Double-layer battery and electric equipment

Abstract

The invention relates to a double-layer battery and electric equipment. The double-layer battery comprises a first battery module and a second battery module, the first battery module comprises a first battery box, a first anti-explosion valve and a first battery module, the first anti-explosion valve is arranged on the first battery box, the first battery box is provided with a first bottom plate, and one side, deviating from the first battery module, of the first bottom plate is provided with a first airflow groove communicated with the interior of the first battery box and the first anti-explosion valve; the second battery module comprises a second battery box, a second anti-explosion valve and a second battery module, the second anti-explosion valve is arranged on the second battery box, the second battery box is provided with a second bottom plate, and one side, deviating from the second battery module, of the second bottom plate is provided with a second airflow groove communicated with the interior of the second battery box and the second anti-explosion valve; the first battery box is fixedly connected with the second battery box, and the first bottom plate is opposite to the second bottom plate; and 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] The present invention relates to the technical field of batteries, in particular to a double-layer battery and electrical equipment. Background Art

[0002] With the development of new energy vehicle technology, in order to further improve vehicle endurance, more power needs to be configured in the limited space of the vehicle. 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, the support mechanism used to support and fix the double-layer battery module in the traditional double-layer battery is relatively complex, not easy to assemble, and there is a risk of stress on the battery cell pole, which in turn causes the risk of welding failure of the collector inside the battery cell. Summary of the invention

[0003] Based on this, it is necessary to provide a double-layer battery and electrical equipment that improves the above defects in order to address the problem that the supporting mechanism used to support and fix the double-layer battery module in the prior art is relatively complex, inconvenient to assemble, and there is a risk of stress on the battery cell poles, which in turn causes the risk of welding failure of the current collector inside the battery cell.

[0004] In one aspect, the present application provides a double-layer battery, comprising:

[0005] A first battery module comprises a first battery box, a first explosion-proof valve and a first battery module arranged in the first battery box, the first explosion-proof valve is arranged on the first battery box, the first battery box has a first bottom plate as a side wall of the first battery box, and a side of the first bottom plate facing away from the first battery module has a first air flow groove connecting the interior of the first battery box and the first explosion-proof valve;

[0006] a second battery module, comprising a second battery box, a second explosion-proof valve and a second battery module arranged in the second battery box, the second explosion-proof valve being arranged on the second battery box, the second battery box having a second bottom plate as a side wall of the second battery box, the second bottom plate having a second air flow groove connecting the interior of the second battery box with the second explosion-proof valve on a side away from the second battery module; the first battery box is fixedly connected to the second battery box, and the first bottom plate and the second bottom plate are opposite to each other; and

[0007] A 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.

[0008] In one embodiment, the first base plate includes a first installation area and a first flow channel area, and a surface of the first installation area on one side facing the second base plate is recessed in a direction away from the second base plate to form a first recessed space, and a first through hole connecting the first recessed space with the interior of the first battery box is opened in the first installation area, and the first battery module is arranged in the first installation area, and the first air flow groove is opened in the first flow channel area and connected with the first recessed space, and the sealing ring is arranged around the first installation 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 installation area of ​​the first bottom plate, each of the first battery cells is arranged on a side of the first support frame away from the first bottom plate, and the second support frame is arranged at an 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 first vent holes corresponding to the first battery cells one by one, so that the high-pressure gas ejected when the first battery cells are in thermal runaway can enter the first recessed space through the corresponding first vent holes and the first through holes.

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

[0012] In one embodiment, the first support frame has a plurality of first positioning grooves on a side facing away from the first bottom 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 arranged in correspondence with each of the first positioning grooves, each of the first protective sheets is located between the corresponding first battery cell and the first vent hole, and each of the first protective sheets 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 installation area and a second flow channel area, and a surface of the second installation area on one side facing the first base plate is recessed in a direction away from the first base plate to form a second recessed space, and a second through hole connecting the second recessed space with the interior of the second battery box is provided in the second installation area. The second battery module is installed in the second installation area, and the second air flow groove is provided in the second flow channel area and is connected to the second recessed space, and the sealing ring is arranged around the second installation area and the second flow channel area.

[0015] In one embodiment, a first harness hole penetrating the first bottom plate is provided on the first bottom plate, and the first harness hole is located in an area outside the first mounting area and the first flow channel area; a second harness hole penetrating the second bottom plate is provided on the second bottom plate, and the second harness hole is located in an area outside the second mounting area and the second flow channel area, and is communicated with the first harness hole, and the first harness hole and the second harness hole are used for passing a harness for supplying power to connect the first battery module and the second battery module;

[0016] The sealing ring is arranged around the first wiring harness hole and the second wiring 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 arranged on the outer side of the first bottom plate and is located in the first installation area, the second support column is arranged on the outer side of the second bottom plate and is located in the second installation area, and the isolation plate is arranged 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 mounted on the second mounting area of ​​the second bottom plate, each of the second battery cells is arranged on a side of the third support frame away from the second bottom plate, and the fourth support frame is arranged at an end of each of the second battery cells away from the third support frame and is fixedly connected to the third support frame;

[0019] The third support frame has second ventilation holes corresponding to each of the second battery cells one by one, so that the high-pressure gas ejected when the second battery cells thermally run away can enter the second recessed space through the corresponding second ventilation holes and the second through holes; the second battery module also includes a second protective plate arranged between the second bottom plate and the third support frame, and the second protective plate has multiple third weak areas, each of which can be ruptured under the action of high-pressure gas.

[0020] On the other hand, the present application also provides an electrical device, comprising 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 production process of the above-mentioned double-layer battery and electrical equipment, the first battery module and the second battery module are first assembled separately, and then the first battery module is stacked on the second battery module, and a sealing ring is arranged between the two. Finally, the first battery box of the first battery module and the second battery box of the second battery module are locked and fixed, so that on the one hand, the assembly of the first battery module, the sealing ring and the second battery module is realized, and on the other hand, the sealing ring is used to seal the first air flow groove on the first bottom plate and the second air flow groove on the second bottom plate. Compared with the solution of sharing a support mechanism in the prior art, the double-layer battery structure in the present application is simple, which greatly simplifies the assembly process and assembly difficulty, thereby helping to improve assembly efficiency, and when used to lock and fix the first battery module and the second battery module, the locking force acts on the first battery box and the second battery box, and will not be transmitted to the first battery module inside the first battery box and the second battery module inside the second battery box, thereby avoiding the failure of the collector welding inside the battery module due to the force on the battery cell pole of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[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 Schematic diagram of the exploded structure of the double-layer battery shown;

[0025] Figure 3 for Figure 1 The schematic diagram of the exploded structure of the double-layer battery shown in 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 structural diagram of a first battery module of a double-layer battery shown;

[0028] Figure 6 for Figure 5 A schematic structural diagram of the first battery module shown in another viewing angle;

[0029] Figure 7 for Figure 5 A schematic structural diagram of the first battery module shown in another viewing angle (the first protective plate is omitted);

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

[0031] Fig. 9 for Figure 8 A schematic structural diagram of the second battery module shown in another viewing angle;

[0032] Fig.10 for Figure 8 The structure schematic diagram of the second battery module shown in another viewing angle (the second protective plate is omitted). DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] See also Figures 1 to 3 An embodiment of the present invention provides a double-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 ). The first battery module 13 is arranged in the first battery box 11, and the first explosion-proof valve 12 is arranged on the first battery box 11. The first battery box 11 has a first bottom plate 111 as a side wall of the first battery box 11, and the side of the first bottom plate 111 away from the first battery module 13 has a first air flow groove a3 connecting the inside of the first battery box 11 and the first explosion-proof valve 12. In this way, when the first battery module 13 has a thermal runaway, the generated high-pressure gas reaches the first explosion-proof valve 12 through the first air flow groove a3, and when the pressure on the first explosion-proof valve 12 reaches the preset pressure, the first explosion-proof valve 12 opens to release the 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 ). The second battery module 23 is arranged in the second battery box 21, and the second explosion-proof valve 22 is arranged on the second battery box 21. The second battery box 21 has a second bottom plate 211 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 air flow groove b3 connecting the inside of the second battery box 21 and the second explosion-proof valve 22. The first battery box 11 is stacked on the second battery box 21, the first battery box 11 is fixedly connected to the second battery box 21, and the side of the first battery box 11 having the first bottom plate 111 and the side of the second battery box 21 having the second bottom plate 211 are opposite to each other. The sealing ring 30 is arranged between the first bottom plate 111 and the second bottom plate 211, and is used to seal the first air flow groove a3 on the first bottom plate 111 and the second air flow groove b3 on the second bottom plate 211, to ensure that the air flow in the first air flow groove a3 and the second air flow groove b3 will not leak from the gap between the first bottom plate 111 and the second bottom plate 211. Optionally, the first battery box 11 and the second battery box 21 can be fixed by bolts. Of course, in other embodiments, the first battery box 11 and the second battery box 21 can also be fixed by other fixing methods, which are not particularly limited here.

[0042] In this way, during the production process of the double-layer battery of the present application, the first battery module 10 and the second battery module 20 are first assembled separately, and 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 air flow groove a3 on the first bottom plate 111 and the second air flow groove b3 on the second bottom plate 211. Compared with the solution of sharing a support mechanism in the prior art, the double-layer battery structure in the present application is simple, which greatly simplifies the assembly process and assembly difficulty, thereby helping to improve assembly efficiency. 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 collector welding inside the battery module due to the force on the battery module's cell poles.

[0043] See also Figures 2 to 4In the embodiment of the present application, the first bottom plate 111 includes a first installation area a1 and a first flow channel area a2. The first installation area a1 is recessed on one side of the second bottom plate 211 in a direction away from the second bottom plate 211 to form a first recessed space a4. The first installation area a1 of the first bottom plate 111 is provided with a first through hole a6 connecting the first recessed space a4 with the interior of the first battery box 11. The first battery module 13 is arranged in the first battery box 11 and located at the first installation area a1 of the first bottom plate 111. The first air flow groove a3 is provided on one side of the first bottom plate 111 facing the second bottom plate 211 and located in the first flow channel area a2 of the first bottom plate 111, and is connected to the first recessed space a4. The sealing ring 30 is arranged around the first installation area a1 and the first flow channel area a2 of the first bottom plate 111, so as to seal the first recessed space a4 located in the first installation area a1 on the first bottom plate 111 and the first air flow groove a3 located in the first flow channel area a2. In this way, 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 air flow groove a3 from the first recessed space a4, and then reaches the first explosion-proof valve 12 from the first air flow groove a3, which is beneficial to extend the gas flow path as much as possible, enhance the heat dissipation effect, and reduce the gas temperature reaching the first explosion-proof valve 12.

[0044] See also Figures 4 to 7 As shown, specifically 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 installation area a1 of the first bottom plate 111, and each first battery cell 132 is arranged on the side of the first support frame 131 away from the first bottom plate 111. The second support frame 133 is arranged at one end of each first battery cell 132 away from the first support frame 131, and is fixedly connected to the first support frame 131 by screw locking, so that each first battery cell 132 is fixed between the first support frame 131 and the second support frame 133. The first support frame 131 has first vent holes 1311 corresponding to each first battery cell 132, so that the high-pressure gas ejected when the first battery cell 132 has thermal runaway passes through the corresponding first vent holes 1311 through the first support frame 131, then enters the first recessed space a4 through the first through hole a6 on the first bottom plate 111, and then reaches the first explosion-proof valve 12 through the first air flow groove a3.

[0045] Furthermore, the first battery module 13 also includes a first protective plate 134 disposed between the first bottom plate 111 and the first support frame 131. The first protective plate 134 has a plurality of first weak areas 1341, each of which can be broken under the action of high-pressure gas. In this way, when the first battery cell 132 has thermal runaway, the high-pressure gas ejected passes through the first support frame 131 through the corresponding first vent 1311 and reaches between the first protective plate 134 and the first support frame 131, so that the corresponding first weak area 1341 on the first protective plate 134 is broken under the action of high-pressure gas, and then the high-pressure gas enters the first recessed space a4 through the broken first weak area 1341 and the first through hole a6 on the first bottom plate 111. The provision of the first protective plate 134 prevents the high-pressure gas from directly impacting the first bottom plate 111 of the first battery box 11, thereby protecting the first bottom plate 111 of the first battery box 11. Optionally, the first protective plate 134 can be made of mica board, ceramic board, fireproof plastic board or other heat-resistant insulating material.

[0046] It should be noted that, as an 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, so that the strength of the first weak area 1341 is relatively low, and the first weak area 1341 can be broken 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 notching, as long as the strength of the first weak area 1341 can be weakened so that it can be broken under the impact of high-pressure gas, and no special limitation is made here.

[0047] Specifically in the embodiment, the first support frame 131 has a plurality of first positioning grooves 1312 on one side away from the first bottom plate 111, and one end of each first battery cell 132 is respectively arranged in the first positioning groove 1312, so that each first battery cell 132 is positioned by using each first positioning groove 1312. Each first vent hole 1311 is respectively located in each first positioning groove 1312. The first battery module 13 also includes a plurality of first protective sheets 135 arranged in each first positioning groove 1312 in a one-to-one correspondence. Each first protective sheet 135 is located between the corresponding first battery cell 132 and the first vent hole 1311, and each first protective sheet 135 has a second weak area 1351. The second weak area 1351 can be broken under the action of high-pressure gas. In this way, when any first battery cell 132 experiences thermal runaway, the high-pressure gas generated directly breaks through the second weak area 1351 on the corresponding first protective sheet 135, and then the high-pressure gas passes through the corresponding first vent hole 1311 to reach the space between the first protective plate 134 and the first support frame 131, and then the high-pressure gas 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, fireproof plastic sheet or other heat-resistant insulating material.

[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 in the first vent hole 1311, and has a better effect on accommodating 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 from the first vent hole 1311, the impact force of the high-pressure gas decreases rapidly, preventing the high-pressure gas from breaking through the second weak area 1351 on other first protective plates 135 and causing impact and thermal impact on other first battery cells 132 that have not experienced thermal runaway, that is, other first battery cells 132 that have not experienced thermal runaway are not easily impacted and thermally affected by the high-pressure gas, which greatly improves the overall safety performance of the double-layer battery.

[0049] Specifically in the embodiment, the first battery box 11 also 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 arranged opposite to the first bottom plate 111, and the plurality of first side plates 113 are connected between the first cover plate 112 and the first bottom plate 111, and are connected end to end, so that the first cover plate 112, the first bottom plate 111 and the first side plates 113 are enclosed together to form an inner cavity for accommodating the first battery module 13. The first explosion-proof valve 12 is installed on one of the first side plates 113.

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

[0051] Please attend Figures 2 to 4 In the embodiment of the present application, the second bottom 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 first bottom plate 111 in a direction away from the first bottom plate 111 to form a second recessed space b4. The second mounting area b1 is provided with a second through hole b6 connecting the second recessed space b4 with the interior of the second battery box 21. The second battery module 23 is arranged in the second battery box 21 and is located at the second mounting area b1 of the second bottom plate 211. The second air flow groove b3 is provided on the side of the second bottom plate 211 facing the first bottom plate 111 and is located in the second flow channel area b2 of the second bottom plate 211 and is connected to the second recessed space b4. The sealing ring 30 is arranged around the second mounting area b1 and the second flow channel area b2 of the second bottom plate 211, so as to seal the second recessed space b4 located in the second mounting area b1 on the second bottom plate 211 and the second air flow groove b3 located in the second flow channel area b2. In this way, 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 air flow groove b3 from the second recessed space b4, and then reaches the second explosion-proof valve 22 from the second air flow groove b3, which is beneficial to extend the gas flow path as much as possible, enhance the heat dissipation effect, and reduce the gas temperature reaching the second explosion-proof valve 22.

[0052] Specifically in the embodiment, a first harness hole a5 penetrating the first base plate 111 is provided on the first base plate 111, and the first harness hole a5 is located in an area outside the first mounting area a1 and the first flow channel area a2. A second harness hole b5 penetrating the second base plate 211 is provided on the second base plate 211, and the second harness hole b5 is located in an area outside the second mounting area b1 and the second flow channel area b2, and the first harness hole a5 is connected to the second harness hole b5. The first harness hole a5 and the second harness hole b5 are used for supplying power to the harness connecting the first battery module 13 and the second battery module 23. The sealing ring 30 is arranged around the first harness hole a5 and the second harness hole b5, so as to seal the first harness hole a5 and the second harness hole b5, so as to prevent the gas in the first recessed space a4, the second recessed area b4, the first airflow groove a3 and the second airflow groove b3 from entering the first harness hole a5 and the second harness hole b5. In this way, the first harness hole a5 and the second harness hole b5 are used to pass the harness for supplying power to connect the first battery module 13 and the second battery module 23, so that the first battery module 13 and the second battery module 23 are connected in series or in parallel by the harness.

[0053] Furthermore, the first battery box 11 or the second battery box 21 is provided with an electrical connection terminal 40 for connecting to an external charging or discharging circuit, and the electrical connection terminal 40 is electrically connected to the above-mentioned wiring harness, so that the first battery module 13 and the second battery module 23 are electrically connected to the external charging or discharging circuit through the wiring harness and the electrical connection terminal 40 in turn, thereby realizing the output or input (i.e., discharge or charge) of the electric energy of the double-layer battery. It is understandable that the electrical connection terminal 40 is set to two, and the two electrical connection terminals 40 are respectively a positive terminal and a negative terminal.

[0054] Furthermore, 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 arranged on the outside of the first bottom plate 111 and is located in the first installation area a1 of the first bottom plate 111. The second support column 60 is arranged on the outside of the second bottom plate 211 and is located in the second installation area b1 of the first bottom plate 111. The isolation plate 70 is arranged between each first support column 50 and each second support column 60 to separate the first recessed space a4 from the second recessed space b4. In this way, when any first battery cell 132 in the first battery module 13 undergoes thermal runaway, the high-pressure gas generated is sprayed from the first through hole a6 on the first bottom plate 111 onto the isolation plate 70, thereby avoiding the high-pressure gas from being directly sprayed onto the second bottom plate 211, that is, the isolation plate 70 plays a role in protecting the second bottom plate 211. Similarly, when any second battery cell 232232 in the second battery module 23 experiences thermal runaway, the high-pressure gas generated is sprayed from the second through hole b6 on the second bottom plate 211 onto the isolation plate 70, thereby preventing the high-pressure gas from being directly sprayed onto the first bottom plate 111, and the isolation plate 70 plays a role in protecting the first bottom plate 111. Optionally, the isolation plate 70 can be made of mica board, ceramic board, fireproof plastic board or other heat-resistant insulating material.

[0055] Specifically in the embodiment, since there is no isolation plate 70 between the first flow channel area a2 of the first bottom plate 111 and the second flow channel area b2 of the second bottom plate 211, the first air flow groove a3 located in the first flow channel area a2 and the second air flow groove b3 located in the second flow channel area b2 are interconnected. In this way, the high-pressure gas in the first recessed space a4 can enter the first air flow groove a3 and the second air flow groove b3, and then reach the first explosion-proof valve 12 and the second explosion-proof valve 22. When the air pressure at the first explosion-proof valve 12 and the second explosion-proof valve 22 reaches the preset pressure, the first explosion-proof valve 12 and the second explosion-proof valve 22 are depressurized. Similarly, the high-pressure gas in the second recessed space b4 can also enter the first air flow groove a3 and the second air flow groove b3, and enter and reach the first explosion-proof valve 12 and the second explosion-proof valve 22. When the air pressure at the first explosion-proof valve 12 and the second explosion-proof valve 22 reaches the preset pressure, the first explosion-proof valve 12 and the second explosion-proof valve 22 are depressurized. That is to say, the first air flow groove a3 and the second air flow groove b3 can serve as a larger channel for high-pressure gas to pass through, thereby increasing the capacity to accommodate high-pressure gas and enhancing the heat dissipation effect, which is beneficial to reducing the gas temperature reaching the first explosion-proof valve 12 and the second explosion-proof valve 22.

[0056] See also Figure 4Specifically, in the embodiment, the first battery module 10 further includes a first partition plate 114 disposed in the first battery box 11, and the first partition plate 114 is located between the first installation area a1 and the first flow channel area a2 of the first bottom plate 111, so as to separate the inner cavity of the first battery box 11 into a first battery cavity a9 and a first electric control cavity a8. The first battery cavity a9 is located on the side of the first partition plate 114 facing the first installation area a1, and the first battery module 13 is accommodated in the first battery cavity a9. The first electric control cavity a8 is located on the side of the first partition plate 114 facing the first flow channel area a2, and the first electric control cavity a8 is used to arrange electrical components, such as a battery management system, a relay, etc.

[0057] Furthermore, the bottom wall of the first air flow groove a3 is protruded toward the first electric control chamber a8 to increase the depth of the first air flow groove a3, so that the first air flow groove a3 has a large enough space for high-pressure gas to pass through, thereby increasing the capacity to accommodate high-pressure gas, enhancing the heat dissipation effect, and being conducive to reducing the temperature of the gas reaching the first explosion-proof valve 12 and the second explosion-proof valve 22. It should be noted that, since there is a surplus space in the first electric control chamber a8 for accommodating electrical components, the bottom wall of the first air flow groove a3 is protruded toward the first electric control chamber a8, occupying the space in the first electric control chamber a8 and increasing the space in the first air flow groove a3, that is, converting the surplus space in the first electric control chamber a8 into the space in the first air flow groove a3, avoiding the need to increase the thickness of the first bottom plate 111, and thus avoiding the increase in the height of the double-layer battery.

[0058] Specifically in the embodiment, the second battery module 20 also includes a second partition plate 214 disposed in the second battery box 21, and the second partition plate 214 is located between the second installation area b1 and the second flow channel area b2 of the second bottom plate 211 to separate the inner cavity of the second battery box 21 into a second battery cavity b9 and a second electric control cavity b8. The second battery cavity b9 is located on the side of the second partition plate 214 facing the second installation area b1, and the second battery module 23 is accommodated in the second battery cavity b9. The second electric control cavity b8 is located on the side of the second partition plate 214 facing the second flow channel area b2, and the second electric control cavity b8 is used to accommodate electrical components, such as a battery management system, a relay, etc.

[0059] Furthermore, the bottom wall of the second air flow groove b3 is protruded toward the second electric control chamber b8 to increase the depth of the second air flow groove b3, so that the second air flow groove b3 has a large enough space for high-pressure gas to pass through, thereby increasing the capacity to accommodate high-pressure gas, enhancing the heat dissipation effect, and being conducive to reducing the temperature of the gas reaching the first explosion-proof valve 12 and the second explosion-proof valve 22. It should be noted that, since there is a surplus space in the second electric control chamber b8 for accommodating electrical components, the bottom wall of the second air flow groove b3 is protruded toward the second electric control chamber b8, occupying the space in the second electric control chamber b8 and increasing the space in the second air flow groove b3, that is, converting the surplus space in the second electric control chamber b8 into the space in the second air flow groove b3, avoiding the need to increase the thickness of the second bottom plate 211, thereby avoiding the increase in the height of the double-layer battery.

[0060] See also Figure 4 , Figures 8 to 10 Specifically, in the embodiment, 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 installation area b1 of the second bottom plate 211, and each second battery cell 232 is arranged on the side of the third support frame 231 away from the second bottom plate 211. The fourth support frame 233 is arranged at one end of each second battery cell 232 away from the third support frame 231, and is fixedly connected to the third support frame 231 by screw locking and fixing, so that each second battery cell 232 is fixed between the third support frame 231 and the fourth support frame 233. The third support frame 231 has second vent holes 2311 corresponding to each second battery cell 232, so that the high-pressure gas ejected when the second battery cell 232 has thermal runaway can pass through the corresponding second vent holes 2311 through the third support frame 231, and then enter the second recessed space b4 through the second through hole b6 on the second bottom plate 211, and then reach the second explosion-proof valve 22 through the second air flow groove b3.

[0061] Furthermore, the second battery module 23 also includes a second protective plate 234 disposed between the second bottom plate 211 and the third support frame 231. The second protective plate 234 has a plurality of third weak areas 2341, each of which can be broken under the action of high-pressure gas. In this way, when the second battery cell 232 is in 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, so that the corresponding third weak area 2341 on the second protective plate 234 is broken under the action of high-pressure gas, and then the high-pressure gas enters the second recessed space b4 through the broken third weak area 2341 and the second through hole b6 on the second bottom plate 211. The provision of the second protective plate 234 prevents the high-pressure gas from directly impacting the second bottom plate 211 of the second battery box 21, thereby protecting the second bottom plate 211 of the second battery box 21. Optionally, the second protective plate 234 can be made of mica board, ceramic board, fireproof plastic board or other heat-resistant insulating material.

[0062] It should be noted that, as an 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, so that the strength of the third weak area 2341 is lower, and the third weak area 2341 can be broken 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 notching, as long as the strength of the third weak area 2341 can be weakened so that it can be broken under the impact of high-pressure gas, and no special limitation is made here.

[0063] Specifically in the embodiment, the third support frame 231 has a plurality of second positioning grooves 2312 on one side away from the second bottom plate 211, and one end of each second battery cell 232 is respectively arranged in the second positioning groove 2312, so that each second battery cell 232 is positioned by using each second positioning groove 2312. Each second vent 2311 is respectively located in each second positioning groove 2312. The second battery module 23 also includes a plurality of second protective sheets 235 arranged in each second positioning groove 2312 in a one-to-one correspondence. Each second protective sheet 235 is located between the corresponding second battery cell 232 and the second vent 2311, and each first protective sheet 135 has a fourth weak area 2351. The fourth weak area 2351 can be broken under the action of high-pressure gas. In this way, when any second battery cell 232 experiences thermal runaway, the high-pressure gas generated directly breaks through the fourth weak area 2351 on the corresponding second protective sheet 235, and then the high-pressure gas passes through the corresponding second vent hole 2311 and reaches the space between the second protective plate 234 and the third support frame 231, and then the high-pressure gas 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, fireproof plastic sheet or other heat-resistant insulating material.

[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 in the second vent hole 2311, and has a better effect on accommodating high-pressure gas. After the high-pressure gas breaks through the fourth weak area 2351 on the second protective plate 235 and enters the space between the second protective plate 234 and the third support frame 231 from the second vent hole 2311, the impact force of the high-pressure gas decreases rapidly, preventing the high-pressure gas from breaking through the fourth weak area 2351 on other second protective plates 235 and causing impact and thermal impact on other second battery cells 232 that have not experienced thermal runaway, that is, other second battery cells 232 that have not experienced thermal runaway are not easily impacted and thermally affected by the high-pressure gas, which greatly improves the overall safety performance of the double-layer battery.

[0065] Specifically in the embodiment, the second battery box 21 further includes a plurality of second side plates 213 and a second cover plate 212. The second cover plate 212 is arranged opposite to the second bottom plate 211, and the plurality of 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 second side plate 213 are enclosed together to form an inner cavity for accommodating the second battery module 23. The second explosion-proof valve 22 is installed on one of the second side plates 213.

[0066] Further, the second side plate 213 on which the second explosion-proof valve 22 is installed has a second connecting channel b7, and the second connecting channel b7 is used to connect the second explosion-proof valve 22 thereon with the second air flow groove b3 on the second bottom plate 211. Optionally, the second side plate 213 on which the second explosion-proof valve 22 is installed adopts a profile plate, and the cavity in the profile plate serves as the second connecting channel b7.

[0067] Based on the above double-layer battery, the present invention 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, and the like; the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, for example, 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, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electric devices.

[0068] 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.

[0069] 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 double-layer battery, characterized in that: include: A first battery module (10), comprising a first battery box (11), a first explosion-proof valve (12), and a first battery module (13) arranged in the first battery box (11), wherein the first explosion-proof valve (12) is arranged on the first battery box (11), the first battery box (11) has a first bottom plate (111) serving as a side wall of the first battery box (11), and a side of the first bottom plate (111) facing away from the first battery module (13) has a first air flow groove (a3) ​​connecting the interior of the first battery box (11) and the first explosion-proof valve (12); A second battery module (20), comprising a second battery box (21), a second explosion-proof valve (22), and a second battery module (23) arranged in the second battery box (21), the second explosion-proof valve (22) being arranged on the second battery box (21), the second battery box (21) having a second bottom plate (211) serving as a side wall of the second battery box (21), the second bottom plate (211) having a second air flow groove (b3) connecting the interior of the second battery box (21) and the second explosion-proof valve (22) on a side facing away from the second battery module (23); the first battery box (11) and the second battery box (21) are fixedly connected, and the first bottom plate (111) and the second bottom plate (211) are opposite to each other; and A sealing ring (30) is arranged between the first bottom plate (111) and the second bottom plate (211) and is used to seal the first air flow groove (a3) ​​and the second air flow groove (b3).

2. The double-layer battery according to claim 1, characterized in that: The first base plate (111) includes a first installation area (a1) and a first flow channel area (a2); a surface of the first installation area (a1) on one side 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 installation area (a1) is provided with a first through hole (a6) connecting the first recessed space (a4) with the interior of the first battery box (11); the first battery module (13) is arranged in the first installation area (a1); the first air flow groove (a3) ​​is provided in the first flow channel area (a2) and is connected to the first recessed space (a4); the sealing ring (30) is arranged around the first installation area (a1) and the first flow channel area (a2).

3. The double-layer battery according to claim 2, characterized in that: The first battery module (13) comprises a first support frame (131), a plurality of first battery cells (132) and a second support frame (133); the first support frame (131) is mounted on the first mounting area (a1) of the first base plate (111); each of the first battery cells (132) is arranged on a side of the first support frame (131) away from the first base plate (111); the second support frame (133) is arranged on an end of each of the first battery cells (132) away from the first support frame (131) and is fixedly connected to the first support frame (131); The first support frame (131) has first vent holes (1311) corresponding to each of the first battery cells (132) one by one, so that high-pressure gas ejected when the first battery cells (132) thermally run away can enter the first recessed space (a4) through the corresponding first vent holes (1311) and the first through holes (a6).

4. The double-layer battery according to claim 3, characterized in that: The first battery module (13) further comprises a first protective plate (134) arranged between the first bottom plate (111) and the first support frame (131), the first protective plate (134) having a plurality of first weak areas (1341), each of the first weak areas (1341) being capable of being ruptured under the action of high-pressure gas.

5. The double-layer battery according to claim 3, characterized in that: The first support frame (131) has a plurality of first positioning grooves (1312) on one side facing away from the first bottom plate (111), one end of each of the first battery cells (132) is respectively arranged 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) further comprises a plurality of first protective sheets (135) arranged one by one in each of the first positioning grooves (1312), each of the first protective sheets (135) being located between the corresponding first battery cell (132) and the first vent hole (1311), and each of the first protective sheets (135) having a second weak area (1351), the second weak area (1351) being capable of being ruptured under the action of high-pressure gas.

6. The double-layer battery according to claim 2, characterized in that: The second base plate (211) includes a second installation area (b1) and a second flow channel area (b2); a side surface of the second installation 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 installation area (b1) is provided with a second through hole (b6) connecting the second recessed space (b4) with the interior of the second battery box (21); the second battery module (23) is installed in the second installation area (b1); the second air flow groove (b3) is provided in the second flow channel area (b2) and is connected to the second recessed space (b4); the sealing ring (30) is arranged around the second installation area (b1) and the second flow channel area (b2).

7. The double-layer battery according to claim 6, characterized in that: The first base plate (111) is provided with a first harness hole (a5) penetrating the first base plate (111), and the first harness hole (a5) is located in an area outside the first installation area (a1) and the first flow channel area (a2); the second base plate (211) is provided with a second harness hole (b5) penetrating the second base plate (211), and the second harness hole (b5) is located in an area outside the second installation area (b1) and the second flow channel area (b2), and is connected to the first harness hole (a5), and the first harness hole (a5) and the second harness hole (b5) are used for passing a harness for supplying power to connect the first battery module (13) and the second battery module (23); The sealing ring (30) is arranged around the first wiring harness hole (a5) and the second wiring harness hole (b5).

8. The double-layer battery according to claim 6, characterized in that: The double-layer battery further comprises a first support column (50), a second support column (60) and an isolation plate (70), wherein the first support column (50) is arranged on the outer side of the first bottom plate (111) and is located in the first installation area (a1), the second support column (60) is arranged on the outer side of the second bottom plate (211) and is located in the second installation area (b1), and the isolation plate (70) is arranged between each of the first support columns (50) and each of the second support columns (60) to separate the first recessed space (a4) from the second recessed space (b4).

9. The double-layer battery according to claim 6, characterized in that: The second battery module (23) comprises a third support frame (231), a plurality of second battery cells (232) and a fourth support frame (233); the third support frame (231) is mounted on the second mounting area (b1) of the second bottom plate (211); each of the second battery cells (232) is arranged on a side of the third support frame (231) away from the second bottom plate (211); the fourth support frame (233) is arranged on an end of each of the second battery cells (232) away from the third support frame (231) and is fixedly connected to the third support frame (231); The third support frame (231) has second vent holes (2311) corresponding to each of the second battery cells (232) one by one, so that the high-pressure gas ejected when the second battery cells (232) are in thermal runaway can enter the second recessed space (b4) through the corresponding second vent holes (2311) and the second through holes (b6); the second battery module (23) also includes a second protective plate (234) arranged between the second bottom plate (211) and the third support frame (231), and the second protective plate (234) has a plurality of third weak areas (2341), and each of the third weak areas (2341) can be ruptured under the action of high-pressure gas.

10. An electrical device comprising the double-layer battery according to any one of claims 1 to 9.

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