Single battery and battery pack

Abstract

The utility model discloses a single battery and a battery pack, the single battery comprises a shell, an explosion-proof valve, a limiting piece, a battery cell and an exhaust piece, the limiting piece is arranged in an inner cavity of the shell and connected with the inner wall of the shell, the limiting piece divides the inner cavity into a battery cell cavity and an exhaust cavity which are communicated with each other, and the exhaust cavity is located between the battery cell cavity and the explosion-proof valve; the exhaust part is contained in the exhaust cavity and limited in the exhaust cavity by the limiting part. According to the single battery provided by the invention, the problem that the exhaust part rubs the shell when the battery cell enters the shell is solved, and the assembly efficiency of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a single cell and a battery pack. Background Art

[0002] In existing power batteries, when the battery pack shakes or is hit, the cells in the single battery will move in the shell. During the movement, the cells are likely to collide with the shell, causing the explosion-proof valve on the shell to be blocked by the cells, affecting the smoothness of the explosion-proof valve exhaust. Therefore, an exhaust bracket needs to be set between the shell and the winding core. The conventional solution is to set the exhaust bracket and the winding core as one or stick it on the winding core before putting it into the shell. However, when the winding core is put into the shell, the exhaust bracket and the shell are easily scratched, which may cause the cell to fail and greatly affect the assembly efficiency of the process. Utility Model Content

[0003] The utility model provides a single battery, which solves the problem that the exhaust component scrapes the shell when the battery core is put into the shell, and improves the assembly efficiency of the battery.

[0004] A first aspect of an embodiment of the present application provides a single cell battery, comprising: a shell having an inner cavity, the shell being provided with an explosion-proof hole; an explosion-proof valve connected to the shell and closing the explosion-proof hole; a limiting member arranged in the inner cavity and connected to the inner wall of the shell, the inner cavity being divided by the limiting member into a connected battery cell cavity and an exhaust cavity, wherein the exhaust cavity is located between the battery cell cavity and the explosion-proof valve; a battery cell accommodated in the battery cell cavity; and an exhaust member accommodated in the exhaust cavity and restricted in the exhaust cavity by the limiting member; wherein the exhaust member has an exhaust channel penetrating the exhaust member along the thickness direction thereof, the exhaust channel being constructed to be fluidically connected to the explosion-proof valve, the limiting member having a guide channel penetrating from the battery cell cavity to the exhaust channel, the battery cell cavity and the exhaust channel being fluidically connected to each other through the guide channel.

[0005] Optionally, the single battery has a height direction, the explosion-proof valve, the exhaust member and the limit member are arranged along the height direction, and the projections of the explosion-proof valve, the exhaust channel and the guide channel along the height direction on the shell at least partially overlap.

[0006] Optionally, the single cell battery has a width direction, the width direction intersects the height direction, and the shell includes a third wall and a fourth wall arranged opposite to each other along the width direction; the limiting member includes two partition bars, and the two partition bars are respectively connected to the third wall and the fourth wall, so that the two partition bars jointly define the guide channel.

[0007] Optionally, the single cell further has a length direction, and the length direction, the width direction and the height direction intersect each other; at least one of the partition bars is provided with a partition notch along the length direction to divide the partition bar into at least two sub-partition bars.

[0008] Optionally, the limiting member further includes a support bar, and the support bar is connected between the two partition bars.

[0009] Optionally, the single battery further has a length direction and a width direction, and the length direction, the width direction and the height direction intersect each other; the length of the partition bar in the length direction is L 3 mm and the length L of the shell in the longitudinal direction 1 mm, satisfying: 0.003≤L 3 / L 1 <1; and / or, the sum of the lengths of the two partition bars in the width direction is L 4 mm, the length of the shell in the width direction is L 2 mm, satisfying: 0.01≤L 4 / L 2 <1.

[0010] Optionally, the exhaust member includes an annular exhaust body and a plurality of guide portions inscribed in the exhaust body, and the plurality of guide portions are arranged at intervals along the length direction.

[0011] Optionally, the exhaust body includes a first section and a second section arranged opposite to each other along the width direction, and also includes a third section and a fourth section arranged opposite to each other along the length direction, the first section, the third section, the second section and the fourth section are sequentially connected to form the exhaust body, and a plurality of the guide parts are respectively protruding from the first section and the second section, and the guide parts on the first section and the guide parts on the second section are alternately arranged with each other along the length direction.

[0012] Optionally, at least one of the third segment and the fourth segment is provided with a chamfer.

[0013] Optionally, an adhesive strip is attached to the surface of the exhaust body in the height direction facing the explosion-proof hole, and the exhaust component is fixed in the exhaust cavity by the adhesive strip.

[0014] Optionally, the adhesive strip is one or more adhesive strips extending along the length direction, or the adhesive strip is an annular adhesive strip surrounding the exhaust passage.

[0015] Optionally, the exhaust member has a thickness in a height direction of 0.2 mm to 5 mm.

[0016] A second aspect of an embodiment of the present application provides a battery pack, comprising the single cell battery as described above.

[0017] Through one or more of the above embodiments of the present invention, at least the following technical effects can be achieved:

[0018] In the technical solution disclosed in the utility model, a limiter is provided on the inner wall surface of the shell, and an exhaust cavity for inserting the exhaust member is formed between the limiter and the shell. Therefore, during the assembly of the battery cell, the exhaust member can be inserted into the exhaust cavity first, and the exhaust member can be restricted in the exhaust cavity by the limiter, and then the battery cell can be placed in the shell. In this way, the exhaust member is prevented from scratching the shell when the battery cell is put into the shell, and it is easy to assemble, which is conducive to improving the assembly efficiency of the single battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The technical solutions and other beneficial effects of the present invention will be made apparent by describing in detail the specific embodiments of the present invention in conjunction with the accompanying drawings.

[0020] Figure 1 A schematic diagram of the structure of a single cell provided in an embodiment of the utility model;

[0021] Figure 2 for Figure 1 Schematic diagram of the explosion of a single cell;

[0022] Figure 3 is a side view of the shell;

[0023] Figure 4 is the front view of the shell;

[0024] Figure 5 yes Figure 3 Cross-sectional view along AA direction;

[0025] Figure 6 It is a schematic diagram of the structure of the exhaust component;

[0026] Figure 7 is a front view of the exhaust component;

[0027] Figure 8 It is a side view of the exhaust component and a partial enlarged view;

[0028] Figures 9-11 Schematic diagrams of the sticking methods of the adhesive strips on the exhaust parts in three embodiments;

[0029] Fig.12 is a schematic diagram of the exhaust assembly being assembled to the housing;

[0030] Fig.13 It is a schematic diagram of the housing with the exhaust parts installed and a partial enlarged diagram;

[0031] Fig.14 is a partial schematic diagram of the shell opening;

[0032] Fig.15 is a partial schematic diagram of the housing opening in another embodiment;

[0033] Description of the numbers in the figure:

[0034] 1. Single battery;

[0035] 11. shell, 11a. first wall, 11b. second wall, 11c. third wall, 11d. fourth wall, 11e. fifth wall, 11f. sixth wall, 111. inner cavity, 1111. battery cell cavity, 1112. exhaust cavity, 1112a. inlet, 112. opening;

[0036] 12. explosion-proof components, 121. explosion-proof holes, 1211. projection area, 122. explosion-proof valve;

[0037] 13. end cover assembly, 131. end cover, 132. pole;

[0038] 14. Battery cells;

[0039] 15. Exhaust member, 151. Exhaust body, 1511. First section, 1512. Second section, 1513. Third section, 1514. Fourth section, 152. Chamfer, 153. Exhaust channel, 154. Guide, 1541. Fixed end, 1542. Free end, 155. Adhesive strip;

[0040] 16. Limiting member, 161. Guide channel, 162. Partition bar, 163. Support bar. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and beneficial effects of this application more clear, the following further describes this application in detail in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for explaining this application, not for limiting this application.

[0042] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0043] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0045] The embodiment of the present application provides a single cell and a battery pack having the single cell. The single cell is provided with a limiter on the inner wall surface of the shell, and an exhaust cavity is formed between the limiter and the shell for inserting the exhaust member. Therefore, during the assembly of the battery cell, the exhaust member can be inserted into the exhaust cavity first, and the exhaust member can be restricted in the exhaust cavity by the limiter, and then the battery cell can be placed in the shell. In this way, the exhaust member is prevented from scratching the shell when the battery cell is placed in the shell, and it is easy to assemble, which is conducive to improving the assembly efficiency of the single cell.

[0046] In some embodiments of the present application, a battery pack is provided, including a single cell 1 .

[0047] The present application embodiment provides a single battery 1, referring to Figure 1 to Figure 3 The single battery 1 includes a shell 11, an explosion-proof component 12, an end cover component 13 and a battery cell 14.

[0048] In some embodiments of the present application, reference Figure 1 to Figure 3 The single battery 1 has a length direction X, a width direction Y and a height direction Z that intersect each other. Figure 1 to Figure 3 In the embodiment shown, the length direction X, the width direction Y and the height direction Z are orthogonal to each other. Figure 1 to Figure 3 The shell 11 includes a first wall 11a and a second wall 11b that are oppositely arranged along the length direction X, a third wall 11c and a fourth wall 11d that are oppositely arranged along the width direction Y, and a fifth wall 11e and a sixth wall 11f that are oppositely arranged along the height direction Z. The third wall 11c, the fifth wall 11e, the fourth wall 11d and the sixth wall 11f are sequentially connected to enclose a shell structure with openings at both ends in the length direction X. The third wall 11c and the fourth wall 11d are respectively covered on the two openings of the shell to define an inner cavity 111 on the inner side of the shell 11, and the battery cell 14 is accommodated in the inner cavity 111. Specifically, Figure 12-13 As shown, at least one of the first wall surface 11 a and the second wall surface 11 b is provided with an opening 112 for allowing the battery cell 14 to enter the inner cavity 111 .

[0049] The explosion-proof assembly 12 includes an explosion-proof hole 121 and an explosion-proof valve 122. Figure 1 and Figure 2 In the illustrated embodiment, the explosion-proof hole 121 is disposed on the sixth wall 11f of the housing 11. In other implementations of the present application, the explosion-proof hole 121 is opened on the fifth wall 11e, and the explosion-proof valve 122 is installed on the explosion-proof hole 121. When the air pressure inside the housing 11 is too high, the explosion-proof valve 122 will be opened to discharge the gas inside the housing 11, thereby preventing the battery from catching fire or exploding. In the illustrated embodiment, when the single battery 1 is used as a power source for an electric vehicle, in order to prevent gas and particulate matter from entering the passenger compartment when the explosion-proof valve 122 is opened, the explosion-proof hole 121 is disposed on the bottom surface of the housing 11, that is, the explosion-proof hole 121 is disposed on the fifth wall 11e.

[0050] In the illustrated embodiment, the housing 11 is a structure with openings on both sides, that is, openings 112 are respectively provided on the first wall 11a and the second wall 11b of the housing 11. Correspondingly, pole tabs are provided on both sides of the battery cell 14 along the length direction X to form a pole tab structure with opposite sides. The end cap assembly 13 is provided on the openings 112 on both sides of the housing 11 to seal the inner cavity 111. The end cap assembly 13 includes an end cap 131 and a pole 132 provided on the end cap 131, and the pole 132 is welded to the corresponding pole tab on the battery cell 14 to achieve electrical connection.

[0051] See also Fig.13 The single cell battery 1 of the embodiment of the present application also includes an exhaust member 15 and a limit member 16, wherein the exhaust member 15 is arranged in the inner cavity 111 of the shell 11 and is located between the battery cell 14 and the explosion-proof valve 122. Its functions are: on the one hand, it can form an exhaust flow channel between the battery cell 14 and the explosion-proof valve 122, so that the gas inside the battery can be discharged through the explosion-proof valve 122; on the other hand, it can guide the flow of gas to avoid gas accumulation in a local area.

[0052] For details, see Figure 6-7 The exhaust member 15 includes an exhaust body 151 and a plurality of guides 154 connected to the exhaust body 151. The exhaust body 151 may be a thin plate structure. When the exhaust member 15 is placed between the battery cell 14 and the explosion-proof valve 122, the fifth wall 11e of the housing 11 mainly supports the battery cell 14 through the exhaust body 151.

[0053] In the illustrated embodiment, the exhaust body 151 is annular as a whole. Specifically, the exhaust body 151 includes a first section 1511 and a second section 1512 that are relatively arranged along the width direction Y, and also includes a third section 1513 and a fourth section 1514 that are relatively arranged along the length direction X. The first section 1511, the third section 1513, the second section 1512 and the fourth section 1514 are sequentially connected and enclosed to form the exhaust body 151, and an exhaust channel 153 is defined on the inner side of the exhaust body 151. In other words, the exhaust channel 153 penetrates the exhaust body 151 along the thickness direction of the exhaust body 151.

[0054] During the cyclic charge and discharge process of the single battery 1, the battery core 14 generates gas to form an airflow in the housing 11, and the exhaust channel 153 allows the airflow to flow from one side of the battery core 14 to the explosion-proof valve 122. The guide portion 154 is located in the exhaust channel 153. Figure 6 , Figure 7 and Fig.12 In the embodiment shown, a plurality of guide portions 154 are respectively protruded from the first section 1511 and the second section 1512 of the exhaust body 151, and the guide portions 154 are inscribed in the first section 1511 or the second section 1512. Figure 6 , Figure 7and Fig.12 The guide portion 154 includes a fixed end 1541 and a free end 1542 that are arranged opposite to each other along the width direction Y. The guide portion 154 is in the shape of a shark fin. The fixed end 1541 is connected to the first section 1511 or the second section 1512. Figure 7 The positive projection of the explosion-proof valve 122 in the height direction Z falls within the exhaust body 151 to form a projection area 1211 , so that the gas entering the exhaust channel 153 can be guided to the position where the explosion-proof valve 122 is located.

[0055] The shape of the exhaust member 15 is adapted to the shape of the shell 11, that is, the exhaust member 15 has a certain length, so that the internal exhaust channel 153 also extends a longer distance along the length direction X. And the longer the length of the shell 11, the longer the length of the exhaust channel 153. In order to further enhance the air guiding effect, in some embodiments of the present application, the exhaust member 15 may include a plurality of guides 154, and the plurality of guides 154 are sequentially arranged in the exhaust channel 153 at intervals along the length direction X. It should be noted that the distance between two adjacent guides 154 in the length direction X may be equal or unequal.

[0056] When a plurality of guide portions 154 are provided in the exhaust member 15 , the plurality of guide portions 154 may all be located on one side of the exhaust body 151 in the width direction Y, or may be distributed on both sides of the exhaust body 151 in the width direction Y, so as to enhance the guiding effect of the airflow generated by the battery cell 14 .

[0057] Reference Figure 6-7 In this embodiment, a plurality of guide portions 154 are distributed on the first section 1511 and the second section 1512, and the guide portions 154 on the first section 1511 and the guide portions 154 on the second section 1512 are arranged alternately with each other along the length direction X. Moreover, the free end 1542 of each guide portion 154 extends toward the projection area 1211 (i.e., the location of the explosion-proof valve 122). Therefore, when the gas enters the exhaust channel 153 and moves along a guide portion 154 to the free end 1542 of the guide portion 154, it will move along the next adjacent guide portion 154 and be guided by the next guide portion 154, and finally guided to the location of the explosion-proof valve 122. Such a structure makes the flow of the airflow more orderly and helps to achieve directional flow of the gas.

[0058] In some embodiments, reference Figure 1 and Figure 2, the explosion-proof valve 122 is arranged at the middle of the fifth wall surface 11e of the shell 11 in the length direction X, so that the gas can be discharged after being collected, and accordingly, the projection area 1211 of the explosion-proof valve 122 on the exhaust body 151 of the exhaust member 15 is also located in the middle of the length direction X. At this time, along the length direction X, both sides of the projection area 1211 in the width direction Y are provided with guide parts 154, and the guide parts 154 on each side are arranged in a staggered manner on the first section 1511 and the second section 1512, so that the gas at both ends of the exhaust body 151 in the length direction X can be quickly guided to the area where the explosion-proof valve 122 is located.

[0059] The limiting member 16 is disposed in the inner cavity 111 of the housing 11 and connected to the inner wall of the housing 11. The limiting member 16 divides the inner cavity 111 into a battery cell cavity 1111 and an exhaust cavity 1112 which are interconnected, and the exhaust cavity 1112 is located between the battery cell cavity 1111 and the explosion-proof valve 122. The battery cell 14 is disposed in the battery cell cavity 1111, and the exhaust member 15 is disposed in the exhaust cavity 1112 and is restricted in the exhaust cavity 1112 by the limiting member 16. Since the exhaust member 15 has an exhaust passage 153 penetrating the exhaust member 15 along its thickness direction (i.e., the height direction Z of the single battery 1), and the limiting member 16 has a guide passage 161 penetrating from the battery cell cavity 1111 to the exhaust passage 153, the battery cell cavity 1111 and the exhaust passage 153 are in fluid communication with each other through the guide passage 161, and the gas in the battery cell cavity 1111 can be discharged through the explosion-proof valve 122.

[0060] It should be noted that the exhaust member 15 is limited in the exhaust cavity 1112 by the limiting member 16, which means that the exhaust member 15 is relatively fixed in the exhaust cavity 1112, and its degree of freedom along the height direction Z is limited by the limiting member 16. During the battery assembly process, the exhaust member 15 can be placed in the exhaust cavity 1112 first, and then the battery cell 14 can be placed in the battery cell cavity 1111 through the opening 112 on one side of the shell 11. In this way, the exhaust member 15 is prevented from scratching the shell 11 when the battery cell 14 is placed in the shell, thereby improving the efficiency of battery assembly.

[0061] Specifically, the explosion-proof valve 122, the exhaust member 15 and the limit member 16 are arranged in sequence along the height direction Z of the single battery 1, and the projections of the explosion-proof hole 121, the exhaust channel 153 and the guide channel 161 along the height direction Z on the housing 11 at least partially overlap, thereby ensuring the smoothness of gas flow. Among them, the projection of the exhaust channel 153 along the height direction Z refers to the area enclosed by the projection of the inner wall surface of the exhaust channel 153 along the height direction Z. The projection of the guide channel 161 along the height direction Z refers to the area enclosed by the projection of the inner wall surface of the guide channel 161 along the height direction Z.

[0062] See also Figure 13-14In some embodiments, the stopper 16 includes two partition bars 162, which are connected to two opposite inner walls of the shell 11 to define a guide channel 161 between the two partition bars 162. Specifically, the partition bars 162 are respectively connected to the third wall surface 11c and the fourth wall surface 11d of the shell 11, and the two partition bars 162 and the third wall surface 11c, the fourth wall surface 11d and the fifth wall surface 11e of the shell 11 jointly define an exhaust cavity 1112.

[0063] See also Fig.12 and Fig.13 , the two partition bars 162 are in a sliding groove structure as a whole, and the end of the exhaust cavity 1112 facing the opening 112 of the shell 11 has an inlet 1112a, and the exhaust member 15 can be inserted into the exhaust cavity 1112 through the inlet 1112a, and the two partition bars 162 form a support and limit for the exhaust member 15. The height of the exhaust cavity 1112 is preferably adapted to the height of the exhaust member 15 to ensure that the exhaust member 15 can be smoothly inserted into the exhaust cavity 1112, and at the same time can be relatively limited in the height direction to improve the stability of the assembly. It should be noted that the height of the exhaust cavity 1112 refers to the distance between the inner surface of the bottom wall of the shell 11 and the lower surface of the partition bar 162 along the height direction Z. If the distance is too small, it will make it difficult for the exhaust member 15 to be inserted into the exhaust cavity 1112; if it is too large, it will cause the exhaust member 15 to have poor assembly stability and easily slide in the exhaust cavity 1112. Preferably, the distance should be slightly larger than the thickness of the exhaust member 15.

[0064] See also Fig.14 In some embodiments, at least one side of the inlet 1112a of the exhaust cavity 1112 is provided with a chamfer (not shown in the figure). When the exhaust member 15 is inserted into the exhaust cavity 1112 through the inlet 1112a, due to the presence of the chamfer at the inlet 1112a, the exhaust member 15 is more smoothly inserted into the exhaust cavity 1112, and the friction between the exhaust member 15 and the housing 11 is also reduced.

[0065] The partition bar 162 can be made of metal, plastic, etc., and is preferably made of the same material as the housing 11. The partition bar 162 can be fixedly connected to the inner wall surface of the housing 11 by welding, injection molding, etc., or can be integrally formed with the housing 11.

[0066] The two partition bars 162 are parallel to each other and are located at the same height on the inner wall surface of the housing 11. The lengths of the two partition bars 162 can be equal or different. It should be noted that the length of the partition bar 162 refers to the extension length of the partition bar 162 in the length direction X.

[0067] In some embodiments, the partition bar 162 has a length that matches the exhaust member 15, that is, when the exhaust member 15 is long, the partition bar 162 needs to have a certain length to form an exhaust cavity 1112 of sufficient length, so as to better limit the exhaust member 15. Moreover, when the exhaust member 15 is longer, the length of the partition bar 162 is correspondingly longer. Of course, the present application has no restrictions on the length of the partition bar 162 and the exhaust member 15, that is, the length of the partition bar 162 can be equal to the length of the exhaust member 15, or it can be greater than or less than the length of the exhaust member 15.

[0068] The longer the partition strip 162 is, the better the effect of limiting the position of the exhaust member 15 is. In some embodiments, the length of the partition strip 162 can be the same as the length of the shell 11, that is, the inlet 1112a of the exhaust cavity 1112 is flush with the opening 112 of the shell 11. Fig.14 In other embodiments, the length of the partition bar 162 may be smaller than the length of the housing 11 , that is, the inlet 1112 a of the exhaust cavity 1112 is located in the inner cavity 111 of the housing 11 .

[0069] Specifically, if Figure 3-5 As shown, the length of the housing 11 in the length direction X is L 1 , the length of the partition bar 162 in the length direction X is L 3 , then L 1 , L 3 Satisfy: 0.003≤L 3 / L 1 <1, that is, the length ratio L between the partition bar 162 and the housing 11 3 / L 1 Need to be controlled within 0.003≤L 3 / L 1 L<1, for example, it can be 0.003, 0.005, 0.01, 0.02, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 0.99 or any two of them. It is worth noting that the above specific values ​​are only given for example. 3 / L 1 Any value within the range of <1 is within the protection scope of the present application.

[0070] In the present application, by controlling the length ratio between the partition bar 162 and the housing 11, the length of the partition bar 162 is within a suitable range, thereby being able to limit the exhaust member 15. Of course, the ratio L 3 / L 1The larger it is, the better the role of the partition strip 162 in limiting the exhaust member 15 is, and the more stable the exhaust member 15 is in the exhaust chamber 1112.

[0071] The width of the partition strip 162 will also have a certain influence on the limiting effect of the exhaust member 15, that is, the larger the width, the better the limiting effect of the exhaust member 15. It should be noted that the width of the partition strip 162 here refers to the length of the partition strip 162 in the width direction Y.

[0072] Specifically, Figure 3-5 As shown, the length of the housing 11 in the width direction Y is L 2 mm, the sum of the lengths of the two partition bars 162 in the width direction Y is L 4 mm, then L 2 , L 4 Satisfy: 0.01≤L 4 / L 2 <1, that is, the width ratio L of the partition bar 162 and the shell 11 4 / L 2 Need to be controlled within 0.01≤L 4 / L 2 L<1, for example, it can be 0.01, 0.02, 0.04, 0.05, 0.06, 0.08, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 0.99 or any two of them. It is worth noting that the above specific values ​​are only given for example. 4 / L 2 Any value within the range of <1 is within the protection scope of the present application.

[0073] In the present application, by controlling the width ratio between the partition bar 162 and the housing 11, the width of the partition bar 162 is within a suitable range, thereby being able to limit the position of the exhaust member 15. Of course, the ratio L 4 / L 2 The larger it is, the better the role of the partition strip 162 in limiting the exhaust member 15 is, and the more stable the exhaust member 15 is in the exhaust chamber 1112.

[0074] In some embodiments, reference Fig.15 In addition to the partition bar 162, the limiting member 16 also includes a support bar 163, and the support bar 163 is connected between the two partition bars 162. The two partition bars 162 and the support bar 163 are integrally formed to form the plate structure of the limiting member 16. 4 It no longer represents the length of a single partition bar 162 in the width direction Y, but represents the total length of two partition bars 162 and the support bar 163 in the width direction Y.

[0075] The setting of the support bar 163 can improve the support and limiting effect of the exhaust member 15 on the one hand, and can improve the strength of the limiting member 16 on the other hand, and enhance the auxiliary support effect of the battery cell 14. The support bar 163 can be made of the same material as the partition bar 162, and can be connected to the partition bar 162 by welding or integral molding. The number of support bars 163 can be one or more. There is no limit to the setting position of the support bar 163, which can be connected to the two ends of the partition bar 162 or to the middle of the partition bar 162. Fig.15 This is a situation where the number of support bars 163 is two, and they are respectively connected to the two ends of the partition bar 162 .

[0076] In some embodiments, the partition bar 162 is provided with a partition notch along the length direction X, and the partition notch divides the partition bar 162 into at least two sub-partition bars. That is, in this embodiment, the partition bar 162 is not a continuous whole, but is composed of two or more independent sub-partition bars. In this case, the two or more sub-partition bars can also separate the exhaust cavity 1112 from the inner cavity 111, and play a role in limiting the exhaust member 15.

[0077] When the partition bar 162 includes a plurality of sub-partition bars, the plurality of sub-partition bars are preferably evenly arranged on the inner wall surface of the shell 11 along the length direction X, so that the exhaust member 15 can be better limited.

[0078] It can be understood that in some embodiments, when the partition bar 162 includes two or more sub-partition bars, a pair of sub-partition bars on opposite inner walls of the shell 11 can still be connected by the support bar 163.

[0079] In some embodiments, at least one of the third section 1513 and the fourth section 1514 is provided with a chamfer 152. Figure 8 As shown, the third section 1513 and the fourth section 1514 have chamfers 152 on the side facing away from the explosion-proof valve 122 in the height direction Z (i.e., the side facing the limit member 16), so that when the battery cell 14 is loaded into the battery cell cavity 1111 through the opening 112, the presence of the chamfer 152 can reduce the scratching of the exhaust member 15 on the battery cell 14, thereby reducing the damage to the battery cell 14.

[0080] In some embodiments, in order to further improve the stability of the exhaust member 15 in the exhaust cavity 1112, an adhesive strip 155 is attached to the surface of the exhaust body 151 facing the explosion-proof valve 122 in the height direction Z, so that the exhaust member 15 can be fixed in the exhaust cavity 1112 through the adhesive strip 155. For example, the exhaust member 15 is bonded and fixed to the limit member 16 through the adhesive strip 155, thereby improving the stability of the exhaust member 15. The adhesive strip 155 can be any material with bonding or adsorption function, such as adhesive backing.

[0081] In some embodiments, the adhesive strip 155 is a ring-shaped adhesive strip 155 surrounding the exhaust channel 153, such as Fig. 9 In other embodiments, the adhesive strip 155 may be one or more adhesive strips extending along the length direction X, such as Figure 10-11 As shown, better bonding and fixing effects of the exhaust component 15 can also be achieved.

[0082] The length of the adhesive strip 155 needs to meet certain requirements. If the length is too small, it is difficult to achieve a good bonding and fixing effect. The length of the adhesive strip 155 refers to the length of the adhesive strip 155 in the length direction X. When the adhesive strip 155 is a plurality of adhesive strips 155 extending along the length direction X, the length of the adhesive strip 155 refers to the sum of the lengths of the plurality of adhesive strips 155. If the length of the exhaust body 151 in the length direction X is L 5 mm, the length of the adhesive strip 155 in the length direction X is L 7 mm, then L 5 , L 7 Satisfy: 0.1≤L 7 / L 5 ≤1, that is, the length ratio L of the adhesive strip 155 and the exhaust body 151 7 / L 5 It needs to be controlled within the range of 0.1 to 1, for example, it can be one of 0.1, 0.2, 0.4, 0.5, 0.6, 0.8, 1.0 or any two of them. It is worth noting that the above specific values ​​are only given for example, and any value within the range of 0.1 to 1 is within the protection scope of this application.

[0083] Similarly, the width of the adhesive strip 155 also needs to meet certain requirements. If the width is too small, it is difficult to achieve a good bonding and fixing effect. The width of the adhesive strip 155 refers to the length of the adhesive strip 155 in the width direction Y. If the length of the exhaust body 151 in the width direction Y is L 6 mm, the length of the adhesive strip 155 in the width direction Y is L 8 mm, then L 6 , L 8 Satisfy: 0.1≤L 8 / L 6 ≤1, that is, the width ratio L of the adhesive strip 155 and the exhaust body 151 8 / L 6It needs to be controlled within the range of 0.1 to 1, for example, it can be one of 0.1, 0.2, 0.4, 0.5, 0.6, 0.8, 1.0 or any two of them. It is worth noting that the above specific values ​​are only given for example, and any value within the range of 0.1 to 1 is within the protection scope of this application.

[0084] In the present application, there are certain requirements for the thickness of the exhaust member 15 in the height direction Z. Generally, the thickness of the exhaust member 15 can be set to 0.2 mm to 5 mm, for example, it can be 0.2 mm, 0.3 mm, 0.5 mm, 0.8 mm, 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4.0 mm, 4.5 mm, 5.0 mm, or any two of them. It is worth noting that the above specific values ​​are only given for example, and any value within the range of 0.2 mm to 5 mm is within the protection scope of the present application.

[0085] If the thickness of the exhaust member 15 is too small, it cannot support the battery cell 14 and form an exhaust flow channel. If the thickness of the exhaust member 15 is too large, it will not improve the exhaust effect, but will occupy the internal space of the shell 11 and increase the weight of the battery. Therefore, the thickness of the exhaust member 15 is generally controlled to be less than 5 mm. It should be noted that when the adhesive strip 155 is attached to the exhaust member 15, the total thickness of the exhaust member 15 and the adhesive strip 155 needs to be controlled within the range of 0.2 mm to 5 mm.

[0086] On the other hand, the present application also provides a battery pack, comprising: a box and the above-mentioned single battery, wherein the single battery is accommodated in the box. The above-mentioned battery pack can be, but is not limited to, a CMP type battery pack, a CTP type battery pack, etc.

[0087] On the other hand, the present application also provides an electric device, which includes the above-mentioned battery pack, and the battery pack serves as a power supply for the electric device. The electric device may be, but is not limited to, a mobile device (such as a mobile phone, a laptop computer, etc.), an electric vehicle (such as a pure electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, an electric bicycle, an electric scooter, an electric golf cart, an electric truck, etc.), an electric train, a ship and a satellite, an energy storage system, etc.

[0088] In summary, although the present application has been disclosed as above with preferred embodiments, the above preferred embodiments are not intended to limit the present application. Ordinary technicians in this field can make various changes and modifications without departing from the spirit and scope of the present application. Therefore, the scope of protection of the present application shall be based on the scope defined in the claims.

Claims

1. A single cell battery, characterized in that: include: A shell (11) having an inner cavity (111), wherein the shell (11) is provided with an explosion-proof hole (121); an explosion-proof valve (122), connected to the housing (11) and closing the explosion-proof hole (121); a limiting member (16) disposed in the inner cavity (111) and connected to the inner wall of the shell (11), wherein the inner cavity (111) is divided by the limiting member (16) into a battery cell cavity (1111) and an exhaust cavity (1112) that are connected to each other, wherein the exhaust cavity (1112) is located between the battery cell cavity (1111) and the explosion-proof valve (122); A battery cell (14) is accommodated in the battery cell cavity (1111); and An exhaust member (15) is accommodated in the exhaust cavity (1112) and is restricted in the exhaust cavity (1112) by the limiting member (16); The exhaust member (15) has an exhaust channel (153) that penetrates the exhaust member (15) along the thickness direction thereof, and the exhaust channel (153) is configured to be fluidically connected to the explosion-proof valve (122); the limiting member (16) has a guide channel (161) that penetrates from the battery cell cavity (1111) to the exhaust channel (153), and the battery cell cavity (1111) and the exhaust channel (153) are fluidically connected to each other via the guide channel (161).

2. The single cell according to claim 1, characterized in that: The single cell has a height direction (Z), the explosion-proof valve (122), the exhaust member (15) and the limit member (16) are arranged along the height direction (Z), and the projections of the explosion-proof valve (122), the exhaust channel (153) and the guide channel (161) along the height direction (Z) on the housing (11) at least partially overlap.

3. The single cell according to claim 2, characterized in that: The single cell has a width direction (Y), the width direction (Y) intersects the height direction (Z), and the housing (11) comprises a third wall surface (11c) and a fourth wall surface (11d) arranged opposite to each other along the width direction (Y); The limiting member (16) comprises two partition bars (162), and the two partition bars (162) are respectively connected to the third wall surface (11c) and the fourth wall surface (11d), so that the two partition bars (162) jointly define the guide channel (161).

4. The single cell according to claim 3, characterized in that: The single cell also has a length direction (X), and the length direction (X), the width direction (Y) and the height direction (Z) intersect each other; At least one of the partition bars (162) is provided with a partition notch along the length direction (X) so as to divide the partition bar (162) into at least two sub-partition bars.

5. The single cell according to claim 3, characterized in that: The limiting member (16) further comprises a supporting bar (163), wherein the supporting bar (163) is connected between the two partition bars (162).

6. The single cell according to claim 3, characterized in that: The single cell also has a length direction (X) and a width direction (Y), and the length direction (X), the width direction (Y) and the height direction (Z) intersect each other; The length of the partition bar (162) in the length direction (X) is L3 mm and the length of the shell (11) in the length direction (X) is L1 mm, satisfying: 0.003≤L3 / L1<1; And / or, the sum of the lengths of the two partition bars (162) in the width direction (Y) is L4 mm, and the length of the shell (11) in the width direction (Y) is L2 mm, satisfying: 0.01≤L4 / L2<1.

7. The single cell according to claim 2, characterized in that: The exhaust member (15) comprises an annular exhaust body (151) and a plurality of guide portions (154) inscribed in the exhaust body (151), wherein the plurality of guide portions (154) are arranged at intervals along a length direction (X).

8. The single cell according to claim 7, characterized in that: The exhaust body (151) comprises a first section (1511) and a second section (1512) which are arranged opposite to each other along a width direction (Y), and further comprises a third section (1513) and a fourth section (1514) which are arranged opposite to each other along a length direction (X); the first section (1511), the third section (1513), the second section (1512) and the fourth section (1514) are sequentially connected to form the exhaust body (151); a plurality of guide portions (154) are respectively protrudingly provided on the first section (1511) and the second section (1512); the guide portions (154) on the first section (1511) and the guide portions (154) on the second section (1512) are arranged alternately with each other along the length direction (X).

9. The single cell according to claim 8, characterized in that: At least one of the third section (1513) and the fourth section (1514) is provided with a chamfer (152).

10. The single cell according to claim 7, characterized in that: An adhesive strip (155) is attached to the surface of the exhaust body (151) facing the explosion-proof hole (121) in the height direction (Z), and the exhaust component (15) is fixed in the exhaust cavity (1112) via the adhesive strip (155).

11. The single cell according to claim 10, characterized in that: The adhesive strip (155) is one or more adhesive strips extending along the length direction (X), or the adhesive strip (155) is an annular adhesive strip surrounding the exhaust passage (153).

12. The single cell according to claim 10, characterized in that: The thickness of the exhaust member (15) in the height direction (Z) is 0.2 mm to 5 mm.

13. A battery pack, characterized in that: The invention comprises a single cell according to any one of claims 1 to 12.

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