Battery protection plate, battery pack and vehicle

Abstract

This invention discloses a battery guard plate, a battery pack, and a vehicle. The battery guard plate includes: a heat spreader plate with an exhaust port for avoiding an explosion-proof valve; and a flow channel plate connected to the heat spreader plate and jointly defining a spaced-apart cooling flow channel and an exhaust channel, the exhaust channel communicating with the exhaust port. According to the battery guard plate of this invention, the gas ejected after the explosion-proof valve is opened can be smoothly discharged, and the high-temperature gas ejected can be cooled, thereby improving the thermal safety of the battery pack and ensuring the safe and efficient operation of the battery pack.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a battery guard plate, a battery pack including the battery guard plate, and a vehicle including the battery pack. Background Technology

[0002] The power batteries in electric vehicles have stringent temperature requirements. Prolonged operation under high or low temperatures will reduce the performance and lifespan of the power batteries, and may even pose significant safety hazards. Therefore, maintaining the operating temperature of power batteries within a suitable range is a current pain point in the industry.

[0003] In related technologies, in order to improve the performance of the battery cell, the explosion-proof valve of the battery cell is set at the bottom of the battery cell. However, this will hinder the opening of the valve and the venting of the battery cell, and affect the overall safety of the battery. Summary of the Invention

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a battery protection plate that can facilitate the smooth discharge of gas ejected after the explosion-proof valve is opened, and can also cool the ejected high-temperature gas, thereby improving the thermal safety of the battery pack and ensuring its safe and efficient operation.

[0005] According to an embodiment of the present invention, a battery protection plate includes: a heat spreader plate, the heat spreader plate having an exhaust port for avoiding an explosion-proof valve; and a flow channel plate, the flow channel plate being connected to the heat spreader plate and jointly defining a spaced-apart cooling flow channel and an exhaust channel, the exhaust channel being in communication with the exhaust port.

[0006] According to the battery protection plate of the present invention, by providing an exhaust port for avoiding the explosion-proof valve and an exhaust channel communicating with the exhaust port, interference between the explosion-proof valve and the battery protection plate is avoided, and the gas ejected after the explosion-proof valve is opened can be smoothly discharged. At the same time, a cooling channel spaced apart from the exhaust channel is provided, which can cool the battery and the ejected high-temperature gas, thereby improving the thermal safety of the battery pack and ensuring the safe and efficient operation of the battery pack.

[0007] According to some embodiments of the present invention, the flow channel plate has an exhaust groove formed on the side facing the heat spreader, and the heat spreader and the flow channel plate define the exhaust channel at the exhaust groove; and / or, the flow channel plate has a cooling groove formed on the side facing the heat spreader, and the heat spreader and the flow channel plate define the cooling channel at the cooling groove.

[0008] According to some embodiments of the present invention, the venting groove and the cooling groove are integrally stamped onto the flow channel plate.

[0009] According to some embodiments of the present invention, the battery guard plate includes a cooling groove comprising a plurality of sub-groove segments, the plurality of sub-groove segments being arranged side by side and connected in series, and the exhaust groove being located between two adjacent sub-groove segments.

[0010] According to some embodiments of the present invention, the flow channel plate is provided with an exhaust hole communicating with the exhaust groove.

[0011] According to some embodiments of the battery guard plate of the present invention, the vent hole is located at one end of the vent groove.

[0012] According to some embodiments of the present invention, the heat spreader has multiple battery support areas, which are adapted to support multiple sets of battery cells in a one-to-one correspondence; wherein, each battery support area is provided with a cooling channel and an exhaust channel.

[0013] According to some embodiments of the present invention, the exhaust channels corresponding to two adjacent battery support areas are spaced apart; and / or, the cooling channels corresponding to two adjacent battery support areas are connected.

[0014] According to some embodiments of the present invention, a separation gap is formed between two adjacent battery support regions, and the two adjacent battery support regions are connected at the ends of the separation gap.

[0015] The present invention also proposes a battery pack.

[0016] According to an embodiment of the present invention, a battery pack includes a battery cell and a battery guard plate of any of the above embodiments, wherein the battery guard plate is provided on the top and / or bottom of the battery cell, and the battery cell is provided with an explosion-proof valve facing the vent.

[0017] According to some embodiments of the present invention, the cooling channels and the exhaust channels are spaced apart in a first direction; wherein, the first direction is the length direction of the battery cell.

[0018] According to some embodiments of the present invention, the length of the battery cell in the first direction is L, and the distance between the cooling channels on both sides of the exhaust channel along the first direction is b, and satisfies: b≤L / x, where x is determined according to the specifications of the battery cell.

[0019] According to some embodiments of the present invention, the battery pack has a width of d in the first direction, a distance of c between the exhaust channel and the cooling channel, and n explosion-proof valves in the first direction, with a distance of e between two adjacent explosion-proof valves. The distances between the two outermost explosion-proof valves and the two side edges of the exhaust channel are f1 and f2, respectively, and the width of the explosion-proof valve is a. Wherein, b = d + c * 2, d = na + ne - e + f1 + f2, b = na + ne - e + f1 + f2 + 2c, satisfying: c ≥ 5mm, f1 + f2 ≥ 0.1a, e ≥ 15mm.

[0020] According to some embodiments of the present invention, the battery pack has the exhaust channel extending along a second direction; there are multiple battery cells arranged sequentially along the second direction; the explosion-proof valves of the multiple battery cells are all directly opposite one of the exhaust ports; and the second direction is perpendicular to the first direction.

[0021] According to some embodiments of the battery pack of the present invention, the second direction is the thickness direction of the battery cell.

[0022] The present invention also proposes a vehicle.

[0023] The vehicle according to embodiments of the present invention includes the battery pack described in any of the above embodiments.

[0024] The battery pack, the vehicle, and the aforementioned battery guard plate all have the same advantages over the prior art, and will not be repeated here.

[0025] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0027] Figure 1 This is a schematic diagram of the structure of the battery cell and explosion-proof valve according to an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the battery guard plate according to an embodiment of the present invention. Figure 1 ;

[0029] Figure 3 This is a schematic diagram of the structure of the battery guard plate according to an embodiment of the present invention. Figure 2 ;

[0030] Figure 4 This is a schematic diagram of the structure of the battery guard plate according to an embodiment of the present invention. Figure 3 ;

[0031] Figure 5 This is a schematic diagram of the structure of the battery guard plate according to an embodiment of the present invention. Figure 4 .

[0032] Figure label:

[0033] Battery protection plate 100,

[0034] Heat spreader 1, exhaust port 11, battery support area 12, partition gap 13

[0035] Flow channel plate 2, exhaust groove 21, cooling groove 22, sub-slot section 221, exhaust hole 23.

[0036] Cooling channel 31, exhaust channel 32, explosion-proof valve 4, battery cell 5. Detailed Implementation

[0037] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0038] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] The following is for reference. Figures 1-5 The battery protection plate 100 according to an embodiment of the present invention can smoothly discharge the gas ejected after the explosion-proof valve 4 is opened, and can also cool the ejected high-temperature gas, thereby improving the thermal safety of the battery pack and ensuring the safe and efficient operation of the battery pack.

[0041] like Figures 1-5 According to one embodiment of the present invention, a battery guard plate 100 includes: a heat spreader 1 and a flow channel plate 2.

[0042] The heat spreader 1 and the flow channel plate 2 can together form a cooler to cool the battery. The heat spreader 1 is mainly used to balance the internal temperature of the battery, so that the battery is within the optimal operating temperature range, preventing the battery from overheating or underheating, thereby extending the battery life. The heat spreader 1 can be set at the bottom, top or side of the battery cell 5, in close contact with the battery cell 5. In other words, the battery guard plate 100 can be set at the top, bottom or side of the battery cell 5. This invention is described with the battery guard plate 100 set at the bottom of the battery cell 5 as an example.

[0043] like Figure 4 As shown, the heat spreader 1 is provided with an exhaust port 11 to avoid the explosion-proof valve 4. The exhaust port 11 is used to discharge the gas inside the battery. The shape and size of the exhaust port 11 should match the shape and size of the explosion-proof valve 4 so that the explosion-proof valve 4 can pass through the exhaust port 11 to avoid the explosion-proof valve 4 on the battery cell 5, so that the explosion-proof valve 4 can work normally to open and discharge gas. This allows the airflow at the explosion-proof valve 4 to enter the exhaust channel 32 through the exhaust port 11, so as to smoothly discharge the gas inside the battery. Figure 4 The explosion-proof valve 4 shown is located at the bottom of the battery cell 5. The explosion-proof valve 4 is an important component for the safe operation of the battery. By setting the vent 11, the explosion-proof valve 4 is protected and vented. In this way, when the internal pressure of the battery is too high, the explosion-proof valve 4 will automatically open to release the pressure, prevent the battery from exploding, and improve the safety of the battery.

[0044] Furthermore, the flow channel plate 2 is connected to the heat exchange plate 1 and together defines a spaced-apart cooling flow channel 31 and an exhaust channel 32, with the exhaust channel 32 connected to the exhaust port 11.

[0045] Specifically, the flow channel plate 2 is tightly connected to the heat spreader plate 1, as shown in the attached figure. Figure 3 and attached Figure 4As shown, the flow channel plate 2 is connected below the heat spreader plate 1, and a certain distance is separated between the two to form a spaced cooling flow channel 31 and an exhaust channel 32. That is, the cooling flow channel 31 and the exhaust channel 32 are set separately. The cooling flow channel 31 is used to circulate coolant to remove the heat generated by the battery and ensure that the battery operates within a safe temperature range. The exhaust channel 32 is used to discharge the gas inside the battery. The exhaust channel 32 is connected to the exhaust port 11, so that the gas generated after the explosion-proof valve 4 installed at the exhaust port 11 is opened and sprayed can be orderly transported and discharged in the exhaust channel 32, thereby preventing the gas from accumulating inside the battery and causing safety hazards. At the same time, when venting, the heat spreader plate 1 and the flow channel plate 2 can cool down the sprayed high-temperature gas, further improving the thermal safety of the battery without affecting the performance of the cell 5.

[0046] Therefore, by setting up an exhaust port 11 and an exhaust channel 32 connected to the exhaust port 11, interference between the explosion-proof valve 4 and the battery guard plate 100 is avoided, and the gas ejected after the explosion-proof valve 4 is opened is smoothly discharged. At the same time, a cooling channel 31 spaced apart from the exhaust channel 32 is set up, which can cool down the battery and also cool down the high-temperature gas ejected, thereby improving the thermal safety of the battery pack and ensuring the safe and efficient operation of the battery pack.

[0047] According to the battery protection plate 100 of the present invention, by providing an exhaust port 11 for avoiding the explosion-proof valve 4 and an exhaust channel 32 connected to the exhaust port 11, interference between the explosion-proof valve 4 and the battery protection plate 100 is avoided, and the gas ejected after the explosion-proof valve 4 is opened is smoothly discharged. At the same time, a cooling channel 31 spaced apart from the exhaust channel 32 is provided, which can cool the battery and cool the ejected high-temperature gas, thereby improving the thermal safety of the battery pack and ensuring the safe and efficient operation of the battery pack.

[0048] In some embodiments, such as Figure 3 and Figure 4 As shown, the flow channel plate 2 has an exhaust groove 21 formed on the side facing the heat equalization plate 1, that is, as Figure 3 As shown in the vertical direction, an exhaust groove 21 is formed on the upper side of the flow channel plate 2. The cross-section of the exhaust groove 21 can be set as rectangular, circular or irregular, etc. The heat equalization plate 1 and the flow channel plate 2 define an exhaust channel 32 at the exhaust groove 21. The gas generated after the explosion-proof valve 4 opens and sprays gas can flow in the exhaust channel 32 and then be discharged through the exhaust channel 32.

[0049] In other embodiments, such as Figure 3 and Figure 4As shown, a cooling groove 22 is formed on the side of the flow channel plate 2 facing the heat exchanger plate 1, i.e., as shown in the vertical direction in Figure 3, a cooling groove 22 is formed on the upper side of the flow channel plate 2. The cross-section of the exhaust groove 21 can be set as rectangular, circular, or irregular, etc. The heat exchanger plate 1 and the flow channel plate 2 define a cooling channel 31 at the cooling groove 22. The coolant can circulate in the cooling channel 31 to achieve cooling of the battery. Figure 4 As shown, the cooling groove 22 and the exhaust groove 21 are spaced apart and not connected to each other to prevent coolant or other fluids from entering the exhaust channel 32 and preventing the gas from being discharged smoothly. The cooling groove 22 is located on the adjacent side of the exhaust groove 21, so that the cooling channel 31 can cool the gas in the exhaust channel 32 to a certain extent.

[0050] It should be noted that the depths of the cooling groove 22 and the exhaust groove 21 can be set to be the same or different, and can be flexibly set according to actual conditions and needs. For example, the depth of the exhaust groove 21 can be set to be greater than the depth of the cooling groove 22, so that more gas can flow in the exhaust channel 32, which facilitates the exhaust of gas and improves exhaust efficiency. Alternatively, the depth of the exhaust groove 21 can be set to be less than the depth of the cooling groove 22 to enhance the cooling effect. Or, the depth of the exhaust groove 21 can be set to be the same as the depth of the cooling groove 22 to facilitate manufacturing and ensure exhaust and cooling effects.

[0051] In some embodiments, the exhaust groove 21 and the cooling groove 22 are integrally stamped onto the flow channel plate 2.

[0052] In other words, the exhaust groove 21 and the cooling groove 22 are manufactured as a single unit, which not only improves production efficiency and reduces manufacturing costs, but also ensures the overall structural strength of the flow channel plate 2, effectively protecting the battery cell 5.

[0053] In some embodiments, the cooling groove 22 includes multiple sub-groove segments, that is, the cooling groove 22 includes two, three, four or more sub-groove segments, the multiple sub-groove segments are arranged side by side and connected in series, that is, the multiple sub-groove segments are connected to form a continuous cooling channel 31, which allows the coolant to flow from one sub-groove segment to the next sub-groove segment, thereby flowing along the entire cooling channel 31 to achieve effective heat exchange.

[0054] The addition of multiple sub-slots increases the flow path of the coolant and enhances the turbulence effect on the coolant, thereby improving heat exchange efficiency and enabling uniform and effective cooling of the battery.

[0055] Furthermore, the exhaust groove 21 is located between two adjacent sub-grooves, thus ensuring the existence of the exhaust channel 32 without affecting the flow of coolant, enabling the smooth discharge of gas ejected from the explosion-proof valve 4 and effective cooling of the battery.

[0056] Specifically, such as Figure 3 and Figure 4 As shown, the cooling groove 22 includes multiple sub-groove segments, and the multiple sub-groove segments are along... Figure 4 The grooves are arranged side by side in the left and right directions and connected in series. The exhaust groove 21 is located between two adjacent sub-groove segments.

[0057] In some embodiments, such as Figure 3 As shown, the flow channel plate 2 is provided with an exhaust hole 23 that communicates with the exhaust groove 21. The exhaust hole 23 can be located at the end of the exhaust groove 21, or in the middle of the exhaust groove 21 or at other locations. Thus, when the explosion-proof valve 4 at the bottom of the battery cell 5 is opened, the generated gas can be orderly transported along the exhaust groove 21 to the exhaust hole 23 and discharged from the exhaust hole 23, realizing the smooth discharge of gas to the outside. Moreover, the exhaust from the bottom of the battery cell 5 can prevent high-temperature gas from being sprayed onto the end cover plates of other adjacent battery cells 5, thereby reducing the safety risk.

[0058] In actual design, the exhaust port 23 can be connected to other air passages in the tray, or directly connected to the exhaust valve of the entire battery pack, so that the high-temperature gas generated by the opening of the explosion-proof valve 4 can be discharged to other air passages or directly discharged to the outside through the exhaust valve of the battery pack.

[0059] In some embodiments, the vent 23 is located at one end of the vent groove 21.

[0060] Specifically, such as Figure 3 As shown, the exhaust groove 21 is set along the length of the battery cell 5. The length of the exhaust groove 21 can be set as large as possible so that the length of the exhaust channel 32 is longer. This allows more gas to flow in the exhaust channel 32, which can buffer the gas generated quickly when the explosion-proof valve 4 is opened. Then the gas can flow smoothly along the exhaust groove 21 until it reaches the exhaust hole 23 at the end, and finally be discharged from the exhaust hole 23.

[0061] Therefore, by setting the exhaust port 23 at one end of the exhaust groove 21, it is beneficial to buffer the gas generated quickly when the explosion-proof valve 4 is opened, and prevent the gas from accumulating and failing to be discharged in time, thus preventing safety problems.

[0062] In actual design, the number of exhaust holes 23 can be set to one, two or more. Exhaust holes 23 can be set at both ends of the exhaust groove 21 along its length, or in the middle of the exhaust groove 21. Alternatively, exhaust holes 23 can be set at both the middle and both ends of the exhaust groove 21 to increase exhaust efficiency. The design can be flexibly set according to the actual situation and is not limited to the description in this embodiment.

[0063] In some embodiments, the heat spreader 1 has multiple battery support areas 12, which are adapted to support multiple sets of battery cells 5 in a one-to-one correspondence. That is, the battery support areas 12 are mainly used to support the battery cells 5, and multiple battery support areas 12 are provided to support multiple sets of battery cells 5, so as to ensure the stability and accuracy of multiple sets of battery cells 5 in the module.

[0064] Specifically, such as Figure 3 As shown, Figure 3 Taking the dual-module battery as an example, the heat spreader 1 has two battery support areas 12, which can support the bottom of the two sets of cells 5 one by one to ensure that the two sets of cells 5 can be stably supported.

[0065] Furthermore, each battery support area 12 is provided with a cooling channel 31 and an exhaust channel 32.

[0066] In other words, the cooling channel 31 of each battery support area 12 can circulate coolant to cool the battery cell 5 of the battery support area 12, remove the heat generated by the battery cell 5, thereby reducing the temperature of the battery cell 5, and the exhaust channel 32 of each battery support area 12 can circulate and exhaust the gas ejected from the explosion-proof valve 4.

[0067] Therefore, by setting corresponding cooling channels 31 and exhaust channels 32 in each battery support area 12 to cool down each cell 5 and exhaust gas, uniform cooling and exhaust of the battery module are achieved, preventing gas from accumulating in the cell 5 and affecting the normal operation of the battery module, thereby effectively extending the service life of the battery module.

[0068] Specifically, such as Figure 3 and Figure 4 As shown, both battery support areas 12 have corresponding cooling channels 31 and exhaust channels 32. The exhaust channel 32 is located in the middle of the battery support area 12 to facilitate connection to the explosion-proof valve 4 located at the middle position of the bottom of the battery cell 5. Figure 4 As shown, the bottom of the battery cell 5 is attached to the upper surface of the heat spreader 1, and the explosion-proof valve 4 is separated from the inner bottom wall of the exhaust channel 32 by a certain distance. In this way, the gas discharged by the explosion-proof valve 4 can be buffered.

[0069] In practical design, flame-retardant or heat-absorbing materials can also be set in the exhaust channel 32 to reduce the gas temperature and prevent combustion caused by excessively high gas temperature. For example, since the gas production volume and pressure of LFP runaway are not large and there is no large high-temperature airflow impact, there is no need to consider the airflow impact design. NCM gas production reaction is violent and the gas temperature is higher, so heat-absorbing materials can be set in the exhaust groove 21. Materials such as hydrogel can be selected to resist gas impact and cool the gas at the same time.

[0070] In some embodiments, the exhaust channels 32 corresponding to two adjacent battery support regions 12 are spaced apart.

[0071] Specifically, since the gas temperature generated after the explosion-proof valve 4 is opened is high, in order to prevent local overheating and improve heat dissipation efficiency, the exhaust channels 32 corresponding to the two adjacent battery support areas 12 are distributed at intervals so that the exhaust channels 32 corresponding to each battery support area 12 can exhaust and dissipate heat without affecting each other, avoiding the accumulation of heat that cannot be discharged in time, which would cause the battery temperature to rise continuously and cause safety hazards.

[0072] Therefore, by distributing the exhaust channels 32 corresponding to two adjacent battery support areas 12 at intervals, the heat dissipation efficiency can be improved, the operating temperature of the battery module can be effectively reduced, and the service life of the battery module can be extended.

[0073] In other embodiments, such as Figure 3 As shown, the cooling channels 31 corresponding to two adjacent battery support regions 12 are connected.

[0074] In other words, the cooling channels 31 corresponding to each battery support area 12 are connected to form an integral cooling channel 31, so that the cooling liquid can flow evenly through each part of the battery module, thereby improving heat dissipation efficiency, reducing the temperature difference inside the battery module, and thus improving the overall performance and safety of the battery module.

[0075] In some embodiments, a separation gap 13 is formed between two adjacent battery support regions 12, and the two adjacent battery support regions 12 are connected at the ends of the separation gap 13.

[0076] Specifically, such as Figure 3 As shown, the heat spreader 1 has two battery support areas 12, with a separation gap 13 between them. The flow channel plate 2 also has a corresponding gap matching the separation gap 13. The separation gap 13 is used to avoid interference between the battery guard plate 100 and the tray structure. Adjacent battery support areas 12 are connected at the ends of the separation gap 13 to ensure the overall structural stability and integrity of the heat spreader 1, enhancing the overall stability and impact resistance of the battery module.

[0077] The present invention also proposes a battery pack.

[0078] According to the battery pack of the present invention, the battery pack includes a battery cell 5 and a battery guard plate 100 of any of the above embodiments. The battery guard plate 100 is provided on the top and / or bottom of the battery cell 5. The battery guard plate 100 can be provided separately on the top or bottom of the battery cell 5, i.e., a single-layer battery guard plate 100, or the battery guard plate 100 can be provided on both the top and bottom of the battery cell 5, i.e., a double-layer battery guard plate 100. The battery cell 5 is provided with an explosion-proof valve 4 facing the exhaust port 11.

[0079] Specifically, such as Figure 4 As shown, the battery cell 5 is installed above the heat spreader plate 1, that is, the bottom of the battery cell 5 is provided with a battery guard plate 100. The bottom of the battery cell 5 is attached to the upper surface of the heat spreader plate 1. It can be connected by welding to ensure that the connection between the battery cell 5 and the heat spreader plate 1 is reliable and to prevent the heat spreader plate 1 from detaching from the bottom of the battery cell 5. The bottom of the battery cell 5 is provided with an explosion-proof valve 4 that is directly opposite the exhaust port 11. The explosion-proof valve 4 is located in the middle of the bottom of the battery cell 5 so that after the explosion-proof valve 4 is opened, the gas inside the battery cell 5 can be discharged in time through the explosion-proof valve 4 to the exhaust channel 32, and then discharged to the outside through the exhaust hole 23.

[0080] Venting gas at the bottom of cell 5 can also prevent the high-temperature gas from being sprayed onto the end covers of other adjacent cells 5, thereby reducing safety risks and improving the overall safety of the battery pack.

[0081] It should be noted that the number of explosion-proof valves 4 can be flexibly set according to actual needs. For example, there can be one, two, three or more explosion-proof valves 4. Setting multiple explosion-proof valves 4 can allow more gas to be discharged from the inside of the battery cell 5 quickly, thereby improving the exhaust efficiency.

[0082] In some embodiments, the cooling channel 31 and the exhaust channel 32 are spaced apart in a first direction, wherein the first direction is the length direction of the cell 5.

[0083] Specifically, such as Figure 3 As shown, Figure 3 The first direction shown is the length direction of the cell 5. The cooling channel 31 and the exhaust channel 32 are spaced apart in the length direction of the cell 5. This can effectively increase the length of the cooling channel 31 and the exhaust channel 32, thereby effectively improving the cooling efficiency and exhaust effect, improving the heat dissipation uniformity of the battery pack, and avoiding interference between the exhaust channel 32 and the cooling channel 31.

[0084] In actual design, the length of the battery cell can be 400mm, 500mm, 600mm, 700mm, 800mm, 900mm, 1000mm, etc., which can be selected according to actual needs.

[0085] In some embodiments, the length of the cell 5 in the first direction is L, and the distance between the cooling channels 31 located on both sides of the exhaust channel 32 along the first direction is b, and satisfies: b≤L / x, where x is determined according to the specifications of the cell 5 and is affected by the cell 5 model, heat generation power, and charging rate. For example, when the battery guard plate 100 in the battery pack is set on the top or bottom of the cell 5, that is, when only one battery guard plate 100 is set, the ratio of b to L is x1. When the battery guard plate 100 is set on the top or bottom of the cell 5 at the same time, that is, when two battery guard plates 100 are set, the ratio of b to L is x2.

[0086] Specifically, since the heat generation in the middle of the cell 5 is low during daily use, that is, less heat is generated and the temperature is low in the middle of the cell 5, and two battery guard plates 100 are also provided in the battery pack with high requirements for cooling performance, that is, battery guard plates 100 are provided at the top or bottom of the cell 5 at the same time, the exhaust channel provided in this invention will not affect the performance of the cell 5.

[0087] Furthermore, by setting the above parameters, it can be further ensured that the setting of the exhaust channel 32 will not affect the performance of the battery cell 5, thereby ensuring the normal operation of the battery pack.

[0088] In some embodiments, such as Figure 5 As shown, the width of the exhaust channel 32 in the first direction is d, and the distance between the exhaust channel 32 and the cooling channel 31 is c. This distance c can effectively ensure the reliable connection between the heat spreader 1 and the channel plate 2. The battery cell 5 is provided with n explosion-proof valves 4 in the first direction, that is, n can be 1, 2, 3, etc., so that the explosion-proof valves 4 can be set to one, two, three, etc. The distance between two adjacent explosion-proof valves 4 is e, that is, the explosion-proof valves 4 are evenly spaced apart. The distances between the two outermost explosion-proof valves 4 and the two sides of the exhaust channel 32 are f1 and f2, respectively. The setting of f1 and f2 effectively ensures the normal operation of the explosion-proof valves 4 and prevents interference between the explosion-proof valves 4 and the two sides of the exhaust channel 32, which would cause wear to the explosion-proof valves 4.

[0089] Where b = d + c * 2, d = na + ne - e + f1 + f2, b = na + ne - e + f1 + f2 + 2c, satisfying: c ≥ 5 mm, f1 + f2 ≥ 0.1a, e ≥ 15 mm, 19.5 mm ≤ a ≤ 20.5 mm.

[0090] Specifically, the distance c between the exhaust channel 32 and the cooling channel 31 can be set to 5mm, 5.5mm, 6mm, 6.5mm, 7mm or other values. By setting c to be greater than or equal to 5mm, the welding strength between the heat spreader 1 and the channel plate 2 can be effectively guaranteed, the connection reliability and stability between the heat spreader 1 and the channel plate 2 can be improved, and the structural strength of the battery guard plate 100 can be effectively improved.

[0091] The distance e between two adjacent explosion-proof valves 4 can be set to 15mm, 15.5mm, 16mm, 16.5mm, 17mm or other values. By setting e to greater than or equal to 15mm, it can be effectively ensured that each explosion-proof valve 4 works without affecting the others.

[0092] By setting f1+f2 to be greater than or equal to 0.1a as the assembly gap, it is effectively ensured that the explosion-proof valve 4 and the exhaust channel 32 do not interfere with each other, and that the gas ejected from the explosion-proof valve 4 can smoothly enter the exhaust channel 32 to achieve smooth exhaust.

[0093] The width 'a' of the explosion-proof valve 4 can be set to 19.5mm, 20mm, 20.5mm or other values, and can be flexibly set according to the actual situation.

[0094] like Figure 5 As shown, b = d + c * 2, d = na + ne - e + f1 + f2, b = na + ne - e + f1 + f2 + 2c. When an explosion-proof valve 4 is installed, i.e., n is 1, b and d take the minimum values.

[0095] Therefore, by setting the above parameters, the exhaust channel 32 can be set up to ensure the overall cooling effect of the battery protection plate 100, thereby simultaneously achieving smooth exhaust and effective cooling of the inside of the battery cell 5 and ensuring the overall safety of the battery pack.

[0096] In some embodiments, the exhaust channel 32 extends along the second direction, and there are multiple battery cells 5, that is, two, three or more battery cells 5 can be provided. The multiple battery cells 5 are arranged sequentially along the second direction, and the explosion-proof valves 4 of the multiple battery cells 5 are all directly opposite an exhaust port 11. The second direction is perpendicular to the first direction.

[0097] Specifically, such as Figure 4 As shown, the second direction is Figure 4 In the vertical direction, the exhaust channel 32 extends in the vertical direction, so that the gas can be smoothly discharged through the exhaust channel 32. When multiple cells 5 are configured, the multiple cells 5 are arranged in sequence in the vertical direction. In this way, the space of the battery module can be fully utilized and the energy density of the battery can be improved. The explosion-proof valves 4 of multiple cells 5 are all directly opposite an exhaust port 11, so that the gas inside each cell 5 can be discharged into the exhaust channel 32 through the corresponding explosion-proof valve 4, and then discharged to the outside through the exhaust channel 32.

[0098] In some embodiments, such as Figure 5 As shown, the second direction is the thickness direction of the cell 5, that is, multiple cells 5 are arranged sequentially along the thickness direction of the cell 5 in order to make full use of the space of the battery module and improve the energy density of the battery.

[0099] The present invention also proposes a vehicle comprising the battery pack of any of the above embodiments.

[0100] By setting up an exhaust port 11 to avoid interference between the explosion-proof valve 4 and the battery guard plate 100, the gas ejected after the explosion-proof valve 4 is opened can be smoothly discharged. At the same time, a cooling channel 31 spaced apart from the exhaust channel 32 can cool the battery and the ejected high-temperature gas, thereby improving the thermal safety of the battery pack and ensuring the safe and efficient operation of the battery pack.

[0101] The following data shows that for a certain L=580mm cell 5, based on the heat generation data under 1.5C fast charging, x1=6 and x2=3. Therefore, the value of b can be determined as follows: (when c=5, n=1) 1.1a+10≤b≤L / 6 (single-layer battery protection plate 100) or (when c=5, n=1) 1.1a+10≤b≤L / 3 (double-layer battery protection plate 100). The simulation results are shown in Tables 1 and 2 below.

[0102] "Without affecting performance" means that, compared with the fully cooled operating condition (i.e., b = 0), b takes values ​​within this range, the temperature difference △T of cell 5 and the temperature difference △T_0 when b = 0 are △T1 = (△T - △T_0) ≤ 1℃, and the temperature difference △T2 of the highest temperature TMAX of cell 5 and the highest temperature TMAX_0 when b = 0 are △T2 = (TMAX - TMAX_0) ≤ 2℃.

[0103]

[0104]

[0105] Table 1

[0106]

[0107]

[0108] Table 2

[0109] The table above shows that, compared to the fully cooled condition (i.e., b = 0), when b is set within the range of b ≤ L / x, the temperature difference between the cells 5 of the single-layer battery protection plate 100 and the double-layer battery protection plate 100 is less than or equal to 1℃, and the maximum temperature difference between the cells 5 of the single-layer battery protection plate 100 and the double-layer battery protection plate 100 is less than or equal to 2℃. This verifies that the setting of the exhaust channel 32 does not affect the performance of the cell 5, ensures the overall cooling effect of the battery pack, and achieves exhaust.

[0110] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0111] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that, include: The battery protection plate includes: a heat spreader plate (1) and a flow channel plate (2). The heat spreader plate (1) is provided with an exhaust port (11) for avoiding the explosion-proof valve (4). The flow channel plate (2) is connected to the heat spreader plate (1) and together defines a spaced-apart cooling flow channel (31) and an exhaust channel (32). The exhaust channel (32) is connected to the exhaust port (11). The battery cell (5) has a battery guard plate on its top and / or bottom, and the battery cell (5) has an explosion-proof valve (4) facing the exhaust port (11). The cooling channel (31) and the exhaust channel (32) are spaced apart in a first direction, which is the length direction of the battery cell (5). Wherein, along the first direction, the distance between the cooling channels (31) located on both sides of the exhaust channel (32) is b, the width of the exhaust channel (32) in the first direction is d, the distance between the exhaust channel (32) and the cooling channel (31) is c, the battery cell (5) is provided with n explosion-proof valves (4) in the first direction, the distance between two adjacent explosion-proof valves (4) is e, wherein the distances between the two outermost explosion-proof valves (4) and the two sides of the exhaust channel (32) are f1 and f2 respectively, the width of the explosion-proof valve (4) is a, b=d+c*2, d=na+ne-e+f1+f2, b=na+ne-e+f1+f2+2c, satisfying: c≥5mm, f1+f2≥0.1a, e≥15mm.

2. The battery pack according to claim 1, characterized in that, The flow channel plate (2) has an exhaust groove (21) formed on the side facing the heat equalization plate (1), and the heat equalization plate (1) and the flow channel plate (2) define the exhaust channel (32) at the exhaust groove (21); And / or, the flow channel plate (2) has a cooling groove (22) formed on the side facing the heat exchange plate (1), and the heat exchange plate (1) and the flow channel plate (2) define the cooling flow channel (31) at the cooling groove (22).

3. The battery pack according to claim 2, characterized in that, The exhaust groove (21) and the cooling groove (22) are integrally stamped onto the flow channel plate (2).

4. The battery pack according to claim 2, characterized in that, The cooling groove (22) includes multiple sub-groove segments, which are arranged side by side and connected in series. The exhaust groove (21) is located between two adjacent sub-groove segments.

5. The battery pack according to claim 2, characterized in that, The flow channel plate (2) is provided with an exhaust hole (23) that communicates with the exhaust groove (21).

6. The battery pack according to claim 5, characterized in that, The vent (23) is located at one end of the vent groove (21).

7. The battery pack according to any one of claims 1-6, characterized in that, The heat spreader (1) has multiple battery support areas (12), and the multiple battery support areas (12) are adapted to support multiple sets of battery cells (5) in a one-to-one correspondence. Each of the battery support areas (12) is provided with a cooling channel (31) and an exhaust channel (32).

8. The battery pack according to claim 7, characterized in that, The exhaust channels (32) corresponding to two adjacent battery support areas (12) are spaced apart; And / or, the cooling channels (31) corresponding to two adjacent battery support regions (12) are connected.

9. The battery pack according to claim 7, characterized in that, A separation gap (13) is formed between two adjacent battery support regions (12), and the two adjacent battery support regions are connected at the ends of the separation gap (13).

10. The battery pack according to claim 1, characterized in that, The length of the battery cell (5) in the first direction is L, and satisfies: b≤L / x, where x is determined according to the specifications of the battery cell (5).

11. The battery pack according to claim 1, characterized in that, The exhaust passage (32) extends along the second direction; There are multiple battery cells (5), and the multiple battery cells (5) are arranged sequentially along the second direction. The explosion-proof valves (4) of the multiple battery cells (5) are all directly opposite one of the exhaust ports (11). The second direction is perpendicular to the first direction.

12. The battery pack according to claim 11, characterized in that, The second direction is the thickness direction of the battery cell (5).

13. A vehicle, characterized in that, The battery pack includes any one of claims 1-12.

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