Electric connection chip, electric connection assembly, battery cell and battery module

Abstract

The utility model relates to electric energy storage, and particularly discloses an electric connection sheet, an electric connection assembly, a battery cell and a battery module, the electric connection sheet is used for electrically connecting battery cell pole columns of two adjacent battery cells, the battery cell pole columns are provided with pole column jacks, the electric connection sheet comprises two elastic plugging parts, a first elastic plugging part and a second elastic plugging part, the elastic inserting parts are used for being inserted into the corresponding pole inserting holes and elastically abut against the hole walls of the corresponding pole inserting holes; and the bar piece main body is connected with the two elastic inserting parts. According to the electric connection chip, the electric connection assembly, the battery cell and the battery module provided by the utility model, the problems of high rejection rate and high production cost caused by the fact that the existing chip needs to be welded and fixed with the pole column can be effectively solved.

Description

Technical Field

[0001] The utility model relates to electric energy storage, and in particular to an electrical connection bar, an electrical connection component, a battery core and a battery module. Background Art

[0002] In the field of prismatic lithium-ion battery technology, the cells within a battery module are typically electrically connected via aluminum tabs. These tabs are laser-welded to connect the cell terminals. However, this connection method has the following problems and disadvantages:

[0003] ① Once welding is completed, the battery cell and the battery plate are fused together and cannot be separated. This means that if there is a problem with a certain welding position in the module or battery pack, the entire module or battery pack will no longer be usable and must be scrapped;

[0004] ②The welding process requires specialized laser welding equipment, which increases production costs and complexity.

[0005] The existence of these problems and shortcomings is mainly due to the fact that the connection method between the battery cell and the battery plate in the existing technology is too fixed and cannot be disassembled and reused.

[0006] Therefore, it is necessary to develop an electrical connection bar to solve the problem that the existing bar needs to be welded and fixed to the pole, resulting in a high scrap rate and production cost.

[0007] The above information disclosed in this Background section is included only for enhancement of understanding of the background of the disclosure and therefore it may contain information that does not form the prior art that is currently known to a person of ordinary skill in the art. Utility Model Content

[0008] One purpose of the present invention is to provide an electrical connection bar, an electrical connection assembly, a battery cell and a battery module, which can effectively solve the problem that the existing bar needs to be welded and fixed to the pole, resulting in a high scrap rate and production cost.

[0009] To achieve the above objectives, in a first aspect, the present invention provides an electrical connection bar for electrically connecting the cell poles of two adjacent battery cells, wherein the cell poles have pole sockets, and the electrical connection bar comprises:

[0010] Two elastic plug-in parts, the elastic plug-in parts are used to be inserted into the corresponding pole plug-in holes and elastically abut against the hole walls of the corresponding pole plug-in holes;

[0011] The flap body is connected to the two elastic plug-in parts.

[0012] Optionally, the elastic plug-in portion includes a plurality of spring pieces;

[0013] The spring sheets are arranged at intervals around the central axis of the corresponding pole socket.

[0014] Optionally, a guiding slope is provided on the outer surface of one end of the elastic piece away from the flap body;

[0015] The distance between the guide slope and the central axis gradually decreases in the direction away from the bar body.

[0016] Optionally, the outer surface of the elastic piece close to the end of the flap body is provided with a limiting inclined surface;

[0017] The distance between the limiting inclined surface and the central axis gradually increases in the direction away from the flap body.

[0018] Optionally, the outer surface of the middle position of the spring piece is a cylindrical structure.

[0019] In a second aspect, an electrical connection assembly is provided, comprising any of the above-mentioned electrical connection bars, and two locking nuts provided in one-to-one correspondence with the two elastic plug-in portions of the electrical connection bar;

[0020] Among them, the locking nut is provided with a threaded hole for threaded connection with the battery cell pole, and an avoidance hole for allowing the corresponding elastic plug-in part to be inserted into the threaded hole. The avoidance hole is connected to the threaded hole, and the diameter of the avoidance hole is smaller than the diameter of the threaded hole.

[0021] Optionally, the locking nut is an insulating member.

[0022] In a third aspect, a battery cell is provided, comprising a battery cell body and a battery cell pole protruding from the battery cell body;

[0023] A pole plug hole is recessed at the end surface of the battery cell pole; wherein the pole plug hole is used for plugging and unplugging connection with the elastic plug-in portion of any of the electrical connection bars.

[0024] Optionally, the circumferential surface of the battery cell pole is provided with screw threads.

[0025] In a fourth aspect, a battery module is provided, comprising at least two of the battery cells described above;

[0026] in,

[0027] The battery poles of two adjacent battery cells are electrically connected via any one of the electrical connection bars;

[0028] or,

[0029] The battery poles of two adjacent battery cells are electrically connected via the electrical connection assembly.

[0030] The beneficial effects of the present invention are: providing an electrical connection bar, an electrical connection assembly, a battery cell and a battery module, wherein the electrical connection bar is electrically connected to the battery cell by plugging and unplugging:

[0031] On the one hand, when a component has a problem, the abnormal electrical connection bar or battery cell can be replaced separately without scrapping the entire battery module, thereby reducing the scrap rate;

[0032] On the other hand, using plug-in connections instead of soldered connections eliminates the need for soldering work, thereby reducing production costs and process complexity.

[0033] Therefore, the electrical connection bar, electrical connection assembly, battery cell and battery module provided by the present invention can effectively solve the problem that the existing bar needs to be welded and fixed to the pole, resulting in high scrap rate and production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 A schematic structural diagram of the battery module provided in Example 1;

[0036] Figure 2 This is an exploded diagram of the battery module provided in Example 1;

[0037] Figure 3 A schematic cross-sectional view of the battery module provided in Example 1;

[0038] Figure 4 A schematic diagram of the structure of the electrical connection bar provided in Example 1;

[0039] Figure 5 This is a schematic structural diagram of the battery module provided in Example 2.

[0040] In the picture:

[0041] 1. Battery cell; 101. Battery cell body; 102. Battery cell pole; 1021. Pole socket; 1022. Screw thread;

[0042] 2. Electrical connection components;

[0043] 201, electrical connection bar; 2011, elastic plug portion; 2011a, spring; 2011b, guide slope; 2011c, limit slope; 2011d, cylindrical structure; 2012, bar body;

[0044] 202. Locking nut; 2021. Avoidance hole. DETAILED DESCRIPTION

[0045] References to "embodiments" in this utility model mean that the specific features, structures, or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the utility model. The appearance of the term "embodiment" in various places in the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or relevance to other embodiments. In principle, in this utility model, as long as there are no technical contradictions or conflicts, the various technical features mentioned in the various embodiments can be combined in any manner to form a corresponding implementable technical solution.

[0046] Unless otherwise defined, the technical terms used herein have the same meanings as those generally understood by those skilled in the art to which the present invention belongs. The use of relevant terms herein is only for describing specific embodiments and is not intended to limit the present invention.

[0047] In the description of this utility model, the term "and / or" is used to describe a logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and both A and B exist. In addition, the character " / " in this document generally indicates that the objects before and after are in a logical "or" relationship.

[0048] In the present invention, terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship of quantity, priority or sequence between these entities or operations.

[0049] Without further restrictions, in the present invention, the words "include", "comprise", "have" or other similar expressions used in sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those limited elements, but also other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0050] Consistent with the understanding in the Examination Guidelines, in this utility model, expressions such as "greater than," "less than," and "exceed" are understood to exclude the number itself; expressions such as "above," "below," and "within" are understood to include the number itself. Furthermore, in the description of the embodiments of this utility model, "multiple" means two or more (including two), and similar expressions related to "multiple," such as "multiple groups" and "multiple times," are also understood in this manner, unless otherwise specifically defined.

[0051] In the description of the embodiments of the present invention, the space-related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or position relationship based on the orientation or position relationship shown in the specific embodiments or drawings, and are only for the convenience of describing the specific embodiments of the present invention or facilitating the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, it should not be understood as a limitation on the embodiments of the present invention.

[0052] Unless otherwise expressly specified or limited, in the description of the embodiments of the present invention, the terms "installed", "connected", "connected", "fixed", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be 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 those skilled in the technical field of the present invention, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0053] The utility model provides an electrical connection bar, an electrical connection assembly, a battery cell and a battery module, which are suitable for application scenarios where adjacent battery cells are electrically connected. It can effectively solve the problem that the existing bar needs to be welded and fixed to the pole, resulting in a high scrap rate and production cost.

[0054] Example 1

[0055] See also Figures 1 to 3 This embodiment provides an electrical connection bar 201, an electrical connection component 2, a battery cell 1 and a battery module, wherein the battery module includes at least two battery cells 1, and the battery cell poles 102 of two adjacent battery cells 1 are electrically connected through an electrical connection component 2.

[0056] Specifically, the battery cell 1 includes a battery body 101 and a battery pole 102 protruding from the battery body 101. A pole receptacle 1021 is recessed on the end surface of the battery pole 102, and a screw thread 1022 is provided on the circumferential surface of the battery pole 102. Accordingly, the electrical connection assembly 2 includes an electrical connection tab 201 for electrically connecting the two battery poles 102, and two locking nuts 202 corresponding to the two battery poles 102.

[0057] The electrical connection tab 201 includes two elastic plug-in portions 2011 and a tab body 2012 connecting the two elastic plug-in portions 2011. The elastic plug-in portions 2011 are used to be inserted into the corresponding pole plug-in holes 1021 and elastically abut against the hole walls of the corresponding pole plug-in holes 1021.

[0058] Correspondingly, the two locking nuts 202 are provided in a one-to-one correspondence with the two elastic plug-in portions 2011 of the electrical connection tab 201. The locking nuts 202 are provided with threaded holes for threaded connection with the battery cell posts 102, and with clearance holes 2021 for inserting the corresponding elastic plug-in portions 2011 into the threaded holes. Specifically, the clearance holes 2021 communicate with the threaded holes and have a smaller diameter than the threaded holes, allowing the elastic plug-in portions 2011 to be inserted into the corresponding post receptacles 1021.

[0059] When two battery cells 1 need to be electrically connected to each other, the electrical connection bar 201, electrical connection assembly 2, battery cell 1, and battery module provided in this embodiment are configured to first tighten the two locking nuts 202 onto the corresponding battery cell posts 102. The two elastic plug-in portions 2011 are then placed onto the corresponding avoidance holes 2021. The electrical connection bar 201 is then pressed downward, so that the elastic plug-in portions 2011 pass through the corresponding avoidance holes 2021, extend into the corresponding post insertion holes 1021, and abut against the wall of the post insertion holes 1021.

[0060] When the electrical connection bar 201 needs to be removed, there are two methods: one is to directly use a tool to pull out the elastic plug-in part 2011 of the electrical connection bar 201 from the battery pole 102, but this solution has certain safety hazards; the other is to reversely twist the locking nut 202 so that the locking nut 202 slowly pushes the electrical connection bar 201 upward, and then pulls the elastic plug-in part 2011 out of the pole socket 1021. This method is slower but safer.

[0061] The electrical connection bar 201, electrical connection assembly 2, battery cell 1 and battery module provided in this embodiment are electrically connected to the battery cell 1 by plugging and unplugging. On the one hand, when a problem occurs in a component, the abnormal electrical connection bar 201 or battery cell 1 can be replaced separately without scrapping the entire battery module, thereby reducing the scrap rate. On the other hand, plug-in connection is used instead of welding connection, and there is no need to perform welding operations, thereby reducing production costs and process complexity.

[0062] Therefore, the electrical connection bar 201, electrical connection assembly 2, battery cell 1 and battery module provided by the present invention can effectively solve the problem that the existing bar needs to be welded and fixed to the pole, resulting in high scrap rate and production cost.

[0063] See also Figure 2 and Figure 4 The specific shape of the spring piece 2011a is introduced below. It should be noted that the "outer surface of the spring piece 2011a" mentioned below specifically refers to the surface of the spring piece 2011a on the side away from the central axis of the pole socket 1021.

[0064] The elastic plug-in portion 2011 includes a plurality of spring clips 2011a; each spring clip 2011a is spaced apart and arranged around the central axis of the corresponding pole receptacle 1021, giving the elastic plug-in portion 2011 a generally tubular shape. When the elastic plug-in portion 2011 is not inserted into the pole receptacle 1021, each spring clip 2011a is vertically extended downward relative to the horizontal tab body 2012. In this state, the distance between adjacent spring clips 2011a is relatively large, and the outer diameter of the elastic plug-in portion 2011 is slightly larger than the inner diameter of the pole receptacle 1021.

[0065] After the elastic plug-in portion 2011 is inserted into the pole plug-in hole 1021, each spring piece 2011a is supported by the hole wall of the pole plug-in hole 1021 and tilted and retracted toward the central axis. At this time, the spacing between two adjacent spring pieces 2011a is reduced. Under the action of the elastic potential energy of the spring piece 2011a itself, each spring piece 2011a is pressed outward against the hole wall of the pole plug-in hole 1021, thereby achieving a reliable electrical connection between the battery cell pole 102 and each spring piece 2011a.

[0066] Therefore, after the two elastic plug-in parts 2011 are respectively inserted into the corresponding pole plug holes 1021, the two adjacent battery cells can be electrically connected.

[0067] Optionally, a guide slope 2011b is provided on the outer surface of the end of the spring piece 2011a away from the flap body 2012, and a limiting slope 2011c is provided on the outer surface of the end of the spring piece 2011a close to the flap body 2012.

[0068] Specifically, the distance between the guide slope 2011b and the central axis gradually decreases in the direction away from the tab body 2012, so that the elastic plug-in portion 2011, at the end away from the tab body 2012, has a tapered structure with its outer diameter gradually decreasing in the direction away from the tab body 2012. The design of the guide slope 2011b can reduce the difficulty of aligning the elastic plug-in portion 2011 with the pole receptacle 1021, making it easier to press the elastic plug-in portion 2011 into the pole receptacle 1021.

[0069] Optionally, the distance between the limiting inclined surface 2011c and the central axis gradually increases in a direction away from the tab body 2012, so that the elastic plug portion 2011, from one end near the tab body 2012, forms a gradually expanding structure with an outer diameter gradually increasing in a direction away from the tab body 2012. Accordingly, the diameter of the avoidance hole 2021 is slightly smaller than the diameter of the cylindrical structure 2011d, so that the locking nut 202 is retained on the limiting inclined surface 2011c, allowing it to move to a certain extent relative to the elastic plug portion 2011 to connect with the battery cell terminal 102, while also being fixed to the electrical connection tab 201 to prevent loss.

[0070] In this embodiment, the locking nut 202 is an insulating member. Besides being used to safely remove the elastic plug-in portion 2011 from the pole insertion hole 1021, the locking nut 202 can also cover the battery pole 102, reducing the risk of electric shock caused by accidental contact with the battery pole 102, thereby improving safety.

[0071] Optionally, the outer surface of the middle portion of the spring piece 2011a is a cylindrical structure 2011d, so as to maximize the contact area between the spring piece 2011a and the wall of the pole plug hole 1021, thereby reducing the contact resistance.

[0072] In summary, the electrical connection bar 201, the electrical connection assembly 2, the battery cell 1, and the battery module provided in this embodiment have the following advantages:

[0073] ① The electrical connection bar 201 is connected to the battery cell 1 by plugging and unplugging. When a single component fails, the abnormal electrical connection bar 201 or battery cell 1 can be replaced separately without scrapping the entire battery module, thereby effectively reducing the scrap rate of the battery module.

[0074] ② Using plug-in connections instead of traditional welding connections eliminates the need for welding equipment, reducing production costs and process complexity;

[0075] ③ The locking nut 202 not only assists in the disassembly of the electrical connection bar 201, improving safety during disassembly, but also covers the battery terminal 102 during disassembly, reducing the risk of electric shock caused by accidental contact with the battery terminal 102, further improving safety performance;

[0076] ④ The spring piece 2011a of the elastic plug-in portion 2011 is designed so that after being inserted into the pole plug hole 1021, it can cling to the hole wall to achieve reliable electrical connection;

[0077] ⑤ The design of the guiding inclined surface 2011b and the limiting inclined surface 2011c on the spring piece 2011a reduces the difficulty of aligning the elastic plug-in portion 2011 with the pole plug hole 1021, facilitates installation, and ensures stable limiting of the locking nut 202.

[0078] Example 2

[0079] See also Figure 5 This embodiment provides an electrical connection bar 201, a battery cell 1 and a battery module, wherein the battery module includes at least two battery cells 1, and the battery cell poles 102 of two adjacent battery cells 1 are electrically connected through an electrical connection bar 201.

[0080] The battery module provided in this embodiment differs from that in embodiment 1 in that:

[0081] In this embodiment, the locking nut is eliminated and the electrical connection bar 201 is directly plugged in and out to complete the assembly and disassembly operations between the electrical connection bar 201 and the battery cell pole 102 .

[0082] On the basis of Example 1, the features not explained in this embodiment adopt the explanation in Example 1 and have the same beneficial effects and functions, and will not be described again here.

[0083] Finally, it should be noted that although the above embodiments have been described in the specification and drawings of this application, this does not limit the scope of patent protection of this application. All technical solutions generated by replacing or modifying equivalent structures or equivalent processes based on the essential concepts of this application using the contents recorded in the specification and drawings of this application, as well as directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are included in the scope of patent protection of this application.

Claims

1. An electrical connection bar, used for electrically connecting the cell poles (102) of two adjacent cell poles, wherein the cell poles (102) have pole sockets (1021), characterized in that: include: Two elastic plug-in parts (2011), the elastic plug-in parts (2011) being used to be inserted into the corresponding pole plug holes (1021) and elastically abut against the hole walls of the corresponding pole plug holes (1021); A flap body (2012), wherein the flap body (2012) is connected to the two elastic plug-in parts (2011).

2. The electrical connection bar according to claim 1, characterized in that: The elastic plug-in portion (2011) comprises a plurality of spring pieces (2011a); The spring pieces (2011a) are arranged at intervals around the central axis of the corresponding pole socket (1021).

3. The electrical connection bar according to claim 2, characterized in that: The outer surface of the elastic piece (211a) at one end away from the bar body (212) is provided with a guiding inclined surface (211b); The distance between the guiding inclined surface (2011b) and the central axis gradually decreases in the direction away from the flap body (2012).

4. The electrical connection bar according to claim 2, characterized in that: The outer surface of one end of the spring piece (2011a) close to the bar body (2012) is provided with a limiting inclined surface (2011c); The distance between the limiting inclined surface (2011c) and the central axis gradually increases in the direction away from the flap body (2012).

5. The electrical connection bar according to claim 2, characterized in that: The outer surface at the middle position of the spring piece (2011a) is a cylindrical structure (2011d).

6. An electrical connection assembly, characterized in that: Comprising the electrical connection bar (201) according to any one of claims 1 to 5, and two locking nuts (202) arranged in one-to-one correspondence with the two elastic plug-in portions (211) of the electrical connection bar (201); The locking nut (202) is provided with a threaded hole for threaded connection with the battery pole (102), and a relief hole (2021) for allowing the corresponding elastic plug-in portion (2011) to be inserted into the threaded hole, the relief hole (2021) being connected to the threaded hole, and the diameter of the relief hole (2021) is smaller than the diameter of the threaded hole.

7. The electrical connection assembly according to claim 6, wherein: The locking nut (202) is an insulating part.

8. A battery cell, characterized in that: It comprises a battery cell body (101) and a battery cell pole (102) protruding from the battery cell body (101); A pole plug hole (1021) is recessed at the end surface of the battery cell pole (102); wherein the pole plug hole (1021) is used for plugging and unplugging with the elastic plug-in portion (2011) of the electrical connection bar (201) according to any one of claims 1 to 5.

9. The battery cell according to claim 8, characterized in that The circumferential surface of the battery cell pole (102) is provided with screw threads (1022).

10. A battery module, characterized in that: Comprising the battery cell (1) according to claim 8 or 9; in, The cell poles (102) of two adjacent cell poles (1) are electrically connected via the electrical connection bar (201) according to any one of claims 1 to 5; or, The cell poles (102) of two adjacent cell poles (1) are electrically connected via the electrical connection assembly (2) according to claim 6 or 7.

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