Battery module

Abstract

The invention discloses a battery module, which belongs to the technical field of power batteries, and comprises at least two groups of battery units, the side surface of each battery unit is provided with a pole, and the battery units are arranged along the direction of the pole; a gap exists between every two adjacent battery units, and the pole columns of the two battery units are located in the gaps; each of the two poles in the gap is provided with an external connecting piece, the external connecting piece comprises a leading-out pole piece, the leading-out pole piece comprises a first leading-out piece, a transition piece and a second leading-out piece, the first leading-out piece extends into the gap to be connected with the poles, and the transition piece is connected with the first leading-out piece and extends to the top position of the battery unit; the second lead-out sheets are connected with the transition sheets and extend to the outer edges of the battery units, and the second lead-out sheets of two adjacent battery units are connected through a connecting sheet. According to the invention, the pole columns in the gap of two adjacent battery units can be connected outside the gap through the external connecting piece structure.

Description

Technical Field

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

[0002] When batteries are used as energy sources, multiple battery modules are usually integrated and installed in a battery pack. The battery pack protects the internal battery modules and facilitates the installation, replacement and maintenance of the battery modules. In the battery pack, the tabs of adjacent battery modules are connected to achieve series and parallel connection of all battery modules.

[0003] For example, in the prior art, a Chinese patent document with a publication number of CN218414953U discloses a square battery and a battery module, including a core pack, a negative electrode tab, a negative electrode adapter and a negative electrode column, wherein the negative electrode adapter is a copper-aluminum composite sheet composed of an aluminum sheet and a copper sheet. When the square batteries are connected in series or in parallel to form a battery module, the tabs of adjacent square batteries need to be connected. However, in a limited space, it is difficult to complete the connection process of the tabs, adapters and poles.

[0004] Another example is a Chinese patent document with publication number CN114024081A in the prior art, which discloses a power battery, which relates to the field of power battery technology. The power battery includes a battery assembly and a bus assembly. The battery assembly includes a plurality of battery cells arranged in an array, and the poles of the battery cells are arranged at both ends of the battery cells; the bus assembly includes a bus, a flexible circuit board, a plurality of heat-conducting parts and a plurality of temperature sensors, and the bus is electrically connected to the poles of two adjacent battery cells. Since the poles of the battery cells are arranged on both sides, the arrangement of the battery cells in the battery pack is usually relatively compact, and the poles are in the gap space between the two battery cells, which makes the pole connection process more difficult to operate, affecting the efficiency of the assembly work. Summary of the invention

[0005] The object of the present invention is to provide a battery module to solve the problem in the prior art that the arrangement of battery cells in a battery pack is usually relatively compact, and the pole is in the gap space between two battery cells, which makes the pole connection process difficult to operate.

[0006] In order to achieve the above-mentioned purpose, the present invention provides a battery module, comprising at least two groups of battery cells, wherein poles are provided on the sides of the battery cells, and the battery cells are arranged along the direction of the poles; there is a gap between two adjacent battery cells, and the poles of the two battery cells are in the gap; the two poles in the gap are each provided with an external connecting piece, and the external connecting piece includes a lead-out pole piece, and the lead-out pole piece includes a first lead-out pole piece, a transition pole piece and a second lead-out pole piece, the first lead-out pole piece extends into the gap and is connected to the pole, and the transition pole piece is connected to the first lead-out pole piece and extends to the top position of the battery cell; the second lead-out pole piece is connected to the transition pole piece and extends to the outer edge of the battery cell, and the second lead-out pole pieces of two adjacent battery cells are connected by a connecting piece.

[0007] The external connector can lead the poles in the gaps of two adjacent battery cells out of the gaps for connection. The pole is connected to the first lead-out piece, which extends from the gap to the outside of the gap and is connected to the transition piece. The transition piece is located at the top of the battery cell, which is convenient for observation and subsequent connection processes. The second lead-out piece is connected to the transition piece and extends to the outer edge of the battery cell, so that the second lead-out piece has enough space for connection operations, and the connection operation is located at the outer edge of the battery cell to reduce interference with the battery cell. The connection piece connects the two second lead-out pieces to complete the connection of the two battery cells. The connection work is performed outside the gap, which greatly reduces the difficulty of the connection work.

[0008] Furthermore, the first lead-out piece is provided with a first through hole, and the first through hole is arranged concentrically with the pole.

[0009] The first through hole facilitates observation, and the concentric state of the first through hole and the pole is observed, so that the relative position of the first lead-out piece and the pole is accurate, thereby ensuring the connection accuracy.

[0010] Furthermore, the first lead-out piece is provided with a buckle avoidance area, and the thickness of the buckle avoidance area is smaller than the thickness of the first lead-out piece.

[0011] The thickness of the buckle avoidance area is relatively thin, which is convenient for assembly and limiting. The contact area between the first lead-out piece and the battery pole has a relatively small overcurrent, and the thickness of the first lead-out piece is designed to be thin, which is conducive to lightweight design and material saving.

[0012] Furthermore, the first lead-out piece is provided with a buffer rib, the buffer rib is arranged along the length direction of the first lead-out piece, and the buffer rib is located between the two first through holes.

[0013] Through the above technical solution, the buffer rib can increase the structural strength of the first lead-out piece, and prevent the first lead-out piece from deforming and causing stress concentration due to expansion of the battery unit.

[0014] Furthermore, the transition piece is provided with a collection area, and the collection area is provided with a collection unit.

[0015] The collection unit in the collection area can collect the voltage and temperature of the transition plate area, which is convenient for monitoring the internal status of the battery module and increasing battery safety.

[0016] Furthermore, the second lead-out piece is connected to the base, and the base includes a lap portion, and the lap portion is provided with an embedded nut; the second lead-out piece is provided with a second through hole, and the second lead-out piece, the connecting piece and the base are connected by fasteners, the second through hole and the embedded nut.

[0017] The second lead-out piece can be conveniently connected to the base through the fastener, the embedded nut and the second through hole, and the base can provide support for the second lead-out piece. The base is made of plastic material and plays an insulating role.

[0018] Furthermore, a plurality of buckles are provided on one side of the base relative to the overlapping portion, and the base is also provided with a mounting hole, through which a protective cover is mounted.

[0019] The buckle can press the base onto the crossbeam of the battery box, so that the base can be installed conveniently and reliably. It is convenient to install the protective cover through the mounting hole of the base, and the protective cover can cover the exposed busbar and other components to improve safety.

[0020] Furthermore, a second extension portion and a third extension portion are respectively provided on two adjacent sides of the protective cover, and a gap is left between the second extension portion and the third extension portion.

[0021] The second extension part and the third extension part can shield the exposed busbar of the connecting piece, preventing the entry of foreign objects and the risk of touching the exposed high-voltage parts due to misoperation. The gap reserved between the second extension part and the third extension part allows the second extension part and the third extension part to be deformed more easily under the action of external force, thereby achieving the effect of labor-saving removal of the protective cover.

[0022] Furthermore, the second extension portion is provided with a protective buckle and a protective protrusion, and the protective buckle matches the mounting hole.

[0023] The protective buckle and the mounting hole make it easy to install the base and the protective cover, and the protective protrusion makes it easy for the staff to remove the installed protective cover. The surface of the base and the protective cover is set to orange to serve as a high-voltage warning.

[0024] Furthermore, the external connecting part also includes a tray, and the lead-out electrode is placed in the tray before welding; the tray includes a first supporting portion, a second supporting portion, a first extending portion, a tray clip and a hollow portion, and the first supporting portion extends a plurality of protrusions from the hollow portion and is limited by matching the tray clip; the first extending portion is located at the edge of the second supporting portion and protrudes from the surface of the second supporting portion.

[0025] The tray is used to place the lead-out electrode before welding, and the hollow part allows the lead-out electrode to directly contact and weld with the pole. The first extension part can cover the exposed busbar of the lead-out electrode to prevent foreign objects from entering and the risk of touching the exposed high-voltage parts due to misoperation.

[0026] Compared with the existing known technology, the technical solution provided by the present invention has the following beneficial effects:

[0027] In a battery module of the present invention, a pole is connected to a first lead-out piece, the first lead-out piece extends from a gap to the outside of the gap and is connected to a transition piece, the transition piece is located at the top of the battery cell, and is convenient for observation and subsequent connection processes, the second lead-out piece is connected to the transition piece and extends to the outer edge of the battery cell, so that the second lead-out piece has enough space for connection operation, and the connection operation is located at the outer edge of the battery cell, reducing interference with the battery cell, and the connection work of the two battery cells is completed by connecting the two second lead-out pieces with a connecting piece, and the connection work is performed outside the gap, which greatly reduces the difficulty of the connection work.

[0028] It will be apparent that elements or features described above in the context of a single embodiment may be used alone or in combination in other embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In the drawings, the sizes and proportions do not represent the sizes and proportions of actual products. The drawings are merely illustrative, and some non-essential elements or features are omitted for clarity.

[0030] Figure 1 is a schematic diagram of the connection structure between the battery module and the external connector in an embodiment of the present invention;

[0031] Figure 2 is a schematic structural diagram of an external connector in an embodiment of the present invention;

[0032] Figure 3 Schematic diagram of the connection structure between the lead-out electrode and the base in an embodiment of the present invention;

[0033] Figure 4 It is a schematic structural diagram of the separation state of the lead-out electrode and the tray in an embodiment of the present invention;

[0034] Figure 5It is a schematic structural diagram of the combined state of the lead-out electrode and the tray in an embodiment of the present invention;

[0035] Figure 6 is a structural schematic diagram of a base in an embodiment of the present invention;

[0036] Figure 7 Schematic diagram of the structure of the protective cover in an embodiment of the present invention.

[0037] Description of Reference Numerals

[0038] 100, battery cell; 110, pole; 200, lead-out pole piece; 210, first lead-out piece; 211, first through hole; 212, buckle avoidance area; 213, buffer rib; 220, transition piece; 221, collection area; 230, second lead-out piece; 231, second through hole; 300, tray; 310, first support portion; 320, second support portion; 330, first extension portion; 340, tray buckle; 350, hollow portion; 400, base; 410, overlap portion; 411, embedded nut; 420, mounting hole; 430, buckle; 500, protective cover; 510, second extension portion; 511, protective buckle; 512, protective protrusion; 520, third extension portion; 600, connecting piece. DETAILED DESCRIPTION

[0039] The present invention will be described in detail below with reference to the accompanying drawings. What is described here is only a preferred embodiment of the present invention, and those skilled in the art can think of other ways to implement the present invention based on the preferred embodiment, and other ways also fall within the scope of the present invention.

[0040] Example

[0041] Reference Figure 1-Figure 7 The present embodiment provides a battery module, comprising at least two groups of battery cells 100, wherein poles 110 are arranged on the sides of the battery cells 100, and the battery cells 100 are arranged along the direction where the poles 110 are located; there is a gap between two adjacent battery cells 100, and the poles 110 of the two battery cells 100 are in the gap; the two poles 110 in the gap are each provided with an external connector, and the external connector comprises a lead-out electrode piece 200, and the lead-out electrode piece 200 comprises a first lead-out piece 210, a transition piece 220, and a second lead-out piece 230, wherein the first lead-out piece 210 extends into the gap and is connected to the pole 110, and the transition piece 220 is connected to the first lead-out piece 210 and extends to the top position of the battery cell 100; the second lead-out piece 230 is connected to the transition piece 220 and extends to the outer edge of the battery cell 100, and the second lead-out pieces 230 of two adjacent battery cells 100 are connected by a connecting piece 600.

[0042] The external connector can lead the pole 110 in the gap of two adjacent battery cells 100 out of the gap for connection. The pole 110 is connected to the first lead-out piece 210, and the first lead-out piece 210 extends from the gap to the outside of the gap and connects to the transition piece 220. The transition piece 220 is located at the top of the battery cell 100, which is convenient for observation and subsequent connection processes. The second lead-out piece 230 is connected to the transition piece 220 and extends to the outer edge of the battery cell 100, so that the second lead-out piece 230 has enough space for connection operation, and the connection operation is located at the outer edge of the battery cell 100, reducing interference with the battery cell 100. The connecting piece 600 connects the two second lead-out pieces 230 to complete the connection work of the two battery cells 100. The connection work is performed outside the gap, which greatly reduces the difficulty of the connection work.

[0043] In some embodiments of the present application, Figure 3 As shown, the first lead-out piece 210 is provided with a first through hole 211, and the first through hole 211 is arranged concentrically with the pole 110. The first through hole 211 serves to facilitate observation, and the concentric state of the first through hole 211 and the pole 110 is observed, so that the relative position of the first lead-out piece 210 and the pole 110 is accurate, and the connection accuracy is guaranteed. It can be understood that the number of the first through holes 211 corresponds to the number of the poles 110, and the number in this embodiment is two.

[0044] Furthermore, the contact area between the first lead-out piece 210 and the battery pole 110 has a relatively small overcurrent, and the thickness of the first lead-out piece 210 is designed to be thin, which is conducive to lightweight design and material saving. The first lead-out piece 210 is provided with a buckle avoidance area 212, and the thickness of the buckle avoidance area 212 is less than the thickness of the first lead-out piece 210. The thickness of the buckle avoidance area 212 is thin, which is convenient for assembly and limiting, and can also prevent the displacement caused by battery expansion and reduce the risk of stress pulling of the lead-out pole piece 200. The first lead-out piece 210 is provided with a buffer rib 213, which is arranged along the length direction of the first lead-out piece 210, and the buffer rib 213 is located between the two first through holes 211. The buffer rib 213 can increase the structural strength of the first lead-out piece 210, and prevent the first lead-out piece 210 from deforming due to the expansion of the battery cell 100 and causing stress concentration.

[0045] In some embodiments of the present application, Figure 3 As shown, the transition piece 220 is provided with a collection area 221, and the collection area 221 is provided with a collection unit. The collection unit can collect the voltage and temperature of the transition piece 220 area, which is convenient for monitoring the internal state of the battery module and increasing the safety of battery power use. It can be understood that the collection unit is CCS or FPC. Figure 2 , Figure 3 and Figure 6As shown, the second lead-out piece 230 is connected to the base 400, and the base 400 includes a lap portion 410, and the lap portion 410 is provided with an embedded nut 411; the second lead-out piece 230 is provided with a second through hole 231, and the second lead-out piece 230 and the connecting piece 600 are connected to the base 400 by fasteners, the second through hole 231, and the embedded nut 411. The fasteners cooperate with the embedded nut 411 and the second through hole 231 to facilitate the connection between the second lead-out piece 230 and the base 400, and the base 400 can provide support for the second lead-out piece 230. The base 400 is made of plastic material and plays an insulating role. It can be understood that the fastener can be a fastening bolt, and the thread of the fastening bolt matches the thread of the embedded nut 411. One or more embedded nuts 411 can be provided, and the number of second through holes 231 and fasteners corresponds to the number of embedded nuts 411.

[0046] The base 400 and the second lead-out piece 230 are designed with a structure that is easy to disassemble. Specifically, Figure 6 As shown, a plurality of buckles 430 are provided on one side of the base 400 relative to the overlap portion 410. The buckles 430 can press the base 400 on the crossbeam of the battery box, so that the base 400 can be installed conveniently and reliably. The base 400 is also provided with a mounting hole 420, and a protective cover 500 is installed on the base 400 through the mounting hole 420. It is more convenient to install the protective cover 500 on the base 400 through the mounting hole 420, and the protective cover 500 can cover the exposed busbar and other components to improve safety.

[0047] On the one hand, the protective cover 500 can provide insulation protection, and on the other hand, the protective cover 500 also needs to meet the requirement of easy disassembly. In some embodiments of the present application, such as Figure 7 As shown, the second extension part 510 and the third extension part 520 are respectively provided on the adjacent two sides of the protective cover 500, and a gap is left between the second extension part 510 and the third extension part 520. The second extension part 510 and the third extension part 520 can shield the exposed busbar of the connecting piece 600, preventing the risk of foreign matter entering and touching the exposed high-voltage part due to misoperation. The reserved gap between the second extension part 510 and the third extension part 520 allows the second extension part 510 and the third extension part 520 to be more easily deformed under the action of external force, thereby achieving the effect of labor-saving disassembly of the protective cover 500.

[0048] Furthermore, the second extension 510 is provided with a protective buckle 511 and a protective protrusion 512, and the protective buckle 511 matches the mounting hole 420. The protective buckle 511 matches the mounting hole 420 to make the base 400 and the protective cover 500 easy to install, and the protective protrusion 512 can facilitate the staff to remove the installed protective cover 500. The surface of the base 400 and the protective cover 500 can be set to orange by applying a film or adding a dyeing material, which plays a high-voltage warning role.

[0049] In some embodiments of the present application, the external connector also includes a tray 300, and the lead-out electrode 200 is placed in the tray 300 before welding; the tray 300 includes a first support portion 310, a second support portion 320, a first extension portion 330, a tray buckle 340 and a hollow portion 350, the first support portion 310 extends a plurality of protrusions in the hollow portion 350, and is limited by the matching of the tray buckle 340; the first extension portion 330 is located at the edge of the second support portion 320 and protrudes from the surface of the second support portion 320. The tray 300 is used to place the lead-out electrode 200 before welding, and the hollow portion 350 allows the lead-out electrode 200 to directly contact and weld with the pole 110. The first extension portion 330 can shield the exposed busbar of the lead-out electrode 200 to prevent the entry of foreign objects and the risk of touching the exposed high-voltage parts due to misoperation.

[0050] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "front", "rear", "left", "right", "up", "down", "top", "bottom", "inside", "outside", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0051] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] The protection scope of the present invention is limited only by the claims. With the help of the teachings of the present invention, those skilled in the art will easily recognize that alternative structures of the structures disclosed in the present invention can be used as feasible alternative embodiments, and the embodiments disclosed in the present invention can be combined to generate new embodiments, which also fall within the scope of the appended claims.

Claims

1. A battery module, comprising at least two groups of battery cells (100), wherein the sides of the battery cells (100) are provided with poles (110), and the battery cells (100) are arranged along the direction where the poles (110) are located; there is a gap between two adjacent battery cells (100), and the poles (110) of the two battery cells (100) are located in the gap; characterized in that: The two poles (110) in the gap are each provided with an external connector, the external connector comprising a lead-out pole piece (200), the lead-out pole piece (200) comprising a first lead-out piece (210), a transition piece (220) and a second lead-out piece (230), the first lead-out piece (210) extending into the gap and connected to the pole (110), the transition piece (220) being connected to the first lead-out piece (210) and extending to the top position of the battery unit (100); the second lead-out piece (230) being connected to the transition piece (220) and extending to the outer edge of the battery unit (100), and the second lead-out pieces (230) of two adjacent battery units (100) being connected via a connecting piece (600).

2. A battery module according to claim 1, characterized in that: The first lead-out piece (210) is provided with a first through hole (211), and the first through hole (211) is arranged concentrically with the pole (110).

3. A battery module according to claim 1, characterized in that: The first lead-out piece (210) is provided with a buckle avoidance area (212), and the thickness of the buckle avoidance area (212) is smaller than the thickness of the first lead-out piece (210).

4. A battery module according to claim 2, characterized in that: The first lead-out piece (210) is provided with a buffer rib (213), the buffer rib (213) is arranged along the length direction of the first lead-out piece (210), and the buffer rib (213) is located between the two first through holes (211).

5. A battery module according to claim 1, characterized in that: The transition piece (220) is provided with a collection area (221), and the collection area (221) is provided with a collection unit.

6. A battery module according to claim 1, characterized in that: The second lead-out piece (230) is connected to the base (400), and the base (400) includes a lap portion (410), and the lap portion (410) is provided with an embedded nut (411); the second lead-out piece (230) is provided with a second through hole (231), and the second lead-out piece (230) and the connecting piece (600) are connected to the base (400) by fastening the second through hole (231) and the embedded nut (411).

7. A battery module according to claim 6, characterized in that: A plurality of buckles (430) are provided on one side of the base (400) opposite to the overlapping portion (410), and the base (400) is also provided with a mounting hole (420), and a protective cover (500) is mounted on the base (400) through the mounting hole (420).

8. A battery module according to claim 7, characterized in that: A second extension portion (510) and a third extension portion (520) are respectively provided on two adjacent sides of the protective cover (500), and a gap is left between the second extension portion (510) and the third extension portion (520).

9. A battery module according to claim 8, characterized in that: The second extension portion (510) is provided with a protective buckle (511) and a protective protrusion (512), and the protective buckle (511) matches the mounting hole (420).

10. A battery module according to claim 1, characterized in that: The external connection component also includes a tray (300), and the lead-out electrode (200) is placed in the tray (300) before welding; the tray (300) includes a first support portion (310), a second support portion (320), a first extension portion (330), a tray buckle (340) and a hollow portion (350), wherein the first support portion (310) extends a plurality of protrusions from the hollow portion (350) and is limited by the matching of the tray buckle (340); and the first extension portion (330) is located at the edge of the second support portion (320) and protrudes from the surface of the second support portion (320).

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