Battery pack and electric device

Abstract

The utility model relates to battery technology field discloses a kind of battery pack and electrical equipment, battery pack includes box and the multiple battery monomers of being set in box, battery monomer arrangement is set in box, and the big face between adjacent battery monomer is equipped with heat exchange plate, heat exchange plate includes main plate body and current collector, multiple flow channel along the height direction of box arrangement is set in main plate body, flow channel includes upper region flow channel, middle region flow channel and lower region flow channel sequentially set from top to bottom along height direction, current collector is equipped with main inlet and main outlet, main inlet is communicated with the inlet end of middle region flow channel, the outlet end of middle region flow channel is communicated with the inlet end of upper region flow channel, lower region flow channel, the outlet end of upper region flow channel, lower region flow channel is communicated with main outlet.The battery pack and electrical equipment of the utility model, the heat exchange efficiency of middle region of the area biggest face of battery monomer is high, and heat exchange effect is good.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery pack and electrical equipment. Background Technology

[0002] A battery pack mainly consists of a connected housing and individual battery cells housed within the housing. During charging and discharging, each battery cell generates heat, causing its temperature to rise and affecting its normal operation. To cool the battery cells, a cold plate is placed next to the largest surface area of ​​each cell to dissipate heat. In existing technology, the flow channel at the edge of the cold plate is connected to the inlet of the current collector. The cooling medium enters from the edge channel, flows to the channel in the middle region of the cold plate, and finally exits from the channel at the other edge, completing the heat exchange for the battery cell. However, since the middle region of the largest surface area of ​​the battery cell is the main expansion area, the existing cold plate flow channel design results in poor heat exchange in this region, failing to meet the heat exchange requirements of the largest surface area of ​​the battery cell. Utility Model Content

[0003] In view of this, the present invention provides a battery pack in which the heat exchange efficiency of the middle area of ​​the largest surface of the battery cell is high and the heat exchange effect is good, thereby reducing the probability of expansion and deformation of the middle area of ​​the largest surface of the battery cell due to temperature rise.

[0004] This utility model also provides an electrical device.

[0005] To achieve the above objectives, in a first aspect, this utility model provides the following technical solution:

[0006] A battery pack includes a housing and a plurality of battery cells disposed within the housing. The battery cells are arranged in a specific order within the housing. A heat exchange plate is provided between the large surfaces of adjacent battery cells. The heat exchange plate includes a main body and a current collector. The main body has a plurality of flow channels arranged along the height direction of the housing. The flow channels include an upper region flow channel, a middle region flow channel, and a lower region flow channel arranged sequentially from top to bottom along the height direction. The current collector has a main inlet and a main outlet. The main inlet is connected to the inlet end of the middle region flow channel. The outlet end of the middle region flow channel is connected to the inlet ends of the upper region flow channel and the lower region flow channel. The outlet ends of the upper region flow channel and the lower region flow channel are connected to the main outlet.

[0007] As can be seen from the above technical solution, the battery pack provided by this utility model connects the main inlet of the heat exchange plate to the inlet end of the intermediate flow channel, the outlet end of the intermediate flow channel to the inlet ends of the upper and lower flow channels, and the outlet ends of the upper and lower flow channels to the main outlet. This allows the cooling fluid in the heat exchange plate to enter the intermediate flow channel located in the middle region of the heat exchange plate from the main inlet of the collector, and then flow out to the main outlet from the flow channels located on both sides of the heat exchange plate along the height direction. The flow channels on both sides of the heat exchange plate along the height direction include the upper flow channel and the lower flow channel. That is, the cooling fluid with a lower temperature first passes through the intermediate flow channel with a higher cooling demand, and then passes through the edge region with a lower cooling demand. This ensures the heat exchange requirements of the middle region of the large surface area of ​​the corresponding battery cell. The heat exchange efficiency of the middle region of the largest surface area of ​​the battery cell is high, and the heat exchange effect is good. This reduces the probability of the middle region of the largest surface area of ​​the battery cell expanding and deforming due to temperature rise.

[0008] Secondly, this utility model also provides an electrical device, including a battery pack, wherein the battery pack is the aforementioned battery pack.

[0009] The electrical equipment of this utility model includes the aforementioned battery pack, and therefore has the advantages of the aforementioned battery pack, which will not be elaborated here. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the battery pack provided in an embodiment of the present utility model;

[0012] Figure 2 A schematic diagram of the connection structure between the heat exchange plate and the battery cell provided in an embodiment of this utility model;

[0013] Figure 3 A schematic diagram of the heat exchange plate at one angle provided in an embodiment of this utility model;

[0014] Figure 4 This is a structural schematic diagram of the heat exchange plate provided in another embodiment of the present utility model;

[0015] Figure 5 for Figure 4 A cross-sectional view of the AA position in the diagram;

[0016] Figure 6 This is a structural schematic diagram of the heat exchange plate provided in another embodiment of the present utility model;

[0017] Figure 7 for Figure 6 A cross-sectional view of the BB position in the diagram;

[0018] Figure 8 A partial cross-sectional view of the location of the second guide section provided in an embodiment of the present utility model;

[0019] Figure 9 A schematic diagram of the partitioned structure of the internal flow channel of the heat exchange plate provided in an embodiment of this utility model;

[0020] Figure 10 A schematic diagram of the flow of cooling fluid within a heat exchange plate provided in an embodiment of this utility model;

[0021] Figure 11 A schematic diagram of the spacing structure of the internal flow channels of the heat exchange plate provided in an embodiment of this utility model;

[0022] Figure 12 This is a schematic diagram of the structure of a battery cell provided in an embodiment of the present invention.

[0023] in:

[0024] 1. Housing; 2. Battery cell; 201. Large surface; 3. Heat exchange plate; 301. Main cold plate; 3011. First manifold; 3012. Second manifold; 3013. Main inlet; 3014. Main outlet; 3015. First guide section; 3016. Second guide section; 30161. First guide rib; 30162. Second guide rib; 3017. First branch channel; 3018. Second branch channel; 3019. Third branch channel; 30110. First return channel; 30111. Second return channel; 30112. Channel partition wall; 302. Top cold plate; 303. Bottom cold plate; 3031. Clearance opening; 3032. Bottom cooling channel. Detailed Implementation

[0025] This utility model discloses a battery pack in which the heat exchange efficiency of the middle area of ​​the largest surface of the battery cell is high and the heat exchange effect is good, reducing the probability of expansion and deformation of the middle area of ​​the largest surface of the battery cell due to temperature rise.

[0026] This utility model also discloses an electrical device.

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] A battery pack comprises a battery array consisting of multiple battery cells connected in series and / or parallel, a battery management system (BMS), a thermal management system, an electrical connection system (high-voltage / low-voltage connectors, wiring harnesses, etc.), structural components (casing, brackets, etc.), and protective parts. These components are housed within a casing and sealed with a cover, forming a complete functional unit capable of directly outputting electrical energy. As a rechargeable battery, the battery pack is the power source for new energy vehicles. The battery pack includes a casing and multiple battery cells housed within it.

[0029] A single battery cell typically includes a battery casing, a cell body, an adapter plate, and an electrolyte. The battery casing houses the cell body and the electrolyte, and generally includes a casing body and a cover plate. At least one positive electrode post and at least one negative electrode post are disposed on the casing and / or the cover plate. The cell body includes one or more electrode assemblies, which are formed by stacking or winding positive electrode plates, negative electrode plates, and a separator. The separator is located between adjacent positive and negative electrode plates to insulate them. At least one end of the electrode assembly has a tab, and one end of the adapter plate is electrically connected to the tab, while the other end is electrically connected to the electrode post.

[0030] The enclosure refers to a closed or semi-closed structure made of materials such as metal and plastic. It serves as the physical carrier of the battery pack, and its design and manufacturing must meet the safety, reliability, and functionality requirements of the battery pack under different usage scenarios. The enclosure provides installation space for the battery pack, BMS, cooling system, electrical connection components, etc., and through a reasonable structural design, fixes these components within the enclosure, ensuring they maintain a relatively stable position during battery pack operation and preventing damage or loosening of connections due to vibration, impact, or other factors. The battery pack enclosure generally consists of an upper enclosure and a lower enclosure. The lower enclosure typically has four side panels and a bottom plate. The four side panels can be integrally formed with the bottom plate or manufactured using a separate, fixed connection method. The enclosure can be cast from materials such as steel plates and aluminum alloys, or lightweight materials such as glass fiber reinforced composite materials and carbon fiber reinforced composite materials. The shape of the enclosure can be cylindrical, cuboid, cube, etc.

[0031] To regulate the temperature of individual battery cells, a heat exchange plate is installed inside the casing. The heat exchange plate contains heat exchange channels for the flow of a heat exchange medium. This medium can be a gas (air), a liquid (such as water, alcohol, refrigerant, oil, etc.), or a solid (such as thermally conductive adhesive, thermally conductive solder paste, etc.). The heat exchange channels have inlets and outlets. The heat exchange medium enters the channels through the inlet, exchanges heat with the battery cells, and then exits through the outlet, thus achieving heat exchange between the battery cells. The heat exchange plate can exchange heat with the battery cells and can be made of materials with high thermal conductivity, such as copper.

[0032] See Figures 1 to 12 The battery pack of this utility model includes a housing 1 and a plurality of battery cells 2 disposed within the housing 1. The battery cells 2 are arranged in a specific pattern within the housing 1. A heat exchange plate 3 is provided between the large surfaces 201 of adjacent battery cells 2. Since the surface with the largest area of ​​the battery cell 2 has the highest probability of deformation when the temperature rises, the large surface 201 is the surface with the largest area of ​​the battery cell 2. The heat exchange plate 3 includes a main body and a collector. The main body is provided with a plurality of flow channels arranged along the height direction of the housing 1. The flow channels include an upper region flow channel Z1, a middle region flow channel Z2 and a lower region flow channel Z3 arranged sequentially from top to bottom along the height direction. The collector is provided with a main inlet 3013 and a main outlet 3014. The main inlet 3013 is connected to the inlet end of the middle region flow channel Z2. The outlet end of the middle region flow channel Z2 is connected to the inlet ends of the upper region flow channel Z1 and the lower region flow channel Z3. The outlet ends of the upper region flow channel Z1 and the lower region flow channel Z3 are connected to the main outlet 3014.

[0033] The upper region flow channel Z1, the middle region flow channel Z2, or the lower region flow channel Z3 each include at least one flow channel. The number of flow channels in the three regions can be the same or different. For example... Figure 9 As shown, the upper region flow channel Z1, the middle region flow channel Z2, and the lower region flow channel Z3 are each provided with four flow channels. Figure 9 The upper region flow channel Z1 is enclosed by a dashed line frame, the middle region flow channel Z2 is enclosed by a thick solid line frame, and the lower region flow channel Z3 is enclosed by a dotted frame.

[0034] The battery pack of this utility model connects the main inlet 3013 of the heat exchange plate 3 to the inlet end of the intermediate region flow channel Z2, the outlet end of the intermediate region flow channel Z2 to the inlet ends of the upper region flow channel Z1 and the lower region flow channel Z3, and the outlet ends of the upper region flow channel Z1 and the lower region flow channel Z3 to the main outlet 3014. This allows the cooling fluid within the heat exchange plate 3 to enter the intermediate region flow channel Z2 located in the middle region of the heat exchange plate 3 from the main inlet 3013, and then flow from the channels located on both sides of the height direction of the heat exchange plate 3. The flow path of the heat exchange plate 3 along the two sides of the height direction to the main outlet 3014 includes the upper region flow path Z1 and the lower region flow path Z3. That is, the cooling fluid with low temperature first passes through the middle region flow path Z2 with high cooling demand, and then passes through the edge region with low cooling demand. This ensures the heat exchange requirements of the middle region of the large surface 201 of the corresponding battery cell 2. The heat exchange efficiency of the middle region of the largest surface of the battery cell 2 is high and the heat exchange effect is good, which reduces the probability of the middle region of the largest surface of the battery cell 2 expanding and deforming due to temperature rise.

[0035] To ensure reliable cooling fluid inlet to the upper region flow channel Z1 and the lower region flow channel Z3, the intermediate region flow channel Z2 includes at least two spaced-apart first branch channels 3017. One first branch channel 3017 is located near the upper region flow channel Z1, and the other is located near the lower region flow channel Z3. The end of each first branch channel 3017 communicates with both the upper region flow channel Z1 and the lower region flow channel Z3. The end of the first branch channel 3017 refers to the end of the first branch channel 3017 furthest from the main inlet 3013. By dividing the intermediate region flow channel Z2 into multiple first branch channels 3017, the incoming cooling fluid is more evenly distributed, and the distribution of cooling fluid from the intermediate region flow channel to the two edge region flow channels is more uniform.

[0036] To ensure effective heat dissipation of the heat exchange plate 3 to the large surface 201 of the battery cell 2, the projected area of ​​the flow channel Z2 in the middle region onto the large surface 201 of the battery cell 2 is A1 mm. 2 That is, A1 mm 2 for Figure 9 The area enclosed by the thick solid line frame is A2 mm. The orthographic projection area of ​​the main body onto the large surface 201 of the battery cell 2 is A2 mm. 2 That is, A2 mm 2 for Figure 9The ratio A1 / A2 is the sum of the areas enclosed by the thick solid line frame, the dashed line frame, and the dotted frame. The range of A1 / A2 is 0.1-0.66. Setting the ratio within this range satisfies both the heat dissipation needs of the central expansion area of ​​the large surface 201 of the battery cell 2 and the heat dissipation needs of the edge area along the height direction of the large surface 201 of the battery cell 2, ensuring the heat dissipation needs of the central area of ​​the large surface 201 and making the heat dissipation of the entire large surface 201 more uniform. If the ratio of A1 / A2 is too small, the heat dissipation of the central expansion area of ​​the large surface 201 of the battery cell 2 will be insufficient; if the ratio is too large, it will affect the flow of cooling fluid in the edge area of ​​the heat exchange plate 3. Specifically, A1 / A2 can be any value from 0.1, 0.25, 0.3, 0.45, 0.5, 0.66, or a value between any two values.

[0037] Specifically, the distance from the side of the intermediate flow channel Z2 near the top of the motherboard to the top of the motherboard is L1 mm, as shown below. Figure 11 As shown, L1mm ranges from 10 to 80 mm. Setting L1 within this range ensures not only the heat dissipation needs of the central area of ​​the large surface 201 but also the smooth flow of cooling fluid in the upper region's flow channel Z1. If L1 is too large, it will affect the area of ​​the central flow channel Z2, resulting in poor heat dissipation for the central expansion area of ​​the large surface 201 of the battery cell 2. If L1 is too small, it will affect the flow of cooling fluid in the upper region's flow channel Z1. Specifically, L1mm can be any value from 10mm, 18mm, 30mm, 45mm, 70mm, 80mm, etc., or a value between any two of these.

[0038] Furthermore, the distance from the side of the intermediate flow channel Z2 near the bottom of the main board to the bottom of the main board is L2 mm, and the range of L2 mm is 10-80 mm. Setting L2 within this range not only ensures the heat dissipation needs of the intermediate area of ​​the large surface 201, but also ensures the smooth flow of cooling fluid in the lower flow channel Z3. If L2 is too large, it will affect the area of ​​the intermediate flow channel Z2, resulting in poor heat dissipation for the central expansion area of ​​the large surface 201 of the battery cell 2; if L2 is too small, it will affect the flow of cooling fluid in the lower flow channel Z3. Specifically, L2 mm can be any value from 10 mm, 18 mm, 30 mm, 45 mm, 70 mm, 80 mm, or a value between any two of these.

[0039] In one embodiment, the range of L1 / L2 is 0.13-8. By limiting the value of L1 / L2, the width range of the upper region flow channel Z1 and the lower region flow channel Z3 along the height direction of the housing 1 is within the set range, ensuring the uniformity of heat dissipation for the large surface 201 of the battery cell 2. If the value of L1 / L2 is too large, the middle region flow channel Z2 will be closer to the bottom of the main body, which will prevent the middle region flow channel Z2 from completely covering the middle region of the large surface 201 of the battery cell 2, thus failing to guarantee the cooling of the middle region of the large surface 201 and making it difficult to guarantee the cooling effect. Similarly, if the value of L1 / L2 is too small, the middle region flow channel Z2 will be closer to the top of the main body, which will also prevent the middle region flow channel Z2 from completely covering the middle region of the large surface 201 of the battery cell 2, thus failing to guarantee the cooling of the middle region of the large surface 201 and making it difficult to guarantee the cooling effect. Specifically, L1 / L2 can be any value from 0.13, 1.5, 3, 5, 6.5, 8, etc., or a value between any two values.

[0040] In one embodiment, the upper region flow channel Z1 includes at least one second branch channel 3018, which communicates with the first branch channel 3017. A portion of the cooling fluid from the first branch channel 3017 flows out through the second branch channel 3018. The projected area of ​​all second branch channels 3018 onto the large surface 201 of the battery cell 2 is A3 mm. 2 ,like Figure 9 As shown, this represents the area of ​​all flow channels within the area enclosed by the dotted line box. The orthographic projection area of ​​all first branch channels 3017 onto the large surface 201 of the battery cell 2 is A4 mm. 2 ,like Figure 9 As shown, this represents the area of ​​all flow channels within the region enclosed by the thick solid line frame. The range of A3 / A4 is 0.5-1.5. Specifically, A3 / A4 can be any value from 0.5, 0.75, 1, 1.2, 1.3, 1.5, or a value between any two of these. By setting the range of A3 / A4 within the above range, the heat dissipation effect on the large surface 201 can be guaranteed.

[0041] Preferably, since the cold zone fluid first flows through the middle region flow channel Z2 and then flows through the upper region flow channel Z1 after heat exchange, in order to ensure the uniformity of heat exchange of the heat exchange plate 3, A3 > A4, so as to compensate for the influence of the temperature change of the cooling fluid on the heat dissipation effect of different regions of the large surface 201.

[0042] In another embodiment, the lower region flow channel Z3 includes at least one third branch channel 3019, which communicates with the first branch channel 3017, and a portion of the cooling fluid from the first branch channel 3017 flows out through the third branch channel 3019. The projected area of ​​all the third branch channels 3019 onto the large surface 201 of the battery cell 2 is A5 mm.2 ,like Figure 9 As shown, this represents the area of ​​all flow channels within the region enclosed by the dotted frame. The orthographic projection area of ​​the first branch channel 3017 onto the large surface 201 of the battery cell 2 is A4 mm. 2 ,like Figure 9 As shown, this represents the area of ​​all flow channels within the region enclosed by the thick solid line frame. The range of A5 / A4 is 0.5-1.5. Specifically, A5 / A4 can be any value from 0.5, 0.75, 1, 1.2, 1.3, 1.5, or a value between any two values.

[0043] Preferably, since the cold zone fluid first flows through the middle region flow channel Z2 and then flows through the lower region flow channel Z3 after heat exchange, in order to ensure the uniformity of heat exchange of the heat exchange plate 3, A5 > A4, so as to compensate for the influence of the temperature change of the cooling fluid on the heat dissipation effect of different regions of the large surface 201.

[0044] Specifically, the current collector includes a first manifold 3011 and a second manifold 3012. In one embodiment, the first manifold 3011 and the second manifold 3012 are respectively disposed on both sides of the main board body along its length, such as... Figure 5 As shown, the first manifold 3011 is provided with a main inlet 3013, and the second manifold 3012 is provided with a main outlet 3014. The first manifold 3011 is connected to the intermediate region channel Z2, and the second manifold 3012 is connected to the upper region channel Z1 and the lower region channel Z3. In another embodiment, the first manifold 3011 and the second manifold 3012 are located on the same side of the main body along its length (not shown in the figure). The first manifold 3011 is provided with a main inlet 3013, and the second manifold 3012 is provided with a main outlet 3014. The first manifold 3011 is connected to the intermediate region channel Z2, and the second manifold 3012 is connected to the upper region channel Z1 and the lower region channel Z3.

[0045] To guide the cooling fluid flowing from the first manifold 3011 to the intermediate flow channel Z2, a first guide section 3015 is provided within the chamber of the first manifold 3011 to guide the fluid to the intermediate flow channel Z2, such as... Figure 5 As shown. By setting the first guide section 3015 to guide the cooling fluid, the cooling fluid is prevented from flowing directly into the upper region flow channel Z1, the lower region flow channel Z3 or the main outlet 3014 without passing through the middle region flow channel Z2.

[0046] The first guide section 3015 has two parts, such as... Figure 5 , Figure 9 and Figure 10As shown, two first flow guides 3015 are spaced apart. One first flow guide 3015 is located between the upper region flow channel Z1 and the middle region flow channel Z2, separating the beginning of the middle region flow channel Z2 from the end of the upper region flow channel Z1. The other first flow guide 3015 is located between the lower region flow channel Z3 and the middle region flow channel Z2, separating the beginning of the middle region flow channel Z2 from the end of the lower region flow channel Z3. This ensures that the cooling fluid flows from the middle region to the edge region, improving the heat dissipation efficiency of the middle region of the large surface 201. The aforementioned beginning and end are defined according to the flow direction of the cooling fluid; the position reached by the cooling fluid first is the beginning, and the position reached later is the end.

[0047] To ensure effective heat dissipation, the distance between the two first airflow guides 3015 is L3 mm, such as... Figure 11 As shown, L3mm ranges from 4 to 25mm. Since the distance between the two first guide sections 3015 is the width of the liquid inlet opening at the beginning of the middle flow channel Z2, limiting the value of L3 within the above range ensures the heat dissipation effect in the middle region without affecting the flow of cooling fluid in the edge flow channels, thus ensuring the heat dissipation effect at the edges and making the heat dissipation uniformity of the large surface 201 of the battery cell 2 better. If the value of L3 is too large, that is, the distance between the two first guide sections 3015 is too large, it will affect the flow of the edge flow channels of the upper region flow channel Z1 and the lower region flow channel Z3 of the heat exchange plate 3. If the value of L3 is too small, the heat dissipation effect in the middle region of the heat exchange plate 3 will be poor. Specifically, L3mm can be any value among 4mm, 8.5mm, 12mm, 17mm, 20mm, 25mm, etc., or a value between any two values.

[0048] The intermediate flow channel Z2 includes several spaced first branch channels 3017. The extension direction of the first guide section 3015 is parallel to the extension direction of the first branch channels 3017, so as to facilitate the introduction of cooling fluid into the first branch channels 3017 as soon as possible and improve heat dissipation efficiency.

[0049] To direct the cooling fluid from the end of the intermediate region flow channel Z2 into the upper region flow channel Z1 and the lower region flow channel Z3 respectively, a second flow guide 3016 is provided in the chamber of the second distribution fluid 3012, such as... Figure 8As shown, the second flow guide 3016 includes a first flow guide rib 30161 and a second flow guide rib 30162 connected together. The first flow guide rib 30161 extends from the end of the intermediate region flow channel Z2 to the beginning of the upper region flow channel Z1. The first flow guide rib 30161 and the end of the flow channel partition wall 30112 at the corresponding position are spaced at a set distance to form a first flow path. The first flow path connects the intermediate region flow channel Z2 and the upper region flow channel Z1. The intermediate region flow channel Z2 is connected to the upper region flow channel Z1 via the first flow path. The second flow guide rib 30162 extends from the end of the middle region flow channel Z2 to the beginning of the lower region flow channel Z3. The second flow guide rib 30162 and the end of the flow channel partition wall 30112 at the corresponding position are spaced at a set distance to form a second flow path. The second flow path connects the middle region flow channel Z2 and the lower region flow channel Z3. The middle region flow channel Z2 is connected to the lower region flow channel Z3 through the second flow path.

[0050] To facilitate the flow of cooling fluid from the lower region flow channel Z3 and the upper region flow channel Z1 to the main outlet 3014, the first guide rib 30161 is spaced apart from the sidewall of the second distribution flow channel 3012 to form a first return channel 30110. The inlet end of the first return channel 30110 is connected to the end of the upper region flow channel Z1, and the outlet end of the first return channel 30110 is connected to the main outlet 3014. Figure 8 As shown, the first return channel 30110 and the first serial flow path are respectively located on both sides of the first guide rib 30161.

[0051] Similarly, the surface of the second guide rib 30162 away from the flow channel is spaced apart from the sidewall of the second distribution manifold 3012 to form a second return channel 30111. The inlet end of the second return channel 30111 is connected to the end of the lower region flow channel Z3, and the outlet end of the second return channel 30111 is connected to the main outlet 3014. Figure 8 As shown, the second return channel 30111 and the second serial flow path are respectively located on both sides of the second guide rib 30162. The flow path of the cooling fluid in the flow channel of the heat exchange plate 3 is shown in the figure. Figure 10 As shown, Figure 10 The arrows in the diagram indicate the flow direction of each channel.

[0052] The extension lengths of the first flow guide rib 30161 and the second flow guide rib 30162 may be the same or different, depending on the actual usage requirements, and are not limited here.

[0053] To improve the heat dissipation efficiency of the bottom surface of the battery cell 2, the main body includes a main cooling plate 301 arranged parallel to the large surface 201, and a bottom cooling plate 303 is provided at one end of the main cooling plate 301 near the bottom of the housing 1, such as... Figure 3 As shown, the bottom cooling plate 303 is perpendicular to the main cooling plate 301, which facilitates the arrangement of the battery cells 2 on the bottom cooling plate 303. The bottom cooling plate 303 is in direct or indirect contact with the bottom surface of the battery cells 2, which facilitates heat dissipation from the bottom surface of the battery cells 2. Furthermore, the bottom cooling plate 303 is provided with a bottom cooling channel 3032, and a cooling medium is introduced into the bottom cooling channel 3032, which improves the heat dissipation performance of the bottom surface of the battery cells 2.

[0054] To improve the heat dissipation efficiency of the top surface of the battery cell 2, a top cooling plate 302 is provided at the end of the main cooling plate 301 away from the bottom of the casing 1, such as... Figure 3 As shown, the top cooling plate 302 is arranged perpendicularly to the main cooling plate 301, and the top cooling plate 302 is in direct or indirect contact with the top surface of the battery cell 2, which facilitates heat dissipation from the top surface of the battery cell 2.

[0055] To improve the support stability of the battery cell 2 and enhance heat dissipation performance, while preventing the top cooling plate 302 from affecting the placement of components such as the terminal posts at the top of the battery cell 2, the width of the top cooling plate 302 is W1 mm, and the width of the bottom cooling plate 303 is W2 mm, with W1 being smaller than W2. Figure 7 As shown.

[0056] To quickly expel gases and other substances generated during thermal runaway of battery cell 2, an explosion-proof valve (not shown in the figure) is installed at the bottom of battery cell 2. To avoid obstructing the explosion-proof valve, a clearance opening 3031 is provided at the edge of the bottom cooling plate 303 away from the main cooling plate 301, such as... Figure 3 and Figure 4 As shown, the clearance opening 3031 is provided corresponding to the explosion-proof valve.

[0057] In this battery pack, the main inlet 3013 of the current collector is connected to the flow channel Z2 in the middle region of the heat exchange plate 3. The cooling fluid flows out through the upper region flow channel Z1 and the lower region flow channel Z3 on both sides of the heat exchange plate 3 in the height direction. By rearranging the flow channels, the cooling fluid is ensured to enter from the flow channel in the center region of the plate and flow out from the edge regions on both sides of the plate, ensuring good heat exchange efficiency in the middle region of the large surface 201 of the battery cell 2 and meeting the heat dissipation requirements of the large surface.

[0058] This utility model also discloses an electrical device, including a battery pack, wherein the battery pack is the aforementioned battery pack.

[0059] In the description of this solution, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this solution, "multiple" means two or more, unless otherwise explicitly specified.

[0060] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0061] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery pack, characterized in that, The device includes a housing and multiple battery cells disposed within the housing. The battery cells are arranged in a specific pattern within the housing. A heat exchange plate is provided between the large surfaces of adjacent battery cells. The heat exchange plate includes a main body and a current collector. The main body has multiple flow channels arranged along the height direction of the housing. The flow channels include an upper region flow channel, a middle region flow channel, and a lower region flow channel arranged sequentially from top to bottom along the height direction. The current collector has a main inlet and a main outlet. The main inlet is connected to the inlet end of the middle region flow channel. The outlet end of the middle region flow channel is connected to the inlet ends of the upper and lower region flow channels. The outlet ends of the upper and lower region flow channels are connected to the main outlet.

2. The battery pack according to claim 1, characterized in that, The intermediate region flow channel includes at least two spaced-apart first branch channels, one of which is located near the upper region flow channel and the other is located near the lower region flow channel. The end of each of the first branch channels is connected to the upper region channel and the lower region channel.

3. The battery pack according to claim 2, characterized in that, The projected area of ​​the flow channel in the intermediate region facing the large surface of the battery cell is A1 mm. 2 The projected area of ​​the mainboard body facing the large surface of the battery cell is A2mm². 2 The range of A1 / A2 is 0.1-0.

66.

4. The battery pack according to any one of claims 1 or 2, characterized in that, The distance from the side of the flow channel in the middle region near the top of the motherboard to the top of the motherboard is L1 mm, and the range of L1 mm is 10 mm to 80 mm.

5. The battery pack according to claim 4, characterized in that, The distance from the side of the flow channel in the middle region near the bottom of the motherboard to the bottom of the motherboard is L2 mm, and the range of L2 mm is 10 mm to 80 mm.

6. The battery pack according to claim 5, characterized in that, The L1 / L2 ratio ranges from 0.13 to 8.

7. The battery pack according to claim 2, characterized in that, The upper region flow channel includes at least one second branch channel, which is connected to the first branch channel; The projected area of ​​all the second shunt channels facing the large surface of the battery cell is A3 mm. 2 The projected area of ​​all the first shunt channels facing the large surface of the battery cell is A4 mm. 2 The range of A3 / A4 is 0.5-1.

5.

8. The battery pack according to claim 2, characterized in that, The lower region flow channel includes at least one third branch channel, which is connected to the first branch channel; The projected area of ​​all the third shunt channels facing the large surface of the battery cell is A5 mm. 2 The projected area of ​​all the first shunt channels facing the large surface of the battery cell is A4 mm. 2 The range for A5 / A4 is 0.5-1.

5.

9. The battery pack according to claim 1, characterized in that, The current collector includes a first manifold and a second manifold, which are respectively located on both sides of the main body along its length. The first manifold is provided with the main inlet, and the second manifold is provided with the main outlet. The first manifold fluid is connected to the intermediate region channel, and the second manifold fluid is connected to the upper region channel and the lower region channel.

10. The battery pack according to claim 1, characterized in that, The current collector includes a first manifold and a second manifold, which are located on the same side of the main body along its length. The first manifold has the main inlet, and the second manifold has the main outlet. The first manifold fluid is connected to the intermediate region channel, and the second manifold fluid is connected to the upper region channel and the lower region channel.

11. The battery pack according to any one of claims 9 or 10, characterized in that, The first fluid distribution chamber is provided with a first guide section for guiding the fluid to the flow channel of the intermediate region.

12. The battery pack according to claim 11, characterized in that, There are two first flow guides, which are spaced apart. One first flow guide is located between the upper region flow channel and the middle region flow channel, and the other first flow guide is located between the lower region flow channel and the middle region flow channel.

13. The battery pack according to claim 12, characterized in that, The distance between the two first guide sections is L3mm, and the range of L3mm is 4mm-25mm.

14. The battery pack according to claim 12, characterized in that, The intermediate region flow channel includes several spaced-apart first branch channels, and the extension direction of the first guide portion is parallel to the extension direction of the first branch channels.

15. The battery pack according to claim 9, characterized in that, The chamber of the second distribution fluid is provided with a second flow guide, which includes a first flow guide rib and a second flow guide rib connected together. The first flow guide rib extends from the end of the middle region flow channel to the beginning of the upper region flow channel. The first flow guide rib and the end of the flow channel partition wall at the corresponding position are spaced at a set distance to form a first flow path. The first flow path connects the middle region flow channel and the upper region flow channel. The second flow guide rib extends from the end of the middle region flow channel to the beginning of the lower region flow channel. The second flow guide rib and the end of the flow channel partition wall at the corresponding position are spaced at a set distance to form a second flow path. The second flow path connects the middle region flow channel and the lower region flow channel.

16. The battery pack according to claim 15, characterized in that, The surface of the first guide rib away from the flow channel is spaced apart from the side wall of the second distribution fluid to form a first return channel. The inlet end of the first return channel is connected to the end of the upper region flow channel, and the outlet end of the first return channel is connected to the main outlet.

17. The battery pack according to claim 15, characterized in that, The second flow guide rib is spaced apart from the flow channel on its side and the side wall of the second flow distribution fluid to form a second return channel. The inlet end of the second return channel is connected to the end of the flow channel in the lower region, and the outlet end of the second return channel is connected to the main outlet.

18. The battery pack according to claim 15, characterized in that, The first and second flow guiding ribs may have the same or different extension lengths.

19. The battery pack according to claim 1, characterized in that, The main body includes a main cooling plate arranged parallel to the large surface, and a bottom cooling plate is provided at one end of the main cooling plate near the bottom of the housing. The bottom cooling plate is arranged perpendicular to the main cooling plate, and the battery cells are arranged on the bottom cooling plate.

20. The battery pack according to claim 19, characterized in that, A top cooling plate is provided at one end of the main cooling plate away from the bottom of the housing. The top cooling plate is perpendicular to the main cooling plate and contacts the top surface of the battery cell.

21. The battery pack according to claim 20, characterized in that, Along the direction perpendicular to the large surface, the width of the top cold plate is W1 mm, and the width of the bottom cold plate is W2 mm, where W1 is less than W2.

22. The battery pack according to claim 19, characterized in that, An explosion-proof valve is provided at the bottom of the battery cell, and a clearance opening is provided at the edge of the bottom cold plate away from the main cold plate, with the clearance opening corresponding to the explosion-proof valve.

23. The battery pack according to claim 19, characterized in that, The bottom cooling plate is provided with bottom cooling channels.

24. An electrical device, comprising a battery pack, characterized in that, The battery pack is the battery pack according to any one of claims 1-23.

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