Battery bottom support structure and battery

Abstract

The utility model relates to a battery bottom support structure and a battery. In the battery bottom support structure, a substrate is used for supporting a core package; the support is arranged on the battery bottom shell, the base plate is arranged on the support, and a pressure relief channel is defined by the base plate, the support and the battery bottom shell; the separator is arranged on the substrate and is used for sealing the substrate so as to separate the core package from the pressure relief channel, and when the core package is subjected to thermal runaway, sprayed matter generated by the thermal runaway of the core package can dissolve the separator, so that the core package is communicated with the pressure relief channel, and the sprayed matter generated by the thermal runaway of the core package can smoothly enter the pressure relief channel; and the air is discharged to the external environment through the explosion-proof valve of the battery bottom shell, so that the gap between the core bag and the battery bottom shell is enlarged on the premise of not reducing the energy density of the battery as much as possible, an air flow channel between the core bag of the battery and the explosion-proof valve of the battery bottom shell is further enlarged, and high pressure and jets generated by thermal runaway of the battery are isolated; and the valve opening smoothness of the anti-explosion valve during thermal runaway of the battery is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery base structure and a battery. Background Art

[0002] With the rapid development of science and technology, batteries have become an important source of energy for electrical equipment such as vehicles. With the widespread application of batteries, the safety of batteries has also received more and more attention. The positive and negative poles of batteries are usually set on the same end face as the explosion-proof valve, resulting in the interaction between the circuit system and the gas system. When the battery has thermal runaway, the explosion-proof valve opens to release the pressure, and the high-temperature and high-pressure gas ejected from the battery damages the circuit system above the battery, and even causes explosions and other accidents.

[0003] In the prior art, in order to isolate the high pressure and ejecta generated by battery thermal runaway and reduce the protection cost of battery thermal runaway, some batteries currently have explosion-proof valves installed at the bottom of the battery. However, the gap between the battery core pack and the explosion-proof valve is very small. When the battery thermal runaway occurs, it is difficult for the gas to break open the explosion-proof valve, causing the battery to crack or explode at the outer shell welding point. Utility Model Content

[0004] Based on this, it is necessary to provide a battery bottom support structure and battery that can isolate the high pressure and ejecta generated by thermal runaway of the battery, while increasing the airflow channel between the battery core pack and the explosion-proof valve, and improving the smoothness of opening the explosion-proof valve during thermal runaway of the battery, in order to address the problems existing in the above-mentioned existing batteries.

[0005] In a first aspect, the present application provides a battery base structure, comprising:

[0006] A base plate, which is used to support the core package;

[0007] A bracket, wherein the bracket is arranged on the battery bottom shell, the substrate is arranged on the bracket, and the substrate, the bracket and the battery bottom shell are surrounded to form a pressure relief channel;

[0008] The isolating member is arranged on the substrate and is used to seal the substrate to isolate the core package from the pressure relief channel.

[0009] In one embodiment, the substrate is provided with a first through hole region; the isolation member is used to seal the first through hole region;

[0010] When thermal runaway occurs in the core package, the first through hole area is connected to allow the first through hole area to communicate with the pressure relief channel.

[0011] In one embodiment, the substrate is further provided with a second through hole region; the isolation member is used to seal the second through hole region;

[0012] When thermal runaway occurs in the core package, the second through hole area is connected to make the second through hole area communicate with the pressure relief channel.

[0013] In one of the embodiments, the second through-hole region includes a first through-hole sub-region and a second through-hole sub-region;

[0014] The first via region is located between the first via sub-region and the second via sub-region.

[0015] In one embodiment, the first through-hole sub-region includes a plurality of first through-holes, and the second through-hole sub-region includes a plurality of second through-holes;

[0016] The size of the first through hole is equal to the size of the second through hole.

[0017] In one of the embodiments, the first through hole region includes a plurality of third through holes;

[0018] The size of the third through hole is greater than that of the first through hole.

[0019] In one embodiment, the spacer is located between the substrate and the support;

[0020] The first through hole and the isolating member are combined to form a first groove, which is used to contain residual liquid in the battery; the second through hole and the isolating member are combined to form a second groove, which is used to contain residual liquid in the battery; the third through hole and the isolating member are combined to form a third groove, which is used to contain residual liquid in the battery.

[0021] In one embodiment, the bracket includes a first support rod and a second support rod;

[0022] The first support rod is arranged along the length direction of the substrate, the second support rod is arranged along the length direction of the substrate, and the first support rod is arranged at an interval from the second support rod.

[0023] In one embodiment, the distance between the substrate and the battery bottom shell ranges from 3 mm to 5 mm.

[0024] In a second aspect, the present application provides a battery, including a core pack, a battery bottom shell, and a battery bottom support structure as described above;

[0025] The battery bottom support structure is arranged on the battery bottom shell, and the core pack is arranged on the battery bottom support structure.

[0026] In one embodiment, the battery further comprises pins; a pole ear is arranged on the side of the core package, and a pole column is arranged on the top surface of the core package;

[0027] The pins are connected between the lugs and the poles.

[0028] One of the above technical solutions has the following advantages and beneficial effects:

[0029] The above-mentioned battery bottom support structure includes a substrate, a bracket and an isolating member, the substrate is used to support the core package; the bracket is arranged on the battery bottom shell, the substrate is arranged on the bracket, and the substrate, the bracket and the battery bottom shell are enclosed to form a pressure relief channel; the isolating member is arranged on the substrate, and the isolating member is used to seal the substrate to isolate the core package from the pressure relief channel. When the core package has thermal runaway, the ejecta generated by the thermal runaway of the core package can dissolve the isolating member, so that the core package and the pressure relief channel are connected, and then the ejecta can smoothly enter the pressure relief channel and be discharged to the external environment through the explosion-proof valve of the battery bottom shell. The present application improves the structural design of the battery bottom support and arranges a bracket between the substrate and the battery bottom shell to increase the gap between the core pack and the battery bottom shell without reducing the battery energy density as much as possible, thereby increasing the air flow channel between the core pack of the battery and the explosion-proof valve of the battery bottom shell; by arranging an isolating member on the substrate, when the core pack has thermal runaway, the ejecta generated by the thermal runaway of the core pack can dissolve the isolating member, so that the core pack and the pressure relief channel are connected, and the ejecta can be ejected into the pressure relief channel, so that the explosion-proof valve on the battery bottom shell is opened smoothly, thereby isolating the high pressure and ejecta generated by the thermal runaway of the battery, and improving the opening smoothness of the explosion-proof valve when the battery has thermal runaway. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic structural diagram of the battery base structure from a first perspective in an embodiment of the present application;

[0031] Figure 2 This is a schematic structural diagram of the battery base structure from a second viewing angle in an embodiment of the present application;

[0032] Figure 3 This is a schematic structural diagram of the battery base structure from a third viewing angle in an embodiment of the present application;

[0033] Figure 4 This is a schematic diagram of the exploded structure of the battery base structure in the embodiment of the present application;

[0034] Figure 5 This is a schematic cross-sectional view of the battery base structure in the embodiment of the present application;

[0035] Figure 6 This is a schematic diagram of the first-view structure of the battery in an embodiment of the present application.

[0036] Reference numerals:

[0037] 100, substrate; 110, first through hole area; 112, third through hole; 120, second through hole area; 122, first through hole sub-area; 1222, first through hole; 124, second through hole sub-area; 1242, second through hole; 200, bracket; 210, first support rod; 220, second support rod; 300, isolation member; 400, pressure relief channel; 500, core pack; 510, battery bottom shell; 520, explosion-proof valve; 530, pole ear; 540, pole column; 600, pin. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0039] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover inclusions that are not listed. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0040] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0041] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0042] In addition, the term "plurality" shall mean two or more.

[0043] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0044] In the traditional battery structure, pole ears are arranged on both sides of the core package, the pole ears are welded on the pins, and the pins are welded upward to the poles on the top surface of the core package; the explosion-proof valve is arranged on the cover plate on the top surface of the battery. Since the pressure relief requires an air path gap and in order to improve the safety of the battery, the top surface of the core package needs to be insulated, and usually a lower plastic of a certain thickness (such as 3mm) is arranged between the core package and the explosion-proof valve; and in order to isolate the core package from the battery bottom shell, a bottom support of a certain thickness (such as 0.5mm) needs to be arranged between the bottom surface of the core package and the battery bottom shell. When the core package has thermal runaway, the explosion-proof valve opens to relieve pressure, and the high-temperature and high-pressure gas ejected from the core package will damage the circuit system above the battery, and even cause accidents such as explosions.

[0045] The present application improves the battery base structure. In one example, Figure 6 As shown, the battery bottom support structure of the present application can be applied to batteries with poles arranged on the top surface and explosion-proof valves arranged on the bottom surface. There is no need to set lower plastic on the top surface of the core pack, thereby compressing the gap above the core pack. By setting the battery bottom support structure between the core pack and the battery bottom shell, the gap between the core pack and the battery bottom shell can be increased, thereby increasing the airflow path between the bottom surface of the core pack and the explosion-proof valve without reducing the battery energy density as much as possible.

[0046] In one embodiment, Figure 1 , Figure 4 , Figure 5 and Figure 6 As shown, a battery bottom support structure is provided, including a substrate 100, a bracket 200 and an isolating member 300; the substrate 100 is used to support a core pack 500; the bracket 200 is arranged on a battery bottom shell 510, the substrate 100 is arranged on the bracket 200, and a pressure relief channel 400 is enclosed between the substrate 100, the bracket 200 and the battery bottom shell 510; the isolating member 300 is arranged on the substrate 100, and the isolating member 300 is used to seal the substrate 100 to isolate the core pack 500 from the pressure relief channel 400.

[0047] The core pack 500 may be a lithium core pack, and the core pack 500 may be in a square structure, for example, the core pack 500 may be in a rectangular shape, and the top surface of the core pack 500 is provided with a pole 540. The battery bottom shell 510 is the bottom surface of the battery shell, and the battery shell is used to wrap the core pack 500. For example, the battery shell may be, but is not limited to, a shell made of aluminum. The battery bottom shell 510 is provided with an explosion-proof valve 520.

[0048] The substrate 100 is used to support the core package 500. The size and shape of the substrate 100 can be determined according to the size and shape of the bottom surface of the core package 500. For example, if the bottom surface of the core package 500 is rectangular, the shape of the substrate 100 is rectangular. In another example, the width of the substrate 100 matches the width of the battery bottom shell 510, and the length of the substrate 100 matches the length of the battery bottom shell 510, so that the battery bottom shell 510 can completely cover the substrate 100.

[0049] The bracket 200 is disposed between the battery bottom shell 510 and the substrate 100. The bracket 200 can be used to support the substrate 100, so that a gap is formed between the substrate 100 and the battery bottom shell 510, and then the substrate 100, the bracket 200 and the battery bottom shell 510 enclose a pressure relief channel 400. Exemplarily, the bracket 200 can be disposed on the substrate 100 by bonding or welding; in another example, the bracket 200 and the substrate 100 are an integrally formed structure.

[0050] The spacer 300 may be a film-like structure; the spacer 300 may be covered and arranged on the substrate 100 to seal the substrate 100. Exemplarily, the spacer 300 may be arranged on the substrate 100 by bonding methods such as hot pressing. When the core package is in a normal state, based on the isolation between the core package and the pressure relief channel by the spacer, the spacer 300 can be used to accommodate the residual electrolyte of the core package 500 to prevent the residual electrolyte from entering the pressure relief channel and causing the pressure relief channel to be blocked; when the core package 500 has a thermal runaway, the high-temperature and high-pressure ejecta generated by the thermal runaway of the core package 500 will dissolve the spacer 300, so that the substrate is conductive, and then an air flow path is formed between the core package 500 and the pressure relief channel 400. After the ejecta enters the pressure relief channel 400, it will open the explosion-proof valve 520 of the battery bottom shell, so that the explosion-proof valve 520 is opened, so that the ejecta can be discharged to the external environment in time to avoid the internal pressure of the battery from being too high and causing an explosion. Exemplarily, the substrate 100 has a first surface and a second surface, the first surface is opposite to the second surface, the bracket 200 is arranged on the first surface of the substrate 100, and the isolation member 300 is arranged on the second surface of the substrate 100; in another example, the bracket 200 is arranged on the first surface of the substrate 100, and the isolation member 300 is arranged on the first surface of the substrate 100.

[0051] In the above-mentioned embodiment, the substrate 100 is used to support the core package 500; the bracket 200 is arranged on the battery bottom shell 510, and the substrate 100 is arranged on the bracket 200, and the substrate 100, the bracket 200 and the battery bottom shell 510 enclose a pressure relief channel 400; the isolation member 300 is arranged on the substrate 100, and the isolation member 300 is used to seal the substrate 100 to isolate the core package 500 from the pressure relief channel 400, so that the ejecta generated by the thermal runaway of the core package 500 can dissolve the isolation member 300, and then the ejecta can smoothly enter the pressure relief channel 400. The present application improves the structure of the battery base and sets a bracket 200 between the substrate 100 and the battery bottom shell 510. Under the premise of not reducing the battery energy density as much as possible, the gap between the core pack 500 and the battery bottom shell 510 is increased, thereby increasing the air flow channel between the core pack 500 of the battery and the explosion-proof valve of the battery bottom shell 510; by setting the isolation member 300 on the substrate 100, when the core pack 500 has thermal runaway, the ejecta generated by the thermal runaway of the core pack 500 can dissolve the isolation member 300, so that the core pack 500 and the pressure relief channel 400 are connected, and the ejecta can be ejected into the pressure relief channel 400, so that the explosion-proof valve 520 on the battery bottom shell 510 is opened smoothly, thereby isolating the high pressure and ejecta generated by the thermal runaway of the battery, and improving the opening smoothness of the explosion-proof valve when the battery has thermal runaway.

[0052] In one embodiment, the substrate 100 is provided with a first through hole area 110 ; the isolation member 300 is used to seal the first through hole area 110 ; when the core package 500 has thermal runaway, the first through hole area 110 is opened to connect the first through hole area 110 with the pressure relief channel 400 .

[0053] Among them, a first through hole area 110 is provided on the substrate 100 , and the first through hole area 110 corresponds to the explosion-proof valve 520 on the battery bottom shell 510 . When the explosion-proof valve 520 is opened, the first through hole area 110 is connected to the explosion-proof valve 520 .

[0054] When the first through hole area 110 is turned on, the pressure relief channel 400 is connected to the first through hole area 110, so that the ejecta generated by the thermal runaway of the core package 500 can enter the pressure relief channel 400 through the first through hole area 110, so that the ejecta can break through the explosion-proof valve 520, so that the explosion-proof valve 520 on the battery bottom shell 510 can be opened smoothly; when the first through hole area 110 is closed, the pressure relief channel 400 is a closed space structure, which prevents the residual electrolyte in the core package 500 from entering the pressure relief channel 400.

[0055] The spacer 300 may be arranged to cover the first through hole area 110 to seal the first through hole area 110. The spacer 300 may be used to contain the electrolyte remaining in the core package 500. When the core package 500 undergoes thermal runaway, the high-temperature and high-pressure ejecta generated by the thermal runaway of the core package 500 will dissolve the spacer 300, making the first through hole area 110 conductive, thereby forming an air flow path from the first through hole area 110 to the pressure relief channel 400. After the ejecta enters the pressure relief channel 400, it rushes open the explosion-proof valve 520, so that the explosion-proof valve 520 opens, so that the ejecta can be discharged to the external environment in time, avoiding the explosion caused by excessive internal pressure of the battery.

[0056] In the above-mentioned embodiment, by improving the structure of the battery bottom support and setting a bracket 200 between the substrate 100 and the battery bottom shell 510, the gap between the core pack 500 and the battery bottom shell 510 is increased without reducing the battery energy density as much as possible, thereby increasing the air flow channel between the core pack 500 of the battery and the explosion-proof valve of the battery bottom shell 510; by setting the isolation member 300 on the substrate 100 and sealing the first through hole area 110 on the substrate 100, when the core pack 500 has a thermal runaway, the ejecta generated by the thermal runaway of the core pack 500 can dissolve the isolation member 300, so that the first through hole area 110 on the substrate 100 is conductive, and then the ejecta can be ejected into the pressure relief channel 400, so that the explosion-proof valve 520 on the battery bottom shell 510 is opened smoothly, thereby isolating the high pressure and ejecta generated by the thermal runaway of the battery, and improving the smoothness of the opening of the explosion-proof valve when the battery has a thermal runaway.

[0057] In one embodiment, Figure 3 As shown, the substrate 100 is further provided with a second through hole area 120 ; the isolation member 300 is used to seal the second through hole area 120 ; when the core package 500 has thermal runaway, the second through hole area 120 is conducted to connect the second through hole area 120 with the pressure relief channel 400 .

[0058] Among them, the second through hole area 120 can be used to introduce the high-pressure gas generated by thermal runaway of the core package into the pressure relief channel. The range of the second through hole area 120 is larger than the range of the first through hole area 110. Exemplarily, the second through hole area 120 can be arranged on the periphery of the first through hole area 110.

[0059] The isolation member 300 can also be used to cover the second through hole area 120, thereby sealing the second through hole area 120. When the core package 500 undergoes thermal runaway, the high-temperature and high-pressure ejecta generated by the thermal runaway of the core package 500 will dissolve the isolation member 300, so that the first through hole area 110 and the second through hole area 120 are connected, thereby forming a first air flow path from the first through hole area 110 to the pressure relief channel 400, and a second air flow path from the second through hole area 120 to the pressure relief channel 400, so that the high-pressure gas generated by the core package can be quickly introduced into the pressure relief channel 400 through the second through hole area 120, thereby increasing the pressure relief speed of the core package; in addition, the core package 500 generates The ejecta can quickly enter the pressure relief channel 400 through the first air flow channel, so that the ejecta can break open the explosion-proof valve 520, causing the explosion-proof valve 520 to open, so that the ejecta can be discharged to the external environment in time. By setting the second through-hole area, the pressure relief air flow channel of the core package is increased, and rapid pressure relief can be achieved when thermal runaway occurs in the core package, avoiding explosion caused by excessive internal pressure of the battery, isolating the high pressure generated by thermal runaway of the battery from the ejecta, further improving the opening smoothness of the explosion-proof valve when the battery is in thermal runaway, and improving the safety of the battery.

[0060] In one embodiment, Figure 3 As shown, the second through-hole region 120 includes a first through-hole sub-region 122 and a second through-hole sub-region 124 ; the first through-hole region 110 is located between the first through-hole sub-region 122 and the second through-hole sub-region 124 .

[0061] For example, if the first through hole region 110 is located in the middle of the substrate 100, the first through hole sub-region 122 may be arranged on one side of the first through hole region 110, and the second through hole sub-region 124 may be arranged on the other side of the first through hole region 110. The isolation member 300 can cover the first through hole sub-region 122, the second through hole sub-region 124 and the first through hole region 110 to seal the first through hole sub-region 122, the second through hole sub-region 124 and the first through hole region 110. When the core package 500 undergoes thermal runaway, the high temperature and high pressure ejecta generated by the thermal runaway of the core package 500 will dissolve the isolation member 300, so that the first through hole sub-region 122, the second through hole sub-region 124 and the first through hole region 110 are connected, thereby forming a first airflow path from the first through hole region 110 to the pressure relief channel 400, a second airflow path from the first through hole sub-region 122 to the pressure relief channel 400 and a second airflow path from the second through hole sub-region 124 to the pressure relief channel 400. 4 to the third air flow channel of the pressure relief channel 400, so that the ejecta (gas) generated by the core package 500 can quickly enter the pressure relief channel 400 through the first air flow channel, the second air flow channel and the third air flow channel, so that the ejecta can break through the explosion-proof valve 520, so that the explosion-proof valve 520 is opened, so that the ejecta can be discharged to the external environment in time, avoiding the explosion caused by excessive internal pressure of the battery, isolating the high pressure and ejecta generated by thermal runaway of the battery, ensuring the air flow channel from the side of the core package 500 to the bottom, increasing the air flow channel between the core package 500 and the pressure relief channel 400, improving the valve opening smoothness of the explosion-proof valve when the battery is thermally runaway, and improving the safety of the battery.

[0062] In one embodiment, Figure 1 and Figure 3 As shown, the first through hole sub-region 122 includes a plurality of first through holes 1222 , and the second through hole sub-region 124 includes a plurality of second through holes 1242 ; the size of the first through hole 1222 is equal to the size of the second through hole 1242 .

[0063] The first through holes 1222 may be arranged in a matrix of multiple rows and columns, and the second through holes 1242 may be arranged in a matrix of multiple rows and columns. The shape of the first through holes 1222 may be, but not limited to, circular, elliptical, or polygonal, and the shape of the second through holes 1242 may be, but not limited to, circular, elliptical, or polygonal. Exemplarily, the first through holes 1222 and the second through holes 1242 have the same shape and size.

[0064] Exemplarily, each first through hole 1222 in the first through hole sub-region 122 is arranged at an equal distance, and each second through hole 1242 in the second through hole sub-region 124 is arranged at an equal distance, and the isolation member 300 can cover each first through hole 1222 and each second through hole 1242, thereby sealing each first through hole 1222 and each second through hole 1242. It should be noted that the size of the first through hole 1222 and the size of the second through hole can be determined according to the volume of the core package 500. By setting the size of the first through hole 1222 to be equal to the size of the second through hole 1242, the high-pressure gas generated by the thermal runaway of the core package 500 can evenly pass through each first through hole 1222 in the first through hole sub-region 122 and each second through hole 1242 in the second through hole sub-region 124 into the pressure relief channel, so that the substrate is evenly stressed, and damage caused by uneven stress on the substrate is avoided.

[0065] When the core package 500 experiences thermal runaway, the high-temperature and high-pressure ejecta generated by the thermal runaway of the core package 500 will dissolve the isolation piece 300, thereby making each first through hole 1222 in the first through hole sub-region 122 conductive, and each second through hole 1242 in the second through hole sub-region 124 conductive, thereby forming a first air flow path from the first through hole region 110 to the pressure relief channel 400 and a second air flow channel from the first through hole sub-region 122 to the pressure relief channel 400, so that the ejecta (gas) generated by the core package 500 can quickly enter the pressure relief channel 400 through the first air flow channel and the second air flow channel, thereby increasing the air flow channel between the core package 500 and the pressure relief channel 400, and ensuring the air flow channel from the side of the core package 500 to the pressure relief channel 400, thereby improving the pressure relief efficiency of the core package 500 when it experiences thermal runaway.

[0066] In one embodiment, Figure 1 , Figure 3 and Figure 4 As shown, the first through hole area 110 includes a plurality of third through holes 112 ; the size of the third through holes 112 is greater than the size of the first through holes 122 .

[0067] Among them, each third through hole 112 can be arranged in a matrix of multiple rows and columns, and the shape of the third through hole 112 can be, but is not limited to, circular, elliptical or polygonal. Each third through hole 112 is set corresponding to the explosion-proof valve 520 of the battery bottom shell 510. The third through hole 112 can be used to transmit the ejection transmitted by the thermal runaway of the core package 500. The size of the third through hole 112 is set to be larger than the size of the first through hole 1222 or the second through hole 1242, so that the ejection generated by the thermal runaway of the core package 500 can be ejected to the explosion-proof valve 520 of the battery bottom shell 510 through each third through hole 112, so that the explosion-proof valve is opened, thereby improving the opening efficiency of the explosion-proof valve. It should be noted that the size of the third through hole 112 can be determined according to the size of the core package and the size of the explosion-proof valve of the battery bottom shell.

[0068] Exemplarily, the third through holes 112 in the first through hole area 110 are arranged at equal intervals, and the isolation member 300 can cover the third through holes 112, thereby sealing the third through holes 112. When the core package 500 has thermal runaway, the high-temperature and high-pressure ejecta generated by the thermal runaway of the core package 500 will dissolve the isolation member 300, so that the third through holes 112 are connected, thereby forming an air flow path from the third through holes 112 to the pressure relief channel 400, and the ejecta (gas) generated by the core package 500 can quickly enter the pressure relief channel 400 through the corresponding air flow channel, so that the ejecta can flush the explosion-proof valve 520, so that the explosion-proof valve 520 is opened, so that the ejecta can be discharged to the external environment in time, avoiding the explosion caused by excessive internal pressure of the battery, isolating the high pressure and ejecta generated by the thermal runaway of the battery, improving the smoothness of the opening of the explosion-proof valve during the thermal runaway of the battery, and improving the safety of the battery.

[0069] In one embodiment, Figure 2 and Figure 5 As shown, the isolation member 300 is located between the substrate 100 and the bracket 200; the first through hole 1222 and the isolation member 300 are combined to form a first groove, and the first groove is used to contain residual liquid in the battery; the second through hole 1242 and the isolation member 300 are combined to form a second groove, and the second groove is used to contain residual liquid in the battery; the third through hole 112 and the isolation member 300 are combined to form a third groove, and the third groove is used to contain residual liquid in the battery.

[0070] Exemplarily, the spacer 300 may be, but is not limited to, a polyurethane film or a polyethylene film. Exemplarily, the spacer 300 is bonded to the first surface of the substrate 100, and the first through holes 1222, the second through holes 1242, and the third through holes 112 are sealed by the spacer 300; the bracket 200 is disposed on the spacer 300, so that the spacer 300 is located between the substrate 100 and the bracket 200. The second plate surface of the substrate 100 is used to support the core package 500. The first through hole 1222 and the corresponding part of the isolation member 300 are combined to form a first groove, the second through hole 1242 and the corresponding part of the isolation member 300 are combined to form a second groove, and the third through hole 112 and the corresponding part of the isolation member 300 are combined to form a third groove. When the battery is used normally, the residual battery liquid (electrolyte) remaining in the core package 500 can be accommodated by the first grooves, the second grooves and the third grooves, thereby avoiding the problem that the residual electrolyte in the core package 500 cannot be absorbed due to the increase in the thickness of the bottom support structure.

[0071] When the core package 500 has a thermal runaway, the high-temperature and high-pressure ejecta generated by the thermal runaway of the core package 500 will dissolve the isolation piece 300, so that each of the first grooves, each of the second grooves and each of the third grooves are conductive, thereby increasing the airflow channel from the core package 500 to the pressure relief channel 400, and ensuring the airflow channel from the side of the core package 500 to the pressure relief channel 400. The ejecta (gas) generated by the core package 500 can quickly enter the pressure relief channel 400 through the corresponding airflow channel, so that the ejecta can flush the explosion-proof valve 520, causing the explosion-proof valve 520 to open, so that the ejecta can be discharged to the external environment in time.

[0072] In one embodiment, Figure 2 As shown, the bracket 200 includes a first support rod 210 and a second support rod 220; the first support rod 210 is arranged along the length direction of the substrate 100, and the second support rod 220 is arranged along the length direction of the substrate 100, and the first support rod 210 and the second support rod 220 are arranged at intervals.

[0073] The first support rod 210 and the second support rod 220 are disposed on the substrate 100 at intervals. For example, the first support rod 210 may be disposed adjacent to one side of the substrate 100 , and the second support rod 220 may be disposed adjacent to the other side of the substrate 100 .

[0074] Exemplarily, the substrate 100 is a rectangular substrate 100. By setting the first support rod 210 along the length direction of the substrate 100 and the second support rod 220 along the length direction of the substrate 100, the support strength of the substrate 100 is enhanced, thereby enhancing the support strength of the core package 500.

[0075] In one example, the distance between the substrate 100 and the battery bottom shell 510 ranges from 3 mm to 5 mm. For example, the thickness of the substrate 100 may be 2 mm, and the thickness of the spacer 300 may be 10 μm, which ensures the utilization space of the core pack 500 and increases the airflow path between the core pack 500 and the explosion-proof valve without reducing the battery energy density as much as possible.

[0076] In one embodiment, Figure 6 As shown, a battery is provided, including a core pack 500, a battery bottom shell 510 and a battery bottom support structure as described above; the battery bottom support structure is arranged on the battery bottom shell 510, and the core pack 500 is arranged on the battery bottom support structure.

[0077] For the specific description of the core pack 500, the battery bottom shell 510 and the battery bottom support structure, reference can be made to the specific description of the core pack 500, the battery bottom shell 510 and the battery bottom support structure in the above embodiments, which will not be repeated here.

[0078] Among them, the battery includes a battery shell, the battery bottom shell 510 is the bottom surface of the battery shell, the battery bottom shell 510 is provided with an explosion-proof valve 520, which is arranged on the battery bottom shell 510 through a battery bottom support structure, and the core pack 500 is arranged on the battery bottom support structure. The battery bottom support structure includes a substrate 100, a bracket 200 and an isolation member 300. The substrate 100 is used to support the core pack 500; the bracket 200 is arranged on the battery bottom shell 510, and the substrate 100 is arranged on the bracket 200. The substrate 100, the bracket 200 and the battery bottom shell 510 are surrounded to form a pressure relief channel 400; the isolation member 300 is arranged on the substrate 100, and the isolation member 300 is used to seal the substrate 100 to isolate the core pack 500 from the pressure relief channel 400. The ejecta generated by the thermal runaway of the core pack 500 can dissolve the isolation member 300, and then the ejecta can smoothly enter the pressure relief channel 400.

[0079] In the above embodiment, by improving the structure of the battery base, by setting a bracket 200 between the substrate 100 and the battery bottom shell 510, the gap between the core pack 500 and the battery bottom shell 510 is increased without reducing the battery energy density as much as possible, thereby increasing the air flow channel between the core pack 500 of the battery and the explosion-proof valve of the battery bottom shell 510; by setting the isolation member 300 on the substrate 100, when the core pack 500 has a thermal runaway, the ejecta generated by the thermal runaway of the core pack 500 can dissolve the isolation member 300, so that the core pack 500 and the pressure relief channel 400 are conductive, and then the ejecta can be ejected into the pressure relief channel 400, so that the explosion-proof valve 520 on the battery bottom shell 510 is opened smoothly, thereby isolating the high pressure and ejecta generated by the thermal runaway of the battery, and improving the opening smoothness of the explosion-proof valve when the battery has a thermal runaway.

[0080] In one embodiment, Figure 6 As shown, the battery further includes a pin 600 ; a pole ear 530 is disposed on the side of the core package 500 , and a pole 540 is disposed on the top surface of the core package 500 ; and the pin 600 is connected between the pole ear 530 and the pole 540 .

[0081] For example, the pole 540 includes a positive pole 540 and a negative pole 540 , the pin 600 includes a first pin 600 and a second pin 600 , and the tab 530 includes a first tab 530 and a second tab 530 .

[0082] A first pole ear 530 is provided on the first side of the core package 500, a second pole ear 530 is provided on the second side of the core package 500, and a positive pole column 540 and a negative pole column 540 are provided on the top surface of the core package 500; a first pin 600 is connected between the first pole ear 530 and the positive pole column 540, and a second pin 600 is connected between the second pole ear 530 and the positive pole column 540. The bottom surface of the core package 500 is laminated on the substrate 100, and the battery bottom shell 510 is provided with an explosion-proof valve 520. By arranging a battery bottom support structure between the core package 500 and the battery bottom shell 510, when thermal runaway occurs in the core package 500, The ejecta generated by the thermal runaway of the core package 500 can dissolve the isolation member 300, so that the first through hole area 110 on the substrate 100 is conductive, and then the ejecta can be ejected into the pressure relief channel 400, so that the explosion-proof valve 520 on the battery bottom shell 510 is opened smoothly, thereby isolating the high pressure and ejecta generated by the thermal runaway of the battery, and improving the smoothness of opening the explosion-proof valve when the battery is thermally runaway; in addition, there is no need to set the lower plastic on the top surface of the core package 500, so that the gap above the core package 500 can be compressed, thereby increasing the airflow path between the bottom surface of the core package 500 and the explosion-proof valve without reducing the battery energy density as much as possible.

[0083] It should be noted that the battery may also include components such as a BMS, and a specific battery system may include more components than those described in the above embodiments, or combine certain components, or have a different arrangement of components.

[0084] 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.

[0085] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A battery base structure, characterized in that: include: A base plate, the base plate is used to support the core package; A bracket, wherein the bracket is arranged on the battery bottom shell, the substrate is arranged on the bracket, and the substrate, the bracket and the battery bottom shell are surrounded to form a pressure relief channel; An isolating member is disposed on the substrate and is used to seal the substrate to isolate the core package from the pressure relief channel.

2. The battery base structure according to claim 1, characterized in that: The substrate is provided with a first through hole area; the isolation member is used to seal the first through hole area; When thermal runaway occurs in the core package, the first through hole area is connected to allow the first through hole area to communicate with the pressure relief channel.

3. The battery base structure according to claim 2, characterized in that: The substrate is also provided with a second through hole area; the isolation member is used to seal the second through hole area; When thermal runaway occurs in the core package, the second through hole area is connected to make the second through hole area communicate with the pressure relief channel.

4. The battery base structure according to claim 3, characterized in that: The second through-hole region includes a first through-hole sub-region and a second through-hole sub-region; The first through-hole region is located between the first through-hole sub-region and the second through-hole sub-region.

5. The battery base structure according to claim 4, characterized in that: The first through hole sub-region includes a plurality of first through holes, and the second through hole sub-region includes a plurality of second through holes; The size of the first through hole is equal to the size of the second through hole.

6. The battery base structure according to claim 5, characterized in that: The first through hole region includes a plurality of third through holes; The size of the third through hole is greater than that of the first through hole.

7. The battery base structure according to claim 6, characterized in that: The isolation member is located between the substrate and the bracket; The first through hole and the isolating member are combined to form a first groove, and the first groove is used to contain residual liquid in the battery; the second through hole and the isolating member are combined to form a second groove, and the second groove is used to contain residual liquid in the battery; the third through hole and the isolating member are combined to form a third groove, and the third groove is used to contain residual liquid in the battery.

8. The battery base structure according to claim 1, characterized in that: The bracket includes a first support rod and a second support rod; The first support rod is arranged along the length direction of the substrate, the second support rod is arranged along the length direction of the substrate, and the first support rod is spaced apart from the second support rod.

9. The battery base structure according to any one of claims 1 to 8, characterized in that: The distance between the substrate and the battery bottom shell ranges from 3 mm to 5 mm.

10. A battery, characterized in that: It comprises a core pack, a battery bottom shell and a battery bottom support structure as claimed in any one of claims 1 to 9; The battery bottom support structure is arranged on the battery bottom shell, and the core pack is arranged on the battery bottom support structure.

11. The battery according to claim 10, characterized in that It also includes pins; the side surface of the core package is provided with a pole ear, and the top surface of the core package is provided with a pole column; The pin is connected between the pole lug and the pole.

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