Battery modules and battery packs
By setting a fixed area and a buffer zone on the solid-state battery casing, the problem of the solid-state battery's expansion and deformation affecting the installation strength is solved, and a stable connection between the battery and the mounting plate is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CALB GROUP CO LTD
- Filing Date
- 2025-08-15
- Publication Date
- 2026-07-03
AI Technical Summary
Solid-state batteries are prone to expansion and deformation during use, which can affect the installation strength with other components.
The solid-state battery casing is designed with a fixed area and a buffer area. The fixed area is connected to the mounting plate, and the buffer area absorbs casing deformation. The buffer area can dynamically deform to absorb the deformation when the battery cell expands.
The deformation of the buffer zone absorbs the deformation of the casing, ensuring the connection stability between the solid-state battery and the mounting plate and avoiding the impact of expansion deformation on the fixed area.
Smart Images
Figure CN224458261U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of batteries, and specifically proposes a battery module and a battery pack. Background Technology
[0002] Solid-state batteries use solid electrolytes, which have higher energy density, better safety, and longer cycle life compared to traditional batteries containing liquid electrolytes.
[0003] However, solid-state batteries are prone to expansion and deformation during use, which can affect the installation strength between the solid-state battery and other components. Utility Model Content
[0004] The purpose of this application is to solve at least some of the technical problems mentioned above, and this purpose is achieved through the following technical solutions:
[0005] One aspect of this application provides a battery module, which includes a mounting plate and a solid-state battery; wherein the solid-state battery includes a housing and a cell disposed inside the housing, the housing has a first surface, the first surface is provided with a fixing area and a buffer area, the fixing area is connected to the mounting plate, and the buffer area can absorb the deformation of the housing.
[0006] Another aspect of this application provides a battery pack including the aforementioned battery module.
[0007] The technical solution proposed in this application has at least the following technical effects:
[0008] In the above technical solution, the solid-state battery cell has a fixed area for connecting with the mounting plate and a buffer zone to absorb the deformation of the casing. When the battery cell is heated and expands, the buffer zone on the casing will deform accordingly, thereby avoiding the impact on the fixed area and ensuring the stability of the connection between the solid-state battery and the mounting plate. Attached Figure Description
[0009] To better integrate the content illustrated in the accompanying drawings with the description of the specific embodiments, a brief introduction to the drawings is provided below. It is understood that the accompanying drawings mentioned below are merely schematic illustrations of some embodiments of the relevant technical solutions and the technical solutions of this application. Without creative effort, those skilled in the art can create drawings illustrating other embodiments.
[0010] Specifically, the annotations for the accompanying drawings are as follows:
[0011] Figure 1 This is a schematic diagram of the structure of a solid-state battery as described in some embodiments of this application;
[0012] Figure 2 for Figure 1An enlarged schematic diagram of point A in the diagram.
[0013] Specifically, the annotations for the figure marks in the instruction manual are as follows:
[0014] 10. Shell; 101. First surface; 102. Second surface; 1011. Fixed area; 1012. Buffer zone; X. First direction. Detailed Implementation
[0015] To make the embodiments of this application clearer, they will be described below in conjunction with the accompanying drawings. It should be understood that the content mentioned below represents only some embodiments of this application, and not all embodiments are listed exhaustively. Therefore, other embodiments that can be obtained based on the following embodiments without any inventive effort fall within the protection scope of this application.
[0016] It should be understood that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to impose strict limitations on the technical solutions unless the context clearly indicates otherwise. For example, the use of "a," "an," and "the" to modify a feature does not preclude the possibility that the feature may be plural in other embodiments.
[0017] It should be understood that the terms "comprising," "including," and "having" are open-ended, indicating the presence of the stated features but not excluding the possibility of other features in the embodiment. Similarly, the use of terms such as "first," "second," etc., to describe multiple features only indicates the distinction between one feature and another, and such terms do not imply order or sequence unless explicitly stated in the context.
[0018] It should be understood that, unless the context clearly indicates otherwise, the terms "setup," "connection," and "installation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integrated connection; they can refer to a direct connection or an indirect connection via a medium. Those skilled in the art will understand the specific meaning of these terms in this document based on the specific circumstances.
[0019] In addition, for ease of description, the text will use terms of spatial relative relationship to describe the position of one feature relative to another feature, such as "inner", "outer", "end", "side", "upper", "middle", "lower", "high", "low", "axial", "circumferential", "radial", "horizontal", "vertical", "first direction", "second direction", etc. It can be understood that the spatial relative relationship between two features should include other specific situations besides those shown in the accompanying drawings of the specification.
[0020] The embodiments of this application are described below with reference to the accompanying drawings. It can be understood that the technical features involved in the different embodiments described below can be combined with each other as long as they do not conflict with each other.
[0021] Firstly, referring to Figure 1 and Figure 2 The embodiments of this application propose a battery module, which includes a mounting plate and a solid-state battery; wherein, the solid-state battery includes a housing 10 and a cell disposed inside the housing 10. The housing 10 has a first surface 101, the first surface 101 is provided with a fixing area 1011 and a buffer area 1012, the fixing area 1011 is connected to the mounting plate, and the buffer area 1012 can absorb the deformation of the housing 10.
[0022] In this embodiment, the housing 10 of the solid-state battery cell is provided with a fixing area 1011 for connection with the mounting plate, and a buffer zone 1012 is provided to absorb the deformation of the housing 10. When the battery cell is heated and expands, the buffer zone 1012 on the housing 10 will deform accordingly, thereby avoiding the impact on the fixing area 1011 and ensuring the stability of the connection between the solid-state battery and the mounting plate.
[0023] It should be noted that the deformation of the housing 10 may be caused by a large amount of gas generated by the battery cell inside the housing 10 or by the deformation of the battery cell squeezing the housing.
[0024] In some embodiments, refer to Figure 1 The fixed area 1011 and the buffer area 1012 are arranged side by side along the first direction X, and the size of the fixed area 1011 is L1 and the size of the buffer area 1012 is L2 along the first direction X, and the condition 0.75≤L1 / L2≤18 is satisfied.
[0025] In this embodiment, the ratio of the dimensions of the fixed area 1011 to the buffer area 1012 along the first direction X should be appropriate, that is, L1 / L2 should be appropriate. If the ratio is too large, the buffer area 1012 will be too small, making it difficult to effectively absorb the deformation of the housing 10, which will pull on the fixed area 1011 and affect the connection between the solid-state battery and the mounting plate. If L1 / L2 is too small, that is, the size of the fixed area 1011 is too small, the contact area between the solid-state battery and the mounting plate will be reduced, directly affecting the connection effect between the two. Therefore, L1 / L2 should be appropriate. For example, L1 / L2 can be any one of 0.75, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17 and 18 or within any two of these values.
[0026] Optionally, along the first direction X, the size L1 of the fixed area 1011 satisfies 7.5mm≤L1≤45mm, for example, it can take any one of 7.5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm and 45mm or be within the range of any two of these values; and / or, along the first direction X, the size L2 of the buffer zone 1012 satisfies 2.5mm≤L2≤10mm, for example, it can take any one of 2.5mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm and 10mm or be within the range of any two of these values.
[0027] In some embodiments, refer to Figure 1 and Figure 2 The buffer 1012 includes two sub-buffers 1012, which are symmetrically arranged on both sides of the fixed area 1011 along the first direction X.
[0028] In this embodiment, the fixed area 1011 is located between two sub-buffer zones 1012. That is, the fixed area 1011 can absorb the deformation of the housing 10 through the sub-buffer zones 1012 on both sides along the first direction X, so that the overall deformation of the housing 10 is more uniform and further avoids affecting the connection between the fixed area 1011 and the mounting plate.
[0029] Specifically, the two sub-buffer zones 1012 are symmetrically distributed and their dimensions along the first direction X are equal, that is, (1 / 2)L2, which makes the overall deformation of the shell 10 more uniform.
[0030] In some embodiments, refer to Figure 1 and Figure 2 The fixed area 1011 has a planar structure, which is bonded or welded to the mounting plate.
[0031] In this embodiment, the fixing area 1011 is a planar structure, which facilitates the connection operation with the mounting plate. Specifically, the planar structure can be bonded to the mounting plate by adhesive layer, ultrasonic welding, laser welding, etc. Of course, other connection methods can also be adopted.
[0032] In some embodiments, refer to Figure 2 The buffer zone 1012 includes alternating protrusions and grooves, which constitute a deformable portion.
[0033] In this embodiment, a specific implementation of the buffer 1012 is proposed, in which the protrusions and grooves form a deformable part with a pleated shape, thereby having redundancy and being able to absorb the deformation of the shell 10, which is a reasonable design.
[0034] It should be noted that the deformable part of the buffer 1012 can change dynamically and reversibly. That is, when the solid-state battery is heated and expands, the buffer 1012 absorbs the deformation and becomes flat. When the temperature cools down, the buffer 1012 returns to the wrinkled state.
[0035] In some embodiments, the deformation amount of the deformable part is δ, and satisfies 0.35mm≤δ≤4.5mm.
[0036] In this embodiment, the deformation amount δ of the deformable part cannot be too large, otherwise it will occupy too much space and affect the energy density of the battery pack; at the same time, δ cannot be too small, otherwise it will be difficult to effectively absorb the deformation of the housing 10, affecting the connection between the fixing area 1011 and the mounting plate. Therefore, δ should be moderate. For example, δ can be any one of 0.35mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm and 4.5mm or within the range of any two of these values.
[0037] It should be noted that the maximum deformation of the deformable part is in the flattened state. Taking the protrusion as an example, its deformation δ is the height of the protrusion.
[0038] In some embodiments, refer to Figure 1 The shell 10 also has a second surface 102, which is adjacent to the first surface 101, and the area of the second surface 102 is larger than the area of the first surface 101; the deformation rate of the first surface 101 is d1, the deformation rate of the second surface 102 is d2, and the condition 0.01≤d1-d2≤0.45 is satisfied.
[0039] In this embodiment, the difference in deformation rate between the first surface 101 and the second surface 102 should be moderate, that is, d1-d2 should be moderate. For example, d1-d2 can take any one of 0.01, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4 and 0.45 or be within the range of any two of these values.
[0040] Specifically, the deformation rate here refers to the difference between the area of the surface after deformation and the area before deformation, divided by the area before deformation.
[0041] It should be noted that during the production design, efforts should be made to ensure that the second surface 102 does not deform. Otherwise, it will lead to uneven pressure between the two adjacent solid-state batteries, causing problems with interface contact and affecting the cycle performance. In other words, the deformation should be minimized on the first surface 101 to ensure that the second surface 102 is not affected. This means that d1 is greater than 0 and d2 is close to 0. However, in reality, d1 is a value less than 1. Therefore, 0.01≤d1-d2≤0.45 is a more suitable range.
[0042] In some embodiments, the hardness of the housing 10 is H, and satisfies 20HV≤H≤280HV.
[0043] In this embodiment, the hardness of the shell 10 should be moderate. If the hardness is too high, the buffer zone 1012 will have difficulty absorbing the deformation of the shell 10 through reversible deformation, and the buffer zone 1012 will not be able to play an effective role. If the hardness is too low, the deformation of the shell 10 may be too large, thereby causing tension on the fixing area 1011 and affecting the connection effect between the fixing area 1011 and the mounting plate. Therefore, the hardness H of the shell 10 should be moderate. For example, H can be any one of 20HV, 30HV, 40HV, 50HV, 60HV, 70HV, 80HV, 90HV, 100HV, 110HV, 120HV, 130HV, 140HV, 150HV, 160HV, 170HV, 180HV, 190HV, 200HV, 210HV, 220HV, 230HV, 240HV, 250HV, 260HV, 270HV, and 280HV, or fall within the range of any two of these values.
[0044] In some embodiments, the mounting plate is a liquid cooling plate that can exchange heat with the solid-state battery.
[0045] In this embodiment, the mounting plate is a liquid cooling plate to cool the solid-state battery and alleviate the overheating and expansion of the solid-state battery.
[0046] Specifically, based on the high heat resistance of solid-state batteries, which do not require a cooling plate and have high cooling power, the thermal interface between the casing 10 and the liquid cooling plate can be appropriately reduced, and the flow channels of the liquid cooling plate can also be appropriately reduced, thereby reducing weight and cost.
[0047] More specifically, considering the dynamic change in thickness of the buffer zone 1012 according to the battery cycle process, the thermally conductive adhesive between the housing 10 and the mounting plate can be a thermally conductive gel, which can undergo elastic deformation to accommodate the thickness changes of the housing 10.
[0048] In addition, the liquid cooling plate can be placed only in the area corresponding to the terminal of the solid-state battery, thereby cooling the main heat-generating area of the solid-state battery. Moreover, the positions of the current collector, terminal, and busbar are fixed and do not shift during the charge and discharge cycle of the solid-state battery.
[0049] Secondly, embodiments of this application propose a battery pack that includes the battery module of the first aspect. Therefore, the battery pack of the second aspect possesses all the technical effects of the battery module of the first aspect, and its specific effects will not be elaborated further.
[0050] It should be noted that the battery pack in this embodiment only presents the structure related to the improvement points. Of course, it may also include other components. For example, the battery pack includes a battery frame, a battery protection board, etc. Other components will not be described here.
[0051] In particular, the term "and / or" in this application should be understood as follows:
[0052] In the first case, the term “and / or” between the first subject and the second subject includes any of the following meanings: (1) only the first subject; (2) only the second subject; and (3) both the first subject and the second subject.
[0053] In the second case, the term "and / or" between the last two of three or more subjects means including at least any one of the subjects. For example, "first subject, second subject and / or third subject" has the same meaning as "first subject and / or second subject and / or third subject", specifically including the following combinations: (1) only the first subject; (2) only the second subject; (3) only the third subject; (4) first subject and second subject and no third subject; (5) first subject and third subject and no second subject; (6) second subject and third subject and no first subject; and (7) first subject, second subject and third subject;
[0054] Furthermore, the character " / " in this application indicates that the objects before and after it are in an "or" relationship.
[0055] Finally, although the embodiments of this application have been described above in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the concept of this application, and such modifications and variations all fall within the scope of protection of this application.
Claims
1. A battery module, characterized by, include: Mounting plate; A solid-state battery includes a housing (10) and a cell disposed inside the housing (10). The housing (10) has a first surface (101), which has a fixing area (1011) and a buffer area (1012). The fixing area (1011) is connected to the mounting plate, and the buffer area (1012) can absorb the deformation of the housing (10).
2. The battery module of claim 1, wherein, The fixed area (1011) and the buffer area (1012) are arranged side by side along the first direction (X), and along the first direction (X), the size of the fixed area (1011) is L1, the size of the buffer area (1012) is L2, and the condition 0.75≤L1 / L2≤18 is satisfied.
3. The battery module of claim 2, wherein, Along the first direction (X), the size L1 of the fixed area (1011) satisfies 7.5mm≤L1≤45mm; and / or, along the first direction (X), the size L2 of the buffer zone (1012) satisfies 2.5mm≤L2≤10mm.
4. The battery module of claim 2, wherein, The buffer zone (1012) includes two sub-buffer zones (1012), which are symmetrically arranged on both sides of the fixed area (1011) along the first direction (X).
5. The battery module according to claim 1, characterized in that, The fixing area (1011) has a planar structure, which is bonded or welded to the mounting plate.
6. The battery module of claim 1, wherein, The buffer zone (1012) includes alternating protrusions and grooves, which constitute a deformable portion.
7. The battery module of claim 6, wherein, The deformation amount of the deformable part is δ, and satisfies 0.35mm≤δ≤4.5mm.
8. The battery module of any one of claims 1 to 7, wherein, The shell (10) also has a second surface (102) which is adjacent to the first surface (101) and the area of the second surface (102) is greater than the area of the first surface (101); The deformation rate of the first surface (101) is d1, and the deformation rate of the second surface (102) is d2, and the condition 0.01≤d1-d2≤0.45 is satisfied.
9. The battery module of any one of claims 1 to 7, wherein, The hardness of the shell (10) is H, and it satisfies 20HV≤H≤280HV.
10. The battery module of any one of claims 1 to 7, wherein, The mounting plate is a liquid cooling plate, which can exchange heat with the solid-state battery.
11. A battery pack, characterized by Includes the battery module as described in any one of claims 1 to 10.