A battery connection structure, battery module and battery pack

Abstract

The present invention is applicable to the field of battery connection technology, and provides a battery connection structure, a battery module and a battery pack. The connection structure includes: an electrical connection piece and a battery cell. The electrical connection piece includes a main body and an electrical connection part. The main body and the battery cell are connected by an adhesive. The electrical connection part is electrically connected to the pole of the battery cell. The above-mentioned battery connection structure has a reliable connection and a simple operation process. It does not require traditional laser welding or fasteners to achieve electrical connection between the electrical connection piece and the battery. It does not require welding tool positioning, welding machines, or numerous fasteners. The production equipment cost is low and the production efficiency is high. In the later maintenance, replacement or cascade utilization of the battery, no destructive disassembly is required. During the disassembly and replacement of the battery cell, the integrity of all components can be guaranteed, which improves the feasibility of cascade utilization of the battery cell.

Description

Technical Field

[0001] The present invention relates to the technical field of battery connection, and in particular to a battery connection structure, a battery module and a battery pack. Background Art

[0002] Prior art methods for achieving electrical connections between battery cells involve laser welding or fasteners between the electrical connector and the battery module. For laser welding, the areas where the positive and negative electrodes connect to the connector are typically made of pure aluminum for ease of welding. The negative electrode is typically made of copper and aluminum welded together using processes such as friction stir welding, CMT welding, or molecular diffusion welding.

[0003] The problems are: 1) Although fastener connections offer high flexibility, they require many fasteners, resulting in a complex process and a heavy assembled battery module. 2) Laser welding requires very high surface finish on the pole, requiring precision machining of the pole, resulting in high processing costs. Furthermore, the negative pole requires copper-aluminum composite welding, which is difficult, expensive, and has poor reliability and post-weld current capacity. Furthermore, laser welding prevents secondary disassembly, maintenance, and reuse of batteries, hindering energy recovery and after-sales repairs. Summary of the Invention

[0004] In order to solve the above problems, the first aspect of the present application provides a battery connection structure, which includes: an electrical connection plate and a battery cell, wherein the electrical connection plate includes a main body and an electrical connection portion; the main body and the battery cell are connected by an adhesive; and the electrical connection portion is electrically connected to the pole of the battery cell.

[0005] When forming a battery module, multiple battery cells need to be connected in series or parallel. The usual practice is to use electrical connecting sheets as a medium to electrically connect the electrical connecting sheets to the poles of the battery cells to be connected in series or parallel.

[0006] In the above solution, a structure is provided for electrically connecting the electrical connection piece to the poles of the battery cells to be connected in series or parallel. Specifically:

[0007] The electrical connection piece includes a main body and an electrical connection piece; the main body and the electrical connection piece can be set as one piece, so that the electrical connection piece is directly processed using an integrated molding process; the main body and the electrical connection piece can also be set as separate pieces, such as processing the main body and the electrical connection piece separately, and the two can be detachably connected.

[0008] Of course, multiple electrical connection parts can be provided on one electrical connection sheet, so that electrical connection between multiple battery cells can be achieved through one electrical connection sheet.

[0009] An electrical connection is made between the electrical connection portion of the electrical connection sheet and the pole of the battery cell. The electrical connection here can be achieved by directly contacting the electrical connection portion with the pole of the battery cell to achieve electrical connection between the two. Alternatively, the electrical connection portion and the pole of the battery cell can be bonded together with a conductive adhesive to achieve electrical connection between the two. Alternatively, other conductive media may be present between the electrical connection portion and the pole of the battery cell to achieve electrical connection between the two.

[0010] The main body and the battery cell are connected by an adhesive. This adhesive is intended to achieve a structural connection between the electrical connection piece and the battery cell, preventing relative movement between the electrical connection piece and the battery cell, which could affect the electrical connection between the two. The adhesive can be structural adhesive, double-sided tape, or other adhesive-like materials, as long as it can achieve structural relative fixation between the two objects.

[0011] It should be noted that the core of the above-mentioned method for achieving structural connection between the main body and the battery cell is that the main body and the battery cell are bonded together using an adhesive. As for the specific bonding location, the main body can be bonded to the battery cell pole to achieve structural connection between the two, or the main body can be bonded to the non-pole portion of the battery cell (such as the top cover, the main body of the battery cell, etc.) to achieve structural connection between the two.

[0012] It is understood that whether the structural connection between the main body and the battery cell terminal is achieved by bonding the main body to the battery cell top cover (or the main body of the battery cell), the adhesive must be made of an insulating material. After the adhesive cures, a certain thickness is formed in the structural connection area between the main body and the battery cell to prevent short circuits.

[0013] The above-mentioned battery connection structure has reliable connection and simple operation process. It does not require traditional laser welding or fasteners to achieve electrical connection between the electrical connecting plate and the battery. It does not require welding tooling positioning, does not require a welding machine, and does not require numerous fasteners. The production equipment cost is low and the production efficiency is high. In the later maintenance, replacement or cascade utilization of the battery, no destructive disassembly is required. During the disassembly and replacement of the battery unit, the integrity of all components can be guaranteed, thereby improving the feasibility of the cascade utilization of the battery unit.

[0014] Furthermore, the electrical connection portion includes an electrical connection contact finger, and the electrical connection contact finger is electrically connected to the pole;

[0015] The above solution provides a specific form of the electrical connection portion. The electrical connection portion is an electrical connection contact finger, which is connected to the main body via a contact finger connection portion. Contact gaps can be provided between the multiple contact fingers. The electrical connection contact finger is abutted against the battery cell terminal, thereby achieving electrical connection between the two.

[0016] and / or the electrical connection portion includes an electrical connection contact, the electrical connection contact being electrically connected to the pole;

[0017] The above solution provides another specific form of the electrical connection portion. Electrical connection contacts are provided on the electrical connection portion, and electrical connection between the electrical connection contacts and the battery cell poles is achieved through point contact between the electrical connection contacts and the battery cell poles. The number of electrical connection contacts can be one or more based on actual current flow requirements, and is not limited here.

[0018] and / or the electrical connection portion includes an electrical connection contact ring, the electrical connection contact ring being electrically connected to the pole;

[0019] In the above solution, another specific form of the electrical connection portion is provided, wherein an electrical connection contact ring is provided on the electrical connection portion, and the electrical connection contact ring is in line contact with the pole of the battery cell.

[0020] Specifically, the electrical contact ring can be a fully enclosed ring or a semi-enclosed ring; the contact ring can be circular, square or any other polygonal shape, as long as there is line contact with the pole, and there is no limitation here.

[0021] And / or the electrical connection portion includes an electrical connection contact spring, and the electrical connection contact spring is electrically connected to the pole.

[0022] The above solution provides another specific form of the electrical connection portion. The electrical connection portion is provided with an electrical connection spring. The electrical connection spring is stamped from sheet metal and includes a spring leaf and a welding portion. The spring leaf makes line or surface contact with the battery cell terminal. The welding portion can be welded to the main body by laser welding, electromagnetic pulse welding, ultrasonic welding, resistance welding, or other methods.

[0023] It is understood that an electrical connection sheet may include one or more of the several types of electrical connection portions provided above. For example, an electrical connection sheet may have two electrical connection portions, one of which may be in the form of an electrical connection contact finger and the other in the form of an electrical connection contact, without limitation.

[0024] It is understandable that an electrical connection portion may also include one or more of the above-mentioned forms of electrical connection portions; for example, in an electrical connection portion on an electrical connection sheet, part of it may be an electrical connection contact ring, part of it may be an electrical connection contact point, etc., which is not limited here.

[0025] Furthermore, the main body and the pole of the battery unit are connected by an adhesive.

[0026] In the above solution, the electrical connector and battery cell are secured by connecting the main body of the connector to the battery cell terminal via adhesive. This connection method is structurally simple and, because the electrical connector and battery cover are completely isolated from each other, it avoids the risk of a short circuit between the connector and the battery cover.

[0027] Furthermore, a recessed portion is provided on the pole, and the electrical connection portion is electrically connected to the bottom wall of the recessed portion;

[0028] When the electrical connection piece and the battery post are connected by adhesive, the adhesive can easily overflow into the electrical connection area between the two. In the above solution, a recessed portion is provided to electrically connect the electrical connection portion of the electrical connection piece to the bottom wall of the recessed portion (referred to as the "first electrical connection surface"), and the main body of the electrical connection piece is connected to the non-recessed portion of the battery post (referred to as the "first structural connection surface") by adhesive. In this way, the electrical connection surface and the structural connection surface on the battery post can be separated, ensuring the strength of the structural connection while not affecting the electrical connection between the electrical connection piece and the battery post.

[0029] Or a protrusion is provided on the pole, and the electrical connection portion is electrically connected to the top surface of the protrusion.

[0030] In the above scheme, the top wall of the raised portion is used as the first electrical connection surface, and the non-raised portion area on the battery pole is used as the first structural connection surface; in this way, the first electrical connection surface and the first structural connection surface on the pole can be separated, while ensuring the structural connection strength without affecting the electrical connection between the electrical connection piece and the pole.

[0031] Furthermore, the surface where the electrical connection portion of the electrical connection piece contacts the battery pole to achieve electrical connection is called the second electrical connection surface, and the surface where the main body of the electrical connection piece is bonded to the battery pole is called the second structural connection surface; the height difference between the first electrical connection surface and the first structural connection surface is called the first height.

[0032] The height difference between the second electrical connection surface and the second structural connection surface is referred to as the second height, and the first height is set to be slightly higher than the second height. In this way, when the main body of the electrical connection sheet is bonded to the battery structure, a good electrical connection can be ensured between the electrical connection portion and the terminal.

[0033] Furthermore, the main body and the top cover of the battery unit are connected by an adhesive.

[0034] In the above solution, the electrical connector is secured to the battery cell by attaching the main body of the connector to the top cover of the battery cell using an adhesive. Compared to the terminal, the top cover structure has a larger surface area, which increases the contact area with the main body of the connector and improves the connection strength.

[0035] Furthermore, the top cover is provided with a top cover patch, the top cover patch is provided with a first avoidance hole, the first avoidance hole is filled with a filling adhesive, and the main body is bonded to the top cover through the adhesive.

[0036] The top cover patch is typically made of plastic, which can easily fall off at high temperatures. Therefore, gluing the metal body of the electrical connector to the plastic top cover patch is extremely unstable. Furthermore, gluing two metal materials (the body and the top cover) together provides a more reliable connection than gluing one metal material (the body) to one plastic material (the top cover patch).

[0037] Therefore, when the top cover structure is completely covered by the top cover patch, a first avoidance hole can be provided on the top cover patch to expose the top cover and achieve bonding with the main body.

[0038] As for the size of the first avoidance hole, the size of the first avoidance hole can be set to be larger than the main body (that is, the main body is completely projected into the first avoidance hole), so that the contact area between the main body and the top cover can be larger and the connection can be more reliable.

[0039] It is also possible to set the size of the first avoidance hole to be smaller than the main body (that is, the main body is partially projected into the first avoidance hole and partially overlapped on the top cover). Because the top cover patch has a certain thickness, a certain gap can be formed between the electrical connection piece and the top cover. The gap can be filled with an adhesive (insulating) to form an insulating glue groove, thereby avoiding the risk of short circuit between the electrical connection piece and the battery. The detailed structure of this setting is introduced later.

[0040] As for the shape of the first avoidance hole, it can be a square hole or a hole of any other shape, which is not limited here.

[0041] Furthermore, the main body portion is partially overlapped on the top cover patch.

[0042] When the main body of the electrical connecting piece is not flat enough, or when the main body is bonded to the top cover, the tooling is too large, or there is a conductive medium between the electrical connecting piece and the top cover, etc., the electrical connecting piece will cause direct contact with the battery top cover, thereby causing a short circuit between the positive and negative poles of the battery.

[0043] The top cover patch is made of insulating material and has a certain thickness. The main body can be overlapped on the top cover patch first. In this way, the top cover patch can separate the main body and the top cover by a certain height, and then the first avoidance hole between the two can be filled with adhesive to achieve the bonding between the main body and the top cover.

[0044] Specifically, the first escape hole can be configured as a circular hole surrounding the battery post (also referred to as a second escape hole), with the size of the second escape hole being larger than the outer diameter of the electrical connection portion. Preferably, the size of the second escape hole is 1 to 10 mm larger than the outer diameter of the electrical connection portion. In this way, when the main body of the electrical connection piece is bonded to the top cover, the main body first contacts the upper surface of the top cover patch (i.e., the main body overlaps the top cover patch), and then an adhesive (such as structural adhesive) is filled into the second escape hole to form an insulating adhesive groove, thereby bonding the main body to the top cover.

[0045] In addition, the thickness of the top cover patch can be set according to the thickness of the required structural adhesive.

[0046] Furthermore, a top cover patch is provided on the top cover, and a first reinforcement hole is provided on the top cover patch, and the first reinforcement hole is used to be filled with an adhesive.

[0047] In the above solution, when the top cover patch completely covers the top cover, in order to achieve adhesion between the top cover and the main body, a plurality of first reinforcement holes may be provided in the top cover patch.

[0048] When the main body and the top cover are bonded together, the adhesive enters the first reinforcement hole, forming a bonded structure between the main body and the top cover. Once the adhesive solidifies, it forms adhesive columns within the first reinforcement hole, creating a rubber ring between the top cover and the main body. The rubber ring and the adhesive columns are integrated into a single structure, thereby forming a reinforced structure.

[0049] Therefore, the provision of the first reinforcement hole can avoid the problem of unreliable adhesion and easy falling off between the top cover patch and the main body.

[0050] Furthermore, an insulating layer is provided on the main body, and the insulating layer is connected to the battery unit via an adhesive.

[0051] In the above solution, in order to avoid direct contact between the electrical connection piece and the battery top cover, an insulating layer is provided on the main body. During bonding, the insulating layer of the main body is connected to the battery unit through an adhesive.

[0052] The insulating layer may be formed on the main body by injection molding, spray molding or other molding methods, which are not limited here.

[0053] Furthermore, a second reinforcement hole is provided on the main body, and the second reinforcement hole is used to be filled with an adhesive.

[0054] To strengthen the structural connection between the main body and the battery, a second reinforcement hole may be provided on the main body. The second reinforcement hole is used to fill with adhesive. The principle of providing the first reinforcement hole is similar to that of providing the first reinforcement hole and will not be repeated here.

[0055] And / or a reinforcement plate is provided between the main body and the top cover, and a third reinforcement hole is provided on the reinforcement plate, and the third reinforcement hole is used for filling an adhesive.

[0056] In the above solution, in order to strengthen the structural connection strength between the main body and the battery cell, a reinforcing plate may be provided between the main body and the top cover, and a third reinforcing hole may be provided on the reinforcing plate for filling with adhesive.

[0057] The provision of the reinforcement plate prevents direct contact between the main body of the electrical connection piece and the top cover in extreme cases, resulting in a battery short circuit; at the same time, the provision of the reinforcement plate also improves the connection strength of the electrical connection structure.

[0058] The reinforcing plate itself is an injection molded part or a punched part, and has good insulation properties, for example, it can be made of epoxy resin material.

[0059] The principle of setting the third reinforcement hole is the same as the principle of setting the first reinforcement hole, and will not be repeated here.

[0060] It is understandable that, in practical applications, one of the above solutions for strengthening the structural connection strength between the main body and the battery unit may be selected, or a combination of multiple solutions may be used.

[0061] Furthermore, the main body is provided with a first disassembly portion, and / or the pole is provided with a second disassembly portion.

[0062] In the above solution, the purpose of setting the first disassembly part and / or the second disassembly part is to facilitate the separation of the electrical connection piece from the battery cell when the battery cell is disassembled after the battery cell is retired, and to facilitate the cascade utilization of the battery cell.

[0063] Furthermore, the first disassembly portion is a groove provided on the main body, and the second disassembly portion is a notch provided on the edge of the pole.

[0064] The disassembly portion can be provided on the electrical connection piece or on the battery.

[0065] Specifically, grooves can be provided at the four corners of the electrical connector (e.g., formed using a sheet metal stamping process). During disassembly, a disassembly tool is inserted into the grooves to separate the electrical connector from the battery. Alternatively, the edges of the battery post can be chamfered so that, after the electrical connector is connected, a gap is formed between the two. During disassembly, a disassembly tool is inserted into the gap to disassemble.

[0066] There is no restriction on the shape of the disassembly part, as long as a gap is formed at the connection between the main body and the battery. The number and position of the disassembly parts can be set accordingly according to actual needs and are not limited here.

[0067] In a second aspect of the present application, a battery module is provided, which uses the aforementioned battery connection structure to achieve electrical connection between multiple batteries.

[0068] In the above solution, the battery module may be a plurality of single batteries electrically connected through the aforementioned battery connection structure, or a plurality of sub-battery modules electrically connected through the aforementioned battery connection structure.

[0069] In a third aspect of the present application, a battery pack is provided, which includes the aforementioned battery module.

[0070] Compared with the prior art, the beneficial technical effects of this application are:

[0071] 1) The battery connection structure described in this application has reliable connection and simple operation process. It does not require traditional laser welding or fasteners to achieve electrical connection between the electrical connecting plate and the battery. It does not require welding tool positioning, welding machines, or numerous fasteners. The production equipment cost is low and the production efficiency is high. In the later maintenance, replacement or cascade utilization of the battery, no destructive disassembly is required. During the disassembly and replacement of the battery unit, the integrity of all components can be guaranteed, thereby improving the feasibility of the cascade utilization of the battery unit.

[0072] 2) The battery connection structure described in this application provides various forms of electrical connectors, including electrical contact fingers, electrical contact points, electrical contact rings, and electrical connection springs. Therefore, as needed, one or more of these various forms of electrical connectors can be used to achieve electrical connection with the battery cells, ensuring the reliability of the electrical connection between the two.

[0073] 3) This application provides multiple solutions for achieving a structural connection between the electrical connector and the battery cell, including bonding the main body of the electrical connector to the terminal with an adhesive, and bonding the electrical connector to the top cover with an adhesive. Therefore, any of the above structural connection methods can be used to achieve a structural connection between the electrical connector and the battery cell according to actual needs.

[0074] 4) The present application provides a variety of solutions for enhancing the structural connection strength, including providing a first reinforcement hole, and / or a second reinforcement hole, and / or a reinforcement plate, etc., to enhance the structural connection strength between the electrical connection piece and the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0075] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention 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.

[0076] Figure 1 is an overall schematic diagram of an electrical connection sheet including electrical connection contact fingers in one embodiment of the present invention;

[0077] Figure 2 yes Figure 1 Schematic diagram of the battery structure shown;

[0078] Figure 3 yes Figure 1 Schematic diagram of the electrical connection piece structure shown;

[0079] Figure 4 yes Figure 3 A schematic diagram of the back structure of the electrical connecting piece shown;

[0080] Figure 5 yes Figure 3 A side view of the electrical connection piece shown;

[0081] Figure 6 yes Figure 3 The electrical connecting piece shown is a schematic structural diagram of a split electrical connecting piece;

[0082] Figure 7 yes Figure 2 A schematic diagram of the structure of a battery unit shown;

[0083] Figure 8 yes Figure 1 A partial schematic diagram of the electrical connection between the electrical connecting piece and the battery unit;

[0084] Figure 9 is an overall schematic diagram of an electrical connection sheet including electrical connection contacts in one embodiment of the present invention;

[0085] Figure 10 yes Figure 9 A schematic structural diagram of the battery unit shown;

[0086] Figure 11 yes Figure 9 A schematic structural diagram of the electrical connection piece shown in ;

[0087] Figure 12 yes Figure 9 A partial schematic diagram of the electrical connection between the electrical connecting piece and the battery;

[0088] Figure 13 is a schematic diagram of another battery unit structure in one embodiment of the present invention;

[0089] Figure 14 yes Figure 13 A partial view of

[0090] Figure 15 Is the electrical connection piece and Figure 13 A partial view of the electrical connections of the battery cell shown;

[0091] Figure 16 is an overall schematic diagram of an electrical connection sheet including an electrical connection contact ring in one embodiment of the present invention;

[0092] Figure 17 yes Figure 16 A schematic structural diagram of the electrical connecting piece shown;

[0093] Figure 18 This is a schematic diagram of a first reinforcement hole in one embodiment of the present invention;

[0094] Figure 19 is a schematic diagram of an insulating layer in one embodiment of the present invention;

[0095] Figure 20 This is a schematic diagram of a second reinforcement hole in one embodiment of the present invention;

[0096] Figure 21 It is adopted Figure 20 The overall schematic diagram of the electrical connection sheet realizing electrical connection is shown;

[0097] Figure 22 is a schematic diagram of a structural adhesive after curing in one embodiment of the present invention;

[0098] Figure 23 is a schematic diagram of a reinforcement plate in one embodiment of the present invention;

[0099] Figure 24 is an overall schematic diagram of an electrical connection sheet including an electrical connection spring in one embodiment of the present invention;

[0100] Figure 25 yes Figure 24 A schematic structural diagram of the electrical connecting piece shown;

[0101] Figure 26 yes Figure 24 A partial schematic diagram of the electrical connection between the electrical connecting piece and the battery unit;

[0102] Figure 27 2 is a schematic diagram of a disassembly operation performed through the second disassembly unit in one embodiment of the present invention.

[0103] In the figure: 1-electrical connecting piece, 11-main body, 111-second reinforcement hole, 12-electrical connecting part, 121-electrical connection contact finger, 122-electrical connection contact, 123-electrical connection contact ring, 124-electrical connection contact spring, 13-insulating layer, 14-reinforcement plate, 141-third reinforcement hole, 15-first disassembly part, 2-battery unit, 21-pole, 211-second disassembly part, 22-top cover, 23-top cover patch, 231-first reinforcement hole, 232-first avoidance hole, 233-second avoidance hole, 3-adhesive, H1-first height, H2-second height, a-first electrical connection surface, b-first structural connection surface, A-second electrical connection surface, B-second structural connection surface. DETAILED DESCRIPTION

[0104] The following description provides many different embodiments or examples for implementing different features of the present invention. The components and arrangements described in the following specific examples are only used to simplify the present invention and are only used as examples, not to limit the present invention.

[0105] In the prior art, the way to achieve electrical connection between battery cells is to laser weld or fasten the electrical connection piece to the battery module. The problems are:

[0106] 1) Although fastener connections offer high flexibility, they require many fasteners, resulting in a complex process and a heavier battery module after assembly.

[0107] 2) Regarding laser welding, first, laser welding has very high requirements on the smoothness of the pole surface, and the pole needs to be finely processed, which has a high processing cost; second, since the negative pole needs to be welded with copper-aluminum composite welding, the composite welding of different materials is difficult, the welding cost is high, the welding reliability is poor, and the overcurrent capacity after welding is poor; third, after laser welding, the batteries cannot be disassembled for secondary maintenance and cascade utilization, which is not conducive to energy recovery and after-sales maintenance.

[0108] In order to solve at least one of the above problems, Figure 1-8 As shown, one embodiment of the present invention provides a battery connection structure;

[0109] The connection structure includes: an electrical connection piece 1 and a battery cell 2, wherein the electrical connection piece 1 includes a main body 11 and an electrical connection part 12; the main body 11 and the battery cell 2 are connected by an adhesive 3; and the electrical connection part 12 is electrically connected to the pole 21 of the battery cell 2.

[0110] When forming a battery module, multiple battery cells 2 need to be connected in series or parallel. The usual practice is to use the electrical connecting piece 1 as a medium to electrically connect the electrical connecting piece 1 to the poles 21 of the battery cells 2 to be connected in series or parallel.

[0111] In the above solution, a structure is provided for electrically connecting the electrical connection piece 1 to the poles 21 of the battery cells 2 to be connected in series or parallel. Specifically:

[0112] Specifically, if Figure 3-6 As shown, the electrical connection piece 1 includes a main body 11 and an electrical connection part 12; the main body 11 and the electrical connection part 12 can be set as one piece, so that the electrical connection piece 1 is directly processed using an integrated molding process; the main body 11 and the electrical connection part 12 can also be set as separate bodies, such as processing the main body 11 and the electrical connection part 12 separately, and the two can be detachably connected.

[0113] Of course, a plurality of electrical connection portions 12 may be provided on one electrical connection sheet 1 , so that electrical connection between a plurality of battery cells 2 can be achieved through one electrical connection sheet 1 .

[0114] An electrical connection is made between the electrical connection portion 12 of the electrical connection sheet 1 and the pole 21 of the battery cell 2; the electrical connection here can be achieved by directly contacting the electrical connection portion 12 with the pole 21 of the battery cell 2 to achieve electrical connection between the two; or by bonding the electrical connection portion 12 with the pole 21 of the battery cell 2 through a conductive adhesive to achieve electrical connection between the two; or there can be other conductive media between the electrical connection portion 12 and the pole 21 of the battery cell 2 to achieve electrical connection between the two.

[0115] The main body 11 and the battery cell 2 are connected by an adhesive 3. This adhesive 3 is used to achieve a structural connection between the electrical connection sheet 1 and the battery cell 2, preventing relative movement between the electrical connection sheet 1 and the battery cell 2, which could affect the electrical connection between the two. The adhesive 3 can be a structural adhesive, double-sided tape, or other adhesive-like material, as long as it can achieve structural relative fixation between the two objects.

[0116] It should be noted that the core of the above-mentioned method for achieving the structural connection between the main body 11 and the battery cell 2 is that the main body 11 and the battery cell 2 are bonded together using the adhesive 3. As for the specific bonding location, the main body 11 can be bonded to the terminal 21 of the battery cell 2 to achieve the structural connection between the two, or the main body 11 can be bonded to the non-terminal portion of the battery cell 2 (such as the top cover 22, the main body of the battery cell 2, etc.) to achieve the structural connection between the two.

[0117] It is understood that whether the structural connection between the main body 11 and the battery cell 2 terminal 21 is achieved by bonding the main body 11 to the battery cell 2 top cover 22 (or the main body of the battery cell 2), the adhesive 3 must be made of an insulating material. After the adhesive 3 cures, it forms a certain thickness in the structural connection area between the main body 11 and the battery cell 2 to prevent short circuits.

[0118] The above-mentioned battery connection structure has reliable connection and simple operation process, and does not require traditional laser welding or fasteners to achieve electrical connection between the electrical connecting plate 1 and the battery cell 2. It does not require welding tool positioning, does not require a welding machine, and does not require numerous fasteners. The production equipment cost is low and the production efficiency is high. In the later maintenance, replacement or cascade utilization of the battery, no destructive disassembly is required. During the disassembly and replacement of the battery cell 2, the integrity of all components can be guaranteed, thereby improving the feasibility of the cascade utilization of the battery cell 2.

[0119] In one embodiment, Figure 1-8 As shown, the electrical connection portion 12 includes an electrical connection contact finger 121, and the electrical connection contact finger 121 is electrically connected to the pole 21;

[0120] The above solution provides a specific form of the electrical connection portion 12. The electrical connection portion 12 is an electrical connection contact finger 121. The electrical connection contact finger 121 is connected to the main body 11 via a contact connection portion. Contact gaps can be provided between the multiple contact fingers. The electrical connection contact finger 121 is abutted against the terminal 21 of the battery cell 2, thereby achieving electrical connection between the two.

[0121] In one embodiment, Figure 9-15 As shown, the electrical connection portion 12 includes an electrical connection contact 122 , and the electrical connection contact 122 is electrically connected to the pole 21 ;

[0122] The above solution provides another specific form of the electrical connection portion 12. Electrical connection contact fingers 121 are provided on the electrical connection portion 12, and electrical connection between the electrical connection contact fingers 121 and the battery cell 2 pole 21 is achieved through point contact between the electrical connection contact fingers 121 and the battery cell 2 pole 21. The number of electrical connection contact fingers 121 can be set according to actual current flow requirements and can be one or more, without limitation.

[0123] In one embodiment, Figure 16-21 The electrical connection portion 12 includes an electrical connection contact ring 123 , and the electrical connection contact ring 123 is electrically connected to the pole 21 ;

[0124] The above solution provides another specific form of the electrical connection portion 12. An electrical connection contact ring 123 is provided on the electrical connection portion 12, and the electrical connection contact ring 123 forms a line contact with the terminal 21 of the battery cell 2. Specifically, the electrical connection contact ring 123 can be a fully enclosed ring or a semi-enclosed ring; the contact ring can be circular, square, or any other polygonal shape, as long as it forms a line contact with the terminal 21. This is not a limitation.

[0125] In one embodiment, Figures 24-26 The electrical connection portion 12 includes an electrical connection contact spring 124 , and the electrical connection contact spring 124 is electrically connected to the pole 21 .

[0126] The above solution provides another specific form of the electrical connection portion 12. The electrical connection portion 12 is provided with an electrical connection spring 124. The electrical connection spring 124 is stamped from sheet metal and includes a spring leaf and a welding portion. The spring leaf makes line or surface contact with the battery cell 2 terminal 21. The welding portion can be welded to the main body 11 using methods such as laser welding, electromagnetic pulse welding, ultrasonic welding, or resistance welding.

[0127] It is understood that an electrical connection sheet 1 may include one or more of the several types of electrical connection portions 12 provided above. For example, an electrical connection sheet 1 may have two electrical connection portions 12, one of which may be in the form of an electrical connection contact finger 121 and the other may be in the form of an electrical connection contact finger 121, without limitation.

[0128] It is understandable that an electrical connection portion 12 may also include one or more of the above-mentioned forms of electrical connection portions 12; for example, in an electrical connection portion 12 on the electrical connection sheet 1, part of it may be an electrical connection contact ring 123, part of it may be an electrical connection contact finger 121, etc., and there is no limitation here.

[0129] In one embodiment, Figure 1-8As shown, the main body 11 and the terminal 21 of the battery unit 2 are connected by an adhesive 3 .

[0130] In the above solution, the electrical connection piece 1 and the battery cell 2 are secured by connecting the main body 11 of the electrical connection piece 1 to the terminal 21 of the battery cell 2 via an adhesive 3. This connection method is structurally simple, and because the electrical connection piece and the top cover 22 of the battery cell 2 are completely non-contacting, the risk of a short circuit between the electrical connection piece 1 and the top cover 22 of the battery cell 2 is avoided.

[0131] Furthermore, if Figure 8 As shown, a recessed portion is provided on the pole 21, and the electrical connection portion 12 is electrically connected to the bottom wall of the recessed portion;

[0132] When the electrical connection piece 1 and the pole 21 are connected via the adhesive 3, the adhesive 3 is likely to overflow into the electrical connection area between the two. In the above scheme, a recessed portion is provided to electrically connect the electrical connection portion 12 of the electrical connection piece 1 to the bottom wall of the recessed portion (referred to as the "first electrical connection surface a"), and the main body 11 of the electrical connection piece 1 is connected to the non-recessed portion of the pole 21 of the battery cell 2 (referred to as the "first structural connection surface b") via the adhesive 3. In this way, the first electrical connection surface a and the first structural connection surface b on the pole 21 can be separated, ensuring the strength of the structural connection while not affecting the electrical connection between the electrical connection piece 1 and the pole 21.

[0133] In one embodiment, a protrusion (not shown) is provided on the pole 21 , and the electrical connection portion 12 is electrically connected to the top surface of the protrusion.

[0134] In the above scheme, the top wall of the raised portion is used as the first electrical connection surface, and the non-raised portion area on the pole 21 of the battery cell 2 is used as the first structural connection surface; in this way, the first electrical connection surface a and the first structural connection surface b on the pole 21 can be separated, while ensuring the structural connection strength without affecting the electrical connection between the electrical connection piece 1 and the pole 21.

[0135] Furthermore, the surface where the electrical connection portion 12 of the electrical connection sheet 1 contacts and electrically connects with the pole 21 of the battery cell 2 is referred to as the second electrical connection surface A, and the surface where the main body 11 of the electrical connection sheet 1 is bonded to the pole 21 is referred to as the second structural connection surface B.

[0136] like Figure 5 、 Figure 7 As shown, the height difference between the first electrical connection surface A and the first structural connection surface B is called the first height H1; the height difference between the second electrical connection surface A and the second structural connection surface B is called the second height H2, and the first height H1 is set to be slightly higher than the second height H2.

[0137] In this way, when the main body 11 of the electrical connection sheet 1 is structurally bonded to the battery unit 2 , a good electrical connection can be ensured between the electrical connection portion 12 and the pole 21 .

[0138] In one embodiment, Figure 9-26 As shown, the main body 11 and the top cover 22 of the battery unit 2 are connected by an adhesive 3 .

[0139] In the above solution, the electrical connection piece 1 and the battery cell 2 are secured by connecting the main body 11 of the electrical connection piece 1 to the top cover 22 of the battery cell 2 via an adhesive 3. Compared to the terminal 21, the top cover 22 has a larger surface area, which increases the contact area with the main body 11 of the electrical connection piece 1 and improves the connection strength.

[0140] Furthermore, in one embodiment, Figure 10-12 As shown, a top cover patch 23 is provided on the top cover 22 , a first avoidance hole 232 is provided on the top cover patch 23 , the first avoidance hole 232 is filled with an adhesive 3 , and the main body 11 is bonded to the top cover 22 through the adhesive 3 .

[0141] The top cover patch 23 is typically made of plastic and is prone to falling off at high temperatures. Therefore, bonding the main body 11 (metal) of the electrical connector 1 to the top cover patch 23 (plastic) creates a highly unstable connection. Bonding two metal materials (main body 11 and top cover 22) provides a more reliable connection than bonding one metal material (main body 11) to one plastic material (top cover patch 23).

[0142] Therefore, when the top cover 22 is structurally completely covered by the top cover patch 23 , a first avoidance hole 232 may be provided on the top cover patch 23 , thereby exposing the top cover 22 and achieving adhesion with the main body 11 .

[0143] As for the size of the first avoidance hole 232, the size of the first avoidance hole 232 can be set to be larger than the main body 11 (that is, the main body 11 is completely projected into the first avoidance hole 232), so that the contact area between the main body 11 and the top cover 22 can be larger and the connection can be more reliable.

[0144] It is also possible to set the size of the first avoidance hole 232 to be smaller than the main body 11 (that is, part of the main body 11 is projected into the first avoidance hole 232, and part is overlapped on the top cover 22). Because the top cover patch 23 has a certain thickness, a certain gap can be formed between the electrical connection piece 1 and the top cover 22. The gap can be filled with an adhesive 3 (insulating) to form an insulating glue groove, thereby avoiding the risk of short circuit between the electrical connection piece 1 and the battery cell 2. The detailed structure of this setting is introduced later.

[0145] As for the shape of the first avoidance hole 232, it can be a square hole or a hole of any other shape, which is not limited here.

[0146] Furthermore, in one embodiment, Figure 13-15 As shown, the main body 11 is partially overlapped on the top cover patch 23.

[0147] When the main body 11 of the electrical connection piece 1 is not flat enough, or when the main body 11 is bonded to the top cover 22, the tooling is too large, or there is a conductive medium between the electrical connection piece 1 and the top cover 22, etc., the electrical connection piece 1 will cause direct contact with the top cover 22 of the battery unit 2, thereby causing a short circuit between the positive and negative poles of the battery unit 2.

[0148] The top cover patch 23 is made of insulating material and has a certain thickness. The main body 11 can be overlapped on the top cover patch 23 first. In this way, the top cover patch 23 can separate the main body 11 from the top cover 22 by a certain height. Then, the adhesive 3 is filled into the first avoidance hole 232 between the two to achieve bonding between the main body 11 and the top cover 22.

[0149] Specifically, if Figure 13-14 As shown, the first avoidance hole 232 can be set as a circular hole surrounding the battery cell 2 pole 21 (for the sake of distinction and ease of understanding, the first avoidance hole 232 in the shape of a circular hole is referred to as the second avoidance hole 233), so that the size of the second avoidance hole 233 is larger than the outer diameter of the electrical connection part 12; preferably, the size of the second avoidance hole 233 is 1 to 10 mm larger than the outer diameter of the electrical connection part 12. Figure 15 As shown, when the main body 11 of the electrical connection piece 1 is bonded to the top cover 22, the main body 11 first contacts the upper surface of the top cover patch 23 (that is, the main body 11 overlaps the top cover patch 23), and then the adhesive 3 (such as structural adhesive) is filled in the second avoidance hole 233 to form an insulating adhesive groove to bond the main body 11 to the top cover 22.

[0150] In addition, the thickness of the top cover patch 23 can be set according to the thickness of the required structural adhesive.

[0151] In one embodiment, Figure 18 As shown, a top cover patch 23 is provided on the top cover 22 , and a first reinforcement hole 231 is provided on the top cover patch 23 . The first reinforcement hole 231 is used to fill the adhesive 3 .

[0152] In the above solution, when the top cover patch 23 completely covers the top cover 22 , in order to achieve adhesion between the top cover 22 and the main body 11 , a plurality of first reinforcement holes 231 may be provided in the top cover patch 23 .

[0153] When the main body 11 and the top cover patch 23 are bonded together, the adhesive 3 enters the first reinforcement hole 231, forming a bonded structure between the main body 11 and the top cover 22. After the adhesive 3 solidifies, it forms adhesive columns within the first reinforcement hole 231, forming an adhesive ring between the top cover patch 23 and the main body 11. The adhesive ring and the adhesive columns are integrated into a reinforced structure.

[0154] like Figure 18 As shown, the first reinforcement holes 231 can be evenly arranged in a circular shape around the entire pole 21, or can be arranged in any other shape (such as multiple first reinforcement holes 231 are arranged in a rectangular array), which is not limited here.

[0155] Therefore, the provision of the first reinforcement hole 231 can avoid the problem of unreliable adhesion and easy falling off between the top cover patch 23 and the main body 11.

[0156] In one embodiment, Figure 19 As shown, an insulating layer 13 is provided on the main body 11 , and the insulating layer 13 is connected to the battery unit 2 via an adhesive 3 .

[0157] In the above solution, in order to avoid direct contact between the electrical connection piece 1 and the top cover 22 of the battery cell 2, an insulating layer 13 is provided on the main body 11. During bonding, the insulating layer 13 of the main body 11 is connected to the battery cell 2 via the adhesive 3.

[0158] The insulating layer 13 may be formed on the main body 11 by injection molding, spraying or other molding methods, which are not limited here.

[0159] In one embodiment, Figure 20-22 As shown, a second reinforcement hole 111 is provided on the main body 11 , and the second reinforcement hole 111 is used to fill the adhesive 3 .

[0160] To strengthen the structural connection between the main body 11 and the battery cell 2, a second reinforcement hole 111 may be provided on the main body 11. The second reinforcement hole 111 is used to fill the adhesive 3. The principle of providing the first reinforcement hole 231 is similar and will not be repeated here.

[0161] In one embodiment, Figure 23 As shown, a reinforcement plate 14 is provided between the main body 11 and the top cover 22 . A third reinforcement hole 141 is provided on the reinforcement plate 14 . The third reinforcement hole 141 is used to fill the adhesive 3 .

[0162] In the above scheme, in order to strengthen the structural connection strength between the main body 11 and the battery cell 2, a reinforcing plate 14 can also be provided between the main body 11 and the top cover 22, and a third reinforcing hole 141 is provided on the reinforcing plate 14, and the third reinforcing hole 141 is used to fill the adhesive 3.

[0163] The provision of the reinforcing plate 14 prevents the main body 11 of the electrical connection piece 1 from directly contacting the top cover 22 in extreme cases, causing a short circuit in the battery unit 2; at the same time, the provision of the reinforcing plate 14 also improves the connection strength of the electrical connection structure.

[0164] The reinforcing plate 14 itself is an injection-molded part or a punched part with good insulation properties, for example, it can be made of epoxy resin material.

[0165] The principle of providing the third reinforcement hole 141 is the same as the principle of providing the first reinforcement hole 231 , and will not be repeated here.

[0166] It is understandable that, in practical applications, one of the above solutions for strengthening the structural connection strength between the main body 11 and the battery unit 2 may be selected, or a combination of multiple solutions may be used.

[0167] In one embodiment, Figure 16 、 Figure 17 、 Figure 27 As shown, the main body 11 is provided with a first disassembly portion 15 , and / or the pole 21 is provided with a second disassembly portion 211 .

[0168] In the above scheme, the purpose of setting the first disassembly part 15 and / or the second disassembly part 211 is to facilitate the separation of the electrical connection piece 1 from the battery cell 2 when the battery cell 2 is disassembled after the battery cell 2 is retired, and to facilitate the cascade utilization of the battery cell 2.

[0169] like Figure 16 、 Figure 17 As shown, the first disassembly portion 15 is a groove provided on the main body 11;

[0170] like Figure 27As shown, the second disassembly portion 211 is a notch provided at the edge of the pole 21 .

[0171] The disassembly portion can be provided on either the electrical connection piece 1 or the battery unit 2 .

[0172] Specifically, grooves can be provided on the four corners of the electrical connection piece 1 (e.g., formed by a sheet metal stamping process). During disassembly, a disassembly tool is inserted into the grooves to disassemble the electrical connection piece 1 and the battery cell 2. The edges of the battery cell 2 posts 21 can also be chamfered so that after the electrical connection piece 1 is connected, a gap is formed between the two. During disassembly, a disassembly tool is inserted into the gap to disassemble.

[0173] There is no limitation on the shape of the disassembly portion, as long as a notch is formed at the connection between the main body 11 and the battery unit 2. The number and position of the disassembly portions can be set accordingly according to actual needs and are not limited here.

[0174] One embodiment of the present application provides a battery module that uses the aforementioned battery connection structure to achieve electrical connection between multiple batteries.

[0175] In the above solution, the battery module may be a plurality of battery cells 2 electrically connected through the aforementioned battery connection structure, or a plurality of sub-battery modules electrically connected through the aforementioned battery connection structure.

[0176] One embodiment of the present application provides a battery pack, which includes the aforementioned battery module.

[0177] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A battery connection structure, characterized in that: It comprises an electrical connection piece (1), a battery unit (2), The electrical connection piece (1) comprises a main body (11) and an electrical connection portion (12), wherein the electrical connection portion (12) is electrically connected to a pole (21) of the battery unit (2), the electrical connection portion (12) protrudes relative to the main body (11), a recess is provided on the pole (21), and the electrical connection portion (12) is electrically connected to a bottom wall of the recess; The main body (11) and the non-recessed portion on the pole (21) are connected via an adhesive (3), and the adhesive (3) is solidified in a structural connection area between the main body (11) and the non-recessed portion on the pole (21) to form a certain thickness.

2. The battery connection structure according to claim 1, wherein: The electrical connection portion (12) includes an electrical connection contact finger (121), and the electrical connection contact finger (121) is electrically connected to the pole (21); and / or the electrical connection portion (12) includes an electrical connection contact (122), and the electrical connection contact (122) is electrically connected to the pole (21); and / or the electrical connection portion (12) includes an electrical connection contact ring (123), and the electrical connection contact ring (123) is electrically connected to the pole (21); And / or the electrical connection portion (12) includes an electrical connection contact spring (124), and the electrical connection contact spring (124) is electrically connected to the pole (21).

3. The battery connection structure according to any one of claims 1 to 2, wherein: An insulating layer (13) is provided on the main body (11), and the insulating layer (13) is connected to the non-recessed portion on the pole (21) via an adhesive (3).

4. The battery connection structure according to any one of claims 1 to 2, wherein: The main body (11) is provided with a second reinforcement hole (111), and the second reinforcement hole (111) is used for filling an adhesive (3).

5. The battery connection structure according to any one of claims 1 to 2, wherein: The main body (11) is provided with a first disassembly portion (15), and / or the pole (21) is provided with a second disassembly portion (211).

6. The battery connection structure according to claim 5, wherein: The first disassembling portion (15) is a groove provided on the main body (11), and the second disassembling portion (211) is a notch provided on the edge of the pole (21).

7. A battery module, characterized in that: The invention comprises the battery connection structure according to any one of claims 1 to 6.

8. A battery pack, characterized in that: Comprising the battery module as claimed in claim 7.

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