Battery pack

Abstract

The utility model discloses a battery pack. The battery pack comprises a battery assembly, a battery box, a convergence assembly and a battery management module, and the first cooling flow channel on the bottom wall, the battery core cooling flow channel and the cooling confluence flow channel of the confluence assembly form a path for cooling the battery monomers entering and exiting the battery assembly, so that the cooling of the battery monomers is realized. The first cooling flow channel is formed on the bottom wall, so that the cooling flow channel is prevented from being arranged in the accommodating space of the battery box, the internal space of the battery box is maximized, the energy density of a battery pack can be improved, and the number of structural parts of the battery box is reduced; a large amount of gas released during thermal runaway of the single batteries can enter the gas confluence flow channel of the confluence assembly and then is discharged out of the battery pack, so that safety accidents such as fire and explosion of the whole battery pack are avoided. And the cooling medium in the cooling confluence flow channel has a cooling effect on the gas in the gas confluence flow channel, so that the temperature of the gas is reduced, and the diffusion of thermal runaway is delayed.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery technical field especially, relates to a battery pack. BACKGROUND

[0002] The new energy lithium battery industry of our country develops rapidly, especially in the new energy automobile field and energy storage field, and the demand along with the development increases, and the market expects high rate charge and discharge of the battery, and it is well known that the temperature rise rate of the battery cell is extremely fast during high rate charge and discharge, and the temperature safety threshold can be reached in a short time.

[0003] However, when high rate charge and discharge causes thermal runaway of the single battery cell, it is difficult to avoid thermal diffusion. UTILITY MODEL CONTENT

[0004] The utility model provides a battery pack, and the battery pack includes a battery management module, a battery assembly, a battery box and a current collection assembly.

[0005] The battery assembly includes a plurality of battery monomers arranged along a first direction or / and a second direction, and an electric cell cooling flow channel is formed between adjacent battery monomers, and each battery monomer is electrically connected to the battery management module.

[0006] The battery box includes a box body and a box cover sealingly connected to an opening of the box body, the box body is provided with a first accommodating cavity and a second accommodating cavity, the battery management module is arranged in the second accommodating cavity, the battery assembly is arranged in the first accommodating cavity, and the bottom wall of the box body is internally provided with a first cooling flow channel, the first cooling flow channel is sealingly communicated with one end of the electric cell cooling flow channel, wherein one of the first direction and the second direction is the length direction of the battery box, and the other is the width direction of the battery box.

[0007] The current collection assembly is located between the battery assembly and the box cover, the current collection assembly is provided with a gas current collection flow channel and a cooling current collection flow channel, the gas current collection flow channel and the cooling current collection flow channel are independent of each other, the cooling current collection flow channel is sealingly communicated with the other end of the electric cell cooling flow channel, and the gas current collection flow channel is sealingly communicated with the explosion-proof valve of each battery monomer of the battery assembly.

[0008] As an implementation manner, the first cooling flow channel is provided with a plurality of first communication holes spaced apart along the length extension direction, each first communication hole is located in the region between adjacent battery monomers, and is in communication with the port of the corresponding electric cell cooling flow channel.

[0009] As an implementation manner, a plurality of first cooling flow channels are arranged side by side in the bottom wall,

[0010] The side wall of the box is provided with a second cooling flow channel, which is in communication with each of the first cooling flow channels, or the side wall of the box is provided with at least two second cooling flow channels, and at least part of the second cooling flow channels are connected with each of the first cooling flow channels one by one.

[0011] As an implementation manner, the cooling bus flow channel is provided with a plurality of first liquid holes spaced apart along the length extension direction thereof, each of the first liquid holes is located in the region between adjacent battery monomers, and is in communication with the port of the corresponding battery cell cooling flow channel.

[0012] As an implementation manner, the bus assembly comprises a bus body and two first flow guides, the bus body is provided with a plurality of cooling bus flow channels side by side, the first flow guide has a fourth cooling flow channel,

[0013] The two first flow guides are respectively arranged on the two sides of the bus body, so that each cooling bus flow channel is in communication with one fourth cooling flow channel at one port and another fourth cooling flow channel at another port.

[0014] As an implementation manner, the bus body is provided with a plurality of gas bus flow channels side by side, the gas bus flow channels are arranged alternately with the cooling bus flow channels,

[0015] The gas bus flow channel is provided with a plurality of first gas holes spaced apart along the length extension direction thereof, each of the first gas holes is in communication with the explosion-proof valve of the corresponding battery monomer.

[0016] As an implementation manner, at least one first partition plate is arranged in the battery box,

[0017] The first partition plate is provided with a first exhaust channel, and the first exhaust channel is in communication with each of the gas bus flow channels.

[0018] As an implementation manner, a plurality of third communication holes are arranged on the surface of the first partition plate facing the bus assembly, the third communication holes are in communication with the first exhaust channel,

[0019] The gas bus flow channel is further provided with a second gas hole, and the second gas hole is in communication with the third communication hole.

[0020] As an implementation manner, the battery assembly further comprises a partition piece located between adjacent two battery monomers, the partition piece comprises opposite and spaced first and second end portions, the first and second end portions are clamped between adjacent battery monomers to form the battery cell cooling flow channel, or the partition piece is provided with the battery cell cooling flow channel.

[0021] As an implementation manner, the partition further comprises a partition portion connecting the first end portion and the second end portion, and the partition portion divides the cell cooling flow channel into two cell sub-cooling flow channels.

[0022] The first cooling flow channel on the bottom wall, the cell cooling flow channel and the cooling busbar flow channel of the busbar assembly form a path for cooling the battery monomer into and out of the battery assembly, and the cooling of the battery monomer is realized. The bottom wall itself forms the first cooling flow channel, which avoids the cooling flow channel in the accommodating space of the battery box, maximizes the space inside the battery box, improves the energy density of the battery pack, reduces the number of structural parts of the battery box, and helps to improve the assembly efficiency of the battery box; When the battery monomer is in thermal runaway, a large amount of gas released can enter the gas busbar flow channel of the busbar assembly, and then be discharged to the outside of the battery pack, avoiding safety accidents such as fire and explosion of the whole battery pack. In addition, the cooling medium in the cooling busbar flow channel has a cooling effect on the gas in the gas busbar flow channel, so that the temperature of the gas decreases, the spread of thermal runaway is delayed, and the possibility of fire or even explosion of the battery pack is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0023] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments made with reference to the accompanying drawings:

[0024] Figure 1 A schematic diagram of a battery pack is provided for the embodiments of the present application;

[0025] Figure 2 An exploded schematic diagram of a battery pack is provided for the embodiments of the present application;

[0026] Figure 3 A partial exploded schematic diagram of a battery pack is provided for the embodiments of the present application;

[0027] Figure 4 is Figure 3 a partial enlarged schematic diagram;

[0028] Figure 5 A cross-sectional schematic diagram of a battery pack is provided for the embodiments of the present application;

[0029] Figure 6 A schematic diagram of a battery box is provided for the embodiments of the present application;

[0030] Figure 7 is Figure 6 an A-A direction cross-sectional view;

[0031] Figure 8 An exploded schematic diagram of a battery box is provided for the embodiments of the present application;

[0032] Figure 9A schematic view of a right side wall provided by the embodiment of the utility model;

[0033] Figure 10 A schematic view of a sub bottom wall provided by the embodiment of the utility model;

[0034] Figure 11 A schematic view of a current collection assembly provided by the embodiment of the utility model;

[0035] Figure 12 A bottom view schematic view of a current collection sub body provided by the embodiment of the utility model;

[0036] Figure 13 A left view of a sub current collection body provided by the embodiment of the utility model;

[0037] Figure 14 A schematic view between adjacent battery monomers provided by the embodiment of the utility model Figure 1 ;

[0038] Figure 15 A schematic view between adjacent battery monomers provided by the embodiment of the utility model Figure 2 ;

[0039] Battery box 10, box 11, cover 12, first containing cavity 101, second containing cavity 102;

[0040] Right side wall 111, liquid separation bending part 1111, second communication hole 1111a, gap 11111, first mounting hole 1112, second mounting hole 1113, second cooling flow channel a1, rear side wall 112, front side wall 113, left side wall 114, third mounting hole 1141;

[0041] Bottom wall 115, sub bottom wall 11501, first cooling flow channel a2, first hollow structure 1151, first communication hole 1152, first cooling flow channel port 1153, first partition plate 116, fourth hollow structure 1161, first exhaust channel b2, second communication hole 11611, second partition plate 117;

[0042] Battery assembly 20, battery monomer 21, explosion-proof valve 211, cell cooling flow channel 201, cell sub cooling flow channel 2011, partition 22, first end 221, second end 222, partition 223;

[0043] Sealing fixing piece 30, first sealing fixing piece 31, second sealing fixing piece 32, third sealing fixing piece 33;

[0044] The confluence assembly 40, the confluence body 41, the confluence sub-body 401, the second hollow structure 411, the cooling confluence flow channel a3, the third cooling flow channel 411, the first liquid hole 4111, the third hollow structure 412, the gas confluence flow channel b1, the first gas hole 4121, the second gas hole 4122, the first flow guide 42, the fourth cooling flow channel a4, the second flow guide 43, and the fifth cooling flow channel a5.

[0045] The first joint 51, the second joint 52, the pressure relief valve 53, and the adapter 54. DETAILED DESCRIPTION

[0046] The application will be further described below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are merely intended for the purpose of interpretation of the utility model and are not limiting of the utility model. In addition, it should be noted that only parts related to the utility model are shown in the drawings for the convenience of description.

[0047] It should be noted that the embodiments in the application and the features in the embodiments can be combined with each other without conflict. The application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0048] At least referring to Figures 1-15 As shown in the drawings, the utility model example provides a battery pack, which comprises a battery assembly 20, a battery box 10, and a confluence assembly 40.

[0049] The battery assembly 20 comprises a plurality of battery monomers 21 arranged along a first direction or / and a second direction, and an electric core cooling flow channel 201 is formed between adjacent battery monomers 21.

[0050] The battery box 10 comprises a box body 11 and a box cover 12 sealingly connected to an opening of the box body 11, and the battery assembly 20 is placed in the box body 11. The bottom wall 115 of the box body 11 is internally provided with a first cooling flow channel a2, and the first cooling flow channel a2 is sealingly communicated with one end of the electric core cooling flow channel 201. Among them, one of the first direction and the second direction is the length direction of the battery box 10, and the other is the width direction of the battery box 10.

[0051] The confluence assembly 40 is located between the battery assembly 20 and the box cover 12, and the confluence assembly 40 is provided with a gas confluence flow channel b1 and a cooling confluence flow channel a3, and the gas confluence flow channel b1 and the cooling confluence flow channel a3 are independent of each other. The cooling confluence flow channel a3 is sealingly communicated with the other end of the electric core cooling flow channel 201. The gas confluence flow channel b1 is sealingly communicated with the explosion-proof valve 211 of each battery monomer 21.

[0052] Among them, the battery monomer 21 can be a square battery, a soft package battery or a cylindrical battery, and the following embodiments are described by taking the battery monomer 21 as a square battery.

[0053] Multiple battery cells 21 can be arranged in a rectangular array, such as Figure 3 As shown, multiple battery cells 21 are arranged in columns along the length of the battery box 10, and four columns are arranged side by side along the width of the battery box 10 to form the rectangular array described above.

[0054] In each column, a cell cooling channel 201 is provided between any two adjacent battery cells 21. The cell cooling channel 201 is used for heat transfer with the battery cell 21. For example, Figure 14 and Figure 15 As shown, the battery assembly 20 also includes a separator 22, which is sandwiched between two adjacent battery cells 21. The separator 22 includes a first end 221 and a second end 222 that are opposite to each other and spaced apart. The first end 221 and the second end 222 are sandwiched between the opposite surfaces of the adjacent battery cells 21. The first end 221, the second end 222 and the opposite surfaces of the two battery cells 21 form the aforementioned cell cooling channel 201.

[0055] Of course, it is understandable that if the separator 22 itself is a cavity structure, the separator 22 will be provided with the aforementioned cell cooling channel 201.

[0056] With this configuration, the battery cell 21 itself becomes part of the cell cooling channel 201, allowing the cooling medium in the cell cooling channel 201 to directly contact the outer surface of the battery cell 21, forming direct cooling. In other words, as... Figure 3 As shown, the battery cell 21 is immersed in the cooling medium in the cell cooling channels 201 on the left and right sides, which is equivalent to an immersion cell cooling structure. There is no need to use a separate cooling plate to cooperate with the battery cell 21. This not only makes the heat transfer efficiency higher and is suitable for high-rate charging and discharging scenarios, but also reduces the number of structural components in the battery pack 20 and increases the energy density of the battery pack.

[0057] In addition, such as Figure 14 and Figure 15 As shown, the separator 22 also includes a separator 223 connecting the first end 221 and the second end 222. The separator 223 divides the cell cooling channel 201 into two cell sub-cooling channels 2011. The separator 223 can divide the cell cooling channel 201 equally or unequally. With this configuration, when one of two adjacent battery cells 21 experiences thermal runaway, the separator 23 can prevent the thermally runaway battery cell 21 from affecting the other battery cell 21, thus suppressing the spread of thermal runaway.

[0058] It should be noted that the first end 221, the second end 222 and the partition 223 may be integrally formed, and the partition 22 may be injection molded using high-temperature resistant insulating material, but is not limited to.

[0059] likeFigure 3 As shown, the box 11 has a receiving cavity, which includes a first receiving cavity 101 for placing the battery assembly 20 and a second receiving cavity 102 for placing the battery management module. Each battery monomer 21 is electrically connected with the battery management module.

[0060] In specific embodiments, as shown in Figure 6 and Figure 8 , the box 11 includes a bottom wall 115 and a plurality of side walls arranged around the bottom wall 115. The side walls and the bottom wall 115 are welded to be connected, so that the connection position of the side walls and the bottom wall 115 has good sealing performance. The plurality of side walls includes a left side wall 114, a rear side wall 112, a right side wall 111 and a front side wall 113. The bottom wall 115, the left side wall 114, the rear side wall 112, the right side wall 111 and the front side wall 113 can be but are not limited to hollow aluminum profiles, so as to reduce the weight of the entire box 11. Considering the processing technology of the bottom wall 115, in order to reduce the processing difficulty and processing cost of the bottom wall 115. The bottom wall 115 is spliced and welded by a plurality of sub-bottom walls 11501.

[0061] As shown in Figure 6 and Figure 8 , a second partition plate 117 is arranged in the box 11. The second partition plate 117 is arranged along the width direction of the battery box 10. The second partition plate 117 divides the receiving cavity into the first receiving cavity 101 and the second receiving cavity 102 which are independent of each other.

[0062] As shown in Figure 6 , Figure 8 and Figure 10 , since the sub-bottom wall 11501 is a hollow aluminum profile, a plurality of first hollow structures 1151 are arranged inside the sub-bottom wall 11501. One of the first hollow structures 1151 in the sub-bottom wall 11501 is taken as a first cooling flow channel a2, which extends along the length direction of the battery box 10. A plurality of first communication holes 1152 are arranged on the surface of the sub-bottom wall 11501 which contacts with the battery assembly 20. Each first communication hole 1152 is arranged equidistantly along the length direction of the first cooling flow channel a2. Each first communication hole 1152 is in communication with the first cooling flow channel a2. The first communication hole 1152 is located in the region between two adjacent battery monomers 21, that is, the first communication hole 1152 is in communication with the lower port of the corresponding cell cooling flow channel 201. Figure 6 and Figure 7 , so that the cooling medium in the first cooling flow channel a2 can enter the cell cooling flow channel 201 of the battery assembly 20, so as to realize heat transfer between the cooling medium and the battery monomer 21.

[0063] It should be noted that the bottom wall 115 itself forms the first cooling flow channel a2, avoiding the need to provide a cooling flow channel in the first accommodating cavity 101, which maximizes the internal space of the battery box 10, improves the energy density of the battery pack, reduces the number of structural components of the battery box 10, and helps to improve the assembly efficiency of the battery box 10.

[0064] As shown in Figure 11 and Figure 12 The bus assembly 40 can be but is not limited to a plate shape. The bus assembly 40 is located above the battery assembly 20, the bus assembly 40 is orthographically projected on the battery assembly 20, and the projection of the bus assembly 40 covers at least the battery assembly 20. The bus assembly 40 is provided with a gas bus flow channel b1 and a cooling bus flow channel a3, which are independent of each other. The gas bus flow channel b1 and the cooling bus flow channel a3 both extend along the width direction of the battery box 10,

[0065] As shown in Figure 12 The cooling bus flow channel a3 is provided with a plurality of first liquid holes 4111 arranged at equal intervals along the length direction thereof, and each first liquid hole 4111 is in communication with the cooling bus flow channel a3. Each first liquid hole 4111 is located in the region between two adjacent battery monomers 21, i.e., the first liquid hole 4111 is in communication with the upper port of the corresponding cell cooling flow channel 201. Thus, the cooling medium in the cell cooling flow channel 201 can enter the cooling bus flow channel a3, achieving the discharge of the cooling medium from the battery assembly 20.

[0066] The gas bus flow channel b1 is provided with a plurality of first gas holes 4121 arranged at equal intervals along the length direction thereof, and each first gas hole 4121 is in communication with the gas bus flow channel b1. The first gas hole 4121 is arranged in correspondence with the explosion-proof valve 211 of the battery monomer 21, and the two are in communication. Thus, a large amount of gas released when the battery monomer 21 is in thermal runaway can enter the gas bus flow channel b1 and then be discharged to the outside of the battery pack, avoiding safety accidents such as fire and explosion of the entire battery pack. At the same time, since the explosion-proof valve 211 of each battery monomer 21 is in communication with the gas bus flow channel b1, when a certain battery monomer 21 is in thermal runaway, the gas discharged by the battery monomer 21 will not affect other battery monomers 21, nor will it come into contact with the cooling medium, achieving directional exhaust of the battery monomer 21 in thermal runaway.

[0067] In summary, the first cooling flow channel a2 on the bottom wall 115, the cell cooling flow channel 201, and the cooling bus flow channel a3 of the bus assembly 40 form a path for cooling the battery monomer 21 into and out of the battery assembly 20, and achieve cooling of the battery monomer 21. The bottom wall 115 itself forms the first cooling flow channel a2, avoiding the need to provide a cooling flow channel in the accommodation space of the battery box 10, which maximizes the space inside the battery box 10, improves the energy density of the battery pack, reduces the number of structural components of the battery box 10, and helps improve the assembly efficiency of the battery box 10; a large amount of gas released when the battery monomer 21 experiences thermal runaway can enter the gas bus flow channel b1 of the bus assembly 40 and then be discharged to the outside of the battery pack, avoiding safety accidents such as fire and explosion of the entire battery pack. In addition, the cooling medium in the cooling bus flow channel a3 has a cooling effect on the gas in the gas bus flow channel b1, which reduces the temperature of the gas, delays the spread of thermal runaway, and reduces the possibility of fire or even explosion of the battery pack.

[0068] As an implementation manner, a plurality of first cooling flow channels a2 are arranged side by side in the bottom wall 115. The side wall of the box body 11 is provided with a second cooling flow channel a1, and the second cooling flow channel a1 and each first cooling flow channel a2 are in communication.

[0069] In a specific embodiment, as shown in Figure 6 , Figure 8 and Figure 9 , the four first cooling flow channels a2 on the bottom wall 115 are arranged side by side in the front-rear direction. A distribution bending part 1111 is protrudingly arranged on the inner surface of the right side wall 111, that is, the distribution bending part 1111 is located in the first accommodation cavity 101. The cross section of the distribution bending part 1111 can be L-shaped. The distribution bending part 1111 extends in the front-rear direction, and the front end of the distribution bending part 1111 is welded to the front side wall 113; the rear end of the distribution bending part 1111 is welded to the rear side wall 112. In this way, the distribution bending part 1111 and the inner surface of the right side wall 111 form an open downward long groove, and the opening of the groove is welded to the bottom wall 115, thereby forming the second cooling flow channel a1.

[0070] In the structure in which the second cooling flow channel a1 and each first cooling flow channel a2 are in communication, the second cooling flow channel a1 has a second communication hole 1111a extending along the length direction of the right side wall, and the cross section of the second communication hole 1111a is rectangular. The length of the second communication hole 1111a is equal to the length of the distribution bending part 1111. In the orthographic projection of the bottom wall 115, each first cooling flow channel a2 has a port 1153 located in the projection range of the second communication hole 1111a, and the port 1153 is in communication with the second communication hole 1111a. In this way, as shown in Figure 5 and Figure 7As shown, each first cooling flow channel a2 can enter the cooling medium based on the second cooling flow channel a1 at the same time, so that each battery cell 21 in each region of the battery module 20 is cooled, and the temperature of each battery cell 21 is substantially the same.

[0071] Of course, it can be understood that in some embodiments, at least two second cooling flow channels a1 can be provided on the side wall of the box 11, and at least part of the second cooling flow channels a1 are connected in one-to-one correspondence with each first cooling flow channel a2.

[0072] In addition, as shown in Figure 8 and Figure 9 An opening 11111 is formed at the top of the distribution bending part 1111, and a first mounting hole 1112 is formed on the right side wall 111. The adapter 54 passes through the first mounting hole 1112, and the adapter 54 is fixedly connected to the first mounting hole 1112. One end of the adapter 54 communicates with the opening 1112, and the other end communicates with the first joint 51. The first joint 51 can be a joint for introducing the cooling medium, and the cooling medium is introduced from the first joint 51 and dispersed into each first cooling flow channel a2 through the second cooling flow channel a1.

[0073] As an implementation manner, the cooling manifold flow channel a3 is provided with a plurality of first liquid holes 4111 spaced apart along the length extension direction thereof, each first liquid hole 4111 is located in a region between adjacent battery cells 21, and communicates with a port of the corresponding cell cooling flow channel 201.

[0074] In a specific embodiment, as shown in Figures 11-13 The manifold assembly 40 includes a manifold body 41, two first flow guides 42, and a second flow guide 43. The manifold body 41 is plate-shaped and includes a plurality of manifold sub-bodies 401, which can be but are not limited to hollow aluminum profiles, and the manifold sub-bodies 401 are spliced and welded to form the manifold body 41.

[0075] Figure 13 As shown, the manifold sub-body 401 is provided with a plurality of second hollow structures 411 and a plurality of third hollow structures 412, one second hollow structure 411 is a cooling manifold flow channel a3, and one third hollow structure 412 is a gas manifold flow channel b1. The cooling manifold flow channel a3 and the gas manifold flow channel b1 are alternately arranged in the length direction of the battery box 10. In this way, the cooling medium in the cooling manifold flow channel a3 has a cooling effect on the gas in the gas manifold flow channel b1, so that the temperature of the gas decreases, the spread of thermal runaway is delayed, and the possibility of fire or even explosion of the battery pack is reduced.

[0076] As shown in Figure 12As shown, the cooling manifold a3 is provided with a plurality of first liquid holes 4111 at equal intervals along the length direction of the cooling manifold a3, each first liquid hole 4111 is located in the region between adjacent battery monomers 21, and is in communication with the upper port of the corresponding cell cooling flow channel 201. Thus, the cooling medium which completes heat transfer with the battery assembly 20 can be discharged in time.

[0077] As shown in FIG. 6, the first flow guide 42 has a fourth cooling flow channel a4, the length direction of the first flow guide 42 is parallel to the length direction of the manifold body 41, and two first flow guides 42 are respectively arranged on the front and back sides of the manifold body 41. Figure 12 As shown, the gas manifold b1 is provided with a plurality of first gas holes 4121 at equal intervals along the length direction of the gas manifold b1, each first gas hole 4121 is in communication with the explosion-proof valve 211 of the corresponding battery monomer 21.

[0078] As shown in FIG. 6, the first flow guide 42 has a fourth cooling flow channel a4, the length direction of the first flow guide 42 is parallel to the length direction of the manifold body 41, and two first flow guides 42 are respectively arranged on the front and back sides of the manifold body 41. Figure 11 As shown in FIG. 6, the first flow guide 42 has a fourth cooling flow channel a4, the length direction of the first flow guide 42 is parallel to the length direction of the manifold body 41, and two first flow guides 42 are respectively arranged on the front and back sides of the manifold body 41.

[0079] The second flow guide 43 has a fifth cooling flow channel a5, the length direction of the second flow guide 43 is parallel to the width direction of the manifold body 41, and the second flow guide 43 is located on the right side of the manifold body 41. The two ports of the fifth cooling flow channel a5 of the second flow guide 43 are respectively in communication with the fourth cooling flow channels a4 of the two first flow guides 42.

[0080] As shown in FIG. 6, the first flow guide 42 has a fourth cooling flow channel a4, the length direction of the first flow guide 42 is parallel to the length direction of the manifold body 41, and two first flow guides 42 are respectively arranged on the front and back sides of the manifold body 41. Figure 8 and Figure 11 As shown in FIG. 6, the first flow guide 42 has a fourth cooling flow channel a4, the length direction of the first flow guide 42 is parallel to the length direction of the manifold body 41, and two first flow guides 42 are respectively arranged on the front and back sides of the manifold body 41.

[0081] Of course, it can be understood that the second joint 52 can also be used as a cooling medium inlet joint, and correspondingly, the first joint 51 can be used as a cooling medium outlet joint.

[0082] In practical applications, the operating temperature of the battery cell 21 affects its service life, and the battery cell 21 is not suitable for operation under high or low temperature conditions. Based on this, the first connector 5151 and the second connector 5252 are respectively connected to the thermal management unit, which is used to regulate the flow rate of the cooling medium so that the battery cell 21 is at a suitable operating temperature.

[0083] For example, the BMS monitors the temperature of the individual battery cells 21 inside the battery pack in real time and can transmit the data to the thermal management unit in real time. Based on the feedback data from the BMS, the thermal management unit starts controlling the heating or cooling cycle, and can control the flow rate of the cooling medium during the cycle to ensure that the individual battery cells 21 are in optimal working condition, thereby improving the service life of the individual battery cells 21. The control strategy is as follows:

[0084] When the temperature of battery cell 21 is ≤15℃, it is determined that battery cell 21 is in a low temperature condition. At this time, the temperature of battery cell 21 should be increased, so the heating cycle is turned on. Different cooling medium flow rates are configured for different battery cell 21 temperatures. For example, when the temperature is ≤10℃, the cooling medium flow rate is 10L / min, and when the temperature is ≤5℃, the cooling medium flow rate is 20L / min.

[0085] When the temperature of battery cell 21 is ≥40℃, it is determined that battery cell 21 is in a high-temperature condition. At this time, the temperature of battery cell 21 should be reduced, so the cooling cycle is turned on. The flow rate of the cooling medium is controlled according to the temperature of battery cell 21. For example, when the temperature is ≥45℃, the flow rate of the cooling medium is 10L / min, and when the temperature is ≥50℃, the flow rate of the cooling medium is 20L / min.

[0086] When the battery cell 21 triggers thermal runaway, the battery cell 21 will reach a high temperature of several hundred degrees Celsius. It can be set that when the temperature of the battery cell 21 is ≥100℃, it is determined that the battery cell 21 has triggered thermal runaway. At this time, the flow rate of the cooling medium should be adjusted to the maximum speed, such as 30L / min or 50L / min.

[0087] Optionally, in one embodiment, the battery box 10 includes an exhaust device (not shown). The exhaust device may pass through the box body 11 and be mounted on the box body 11, or pass through the box cover 12 and be mounted on the box cover 12. The exhaust device is connected to each gas confluence channel b1, and the exhaust device discharges gas outside the battery box 10, thereby avoiding safety accidents such as fire or explosion of the battery pack as a whole.

[0088] Optionally, in another embodiment, the battery box 10 is provided with at least one first partition plate 116, and the first partition plate 116 is provided with a first exhaust channel b2, which is connected to each gas confluence channel b1.

[0089] In detail, such as Figure 6As shown in the drawings, the battery box 10 is provided with a first partition plate 116, the length of the first partition plate 116 is arranged along the length direction of the battery box 10, the first partition plate 116 divides the second accommodating cavity 102 into independent second sub-accommodating chambers, and the first partition plate 116 divides the first accommodating cavity 101 into independent first sub-accommodating chambers. For example, the first partition plate 116 divides the first accommodating cavity 101 into two independent first sub-accommodating chambers, when the battery monomer 21 in the first sub-accommodating chamber on the front side occurs thermal runaway, the first partition plate 116 can play a blocking role to avoid the battery monomer 21 in the first sub-accommodating chamber on the rear side from being affected.

[0090] As shown in the drawings, Figure 5 and Figure 6 the first partition plate 116 can be but is not limited to a hollow aluminum profile, the first partition plate 116 is provided with a plurality of fourth hollow structures 1161, one fourth hollow structure 1161 as a first exhaust channel b2. A plurality of third communication holes 11611 are arranged on the surface of the first partition plate 116 facing the busbar assembly 40, each third communication hole 11611 is in communication with the first exhaust channel b2, and each third communication hole 11611 is arranged at equal intervals along the length direction of the first partition plate 116.

[0091] Each gas bus flow channel b1 is also provided with a second gas hole 4122, the second gas hole 4122 is located at the middle of the length direction of the gas bus flow channel b1. The second gas hole 4122 is in communication with the third communication hole 11611, as shown in the drawings. Figure 5 In this way, the gas in the busbar assembly 40 can enter the inside of the first partition plate 116 from the second gas hole 4122 and the third communication hole 11611, realizing the timely discharge of the gas in the busbar assembly 40.

[0092] As shown in the drawings, Figure 5 , Figure 8 and Figure 9 the second mounting hole 1113 is arranged on the right side wall 111. The pressure relief valve 53 communicates with the first exhaust channel b2 through the second mounting hole 1113, and the pressure relief valve 53 is mounted on the right side wall 111. The gas is discharged from the battery pack through the pressure relief valve 53.

[0093] As an implementation manner, the battery pack further comprises a sealing fixing member 30, which can be but is not limited to sealing glue. The sealing fixing member 30 comprises a first sealing fixing member 31, a second sealing fixing member 32 and a third sealing fixing member 33.

[0094] As shown in the drawings, Figure 3 , Figure 4As shown, the first sealing fixing member 31 is clamped between the battery assembly 20 and the bottom wall 115 of the box body 11, so that the first cooling flow channel a2 is in sealed communication with the lower port of the cell cooling flow channel 201; the second sealing fixing member 32 is clamped between the battery assembly 20 and the bus assembly 40, so that the first cooling flow channel a2 is in sealed communication with the upper port of the cell cooling flow channel 201; and the third sealing fixing member 33 is clamped between the first partition plate 116 and the bus assembly 40, so that the gas bus flow channel b1 is in sealed communication with the explosion-proof valve 211 of the battery monomer 21.

[0095] The sealing fixing member 30 is provided, on one hand, to play a sealing role to prevent gas or cooling medium from entering the first containing cavity 101, and on the other hand, to fix the battery monomer 21, so that the battery monomers 21 are arranged in an array, thereby avoiding the use of the CTP grouping mode to stack the battery monomers 21, reducing the number of parts, and lowering the manufacturing cost.

[0096] The utility model example further provides a kind of battery pack thermal management device, which comprises thermal management unit and above-mentioned battery pack, and the temperature of battery pack is adjusted by adjusting the cooling medium flow rate in the first cooling flow channel a2 of battery pack and cell cooling flow channel 201 by thermal management unit.Battery pack thermal management device has the advantages of above-mentioned battery pack, so it is not described again.

[0097] It should be understood that the above-mentioned terms such as "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only used for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the devices or elements referred to must have a specific orientation, structure and operation, therefore cannot be understood as limiting the utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first" and "second" can be explicitly or implicitly included one or more features. In the description of the utility model, unless otherwise stated, "a plurality of" means two or more.

[0098] The above description is only the preferred embodiment of the present application and the explanation of the technical principles applied. Those skilled in the art should understand that the utility model range involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, and also covers other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the utility model concept. For example, the technical solutions formed by replacing the above-mentioned features with the technical features disclosed in the present application (but not limited to) having similar functions.

Claims

1. A battery pack, characterized by, The battery pack comprises: a battery management module; a battery assembly (20) comprising a plurality of battery monomers (21) arranged along a first direction or / and a second direction, an electrode cooling flow channel (201) being formed between adjacent battery monomers (21), and each battery monomer (21) being electrically connected with the battery management module; a battery box (10) comprising a box body (11) and a box cover (12) sealingly connected to an opening of the box body (11), the box body (11) being provided with a first accommodating cavity (101) and a second accommodating cavity (102), the battery management module being arranged in the second accommodating cavity (102), and the battery assembly (20) being arranged in the first accommodating cavity (101), an inner bottom wall (115) of the box body (11) being provided with a first cooling flow channel (a2), the first cooling flow channel (a2) being sealingly communicated with one end of the electrode cooling flow channel (201), wherein one of the first direction and the second direction is a length direction of the battery box (10), and the other is a width direction of the battery box (10); a current collection assembly (40) located between the battery assembly (20) and the box cover (12), the current collection assembly (40) being provided with a gas current collection flow channel (b1) and a cooling current collection flow channel (a3), the gas current collection flow channel (b1) and the cooling current collection flow channel (a3) being independent of each other, and the cooling current collection flow channel (a3) being sealingly communicated with the other end of the electrode cooling flow channel (201); the gas current collection flow channel (b1) being sealingly communicated with the explosion-proof valve (211) of each battery monomer (21) of the battery assembly (20).

2. The battery pack according to claim 1, wherein: a plurality of first communication holes (1152) are arranged at intervals along the length extension direction of the first cooling flow channel (a2), each first communication hole (1152) is located in the region between adjacent battery monomers (21), and is communicated with the port of the corresponding electrode cooling flow channel (201).

3. The battery pack of claim 2, wherein, a plurality of first cooling flow channels (a2) are arranged side by side in the bottom wall (115), a second cooling flow channel (a1) is arranged on the side wall of the box body (11), the second cooling flow channel (a1) is respectively communicated with each first cooling flow channel (a2), or at least two second cooling flow channels (a1) are arranged on the side wall of the box body (11), and at least part of the second cooling flow channels (a1) are connected one by one with each first cooling flow channel (a2).

4. The battery pack according to any one of claims 1-3, wherein: a plurality of first liquid holes (4111) are arranged at intervals along the length extension direction of the cooling current collection flow channel (a3), each first liquid hole (4111) is located in the region between adjacent battery monomers (21), and is communicated with the port of the corresponding electrode cooling flow channel (201).

5. The battery pack of claim 4, wherein, The current collection assembly (40) comprises a current collection body (41) and two first flow guides (42), a plurality of cooling current collection channels (a3) are arranged side by side in the current collection body (41), the first flow guide (42) has a fourth cooling channel (a4), The two first flow guides (42) are arranged on both sides of the current collection body (41) respectively, so that each cooling current collection channel (a3) is in communication with one fourth cooling channel (a4) at one end and another fourth cooling channel (a4) at the other end.

6. The battery pack of claim 5, wherein, A plurality of gas current collection channels (b1) are arranged side by side in the current collection body (41), and the gas current collection channels (b1) are arranged alternately with the cooling current collection channels (a3), The gas current collection channel (b1) is provided with a plurality of first gas holes (4121) arranged at intervals along the length extension direction thereof, and each first gas hole (4121) is in communication with the explosion-proof valve (211) of the corresponding battery monomer (21).

7. The battery pack of claim 6, wherein, At least one first partition plate (116) is arranged in the battery box (10), The first partition plate (116) is provided with a first exhaust channel (b2) therein, and the first exhaust channel (b2) is in communication with each gas current collection channel (b1).

8. The battery pack of claim 7, wherein, A plurality of third communication holes (11611) are arranged on the surface of the first partition plate (116) facing the current collection assembly (40), and each third communication hole (11611) is in communication with the first exhaust channel (b2), The gas current collection channel (b1) is further provided with a second gas hole (4122), and the second gas hole (4122) is in communication with the third communication hole (11611) correspondingly.

9. The battery pack of any one of claims 1-3, wherein the battery assembly (20) further comprises a separator (22) arranged between adjacent two battery monomers (21), The separator (22) comprises opposite and spaced first and second end portions (221, 222), and the first and second end portions (221, 222) are arranged between the adjacent battery monomers (21) to form the cell cooling channel (201), or the separator (22) is provided with the cell cooling channel (201).

10. The battery pack of claim 9, wherein, The separator (22) further comprises a separation portion (223) connecting the first and second end portions (221, 222), and the separation portion (223) divides the cell cooling channel (201) into two cell sub-cooling channels (2011).

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