Solid state battery

Abstract

The utility model relates to the technical field of batteries, and particularly provides a solid-state battery, which comprises a shell, a battery module, a battery module, a battery module and a battery module, and is characterized in that the shell comprises a bottom wall and a top wall opposite to each other along a first direction; the battery cell is arranged in the shell; the battery cell comprises a battery cell main body and a first tab, one side of the battery cell main body along the second direction is provided with a first end face, the first tab is led out from the first end face of the battery cell main body, and the second direction is perpendicular to the first direction; the first pole assembly comprises a first pole body and a first terminal plate, one end of the first pole body penetrates through the top wall in the first direction and is connected with the first terminal plate, and the other end of the first pole body extends in the first direction and is connected with the bottom wall; and the first column body is electrically connected with the first tab. Compression is achieved through cooperation of the shell and the pole assembly, and the interface contact and discharge efficiency is improved. The introduction of an additional pressurizing device is avoided, the influence on the space utilization rate and the energy density of the battery is smaller, and the cost is lower.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a solid-state battery. BACKGROUND

[0002] Generally, the thermal runaway of a lithium battery is caused by mechanical abuse, electrical abuse or thermal abuse; wherein the mechanical abuse refers to the stress on the outside of the battery due to collision, extrusion, etc.; the electrical abuse refers to the internal and external short circuit or overcharge, overdischarge of the battery; and the thermal abuse refers to the external heating of the battery.

[0003] The all-solid-state battery completely replaces the liquid electrolyte with a solid-state electrolyte, which has high stability, does not volatilize, does not leak, etc., and has good compatibility with metal lithium, which can effectively solve the problem of thermal runaway and improve the safety of the battery.

[0004] However, the solid-state battery cannot fully infiltrate the positive and negative electrodes due to the absence of liquid electrolyte, and the solid-solid interface contact between the solid-state electrolyte and the positive and negative electrodes deteriorates with battery cycling. In view of the interface contact problem of the solid-state battery, an external device is currently added to the module or battery pack for pressurization, which is high in cost and affects the energy density and thermal diffusion of the battery cell. SUMMARY

[0005] The solid-state battery provided by the embodiments of the present application at least solves the problem of insufficient solid-solid interface contact of the solid-state battery.

[0006] The embodiments of the present application provide a solid-state battery, which comprises:

[0007] A shell, wherein the shell comprises a bottom wall and a top wall oppositely arranged along a first direction;

[0008] A battery cell, wherein the battery cell is arranged in the interior of the shell; the battery cell comprises a battery cell main body and a first tab, the battery cell main body has a first end face on one side along a second direction, the first tab is led out from the first end face of the battery cell main body, and the second direction and the first direction are perpendicular to each other;

[0009] A first pole assembly, wherein the first pole assembly comprises a first pole and a first terminal plate, one end of the first pole penetrates through the top wall along the first direction and is connected with the first terminal plate, the other end of the first pole extends along the first direction and is connected with the bottom wall; and the first pole and the first tab are electrically connected.

[0010] The solid-state battery provided by the embodiment of the application further comprises a second tab, the polarity of the second tab is opposite to that of the first tab, the second tab is led out from the first end surface of the battery body, and the second tab and the first tab are arranged at intervals along a third direction; the third direction and the second direction are perpendicular to each other.

[0011] The solid-state battery further comprises a second pole assembly, the second pole assembly comprises a second pole body and a second terminal plate, one end of the second pole body penetrates through the top wall along the first direction and is connected with the second terminal plate, and the other end of the second pole body extends along the first direction and is connected with the bottom wall.

[0012] The second pole body and the second tab are electrically connected; the first pole assembly and / or the second pole assembly are arranged in an insulating manner with the shell.

[0013] The solid-state battery provided by the embodiment of the application further comprises a first connecting piece and a second connecting piece, a plurality of battery bodies are arranged, the plurality of battery bodies are divided into two groups, the first end surfaces of the two groups of battery bodies face each other and leave a first gap.

[0014] In the first gap, the first tabs of the plurality of battery bodies are connected with the first connecting piece, and the first connecting piece is connected with the first pole body; the second tabs of the plurality of battery bodies are connected with the second connecting piece, and the second connecting piece is connected with the second pole body.

[0015] The solid-state battery provided by the embodiment of the application further comprises a first insulating plate, the first insulating plate is arranged in an insulating manner between the first connecting piece and the second connecting piece; the first insulating plate is sleeved on the first pole body and / or the second pole body.

[0016] The first pole body and the second pole body both penetrate through the first connecting piece, the first pole body and the first connecting piece are electrically connected; the first connecting piece and the second pole body are arranged in an insulating manner; the second pole body penetrates through the second connecting piece, and the second pole body and the second connecting piece are electrically connected.

[0017] The bottom wall comprises a first main plate and a supporting piece, the supporting piece is arranged on the side of the first main plate facing the top wall, and the first pole body and the second pole body are both threadedly connected with the supporting piece.

[0018] The bottom wall comprises a first main plate and a supporting piece, the supporting piece is arranged on the side of the first main plate facing the top wall, and the first pole body and the second pole body are both threadedly connected with the supporting piece.

[0019] The solid-state battery provided by the embodiment of the application has two columnar supports, and the two columnar supports are provided with first threaded holes.

[0020] The solid-state battery provided by the embodiment of the application has a support in the form of a boss, and the boss is provided with two second threaded holes.

[0021] The solid-state battery provided by the embodiment of the application further comprises a peripheral wall connected to the top wall and the bottom wall.

[0022] A first positioning plate is arranged in the first gap, and the first positioning plate is connected to the peripheral wall and abuts against the first end surface of each of the two battery cells in the second direction.

[0023] In addition, each group of battery cells comprises at least two battery cells arranged at intervals in a third direction, and a second positioning plate is arranged between two adjacent battery cells in the third direction, and the second positioning plate is connected to the peripheral wall.

[0024] The top wall of the solid-state battery provided by the embodiment of the application comprises a second main plate and a second insulating plate connected to one side of the second main plate facing the bottom wall.

[0025] The solid-state battery provided by the embodiment of the application realizes the compression of the battery cells through the cooperation of the shell structure and the pole assembly, improves the interface contact in the solid-state battery, and further improves the battery activity and discharge efficiency. Compared with the prior art, the additional pressing device can be avoided, the battery space is not occupied, the influence on the battery space utilization and energy density is smaller, and the manufacturing and production cost is lower. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings described herein are used to provide further understanding of the present application, form a part of the present application, and are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0027] Figure 1 is a top view of the solid-state battery inside the embodiment of the application.

[0028] Figure 2 is Figure 1 is a schematic view of the arrangement of the battery cells in the solid-state battery.

[0029] Figure 3 is a structural schematic view of the peripheral wall and the bottom wall of the shell in one embodiment of the application.

[0030] Figure 4 is Figure 3 is a schematic view of a cross-sectional structure of the solid-state battery along the A-A' direction in the embodiment shown.

[0031] Figure 5 is a schematic view of a structure of the shell peripheral wall and the bottom wall in another embodiment of the present application.

[0032] Figure 6 is a schematic view of a cross-sectional structure of the solid-state battery along the B-B' direction in the embodiment shown. Figure 5

[0033] Figure 7 is a schematic view of a cross-sectional structure of the solid-state battery along the B-B' direction in the embodiment shown. Figure 6

[0034] wherein the above-mentioned drawings include the following reference signs:

[0035] 1 - shell; 11 - bottom wall; 1101 - first main plate; 12 - top wall; 1201 - second main plate; 13 - peripheral wall; 1301 - first positioning plate; 1302 - second positioning plate; 2 - battery cell; 21 - battery cell main body; 2201 - first end face; 2202 - second end face; 22 - first tab; 23 - second tab; 3 - first pole assembly; 31 - first pole; 32 - first terminal plate; 4 - second pole assembly; 41 - second pole; 42 - second terminal plate; 51 - first connecting piece; 5101 - avoiding hole; 52 - second connecting piece; 53 - first insulation plate; 61 - first gap; 62 - second gap; 7 - support; 71 - pole; 7101 - first threaded hole; 72 - boss; 7201 - second threaded hole; 8 - recess; 9 - second insulation plate. DETAILED DESCRIPTION

[0036] It should be noted that the embodiments and features in the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with embodiments.

[0037] It should be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that the terms "comprise" and / or "include" as used in the specification indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0038] ​​The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the examples herein are not intended to limit the scope of the application unless specifically so stated. It is to be understood that the actual dimensions of the various parts shown in the drawings are not necessarily to scale, and that the dimensions can be arbitrarily set forth for the clarity of presentation and because it is the intent of the inventor to provide the best description of the application. Techniques, methods, and apparatus known to those of ordinary skill in the art can not be discussed in detail, but can be assumed by those of ordinary skill in the art to be a part of a structure for the invention. In all examples shown and discussed herein, any specific value should be interpreted as merely an example, and not as a limitation. Thus, other examples of the exemplary embodiments can have different values. It is to be noted that like numbers and letters refer to like elements throughout the several views of the drawings, and that the drawings are not necessarily to scale as the emphasis is generally upon the functional teaching rather than the precise dimensions thereof. Embodiment one

[0039] Lithium-ion batteries are prone to thermal runaway in the case of mechanical abuse, electrical abuse, and thermal abuse. Solid-state electrolytes in solid-state batteries can solve some thermal runaway problems caused by electrolytes, but they introduce interface contact problems. Because they cannot fully infiltrate the positive and negative electrodes like flowing electrolytes, the solid-solid contact interface between the solid-state electrolyte and the positive and negative electrodes will deteriorate with battery cycling, affecting battery life and becoming a problem hindering the development of all-solid-state batteries.

[0040] For solid-state batteries, the activity of the battery has an important influence on the discharge efficiency: the more fully the interface contacts, the greater the battery activity, and the more ideal the discharge efficiency.

[0041] Although small-capacity battery cells can maintain certain interface contact, the field of small-capacity battery cells is relatively narrow, and there are fewer electrical equipment that can be adapted. For new energy vehicles in the power field, small-capacity solid-state batteries cannot meet the user's requirements in terms of endurance.

[0042] In larger-capacity solid-state batteries, by increasing the pressure of the solid-solid interface contact, the contact between the solid-state electrolyte and the positive and negative electrodes is more complete, thereby improving the activity of the battery and increasing the discharge efficiency of the solid-state battery.

[0043] In the prior art, a pressurizing device is added externally to large-capacity solid-state batteries to improve interface contact, but the additional pressurizing device increases the manufacturing cost of the battery. At the same time, the pressurizing device occupies a certain space, reducing the energy density of the battery; the structural changes caused by the external pressurizing device are also not conducive to the formation of solid-state batteries, and they also hinder the thermal diffusion of the battery, increasing the risk of thermal runaway.

[0044] Accordingly, the embodiment provides a solid-state battery, which comprises a shell 1, an electric core 2, a first pole post assembly 3 and a second pole post assembly 4. The solid-state battery provided by the embodiment can realize the compression of the electric core without introducing additional pressure devices, and the structure for compression simultaneously serves as a conductive member in the battery composition, thereby avoiding the influence on the energy density of the battery and the battery composition. The solid-state battery provided by the embodiment can continuously ensure the contact of the solid-solid interface while providing a larger battery capacity, thereby improving the battery activity and overcoming the problem of limited use of solid-state batteries in the power field, and providing a comprehensive and effective solid-state battery design in terms of safety performance, battery capacity, discharge efficiency and space utilization.

[0045] Specifically, referring to FIGS. 1 to 3, Figure 4 The shell 1 comprises a bottom wall 11 and a top wall 12 oppositely arranged along a first direction; the shell 1 further comprises a peripheral wall 13 between the top wall 12 and the bottom wall 11, and connecting the top wall 12 and the bottom wall 11. The top wall 12, the bottom wall 11 and the peripheral wall 13 jointly form a closed space for accommodating the electric core 2.

[0046] Specifically, referring to FIGS. 1 to 3, Figure 1 and Figure 2 The electric core 2 is arranged inside the shell 1. The electric core 2 comprises an electric core body 21, which comprises a first end face 2201 and a second end face 2202, wherein the first end face 2201 is an end face of the electric core body 21 along a second direction, the second end face 2202 is an end face of the electric core body 21 along a third direction, and the first end face 2201 is adjacent to the second end face 2202. The first direction, the second direction and the third direction are perpendicular to each other.

[0047] In succession, referring to FIGS. 1 to 3, Figure 1 and Figure 2 The electric core 2 further comprises a first tab 22 and a second tab 23, and the polarity of the first tab 22 is opposite to that of the second tab 23. The first tab 22 and the second tab 23 are both led out from the first end face 2201 of the electric core body 21; and the first tab 22 and the second tab 23 are arranged in the third direction.

[0048] Specifically, referring to FIGS. 1 to 3, Figure 1 , Figure 2 and Figure 4 The first pole post assembly 3 has the same polarity as the first tab 22, and the first pole post assembly 3 comprises a first pole post 31 and a first terminal plate 32 connected with each other. The first pole post 31 is electrically connected with the first tab 22 and leads the first tab 22 out of the shell 1 to the first terminal plate 32, thereby facilitating the use of the battery in composition.

[0049] Further, the top wall 12 of the shell 1 is provided with a first through hole for mounting the first pole post assembly 3. One end of the first pole post 31 is arranged to penetrate the top wall 12 of the shell 1 and is arranged in the first through hole; the other end of the first pole post 31 is connected to the bottom wall 11 of the shell 1. The end of the first pole post 31 penetrating the top wall 12 is connected to the first terminal plate 32. The first pole post 31 is arranged to penetrate the top wall 12, and the cross-sectional radius of the first pole post 31 is smaller than the first terminal plate 32, which is located outside the shell 1 and is limited to the outer surface of the top wall 12 of the shell 1.

[0050] Specifically, as shown in Figure 1 , Figure 2 and Figure 4 , the second pole post assembly 4 is of the same polarity as the second tab 23, and the second pole post assembly 4 includes a second pole post 41 and a second terminal plate 42 connected thereto. The second pole post 41 is electrically connected to the second tab 23 and electrically leads the second tab 23 out of the shell 1 to the second terminal plate 42, facilitating the use of the battery in groups.

[0051] Further, the top wall 12 of the shell 1 is provided with a second through hole for mounting the second pole post assembly 4. One end of the second pole post 41 is arranged to penetrate the top wall 12 of the shell 1 and is arranged in the second through hole; the other end of the second pole post 41 is connected to the bottom wall 11 of the shell 1. The end of the second pole post 41 penetrating the top wall 12 is connected to the second terminal plate 42. The second pole post 41 is arranged to penetrate the top wall 12, and the cross-sectional radius of the second pole post 41 is smaller than the second terminal plate 42, which is located outside the shell 1 and is limited to the outer surface of the top wall 12 of the shell 1.

[0052] It should be noted that the first pole post assembly 3 and / or the second pole post assembly 4 are arranged to be insulated from the shell 1. The first pole post 31 and the second pole post 41 both extend in the first direction, perpendicular to the top wall 12 and the bottom wall 11 of the shell 1, at which time the extension length of the first pole post 31 and the second pole post 41 in the shell 1 is the shortest. In the first aspect, the first pole post assembly 3 and the second pole post assembly 4 serve as electrically conductive members to electrically connect and lead out the tabs of the battery cell 2, and the shortest extension length in the shell 1 makes the length of the current flowing in the pole post assembly the shortest when led out, resulting in the smallest internal resistance, which can improve the discharge efficiency of the battery and reduce the heat generation of the battery. In the second aspect, the first pole post assembly 3 and the second pole post assembly 4 also serve as compression members to compress the battery cell 2 in the shell 1, and the perpendicular arrangement can better compress the force. In the third aspect, the first pole post 31 and the second pole post 41 do not occupy too much space inside the shell 1 when the extension length is the shortest, improving the space utilization and energy density.

[0053] Specifically, the electrical connection between the first tab 22 and the first column 31, and the electrical connection between the second tab 23 and the second column 41 are preferably achieved by connecting pieces. The first tab 22 is electrically connected to the first column 31 by a first connecting piece 51, and the second tab 23 is electrically connected to the second column 41 by a second connecting piece 52, and the first connecting piece 51 and the second connecting piece 52 are insulated.

[0054] Further, in the present embodiment, a plurality of battery cells 2 are provided, and the plurality of battery cells 2 are all accommodated in the shell 1. Referring to Figure 2 As shown, the plurality of battery cells 2 are divided into two groups, and the first end faces 2201 of the two groups of battery cells 2 are oppositely arranged towards each other along the second direction, and each of the battery cells 2 in each group of battery cells 2 is arranged in sequence along the third direction. There is a first gap 61 between the first end faces 2201 of the two groups of battery cells 2, and there is a second gap 62 between the second end faces 2202 of each of the battery cells 2 in each group of battery cells 2. Since the first tab 22 and the second tab 23 are both led out from the first end face 2201, when the two groups of battery cells 2 are oppositely arranged, the tab groups are both located in the first gap 61.

[0055] In succession, referring to Figure 1 As shown, in the first gap 61, the first tabs 22 of the plurality of battery cells 2 are all connected to the first connecting piece 51, and the first connecting piece 51 is located in the first gap 61 and extends along the third direction. The first connecting piece 51 is electrically connected to the first column 31, specifically, the first connecting piece 51 is provided with a first mounting hole penetrating along the first direction, the first column 31 is arranged in the first mounting hole and in contact with the hole wall of the first mounting hole, so that the first column 31 and the first connecting piece 51 are electrically connected, further, in order to ensure stable connection, the first column 31 is connected to the first connecting piece 51 by welding after penetrating the first mounting hole.

[0056] In the first gap 61, the second tabs 23 of the plurality of battery cells 2 are all connected to the second connecting piece 52, and the second connecting piece 52 is located in the first gap 61 and extends along the third direction. The second connecting piece 52 is electrically connected to the second column 41, specifically, the second connecting piece 52 is provided with a second mounting hole penetrating along the first direction, the second column 41 is arranged in the second mounting hole and in contact with the hole wall of the second mounting hole, so that the second column 41 and the second connecting piece 52 are electrically connected, further, in order to ensure stable connection, the second column 41 is connected to the second connecting piece 52 by welding after penetrating the second mounting hole.

[0057] It should be noted that, in order to insulate the first tab 22, the first connecting piece 51, the first pole assembly 3, and the second tab 23, the second connecting piece 52, and the second pole assembly 4, the solid-state battery further includes a first insulating plate 53, which is arranged between the first connecting piece 51 and the second connecting piece 52. Referring to Figure 1 ,Figure 2 and Figure 4 As shown in FIG. 1, the first connecting piece 51 arranged in the first gap 61 and the second connecting piece 52 also arranged in the first gap 61 are arranged in a stack in the first direction.

[0058] In the first direction, the first insulating plate 53 is located between the first connecting piece 51 and the second connecting piece 52 arranged in a stack.

[0059] In the third direction, the first connecting piece 51 and the second connecting piece 52 can be arranged as a whole extending in the third direction, or as a plurality of parts arranged in the third direction. The length of the first connecting piece 51 and the second connecting piece 52 in the third direction is determined according to the distance between the first tab 22 and the second tab 23 connected thereto in the third direction. The maximum value of the length of the first connecting piece 51 or the second connecting piece 52 extending in the third direction is L1, which is the maximum distance between the tabs of the same polarity of the two cells 2 farthest apart in the third direction; the minimum value of the length of the first connecting piece 51 or the second connecting piece 52 extending in the third direction is L2, which is the minimum distance between the tabs of the same polarity of the two adjacent cells 2 in the third direction. The extension length of the first insulating plate 53 in the third direction is greater than or equal to L2 and less than or equal to L1. If the length of the first insulating plate 53 is too large and exceeds the length of the connecting piece, it will affect the space utilization in the battery; if the length of the first insulating plate 53 is too small and less than the length of the connecting piece, internal short circuit is easy to occur, which will cause safety accidents.

[0060] In addition, since the first column 31 and the second column 41 are arranged in the shell 1 and need to be electrically connected with the connecting piece, as shown in FIG. 1, the penetration position of the first column 31 and the second column 41 is also located in the first gap 61. Figure 6 and Figure 7 In the penetration of the first insulating plate 53, the first insulating plate 53 is provided with a third through hole for the first column 31 and / or the second column 41 to pass through, and the first insulating plate 53 is sleeved on the outer periphery of the first column 31 and / or the second column 41. The aperture of the third through hole is consistent with the cross-sectional radius of the first column 31 and / or the second column 41, so as to avoid short circuit caused by shaking of the conductive column.

[0061] In the penetration of the first connecting piece 51, the first column 31 is arranged in the first through hole, and the second column 41 is arranged in the avoiding hole 5101 of the first connecting piece 51. The aperture of the first through hole is consistent with the cross-sectional radius of the first column 31, and the aperture of the avoiding hole 5101 is larger than the cross-sectional radius of the second column 41, so that the first connecting piece 51 is electrically connected with the first column 31 and insulated from the second column 41.

[0062] Afterwards, when the second connecting sheet 52 is penetrated, the first column 31 is arranged in the avoiding hole 5101 of the second connecting sheet 52, and the second column 41 is arranged in the second through hole. The diameter of the second through hole is consistent with the cross-sectional radius of the second column 41, and the diameter of the avoiding hole 5101 is greater than the cross-sectional radius of the first column 31, so that the second connecting sheet 52 is electrically connected with the second column 41 and is insulated from the first column 31.

[0063] Specifically, in the embodiment, the bottom wall 11 of the shell 1 comprises a first main plate 1101 and a support 7, and the support 7 is arranged on the side of the first main plate 1101 facing the top wall 12; or the side of the bottom wall 11 facing the top wall 12 is provided with the support 7.

[0064] When the bottom wall 11 comprises the first main plate 1101 and the support 7, one end of the first column 31 away from the first terminal plate 32 is specifically connected to the support 7 of the bottom wall 11 and is threadedly connected with the support 7; one end of the second column 41 away from the second terminal plate 42 is specifically connected to the support 7 of the bottom wall 11 and is threadedly connected with the support 7. That is, the support 7 is used to fix the first column 31 and / or the second column 41.

[0065] When the side of the bottom wall 11 facing the top wall 12 is provided with the support 7, the support 7 is used to support the first connecting sheet 51, the first insulating plate 53 and the second connecting sheet 52 arranged in layers in the first direction, that is, the support 7 is used to support the tabs and the connecting sheets in the first gap 61, and the support 7 is insulated from the tabs and the connecting sheets. Figure 4 Specifically, the support 7 is insulated from the first connecting sheet 51.

[0066] Further, as shown in Figure 3 , in some embodiments of the embodiment, the support 7 can be arranged as a plurality of separate columns 71. In Figure 4 , the support 7 is arranged as two separate columns 71 corresponding to the first column 31 and the second column 41, and the two columns 71 are both provided with a first threaded hole 7101 for threadedly connecting with the column in the pole assembly. The end face of the column 71 of the support 7 is used to support the tabs and the connecting sheets.

[0067] Afterwards, the number of the columns 71 and the position of the columns 71 in the first gap 61 can be arranged according to the electrical connection needs and the pressing needs.

[0068] Further, in the embodiment, the top wall 12 of the shell 1 comprises a second main plate 1201 and a second insulating plate 9 connected to the side of the second main plate 1201 facing the bottom wall 11.

[0069] It should be noted that the second main plate 1201 and the second insulating plate 9 are arranged in an integral molding structure and are integrally molded; the top wall 12 and the peripheral wall 13 of the shell 1 are arranged in a detachable connection. The material of the second insulating plate 9 is one of polyethylene (PE), polypropylene (PP), and polyethylene terephthalate (PET). The thickness of the second insulating plate 9 in the first direction is 0.5 mm.

[0070] The first column 31 and the second column 41 are arranged as threaded columns; when the first column 31 is rotated through the first terminal plate 32 and / or the second column 41 is rotated through the second terminal plate 42, the first threaded hole 7101 of the support 7 is threadedly matched, the top wall 12 is moved downward and is crimped, the top wall 12 is moved in the first direction to the bottom wall 11, the internal battery cell 2 is compressed, the interface contact and the discharge efficiency are improved, and then the second main plate 1201 and the peripheral wall 13 of the shell 1 are welded and fixed to complete the compression work of the battery cell 2.

[0071] Further, in the embodiment, the peripheral wall 13 of the shell 1 is further provided with a first positioning plate 1301 and / or a second positioning plate 1302, which are used to fix the battery cell 2 inside the shell 1 in the second and third directions, so as to avoid the short circuit caused by the shaking displacement of the battery cell 2. The safety performance of the battery is improved under the working conditions such as vibration. When the shell 1 is arranged as an aluminum shell, the first positioning plate 1301 and / or the second positioning plate 1302 are arranged as aluminum plates and are welded and formed with the peripheral wall 13.

[0072] The first positioning plate 1301 is arranged in the first gap 61. In the second direction, the first positioning plate 1301 abuts against the first end surface 2201 of the two oppositely arranged battery cell bodies 21. In order to reduce the weight of the battery, the first positioning plate 1301 can be arranged to abut against the first end surface 2201 of two groups of battery cell bodies 21. In the third direction, one end of the first positioning plate 1301 is connected with the peripheral wall 13, and the other end has a gap with the first connecting piece 51, the second connecting piece 52, and the tab, so as to avoid interference with the electrical connection structure.

[0073] The second positioning plate 1302 is arranged in the second gap 62. Each group of battery cells 2 includes at least two battery cells 2 arranged at intervals in the third direction, and the second positioning plate 1302 is arranged between the two adjacent battery cells 2 in the third direction and abuts against the second end surface 2202 of the two adjacent battery cell bodies 21. In the second direction, one end of the second positioning plate 1302 is connected with the peripheral wall 13, and the other end has a gap with the first connecting piece 51 and the second connecting piece 52, so as to avoid interference with the electrical connection structure.

[0074] Reference Figure 5As shown, in some other embodiments of the present embodiment, the support 7 can be provided as a boss 72. In Figure 4 The boss 72 corresponds to the first column 31 and the second column 41 to provide two second threaded holes 7201 for threaded connection with the column in the pole assembly. The top surface of the boss 72 of the support 7 is used to support the tab and the connecting piece.

[0075] In succession, the number of the second threaded holes 7201 and the position of the second threaded holes 7201 in the first gap 61 can be set according to the electrical connection needs and the pressing needs.

[0076] In succession, when the support 7 is provided as the boss 72, the bottom wall 11 is recessed on the side away from the top wall 12 to form a recessed cavity 8, and the position of the recessed cavity 8 corresponds to the position of the boss 72. During high-rate charging and discharging, a large amount of heat will be generated, which is one of the reasons for thermal runaway. In the field of power vehicles, such thermal runaway is extremely easy to threaten the personal safety of the driver and passengers. The recessed cavity 8 can accommodate a heat dissipation member to dissipate heat for the battery cell 2 in the shell 1, control the working temperature, improve the thermal management of the solid-state battery, and avoid thermal runaway.

[0077] Specifically, the solid-state battery provided in the present embodiment further comprises an explosion-proof valve. The outer periphery of the first terminal plate 32 in the first pole assembly 3 can be welded with a conductive structure as a first pole, and the outer periphery of the second terminal plate 42 in the second pole assembly 4 can be welded with a conductive structure as a second pole. The explosion-proof valve is arranged between the adjacent first pole and the second pole.

[0078] The inventors have found that the battery applied in the power field not only has high requirements on capacity and cycle performance, but also requires the height of the battery to meet the requirements of the chassis space of a passenger vehicle. The existing square battery module includes vertical and side-lying types. The vertical battery has its poles upward, and the internal single battery cell is vertically placed, resulting in a high height. The poles of the side-lying battery are led out toward the side, and the small area of the side downward placed also leads to a high height of the module.

[0079] In the present embodiment, the battery cell 2 is placed flat and the pole is led out from the side with a large area of the battery. The capacity of the battery module assembled can meet the demand of the user's endurance, and the solid-state battery with the structure of the present application can be freely assembled, and the shape and capacity can be adjusted. The problem of the capacity of the battery cell being limited due to the interface contact of the traditional solid-state battery is solved. Embodiment Two

[0080] The present embodiment two further provides a power utilization device comprising the solid-state battery in the above-mentioned embodiment one, and therefore, the power utilization device comprises all the technical effects of the solid-state battery. Since the technical effects of the solid-state battery have been described in detail in the foregoing, they will not be described herein again.

[0081] For purposes of the description hereinafter, spatial relative terms, such as "above", "below", "upper", "lower", and the like, can be used to describe the relative position of one device or feature to another as illustrated in the figures. It will be understood that the spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if a device in the figures is inverted, then a device described as "above" or "up" of other devices or structures can be oriented "below" or "down" relative to such other devices or structures. Accordingly, the exemplary terms "above" and "below" can encompass both an orientation of above and below. The devices can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0082] In addition, it is to be noted that the terms "first", "second", and the like, used herein do not necessarily have any specific meaning, unless otherwise explicitly defined by the context of the specification. They are used merely as a matter of convenience, to name different components of the application, to distinguish the components from each other.

[0083] The preferred embodiments of the application are shown and described above. However, the application can be modified in various ways without departing from the spirit and scope of the application. Therefore, the scope of the application should be determined not by the preferred embodiments but by the appended claims, and their equivalents.

Claims

1. A solid-state battery, characterized by, The application relates to a solid-state battery, which comprises the following components: a shell (1) comprising a bottom wall (11) and a top wall (12) oppositely arranged along a first direction; an electric core (2) arranged in the interior of the shell (1); the electric core (2) comprises an electric core body (21) and a first tab (22), the electric core body (21) has a first end face (2201) on one side along a second direction, the first tab (22) is led out from the first end face (2201) of the electric core body (21), and the second direction and the first direction are perpendicular to each other; a first pole assembly (3) comprising a first column (31) and a first terminal plate (32), one end of the first column (31) penetrates through the top wall (12) along the first direction and is connected with the first terminal plate (32), the other end of the first column (31) extends along the first direction and is connected with the bottom wall (11); wherein the first column (31) and the first tab (22) are electrically connected.

2. The solid-state battery of claim 1, wherein, The electric core (2) further comprises a second tab (23) opposite in polarity to the first tab (22); the second tab (23) is led out from the first end face (2201) of the electric core body (21), and the second tab (23) and the first tab (22) are arranged at intervals along a third direction; the third direction and the second direction are perpendicular to each other; The solid-state battery further comprises a second pole assembly (4) comprising a second column (41) and a second terminal plate (42), one end of the second column (41) penetrates through the top wall (12) along the first direction and is connected with the second terminal plate (42), the other end of the second column (41) extends along the first direction and is connected with the bottom wall (11); The second column (41) and the second tab (23) are electrically connected; the first pole assembly (3) and / or the second pole assembly (4) are arranged in insulation with the shell (1).

3. The solid-state battery of claim 2, wherein, Further comprising a first connecting sheet (51) and a second connecting sheet (52), the electric core (2) is arranged in plurality, the plurality of electric cores (2) are divided into two groups, the first end faces (2201) of the two groups of electric cores (2) face each other and leave a first gap (61); In the first gap (61), the first tabs (22) of the plurality of electric cores (2) are all connected with the first connecting sheet (51), and the first connecting sheet (51) is connected with the first column (31); the second tabs (23) of the plurality of electric cores (2) are all connected with the second connecting sheet (52), and the second connecting sheet (52) is connected with the second column (41).

4. The solid-state battery of claim 3, wherein, Further comprising a first insulation plate (53) arranged in insulation between the first connecting sheet (51) and the second connecting sheet (52); the first insulation plate (53) is sleeved on the first column (31) and / or the second column (41). The first column (31) and the second column (41) both penetrate the first connecting sheet (51), and the first column (31) and the first connecting sheet (51) are electrically connected; the first connecting sheet (51) and the second column (41) are insulatively arranged; the second column (41) penetrates the second connecting sheet (52), and the second column (41) and the second connecting sheet (52) are electrically connected.

5. The solid-state battery of claim 2, wherein, The bottom wall (11) comprises a first main plate (1101) and a support (7), the support (7) is arranged on a side of the first main plate (1101) facing the top wall (12), and the first column (31) and the second column (41) are both threadedly connected with the support (7).

6. The solid-state battery of claim 4, wherein, A side of the bottom wall (11) facing the top wall (12) is provided with a support (7), the first connecting sheet (51) is arranged on the support (7), and the support (7) and the first connecting sheet (51) are insulatively arranged.

7. The solid-state battery according to claim 5 or 6, characterized in that, The support (7) is two columns (71), and each column (71) is provided with a first threaded hole (7101); or the support (7) is a boss (72), and the boss (72) is provided with two second threaded holes (7201).

8. The solid-state battery according to claim 5 or 6, characterized by The support (7) is a boss (72); a side of the bottom wall (11) away from the top wall (12) is recessed to form a recessed cavity (8), and the position of the recessed cavity (8) corresponds to the position of the boss (72); wherein the recessed cavity (8) is configured to accommodate a heat dissipation member.

9. The solid-state battery of claim 3, wherein, The shell (1) further comprises a peripheral wall (13) connecting the top wall (12) and the bottom wall (11); A first positioning plate (1301) is arranged in the first gap (61); the first positioning plate (1301) is connected with the peripheral wall (13), and in a second direction, the first positioning plate (1301) respectively abuts against first end surfaces (2201) of two battery cells (2); And / or, each group of battery cells (2) comprises at least two battery cells (2) arranged at intervals in a third direction, and a second positioning plate (1302) is arranged between two adjacently arranged battery cells (2) in the third direction; the second positioning plate (1302) is connected with the peripheral wall (13).

10. The solid-state battery of claim 1, wherein, The top wall (12) comprises a second main plate (1201) and a second insulating plate (9), and the second insulating plate (9) is connected to a side of the second main plate (1201) facing the bottom wall (11).

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