Battery cell assembly and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cell assembly and a battery pack, the battery cell assembly comprises at least two single battery cells, each single battery cell comprises a battery cell body, and a first pole and a second pole which are arranged on at least one side surface of the battery cell body; one of the first pole and the second pole is sunken to form a groove part, the other one partially protrudes to form a convex part, and the groove part is matched with the convex part in an inserting manner so as to connect two adjacent single battery cells. According to the battery cell assembly provided by the utility model, one of the first pole and the second pole is sunken to form the groove part, the other one partially protrudes to form the protruding part, and the groove part is matched with the protruding part in an inserting manner, so that two adjacent single battery cells can be connected, a connecting sheet does not need to be independently arranged, the number of parts is reduced, and the cost is reduced. The structure complexity of the battery is reduced, two adjacent single battery cells can be connected more tightly, the weight of the battery module is reduced, and the energy density is improved.

Description

Technical Field

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

[0002] As a power source, batteries are widely used in social life. As the mileage of new energy vehicles continues to increase, the energy density of battery packs is also increasing.

[0003] In the related art, after the battery cells are stacked to form a module, the circuit conduction between the battery cells is often achieved through connecting sheets. This form increases the cost of the battery pack and also increases the weight of the module and the battery pack as a whole, resulting in the inability to effectively improve the energy density. Utility Model Content

[0004] In view of this, the utility model provides a battery cell assembly and a battery pack to solve the problem that the connection between battery cells through connecting sheets will lead to an increase in the overall weight of the battery pack and a low energy density.

[0005] In a first aspect, the utility model provides a battery core assembly, comprising:

[0006] At least two single cells, each of which comprises a cell body, and a first pole and a second pole disposed on at least one side of the cell body;

[0007] One of the first pole and the second pole is recessed to form a groove portion, and the other part is partially protruded to form a convex portion, and the groove portion and the convex portion are plugged and matched to connect two adjacent single cells.

[0008] Beneficial effect: In the battery cell assembly provided by the embodiment of the utility model, one of the first pole and the second pole is recessed to form a groove portion, and the other partially protrudes to form a convex portion. By plugging the groove portion and the convex portion into engagement, two adjacent single cells can be connected, thereby eliminating the need to separately set up a connecting plate, reducing the number of parts, and reducing the structural complexity of the battery. At the same time, the connection between the two adjacent single cells can be made closer, thereby reducing the weight of the battery module, improving the energy density, and reducing the cost of the battery pack.

[0009] In an optional embodiment, the first pole includes a first pole base, one side of the first pole base is connected to the battery cell body, and the side of the first pole base facing away from the battery cell body is recessed toward the side close to the battery cell body to form a groove portion; the cross-sectional area of ​​the groove portion facing away from the battery cell body is smaller than the cross-sectional area of ​​the groove portion close to the battery cell body.

[0010] In an optional embodiment, the second pole includes a second pole base, one side of the second pole base is connected to the battery cell body, and a protrusion is formed on the side of the second pole base away from the battery cell body; the cross-sectional area of ​​the protrusion away from the second pole base is larger than the cross-sectional area of ​​the protrusion close to the second pole base.

[0011] In an optional embodiment, the first pole and the second pole are arranged on the same side of the battery cell body.

[0012] In an optional implementation, the first pole and the second pole are respectively arranged on different sides of the battery cell body.

[0013] In an optional embodiment, the angle between the side wall and the bottom wall of the groove portion of the first pole base is A, the angle between the side surface of the protrusion and the top surface of the second pole base is B; and 0°<A=B<90° is satisfied.

[0014] Beneficial effect: By setting the angle A and the angle B to the same angle, the insertion of the groove part and the protrusion part can be facilitated, ensuring that the two can be in close contact after being combined, ensuring effective contact of the poles, and avoiding the occurrence of virtual connection or short circuit.

[0015] In an optional embodiment, the distance between the top surface of the second pole base and the surface of the corresponding battery cell body is H1; the distance between the bottom wall of the groove portion of the first pole base and the surface of the corresponding battery cell body is H3, and H1=H3 is satisfied;

[0016] And / or, the distance between the top surface of the protrusion and the top surface of the second pole base is H2; the distance between the bottom wall of the groove portion of the first pole base and the top surface of the first pole base is H4, and H2=H4 is satisfied.

[0017] Beneficial effect: By making H1=H3 and H2=H4, after two single cells arranged opposite to each other are connected, the butt joint surfaces can be ensured to be parallel. Furthermore, multiple single cells form a first cell layer and a second cell layer arranged opposite to each other, thereby ensuring the parallelism of the first cell layer and the second cell layer, making reasonable use of space, and avoiding space waste inside the battery pack.

[0018] In a second aspect, the utility model further provides a battery pack, comprising a cell assembly as described above, wherein the cell assembly comprises a plurality of single cells, and the plurality of single cells form a first cell layer and a second cell layer which are arranged opposite to each other.

[0019] Beneficial effects: By dividing into two layers, the specifications of the single cells in each layer are the same, while the specifications of the single cells in different layers can be different, so that it is convenient to match the battery capacity, battery thickness and battery voltage according to actual needs. In addition, the first cell layer and the second cell layer are arranged oppositely, and the circuit components, battery detection components, etc. can be arranged in the area between the first cell layer and the second cell layer, so as to reasonably utilize the space, avoid occupying too much Z-direction height, and improve the battery energy density.

[0020] In an optional embodiment, one of the single cells in the first battery layer is respectively connected to two single cells in the second battery layer, and one of the single cells in the second battery layer is respectively connected to two single cells in the first battery layer.

[0021] Beneficial effect: By adopting this connection method, the single cells of the first battery layer and the single cells of the second battery layer can be arranged alternately, and the connection is achieved by the groove part and the protrusion part, so that the connected battery pack is more secure and avoids shaking.

[0022] In an optional embodiment, at least a partial area of ​​a projection of the first battery core layer toward the second battery core layer does not overlap with the second battery core layer to form a clearance area, and / or at least a partial area of ​​a projection of the second battery core layer toward the first battery core layer does not overlap with the first battery core layer to form a clearance area;

[0023] The clearance area is suitable for forming a receiving space for an external element.

[0024] Beneficial effect: By forming a clearance area in the area where the first battery core layer and the second battery core layer do not overlap, external components such as cooling pipes and conductive bars can be arranged in the clearance area, so as to rationally utilize the space inside the battery pack and improve space utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of a single battery cell of the utility model;

[0027] Figure 2 It is a schematic diagram of the assembly state of multiple battery cells of the utility model;

[0028] Figure 3 It is a layered schematic diagram of the battery cell assembly of the utility model;

[0029] Figure 4 This is an angled schematic diagram of a single battery cell of the utility model;

[0030] Figure 5 It is a schematic diagram of the dimensions of a single battery cell of the utility model.

[0031] Description of reference numerals:

[0032] 10. Single cell; 1. Cell body; 2. First pole; 21. Groove; 22. First pole base; 3. Second pole; 31. Raised portion; 32. Second pole base; 4. Clearance area; 100. First cell layer; 200. Second cell layer. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0034] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, 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 therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] Combine the following Figures 1 to 5 , describing an embodiment of the utility model.

[0038] According to an embodiment of the present utility model, on the one hand, a battery cell assembly is provided, comprising:

[0039] At least two single cells 10, each single cell 10 comprises a cell body 1, and a first pole 2 and a second pole 3 disposed on at least one side of the cell body 1;

[0040] One of the first pole 2 and the second pole 3 is recessed to form a groove portion 21 , and the other part is partially protruded to form a convex portion 31 . The groove portion 21 and the convex portion 31 are plugged and matched to connect two adjacent single cells 10 .

[0041] Each single battery cell 10 includes a battery cell body 1, on which a first pole 2 and a second pole 3 are formed. The polarities of the first pole 2 and the second pole 3 are opposite, for example, the first pole 2 is a positive pole and the second pole 3 is a negative pole; or, the first pole 2 is a negative pole and the second pole 3 is a positive pole.

[0042] In the battery cell assembly provided by the embodiment of the utility model, one of the first pole 2 and the second pole 3 is recessed to form a groove portion 21, and the other partially protrudes to form a convex portion 31. By plugging the groove portion 21 and the convex portion 31 into each other, two adjacent single battery cells 10 can be connected, thereby eliminating the need to separately set a connecting plate, reducing the number of parts, and reducing the structural complexity of the battery. At the same time, the two adjacent single battery cells 10 can be connected more closely, reducing the weight of the battery module, improving the energy density, and reducing the cost of the battery pack.

[0043] When the groove portion 21 and the protrusion portion 31 are plugged in, they can be a transition fit or an interference fit, thereby ensuring that the first pole 2 and the second pole 3 correspondingly arranged on the two single cells 10 are tightly connected to avoid a virtual connection.

[0044] Additionally, after the groove portion 21 and the protrusion portion 31 are plugged into each other, laser welding may be performed at the interface to ensure that the two single cells 10 are securely connected to avoid loosening.

[0045] Combination Figure 2As shown, the second pole 3 of the first single cell 10 is connected to the first pole 2 of the second single cell 10 arranged oppositely, the second pole 3 of the second single cell 10 is connected to the first pole 2 of the third single cell 10 arranged oppositely, the second pole 3 of the third single cell 10 is connected to the first pole 2 of the fourth single cell 10 arranged oppositely, and so on. Among them, the first single cell 10 and the third single cell 10 are arranged side by side, and the second single cell 10 and the fourth single cell 10 are arranged side by side. Specifically, the first single cell 10 and the third single cell 10 can be located in the first cell layer 100, and the second single cell 10 and the fourth single cell 10 can be located in the second cell layer 200; the first cell layer 100 and the second cell layer 200 are arranged oppositely, and the side of the single cell 10 of the first cell layer 100 provided with the pole faces the side of the single cell 10 of the second cell layer 200 provided with the pole.

[0046] In some embodiments, in combination Figure 1 As shown, the first pole 2 includes a first pole base 22, one side of the first pole base 22 is connected to the battery cell body 1, and the side of the first pole base 22 away from the battery cell body 1 is recessed toward the side close to the battery cell body 1 to form a groove portion 21; the cross-sectional area of ​​the groove portion 21 on the side away from the battery cell body 1 is smaller than the cross-sectional area of ​​the groove portion 21 on the side close to the battery cell body 1.

[0047] In some embodiments, in combination Figure 1 As shown, the second pole 3 includes a second pole base 32, one side of the second pole base 32 is connected to the battery cell body 1, and a protrusion 31 is formed on the side of the second pole base 32 away from the battery cell body 1; the cross-sectional area of ​​the protrusion 31 away from the second pole base 32 is larger than the cross-sectional area of ​​the protrusion 31 close to the second pole base 32.

[0048] The protrusion 31 and the second pole base 32 are integrally formed.

[0049] Optionally, the first pole 2 and the second pole 3 are made of the same material.

[0050] In some embodiments, in combination Figure 1 As shown, the first pole 2 and the second pole 3 are arranged on the same side of the battery cell body 1 .

[0051] Taking a square shell battery cell as an example, the battery cell body 1 is surrounded by six walls, and the first pole 2 and the second pole 3 are arranged on the same wall of the battery cell body 1, for example, the battery cell body 1 may be provided with a wall with a cover plate.

[0052] As a variation, the first pole 2 and the second pole 3 are respectively arranged on different sides of the cell body 1. For example, the first pole 2 is arranged on the top surface of the cell body 1, and the second pole 3 is arranged on the side of the cell body 1; for another example, the first pole 2 and the second pole 3 are respectively arranged on two opposite sides of the cell body 1. By arranging the first pole 2 and the second pole 3 on different sides of the cell body 1, different layout forms can be achieved as needed.

[0053] In some embodiments, in combination Figure 4 As shown, the included angle between the side wall and the bottom wall of the groove portion 21 of the first pole base 22 is A, and the included angle between the side surface of the protrusion 31 and the top surface of the second pole base 32 is B; and 0°<A=B<90° is satisfied.

[0054] The groove portion 21 is configured as a trapezoid, and correspondingly, the protrusion portion 31 is also configured as an inverted trapezoid. By setting the angle A and the angle B to be the same, the insertion of the groove portion 21 and the protrusion portion 31 can be facilitated, ensuring that the two can be in close contact after being combined, ensuring effective contact of the pole, and avoiding the occurrence of virtual connection or short circuit.

[0055] In some embodiments, in combination Figure 5 As shown, the distance between the top surface of the second pole base 32 and the surface of the corresponding cell body 1 is H1; the distance between the bottom wall of the groove portion 21 of the first pole base 22 and the surface of the corresponding cell body 1 is H3, and H1=H3 is satisfied;

[0056] And / or, the distance between the top surface of the protrusion 31 and the top surface of the second pole base 32 is H2; the distance between the bottom wall of the first pole base 22 in the groove portion 21 and the top surface of the first pole base 22 is H4, and H2=H4 is satisfied.

[0057] By making H1=H3 and H2=H4, after the two single cells 10 are connected, the butt joint surfaces can be parallel. Furthermore, the multiple single cells 10 form a first cell layer 100 and a second cell layer 200 that are arranged opposite to each other, thereby ensuring the parallelism of the first cell layer 100 and the second cell layer 200, making reasonable use of space, and avoiding space waste inside the battery pack.

[0058] According to an embodiment of the present invention, on the other hand, a battery pack is provided, including a battery cell assembly as described above, wherein the battery cell assembly includes a plurality of single battery cells 10 , and the plurality of single battery cells 10 form a first battery cell layer 100 and a second battery cell layer 200 that are oppositely arranged.

[0059] By dividing into two layers, the specifications and models of the single cells 10 in each layer are the same, while the specifications and models of the single cells 10 in different layers can be different, so that it is convenient to match the battery capacity, battery thickness and battery voltage according to actual needs.

[0060] For example, the bottom surface of the first battery cell layer 100 contacts the bottom surface of the battery case, and the top surface of the second battery cell layer 200 contacts the cover of the case, so that the specifications and models of the single battery cells 10 in different layers can be reasonably set according to the capacity, size and design requirements of the battery case.

[0061] In addition, the first battery layer 100 and the second battery layer 200 are arranged opposite to each other, and circuit elements, battery detection elements, etc. can be arranged in the area between the first battery layer 100 and the second battery layer 200, so as to reasonably utilize the space, avoid occupying too much Z-direction height, and improve the battery energy density.

[0062] In the battery pack provided by the embodiment of the utility model, one of the first pole 2 and the second pole 3 is recessed to form a groove portion 21, and the other partially protrudes to form a convex portion 31. By plugging the groove portion 21 and the convex portion 31 together, two adjacent single cells 10 can be connected, thereby eliminating the need to separately set a connecting plate, reducing the number of parts, and reducing the structural complexity of the battery. At the same time, the two adjacent single cells 10 can be connected more closely, reducing the weight of the battery module, improving the energy density, and reducing the cost of the battery pack.

[0063] In some embodiments, in combination Figure 3 As shown, one of the single cells 10 of the first battery layer 100 is connected to two single cells 10 of the second battery layer 200 , and one of the single cells 10 of the second battery layer 200 is connected to two single cells 10 of the first battery layer 100 .

[0064] By adopting this connection method, the single cells 10 of the first cell layer 100 and the single cells 10 of the second cell layer 200 can be arranged alternately, and the connection is achieved by the groove part 21 and the protrusion part 31, so that the connected battery pack is more secure and avoids shaking.

[0065] In some embodiments, in combination Figure 3 As shown, at least a portion of the projection of the first battery layer 100 toward the second battery layer 200 does not overlap with the second battery layer 200 to form a clearance area 4, and / or, at least a portion of the projection of the second battery layer 200 toward the first battery layer 100 does not overlap with the first battery layer 100 to form a clearance area 4;

[0066] The clearance area 4 is suitable for forming a receiving space for external elements.

[0067] By forming a clearance area 4 in the area where the first battery core layer 100 and the second battery core layer 200 do not overlap, external components such as cooling pipes and conductive bars can be arranged in the clearance area 4, so as to reasonably utilize the space inside the battery pack and improve space utilization.

[0068] Obviously, the above embodiments are only examples for clear explanation, and are not intended to limit the implementation methods. Although the embodiments of the present utility model are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations are all within the scope defined by the present utility model.

Claims

1. A battery cell assembly, characterized in that: include: At least two single cells (10), each of the single cells (10) comprising a cell body (1), and a first pole (2) and a second pole (3) arranged on at least one side surface of the cell body (1); One of the first pole (2) and the second pole (3) is recessed to form a groove portion (21), and the other part is partially protruded to form a convex portion (31), and the groove portion (21) and the convex portion (31) are plugged into each other to connect two adjacent single cells (10).

2. The battery cell assembly according to claim 1, characterized in that: The first pole (2) comprises a first pole base (22), one side of the first pole base (22) is connected to the battery cell body (1), and the side of the first pole base (22) facing away from the battery cell body (1) is recessed toward the side close to the battery cell body (1) to form the groove portion (21); the cross-sectional area of ​​the side of the groove portion (21) facing away from the battery cell body (1) is smaller than the cross-sectional area of ​​the side of the groove portion (21) close to the battery cell body (1).

3. The battery cell assembly according to claim 2, characterized in that: The second pole (3) comprises a second pole base (32); one side of the second pole base (32) is connected to the battery cell body (1); the side of the second pole base (32) facing away from the battery cell body (1) is formed with the protrusion (31); the cross-sectional area of ​​the protrusion (31) on the side away from the second pole base (32) is larger than the cross-sectional area of ​​the protrusion (31) on the side close to the second pole base (32).

4. The battery core assembly according to claim 1, characterized in that: The first pole (2) and the second pole (3) are arranged on the same side of the battery cell body (1).

5. The battery core assembly according to claim 1, characterized in that: The first pole (2) and the second pole (3) are respectively arranged on different sides of the battery cell body (1).

6. The battery core assembly according to claim 3, characterized in that: The angle between the side wall and the bottom wall of the groove portion (21) of the first pole base (22) is A, and the angle between the side surface of the protrusion (31) and the top surface of the second pole base (32) is B; and 0°<A=B<90° is satisfied.

7. The battery cell assembly according to claim 3, characterized in that: The distance between the top surface of the second pole base (32) and the corresponding surface of the battery cell body (1) is H1; the distance between the bottom wall of the first pole base (22) in the groove portion (21) and the corresponding surface of the battery cell body (1) is H3, and H1=H3 is satisfied; And / or, the distance between the top surface of the protrusion (31) and the top surface of the second pole base (32) is H2; the distance between the bottom wall of the first pole base (22) in the groove portion (21) and the top surface of the first pole base (22) is H4, and H2=H4 is satisfied.

8. A battery pack, characterized in that: It comprises a battery cell assembly as claimed in any one of claims 1 to 7, wherein the battery cell assembly comprises a plurality of single battery cells (10), and the plurality of single battery cells (10) form a first battery cell layer (100) and a second battery cell layer (200) which are arranged opposite to each other.

9. The battery pack according to claim 8, characterized in that: One of the single cells (10) of the first cell layer (100) is respectively connected to two of the single cells (10) of the second cell layer (200), and one of the single cells (10) of the second cell layer (200) is respectively connected to two of the single cells (10) of the first cell layer (100).

10. The battery pack according to claim 8, characterized in that: At least a portion of the projection of the first battery core layer (100) toward the second battery core layer (200) does not overlap with the second battery core layer (200) to form a clearance area (4), and / or at least a portion of the projection of the second battery core layer (200) toward the first battery core layer (100) does not overlap with the first battery core layer (100) to form a clearance area (4); The clearance area (4) is suitable for forming a receiving space for external elements.

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