Battery module and double-layer battery

Abstract

The invention relates to a battery module and a double-layer battery. The battery module comprises a battery box which is provided with an accommodating cavity and a bottom plate; the battery unit comprises a first support, a plurality of single batteries and a plurality of protective sheets, the first support is arranged on one side of the bottom plate, each single battery is arranged on one side, away from the bottom plate, of the first support, and a plurality of through holes corresponding to the single batteries one to one are formed in the first support; a protection sheet is arranged between each battery monomer and the corresponding through hole, and each protection sheet is provided with a first thinning area; the protection plate is arranged between the first support and the bottom plate, a second thinning area is arranged on the protection plate, the first thinning area and the second thinning area are arranged in a staggered mode in the Z direction, and vent holes opposite to the second thinning area are formed in the bottom plate; and the explosion-proof valve is mounted on the battery box, and the bottom plate is provided with an airflow channel communicated with the vent hole and the explosion-proof valve.

Description

Technical Field

[0001] The present invention relates to the technical field of battery manufacturing, and in particular to a battery module and a double-layer battery. Background Art

[0002] With the development of new energy vehicle technology, in order to further improve vehicle endurance, it is necessary to configure more power within the limited space of the vehicle, that is, the energy density of the battery is increasingly required. In order to meet the current requirements for power, batteries usually need to be designed in a double layer, that is, one battery contains two layers of battery modules. However, when the battery cells in one layer of the battery module thermal runaway, the high-pressure gas generated is likely to have an adverse effect on the corresponding battery cells in the other layer of the battery module, thereby causing thermal runaway of other battery cells, resulting in poor safety performance of the double-layer battery. Summary of the invention

[0003] Based on this, it is necessary to provide a battery module and a double-layer battery that improve the above defects in order to address the problem in the prior art that when the battery cells in one layer of the battery module in a double-layer battery undergo thermal runaway, the high-pressure gas generated can easily have an adverse effect on the corresponding battery cells in the other layer of the battery module, thereby causing thermal runaway of other battery cells, resulting in poor safety performance of the double-layer battery.

[0004] In one aspect, the present application provides a battery module, comprising:

[0005] A battery box having a receiving cavity and a bottom plate serving as a side wall of the battery box;

[0006] A battery unit, comprising a first bracket, a plurality of battery cells and a plurality of protective sheets, all of which are located in the receiving cavity, wherein the first bracket is arranged on one side of the bottom plate, each of the battery cells is arranged along the Z direction on a side of the first bracket away from the bottom plate, the first bracket is provided with a plurality of through holes corresponding to each of the battery cells, the protective sheet is arranged between each of the battery cells and the corresponding through hole, and each of the protective sheets has a first thinned area that can be ruptured under the action of high-pressure gas; and

[0007] a protective plate, arranged between the first bracket and the bottom plate, the protective plate having a second thinned area that can be broken under the action of high-pressure gas, the first thinned area and the second thinned area are staggered in the Z direction, and the bottom plate is provided with a vent hole opposite to the second thinned area; and

[0008] An explosion-proof valve is installed on the battery box, and an air flow channel connecting the vent hole and the explosion-proof valve is provided on the bottom plate.

[0009] In one of the embodiments, the first bracket has a plurality of positioning grooves on the side facing away from the base plate, which are connected to the plurality of through holes in a one-to-one correspondence, and each of the battery cells is installed in each of the positioning grooves at one end along the Z direction, and each of the protective sheets is located in the positioning groove and is arranged between the corresponding battery cell and the through hole.

[0010] In one embodiment, the thickness of each of the first thinned regions is greater than the thickness of the second thinned regions.

[0011] In one embodiment, the base plate includes a first area and a second area arranged along the X direction, the protective plate is arranged on a side of the first area facing the receiving cavity, a surface of the first area facing away from the receiving cavity is recessed toward the protective plate to form a recessed space, and the vent is provided in the first area of ​​the base plate; a surface of the second area facing away from the receiving cavity is provided with an air flow groove, the air flow groove is connected to the explosion-proof valve and the recessed space, and the air flow groove and the recessed space form the air flow channel.

[0012] In one embodiment, the battery module also includes a partition plate arranged in the receiving cavity, and the partition plate is arranged between the first area and the second area of ​​the base plate along the Z direction to separate the receiving cavity into a battery cavity located on the side of the partition plate facing the first area and an electric control cavity located on the side of the partition plate facing the second area, the battery cavity is used to accommodate the battery unit, and the electric control cavity is used to accommodate electrical components.

[0013] In one embodiment, a surface of a side of the second region facing the electric control cavity is protruded into the electric control cavity relative to the first region, and a depth of the air flow groove is greater than a depth of the recessed space.

[0014] In one embodiment, the battery box includes a top plate and a plurality of side plates, the top plate is arranged opposite to the bottom plate, each of the side plates is connected between the top plate and the bottom plate, and together with the bottom plate and the top plate, encloses the receiving cavity;

[0015] The explosion-proof valve is arranged on one of the side plates, and a ventilation cavity is provided in the side plate on which the explosion-proof valve is arranged, and the ventilation cavity is communicated with the air flow groove and the explosion-proof valve.

[0016] On the other hand, the present application provides a double-layer battery, including a sealing ring and two battery modules as described in any of the above embodiments, the two battery modules are arranged relatively to each other and fixedly connected along the Z direction, and the bottom plates of the two battery modules are opposite to each other, and the airflow channels are opened on the sides of the two bottom plates facing each other, and the sealing ring is arranged between the bottom plates of the two battery modules for sealing the airflow channels on the two bottom plates.

[0017] In one of the embodiments, the ventilation holes on one of the base plates are arranged in a staggered manner with the ventilation holes on another adjacent base plate.

[0018] In one embodiment, the double-layer battery further includes a protective partition, a first support column and a second support column, wherein the protective partition is located between the two bottom plates, the first support column is supported between one of the bottom plates and the protective partition, and the second support column is supported between another adjacent bottom plate and the protective partition;

[0019] The vent holes on the two bottom plates are opposite to the protective baffle, so that the high-pressure gas discharged from each vent hole is sprayed onto the protective baffle.

[0020] Compared with the prior art, this application has the following beneficial effects:

[0021] In the battery module and double-layer battery described above, when one of the battery cells experiences thermal runaway, the high-pressure gas generated first breaks through the first thinned area on the corresponding protective sheet, and then passes through the corresponding through hole on the first bracket to enter the space between the first bracket and the protective plate. The high-pressure gas that enters the space between the first bracket and the protective plate breaks through the second thinned area on the protective plate, and then enters the air flow channel through the vent hole on the bottom plate. The high-pressure gas that enters the air flow channel reaches the explosion-proof valve along the air flow channel, and when the pressure on the explosion-proof valve reaches the preset pressure, the explosion-proof valve opens to release the pressure.

[0022] Since the first thinned areas on each protective sheet and the second thinned areas on the protective plate are staggered in the Z direction, after the high-pressure gas generated by thermal runaway of the battery cell breaks through the first thinned area on the corresponding protective sheet, the high-pressure gas will not directly impact the second thinned area on the protective plate, but will flow along the corresponding path in the space between the first bracket and the protective plate. The second thinned area will not rupture until the pressure at the second thinned area increases to a certain value. On the one hand, this is conducive to extending the path for removing the high-pressure gas, thereby extending the heat dissipation time, reducing the gas temperature reaching the explosion-proof valve, and avoiding damage to the explosion-proof valve due to excessive temperature; on the other hand, it avoids the high-pressure gas generated by thermal runaway of the battery cell from passing through the protective sheet, the through hole, the protective plate and the vent in turn along the Z direction to directly impact another battery module, causing the bottom plate and the battery cell of the other battery module to be damaged by impact and heat, thereby greatly improving the safety performance of the double-layer battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of a battery unit of a battery module in one embodiment of the present application;

[0024] Figure 2 for Figure 1 A schematic diagram of the structure of the battery unit shown in another viewing angle;

[0025] Figure 3 for Figure 2 The schematic diagram of the structure of the battery unit shown (protection plate omitted);

[0026] Figure 4 This is a schematic diagram of the structure of a double-layer battery in one embodiment of the present application;

[0027] Figure 5 for Figure 4 Schematic diagram of the exploded structure of the double-layer battery shown;

[0028] Figure 6 for Figure 4 The schematic diagram of the exploded structure of the double-layer battery shown in another perspective;

[0029] Figure 7 for Figure 4 A cross-sectional view of a double-layer battery is shown. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0036] See also Figures 1 to 5 An embodiment of the present application provides a double-layer battery, including two battery modules 10. Each battery module 10 includes a battery box 11, a battery cell 12, a protective plate 13 and an explosion-proof valve 14. The battery box 11 has a receiving cavity (not shown) and a bottom plate 111 serving as a side wall of the battery box 11. The battery cell 12 includes a first bracket 121, a plurality of battery cells 122 and a plurality of protective sheets 124, all of which are arranged in the receiving cavity. The first bracket 121 is arranged on one side of the bottom plate 111, and each battery cell 122 is uprightly arranged along the Z direction on the side of the first bracket 121 away from the bottom plate 111. The first bracket 121 is provided with a plurality of through holes 1211 (see Figure 3 ). A protective sheet 124 is provided between each battery cell 122 and the corresponding through hole 1211. Each protective sheet 124 has a first thinned area 1241 that can be broken under the action of high-pressure gas. The protective plate 13 is arranged between the first bracket 121 and the bottom plate 111, and the protective plate 13 has a second thinned area 131 that can be broken under the action of high-pressure gas. The first thinned area 1241 and the second thinned area 131 of each protective sheet 124 are staggered in the Z direction. A vent a6 opposite to the second thinned area 131 is provided on the bottom plate 111. The explosion-proof valve 14 is installed on the battery box 11, and the bottom plate 111 has an air flow channel (not shown) connecting the vent a6 and the explosion-proof valve 14. It should be noted that the staggered arrangement of the first thinning area 1241 and the second thinning area 131 of each protective sheet 124 in the Z direction means that the projection of the first thinning area 1241 of each protective sheet 124 on the protective plate 13 along the Z direction is located outside the second thinning area 131.

[0037] The two battery modules 10 are arranged opposite to each other along the Z direction and fixedly connected to each other. The bottom plates 111 of the two battery modules 10 are opposite to each other, and the above-mentioned airflow channels (not marked in the figure) are opened on the sides of the two bottom plates 111 facing each other. The double-layer battery also includes a sealing ring 20, which is arranged between the bottom plates 111 of the two battery modules 10 and is used to seal the airflow channels on the two bottom plates 111.

[0038] In the battery module 10 and double-layer battery, when one of the battery cells 122 experiences thermal runaway, the high-pressure gas generated first breaks through the first thinned area 1241 on the corresponding protective sheet 124, and then passes through the corresponding through hole 1211 on the first bracket 121 to enter the space between the first bracket 121 and the protective plate 13. The high-pressure gas entering the space between the first bracket 121 and the protective plate 13 breaks through the second thinned area 131 on the protective plate 13, and then enters the air flow channel through the vent a6 on the bottom plate 111. The high-pressure gas entering the air flow channel reaches the explosion-proof valve 14 along the air flow channel, and when the pressure on the explosion-proof valve 14 reaches the preset pressure, the explosion-proof valve 14 opens to release the pressure.

[0039] Since the first thinned area 1241 on each protective sheet 124 and the second thinned area 131 on the protective plate 13 are arranged in a staggered manner in the Z direction, after the high-pressure gas generated by the thermal runaway of the battery cell 122 breaks through the first thinned area 1241 on the corresponding protective sheet 124, the high-pressure gas will not directly impact the second thinned area 131 on the protective plate 13, but will flow along the corresponding path in the space between the first bracket 121 and the protective plate 13. When the pressure at the second thinned area 131 increases to a certain value, the second thinned area 131 will break. On the one hand, it is beneficial to extend the path for removing high-pressure gas, thereby improving the heat dissipation effect, reducing the gas temperature reaching the explosion-proof valve 14, and preventing the explosion-proof valve 14 from being damaged due to excessive temperature; on the other hand, it is prevented that the high-pressure gas generated by the thermal runaway of the battery cell 122 passes through the protective sheet 124, the through hole 1211, the protective plate 13 and the vent a6 in the Z direction in sequence and directly impacts the other battery module 10, causing the bottom plate 111 and the battery cell 122 of the other battery module 10 to be damaged by impact and thermal influence, thereby greatly improving the safety performance of the double-layer battery.

[0040] It should be noted that since a protective plate 13 is arranged between the first bracket 121 and the bottom plate 111, and the first thinning area 1241 on each protective sheet 124 and the second thinning area 131 on the protective plate 13 are staggered in the Z direction, the high-pressure gas that breaks through the first thinning area 1241 directly impacts the area outside the second thinning area 131 of the protective plate 13, thereby blocking the high-pressure gas from directly impacting the bottom plate 111 of the battery box 11, thereby greatly reducing the risk of melting through the bottom plate 111 of the battery box 11.

[0041] It should also be noted that, during the production and assembly process of the double-layer battery in the present application, the two battery modules 10 are first assembled separately, and then one of the battery modules 10 is stacked on the other battery module 10, and a sealing ring 20 is arranged between the two, and finally the battery box 11 of the two battery modules 10 is locked and fixed, so as to realize the assembly of one of the battery modules 10, the sealing ring 20 and the other battery module 10, and on the other hand, the sealing ring 20 is used to seal the air flow channel on the bottom plate 111. Compared with the solution of sharing a support mechanism in the prior art, the double-layer battery in the present application has a simple structure, which greatly simplifies the assembly process and assembly difficulty, thereby facilitating the improvement of assembly efficiency, and the locking force generated by locking and fixing the two battery modules 10 acts on the battery box 11, and will not be transmitted to the battery cell 12 inside the battery box 11, thereby avoiding the failure of the collector welding inside the battery cell 12 due to the stress on the battery cell pole of the battery cell 12.

[0042] Optionally, the protective plate 13 can be made of mica board, ceramic board, fireproof plastic board or other heat-resistant insulating material, as long as it has certain strength, high temperature resistance and insulation properties, and is not particularly limited here.

[0043] Optionally, the protective sheet 124 can be made of mica sheet, ceramic sheet, fireproof plastic sheet or other heat-resistant insulating material, as long as it has certain strength, high temperature resistance and insulation properties, and is not particularly limited here.

[0044] In the embodiment of the present application, the first bracket 121 has a plurality of positioning grooves 1212 on the side away from the bottom plate 111, which are connected to the plurality of through holes 1211 in a one-to-one correspondence. One end of each battery cell 122 along the Z direction is respectively installed in each positioning groove 1212. Each protective sheet 124 is located in the positioning groove 1212 and is arranged between the corresponding battery cell 122 and the through hole 1211, so that when the first thinning area 1241 on the protective sheet 124 is not broken, the protective sheet 124 isolates the through hole 1211 from the positioning groove 1212, and prevents the high-pressure gas entering the space between the first bracket 121 and the protective plate 13 from entering the positioning groove 1212 through the through hole 1211, thereby causing impact and thermal impact on the battery cell 122 that has not experienced thermal runaway. Each positioning groove 1212 on the first bracket 121 can play the role of positioning each battery cell 122 and each protective sheet 124, respectively, so that the structure of the battery unit 12 is more stable and reliable.

[0045] Specifically in the embodiment, the battery unit 12 further includes a second bracket 123, which is disposed at one end of each battery cell 122 away from the first bracket 121. The second bracket 123 is locked and fixed to the first bracket 121 by a screw, so that each battery cell 122 is clamped and fixed between the first bracket 121 and the second bracket 123, so that the first bracket 121, each battery cell 122 and the second bracket 123 are fixed as a whole.

[0046] Specifically in the embodiment, the thickness of the first thinned area 1241 on each protective sheet 124 is greater than the thickness of the second thinned area 131 on the protective plate 13. In this way, when thermal runaway occurs in some battery cells 122, the high-pressure gas generated breaks through the first thinned area 1241 on the corresponding protective sheet 124, and then enters the space between the first bracket 121 and the protective plate 13 through the corresponding through hole 1211 on the first bracket 121, so that the pressure in the space between the first bracket 121 and the protective plate 13 gradually increases. Since the thickness of the first thinning area 1241 is greater than the thickness of the second thinning area 131, the maximum pressure that the first thinning area 1241 can withstand is greater than the maximum pressure that the second thinning area 131 can withstand, thereby ensuring that the high-pressure gas entering the space between the first bracket 121 and the protective plate 13 can only break through the second thinning area 131 on the protective plate 13, and will not break through the first thinning area 1241 on the protective sheet 124, thereby ensuring that the high-pressure gas entering the space between the first bracket 121 and the protective plate 13 will not cause impact and thermal impact on other battery cells 122 that have not experienced thermal runaway, thereby greatly improving the safety performance of the battery module 10.

[0047] See also Figures 5 to 7In an embodiment of the present application, the bottom plate 111 includes a first area a1 and a second area a2 arranged along the X direction. The protective plate 13 is arranged on the side of the first area a1 of the bottom plate 111 facing the receiving cavity. The side surface of the first area a1 facing away from the receiving cavity is recessed toward the protective plate 13 to form a recessed space a4. The vent a6 is provided in the first area a1 of the bottom plate 111, thereby connecting the receiving cavity and the recessed space a4 on opposite sides of the bottom plate 111. An air flow groove a3 is provided on the side surface of the second area a2 facing away from the receiving cavity, and the air flow groove a3 is connected to the explosion-proof valve 14 and the recessed space a4. The air flow groove a3 and the recessed space a4 in the present application together form the above-mentioned air flow channel. In this way, when the battery cell 122 in the battery box 11 experiences thermal runaway, the high-pressure gas generated passes through the corresponding first thinning area 1241, the through hole 1211, the second thinning area 131 and the vent a6 in sequence to reach the recessed space a4, then enters the air flow groove a3 from the recessed space a4, and then reaches the explosion-proof valve 14 from the air flow groove a3, which is beneficial to extend the flow path of the high-pressure gas as much as possible, enhance the heat dissipation effect, and reduce the gas temperature reaching the explosion-proof valve 14.

[0048] Specifically in the embodiment, the battery module 10 also includes a partition plate 114 disposed in the receiving cavity of the battery box 11, and the partition plate 114 is vertically disposed between the first area a1 and the second area a2 of the bottom plate 111 along the Z direction to separate the receiving cavity of the battery box 11 into a battery cavity a9 and an electric control cavity a8. The battery cavity a9 is located on the side of the partition plate 114 facing the first area a1, and the battery cell 12 is accommodated in the battery cavity a9. The electric control cavity a8 is located on the side of the partition plate 114 facing the second area a2, and the electric control cavity a8 is used to arrange electrical components, such as a battery management system, a relay, etc. In this way, the battery cavity a9 and the electric control cavity a8 are respectively used to accommodate the battery cell 12 and the electrical components, so as to avoid mutual influence between the two and facilitate subsequent maintenance.

[0049] Furthermore, the side surface of the second area a2 facing the electric control cavity a8 is protruded into the electric control cavity a8 relative to the first area a1, and the depth of the air flow groove a3 is greater than the depth of the recessed space a4, so that the air flow groove a3 has a large enough space for high-pressure gas to pass through, increasing the capacity to accommodate high-pressure gas, enhancing the heat dissipation effect, and helping to reduce the temperature of the gas reaching the explosion-proof valve 14. It should be noted that, since there is surplus space in the electric control cavity a8 for accommodating electrical components, the second area a2 is protruded into the electric control cavity a8, occupying the space in the electric control cavity a8 and increasing the space in the air flow groove a3, that is, converting the surplus space in the electric control cavity a8 into the space in the air flow groove a3, avoiding the need to increase the thickness of the bottom plate 111 and causing an increase in the height of the double-layer battery.

[0050] Specifically in the embodiment, the battery box 11 further includes a plurality of side panels 113 and a top panel 112. The top panel 112 and the bottom panel 111 are arranged opposite to each other along the Z direction, and the plurality of side panels 113 are connected between the top panel 112 and the bottom panel 111 and connected end to end, so that the top panel 112, the bottom panel 111 and the side panels 113 are enclosed together to form the above-mentioned receiving cavity.

[0051] Furthermore, the explosion-proof valve 14 is installed on one of the side panels 113 of the battery box 11. The side panel 113 on which the explosion-proof valve 14 is installed has a ventilation cavity a7, and the ventilation cavity a7 is used to connect the explosion-proof valve 14 with the air flow groove a3 on the bottom plate 111. The internal space of the side panel 113 is used as the ventilation cavity a7, and there is no need to set up additional components to form the ventilation cavity a7, which is conducive to saving space.

[0052] Optionally, the side plate 113 equipped with the explosion-proof valve 14 is made of a profile plate, and the cavity in the profile plate is used as the ventilation cavity a7. In this way, the existing cavity in the profile plate is used as the ventilation cavity a7, which is conducive to simplifying the processing technology of the battery box 11 and reducing the processing difficulty and cost.

[0053] Specifically in the embodiment, the vent holes a6 on one base plate 111 are staggered with the vent holes a6 on another adjacent base plate 111 in the Z direction, thereby preventing the high-pressure gas ejected from the vent holes a6 on one base plate 111 from directly impacting the vent holes a6 on the other base plate 111 and the second thinned area 131 of the protective plate 13, thereby preventing cross-gas communication between the two battery modules 10.

[0054] Specifically in the embodiment, the double-layer battery also includes a protective baffle 40, a first support column 50 and a second support column 60. The protective baffle 40 is located between the bottom plates 111 of the two battery modules 10. The first support column 50 is supported and arranged between one of the bottom plates 111 and the protective baffle 40. The second support column 60 is supported and arranged between the other bottom plate 111 and the protective baffle 40. The vents a6 on the two bottom plates 111 are opposite to the protective baffle 40 so that the high-pressure gas discharged from each vent a6 is sprayed onto the protective baffle 40. In this way, when any battery cell 122 in the battery module 10 has thermal runaway, the high-pressure gas generated is sprayed onto the protective baffle 40 from the vent a6 on the bottom plate 111, thereby avoiding the high-pressure gas from being directly sprayed onto the bottom plate 111 of the other battery module 10, that is, the protective baffle 40 plays a role in protecting the bottom plate 111. Optionally, the protective baffle 40 can be made of mica board, ceramic board, fireproof plastic board or other heat-resistant insulating material.

[0055] It should be noted that in order to make the air holes a6 on the two bottom plates 111 opposite to the protective baffle 40, the protective baffle 40 is located between the first areas a1 of the two bottom plates 111, ensuring that the high-pressure gas discharged from the air holes a6 located in the first area a1 of the bottom plates 111 is sprayed onto the protective baffle 40.

[0056] Since there is no protective partition 40 between the second areas a2 of the two bottom plates 111, the flow paths of the second areas a2 of the two bottom plates 111 are interconnected. In this way, the high-pressure gas in the recessed space a4 of any bottom plate 111 can enter the space enclosed by the airflow grooves a3 of the two bottom plates 111, and then reach the explosion-proof valves 14 of the two battery modules 10. When the air pressure at the explosion-proof valves 14 of the two battery modules 10 reaches the preset pressure, the two explosion-proof valves 14 release the pressure. In other words, the airflow grooves a3 on the two bottom plates 111 can serve as a larger channel for high-pressure gas to pass through, which increases the capacity to accommodate high-pressure gas, enhances the heat dissipation effect, and is conducive to reducing the temperature of the gas reaching the explosion-proof valves 14 of the two battery modules 10.

[0057] In the embodiment of the present application, the base plates 111 of the two battery modules 10 are provided with wiring harness holes a5 that penetrate the base plates 111. The wiring harness holes a5 are located in an area outside the first area a1 and the second area a2, and the wiring harness holes a5 on the two base plates 111 are opposite to each other along the Z direction, so that the wiring harness holes a5 on the two base plates 111 are connected to each other. The wiring harness holes a5 on the two base plates 111 are used to pass the wiring harnesses that are connected to the battery cells 12 in the two battery boxes 11. The sealing ring 20 is arranged around the two wiring harness holes a5, so as to seal the two wiring harness holes a5 to prevent the high-pressure gas in the recessed space a4 and the airflow groove a3 from entering the electric control cavity a8 through the wiring harness holes a5. In this way, the wiring harness holes a5 on the base plate 111 are used to pass the wiring harnesses that are connected to the battery cells 12, so that the battery cells 12 of the two battery modules 10 are connected in series or in parallel by using the wiring harnesses.

[0058] Furthermore, an electrical connection terminal for connecting to an external charging or discharging circuit is installed on the battery box 11 of one of the battery modules 10, and the electrical connection terminal is electrically connected to the above-mentioned wiring harness, so that the battery cells 12 of the two battery modules 10 are electrically connected to the external charging or discharging circuit through the wiring harness and the electrical connection terminal in turn, thereby realizing the output or input of electrical energy (i.e., discharge or charge) of the double-layer battery. It can be understood that the electrical connection terminal is set to two, and the two electrical connection terminals are respectively a positive terminal and a negative terminal.

[0059] Based on the above double-layer battery, the present application also provides an electric device. The electric device includes a double-layer battery as described in any of the above embodiments, and the electric device uses the double-layer battery as a power source. Specifically, the electric device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc.; the electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electric devices.

[0060] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A battery module, characterized in that: include: A battery box (11) having a receiving cavity and a bottom plate (111) serving as a side wall of the battery box (11); A battery unit (12), comprising a first bracket (121), a plurality of battery cells (122) and a plurality of protective sheets (124), all of which are located in the receiving cavity; the first bracket (121) is arranged on one side of the bottom plate (111); each of the battery cells (122) is arranged on a side of the first bracket (121) away from the bottom plate (111) along the Z direction; the first bracket (121) is provided with a plurality of through holes (1211) corresponding to each of the battery cells (122); a protective sheet (124) is arranged between each of the battery cells (122) and the corresponding through hole (1211); each of the protective sheets (124) has a first thinned area (1241) capable of being ruptured under the action of high-pressure gas; and a protective plate (13) disposed between the first bracket (121) and the bottom plate (111), the protective plate (13) having a second thinned area (131) capable of being ruptured under the action of high-pressure gas, the first thinned area (1241) and the second thinned area (131) being arranged offset in the Z direction, and the bottom plate (111) having a vent hole (a6) opposite to the second thinned area (131); and The explosion-proof valve (14) is installed on the battery box (11), and the bottom plate (111) has an air flow channel connecting the vent hole (a6) and the explosion-proof valve (14).

2. The battery module according to claim 1, characterized in that: The first bracket (121) has a plurality of positioning grooves (1212) on one side facing away from the bottom plate (111) and connected to the plurality of through holes (1211) in a one-to-one correspondence; one end of each battery cell (122) along the Z direction is respectively installed in each positioning groove (1212); each protective sheet (124) is located in the positioning groove (1212) and is arranged between the corresponding battery cell (122) and the through hole (1211).

3. The battery module according to claim 1, characterized in that: The thickness of each of the first thinned regions (1241) is greater than the thickness of the second thinned regions (131).

4. The battery module according to claim 1, characterized in that: The bottom plate (111) comprises a first area (a1) and a second area (a2) arranged along the X direction, the protective plate (13) is arranged on a side of the first area (a1) facing the receiving cavity, a side surface of the first area (a1) away from the receiving cavity is recessed toward the protective plate (13) to form a recessed space (a4), and the vent hole (a6) is provided in the first area (a1) of the bottom plate (111); a side surface of the second area (a2) away from the receiving cavity is provided with an air flow groove (a3), the air flow groove (a3) ​​is connected to the explosion-proof valve (14) and the recessed space (a4), and the air flow groove (a3) ​​and the recessed space (a4) form the air flow channel.

5. The battery module according to claim 4, characterized in that: The battery module (10) further comprises a partition plate (114) arranged in the receiving cavity, wherein the partition plate (114) is arranged between the first area (a1) and the second area (a2) of the bottom plate (111) along the Z direction so as to separate the receiving cavity into a battery cavity (a9) located on the side of the partition plate (114) facing the first area (a1) and an electric control cavity (a8) located on the side of the partition plate (114) facing the second area (a2), wherein the battery cavity (a9) is used to receive the battery unit (12), and the electric control cavity (a8) is used to receive electrical components.

6. The battery module according to claim 5, characterized in that: A surface of the second region (a2) facing the electric control cavity (a8) is protruded into the electric control cavity (a8) relative to the first region (a1), and a depth of the air flow groove (a3) ​​is greater than a depth of the recessed space (a4).

7. The battery module according to claim 6, characterized in that: The battery box (11) comprises a top plate (112) and a plurality of side plates (113), the top plate (112) and the bottom plate (111) being arranged opposite to each other, each of the side plates (113) being connected between the top plate (112) and the bottom plate (111), and together with the bottom plate (111) and the top plate (112) enclosing the receiving cavity; The explosion-proof valve (14) is arranged on one of the side plates (113), and a ventilation cavity (a7) is provided in the side plate (113) on which the explosion-proof valve (14) is arranged, and the ventilation cavity (a7) is communicated with the air flow groove (a3) ​​and the explosion-proof valve (14).

8. A double-layer battery, characterized in that: It comprises a sealing ring (20) and two battery modules (10) according to any one of claims 1 to 7, wherein the two battery modules (10) are arranged opposite to each other and fixedly connected along the Z direction, and the base plates (111) of the two battery modules (10) are opposite to each other, and the air flow channels are provided on the sides of the two base plates (111) facing each other, and the sealing ring (20) is arranged between the base plates (111) of the two battery modules (10) for sealing the air flow channels on the two base plates (111).

9. The double-layer battery according to claim 8, characterized in that: The ventilation holes (a6) on one of the bottom plates (111) are arranged in a staggered manner with the ventilation holes (a6) on another adjacent bottom plate (111).

10. The double-layer battery according to claim 8, characterized in that: The double-layer battery further comprises a protective baffle (40), a first support column (50) and a second support column (60), wherein the protective baffle (40) is located between the two bottom plates (111), the first support column (50) is supported between one of the bottom plates (111) and the protective baffle (40), and the second support column (60) is supported between another adjacent bottom plate (111) and the protective baffle (40); The ventilation holes (a6) on the two bottom plates (111) are opposite to the protective baffle (40), so that the high-pressure gas discharged from each ventilation hole (a6) is sprayed onto the protective baffle (40).

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