Battery modules and battery packs
By using binding straps on the outside of the solid-state battery pack to provide binding force, the problems of weak bonding between the electrode sheets and the solid electrolyte and gas expansion are solved, the active ion transport speed is improved and bulging is prevented, ensuring battery performance and safety.
Patent Information
- Application Number
- CN202521746825.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-15
- Publication Date
- 2026-07-03
- Estimated Expiration
- 2035-08-15
AI Technical Summary
In solid-state batteries, the bonding force between the electrode plates and the solid electrolyte is relatively weak, resulting in a slower transport speed of active ions. At the same time, gas is easily generated and expanded during use, leading to bulging.
A binding strap is used to surround the outside of the solid-state battery pack, providing a binding force that brings the electrodes closer together, improving the bonding between the electrode plates and the solid electrolyte, preventing bulging, and venting internal gases through an exhaust valve.
It improves the speed of active ion transport, ensures battery performance, prevents bulging, ensures uniform stress on the battery, and avoids damage.
Smart Images
Figure CN224458443U_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, in solid-state batteries, the bonding force between the electrode plates and the solid electrolyte is relatively weak, which can easily lead to a slower transport speed of active ions; at the same time, solid-state batteries will generate gas and expand during use, causing bulging. 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] This application proposes a battery module including a solid-state battery pack and a restraining strap; the solid-state battery pack includes a plurality of solid-state batteries arranged side by side along a first direction; the restraining strap surrounds the outside of the solid-state battery pack and has a restraining force that brings the plurality of solid-state batteries closer to each other.
[0006] The technical solution proposed in this application has at least the following technical effects:
[0007] In the above technical solution, multiple solid-state batteries are constrained by binding straps, which tightly binds the electrode plates and solid electrolyte in the solid-state batteries, improves the active ion transport speed, and ensures battery performance. Moreover, the binding straps provide binding force to the solid-state batteries, which can also prevent them from bulging and allow the gas generated inside the solid-state batteries to be discharged from the exhaust valve in a timely manner. In addition, the binding straps are set around the solid-state battery pack to apply an inward force to the entire solid-state battery pack, which has a good binding effect, makes the solid-state batteries uniformly stressed, and avoids the solid-state batteries from being damaged due to uneven stress. Attached Figure Description
[0008] 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.
[0009] Specifically, the annotations for the accompanying drawings are as follows:
[0010] Figure 1 This is a schematic diagram of the structure of the battery module described in some embodiments of this application.
[0011] Specifically, the annotations for the figure marks in the instruction manual are as follows:
[0012] 10. Solid-state battery; 101. Electrode terminal; 20. Restraint strap; 30. End plate; 40. Elastic pad; X, first direction; Y, second direction. Detailed Implementation
[0013] 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.
[0014] 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.
[0015] 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.
[0016] 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.
[0017] 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.
[0018] 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.
[0019] Firstly, referring to Figure 1 The embodiments of this application propose a battery module, which includes a solid-state battery pack and a restraining strap 20; the solid-state battery pack includes a plurality of solid-state batteries 10 arranged side by side along a first direction X; the restraining strap 20 surrounds the outside of the solid-state battery pack and has a restraining force that brings the plurality of solid-state batteries 10 closer to each other.
[0020] In this embodiment, the binding straps 20 provide external force to constrain the multiple solid-state batteries 10, making the electrode plates and solid electrolyte in the solid-state batteries 10 tightly bonded, improving the active ion transport speed and ensuring battery performance. Moreover, the binding force provided by the binding straps 20 to the solid-state batteries 10 can also prevent them from bulging, allowing the gas generated inside the solid-state batteries 10 to be discharged from the exhaust valve in a timely manner. In addition, the binding straps 20 are arranged around the solid-state battery pack to apply an inward force to the entire solid-state battery pack, which has a good binding effect and makes the solid-state batteries 10 uniformly stressed, avoiding damage to the solid-state batteries 10 due to uneven stress.
[0021] In some embodiments, refer to Figure 1 The restraint straps 20 are multiple, and the multiple restraint straps 20 are spaced apart along the second direction Y, which is perpendicular to the first direction X.
[0022] In this embodiment, multiple restraint straps 20 are provided to constrain the solid-state battery pack, which can provide a more comprehensive and uniform restraint force on the solid-state battery 10, further improving the restraint effect.
[0023] In some embodiments, refer to Figure 1 The distance between two adjacent binding straps 20 is d, and it satisfies 5mm≤d≤210mm.
[0024] In this embodiment, the distance d between two adjacent binding straps 20 cannot be too large, otherwise it will reduce the coverage area of the binding straps 20 on the solid-state battery pack and reduce the binding effect. In addition, given that the size of the solid-state battery pack along the second direction Y is constant, if the distance d between two adjacent binding straps 20 is too large, it will also reduce the number of binding straps 20, thereby reducing the binding effect. At the same time, d cannot be too small, otherwise the two adjacent binding straps are prone to friction, generating debris, which may affect battery safety. Therefore, d should be moderate. For example, d can be any one of 5mm, 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, 190mm, 200mm, and 210mm or fall within the range of any two of these values.
[0025] Optionally, the number of restraint straps 20 is 3 to 5.
[0026] In some embodiments, along the second direction Y, the ratio of the total size of the plurality of restraint straps 20 to the size of the solid-state battery pack is greater than or equal to 0.075.
[0027] In this embodiment, the total size of the binding band 20 along the second direction Y cannot be too small, otherwise it will not cover the solid-state battery pack enough, reduce the binding effect, and thus make it difficult to enhance the bonding strength between the electrode sheet and the solid electrolyte in the solid-state battery 10, or prevent the solid-state battery 10 from bulging, etc.
[0028] Optionally, along the second direction Y, the sum of the dimensions of the multiple restraint straps 20 ranges from 24mm to 270mm, for example, it can be 24mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, 190mm, 200mm, 210mm, 220mm, 230mm, 240mm, 250mm, 260mm, and 270mm. Any value or a range between any two of these values; and / or, along the second direction Y, the solid-state battery pack size ranges from 140mm to 320mm, for example, it can be any one of 140mm, 150mm, 160mm, 170mm, 180mm, 190mm, 200mm, 210mm, 220mm, 230mm, 240mm, 250mm, 260mm, 270mm, 280mm, 290mm, 300mm, 310mm and 320mm or a range between any two of these values.
[0029] Optionally, along the second direction Y, the size of a single restraint strap 20 ranges from 12mm to 45mm, for example, it can be any one of 12mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm and 45mm or a range between any two of these values.
[0030] In some embodiments, refer to Figure 1 The solid-state battery 10 extends an electrode terminal 101 along the second direction Y, and the electrode terminal 101 avoids the restraint strap 20.
[0031] In this embodiment, the lead-out direction of the electrode terminal 101 on the solid-state battery 10 avoids the binding strap 20, so as to avoid mutual interference or friction between the two, and the structural design is reasonable.
[0032] In some embodiments, the deformation of the restraint strap 20 along the first direction X is L, and satisfies 0.5mm≤L≤6.5mm.
[0033] In this embodiment, the restraint strap 20 should have a certain stiffness. Its deformation L along the first direction X should not be too large, otherwise it will be difficult to provide effective restraint for the solid-state battery pack. At the same time, L should not be too small, otherwise the restraint strap 20 will be difficult to assemble with the solid-state battery pack, and the restraint strap 20 is prone to breakage or damage to the solid-state battery 10. Therefore, L should be moderate. For example, L can be any one of 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, and 6.5mm, or fall within the range of any two of these values.
[0034] Optionally, the restraint strap 20 can be a metal strap or a composite material that meets the requirements, such as a steel strap or an aluminum strap.
[0035] It should be noted that the deformation here refers to the difference between the size of the solid-state battery pack before and after binding along the first direction X.
[0036] In some embodiments, refer to Figure 1 The battery module also includes two end plates 30, which are respectively located at both ends of the solid-state battery pack along the first direction X, and the binding strap 20 abuts against the end plates 30.
[0037] In this embodiment, end plates 30 are provided at both ends of the solid-state battery pack along the first direction X, so that the restraint strap 20 is directly squeezed against the end plates 30, thereby protecting the solid-state battery pack and preventing damage to the solid-state battery 10.
[0038] Specifically, the end plate 30 can be bonded or welded to the solid-state battery 10.
[0039] In some embodiments, refer to Figure 1 The battery module also includes multiple elastic pads 40, which are disposed between each pair of adjacent solid-state batteries 10.
[0040] In this embodiment, an elastic pad 40 is provided between two adjacent solid-state batteries 10 for buffering, further preventing damage to the solid-state batteries 10; moreover, in daily use, the elastic pad 40 can also absorb the impact of collisions on the solid-state batteries 10.
[0041] Specifically, the elastic pad 40 can be bonded to the solid-state battery 10.
[0042] 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.
[0043] In some embodiments not shown in the figures, the battery module includes end plates 30 disposed at both ends of the solid-state battery pack along a first direction X, and the battery pack includes a frame, with the end plates 30 connected to the frame.
[0044] In this embodiment, the end plate 30 can be connected to the frame to limit the position of the battery module; specifically, the end plate 30 and the frame can be connected by, but not limited to, welding, snap-fitting, bonding or locking with fasteners.
[0045] 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, such as liquid cooling plates, circuit protectors, etc. Other components will not be described here.
[0046] In particular, the term "and / or" in this application should be understood as follows:
[0047] 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.
[0048] 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;
[0049] Furthermore, the character " / " in this application indicates that the objects before and after it are in an "or" relationship.
[0050] 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: A solid-state battery pack includes a plurality of solid-state batteries (10) arranged side by side along a first direction (X); A restraint strap (20) is wrapped around the outside of the solid-state battery pack and has a restraining force that brings the plurality of solid-state batteries (10) closer together.
2. The battery module of claim 1, wherein, The restraint straps (20) are multiple, and the multiple restraint straps (20) are spaced apart along a second direction (Y), which is perpendicular to the first direction (X).
3. The battery module of claim 2, wherein, The distance between two adjacent binding straps (20) is d, and satisfies 5mm≤d≤210mm.
4. The battery module of claim 2, wherein, Along the second direction (Y), the ratio of the total size of the plurality of binding straps (20) to the size of the solid-state battery pack is greater than or equal to 0.
075.
5. The battery module of claim 2, wherein, Along the second direction (Y), the sum of the dimensions of the plurality of binding straps ranges from 24 mm to 270 mm; and / or, along the second direction (Y), the dimensions of the solid-state battery pack range from 140 mm to 320 mm.
6. The battery module of claim 4, wherein, Along the second direction (Y), the size of a single strap ranges from 12mm to 45mm.
7. The battery module of claim 2, wherein, The solid-state battery (10) has an electrode terminal (101) extending out along the second direction (Y), and the electrode terminal (101) avoids the restraint strap (20).
8. The battery module according to claim 1, characterized in that, The deformation of the restraint band (20) along the first direction (X) is L, and satisfies 0.5mm≤L≤6.5mm.
9. The battery module of any one of claims 1 to 8, wherein, The battery module also includes two end plates (30), which are respectively disposed at both ends of the solid-state battery pack along the first direction (X), and the binding strap (20) abuts against the end plates (30).
10. The battery module of any one of claims 1 to 8, wherein, The battery module also includes multiple elastic pads (40), which are respectively disposed between each two adjacent solid-state batteries (10).
11. A battery pack, characterized by Includes the battery module as described in any one of claims 1 to 10.
12. The battery pack of claim 11, wherein, The battery module includes end plates (30) disposed at both ends of the solid-state battery pack along the first direction (X), the battery pack includes a frame, and the end plates (30) are connected to the frame.