Solid-state battery module and battery pack

Abstract

PURPOSE: To provide a solid battery module and a battery pack that relate to battery technologies.SOLUTION: A solid battery module includes a housing, and a cell stacked disposed in the housing. The housing includes a top plate, a bottom plate, and two side plates. The two side plates face each other. At least one of the side plates can move relative to the top plate and the bottom plate in a first direction. In a battery pack according to the present invention, each side plate of the solid battery module and a box main body are connected to each other with a connection piece. The connection piece is capable of plastic deformation in a stacking direction of the cell stack.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to battery technology, and in particular to solid-state battery modules and battery packs. [Background technology]

[0002] A battery module includes a housing and a cell stack disposed within the housing, with the housing's side, top, and bottom plates typically being fixedly connected to support and protect the cell stack. Summary of the Invention [Problem to be solved by the invention]

[0003] In solid-state battery modules, the cells may expand significantly, and the use of the above-mentioned housing may cause problems such as deformation of the housing and damage to the cells, which may affect the performance of the battery and create potential safety issues. [Means for solving the problem]

[0004] To achieve the above objectives, the following technical solutions are provided:

[0005] The present invention provides a solid-state battery module that includes a housing and a cell stack disposed within the housing.

[0006] The housing includes the following:

[0007] A top plate and a bottom plate facing each other;

[0008] Two side panels connected between the top and bottom panels and facing each other.

[0009] At least one of the side plates is movable relative to the top and bottom plates in a first direction, the first direction being a stacking direction of the cell stack.

[0010] In an optional solution of the solid-state battery module, the top plate includes a first slide rail extending in a first direction, and at least one of the side plates is slidably connected to the first slide rail.

[0011] The bottom plate includes a second slide rail extending in the first direction, and at least one of the side plates is slidably connected to the second slide rail.

[0012] In an optional solution of the solid-state battery module, the top plate includes a plurality of first deformation portions, the first deformation portions are disposed between the two side plates, and the first deformation portions can generate plastic deformation in a first direction.

[0013] The bottom plate includes a plurality of second deformation portions, the second deformation portions being disposed between the two side plates, and the second deformation portions being capable of generating plastic deformation in a first direction.

[0014] In an optional solution of the solid-state battery module, the first deformation portion is a first protrusion or a first recess disposed on the top plate.

[0015] The second deformation portion is a second convex portion or a second concave portion disposed on the bottom plate.

[0016] In an optional solution of the solid-state battery module, the first protrusion or the first recess is disposed in the length direction of the top plate.

[0017] The second protrusion or second recess is disposed in the length direction of the bottom plate.

[0018] In an optional solution of the solid-state battery module, the length of the first protrusion or the length of the first recess is equal to the length of the top plate.

[0019] The length of the second protrusion or the length of the second recess is equal to the length of the bottom plate.

[0020] In an optional solution of the solid-state battery module, the first protrusion or the first recess has a through slot, and the number of the through slots is N, where N is a natural number greater than or equal to 1.

[0021] The second protrusion or the second recess has a through hole, and the number of the through holes is N, where N is a natural number greater than or equal to 1.

[0022] As an optional solution of the solid-state battery module, each through-hole is provided with a first adjustable connecting piece capable of generating plastic deformation, and both ends of the first adjustable connecting piece are fixedly connected to the top plate or the bottom plate in a first direction.

[0023] In an optional solution of the solid-state battery module, the side plate includes a connection portion, and the connection portion is configured to be connected to a battery pack.

[0024] The present invention further provides a battery pack including:

[0025] The box body,

[0026] The above solid-state battery module disposed in a box body; and

[0027] A connection piece connected between one side plate of the solid-state battery module and the box body, the connection piece being capable of causing plastic deformation in a first direction.

[0028] As an alternative to the solid-state battery module, the connecting pieces are made of low carbon steel, aluminum alloy, or plastic steel.

[0029] As an optional solution of the solid-state battery module, the connecting piece includes:

[0030] a first portion connected to one side panel of the housing;

[0031] a second section disposed on a side of the first section away from the side panel and fixedly connected to the box body;

[0032] A third part fixedly connected between the first and second parts.

[0033] In an alternative embodiment of the solid-state battery module, the third portion is disposed at an angle.

[0034] As an optional solution of the solid-state battery module, the third part includes a plurality of connecting split parts, and two ends of each connecting split part are fixedly connected to the first part and the second part.

[0035] A gap is provided between two adjacent connecting segments.

[0036] As an optional solution of the solid-state battery module, the battery pack further includes a second adjusting connecting piece capable of generating plastic deformation, the second adjusting connecting piece being fixedly connected to the first part and the second part and disposed within the gap.

[0037] In an optional solution of the solid-state battery module, the first portion and the side plate are fixedly connected by a threaded fastener.

[0038] The second part and the box body are fixedly connected by a threaded fastener.

[0039] In an alternative embodiment of the solid-state battery module, the first portion is welded and fixed to the side plate.

[0040] The second part is welded and fixed to the box body. Effect of the Invention

[0041] Compared with the related art, the beneficial effects of the present invention include:

[0042] The solid-state battery module provided by the present invention disposes a cell stack in a housing, and when the cells expand, the side plates of the housing can move relative to the top and bottom plates in the stacking direction of the cell stack, thereby preventing problems such as deformation of the housing and damage to the cells caused by the internal cells applying excessive pressure to the side plates, thereby improving the performance and safety of the battery.

[0043] The battery pack provided by the present invention connects each side plate of the solid-state battery module to the box body with a connecting piece. Moreover, the connecting piece can generate plastic deformation in the stacking direction of the cell stack. When the cells expand, the connecting piece can absorb the deformation of the module in the expansion direction of the cells without damaging the structure of the module. This makes it less likely that the connecting piece will break, and improves the connection stability between the battery module and the battery box. [Brief description of the drawings]

[0044] The accompanying drawings are included to provide a further understanding of the principles of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0045] [Figure 1] FIG. 2 is a schematic diagram of the connection relationship between a battery module and a battery box body according to an embodiment of the present invention. [Diagram 2] FIG. 2 is an enlarged view of FIG. [Diagram 3] 4 is an enlarged view of a top plate and a first adjustment connecting piece according to one embodiment of the present invention. FIG. [Figure 4] FIG. 2 is an enlarged view of a connecting piece and a second adjusting connecting piece according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0046] In order to make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, more complete and detailed description of the embodiments of the present invention will be given below with reference to the accompanying drawings as examples. Of course, the following embodiments are only a part, but not all, of the embodiments of the present invention. The components in the embodiments of the present invention described and illustrated in the drawings of this specification may be arranged and designed in various shapes.

[0047] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention, but merely illustrates selected embodiments of the present invention. All other embodiments obtained based on the embodiments of the present invention without the need for creative labor by those skilled in the art are all within the protection scope of the present invention.

[0048] It should be noted that like numerals and letters represent like items in the following drawings, so that once an item is defined in one drawing, it does not need to be further defined and explained in a subsequent drawing.

[0049] It should be noted that in the description of the present invention, terms such as "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like refer to orientations or positions based on the orientations or positions shown in the drawings or the orientations or positions in which the product of the present invention is normally placed when in use. The above terms are used for convenience or ease of describing the present invention, and do not indicate or imply that the specified devices or elements are in a particular orientation, constructed or operated in a particular orientation, and should not be understood as limitations on the present invention. Furthermore, terms such as "first", "second", "third", and the like are used merely to separate the description, and do not indicate or imply relative importance. In the description of the present invention, unless otherwise specified, "plurality" refers to two or more than two.

[0050] It should be noted that, unless otherwise clearly specified and defined in the description of the present invention, the terms "disposed" and "connected" should be understood to have a broad meaning. For example, they may be fixedly connected, detachably connected, integrally connected, mechanically connected, or electrically connected. Those skilled in the art can define the specific meanings of the above terms in the present invention according to the specific circumstances.

[0051] In the present invention, unless otherwise clearly specified and defined, the arrangement of a first feature "above" or "below" a second feature may include direct contact between the first feature and the second feature, or may include contact between them through another feature rather than direct contact. Furthermore, the arrangement of a first feature "above," "above," and "on top" of a second feature may include the arrangement of the first feature directly above and diagonally above the second feature, or may simply mean that the first feature is simply at a higher level than the second feature. The arrangement of a first feature "below," "below," and "below" a second feature may include the arrangement of the first feature directly below and diagonally below the second feature, or may simply mean that the first feature is simply at a lower level than the second feature.

[0052] Hereinafter, the embodiments of the present invention will be described in detail. Examples of the embodiments are shown in the drawings, and the same or similar reference numerals throughout the specification refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are intended to merely illustrate the present invention and should not be construed as limiting the present invention.

[0053] As shown in FIGS. 1 to 4, the present embodiment provides a solid-state battery module 1 including a housing 11 and a cell stack 12 arranged in the housing 11. The cell stack 12 is an entirety formed by sequentially arranging and stacking a plurality of cells 121, specifically, a collection of cells in which the large surfaces of the cells 121 are stacked adjacent to each other. The large surfaces of the cells 121 are the surfaces of the cells 121 that have the largest surfaces. The housing 11 includes a top plate 111, a bottom plate 112, and two side plates 113, where the top plate 111 and the bottom plate 112 face each other. The two side plates 113 are connected between the top plate 111 and the bottom plate 112, where the two side plates 113 face each other. At least one of the side plates 113 can move relative to the top plate 111 and the bottom plate 112 in a first direction, where the first direction is a stacking direction of the cell stack 12.

[0054] The cell stack 12 is disposed in the housing 11, and when the cells expand, the side plates 113 of the housing 11 can move relative to the top plate 111 and bottom plate 112 in the stacking direction of the cell stack 12. This prevents problems such as deformation of the housing 11 and damage to the cells caused by the internal cells 121 applying excessive pressure to the side plates 113, thereby improving the performance and safety of the battery.

[0055] It should be noted that the top plate 111 and the bottom plate 112 have the same shape and size. In this embodiment, as shown in Fig. 1, both the top plate 111 and the bottom plate 112 are rectangular, and the width direction K of the top plate 111 and the bottom plate 112 is the stacking direction of the cell stack 12. In other words, the width direction of the top plate 111 and the bottom plate 112 is the above-mentioned first direction, and the length direction of the top plate 111 and the bottom plate 112 is perpendicular to the first direction.

[0056] In one embodiment, the top plate 111 includes a plurality of first deformation parts. The first deformation parts are disposed between the two side plates 113, and the first deformation parts can cause plastic deformation in the first direction, so that the width dimension of the top plate 111 can be increased. That is, when the cell expands, the two side plates 113 can be moved relative to the top plate 111 in the stacking direction of the cell stack 12. Therefore, problems such as deformation of the housing 11 and damage to the cells can be prevented. The bottom plate 112 includes a plurality of second deformation parts. The second deformation parts are disposed between the two side plates 113, and the second deformation parts can cause plastic deformation in the first direction, so that the width dimension of the bottom plate 112 can be increased. That is, when the cell expands, the two side plates 113 can be moved relative to the bottom plate 112 in the stacking direction of the cell stack 12. Therefore, problems such as deformation of the housing 11 and damage to the cells can be prevented.

[0057] In one embodiment, the first deformation portion is a first convex portion 1111 or a first concave portion disposed on the top plate 111, and the second deformation portion is a second convex portion 1121 or a second concave portion disposed on the bottom plate 112. It should be noted that by providing a convex portion or a concave portion, when the cell expands, the convex portion or the concave portion will be subjected to the pulling force of the side plate 113 and will tend to gradually become flush with the top plate 111 or the bottom plate 112, and the convex portion or the concave portion may disappear. This increases the distance between the two side plates 113 to compensate for the expansion of the cell.

[0058] In this embodiment, the first deformation portion is a first convex portion 1111 provided on the top plate 111. Furthermore, since the first convex portion 1111 protrudes in a direction away from the bottom plate 112, the side surface of the top plate 111 facing the cells becomes flat and does not interfere with the cells. The second deformation portion is a second convex portion 1121 provided on the bottom plate 112. Furthermore, since the second convex portion 1121 protrudes in a direction away from the top plate 111, the side surface of the bottom plate 112 facing the cells becomes flat and does not interfere with the cells.

[0059] In one embodiment, the first convex portion 1111 or the first recess extends in the length direction of the top plate 111, and the second convex portion 1121 or the second recess extends in the length direction of the bottom plate 112. This allows the first convex portion 1111 or the first recess and the second convex portion 1121 or the second recess to easily undergo plastic deformation under the action of the expansion force of the cells.

[0060] In one embodiment, the length of the first protrusion 1111 or the length of the first recess is equal to the length of the top plate 111, and the length of the second protrusion 1121 or the length of the second recess is equal to the length of the bottom plate 112. By doing so, the width of the top plate 111 and the width of the bottom plate 112 can be increased overall, and the top plate 111 and the bottom plate 112 can be fitted to the expanded cell, without affecting the performance of the cell.

[0061] In one embodiment, the first protrusion 1111 or the first recess has a through hole, and / or the second protrusion 1121 or the second recess has a through hole, and the number of the through holes is N, where N is a natural number greater than or equal to 1. By arranging the through holes, the deformation amount and speed of the first protrusion 1111 or the first recess and the second protrusion 1121 or the second recess can be adjusted to better match the expansion amount and speed of the cell.

[0062] In this embodiment, the first protrusion 1111 and the second protrusion 1121 each have a through hole. For convenience of explanation, the through hole provided in the first protrusion 1111 is indicated as a first through hole 1112, and the through hole provided in the second protrusion 1121 is indicated as a second through hole 1122. Specifically, two first protrusions 1111 are provided, and the two first protrusions 1111 are provided at both ends of the top plate 111 in the width direction. Since each first protrusion 1111 has a plurality of first through holes 1112, when the cell expands, the side plate 113 can rapidly plastically deform the first protrusion 1111. Two second protrusions 1121 are provided, and the two second protrusions 1121 are provided at both ends of the bottom plate 112 in the width direction. Since each second protrusion 1121 has a plurality of second through holes 1122, the side plate 113 can rapidly plastically deform the second protrusion 1121 when the cell expands.

[0063] In one embodiment, as shown in Fig. 3 in conjunction with Figs. 1 and 2, a first adjustable connecting piece 114 capable of plastic deformation is provided in one through hole, and both ends of the first adjustable connecting piece 114 are provided in the top plate 111 or the bottom plate 112 in the first direction. By arranging the first adjustable connecting piece, the strength of the first convex portion 1111 or the first concave portion and the second convex portion 1121 or the second concave portion can be improved, and therefore the deformation amount and speed of the first convex portion 1111 or the first concave portion and the second convex portion 1121 or the second concave portion can be adjusted.

[0064] In another embodiment, the top plate 111 includes a first slide rail extending in a first direction, and at least one of the side plates 113 is slidably connected to the first slide rail. The bottom plate 112 includes a second slide rail extending in the first direction, and at least one of the side plates 113 is slidably connected to the second slide rail. This arrangement can also achieve the purpose of moving the side plate 113 relative to the top plate 111 and the bottom plate 112 in the stacking direction of the cell stack 12.

[0065] In one embodiment, each side panel 113 includes a connection portion 1131. The connection portion 1131 is configured to be connected to a battery pack, which can prevent the side panels 113 from being deformed or damaged, as compared to a case in which the side panels are directly connected to the battery pack.

[0066] This embodiment further provides a battery pack. As shown in Figures 1 and 2, the battery pack includes a box body 2, a connection piece 3, and a solid-state battery module 1 as described above, and the battery module is disposed in the box body 2. The connection piece 3 is connected between one side plate 113 of the solid-state battery module 1 and the box body 2, and the connection piece 3 can generate plastic deformation in a first direction.

[0067] One side plate 113 of the solid-state battery module 1 and the box body 2 are connected by a connection piece 3, and the connection piece 3 can cause plastic deformation in the stacking direction of the cell stack 12. When the cell expands, the connection piece 3 can absorb the deformation of the solid-state battery module 1 in the expansion direction of the cell 121 without damaging the structure of the module. This makes it less likely that the connection piece 3 will break, and improves the connection stability between the battery module and the battery box 2.

[0068] In one embodiment, the connection piece 3 is made of low carbon steel, aluminum alloy, or plastic steel. Of course, the connection piece 3 may be made of other steel materials with higher plasticity, or other metal or non-metal materials with better plasticity may be used, so there is no limitation here.

[0069] In this embodiment, the connection piece 3 is made of low carbon steel, which not only meets the requirements of plastic deformation, but also has the necessary strength, so that the stability of the connection between the housing 11 and the box body 2 is guaranteed.

[0070] In one embodiment, the connection piece 3 includes a first portion 31, a second portion 32, and a third portion 33. The first portion 31 is connected to one side plate 113 of the housing 11. The second portion 32 is installed on a side of the first portion 31 away from the side plate 113, and is fixedly connected to the box body 2. The third portion 33 is fixedly connected between the first portion 31 and the second portion 32. In this manner, the first portion 31 and the second portion 32 move relative to each other, causing the connection piece 3 to undergo plastic deformation.

[0071] In one embodiment, the third portion 33 is disposed at an angle, so that the third portion 33 can support the first portion 31 and the second portion 32 to a certain extent and can also facilitate the relative movement between the first portion 31 and the second portion 32. In this way, the connecting piece 3 undergoes plastic deformation.

[0072] In one embodiment, the third portion 33 includes a plurality of connecting segments 331, and two ends of each connecting segment 331 are fixedly connected to the first portion 31 and the second portion 32. A gap 332 is provided between two adjacent connecting segments 331. With this arrangement, the deformation amount and speed of the connecting piece 3 can be adjusted to match the expansion amount and speed of the cell.

[0073] In one embodiment, as shown in Fig. 4 in conjunction with Fig. 1 and Fig. 2, the battery pack further includes a second adjusting connection piece 4 capable of generating plastic deformation, and the second adjusting connection piece 4 is fixedly connected to the first part 31 and the second part 32 and disposed in the gap 332. By disposing the second adjusting connection piece, the strength of the third part 33 is improved, so that the deformation amount and speed of the connection piece 3 can be adjusted.

[0074] In one embodiment, the first part 31 and the side plate 113 are fixedly connected by a screw fastener, which makes it convenient to disassemble and assemble and perform subsequent maintenance. The second part 32 and the box body 2 are fixedly connected by a screw fastener, which makes it convenient to disassemble and assemble and perform subsequent maintenance.

[0075] In this embodiment, the first part 31 and the connection part 1131 are fixedly connected by a bolt, and the second part and the horizontal beam or vertical beam 21 of the box body 2 are fixedly connected by a bolt, which makes disassembly and assembly convenient and provides excellent connection stability.

[0076] In another embodiment, the first portion 31 and the side panel 113 may be arranged to be welded and fixed to improve connection stability, and the second portion may be welded and fixed to the box body 2 to improve connection stability.

[0077] It should be noted that the above is merely a description of the preferred embodiments of the present invention and the technical principles used. Those skilled in the art can understand that the present invention is not limited to the specific embodiments described above, and various obvious modifications, rearrangements, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail by the above embodiments, other equivalent embodiments can also be included without departing from the concept of the present invention. The scope of the present invention is to be determined based on the scope of the appended claims. [Industrial Applicability]

[0078] Provided is a solid-state battery module and a battery pack capable of solving the problems of deformation and damage to cells caused by cell expansion. [Explanation of symbols]

[0079] 1 Solid-state battery module 11. Cabinet 111 Tabletop 1111 First protrusion 1112 Through hole 112 Bottom plate 1121 Second protrusion 1122 Through hole 113 Side Panel 1131 Connection 114 First adjustment connector 12 Cell Stack 121 Cell 2 Box body 21 Vertical Beam 3 Connection piece 31 Part 1 32 Part 2 33 Part 3 331 Connection division 332 Gap 4 Second adjustment connector

Claims

1. A solid-state battery module including a housing and a cell stack disposed within the housing, The housing, A top plate and a bottom plate facing each other; Two side panels connected between the top panel and the bottom panel and facing each other; at least one of the side plates is movable relative to the top plate and the bottom plate in a first direction, the first direction being a stacking direction of the cell stack; The top plate includes a plurality of first deformation portions, the first deformation portions are disposed between the two side plates, and the first deformation portions are capable of causing plastic deformation in the first direction; The bottom plate includes a plurality of second deformation portions, the second deformation portions are disposed between the two side plates, and the second deformation portions are capable of generating plastic deformation in the first direction; A solid-state battery module, wherein the first deformation portion and / or the second deformation portion have a through hole along the longitudinal direction of the top plate and / or the longitudinal direction of the bottom plate.

2. The top panel includes a first slide rail extending in the first direction, and at least one of the side panels is slidably connected to the first slide rail; The solid-state battery module according to claim 1 , wherein the bottom plate includes a second slide rail extending in the first direction, and at least one of the side plates is slidably connected to the second slide rail.

3. the first deformation portion is a first convex portion or a first concave portion disposed on the top plate, The solid-state battery module according to claim 1 , wherein the second deformation portion is a second convex portion or a second concave portion disposed on the bottom plate.

4. The first protrusion or the first recess is disposed in the longitudinal direction of the top plate, The solid-state battery module according to claim 3 , wherein the second protrusion or the second recess is disposed in the length direction of the bottom plate.

5. a length of the first protrusion or a length of the first recess is equal to a length of the top plate, The solid-state battery module according to claim 4 , wherein a length of the second protrusion or a length of the second recess is equal to a length of the bottom plate.

6. The number of the through holes provided in the top plate is N, and N is a natural number greater than or equal to 1, and / or The solid-state battery module according to claim 4 , wherein the number of the through holes provided in the bottom plate is N, where N is a natural number greater than or equal to 1.

7. 7. The solid-state battery module according to claim 6, wherein each of the through holes is provided with a first adjustment connection piece capable of generating plastic deformation, and both ends of the first adjustment connection piece are fixedly connected to the top plate or the bottom plate in the first direction.

8. The solid-state battery module according to claim 1 , wherein the side plates include connection portions, the connection portions configured to be connected to a battery pack.

9. The box body, The solid-state battery module according to any one of claims 1 to 8, which is disposed in the box body; and a connection piece connected between one side plate of the solid-state battery module and the box body, the connection piece being capable of causing plastic deformation in the first direction; Including battery pack.

10. 10. The battery pack according to claim 9, wherein the connecting piece is made of low carbon steel, aluminum alloy, or plastic steel.

11. The connection piece is A first portion connected to one side panel of the housing; a second portion disposed on a side of the first portion away from the side plate and fixedly connected to the box body; a third portion fixedly connected between the first portion and the second portion; 10. The battery pack of claim 9, comprising:

12. The battery pack according to claim 11 , wherein the third portion is disposed at an angle.

13. the third portion includes a plurality of connecting segments, and two ends of each connecting segment are fixedly connected to the first portion and the second portion; The battery pack of claim 11 , wherein a gap is provided between two adjacent connecting segments.

14. 14. The battery pack of claim 13, further comprising a second adjustment connection piece capable of undergoing plastic deformation, the second adjustment connection piece fixedly connected to the first portion and the second portion and positioned within the gap.

15. the first portion is fixedly connected to one of the side plates by a threaded fastener; The battery pack of claim 11 , wherein the second portion and the box body are fixedly connected by a threaded fastener.

16. The first portion is welded and fixed to the side plate; The battery pack according to claim 11 , wherein the second portion is welded and fixed to the box body.

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