Battery module and battery pack

Abstract

The invention discloses a battery module which comprises a positive electrode fixing bracket, a negative electrode fixing bracket, at least one battery pack and at least one end part fixing piece, the battery pack comprises a plurality of cylindrical single batteries which are sequentially connected in series, at least one of the positive pole fixing bracket and the negative pole fixing bracket is provided with a multilateral mounting hole, the positive pole end of the battery pack is arranged on the positive pole fixing bracket, and the negative pole end of the battery pack is arranged on the negative pole fixing bracket; the end fixing piece is provided with a polygonal part matched with the polygonal mounting hole, the end fixing piece is arranged at the end of the battery pack in a sleeving mode, and the polygonal part is embedded in the polygonal mounting hole. The problem that a cylindrical battery circumferentially rotates on a fixing support is solved.

Description

Technical Field

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

[0002] As an energy storage carrier, batteries are widely used in various fields. Existing battery packs usually include a shell and a battery module arranged in the shell. In particular, in a battery module composed of cylindrical batteries, the battery module usually includes a plurality of single cells connected in sequence, and a row of battery cells connected in sequence is a battery pack. A fixing bracket is arranged at least at the head and tail ends of the battery pack along the axial direction, and the two ends of the battery pack are directly plugged into the pre-arranged mounting holes on the fixing bracket.

[0003] Since the single cells of the battery pack are of a cylindrical structure, the battery pack inserted in the mounting hole is prone to rotation, which leads to a problem of low mounting stability. Summary of the invention

[0004] In order to overcome at least one of the defects of the prior art described above, the present invention provides a battery module and a battery pack to solve the problem of circumferential rotation of cylindrical batteries on a fixed bracket.

[0005] A battery module comprises a positive electrode fixing bracket, a negative electrode fixing bracket, at least one battery pack and at least one end fixing member;

[0006] The battery pack comprises a plurality of cylindrical single cells connected in series in sequence, at least one of the positive electrode fixing bracket and the negative electrode fixing bracket is provided with a multi-sided mounting hole, the positive terminal of the battery pack is arranged on the positive electrode fixing bracket, and the negative terminal of the battery pack is arranged on the negative electrode fixing bracket;

[0007] The end fixing piece is provided with a polygonal portion adapted to the polygonal mounting hole, the end fixing piece is sleeved on the end of the battery pack, and the polygonal portion is embedded in the polygonal mounting hole.

[0008] Further, the end fixing piece is arranged at the positive end of the battery pack, the positive electrode fixing bracket is provided with at least one multi-sided mounting hole, and the negative electrode fixing bracket is provided with at least one supporting mounting hole;

[0009] The end fixing piece of the positive terminal is inserted into the multi-sided mounting hole of the positive terminal fixing bracket, and the negative terminal of the battery pack is inserted into the supporting mounting hole of the negative terminal fixing bracket.

[0010] Further, two opposite outer side walls of the positive electrode fixing bracket are defined as positive electrode fixing side surfaces, and at least one positive electrode fixing block is disposed on the positive electrode fixing side surfaces;

[0011] Or, the two opposite outer side walls of the positive electrode fixing bracket are defined as positive electrode fixing side surfaces, and at least one positive electrode fixing block is disposed on the positive electrode fixing side surfaces, and the two opposite outer side walls of one negative electrode fixing bracket are defined as negative electrode fixing side surfaces, and at least one negative electrode fixing block is disposed on one negative electrode fixing side surfaces;

[0012] Or, it also includes an intermediate fixing bracket, the intermediate fixing bracket is provided with a middle mounting hole, the intermediate fixing bracket is provided with a middle mounting hole, and the middle part of a group of the battery packs is passed through one of the middle mounting holes;

[0013] The two opposite outer sides of the positive electrode fixing bracket are defined as positive electrode fixing sides, and at least one positive electrode fixing block is arranged on the positive electrode fixing side. The two opposite outer sides of the negative electrode fixing bracket are defined as negative electrode fixing sides, and at least one negative electrode fixing block is arranged on the negative electrode fixing side. The two opposite outer sides of the intermediate fixing bracket are defined as intermediate fixing sides, and at least one intermediate fixing block is arranged on the intermediate fixing side.

[0014] Furthermore, the positive electrode fixing bracket is provided with at least one positive electrode heat dissipation channel;

[0015] Or, the positive electrode fixing bracket is provided with at least one positive electrode heat dissipation channel, and the negative electrode fixing bracket is provided with at least one negative electrode heat dissipation channel;

[0016] Along the axial direction of a group of battery packs, one positive electrode heat dissipation channel and one negative electrode heat dissipation channel are aligned;

[0017] Or, one of the positive electrode fixing brackets is provided with at least one positive electrode heat dissipation channel, one of the negative electrode fixing brackets is provided with at least one negative electrode heat dissipation channel, and one of the intermediate fixing brackets is provided with at least one intermediate heat dissipation channel, and along the axial direction of the battery pack, the positive electrode heat dissipation channel, the negative electrode heat dissipation channel and the intermediate heat dissipation channel are aligned.

[0018] Further, two opposite outer side walls of one of the intermediate fixing brackets are defined as intermediate fixing side surfaces, and the intermediate fixing bracket is provided with at least one first connecting portion and a second connecting portion adapted to the first connecting portion;

[0019] The second connection portion and at least one of the first connection portions are respectively arranged at one end of the middle fixed side surface.

[0020] Furthermore, the end fixing piece is screwed to the positive terminal and / or the negative terminal of the battery pack.

[0021] A battery pack, comprising a housing and a battery module as claimed in any one of claims 1 to 4;

[0022] The shell comprises a top cover and a body, the battery module is placed in the body, and the top cover is covered on the body.

[0023] Furthermore, it also includes a cooling fan, which is arranged at the end of the battery module along the axial direction of the battery pack to conduct heat dissipation in the axial direction of the battery pack;

[0024] An air outlet is arranged on a side plate at at least one end of the main body along the axial direction of the battery module.

[0025] Furthermore, a first positioning portion is provided at the inner bottom of the shell, and the bottom of the battery module is positioned and installed on the first positioning portion;

[0026] And / or, a second positioning portion is provided on one side surface of the top cover, and when the top cover is closed on the body, the second positioning portion is snap-fitted and positioned at the top of the battery module.

[0027] Furthermore, it also includes a conductive connecting sheet;

[0028] There are multiple battery modules, and the conductive connecting sheet is used to interconnect the positive electrodes of the multiple battery modules and to interconnect the negative electrodes of the multiple battery modules.

[0029] In summary, the battery module and battery pack provided by the present invention have the following technical effects:

[0030] The battery pack is plugged into the polygonal mounting holes through the polygonal portions on the end fixings. The polygonal plug-in method simply and effectively limits the rotational movement of the battery pack, improves the stability of the battery pack installation in the battery module, avoids problems such as falling or circuit breaking caused by possible displacement of the battery pack during the use of the battery module, and improves the safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of the structure of a single battery module according to an embodiment of the present invention;

[0032] Figure 2 An exploded schematic diagram of a single battery module according to an embodiment of the present invention;

[0033] Figure 3 for Figure 2 A schematic diagram of the structure of the positive electrode fixing bracket;

[0034] Figure 4 for Figure 2 A schematic diagram of the structure of the negative electrode fixing bracket;

[0035] Figure 5 for Figure 2 A schematic diagram of the structure of the intermediate fixing bracket;

[0036] Figure 6 for Figure 5 Enlarged view of part A in the middle;

[0037] Figure 7 for Figure 5 Enlarged view of middle part B;

[0038] Figure 8 for Figure 2 A schematic diagram of the structure of the end fixing member;

[0039] Fig. 9 for Figure 2 A schematic diagram of the structure of the series connection parts;

[0040] Fig.10 A first structural schematic diagram of a plurality of battery modules according to an embodiment of the present invention;

[0041] Fig.11 A second structural schematic diagram of a plurality of battery modules according to an embodiment of the present invention;

[0042] Fig.12 A schematic diagram of the assembly structure of a battery module and a cooling fan according to an embodiment of the present invention;

[0043] Fig.13 A schematic diagram of the structure of a battery pack according to an embodiment of the present invention;

[0044] Fig.14 Schematic diagram of an explosion of a battery pack according to an embodiment of the present invention.

[0045] The meanings of the reference numerals are as follows:

[0046] 10. Battery pack; 11. Cylindrical single battery; 20. Positive electrode fixing bracket; 21. Multi-sided mounting hole; 22. Positive electrode fixing block; 23. Positive electrode heat dissipation channel; 30. Negative electrode fixing bracket; 31. Support mounting hole; 32. Negative electrode fixing block; 33. Negative electrode heat dissipation channel; 40. End fixing member; 41. Plug-in protrusion; 42. Base; 50. Middle fixing bracket; 51. Middle mounting hole; 52. Middle fixing block; 53. Middle heat dissipation channel; 54. First connecting part; 55. Second connecting part; 60. Shell; 61. Top cover; 62. Main body; 621. Air outlet; 70. Series connection; 80. Cooling fan; 90. Positive electrode terminal; 12. Negative electrode terminal; 13. Conductive connecting piece; 14. Power port. DETAILED DESCRIPTION

[0047] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0048] In the description of the present invention, it should be noted that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0050] The battery pack provides the function of storing electrical energy and supplying power in electronic devices. It is usually formed by connecting one or more battery modules, and a battery module is composed of multiple battery cells connected in series or in parallel to meet the device's requirements for power and voltage. In addition, the battery pack will also include a battery management system (BMS) connected to the battery, which is used to monitor the status of the battery and ensure the safety of the battery pack.

[0051] See also Figure 1 and Figure 2 The present invention discloses a battery module, comprising a positive electrode fixing bracket 20, a negative electrode fixing bracket 30, at least one battery pack 10 and at least one end fixing member 40; the battery pack 10 comprises a plurality of cylindrical single batteries 11 connected in series in sequence, at least one of the positive electrode fixing bracket 20 and the negative electrode fixing bracket 30 is provided with a polygonal mounting hole 21, the positive terminal of the battery pack 10 is arranged on the positive electrode fixing bracket 20, and the negative terminal of the battery pack 10 is arranged on the negative electrode fixing bracket 30; the end fixing member 40 is provided with a polygonal portion adapted to the polygonal mounting hole 21, the end fixing member 40 is sleeved on the end of the battery pack, and the polygonal portion is embedded in the polygonal mounting hole 21.

[0052] A single battery pack 10 includes five cylindrical single batteries 11 , and the five cylindrical single batteries 11 are connected in series in sequence to form a battery pack 10 . The cylindrical single batteries 11 can be connected to each other by welding or other methods.

[0053] The positive electrode fixing bracket 20 and the negative electrode fixing bracket 30 are preferably square plates, and the positive electrode fixing bracket 20 is preferably provided with a through-type polygonal mounting hole 21 at the center, and the negative electrode fixing bracket 30 is preferably provided with a through-type support mounting hole 31 at the center. In particular, the polygonal mounting hole 21 can be selected as a triangular hole, a quadrilateral hole, etc. In this embodiment, the polygonal mounting hole 21 is a regular hexagonal hole, and the support mounting hole 31 is selected as a circular hole.

[0054] See also Figure 8 Correspondingly, the end fixing member 40 includes a regular hexagonal plug-in protrusion 41 adapted to the polygonal mounting hole 21, and the plug-in protrusion 41 protrudes from the positive end of the battery pack 10. During assembly, the plug-in protrusion 41 is plugged into the polygonal mounting hole 21, and the last cylindrical single battery 11 at the other end of the battery pack 10 is plugged into the supporting mounting hole 31. In this way, after the above-mentioned polygonal plug-in protrusion 41 and the polygonal mounting hole 21 are plugged, the plug-in protrusion 41 cannot rotate in the polygonal mounting hole 21, thereby preventing the battery pack 10 from rotating in the circumferential direction.

[0055] Other possible implementations include, first, the positive electrode fixing bracket 20 is provided with a support mounting hole 31, the negative electrode fixing bracket 30 is provided with a polygonal mounting hole 21, and the corresponding end fixing piece 40 is provided at the negative end of the battery pack 10. Second, both the positive electrode fixing bracket 20 and the negative electrode fixing bracket 30 are provided with a polygonal mounting hole 21, and the positive end and the negative end of the corresponding battery pack 10 are provided with an end fixing piece 40 respectively.

[0056] In the above, the battery pack 10 completes the circumferential limit, and this embodiment also adds the axis limit. Specifically, the support mounting hole 31 is set as a step hole, and the cylindrical single battery 11 at the negative position of the battery pack 10 is inserted into the hole with a large radius of the support mounting hole 31, and its end is abutted against the step surface. The polygonal mounting hole 21 itself has the function of axial limit. Here, a circular hole is set on one end of the polygonal mounting hole 21, which is used for inserting the cylindrical single battery 11 at the positive position of the battery pack 10, so as to provide safe support for the cylindrical single battery 11 at the positive position of the battery pack 10.

[0057] In addition, in order to facilitate the connection between the plug-in protrusion 41 and the cylindrical single battery 11, the end fixing member 40 also includes a base 42, the plug-in protrusion 41 is connected to one end of the base 42, the base 42 is provided with an external thread, and the end of the cylindrical single battery 11 is provided with an internal thread, and the internal and external threads are screwed together to achieve quick and convenient installation. In addition, the plug-in protrusion 41 is provided with a threaded hole, and when the external circuit is connected to the cylindrical single battery 11 through the plug-in protrusion 41, the external circuit can be screwed to the plug-in protrusion 41 by bolts. Similarly, the negative end of the cylindrical single battery 11 at the negative end of a battery pack 10 can also be provided with an end fixing member 40, which is also used for connecting external circuits.

[0058] See also Fig. 9Preferably, a series connection 70 is provided between the cylindrical single cells 11. In combination with the above, the ends of the cylindrical single cells 11 are provided with internal threads. Here, it can be limited that both ends of the cylindrical single cells 11 can be provided with internal threads of the same specification, and the series connection 70 is introduced. The two ends of the series connection 70 are also provided with external threads. Two adjacent cylindrical single cells 11 are respectively screwed to one end of the series connection 70 to be electrically connected. In the above, both ends of the cylindrical single cells 11 are provided with unified internal threads, thereby realizing a unified connection structure between multiple cylindrical single cells 11, and improving the convenience of connecting and installing the battery pack 10. In addition, the series connection 70 is designed as a hollow structure to reduce its own weight.

[0059] In other embodiments, the number of battery packs 10 of a battery module can be four (the four battery packs 10 are connected according to the prior art, which will not be described here), and correspondingly, the number of the polygonal mounting holes 21 on the positive electrode fixing bracket 20 is four, and the number of the supporting mounting holes 31 on the negative electrode fixing bracket 30 is also four. Preferably, the four polygonal mounting holes 21 of the positive electrode fixing bracket 20 are arranged in pairs, and the connecting line of the centers of the two polygonal mounting holes 21 arranged in pairs is parallel to the same side line of the positive electrode fixing bracket 20, and the four supporting mounting holes 31 of the negative electrode fixing bracket 30 are arranged with reference to the four polygonal mounting holes 21.

[0060] See also Figure 3 Optionally, two opposite outer side walls of the positive electrode fixing bracket 20 are defined as positive electrode fixing sides, and at least one positive electrode fixing block 22 is arranged on the positive electrode fixing side.

[0061] Among them, in the height direction of the positive electrode fixing bracket 20, the top surface and the bottom surface of the positive electrode fixing bracket 20 are each provided with a strip-shaped positive electrode fixing block 22. Specifically, the positive electrode fixing block 22 is extended along the long side of the surface, and the positive electrode fixing block 22 is used to be clamped and fixed with a specific groove when the positive electrode fixing bracket 20 is installed.

[0062] More preferably, there are two positive electrode fixing blocks 22 on the same surface of the positive electrode fixing bracket 20 , and the two positive electrode fixing blocks 22 are arranged in sequence along the long side of the positive electrode fixing bracket 20 .

[0063] Optionally, the positive electrode fixing bracket 20 is provided with at least one positive electrode heat dissipation channel 23 .

[0064] The positive electrode heat dissipation channel 23 is preferably a heat dissipation hole, and its axial direction is parallel to the axial direction of the multi-sided mounting hole 21. In this embodiment, the heat dissipation hole is an open hole, and a positive electrode heat dissipation channel 23 is provided on each of two opposite sides.

[0065] See also Figure 4Optionally, two opposite outer side walls of the negative electrode fixing bracket 30 are defined as negative electrode fixing sides, and at least one negative electrode fixing block 32 is arranged on the negative electrode fixing side.

[0066] Among them, in the height direction of the negative electrode fixing bracket 30, the top surface and the bottom surface of the negative electrode fixing bracket 30 are each provided with a strip-shaped negative electrode fixing block 32. Specifically, the negative electrode fixing block 32 is extended along the long side of the surface, and the negative electrode fixing block 32 is used to be clamped and fixed with a specific groove when the negative electrode fixing bracket 30 is installed.

[0067] More preferably, there are two negative electrode fixing blocks 32 on the same surface of the negative electrode fixing bracket 30 , and the two negative electrode fixing blocks 32 are arranged in sequence along the long side of the negative electrode fixing bracket 30 .

[0068] Optionally, the negative electrode fixing bracket 30 is provided with at least one negative electrode heat dissipation channel 33 .

[0069] Along the axial direction of a battery pack 10 , the positive electrode heat dissipation channel 23 and the negative electrode heat dissipation channel 33 are aligned.

[0070] The negative electrode heat dissipation channel 33 is preferably a heat dissipation hole, and its axial direction is parallel to the axial direction of the support mounting hole 31. In this embodiment, the heat dissipation hole is an open hole, and a negative electrode heat dissipation channel 33 is provided on each of two opposite sides.

[0071] See also Figure 5 Optionally, a middle fixing bracket 50 is further included. A middle mounting hole 51 is provided on the middle fixing bracket 50 . The middle of a battery pack 10 is passed through a middle mounting hole 51 .

[0072] Among them, the middle fixing bracket 50 can be a square plate, and the middle mounting hole 51 is a through hole for the battery pack 10 to pass through; it can be understood that one battery pack 10 in a battery module corresponds to one middle mounting hole 51, and the number thereof corresponds one to one.

[0073] Optionally, two opposite outer side walls of an intermediate fixing bracket 50 are defined as intermediate fixing side surfaces, and at least one intermediate fixing block 52 is disposed on an intermediate fixing side surface.

[0074] Among them, in the height direction of the intermediate fixing bracket 50, the top surface and the bottom surface of the intermediate fixing bracket 50 are each provided with a strip-shaped intermediate fixing block 52. Specifically, the intermediate fixing block 52 is extended along the long side of the surface, and the intermediate fixing block 52 is used to be clamped and fixed with a specific groove when the intermediate fixing bracket 50 is installed.

[0075] More preferably, there are two intermediate fixing blocks 52 on the same surface of the intermediate fixing bracket 50 , and the two intermediate fixing blocks 52 are arranged in sequence along the long side of the intermediate fixing bracket 50 .

[0076] Optionally, the intermediate fixing bracket 50 is provided with at least one intermediate heat dissipation channel 53. Along the axial direction of a group of battery packs 10, the positive heat dissipation channel 23, the negative heat dissipation channel 33 and the intermediate heat dissipation channel 53 are aligned.

[0077] The middle heat dissipation channel 53 is preferably a heat dissipation hole, and its axial direction is parallel to the axial direction of the support mounting hole 31. In this embodiment, the heat dissipation hole is an open hole, and a middle heat dissipation channel 53 is provided on two opposite sides.

[0078] Importantly, in the present embodiment, in the axial direction of the battery pack 10 , a positive electrode heat dissipation channel 23 , a negative electrode heat dissipation channel 33 and an intermediate heat dissipation channel 53 are aligned to form an air passage.

[0079] In addition, the aforementioned positive electrode heat dissipation channel 23 , negative electrode heat dissipation channel 33 and intermediate heat dissipation channel 53 may be correspondingly arranged at the center or other positions in the middle of the positive electrode fixing bracket 20 , the negative electrode fixing bracket 30 and the intermediate fixing bracket 50 .

[0080] See also Fig.13 and Fig.14 The present invention also relates to a battery pack, comprising a housing 60 and the above-mentioned battery module; the housing 60 comprises a top cover 61 and a body 62 , the battery module is placed in the body 62 , and the top cover 61 covers the body 62 to encapsulate the battery module in the body 62 .

[0081] The shell 60 is a rectangular parallelepiped structure, and the top cover 61 is covered on the opening of the shell 60 to complete the covering.

[0082] See also Fig.12 Optionally, the battery pack further includes a cooling fan 80, which is disposed at the end of the battery module along the axial direction of the battery pack 10 to conduct air flow and dissipate heat in the axial direction of the battery pack 10. An air outlet 621 is disposed on the side panel of at least one end of the body 62 along the axial direction of the battery module.

[0083] Among them, a cooling fan 80 is provided at at least one end of the battery module. In the embodiment with only one cooling fan 80, the air outlet 621 is arranged on the side panel of the body 62 close to the cooling fan 80, and the cooling fan 80 blows air in a direction away from the battery module to guide the heat of the battery module outward. Of course, when there are two cooling fans 80, the two cooling fans 80 can blow air in the same direction at the same time. In addition, the aforementioned air passage can provide a channel for the airflow of this embodiment and speed up the circulation of the gas.

[0084] Optionally, a first positioning portion is provided at the inner bottom of the housing 60, and the bottom of the battery module is positioned and installed on the first positioning portion. And / or, a second positioning portion is provided on one side of the top cover 61, and when the top cover 61 is covered with the body 62, the second positioning portion is snap-fitted and positioned at the top of the battery module.

[0085] Among them, the inner bottom of the shell 60 is provided with a first positioning portion, specifically, the first positioning portion is a first positioning groove, and the length, width and height of the positive electrode fixing bracket 20, the negative electrode fixing bracket 30 and the intermediate fixing bracket 50 can be defined as being consistent, so that one battery module is provided with three parallel first positioning grooves, and when the battery module is installed in the body 62, the positive electrode fixing bracket 20, the negative electrode fixing bracket 30 and the intermediate fixing bracket 50 can be installed one-to-one in one first positioning groove. In addition, the second positioning portion of the top cover 61 is a second positioning groove, and of course, the second positioning groove can also be provided with reference to the first positioning groove, except that one is at the top and the other is at the bottom.

[0086] Furthermore, it is mentioned above that the tops and bottoms of the positive electrode fixing bracket 20, the negative electrode fixing bracket 30 and the intermediate fixing bracket 50 are respectively provided with the positive electrode fixing block 22, the negative electrode fixing block 32 and the intermediate fixing block 52. The positive electrode fixing block 22, the negative electrode fixing block 32 and the intermediate fixing block 52 are used to be plugged and fixed with the above-mentioned first positioning groove and the second positioning groove, so at this time, the first positioning groove and the second positioning groove can correspond to these three one by one.

[0087] See also Fig.10 and Fig.11 Optionally, the battery pack further includes a conductive connecting sheet 13; there are multiple battery modules, and the conductive connecting sheet 13 is used to connect the multiple battery modules.

[0088] Among them, taking two battery modules as an example, one battery module includes four battery groups 10. The four battery groups 10 of the same battery module are grouped in pairs. In the height direction of the battery module, the two battery groups 10 arranged above and below are grouped together, and the negative ends of the battery groups 10 of the same group are connected by a conductive connecting piece 13; in the width direction of the battery module, the two battery groups 10 arranged on the left and right are grouped together, and one group is selected to connect the positive ends of the two battery groups 10 through a conductive connecting piece 13, and the other two groups of battery groups 10 of the two battery modules are selected to connect the two positive ends of the two groups of battery groups 10 through a conductive connecting piece 13, thereby realizing that multiple battery modules are connected to form a multi-module battery pack. It is achievable that the conductive connecting piece 13 is a rectangular plate. In the above, the positive and negative ends of each battery group 10 are provided with end fixing members 40, and a through hole is provided on the conductive connecting piece 13, and a screw or the like can be screwed into the threaded hole of the plug-in protrusion 41 through the through hole.

[0089] In particular, in the above two battery modules, in addition to being connected via the conductive connecting sheet 13, in this embodiment, the connection between the two middle fixing brackets 50 of the two adjacent battery modules is expanded.

[0090] See also Figure 6 and Figure 7 Optionally, two opposite outer side walls of an intermediate fixing bracket 50 are defined as intermediate fixing side surfaces, and the intermediate fixing bracket 50 is provided with at least one first connecting portion 54 and a second connecting portion 55 adapted to the first connecting portion 54; the second connecting portion 55 and the first connecting portion 54 are respectively provided on the two intermediate fixing side surfaces.

[0091] Among them, as mentioned above, a first connecting portion 54 is set on one of the left and right sides of the intermediate fixing bracket 50, and a second connecting portion 55 is set on the other side. The first connecting portion 54 of one intermediate fixing bracket 50 and the second connecting portion 55 of the other intermediate fixing bracket 50 of two adjacent intermediate fixing brackets 50 are detachably connected, thereby improving the connection tightness of the middle parts of two adjacent battery modules.

[0092] Preferably, the first connection part 54 includes an L-shaped claw hook, and two opposite side walls of the intermediate fixing bracket 50 are each provided with a claw hook at a position with the same height, so as to form a gripping position between the two. Similarly, a gripping groove is respectively provided on the two opposite side walls provided with the claw hook, and a claw hook is gripped in a gripping groove, thereby completing the connection between two adjacent intermediate fixing brackets 5. When a first connection part 54 is provided, it can be provided at the middle position of the side wall. In this embodiment, the two first connection parts 54 are respectively provided at both ends of the side wall ( Figure 5 the upper and lower ends).

[0093] Alternatively, on two opposite side walls, one is provided with a T-block and the other is provided with a T-slot, and the two intermediate fixing brackets 50 can also be connected by the engagement of the T-block and the T-slot.

[0094] In addition, it can be known that the battery pack usually also includes a battery management system (BMS), a positive terminal 90 and a negative terminal 12, etc. The battery management system (BMS) is arranged in the housing 60 and is electrically connected to the battery module. One end of the positive terminal 90 and the negative terminal 12 are electrically connected to the battery module respectively, and the other end extends out of the body 62 through the side panel at one end of the body 62. In addition, a power port 14 electrically connected to the cooling fan 80 can also be provided on the side panel at the same end of the body 62. The power port 14 is used as an input port of an external power supply to provide electrical energy for the normal operation of the cooling fan 80. Of course, this side panel can also be provided with various signal detection line holes, and various line holes are connected to the battery management system (BMS) through corresponding lines.

[0095] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical schemes composed of any combination of the above-mentioned technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also regarded as the protection scope of the present invention.

Claims

1. A battery module, characterized in that: It comprises a positive electrode fixing bracket (20), a negative electrode fixing bracket (30), at least one battery pack (10) and at least one end fixing member (40); The battery pack (10) comprises a plurality of cylindrical single batteries (11) connected in series in sequence, at least one of the positive electrode fixing bracket (20) and the negative electrode fixing bracket (30) is provided with a multi-sided mounting hole (21), the positive terminal of the battery pack (10) is arranged on the positive electrode fixing bracket (20), and the negative terminal of the battery pack (10) is arranged on the negative electrode fixing bracket (30); The end fixing piece (40) is provided with a polygonal portion adapted to the polygonal mounting hole (21); the end fixing piece (40) is sleeved on the end of the battery pack, and the polygonal portion is embedded in the polygonal mounting hole (21).

2. The battery module according to claim 1, characterized in that: The end fixing member (40) is arranged at the positive end of the battery pack (10), the positive electrode fixing bracket (20) is provided with at least one multi-sided mounting hole (21), and the negative electrode fixing bracket (30) is provided with at least one supporting mounting hole (31); The end fixing piece (40) of the positive terminal is inserted into the multi-sided mounting hole (21) of the positive terminal fixing bracket (20), and the negative terminal of the battery pack (10) is inserted into the supporting mounting hole (31) of the negative terminal fixing bracket (30).

3. The battery module according to claim 1 or 2, characterized in that: Two opposite outer side walls of the positive electrode fixing bracket (20) are defined as positive electrode fixing side surfaces, and at least one positive electrode fixing block (22) is arranged on the positive electrode fixing side surfaces; Or, two opposite outer side walls of the positive electrode fixing bracket (20) are defined as positive electrode fixing side surfaces, and at least one positive electrode fixing block (22) is disposed on the positive electrode fixing side surfaces; two opposite outer side walls of one negative electrode fixing bracket (30) are defined as negative electrode fixing side surfaces, and at least one negative electrode fixing block (32) is disposed on the negative electrode fixing side surfaces; Or, it further comprises an intermediate fixing bracket (50), wherein the intermediate fixing bracket (50) is provided with a middle mounting hole (51), wherein the middle part of a group of the battery packs (10) is passed through one of the middle mounting holes (51); The two opposite outer side walls of the positive electrode fixing bracket (20) are defined as positive electrode fixing side surfaces, and at least one positive electrode fixing block (22) is arranged on the positive electrode fixing side surfaces; the two opposite outer side walls of the negative electrode fixing bracket (30) are defined as negative electrode fixing side surfaces, and at least one negative electrode fixing block (32) is arranged on the negative electrode fixing side surfaces; the two opposite outer side walls of the intermediate fixing bracket (50) are defined as intermediate fixing side surfaces, and at least one intermediate fixing block (52) is arranged on the intermediate fixing side surfaces.

4. The battery module according to claim 3, characterized in that: The positive electrode fixing bracket (20) is provided with at least one positive electrode heat dissipation channel (23); Or, the positive electrode fixing bracket (20) is provided with at least one positive electrode heat dissipation channel (23), and the negative electrode fixing bracket (30) is provided with at least one negative electrode heat dissipation channel (33); Along the axial direction of a group of the battery packs (10), one of the positive electrode heat dissipation channels (23) and one of the negative electrode heat dissipation channels (33) are aligned and arranged; Alternatively, one of the positive electrode fixing brackets (20) is provided with at least one positive electrode heat dissipation channel (23), one of the negative electrode fixing brackets (30) is provided with at least one negative electrode heat dissipation channel (33), and one of the intermediate fixing brackets (50) is provided with at least one intermediate heat dissipation channel (53), and along the axial direction of the battery pack (10), the positive electrode heat dissipation channel (23), the negative electrode heat dissipation channel (33) and the intermediate heat dissipation channel (53) are arranged in alignment.

5. The battery module according to claim 3, characterized in that: Two opposite outer side walls of one of the intermediate fixing brackets (50) are defined as intermediate fixing side surfaces, and the intermediate fixing bracket (50) is provided with at least one first connecting portion (54) and a second connecting portion (55) adapted to the first connecting portion (54); The second connection portion (55) and at least one of the first connection portions (54) are each arranged at one end of the middle fixed side surface.

6. The battery module according to claim 3, characterized in that: The end fixing member (40) is screwed to the positive terminal and / or the negative terminal of the battery pack (10).

7. A battery pack, characterized in that: A battery module comprising a housing (60) and a battery module as claimed in any one of claims 1 to 6; The housing (60) comprises a top cover (61) and a body (62), the battery module is placed in the body (62), and the top cover (61) covers the body (62).

8. The battery pack according to claim 7, characterized in that: It also includes a cooling fan (80) arranged along the axial direction of the battery pack (10) at the end of the battery module to conduct heat dissipation in the axial direction of the battery pack (10); An air outlet (621) is provided on a side plate at at least one end of the body (62) along the axial direction of the battery module.

9. The battery pack according to claim 7, characterized in that: The inner bottom of the housing (60) is provided with a first positioning portion, and the bottom of the battery module is positioned and installed on the first positioning portion; And / or, a second positioning portion is provided on one side surface of the top cover (61), and when the top cover (61) is covered on the body (62), the second positioning portion is snap-fitted and positioned at the top of the battery module.

10. The battery pack according to claim 7, characterized in that: Also includes a conductive connecting sheet (13); There are multiple battery modules, and the conductive connecting sheet (13) is used to interconnect the positive electrodes of multiple battery modules and to interconnect the negative electrodes of multiple battery modules.

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