Battery cell and battery pack

Abstract

The utility model discloses a battery monomer and discloses a battery pack with the battery monomer, the battery monomer comprises a cylinder body, a first end cover, a second end cover and a battery core assembly, the first end cover and the second end cover are respectively arranged at two ends of the cylinder body, the cylinder body, the first end cover and the second end cover define a containing space, the battery core assembly is arranged in the containing space, and the battery core assembly is arranged in the containing space. The first end cover is provided with a first connecting structure, the second end cover is provided with a second connecting structure, and the first connecting structure is used for being connected with the second connecting structure of the second end cover of another battery monomer, so that the traditional technical scheme of connecting two battery monomers by using a connecting kit can be abandoned, and the number of parts of the battery pack can be reduced; the production efficiency of the battery pack can be improved, and the production and manufacturing cost of the battery pack can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery monomer and battery pack. BACKGROUND

[0002] At present, when splicing multiple battery monomers, two adjacent battery monomers are connected through a connecting kit, the number of parts of the battery pack increases, resulting in increased production cost of the battery pack. INNOVATIVE CONTENT

[0003] The utility model discloses at least one of the technical problems in the prior art is solved, and for this purpose, the utility model provides a battery monomer, which can reduce the production cost of the battery pack.

[0004] The utility model discloses a battery pack with the battery monomer.

[0005] The battery monomer according to the first aspect of the utility model comprises:

[0006] The barrel is provided with a first end cover and a second end cover at both ends respectively, the barrel, the first end cover and the second end cover define a containing space, an electric core assembly is arranged in the containing space, the first end cover is provided with a first connecting structure, the second end cover is provided with a second connecting structure, and the first connecting structure is used for being connected with the second connecting structure of the second end cover of another battery monomer.

[0007] The battery monomer according to the first aspect of the utility model has at least the following beneficial effects:

[0008] When producing the battery pack, multiple battery monomers are connected in series, the first connecting structure of one of the two adjacent battery monomers is connected with the second connecting structure of the other battery, the two adjacent battery monomers can be connected, the traditional technical scheme of connecting two battery monomers using a connecting kit can be abandoned, the number of parts of the battery pack can be reduced, on the one hand, the production efficiency of the battery pack can be improved, and on the other hand, the production cost of the battery pack can be reduced.

[0009] According to some embodiments of the utility model, the first connecting structure is a limiting protrusion, the second connecting structure is a mounting groove, the mounting groove comprises an avoiding groove and a limiting groove communicated with the avoiding groove, the limiting protrusion enters the limiting groove through the avoiding groove and can abut against the side wall of the limiting groove.

[0010] According to some embodiments of the utility model, the first connecting structure is an internal thread, the second connecting structure is an external thread matched with the internal thread, and the internal thread is threadedly matched with the external thread.

[0011] According to some embodiments of the present application, the first end cover comprises a first main body part and a first annular protrusion, the first main body part is arranged at one end of the cylinder, the first annular protrusion is arranged at one side of the first main body part away from the battery cell assembly, the first main body part and the first annular protrusion jointly define a first accommodating groove, and the first connecting structure is arranged at the outer circumferential side of the first annular protrusion.

[0012] The second end cover comprises a second main body part and a second annular protrusion, the second main body part is arranged at one end of the cylinder, the second annular protrusion is arranged at one side of the second main body part away from the battery cell assembly, the second main body part and the second annular protrusion jointly define a second accommodating groove, the second connecting structure is arranged at the inner circumferential side of the second annular protrusion, and the first annular protrusion is accommodated in the second accommodating groove of the other battery monomer.

[0013] According to some embodiments of the present application, the first main body part and the first annular protrusion are of an integrated structure, and / or the second main body part and the second annular protrusion are of an integrated structure.

[0014] According to some embodiments of the present application, one end of the first annular protrusion away from the battery cell assembly is provided with a sealing piece, the sealing piece is arranged in extension along the circumference of the first annular protrusion, and the sealing piece is used for abutting against the second main body part of the other battery monomer.

[0015] According to some embodiments of the present application, the battery monomer further comprises a heat exchange pipe, the heat exchange pipe is arranged through the first end cover and the second end cover, the heat exchange pipe penetrates through the accommodating space, and the outer wall of the heat exchange pipe is in contact with the battery cell assembly.

[0016] According to some embodiments of the present application, the heat exchange pipe comprises a center pipe, a first joint and a second joint, the first end cover is provided with a first mounting hole matched with the center pipe, the second end cover is provided with a second mounting hole matched with the center pipe, the first joint is arranged through the first mounting hole and is detachably connected with one end of the center pipe, and the second joint is arranged through the second mounting hole and is detachably connected with the other end of the center pipe.

[0017] According to some embodiments of the present application, first and second safety valves are further included, the first joint is provided with a first through hole communicating with the center pipe, the first safety valve is arranged at the first joint and covers the first through hole, the second joint is provided with a second through hole communicating with the center pipe, and the second safety valve is arranged at the second joint and covers the second through hole.

[0018] A battery pack according to a second aspect embodiment of the present invention includes at least two battery cells as described in the embodiments, wherein in two adjacent battery cells, the first connection structure of one battery cell is connected to the second connection structure of the other battery cell.

[0019] The battery pack according to the second aspect embodiment of the present invention has at least the following beneficial effects:

[0020] When manufacturing battery packs, multiple battery cells are connected in series. In two adjacent battery cells, the first connection structure of one battery cell is connected to the second connection structure of the other battery cell, thus connecting the two adjacent battery cells. This eliminates the need for the traditional method of using connecting kits to connect two battery cells, reducing the number of parts in the battery pack. On the one hand, this improves the production efficiency of the battery pack, and on the other hand, it reduces the manufacturing cost of the battery pack.

[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0023] Figure 1 This is a schematic diagram of the internal structure of a battery cell according to an embodiment of the present invention;

[0024] Figure 2 for Figure 1 A magnified view of part A in the middle;

[0025] Figure 3 This is a schematic diagram of the battery cell from another perspective according to an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the battery pack according to an embodiment of the present invention.

[0027] Figure label:

[0028] Cylinder body 100, first end cover 200, limiting protrusion 201, first containing groove 202, first main body part 210, first annular protrusion 220, fixing groove 221, second end cover 300, mounting groove 301, avoiding groove 3011, limiting groove 3012, second containing groove 302, second main body part 310, second annular protrusion 320, battery cell assembly 400, sealing element 500, sealing part 510, mounting part 520, center tube 610, first joint 620, first through hole 621, second joint 630, second through hole 631, first safety valve 640, second safety valve 650. DETAILED DESCRIPTION

[0029] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, and are used to explain the present application, and cannot be understood as a limitation of the present application.

[0030] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation of the present application.

[0031] In the description of the present application, the meaning of several is one or more, and the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, and above, below, etc. are understood as including the number. If it is described as first, second, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0032] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application according to the specific content of the technical solution.

[0033] Reference Figures 1 to 4According to the battery monomer of the first aspect embodiment of the utility model, including cylinder body 100, first end cover 200, second end cover 300 and electric core subassembly 400, first end cover 200 and second end cover 300 are arranged at both ends of cylinder body 100 respectively, cylinder body 100, first end cover 200 and second end cover 300 define the containing space, and the electric core subassembly 400 is arranged in the containing space, first end cover 200 is equipped with first connecting structure, and second end cover 300 is equipped with second connecting structure, and the first connecting structure is used for connecting with the second connecting structure of the second end cover 300 of another battery monomer, so that the technical scheme of connecting two battery monomers by using the connecting kit traditionally can be abandoned, the number of parts of the battery pack can be reduced, on the one hand, the production efficiency of the battery pack can be improved, and on the other hand, the production manufacturing cost of the battery pack can be reduced.

[0034] Specifically, when producing the battery pack, a plurality of battery monomers are connected in series, the first connecting structure of one of the two adjacent battery monomers is connected with the second connecting structure of the other battery, that is, the two adjacent battery monomers are connected, the technical scheme of connecting two battery monomers by using the connecting kit traditionally can be abandoned, the number of parts of the battery pack can be reduced, on the one hand, the production efficiency of the battery pack can be improved, and on the other hand, the production manufacturing cost of the battery pack can be reduced.

[0035] In some embodiments of the utility model, the first connecting structure is a limiting protrusion 201, the second connecting structure is a mounting groove 301, the mounting groove 301 includes an avoiding groove 3011 and a limiting groove 3012 communicated with the avoiding groove 3011, the limiting protrusion 201 enters the limiting groove 3012 through the avoiding groove 3011 and can abut against the side wall of the limiting groove 3012, so that the two adjacent battery monomers can be assembled conveniently, and the production efficiency of the battery pack can be improved.

[0036] Specifically, the mounting groove 301 is an L-shaped structure, the avoiding groove 3011 is arranged in the axial direction of the cylinder body 100, and the limiting groove 3012 is arranged in the circumferential direction of the cylinder body 100, when assembling the two battery monomers, the limiting protrusion 201 of one of the battery monomers enters the limiting groove 3012 through the avoiding groove 3011 of the other battery monomer, and the limiting protrusion 201 of one of the battery monomers can abut against the side wall of the limiting groove 3012 of the other battery monomer, so that the two adjacent battery monomers are limited to separate, the two adjacent battery monomers can be assembled conveniently, and the production efficiency of the battery pack can be improved.

[0037] It should be noted that a plurality of mounting grooves 301 are arranged, the plurality of mounting grooves 301 are arranged side by side and spaced apart in the circumferential direction of the cylinder body 100, a plurality of limiting protrusions 201 are correspondingly arranged, and the limiting protrusion 201 corresponds to the mounting groove 301, which is not limited herein.

[0038] It should be noted that the positions of the limiting protrusion 201 and the mounting groove 301 can be interchanged, that is, the limiting protrusion 201 is arranged on the second end cover 300, and the mounting groove 301 is arranged on the first end cover 200, which is not limited herein.

[0039] In some embodiments of the utility model, the first connecting structure is an internal thread, the second connecting structure is an external thread matched with the internal thread, the internal thread is threadedly matched with the external thread, adjacent two battery monomers can be conveniently assembled, and the production efficiency of the battery pack is improved.

[0040] Specifically, when assembling two battery monomers, the internal thread of one battery monomer is threadedly matched with the external thread of the other battery monomer, adjacent two battery monomers can be limited to separate, adjacent two battery monomers can be conveniently assembled, and the production efficiency of the battery pack is improved.

[0041] It should be noted that the positions of the internal thread and the external thread can also be interchanged, that is, the internal thread is arranged on the second end cover 300, and the external thread is arranged on the first end cover 200, which is not limited herein.

[0042] In some embodiments of the utility model, the first end cover 200 includes a first main body part 210 and a first annular protrusion 220, the first main body part 210 is arranged on one end of the cylinder body 100, the first annular protrusion 220 is arranged on the side of the first main body part 210 away from the battery core assembly 400, the first main body part 210 and the first annular protrusion 220 jointly define a first accommodating groove 202, the first connecting structure is arranged on the outer circumferential side of the first annular protrusion 220, the second end cover 300 includes a second main body part 310 and a second annular protrusion 320, the second main body part 310 is arranged on one end of the cylinder body 100, the second annular protrusion 320 is arranged on the side of the second main body part 310 away from the battery core assembly 400, the second main body part 310 and the second annular protrusion 320 jointly define a second accommodating groove 302, the second connecting structure is arranged on the inner circumferential side of the second annular protrusion 320, the first annular protrusion 220 is accommodated in the second accommodating groove 302 of the other battery monomer, in this way, the overall length of the battery pack can be reduced, the occupied space of the battery pack is reduced, and more battery monomers can be accommodated in a battery pack of the same size.

[0043] Specifically, one of the first end cover 200 and the second end cover 300 is the positive electrode of the battery monomer, and the other is the negative electrode of the battery monomer, the first accommodating groove 202 is arranged on the side of the first end cover 200 away from the battery core assembly 400, and the second accommodating groove 302 is arranged on the other side of the second end cover 300 away from the battery core assembly 400, by arranging the first accommodating groove 202 and the second accommodating groove 302, the first annular protrusion 220 of one of the battery monomers is accommodated in the second accommodating groove 302 of the other battery monomer, that is, the first annular protrusion 220 of one of the battery monomers is overlapped with the second annular protrusion 320 of the other battery monomer, which can reduce the overall length of the battery pack, thereby reducing the occupied space of the battery pack, and more battery monomers can be accommodated in the battery pack of the same size.

[0044] In some embodiments of the utility model, the first main body part 210 and the first annular protrusion 220 are of an integral structure, which can reduce the number of molds and thus reduce the production cost of the mold and the production cost of the first end cover 200.

[0045] Specifically, the first main body part 210 and the first annular protrusion 220 can be integrally formed by pressure casting, which can reduce the number of molds and thus reduce the production cost of the mold and the production cost of the first end cover 200.

[0046] As another implementation, the first annular protrusion 220 can be connected to the first main body part 210 by welding, wherein the welding method includes but is not limited to resistance welding, laser welding or ultrasonic welding, etc., which is not limited here.

[0047] It should be noted that the first main body part 210 and the cylinder 100 are provided with a first insulating member, and the first insulating member is sleeved on the first main body part 210 to insulate the first main body part 210 from the cylinder 100, which can improve the use reliability of the battery monomer.

[0048] In some embodiments of the utility model, the second main body part 310 and the second annular protrusion 320 are of an integral structure, which can reduce the number of molds and thus reduce the production cost of the mold and the production cost of the second end cover 300.

[0049] Specifically, the second main body part 310 and the second annular protrusion 320 can be integrally formed by pressure casting, which can reduce the number of molds and thus reduce the production cost of the mold and the production cost of the second end cover 300.

[0050] As another implementation, the second annular protrusion 320 can be connected to the second main body 310 by welding, which includes but is not limited to resistance welding, laser welding, ultrasonic welding, etc., without limitation.

[0051] It should be noted that the second main body 310 and the cylinder 100 are provided with a second insulating member, which is sleeved on the second main body 310 to insulate the second main body 310 from the cylinder 100, thereby improving the use reliability of the battery monomer.

[0052] In some embodiments of the present application, the first annular protrusion 220 is provided with a sealing member 500 at one end away from the battery cell assembly 400, which is arranged along the circumference of the first annular protrusion 220, and is used to abut against the second main body 310 of another battery monomer to form a closed space enclosed by the first end cover 200 and the second end cover 300, thereby preventing water or dust from entering the first receiving groove 202 and the second receiving groove 302.

[0053] It should be noted that the sealing member 500 is a sealing ring structure, which includes a sealing portion 510 and a mounting portion 520 connected to the sealing portion 510, and the first annular protrusion 220 is provided with a fixing groove 221, the mounting portion 520 is accommodated in the fixing groove 221 and can abut against the side wall of the fixing groove 221, the width of the fixing groove 221 gradually increases in the recess direction of the fixing groove 221, and the shape of the mounting portion 520 matches the shape of the fixing groove 221, thereby improving the connection stability of the sealing member 500 and the first annular protrusion 220.

[0054] In some embodiments of the present application, the battery monomer further comprises a heat exchange pipe, which is arranged through the first end cover 200 and the second end cover 300, and the heat exchange pipe penetrates the accommodation space and the outer wall of the heat exchange pipe is in contact with the battery cell assembly 400, the heat exchange pipe is connected to the external low-temperature fluid to exchange heat with the battery cell assembly 400, which can take away part of the heat generated by the battery cell assembly 400, thereby avoiding the internal temperature of the battery monomer from rising and reducing the battery charge and discharge efficiency and reliability, and the heat exchange pipe is connected to the external warm fluid to exchange heat with the battery cell assembly 400, which can help the battery cell assembly 400 to quickly heat up under extremely cold conditions, thereby improving the efficiency of electric energy utilization.

[0055] In some embodiments of the utility model, heat exchange pipe includes center tube 610, first joint 620 and second joint 630, first end cover 200 is equipped with the first mounting hole of adapting with center tube 610, second end cover 300 is equipped with the second mounting hole of adapting with center tube 610, first joint 620 is threaded in first mounting hole and is detachably connected with one end of center tube 610, second joint 630 is threaded in second mounting hole and is detachably connected with the other end of center tube 610, first joint 620 and second joint 630 can fix center tube 610 in the inside of battery monomer, and can also reinforce the connection between first end cover 200 and cylinder body 100 and the connection between second end cover 300 and cylinder body 100.

[0056] It should be noted that the first joint 620 is detachably connected with one end of the center tube 610 by threaded connection, and the second joint 630 is detachably connected with the other end of the center tube 610 by threaded connection, which can facilitate the disassembly and assembly of the first joint 620 and the second joint 630.

[0057] In some embodiments of the utility model, first safety valve 640 and second safety valve 650 are further included, the first joint 620 is provided with a first through hole 621 communicating with the center tube 610, the first safety valve 640 is arranged on the first joint 620 and covers the first through hole 621, the second joint 630 is provided with a second through hole 631 communicating with the center tube 610, and the second safety valve 650 is arranged on the second joint 630 and covers the second through hole 631.

[0058] For the battery monomer with electrolyte in the cylinder body 100, in order to avoid the leakage of electrolyte,

[0059] It should be noted that by arranging the first safety valve 640 and the second safety valve 650, the corrosive substances in the electrolyte can be prevented from contacting the electrode, so as to protect the internal structure of the battery from being damaged, and in the process of charging and discharging of the battery, the first safety valve 640 and the second safety valve 650 can release the overpressure gas, prevent the internal temperature of the battery from being too high, avoid the occurrence of thermal runaway phenomenon, when excessive gas pressure is generated in the battery, the first safety valve 640 and the second safety valve 650 will automatically open the valve to release the pressure, prevent the battery from being broken or deformed, and the use safety of the battery can be improved.

[0060] It should be noted that the specific structure of the first safety valve 640 and the second safety valve 650 is a known technology, which is not limited here.

[0061] It should be noted that the first safety valve 640 can be installed on the first joint 620 by welding, and the second safety valve 650 can be installed on the second joint 630 by welding, which is not limited here.

[0062] Referring to Figure 1 , Figure 2 According to the second aspect of the battery pack of the utility model, the battery pack comprises at least two battery monomers of the first aspect of the utility model, and the first connecting structure of one of the two adjacent battery monomers is connected with the second connecting structure of the other battery monomer.

[0063] Specifically, when the battery pack is produced, the plurality of battery monomers are connected in series, the first connecting structure of one of the two adjacent battery monomers is connected with the second connecting structure of the other battery, the two adjacent battery monomers can be connected, the technical scheme of connecting the two battery monomers by using the connecting kit can be abandoned, the number of parts of the battery pack can be reduced, on the one hand, the production efficiency of the battery pack can be improved, and on the other hand, the production manufacturing cost of the battery pack can be reduced.

[0064] The technical features of the above-described embodiments can be combined arbitrarily, and for the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, it should be considered that the combinations are within the scope of the present disclosure.

[0065] The above embodiment is described in detail in combination with the drawings, but the utility model is not limited to the above embodiment, and various changes can be made within the knowledge range possessed by ordinary skilled persons in the technical field without departing from the purpose of the utility model.

Claims

1. A battery cell, characterized by, The application relates to a battery monomer, which comprises the following parts: a barrel (100), first and second end covers (200 and 300) arranged at two ends of the barrel (100) respectively, the barrel (100), the first end cover (200) and the second end cover (300) defining a containing space, an electric core assembly (400) arranged in the containing space, the first end cover (200) being provided with a first connecting structure, the second end cover (300) being provided with a second connecting structure, and the first connecting structure being used for connecting the second connecting structure of the second end cover (300) of another battery monomer.

2. The battery cell of claim 1, wherein, The first connecting structure is a limiting protrusion (201), the second connecting structure is a mounting groove (301), the mounting groove (301) comprises an avoiding groove (3011) and a limiting groove (3012) communicating with the avoiding groove (3011), and the limiting protrusion (201) enters the limiting groove (3012) through the avoiding groove (3011) and can abut against the sidewall of the limiting groove (3012).

3. The battery cell of claim 1, wherein, The first connecting structure is an internal thread, the second connecting structure is an external thread matched with the internal thread, and the internal thread is threadedly matched with the external thread.

4. The battery cell of claim 1, wherein, The first end cover (200) comprises a first main body part (210) and a first annular protrusion (220), the first main body part (210) is arranged at one end of the barrel (100), the first annular protrusion (220) is arranged at one side of the first main body part (210) away from the electric core assembly (400), the first main body part (210) and the first annular protrusion (220) jointly define a first containing groove (202), and the first connecting structure is arranged at the outer circumferential side of the first annular protrusion (220). The second end cover (300) comprises a second main body part (310) and a second annular protrusion (320), the second main body part (310) is arranged at one end of the barrel (100), the second annular protrusion (320) is arranged at one side of the second main body part (310) away from the electric core assembly (400), the second main body part (310) and the second annular protrusion (320) jointly define a second containing groove (302), the second connecting structure is arranged at the inner circumferential side of the second annular protrusion (320), and the first annular protrusion (220) is arranged in the second containing groove (302) of another battery monomer.

5. The battery cell of claim 4, wherein, The first main body part (210) and the first annular protrusion (220) are in an integral structure, and / or the second main body part (310) and the second annular protrusion (320) are in an integral structure.

6. The battery cell of claim 4, wherein, The first annular protrusion (220) is provided with a sealing piece (500) at one end away from the electric core assembly (400), the sealing piece (500) is arranged in extension along the circumferential direction of the first annular protrusion (220), and the sealing piece (500) is used for abutting against the second main body part (310) of another battery monomer.

7. The battery cell of claim 1, wherein, The battery cell further comprises a heat exchange pipe, which is arranged through the first end cover (200) and the second end cover (300), penetrates the accommodating space, and the outer wall of the heat exchange pipe is in contact with the cell assembly (400).

8. The battery cell of claim 7, wherein, The heat exchange pipe comprises a center pipe (610), a first joint (620) and a second joint (630), the first end cover (200) is provided with a first mounting hole matched with the center pipe (610), the second end cover (300) is provided with a second mounting hole matched with the center pipe (610), the first joint (620) is arranged through the first mounting hole and detachably connected with one end of the center pipe (610), and the second joint (630) is arranged through the second mounting hole and detachably connected with the other end of the center pipe (610).

9. The battery cell of claim 8, wherein, Further comprising a first safety valve (640) and a second safety valve (650), the first joint (620) is provided with a first through hole (621) communicating with the center pipe (610), the first safety valve (640) is arranged on the first joint (620) and covers the first through hole (621), the second joint (630) is provided with a second through hole (631) communicating with the center pipe (610), and the second safety valve (650) is arranged on the second joint (630) and covers the second through hole (631).

10. A battery pack characterized by comprising: The battery cell further comprises a heat exchange pipe, which is arranged through the first end cover (200) and the second end cover (300), penetrates the accommodating space, and the outer wall of the heat exchange pipe is in contact with the cell assembly (400).

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