A double-layer battery and an electric device

Abstract

The application relates to a double-layer battery and an electric device. The double-layer battery comprises a first battery module, a second battery module and a sealing ring. The first battery module comprises a first battery box, a first explosion-proof valve and a first battery module group. The first explosion-proof valve is arranged on the first battery box. The first battery box has a first bottom plate. The side of the first bottom plate, which is away from the first battery module group, has a first air flow groove which is connected with the inside of the first battery box and the first explosion-proof valve. The second battery module comprises a second battery box, a second explosion-proof valve and a second battery module group. The second explosion-proof valve is arranged on the second battery box. The second battery box has a second bottom plate. The side of the second bottom plate, which is away from the second battery module group, has a second air flow groove which is connected with the inside of the second battery box and the second explosion-proof valve. The first battery box and the second battery box are fixedly connected. The first bottom plate and the second bottom plate are opposite to each other. The sealing ring is arranged between the first bottom plate and the second bottom plate and is used for sealing the first air flow groove and the second air flow groove.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a double-layer battery and electrical device. Background Technology

[0002] With the development of new energy vehicle technology, more battery capacity needs to be allocated within the limited space of the vehicle to further improve vehicle range. To meet current power requirements, batteries typically require a double-layer design, meaning one battery contains two battery modules. However, the support mechanisms used to support and fix the double-layer battery modules in traditional double-layer batteries are complex, inconvenient to assemble, and pose a risk of stress on the cell terminals, which could lead to welding failures in the current collectors inside the cells. Summary of the Invention

[0003] Therefore, it is necessary to provide a double-layer battery and electrical device that improves upon the above-mentioned defects, addressing the problems that the support mechanism used to support and fix the double-layer battery module in the existing double-layer battery technology is relatively complex, inconvenient to assemble, and poses a risk of stress on the cell terminals, which may lead to welding failure of the current collector inside the cell.

[0004] On one hand, this application provides a double-layer battery, comprising:

[0005] The first battery module includes a first battery box, a first explosion-proof valve, and a first battery module disposed inside the first battery box. The first explosion-proof valve is disposed on the first battery box. The first battery box has a first bottom plate that serves as a side wall of the first battery box. The side of the first bottom plate opposite to the first battery module has a first airflow groove that connects the interior of the first battery box with the first explosion-proof valve.

[0006] The second battery module includes a second battery box, a second explosion-proof valve, and a second battery module disposed within the second battery box. The second explosion-proof valve is disposed on the second battery box. The second battery box has a second bottom plate serving as a side wall of the second battery box. The side of the second bottom plate opposite to the second battery module has a second airflow channel communicating between the interior of the second battery box and the second explosion-proof valve. The first battery box and the second battery box are fixedly connected, and the first bottom plate and the second bottom plate are opposite to each other.

[0007] A sealing ring is disposed between the first base plate and the second base plate to seal the first airflow groove and the second airflow groove.

[0008] In one embodiment, the first base plate includes a first mounting area and a first flow channel area. The surface of the first mounting area facing the second base plate is recessed in a direction away from the second base plate to form a first recessed space. The first mounting area has a first through hole that connects the first recessed space with the interior of the first battery box. The first battery module is disposed in the first mounting area. The first airflow groove is formed in the first flow channel area and communicates with the first recessed space. The sealing ring is arranged around the first mounting area and the first flow channel area.

[0009] In one embodiment, the first battery module includes a first support frame, a plurality of first battery cells and a second support frame. The first support frame is installed in the first mounting area of ​​the first base plate. Each of the first battery cells is disposed on the side of the first support frame away from the first base plate. The second support frame is disposed at the end of each of the first battery cells away from the first support frame and is fixedly connected to the first support frame.

[0010] The first support frame has a first vent hole corresponding to each of the first battery cells, so that the high-pressure gas ejected by the first battery cell during thermal runaway can enter the first recessed space through the corresponding first vent hole and the first through hole.

[0011] In one embodiment, the first battery module further includes a first protective plate disposed between the first base plate and the first support frame. The first protective plate has a plurality of first weak areas, each of which can rupture under the action of high-pressure gas.

[0012] In one embodiment, the first support frame has a plurality of first positioning grooves on the side opposite to the first base plate, one end of each of the first battery cells is respectively disposed in each of the first positioning grooves, and each of the first vent holes is respectively located in each of the first positioning grooves.

[0013] The first battery module also includes a plurality of first protective sheets disposed in each of the first positioning slots. Each first protective sheet is located between the corresponding first battery cell and the first vent hole. Each first protective sheet has a second weak area, which can be ruptured under the action of high pressure gas.

[0014] In one embodiment, the second base plate includes a second mounting area and a second flow channel area. The surface of the second mounting area facing the first base plate is recessed in a direction away from the first base plate to form a second recessed space. The second mounting area has a second through hole that connects the second recessed space with the interior of the second battery box. The second battery module is mounted in the second mounting area. The second airflow groove is formed in the second flow channel area and communicates with the second recessed space. The sealing ring is arranged around the second mounting area and the second flow channel area.

[0015] In one embodiment, a first wiring harness hole is formed through the first base plate, and the first wiring harness hole is located in a region outside the first mounting area and the first flow channel area; a second wiring harness hole is formed through the second base plate, and the second wiring harness hole is located in a region outside the second mounting area and the second flow channel area, and communicates with the first wiring harness hole. The first wiring harness hole and the second wiring harness hole are used for the wiring harnesses that supply power to the first battery module and the second battery module to pass through.

[0016] The sealing ring is arranged around the first wire harness hole and the second wire harness hole.

[0017] In one embodiment, the double-layer battery further includes a first support column, a second support column, and an isolation plate. The first support column is disposed on the outside of the first base plate and located in the first mounting area. The second support column is disposed on the outside of the second base plate and located in the second mounting area. The isolation plate is disposed between each of the first support columns and each of the second support columns to separate the first recessed space from the second recessed space.

[0018] In one embodiment, the second battery module includes a third support frame, a plurality of second battery cells and a fourth support frame. The third support frame is installed in the second mounting area of ​​the second base plate. Each second battery cell is disposed on the side of the third support frame away from the second base plate. The fourth support frame is disposed at the end of each second battery cell away from the third support frame and is fixedly connected to the third support frame.

[0019] The third support frame has a second vent hole corresponding to each of the second battery cells, so that the high-pressure gas ejected when the second battery cell thermally runs away can enter the second recessed space through the corresponding second vent hole and the second through hole; the second battery module also includes a second protective plate disposed between the second base plate and the third support frame, the second protective plate having a plurality of third weak areas, each of which can rupture under the action of high-pressure gas.

[0020] On the other hand, this application also provides an electrical device including a double-layer battery as described in any of the above embodiments.

[0021] Compared with the prior art, this application has the following beneficial effects:

[0022] In the aforementioned dual-layer battery and electrical equipment, the first and second battery modules are assembled separately during the production process. The first battery module is then stacked on top of the second battery module, with a sealing ring placed between them. Finally, the first battery box of the first battery module and the second battery box of the second battery module are locked and fixed together. This achieves the assembly of the first battery module, the sealing ring, and the second battery module, while simultaneously sealing the first airflow groove on the first base plate and the second airflow groove on the second base plate using the sealing ring. Compared to existing solutions that share a support mechanism, the dual-layer battery structure in this application is simpler, greatly simplifying the assembly process and reducing assembly difficulty, thus improving assembly efficiency. Furthermore, when locking the first and second battery modules, the locking force acts on the first and second battery boxes and is not transmitted to the first battery module inside the first battery box or the second battery module inside the second battery box. This avoids the failure of the current collector welding inside the battery module due to stress on the battery cell terminals. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a double-layer battery in one embodiment of the present invention;

[0024] Figure 2 for Figure 1 The diagram shows the exploded structure of a double-layer battery.

[0025] Figure 3 for Figure 1 The diagram shows the exploded structure of the double-layer battery from another perspective.

[0026] Figure 4 for Figure 1 A cross-sectional view of the double-layer battery shown;

[0027] Figure 5 for Figure 1 A schematic diagram of the structure of the first battery module of the double-layer battery shown;

[0028] Figure 6 for Figure 5 A schematic diagram of the first battery module shown from another perspective;

[0029] Figure 7 for Figure 5 The diagram shows the structure of the first battery module from another perspective (the first protective plate is omitted);

[0030] Figure 8 for Figure 1 A schematic diagram of the structure of the second battery module of the double-layer battery shown;

[0031] Figure 9 for Figure 8 The diagram shows the structure of the second battery module from another perspective;

[0032] Figure 10 for Figure 8 The diagram shows the structure of the second battery module from another perspective (the second protective plate is omitted). Detailed Implementation

[0033] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0034] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0036] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0038] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0039] Please see Figures 1 to 3 One embodiment of the present invention provides a dual-layer battery, including a first battery module 10, a second battery module 20, and a sealing ring 30.

[0040] The first battery module 10 includes a first battery box 11, a first explosion-proof valve 12, and a first battery module 13 (see...). Figure 4 A first battery module 13 is disposed inside a first battery box 11, and a first explosion-proof valve 12 is disposed on the first battery box 11. The first battery box 11 has a first bottom plate 111 serving as one side wall of the first battery box 11. The side of the first bottom plate 111 opposite to the first battery module 13 has a first airflow groove a3 communicating with the interior of the first battery box 11 and the first explosion-proof valve 12. Thus, when the first battery module 13 experiences thermal runaway, the generated high-pressure gas reaches the first explosion-proof valve 12 through the first airflow groove a3. When the pressure on the first explosion-proof valve 12 reaches a preset pressure, the first explosion-proof valve 12 opens to release pressure.

[0041] The second battery module 20 includes a second battery box 21, a second explosion-proof valve 22, and a second battery module 23 (see...). Figure 4 A second battery module 23 is disposed inside a second battery box 21, and a second explosion-proof valve 22 is disposed on the second battery box 21. The second battery box 21 has a second base plate 211 serving as one side wall of the second battery box 21. The side of the second base plate 211 facing away from the second battery module 23 has a second airflow groove b3 communicating with the interior of the second battery box 21 and the second explosion-proof valve 22. A first battery box 11 is stacked on the second battery box 21, and the first battery box 11 and the second battery box 21 are fixedly connected, with the side of the first battery box 11 having the first base plate 111 and the side of the second battery box 21 having the second base plate 211 facing each other. A sealing ring 30 is disposed between the first base plate 111 and the second base plate 211 to seal the first airflow groove a3 on the first base plate 111 and the second airflow groove b3 on the second base plate 211, ensuring that the airflow in the first airflow groove a3 and the second airflow groove b3 does not leak from the gap between the first base plate 111 and the second base plate 211. Optionally, the first battery box 11 and the second battery box 21 can be fixed together by bolts. Of course, in other embodiments, the first battery box 11 and the second battery box 21 can also be fixed by other methods, which are not specifically limited here.

[0042] Thus, in the production process of the double-layer battery of this application, the first battery module 10 and the second battery module 20 are first assembled separately, then the first battery module 10 is stacked on the second battery module 20, and a sealing ring 30 is set between the two. Finally, the first battery box 11 of the first battery module 10 and the second battery box 21 of the second battery module 20 are locked and fixed. On the one hand, the assembly of the first battery module 10, the sealing ring 30 and the second battery module 20 is realized, and on the other hand, the sealing ring 30 is used to seal the first airflow groove a3 on the first base plate 111 and the second airflow groove b3 on the second base plate 211. Compared with the existing technology that uses a shared support mechanism, the double-layer battery structure in this application is simple, greatly simplifying the assembly process and reducing assembly difficulty, which in turn helps to improve assembly efficiency. Furthermore, when used to lock and fix the first battery module 10 and the second battery module 20, the locking force acts on the first battery box 11 and the second battery box 21, and will not be transmitted to the first battery module 13 inside the first battery box 11 and the second battery module 23 inside the second battery box 21, thereby avoiding the failure of the current collector welding inside the battery module due to the force on the battery cell terminals.

[0043] Please see Figures 2 to 4In the embodiments of this application, the first base plate 111 includes a first mounting area a1 and a first flow channel area a2. The surface of the first mounting area a1 facing the second base plate 211 is recessed in a direction away from the second base plate 211 to form a first recessed space a4. The first mounting area a1 of the first base plate 111 has a first through hole a6 communicating with the first recessed space a4 and the interior of the first battery box 11. The first battery module 13 is disposed inside the first battery box 11 and located in the first mounting area a1 of the first base plate 111. A first airflow groove a3 is formed on the side of the first base plate 111 facing the second base plate 211, located in the first flow channel area a2 of the first base plate 111, and communicates with the first recessed space a4. A sealing ring 30 is arranged around the first mounting area a1 and the first flow channel area a2 of the first base plate 111, thereby sealing the first recessed space a4 in the first mounting area a1 and the first airflow groove a3 in the first flow channel area a2 of the first base plate 111. Thus, when the first battery module 13 experiences thermal runaway, the high-pressure gas generated reaches the first recessed space a4 through the first through hole a6, then enters the first airflow channel a3 from the first recessed space a4, and then reaches the first explosion-proof valve 12 from the first airflow channel a3. This helps to extend the gas flow path as much as possible, enhance the heat dissipation effect, and reduce the gas temperature at the first explosion-proof valve 12.

[0044] Please see Figures 4 to 7 As shown in the embodiment, the first battery module 13 includes a first support frame 131, a plurality of first battery cells 132, and a second support frame 133. The first support frame 131 is installed in the first mounting area a1 of the first base plate 111, and each first battery cell 132 is disposed on the side of the first support frame 131 facing away from the first base plate 111. The second support frame 133 is disposed at the end of each first battery cell 132 facing away from the first support frame 131, and is fixedly connected to the first support frame 131 by means of screw locking, thereby fixing each first battery cell 132 between the first support frame 131 and the second support frame 133. The first support frame 131 has a first vent hole 1311 corresponding to each of the first battery cells 132, so that when the first battery cell 132 experiences thermal runaway, the high-pressure gas ejected through the corresponding first vent hole 1311 passes through the first support frame 131, then enters the first recessed space a4 through the first through hole a6 on the first base plate 111, and then reaches the first explosion-proof valve 12 through the first airflow groove a3.

[0045] Furthermore, the first battery module 13 also includes a first protective plate 134 disposed between the first base plate 111 and the first support frame 131. The first protective plate 134 has multiple first weak points 1341, each of which can rupture under the action of high-pressure gas. Thus, when the first battery cell 132 experiences thermal runaway, the high-pressure gas ejected passes through the corresponding first vent 1311, through the first support frame 131, and reaches the space between the first protective plate 134 and the first support frame 131. This causes the corresponding first weak point 1341 on the first protective plate 134 to rupture under the action of the high-pressure gas, allowing the high-pressure gas to enter the first recessed space a4 through the ruptured first weak point 1341 and the first through hole a6 on the first base plate 111. The first protective plate 134 prevents high-pressure gas from directly impacting the first base plate 111 of the first battery box 11, thereby protecting the first base plate 111 of the first battery box 11. Optionally, the first protective plate 134 may be made of mica board, ceramic board, fireproof plastic board or other heat-resistant and insulating materials.

[0046] It should be noted that, as one implementation, the first weak area 1341 on the first protective plate 134 can be formed by thinning, that is, the thickness of the first weak area 1341 is thinner than the thickness of other areas on the first protective plate 134, thereby making the strength of the first weak area 1341 lower, so that the first weak area 1341 can rupture under the impact of high-pressure gas. Of course, in other embodiments, the first weak area 1341 can also be formed by other methods such as scoring, as long as the strength of the first weak area 1341 is weakened so that it can rupture under the impact of high-pressure gas, and no special limitation is made here.

[0047] Specifically, in this embodiment, the first support frame 131 has multiple first positioning grooves 1312 on the side opposite to the first base plate 111. One end of each first battery cell 132 is respectively disposed in the first positioning groove 1312, thereby positioning each first battery cell 132 using the first positioning groove 1312. Each first vent hole 1311 is located in the first positioning groove 1312. The first battery module 13 also includes multiple first protective plates 135 correspondingly disposed in each first positioning groove 1312. Each first protective plate 135 is located between the corresponding first battery cell 132 and the first vent hole 1311, and each first protective plate 135 has a second weak area 1351. The second weak area 1351 can rupture under the action of high-pressure gas. Thus, when any of the first battery cells 132 experiences thermal runaway, the resulting high-pressure gas directly breaks through the second weak area 1351 on the corresponding first protective sheet 135. The high-pressure gas then passes through the corresponding first vent 1311 to reach the space between the first protective plate 134 and the first support frame 131. The high-pressure gas then breaks through the corresponding first weak area 1341 on the first protective plate 134 and passes through the first through hole a6 to reach the first recessed space a4. Optionally, the first protective sheet 135 can be made of mica sheet, ceramic sheet, fire-retardant plastic sheet, or other heat-resistant and insulating materials.

[0048] It should be noted that the space between the first protective plate 134 and the first support frame 131 is larger than the space within the first vent 1311, thus providing better containment of high-pressure gas. After the high-pressure gas breaks through the second weak area 1351 on the first protective plate 135 and enters the space between the first protective plate 134 and the first support frame 131 through the first vent 1311, the impact force of the high-pressure gas decreases rapidly. This prevents the high-pressure gas from breaking through the second weak areas 1351 on other first protective plates 135 and causing impact and thermal effects on other first battery cells 132 that have not experienced thermal runaway. In other words, other first battery cells 132 that have not experienced thermal runaway are less likely to be impacted and thermally affected by high-pressure gas, greatly improving the overall safety performance of the double-layer battery.

[0049] In a specific embodiment, the first battery box 11 further includes a plurality of first side plates 113 (see Figure 4 ) and the first cover plate 112 (see Figure 4 The first cover plate 112 is disposed opposite to the first base plate 111, and multiple first side plates 113 are connected between the first cover plate 112 and the first base plate 111, and are connected end to end, so that the first cover plate 112, the first base plate 111 and each of the first side plates 113 together enclose an inner cavity for accommodating the first battery module 13. The aforementioned first explosion-proof valve 12 is installed on one of the first side plates 113.

[0050] Furthermore, the first side plate 113 on which the first explosion-proof valve 12 is installed has a first connecting channel a7, which is used to connect the first explosion-proof valve 12 with the first airflow groove a3 on the first base plate 111. Optionally, the first side plate 113 on which the first explosion-proof valve 12 is installed is a profile plate, and the cavity in the profile plate serves as the first connecting channel a7.

[0051] Please participate Figures 2 to 4 In the embodiments of this application, the second base plate 211 includes a second mounting area b1 and a second flow channel area b2. The surface of the second mounting area b1 facing the first base plate 111 is recessed in a direction away from the first base plate 111 to form a second recessed space b4. The second mounting area b1 has a second through hole b6 connecting the second recessed space b4 to the interior of the second battery box 21. The second battery module 23 is disposed inside the second battery box 21 and located in the second mounting area b1 of the second base plate 211. A second airflow groove b3 is formed on the side of the second base plate 211 facing the first base plate 111, located in the second flow channel area b2 of the second base plate 211, and communicates with the second recessed space b4. A sealing ring 30 is arranged around the second mounting area b1 and the second flow channel area b2 of the second base plate 211, thereby sealing the second recessed space b4 located in the second mounting area b1 and the second airflow groove b3 located in the second flow channel area b2 of the second base plate 211. Thus, when the second battery module 23 experiences thermal runaway, the high-pressure gas generated reaches the second recessed space b4 through the second through hole b6, then enters the second airflow channel b3 from the second recessed space b4, and finally reaches the second explosion-proof valve 22 from the second airflow channel b3. This helps to extend the gas flow path as much as possible, enhance the heat dissipation effect, and reduce the gas temperature at the second explosion-proof valve 22.

[0052] Specifically, in this embodiment, a first wiring harness hole a5 is formed on the first base plate 111, penetrating the first base plate 111. This first wiring harness hole a5 is located outside the first mounting area a1 and the first flow channel area a2. A second wiring harness hole b5 is formed on the second base plate 211, penetrating the second base plate 211. This second wiring harness hole b5 is located outside the second mounting area b1 and the second flow channel area b2, and the first wiring harness hole a5 and the second wiring harness hole b5 are connected. The first wiring harness hole a5 and the second wiring harness hole b5 are used for the wiring harnesses connecting the first battery module 13 and the second battery module 23 to power the circuit. The aforementioned sealing ring 30 is arranged around the first wiring harness hole a5 and the second wiring harness hole b5 to seal the first wiring harness hole a5 and the second wiring harness hole b5, thereby preventing gas from entering the first recessed space a4, the second recessed area b4, the first airflow groove a3, and the second airflow groove b3. Thus, the wiring harnesses that supply power to the first battery module 13 and the second battery module 23 pass through the first wiring harness hole a5 and the second wiring harness hole b5, thereby enabling the first battery module 13 and the second battery module 23 to be connected in series or in parallel using the wiring harnesses.

[0053] Furthermore, the first battery box 11 or the second battery box 21 is equipped with an electrical connection terminal 40 for connecting to an external charging or discharging circuit. This electrical connection terminal 40 is electrically connected to the aforementioned wiring harness, so that the first battery module 13 and the second battery module 23 are sequentially electrically connected to the external charging or discharging circuit through the wiring harness and the electrical connection terminal 40, thereby realizing the output or input (i.e., discharging or charging) of electrical energy from the dual-layer battery. It can be understood that there are two electrical connection terminals 40, which are the positive terminal and the negative terminal, respectively.

[0054] Furthermore, the double-layer battery also includes a first support post 50, a second support post 60, and a separator plate 70. The first support post 50 is disposed on the outer side of the first base plate 111 and located in the first mounting area a1 of the first base plate 111. The second support post 60 is disposed on the outer side of the second base plate 211 and located in the second mounting area b1 of the first base plate 111. The separator plate 70 is disposed between each of the first support posts 50 and each of the second support posts 60 to separate the first recessed space a4 and the second recessed space b4. Thus, when any of the first battery cells 132 in the first battery module 13 experiences thermal runaway, the high-pressure gas generated is ejected from the first through hole a6 on the first base plate 111 onto the separator plate 70, thereby preventing the high-pressure gas from being directly ejected onto the second base plate 211. In other words, the separator plate 70 serves to protect the second base plate 211. Similarly, when any of the second battery cells 232232 in the second battery module 23 experiences thermal runaway, the high-pressure gas generated is ejected from the second through hole b6 on the second base plate 211 onto the isolation plate 70, thereby preventing the high-pressure gas from directly spraying onto the first base plate 111. The isolation plate 70 serves to protect the first base plate 111. Optionally, the isolation plate 70 can be made of mica board, ceramic board, fireproof plastic board, or other heat-resistant and insulating materials.

[0055] Specifically, in this embodiment, since no isolation plate 70 is provided between the first flow channel region a2 of the first base plate 111 and the second flow channel region b2 of the second base plate 211, the first airflow groove a3 located in the first flow channel region a2 and the second airflow groove b3 located in the second flow channel region b2 are interconnected. Thus, the high-pressure gas in the first recessed space a4 can enter the first airflow groove a3 and the second airflow groove b3, and then reach the first explosion-proof valve 12 and the second explosion-proof valve 22. When the gas pressure at the first explosion-proof valve 12 and the second explosion-proof valve 22 reaches a preset pressure, the first explosion-proof valve 12 and the second explosion-proof valve 22 release pressure. Similarly, the high-pressure gas in the second recessed space b4 can also enter the first airflow groove a3 and the second airflow groove b3, and reach the first explosion-proof valve 12 and the second explosion-proof valve 22. When the gas pressure at the first explosion-proof valve 12 and the second explosion-proof valve 22 reaches a preset pressure, the first explosion-proof valve 12 and the second explosion-proof valve 22 release pressure. In other words, the first airflow channel a3 and the second airflow channel b3 can serve as a large channel for high-pressure gas to pass through, increasing the capacity to hold high-pressure gas, enhancing the heat dissipation effect, and helping to reduce the gas temperature reaching the first explosion-proof valve 12 and the second explosion-proof valve 22.

[0056] Please see Figure 4Specifically, in this embodiment, the first battery module 10 further includes a first partition plate 114 disposed within the first battery box 11. The first partition plate 114 is located between the first mounting area a1 and the first flow channel area a2 of the first base plate 111, dividing the inner cavity of the first battery box 11 into a first battery cavity a9 and a first electronic control cavity a8. The first battery cavity a9 is located on the side of the first partition plate 114 facing the first mounting area a1, and the first battery module 13 is housed within the first battery cavity a9. The first electronic control cavity a8 is located on the side of the first partition plate 114 facing the first flow channel area a2, and the first electronic control cavity a8 is used to house electrical components, such as a battery management system, a relay, etc.

[0057] Furthermore, the bottom wall of the first airflow channel a3 protrudes into the first electrical control cavity a8 to increase the depth of the first airflow channel a3. This provides a sufficiently large space for high-pressure gas to pass through, increasing its capacity to hold high-pressure gas, enhancing heat dissipation, and helping to reduce the gas temperature reaching the first explosion-proof valve 12 and the second explosion-proof valve 22. It should be noted that since there is extra space in the first electrical control cavity a8 used to house electrical components, the protrusion of the bottom wall of the first airflow channel a3 into the first electrical control cavity a8 occupies space within the first electrical control cavity a8, thereby increasing the space within the first airflow channel a3. This effectively converts the extra space in the first electrical control cavity a8 into space within the first airflow channel a3, avoiding the need to increase the thickness of the first base plate 111, and thus avoiding an increase in the height of the double-layer battery.

[0058] In a specific embodiment, the second battery module 20 further includes a second partition plate 214 disposed within the second battery box 21. The second partition plate 214 is located between the second mounting area b1 and the second flow channel area b2 of the second base plate 211, dividing the inner cavity of the second battery box 21 into a second battery cavity b9 and a second electronic control cavity b8. The second battery cavity b9 is located on the side of the second partition plate 214 facing the second mounting area b1, and the second battery module 23 is housed within this second battery cavity b9. The second electronic control cavity b8 is located on the side of the second partition plate 214 facing the second flow channel area b2, and is used to house electrical components, such as a battery management system and a relay.

[0059] Furthermore, the bottom wall of the second airflow channel b3 protrudes into the second electrical control cavity b8 to increase its depth. This provides sufficient space for high-pressure gas to pass through, increasing its capacity to hold the gas, enhancing heat dissipation, and helping to reduce the gas temperature reaching the first explosion-proof valve 12 and the second explosion-proof valve 22. It should be noted that since there is extra space in the second electrical control cavity b8 used to house electrical components, the protrusion of the bottom wall of the second airflow channel b3 into the cavity occupies space within the cavity, thus increasing the space within the channel. This converts the extra space in the cavity into space within the channel, avoiding the need to increase the thickness of the second base plate 211 and consequently preventing an increase in the height of the double-layer battery.

[0060] Please see Figure 4 , Figures 8 to 10 Specifically, in this embodiment, the second battery module 23 includes a third support frame 231, multiple second battery cells 232, and a fourth support frame 233. The third support frame 231 is installed in the second mounting area b1 of the second base plate 211, and each second battery cell 232 is disposed on the side of the third support frame 231 facing away from the second base plate 211. The fourth support frame 233 is disposed at the end of each second battery cell 232 facing away from the third support frame 231, and is fixedly connected to the third support frame 231 by means of screw locking, thereby fixing each second battery cell 232 between the third support frame 231 and the fourth support frame 233. The third support frame 231 has a second vent hole 2311 corresponding to each of the second battery cells 232, so that when the second battery cell 232 experiences thermal runaway, the high-pressure gas ejected through the corresponding second vent hole 2311 passes through the third support frame 231, then enters the second recessed space b4 through the second through hole b6 on the second base plate 211, and then reaches the second explosion-proof valve 22 through the second airflow channel b3.

[0061] Furthermore, the second battery module 23 also includes a second protective plate 234 disposed between the second base plate 211 and the third support frame 231. This second protective plate 234 has multiple third weak points 2341, each of which can rupture under the action of high-pressure gas. Thus, when the second battery cell 232 experiences thermal runaway, the high-pressure gas ejected passes through the corresponding second vent 2311, through the third support frame 231, and reaches the space between the second protective plate 234 and the third support frame 231. This causes the corresponding third weak point 2341 on the second protective plate 234 to rupture under the action of the high-pressure gas, allowing the high-pressure gas to enter the second recessed space b4 through the ruptured third weak point 2341 and the second through hole b6 on the second base plate 211. The second protective plate 234 prevents high-pressure gas from directly impacting the second base plate 211 of the second battery box 21, thereby protecting the second base plate 211 of the second battery box 21. Alternatively, the second protective plate 234 may be made of mica board, ceramic board, fireproof plastic board or other heat-resistant and insulating materials.

[0062] It should be noted that, as one implementation, the third weak area 2341 on the second protective plate 234 can be formed by thinning, that is, the thickness of the third weak area 2341 is thinner than the thickness of other areas on the second protective plate 234, thereby making the strength of the third weak area 2341 lower, so that the third weak area 2341 can rupture under the impact of high-pressure gas. Of course, in other embodiments, the third weak area 2341 can also be formed by other methods such as scoring, as long as the strength of the third weak area 2341 is weakened so that it can rupture under the impact of high-pressure gas, and no special limitation is made here.

[0063] Specifically, in this embodiment, the third support frame 231 has multiple second positioning grooves 2312 on the side opposite to the second base plate 211. One end of each second battery cell 232 is respectively disposed in the second positioning groove 2312, thereby positioning each second battery cell 232 using the second positioning groove 2312. Each second vent hole 2311 is located in each second positioning groove 2312. The second battery module 23 also includes multiple second protective plates 235 correspondingly disposed in each second positioning groove 2312. Each second protective plate 235 is located between the corresponding second battery cell 232 and the second vent hole 2311, and each first protective plate 135 has a fourth weak area 2351. This fourth weak area 2351 can rupture under the action of high-pressure gas. Thus, when any of the second battery cells 232 experiences thermal runaway, the resulting high-pressure gas directly breaks through the fourth weak area 2351 on the corresponding second protective sheet 235. The high-pressure gas then passes through the corresponding second vent 2311 to reach the space between the second protective plate 234 and the third support frame 231. The high-pressure gas then breaks through the corresponding third weak area 2341 on the second protective plate 234 and passes through the second through hole b6 to reach the second recessed space b4. Optionally, the second protective sheet 235 can be made of mica sheet, ceramic sheet, fire-resistant plastic sheet, or other heat-resistant and insulating materials.

[0064] It should be noted that the space between the second protective plate 234 and the third support frame 231 is larger than the space within the second vent 2311, resulting in better containment of high-pressure gas. After the high-pressure gas breaks through the fourth weak zone 2351 on the second protective plate 235 and enters the space between the second protective plate 234 and the third support frame 231 through the second vent 2311, the impact force of the high-pressure gas rapidly decreases. This prevents the high-pressure gas from breaking through the fourth weak zone 2351 on other second protective plates 235 and causing impact and thermal effects on other second battery cells 232 that have not experienced thermal runaway. In other words, other second battery cells 232 that have not experienced thermal runaway are less likely to be impacted and thermally affected by high-pressure gas, greatly improving the overall safety performance of the double-layer battery.

[0065] In a specific embodiment, the second battery box 21 further includes multiple second side plates 213 and a second cover plate 212. The second cover plate 212 is disposed opposite to the second bottom plate 211, and the multiple second side plates 213 are connected between the second cover plate 212 and the second bottom plate 211, and are connected end to end, so that the second cover plate 212, the second bottom plate 211 and each of the second side plates 213 together enclose an inner cavity for accommodating the second battery module 23. The aforementioned second explosion-proof valve 22 is installed on one of the second side plates 213.

[0066] Furthermore, the second side plate 213, on which the second explosion-proof valve 22 is installed, has a second connecting channel b7, which connects the second explosion-proof valve 22 thereon with the second airflow groove b3 on the second base plate 211. Optionally, the second side plate 213 on which the second explosion-proof valve 22 is installed is made of profile plate, and the cavity in the profile plate serves as the second connecting channel b7.

[0067] Based on the aforementioned double-layer battery, the present invention also provides an electrical device. This electrical device includes the double-layer battery as described in any of the above embodiments, and utilizes the double-layer battery as a power source. Specifically, the electrical device can be a vehicle, mobile phone, portable device, laptop computer, ship, spacecraft, electric toy, and power tool, etc. Vehicles can be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc.; spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of this application do not impose special limitations on the aforementioned electrical devices.

[0068] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0069] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A double-layer battery, characterized in that, include: The first battery module (10) includes a first battery box (11), a first explosion-proof valve (12) and a first battery module (13) disposed in the first battery box (11). The first explosion-proof valve (12) is disposed on the first battery box (11). The first battery box (11) has a first bottom plate (111) that serves as a side wall of the first battery box (11). The side of the first bottom plate (111) facing away from the first battery module (13) has a first airflow groove (a3) ​​that connects the interior of the first battery box (11) with the first explosion-proof valve (12). The second battery module (20) includes a second battery box (21), a second explosion-proof valve (22), and a second battery module (23) disposed within the second battery box (21). The second explosion-proof valve (22) is disposed on the second battery box (21). The second battery box (21) has a second bottom plate (211) serving as a side wall of the second battery box (21). The side of the second bottom plate (211) facing away from the second battery module (23) has a second airflow groove (b3) connecting the interior of the second battery box (21) with the second explosion-proof valve (22). The first battery box (11) is fixedly connected to the second battery box (21), and the first bottom plate (111) and the second bottom plate (211) are opposite to each other. A sealing ring (30) is disposed between the first base plate (111) and the second base plate (211) for sealing the first airflow groove (a3) ​​and the second airflow groove (b3); The first base plate (111) includes a first mounting area (a1) and a first flow channel area (a2). The surface of the first mounting area (a1) facing the second base plate (211) is recessed in a direction away from the second base plate (211) to form a first recessed space (a4). The first mounting area (a1) has a first through hole (a6) connecting the first recessed space (a4) and the interior of the first battery box (11). The first battery module (13) is disposed in the first mounting area (a1). The first airflow groove (a3) ​​is opened in the first flow channel area (a2) and communicates with the first recessed space (a4). The sealing ring (30) is arranged around the first mounting area (a1) and the first flow channel area (a2). The second base plate (211) includes a second mounting area (b1) and a second flow channel area (b2). The second mounting area (b1) is recessed on one side of the surface facing the first base plate (111) in a direction away from the first base plate (111) to form a second recessed space (b4). The second mounting area (b1) has a second through hole (b6) that connects the second recessed space (b4) with the interior of the second battery box (21). The second battery module (23) is mounted in the second mounting area (b1). The second airflow groove (b3) is opened in the second flow channel area (b2) and communicates with the second recessed space (b4). The sealing ring (30) is arranged around the second mounting area (b1) and the second flow channel area (b2). The double-layer battery also includes a first support column (50), a second support column (60), and an isolation plate (70). The first support column (50) is disposed on the outside of the first base plate (111) and located in the first mounting area (a1). The second support column (60) is disposed on the outside of the second base plate (211) and located in the second mounting area (b1). The isolation plate (70) is disposed between each of the first support columns (50) and each of the second support columns (60) to separate the first recessed space (a4) and the second recessed space (b4).

2. The double-layer battery according to claim 1, characterized in that, The first battery module (13) includes a first support frame (131), a plurality of first battery cells (132) and a second support frame (133). The first support frame (131) is installed in the first mounting area (a1) of the first base plate (111). Each first battery cell (132) is located on the side of the first support frame (131) away from the first base plate (111). The second support frame (133) is located at the end of each first battery cell (132) away from the first support frame (131) and is fixedly connected to the first support frame (131). The first support frame (131) has a first vent hole (1311) corresponding to each of the first battery cells (132) so that the high-pressure gas ejected by the first battery cell (132) during thermal runaway can enter the first recessed space (a4) through the corresponding first vent hole (1311) and the first through hole (a6).

3. The double-layer battery according to claim 2, characterized in that, The first battery module (13) also includes a first protective plate (134) disposed between the first base plate (111) and the first support frame (131). The first protective plate (134) has multiple first weak areas (1341), and each first weak area (1341) can rupture under the action of high pressure gas.

4. The double-layer battery according to claim 2, characterized in that, The first support frame (131) has a plurality of first positioning grooves (1312) on the side away from the first base plate (111), one end of each of the first battery cells (132) is respectively disposed in each of the first positioning grooves (1312), and each of the first vent holes (1311) is respectively located in each of the first positioning grooves (1312). The first battery module (13) also includes a plurality of first protective plates (135) that are disposed in each of the first positioning slots (1312). Each first protective plate (135) is located between the corresponding first battery cell (132) and the first vent (1311). Each first protective plate (135) has a second weak area (1351) that can be broken under the action of high pressure gas.

5. The double-layer battery according to claim 1, characterized in that, The first base plate (111) has a first wire harness hole (a5) that penetrates the first base plate (111), and the first wire harness hole (a5) is located in the area outside the first mounting area (a1) and the first flow channel area (a2); the second base plate (211) has a second wire harness hole (b5) that penetrates the second base plate (211), and the second wire harness hole (b5) is located in the area outside the second mounting area (b1) and the second flow channel area (b2), and communicates with the first wire harness hole (a5). The first wire harness hole (a5) and the second wire harness hole (b5) are used for the wire harnesses that power the connection between the first battery module (13) and the second battery module (23) to pass through. The sealing ring (30) is arranged around the first wire harness hole (a5) and the second wire harness hole (b5).

6. The double-layer battery according to claim 1, characterized in that, The second battery module (23) includes a third support frame (231), a plurality of second battery cells (232) and a fourth support frame (233). The third support frame (231) is installed in the second mounting area (b1) of the second base plate (211). Each second battery cell (232) is located on the side of the third support frame (231) away from the second base plate (211). The fourth support frame (233) is located at the end of each second battery cell (232) away from the third support frame (231) and is fixedly connected to the third support frame (231). The third support frame (231) has a second vent (2311) corresponding to each of the second battery cells (232) so that the high-pressure gas ejected by the second battery cell (232) during thermal runaway can enter the second recessed space (b4) through the corresponding second vent (2311) and the second through hole (b6); the second battery module (23) also includes a second protective plate (234) disposed between the second base plate (211) and the third support frame (231), the second protective plate (234) has a plurality of third weak areas (2341), each of the third weak areas (2341) can rupture under the action of high-pressure gas.

7. An electrical device comprising a double-layer battery as described in any one of claims 1 to 6.

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