Solid-state battery module, battery pack and energy storage device

Abstract

The utility model provides a solid-state battery module, a battery pack and an energy storage device. The solid-state battery module comprises two end plates which are oppositely arranged, a battery lamination group which is clamped between the two end plates, and a plurality of connecting pieces, fixing plates are arranged on one side of at least one end plate at intervals; each connecting piece penetrates through the two end plates and the battery lamination group and is detachably connected to the fixed plate, at least one connecting piece is provided with an elastic piece, and the two ends of the elastic piece abut against the fixed plate and the end plate adjacent to the fixed plate respectively. According to the solid-state battery assembly disclosed by the utility model, the battery lamination pack is compressed by utilizing the elastic force of the plurality of connecting pieces and the elastic pieces, so that not only can full contact of battery interfaces be ensured, but also a certain space can be provided for bulging deformation of the battery lamination pack in the use process through compression of the elastic pieces, and thus the performance of a solid-state battery can be improved.

Description

Technical Field

[0001] The utility model relates to the field of battery technology, and in particular to a solid-state battery module. The utility model also relates to a battery pack and an energy storage device provided with the solid-state battery module. Background Art

[0002] Solid-state batteries require sufficient clamping force to maintain full contact between interfaces because their electrolytes are in solid form. However, in the prior art, when the solid-state battery structure is clamped and fixed by the end plates on both sides, there is insufficient clamping force in the middle of the battery stack, which affects the full contact between the battery interfaces and thus affects the performance of the solid-state battery. Utility Model Content

[0003] In view of this, the utility model aims to provide a solid-state battery module to ensure sufficient contact between the battery interfaces, thereby facilitating the improvement of solid-state battery performance.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] A solid-state battery module comprises two end plates arranged opposite to each other, a battery stack sandwiched between the two end plates, and a plurality of connectors;

[0006] A fixing plate is provided at intervals on one side of at least one of the end plates;

[0007] Each of the connecting members passes through the two end plates and the battery stack, and is detachably connected to the fixed plate, and at least one of the connecting members is provided with an elastic member, the two ends of which are respectively pressed against the fixed plate and the end plate adjacent to the fixed plate.

[0008] Furthermore, each of the connecting members is screwed to the fixing plate.

[0009] Furthermore, the fixing plate is provided with connecting holes corresponding to each of the connecting members; each of the connecting members is inserted into each of the connecting holes in a one-to-one correspondence, and a nut is threadedly connected to the end of each of the connecting members.

[0010] Furthermore, the plurality of connection holes are arranged at intervals along the length direction of the fixing plate, and / or the plurality of connection holes are arranged at intervals along the width direction of the fixing plate.

[0011] Furthermore, a cavity is provided in the connector, and the cavity is arranged to pass through the connector in an axial direction; a heat exchange pipeline connected to an external heat exchange device is provided in the cavity, and the heat exchange pipeline is used to exchange heat inside the battery stack.

[0012] Furthermore, a cavity is provided in the connecting member, and the cavity is arranged to penetrate the connecting member in the axial direction; a heating element for heating the interior of the battery stack is provided in the cavity.

[0013] Furthermore, the heating element is a heating wire.

[0014] Furthermore, the battery stack group includes a positive electrode layer, a solid electrolyte layer and a negative electrode layer, and the vias on the battery stack group penetrate the positive electrode layer, the solid electrolyte layer and the negative electrode layer; the positive electrode layer includes a positive electrode collector and a positive electrode active material layer, and the negative electrode layer includes a negative electrode collector and a negative electrode active material layer.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] The solid-state battery module described in the utility model has multiple connecting pieces that penetrate the end plate and the battery stack group, and elastic pieces arranged on the connecting pieces, thereby utilizing the elastic force of the multiple connecting pieces and the elastic pieces to compress the battery stack group, thereby ensuring sufficient contact of the battery interface, and the compression of the elastic pieces can also provide a certain space for the swelling and deformation of the battery stack group during use, thereby improving the performance of the solid-state battery and having a good use effect.

[0017] In addition, the connector and the fixing plate are connected by screw connection, which can ensure the reliability of the connection and facilitate the installation and removal of the battery stack. The connector is set to pass through the connection hole on the fixing plate and is fixed by the nut at the end. In this way, the pressure applied to the battery stack can be adjusted by changing the position where the nut is screwed into the connector.

[0018] In addition, the arrangement of multiple connection holes can effectively solve the problem of insufficient constraint in the middle of the battery stack, which is beneficial to provide greater constraint force on the battery stack, and can further ensure full contact of the battery interface, thereby further improving the performance of solid-state batteries. A cavity is provided in the connector, and a heat exchange pipeline connected to an external heat exchange device is provided in the cavity, which is beneficial to heating or cooling the interior of the battery stack. In addition, the heating element provided in the cavity can heat the interior of the battery stack and improve the heating efficiency.

[0019] Another object of the present invention is to provide a battery pack, in which the solid-state battery module as described above is provided.

[0020] Another object of the present invention is to provide an energy storage device, in which the solid-state battery module as described above is provided.

[0021] The battery pack and energy storage device of the present invention have the same beneficial effects as the solid-state battery module described above relative to the prior art, and will not be described in detail herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0023] Figure 1 This is a structural schematic diagram of a solid-state battery module according to an embodiment of the utility model from a first viewing angle;

[0024] Figure 2 A structural schematic diagram of a solid-state battery module according to an embodiment of the present utility model from a second viewing angle;

[0025] Figure 3 for Figure 2 Section view from the middle AA direction;

[0026] Figure 4 It is a structural schematic diagram of a battery stack according to an embodiment of the utility model;

[0027] Figure 5 This is a structural schematic diagram of the end plate and the connecting piece in the matching state according to the embodiment of the utility model;

[0028] Figure 6 A schematic diagram of a partial structure of a battery pack according to an embodiment of the utility model;

[0029] Description of reference numerals:

[0030] 2. Battery stack; 20. Via hole; 3. Connector; 30. Cavity; 4. Elastic member; 5. Nut; 6. Fixing plate; 10. Mounting hole; 11. First end plate; 12. Second end plate; 100. Battery pack shell. DETAILED DESCRIPTION

[0031] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0032] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0033] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0034] Embodiment 1

[0035] The present embodiment relates to a solid-state battery module to ensure sufficient contact between battery interfaces, thereby facilitating improved solid-state battery performance.

[0036] In terms of overall composition, Figures 1 to 3 As shown, the solid-state battery module of this embodiment includes two end plates arranged opposite to each other, a battery stack 2 sandwiched between the two end plates, and a plurality of connectors 3. Among them, a fixing plate 6 is provided at intervals on one side of at least one of the end plates. In addition, each connector 3 passes through the two end plates and the battery stack 2, and is detachably connected to the fixing plate 6, and at least one of the connectors 3 is provided with an elastic member 4, and the two ends of the elastic member 4 are respectively pressed against the fixing plate 6 and the end plate adjacent to the fixing plate 6.

[0037] At this time, through the multiple connecting parts 3 that penetrate the end plate and the battery stack group 2, and the elastic parts 4 arranged on the connecting parts 3, the elastic force of the multiple connecting parts 3 and the elastic parts 4 can be used to compress the battery stack group 2, so as to ensure sufficient contact of the battery interface. In addition, the compression of the elastic parts 4 can also provide a certain space for the expansion and deformation of the battery stack group 2 during use, thereby improving the performance of the solid-state battery.

[0038] Based on the above overall introduction, in detail, as a preferred implementation, in this embodiment, combined with Figures 1 to 3 As shown, the battery stack 2 is sandwiched between two end plates, that is, sandwiched between the first end plate 11 and the second end plate 12. In this embodiment, a fixing plate 6 is spaced apart on one side of the second end plate 12, and each connecting member 3 passes through the first end plate 11, the battery stack 2 and the second end plate 12, and is detachably connected to the fixing plate 6.

[0039] Moreover, as a preference, an elastic member 4 is sleeved on each connector 3, and the two ends of each elastic member 4 are respectively pressed against the fixing plate 6 and the second end plate 12. In this way, through the cooperation of multiple connectors 3 and multiple elastic members 4, a better pressing force can be provided to the battery stack 2, so that the battery interface of the battery stack 2 is fully contacted.

[0040] It should be noted that, in addition to the fixing plate 6 provided on one side of the second end plate 12, a fixing plate 6 may also be provided on the side of the first end plate 11 away from the battery stack 2. In this case, both ends of the connector 3 are detachably connected to the fixing plates 6 at the corresponding ends.

[0041] As a preferred implementation, in this embodiment, continue to refer to Figures 1 to 3 , and combined with Figure 4 and Figure 5As shown, each connector 3 is screwed to the fixing plate 6. This ensures the reliability of the connection and facilitates the installation and removal of the battery chassis assembly. Specifically, a connection hole is provided on the fixing plate 6 corresponding to each connector 3, and each connector 3 is inserted into each connection hole one by one, and a nut 5 is screwed to the end of each connector 3.

[0042] Of course, it is understandable that the ends of the connectors 3 can also be directly screwed into the connection holes on the fixing plate 6, in which case the connection holes are threaded holes. In addition, it is also understandable that the multiple nuts 5 can also be pre-fixed on the fixing plate 6, for example, by crimping or welding, so that the positions of the multiple connectors 3 can be relatively fixed, and the nuts 5 can also be effectively prevented from loosening under the action of the elastic member 4.

[0043] In addition, it should be noted that the connecting member 3 of this embodiment is, for example, a long bolt with a hollow interior, or a screw with a hollow interior, and when it is a screw, the two ends of the connecting member 3 are screwed together by nuts 5 to fasten the first end plate 11 and the fixing plate 6 together.

[0044] In this embodiment, a plurality of connection holes are arranged at intervals along the length direction of the fixing plate 6, and a plurality of connection holes are also arranged at intervals along the width direction of the fixing plate 6. That is, a plurality of connection members 3 are arranged at intervals along the first direction of the battery stack 2, and a plurality of connection members 3 are arranged at intervals along the second direction of the battery stack 2. The first direction and the second direction are arranged orthogonally, that is, the length direction and the width direction of the battery stack 2. At this time, the arrangement of the connection holes and the connection members 3 can effectively solve the problem of insufficient constraint in the middle of the battery stack 2, which is beneficial to provide a greater constraint force to the battery stack 2, and can further ensure full contact of the battery interface, thereby further improving the performance of the solid-state battery.

[0045] As a preferred embodiment, Figure 2 and Figure 3 As shown, in this embodiment, a cavity 30 is provided in the connector 3, and the cavity 30 is provided through the connector 3 along the axial direction. In addition, a heat exchange pipeline connected to an external heat exchange device is provided in the cavity 30, and the heat exchange pipeline is used to exchange heat inside the battery stack 2. In this way, the heat exchange pipeline can be used to heat or cool the inside of the battery stack 2.

[0046] As a preferred embodiment, a heating element for heating the inside of the battery stack 2 may also be provided in the cavity 30. By providing the heating element, the inside of the battery stack 2 can be heated to improve the heating efficiency. In a specific implementation, the heating element may be, for example, a heating wire.

[0047] It should be noted that the connector 3 of this embodiment may be provided with cavities, or some of the connectors 3 may be provided with cavities. In addition, when multiple cavities are provided, heat exchange pipelines may be provided in each cavity, or heating elements may be provided in each cavity. Of course, heat exchange pipelines may be provided in some cavities, or heating elements may be provided in some cavities, which is feasible.

[0048] In addition, the battery stack 2 of this embodiment includes a positive electrode layer, a solid electrolyte layer and a negative electrode layer, and the via 20 on the battery stack 2 penetrates the positive electrode layer, the solid electrolyte layer and the negative electrode layer. Among them, the positive electrode layer includes a positive electrode current collector and a positive electrode active material layer, and the negative electrode layer includes a negative electrode current collector and a negative electrode active material layer.

[0049] At this time, in a specific implementation, each connector 3 sequentially passes through the mounting hole 10 on the first end plate 11, the through hole 20 on the battery stack 2, the mounting hole 10 on the second end plate 12, the elastic member 4 and the connecting hole on the fixing plate 6, and is threadedly connected with the nut 5. By changing the relative position of the nut 5 and the connector 3, the elastic force applied to the battery stack 2 is adjusted. It is worth noting that the elastic member 4 of this embodiment is preferably a spring.

[0050] The solid-state battery assembly of this embodiment utilizes the elastic force of multiple connecting parts 3 and elastic parts 4 to compress the battery stack group 2, which not only ensures sufficient contact of the battery interface, but also the compression of the elastic parts 4 can provide a certain space for the expansion and deformation of the battery stack group 2 during use, thereby improving the performance of the solid-state battery.

[0051] Embodiment 2

[0052] This embodiment relates to a battery pack, such as Figure 6 As shown, the solid-state battery module described in Embodiment 1 is provided in the battery pack housing 100 of the battery pack.

[0053] The battery pack of this embodiment can ensure sufficient contact of the battery interface by adopting the fixed battery module of the first embodiment, and can also provide a certain space for the expansion and deformation of the battery stack group 2 during use, thereby helping to improve the performance of the battery pack.

[0054] At the same time, this embodiment also relates to an energy storage device, in which the solid-state battery module of Embodiment 1 is provided. It should be noted that the energy storage device is, for example, an energy storage box, and of course, it can also be other equipment, such as a vehicle, to which the solid-state battery module is applied.

[0055] The energy storage device of this embodiment adopts the fixed battery module of the first embodiment, which can also ensure sufficient contact of the battery interface and provide a certain space for the expansion and deformation of the battery stack group 2 during use, thereby improving the performance of the energy storage device.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A solid-state battery module, characterized in that: It comprises two end plates arranged opposite to each other, a battery stack group sandwiched between the two end plates, and a plurality of connecting members; A fixing plate is provided at intervals on one side of at least one of the end plates; Each of the connecting members passes through the two end plates and the battery stack, and is detachably connected to the fixed plate, and at least one of the connecting members is provided with an elastic member, the two ends of which are respectively pressed against the fixed plate and the end plate adjacent to the fixed plate.

2. The solid-state battery module according to claim 1, characterized in that: Each of the connecting members is screwed to the fixing plate.

3. The solid-state battery module according to claim 2, characterized in that: The fixing plate is provided with connecting holes corresponding to the connecting members; The connecting members are inserted into the connecting holes in a one-to-one correspondence, and a nut is threadedly connected to the end of each connecting member.

4. The solid-state battery module according to claim 3, characterized in that: The plurality of connection holes are arranged at intervals along the length direction of the fixing plate, and / or the plurality of connection holes are arranged at intervals along the width direction of the fixing plate.

5. The solid-state battery module according to claim 1, characterized in that: A cavity is provided in the connecting piece, and the cavity is arranged to penetrate the connecting piece along the axial direction; A heat exchange pipeline connected to an external heat exchange device is provided in the cavity, and the heat exchange pipeline is used to exchange heat inside the battery stack.

6. The solid-state battery module according to claim 1, characterized in that: A cavity is provided in the connecting piece, and the cavity is arranged to penetrate the connecting piece along the axial direction; The cavity is provided with a heating element for heating the interior of the battery stack.

7. The solid-state battery module according to claim 6, characterized in that: The heating element adopts a heating wire.

8. The solid-state battery module according to any one of claims 1 to 7, characterized in that: The battery stack comprises a positive electrode layer, a solid electrolyte layer and a negative electrode layer, and the via holes on the battery stack penetrate the positive electrode layer, the solid electrolyte layer and the negative electrode layer; The positive electrode layer includes a positive electrode current collector and a positive electrode active material layer, and the negative electrode layer includes a negative electrode current collector and a negative electrode active material layer.

9. A battery pack, characterized in that: The battery pack is provided with a solid-state battery module according to any one of claims 1 to 8.

10. An energy storage device, characterized in that: The energy storage device is provided with a solid-state battery module according to any one of claims 1-8.

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