A connection structure

Abstract

The application discloses a connecting structure for the crimping connection between a battery pole and a busbar. A first hole of the battery pole is aligned with a second hole of the busbar and jointly forms a containing cavity extending in a longitudinal direction. At least part of the inner wall of the containing cavity is continued along the longitudinal direction by the hole wall of the first hole and the hole wall of the opposite second hole. An adhesive is filled in the containing cavity and penetrates and bonds the hole walls of the first hole and the second hole along the longitudinal direction, so as to connect the battery pole and the busbar along the longitudinal direction.

Description

Technical Field

[0001] This invention belongs to the field of new energy technology, and in particular relates to a connection structure. Background Technology

[0002] When power batteries are used in assemblies, reliable electrical connection between the terminals and busbars is a fundamental requirement. Battery terminals and busbars are often made of relatively rigid sheet conductors. Under vibration, the busbars and terminals may vibrate in different directions and frequencies. The stress transmitted from the busbars to the terminals can easily cause reliability problems at the electrical connection points, such as loosening or tearing of the busbars. As the capacity of individual battery cells gradually increases, the required cross-sectional area (current flux) of the sheet conductors also increases. The sheet conductors become increasingly rigid, stress transmission intensifies, and the pressure on the reliability of the electrical connection points increases accordingly.

[0003] Existing technologies mainly employ three processes: thermal welding, pressure bonding, and adhesive bonding. Thermal welding utilizes metal fusion techniques with greater penetration depth (spot welding, laser welding) and electrical connections with shallower penetration depth / weaker bond strength (ultrasonic welding), combined with an integrated external structure using encapsulation between battery cells. However, thermal welding can only be performed point-by-point. As the number of individual battery cells in battery modules increases, the low production efficiency of point-by-point bonding has become a major pain point in the industry. Furthermore, thermal welding also has a thermal impact on the battery.

[0004] Press-fit connection technology uses metal pressing and bonding (cold connection), with bolts or rivets penetrating through the center to mechanically fasten the busbar and surrounding areas. The penetration points of bolts and rivets in press-fit connection technology result in a loss of electrical conductivity and also pose reliability risks such as bolt or rivet loosening and metal fatigue. Furthermore, press-fit connections also require point-by-point connection.

[0005] The adhesive bonding process involves filling the space between the busbar and the terminal post with conductive adhesive and then sealing it with surrounding structural adhesive. However, this method suffers from a weaker peel strength between the busbar and the terminal post compared to heat welding and press-fitting processes because the longitudinal peel strength of the adhesive does not significantly increase with the adhesive area. Furthermore, the adhesive filling between the busbar and the top terminal post primarily provides longitudinal peel strength, failing to provide sufficient lateral peel strength (the horizontal shear direction of the adhesive). This makes the busbar and terminal post prone to lateral loosening during strong vibrations or long-term use.

[0006] Therefore, the industry has been striving to ensure that the electrical connection points have sufficient current carrying capacity while maintaining the stability of both longitudinal and lateral connections under strong vibrations (to further ensure the stability of electrical flux), and also to implement the overall synchronous operation of the connection process to significantly improve production efficiency. Summary of the Invention

[0007] Therefore, the purpose of this invention is to overcome the shortcomings of the prior art and provide a connection structure, crimping assembly, crimping equipment, single-layer planar battery module, multi-layer stacked battery module and connection method that can simultaneously achieve stable longitudinal and lateral connection between the busbar and the battery terminal, ensure sufficient electrical connection current carrying capacity, and realize efficient overall connection production.

[0008] The objective of this invention is achieved through the following technical solution: a connection structure for press-fitting a battery terminal and a busbar, wherein the battery terminal is disposed on the top of a battery body and includes: a battery terminal having at least one longitudinally extending first hole; a busbar, longitudinally stacked on the top of the battery terminal and having at least one second hole opposite to the first hole; wherein each first hole and the opposite second hole together form a receiving cavity in the longitudinally extending direction, at least a portion of the inner wall of the receiving cavity is formed by the hole wall of the first hole and the hole wall of the opposite second hole aligned and continuing along the longitudinal direction, and the receiving cavity is filled with an adhesive that penetrates and bonds the longitudinally aligned and continuing hole walls of the first hole and the second hole, to facilitate connecting the battery terminal and the busbar along the longitudinal direction.

[0009] In this invention, the first hole of the battery terminal and the second hole of the busbar are positioned opposite each other and together form a longitudinally extending receiving cavity. A portion of the adhesive filling the receiving cavity is bonded to the wall of the second hole of the busbar, and another portion is bonded to the wall of the first hole of the battery terminal. On the one hand, the adhesive's longitudinal tensile force firmly pulls the first and second holes together longitudinally; on the other hand, the adhesive's transverse shear force secures the first and second holes laterally, thus achieving a stable connection between the busbar and the battery terminal in both longitudinal and transverse directions. Furthermore, since the adhesive within the holes is sufficient to meet the peel strength requirements, there is no need for additional bolts or rivets for press-fitting connections, avoiding loss of electrical conductivity. Finally, the processes of drilling holes in the battery terminal and busbar and filling the holes with adhesive can all be achieved synchronously using multiple stamping heads of a stamping machine and multiple dispensing heads of a dispensing machine, eliminating the need for point-by-point operation for each battery terminal and greatly improving the efficiency of the connection process.

[0010] Furthermore, the connection structure of the present invention also includes a core post inserted along the longitudinal direction into the adhesive and at least partially passing through the first hole and the second hole, the core post having longitudinal tensile strength.

[0011] Furthermore, in the connection structure of the present invention, the core post is made of a rigid material and is formed as a nail-like body with the tip pointing downwards.

[0012] Furthermore, in the connection structure of the present invention, the core post is made of a conductive material.

[0013] Furthermore, in the connection structure of the present invention, the busbar has a bent portion that extends longitudinally downward from the second hole into the first hole at the position corresponding to the first hole. The bent portion surrounds the core post and the inner wall of the first hole, and an adhesive is filled between the bent portion and the core post.

[0014] Furthermore, in the connection structure of the present invention, the first hole is a countersunk hole, and the bottom of the core post is close to or abuts against the bottom of the countersunk hole.

[0015] Furthermore, in the connection structure of the present invention, an adhesive is provided between the opposing surfaces of the battery terminals and the busbars stacked longitudinally.

[0016] Furthermore, in the connection structure of the present invention, the top opening of the second hole is sealed with structural adhesive.

[0017] Furthermore, in the connection structure of the present invention, a top annular surface extending obliquely upward is formed at the top opening of the second hole.

[0018] Furthermore, in the connection structure of the present invention, the structural adhesive is a UV adhesive or polyurea.

[0019] Furthermore, in the connection structure of the present invention, the busbar has a bent portion that extends longitudinally downward from the second hole into the first hole at the position corresponding to the second hole, the bent portion surrounding the first hole and laterally pressing the inner wall of the first hole.

[0020] Furthermore, in the connection structure of the present invention, a bottom annular surface is formed at the bottom of the sidewall of the first hole, which extends obliquely downward or laterally outward, and the bottom of the bent portion extends at least partially along the bottom annular surface and abuts against the bottom annular surface upward.

[0021] Furthermore, in the connection structure of the present invention, an adhesive is provided between the bottom of the bent portion and the bottom annular surface and / or between the bent portion and the upper surface of the base.

[0022] Furthermore, in the connection structure of the present invention, the bent portion is formed by bending the weak portion of the busbar corresponding to the second hole region longitudinally downward.

[0023] Furthermore, in the connection structure of the present invention, an adhesive is provided between the bent portion and the wall of the first hole.

[0024] The objective of this invention is achieved through the following technical solution: a battery cell, comprising a battery body and a battery terminal disposed on the top of the battery body, the battery terminal comprising a base and a terminal plate disposed on the top of the base, the terminal plate being provided with at least one longitudinally extending first hole, adapted to form a countersunk hole, such that when the first hole is filled with adhesive, a core is inserted into the adhesive along the longitudinal direction and the bottom of the core approaches or abuts the bottom of the countersunk hole.

[0025] The objective of this invention is achieved through the following technical solution: a crimping assembly for crimping a connection between a battery terminal and a busbar. The connection structure between the battery terminal and the busbar includes a battery terminal having at least one longitudinally extending first hole; and a busbar, longitudinally stacked on top of the battery terminal, having at least one second hole opposite to the first hole. The assembly is characterized by including a crimping plate and at least one core post vertically disposed on one side of the crimping plate, and being securely connected. The arrangement position of the at least one core post corresponds to the first hole and the second hole.

[0026] Furthermore, in the crimping assembly of the present invention, the crimping plate is made of a conductive material.

[0027] Furthermore, in the crimping assembly of the present invention, the crimping plate is made of an insulating material.

[0028] Furthermore, in the crimping assembly of the present invention, the crimping plate is made of a light-transmitting material.

[0029] Furthermore, in the crimping assembly of the present invention, the connection area between the crimping plate and the core post is pre-coated with structural adhesive.

[0030] The objective of this invention is achieved through the following technical solution: a crimping device, wherein the crimping plate is used to simultaneously press multiple core posts corresponding to the second holes into the second holes, and then the crimping plate is broken off and removed.

[0031] The objective of this invention is achieved through the following technical solution: a single-layer planar battery module comprising multiple planar arranged battery cells, each battery cell comprising a battery body and a battery terminal disposed on the top of the battery body, wherein a busbar is longitudinally stacked on the top of the battery terminal, at least one battery terminal is provided with at least one longitudinally extending first hole, and the busbar corresponding to the at least one battery terminal is provided with a second hole opposite to the first hole, wherein each first hole and the opposite second hole together form a receiving cavity in the longitudinally extending direction, at least a portion of the inner wall of the receiving cavity is formed by the hole wall of the first hole and the hole wall of the opposite second hole aligned and continuing along the longitudinal direction, and the receiving cavity is filled with an adhesive that penetrates and bonds the hole walls of the longitudinally aligned and continuing first hole and second hole, so as to be suitable for connecting the battery terminal and the busbar along the longitudinal direction.

[0032] The objective of this invention is achieved through the following technical solution: a multi-layer stacked battery module, comprising at least two planar battery modules, each planar battery module comprising a plurality of battery cells arranged in a planar manner, each battery cell comprising a battery body and a battery terminal disposed on the top of the battery body, a busbar being stacked longitudinally on the top of the battery terminal, the battery cells of the at least two planar battery modules being longitudinally opposite to each other, at least one battery terminal being provided with at least one longitudinally extending first hole, and the busbar corresponding to the at least one battery terminal being provided with a second hole opposite to the first hole, wherein each first hole and the opposite second hole together form a receiving cavity in the longitudinally extending direction, at least a portion of the inner wall of the receiving cavity being aligned and extended along the longitudinal direction by the hole wall of the first hole and the hole wall of the opposite second hole, the receiving cavity being filled with an adhesive that penetrates and bonds the longitudinally aligned and extended hole walls of the first hole and the second hole, to facilitate connecting the battery terminal and the busbar along the longitudinal direction.

[0033] The objective of this invention is achieved through the following technical solution: a connection method for connecting multiple battery terminals and a busbar in a battery module, comprising the following steps:

[0034] S1, at least one longitudinally extending first hole is opened at the top of each of the battery terminals;

[0035] S2, fill the first hole with adhesive;

[0036] S3, the busbar is longitudinally stacked and bonded to the battery terminal using conductive adhesive, wherein a weak portion is pre-formed in the area of ​​the busbar corresponding to the first hole;

[0037] S4, multiple core posts are simultaneously pressed longitudinally against the weak part, so as to break and bend the weak part into a bent part that extends downward into the first hole while the core post extends into the first hole, thereby squeezing the adhesive into the gap between the core post, the bent part and the inner wall of the first hole.

[0038] The present invention achieves the following technical effects:

[0039] By simply filling the busbar and battery terminal hole with adhesive, sufficient longitudinal and lateral peel strength can be provided simultaneously, avoiding the loss of electrical conduction area caused by the press-fit connection process. This ensures a stable connection and electrical conduction between the busbar and battery terminal, while also enabling the overall synchronous process of multiple battery cells in the battery module, greatly improving production efficiency. Attached Figure Description

[0040] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0041] Figure 1 This is a schematic diagram of a battery cell of the present invention;

[0042] Figure 2 This is a schematic diagram of the connection structure of the present invention;

[0043] Figure 3 This is a cross-sectional view of the connection structure of the present invention;

[0044] Figure 4 This is a schematic diagram of the busbar according to the first embodiment of the present invention;

[0045] Figure 5 This is a schematic diagram of the busbar according to the second embodiment of the present invention;

[0046] Figure 6 This is a schematic diagram of the current path in the connection structure of the present invention;

[0047] Figure 7 This is a schematic diagram of the crimping assembly of the present invention;

[0048] The reference numerals in the accompanying drawings of this invention are as follows:

[0049] 1-Battery terminal, 11-Terminal plate, 12-Base, 13-First hole, 14-Bottom annular surface, 2-Bus, 21-Second hole, 22-Weak part, 221-Partially thinned part, 222-Small hole, 223-Hollow, 23-Bending part, 24-Top annular surface, 3-Pressure plate, 41-First adhesive, 42-Second adhesive, 43-Third adhesive, 44-Fourth adhesive, 45-Fifth adhesive, 5-Core, 6-Structural adhesive. Detailed Implementation

[0050] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0051] The components of the embodiments of the invention described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0052] definition

[0053] In this invention, a "cell battery" can be a cylindrical cell battery, a square cell battery, or a cell battery of any other shape, as long as it has battery terminals that need to be connected to a busbar. In this invention, "longitudinal" refers to the direction extending along the height of the cell battery, and "lateral" refers to the direction perpendicular to the height of the cell battery. In this invention, "connection" includes not only physical connection but also electrical connection.

[0054] battery cell

[0055] The battery cell of the present invention includes a battery body and a battery terminal 1 disposed on the top of the battery body, such as Figure 1 As shown, to illustrate the connection structure applicable to this invention, the battery terminal 1 includes a base 12 and a terminal piece 11 disposed on the top of the base 12. The base 12 is preferably cylindrical, made of conductive material, and its bottom is fixedly connected to the battery body, achieving electrical connection within the battery body. The terminal piece 11 is fixedly connected to the top of the base 12. Alternatively, the terminal piece 11 can be integrally formed with the base 12, as long as the base 12 can provide support for the terminal piece 11 and achieve conductive communication between the terminal piece 11 and the interior of the battery body.

[0056] To accommodate the connection structure of this invention, a first hole 13 needs to be formed in the battery terminal 1. Therefore, the lateral and longitudinal dimensions of the battery terminal 1 must be at least a certain size larger than the first hole 13 to ensure the strength and current carrying capacity of the battery terminal 1 after the first hole 13 is formed. To meet this requirement, this invention provides the aforementioned battery terminal 1 structure, in which the terminal piece 11 is used to form the first hole 13, and the protruding portion 111 increases the lateral dimension of the terminal piece 11, ensuring that the first hole 13 does not impair the strength and overcurrent capacity of the terminal piece 11.

[0057] In one embodiment, such as Figure 2 and 3 As shown ( Figure 3 (For illustrative purposes only, especially the dimensional relationships between the longitudinal dimension of the bent portion, the longitudinal dimension of the first hole, and the transverse dimension of the second hole in the figure are for illustrative purposes only.) A longitudinally extending first hole 13 is provided on the electrode post 11. The longitudinal depth of the first hole 13 is equal to the thickness of the electrode post 11. The bottom of the first hole 13 connects with the top of the base 12 to form a countersunk hole, and the bottom of the countersunk hole is the top of the base 12. The first hole 13 has a sidewall, and the bottom of its sidewall forms a bottom annular surface 14 that extends obliquely downward. In another embodiment, the bottom of the sidewall of the first hole forms a bottom annular surface that extends laterally (not shown in the figure).

[0058] bus

[0059] The busbar 2 of this invention has a similar shape to that of the prior art and is mainly used to realize the electrical connection between multiple battery terminals 1 in a battery module. The area of ​​the busbar 2 corresponding to the battery terminal 1 is elongated and extends along the long side of the battery terminal. The busbar 2 is stacked longitudinally on the top of the terminal plate 11. The busbar 2 can be a plane extending laterally, so that the bottom plane of the busbar 2 and the top plane of the terminal plate 11 achieve full planar contact. In another embodiment, the busbar 2 can also not extend completely along the plane laterally, for example, it has a bent structure, but it must at least be planar at the corresponding position of the terminal plate 11, so as to ensure that the bottom of the busbar 2 and the top of the terminal plate 11 achieve at least partial planar contact.

[0060] In one embodiment, the busbar 2 is provided with a second hole 21, which is a through hole extending longitudinally through the busbar 2. When the busbar 2 and the battery terminal 1 are stacked and pressed together longitudinally, the first hole 13 and the second hole 21 are aligned laterally. In this state, the first hole 13 and the second hole 21 together form a longitudinally extending receiving cavity. Those skilled in the art will understand that the cross-sectional shape of the first hole 13 and the second hole 21 is not limited to a circle, but can also be square, hexagonal, etc. Furthermore, "alignment" does not require the centers of the two holes to coincide laterally, as long as the hole walls of the first hole 13 and the second hole 21 continue longitudinally. The purpose of this design is to ensure that a thinner, continuous piece of adhesive can simultaneously bond to the hole walls of the first hole 13 and the second hole 21, thereby tightening the busbar 2 and the battery terminal 1 longitudinally.

[0061] In a preferred embodiment, the first hole 13 and the second hole 21 are circular holes of equal diameter, with their centers overlapping laterally. The upper half of the periphery of the receiving cavity is formed by the wall of the second hole 21 and extends longitudinally downwards to align with and transition to the wall of the first hole 13. In another embodiment, the diameters of the first hole 13 and the second hole 21 may be unequal.

[0062] In one embodiment, such as Figure 4 As shown, the second hole 21 of the busbar 2 is pre-formed as a weak portion 22, which can be a locally thinned portion 221 of the busbar 2; in another embodiment, as Figure 5 As shown, the weak part 22 may have a pre-drilled hole 222 or a hollow 223. The hole 232 or the hollow 233 has stress concentration, and when an external tool presses downward, the weak part 22 is more likely to break.

[0063] In one embodiment, by pressing the weak portion 22 downward to form a bent portion 23, the busbar 2 forms a second hole 21, while the bent portion 23 folds downward and expands outward. The bent portion 23 extends downward into the first hole 13 and surrounds the hole wall of the first hole 13 from the inside out.

[0064] When the longitudinal extension length of the bent portion 23 caused by the compression of the weak portion 22 is greater than the longitudinal depth of the first hole 13, in order to avoid interference between the bottom of the bent portion 23 and the bottom of the first hole 13, a bottom annular surface 14 extending obliquely downward is formed at the bottom of the hole wall of the first hole 13. This guides the bottom of the bent portion 23 to extend along the bottom annular surface 14 and press upward, thereby providing longitudinal upward support for the battery terminal 1. At the same time, the top of the bent portion 23 pulls the busbar 2 downward to further clamp the two and improve the longitudinal peel strength.

[0065] Core

[0066] The connection structure of the present invention also includes a core post 5, which is made of a rigid or flexible material, as long as it has tensile strength along the extension direction of the core post 5. The core post 5 is inserted longitudinally into the adhesive in the receiving cavity and passes through the second hole 21 and the first hole 13, such that within the range of the first hole 13 and the second hole 21, the adhesive tightly wraps the core post 5 inward, while at the same time the adhesive adheres to the hole walls of the first hole 13 and the second hole 21 outward. Thus, the core post 5 provides "longitudinal tension" for the adhesive, further improving the longitudinal peel strength between the battery terminal 1 and the busbar 2.

[0067] In one embodiment, the core post 5 is made of a rigid material, which, during the longitudinal insertion into the receiving cavity, compresses the adhesive outward along the transverse periphery, causing the adhesive to be thinned by the core post 5 and the hole wall. This drives the adhesive to flow and fill the nearby voids, and the denser adhesive has higher longitudinal peel strength.

[0068] In another embodiment, the bottom of the core post 5 is formed into a pointed part to ensure that the core post 5 is inserted into the receiving cavity more smoothly.

[0069] In one embodiment, the bottom of the core post 5 is preferably close to the bottom of the countersunk hole of the first hole 13, thereby ensuring that most of the adhesive in the cavity is inserted longitudinally by the core post 5, improving the integrity of the adhesive in the cavity, and ensuring the longitudinal peel strength between the battery terminal 1 and the busbar 2.

[0070] Connection structure

[0071] The connection structure of the present invention, such as Figure 2 and 3 As shown, when the busbar 2 and the battery terminal 1 are longitudinally stacked and pressed together, the weak part 22 of the busbar 2 is aligned with the first hole 13 of the battery terminal 1. In one embodiment, a first adhesive 41 is provided between the longitudinally stacked and pressed contact surfaces of the busbar 2 and the battery terminal 1 to further improve their longitudinal peel strength. If the first adhesive 41 is a conductive adhesive, it also provides a current path. In one embodiment, the conductive adhesive is a room-temperature curing cold solder joint adhesive.

[0072] In one embodiment, the weak portion 22 is directly pressed down by the core post 5 to break it, thereby forming the bent portion 23, and the core post 5 is inserted into the receiving cavity. In another embodiment, the weak portion 22 can be broken down by an external tool to form the bent portion 23 before the core post 5 is inserted into the receiving cavity.

[0073] According to a first embodiment of the present invention, adhesive is first filled into the first hole 13, and then the busbar 2 is longitudinally stacked and pressed against the top of the battery terminal 1. The core post 5 is used to press down on the weak part 22, so that the weak part 22 is broken and folded downward to form a bent part 23 inserted into the first hole 13. During this process, the core post 5 continues to press down and laterally squeeze the bent part 23 outward, so that the bent part 23 is pressed tightly against the wall of the first hole 13. During this process, part of the adhesive previously filled into the first hole 13 is squeezed into the space between the bent part 23 and the inner wall of the first hole 13 to form a second adhesive 42, and even squeezed upward into the gap between the longitudinally stacked opposing surfaces of the busbar 2 and the battery terminal 1. Another part is squeezed into the space between the core post 5 and the bent part 23 to form a third adhesive 43, and continues to be squeezed upward into the second hole 21, so that the entire receiving space is filled with adhesive. When the bottom of the bent portion 23 is longer, the bottom of the bent portion 23 extends along the bottom annular surface 14 and presses against the bottom annular surface 14 upward. A fourth adhesive 44 is filled between the bottom of the bent portion 23 and the bottom annular surface 14, and a fifth adhesive 45 is provided between the upper surface of the base 12 and the bottom of the bent portion 23.

[0074] In one embodiment, the top of the bent portion 23 breaks off from the busbar 2. In another embodiment, although the top of the bent portion 23 remains connected to the busbar 2, the bent portion 23 expands outward in a circumferential direction, forming a circumferentially petal-like unfolding, with gaps between the petals. This allows the adhesive within the entire receiving cavity to be interconnected, meaning the second adhesive 42 and the third adhesive 43 are bonded together as a whole, with a portion bonded to the wall of the first hole 13 and another portion bonded to the wall of the second hole 21, thereby providing sufficient longitudinal peel strength.

[0075] In one embodiment, the top opening of the second hole 21 of the busbar 2 is sealed with structural adhesive 6 to ensure the strong adhesion of the core post 5 within the receiving cavity. Furthermore, since the adhesive is preferably a conductive adhesive, which has a long curing time, while the structural adhesive 6 has a short curing time, subsequent battery module manufacturing processes can continue after the structural adhesive has cured, without waiting for the conductive adhesive to cure, significantly accelerating the process cycle. The structural adhesive 6 is preferably a UV adhesive or polyurea.

[0076] In one embodiment, to further improve the connection strength between the structural adhesive 6 and the busbar 2, a top annular surface 24 extending obliquely upward is formed at the top opening of the second hole 21, so that the outer peripheral portion of the structural adhesive 6 directly covers and bonds to the top annular surface 24.

[0077] conductive connection

[0078] The core post 5 of the present invention is preferably made of conductive material. The bottom of the core post 5 is preferably in contact with the bottom of the countersunk hole of the first hole 13. The first adhesive 41, the second adhesive 42, the third adhesive 43, the fourth adhesive 44, and the fifth adhesive 45 are preferably conductive adhesives, thereby forming a current path between the battery terminal 1 and the busbar 2 of the present invention.

[0079] like Figure 6 As shown (arrows indicate current paths), in the first flow path r1, the current is directly conducted to the busbar 2 through the base 12, electrode 11, and first adhesive 41; this path has the strongest current flow. In the second flow path r2, the current is conducted laterally from the electrode 11 through the second adhesive 42 and the third adhesive 43 to the core 5, and then through the core 5 or directly through the third adhesive 43 to the busbar 2. In the third flow path r3, since the bottom of the core 5 abuts against the bottom of the first hole 13, the base 12 directly conducts current to the busbar 2 through the core 5.

[0080] crimping equipment

[0081] This invention also provides a crimping device, which mainly achieves the connection structure of this invention through a crimping assembly. For example... Figure 7 As shown, the crimping assembly includes a crimping plate 3 and multiple core posts 5 vertically arranged on one side of the crimping plate 3. The number and arrangement of the core posts 5 correspond one-to-one with the number and arrangement of the battery terminals 1 in the battery module, that is, one-to-one with the first hole 13 and the second hole 21. Pressing down the crimping plate 3 enables the multiple core posts 5 to simultaneously break the weak part 22 and insert into the first hole 13, completing the connection process in one go, greatly improving process efficiency.

[0082] In one embodiment, the pressing plate 3 is made of insulating material. When the core post 5 is pressed into the receiving cavity, even if the pressing plate 3 and the core post 5 are kept connected, the circuit connection of the battery module will not be affected.

[0083] In another embodiment, UV adhesive can be pre-applied to the connection area between the pressing plate 3 and the core post 5. When the core post 5 is inserted into the receiving cavity, the UV adhesive is simultaneously pressed by the pressing plate 3 into the opening area at the top of the second hole 21. In this case, it is preferable that the pressing plate 3 is made of a light-transmitting material, so that the UV adhesive can be cured quickly directly through the pressing plate 3, thereby improving process efficiency.

[0084] In another embodiment, the pressure plate 3 can also be made of a conductive material, allowing the pressure plate 3 to be separated from the multiple core posts 5 when they are inserted into the receiving cavity. In another embodiment, when multiple battery cells of the battery module are electrically connected in parallel, the conductive circuit is not affected even if the pressure plate 3 is retained.

[0085] Battery Module

[0086] This invention provides a single-layer planar battery module, comprising multiple planar arranged battery cells. Each battery cell includes a battery body and a battery terminal 1 disposed on the top of the battery body. A busbar 2 is longitudinally stacked on the top of the battery terminal 1. The battery terminal 1 is provided with a longitudinally extending first hole 13. The busbar 2 corresponding to the battery terminal 1 is provided with a second hole 21 opposite to the first hole 13. Each first hole 13 and the opposite second hole 21 together form a receiving cavity in the longitudinal extension. At least a portion of the inner wall of the receiving cavity is formed by the hole wall of the first hole 13 and the hole wall of the opposite second hole 21 aligned and continuing along the longitudinal direction. The receiving cavity is filled with an adhesive that penetrates and bonds the hole walls of the longitudinally aligned first hole 13 and the second hole 21, so as to facilitate connecting the battery terminal 1 and the busbar 2 along the longitudinal direction.

[0087] This invention provides a multi-layer stacked battery module, each layer of the planar battery module comprising a plurality of planarly arranged battery cells, each battery cell comprising a battery body and a battery terminal 1 disposed on the top of the battery body, a busbar 2 being longitudinally stacked on the top of the battery terminal 1, the battery cells of the at least two layers of planar battery modules being longitudinally opposite each other, the battery terminal 1 being provided with at least one longitudinally extending first hole, the busbar 2 corresponding to the battery terminal 1 being provided with a second hole 21 opposite to the first hole 13, wherein each first hole 13 and the opposite second hole 21 together form a receiving cavity in the longitudinally extending cavity, at least a portion of the inner wall of the receiving cavity being aligned and extended along the longitudinal direction by the hole wall of the first hole 13 and the hole wall of the opposite second hole 21, the receiving cavity being filled with an adhesive that penetrates and bonds the hole walls of the longitudinally aligned first hole 13 and the second hole 21, to facilitate connecting the battery terminal 1 and the busbar 2 along the longitudinal direction. In the case of multi-layer stacked battery modules, since the battery cells of the two layers of planar battery modules correspond one-to-one in the longitudinal direction, it is only necessary to press the top layer of battery module to realize the rapid connection between the battery terminal 1 and the busbar 2 of each layer of battery module.

[0088] Those skilled in the art will understand that the number of first holes 13 on each battery terminal 1 can be multiple. In this case, the number of second holes 21 on the busbar 2 can also be multiple, corresponding one-to-one with the first holes 13. Accordingly, multiple receiving cavities and multiple bends 23 can be formed.

[0089] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A connection structure for press-fitting a battery terminal to a busbar, wherein the battery terminal is disposed on the top of the battery body, characterized in that, include: The battery terminal has at least one longitudinally extending first hole; A busbar, stacked longitudinally on top of the battery terminal post, is provided with at least one second hole that is laterally aligned with the first hole; Each of the first holes and the aligned second holes together form a receiving cavity extending in the longitudinal direction. At least a portion of the inner wall of the receiving cavity is formed by the hole wall of the first hole and the hole wall of the aligned second hole extending in the longitudinal direction. The receiving cavity is filled with an adhesive that penetrates and bonds at least a portion of the hole wall of the first hole and at least a portion of the hole wall of the second hole extending in the longitudinal direction, so as to be suitable for connecting the battery terminal to the busbar in the longitudinal direction.

2. The connection structure as described in claim 1, characterized in that, It also includes a core post inserted along the longitudinal direction into the adhesive and at least partially passing through the first and second holes, the core post having longitudinal tensile strength.

3. The connection structure as described in claim 2, characterized in that, The core is made of a rigid material and is formed as a nail with the tip pointing downwards.

4. The connection structure as described in claim 2, characterized in that, The core is made of a conductive material.

5. The connection structure as described in claim 2, characterized in that, The busbar has a bent portion that extends longitudinally downward from the second hole into the first hole at the position corresponding to the first hole. The bent portion surrounds the core post and the inner wall of the first hole, and adhesive is filled between the bent portion and the core post.

6. The connection structure as described in claim 2, characterized in that, The first hole is a countersunk hole, and the bottom of the core post is close to or abuts the bottom of the countersunk hole.

7. The connection structure as described in claim 1, characterized in that, An adhesive is provided between the opposing surfaces of the battery terminals and the longitudinally stacked busbars.

8. The connection structure as described in claim 1, characterized in that, The top opening of the second hole is sealed with structural adhesive.

9. The connection structure as described in claim 8, characterized in that, The top opening of the second hole has a top annular surface that extends obliquely upwards and outwards.

10. The connection structure as described in claim 8, characterized in that, The structural adhesive is a UV adhesive or polyurea.

11. The connection structure as described in claim 1, characterized in that, The busbar has a bent portion that extends longitudinally downward from the second hole into the first hole at the position corresponding to the second hole. The bent portion surrounds the first hole and laterally presses against the inner wall of the first hole.

12. The connection structure as described in claim 11, characterized in that, The bottom of the first hole sidewall has a bottom annular surface that extends obliquely downward or laterally outward, and the bottom of the bent portion extends at least partially along the bottom annular surface and abuts against the bottom annular surface upward.

13. The connection structure as described in claim 12, characterized in that, An adhesive is provided between the bottom of the bent portion and the bottom annular surface and / or between the bent portion and the bottom of the first hole.

14. The connection structure as described in claim 11, characterized in that, The bent portion is formed by bending the weak portion of the busbar corresponding to the second hole region longitudinally downward.

15. The connection structure as described in claim 11, characterized in that, There is an adhesive between the bent portion and the sidewall of the first hole.

16. A battery cell, comprising a battery body and battery terminals disposed on the top of the battery body, characterized in that, The battery terminal includes a base and a terminal plate disposed on the top of the base. The terminal plate is provided with at least one longitudinally extending first hole, which is adapted to be formed as a countersunk hole, such that when the first hole is filled with adhesive, a core is inserted into the adhesive along the longitudinal direction and the bottom of the core approaches or abuts the bottom of the countersunk hole.

17. A connection assembly for crimping a battery terminal to a busbar, wherein the battery terminal is disposed on the top of the battery body, characterized in that, include: Battery terminals, each battery terminal is provided with multiple longitudinally extending first holes; The busbar is stacked vertically on top of the battery terminal post and has multiple second holes. The number of second holes is the same as the number of first holes, and the second holes are aligned with the first holes one by one. Each of the first holes and the aligned second holes together form a receiving cavity extending in the longitudinal direction. At least a portion of the inner wall of the receiving cavity is formed by the hole wall of the first hole and the hole wall of the aligned second hole extending in the longitudinal direction. The receiving cavity is filled with an adhesive that penetrates and bonds at least a portion of the hole wall of the first hole and at least a portion of the hole wall of the second hole extending in the longitudinal direction, so as to be suitable for connecting the battery terminal to the busbar in the longitudinal direction. Multiple core posts, the number of which is the same as the first hole and their arrangement corresponds to the first hole, so as to allow each core post to be inserted into the adhesive along the longitudinal direction and to at least partially pass through the first hole and the second hole, the core posts having longitudinal tensile strength; A pressing plate, wherein the core post is vertically disposed on one side of the pressing plate and is securely connected.

18. The connection component as claimed in claim 17, characterized in that, The pressure plate is made of a conductive material.

19. The connection component as claimed in claim 17, characterized in that, The pressing plate is made of insulating material.

20. The connection component as claimed in claim 19, characterized in that, The pressing plate is made of a light-transmitting material.

21. The connection component as claimed in claim 17, characterized in that, The connection area between the pressure plate and the core post is pre-applied with structural adhesive.

22. A single-layer planar battery module, comprising a plurality of planarly arranged battery cells, each battery cell comprising a battery body and a battery terminal disposed on top of the battery body, wherein a busbar is longitudinally stacked on top of the battery terminal, characterized in that, At least one battery terminal is provided with at least one longitudinally extending first hole, and a busbar corresponding to the at least one battery terminal is provided with a second hole aligned with the first hole. Each first hole and the aligned second hole together form a receiving cavity in the longitudinally extending direction. At least a portion of the inner wall of the receiving cavity is formed by the hole wall of the first hole and the hole wall of the aligned second hole aligned and continuing along the longitudinal direction. The receiving cavity is filled with an adhesive that penetrates and bonds the hole walls of the longitudinally aligned first hole and the hole walls of the second hole, so as to be suitable for connecting the battery terminal and the busbar along the longitudinal direction.

23. A multi-layer stacked battery module, comprising at least two layers of planar battery modules, each layer of the planar battery module comprising a plurality of planarly arranged battery cells, each battery cell comprising a battery body and a battery terminal disposed on top of the battery body, wherein a busbar is longitudinally stacked on top of the battery terminal, and the battery cells of the at least two layers of planar battery modules are longitudinally opposite each other, characterized in that, At least one battery terminal is provided with at least one longitudinally extending first hole, and a busbar corresponding to the at least one battery terminal is provided with a second hole aligned with the first hole. Each first hole and the aligned second hole together form a receiving cavity in the longitudinally extending direction. At least a portion of the inner wall of the receiving cavity is formed by the hole wall of the first hole and the opposite hole wall of the second hole aligned and continuing along the longitudinal direction. The receiving cavity is filled with an adhesive that penetrates and bonds the hole walls of the longitudinally aligned first hole and the hole walls of the second hole, so as to be suitable for connecting the battery terminal and the busbar along the longitudinal direction.

24. A method for connecting multiple battery terminals and a busbar in a battery module, characterized in that, Including the following steps: S1, at least one longitudinally extending first hole is opened at the top of each of the battery terminals; S2, fill the first hole with adhesive; S3, the busbar is longitudinally stacked and bonded to the battery terminal using an adhesive, wherein a weak portion is pre-formed in the area of ​​the busbar corresponding to the first hole; S4, multiple core posts are simultaneously pressed longitudinally against the weak part, so as to break and bend the weak part into a bent part that extends downward into the first hole while the core post extends into the first hole, thereby squeezing the adhesive into the gap between the core post, the bent part and the inner wall of the first hole.

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