Lithium battery positioning structure

Abstract

The utility model belongs to the technical field of lithium batteries, and discloses a lithium battery positioning structure which comprises a ventilation valve, a first ventilation pad and a second ventilation pad, limiting grooves are formed in the two ends of the ventilation valve and used for containing a lithium battery, and the ventilation valve is provided with a ventilation hole arranged in a penetrating mode. The two ends of the air hole are matched with the two limiting grooves correspondingly. A ventilation valve element is installed in the middle of the ventilation hole to divide the ventilation hole into two parts, a ventilation groove extending in the radial direction of the ventilation valve is further formed in the ventilation valve, one end of the ventilation groove is communicated with the ventilation hole, and the first ventilation pad is matched with the limiting groove and used for shielding the ventilation hole. The second breathable pad is arranged on the breathable valve in a sleeving mode and used for shielding an opening, formed in the periphery of the breathable valve, of the limiting groove. According to the lithium battery positioning structure, the lithium battery can be well supported when a glue filling process is carried out, gas can be exhausted in time after thermal runaway of the lithium battery occurs, and the phenomenon of thermal runaway spreading is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a positioning structure for lithium batteries. Background Art

[0002] As a common type of lithium battery, with the increasing application range of lithium batteries, higher requirements are imposed on the safety requirements, environmental adaptability, mechanical strength, electrical performance, chemical stability and aging resistance of lithium batteries. To meet these requirements, a potting process is usually adopted to protect lithium batteries, that is, the lithium batteries are placed in glue for treatment, and the cured glue forms a positioning structure outside the lithium batteries. When there are multiple lithium batteries, a lithium battery positioning structure is usually required to fix the multiple lithium batteries together as required and then perform potting. After potting, although the waterproof performance of the lithium batteries can be improved and the impact resistance of the lithium batteries can be enhanced, when thermal runaway occurs in the lithium batteries, the gas cannot be discharged in time, resulting in the spread of thermal runaway. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a positioning structure for lithium batteries, which can better support lithium batteries during the potting process and can discharge gas in time after thermal runaway occurs in the lithium batteries, avoiding the occurrence of the spread of thermal runaway.

[0004] To achieve this purpose, the utility model adopts the following technical solutions:

[0005] The utility model discloses a positioning structure for lithium batteries, comprising: a breather valve, both ends of the breather valve are formed with limiting grooves for accommodating lithium batteries, the breather valve has a through breather hole, and both ends of the breather hole are respectively matched with the two limiting grooves; a breather valve core is installed in the middle of the breather hole to divide the breather hole into two parts, and the breather valve is also provided with a breather groove extending along its radial direction, and one end of the breather groove is communicated with the breather hole; a first breather pad, the first breather pad is matched with the limiting groove and used for blocking the breather hole; a second breather pad, the second breather pad is sleeved on the breather valve and used for blocking the opening formed by the limiting groove on the outer periphery of the breather valve.

[0006] In some embodiments, the breather valve includes a pair of breather tiles arranged in pairs, both of the pair of breather tiles are provided with breather sub-holes, and the two breather sub-holes are communicated to form the breather hole; wherein: the breather valve core is located on the joint surface of the two breather tiles, and the joint surface of the two breather tiles is provided with the breather groove.

[0007] In some specific embodiments, among the two surfaces of the two ventilation tiles facing each other, a positioning protrusion is provided on one surface, and a positioning groove is provided on the other surface, and the positioning protrusion can be inserted into the positioning groove.

[0008] In some more specific embodiments, both the positioning protrusion and the positioning groove are multiple, the multiple positioning protrusions and the multiple positioning grooves are arranged in one-to-one correspondence, and the multiple positioning protrusions are arranged at intervals along the circumferential direction of the ventilation hole.

[0009] In some specific embodiments, ventilation half-grooves are provided on the surfaces of the two ventilation tiles facing each other, and the two ventilation half-grooves form the ventilation groove.

[0010] In some embodiments, there are multiple ventilation grooves, and the multiple ventilation grooves are distributed at intervals along the circumferential direction of the ventilation hole.

[0011] In some embodiments, the limiting groove includes a first groove and a second groove, a stepped surface is formed at the junction of the first groove and the second groove, the stepped surface is used to support the lithium battery, the ventilation hole is formed on the bottom wall of the second groove, and the first ventilation pad is installed in the second groove.

[0012] In some embodiments, the lithium battery positioning structure further includes a seal, the seals are provided in pairs, and the two seals provided in pairs are respectively connected to two ends of the ventilation valve along its axial direction, and the inner peripheral wall of each seal abuts against the outer peripheral wall of the lithium battery.

[0013] In some specific embodiments, a limiting protrusion is provided on one of the seal and the ventilation valve, and a limiting groove is provided on the other of the seal and the ventilation valve, and the limiting protrusion can be inserted into the limiting groove.

[0014] In some more specific embodiments, the limiting protrusion is formed as an annular protrusion extending along the circumferential direction of the seal, and the limiting groove is formed as an annular groove extending along the circumferential direction of the seal.

[0015] Beneficial effects of the lithium battery positioning structure of the present utility model: During the actual working process, first install the first ventilation pad and the second ventilation pad onto the ventilation valve, and then insert the two lithium batteries into the limiting grooves at both ends of the ventilation valve respectively. The limiting grooves can stably limit the lithium batteries, achieving stable fixation of the lithium batteries. Then, place the entire structure into glue for glue filling treatment. Due to the presence of the first ventilation pad and the second ventilation pad, the glue will not enter the ventilation holes and ventilation grooves. If one of the lithium batteries undergoes thermal runaway, the gas generated by the thermal runaway can enter the ventilation holes and push the ventilation valve core to move, causing the gas to diffuse outward from the ventilation grooves. Since the thickness of the glue layer formed at the position of the second ventilation pad is relatively thinner than other positions, the high-temperature gas can melt the glue layer and then discharge it, thereby avoiding the occurrence of lithium battery thermal runaway. Thus, by sharing one ventilation valve for two lithium batteries, it can not only support the lithium batteries well during the glue filling process, but also discharge the gas in a timely manner after the lithium batteries experience thermal runaway, avoiding the spread of thermal runaway.

[0016] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present utility model. Brief Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of the lithium battery positioning structure of the present utility model;

[0018] Figure 2 is an exploded structural diagram of the lithium battery positioning structure of the present utility model;

[0019] Figure 3 is a schematic diagram of the mating structure between the lithium battery positioning structure of the present utility model and the lithium battery;

[0020] Figure 4 is a cross-sectional view of the mating structure between the lithium battery positioning structure of the present utility model and the lithium battery.

[0021] Reference Signs:

[0022] 100, ventilation valve; 110, ventilation tile; 111, positioning protrusion; 112, positioning groove; 120, ventilation valve core; 101, limiting groove; 1011, first groove; 1012, second groove; 102, limiting convex; 103, ventilation sub-hole; 104, ventilation semi-groove;

[0023] 200, first ventilation pad;

[0024] 300, second ventilation pad;

[0025] 400, seal; 410, limiting groove. Detailed Embodiment

[0026] The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0027] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0028] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0029] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0030] The present utility model discloses a lithium battery positioning structure. Refer to Figures 1-3As shown in the figure, the lithium battery positioning structure of this embodiment includes a ventilation valve 100, a first ventilation pad 200, and a second ventilation pad 300. Limited position grooves 101 are formed at both ends of the ventilation valve 100. The limited position grooves 101 are used to accommodate the lithium battery 10. The ventilation valve 100 has a ventilation hole penetrating through it, and both ends of the ventilation hole are respectively matched with the two limited position grooves 101. A ventilation valve core 120 is installed in the middle of the ventilation hole to divide the ventilation hole into two parts. The ventilation valve 100 is also provided with a ventilation groove extending along its radial direction, and one end of the ventilation groove is communicated with the ventilation hole. The first ventilation pad 200 is matched with the limited position groove 101 and is used to block the ventilation hole. The second ventilation pad 300 is sleeved on the ventilation valve 100 and is used to block the opening formed by the limited position groove 101 on the outer periphery of the ventilation valve 100. It can be understood that during the actual working process, the first ventilation pad 200 and the second ventilation pad 300 are first installed on the ventilation valve 100, and then the two lithium batteries 10 are respectively inserted into the limited position grooves 101 at both ends of the ventilation valve 100. The limited position grooves 101 can stably limit the lithium battery 10 to achieve stable fixation of the lithium battery 10, and then the entire structure is placed in glue for potting treatment. Due to the presence of the first ventilation pad 200 and the second ventilation pad 300, the glue will not enter the ventilation hole and the ventilation groove. If one of the lithium batteries 10 undergoes thermal runaway, the gas generated by the thermal runaway can enter the ventilation hole and push the ventilation valve core 120 to move, so that the gas diffuses outwards from the ventilation groove. Since the thickness of the glue layer formed at the position of the second ventilation pad 300 is relatively thinner than other positions, the high-temperature gas can melt the glue layer and then discharge it, thereby avoiding the occurrence of thermal runaway of the lithium battery 10. Thus, by sharing one ventilation valve 100 for two lithium batteries 10, it can not only better support the lithium battery 10 during the potting process, but also discharge the gas in time after the lithium battery 10 undergoes thermal runaway, avoiding the spread of thermal runaway.

[0031] Reference Figure 2As shown, the breather valve 100 includes a pair of breather tiles 110 arranged in pairs. Each of the two breather tiles 110 arranged in pairs is provided with a breather sub-hole 103, and the two breather sub-holes 103 communicate with each other to form a breather hole. Among them: The breather valve core 120 is located on the joint surface of the two breather tiles 110, and a breather groove is provided on the joint surface of the two breather tiles 110. It can be understood that compared with the integrally formed breather valve 100, the breather valve 100 in this embodiment is split into two breather tiles 110, which can reduce the manufacturing process ability of the breather valve 100, simplify the manufacturing difficulty of the breather valve 100, and thus reduce the manufacturing cost of the breather valve 100. Since the breather valve core 120 is located on the joint surface of the two breather tiles 110, and a breather groove is provided on the joint surface of the two breather tiles 110, during the actual working process, if one of the lithium batteries 10 undergoes thermal runaway, the gas generated by the thermal runaway can enter one breather sub-hole 103 and push the breather valve core 120 to move to block the other breather sub-hole 103, so that the gas diffuses outwards from the breather groove. In this way, the structure in which the two breather sub-holes 103 form a breather hole is beneficial to improving the performance of the lithium battery positioning structure to prevent the spread of thermal runaway. The provision of a breather groove on the joint surface of the two breather tiles 110 is beneficial to gas discharge, thereby further improving the performance of the lithium battery positioning structure to prevent the spread of thermal runaway.

[0032] Optionally, among the two surfaces of the two breather tiles 110 facing each other, a positioning protrusion 111 is provided on one surface, and a positioning groove 112 is provided on the other surface. The positioning protrusion 111 can be inserted into the positioning groove 112. It can be understood that during the actual assembly process, the breather valve core 120 is installed on one breather tile 110, and then the other breather tile 110 is docked to the breather tile 110 on which the breather valve core 120 is installed, and during the docking process, it is ensured that the positioning protrusion 111 is inserted into the positioning groove 112. On the one hand, it can improve the connection stability of the two breather tiles 110, prevent the breather valve core 120 from disengaging from the breather groove, and on the other hand, it can prevent the two breather tiles 110 from rotating relative to each other, facilitating the connection of the two breather tiles 110.

[0033] Optionally, both the positioning protrusion 111 and the positioning groove 112 are multiple. The multiple positioning protrusions 111 and the multiple positioning grooves 112 are arranged in one-to-one correspondence, and the multiple positioning protrusions 111 are arranged at intervals along the circumferential direction of the breather hole. It can be understood that by docking the two breather tiles 110 through the multiple positioning protrusions 111 and the positioning grooves 112, the connection stability of the two breather tiles 110 can be further improved.

[0034] Optionally, the positioning protrusion 111 is a truncated cone column, and the positioning groove 112 is a round hole. Thus, during the actual docking process, after the truncated cone column is inserted into the round hole, the connection stability of the two air-permeable tiles 110 can be further improved. Of course, in other embodiments of the present invention, parameters such as the shape, quantity, and arrangement mode of the positioning protrusion 111 and the positioning groove 112 can be selected according to actual needs, and are not limited to the foregoing limitations.

[0035] Reference Figure 2 As shown, air-permeable half-grooves 104 are provided on the surfaces of the two air-permeable tiles 110 facing each other, and the two air-permeable half-grooves 104 form an air-permeable groove. It can be understood that, compared with only providing an air-permeable groove on one air-permeable tile 110, the two air-permeable half-grooves 104 form an air-permeable groove. No matter which lithium battery 10 has a thermal runaway problem, the gas can be stably discharged, thereby further improving the performance of the lithium battery positioning structure in preventing the spread of thermal runaway. Optionally, the air-permeable half-groove 104 is a semi-circular groove, and the air-permeable groove is a circular hole. Thus, it is convenient for the processing of the air-permeable half-groove 104. Of course, in other embodiments of the present invention, the shape of the air-permeable half-groove 104 can also be selected according to actual needs.

[0036] Optionally, there are multiple air-permeable grooves, and the multiple air-permeable grooves are circumferentially spaced along the circumference of the air-permeable hole. It can be understood that there are multiple air-permeable grooves and they are circumferentially spaced along the circumference of the air-permeable hole. When the lithium battery 10 has a thermal runaway, the gas can enter the multiple air-permeable grooves from multiple directions, which is beneficial to improving the gas discharge speed, thereby further improving the performance of the lithium battery positioning structure in preventing the spread of thermal runaway.

[0037] Reference Figure 2 And Figure 4 As shown, the limiting groove 101 includes a first groove 1011 and a second groove 1012. The junction of the first groove 1011 and the second groove 1012 forms a stepped surface, and the stepped surface is used to support the lithium battery 10. The air-permeable hole is formed on the bottom wall of the second groove 1012, and the first air cushion 200 is installed in the second groove 1012. It can be understood that the limiting groove 101 includes the first groove 1011 and the second groove 1012. After the lithium battery 10 is installed on the air-permeable valve 100, the second groove 1012 forms a space, and this space can be used to accommodate the gas generated by the thermal runaway of the lithium battery 10, playing a buffering role, thereby being beneficial to reducing the severity of the thermal runaway of the lithium battery 10.

[0038] Reference Figure 2 And Figure 4As shown, the lithium battery positioning structure further includes a seal 400. The seals 400 are arranged in pairs, and the two seals 400 arranged in pairs are respectively connected to both axial ends of the breather valve 100 along its axis. The inner peripheral wall of each seal 400 abuts against the outer peripheral wall of the lithium battery 10. It can be understood that the seals 400 arranged in pairs are stuck at both axial ends of the breather valve 100 and abut against the outer circular contour of the outer peripheral wall of the lithium battery 10, reducing the gap between the contact surfaces of the lithium battery 10 and the breather valve 100, realizing the sealed connection between the lithium battery 10 and the breather valve 100, and preventing glue from entering the limit groove 101 through the gap between the lithium battery 10 and the peripheral wall of the limit groove 101 during the glue filling process. Optionally, the designed inner diameter of the seal 400 is smaller than the outer diameter of the lithium battery 10, enabling the seal 400 to be in a tight fit with the lithium battery 10, which is beneficial to improving the installation stability of the lithium battery 10.

[0039] Optionally, referring to Figure 4 As shown, a limit protrusion 102 is provided on one of the breather valves 100, and the seal 400 is provided with a limit groove 410. The limit protrusion 102 can be inserted into the limit groove 410. It can be understood that the connection stability between the breather valve 100 and the seal 400 can be improved through the cooperation of the limit protrusion 102 and the limit groove 410, thereby enhancing the connection sealing performance between the lithium battery 10 and the breather valve 100.

[0040] Further optionally, the limit protrusion 102 is formed as an annular protrusion extending along the circumferential direction of the seal 400, and the limit groove 410 is formed as an annular groove extending along the circumferential direction of the seal 400. It can be understood that through the cooperation of the annular protrusion and the annular groove, on the one hand, the connection stability between the breather valve 100 and the seal 400 can be improved, and on the other hand, the sealing performance of the lithium battery 10 along the circumferential direction can be ensured, thereby preventing glue from entering the limit groove 410 through the gap between the lithium battery 10 and the peripheral wall of the limit groove 410 during the glue filling process. Of course, in other embodiments of the present invention, the limit protrusion 102 can also be formed on the seal 400, and the limit groove 410 can also be formed on the breather valve 100. The shapes of the limit protrusion 102 and the limit groove 410 can be adjusted according to actual needs.

[0041] In the description of this specification, the descriptions referring to terms such as "some embodiments", "other embodiments", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0042] Obviously, the above-mentioned embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A lithium battery positioning structure, characterized in that, Comprising: A breather valve (100), with limiting grooves (101) formed at both ends of the breather valve (100), the limiting grooves (101) being used to accommodate a lithium battery (10), the breather valve (100) having a through breather hole, and both ends of the breather hole being respectively in cooperation with the two limiting grooves (101); a breather valve core (120) is installed in the middle of the breather hole to divide the breather hole into two parts, and the breather valve (100) is further provided with a breather groove extending radially along it, and one end of the breather groove is communicated with the breather hole; A first breather pad (200), the first breather pad (200) being fitted in the limiting groove (101) and used to block the breather hole; A second breather pad (300), the second breather pad (300) being sleeved on the breather valve (100) and used to block the opening formed by the limiting groove (101) on the outer periphery of the breather valve (100).

2. The lithium battery positioning structure according to claim 1, wherein The breather valve (100) includes paired breather tiles (110), and breather sub-holes (103) are provided on both of the paired breather tiles (110), and the two breather sub-holes (103) are communicated to form the breather hole; wherein: The breather valve core (120) is located on the joint surface of the two breather tiles (110), and the breather groove is provided on the joint surface of the two breather tiles (110).

3. The lithium battery positioning structure according to claim 2, characterized in that, Of the two surfaces of the two breather tiles (110) facing each other, a positioning protrusion (111) is provided on one surface, and a positioning groove (112) is provided on the other surface, and the positioning protrusion (111) can be inserted into the positioning groove (112).

4. The lithium battery positioning structure according to claim 3, wherein, Both the positioning protrusion (111) and the positioning groove (112) are multiple, the multiple positioning protrusions (111) and the multiple positioning grooves (112) are arranged in one-to-one correspondence, and the multiple positioning protrusions (111) are arranged at intervals around the circumference of the breather hole.

5. The lithium battery positioning structure according to claim 2, wherein, Both the surfaces of the two breather tiles (110) facing each other are provided with breather semi-grooves (104), and the two breather semi-grooves (104) form the breather groove.

6. The lithium battery positioning structure according to any one of claims 1-5, characterized in that, The breather grooves are multiple, and the multiple breather grooves are distributed at intervals along the circumference of the breather hole.

7. The lithium battery positioning structure according to any one of claims 1-5, characterized in that, The limiting groove (101) includes a first groove (1011) and a second groove (1012), and the junction of the first groove (1011) and the second groove (1012) forms a step surface, the step surface being used to support the lithium battery (10), the breather hole being formed on the bottom wall of the second groove (1012), and the first breather pad (200) being installed in the second groove (1012).

8. The lithium battery positioning structure according to any one of claims 1-5, characterized in that The lithium battery positioning structure further includes sealing members (400), the sealing members (400) being paired, and the two paired sealing members (400) are respectively connected to both ends of the breather valve (100) along its axial direction, and the inner peripheral wall of each sealing member (400) abuts against the outer peripheral wall of the lithium battery (10).

9. The lithium battery positioning structure according to claim 8, wherein, A limiting convex (102) is provided on one of the seal (400) and the breather valve (100), and a limiting groove (410) is provided on the other of the seal (400) and the breather valve (100), and the limiting convex (102) can be inserted into the limiting groove (410).

10. The lithium battery positioning structure according to claim 9, wherein The limiting convex (102) is formed as an annular convex extending along the circumferential direction of the seal (400), and the limiting groove (410) is formed as an annular groove extending along the circumferential direction of the seal (400).

Images