Battery pack

Abstract

The utility model belongs to the technical field of energy storage products, and discloses a battery pack which comprises at least two layers of battery cell modules, a liquid cooling assembly is arranged between every two adjacent layers of battery cell modules, the two adjacent layers of battery cell modules are cooled through the liquid cooling assemblies at the same time, a support used for supporting the battery cell modules does not need to be arranged, and the size of the battery pack in the thickness direction can be reduced. The liquid cooling assembly comprises a first plate, a second plate and a third plate, the second plate is located between the first plate and the third plate, a first cooling flow channel is formed between the first plate and the second plate, and a second cooling flow channel is formed between the second plate and the third plate; the first cooling flow channel and the second cooling flow channel are used for introducing cooling liquid, and cooling and heat dissipation are respectively and specifically performed on the two adjacent layers of battery cell modules, so that compared with a mode of simultaneously cooling the two adjacent layers of battery cell modules through one cooling flow channel, the cooling effect of the multiple layers of battery cell modules can be effectively improved, and the service life of the multiple layers of battery cell modules is prolonged. Dangers of thermal runaway and the like caused by slow cooling of the battery cell module are prevented, and the service life of the battery pack is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage products, in particular to a battery pack. Background Art

[0002] In order to increase the capacity of the battery pack, multiple battery modules are usually arranged in the battery pack, and the multiple battery modules can be arranged in layers to reasonably utilize the internal space of the battery pack. For multi-layer battery modules, brackets are usually used to separate the modules, and a cold plate is set at the bottom for each layer of battery modules. However, this arrangement will increase the size of the battery pack in the thickness direction, and the battery pack space utilization rate is low.

[0003] Patent CN114335795A discloses an integrated battery assembly with double-layer modules, in which multiple battery cell modules are distributed in two layers, and a water cooling plate assembly is arranged between the two layers of battery cell modules. The water cooling plate assembly is used to cool the upper and lower layers of battery cell modules, which can reduce the thickness of the battery pack and improve the space utilization of the battery pack.

[0004] However, the above scheme has the following defects: a flow channel inside the water-cooling plate assembly cools down the upper and lower layers of battery cell modules at the same time, and the cooling effect is poor. After the battery cell modules have been running for a long time, they are likely to cause thermal runaway due to slow cooling, thereby shortening the service life of the battery pack.

[0005] Therefore, a new battery pack is urgently needed to solve the above problems existing in the prior art. Utility Model Content

[0006] The purpose of the utility model is to provide a battery pack, which can improve the cooling effect of the multi-layer battery module while reducing the thickness dimension of the battery pack and improving the space utilization of the battery pack, thereby preventing the battery module from thermal runaway due to slow cooling and other dangers, and extending the service life of the battery pack.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A battery pack is provided, comprising:

[0009] At least two layers of battery cell modules;

[0010] A liquid cooling assembly is provided between two adjacent layers of the battery core modules, the liquid cooling assembly comprises a first plate, a second plate and a third plate, the second plate is located between the first plate and the third plate, a first cooling channel is formed between the first plate and the second plate, and a second cooling channel is formed between the second plate and the third plate;

[0011] The first cooling channel and the second cooling channel are connected or not connected.

[0012] As a preferred solution of the battery pack provided by the utility model, a side surface of the first plate facing away from the second plate is a plane;

[0013] And / or, a side surface of the third plate facing away from the second plate is a plane.

[0014] As a preferred solution of the battery pack provided by the utility model, the first plate and the third plate are both flat plates, the first flow channel groove and the second flow channel groove are respectively provided on both sides of the second plate, the inner wall of the first flow channel groove and the first plate are arranged to form the first cooling flow channel, and the second cooling flow channel is arranged between the second flow channel groove and the third plate.

[0015] As a preferred solution of the battery pack provided by the utility model, a first convex bump and a second convex bump are respectively provided on both sides of the second plate, the first convex bump and the second flow channel groove are provided on the same side of the second plate, and the second convex bump and the first flow channel groove are provided on the same side of the second plate;

[0016] The first convex hump is arranged on a side facing away from the second flow channel to form the first flow channel, and the second convex hump is arranged on a side facing away from the first flow channel to form the second flow channel.

[0017] As a preferred solution of the battery pack provided by the utility model, a third flow channel is provided on a side of the first plate facing the second plate, and the first cooling flow channel is formed between the inner wall of the third flow channel and the second plate;

[0018] And / or, a fourth flow channel is provided on a side of the third plate facing the second plate, and the second cooling flow channel is formed between an inner wall of the fourth flow channel and the second plate.

[0019] As a preferred solution of the battery pack provided by the utility model, a first thermally conductive structural adhesive is provided between the first plate and the battery cell module; and / or a second thermally conductive structural adhesive is provided between the second plate and the battery cell module.

[0020] As a preferred solution of the battery pack provided by the utility model, the battery cell module is provided with two layers, and the two layers of the battery cell modules are arranged in mirror symmetry with respect to the liquid cooling assembly. The battery cell module includes a plurality of battery cells, and the battery cell includes a shell and a pole, and the pole is located on the side of the shell facing away from the liquid cooling assembly.

[0021] As a preferred solution of the battery pack provided by the utility model, the battery pack further comprises a shell frame assembly, and the shell frame assembly comprises a main shell and a partition beam;

[0022] The main shell has a cavity, the liquid cooling component is connected to the inner wall of the main shell, and the liquid cooling component divides the cavity into two accommodating chambers, each of which has a layer of the battery cell module placed in it; each of the accommodating chambers is provided with one or more partition beams, the partition beams divide the accommodating chamber into a plurality of module chambers, a single layer of the battery cell module includes a plurality of the battery cell modules, and the plurality of the battery cell modules are placed in the plurality of module chambers in a one-to-one correspondence.

[0023] As a preferred solution of the battery pack provided by the utility model, the shell frame assembly further includes two cover bodies, and the two cover bodies are respectively detachably buckled on the cavity openings of the two accommodating chambers;

[0024] The battery pack also includes a pressure strip, both ends of which are connected to the main shell, and the pressure strip is pressed against the side of the shell facing away from the bottom wall of the module chamber, the pressure strip is higher than the pole, and the cover is pressed against the pressure strip.

[0025] As a preferred solution of the battery pack provided by the utility model, a first adhesive layer is sandwiched between the pressure strip and the shell; and / or a second adhesive layer is sandwiched between the pressure strip and the cover body.

[0026] Beneficial effects of the utility model:

[0027] The utility model provides a battery pack, including at least two layers of battery cell modules, wherein a liquid cooling component is provided between two adjacent layers of battery cell modules, and the liquid cooling component is used to dissipate heat and cool down the two adjacent layers of battery cell modules at the same time, and there is no need to provide a bracket for supporting the battery cell modules between the adjacent modules, which can reduce the thickness dimension of the battery pack and improve the space utilization of the battery pack. A first cooling channel is defined between the first plate and the second plate of the liquid cooling component, and a second cooling channel is defined between the second plate and the third plate. The first cooling channel and the second cooling channel are used to pass coolant, respectively, to dissipate heat and cool down the two adjacent layers of battery cell modules in a targeted manner. Compared with the method of cooling down the two adjacent layers of battery cell modules at the same time through one cooling channel, the cooling effect of the multi-layer battery cell modules can be effectively improved, and the battery cell modules can be prevented from being exposed to dangers such as thermal runaway due to slow cooling, thereby extending the service life of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a first exploded view of a battery pack provided by a specific embodiment of the utility model;

[0029] Figure 2 is a second exploded view of a battery pack provided in a specific embodiment of the utility model;

[0030] Figure 3 is a cross-sectional view of a liquid cooling assembly provided in a specific embodiment of the utility model;

[0031] Figure 4 yes Figure 3 A partial view of

[0032] Figure 5 It is a first exploded view of the liquid cooling assembly provided by the specific embodiment of the utility model;

[0033] Figure 6 is a second exploded view of the liquid cooling assembly provided in the specific embodiment of the utility model;

[0034] Figure 7 is a first view of a second plate of a liquid cooling assembly provided in a specific embodiment of the utility model;

[0035] Figure 8 is a second view of the second plate of the liquid cooling assembly provided in a specific embodiment of the utility model;

[0036] Fig. 9 This is a first exploded view of the main housing and the battery module provided by the specific embodiment of the utility model;

[0037] Fig.10 This is a second exploded view of the main housing and the battery module provided by the specific embodiment of the utility model;

[0038] Fig.11 yes Figure 2 A partial enlarged view of point A in the middle.

[0039] In the figure:

[0040] 1. Battery module; 2. Liquid cooling assembly; 3. First thermal conductive structural adhesive; 4. Second thermal conductive structural adhesive; 5. Frame assembly; 6. Layering strip; 7. First adhesive layer; 8. Second adhesive layer;

[0041] 11. battery cell; 111. housing; 112. pole;

[0042] 21. first plate; 22. second plate; 23. third plate; 24. first cooling channel; 25. second cooling channel;

[0043] 221, first flow channel groove; 222, second flow channel groove; 223, first convex hull; 224, second convex hull;

[0044] 51. Main shell; 52. Partition beam; 53. Cover;

[0045] 510, module chamber;

[0046] 61. Material reduction cavity. DETAILED DESCRIPTION

[0047] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0048] 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.

[0049] In the present utility model, 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.

[0050] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0051] This embodiment provides a battery pack, such as Figure 1 and Figure 2 The figure shows an exploded view of the battery pack. While reducing the thickness of the battery pack and improving the space utilization of the battery pack, the battery pack can also improve the cooling effect of the multi-layer battery module 1, prevent the battery module 1 from thermal runaway and other dangers due to slow cooling, and extend the service life of the battery pack.

[0052] The battery pack includes at least two layers of battery cell modules 1, such as two layers, three layers, four layers or more layers of battery cell modules 1. Each layer of battery cell modules 1 includes one or more battery cell modules 1. Figure 1and Figure 2 In the embodiment, each layer of cell modules 1 includes four cell modules 1 in a 2×2 matrix distribution, and each cell module 1 includes a plurality of cells 11. In other embodiments, the distribution of each layer of cell modules 1 can be selected according to design requirements, and is not limited to the above-mentioned 2×2 matrix distribution, such as 2×3 or 3×3 matrix distribution.

[0053] A liquid cooling assembly 2 is provided between each two adjacent layers of battery modules 1. The liquid cooling assembly 2 dissipates heat and cools the two adjacent layers of battery modules 1 at the same time, and there is no need to provide a bracket for supporting the battery modules 1 between adjacent modules, which can reduce the thickness dimension of the battery pack and improve the space utilization of the battery pack.

[0054] See also Figure 3 , Figure 4 as well as Figure 5 The liquid cooling assembly 2 includes a first plate 21, a second plate 22, and a third plate 23 stacked in sequence, the second plate 22 is located between the first plate 21 and the third plate 23, and the first plate 21, the second plate 22, and the third plate 23 are connected as a whole. A first cooling channel 24 is formed between the first plate 21 and the second plate 22, and a second cooling channel 25 is formed between the second plate 22 and the third plate 23. The first cooling channel 24 and the second cooling channel 25 are used to pass a continuously circulating coolant to achieve cooling.

[0055] In the liquid cooling assembly 2 between the two layers of battery cell modules 1, a first cooling channel 24 is defined between the first plate 21 and the second plate 22, and a second cooling channel 25 is defined between the second plate 22 and the third plate 23. The first cooling channel 24 and the second cooling channel 25 respectively and specifically cool down and dissipate heat for the two adjacent layers of battery cell modules 1. Compared with the method of cooling down the two adjacent layers of battery cell modules 1 at the same time through one cooling channel, the cooling effect of the multi-layer battery cell module 1 can be effectively improved, so that the battery cells 11 in the battery cell module 1 can work in a suitable temperature environment, and the battery cell module 1 can be prevented from having thermal runaway and other dangers due to slow cooling, thereby extending the service life of the battery pack.

[0056] Exemplarily, the first plate 21 and the second plate 22 , as well as the second plate 22 and the third plate 23 are all connected by welding, which can improve the connection stability and sealing performance.

[0057] In some embodiments, the first cooling channel 24 and the second cooling channel 25 are connected, and the coolant inlet is fixedly arranged on the first plate 21 to be directly connected to the first cooling channel 24, or the coolant inlet is fixedly arranged on the third plate 23 to be directly connected to the second cooling channel 25. A connecting port is arranged between the first cooling channel 24 and the second cooling channel 25, and the connecting port is arranged on the second plate 22. The coolant input through the inlet can flow through the first cooling channel 24 and the second cooling channel 25, and can save the number of components, reduce the occupied space, and reduce the cost while realizing the cooling of the adjacent two layers of battery core modules 1.

[0058] In some other embodiments, the first cooling channel 24 and the second cooling channel 25 may not be connected. In this case, a liquid inlet for introducing the coolant and a liquid outlet for leading out the coolant need to be separately provided on the first plate 21 and the third plate 23, and the first cooling channel 24 and the second cooling channel 25 are independent of each other, and the internal coolants are not connected.

[0059] Optionally, the side of the first plate 21 facing away from the second plate 22 is a plane, which is used to contact one layer of battery cell modules 1; the side of the third plate 23 facing away from the second plate 22 is also a plane, which is used to contact another layer of battery cell modules 1. Setting the side of the liquid cooling component 2 in contact with the battery cell module 1 as a plane can improve the relative stability between the battery cell module 1 and the liquid cooling component 2 inside the battery pack, and at the same time, ensure that there is sufficient contact area between the liquid cooling component 2 and the battery cell module 1, thereby improving the heat dissipation effect.

[0060] Specifically in this embodiment Figure 5 and Figure 6 The first plate 21 and the third plate 23 are both flat plates. Figure 7 and Figure 8 , the first flow channel groove 221 and the second flow channel groove 222 are respectively provided on both sides of the second plate 22. The inner wall of the first flow channel groove 221 and the first plate 21 are surrounded to form a first cooling channel 24, and the second flow channel groove 222 and the third plate 23 are surrounded to form a second cooling channel 25. Since the first plate 21 and the third plate 23 are both flat plates, both side surfaces thereof are planes, which are easy to contact with the battery cell module 1. Moreover, in the liquid cooling assembly 2, only the first flow channel groove 221 and the second flow channel groove 222 need to be respectively provided on one second plate 22, and the remaining two plates (the first plate 21 and the third plate 23) are both set to planes, so as to define the first cooling channel 24 and the second cooling channel 25, simplify the processing steps, and improve the processing efficiency.

[0061] See also Figure 7 and Figure 8, the first convex hump 223 and the second convex hump 224 are respectively convexly provided on both sides of the second plate 22, the first convex hump 223 and the second flow channel groove 222 are provided on the same side of the second plate 22, and the second convex hump 224 and the first flow channel groove 221 are provided on the same side of the second plate 22. The first convex hump 223 is provided on the side facing away from the second flow channel groove 222 to form the above-mentioned first flow channel groove 221, and the second convex hump 224 is provided on the side facing away from the first flow channel groove 221 to form the above-mentioned second flow channel groove 222. That is, while the first convex hump 223 is convexly provided on the second plate 22 to form, a groove is formed on the back side of the first convex hump 223, and the groove is the first flow channel groove 221. While the second convex hump 224 is convexly provided on the second plate 22 to form, a groove is formed on the back side of the second convex hump 224, and the groove is the second flow channel groove 222. Specifically, the second plate 22 in the present embodiment is integrally stamped and formed, and the stamping die is adapted to the shapes and sizes of the first flow groove 221 and the second flow groove 222. The first flow groove 221, the second flow groove 222, the first convex bump 223 and the second convex bump 224 can be stamped and formed at one time, and the process is simple.

[0062] It can be understood that the first convex hump 223 and the first flow channel groove 221 have the same shape, and the second convex hump 224 and the second flow channel groove 222 have the same shape. When the second convex hump 224 is formed, the second flow channel groove 222 can be formed on its back, and when the first convex hump 223 is formed, the first flow channel groove 221 can be formed on its back.

[0063] In this embodiment, at least one of the first cooling channel 24 and the second cooling channel 25 is a serpentine channel, which can increase the flow time of the coolant therein, so that the coolant is in full contact with the battery module 1, thereby improving the cooling effect.

[0064] Specific to Figure 7 and Figure 8 The first flow channel groove 221 extends in a serpentine shape, and accordingly, the first convex hump 223 also extends in a serpentine shape. The second convex hump 224 is disposed outside the first flow channel groove 221 , and the second flow channel groove 222 is disposed outside the first convex hump 223 .

[0065] Combination Figure 4 , Figure 5 as well as Figure 6 The first convex hump 223 is in sealing contact with the third plate 23 , and the second convex hump 224 is in sealing contact with the first plate 21 , so that the coolant in the first cooling channel 24 and the second cooling channel 25 flows in a defined path.

[0066] In another optional embodiment, flow channels may be provided on the first plate 21 and the third plate 23. Specifically, the side of the first plate 21 facing the battery module 1 is a plane, and the side of the first plate 21 facing the second plate 22 is provided with a third flow channel groove, and the inner wall of the third flow channel groove and the second plate 22 are surrounded to form a first cooling flow channel 24. The side of the third plate 23 facing the battery module 1 is a plane, and the side of the third plate 23 facing the second plate 22 is provided with a fourth flow channel groove, and the inner wall of the fourth flow channel groove and the second plate 22 are surrounded to form a second cooling flow channel 25. Further, the second plate 22 may be a flat plate at this time, and the two side surfaces of the flat plate define the first cooling flow channel 24 and the second cooling flow channel 25 with the first plate 21 and the third plate 23, respectively. Alternatively, the second plate 22 may be a flow channel plate, with a fifth flow channel groove and a sixth flow channel groove respectively provided on both sides thereof, the inner wall of the third flow channel groove on the first plate 21 and the inner wall of the fifth flow channel groove on the second plate 22 jointly enclose a first cooling flow channel 24, and the fourth flow channel groove on the third plate 23 and the sixth flow channel groove on the second plate 22 jointly enclose a second cooling flow channel 25.

[0067] See also Fig. 9 and Fig.10 The battery cell 11 includes a shell 111 and a pole 112, and the pole 112 is arranged on the shell 111. In this embodiment, the battery cell module 1 is provided with two layers, and the two layers of the battery cell module 1 are arranged mirror-symmetrically with respect to the liquid cooling component 2, and the pole 112 is located on the side of the shell 111 facing away from the liquid cooling component 2. Therefore, the side of the shell 111 where the pole 112 is not arranged is directly in plane contact with the liquid cooling component 2, which increases the contact area, has a better heat dissipation effect, and is conducive to maintaining the temperature consistency of multiple battery cells 11.

[0068] Exemplarily, two layers of battery cell modules 1 are distributed up and down, with the upper battery cell module 1 arranged with the pole 112 facing upward, and the lower battery cell module 1 arranged with the pole 112 facing downward, so that the outer shell 111 of the battery cell 11 in the upper battery cell module 1 is in plane contact with the first plate 21, and the outer shell 111 of the battery cell 11 in the lower battery cell module 1 is in plane contact with the third plate 23.

[0069] Optionally, a first thermally conductive structural adhesive 3 is provided between the first plate 21 and the upper battery module 1, specifically, the first plate 21 and the outer shell 111 of the upper battery 11 are bonded and fixed by the first thermally conductive structural adhesive 3. A second thermally conductive structural adhesive 4 is provided between the second plate 22 and the battery module 1, specifically, the third plate 23 and the outer shell 111 of the lower battery 11 are bonded by the second thermally conductive structural adhesive 4. On the one hand, the first thermally conductive structural adhesive 3 and the second thermally conductive structural adhesive 4 can quickly fix the liquid cooling component 2 and the upper and lower battery modules 1, and the fixing firmness is high; on the other hand, the first thermally conductive structural adhesive 3 and the second thermally conductive structural adhesive 4 have good thermal conductivity, which can improve the heat exchange efficiency between the liquid cooling component 2 and the upper and lower battery modules 1, and improve the cooling effect.

[0070] Exemplarily, the first thermally conductive structural adhesive 3 and the second thermally conductive structural adhesive 4 are both two-component polyurethane thermally conductive structural adhesives, which have high strength, high bonding firmness, and excellent thermal conductivity.

[0071] See also Figure 1 , Figure 2 , Fig. 9 as well as Fig.10 The battery pack also includes a frame assembly 5, and the frame assembly 5 includes a main shell 51 and a partition beam 52. The main shell 51 has a cavity, and the liquid cooling assembly 2 is connected to the inner wall of the main shell 51. Specifically, the liquid cooling assembly 2 can be fixedly connected to the main shell 51 by welding, riveting or bolting. The liquid cooling assembly 2 divides the cavity into two upper and lower accommodating chambers, and a layer of battery cell module 1 is placed in each accommodating chamber. That is, the upper and lower layers of battery cell modules 1 are correspondingly placed in the upper and lower accommodating chambers. Furthermore, one or more partition beams 52 are provided in each accommodating chamber, and the partition beams 52 divide the accommodating chamber into a plurality of module chambers 510. The single-layer battery cell module 1 includes a plurality of battery cell modules 1, and the plurality of battery cell modules 1 are placed in a plurality of module chambers 510 one by one. The separation beam 52 can separate the battery modules 1 to prevent short circuits between the two battery modules 1, and can play a good isolation role when one of the battery modules 1 is thermally runaway to prevent the spread to other battery modules 1. In addition, the separation beam 52 can limit the position of the battery module 1 to ensure the stability and safety of the battery 11 in the battery pack.

[0072] In this embodiment, the partition beam 52 is an expansion beam in the battery field, and the expansion beam is fixed to the main housing 51 by welding, riveting or bolting.

[0073] For example, see Fig. 9 and Fig.10Four partition beams 52 are arranged in the receiving chamber, and the four partition beams 52 are arranged in a W shape to separate the four module chambers 510. Each layer of the battery module 1 includes four battery modules 1, and the four battery modules 1 are placed in the four module chambers 510 one by one.

[0074] Correspondingly, four first thermally conductive structural adhesives 3 are arranged on the upper layer, and each battery cell module 1 on the upper layer is bonded to the corresponding module cavity 510 through a first thermally conductive structural adhesive 3; four second thermally conductive structural adhesives 4 are arranged on the lower layer, and each battery cell module 1 on the lower layer is bonded to the corresponding module cavity 510 through a second thermally conductive structural adhesive 4.

[0075] See also Figure 1 and Figure 2 The housing assembly 5 further includes two covers 53, which are detachably buckled on the openings of the two accommodating chambers. When the two layers of battery modules are arranged up and down, the two covers 53 are respectively an upper cover and a bottom plate.

[0076] Continue to see Figure 1 and Figure 2 The battery pack also includes a pressure strip 6, which can press and fix the battery cell 11 in the module chamber 510. Specifically, the two ends of the pressure strip 6 are connected to the main shell 51, and the pressure strip 6 is pressed against the side of the outer shell 111 of the battery cell 11 that faces away from the bottom wall of the module chamber 510. After the battery cell module 1 is placed inside the module chamber 510, the two ends of the pressure strip 6 are connected to the main shell 51, so that the battery cell module 1 is pressed against the module chamber 510 to prevent the battery cell module 1 from moving in the main shell. The pressure strip 6 is higher than the pole 112 set on the outer shell 111. After the cover body 53 is buckled onto the main shell 51, it is pressed against the pressure strip 6 without pressing on the pole 112, which can improve the stability of the pressure strip 6, and further improve the stability and safety of the battery cell 11 in the battery pack.

[0077] In some embodiments, the two ends of the pressure strip 6 are connected to the main shell 51 by welding, riveting, or threaded connection, etc., as long as a stable connection between the pressure strip 6 and the main shell 51 can be achieved.

[0078] In some embodiments, both ends of the pressure strip 6 may be connected to a partition beam 52 disposed in the main shell 51 , or both ends of the pressure strip 6 may also be connected to an inner wall of the main shell 51 .

[0079] See also Fig.11 Both ends of the outer shell of the battery cell 11 are pressed and fixed by the pressure strip 6, so that the battery cell 11 is subjected to balanced force, ensuring the stability and safety of the battery cell 11 in the battery pack.

[0080] In some embodiments, the cover body 53 and the main shell 51 can be threadedly connected using fasteners such as screws or bolts to ensure that the cover body 53 and the main shell 51 are firmly connected and not loose. In addition, when a fault occurs inside the battery pack, it is convenient to remove the cover body 53 for inspection.

[0081] Further, see Fig.11 The pressure strip 6 is provided with a material reduction cavity 61, which can reduce the material consumption and reduce the cost while ensuring the strength and rigidity.

[0082] Exemplarily, each battery cell module 1 includes two rows of battery cells 11, see Fig.11 Three pressure strips 6 are provided corresponding to the two columns of battery cells 11, including two side pressure strips and one middle pressure strip. The shoulders of the two columns of battery cells 11 away from each other are provided with a side pressure strip respectively, and the middle pressure strip is pressed against the shoulders of the two columns of battery cells 11 close to each other. The side pressure strip is provided with a material reduction cavity 61, and the width of the middle pressure strip is greater than that of the side pressure strip, and two material reduction cavities 61 are provided therein, and the two material reduction cavities 61 are separated by a spacer.

[0083] Optionally, a first adhesive layer 7 is sandwiched between the bead 6 and the shell 111, and a second adhesive layer 8 is sandwiched between the bead 6 and the cover 53. The first adhesive layer 7 and the second adhesive layer 8 are used to achieve adhesion between the bead 6 and the cover 53 and the shell 111 of the battery cell 11, which has a high assembly efficiency and can improve the production speed of the battery pack.

[0084] The first adhesive layer 7 and the second adhesive layer 8 are exemplarily polyurethane structural adhesives.

[0085] For example, the pressure strip 6 can be made of an insulating material, such as plastic, etc., which has a good insulating effect. Alternatively, the pressure strip 6 can include a metal strip and an insulating film disposed on both sides of the metal strip, which can play an insulating role while having a high strength.

[0086] In this embodiment, the cover 53, the pressure strip 6, the battery module 1, and the liquid cooling assembly 2 are sequentially bonded and linked to form a battery pack as a whole, with high assembly efficiency and high rigidity of the whole pack. Moreover, since the bracket for supporting the battery module 1 is eliminated, the upper and lower layers of the battery module 1 are cooled by a liquid cooling assembly 2 at the same time, which simplifies the whole pack structure, improves the space utilization of the whole pack, and can increase the power of the whole pack and improve the driving range.

[0087] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A battery pack, characterized in that: include: At least two layers of battery cell modules (1); A liquid cooling component (2), wherein the liquid cooling component (2) is disposed between two adjacent layers of the battery core modules (1), the liquid cooling component (2) comprising a first plate (21), a second plate (22) and a third plate (23), the second plate (22) being located between the first plate (21) and the third plate (23), a first cooling channel (24) being formed between the first plate (21) and the second plate (22), and a second cooling channel (25) being formed between the second plate (22) and the third plate (23); The first cooling channel (24) and the second cooling channel (25) are connected or not connected.

2. The battery pack according to claim 1, characterized in that: A side surface of the first plate (21) facing away from the second plate (22) is a plane; And / or, a side surface of the third plate (23) facing away from the second plate (22) is a plane.

3. The battery pack according to claim 2, characterized in that: The first plate (21) and the third plate (23) are both flat plates, and a first flow channel groove (221) and a second flow channel groove (222) are respectively provided on both sides of the second plate (22), the inner wall of the first flow channel groove (221) and the first plate (21) are arranged to form the first cooling flow channel (24), and the second flow channel groove (222) and the third plate (23) are arranged to form the second cooling flow channel (25).

4. The battery pack according to claim 3, characterized in that: A first convex bump (223) and a second convex bump (224) are respectively provided on both sides of the second plate (22); the first convex bump (223) and the second flow channel groove (222) are provided on the same side of the second plate (22); and the second convex bump (224) and the first flow channel groove (221) are provided on the same side of the second plate (22); The first convex hump (223) is arranged on a side facing away from the second flow channel (222) to form the first flow channel (221), and the second convex hump (224) is arranged on a side facing away from the first flow channel (221) to form the second flow channel (222).

5. The battery pack according to claim 2, characterized in that: A third flow channel groove is provided on one side of the first plate (21) facing the second plate (22), and the first cooling flow channel (24) is formed between the inner wall of the third flow channel groove and the second plate (22); And / or, a fourth flow channel is provided on a side of the third plate (23) facing the second plate (22), and the second cooling flow channel (25) is formed between an inner wall of the fourth flow channel and the second plate (22).

6. The battery pack according to claim 1, characterized in that: A first thermally conductive structural adhesive (3) is provided between the first plate (21) and the battery core module (1); and / or a second thermally conductive structural adhesive (4) is provided between the second plate (22) and the battery core module (1).

7. The battery pack according to any one of claims 1 to 6, characterized in that: The battery cell module (1) is provided with two layers, and the two layers of the battery cell modules (1) are arranged in a mirror-symmetrical manner relative to the liquid cooling component (2); the battery cell module (1) comprises a plurality of battery cells (11); the battery cells (11) comprise a shell (111) and a pole (112); the pole (112) is located on a side of the shell (111) facing away from the liquid cooling component (2).

8. The battery pack according to claim 7, characterized in that: The battery pack further comprises a housing frame assembly (5), wherein the housing frame assembly (5) comprises a main housing (51) and a partition beam (52); The main housing (51) has a cavity, the liquid cooling component (2) is connected to the inner wall of the main housing (51), and the liquid cooling component (2) divides the cavity into two accommodating chambers, and a layer of the battery cell module (1) is placed in each of the accommodating chambers; One or more partition beams (52) are provided in each of the accommodating chambers, and the partition beams (52) divide the accommodating chamber into a plurality of module chambers (510). The single-layer battery cell module (1) includes a plurality of battery cell modules (1), and the plurality of battery cell modules (1) are placed in a one-to-one correspondence in the plurality of module chambers (510).

9. The battery pack according to claim 8, characterized in that: The housing assembly (5) further comprises two cover bodies (53), wherein the two cover bodies (53) are respectively and detachably buckled on the cavity openings of the two accommodating chambers; The battery pack further comprises a pressure strip (6), both ends of which are connected to the main shell (51), and the pressure strip (6) is pressed against a side of the shell (111) facing away from the bottom wall of the module chamber (510), the pressure strip (6) is higher than the pole (112), and the cover (53) is pressed against the pressure strip (6).

10. The battery pack according to claim 9, characterized in that: A first adhesive layer (7) is sandwiched between the pressure strip (6) and the outer shell (111); and / or a second adhesive layer (8) is sandwiched between the pressure strip (6) and the cover body (53).

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