Battery pack and battery pack heat management device

Abstract

The utility model discloses a battery pack and a battery pack heat management device. The battery pack comprises a battery assembly, a battery box, a confluence assembly and a sealing fixing piece. 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 generally, especially a kind of battery pack and battery pack thermal management device. BACKGROUND

[0002] China's new energy lithium battery industry develops rapidly, especially in new energy vehicle field and energy storage field, it is making rapid progress. With the development of demand also increases, the current market to battery high rate charge and discharge expectation increases, as is known, temperature rise rate is extremely fast when cell high rate charge and discharge, can reach temperature safety threshold in short time.

[0003] However, when high rate charge and discharge triggers single cell thermal runaway, it is difficult to avoid heat diffusion. How to consider the design of thermal management system and heat discharge system becomes the difficulty of battery pack. UTILITY MODEL CONTENT

[0004] The utility model provides a kind of battery pack, battery pack includes battery assembly, battery box, confluence assembly and sealing fixing piece.

[0005] The battery assembly includes a plurality of battery monomers arranged along a first direction, and / or a second direction, and an electric cell cooling flow channel is formed between adjacent battery monomers, 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.

[0006] The battery box includes a box body and a box cover sealed to the opening of the box body, the battery assembly is placed in the box body, and a first cooling flow channel is provided in the inner bottom wall of the box body, and the first cooling flow channel is communicated with one end of the electric cell cooling flow channel.

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

[0008] A sealing fixing piece is provided between the battery assembly and the bottom wall of the box body, or / and, the sealing fixing piece is provided between the battery assembly and the confluence assembly.

[0009] As an implementation manner, the confluence assembly includes a confluence body, a plurality of gas confluence flow channels are provided side by side in the confluence body, and a plurality of first gas holes are arranged at intervals along the length extension direction of the gas confluence flow channel, and each first gas hole is communicated with the explosion-proof valve of the corresponding battery monomer.

[0010] As an implementation manner, an exhaust member passing through the battery box is further included, the exhaust member is in communication with the gas collecting flow channel, and the exhaust member is used for discharging the gas out of the battery box.

[0011] As an implementation manner, at least one first partition plate is arranged in the battery box,

[0012] The first partition plate is provided with a first exhaust channel, and the first exhaust channel is in communication with each gas collecting flow channel.

[0013] As an implementation manner, a plurality of third communication holes are arranged on the surface of the first partition plate towards the collecting assembly, each third communication hole is in communication with the first exhaust channel, and each gas collecting flow channel is further provided with at least one second gas hole, and the second gas hole is in communication with the third communication hole in correspondence.

[0014] As an implementation manner, the second gas hole is located at the middle of the length direction of the gas collecting flow channel.

[0015] As an implementation manner, a pressure relief valve in communication with the first exhaust channel is further included.

[0016] As an implementation manner, the box body includes a first accommodating cavity in which the battery assembly is arranged, and the first partition plate divides the first accommodating cavity into first sub-accommodating cavities independent of each other.

[0017] As an implementation manner, the sealing fixing member includes a third sealing fixing member clamped between the collecting assembly and the first partition plate, so that the gas collecting flow channel is in sealed communication with the explosion-proof valve of each battery monomer.

[0018] The utility model further provides a kind of battery pack thermal management device, including thermal management unit and above-mentioned battery pack, the thermal management unit passes through adjusting the cooling medium flow rate in the first cooling flow channel of the battery pack, cell cooling flow channel, to adjust the temperature of the battery pack.

[0019] The above scheme, through the first cooling flow channel on the bottom wall, the cell cooling flow channel and the cooling busbar flow channel of the busbar assembly, the paths of the battery assembly into and out of the cooling battery monomer are formed, and the cooling of the battery monomer is realized. The first cooling flow channel is formed by the bottom wall itself, which avoids the cooling flow channel in the accommodation 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 by the battery monomer can enter the gas busbar flow channel of the busbar assembly, and then be discharged to the outside of the battery pack, avoiding the 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 is reduced, the spread of thermal runaway is delayed, and the possibility of fire or explosion of the battery pack is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0020] 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:

[0021] Figure 1 A schematic view of a battery pack provided by the embodiments of the present application is shown in the figure;

[0022] Figure 2 An exploded schematic view of a battery pack provided by the embodiments of the present application is shown in the figure;

[0023] Figure 3 A partial exploded schematic view of a battery pack provided by the embodiments of the present application is shown in the figure;

[0024] Figure 4 A partial enlarged schematic view of Figure 3 is shown in the figure;

[0025] Figure 5 A cross-sectional schematic view of a battery pack provided by the embodiments of the present application is shown in the figure;

[0026] Figure 6 A schematic view of a battery box provided by the embodiments of the present application is shown in the figure;

[0027] Figure 7 A cross-sectional view of Figure 6 in the A-A direction is shown in the figure;

[0028] Figure 8 An exploded schematic view of a battery box provided by the embodiments of the present application is shown in the figure;

[0029] Figure 9 A schematic view of a right side wall provided by the embodiments of the present application is shown in the figure;

[0030] Figure 10 A schematic view of a sub-bottom wall provided by the embodiments of the present application is shown in the figure;

[0031] Figure 11 A schematic view of a current collection assembly provided by an embodiment of the utility model;

[0032] Figure 12 A bottom view schematic view of a current collection sub-body provided by an embodiment of the utility model;

[0033] Figure 13 A left view of a sub-current collection body provided by an embodiment of the utility model;

[0034] Figure 14 A schematic view between adjacent battery monomers provided by an embodiment of the utility model Figure 1 ;

[0035] Figure 15 A schematic view between adjacent battery monomers provided by an embodiment of the utility model Figure 2 ;

[0036] Battery box 10, box 11, cover 12, first containing cavity 101, second containing cavity 102;

[0037] 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, back wall 112, front wall 113, left wall 114, third mounting hole 1141;

[0038] 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, third communication hole 11611, second partition plate 117;

[0039] 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;

[0040] Sealing fixing piece 30, first sealing fixing piece 31, second sealing fixing piece 32, third sealing fixing piece 33;

[0041] Current collection assembly 40, current collection body 41, current collection sub-body 401, second hollow structure 411 cooling current collection flow channel a3, third cooling flow channel 411, first liquid hole 4111, third hollow structure 412, gas current collection flow channel b1, first gas hole 4121, second gas hole 4122, first flow guide piece 42, fourth cooling flow channel a4, second flow guide piece 43, fifth cooling flow channel a5;

[0042] The first joint 51, the second joint 52, the pressure relief valve 53, and the adapter 54. DETAILED DESCRIPTION

[0043] The application will be further described below in detail with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related utility model, and not to limit the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for ease of description.

[0044] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and embodiments.

[0045] At least refer to Figures 1-15 As shown in the drawings, the utility model example provides a battery pack, comprising: a battery assembly 20, a battery box 10 and a busbar assembly 40.

[0046] The battery assembly 20 comprises a plurality of battery monomers 21 arranged along a first direction or / and a second direction, and an electrode cooling flow channel 201 is formed between adjacent battery monomers 21. Wherein, 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.

[0047] The battery box 10 comprises a box body 11 and a box cover 12 sealingly connected to the opening of the box body 11, and the battery assembly 20 is placed in the box body 11. The inner bottom wall 115 of the box body 11 is provided with a first cooling flow channel a2, and the first cooling flow channel a2 is sealingly communicated with one end of the electrode cooling flow channel 201.

[0048] The busbar assembly 40 is located between the battery assembly 20 and the box cover 12, and the busbar assembly 40 is provided with a gas bus flow channel b1 and a cooling bus flow channel a3, and the gas bus flow channel b1 and the cooling bus flow channel a3 are independent of each other. The cooling bus flow channel a3 is sealingly communicated with the other end of the electrode cooling flow channel 201. The gas bus flow channel b1 is sealingly communicated with the explosion-proof valve 211 of each battery monomer 21.

[0049] Wherein, the battery monomer 21 can be a square battery, a soft package battery or a cylindrical battery, and the following embodiments will be described with the battery monomer 21 as a square battery.

[0050] A plurality of battery monomers 21 can be arranged in a rectangular array, such as Figure 3 As shown in the drawings, a plurality of battery monomers 21 are arranged in columns along the first direction, and 4 columns are arranged side by side along the second direction to form the above-mentioned rectangular array.

[0051] In each column, an electrode cooling flow channel 201 is arranged between any two adjacent battery monomers 21, and the electrode cooling flow channel 201 is used for heat transfer with the battery monomer 21. For example, as shown inFigure 14 and Figure 15 As shown in FIG. 1, the battery assembly 20 further comprises a separator 22 clamped between two adjacent battery monomers 21. The separator 22 comprises opposite and spaced first and second end portions 221 and 222 clamped between opposite surfaces of the two adjacent battery monomers 21, and the first and second end portions 221 and 222 and the opposite surfaces of the two battery monomers 21 form the above-mentioned cell cooling flow channel 201.

[0052] Of course, it can be understood that if the separator 22 itself is a cavity structure, the cavity of the separator 22 is the above-mentioned cell cooling flow channel 201.

[0053] In this way, the battery monomer 21 itself serves as part of the cell cooling flow channel 201, so that the cooling medium in the cell cooling flow channel 201 can directly contact the outer surface of the battery monomer 21, forming a direct cooling type cooling. In other words, as shown in FIG. 1, the battery monomer 21 is immersed in the cooling medium in the left and right cell cooling flow channels 201, which is equivalent to an immersion type cell cooling structure, and there is no need to use a separate cooling plate to cooperate with the battery monomer 21, which not only makes the heat transfer efficiency higher, but also is suitable for high-rate charging and discharging use scenarios, and can also reduce the number of structural components in the battery assembly 20, and improve the energy density of the battery pack. Figure 3

[0054] In addition, as shown in FIG. 1, the separator 22 further comprises a separation portion 223 connecting the first and second end portions 221 and 222, and the separation portion 223 divides the cell cooling flow channel 201 into two cell sub-cooling flow channels 2011. The separation portion 223 can equally or unequally divide the cell cooling flow channel 201. In this way, when one of the two adjacent battery monomers 21 occurs thermal runaway, the separation portion 23 can prevent the thermal runaway battery monomer 21 from affecting the other battery monomer 21, and inhibit the spread of thermal runaway. Figure 14 Figure 15 It should be noted that the first and second end portions 221 and 222 and the separation portion 223 can be but not limited to integrally formed, and the separator 22 can be but not limited to injection molded by using a high-temperature-resistant insulating material.

[0055] As shown in FIG. 1, the box body 11 has a receiving cavity comprising a first receiving cavity 101 and a second receiving cavity 102, the first receiving cavity 101 placing the battery assembly 20, and the second receiving cavity 102 placing a battery management module, and each battery monomer 21 is electrically connected with the battery management module.

[0056] As shown in FIG. 1, the box body 11 has a receiving cavity comprising a first receiving cavity 101 and a second receiving cavity 102, the first receiving cavity 101 placing the battery assembly 20, and the second receiving cavity 102 placing a battery management module, and each battery monomer 21 is electrically connected with the battery management module. Figure 3 In specific embodiments, as shown in FIG. 1, the box body 11 has a receiving cavity comprising a first receiving cavity 101 and a second receiving cavity 102, the first receiving cavity 101 placing the battery assembly 20, and the second receiving cavity 102 placing a battery management module, and each battery monomer 21 is electrically connected with the battery management module.

[0057] Figure 6 Figure 8 ​​​​As shown, the box body 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 positions where the side walls and the bottom wall 115 are connected have good sealing performance. The plurality of side walls include 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 and the plurality of side walls can but not limited to adopt hollow aluminum profiles, so as to reduce the weight of the entire box body 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.

[0058] As shown in Figure 6 and Figure 8 , a second partition plate 117 is arranged in the box body 11. The second partition plate 117 is arranged along the second direction. The second partition plate 117 divides the accommodation cavity into a first accommodation cavity 101 and a second accommodation cavity 102 which are independent of each other.

[0059] 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 first direction. A plurality of first communication holes 1152 are arranged on the surface of the sub-bottom wall 11501 which contacts 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 communicates 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 communicates 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 to realize heat transfer between the cooling medium and the battery monomer 21.

[0060] It should be noted that the bottom wall 115 itself forms the first cooling flow channel a2, which avoids arranging the cooling flow channel in the first accommodation cavity 101, so as to maximize the internal space of the battery box 10, improve the energy density of the battery pack, reduce the number of structural parts of the battery box 10, and help to improve the assembly efficiency of the battery box 10.

[0061] As shown in Figure 11 and Figure 12As shown, the busbar assembly 40 may, but is not limited to, be plate-shaped. The busbar assembly 40 is located above the battery assembly 20, and its projection onto the battery assembly 20 at least covers the battery assembly 20. A gas busbar channel b1 and a cooling busbar channel a3 are provided on the busbar assembly 40, and these two channels are independent of each other. Both the gas busbar channel b1 and the cooling busbar channel a3 extend along a second direction.

[0062] like Figure 12 As shown, a plurality of first liquid holes 4111 are arranged at equal intervals along the length of the cooling manifold a3, and each first liquid hole 4111 is connected to the cooling manifold a3. Each first liquid hole 4111 is located in the region between two adjacent battery cells 21, that is, the first liquid hole 4111 is connected to the upper port of its corresponding cell cooling channel 201. Thus, the cooling medium in the cell cooling channel 201 can enter the cooling manifold a3, thereby realizing the discharge of the cooling medium from the battery assembly 20.

[0063] Multiple first vents 4121 are arranged at equal intervals along the length of the gas manifold b1, and each first vent 4121 is connected to the gas manifold b1. The first vents 4121 are arranged vertically and vertically corresponding to the explosion-proof valves 211 of the battery cells 21, and the two are connected. Thus, when a large amount of gas is released when a battery cell 21 experiences thermal runaway, it can enter the gas manifold b1 and then be discharged outside the battery pack, avoiding safety accidents such as fire and explosion of the entire battery pack. At the same time, since the explosion-proof valves 211 of each battery cell 21 are connected to the gas manifold b1, when a battery cell 21 experiences thermal runaway, the gas discharged by that battery cell 21 will not affect other battery cells 21, nor will it come into contact with the cooling medium, thus achieving directional exhaust of thermal runaway gas from the battery cell 21.

[0064] In summary, the first cooling channel a2 on the bottom wall 115, the cell cooling channel 201, and the cooling confluence channel a3 of the busbar assembly 40 are combined to form a path for cooling the battery cells 21 entering and exiting the battery assembly 20, thus achieving cooling of the battery cells 21. The bottom wall 115 itself forms the first cooling channel a2, avoiding the need for a cooling channel in the housing space of the battery box 10. This maximizes the internal space of the battery box 10, improving the energy density of the battery pack, and reduces the number of structural components in the battery box 10, which helps improve the assembly efficiency of the battery box 10. When a battery cell 21 experiences thermal runaway, the large amount of gas released can enter the gas confluence channel b1 of the busbar assembly 40 and then be discharged outside the battery pack, preventing safety accidents such as fire or explosion of the entire battery pack. In addition, the cooling medium in the cooling confluence channel a3 has a cooling effect on the gas in the gas confluence channel b1, causing the gas temperature to drop, delaying the spread of thermal runaway, and reducing the possibility of battery pack fire or even explosion.

[0065] 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 is in communication with each first cooling flow channel a2, respectively.

[0066] In a specific embodiment, as shown in Figure 6 , Figure 8 and Figure 9 , four first cooling flow channels a2 are arranged side by side in the front-rear direction on the bottom wall 115. A distribution bending part 1111 is protruded on the inner surface of the right side wall 111, that is, the distribution bending part 1111 is located in the first accommodating 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.

[0067] In the structure in which the second cooling flow channel a1 is in communication with each first cooling flow channel a2, 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, and 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 7 , 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 the battery module 20 is cooled, and the temperature of each battery cell 21 is substantially the same.

[0068] 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 body 11, and at least part of the second cooling flow channels a1 are connected to each first cooling flow channel a2 one by one.

[0069] In addition, as shown in Figure 8 and Figure 9 , the second cooling flow channel a1 can be arranged on the left side wall 110, and the second cooling flow channel a1 is in communication with each first cooling flow channel a2, respectively.As shown, an opening 11111 is formed at the top of the liquid separation 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 connector 51. The first connector 51 can be a connector for introducing cooling medium. The cooling medium introduced from the first connector 51 is dispersed into each first cooling flow channel a2 through the second cooling flow channel a1.

[0070] As an implementation manner, the cooling bus flow channel a3 is provided with a plurality of first liquid holes 4111 at intervals along the length extension direction thereof. Each first liquid hole 4111 is located in the region between adjacent battery monomers 21 and communicates with the port of the corresponding cell cooling flow channel 201.

[0071] In a specific embodiment, as shown, Figures 11-13 The bus assembly 40 includes a bus body 41, two first flow guides 42, and a second flow guide 43. The bus body 41 is plate-shaped and includes a plurality of bus sub-bodies 401, which can be but are not limited to hollow aluminum profiles. The bus sub-bodies 401 are spliced and welded to form the bus body 41.

[0072] Figure 13 As shown, the bus 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 bus flow channel a3, and one third hollow structure 412 is a gas bus flow channel b1. The cooling bus flow channel a3 and the gas bus flow channel b1 are arranged alternately in the first direction. In this way, the cooling medium in the cooling bus flow channel a3 cools the gas in the gas bus 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.

[0073] As shown, Figure 12 The cooling bus flow channel a3 is provided with a plurality of first liquid holes 4111 at equal intervals along the length extension direction thereof. Each first liquid hole 4111 is located in the region between adjacent battery monomers 21 and communicates with the upper port of the corresponding cell cooling flow channel 201. In this way, the cooling medium that has completed heat transfer with the battery assembly 20 can be discharged in time.

[0074] As shown, Figure 12 The gas bus flow channel b1 is provided with a plurality of first gas holes 4121 at equal intervals along the length extension direction thereof. Each first gas hole 4121 communicates with the explosion-proof valve 211 of the corresponding battery monomer 21.

[0075] As shown, Figure 11As shown, 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 confluence body 41, and two first flow guides 42 are arranged on the front and back sides of the confluence body 41 respectively. The fourth cooling flow channel a4 of the first flow guide 42 on the back side is in communication with one port of each third cooling flow channel 411, and the fourth cooling flow channel a4 of the first flow guide 42 on the front side is in communication with the other port of each third cooling flow channel 411.

[0076] 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 confluence body 41, and the second flow guide 43 is located on the right side of the confluence body 41. The two ports of the fifth cooling flow channel a5 of the second flow guide 43 are in communication with the fourth cooling flow channels a4 of the two first flow guides 42 respectively.

[0077] As shown in FIG. 1, the first flow guide 42 has a first cooling flow channel a2, the length direction of the first flow guide 42 is parallel to the length direction of the confluence body 41, and two first flow guides 42 are arranged on the front and back sides of the confluence body 41 respectively. Figure 8 As shown in FIG. 1, the first flow guide 42 has a first cooling flow channel a2, the length direction of the first flow guide 42 is parallel to the length direction of the confluence body 41, and two first flow guides 42 are arranged on the front and back sides of the confluence body 41 respectively. Figure 11 As shown in FIG. 1, the first flow guide 42 has a first cooling flow channel a2, the length direction of the first flow guide 42 is parallel to the length direction of the confluence body 41, and two first flow guides 42 are arranged on the front and back sides of the confluence body 41 respectively.

[0078] As shown in FIG. 1, the first flow guide 42 has a first cooling flow channel a2, the length direction of the first flow guide 42 is parallel to the length direction of the confluence body 41, and two first flow guides 42 are arranged on the front and back sides of the confluence body 41 respectively.

[0079] In practical application, the service life of the battery monomer 21 will be affected by the temperature used by the battery monomer 21, and the battery monomer 21 is not suitable for working in high temperature and low temperature state. Based on this, the first joint 5151 and the second joint 5252 are respectively in communication with the thermal management unit, and the thermal management unit is used to adjust the flow rate of the cooling medium, so that the battery monomer 21 is in the suitable use temperature.

[0080] For example, the BMS can monitor the temperature change of the battery monomer 21 in the battery pack in real time, and can transmit the data to the thermal management unit in real time. The thermal management unit starts to control the heating or cooling cycle to start according to the feedback data of the BMS, and can control the flow rate of the cooling medium in the cycle process, so as to ensure that the battery monomer 21 is in the best working state, thereby improving the service life of the battery monomer 21, and the control strategy is as follows:

[0081] When the battery cell 21 temperature ≤ 15℃, it is judged that the battery cell 21 is in low temperature working condition, at this time the battery cell 21 temperature should be improved, so the heating cycle is opened, and the battery cell 21 temperature is different from the configuration of different cooling medium flow rate, for example, the temperature ≤ 10℃, the cooling medium flow rate is 10L / min, the temperature ≤ 5℃, the cooling medium flow rate is 20L / min;

[0082] When the battery cell 21 temperature ≥ 40℃, it is judged that the battery cell 21 is in high temperature working condition, at this time the battery cell 21 temperature should be reduced, so the cooling cycle is opened, the cooling medium flow rate is controlled according to the battery cell 21 temperature, for example, the temperature ≥ 45℃, the cooling medium flow rate is 10L / min, the temperature ≥ 50℃, the cooling medium flow rate is 20L / min;

[0083] When the battery cell 21 triggers thermal runaway, the battery cell 21 will reach several hundred degrees high temperature, it can be set that when the battery cell 21 temperature ≥ 100℃, it is judged that the battery cell 21 triggers thermal runaway, at this time, the cooling medium flow rate should be adjusted to the maximum speed, for example, 30L / min or 50L / min.

[0084] Optionally, in an embodiment, the battery box 10 comprises an exhaust member (not shown). The exhaust member can pass through the box body 11 and be installed on the box body 11, or pass through the box cover 12 and be installed on the box cover 12. The exhaust member communicates with each gas confluence flow channel b1, and the exhaust member discharges the gas outside the battery box 10, thereby avoiding the safety accidents such as fire and explosion of the whole battery pack.

[0085] Optionally, in another embodiment, at least one first partition plate 116 is arranged in the battery box 10, and a first exhaust channel b2 is arranged in the first partition plate 116, and the first exhaust channel b2 communicates with each gas confluence flow channel b1.

[0086] In detail, as shown in Figure 6 A first partition plate 116 is arranged in the box body 11, the length of the first partition plate 116 is arranged along the first direction, the first partition plate 116 divides the second accommodating cavity 102 into mutually independent second sub-accommodating chambers, and the first partition plate 116 divides the first accommodating cavity 101 into a plurality of mutually independent first sub-accommodating chambers. For example, the first partition plate 116 divides the first accommodating cavity 101 into two mutually independent first sub-accommodating chambers, when the battery cell 21 in the first sub-accommodating chamber on the front side triggers thermal runaway, the first partition plate 116 can play a blocking role to avoid the influence on the battery cell 21 in the first sub-accommodating chamber on the rear side.

[0087] As shown in Figure 5 and Figure 6As shown, the first partition plate 116 can be but is not limited to a hollow aluminum profile, and the first partition plate 116 is provided with a plurality of fourth hollow structures 1161, one of which serves 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 of which is in communication with the first exhaust channel b2, and each of which is arranged at intervals along the length direction of the first partition plate 116.

[0088] Each of the gas bus flow channels b1 is also provided with a second gas hole 4122 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. Figure 5 In this way, the gas in the busbar assembly 40 can enter the interior of the first partition plate 116 from the second gas hole 4122 and the third communication hole 11611, achieving timely discharge of the gas in the busbar assembly 40.

[0089] As shown, Figure 5 , Figure 8 and Figure 9 the second mounting hole 1113 is provided on the right side wall 111. The pressure relief valve 53 passes through the second mounting hole 1113 and is in communication with the first exhaust channel b2, 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.

[0090] 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.

[0091] As shown, Figure 3 , Figure 4 the first sealing fixing member 31 is clamped between the battery assembly 20 and the bottom wall 115 of the box body 11, achieving sealed communication of the first cooling flow channel a2 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 busbar assembly 40, achieving sealed communication of the first cooling flow channel a2 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 busbar assembly 40, achieving sealed communication of the gas bus flow channel b1 with the explosion-proof valve 211 of the battery monomer 21.

[0092] The sealing fixing member 30, on the one hand, has a sealing effect, inhibiting the entry of gas or cooling medium into the first accommodating cavity 101, and on the other hand, has an effect of fixing the battery monomer 21, so that the battery monomers 21 are arranged in an array, avoiding the use of CTP grouping method to stack the battery monomers 21, reducing the number of parts and the manufacturing cost.

[0093] The utility model example still provides a kind of battery pack heat management device, the device includes heat management unit and above-mentioned battery pack, heat management unit passes through the cooling medium flow rate in the first cooling flow channel a2 of battery pack, cell cooling flow channel 201, to adjust the temperature of battery pack.Advantages of battery pack heat management device have above-mentioned battery pack, therefore do not repeat.

[0094] It should be understood that the above, if there is involved the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" are only for the purpose of description, 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", "second" can be explicitly or implicitly include one or more features. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0095] 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 should also cover other technical solutions formed by the above technical features or their equivalent features in any combination without departing from the utility model concept. For example, the technical solutions formed by mutually replacing the above features and the technical features disclosed in the present application (but not limited to) having similar functions.

Claims

1. A battery pack, characterized in that, include: A battery assembly (20) comprising a plurality of battery cells (21) arranged along a first direction and / or a second direction, wherein a cell cooling channel (201) is formed between adjacent battery cells (21); A battery box (10) includes a box body (11) and a box cover (12) sealed to the opening of the box body (11). The battery assembly (20) is placed inside the box body (11). The bottom wall (115) of the box body (11) is provided with a first cooling channel (a2). The first cooling channel (a2) is connected to one end of the battery cell cooling channel (201). The first direction and the second direction are respectively the length direction of the battery box (10) and the width direction of the battery box (10). A current-collecting assembly (40) is located between the battery assembly (20) and the casing cover (12). The current-collecting assembly (40) is provided with a gas current-collecting channel (b1) and a cooling current-collecting channel (a3). The gas current-collecting channel (b1) and the cooling current-collecting channel (a3) ​​are independent of each other. The cooling current-collecting channel (a3) ​​is connected to the other end of the cell cooling channel (201). The gas manifold (b1) is connected to the explosion-proof valve (211) of each of the battery cells (21); A sealing fastener (30) is provided between the battery assembly (20) and the bottom wall (115) of the housing (11); or / and, the sealing fastener (30) is provided between the battery assembly (20) and the busbar assembly (40).

2. The battery pack according to claim 1, characterized in that, The junction assembly (40) includes a junction body (41), in which multiple gas junction channels (b1) are arranged side by side. Multiple first vents (4121) are arranged at intervals along the length of each gas junction channel (b1), and each first vent (4121) is connected to the explosion-proof valve (211) of its corresponding battery cell (21).

3. The battery pack according to claim 2, characterized in that, It also includes an exhaust pipe that passes through the battery box (10), the exhaust pipe being connected to the gas manifold (b1), the exhaust pipe being used to discharge gas outside the battery box (10).

4. The battery pack according to claim 2, characterized in that, The battery box (10) is provided with at least one first partition plate (116). The first partition plate (116) is provided with a first exhaust channel (b2), which is connected to each of the gas confluence channels (b1).

5. The battery pack according to claim 4, characterized in that, The first partition plate (116) has a plurality of third connecting holes (11611) on its surface facing the manifold assembly (40), and each of the third connecting holes (11611) is connected to the first exhaust duct (b2). The gas confluence channel (b1) is also provided with at least one second vent (4122), which is connected to the third connecting hole (11611).

6. The battery pack according to claim 5, characterized in that, The second vent (4122) is located in the middle of the length of the gas confluence channel (b1).

7. The battery pack according to claim 5, characterized in that, It also includes a pressure relief valve (53) that is connected to the first exhaust passage (b2).

8. The battery pack according to claim 5, characterized in that, The housing (11) includes a first accommodating cavity (101) for housing the battery assembly (20), and the first partition plate (116) divides the first accommodating cavity (101) into mutually independent first sub-accommodating cavities.

9. The battery pack according to any one of claims 4-8, characterized in that, The sealing fastener (30) includes a third sealing fastener (33), which is sandwiched between the manifold assembly (40) and the first partition plate (116) to make the gas manifold channel (b1) and the explosion-proof valve (211) of each battery cell (21) in a sealed communication.

10. A battery pack thermal management device, characterized in that, Includes a thermal management unit and a battery pack according to any one of claims 1-9. The thermal management unit adjusts the temperature of the battery pack by regulating the flow rate of the cooling medium in the first cooling channel (a2) and the cell cooling channel (201) of the battery pack.

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