Battery module and battery pack

Abstract

The invention discloses a battery module and a battery pack, and belongs to the technical field of batteries, the battery module is located in a battery box body, the battery module comprises battery cell modules and end plates arranged on the two sides of the multiple battery cell modules respectively in the X direction, and exhaust glue overflow channels are formed in the end plates; a fluid inlet of the exhausting and glue overflowing channel is positioned at one end, close to the bottom surface of the battery box body, of the end plate along the Z direction; the exhausting and glue overflowing channel is configured to exhaust gas in the heat-conducting structural glue between the battery cell module and the battery box body and accommodate the overflowing heat-conducting structural glue when the battery cell module enters the box; the X direction is the length direction of the battery cell module, and the Z direction is the height direction of the battery cell module. The battery pack comprises a battery box body with a mounting cavity and the battery module positioned in the mounting cavity. Gas is exhausted through the exhaust and glue overflow channel, and the overflowed heat-conducting structural glue is accommodated, so that a bubble cavity area is prevented from being formed between the battery cell module and the battery box body, and the bonding strength and the heat exchange effect are ensured.

Description

TECHNICAL FIELD

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

[0002] In the battery production process, the battery cell module and the battery box body are fixed by the heat-conducting structure glue. In the related art, the heat-conducting structure glue is arranged in the bottom of the battery cell module or the mounting cavity of the battery box body, and a clamping device is used to clamp the battery cell module in the mounting cavity. In the process of entering the box, the battery cell module is first squeezed to be smaller than the size of the mounting cavity, and after the battery cell module enters the mounting cavity to a height of 1 / 3-1 / 2, the clamping device is loosened, and the battery cell module is pressed in from top to bottom. During the pressing process, a closed space is formed between the bottom of the battery cell module and the mounting cavity, and when the battery cell module presses open the heat-conducting structure glue, the internal gas cannot be discharged to form a bubble area, so that the bonding strength of the heat-conducting structure glue and the battery box body is low, and the heat exchange effect of the cold plate and the battery cell module is poor. SUMMARY

[0003] The purpose of the present application is to provide a battery module and a battery pack to solve the technical problem that in the prior art, the gas cannot be discharged during the process of entering the battery cell module into the box, so that the heat-conducting structure glue forms a bubble area.

[0004] As conceived above, the technical solution adopted by the present application is:

[0005] A battery module is located in a battery box body, the battery module includes a battery cell module and end plates arranged on both sides of the battery cell module along an X direction, an exhaust overflow glue channel is arranged on the end plate, a fluid inlet of the exhaust overflow glue channel is located at one end of the end plate close to the bottom surface of the battery box body along a Z direction, and the exhaust overflow glue channel is configured to discharge the gas in the heat-conducting structure glue between the battery cell module and the battery box body and accommodate the overflow heat-conducting structure glue when the battery cell module enters the box; the X direction is the length direction of the battery cell module, and the Z direction is the height direction of the battery cell module.

[0006] In some embodiments, the exhaust overflow glue channel extends along the Z direction, or at least part of the exhaust overflow glue channel extends along a Y direction, and the Y direction is the width direction of the battery cell module.

[0007] Along the X direction, the end plate has a first side face facing the battery cell module and a second side face facing away from the battery cell module, and the first side face and / or the second side face is / are provided with the exhaust overflow glue channel.

[0008] In some embodiments, the end plate is provided with a plurality of exhaust overflow channels arranged at intervals along the Y direction, and the flow area of the exhaust overflow channel closer to the middle of the end plate is larger than that of the exhaust overflow channel farther from the middle of the end plate.

[0009] And / or, the flow area of the exhaust overflow channel with a longer extension path is larger than that of the exhaust overflow channel with a shorter extension path.

[0010] In some embodiments, the end plate is provided with a through hole penetrating at least part of the exhaust overflow channel along the X direction, and the through hole is in communication with at least one of the exhaust overflow channels.

[0011] In some embodiments, the end plate is provided with a guide groove forming the fluid inlet, and the flow area of the guide groove gradually decreases along the direction of fluid entry.

[0012] Downstream of the guide groove, the flow area of the exhaust overflow channel gradually increases along the direction of fluid flow, or downstream of the guide groove, the exhaust overflow channel comprises at least two sections of channels in sequence, and the flow area of the latter section of the channel is larger than that of the former section of the channel along the direction of fluid flow.

[0013] In some embodiments, the end plate is provided with a guide slope near the side of the bottom surface of the battery box, and the guide slope is in communication with the fluid inlet to guide the flow of fluid to the fluid inlet.

[0014] In some embodiments, a plurality of heat-conducting structural adhesives are arranged at intervals on the bottom surface of the battery box, and at least one fluid inlet is arranged on the end plate between each adjacent pair of heat-conducting structural adhesives.

[0015] The width of the inlet end of the fluid inlet is greater than or equal to the spacing between adjacent pairs of heat-conducting structural adhesives.

[0016] A battery pack comprising a battery box having a mounting cavity and a battery module as described above located in the mounting cavity.

[0017] In some embodiments, the battery box comprises a support beam, and the side of the end plate away from the battery cell module is connected to the support beam, and the side of the support beam facing the end plate is provided with an auxiliary exhaust overflow channel having a fluid inlet; the fluid inlet is in communication with the mounting cavity, or the fluid inlet is in communication with the exhaust overflow channel.

[0018] In some embodiments, the end plate is an insulating member.

[0019] The beneficial effects of the present application are as follows:

[0020] The battery module provided by the present application comprises a cell module and end plates arranged on both sides of the plurality of cell modules along the X direction, the end plates are provided with exhaust glue overflow channels, the fluid inlet of the exhaust glue overflow channel is close to one end of the bottom surface of the battery box along the Z direction, and the exhaust glue overflow channel is configured to exhaust the gas in the heat-conducting structural glue between the cell module and the battery box and accommodate the overflow heat-conducting structural glue when the cell module enters the box, so that the bubble cavity area is avoided to be formed between the cell module and the battery box, and the bonding strength and heat exchange effect are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic diagram of a battery pack provided by an embodiment of the present application;

[0022] Figure 2 is an exploded structural schematic diagram of a battery pack provided by an embodiment of the present application;

[0023] Figure 3 is a first structural schematic diagram of a battery module provided by an embodiment of the present application;

[0024] Figure 4 is a structural schematic diagram of a first end plate provided by an embodiment of the present application;

[0025] Figure 5 is a structural schematic diagram of a second end plate provided by an embodiment of the present application;

[0026] Figure 6 is a structural schematic diagram of a third end plate provided by an embodiment of the present application;

[0027] Figure 7 is an enlarged view of A of Figure 6

[0028] Figure 8 is a structural schematic diagram of a fourth end plate provided by an embodiment of the present application;

[0029] Figure 9 is a second structural schematic diagram of a battery module provided by an embodiment of the present application;

[0030] Figure 10 is a schematic diagram of an end plate and heat-conducting structural glue provided by an embodiment of the present application;

[0031] Figure 11 is a partial structural schematic diagram of a battery pack provided by an embodiment of the present application;

[0032] Figure 12 is a structural schematic diagram of a support beam provided by an embodiment of the present application;

[0033] Figure 13 is Figure 12 ​An enlarged view of B in FIG.

[0034] In the drawings:

[0035] 1. cell module;

[0036] 2. end plate; 21, exhaust overflow channel; 211, fluid inlet; 212, fluid outlet; 22, first side; 23, second side; 24, guide groove; 25, through hole; 26, guide inclined surface;

[0037] 10. battery box; 11, mounting cavity; 12, support beam; 121, auxiliary exhaust overflow channel; 1211, fluid inlet; 122, guide port;

[0038] 20. thermally conductive structural adhesive. DETAILED DESCRIPTION

[0039] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein the same or like reference numerals and characters in different figures denote the same or like components or elements having the same or similar functions. The embodiments described below are exemplary and are intended to provide examples of the present application, and are not intended to limit the present application.

[0040] In the description of the present application, unless otherwise clearly specified and limited, 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.

[0041] In the present application, unless otherwise clearly specified and limited, 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 horizontal height of the first feature is higher than that of the second feature. The first feature "below", "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 horizontal height of the first feature is less than that of the second feature.

[0042] The technical solutions of the present application are further illustrated below in conjunction with the drawings and through specific embodiments.

[0043] As Figures 1 to 3As shown, the embodiment provides a battery pack, which comprises a battery box 10 and a battery module. The battery box 10 has a mounting cavity 11, and the battery module is arranged in the battery box 10, specifically in the mounting cavity 11.

[0044] The battery module comprises a plurality of cell modules 1 and end plates 2 arranged on both sides of the plurality of cell modules 1 along an X direction, and the X direction is the length direction of the cell module 1. During the process of entering the box, the cell module 1 is first squeezed to be smaller than the size of the mounting cavity 11, and after the cell module 1 enters 1 / 3-1 / 2 height of the mounting cavity 11, the clamping device is loosened, and the cell module 1 is pressed from top to bottom. The clamping device can adopt an existing mechanical hand.

[0045] As shown, Figure 4 The end plate 2 is provided with an exhaust glue overflow channel 21, and the fluid inlet 211 of the exhaust glue overflow channel 21 is located at one end of the end plate 2 close to the bottom surface of the battery box 10 along the Z direction. The exhaust glue overflow channel 21 is configured to exhaust the gas in the heat-conducting structural glue 20 between the cell module 1 and the battery box 10 and accommodate the overflow heat-conducting structural glue 20 when the cell module 1 enters the box; and the Z direction is the height direction of the cell module 1. After the cell module 1 enters the box, a closed space is formed between the bottom of the cell module 1 and the battery box 10. When the heat-conducting structural glue 20 is squeezed, it is difficult to exhaust the gas inside. By setting the exhaust glue overflow channel 21 to exhaust the gas and accommodate the overflow heat-conducting structural glue 20, the formation of bubble cavity area between the cell module 1 and the battery box 10 is avoided, the bonding strength of the heat-conducting structural glue 20 and the battery box 10 is improved, and the continuity of the heat-conducting path in the battery pack is ensured, thereby improving the heat conduction efficiency.

[0046] The exhaust glue overflow channel 21 can be arranged on the inner surface of the end plate 2, or on the outer surface of the end plate 2, or on both the inner surface and the outer surface of the end plate 2. When the exhaust glue overflow channel 21 is arranged on the outer surface of the end plate 2, the cross-sectional shape of the exhaust glue overflow channel 21 can be U-shaped, V-shaped, trapezoidal, semicircular or rectangular.

[0047] The exhaust glue overflow channel 21 also has a fluid outlet 212, and the fluid can flow into the exhaust glue overflow channel 21 from the fluid inlet 211 and flow along the exhaust glue overflow channel 21 to the fluid outlet 212. The fluid can be gas or glue of the heat-conducting structural glue 20. Before the heat-conducting structural glue 20 solidifies, the glue can flow in the state of liquid. The fluid outlet 212 can be one large opening or a plurality of small holes.

[0048] Each exhaust glue overflow channel 21 can have one fluid outlet 212, or two or more fluid outlets 212. Each exhaust glue overflow channel 21 can be independently arranged, or at least two exhaust glue overflow channels 21 can be connected.

[0049] The location of the fluid outlet 212 can be selected according to actual needs. In some embodiments, the fluid outlet 212 of the exhaust glue overflow channel 21 is located on at least one side of the end plate 2 along the Y direction. The Y direction is the width direction of the battery module 1. Figure 4 As shown, multiple exhaust and overflow glue channels 21 are provided, and multiple fluid outlets 212 are distributed on both sides of the end plate 2 along the Y direction. By arranging the fluid outlets 212 on the sides of the end plate 2 along the Y direction, it is possible to prevent the thermal conductive structural adhesive 20 from overflowing on the top of the end plate 2 and affecting the appearance. At the same time, the thermal conductive structural adhesive 20 overflowing on the sides can bond adjacent end plates 2 together, enhancing structural strength.

[0050] In some embodiments, the fluid outlet 212 of the exhaust and overflow glue channel 21 is located on a side of the end plate 2 away from the fluid inlet 211 along the Z direction. Figure 5 As shown, multiple degassing and glue overflow channels 21 are provided, and multiple fluid outlets 212 are distributed on one side of the end plate 2 along the Z direction away from the fluid inlet 211. In some embodiments, among the multiple degassing and glue overflow channels 21, some fluid outlets 212 are located on at least one side of the end plate 2 along the Y direction, and some fluid outlets 212 are located on the side of the end plate 2 along the Z direction away from the fluid inlet 211.

[0051] In some embodiments, the exhaust and overflow glue channel 21 extends in a straight line, and the airflow along the exhaust and overflow glue channel 21 flows more smoothly, with less airflow resistance, which facilitates rapid exhaust. Figure 5 As shown, the degassing and glue overflow channel 21 extends along the Z direction. Exemplarily, the fluid inlet 211 of the degassing and glue overflow channel 21 is located at one end of the end plate 2 along the Z direction close to the bottom surface of the battery box 10, and the fluid outlet 212 of the degassing and glue overflow channel 21 is located on at least one side of the end plate 2 along the Y direction, that is, the degassing and glue overflow channel 21 extends obliquely relative to the Z direction.

[0052] In some embodiments, at least part of the exhaust and overflow glue channel 21 extends in a zigzag manner to extend the path of the exhaust and overflow glue channel 21 and accommodate more overflowed thermal conductive structural adhesive 20. For example, Figure 4 As shown, at least part of the exhaust and glue overflow channel 21 extends along the Y direction, which is the width direction of the battery cell module 1. Figure 4 The illustrated venting and overflowing glue channel 21 extends in an L-shape. In other embodiments, the venting and overflowing glue channel 21 may also extend in an S-shape or other zigzag shape. The bending radius of the venting and overflowing glue channel 21 is greater than or equal to 10 mm. The larger bending radius prevents significant resistance to exhaust, ensures smoother glue overflow, and extends the path of the venting and overflowing glue channel 21 to accommodate more thermally conductive structural adhesive 20.

[0053] In the X direction, the end plate 2 has a first side 22 facing the battery cell module 1 and a second side 23 facing away from the battery cell module 1, and the first side 22 and / or the second side 23 is / are provided with the exhaust glue overflow channel 21. In some embodiments, the first side 22 is provided with the exhaust glue overflow channel 21, and during the boxing process, the battery cell module 1 is pressed against the heat-conducting structural glue 20, causing part of the heat-conducting structural glue 20 to overflow into the exhaust glue overflow channel 21, forming a glue overflow layer between the end plate 2 and the battery cell module 1, increasing the bonding area of the end plate 2 and the battery cell module 1, and increasing the overall stiffness. In some embodiments, the first side 22 and the second side 23 are both provided with the exhaust glue overflow channel 21, making full use of the surface area of the end plate 2, increasing the number of exhaust glue overflow channels 21, and improving the exhaust glue overflow efficiency. The end plate 2 does not need to be distinguished between front and back during installation, improving the assembly efficiency.

[0054] As shown in Figure 6 and Figure 7 The end plate 2 is provided with a guide groove 24, which forms a fluid inlet 211. In the direction of fluid entry, the flow area of the guide groove 24 gradually decreases. The guide groove 24 plays a guiding role for the fluid, guiding the gas and the heat-conducting structural glue 20 to quickly enter the exhaust glue overflow channel 21, avoiding the starting position of the exhaust glue overflow channel 21 being blocked by the heat-conducting structural glue 20 and affecting the exhaust, and improving the exhaust glue overflow efficiency.

[0055] The shape of the guide groove 24 can be triangular, sector, trapezoidal, etc., as long as the flow area of the guide groove 24 gradually decreases in the direction of fluid entry.

[0056] In some embodiments, downstream of the guide groove 24, the flow area of the exhaust glue overflow channel 21 is uniformly arranged in the direction of fluid flow, facilitating processing and production and reducing manufacturing costs. In some embodiments, downstream of the guide groove 24, the flow area of the exhaust glue overflow channel 21 gradually increases in the direction of fluid flow; or, downstream of the guide groove 24, the exhaust glue overflow channel 21 includes at least two sections of channels that are sequentially connected, and the flow area of the latter section of channel is greater than that of the former section of channel in the direction of fluid flow. The change in flow area forms a necked region inside the exhaust glue overflow channel 21, increases the gas flow rate, and facilitates rapid exhaust.

[0057] In the direction of fluid flow, the fluid enters the exhaust glue overflow channel 21 through the guide groove 24 and flows along the exhaust glue overflow channel 21 towards the fluid outlet 212. Downstream of the guide groove 24, i.e. in the region after the guide groove 24 in the direction of fluid flow, to the fluid outlet 212 of the exhaust glue overflow channel 21. Figure 6 and Figure 7 The direction of fluid flow is shown by the dashed arrows in

[0058] As shown in Figure 7As shown, the end plate 2 is provided with a guide slope 26 near the side of the bottom surface of the battery box 10, and the guide slope 26 is communicated with the fluid inlet 211 to guide the fluid to flow to the fluid inlet 211. The guide slope 26 plays a guiding role for the fluid to guide the gas and the heat-conducting structural adhesive 20 to quickly enter the fluid inlet 211, thereby improving the glue overflow efficiency of the exhaust.

[0059] The inclination angle of the guide slope 26 relative to the Z direction can be set according to actual needs, for example, the guide slope 26 is inclined by 30 degrees, 45 degrees or 60 degrees relative to the Z direction.

[0060] The guide slope 26 extends along the Y direction from one end of the end plate 2 to the other end of the end plate 2, so that the heat-conducting structural adhesive 20 at the bottom of the end plate 2 can be uniformly guided to the fluid inlet 211.

[0061] In some embodiments, at least part of the exhaust glue overflow channel 21 penetrates the end plate 2 along the thickness direction of the end plate 2, so that the heat-conducting structural adhesive 20 on one side of the end plate 2 can flow to the other side of the end plate 2, while quickly discharging the glue, the end plate 2 is fixed and the structural strength is increased.

[0062] In some embodiments, as shown in Figure 8 The end plate 2 is provided with a through hole 25, and the through hole 25 penetrates at least part of the exhaust glue overflow channel 21 along the X direction, and the through hole 25 is communicated with at least one exhaust glue overflow channel 21. The through hole 25 is provided, so that the heat-conducting structural adhesive 20 inside the exhaust glue overflow channel 21 can flow to the through hole 25, and flow from one side of the end plate 2 to the other side of the end plate 2 through the through hole 25, while quickly discharging the glue, the end plate 2 is fixed and the structural strength is increased.

[0063] Exemplarily, the through hole 25 is provided with a plurality of through holes, for part of the through holes 25, each through hole 25 is communicated with one exhaust glue overflow channel 21, for part of the through holes 25, each through hole 25 is communicated with two exhaust glue overflow channels 21, for part of the through holes 25, each through hole 25 is communicated with three exhaust glue overflow channels 21, which are not listed one by one.

[0064] The through hole 25 can extend in a straight line to facilitate processing and production, or can extend in a curve to increase the extension path and accommodate more heat-conducting structural adhesive 20. The through hole 25 can extend along the Z direction, or can extend along the Y direction, or can be provided at an angle with the Z direction.

[0065] As shown in Figure 2 , Figure 9 and Figure 10As shown, a plurality of heat-conducting structural adhesives 20 are arranged on the bottom surface of the battery box 10, and at least one fluid inlet 211 is arranged on the end plate 2 between each adjacent two heat-conducting structural adhesives 20. The plurality of heat-conducting structural adhesives 20 are arranged at intervals to ensure the bonding area and uniformity of the bottom of the cell module 1 and the bottom surface of the battery box 10, and at least one fluid inlet 211 is arranged between each adjacent two heat-conducting structural adhesives 20, so that when the glue overflows, the heat-conducting structural adhesive 20 can flow in the width direction thereof and flow into the fluid inlet 211, thereby shortening the glue overflow distance and ensuring that the heat-conducting structural adhesives 20 on both sides of the fluid inlet 211 can overflow uniformly to prevent the heat-conducting structural adhesive 20 from accumulating to cause uneven thickness and further cause uneven temperature of the cell module 1.

[0066] Exemplarily, the heat-conducting structural adhesive 20 extends along the X direction, and the plurality of heat-conducting structural adhesives 20 are arranged at intervals along the Y direction. The heat-conducting structural adhesive 20 is generally polyurethane system, silicone, gel, etc., and has certain structural bonding strength and heat-conducting capacity. Exemplarily, the bottom surface of the battery box 10 is provided with a water-cooling plate, and the heat-conducting structural adhesive 20 is arranged on the water-cooling plate to facilitate heat transfer between the cell module 1 and the water-cooling plate.

[0067] The width of the inlet end of the fluid inlet 211 is greater than or equal to the interval between the adjacent two heat-conducting structural adhesives 20. Figure 10 In the drawings, d2 represents the width of the inlet end of the fluid inlet 211, and d10 represents the interval between the adjacent two heat-conducting structural adhesives 20. d2 is greater than or equal to d10. The width of the inlet end of the fluid inlet 211 is relatively large, and the heat-conducting structural adhesive 20 can overflow more smoothly when the cell module 1 is put into the box, which further ensures the exhaust efficiency and effect and avoids local poor exhaust and the problem of still existing bubbles.

[0068] The end plate 2 is provided with a plurality of exhaust glue overflow channels 21 arranged at intervals along the Y direction. The width of the inlet end of each fluid inlet 211 can be the same or different, as long as the width of the inlet end of the fluid inlet 211 is greater than or equal to the interval between the heat-conducting structural adhesives 20 on both sides of the fluid inlet 211.

[0069] Figure 10 In the drawings, d9 represents the width of the heat-conducting structural adhesive 20, for example, 5 mm, 10 mm, etc.; and d1 represents the width of the end plate 2 along the Y direction, which corresponds to the number and interval of the heat-conducting structural adhesives 20 arranged on each end plate 2, and is determined comprehensively according to d1, d10 and d9.

[0070] As shown in the drawings, Figure 10 The plurality of exhaust glue overflow channels 21 are distributed on both sides of the middle region of the end plate 2. The fluid outlets 212 of the exhaust glue overflow channels 21 are distributed on both sides of the end plate 2 along the Y direction.

[0071] In the flow direction of the fluid, the flow area of each exhaust glue overflow channel 21 first decreases and then increases. For example, the exhaust glue overflow channel 21 includes a guide groove 24, a first channel and a second channel connected in sequence, the width of the first channel of each exhaust glue overflow channel 21 from the middle to the both ends is represented by d5, d4 and d3 respectively, the width of the second channel of each exhaust glue overflow channel 21 from the middle to the both ends is represented by d8, d7 and d6 respectively, d8>d5, d7>d4, d6>d3. The width d2 of the inlet end of the fluid inlet 211 is greater than d5, d2>d4, d2>d3, that is, the initial width is large, which is convenient for initial glue overflow, the middle part is provided with a necked zone to facilitate the rapid passage of gas, and the width of the end is widened to avoid poor exhaust.

[0072] In any two exhaust glue overflow channels 21, the flow area of the exhaust glue overflow channel 21 closer to the middle part of the end plate 2 is larger. For example, d5>d4>d3. Because the exhaust direction of the gas is from the inside to the outside, by setting the flow area of the exhaust glue overflow channel 21 closer to the middle part of the end plate 2 to be larger, the middle area of the battery cell module 1 is prevented from being gas-stopped and glue-stopped. In other embodiments, d5=d4=d3 can be set.

[0073] In any two exhaust glue overflow channels 21, the flow area of the exhaust glue overflow channel 21 with a longer extension path is larger than that of the exhaust glue overflow channel 21 with a shorter extension path, which is convenient for rapid glue discharge. For example, d8>d7>d6. In other embodiments, d8=d7=d6 can be set.

[0074] Figure 10 The height of the heat-conducting structural glue 20 is represented by h0, for example, 2-5 mm; the height of the end plate 2 is represented by h1, the distance between the lowest fluid outlet 212 and the bottom of the end plate 2 is represented by h2; the distance between the adjacent exhaust glue overflow channels 21 along the Z direction is represented by h3 and h4. The specific size of each parameter can be set according to actual needs.

[0075] Figure 10 R1 represents the bending radius of the bending part of the exhaust glue overflow channel 21, R1 is greater than or equal to 10 mm. In some embodiments, R1 is greater than or equal to 15 mm. In some embodiments, R1 is equal to 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm or 20 mm.

[0076] In some embodiments, the end plate 2 is an insulating piece. For example, the end plate 2 is made of plastic materials such as PC, nylon PA, ABS and the like, or a mixture of multiple components in a certain proportion, such as ABS+PC. The first side surface 22 of the end plate 2 facing the battery cell module 1 can be provided with double-sided adhesive tape to adhere to the battery cell module 1.

[0077] As shown in Figures 1 to 4 , Figures 11 to 13 , the battery box 10 includes a support beam 12, and the side of the end plate 2 away from the battery cell module 1 is connected with the support beam 12. The side of the support beam 12 facing the end plate 2 is provided with an auxiliary exhaust overflow glue channel 121, and the auxiliary exhaust overflow glue channel 121 has a fluid inlet 1211. The fluid inlet 1211 is in communication with the mounting cavity 11, or the fluid inlet 1211 is in communication with the exhaust overflow glue channel 21. When the battery module is put into the box, the auxiliary exhaust overflow glue channel 121 can exhaust the gas and accommodate the overflow of the heat-conducting structural glue 20, avoid the formation of a bubble cavity area between the battery cell module 1 and the battery box 10, and ensure the bonding strength and heat exchange effect.

[0078] Exemplarily, the fluid inlet 1211 is in communication with the mounting cavity 11, and the gas and overflow glue can enter the auxiliary exhaust overflow glue channel 121 through the mounting cavity 11 and the fluid inlet 1211. Exemplarily, the fluid inlet 1211 is in communication with the exhaust overflow glue channel 21, and the gas and overflow glue can enter the exhaust overflow glue channel 21 and then enter the auxiliary exhaust overflow glue channel 121 through the exhaust overflow glue channel 21.

[0079] By providing the auxiliary exhaust overflow glue channel 121 on the support beam 12, the overflow efficiency of the gas can be improved, and at the same time, the overflow of the heat-conducting structural glue 20 forms a glue overflow layer between the end plate 2 and the support beam 12, so that the end plate 2 is bonded with the support beam 12, the connection strength between the support beam 12 and the end plate 2 is increased, and the risk of deformation of the end plate 2 is reduced.

[0080] At the same time, the provision of the auxiliary exhaust overflow glue channel 121 can increase the heat insulation effect, avoid the support beam 12 from heating or excessively heating or cooling the battery cell module 1, and cause poor temperature difference consistency between the battery cell modules 1. The support beam 12 is usually made of metal material, such as aluminum series or sheet steel series material, and has a high thermal conductivity coefficient, such as an aluminum material with a thermal conductivity coefficient of more than 200. By providing the auxiliary exhaust overflow glue channel 121 on the support beam 12, the material is removed to form the auxiliary exhaust overflow glue channel 121, the heat exchange area between the support beam 12 and the battery cell module 1 is reduced, the heat-conducting structural glue 20 enters the auxiliary exhaust overflow glue channel 121 to form a glue layer, the thermal conductivity coefficient of the heat-conducting structural glue 20 is less than 1, the thermal conductivity coefficient is low, and the heat transfer is poor, so that the support beam 12 can avoid excessive heating or cooling of the battery cell module 1.

[0081] In some embodiments, the end plate 2 is a metal piece. The end plate 2 is fixedly connected with the battery box 10, and the battery cell module 1 is inserted between the two end plates 2 when put into the box, and the end plate 2 plays a role of a support beam to support the battery cell module 1.

[0082] In summary, the end plate 2 is provided with the exhaust overflow glue channel 21, and / or the support beam 12 is provided with the auxiliary exhaust overflow glue channel 121. During the process of the battery cell module 1 being put into the battery box 10, the exhaust overflow glue channel 21 and the auxiliary exhaust overflow glue channel 121 can play the roles of exhaust and overflow glue.

[0083] Exemplarily, the support beam 12 is provided with the auxiliary exhaust overflow glue channel 121, the fluid inlet 1211 of the auxiliary exhaust overflow glue channel 121 is communicated with the mounting cavity 11, and the auxiliary exhaust overflow glue channel 121 is configured to exhaust the gas in the heat-conducting structural glue 20 between the battery cell module 1 and the battery box 10 and contain the overflow heat-conducting structural glue 20 when the battery cell module 1 is put into the battery box 10.

[0084] The cross-sectional shape of the auxiliary exhaust overflow glue channel 121 can be U-shaped, V-shaped, trapezoidal, semicircular or rectangular. The auxiliary exhaust overflow glue channel 121 can exhaust alone, or at least part of the auxiliary exhaust overflow glue channel 121 can be communicated with the exhaust overflow glue channel 21 to exhaust by means of the fluid outlet 212 of the exhaust overflow glue channel 21.

[0085] Each auxiliary exhaust overflow glue channel 121 can have one fluid inlet 1211, or two or more fluid inlets 1211. The auxiliary exhaust overflow glue channels 121 can be independently arranged, or at least two auxiliary exhaust overflow glue channels 121 can be communicated.

[0086] In some embodiments, the auxiliary exhaust overflow glue channel 121 extends in a straight line, the gas flow is smoother along the auxiliary exhaust overflow glue channel 121, the gas flow resistance is small, and the rapid exhaust is facilitated. In some embodiments, at least part of the auxiliary exhaust overflow glue channel 121 extends in a zigzag manner to lengthen the path of the auxiliary exhaust overflow glue channel 121, so that more overflow heat-conducting structural glue 20 can be contained.

[0087] Exemplarily, the end plate 2 is provided with the exhaust overflow glue channel 21 towards the second side surface 23 of the support beam 12, and the support beam 12 is provided with the auxiliary exhaust overflow glue channel 121 towards the side surface of the end plate 2, and the auxiliary exhaust overflow glue channel 121 is communicated with the exhaust overflow glue channel 21 one by one.

[0088] The support beam 12 is provided with the guide port 122, the guide port 122 forms the fluid inlet 211, and the flow area of the guide port 122 gradually decreases along the entering direction of the fluid. The guide port 122 plays a guiding role for the fluid to guide the gas and the heat-conducting structural glue 20 to quickly enter the auxiliary exhaust overflow glue channel 121, so as to avoid the starting position of the auxiliary exhaust overflow glue channel 121 being blocked by the heat-conducting structural glue 20 and affecting the exhaust, and improve the exhaust and overflow glue efficiency.

[0089] The shape of the guide port 122 can be triangular, sector-shaped, trapezoidal, etc., as long as the flow area of the guide port 122 gradually decreases along the entering direction of the fluid.

[0090] In some embodiments, downstream of the guide port 122, the flow area of the auxiliary exhaust overflow channel 121 is uniformly arranged along the flow direction of the fluid, facilitating processing and production and reducing manufacturing costs. In some embodiments, downstream of the guide port 122, the flow area of the auxiliary exhaust overflow channel 121 gradually increases along the flow direction of the fluid; or, downstream of the guide port 122, the auxiliary exhaust overflow channel 121 includes at least two channels that are sequentially connected, and the flow area of the latter channel is greater than that of the former channel along the flow direction of the fluid. The change in flow area forms a necked region inside the auxiliary exhaust overflow channel 121, increases the gas flow rate, and facilitates rapid exhaust.

[0091] Wherein the fluid enters the auxiliary exhaust overflow channel 121 through the guide port 122 and flows along the auxiliary exhaust overflow channel 121, downstream of the guide port 122, i.e. the region after the guide port 122 along the flow direction of the fluid, to the end of the auxiliary exhaust overflow channel 121.

[0092] The support beam 12 is provided with a plurality of auxiliary exhaust overflow channels 121, and in any two auxiliary exhaust overflow channels 121, the flow area of the auxiliary exhaust overflow channel 121 with a longer extension path is greater than that of the auxiliary exhaust overflow channel 121 with a shorter extension path, facilitating rapid exhaust and overflow to prevent blockage.

[0093] The bottom surface of the battery box 10 is provided with a plurality of heat-conducting structural adhesives 20 at intervals, and the support beam 12 is provided with at least one fluid inlet 1211 between each adjacent two heat-conducting structural adhesives 20. The plurality of heat-conducting structural adhesives 20 are arranged at intervals to ensure the bonding area of the bottom of the cell module 1 and the heat-conducting structural adhesive 20, and at least one fluid inlet 1211 is arranged between each adjacent two heat-conducting structural adhesives 20 to allow the heat-conducting structural adhesive 20 to overflow uniformly to prevent accumulation of the heat-conducting structural adhesive 20 causing uneven thickness.

[0094] The width of the inlet end of the fluid inlet 1211 is greater than or equal to the distance between the adjacent two heat-conducting structural adhesives 20. The width of the inlet end of the fluid inlet 211 is larger, and the heat-conducting structural adhesive 20 overflows more smoothly when the cell module 1 is put into the box.

[0095] Along the flow direction of the fluid, the flow area of each auxiliary exhaust overflow channel 121 first decreases and then increases. That is, the initial width is large, facilitating initial overflow, the middle is provided with a necked region to facilitate rapid passage of gas, and the end width is widened to avoid poor exhaust.

[0096] 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 module, located in a battery box (10), comprising a battery cell module (1) and end plates (2) respectively arranged on both sides of a plurality of the battery cell modules (1) along the X direction, characterized in that: The end plate (2) is provided with an exhaust and glue overflow channel (21), and a fluid inlet (211) of the exhaust and glue overflow channel (21) is located at one end of the end plate (2) close to the bottom surface of the battery box (10) along the Z direction. The exhaust and glue overflow channel (21) is configured to discharge the gas in the thermal conductive structural adhesive (20) between the battery module (1) and the battery box (10) when the battery module (1) is placed in the box and to accommodate the overflowed thermal conductive structural adhesive (20); the X direction is the length direction of the battery module (1), and the Z direction is the height direction of the battery module (1).

2. The battery module according to claim 1, wherein: The exhaust and glue overflow channel (21) extends along the Z direction, or at least a portion of the exhaust and glue overflow channel (21) extends along the Y direction, and the Y direction is the width direction of the battery module (1); Along the X direction, the end plate (2) has a first side surface (22) facing the battery cell module (1) and a second side surface (23) facing away from the battery cell module (1), and the first side surface (22) and / or the second side surface (23) are provided with the exhaust glue overflow channel (21).

3. The battery module according to claim 2, characterized in that: The end plate (2) is provided with a plurality of the exhaust and glue overflow channels (21) arranged at intervals along the Y direction, and among any two of the exhaust and glue overflow channels (21), the exhaust and glue overflow channel (21) closer to the middle portion of the end plate (2) has a larger flow area; And / or, of any two of the exhaust and glue overflow channels (21), the flow area of ​​the exhaust and glue overflow channel (21) with the longer extension path is greater than the flow area of ​​the exhaust and glue overflow channel (21) with the shorter extension path.

4. The battery module according to claim 1, wherein: The end plate (2) is provided with a through hole (25), the through hole (25) penetrates at least a portion of the exhaust and glue overflow channel (21) along the X direction, and the through hole (25) is connected to at least one of the exhaust and glue overflow channels (21).

5. The battery module according to claim 1, wherein: The end plate (2) is provided with a guide groove (24), the guide groove (24) forming the fluid inlet (211), and the flow area of ​​the guide groove (24) gradually decreases along the inlet direction of the fluid; Downstream of the guide groove (24), the flow area of ​​the exhaust and glue overflow channel (21) gradually increases along the flow direction of the fluid; or, downstream of the guide groove (24), the exhaust and glue overflow channel (21) includes at least two sections of channels that are connected in sequence, and along the flow direction of the fluid, the flow area of ​​the latter section of the channel is larger than the flow area of ​​the former section of the channel.

6. The battery module according to claim 1, characterized in that: A guide slope (26) is provided on one side of the end plate (2) close to the bottom surface of the battery box (10); the guide slope (26) is in communication with the fluid inlet (211) to guide the fluid to flow toward the fluid inlet (211).

7. The battery module according to claim 1, characterized in that: A plurality of heat-conducting structural adhesives (20) are arranged at intervals on the bottom surface of the battery box (10), and at least one fluid inlet (211) is provided between each two adjacent heat-conducting structural adhesives (20) on the end plate (2); The width of the inlet end of the fluid inlet (211) is greater than or equal to the distance between two adjacent thermally conductive structural adhesives (20).

8. A battery pack, characterized in that: The invention comprises a battery box (10) having a mounting cavity (11) and a battery module according to any one of claims 1 to 7 located in the mounting cavity (11).

9. The battery pack according to claim 8, characterized in that: The battery box (10) comprises a support beam (12), a side of the end plate (2) away from the battery cell module (1) is connected to the support beam (12), and a side of the support beam (12) facing the end plate (2) is provided with an auxiliary exhaust and glue overflow channel (121), and the auxiliary exhaust and glue overflow channel (121) has a fluid inlet (1211); the fluid inlet (1211) is communicated with the installation cavity (11), or the fluid inlet (1211) is communicated with the exhaust and glue overflow channel (21).

10. The battery pack according to claim 9, characterized in that: The end plate (2) is an insulating member.

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