Battery pack

Abstract

The invention discloses a battery pack, and belongs to the technical field of batteries, the battery pack comprises a battery box body, a battery module and a heat conduction structural adhesive, the battery module is located in the battery box body, the battery module comprises at least two rows of battery rows and insulating plates, the at least two rows of battery rows are arranged side by side along the X direction, the insulating plates are respectively arranged on two sides of the battery rows along the Y direction, and the heat conduction structural adhesive is arranged in the battery box body. The same ends of at least two rows of battery rows arranged side by side share one insulating plate, and a first channel is enclosed between the junction of two adjacent rows of battery rows and the insulating plate; a second channel is arranged on one side, facing the battery row, of the insulating plate along the Y direction, a fluid inlet of the second channel is positioned on one side, close to the bottom surface of the battery box body, of the insulating plate along the Z direction, and the first channel is communicated with the fluid inlet; the heat-conducting structural adhesive is arranged between the battery module and the bottom surface of the battery box body; and when the battery module is arranged in the battery box body, gas in the heat-conducting structural adhesive can be discharged through the first channel and the second channel, and the overflowed heat-conducting structural adhesive can be accommodated.

Description

TECHNICAL FIELD

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

[0002] Most battery packs adopt the CTP scheme, that is, the battery cells are directly placed in the battery pack after being stacked. In the production process of the battery pack, the battery module and the battery box body are fixed through the heat-conducting structural adhesive, and the battery cell and the heat insulation material are directly pre-fixed through the double-sided adhesive. Therefore, the overall structural strength of the battery module is weak, and vibration failure problems are prone to occur.

[0003] In related technologies, the heat-conducting structural adhesive is arranged in the bottom of the battery module or the mounting cavity of the battery box body, and the clamping device is used to clamp the battery module and place it in the mounting cavity. During the process of placing the battery module in the box, the battery module is first squeezed to be smaller than the size of the mounting cavity. After the battery module enters the mounting cavity to a height of 1 / 3-1 / 2, the clamping device is loosened, and the battery module is pressed in from top to bottom. Due to the large size of the adhesive area at the bottom of the battery module, combined with the influence of the flatness of the cold plate, there is air between the bottom of the battery module and the adhesive interface during the pressing process of the battery module. The air flows along with the spreading of the adhesive during the pressing process of the battery module, and finally stays at the end of the battery module close to the frame beam of the battery box body. At the same time, a closed space is formed between the bottom of the battery module and the mounting cavity. When the battery module presses the heat-conducting structural adhesive, air bubbles are formed, the internal gas cannot be discharged to form air bubble areas, and a large number of air bubbles exist. Not only does this make the adhesion strength of the heat-conducting structural adhesive and the battery box body low, but also it causes the thermal resistance between the end battery cell and the cold plate to increase, affecting the thermal management performance. SUMMARY

[0004] The purpose of the present application is to provide a battery pack to solve the technical problem that the gas cannot be discharged during the process of placing the battery cell module in the box, resulting in the formation of air bubble areas in the heat-conducting structural adhesive.

[0005] As conceived above, the technical solution adopted by the present application is:

[0006] A battery pack comprises:

[0007] a battery box body;

[0008] a battery module located in the battery box body, the battery module comprising:

[0009] at least two rows of battery banks and an insulation plate, the at least two rows of battery banks are arranged side by side along an X direction, the insulation plate is arranged on both sides of the battery banks along a Y direction respectively, one insulation plate is shared by the same end of the at least two rows of battery banks arranged side by side, a first channel is formed between the intersection of two adjacent rows of battery banks and the insulation plate; a second channel is arranged on the side of the insulation plate facing the battery banks along the Y direction, a fluid inlet of the second channel is located on the side of the insulation plate close to the bottom surface of the battery box along a Z direction, and the first channel is in communication with the fluid inlet; and,

[0010] a heat-conducting structural adhesive is arranged between the battery module and the bottom surface of the battery box to bond and fix the two;

[0011] When the battery module is assembled into the battery box, the gas in the heat-conducting structural adhesive can be discharged through the first channel and the second channel, and the overflow of the heat-conducting structural adhesive can be accommodated;

[0012] The X direction is the width direction of the battery module, the Y direction is the length direction of the battery module, and the Z direction is the height direction of the battery module.

[0013] Preferably, the fluid inlet extends along the X direction on the insulation plate and penetrates to at least one end of the insulation plate along the X direction.

[0014] Preferably, the second channel extends along the Z direction, and the height of the fluid inlet along the Z direction gradually increases in the direction away from the second channel on both sides of the second channel along the X direction.

[0015] Preferably, one second channel is arranged corresponding to each row of battery banks, and the second channel is located at the middle position of the battery bank along the X direction.

[0016] Preferably, the battery module includes two rows of battery banks, the first channel is located between the two second channels, and the height of the fluid inlet along the Z direction gradually increases in the direction from the second channel to the first channel.

[0017] Preferably, an end heat insulation pad is arranged on both sides of each row of battery banks along the Y direction, and the end heat insulation pad is arranged on the side of the insulation plate close to the battery bank.

[0018] The end heat insulation pad is arranged away from the bottom surface of the battery box on the side close to the bottom surface of the battery box along the Z direction to avoid at least part of the fluid inlet, and the end heat insulation pads of two adjacent rows of battery banks are arranged away from each other to avoid the first channel.

[0019] As preferred, the battery row comprises a plurality of battery monomers arranged along the Y direction, and a heat protection structure is arranged between each two adjacent battery monomers, and the heat protection structure is provided with a containing groove on the side close to the bottom surface of the battery box along the Z direction to contain the heat conduction structure glue.

[0020] As preferred, the heat protection structure comprises a phase change material layer and a heat insulation material layer which are attached to each other, and the phase change material layer is on one side of the battery monomer along the Y direction, and the heat insulation material layer is on the other side of the battery monomer along the Y direction.

[0021] As preferred, the heat insulation material layer is sleeved with a buffer frame, and the buffer frame is open on the side close to the bottom surface of the battery box along the Z direction to form the containing groove.

[0022] As preferred, the phase change material layer comprises an aluminum plastic film shell and a phase change heat insulation material arranged in the aluminum plastic film shell, and at least part of the phase change material layer is overlapped with a heat conduction layer which is attached to the battery monomer, and the heat conduction layer is provided with the containing groove on the side close to the bottom surface of the battery box along the Z direction.

[0023] The beneficial effects of the present application are as follows:

[0024] The battery pack provided by the present application is characterized in that the battery module is located in the battery box, the battery module comprises at least two rows of battery rows and an insulation plate, the at least two rows of battery rows are arranged side by side along the X direction, the insulation plate is arranged on both sides of the battery row along the Y direction respectively, and one insulation plate is shared by the same end of the at least two rows of battery rows arranged side by side, so as to reduce the number of insulation plates and increase the structural strength. The first channel is formed between the junction of the two adjacent rows of battery rows and the insulation plate, the second channel is arranged on the side of the insulation plate facing the battery row along the Y direction, the fluid inlet of the second channel is located on the side of the insulation plate close to the bottom surface of the battery box along the Z direction, the first channel is in communication with the fluid inlet, and the gap between the two adjacent rows of battery rows is fully utilized; the heat conduction structure glue is arranged between the battery module and the bottom surface of the battery box, so as to bond and fix the two together, when the battery module is assembled into the battery box, the gas in the heat conduction structure glue can be discharged through the first channel and the second channel, and the overflowed heat conduction structure glue can be contained, so as to avoid the formation of bubble cavity area between the battery module and the battery box, improve the bonding strength of the heat conduction structure glue and the battery box, ensure the continuity of the heat conduction path in the battery pack, and improve the heat conduction efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is the first schematic view of part of the battery pack provided by the embodiment of the present application;

[0026] Figure 2is a second schematic view of a partial structure of the battery pack provided by an embodiment of the present application;

[0027] Figure 3 is a third schematic view of a partial structure of the battery pack provided by an embodiment of the present application;

[0028] Figure 4 is Figure 3 is an enlarged view of A of

[0029] Figure 5 is an exploded schematic view of a partial structure of the battery pack provided by an embodiment of the present application;

[0030] Figure 6 is a schematic view of an insulation plate provided by an embodiment of the present application;

[0031] Figure 7 is a schematic view of the insulation plate cooperating with an end heat insulation pad provided by an embodiment of the present application;

[0032] Figure 8 is a side view of a partial structure of the battery pack provided by an embodiment of the present application;

[0033] Figure 9 is Figure 8 is an enlarged view of B of

[0034] Figure 10 is a schematic view of a battery row provided by an embodiment of the present application;

[0035] Figure 11 is a first schematic view of a heat protection structure provided by an embodiment of the present application;

[0036] Figure 12 is a second schematic view of a heat protection structure provided by an embodiment of the present application;

[0037] Figure 13 is an exploded schematic view of a heat protection structure provided by an embodiment of the present application.

[0038] In the drawings:

[0039] 100, battery module;

[0040] 10, battery row; 101, first channel; 11, battery monomer; 12, heat protection structure; 121, accommodating groove; 122, phase change material layer; 123, heat insulation material layer; 124, buffer frame; 125, heat conduction layer;

[0041] 20, insulation plate; 21, second channel; 211, fluid inlet; 212, fluid outlet;

[0042] 30, end heat insulation pad;

[0043] 200, heat-conducting structural adhesive; 300, middle water-cooling plate; 400, bottom water-cooling plate. DETAILED DESCRIPTION

[0044] Embodiments of the present application are described in detail below with reference to the accompanying drawings, in which the same or similar components have the same or similar designations and functions throughout the various figures and embodiments. The embodiments described below are exemplary and are intended to explain the present application, and are not to be understood as limiting the present application.

[0045] In the description of the present application, unless specifically defined and limited otherwise, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] In the present application, unless specifically defined and limited otherwise, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0047] The technical solutions of the present application are further illustrated below in conjunction with the drawings and through specific embodiments.

[0048] Referring to Figures 1 to 13 The present embodiment provides a battery pack, comprising a battery box, a battery module 100 and a heat-conducting structural adhesive 200. The battery module 100 is located in the battery box, and the heat-conducting structural adhesive 200 is arranged between the battery module 100 and the bottom surface of the battery box to bond and fix the two. Specifically, the battery box has a mounting cavity, the heat-conducting structural adhesive 200 is arranged on the bottom wall of the mounting cavity, and the battery module 100 is arranged in the mounting cavity.

[0049] The battery module 100 comprises at least two rows of battery rows 10 arranged side by side along the X direction and insulating plates 20 arranged on both sides of the battery rows 10 along the Y direction. In this embodiment, the X direction is the width direction of the battery module 100, the Y direction is the length direction of the battery module 100, and the Z direction is the height direction of the battery module 100. Figure 1 and Figure 2 The X, Y and Z directions are shown by arrows in

[0050] The same end of the at least two rows of battery rows 10 arranged side by side shares one insulating plate 20, so as to reduce the number of insulating plates 20 and increase the structural strength. The junction of the adjacent two rows of battery rows 10 and the insulating plate 20 form a first channel 101, as shown in Figure 4 The second channel 21 is arranged on one side of the insulating plate 20 facing the battery row 10 along the Y direction, as shown in Figure 2 and Figure 6 The fluid inlet 211 of the second channel 21 is located on one side of the insulating plate 20 close to the bottom surface of the battery box along the Z direction, and the first channel 101 is in communication with the fluid inlet 211.

[0051] When the battery module 100 is loaded into the battery box, a closed space is formed between the bottom of the battery module 100 and the battery box. When the battery module 100 is extruded by the heat-conducting structural adhesive 200, it is difficult for the gas inside to be discharged. By arranging the first channel 101 and the second channel 21, the gas in the heat-conducting structural adhesive 200 can be discharged, and the overflow of the heat-conducting structural adhesive 200 can be accommodated, so as to avoid the formation of a bubble cavity area between the battery module 100 and the battery box, improve the bonding strength of the heat-conducting structural adhesive 200 and the battery box, ensure the continuity of the heat-conducting path in the battery pack, and improve the heat conduction efficiency.

[0052] The number of battery rows 10 can be set according to actual needs. In some embodiments, the battery module 100 comprises two rows of battery rows 10 arranged side by side along the X direction, and insulating plates 20 arranged on both sides of the battery rows 10 along the Y direction. The insulating plates 20 are provided with two insulating plates 20, and the same end of the two rows of battery rows 10 shares one insulating plate 20. In some embodiments, the battery module 100 comprises three rows of battery rows 10 arranged side by side along the X direction, and insulating plates 20 arranged on both sides of the battery rows 10 along the Y direction. The insulating plates 20 are provided with two insulating plates 20, and the same end of the three rows of battery rows 10 shares one insulating plate 20. In some embodiments, the battery module 100 comprises four rows of battery rows 10 arranged side by side along the X direction, and insulating plates 20 arranged on both sides of the battery rows 10 along the Y direction. The insulating plates 20 are provided with four insulating plates 20, and the same end of every two rows of battery rows 10 shares one insulating plate 20.

[0053] The battery row 10 includes a plurality of battery cells 11 arranged along the Y direction. As shown in Figure 4 The corner of the shell of the battery cell 11 is usually provided with a rounded corner, so that a gap is formed between the junction of the two adjacent battery rows 10 and the insulation plate 20, which is used as the first channel 101. In this way, the existing structure is fully utilized to exhaust and overflow the glue without affecting the structural strength of the insulation plate 20, thereby reducing the cost.

[0054] It can be understood that the first channel 101 extends linearly along the Z direction, the bottom of the first channel 101 is in communication with the fluid inlet 211, and the top of the first channel 101 is used to discharge the fluid. When the heat-conducting structural glue 200 enters the first channel 101, it can play a bonding role between the adjacent battery rows 10 and the insulation plate 20, so that the connection is more firm.

[0055] The number of the second channels 21 provided on the insulation plate 20 can be set according to actual needs. While ensuring exhaust and glue overflow, the structural strength of the insulation plate 20 is also taken into account. Therefore, the number of the second channels 21 should not be too much. The cross-sectional shape of the second channel 21 can be U-shaped, V-shaped, trapezoidal, semicircular or rectangular.

[0056] The fluid inlet 211 of the second channel 21 is located on the side of the insulation plate 20 close to the bottom surface of the battery box along the Z direction, so that the heat-conducting structural glue 200 between the bottom of the battery module 100 and the battery box can enter the fluid inlet 211. The fluid inlet 211 can be provided with one or more. Exemplarily, the fluid inlet 211 extends along the X direction on the insulation plate 20 and penetrates at least one end of the insulation plate 20 along the X direction. By penetrating the fluid inlet 211 along the X direction to at least one end of the insulation plate 20, the end of the insulation plate 20 along the X direction can discharge gas and glue. The heat-conducting structural glue 200 overflowing at the end along the X direction can bond between the adjacent insulation plates 20, thereby enhancing the structural strength.

[0057] Exemplarily, the fluid inlet 211 extends along the X direction on the insulation plate 20 and penetrates both ends of the insulation plate 20 along the X direction. The heat-conducting structural glue 200 between the bottom of the battery module 100 and the battery box can enter along the fluid inlet 211 and be discharged from both ends of the insulation plate 20 along the X direction. Part of the heat-conducting structural glue 200 can enter the second channel 21 along the fluid inlet 211.

[0058] The second channel 21 has a fluid outlet 212, and the fluid can enter the second channel 21 from the fluid inlet 211 and flow along the second channel 21 to the fluid outlet 212. The fluid can be gas or glue of the heat-conducting structural glue 200. Before the heat-conducting structural glue 200 solidifies, the glue can flow in the form of liquid.

[0059] The fluid outlet 212 can be arranged on one side of the insulation plate 20 away from the bottom surface of the battery box in the Z direction. The fluid outlet 212 can also be arranged on both sides of the insulation plate 20 in the X direction. Each second channel 21 can have one fluid outlet 212, or two or more fluid outlets 212.

[0060] The second channel 21 can extend in a straight line, and the airflow flows more smoothly along the second channel 21, the airflow resistance is small, and the exhaust is facilitated. In other embodiments, the second channel 21 can extend in an oblique line or a curve to lengthen the path of the second channel 21 and accommodate more overflow of the thermally conductive structural adhesive 200.

[0061] In this embodiment, the second channel 21 extends in the Z direction, as shown in Figure 6 The second channel 21 extends in a straight line in the Z direction, and the fluid outlet 212 of the second channel 21 is arranged on one side of the insulation plate 20 away from the bottom surface of the battery box in the Z direction. Through the arrangement of the second channel 21, combined with the fluid inlet 211 penetrating through both ends of the insulation plate 20 in the X direction on the insulation plate 20, the top and both ends of the insulation plate 20 can be exhausted and overflowed.

[0062] The height of the fluid inlet 211 in the Z direction gradually increases in the direction away from the second channel 21 on both sides of the second channel 21 in the X direction. When the battery module 100 is loaded into the battery box, the battery module 100 extrudes the thermally conductive structural adhesive 200, so that the thermally conductive structural adhesive 200 flows to both sides, and therefore the height of the fluid inlet 211 is set to facilitate glue discharge. In other embodiments, the height of the fluid inlet 211 in the Z direction is uniform along the X direction of the insulation plate 20, which is convenient for processing and production.

[0063] Corresponding to each row of battery rows 10, one second channel 21 can be arranged, or multiple second channels 21 can be arranged. Exemplarily, one second channel 21 is arranged corresponding to each row of battery rows 10, and the second channel 21 is located at the middle position of the battery row 10 in the X direction. When the battery module 100 is loaded into the battery box, the battery module 100 extrudes the thermally conductive structural adhesive 200, and the thermally conductive structural adhesive 200 in the middle region of the battery module 100 advances to both sides. By arranging the second channel 21 at the middle position of the battery row 10 in the X direction, the gas at both ends of the battery module 100 in the Y direction can be discharged to the maximum extent, while taking into account the flow of the thermally conductive structural adhesive 200, solving the problem of long exhaust path caused by the long length of the battery module 100.

[0064] For example, the battery module 100 includes two rows of battery cells 10, which share a common insulating plate 20 at the same end. The first channel 101 is located between the two second channels 21, and the height of the fluid inlet 211 along the Z direction gradually increases from the second channel 21 to the first channel 101. This gradual increase in the height of the fluid inlet 211 along the Z direction from the second channel 21 to the first channel 101 facilitates the flow of the thermally conductive structural adhesive 200 from the central region of the battery module 100 to the sides, thereby preventing accumulation of the thermally conductive structural adhesive 200 in the central region.

[0065] Through the cooperation of the above-mentioned fluid inlet 211, the first channel 101 and the second channel 21, when the battery module 100 is loaded into the battery case, the thermally conductive structural adhesive 200 flows along the fluid inlet 211, part of the thermally conductive structural adhesive 200 enters the first channel 101, and part of the thermally conductive structural adhesive 200 enters the second channel 21, thereby solving the problem of easy formation of cavitation areas inside the thermally conductive structural adhesive 200, improving the bonding strength between the thermally conductive structural adhesive 200 and the battery case, and at the same time ensuring the continuity of the heat conduction path in the battery pack, thereby improving the heat conduction efficiency.

[0066] In order to further improve the heat conduction efficiency, each battery row 10 is provided with end insulation pads 30 on both sides along the Y direction. Figure 4 and Figure 5 The end thermal insulation pad 30 is provided on the side of the insulating plate 20 close to the battery row 10. The end thermal insulation pad 30 is used to block heat transfer, prevent thermal runaway from spreading, and play a role of mechanical buffering and electrical insulation.

[0067] See also Figures 7 to 9 , the end thermal insulation pad 30 is spaced apart from the bottom surface of the battery case on one side close to the bottom surface of the battery case along the Z direction to avoid at least part of the fluid inlet 211, and the end thermal insulation pads 30 of two adjacent rows of battery rows 10 are spaced apart to avoid the first channel 101. While used for heat insulation, the end thermal insulation pad 30 avoids the flow path of gas and colloid, and does not affect the exhaust and glue overflow of the fluid inlet 211 and the first channel 101. When the battery module 100 is loaded into the battery case, the battery module 100 squeezes the thermal conductive structural adhesive 200 to flow toward the fluid inlet 211, and the thermal conductive structural adhesive 200 fills the bottom of the end thermal insulation pad 30, and part of the thermal conductive structural adhesive 200 enters the first channel 101 and the second channel 21, thereby improving the bonding strength of the end thermal insulation pad 30, the insulating plate 20, the battery module 100 and the battery case.

[0068] See also Figures 1 to 5 A middle water-cooling plate 300 is located between two adjacent rows of battery cells 10, and a bottom water-cooling plate 400 is located at the bottom of each battery cell. The middle water-cooling plate 300 and the bottom water-cooling plate 400 work together to dissipate heat from the battery cells 10, preventing thermal runaway and improving battery life.

[0069] It should be noted that the bottom height of the insulation plate 20 and the end heat insulation pad 30 is not consistent, and the bottom height of the end heat insulation pad 30 is smaller than that of the insulation plate 20. On the one hand, it is to ensure the path of the intermediate heat conduction structure glue 200 moving to the insulation plate 20 during the process of the battery module 100 entering the box. On the other hand, while the heat conduction structure glue 200 flows to the insulation plate 20, it will fill the height difference between the bottom of the end heat insulation pad 30 and the bottom of the water-cooled plate 400 and the second channel 21 during the process of the extruded air moving to both sides and the top of the battery row 10. After the heat conduction structure glue 200 solidifies, it plays a role in strengthening the connection between the insulation plate 20, the end heat insulation pad 30 and the battery box, and improves the structural strength of the battery module 100 and the battery pack.

[0070] In addition, in order to avoid the problem of air blockage caused by the heat conduction structure glue 200 filling the two sides of the battery row 10 first during the extrusion and movement process, the fluid inlet 211 of the insulation plate 20 is designed as a "horn" shape with a small inside and a large outside. In this way, the heat conduction structure glue 200 in the middle area pushes the air to move to both sides, which can improve the exhaust efficiency and improve the glue pressing effect of the heat conduction structure glue 200.

[0071] Referring to Figure 1 , Figure 2 , Figure 5 , Figures 10 to 13 , the battery row 10 includes a plurality of battery monomers 11, and the plurality of battery monomers 11 are arranged along the Y direction. A heat protection structure 12 is arranged between each adjacent two battery monomers 11, and the heat protection structure 12 is arranged on the side close to the bottom surface of the battery box along the Z direction. The heat protection structure 12 is provided with a containing groove 121 to contain the heat conduction structure glue 200. The heat protection structure 12 is used to block heat transfer, and when one of the battery monomers 11 is out of control, the heat protection structure 12 can slow down the spread of heat to other battery monomers 11. By arranging the containing groove 121 on the side of the heat protection structure 12 close to the bottom surface of the battery box along the Z direction, the heat conduction structure glue 200 can be contained, and the bonding strength of the battery module 100 and the battery box is improved.

[0072] In the embodiment, the thermal protection structure 12 includes a phase change material layer 122 and a thermal insulation material layer 123 which are attached to each other, the phase change material layer 122 is located on one side of the battery monomer 11 along the Y direction, and the thermal insulation material layer 123 is located on the other side of the battery monomer 11 along the Y direction. The thermal insulation material layer 123 can play a heat insulation role, and when one of the battery monomers 11 is in thermal runaway, the thermal insulation material layer 123 can slow down the spread of heat to other battery monomers 11; the phase change material layer 122 can play a role of quickly absorbing heat to avoid the temperature of the battery monomer 11 being too high; at the same time, the small amount of heat passing through the thermal insulation material layer 123 can be absorbed by the phase change material layer 122, further ensuring the safety performance of the battery module 100. Since the phase change material layer 122 can absorb the heat passing through the thermal insulation material layer 123, a thermal insulation material layer 123 with a large thickness does not need to be selected, thereby reducing the cost.

[0073] In the related battery pack, only a thermal insulation material is arranged to play a thermal runaway heat insulation effect. When the battery core is high-rate charged, since the rate can reach 4-6C, the heat generated by the battery core cannot be quickly and completely discharged through the bottom water-cooled plate in a short time, causing the battery core to rapidly increase in temperature and affecting the fast charging performance. The thermal protection structure 12 arranged in the embodiment includes a phase change material layer 122 and a thermal insulation material layer 123, and the phase change material layer 122 and the thermal insulation material layer 123 are respectively arranged on the two sides of the battery monomer 11, which can not only play a heat insulation role but also quickly absorb heat without affecting the fast charging performance.

[0074] Exemplarily, the thermal insulation material layer 123 is sleeved with a buffer frame 124, and the buffer frame 124 is open on the side close to the bottom surface of the battery box along the Z direction to form a containing groove 121. The buffer frame 124 is arranged to enable the thermal insulation material layer 123 to be closely attached to the battery monomer 11, to realize face-to-face contact with the battery monomer 11, and to improve the heat insulation effect; the buffer frame 124 is open on the side close to the bottom surface of the battery box along the Z direction to form the containing groove 121, which facilitates the filling of the heat conduction structure adhesive 200 and enables the buffer frame 124 to be firmly bonded to the thermal insulation material layer 123 with the help of the heat conduction structure adhesive 200.

[0075] The thermal insulation material layer 123 can be silicon foam or aerogel, and the buffer frame 124 can be a silica gel frame.

[0076] Exemplarily, the phase change material layer 122 includes an aluminum plastic film shell and a phase change heat insulation material arranged in the aluminum plastic film shell, at least part of the phase change material layer 122 is sleeved with a heat conduction layer 125, the heat conduction layer 125 is attached to the battery monomer 11, and the heat conduction layer 125 is provided with the containing groove 121 on the side close to the bottom surface of the battery box along the Z direction.

[0077] When the temperature does not reach the phase change temperature of the phase change thermal insulation material, heat is transferred through the phase change thermal insulation material in the form of heat conduction. When the temperature rises to the phase change temperature, the phase change thermal insulation material absorbs a large amount of heat without changing the temperature by changing the state of matter, thereby delaying the spread of heat. Exemplarily, the phase change temperature is 90-130°C.

[0078] The aluminum plastic film shell encapsulates the phase change thermal insulation material in the inside by hot pressing. At the edge position of the aluminum plastic film shell, only the aluminum plastic film has a small thickness due to the encapsulation hot pressing. In order to balance the heat exchange between the battery monomer 11 and the edge region of the aluminum plastic film shell, the heat conduction layer 125 is arranged. By arranging the heat conduction layer 125 to be attached to the battery monomer 11, at least part of the heat of the battery monomer 11 can be transmitted to the aluminum plastic film shell through the heat conduction layer 125, thereby ensuring the heat exchange effect.

[0079] In some embodiments, the heat conduction layer 125 is arranged at the outer peripheral edge of the phase change material layer 122. The thickness of the heat conduction layer 125 plus the thickness of the edge of the aluminum plastic film shell is equal to the thickness of the phase change material layer 122, which ensures that the phase change material layer 122 is fully attached to the battery monomer 11. In some embodiments, the outer surface of the phase change material layer 122 is arranged with the heat conduction layer 125, and the heat conduction layer 125 is attached to the battery monomer 11. Since the heat conduction layer 125 has a certain compressibility, the phase change material layer 122 can be in large-area abutment with the battery monomer 11, thereby increasing the contact area to improve the heat exchange effect.

[0080] By arranging the accommodating groove 121 on the side of the heat conduction layer 125 close to the bottom surface of the battery box in the Z direction, the heat conduction structure glue 200 can be filled, and the heat conduction layer 125 and the phase change material layer 122 can be firmly bonded by the heat conduction structure glue 200.

[0081] In the production process, a plurality of battery monomers 11 are stacked, and the thermal protection structure 12 is arranged between two adjacent battery monomers 11. One side of the battery monomer 11 in the Y direction is the phase change material layer 122, and the other side of the battery monomer 11 in the Y direction is the thermal insulation material layer 123. After the end heat insulation pads 30 are arranged on both sides of the battery row 10 in the Y direction, the insulating plates 20 are pasted on the side away from the battery row 10 of the end heat insulation pads 30, and then the battery module 100 is clamped by the clamping jaws and pressed into the battery box. The outer side of the insulating plate 20 can abut the cross beam or the frame of the battery box to constrain the plurality of battery monomers 11.

[0082] When the battery module 100 is loaded into the battery box, a closed space is formed between the bottom of the battery module 100 and the battery box, and when the battery module 100 is extruded, the heat-conducting structural adhesive 200 flows through the fluid inlet 211 to the first channel 101, the second channel 21 and the two ends of the insulating plate 20, discharges the gas in the heat-conducting structural adhesive 200 and accommodates the overflowed heat-conducting structural adhesive 200; at the same time, the heat-conducting structural adhesive 200 fills the side of the end heat insulation pad 30 close to the bottom surface of the battery box in the Z direction, and the accommodation groove 121 of the heat protection structure 12.

[0083] Exemplarily, when one of the battery monomers A occurs thermal runaway, on the one hand, the phase change material layer 122 on one side of the battery monomer A can absorb the heat released by the thermal runaway of the battery monomer A, and the battery monomer A can be cooled; on the other hand, the thermal insulation material layer 123 on the other side of the battery monomer A can block the heat of the thermal runaway from being transmitted to the normal battery monomer B, and at the same time, due to the existence of the thermal insulation material layer 123 and the phase change material layer 122 between the battery monomer B and the battery monomer A, the small amount of heat of the thermal runaway through the thermal insulation material layer 123 can be absorbed by the phase change material layer 122 again, further ensuring the safety performance of the normal battery monomer B.

[0084] When in the normal fast charging condition, most of the heat generated by the fast charging is quickly stored in the phase change material layer 122, and a small amount of heat is exchanged with the bottom water-cooled plate 400 through the heat-conducting structural adhesive 200 at the bottom, reducing the temperature of the battery monomer 11 under fast charging.

[0085] The above embodiments only illustrate the basic principles and characteristics of the present application, and the present application is not limited to the above embodiments. Without departing from the spirit and scope of the present application, various changes and modifications can be made to the present application, and these changes and modifications all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A battery pack, characterized in that: include: Battery box; A battery module (100) is located in the battery box, and the battery module (100) includes: At least two rows of battery rows (10) and an insulating plate (20), wherein the at least two rows of battery rows (10) are arranged side by side along the X direction, the insulating plates (20) are respectively arranged on both sides of the battery rows (10) along the Y direction, and the same end of the at least two rows of battery rows (10) arranged side by side shares one insulating plate (20), and a first channel (101) is formed between the junction of the two adjacent rows of battery rows (10) and the insulating plate (20); a second channel (21) is provided on one side of the insulating plate (20) facing the battery row (10) along the Y direction, a fluid inlet (211) of the second channel (21) is located on a side of the insulating plate (20) close to the bottom surface of the battery box along the Z direction, and the first channel (101) is connected to the fluid inlet (211); and, A heat-conducting structural adhesive (200) is provided between the battery module (100) and the bottom surface of the battery box to bond and fix the two together; When the battery module (100) is installed in the battery box, the gas in the thermally conductive structural adhesive (200) can be discharged through the first channel (101) and the second channel (21), and the overflowed thermally conductive structural adhesive (200) can be accommodated; The X direction is the width direction of the battery module (100), the Y direction is the length direction of the battery module (100), and the Z direction is the height direction of the battery module (100).

2. The battery pack according to claim 1, wherein: The fluid inlet (211) extends along the X direction on the insulating plate (20) and penetrates to at least one end of the insulating plate (20) along the X direction.

3. The battery pack according to claim 2, wherein: The second channel (21) extends along the Z direction, and the height of the fluid inlet (211) along the Z direction gradually increases in a direction away from the second channel (21) on both sides of the second channel (21) along the X direction.

4. The battery pack according to claim 3, wherein: One second channel (21) is provided corresponding to each row of the battery rows (10), and the second channel (21) is located in the middle of the battery rows (10) along the X direction.

5. The battery pack according to claim 4, characterized in that: The battery module (100) comprises two rows of battery rows (10), the first channel (101) is located between two second channels (21), and the height of the fluid inlet (211) along the Z direction gradually increases from the second channel (21) to the first channel (101).

6. The battery pack according to claim 1, wherein: Each battery row (10) is provided with end thermal insulation pads (30) on both sides along the Y direction, and the end thermal insulation pads (30) are provided on a side of the insulating plate (20) close to the battery row (10); The end thermal insulation pad (30) is spaced apart from the bottom surface of the battery case on one side thereof close to the bottom surface of the battery case along the Z direction to avoid at least a portion of the fluid inlet (211), and the end thermal insulation pads (30) of two adjacent rows of battery rows (10) are spaced apart to avoid the first channel (101).

7. The battery pack according to any one of claims 1 to 6, characterized in that: The battery row (10) comprises a plurality of battery cells (11), the plurality of battery cells (11) being arranged along the Y direction, a heat protection structure (12) being provided between each two adjacent battery cells (11), and a receiving groove (121) being provided on one side of the heat protection structure (12) close to the bottom surface of the battery box along the Z direction for receiving the heat conductive structural adhesive (200).

8. The battery pack according to claim 7, characterized in that: The heat protection structure (12) comprises a phase change material layer (122) and a heat insulation material layer (123) adhered to each other; one side of the battery cell (11) along the Y direction is the phase change material layer (122); and the other side of the battery cell (11) along the Y direction is the heat insulation material layer (123).

9. The battery pack according to claim 8, characterized in that: A buffer frame (124) is provided on the outer periphery of the heat-insulating material layer (123); the buffer frame (124) is opened along the Z direction at one side close to the bottom surface of the battery box to form the accommodating groove (121).

10. The battery pack according to claim 8, wherein: The phase change material layer (122) comprises an aluminum-plastic film shell and a phase change heat insulating material arranged in the aluminum-plastic film shell. A heat conductive layer (125) is stacked on at least a portion of the phase change material layer (122). The heat conductive layer (125) is attached to the battery cell (11). The heat conductive layer (125) is provided with the accommodating groove (121) on one side of the heat conductive layer (125) close to the bottom surface of the battery box along the Z direction.

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