Battery pack

Abstract

The present invention provides a battery pack, which includes a cooling plate body that is attached to the battery body; a plurality of first cooling channels provided on the cooling plate body; a plurality of second cooling channels, and the plurality of first cooling channels and the plurality of second cooling channels are alternately and spaced apart in sequence along the length direction or the width direction of the cooling plate body, and the flow direction of the coolant in each first cooling channel is opposite to the flow direction of the coolant in each second cooling channel; a first confluence channel, the liquid outlets of each first cooling channel are respectively communicated with the first confluence channel, and the coolant in each first cooling channel is discharged after being confluent through the first confluence channel; a second confluence channel, the liquid outlets of each second cooling channel are respectively communicated with the second confluence channel, and the coolant in each second cooling channel is discharged after being confluent through the second confluence channel. This application solves the problem that the heat dissipation efficiency of the battery pack in the prior art is low, thereby reducing the working efficiency of the battery pack.

Description

Technical Field

[0001] The present invention relates to the technical field of heat dissipation of energy storage batteries, and more specifically, to a battery pack. Background Art

[0002] Currently, in the field of energy storage batteries, in order to increase the output power of the battery, the number of battery cells is usually increased, thereby increasing the overall size of the battery pack to meet the needs of users.

[0003] However, since the battery pack generates heat during use, heat dissipation is provided for the battery pack during the assembly process. Most of the existing battery packs use heat dissipation fins or liquid cooling for heat dissipation. Taking liquid cooling for heat dissipation as an example, the coolant flow direction in the flow channels of the liquid cooling structure in the prior art is single, and the distribution of the flow channel positions is uneven, resulting in uneven temperature distribution inside the battery pack and the problem of excessive temperature rise of some battery cells, with low heat exchange efficiency and greatly reducing the working efficiency of the energy storage battery pack. Summary of the Invention

[0004] The main object of the present invention is to provide a battery pack to solve the problem that the heat dissipation efficiency of the battery pack in the prior art is low, thereby reducing the working efficiency of the battery pack.

[0005] To achieve the above object, according to one aspect of the present invention, there is provided a battery pack, including a battery body. The battery pack further includes: a cooling plate body, which is in contact with the battery body to cool the battery body; a plurality of first cooling channels, which are arranged on the cooling plate body; a plurality of second cooling channels, which are arranged on the cooling plate body. The plurality of first cooling channels and the plurality of second cooling channels are alternately and spaced in sequence along the length direction or width direction of the cooling plate body, and the flow direction of the coolant in each first cooling channel is opposite to the flow direction of the coolant in each second cooling channel; a first confluence channel, which is arranged on the cooling plate body, and the liquid outlets of each first cooling channel are respectively connected to the first confluence channel, and the coolant in each first cooling channel is discharged after being confluent through the first confluence channel; a second confluence channel, which is arranged on the cooling plate body, and the liquid outlets of each second cooling channel are respectively connected to the second confluence channel, and the coolant in each second cooling channel is discharged after being confluent through the second confluence channel.

[0006] Further, each first cooling channel includes: a first liquid inlet section, a first connection section, and a first liquid discharge section that are connected in sequence. The first liquid inlet section and the first liquid discharge section extend along the horizontal direction respectively, and the first connection section extends along a wavy trajectory; and / or, each second cooling channel includes: a second liquid inlet section, a second connection section, and a second liquid discharge section that are connected in sequence. The second liquid inlet section and the second liquid discharge section extend along the horizontal direction respectively, and the second connection section extends along a wavy trajectory.

[0007] Further, a plurality of first cooling channels and a plurality of second cooling channels are alternately and spacedly arranged in sequence along the length direction of the cooling plate body; the battery pack further includes: a first shunt channel provided on the cooling plate body, the first shunt channel extending along the width direction of the cooling plate body, and the liquid inlets of each of the first cooling channels are respectively communicated with the first shunt channel, and the coolant flows into each of the first cooling channels through the first shunt channel.

[0008] Further, the battery pack further includes: a second shunt channel provided at one end of the cooling plate body far from the first shunt channel, the second shunt channel extending along the width direction of the cooling plate body, and the liquid inlets of each of the second cooling channels are respectively communicated with the second shunt channel, and the coolant flows into each of the second cooling channels through the second shunt channel.

[0009] Further, the battery pack further includes: a liquid inlet channel provided on the cooling plate body; a first input channel provided on the cooling plate body, one end of the first input channel being communicated with the first shunt channel, and the other end of the first input channel being communicated with the liquid inlet channel; a second input channel provided on the cooling plate body, one end of the second input channel being communicated with the second shunt channel, and the other end of the second input channel being communicated with the liquid inlet channel; the coolant flows into the first input channel and the second input channel respectively through the liquid inlet channel.

[0010] Further, the battery pack further includes: a liquid outlet channel provided on the cooling plate body; the liquid outlets of the first confluence channel and the second confluence channel are respectively communicated with the liquid outlet channel.

[0011] Further, the battery pack further includes: a first liquid outlet channel and a second liquid outlet channel, the first liquid outlet channel and the second liquid outlet channel are respectively provided on the cooling plate body, two ends of the first liquid outlet channel are respectively communicated with the liquid outlet channel and the first confluence channel, and two ends of the second liquid outlet channel are respectively communicated with the liquid outlet channel and the second confluence channel; wherein, a first liquid outlet section is provided at the liquid outlet end of the first liquid outlet channel, a second liquid outlet section is provided at the liquid outlet end of the second liquid outlet channel, and the first liquid outlet section and the second liquid outlet section are respectively bent toward the liquid inlet direction of the liquid outlet channel, so that the outflow direction of the coolant in the first liquid outlet section is the same as the outflow direction of the coolant in the second liquid outlet section.

[0012] Further, the cooling plate body includes: a bottom plate, each of the first cooling channels and each of the second cooling channels are respectively provided on the bottom plate; a cover plate buckled on the bottom plate, and the first confluence channel and the second confluence channel are provided on the cover plate.

[0013] Further, the battery pack further includes: a convex body provided on the cover plate, the convex body protruding away from the bottom plate relative to the cover plate; there are two convex bodies to respectively form the first confluence channel and the second confluence channel between each convex body and the cover plate.

[0014] Furthermore, a plurality of first confluence ports are provided on the cover plate. Each of the first confluence ports is respectively connected to the first confluence flow channel. The plurality of first confluence ports are arranged in one-to-one correspondence with the plurality of first cooling channels. The coolant in each of the first cooling channels flows into the first confluence flow channel through each of the first confluence ports. A plurality of second confluence ports are also provided on the cover plate. Each of the second confluence ports is respectively connected to the second confluence flow channel. The plurality of second confluence ports are arranged in one-to-one correspondence with the plurality of second cooling channels. The coolant in each of the second cooling channels flows into the second confluence flow channel through each of the second confluence ports.

[0015] Applying the technical solution of the present invention, the battery pack includes a battery body, a cooling plate body, a plurality of first cooling channels, a plurality of second cooling channels, a first confluence flow channel and a second confluence flow channel. The cooling plate body is fitted to the battery body to cool the battery body. The plurality of first cooling channels and the plurality of second cooling channels are respectively arranged on the cooling plate body. The plurality of first cooling channels and the plurality of second cooling channels are alternately and spaced in sequence along the length direction or the width direction of the cooling plate body. The flow direction of the coolant in each of the first cooling channels is opposite to the flow direction of the coolant in each of the second cooling channels. The first confluence flow channel and the second confluence flow channel are respectively arranged on the cooling plate body. The coolant in each of the first cooling channels is discharged after being confluent through the first confluence flow channel. The liquid outlets of each of the second cooling channels are respectively connected to the second confluence flow channel. The coolant in each of the second cooling channels is discharged after being confluent through the second confluence flow channel. Such an arrangement can avoid the situation that the temperature of the coolant at the rear end of the flow channel rises and the heat absorption efficiency decreases, resulting in uneven temperature distribution inside the battery pack. The coolant flows synchronously in each of the first cooling channels and each of the second cooling channels, and a convection effect is formed in the first cooling channels and the second cooling channels, uniformly absorbing heat inside the battery pack, thereby optimizing the heat dissipation effect of the battery pack and improving the working efficiency of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0017] Figure 1 shows a schematic structural diagram of an embodiment of a cooling plate body in a battery pack according to the present invention;

[0018] Figure 2 shows a schematic structural diagram of a bottom plate in a battery pack according to the present invention;

[0019] Figure 3 shows a schematic structural diagram of a cover plate in a battery pack according to the present invention;

[0020] Figure 4 shows a schematic diagram of the coolant flow direction in a battery pack according to the present invention;

[0021] Figure 5 Shows a schematic structural diagram of a first busbar port in a battery pack according to the present invention;

[0022] Figure 6 Shows a schematic structural diagram of a second busbar port in a battery pack according to the present invention;

[0023] Figure 7 Shows according to Figure 1 An enlarged view of part A in

[0024] Among them, the above-mentioned drawings include the following reference numerals:

[0025] 1. Cooling plate body; 2. First cooling flow channel; 21. First liquid inlet section; 22. First liquid discharge section; 23. First communication section; 3. Second cooling flow channel; 31. Second liquid inlet section; 32. Second liquid discharge section; 33. Second communication section; 4. First busbar flow channel; 5. Second busbar flow channel; 61. First diversion channel; 62. Second diversion channel; 70. Liquid inlet channel; 71. First input channel; 72. Second input channel; 80. Liquid outlet channel; 81. First liquid outlet flow channel; 82. Second liquid outlet flow channel; 810. First liquid outlet section; 811. Third liquid outlet section; 820. Second liquid outlet section; 821. Fourth liquid outlet section; 11. Bottom plate; 12. Cover plate; 13. Protrusion body; 120. First busbar port; 121. Second busbar port. Specific embodiments

[0026] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0027] As mentioned in the background art, currently, a heat dissipation device is usually provided in a battery pack to dissipate heat from the battery to ensure the safety of the battery pack during use. The heat dissipation device is attached to the battery body and has an internal coolant flow channel. During the flow of the coolant, the heat dissipated by the battery body is carried away. In existing heat dissipation devices, most of the coolant flow channels are in an S-shaped structure, and the coolant circulates in a fixed direction. However, with such a setting, since the temperature of the coolant continuously rises during the flow, its heat absorption capacity decreases when flowing through the rear flow channel, resulting in uneven temperature distribution inside the battery pack, low heat transfer efficiency, and greatly reducing the working efficiency of the energy storage battery pack. To solve the above technical problems, in the battery pack provided in this application, a plurality of first cooling channels 2 and a plurality of second cooling channels 3 are provided on the cooling plate body 1. The plurality of first cooling channels 2 and the plurality of second cooling channels 3 are alternately and spaced in sequence along the width direction of the cooling plate body 1, and the flow directions of the coolant in each of the first cooling channels 2 and each of the second cooling channels 3 are opposite. This enables the coolant in an adjacent first cooling channel 2 and second cooling channel 3 to form a convection effect, so that the heat absorption amount is evenly distributed during the flow of the coolant. Further, by providing a first confluence channel 4, the coolant in each of the first cooling channels 2 is confluent and then discharged, thereby realizing the circulation of the coolant in each of the first cooling channels 2. By providing a second confluence channel 5, the coolant in each of the second cooling channels 3 is confluent and then discharged, thereby realizing the circulation of the coolant in each of the second cooling channels 3. Each of the first cooling channels 2 and each of the second cooling channels 3 cooperate with each other to evenly dissipate heat from each position of the battery body, making the temperature distribution inside the battery pack uniform, and further improving the working efficiency of the battery pack.

[0028] Please refer to Figures 1 to 7 , the present invention provides a battery pack, including a battery body. The battery pack further includes: a cooling plate body 1, attached to the battery body to cool the battery body; a plurality of first cooling channels 2, provided on the cooling plate body 1; a plurality of second cooling channels 3, provided on the cooling plate body 1. The plurality of first cooling channels 2 and the plurality of second cooling channels 3 are alternately and spaced in sequence along the length direction or width direction of the cooling plate body 1, and the flow direction of the coolant in each of the first cooling channels 2 is opposite to the flow direction of the coolant in each of the second cooling channels 3; a first confluence channel 4, provided on the cooling plate body 1. The liquid outlets of each of the first cooling channels 2 are respectively connected to the first confluence channel 4, and the coolant in each of the first cooling channels 2 is confluent and then discharged through the first confluence channel 4; a second confluence channel 5, provided on the cooling plate body 1. The liquid outlets of each of the second cooling channels 3 are respectively connected to the second confluence channel 5, and the coolant in each of the second cooling channels 3 is confluent and then discharged through the second confluence channel 5.

[0029] According to the battery pack provided by the present application, it includes a battery body. The battery pack further includes a cooling plate body 1, a plurality of first cooling channels 2, a plurality of second cooling channels 3, a first confluence channel 4, and a second confluence channel 5. The cooling plate body 1 is in contact with the battery body to cool the battery body. The plurality of first cooling channels 2 and the plurality of second cooling channels 3 are respectively arranged on the cooling plate body 1. The plurality of first cooling channels 2 and the plurality of second cooling channels 3 are arranged alternately and at intervals in the length direction or width direction of the cooling plate body 1. The flow direction of the coolant in each first cooling channel 2 is opposite to the flow direction of the coolant in each second cooling channel 3. The first confluence channel 4 and the second confluence channel 5 are respectively arranged on the cooling plate body 1. The coolant in each first cooling channel 2 is discharged after being confluent through the first confluence channel 4. The liquid outlets of each second cooling channel 3 are respectively connected to the second confluence channel 5. The coolant in each second cooling channel 3 is discharged after being confluent through the second confluence channel 5. Such a setting can avoid the situation of uneven temperature distribution inside the battery pack caused by the increase in the temperature of the coolant at the rear end of the channel and the decrease in the heat absorption efficiency. The coolant flows synchronously in each first cooling channel 2 and each second cooling channel 3, and a convection effect is formed in the first cooling channel 2 and the second cooling channel 3 to uniformly absorb heat inside the battery pack, thereby optimizing the heat dissipation effect of the battery pack and improving the working efficiency of the battery pack.

[0030] In the embodiment provided by the present application, at least part of each first cooling channel 2 and / or at least part of each second cooling channel 3 extends along a wavy trajectory. Among them, at least part of each first cooling channel 2 and at least part of each second cooling channel 3 extend along a wavy trajectory. Such a setting can increase the flow stroke of the coolant in the first cooling channel 2 and the second cooling channel 3, and further increase the effective heat exchange area between the coolant and the battery body. Preferably, the extension trajectories of each first cooling channel 2 and each second cooling channel 3 are along the sine function curve trajectory. Compared with the straight channel, the finite heat exchange area between the coolant and the battery heat source can be greatly increased, the heat exchange amount can be increased, and the increase in flow resistance is relatively small.

[0031] Among them, each first cooling channel 2 includes a first liquid inlet section 21 and a first liquid discharge section 22. The first liquid inlet section 21 and the first liquid discharge section 22 are connected by a first communication section 23. The first liquid inlet section 21 and the first liquid discharge section 22 extend along the horizontal direction respectively. Such a setting is to ensure that the liquid inlet and liquid discharge of the first cooling channel 2 are smoother, and to avoid the impact of the coolant on the inner wall of the first cooling channel 2 during the liquid inlet or liquid discharge process, thereby reducing the liquid inlet flow rate or the liquid discharge flow rate. The first communication section 23 extends along a wavy track, preferably a sine function curve track. After the liquid inlet is stabilized through the first liquid inlet section 21, the coolant flows along the first communication section 23. Each second cooling channel 3 includes a second liquid inlet section 31 and a second liquid discharge section 32. The second liquid inlet section 31 and the second liquid discharge section 32 are connected by a second communication section 33. The second liquid inlet section 31 and the second liquid discharge section 32 extend along the horizontal direction respectively. Such a setting is to ensure that the liquid inlet and liquid discharge of the second cooling channel 3 are smoother, and to avoid the impact of the coolant on the inner wall of the second cooling channel 3 during the liquid inlet or liquid discharge process, thereby reducing the liquid inlet flow rate or the liquid discharge flow rate. The second communication section 33 extends along a wavy track, preferably a sine function curve track. After the liquid inlet is stabilized through the second liquid inlet section 31, the coolant flows along the second communication section 33. This is to ensure that the coolant flows more smoothly in each first cooling channel 2 and each second cooling channel 3. At the same time, the curved track can extend the flow stroke of the coolant, thereby increasing the heat exchange area between the coolant and the battery heat source.

[0032] Specifically, as Figure 1 and Figure 4 shown, a plurality of first cooling channels 2 and a plurality of second cooling channels 3 are alternately and spacedly arranged in sequence along the length direction of the cooling plate body 1. The battery pack further includes: a first shunt channel 61 provided on the cooling plate body 1. The first shunt channel 61 extends along the width direction of the cooling plate body 1. The liquid inlets of each first cooling channel 2 are respectively connected to the first shunt channel 61. The coolant flows into each first cooling channel 2 through the first shunt channel 61. By providing the first shunt channel 61, the coolant is shunted to each first cooling channel 2. During the flow of the coolant, the coolant flows into each first cooling channel 2 through the first shunt channel 61 respectively. The first shunt channel 61 not only shunts the coolant, but also dissipates heat from the battery body during the shunting process, thereby increasing the heat absorption range of the battery body.

[0033] Further, the battery pack further includes: a second shunt channel 62 disposed at an end of the cooling plate body 1 away from the first shunt channel 61. The second shunt channel 62 extends along the width direction of the cooling plate body 1. The liquid inlets of the respective second cooling channels 3 are respectively connected to the second shunt channel 62, and the coolant flows into the respective second cooling channels 3 through the second shunt channel 62. By providing the second shunt channel 62, the respective second cooling channels 3 are shunted. During the flow of the coolant, the coolant flows into the respective second cooling channels 3 through the second shunt channel 62. The second shunt channel 62 and the first shunt channel 61 cooperate together to increase the heat absorption range of the battery body.

[0034] In the present application, the respective first cooling channels 2 and the respective second cooling channels 3 respectively extend along the length direction of the cooling plate body 1. Along the length direction of the cooling plate body 1, the cooling plate body 1 includes a first side end and a second side end which are oppositely arranged. The first shunt channel 61 is disposed at the first side end, and the first confluence channel 4 is disposed at the second side end; the second shunt channel 62 is disposed at the second side end, and the second confluence channel 5 is disposed at the first side end. Thus, after the coolant flows into the respective first cooling channels 2 from the first shunt channel 61, it is confluent and discharged through the first confluence channel 4. After the coolant flows into the respective second cooling channels 3 from the second shunt channel 62, it is confluent and discharged through the second confluence channel 5.

[0035] Among them, the respective first cooling channels 2, the respective second cooling channels 3, the first shunt channel 61 and the second shunt channel 62 are respectively disposed inside the cooling plate body 1. The first confluence channel 4 and the second confluence channel 5 are disposed on the plate surface of the cooling plate body 1. The liquid outlet end of the first shunt channel 61 is closer to the first side end of the cooling plate body 1 relative to the respective second cooling channels 3. The horizontal distance range between the first shunt channel 61 and the respective second cooling channels 3 is 2 cm to 4 cm. The liquid outlet end of the second shunt channel 62 is closer to the second side end of the cooling plate body 1 relative to the respective first cooling channels 2. The horizontal distance range between the second shunt channel 62 and the respective first cooling channels 2 is 2 cm to 4 cm. Preferably, the minimum horizontal distance between the first shunt channel 61 and the second confluence channel 5 is 2 cm to 4 cm, and the minimum horizontal distance between the second shunt channel 62 and the first confluence channel 4 is 2 cm to 4 cm. Thereby, the situation of mutual interference between the first shunt channel 61 and the second confluence channel 5 and the mutual interference between the second shunt channel 62 and the first confluence channel 4 is avoided. At the same time, the lengths of the first cooling channel 2 and the second cooling channel 3 are extended as much as possible, and the coverage area of the coolant on the cooling plate body 1 is increased, thereby increasing the cooling efficiency of the cooling plate body 1.

[0036] In the specific implementation process, the battery pack further includes: a liquid inlet channel 70 provided on the cooling plate body 1; a first input channel 71 provided on the cooling plate body 1, one end of the first input channel 71 is connected to the first shunt channel 61, and the other end of the first input channel 71 is connected to the liquid inlet channel 70; a second input channel 72 provided on the cooling plate body 1, one end of the second input channel 72 is connected to the second shunt channel 62, and the other end of the second input channel 72 is connected to the liquid inlet channel 70; the coolant flows into the first input channel 71 and the second input channel 72 respectively through the liquid inlet channel 70. Among them, the flow directions of the coolant in the first input channel 71 and the second input channel 72 are opposite. The coolant in the first input channel 71 flows along the first direction into the first shunt channel 61. After the coolant in the first shunt channel 61 enters each first cooling flow channel 2, the coolant in each first cooling flow channel 2 flows along the second direction. The coolant in the second input channel 72 flows along the second direction into the second shunt channel 62. After the coolant in the second shunt channel 62 enters each second cooling flow channel 3, the coolant in each second cooling flow channel flows along the first direction. In this way, by providing a single liquid inlet channel 70, it is possible to supply coolant to the first cooling flow channels 2 and the second cooling flow channels 3 respectively. That is, a liquid supply flow channel for liquid supply is provided at the end of the cooling plate body 1, and a liquid inlet channel 70 is connected to the liquid supply flow channel. The liquid supply flow channel is divided into a first input channel 71 and a second input channel 72 by using a single liquid inlet channel 70. When coolant is injected into the liquid inlet channel 70, after the coolant impacts the liquid supply flow channel, it flows along the first input channel 71 and the second input channel 72 respectively, thereby achieving the supply of coolant to the first cooling flow channels 2 and the second cooling flow channels 3 simultaneously by providing a single liquid inlet channel 70, and at the same time making the flow directions of the coolant in the first cooling flow channels 2 and the second cooling flow channels 3 opposite. Preferably, the liquid inlet channel 70 is connected to the middle position of the liquid supply flow channel to ensure uniform coolant flow rates in the first input channel 71 and the second input channel 72. It should be noted here that the first direction and the second direction are opposite directions.

[0037] Further, the battery pack further includes: a liquid outlet channel 80 provided on the cooling plate body 1; the liquid outlet of the first confluence channel 4 and the liquid outlet of the second confluence channel 5 are respectively connected to the liquid outlet channel 80. In this application, the liquid outlets of the first confluence channel 4 and the second confluence channel 5 are respectively connected to the liquid outlet channel 80, enabling the circulation of the coolant by using one liquid outlet channel 80 and one liquid inlet channel 70. Compared with the method of setting multiple liquid inlet channels and multiple liquid outlet channels in the prior art, this application has a simpler structure while achieving higher heat exchange efficiency of the coolant. Along the width direction of the cooling plate body 1, the cooling plate body 1 includes a relatively arranged third side end and a fourth side end. The liquid inlet channel 70 is provided at the third side end, and the liquid outlet channel 80 is provided at the fourth side end. The liquid inlet channel 70 is located at the middle position of the third side end, and the liquid outlet channel 80 is located at the middle position of the fourth side end. Compared with the technical solution of setting multiple liquid inlet channels 70 and multiple liquid outlet channels 80 according to the first confluence channel 4 and the second confluence channel 5, where there is no coolant flow in the space between each liquid inlet channel 70 and each liquid outlet channel 80, the above setting of this application can compensate for the space between each liquid inlet channel 70 and each liquid outlet channel 80, thereby increasing the flow area of the coolant and improving the cooling efficiency of the cooling plate body 1.

[0038] Specifically, the battery pack further includes: a first liquid outlet channel 81 and a second liquid outlet channel 82, the first liquid outlet channel 81 and the second liquid outlet channel 82 are respectively provided on the cooling plate body 1. The two ends of the first liquid outlet channel 81 are respectively connected to the liquid outlet channel 80 and the first confluence channel 4, and the two ends of the second liquid outlet channel 82 are respectively connected to the liquid outlet channel 80 and the second confluence channel 5; wherein, a first liquid outlet section 810 is provided at the liquid outlet end of the first liquid outlet channel 81, and a second liquid outlet section 820 is provided at the liquid outlet end of the second liquid outlet channel 82. The first liquid outlet section 810 and the second liquid outlet section 820 are respectively bent toward the liquid inlet direction of the liquid outlet channel 80, so that the outflow direction of the coolant in the first liquid outlet section 810 is the same as the outflow direction of the coolant in the second liquid outlet section 820. Taking the length direction or the width direction of the cooling plate body 1 as the transverse direction, the cross-sections of the first liquid outlet section 810 and the second liquid outlet section 820 are in a "V" - shaped structure. This makes the outflow directions of the first liquid outlet section 810 and the second liquid outlet section 820 the same, avoiding the problem of counter - flow when the two converge, increasing the flow resistance at the liquid outlet, and causing damage to the cooling plate body 1 during long - term operation.

[0039] Among them, the first liquid outlet channel 81 further includes a third liquid outlet section 811. The third liquid outlet section 811 extends in the horizontal direction, and the liquid outlet end of the third liquid outlet section 811 is connected to the first liquid outlet section 810. The first liquid outlet section 810 extends along a first arc trajectory, and the first liquid outlet section 810 has a first guiding side wall for guiding the coolant. The second liquid outlet channel 82 further includes a fourth liquid outlet section 821. The fourth liquid outlet section 821 extends in the horizontal direction, and the liquid outlet end of the fourth liquid outlet section 821 is connected to the second liquid outlet section 820. The second liquid outlet section 820 extends along a second arc trajectory, and the second liquid outlet section 820 has a second guiding side wall for guiding the coolant. The first guiding side wall is connected to the second guiding side wall, and the first guiding side wall and the second guiding side wall are respectively arc surfaces. In this way, under the guiding action of the first guiding side wall and the second guiding side wall, the coolant flows out in the same direction, and thus is discharged through the liquid outlet channel 80.

[0040] Preferably, the radius of the arc where the first guiding side wall is located is 0.5 mm to 1.5 mm, and the radius of the arc where the second guiding side wall is located is 0.5 mm to 1.5 mm. In this way, it will not occupy too large an area of the cooling plate body 1, and at the same time, it can play a good guiding role for the coolant.

[0041] In the specific implementation process, the cooling plate body 1 includes: a bottom plate 11, and each first cooling channel 2 and each second cooling channel 3 are respectively arranged on the bottom plate 11; a cover plate 12, which is buckled on the bottom plate 11, and the first confluence channel 4 and the second confluence channel 5 are arranged on the cover plate 12. Among them, a plurality of grooves are formed on the bottom plate 11. When the cover plate 12 is buckled on the bottom plate 11, each first cooling channel 2, each second cooling channel 3, the first diversion channel 61 and the second diversion channel 62 are formed in a sealed state to ensure the tightness of the coolant.

[0042] In order to confluence the coolant in each first cooling channel 2 and each second cooling channel 3, as Figure 3 shown, the battery pack further includes: a convex body 13, which is arranged on the cover plate 12, and the convex body 13 protrudes from the cover plate 12 in a direction away from the bottom plate 11; there are two convex bodies 13, so as to respectively form the first confluence channel 4 and the second confluence channel 5 between each convex body 13 and the cover plate 12. By providing two convex bodies 13, there is enough space on the cover plate 12 to arrange the first confluence channel 4 and the second confluence channel 5, avoiding the situation of mutual interference between the first confluence channel 4 and the second confluence channel 5 and the first diversion channel 61 and the second diversion channel 62, and ensuring the confluence of the coolant.

[0043] Among them, a plurality of first confluence ports 120 are provided on the cover plate 12, and each of the first confluence ports 120 is respectively connected to the first confluence flow channel 4. The plurality of first confluence ports 120 are provided corresponding to the plurality of first cooling flow channels 2 one by one. The coolant in each of the first cooling flow channels 2 flows into the first confluence flow channel 4 through each of the first confluence ports 120; a plurality of second confluence ports 121 are also provided on the cover plate 12, and each of the second confluence ports 121 is respectively connected to the second confluence flow channel 5. The plurality of second confluence ports 121 are provided corresponding to the plurality of second cooling flow channels 3 one by one. The coolant in each of the second cooling flow channels 3 flows into the second confluence flow channel 5 through each of the second confluence ports 121. By providing a plurality of first confluence ports 120, the coolant in each of the first cooling flow channels 2 flows into the first confluence flow channel 4 through the corresponding first confluence port 120 for confluence, realizing the circulation of the coolant in the first cooling flow channel 2. Similarly, the coolant in each of the second cooling flow channels 3 flows into the second confluence flow channel 5 through the corresponding second confluence port 121 for confluence, realizing the circulation of the coolant in the second cooling flow channel 3.

[0044] During actual use, the coolant flows into the first input channel 71 and the second input channel 72 respectively through the liquid inlet channel 70. After the coolant in the first input channel 71 flows into the first shunt channel 61, it is shunted into each of the first cooling flow channels 2. The coolant flows through the first cooling flow channel 2 along the second direction, flows into the first confluence flow channel 4 through the first confluence port 120 for confluence, and then flows into the liquid outlet channel 80 through the first liquid outlet flow channel 81; at the same time, after the coolant in the second input channel 72 flows into the second shunt channel 62, it is shunted into each of the second cooling flow channels 3. The coolant flows through the second cooling flow channel 3 along the first direction, flows into the second confluence flow channel 5 through the second confluence port 121 for confluence, and then flows into the liquid outlet channel 80 through the second liquid outlet flow channel 82. This design realizes countercurrent heat exchange between all adjacent flow channels. The heat exchange efficiency of countercurrent heat exchange is about 15% higher than that of concurrent heat exchange. At the same time, a plurality of first cooling flow channels 2 and a plurality of second cooling flow channels 3 are provided, which can efficiently realize the uniform distribution of the temperature of the battery cells, increasing the working efficiency and service life of the energy storage battery pack. Among them, the designs of the first shunt channel 61, the second shunt channel 62, the first confluence flow channel 4 and the second confluence flow channel 5 ensure that only one liquid inlet channel 70 and one liquid outlet channel 80 are provided in the whole structure, avoiding the redundant design of multiple liquid inlet channels and multiple liquid outlet channels.

[0045] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0046] According to the battery pack provided by the present application, it includes a battery body. The battery pack further includes a cooling plate body 1, a plurality of first cooling channels 2, a plurality of second cooling channels 3, a first confluence channel 4 and a second confluence channel 5. The cooling plate body 1 is in contact with the battery body. The plurality of first cooling channels 2 and the plurality of second cooling channels 3 are respectively arranged on the cooling plate body 1. The plurality of first cooling channels 2 and the plurality of second cooling channels 3 are alternately and spaced in sequence along the length direction or the width direction of the cooling plate body 1. The flow direction of the coolant in each first cooling channel 2 is opposite to the flow direction of the coolant in each second cooling channel 3. The first confluence channel 4 and the second confluence channel 5 are respectively arranged on the cooling plate body 1. The coolant in each first cooling channel 2 is discharged after being confluent through the first confluence channel 4. The liquid outlets of each second cooling channel 3 are respectively communicated with the second confluence channel 5. The coolant in each second cooling channel 3 is discharged after being confluent through the second confluence channel 5. Such a setting can avoid the situation that the temperature of the coolant at the rear end of the channel rises and the heat absorption efficiency decreases, resulting in uneven temperature distribution inside the battery pack. The coolant flows synchronously in each first cooling channel 2 and each second cooling channel 3, and a convection effect is formed in the first cooling channel 2 and the second cooling channel 3, uniformly absorbing heat inside the battery pack, thereby optimizing the heat dissipation effect of the battery pack and improving the working efficiency of the battery pack.

[0047] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A battery pack, comprising a battery body, characterized in that: The battery pack further includes: A cooling plate (1) is attached to the battery body to cool the battery body; A plurality of first cooling channels (2) are arranged on the cooling plate body (1); A plurality of second cooling channels (3) are arranged on the cooling plate body (1), the plurality of first cooling channels (2) and the plurality of second cooling channels (3) are arranged alternately and at intervals along the length direction or width direction of the cooling plate body (1), and the flow direction of the coolant in each of the first cooling channels (2) is opposite to the flow direction of the coolant in each of the second cooling channels (3); A first converging flow channel (4) is provided on the cooling plate body (1), wherein the liquid outlets of each of the first cooling flow channels (2) are respectively connected to the first converging flow channel (4), and the coolant in each of the first cooling flow channels (2) is discharged after converging through the first converging flow channel (4); A second converging flow channel (5) is provided on the cooling plate body (1), and the liquid outlets of each second cooling flow channel (3) are respectively connected to the second converging flow channel (5), and the coolant in each second cooling flow channel (3) is discharged after converging through the second converging flow channel (5); The battery pack further comprises: a first shunt channel (61), which is arranged on the cooling plate body (1), and the first shunt channel (61) extends along the width direction of the cooling plate body (1); a second shunt channel (62), which is arranged on an end of the cooling plate body (1) away from the first shunt channel (61), and the second shunt channel (62) extends along the width direction of the cooling plate body (1); A liquid inlet channel (70) is provided on the cooling plate body (1); a first input channel (71) is provided on the cooling plate body (1), one end of the first input channel (71) is communicated with the first shunt channel (61), and the other end of the first input channel (71) is communicated with the liquid inlet channel (70); a second input channel (72) is provided on the cooling plate body (1), one end of the second input channel (72) is communicated with the second shunt channel (62), and the other end of the second input channel (72) is communicated with the liquid inlet channel (70); the cooling liquid flows into the first input channel (71) and the second input channel (72) respectively through the liquid inlet channel (70); a liquid outlet channel (80) is provided on the cooling plate body (1); the liquid outlet of the first converging flow channel (4) and the liquid outlet of the second converging flow channel (5) are respectively communicated with the liquid outlet channel (80); The cooling plate body (1) comprises: a base plate (11), each of the first cooling channels (2) and each of the second cooling channels (3) being respectively arranged on the base plate (11); a cover plate (12), buckled on the base plate (11), and the first converging channel (4) and the second converging channel (5) being arranged on the cover plate (12); The battery pack further comprises: a protruding body (13) disposed on the cover plate (12), the protruding body (13) protruding relative to the cover plate (12) in a direction away from the bottom plate (11); there are two protruding bodies (13) so as to form the first converging flow channel (4) and the second converging flow channel (5) respectively between each protruding body (13) and the cover plate (12); the battery pack further comprises: a first liquid outlet flow channel (81) and a second liquid outlet flow channel (82); the liquid outlet end of the first liquid outlet flow channel (81) is provided with a first liquid outlet section (810), and the liquid outlet end of the second liquid outlet flow channel (82) is provided with a second liquid outlet section (820), the first liquid outlet section (810) and the second liquid outlet section (820) are respectively bent toward the liquid inlet direction of the liquid outlet channel (80), so that the cooling liquid in the first liquid outlet section (810) and the cooling liquid in the second liquid outlet section (820) flow out in the same direction; The first liquid outlet channel (81) further includes a third liquid outlet section (811), the third liquid outlet section (811) extending in a horizontal direction, the liquid outlet end of the third liquid outlet section (811) communicating with the first liquid outlet section (810), the first liquid outlet section (810) extending along a first arc-shaped trajectory, and the first liquid outlet section (810) having a first guide side wall for guiding the cooling liquid; The second liquid outlet channel (82) further includes a fourth liquid outlet section (821), the fourth liquid outlet section (821) extends in a horizontal direction, the liquid outlet end of the fourth liquid outlet section (821) is connected to the second liquid outlet section (820), the second liquid outlet section (820) extends along a second arc trajectory, the second liquid outlet section (820) has a second guide side wall for guiding the coolant, the first guide side wall is connected to the second guide side wall, and the first guide side wall and the second guide side wall are respectively arc surfaces.

2. The battery pack according to claim 1, wherein: Each of the first cooling channels (2) comprises: A first liquid inlet section (21), a first connecting section (23), and a first liquid discharge section (22) are sequentially connected, wherein the first liquid inlet section (21) and the first liquid discharge section (22) extend in a horizontal direction, and the first connecting section (23) extends along a wavy trajectory; and / or, Each of the second cooling channels (3) comprises: A second liquid inlet section (31), a second connecting section (33) and a second liquid discharge section (32) are sequentially connected, the second liquid inlet section (31) and the second liquid discharge section (32) respectively extending in a horizontal direction, and the second connecting section (33) extending along a wavy trajectory.

3. The battery pack according to claim 1, wherein: The plurality of first cooling channels (2) and the plurality of second cooling channels (3) are alternately and spaced apart in sequence along the width direction of the cooling plate (1); the battery pack further comprises: A first shunt channel (61) is provided on the cooling plate body (1), and the first shunt channel (61) extends along the width direction of the cooling plate body (1).

4. The battery pack according to claim 3, wherein: The battery pack further includes: A second shunt channel (62) is provided on an end of the cooling plate body (1) away from the first shunt channel (61), and the second shunt channel (62) extends along the width direction of the cooling plate body (1).

5. The battery pack according to claim 1, wherein: The battery pack further includes: A liquid outlet channel (80) is provided on the cooling plate body (1); The liquid outlet of the first converging flow channel (4) and the liquid outlet of the second converging flow channel (5) are respectively communicated with the liquid outlet channel (80).

6. The battery pack according to claim 5, characterized in that: The first liquid outlet channel (81) and the second liquid outlet channel (82) are respectively arranged on the cooling plate body (1); the two ends of the first liquid outlet channel (81) are respectively connected to the liquid outlet channel (80) and the first confluence channel (4); the two ends of the second liquid outlet channel (82) are respectively connected to the liquid outlet channel (80) and the second confluence channel (5).

7. The battery pack according to claim 1, wherein: The cover plate (12) is provided with a plurality of first confluence ports (120), each of the first confluence ports (120) is connected to the first confluence channel (4), and the plurality of first confluence ports (120) are provided in a one-to-one correspondence with the plurality of first cooling channels (2). The coolant in each of the first cooling channels (2) flows into the first confluence channel (4) through each of the first confluence ports (120); The cover plate (12) is further provided with a plurality of second confluence ports (121), each of which is connected to the second confluence channel (5), and the plurality of second confluence ports (121) are arranged in a one-to-one correspondence with the plurality of second cooling channels (3). The coolant in each of the second cooling channels (3) flows into the second confluence channel (5) through each of the second confluence ports (121).

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