Cylindrical battery module

Abstract

The present invention discloses a cylindrical battery module, which belongs to the technical field of power batteries. The cylindrical battery module includes at least two rows of battery cell assemblies, two brackets and a cooling plate. Each row of battery cell assemblies includes a plurality of cylindrical battery cells arranged along a first direction. Two brackets are arranged on both sides of the battery cell assembly along a second direction. The brackets are provided with a plurality of fixing holes. Each cylindrical battery cell is simultaneously plugged into the corresponding fixing holes on the two brackets. The cooling plate is sandwiched between two adjacent rows of battery cell assemblies. The cooling plate is provided with a plurality of arc grooves at intervals along the first direction. A first plug-in portion is formed between two adjacent arc grooves. The arc groove cooperates with the cylindrical battery cells of a row of battery cell assemblies, and the first plug-in portion is inserted into the gap between two adjacent cylindrical battery cells of the same row of battery cell assemblies. The cylindrical battery module of the present invention, the coordination of the bracket and the cooling plate, simplifies the structure of the cylindrical battery module, improves the battery energy density, and improves the cooling effect.

Description

Technical Field

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

[0002] In the prior art, a cylindrical battery module is composed of a plurality of cylindrical battery cells connected in multiple parallel and multiple series. The cylindrical battery module includes a frame with through holes on which the cylindrical battery cells are mounted. The cylindrical battery module has a relatively large volume, which is not conducive to the spatial arrangement of the battery system and affects the energy density of the battery system. In addition, the fixing frame in the existing structure is relatively complex, which further increases the volume of the cylindrical battery module and is inconvenient to assemble, thereby increasing the production cost. In addition, during the use of the battery module, due to the high heat generation, there are great safety hazards, which affects the safety of the cylindrical battery module. The cooling device of the existing structure is relatively large, which will further affect the volume of the cylindrical battery module. Due to the large number of battery cells, the problems of battery cell fixation, battery cell protection and battery cell cooling are all more difficult to solve. Summary of the invention

[0003] The object of the present invention is to provide a cylindrical battery module, improve space utilization, increase the energy density of the cylindrical battery module, and improve the cooling effect.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] A cylindrical battery module includes at least two rows of battery cell assemblies, each row of battery cell assemblies includes a plurality of cylindrical battery cells arranged along a first direction, and the cylindrical battery module also includes:

[0006] Two brackets are arranged on both sides of the battery cell assembly along the second direction, and a plurality of fixing holes are arranged on the brackets, and each cylindrical battery cell is simultaneously plugged into the corresponding fixing holes on the two brackets;

[0007] A cooling plate is sandwiched between two adjacent rows of battery cell assemblies. The cooling plate is provided with a plurality of arc grooves spaced apart along a first direction. A first plug-in portion is formed between two adjacent arc grooves. The arc groove cooperates with the cylindrical battery cells of a row of battery cell assemblies, and the first plug-in portion is inserted into the gap between two adjacent cylindrical battery cells of the same row of battery cell assemblies.

[0008] Optionally, the cylindrical battery module further includes a filling structure, the filling structure includes a keel, a keel is arranged between two adjacent cylindrical battery cells of at least one row of battery cell assemblies, and a first structural adhesive layer is arranged between the keel and the cylindrical battery cells.

[0009] Optionally, the keel is a hollow structure.

[0010] Optionally, the keel and the bracket are detachably connected or bonded.

[0011] Optionally, the cylindrical battery module further includes a filling structure, the filling structure includes a sealant structure, and the sealant structure is filled between two adjacent cylindrical battery cells in at least one row of battery cell assemblies.

[0012] Optionally, the cylindrical battery module further includes a cover plate, which is arranged at an end of the battery cell assembly along the third direction.

[0013] Optionally, the battery cell assembly includes a first row of battery cell assemblies arranged close to the cover plate, no filling structure is arranged between two adjacent cylindrical battery cells of the first row of battery cell assemblies, a plurality of grooves are arranged on the cover plate at intervals, a second plug-in portion is formed between two adjacent grooves, the groove cooperates with the cylindrical battery cell, and the second plug-in portion is inserted into the gap between two adjacent cylindrical battery cells.

[0014] Optionally, the battery cell assembly includes a first row of battery cell assemblies arranged close to the cover plate, a filling structure is arranged between two adjacent cylindrical battery cells in the first row of battery cell assemblies, and the cover plate is a flat plate.

[0015] Optionally, the cylindrical battery module includes at least three rows of battery cell assemblies, and the cooling plate includes a first cooling plate and a second cooling plate; the first row of battery cell assemblies are arranged between the cover plate and the first cooling plate, and the contact area between the first cooling plate and the first row of battery cell assemblies is S1;

[0016] The second row of battery cell assemblies is arranged between the first cooling plate and the second cooling plate, and the contact area between the first cooling plate and the second row of battery cell assemblies is S2; wherein S1>S2.

[0017] Optionally, a heat insulating member is provided on the arc-shaped groove on the first cooling plate close to the second row of battery cell assemblies.

[0018] Optionally, the cylindrical battery cell is bonded or detachably connected to the fixing hole.

[0019] Optionally, a glue groove is provided on one side of the fixing hole close to the cylindrical battery cell, a second structural glue layer is provided on the glue groove, and the cylindrical battery cell is connected to the fixing hole through the second structural glue layer.

[0020] Optionally, the cylindrical battery module further includes bus bars arranged on both sides of the battery cell assembly along the second direction, the bus bars are welded to the poles of the cylindrical battery cells, and a slot is provided on the bracket, on which the bus bars are arranged.

[0021] Optionally, the cylindrical battery module further includes two FPC boards, which are respectively arranged between the bus and the bracket, and the two FPC boards are respectively welded to the bus on the corresponding side and fixedly connected to the bracket.

[0022] Optionally, a connecting piece for connecting to an external box is provided on the bracket.

[0023] Optionally, the cylindrical battery module further includes two insulating sheets, and the two insulating sheets are respectively connected to the brackets on both sides.

[0024] Optionally, the cylindrical battery module further includes a metal reinforcing sheet and compressed foam arranged on both sides of the insulating sheet, and the compressed foam is arranged between the bracket and the insulating sheet.

[0025] Optionally, the surface of the cooling plate is provided with an insulating varnish layer.

[0026] Optionally, a third structural adhesive layer is further provided on the insulating paint layer.

[0027] Optionally, the arc grooves are alternately arranged on both side surfaces of the cooling plate, and the arc grooves on both sides of the cooling plate respectively cooperate with the cylindrical battery cells of two adjacent rows of battery cell assemblies.

[0028] Optionally, the cooling plate is annular, and the water inlet end and the water outlet end of the cooling plate are arranged adjacent to each other, and the water inlet end and the water outlet end are arranged in the middle position of the cooling plate.

[0029] Beneficial effects of the present invention:

[0030] The present invention provides a cylindrical battery module, wherein a bracket is used to fix each cylindrical battery cell on a battery cell assembly, and the cylindrical battery cell is plug-connected to the bracket, which simplifies the bracket structure and is easy to install; a cooling plate is clamped between two adjacent rows of battery cell assemblies, thereby improving the cooling effect of each row of battery cell assemblies; the arrangement of the arc groove and the first plug-in portion, on the one hand, increases the contact area between the cooling plate and the battery cell assembly, thereby further improving the cooling effect; on the other hand, the battery cell assembly, the arc groove and the first plug-in portion can cooperate with each other, which will not increase the volume of the cylindrical battery module, and at the same time, it also plays a role in limiting the cylindrical battery cell, thereby improving the stability of the structure; the cooperation of the bracket and the cooling plate simplifies the structure of the cylindrical battery module, reduces the overall weight, and improves the battery energy density. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is an exploded view of a cylindrical battery module provided by a specific embodiment of the present invention;

[0032] Figure 2 yes Figure 1 A magnified image of point A;

[0033] Figure 3 yes Figure 1 A magnified view of point B;

[0034] Figure 4 It is a structural schematic diagram of a second structural adhesive layer provided on a bracket according to a specific embodiment of the present invention;

[0035] Figure 5 yes Figure 1 Enlarged view of point C;

[0036] Figure 6 It is a structural schematic diagram of a cylindrical battery module provided by a specific embodiment of the present invention;

[0037] Figure 7 is a schematic structural diagram of a water cooling unit provided in a specific embodiment of the present invention;

[0038] Figure 8 yes Figure 7 The enlarged view of point D;

[0039] Fig. 9 is a side view of a water cooling unit provided by a specific embodiment of the present invention;

[0040] Fig.10 yes Fig. 9 The enlarged view of point E;

[0041] Fig.11 is a schematic diagram of the internal structure of a water chamber provided by a specific embodiment of the present invention;

[0042] Fig.12 It is a structural schematic diagram of a keel provided in a specific embodiment of the present invention;

[0043] Fig.13 yes Fig.12 Enlarged view of point F.

[0044] In the figure:

[0045] 100-battery cell assembly; 101-cylindrical battery cell;

[0046] 1-keel; 11-clip; 12-weight reduction hole; 13-arc groove;

[0047] 2-cooling plate; 21-arc groove; 22-first plug-in part; 23-interface; 241-first water pipe; 242-second water pipe; 25-pipe joint assembly; 251-first water inlet pipe joint; 252-first water outlet pipe joint; 253-second water inlet pipe joint; 254-second water outlet pipe joint; 26-water chamber; 261-first subchamber; 262-second subchamber; 263-third subchamber; 264-fourth subchamber; 265-first partition; 266-second partition; 267-first subdivision; 268-second subdivision;

[0048] 3-bracket; 31-fixing hole; 311-glue groove; 312-second structural glue layer; 32-connecting piece; 33-insulating convex strip;

[0049] 4-cover plate; 41-groove; 42-second plug-in portion;

[0050] 5-Insulation sheet;

[0051] 6- busbar;

[0052] 7-FPC board;

[0053] 81- positive output stage;

[0054] 9-Metal reinforcement sheet;

[0055] 10- Seal. DETAILED DESCRIPTION

[0056] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0057] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0059] This embodiment provides a cylindrical battery module, which includes at least two rows of battery cell assemblies 100, two brackets 3 and a cooling plate 2; specifically, Figure 1-Figure 3As shown, each row of battery cell assemblies 100 includes a plurality of cylindrical battery cells 101 arranged along a first direction; two brackets 3 are arranged on both sides of the battery cell assembly 100 along a second direction, and a plurality of fixing holes 31 are arranged on the brackets 3, and each cylindrical battery cell 101 is simultaneously plugged into the corresponding fixing holes 31 on the two brackets 3; the cooling plate 2 is sandwiched between two adjacent rows of battery cell assemblies 100, and a plurality of arc grooves 21 are arranged on the cooling plate 2 at intervals along the first direction, and a first plug-in portion 22 is formed between two adjacent arc grooves 21, and the arc groove 21 cooperates with the cylindrical battery cells 101 of a row of battery cell assemblies 100, and the first plug-in portion 22 is inserted into the gap between two adjacent cylindrical battery cells 101 of the same row of battery cell assemblies 100.

[0060] The two brackets 3 are relatively arranged on both sides of the cylindrical battery cell 101, and the fixing holes 31 provided on the two brackets 3 correspond to each other. The cylindrical battery cell 101 is inserted into the two fixing holes 31, so as to fix the cylindrical battery cell 101. Of course, the number of brackets 3 can be more than two. It should be noted that more than two brackets also include two brackets, so they should also be included in the protection scope of this application. Specifically, as long as the fixing holes 31 on the two brackets 3 are relatively arranged so that the cylindrical battery cell 101 can be inserted into the fixing holes 31 at both ends, the relationship between the second direction and the first direction is not limited. When the cylindrical battery cells 101 are not arranged neatly, the fixing holes 31 on the brackets 3 need to be adaptively adjusted according to the arrangement of the cylindrical battery cells to facilitate plug-in fixation. Preferably, as Figure 1 As shown, the second direction is perpendicular to the first direction, wherein the first direction is the x direction and the second direction is the y direction, the cylindrical battery cells 101 are neatly arranged, the bracket 3 is vertically arranged on both sides of the cylindrical battery cells 101, and neatly arranged fixing holes 31 are opened on the bracket 3, which is convenient for processing the fixing holes 31 and for assembly; the bracket 3 is used to fix each cylindrical battery cell 101 on the battery cell assembly 100, and the cylindrical battery cell 101 is plug-connected with the bracket 3, which simplifies the structure of the bracket 3 and is convenient for installation.

[0061] The cooling plate 2 is sandwiched between two adjacent rows of battery cell assemblies 100, which improves the cooling effect of each row of battery cell assemblies 100; the arrangement of the arc groove 21 and the first plug-in portion 22, on the one hand, increases the contact area between the cooling plate 2 and the battery cell assembly 100, further improving the cooling effect, and on the other hand, the battery cell assembly 100, the arc groove 21 and the first plug-in portion 22 can cooperate with each other, which will not increase the volume of the cylindrical battery module, and at the same time, it also plays a limiting role on the cylindrical battery 101, thereby improving the stability of the structure; the cooperation between the bracket 3 and the cooling plate 2 simplifies the structure of the cylindrical battery module, reduces the overall weight, and improves the battery energy density. Specifically, there is a gap between two adjacent cylindrical battery cells 101, and the gap can be understood as follows: first, the cylindrical battery cells 101 abut against each other, and an arc gap is formed at the top of the two adjacent cylindrical battery cells; second, the two cylindrical battery cells 101 do not abut against each other, forming a gap. Accordingly, the shape of the first plug-in portion 22 can be set according to different gaps.

[0062] In order to ensure uniform cooling of each row of battery cell assemblies 100, a cooling plate 2 is arranged between two adjacent rows of battery cell assemblies 100, that is, the number of cooling plates 2 is one less than the number of rows of battery cell assemblies 100, thereby improving the temperature uniformity of each row of battery cell assemblies 100 and improving the service life of the cylindrical battery module; each cooling plate 2 can be arranged in parallel to improve the cooling uniformity between different cooling plates 2; optionally, the arc groove 21 is arranged tangent to the cylindrical battery cell 101 to increase the contact area between the arc groove 21 and the cylindrical battery cell 101, thereby improving the cooling effect and improving the space utilization rate.

[0063] In the prior art, the cooling plate is plate-shaped, and the water inlet and outlet interfaces connected to the external cooling system are respectively arranged on both sides. The water inlet and outlet interfaces occupy a certain space, which reduces the space utilization rate of the battery module. In addition, the water inlet and outlet interfaces are respectively connected to the pipe joint through water chambers. The large number of water chambers increases the risk of liquid leakage and increases the production cost.

[0064] To solve the above problems, Figure 1 and Figure 7 As shown, the cooling plate 2 is annular, and the water inlet and water outlet of the cooling plate 2 are arranged adjacent to each other, and the water inlet and water outlet are arranged in the middle of the cooling plate 2. The water inlet and water outlet of the cooling plate 2 arranged in annular shape are concentrated in the middle of the cooling plate 2, saving space and improving the space utilization rate of the battery module. Specifically, a pipe joint assembly 25 and a water chamber 26 are arranged on the cooling plate 2, and the pipe joint assembly 25 includes at least two pipe joints, each of which is respectively connected to the water inlet interface arranged at the water inlet end and the water outlet interface arranged at the water outlet end; the water chamber 26 connects the water inlet end, the water outlet end and the pipe joint assembly 25, and the interior of the water chamber 26 is divided into at least two sub-chambers, each of which is respectively connected to the water inlet interface or the water outlet interface.

[0065] The water inlet and outlet of the annular cooling plate 2 are connected to the same water chamber 26, which reduces the number of water chambers 26, simplifies the structure, reduces the assembly of the water chamber 26 and the cooling plate 2, and reduces the cost; reduces the connection between the water chamber 26 and the cooling plate 2, reduces the risk of liquid leakage, and improves the reliability of use; reduces the number of water chambers 26, and saves space; optionally, the water chamber 26 is arranged in the middle of the cooling plate 2, and when the water cooling unit is installed on the battery module, when adjacent rows of battery core assemblies are arranged near the cooling plate 2, the water chamber 26 can be arranged between two cylindrical batteries of adjacent rows of battery core assemblies to reduce the space occupied by the water chamber, further improving the space utilization. Optionally, the water chamber 26 is welded to the cooling plate 2 to improve the connection strength, reduce the number of water chambers 26, and reduce the welding operation, thereby reducing the cost. Specifically, the ring can be a runway shape or an oval shape. The cooling plate 2, the pipe joint assembly 25 and the water chamber 26 form a water cooling unit, and the water cooling unit can also be used alone in other battery modules.

[0066] Optionally, the cooling plate 2 includes at least two water pipes, each of which is arranged in parallel along the length direction of the cylindrical battery cell to increase the width of the cooling plate 2; the coolant in the cooling plate 2 is diverted to improve the circulation effect of the coolant, thereby improving the cooling effect. Specifically, the water chamber 26 is divided into at least four chambers, a part of each chamber is connected to the water inlet interface of each water pipe, and another part of each chamber is connected to the water outlet interface of each water pipe. When two water pipes are provided on the cooling plate 2, the water chamber 26 is divided into four chambers, and the two water inlet interfaces and the two water outlet interfaces are connected to the four chambers one by one; or the water chamber 26 can also be divided into eight chambers, and the eight chambers are divided into four groups, and each group of chambers is connected to the two water inlet interfaces and the two water outlet interfaces one by one; the number of chambers in each group can be different, so the chambers can be set according to the use requirements, so that the water inlet interface and the water outlet interface of each water pipe are connected to different chambers, without limitation.

[0067] As the length of the battery module increases, the length of the cooling plate 2 can also be increased at the same time. When the length of the cooling plate 2 is too long, the cooling of different cylindrical cells by the cooling plate 2 is uneven. To this end, in this embodiment, the water inlet interface of each water pipe and the water outlet interface of the adjacent water pipe are alternately arranged at the same end of the cooling plate 2, so that the cooling water in the two adjacent water pipes circulates in opposite directions, and the same cylindrical cell may be cooled by the head of one water pipe and the tail of another water pipe at the same time, thereby improving the cooling balance of different cylindrical cells and reducing the temperature difference between different cylindrical cells.

[0068] Optionally, the water chamber 26 includes two columns of chambers, each of which is connected to the water inlet and the water outlet respectively; each column of chambers includes multiple chambers, each chamber on a column of chambers is connected to one end of each water pipe close to one side of the corresponding column of chambers, and each chamber on another column of chambers is connected to the other end of each water pipe. The chamber structure is simple, which facilitates the connection between the chamber and the water inlet and outlet interfaces of each water pipe. In this embodiment, Fig.11 As shown, the water chamber 26 includes a first partition 265 and a second partition 266. The first partition 265 divides the water chamber into two rows of large sub-chambers, and the second partition 266 divides each row of large sub-chambers into two sub-chambers. Depending on the number of water pipes, a plurality of second partitions 266 can be provided on the water chamber 26 to divide each large sub-chamber into a plurality of sub-chambers.

[0069] In this embodiment, Figure 7 , Figure 8 and Fig.11 As shown, the cooling plate 2 includes a first water pipe 241 and a second water pipe 242, the two ends of the first water pipe 241 are respectively connected to a first water outlet pipe joint 252 and a first water inlet pipe joint 251, the two ends of the second water pipe 242 are respectively connected to a second water outlet pipe joint 254 and a second water inlet pipe joint 253, and the water chamber 26 is divided into a first sub-chamber 261, a second sub-chamber 262, a third sub-chamber 263 and a fourth sub-chamber 264. Among them, the first subchamber 261 and the third subchamber 263 are arranged near one end of each water pipe, and the second subchamber 262 and the fourth subchamber 264 are arranged near the other end of each water pipe; the first subchamber 261 is respectively connected with the first water outlet pipe joint 252 and the water outlet interface of the first water pipe 241; the second subchamber 262 is respectively connected with the first water inlet pipe joint 251 and the water inlet interface of the first water pipe 241; the third subchamber 263 is respectively connected with the second water inlet pipe joint 253 and the water inlet interface of the second water pipe 242; the fourth subchamber 264 is respectively connected with the second water outlet pipe joint 254 and the water outlet interface of the second water pipe 242; the structure is simple, and the coolant in the first water pipe 241 and the second water pipe 242 circulates in opposite directions, thereby improving the cooling effect of the cylindrical battery cell.

[0070] Optionally, the water chamber 26 includes a liquid inlet connected to the pipe joint and a liquid outlet connected to the cooling plate 2, and the inner diameter of the liquid inlet is larger than the inner diameter of the liquid outlet. When the coolant flows from the external cooling system to the cooling plate 2, the water chamber 26 plays a buffering role to reduce the impact force of the coolant on the cooling plate 2. In this embodiment, if Fig. 9 and Fig.10As shown, the water chamber 26 includes a first division 267 and a second division 268, the first division 267 is provided with a liquid inlet, the second division 268 is provided with a liquid outlet, the internal volume of the first division 267 is larger than the internal volume of the second division 268, and the first division 267 and the second division 268 can be connected by an inclined plate; optionally, the first division 267 and the second division 268 can also be connected by an arc plate, and the arc plate cooperates with the cylindrical battery cell to improve space utilization; in other embodiments, the water chamber 26 can also be set to a funnel-shaped structure or the like, which is not limited here.

[0071] Optionally, the cooling plate 2 is provided with an arc groove for matching with the cylindrical battery cell, which reduces the space occupied by the cooling plate 2 and improves the space utilization of the battery module. Figure 2 As shown, specifically, the arc grooves 21 are alternately arranged on both side surfaces of the cooling plate 2, and the arc grooves 21 on both sides of the cooling plate 2 respectively cooperate with the cylindrical cells 101 of two adjacent rows of cell assemblies 100; the cross-section of the cooling plate 2 forms a wave shape, the arc grooves 21 on the first side form the first plug-in portion 22 on the second side, and the arc grooves 21 on the second side form the first plug-in portion 22 on the first side, which fully utilizes the structure of the cooling plate 2, reduces the thickness of the cooling plate 2, and reduces the volume of the battery module; when the volume of the cylindrical battery module is constant, the space utilization rate of the cylindrical cell 101 is improved, thereby improving the energy density of the cylindrical battery module.

[0072] Optionally, the contact arc between the cylindrical battery cell 101 and the arc groove 21 is 55°-65°, and the contact arc of the arc groove 21 is 55°-65°, so as to avoid the contact arc being too large to reduce the space utilization along the first direction, and to avoid the contact arc being too small to reduce the space utilization in the arrangement direction of each row of battery cell components. Preferably, the contact arc is 60°.

[0073] In order to reduce the insulation risk between the battery cell and the water cooling unit, in this embodiment, a cooling plate 2 made of insulating material is selected. Preferably, the cooling plate 2 is made of insulating metal materials such as aluminum or stainless steel, which can both insulate and improve the structural strength, thereby improving the reliability of use. Optionally, an insulating layer is provided on the cooling plate 2, thereby further improving the insulation performance of the cooling plate 2 and effectively reducing the risk of leakage.

[0074] In other embodiments, an insulating paint layer may also be provided on the surface of the cooling plate 2 to prevent electrical conduction between the cooling plate 2 and the cylindrical battery cell 101 when leakage occurs, thereby improving safety. Specifically, a third structural adhesive layer is also provided on the insulating paint layer to bond the cooling plate 2 to the cylindrical battery cell 101, thereby improving the connection strength.

[0075] Specifically, the bracket 3 can be made of plastic material, which can meet the strength requirement and reduce the weight, thereby improving the energy density of the cylindrical battery module.

[0076] In order to improve the relative installation stability between two adjacent cylindrical battery cells 101, optionally, the filling structure can be a sealant structure, and the cylindrical battery cells 101 are filled by applying sealant, and the cylindrical battery cells 101 are fixed by forming a sealant structure; optionally, the filling structure can also be a keel 1, and a keel 1 is arranged between two adjacent cylindrical battery cells 101 of at least one row of battery cell assemblies 100, and a first structural adhesive layer is arranged between the keel 1 and the cylindrical battery cells 101, and the first thermal conductive structural adhesive layer bonds the keel 1 and the first structural adhesive layer, thereby improving the structural strength between the cylindrical battery cells 101, reducing the application of glue, and improving production efficiency.

[0077] Specifically, Fig.12 and Fig.13 As shown, the length of the keel 1 is adapted to the length of the cylindrical battery cell 101, increasing the contact area and improving the installation stability; optionally, the keel 1 is provided with an arc groove 13 that matches the cylindrical battery cell 101 in the width direction, and the arc groove 13 fits the outer circumference of the cylindrical battery cell 101 to increase the contact area and improve the installation stability, while reducing the volume of the keel 1, thereby reducing the volume occupied by the cylindrical battery cell 101 in the arrangement direction. Optionally, the keel 1 is set to a hollow structure to reduce the weight of the keel 1, thereby reducing the weight of the cylindrical battery module; specifically, a pair of weight-reducing holes 12 are opened on the keel 1 in the height direction for easy processing, and the weight-reducing holes 12 can be square holes or circular holes, etc., and can be through holes or blind holes, which are set according to actual needs.

[0078] During assembly, glue can be applied on the surface of the keel 1 to form a first structural glue layer, and then the keel 1 can be installed; further optionally, a hollow groove is provided on the arc groove 13 where the keel 1 cooperates with the cylindrical battery cell 101. When applying glue, glue is applied on the hollow groove and then bonded to the cylindrical battery cell 101. The hollow groove can support the keel 1 to prevent the keel 1 from deforming, and can also provide a glue application space for the first structural glue layer, which is convenient for positioning the glue and assembling the keel 1.

[0079] Optionally, both ends of the keel 1 along the length direction can be bonded to the bracket 3 to improve the structural strength; Fig.12 and Fig.13The keel 1 is provided with buckles at both ends along the length direction, and correspondingly, the bracket 3 is provided with a slot, and the buckle is snapped into the slot, so that the keel 1 and the bracket 3 form a detachable connection through the buckle snap connection, which is convenient for structural disassembly and assembly; more specifically, two buckles 11 can be provided at each end, and the snap connection directions of the two buckles 11 are opposite, so as to avoid loosening between the buckle 11 and the slot during movement in one direction, thereby further improving the connection reliability between the keel 1 and the bracket 3.

[0080] Optionally, the cylindrical battery module further includes a cover plate 4, which is arranged at the end of the battery cell assembly 100 along the third direction to prevent the external structure from causing impact damage to the battery cell assembly 100. The cover plate 4 can be adaptively arranged according to the specific arrangement structure of the battery cell assembly 100. In this embodiment, Figure 1 and Figure 6 As shown, the battery cell assemblies 100 are neatly arranged, and the third direction is the z direction, which is perpendicular to the first direction and the second direction for easy assembly.

[0081] In this embodiment, the battery cell assembly 100 includes a first row of battery cell assemblies 100 disposed near the cover plate 4. When no filling structure is disposed between two adjacent cylindrical battery cells 101 of the first row of battery cell assemblies 100, a plurality of grooves 41 are disposed on the cover plate 4 at intervals, and a second plug-in portion 42 is formed between two adjacent grooves 41. The groove 41 cooperates with the cylindrical battery cell 101, and the second plug-in portion 42 is inserted into the gap between two adjacent cylindrical battery cells 101. The second plug-in portion 42 and the groove 41 on the cover plate 4 cooperate with the cylindrical battery cell 101, which can replace the keel 1 or the sealant structure to play a filling role, and is also used to limit the cylindrical battery cell 101, and can play a role in improving the structural strength between the cylindrical battery cells 101. Refer to Figure 1 In this embodiment, the cylindrical battery module includes two cover plates 4 arranged at the upper and lower ends of multiple rows of battery cell assemblies 100 along the third direction. The battery cell assemblies 100 in the top row and the battery cell assemblies 100 in the bottom row are limited and reinforced by the cover plates 4. The battery cell assemblies 100 arranged in the middle row can be fixed by the keel 1 or the sealant structure. At the same time, the upper and lower cover plates 4 can also protect the battery cell assemblies 100.

[0082] In other embodiments, the battery cell assembly 100 includes a first row of battery cell assemblies 100 arranged close to the cover plate 4, and when a filling structure such as a keel 1 or a sealant structure is arranged between two adjacent cylindrical battery cells 101 of the first row of battery cell assemblies 100, the cover plate 4 is a flat plate; a keel 1 or a sealant structure is arranged between each row of battery cell assemblies 100, so that the structures of each row of battery cell assemblies 100 are the same, the structure of the cover plate 4 is simple, and production is convenient, thereby reducing costs.

[0083] Specifically, the cover plate 4 can be made of plastic material, which can meet the strength requirements and reduce the weight, thereby improving the energy density of the cylindrical battery module.

[0084] Further optionally, the cylindrical battery module includes at least three rows of battery cell assemblies 100, and the cooling plate 2 includes a first cooling plate and a second cooling plate. In this embodiment, the first cooling plate and the second cooling plate are the upper and lower layers of the annular cooling plate 2; the first row of battery cell assemblies 100 are arranged between the cover plate 4 and the first cooling plate, and the contact area between the first cooling plate and the first row of battery cell assemblies 100 is S1; the second row of battery cell assemblies 100 are arranged between the first cooling plate and the second cooling plate, and the contact area between the first cooling plate and the second row of battery cell assemblies 100 is S2; wherein, S1>S2. Since the second row of battery cell assemblies 100 are cooled simultaneously by the double-sided cooling plates 2, the cooling effect thereof is stronger than that of the first row of battery cell assemblies 100 which are cooled only by the single-sided cooling plate 2, and the cooling uniformity is improved by changing the contact area between the first row of battery cell assemblies 100 and the second row of battery cell assemblies 100 and the cooling plate 2. Specifically, an insulating member is provided on the arc groove 21 near the second row of battery cell assemblies 100 on the first cooling plate to change the contact angle between the second row of battery cell assemblies 100 and the two adjacent arc grooves 21, reduce the contact area between the second row of battery cell assemblies 100 and the cooling plate 2, reduce the cooling effect, and thus improve the cooling uniformity between the second row of battery cell assemblies 100 and the first row of battery cell assemblies 100. Optionally, the insulating member can be a plastic insulating sheet bonded to the arc groove 21. How to set the size of the insulating member can be determined according to thermal simulation calculations, etc. The insulating member can also be an insulating coating, which will not be repeated.

[0085] Optionally, the cylindrical battery cell 101 is bonded or detachably connected to the fixing hole 31, thereby improving the connection strength between the battery cell assembly 100 and the bracket 3. Figure 3-Figure 5 As shown, a glue groove 311 is provided on one side of the fixing hole 31 close to the cylindrical battery cell 101, and a second structural glue layer 312 is provided on the glue groove 311. The cylindrical battery cell 101 is connected to the fixing hole 31 through the second structural glue layer 312, thereby improving the connection strength between the cylindrical battery cell 101 and the bracket 3; specifically, glue can be injected into the glue groove 311 by a glue injection device to form the second structural glue layer 312, and then the cylindrical battery cell 101 is installed on the fixing hole 31, and then the second structural glue layer 312 is naturally cured. Further specifically, the second structural glue layer 312 can be arranged on the bottom wall of the glue groove 311, so that the cylindrical battery cell 101 is bonded to the bottom wall of the groove, and the second structural glue layer 312 can also be arranged on the side wall of the glue groove 311, so that the cylindrical battery cell 101 is bonded to the side wall of the groove. In other embodiments, a buckle can also be provided on the fixing hole 31, and the cylindrical battery cell 101 and the bracket 3 are engaged by the buckle.

[0086] Alternatively, if Figure 1 , Figure 5 and Figure 6 As shown, the two sides of the bracket 3 are provided with connecting pieces 32 for connecting with the external box body. Specifically, the cylindrical battery module is fixedly connected with the external box body through the connecting pieces 32 on both sides, which improves the installation stability of the cylindrical battery module. Specifically, a through hole is opened on the connecting piece 32, and the fastener passes through the through hole to fix the cylindrical battery module on the external box body and other structures. In this embodiment, the connecting piece 32 and the bracket 3 are an integral structure, which improves the structural strength of the connecting piece 32; in other embodiments, the connecting piece 32 and the bracket 3 can also be a separate structure, and the connecting piece 32 can be bonded or connected to the bracket 3 by fasteners, or the connecting piece 32 can be a metal reinforcing piece 9 embedded in the bracket 3, which is easy to operate. Optionally, a steel sleeve can be added to the connecting piece 32, and the fastener is connected to the outside through the steel sleeve to improve the structural strength and avoid the wear of the connecting piece during multiple disassembly and assembly.

[0087] Optionally, the cylindrical battery module further includes two insulating sheets 5 to improve the insulation of the cylindrical battery module; the two insulating sheets 5 are respectively connected to the brackets 3 on both sides to fix the insulating sheets 5; specifically, the connecting sheet 32 ​​and the insulating sheet 5 can be bonded, or can be connected by snap-fit ​​or bolts to facilitate disassembly and assembly. Optionally, a sealing member is also provided between the insulating sheet 5 and the bracket 3 to improve the sealing.

[0088] Optionally, the cylindrical battery module further includes busbars 6 arranged on both sides of the battery cell assembly 100 along the second direction, the busbars 6 are welded to the poles of the cylindrical battery cell 101, and the bracket 3 is provided with a slot, and the busbars 6 are arranged on the slot, so that the connection structure of the busbars 6 is stable, thereby improving the performance of the cylindrical battery module. Specifically, as Figure 5 As shown, the bracket 3 is provided with an insulating convex strip 33 , which forms a slot for installing the busbar 6 . The insulating convex strip 33 can insulate and block adjacent busbars 6 and facilitate positioning and installation; the insulating convex strip 33 can be bonded to the bracket 3 .

[0089] Optionally, the cylindrical battery module also includes two FPC boards 7 (Flexible Printed Circuit, flexible circuit boards), the two FPC boards 7 are respectively welded to the bus 6 on the corresponding side, the two FPC boards 7 are respectively arranged between the bus 6 and the bracket 3, and the FPC boards 7 are fixedly connected to the bracket 3 on the corresponding side, such as by hot riveting or welding. The connection strength is improved, the structure is simplified, and it is convenient for insulation protection; specifically, laser welding can be used for welding.

[0090] Specifically, Figure 1 and Figure 6As shown, the cylindrical battery module also includes a positive output stage 81 and a negative output stage arranged at both ends, and the positive output stage 81 and the negative output stage are respectively connected to the busbars 6 on both sides.

[0091] To improve safety in use, optionally, the cylindrical battery module also includes a metal reinforcement sheet 9 and compressed foam arranged on both sides of the insulating sheet 5. The compressed foam is arranged between the bracket 3 and the insulating sheet 5, and the metal reinforcement sheet 9 is arranged on the outermost side to compress the compressed foam and ensure the compression amount of the compressed foam. When the cylindrical battery cell 101 leaks, the compressed foam will prevent the leaked liquid from penetrating into the electrical connection part, thereby reducing the risk of short circuit and other safety hazards.

[0092] Reference Figure 6 Optionally, an opening is provided on the cover plate 4, and two connection interfaces 23 are provided on the cooling plate 2, namely a liquid inlet and a liquid outlet, and the two structures pass through the openings respectively and are connected to the external cooling system.

[0093] In this embodiment, the cylindrical battery module includes a three-layer battery cell assembly 100. Optionally, the assembly steps of the cylindrical battery module include:

[0094] S1, sequentially install the cover plate 4 arranged at the lower end, the battery cell assembly 100, the cooling plate 2, the battery cell assembly 100 and the cover plate 4 arranged at the upper end; when a multi-layer battery cell assembly 100 is included, the cooling plate 2 and the battery cell assembly 100 are alternately installed in sequence;

[0095] S2, gluing the keel 1, and installing the keel 1 between the cylindrical battery cells 101 of the battery cell assembly 100;

[0096] S3, glueing of bracket 3;

[0097] S4, sequentially install the bracket 3, busbar 6, FPC board 7, compressed foam, insulating sheet 5, seal 10, and metal reinforcing sheet 9 arranged on the same side;

[0098] S5, sequentially install the bracket 3, bus bar 6, FPC board 7, compressed foam, insulating sheet 5, sealing member 10, and metal reinforcing sheet 9 arranged on the other side.

[0099] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A cylindrical battery module, comprising at least two rows of battery cell assemblies (100), each row of the battery cell assemblies (100) comprising a plurality of cylindrical battery cells (101) arranged along a first direction, characterized in that: The cylindrical battery module also includes: Two brackets (3) are arranged on both sides of the battery cell assembly (100) along the second direction, the brackets (3) are provided with a plurality of fixing holes (31), and each of the cylindrical battery cells (101) is simultaneously plugged into a corresponding fixing hole (31) on the two brackets (3); A cooling plate (2) is sandwiched between two adjacent rows of the battery cell assemblies (100), the cooling plate (2) is provided with a plurality of arc-shaped grooves (21) at intervals along the first direction, a first plug-in portion (22) is formed between two adjacent arc-shaped grooves (21), the arc-shaped grooves (21) cooperate with the cylindrical battery cells (101) of a row of the battery cell assemblies (100), and the first plug-in portion (22) is inserted into a gap between two adjacent cylindrical battery cells (101) of the same row of the battery cell assemblies (100); The cylindrical battery module further comprises a filling structure, the filling structure comprising a keel (1), the keel (1) being arranged between two adjacent cylindrical battery cells (101) of at least one row of the battery cell assemblies (100), and a first structural adhesive layer being arranged between the keel (1) and the cylindrical battery cells (101); the keel (1) being a hollow structure; the keel (1) and the bracket (3) being detachably connected or bonded; Alternatively, the cylindrical battery module further comprises a filling structure, the filling structure comprising a sealant structure, and the sealant structure is filled between two adjacent cylindrical battery cells (101) of at least one row of the battery cell assemblies (100); The cooling plate (2) is annular, and a water inlet end and a water outlet end of the cooling plate (2) are arranged adjacent to each other, and the water inlet end and the water outlet end are arranged at a middle position of the cooling plate (2) along the first direction.

2. The cylindrical battery module according to claim 1, characterized in that: The cylindrical battery module further comprises a cover plate (4), wherein the cover plate (4) is arranged at an end of the battery cell assembly (100) along a third direction.

3. The cylindrical battery module according to claim 2, characterized in that: The battery cell assembly (100) comprises a first row of battery cell assemblies (100) arranged close to the cover plate (4); the filling structure is not arranged between two adjacent cylindrical battery cells (101) of the first row of battery cell assemblies (100); a plurality of grooves (41) are arranged at intervals on the cover plate (4); a second plug-in portion (42) is formed between two adjacent grooves (41); the grooves (41) cooperate with the cylindrical battery cells (101), and the second plug-in portion (42) is inserted into the gap between the two adjacent cylindrical battery cells (101).

4. The cylindrical battery module according to claim 2, characterized in that: The battery cell assembly (100) comprises a first row of battery cell assemblies (100) arranged close to the cover plate (4), a filling structure being arranged between two adjacent cylindrical battery cells (101) of the first row of battery cell assemblies (100), and the cover plate (4) being a flat plate.

5. The cylindrical battery module according to claim 2, characterized in that: The cylindrical battery module comprises at least three rows of battery cell assemblies (100), and the cooling plate (2) comprises a first cooling plate and a second cooling plate; the first row of battery cell assemblies (100) are arranged between the cover plate (4) and the first cooling plate, and the contact area between the first cooling plate and the first row of battery cell assemblies (100) is S1; The second row of battery cell assemblies (100) are arranged between the first cooling plate and the second cooling plate, and a contact area between the first cooling plate and the second row of battery cell assemblies (100) is S2; wherein S1>S2.

6. The cylindrical battery module according to claim 5, characterized in that: A heat insulating member is provided on the arc-shaped groove (21) on the first cooling plate close to the second row of battery cell assemblies (100).

7. The cylindrical battery module according to claim 1, characterized in that: The cylindrical battery core (101) is bonded or detachably connected to the fixing hole (31).

8. The cylindrical battery module according to claim 7, characterized in that: A glue groove (311) is provided on a side of the fixing hole (31) close to the cylindrical battery core (101), a second structural glue layer (312) is provided on the glue groove (311), and the cylindrical battery core (101) is connected to the fixing hole (31) via the second structural glue layer (312).

9. The cylindrical battery module according to claim 1, characterized in that: The cylindrical battery module further comprises bus bars (6) arranged on both sides of the battery cell assembly (100) along the second direction, the bus bars (6) being welded to the poles of the cylindrical battery cell (101), and the bracket (3) being provided with a slot, and the bus bars (6) being arranged on the slot.

10. The cylindrical battery module according to claim 9, characterized in that: The cylindrical battery module further comprises two FPC boards (7), the two FPC boards (7) being respectively arranged between the busbar (6) and the bracket (3), the two FPC boards (7) being respectively welded to the busbar (6) on the corresponding side, and being fixedly connected to the bracket (3).

11. The cylindrical battery module according to claim 1, characterized in that: The bracket (3) is provided with a connecting piece (32) for connecting to an external box.

12. The cylindrical battery module according to claim 11, characterized in that: The cylindrical battery module further comprises two insulating sheets (5), wherein the two insulating sheets (5) are respectively connected to the brackets (3) on both sides.

13. The cylindrical battery module according to claim 12, characterized in that: The cylindrical battery module further comprises a metal reinforcement sheet (9) and compressed foam arranged on both sides of the insulating sheet (5); the compressed foam is arranged between the bracket (3) and the insulating sheet (5).

14. The cylindrical battery module according to claim 1, characterized in that: The surface of the cooling plate (2) is provided with an insulating paint layer.

15. The cylindrical battery module according to claim 14, characterized in that: A third structural adhesive layer is also arranged on the insulating paint layer.

16. The cylindrical battery module according to claim 1, characterized in that: The arc-shaped grooves (21) are alternately arranged on both side surfaces of the cooling plate (2), and the arc-shaped grooves (21) on both sides of the cooling plate (2) respectively cooperate with the cylindrical battery cells (101) of two adjacent rows of battery cell assemblies (100).

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