Battery pack

Abstract

The utility model relates to the technical field of lithium batteries, in particular to a battery pack which comprises a battery module and a liquid cooling plate, wherein the battery module comprises a battery cell module, the battery cell module comprises a battery cell shell and a battery cell assembly arranged in the battery cell shell, and heat-conducting glue is filled between the battery cell assembly and the battery cell shell; the battery cell assembly comprises a plurality of battery cells, and heat-conducting glue is filled between any two adjacent battery cells; the battery cell shell is in contact with the liquid cooling plate, and heat-conducting glue is filled between the battery cell shell and the liquid cooling plate. The heat in the battery module is taken away along the path of the battery cell, the heat-conducting glue, the battery cell shell, the heat-conducting glue, the liquid cooling plate and the cooling medium, so that the temperature rise in the battery module is reduced, and the service life of the battery module is effectively prolonged; and the number of the battery cell modules, the number of the battery cells in each battery cell module and the placement direction of the battery cells can be adjusted, so that the assembling process of the battery module is simplified, the series-parallel connection structure of the battery module can be adjusted, and the requirements of different customers can be met.

Description

Technical Field

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

[0002] At present, the industry has increasingly higher requirements for the energy density of lithium battery modules. Battery modules will develop towards larger capacity or higher voltage platforms. Therefore, the number of cells in the battery modules is also increasing, and heat generation is increasing. After the internal heat accumulates, it is easy to cause the battery module life to decline. Utility Model Content

[0003] The purpose of the present application is to provide a battery pack, which to some extent solves the technical problem existing in the prior art that as the energy density requirements of lithium battery modules become higher and higher, the number of battery cells in the battery modules is also constantly increasing, the internal heat of the lithium battery modules is easily accumulated, and the battery module life is easily shortened.

[0004] The present application provides a battery pack, comprising: a battery module and a liquid cooling plate; wherein the battery module comprises a cell module, the cell module comprises a cell shell and a cell assembly disposed in the cell shell, and a thermal conductive adhesive is filled between the cell assembly and the cell shell;

[0005] The battery core assembly includes a plurality of the battery cores, and thermal conductive adhesive is filled between any two adjacent battery cores; the battery core housing is in contact with the liquid cooling plate, and thermal conductive adhesive is filled between them.

[0006] In the above technical solution, further, the battery cell module also includes a module bracket, and an opening is formed at the top of the battery cell shell along the height direction of the battery cell, and the module bracket is arranged at the top opening of the battery cell shell; along the height direction of the battery cell, a pole ear is formed at the top of the battery cell, and the pole ear is inserted into the installation through hole of the module bracket.

[0007] In any of the above technical solutions, further, the battery cell module also includes an inter-cell bracket, the inter-cell bracket is built into the battery cell assembly to separate the battery cell assembly into a first battery cell assembly and a second battery cell assembly, and the first battery cell assembly and the second battery cell assembly each include a plurality of battery cells arranged sequentially along a first preset direction;

[0008] Along the height direction of the battery cell, the inter-cell bracket is supported below the module bracket; along the width direction of the module bracket, two sides of the inter-cell bracket respectively abut against two opposite inner side walls of the battery cell housing.

[0009] In any of the above technical solutions, further, the inter-cell bracket is detachably connected to the cell housing.

[0010] In any of the above technical solutions, further, along the height direction of the battery cell, the inner wall of the bottom end of the battery cell housing is provided with a protrusion protruding toward the battery cell side.

[0011] In any of the above technical solutions, further, the battery module also includes an end plate, an end foam and a cover plate; wherein the number of the battery cell modules is multiple, and they are arranged in sequence along the second preset direction to form a battery cell module assembly;

[0012] There are two end plates, which are respectively arranged at the two ends of the battery module assembly along the second preset direction, and the end foam is arranged between any end plate and the battery module assembly; along the height direction of the battery module assembly, the cover plate is arranged at the top end of the battery module assembly, and the liquid cooling plate is arranged at the bottom end of the battery module assembly; the cover plate and the pole ear are spaced apart to form an installation space.

[0013] In any of the above technical solutions, further, the battery module also includes a pressing member, the pressing member is pressed on the upper surface of the cover plate away from the battery module assembly, and the pressing member is detachably connected to the end plate.

[0014] In any of the above technical solutions, further, the battery module also includes a binding strap, and the binding strap is bound to the outside of the battery cell module and the two end plates.

[0015] In any of the above technical solutions, further, the battery module also includes a bus and a connecting copper bus; wherein the bus is arranged in the installation space formed between the cover plate and the pole ears of the battery cell; the second preset direction is the same as the first preset direction, so that all the first battery cell assemblies of the battery module are arranged in one column along the second preset direction, and all the second battery cell assemblies of the battery module are arranged in another column along the second preset direction, and the two adjacent battery cells in each column are electrically connected through the bus; the connecting copper bus is electrically connected to the first battery cell assembly and the second battery cell assembly, respectively.

[0016] In any of the above technical solutions, further, the battery module also includes a fastening member, and the end plate is detachably connected to the liquid cooling plate via the fastening member.

[0017] In any of the above technical solutions, further, the battery cell shell includes a first battery cell shell and a second battery cell shell, and the first battery cell shell and the second battery cell shell are detachably connected.

[0018] In any of the above technical solutions, further, the first battery cell shell and the second battery cell shell are connected by snap-fitting.

[0019] In any of the above technical solutions, further, the battery pack also includes a cover shell, an auxiliary mounting beam and a reinforcement beam; wherein, the number of the auxiliary mounting beams is multiple, and all are fixed to the liquid cooling plate; the multiple auxiliary mounting beams and the liquid cooling plate are arranged to form a groove, and the battery module is arranged in the groove; the cover shell is buckled on the outside of the battery module, and is abutted against and connected to the auxiliary mounting beam; the reinforcement beam is arranged at the bottom of the liquid cooling plate.

[0020] In any of the above technical solutions, further, the battery cell assembly also includes an intermediate foam, and the intermediate foam is arranged between any two adjacent battery cells.

[0021] In any of the above technical solutions, further, the battery cell housing and the liquid cooling plate are both made of metal.

[0022] In any of the above technical solutions, further, the battery cell housing and the liquid cooling plate are both made of aluminum alloy.

[0023] Compared with the prior art, the beneficial effects of this application are:

[0024] In the battery pack provided in the present application, the battery cell and the battery cell shell are bonded and fixed by thermal conductive adhesive, and the battery cell shell and the liquid cooling plate are bonded and fixed by thermal conductive structural adhesive. The heat generated by the charging and discharging of the battery cell is taken away along the path of "battery cell → thermal conductive adhesive → battery cell shell → thermal conductive adhesive → liquid cooling plate → cooling medium", thereby reducing the temperature rise in the battery module, making the battery module operate within a reasonable temperature range, and effectively improving the life of the battery module.

[0025] In addition, foam is filled between adjacent battery cells, which can effectively absorb the expansion of the battery cells during charging and discharging; the battery cell shell includes a first battery cell shell and a second battery cell shell, and the two shells are snap-fitted and fixed to apply appropriate pressure to the battery cells, thereby effectively extending the service life of the battery module.

[0026] In addition, the number of battery modules, the number of battery cells in each battery module, and the placement direction of the battery cells can be adjusted. While simplifying the battery module assembly process, the series and parallel structure of the battery module can be adjusted. For different customer needs, namely different needs for the nominal voltage and nominal capacity of the battery module, the solution can be quickly adjusted to shorten the battery module development cycle.

[0027] In addition, when the battery module is assembled and fixed, the space behind the end plate and the compressed end foam is used to set the straps. The straps are strong and can constrain the size of the battery module while reducing the number of battery module fixing structural parts and simplifying the battery module assembly process.

[0028] In addition, the lower end of the battery cell shell is provided with a protrusion protruding toward the battery cell, which can effectively avoid direct contact between the bottom corner of the battery cell and the shell, causing poor insulation voltage resistance. The battery cell shell and the bracket between the battery cells also support the module bracket, which effectively increases the support strength under the bus and maintains the high consistency of the welding surface, thereby achieving the effect of reducing the welding defect rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 An exploded view of a battery pack provided in an embodiment of the present application;

[0031] Figure 2 An exploded view of a battery module provided in an embodiment of the present application;

[0032] Figure 3 An assembly diagram of a battery module provided in an embodiment of the present application;

[0033] Figure 4 An exploded diagram of a battery cell module provided in an embodiment of the present application;

[0034] Figure 5 An assembly diagram of a battery cell module provided in an embodiment of the present application;

[0035] Figure 6 Another assembly diagram of a battery cell module provided in an embodiment of the present application;

[0036] Figure 7 Another assembly diagram of the battery cell module provided in the embodiment of the present application;

[0037] Figure 8 for Figure 7 Cross-sectional view along section AA;

[0038] Fig. 9 for Figure 8 A schematic diagram of the enlarged structure at B;

[0039] Fig.10 Another assembly diagram of the battery cell module provided in the embodiment of the present application;

[0040] Fig.11 A schematic diagram of the structure of a liquid cooling plate provided in an embodiment of the present application;

[0041] Fig.12 Another schematic diagram of the structure of the liquid cooling plate provided in the embodiment of the present application;

[0042] Fig.13 Another assembly diagram of a battery module provided in an embodiment of the present application;

[0043] Fig.14 Another assembly diagram of the battery module provided in the embodiment of the present application;

[0044] Fig.15 An assembly diagram of a battery pack provided in an embodiment of the present application.

[0045] Reference numerals:

[0046] 1-battery module, 11-cell module, 111-cell shell, 1111-first cell shell, 1112-second cell shell, 1113-protrusion, 1114-flange, 1115-first buckle, 1116-first card hole, 112-first cell assembly, 113-second cell assembly, 114-cell, 115-middle foam, 12-end plate, 13-end foam, 14-cover plate, 15-pressed component, 16-binding strap, 17-bus, 18-connecting copper bus, 19-bus, 110-fastening component, 2-liquid cooling plate, 3-module bracket, 4-inter-cell bracket, 5-cover, 6-auxiliary mounting beam, 7-reinforcement beam, 8-groove. DETAILED DESCRIPTION

[0047] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0048] The components of the embodiments of the present application generally described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0049] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0050] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

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

[0052] Refer to the following Figures 1 to 15 A battery pack according to some embodiments of the present application is described.

[0053] See also Figures 1 to 4 , Fig.15 As shown, an embodiment of the present application provides a battery pack, comprising: a battery module 1 and a liquid cooling plate 2; wherein the battery module 1 comprises a battery cell module 11, the battery cell module 11 comprises a battery cell housing 111 and a battery cell 114 component disposed in the battery cell housing 111, and a thermal conductive adhesive is filled between the battery cell 114 component and the battery cell housing 111;

[0054] The battery cell 114 assembly includes a plurality of battery cells 114 , and a thermal conductive adhesive is filled between any two adjacent battery cells 114 ; the battery cell housing 111 is in contact with the liquid cooling plate 2 , and a thermal conductive adhesive is filled between the battery cell housing 111 .

[0055] Based on the structure described above, it can be seen that the heat in the battery module 1 is taken away along the path of "battery cell 114 → thermal conductive adhesive → battery cell housing 111 → thermal conductive adhesive → liquid cooling plate 2 → cooling medium", thereby reducing the temperature rise in the battery module 1 and effectively improving the life of the battery module 1.

[0056] Moreover, the number of battery cell modules 11, the number of battery cells 114 in each battery cell module 11, and the placement direction of the battery cells 114 can be adjusted, which simplifies the battery module 1 grouping process and adjusts the series-parallel structure of the battery module 1 to meet different customer needs, namely different requirements for the nominal voltage and nominal capacity of the battery module 1.

[0057] In this embodiment, preferably, Figure 4 and Figure 5 As shown, the battery cell module 11 also includes a module bracket 3. An opening is formed at the top of the battery cell shell 111 along the height direction of the battery cell 114, and the module bracket 3 is arranged at the top opening of the battery cell shell 111; along the height direction of the battery cell 114, a pole ear is formed at the top of the battery cell 114, and the pole ear is inserted into the installation through hole of the module bracket 3.

[0058] According to the structure described above, the module bracket 3 plays a role in supporting the tabs of all the battery cells 114 , and can also play a role in covering the top of the battery cell housing 111 .

[0059] In this embodiment, preferably, Figure 4 and Figure 6 As shown, the cell module 11 further includes an inter-cell bracket 4, which is built into the cell 114 assembly to separate the cell 114 assembly into a first cell assembly 112 and a second cell assembly 113, and the first cell assembly 112 and the second cell assembly 113 each include a plurality of cells 114 sequentially arranged along a first preset direction;

[0060] Along the height direction of the battery cell 114 , the inter-cell bracket 4 is supported below the module bracket 3 ; along the width direction of the module bracket 3 , two sides of the inter-cell bracket 4 respectively abut against two opposite inner side walls of the battery cell housing 111 .

[0061] According to the structure described above, the inter-cell bracket 4 is built into the battery cell 114 assembly, and preferably, the inter-cell bracket 4 is placed between two rows of battery cells 114, which can support the battery cell housing 111 and the aforementioned module bracket 3, play a reinforcing role, and avoid crushing the battery cells 114.

[0062] In addition, the inter-cell bracket 4 and the cell housing 111 support the downward pressure during the welding of the cell tabs, providing strength support so that the welding positions of the cell tabs are at the same height during the downward pressure of laser welding, effectively ensuring the welding yield.

[0063] In this embodiment, preferably, Figure 6 As shown, the inter-cell bracket 4 is connected to the cell housing 111 by snapping, which is a detachable connection method for easy maintenance.

[0064] Of course, the connection method between the inter-cell bracket 4 and the cell housing 111 is not limited to this, and they can also be connected by bolts or other methods.

[0065] In this embodiment, preferably, Figures 7 to 10 As shown, along the height direction of the battery cell 114 , the inner wall of the bottom end of the battery cell housing 111 is provided with a protrusion 1113 protruding toward the battery cell 114 .

[0066] According to the structure described above, the battery cell 114 is seated on the protrusion 1113 , which can effectively prevent the bottom corner of the battery cell 114 from directly contacting the bottom of the battery cell housing 111 and damaging the surface insulation coating, causing poor insulation.

[0067] Further, preferably, the number of the protrusions 1113 is two, and they are arranged in sequence along the length direction of the battery cell shell 111. Of course, this is not limited to this. The number of the protrusions 1113 can also be one or more than two, such as three or four, etc., which is selected according to actual needs.

[0068] In this embodiment, preferably, Figure 2 and Figure 3 As shown, the battery module 1 further includes an end plate 12, an end foam 13 and a cover plate 14; wherein, the number of the battery cell modules 11 is multiple, and they are arranged in sequence along the second preset direction to form a battery cell module assembly;

[0069] There are two end plates 12, which are respectively arranged at both ends of the battery module assembly along the second preset direction, and an end foam 13 is arranged between any end plate 12 and the battery module assembly; along the height direction of the battery module assembly, the cover plate 14 is arranged at the top of the battery module assembly, and the liquid cooling plate 2 is arranged at the bottom of the battery module assembly; the cover plate 14 is spaced apart from the pole ear to form an installation space.

[0070] According to the structure described above, the end foam 13 can adjust its own hardness according to different preload designs, change the compression deformation, and compress the end foam 13 when assembling the extruded end plate 12. The pressure is mainly concentrated on the end foam 13, avoiding extrusion damage to the first battery cell shell 1111 and the second battery cell shell 1112, which is safer and more reliable.

[0071] It should be noted that the height direction of the battery cell 114 , the height direction of the battery cell 114 assembly, the height direction of the battery cell module 11 , the height direction of the battery cell module assembly and the height direction of the battery module 1 are all the same.

[0072] In this embodiment, preferably, Figure 2 and Figure 3 As shown, the battery module 1 further includes a pressing member 15 , which is pressed on the upper surface of the cover plate 14 away from the battery cell module assembly, and the pressing member 15 is detachably connected to the end plate 12 .

[0073] According to the structure described above, it can be known that the pressing member 15 plays a role in fixing the cover plate 14, so that the cover plate 14 is more stable.

[0074] Further, preferably, the pressing member 15 is in a strip shape and extends along the second preset direction, but is not limited thereto.

[0075] Further, preferably, the number of the pressing members 15 is two, and they are respectively arranged on both sides along the width direction of the battery module 1 , but of course, it is not limited thereto.

[0076] In this embodiment, preferably, Figure 2 and Figure 3 As shown, the battery module 1 further includes a binding strap 16 , and the binding strap 16 is bound to the outside of the battery cell module 11 and the two end plates 12 .

[0077] According to the structure described above, it can be known that the binding strap 16 plays a role in fixing the battery cell module 11 and the end plate 12, so that the battery module 1 as a whole is more solid and stable.

[0078] Further, preferably, the number of the straps 16 can be two, along the height direction of the battery module 1, one strap 16 is arranged close to the top of the battery module 1, and one strap 16 is arranged close to the bottom of the battery module 1, which has a good fixing effect. Of course, the number of the straps 16 is not limited to this, and can also be one or more than two, such as three, four, etc. It is designed according to actual needs.

[0079] In this embodiment, preferably, Figure 2 , Fig.13 and Fig.14 As shown, the battery module 1 also includes a bus 17 and a connecting copper bus 18; wherein the bus 17 is arranged in the installation space formed between the cover plate 14 and the pole ear of the battery cell 114; the second preset direction is the same as the first preset direction, so that all the first battery cell assemblies 112 of the battery module 1 are arranged in one row along the second preset direction, and all the second battery cell assemblies 113 of the battery module 1 are arranged in another row along the second preset direction, and the two adjacent battery cells 114 in each row are electrically connected through the bus 17; the connecting copper bus 18 is electrically connected to the first battery cell assembly 112 and the second battery cell assembly 113 respectively.

[0080] According to the structure described above, it can be known that for the entire battery module 1, two columns of spaced-apart battery cell structures are formed, and for each column of battery cell structures, two adjacent battery cells 114 can be connected by a bus 17, and finally the two columns of battery cell structures are connected together by a connecting copper bus 18, and according to different needs, the orientation of the positive and negative pole ears of adjacent battery cells 114 can be adjusted to achieve series connection or parallel connection, for example: the positive pole ear of one battery cell 114 of two adjacent battery cells 114 corresponds to the negative pole ear of the other battery cell 114, and the positive and negative pole ears can be connected by the aforementioned bus 17, thereby forming a series structure.

[0081] Furthermore, preferably, the battery module 1 further includes a busbar 19 , and the aforementioned plurality of busbars 17 are all integrated on the busbar 19 , and the busbar 19 is insulated.

[0082] It should be noted that: the second preset direction is not limited to being the same as the first preset direction, and the two can also be different, for example, forming an angle, which is specifically designed according to actual needs.

[0083] In this embodiment, preferably, Figure 3 and Fig.14 As shown, the battery module 1 further includes a fastening member 110 , and the end plate 12 is detachably connected to the liquid cooling plate 2 via the fastening member 110 .

[0084] According to the structure described above, the end plate 12 and the liquid cooling plate 2 are assembled together by using the fastening member 110 , which plays a role in fixing the battery module 1 .

[0085] Further, preferably, the fastening member 110 is a screw or a bolt, and preferably, the fastening member 110 extends along the height direction of the end plate 12 .

[0086] In this embodiment, preferably, Figures 4 to 6 As shown, the battery cell housing 111 includes a first battery cell housing 1111 and a second battery cell housing 1112 , and the first battery cell housing 1111 and the second battery cell housing 1112 are detachably connected.

[0087] According to the structure described above, it can be seen that the battery cell housing 111 is designed to be two detachable parts, so that the internal assembly of the two parts is convenient and the subsequent maintenance is convenient.

[0088] In this embodiment, preferably, Figure 4 and Figure 5 As shown, the first battery cell housing 1111 and the second battery cell housing 1112 are connected by snap-fitting, which is a commonly used connection method and is simple and convenient to operate.

[0089] In this embodiment, preferably, Figure 4 and Figure 5 As shown, the first battery cell shell 1111 has a box-like structure, and its top and one side are both open structures, the second battery cell shell 1112 is plate-shaped, and a flange 1114 is formed on its side, the plate-shaped second battery cell shell 1112 is installed at the side opening of the first battery cell shell 1111, and closes the side opening, and the flange 1114 of the second battery cell shell 1112 is arranged close to the side of the first battery cell shell 1111, together forming a structure with a hollow interior and an open top.

[0090] Further, preferably, a first buckle 1115 is provided on the side of the first battery cell shell 1111, a first clip hole 1116 is provided on the flange 1114 of the second battery cell shell 1112, and the first buckle 1115 is clamped in the first clip hole 1116. Of course, this is not limited to the above. The flange 1114 of the second battery cell shell 1112 may also be provided with a first buckle, and the side of the first battery cell shell 1111 may be provided with a first clip hole. The specific design is based on actual needs.

[0091] Further, preferably, the bottom wall of the first battery cell housing 1111 is formed with the aforementioned protrusion 1113 ; the first battery cell housing 1111 is a rectangular box-shaped structure.

[0092] Of course, the structures of the first cell housing 1111 and the second cell housing 1112 are not limited to the above, and can also be designed according to actual needs.

[0093] In this embodiment, preferably, Figure 4 As shown, the battery cell 114 assembly further includes a middle foam 115 , and a middle foam 115 is disposed between any two adjacent battery cells 114 .

[0094] According to the structure described above, the foam between the battery cells 114 can absorb the expansion of the battery cells 114 during the cycle process.

[0095] In this embodiment, preferably, the inner wall of the battery cell housing 111 is provided with an insulating coating to play a role of insulating protection.

[0096] In this embodiment, preferably, Figure 1 , Fig.11 and Fig.12 As shown, the battery pack also includes a cover shell 5 and an auxiliary mounting beam 6; wherein, there are multiple auxiliary mounting beams 6, and all are fixed to the liquid cooling plate 2; multiple auxiliary mounting beams 6 and the liquid cooling plate 2 are arranged to form a groove 8, and the battery module 1 is arranged in the groove 8; the cover shell 5 is buckled on the outside of the battery module 1, and is against and connected to the auxiliary mounting beam 6.

[0097] According to the structure described above, the auxiliary mounting beam 6 is assembled with the liquid cooling plate 2 to form the base of the battery pack, and the battery module 1 can be installed in the groove 8 of the base, which plays a role in limiting the X and Y directions of the battery module 1 in the horizontal plane, making the battery module 1 more solid and stable, without displacement, and more safe and reliable.

[0098] In addition, a cover shell 5 is provided to cover the battery module 1 and protect the battery module 1 .

[0099] Further, preferably, Fig.12As shown, the battery pack also includes a reinforcing beam 7, and the reinforcing beam 7 is arranged at the bottom of the liquid cooling plate 2, so as to reinforce the liquid cooling plate 2, that is, to increase the strength of the battery pack base, and preferably, the liquid cooling plate 2 is formed with reinforcing protrusions 1113 along both sides perpendicular to the second preset direction, and the reinforcing beam 7 is arranged between the reinforcing protrusions 1113 and connected to the two reinforcing protrusions 1113.

[0100] In this embodiment, preferably, the battery cell housing 111 and the liquid cooling plate 2 are made of aluminum alloy, which has good thermal conductivity, good strength, and light weight. Of course, the materials of the battery cell housing 111 and the liquid cooling plate 2 are not limited to this, and other materials such as steel can also be used.

[0101] In this embodiment, preferably, Figure 1 , Fig.11 and Fig.12 As shown, the number of battery modules 1 is two, and they are arranged sequentially along the third preset direction. Of course, this is not limited to this, and the number of battery modules 1 can also be one or more than two, such as three or four, etc.

[0102] Preferably, the third preset direction is perpendicular to the second preset direction, but this is not limited thereto.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack, characterized in that: include: A battery module and a liquid cooling plate; wherein the battery module comprises a cell module, the cell module comprises a cell shell and a cell assembly disposed in the cell shell, and a thermal conductive adhesive is filled between the cell assembly and the cell shell; The battery core assembly includes a plurality of the battery cores, and thermal conductive adhesive is filled between any two adjacent battery cores; the battery core housing is in contact with the liquid cooling plate, and thermal conductive adhesive is filled between them.

2. The battery pack according to claim 1, characterized in that: The battery cell module also includes a module bracket. An opening is formed at the top of the battery cell shell along the height direction of the battery cell, and the module bracket is arranged at the top opening of the battery cell shell; a pole ear is formed at the top of the battery cell along the height direction of the battery cell, and the pole ear is inserted into the installation through hole of the module bracket.

3. The battery pack according to claim 2, characterized in that: The cell module further includes an inter-cell bracket, which is built into the cell assembly to separate the cell assembly into a first cell assembly and a second cell assembly, and the first cell assembly and the second cell assembly each include a plurality of cells sequentially arranged along a first preset direction; Along the height direction of the battery cell, the inter-cell bracket is supported below the module bracket; along the width direction of the module bracket, two sides of the inter-cell bracket respectively abut against two opposite inner side walls of the battery cell housing.

4. The battery pack according to claim 3, characterized in that: The inter-cell bracket is detachably connected to the cell shell.

5. The battery pack according to claim 2, characterized in that: Along the height direction of the battery cell, an inner wall of the bottom end of the battery cell housing is provided with a protrusion protruding toward the battery cell side.

6. The battery pack according to claim 3, characterized in that: The battery module further includes an end plate, an end foam and a cover plate; wherein the number of the battery cell modules is multiple and they are arranged in sequence along the second preset direction to form a battery cell module assembly; There are two end plates, which are respectively arranged at the two ends of the battery module assembly along the second preset direction, and the end foam is arranged between any end plate and the battery module assembly; along the height direction of the battery module assembly, the cover plate is arranged at the top end of the battery module assembly, and the liquid cooling plate is arranged at the bottom end of the battery module assembly; the cover plate and the pole ear are spaced apart to form an installation space.

7. The battery pack according to claim 6, characterized in that: The battery module further comprises a pressing member, the pressing member is pressed on an upper surface of the cover plate away from the battery module assembly, and the pressing member is detachably connected to the end plate; and / or The battery module further comprises a binding strap, and the binding strap is bound to the battery cell module and the outside of the two end plates; and / or The battery module further includes a bus bar and a connecting copper bus bar; wherein the bus bar is arranged in the installation space formed between the cover plate and the tabs of the battery cell; the second preset direction is the same as the first preset direction, so that all the first battery cell assemblies of the battery module are arranged in one row along the second preset direction, and all the second battery cell assemblies of the battery module are arranged in another row along the second preset direction, and two adjacent battery cells in each row are electrically connected through the bus bar; the connecting copper bus bar is electrically connected to the first battery cell assembly and the second battery cell assembly respectively; and / or The battery module further includes a fastening member, and the end plate is detachably connected to the liquid cooling plate via the fastening member.

8. The battery pack according to claim 1, characterized in that: The battery cell shell includes a first battery cell shell and a second battery cell shell, and the first battery cell shell is detachably connected to the second battery cell shell.

9. The battery pack according to claim 8, characterized in that: The first battery cell shell is connected to the second battery cell shell by snapping.

10. The battery pack according to claim 1, characterized in that: The battery pack further comprises a cover shell, an auxiliary mounting beam and a reinforcement beam; wherein the number of the auxiliary mounting beams is multiple and all are fixed to the liquid cooling plate; the multiple auxiliary mounting beams and the liquid cooling plate are arranged to form a groove, and the battery module is arranged in the groove; the cover shell is buckled on the outside of the battery module and abuts against and is connected to the auxiliary mounting beam; the reinforcement beam is arranged at the bottom of the liquid cooling plate; and / or The battery core assembly further includes an intermediate foam, and the intermediate foam is arranged between any two adjacent battery cores; and / or The inner wall of the battery cell shell is provided with an insulating coating.

11. The battery pack according to any one of claims 1 to 10, characterized in that: The battery cell housing and the liquid cooling plate are both made of metal.

12. The battery pack according to claim 11, characterized in that: The battery cell housing and the liquid cooling plate are both made of aluminum alloy.

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