the first end plate 40, the intermediate plate 60, and the second end plate 50 to further increase the clamping force between the cells 70 of the first cell assembly 20 and the second cell assembly 30, preventing the middle cell 70 from easily detaching from the side.

[0051] Optionally, M ≥ 8 and N ≥ 8. It is understood that within this range, the battery module is relatively long in the first direction. That is, for longer modules, existing technologies only use two end plates, resulting in two lifting positions. This embodiment adds a middle plate 60, allowing for additional lifting positions on the top of the middle plate 60 during battery module lifting, reducing the span of the lifting holes, simplifying the module lifting method, and improving the stability and safety of the module during lifting. Simultaneously, the module is divided into two parts (i.e., the first cell assembly 20 and the second cell assembly 30) for locking, which reduces the requirements for the flatness of the module's bottom and the local flatness of the base plate 10, avoiding increased manufacturing costs due to excessively high precision requirements.

[0052] Optionally, such as Figure 1 As shown, the distance between the first end plate 40 and the middle plate 60 is L1, the width of the cell 70 is L2, and the distance between the second end plate 50 and the middle plate 60 is L3. L1 / L2 ≥ 3.3, and / or L1 / L3 ≥ 3.3. In this embodiment, when M = N = 8, the width of a single cell 70 is 71.5 mm, and the length of a single cell 70 is 175 mm. Therefore, L1 / L2 = L1 / L3 = 3.3, and the lower limit of the ratio is 3.3.

[0053] Optionally, M=N, which can increase the symmetry of the hoisting during the transfer of the entire module, and at the same time ensure that the force between each cell 70 component is relatively balanced.

[0054] In this embodiment, M = N = 13. In other embodiments, the values ​​of M and N can be adjusted adaptively according to the situation, and are not limited here.

[0055] Optionally, the base plate 10 can be a liquid cooling plate, that is, the base plate 10 integrates the function of heat exchange with the battery module. The structural adhesive can be selected as a thermally conductive structural adhesive, which can increase the heat exchange area between the liquid cooling plate and the battery module, and can also bond and fix the battery module to the liquid cooling plate.

[0056] Of course, in other embodiments, the base plate 10 can also be a plate structure that is simply used to support the battery module. In this case, liquid cooling plates can be arranged on the side or top of the battery module, which is not limited here.

[0057] Optionally, such as Figure 1 and Figure 2As shown, the base plate 10 includes a body and a connecting protrusion 11. The first battery cell assembly 20 and the second battery cell assembly 30 are placed on the body. The connecting protrusion 11 protrudes from the upper side of the body. Connecting protrusions 11 are also provided below the first end plate 40, the second end plate 50, and the intermediate plate 60. The first end plate 40, the second end plate 50, and the intermediate plate 60 are all connected to the corresponding connecting protrusions 11. Through the above arrangement, the height of the connecting protrusion 11 is sufficient to ensure the connection strength.

[0058] Optionally, the first end plate 40, the intermediate plate 60, and the second end plate 50 are all connected to the base plate 10 by long bolts 80. The long bolts 80 pass through the first end plate 40, the intermediate plate 60, or the second end plate 50 and are threadedly connected to the corresponding connecting protrusions 11. With the above arrangement, the first end plate 40, the intermediate plate 60, and the second end plate 50 can be more securely fixed to the corresponding connecting protrusions 11.

[0059] Optionally, in the second direction, at least two long bolts 80 are spaced apart corresponding to the first end plate 40; in the second direction (Y direction in the figure, X direction is perpendicular to Y direction), at least two long bolts 80 are spaced apart corresponding to the second end plate 50; and in the second direction, at least two long bolts 80 are spaced apart corresponding to the intermediate plate 60. The above arrangement can improve the strength of the connection between the first end plate 40, the second end plate 50, and the intermediate plate 60 and the base plate 10. Optionally, two long bolts 80 are provided in the second direction; in other embodiments, three or more may be provided, which is not limited here.

[0060] In this embodiment, as Figure 1 and Figure 2 As shown, the connecting protrusion 11 extends along the second direction, and each connecting protrusion 11 is used to connect with at least two corresponding long bolts 80; thus, the connecting protrusion 11 is elongated, which makes it easier to obtain materials and manufacture. Optionally, the connecting protrusion 11 is connected to the upper side of the base plate 10 by screws.

[0061] In another embodiment, the long bolts 80 are connected to the connecting protrusions 11 in a one-to-one correspondence. For example, if two long bolts 80 are respectively inserted into the first end plate 40, then two connecting protrusions 11 are provided on the lower side of the first end plate 40. The intermediate plate 60 and the second end plate 50 will not be described in detail here.

[0062] Optionally, such as Figure 2 As shown, the two battery cells 70 located on both sides of the intermediate plate 60 are electrically connected by a connecting strip 71, and the top of the long bolt 80 is covered with an insulating cap 91 (in... Figure 1 (As shown in the image). These settings prevent poor insulation caused by insufficient electrical clearance or creepage distance.

[0063] Optionally, the connecting row 71 is made of aluminum, which can not only ensure good electrical conductivity but also ensure the lightweight design of the battery module.

[0064] Optionally, as Figure 2 shown, the connecting row 71 is in a U-shaped configuration, that is, a structure with a convex middle, so that it can form a better avoidance with the long bolt 80. At the same time, the U-shaped structure can make the entire connecting row 71 have a certain amount of elastic deformation in the horizontal direction, enabling fine adjustment during the welding of the connecting row 71, thereby adapting to the position deviation of the poles of the two battery cells 70.

[0065] It should be noted that a connecting row 71 is provided between the two battery cells 70 on both sides of the middle plate 60, and a connecting row 71 is also provided between two adjacent battery cells 70 within the first battery cell assembly 20 or the second battery cell assembly 30. The lengths of the two types of connecting rows 71 are different. The connecting row 71 in the former case needs to be customized to be slightly longer to adapt to the setting of the middle plate 60.

[0066] Optionally, the top surface height of the middle plate 60 is lower than the top surface height of the battery cell 70, creating an avoidance space for the upper connecting row 71, so that after the long bolt 80 is connected, there is still sufficient insulation distance from the connecting row 71.

[0067] Optionally, as Figure 1 and Figure 2 shown, protective members 92 are provided on the corresponding sides of the battery cells 70 that are in contact with the first end plate 40, the second end plate 50, and the middle plate 60. This can prevent the end faces of the battery cells 70 adjacent to the first end plate 40, the second end plate 50, and the middle plate 60 from being easily deformed due to extrusion.

[0068] Optionally, as Figure 2 shown, the protective member 92 includes a protective portion 921 and three fitting portions 922. One side of the protective portion 921 is in contact with the large surface of the battery cell 70, and the other side is in contact with the first end plate 40, the middle plate 60, or the second end plate 50. The three fitting portions 922 are respectively connected to the three sides of the protective portion 921, and a number of reinforcing protrusions 9221 are provided on two fitting portions 922 that are opposite in the second direction. It can be understood that since the overall protective portion 921 is relatively thin, adding the reinforcing protrusions 9221 on the fitting portions 922 can improve the strength of the corresponding fitting portions 922. In this embodiment, four reinforcing protrusions 9221 are provided at intervals. In other embodiments, the number of reinforcing protrusions 9221 can be flexibly adjusted according to the situation and is not limited herein.

[0069] Optionally, at least two straps 93 are spaced apart in three directions (Z direction, X direction, Y direction, and pairs of perpendicular Z directions in the figure) to increase the stability of the battery module being wrapped. In this embodiment, two straps 93 are provided, which can ensure the strength of the wrapping without causing the area of ​​the battery cell 70 to be covered too large, thus avoiding the problem of poor heat dissipation of the battery cell 70.

[0070] Optionally, the first cell assembly 20, the second cell assembly 30, the first end plate 40, the second end plate 50, and the intermediate plate 60 are arranged in a one-to-one correspondence and at least two sets are arranged in the second direction. In this embodiment, three sets are provided ( Figure 1 (Only one group is shown in this example.) In other embodiments, two, four, or more groups may be set, which is not limited here.

[0071] This embodiment also provides a battery pack, including the aforementioned battery module and a frame, with the battery module housed within the frame. By employing the aforementioned battery module, the battery pack makes maintenance of individual cells 70 more convenient and reduces maintenance costs.

[0072] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery module, characterized by, include: Base plate (10); The first battery cell assembly (20) is placed on the upper side of the base plate (10). The first battery cell assembly (20) includes M battery cells (70) arranged side by side along a first direction. The first end plate (40) and the middle plate (60) are provided, and the first cell assembly (20) is sandwiched between the first end plate (40) and the middle plate (60) on the first side. The first end plate (40) and the middle plate (60) are respectively connected to the bottom plate (10). The second battery cell assembly (30) is placed on the upper side of the base plate (10). The second battery cell assembly (30) includes N battery cells (70) arranged side by side along the first direction. The second end plate (50) is connected to the bottom plate (10), and the second cell assembly (30) is sandwiched between the second end plate (50) and the second side of the intermediate plate (60).

2. The battery module of claim 1, wherein, The base plate (10) includes: The first battery cell assembly (20) and the second battery cell assembly (30) are placed on the body; A connecting protrusion (11) is provided on the upper side of the body. The connecting protrusion (11) is provided below the first end plate (40), the second end plate (50) and the middle plate (60). The first end plate (40), the second end plate (50) and the middle plate (60) are all connected to the corresponding connecting protrusion (11).

3. The battery module of claim 2, wherein, The first end plate (40), the intermediate plate (60) and the second end plate (50) are all connected to the base plate (10) by long bolts (80). The long bolts (80) pass through the first end plate (40), the intermediate plate (60) or the second end plate (50) and are threadedly connected to the corresponding connecting protrusions (11).

4. The battery module of claim 3, wherein, In the second direction, at least two of the long bolts (80) are provided at intervals corresponding to the first end plate (40); and / or In the second direction, at least two of the long bolts (80) are spaced apart corresponding to the second end plate (50); and / or In the second direction, at least two of the long bolts (80) are spaced apart corresponding to the intermediate plate (60), and the second direction is perpendicular to the first direction.

5. The battery module of claim 3, wherein, The connecting protrusion (11) extends along a second direction, and each connecting protrusion (11) is used to connect with at least two corresponding long bolts (80), the second direction being perpendicular to the first direction; or The long bolts (80) are connected one-to-one with the connecting protrusions (11).

6. The battery module of any one of claims 3-5, wherein, The two cells (70) located on both sides of the intermediate plate (60) are electrically connected by a connecting bar (71), and the top of the long bolt (80) is covered with an insulating cap (91).

7. The battery module of any one of claims 1-5, wherein, Protective components (92) are provided on the corresponding sides of the battery cell (70) that are in contact with the first end plate (40), the second end plate (50) and the intermediate plate (60).

8. The battery module of claim 7, wherein, The protective component (92) includes: The protective part (921) is attached to the large surface of the battery cell (70) on one side and to the first end plate (40), the intermediate plate (60) or the second end plate (50) on the other side. Three fitting portions (922) are respectively connected to the three sides of the protective portion (921). Several reinforcing protrusions are provided on the two fitting portions (922) that are opposite each other in the second direction. The second direction is perpendicular to the first direction.

9. The battery module of any one of claims 1-5, wherein, M = N; and / or M≥8 and N≥8.

10. The battery module of any one of claims 1-5, wherein, The first cell assembly (20), the second cell assembly (30), the first end plate (40), the second end plate (50) and the intermediate plate (60) are arranged in a one-to-one correspondence and at least two sets are arranged in the second direction, which is perpendicular to the first direction.

11. The battery module of any one of claims 1-5, wherein, The first end plate (40), the first cell assembly (20), the intermediate plate (60), the second cell assembly (30) and the second end plate (50) are covered with straps (93).

12. The battery module of claim 11, wherein, In the third direction, at least two straps (93) are spaced apart, and the third direction is perpendicular to the first direction.

13. The battery module of any one of claims 1-5, wherein, The distance between the first end plate (40) and the intermediate plate (60) is L1, the width of the cell (70) is L2, the distance between the second end plate (50) and the intermediate plate (60) is L3, L1 / L2≥3.3, and / or L1 / L3≥3.

3.

14. The battery module of any one of claims 1-5, wherein, The base plate (10) is a cold plate.

15. The battery module of any one of claims 1-5, wherein, The top surface height of the intermediate plate (60) is lower than the top surface height of the battery cell (70).

16. A battery pack, characterized by It includes the battery module and frame as described in any one of claims 1-15, wherein the battery module is housed within the frame.

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