Battery with bottom explosion-proof valve and battery module

Abstract

The utility model relates to lithium battery technical field and propose a kind of battery of bottom explosion-proof valve, comprising: shell;Explosion-proof valve, set in the bottom of the shell;Roll core, set in the shell;At least two supporting members, along the length direction interval of the shell Set in the bottom of the shell, and distribute in the both sides of the explosion-proof valve, the at least two supporting members resist in the bottom of the roll core, the at least two supporting members close to the side of the explosion-proof valve have air guide channel, wherein, corresponding air guide channel continuously links the gap of adjacent two supporting members with the explosion-proof valve.In the utility model, the side of supporting member close to explosion-proof valve is also provided with air guide channel, air guide channel can continuously link the gap of two supporting members with explosion-proof valve, even if roll core appears thermal runaway, interval supporting member can also ensure that high-pressure gas generated by roll core is discharged outward by explosion-proof valve, to avoid the condition of battery explosion.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to a battery and battery module with a bottom explosion-proof valve. Background Technology

[0002] In lithium-ion battery structural design, some batteries adopt a "top terminal post + bottom explosion-proof valve" layout, while others adopt a "top terminal post + top explosion-proof valve" layout. Separating the terminal post and explosion-proof valve avoids structural interference between the two. Furthermore, placing the explosion-proof valve at the bottom allows for a larger valve area, improving battery safety performance.

[0003] CN220873778U discloses a battery and battery device. An insulating component with a pressure relief channel is placed between the battery cell and the casing. This channel connects the battery cell body and the explosion-proof valve in the event of thermal runaway, avoiding the problem of the battery cell clogging the explosion-proof valve and improving battery safety. However, for some wound batteries, because the recessed direction of the insulating component faces the battery cell, in the event of thermal runaway of the wound battery cell, the collapsed core can easily directly cover the exhaust channel of the bottom explosion-proof valve, causing blockage. This leads to a rapid increase in internal battery pressure within a short period, potentially triggering an explosion and threatening the entire battery pack.

[0004] Therefore, a battery and battery module with a bottom explosion-proof valve are proposed to solve the technical problem that existing technical solutions cannot prevent the core from clogging the explosion-proof valve, thereby improving the safety performance of the battery. Utility Model Content

[0005] In view of this, this utility model proposes a battery and battery module with a bottom explosion-proof valve, which can avoid the phenomenon of blockage of the explosion-proof valve when the wound battery cell is thermally runaway, ensure the normal pressure relief and exhaust of the explosion-proof valve, and improve the safety performance of the battery.

[0006] This utility model proposes a battery with a bottom explosion-proof valve, comprising: shell; An explosion-proof valve is located at the bottom of the housing; The core is disposed within the housing; At least two support members are spaced apart at the bottom of the housing along the length of the housing and distributed on both sides of the explosion-proof valve. The at least two support members abut against the bottom of the core. The at least two support members have air guiding channels on the side near the explosion-proof valve. The corresponding air guiding channels continuously connect the gap between two adjacent support members and the explosion-proof valve.

[0007] Based on the above technical solution, preferably, in the length direction of the outer shell, the distance from one end of the explosion-proof valve to one side of the outer shell is L, the number of the support members is N, and the width of the support member is L / N.

[0008] Based on the above technical solution, preferably, the support members located on one side of the explosion-proof valve are distributed at equal intervals.

[0009] Based on the above technical solution, preferably, each of the at least two support members has a gas guide groove through it on the side near the outer shell, the width of the gas guide groove is adapted to the width of the explosion-proof valve, and the gas guide groove serves as the gas guide channel.

[0010] Based on the above technical solution, preferably, each of the at least two support members is provided with a secondary groove in the air guide groove, and the opening of the secondary groove faces the explosion-proof valve.

[0011] Based on the above technical solution, preferably, the depth of the air guide groove is greater than 1 mm.

[0012] Based on the above technical solution, preferably, the height of the outer shell is H, and the height of the support member is in the range of 1 / 6H-1 / 3H.

[0013] Based on the above technical solution, preferably, the outer casing includes: The housing is hollow inside, forming a receiving space for installing the explosion-proof valve, the winding core, and the at least two support members; A bottom cover is disposed at the opening of the housing and is used to seal the housing. At least two support members are disposed on the bottom cover, and the length of the support members is adapted to the width of the bottom cover.

[0014] Based on the above technical solution, preferably, the at least two support members are integrally formed with the bottom cover.

[0015] On the other hand, this utility model also provides a battery module, which is equipped with a plurality of batteries as described above with bottom explosion-proof valves.

[0016] The three-dimensional intersection measurement method provided by this utility model has the following advantages compared with the prior art: 1. The support members are spaced apart at the bottom of the shell and support the bottom of the core. A gap is formed between two adjacent support members to provide ventilation space at the bottom of the core. In addition, a venting channel is provided on the side of the support member near the explosion-proof valve. The venting channel can continuously connect the gap between the two support members and the explosion-proof valve. Even if the core experiences thermal runaway, the spaced support members can ensure that the high-pressure gas generated by the core is discharged to the outside through the explosion-proof valve, thereby avoiding the battery from exploding. 2. Since a secondary groove is further provided on the air guide groove, and the secondary groove is at the top of the air guide groove, the depth of the air guide groove can be further increased, thereby further increasing the width of the air guide channel and more effectively guiding the airflow to the exhaust valve. 3. Limiting the height of the support component can limit the space between the core and the explosion-proof valve, ensuring sufficient pressure relief space between the core and the explosion-proof valve and preventing the core from clogging the explosion-proof valve. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a front sectional view of a battery with a bottom explosion-proof valve according to the present invention; Figure 2 This is a perspective view of the battery bottom cover and support component of a bottom explosion-proof valve according to this utility model; Figure 3 This is a front sectional view of another embodiment of the battery with a bottom explosion-proof valve according to the present invention; Figure 4 This is a front sectional view of another embodiment of the battery with a bottom explosion-proof valve according to the present invention.

[0019] Explanation of reference numerals in the attached drawings: 1. Outer shell; 11. Housing; 12. Bottom cover; 2. Explosion-proof valve; 3. Core; 4. Support component; 401. Air guide channel; 402. Secondary channel; 5. Pole post. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0022] In the description of the embodiments of this utility model, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0025] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0026] The technical solution is explained below. Because the recessed direction of the insulating component faces the battery cell, specifically targeting some wound battery cells, and in the event of thermal runaway of a wound cell, the collapsed core can easily directly cover the venting channel of the bottom explosion-proof valve, causing blockage. This leads to a rapid increase in internal battery pressure within a short period, potentially triggering an explosion and threatening the entire battery pack. Therefore, if... Figure 1 As shown, this utility model provides a battery with a bottom explosion-proof valve, comprising: Outer shell 1; Explosion-proof valve 2 is located at the bottom of housing 1; Core 3 is disposed inside outer casing 1; At least two support members 4 are spaced apart at the bottom of the outer shell 1 along the length direction of the outer shell 1 and distributed on both sides of the explosion-proof valve 2. At least two support members 4 abut against the bottom of the core 3. At least two support members 4 have air guiding channels on the side near the explosion-proof valve 2. The corresponding air guiding channels are continuously connected to the gap between two adjacent support members 4 and the explosion-proof valve 2.

[0027] Support members 4 are spaced apart at the bottom of the outer casing 1 and support the bottom of the core 3. A gap is formed between two adjacent support members 4, so that there is an exhaust space at the bottom of the core 3. In addition, a gas guide channel is provided on the side of the support member 4 near the explosion-proof valve 2. The gas guide channel can continuously connect the gap between the two support members 3 and the explosion-proof valve 2. Even if the core 3 experiences thermal runaway, the spaced support members 4 can ensure that the high-pressure gas generated by the core 3 is discharged to the outside through the explosion-proof valve 2, thereby avoiding the battery from exploding.

[0028] like Figure 2 As shown, in order to ensure that the support member 4 effectively supports the core 3 and that the support member 4 can form a stable air guiding channel, the distance from one end of the explosion-proof valve 2 to one side of the shell 1 in the length direction of the shell 1 is L, the number of support members 4 is N, and the width of the support member 4 is L / N.

[0029] The width of the support member 4 is limited here to ensure that there is sufficient space between two adjacent support members 4 to form a gap, and also to ensure the support strength of the support member 4 in supporting the core 3.

[0030] The support members 4 located on one side of the explosion-proof valve 2 are evenly distributed.

[0031] like Figure 2 As shown, there are four support members 4, and the support members 4 on one side of the explosion-proof valve 2 are evenly distributed. The width of each support member 4 is L / 4. Correspondingly, the gap between two adjacent support members 4 is also L / 4, ensuring that a gap is formed between two adjacent support members 4. The evenly spaced support members 4 can also effectively support the core 3.

[0032] like Figure 2As shown, in order to stably guide the airflow through the air guide channel, at least two support members 4 are provided with air guide grooves 401 through one side near the outer shell 1. The width of the air guide grooves 401 is adapted to the width of the explosion-proof valve 2, and the air guide grooves 401 serve as air guide channels.

[0033] An air guide groove 401 is provided on the side of the support member 4 near the outer shell 1, and the air guide groove 401 is located in the middle of the support member 4, so that both ends of the support member 4 are connected to the outer shell 1. This can ensure the stability of the air guide channel, and the support member 4 can also effectively support the core 3.

[0034] like Figure 2 As shown, in order to ensure that the air duct smoothly guides the airflow, at least two support members 4 are provided with secondary grooves 402 in the air duct 401, and the openings of the secondary grooves 402 face the explosion-proof valve 2.

[0035] Since a secondary groove 402 is further provided on the air guide groove 401, and the secondary groove 402 is at the top of the air guide groove 401, the depth of the air guide groove 401 can be further increased, thereby further increasing the width of the air guide channel and more effectively guiding the airflow to the exhaust valve.

[0036] like Figure 2 As shown, in order to smoothly guide the airflow in the explosion gas channel, the depth of the gas guide groove 401 is limited, and the depth of the gas guide groove 401 is greater than 1 mm.

[0037] The depth of the air guide groove 401 is greater than 1mm, which ensures that there is sufficient pressure relief and air guide space between the support 4 and the explosion-proof valve 2, and can prevent the core 3 from blocking the explosion-proof valve 2.

[0038] like Figure 2 As shown, in order to ensure that the core 3 does not block the explosion-proof valve 2, the height of the outer shell 1 is H, and the height of the support 4 is in the range of 1 / 6H-1 / 3H.

[0039] By limiting the height of the support member 4, the space between the core 3 and the explosion-proof valve 2 can be limited, so that there is sufficient pressure relief space between the core 3 and the explosion-proof valve 2, and the core 3 can be prevented from blocking the explosion-proof valve 2.

[0040] like Figure 2 As shown, the outer shell 1 is a split structure, and the outer shell 1 includes: The housing 11 is hollow inside, forming a space for installing the explosion-proof valve 2, the core 3 and at least two support members 4; A bottom cover 12 is disposed at the opening of the housing 11 and is used to seal the housing 11. At least two support members 4 are disposed on the bottom cover 12, and the length of the support members 4 is adapted to the width of the bottom cover 12.

[0041] The housing 11 forms a receiving space to accommodate the explosion-proof valve 2, the core 3, and at least two support members 4. The bottom cover 12 seals the opening of the housing 11 and encloses the explosion-proof valve 2, the core 3, and the support members 4 within the receiving space. The explosion-proof valve 2 and the support members 4 are mounted on the bottom cover 12, and the length of the support members 4 is adapted to the width of the bottom cover 12, so that the support members 4 can provide overall support to the bottom of the core 3, ensuring that the support members 4 provide effective support to the core 3.

[0042] At least two support members 4 are integrally formed with the bottom cover 12.

[0043] Specifically, the support component 4 is made of aluminum and is integrally stamped with the bottom cover 12, which can effectively improve the mechanical properties of the support component 4. In the case of thermal runaway of the core 3, the aluminum support component 4 has a high melting point and is not easy to melt and deform when heated. It can continuously maintain the space between the core 3 and the explosion-proof valve 2, unlike ordinary plastic parts that are easy to block the explosion-proof valve after melting, so as to ensure that the gas passage is unobstructed and improve the thermal runaway safety performance of the battery.

[0044] The working principle of the bottom explosion-proof valve is that the bottom of the core 3 is supported by the spaced support members 4. A gap is formed between two adjacent support members 4, and an air guide channel is also provided on the support member 4. Through the gap of the support member 4 and the air guide channel, the connection between the core 3 and the explosion-proof valve 2 can always be ensured, and the high pressure gas generated by the thermal runaway of the core 3 can be discharged to the outside through the explosion-proof valve 2.

[0045] like Figure 1 As shown, the battery with the bottom explosion-proof valve also includes a terminal post 5, which is located on the side of the outer casing 11 away from the bottom cover 12 and connected to the core 3. That is, the terminal post 5 is located on the top of the outer casing 11, ensuring that there is enough space between the core 3 and the explosion-proof valve 2, and that the structures of the terminal post 5 and the explosion-proof valve 2 will not interfere with each other.

[0046] like Figure 3 As shown, in another embodiment of the present invention, there are two support members 4, which are respectively arranged on both sides of the explosion-proof valve 2. The two support members 4 are used to support the core 3 to ensure that there is a sufficient exhaust gap between the core 3 and the explosion-proof valve 2.

[0047] like Figure 4 As shown, based on the previous embodiment, a portion of the core 3 contacts the support member 4, and another portion of the core 3 directly abuts against the bottom cover 12. In this way, the energy density inside the battery can be increased, and the core 3 can be stably fixed.

[0048] On the other hand, this utility model also provides a battery module, on which a plurality of batteries with the aforementioned bottom explosion-proof valves are configured.

[0049] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A battery with a bottom explosion-proof valve, characterized in that, include: Outer shell (1); An explosion-proof valve (2) is disposed at the bottom of the housing (1); The core (3) is disposed inside the outer casing (1); At least two support members (4) are spaced apart at the bottom of the outer shell (1) along the length direction of the outer shell (1) and distributed on both sides of the explosion-proof valve (2). The at least two support members (4) abut against the bottom of the core (3). The at least two support members (4) have air guiding channels on the side near the explosion-proof valve (2). The corresponding air guiding channels continuously connect the gap between two adjacent support members (4) and the explosion-proof valve (2).

2. The battery with the bottom explosion-proof valve as described in claim 1, characterized in that, Along the length of the outer casing (1), the distance from one end of the explosion-proof valve (2) to one side of the outer casing (1) is L, the number of the support members (4) is N, and the width of the support member (4) is L / N.

3. The battery with the bottom explosion-proof valve as described in claim 2, characterized in that, The support members (4) located on one side of the explosion-proof valve (2) are evenly distributed.

4. The battery with the bottom explosion-proof valve as described in claim 1, characterized in that, The at least two support members (4) are provided with air guide grooves (401) through one side near the outer shell (1). The width of the air guide grooves (401) is adapted to the width of the explosion-proof valve (2). The air guide grooves (401) serve as the air guide channels.

5. The battery with the bottom explosion-proof valve as described in claim 4, characterized in that, The at least two support members (4) are provided with secondary grooves (402) in the air guide groove (401), and the openings of the secondary grooves (402) face the explosion-proof valve (2).

6. The battery with the bottom explosion-proof valve as described in claim 4, characterized in that, The depth of the air guide groove (401) is greater than 1 mm.

7. The battery with the bottom explosion-proof valve as described in claim 1, characterized in that, The height of the outer shell (1) is H, and the height of the support member (4) is in the range of 1 / 6H-1 / 3H.

8. The battery with the bottom explosion-proof valve as described in claim 1, characterized in that, The outer casing (1) includes: The housing (11) is hollow inside and forms a space for installing the explosion-proof valve (2), the core (3) and the at least two support members (4); A bottom cover (12) is disposed at the opening of the housing (11) and is used to seal the housing (11). At least two support members (4) are disposed on the bottom cover (12), and the length of the support member (4) is adapted to the width of the bottom cover (12).

9. The battery with the bottom explosion-proof valve as described in claim 8, characterized in that, The at least two support members (4) are integrally formed with the bottom cover (12).

10. A battery module, characterized in that, The battery module is equipped with a plurality of batteries having bottom explosion-proof valves as described in any one of claims 1-9.

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