Battery cells and battery packs

Abstract

This invention relates to the field of battery technology and discloses a battery cell and a battery pack. The battery cell includes: a housing, the housing including a first stepped portion and a second stepped portion, the second stepped portion extending from one side of the first stepped portion in a first direction away from the first stepped portion; an electrode post disposed on the side of the first stepped portion away from the second stepped portion in the first direction; a first explosion-proof valve disposed on both sides of the second stepped portion in a second direction; the housing includes a first connecting surface and a second connecting surface, the first connecting surface being disposed on both sides of the first stepped portion in the second direction, and the second connecting surface being disposed on the side of the first stepped portion along the first direction adjacent to the second stepped portion, the first connecting surface and the second connecting surface being adhesive surfaces and / or heat dissipation surfaces. The battery cell and battery pack provided by this invention improve thermal management performance while achieving thermoelectric separation.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more specifically to a battery cell and a battery pack. Background Technology

[0002] With the accelerated industrialization of the power electric vehicle industry, the safety design of battery packs has become a hot research topic. However, existing battery packs cannot achieve thermoelectric separation and have low thermal management performance. Summary of the Invention

[0003] In view of this, the present invention provides a battery cell and a battery pack to solve the problem that existing battery packs cannot achieve thermoelectric separation and have low thermal management performance.

[0004] In a first aspect, the present invention provides a battery cell, comprising:

[0005] The housing includes a first stepped portion and a second stepped portion, wherein the second stepped portion extends from one side of the first stepped portion in a first direction toward a direction away from the first stepped portion;

[0006] The pole post is located on the side of the first step portion away from the second step portion along the first direction;

[0007] The first explosion-proof valve is located on both sides of the second step in the second direction.

[0008] The housing includes a first connecting surface and a second connecting surface. The first connecting surface is disposed on both sides of the first step portion in a second direction, and the second connecting surface is disposed on the side of the first step portion along the first direction adjacent to the second step portion. The first connecting surface and the second connecting surface are adhesive surfaces and / or heat dissipation surfaces.

[0009] The battery cell provided by this invention has first explosion-proof valves arranged on both sides of the second step in the second direction, thus forming a double explosion-proof valve structure. This increases the battery pressure relief speed, achieves rapid venting, and improves the safety performance of the battery pack. A terminal post is arranged on the side of the first step away from the second step in the first direction, so that the terminal post and the first explosion-proof valve are respectively located on both sides of the housing in the first direction. This avoids the impact of the first explosion-proof valve opening under thermal runaway conditions on the terminal post, thereby achieving thermoelectric separation. A first connecting surface is arranged on both sides of the first step in the second direction, and a second connecting surface is arranged at the shoulder position of the "convex" shaped battery cell structure. Both the first and second connecting surfaces can serve as bonding surfaces, heat dissipation surfaces, or both simultaneously. This facilitates the integration of the battery cell into the battery pack, ensures the mode of the battery pack, and guarantees sufficient heat dissipation area for the battery cell, improving the thermal management performance of the battery pack.

[0010] Secondly, the present invention also provides a battery pack, comprising:

[0011] The cold plate includes a first plate and a second plate. The second plate is disposed on one side of the first plate in a first direction. The second plate is formed by extending the first plate in a second direction away from the first plate. The first plate is hollow and forms a cooling channel. The second plate is hollow and forms a first exhaust channel. Several exhaust holes are opened on both sides of the second plate in a second direction. The exhaust holes are connected to the first exhaust channel.

[0012] And as described above, the battery cell is disposed between two adjacent cold plates, the second side of the first step portion is bonded to the first plate body in the second direction, and the second side of the second step portion is bonded to the second plate body in the second direction.

[0013] The first explosion-proof valve and the vent are positioned opposite each other along the second direction.

[0014] Beneficial effects: The battery pack provided by this invention has a casing bonded to the first plate via the second side of the first step portion, thereby forming a structure similar to a large module with the battery cells and the cold plate. Simultaneously, the casing is bonded to the second plate via the second side of the second step portion, further enhancing the connection strength between the battery cells and the cold plate, thus improving the modal and / or strength of the entire battery pack. This eliminates the need for traditional steel cable ties and other accessories, improving volumetric assembly efficiency and reducing costs. The first plate has cooling channels; by bonding the first step portion to the first plate, the cooling medium within the cooling channels can effectively remove heat from the battery cells during circulation, enhancing the cooling performance of the battery pack. The terminals and the first explosion-proof valve are respectively located on the first side of the casing. The second plate has vent holes and a first exhaust channel. The integration of the casing and the cold plate allows the first explosion-proof valve to be integrated with the vent holes and the first exhaust channel, thereby dissipating the gas generated by thermal runaway to the outside of the battery pack through the first exhaust channel. This improves volumetric assembly efficiency while achieving thermoelectric separation.

[0015] In one optional embodiment, the first connecting surface and the first plate are disposed opposite each other along the second direction, and the first connecting surface is adapted to be bonded and fixed to the first plate.

[0016] The second connecting surface is disposed opposite to the second plate body along the first direction, and the second connecting surface is adapted to be bonded and fixed to the second plate body.

[0017] Beneficial effects: By bonding the first connecting surface to the first plate, the cooling medium in the cooling channel cools the battery cell, enhancing the cooling performance of the battery pack. By bonding the second connecting surface to the second plate, the modal and / or strength of the entire battery pack is enhanced. Traditional steel cable ties and other accessories are eliminated, which can improve the volume assembly efficiency and reduce costs.

[0018] In one alternative embodiment, the battery cell further includes a blue film adapted to cover the housing;

[0019] The blue film has a first window and a second window; the first window is located between the first connecting surface and the first plate, and the first window is adapted to accommodate a first adhesive layer, which is adapted to bond the first connecting surface and the first plate to one side in a first direction; the second window is located between the second connecting surface and the second plate, and the second window is adapted to accommodate a second adhesive layer, which is adapted to bond the second connecting surface and the second plate to one side in a first direction toward the first step.

[0020] Beneficial effects: It can achieve direct bonding between the first connecting surface and the first plate and between the second connecting surface and the second plate, enhancing the bonding performance between the cold plate and the cell, thereby enhancing the modal and / or strength of the entire battery pack. It can also accommodate the first adhesive layer through the first window and the second adhesive layer through the second window, thereby limiting the adhesive layer and preventing the cell's cycle life from being affected by the adhesive overflowing onto the large surface of the cell.

[0021] In one alternative implementation, the first adhesive layer is made of a thermally conductive material.

[0022] Beneficial effects: It can bond the first connecting surface to the first plate through the first adhesive layer, enhance the modality and / or strength of the entire battery pack, thereby forming a structure similar to a large module with the cells and the cold plate, eliminating the need for traditional steel cable ties and other accessories, improving the volume assembly efficiency, and also enabling rapid heat conduction between the first connecting surface and the first plate, thereby enhancing the cooling performance of the battery pack.

[0023] In one alternative embodiment, the cooling channel and the first exhaust channel are disposed opposite each other along a first direction;

[0024] The second adhesive layer is made of a thermally conductive material.

[0025] Beneficial effects: It can bond the second connecting surface to the second plate through the second adhesive layer, further enhancing the modal and / or strength of the entire battery pack, and can also achieve rapid heat conduction between the second connecting surface and the second plate, thereby further enhancing the cooling performance of the battery pack.

[0026] In one optional embodiment, the blue film includes a first spiral surface and a second spiral surface, the first spiral surface being adapted to enclose and form a first window, and the second spiral surface being adapted to enclose and form a second window;

[0027] The battery pack also includes a first spiral-shaped adhesive baffle and a second spiral-shaped adhesive baffle; the first spiral-shaped adhesive baffle is bonded to a first spiral-shaped surface and is adapted to limit the first adhesive layer together with the first spiral-shaped surface; the second spiral-shaped adhesive baffle is bonded to a second spiral-shaped surface and is adapted to limit the second adhesive layer together with the second spiral-shaped surface.

[0028] Beneficial effects: It can effectively prevent glue from overflowing onto the main surface of the battery cell, thus affecting the cycle life of the battery cell, and can also ensure the bonding performance between the cold plate and the casing, thereby improving the structural strength of the battery pack.

[0029] In one optional implementation, the width of the first and second spiral surfaces is L, where L satisfies 5mm ≤ L ≤ 10mm.

[0030] Beneficial effects: It can ensure the bonding strength between the first loop-shaped adhesive baffle and the first loop-shaped surface, and between the second loop-shaped adhesive baffle and the second loop-shaped surface, and ensure the effective limiting of the first and second adhesive layers, thereby effectively avoiding the impact on the cycle life of the battery cell due to adhesive overflow onto the large surface of the battery cell. It can also ensure that the first and second adhesive layers have sufficient coverage area on the casing, thereby ensuring the bonding performance between the cold plate and the casing and the cooling performance of the cold plate on the casing, and ensuring the modal and / or strength of the battery pack.

[0031] In one alternative embodiment, the cold plate further includes a third plate body disposed on the side of the first plate body away from the second plate body along a first direction. The third plate body is formed by extending the first plate body away from the first plate body along a second direction. The third plate body is adapted to abut against the side of the first step portion away from the second step portion along the first direction.

[0032] Beneficial effects: The third plate supports the battery cell, while the first and second plates are bonded to the battery cell casing. At the same time, the third plate can share the force with the first and second plates, thereby enhancing the modal and / or strength of the entire battery pack.

[0033] In one alternative embodiment, the battery pack further includes a base plate and a side beam extending from the circumferential edge of the base plate in a first direction away from the base plate. The base plate and the side beam together enclose a receiving space suitable for accommodating a cold plate and a battery cell.

[0034] The side beam is hollow inside, forming a second exhaust channel, which is connected to the first exhaust channel.

[0035] The battery pack also includes a second explosion-proof valve, which is located on the side of the side beam away from the housing space.

[0036] Beneficial effects: When the battery cell experiences thermal runaway, the first explosion-proof valve opens, and the gas generated by the thermal runaway enters the first exhaust channel through the exhaust port for the first cooling, then enters the second exhaust channel for the second cooling, and finally the room temperature gas is discharged through the second explosion-proof valve, which improves the pressure relief speed of the battery pack and enhances the safety performance of the battery pack. Attached Figure Description

[0037] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0038] Figure 1 This is a first perspective view of a battery cell according to an embodiment of the present invention;

[0039] Figure 2 for Figure 1 The image shown is a 3D view of the battery cell behind the hidden blue film;

[0040] Figure 3 This is a second perspective view of a battery cell according to an embodiment of the present invention;

[0041] Figure 4 for Figure 3 The image shown is a 3D view of the battery cell behind the hidden blue film;

[0042] Figure 5 for Figure 3 A 3D view of the blue film on the battery cell shown.

[0043] Figure 6 for Figure 3 The exploded view shown is of the battery cell with the first adhesive layer and the first loop-shaped adhesive baffle, as well as the second adhesive layer and the second loop-shaped adhesive baffle.

[0044] Figure 7 This is a diagram showing the arrangement of battery cells in a battery pack according to an embodiment of the present invention.

[0045] Figure 8 This is a perspective view of a cold plate according to an embodiment of the present invention;

[0046] Figure 9 for Figure 8 The cross-sectional view of the cold plate along the first direction is shown;

[0047] Figure 10 This is a diagram showing the arrangement of cold plates in a battery pack according to an embodiment of the present invention.

[0048] Figure 11 This is a first perspective view of a battery pack after the cold plate and the battery cell are integrally bonded and formed according to an embodiment of the present invention;

[0049] Figure 12 This is a second perspective view of a battery pack after the cold plate and the battery cell are integrally bonded and formed according to an embodiment of the present invention;

[0050] Figure 13 This is a perspective view of a battery pack according to an embodiment of the present invention;

[0051] Figure 14 for Figure 13 The cross-sectional view of the side beam of the battery pack along the first direction is shown.

[0052] Explanation of reference numerals in the attached figures:

[0053] 10. Cold plate; 11. First plate; 111. Cooling channel; 12. Second plate; 121. First exhaust channel; 122. Exhaust hole; 13. Third plate;

[0054] 20. Battery cell; 21. Housing; 2101. First connecting surface; 2102. Second connecting surface; 211. First stepped portion; 212. Second stepped portion; 22. Terminal post; 23. First explosion-proof valve; 24. Blue membrane; 2401. First window; 2402. Second window; 241. First spiral surface; 242. Second spiral surface;

[0055] 31. First adhesive layer; 32. Second adhesive layer;

[0056] 41. First spiral-shaped sealing element; 42. Second spiral-shaped sealing element;

[0057] 51. Base plate; 52. Side beam; 521. Second exhaust channel; 53. Second explosion-proof valve. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0059] The battery packs in related technologies mostly use top or bottom venting, which cannot achieve thermal and electrical separation, and the blade cells are assembled into bundled modules, resulting in low grouping efficiency.

[0060] The following is combined with Figures 1 to 14 The following describes embodiments of the present invention.

[0061] According to an embodiment of the present invention, in one aspect, a battery cell 20 is provided, comprising:

[0062] The housing 21 includes a first stepped portion 211 and a second stepped portion 212, wherein the second stepped portion 212 extends from one side of the first stepped portion 211 in a first direction away from the first stepped portion 211.

[0063] The pole post 22 is disposed on the side of the first step portion 211 away from the second step portion 212 along the first direction;

[0064] The first explosion-proof valve 23 is disposed on both sides of the second step portion 212 in the second direction;

[0065] The housing 21 includes a first connecting surface 2101 and a second connecting surface 2102. The first connecting surface 2101 is disposed on both sides of the first step portion 211 in a second direction, and the second connecting surface 2102 is disposed on the side of the first step portion 211 along the first direction close to the second step portion 212. The first connecting surface 2101 and the second connecting surface 2102 are adhesive surfaces and / or heat dissipation surfaces.

[0066] Compared with the rectangular structure of battery cells in related technologies, the battery cell provided by the present invention adopts a "convex" shaped structure. Its shell 21 includes a first step portion 211 and a second step portion 212. The second step portion 212 extends from one side of the first step portion 211 in a first direction away from the first step portion 211, thereby forming an octagonal irregular body structure. Firstly, there are more heat dissipation surfaces, and the total heat dissipation area formed by integrating it into the battery pack is larger, which is beneficial to improving the thermal management performance of the battery pack. Secondly, there are more selectable bonding surfaces, and the bonding area is larger when integrated into the battery pack, which is beneficial to improving the bonding strength and enhancing the mode of the battery pack. Thirdly, due to the greater selection of heat dissipation surfaces and / or bonding surfaces, the adaptability of the battery cell and the battery pack integrated with the battery cell is stronger. Fourthly, the terminal post 22 and the first explosion-proof valve 23 can be set on different surfaces, which not only realizes thermal and electrical separation, but also provides more selection of thermal and electrical separation space.

[0067] Please see Figure 2 As shown, first explosion-proof valves 23 are provided on both sides of the second step portion 212 in the second direction, thus forming a double explosion-proof valve structure, which increases the battery pressure relief speed, realizes the function of rapid venting, and improves the safety performance of the battery pack. A terminal post 22 is provided on the side of the first step portion 211 away from the second step portion 212 along the first direction, so that the terminal post 22 and the first explosion-proof valve 23 are respectively located on both sides of the housing 21 in the first direction, avoiding the influence of the first explosion-proof valve 23 on the terminal post 22 when it opens under thermal runaway conditions, thereby achieving thermoelectric separation. A first connecting surface 2101 is provided on both sides of the first step portion 211 in the second direction, and a second connecting surface 2102 is provided at the shoulder position of the "convex" shaped cell structure. Both the first connecting surface 2101 and the second connecting surface 2102 can serve as both bonding surfaces and heat dissipation surfaces, or simultaneously as both. This facilitates cell integration into the battery pack, ensures the mode of the battery pack, and guarantees sufficient heat dissipation area for the cells, improving the thermal management performance of the battery pack.

[0068] According to an embodiment of the present invention, in another aspect, a battery pack is also provided, comprising:

[0069] Cold plate 10, made of metal, please refer to Figure 8 As shown, the cold plate 10 includes a first plate body 11 and a second plate body 12. The second plate body 12 is disposed on one side of the first plate body 11 in a first direction, and the second plate body 12 extends from the first plate body 11 in a second direction away from the first plate body 11. Please refer to [link to previous text]. Figure 9 As shown, the first plate 11 is hollow inside and forms a cooling channel 111, which is suitable for the flow of cooling medium; the second plate 12 is hollow inside and forms a first exhaust channel 121, which is independently arranged from the cooling channel 111; a plurality of exhaust holes 122 are opened on both sides of the second direction of the second plate 12, and the exhaust holes 122 are connected to the first exhaust channel 121.

[0070] And as for the aforementioned cell 20, please refer to... Figure 11 As shown, the battery cell 20 is disposed between two adjacent cold plates 10, the first step portion 211 is bonded to the first plate 11 on both sides in the second direction, and the second step portion 212 is bonded to the second plate 12 on both sides in the second direction.

[0071] The first explosion-proof valve 23 and the vent 122 are arranged opposite each other along the second direction.

[0072] It should be noted that, please refer to Figure 7 As shown, several battery cells 20 are arranged in a single row along a third direction, with the large sides of two adjacent battery cells 20 abutting against each other; please combine this with... Figure 11 and Figure 12 As shown, several rows of battery cells 20 are spaced apart along a second direction, and a cold plate 10 is disposed between two adjacent rows of battery cells 20 and / or located on the outside of a single row of battery cells 20. The battery cells 20 can adopt a short-blade battery cell structure, and the length of the battery cell 20 along the second direction can be 200mm to 600mm.

[0073] The first explosion-proof valve 23 of each cell 20 and the exhaust port 122 on the second plate 12 are arranged opposite each other in the second direction. After the first explosion-proof valve 23 is opened under thermal runaway conditions, it is connected to the first exhaust channel 121 through the exhaust port 122, and can discharge the thermal runaway gas into the first exhaust channel 121 through the exhaust port 122, thereby realizing thermoelectric separation.

[0074] The battery pack provided by this invention has a housing 21 bonded to a first plate 11 via two sides of a first stepped portion 211 in a second direction, thereby forming a structure similar to a large module with the battery cell 20 and the cold plate 10. Simultaneously, the housing 21 is bonded to a second plate 12 via two sides of a second stepped portion 212 in a second direction, further enhancing the connection strength between the battery cell 20 and the cold plate 10, thus improving the modal and / or strength of the entire battery pack. This eliminates the need for traditional steel cable ties and other accessories, improving volumetric assembly efficiency and reducing costs. The first plate 11 is provided with cooling channels 111, which are connected to the first plate 11 via the first stepped portion 211. 1. The cooling medium in the cooling channel 111 can carry away the heat of the cell 20 in time during the circulation process, which enhances the cooling performance of the battery pack. The terminal post 22 and the first explosion-proof valve 23 are respectively set on the first side of the housing 21. The second plate 12 is provided with an exhaust hole 122 and a first exhaust channel 121. While the housing 21 is bonded and integrated with the cold plate 10, the first explosion-proof valve 23 can be integrated with the first exhaust channel 121 through the exhaust hole 122, thereby dissipating the gas generated by thermal runaway to the outside of the battery pack through the first exhaust channel 121. This improves the volume assembly efficiency and achieves thermal-electric separation.

[0075] It should be noted that the air in the first exhaust channel 121 can also be used as a cooling medium. The housing 21 is bonded to the second plate 12 on both sides of the second step portion 212 in the second direction. While enhancing the modal and / or strength of the entire battery pack, under normal operating conditions, the air in the first exhaust channel 121 can also remove at least part of the heat from the cell 20, which is beneficial to enhancing the cooling performance of the battery pack.

[0076] Furthermore, the first plate 11 and the second plate 12 can be integrally formed, which is beneficial to enhance the overall stress performance of the cold plate 10 and at the same time ensure the sealing performance of the cold plate 10.

[0077] In some embodiments, please combine Figure 7 and Figure 11 As shown, the first connecting surface 2101 and the first plate 11 are arranged opposite to each other along the second direction. The first connecting surface 2101 is suitable for bonding and fixing with the first plate 11, thereby forming a structure similar to a large module with the battery cell 20 and the cold plate 10.

[0078] The second connecting surface 2102 is disposed opposite to the second plate 12 along the first direction. The second connecting surface 2102 is adapted to be bonded and fixed to the second plate 12, which further enhances the modality and / or strength of the entire battery pack.

[0079] Both the cold plate 10 and the casing 21 are made of metal. By bonding the first connecting surface 2101 to the first plate 11, the cooling medium in the cooling channel 111 cools the cell 20, thereby enhancing the cooling performance of the battery pack. The second connecting surface 2102 is bonded to the second plate 12, thereby enhancing the modal and / or strength of the entire battery pack. Traditional steel cable ties and other accessories are eliminated, which can improve the volume assembly efficiency and reduce the cost.

[0080] In some embodiments, see Figure 1 As shown, the battery cell 20 also includes a blue film 24, which is adapted to cover the housing 21;

[0081] Please combine them together Figure 5 and Figure 6 As shown, the blue film 24 has a first window 2401 and a second window 2402; the first window 2401 is disposed between the first connecting surface 2101 and the first plate 11, and the first window 2401 is adapted to accommodate the first adhesive layer 31, which is adapted to bond the first connecting surface 2101 to the first plate 11 on one side in the first direction; the second window 2402 is disposed between the second connecting surface 2102 and the second plate 12, and the second window 2402 is adapted to accommodate the second adhesive layer 32, which is adapted to bond the second connecting surface 2102 to the second plate 12 on the side facing the first step portion 211 in the first direction.

[0082] Since the cold plate 10 and the casing 21 are both made of metal, while the blue film 24 is made of plastic, by opening the first window 2401 and the second window 2402 on the blue film 24, it is possible to achieve direct bonding between the first connecting surface 2101 and the first plate 11 and between the second connecting surface 2102 and the second plate 12, thereby enhancing the bonding performance between the cold plate 10 and the battery cell 20 and thus enhancing the modal and / or strength of the entire battery pack. At the same time, the first adhesive layer 31 can be accommodated through the first window 2401 and the second adhesive layer 32 can be accommodated through the second window 2402, thereby limiting the adhesive layer and preventing the battery cell's cycle life from being affected by the glue overflowing onto the large surface of the battery cell.

[0083] In some embodiments, the first adhesive layer 31 is made of a thermally conductive material, which can both bond the first connecting surface 2101 to the first plate 11 through the first adhesive layer 31, enhance the modal and / or strength of the entire battery pack, thereby forming the cell 20 and the cold plate 10 into a structure similar to a large module, eliminating the need for traditional steel cable ties and other accessories, improving the volume assembly efficiency, and enable rapid heat conduction between the first connecting surface 2101 and the first plate 11, thereby enhancing the cooling performance of the battery pack.

[0084] Furthermore, the first adhesive layer 31 can be made of thermally conductive structural adhesive.

[0085] Furthermore, the second adhesive layer 32 can be made of general structural adhesive, which can both enhance the bonding strength between the second bonding surface 2102 and the second plate 12 and reduce costs.

[0086] In some embodiments, see Figure 9 As shown, the cooling channel 111 is arranged adjacent to the first exhaust channel 121; the cooling channel 111 and the first exhaust channel 121 are arranged opposite to each other in the first direction, and the cooling medium in the cooling channel 111 conducts heat with the first plate 11, thereby cooling the gas in the first exhaust channel 121 and improving the safety performance of the battery pack.

[0087] The second adhesive layer 32 is made of a thermally conductive material, which can both bond the second connecting surface 2102 to the second plate 12 through the second adhesive layer 32, further enhancing the modality and / or strength of the entire battery pack, and also enable rapid heat conduction between the second connecting surface 2102 and the second plate 12, thereby further enhancing the cooling performance of the battery pack.

[0088] In some embodiments, see Figure 5 As shown, the blue film 24 includes a first spiral surface 241 and a second spiral surface 242. The first spiral surface 241 is adapted to enclose and form a first window 2401, and the second spiral surface 242 is adapted to enclose and form a second window 2402.

[0089] Please combine them together Figure 6 As shown, the battery pack also includes a first loop-shaped adhesive baffle 41 and a second loop-shaped adhesive baffle 42; the first loop-shaped adhesive baffle 41 is bonded to the first loop-shaped surface 241, and the first loop-shaped adhesive baffle 41 is adapted to work with the first loop-shaped surface 241 to limit the first adhesive layer 31; the second loop-shaped adhesive baffle 42 is bonded to the second loop-shaped surface 242, and the second loop-shaped adhesive baffle 42 is adapted to work with the second loop-shaped surface 242 to limit the second adhesive layer 32. This can effectively prevent the battery cell's cycle life from being affected by glue overflowing onto the large surface of the battery cell, and can also ensure the bonding performance between the cold plate 10 and the casing 21, thereby improving the structural strength of the battery pack.

[0090] Furthermore, the first loop-shaped sealing element 41 and the second loop-shaped sealing element 42 are made of foam material.

[0091] In some embodiments, please combine Figure 5 As shown, the width of the first spiral surface 241 and the second spiral surface 242 is L, and L satisfies 5mm≤L≤10mm.

[0092] It should be noted that if the width of the first loop-shaped surface 241 and the second loop-shaped surface 242 is too narrow, it will easily reduce the bonding strength between the first loop-shaped adhesive baffle 41 and the first loop-shaped surface 241, and between the second loop-shaped adhesive baffle 42 and the second loop-shaped surface 242, making it impossible to effectively limit the adhesive layer. Therefore, L must satisfy L≥5mm. If the width of the first loop-shaped surface 241 and the second loop-shaped surface 242 is too wide, it will easily reduce the application area of ​​the first adhesive layer 31 and the second adhesive layer 32 on the housing 21, resulting in a reduction in the bonding performance between the cold plate 10 and the housing 21, affecting the mode and / or strength of the entire battery pack. Therefore, L must also satisfy L≤10mm.

[0093] The width L of the first loop-shaped surface 241 and the second loop-shaped surface 242 satisfies 5mm≤L≤10mm. This ensures the bonding strength between the first loop-shaped adhesive baffle 41 and the first loop-shaped surface 241, and between the second loop-shaped adhesive baffle 42 and the second loop-shaped surface 242, effectively limiting the first adhesive layer 31 and the second adhesive layer 32. This effectively prevents the battery cell's cycle life from being affected by adhesive overflowing onto the large surface of the battery cell. At the same time, it ensures that the first adhesive layer 31 and the second adhesive layer 32 have sufficient coverage area on the housing 21, thereby ensuring the bonding performance between the cold plate 10 and the housing 21, as well as the cooling performance of the cold plate 10 on the housing 21, and ensuring the modal and / or strength of the battery pack.

[0094] In some embodiments, see Figure 9 As shown, the cold plate 10 also includes a third plate 13, which is disposed on the side of the first plate 11 away from the second plate 12 along the first direction. The third plate 13 is formed by extending the first plate 11 away from the first plate 11 along the second direction. The third plate 13 is adapted to abut against the side of the first step portion 211 away from the second step portion 212 along the first direction.

[0095] By providing a third plate 13 on the side of the first plate 11 away from the second plate 12 along the first direction, the battery cell 20 is supported by the third plate 13. Both the first plate 11 and the second plate 12 are bonded to the housing 21 of the battery cell 20. At the same time, the third plate 13 can share the force with the first plate 11 and the second plate 12, thereby enhancing the modal and / or strength of the entire battery pack.

[0096] It should be noted that the third plate 13, the first plate 11, and the second plate 12 can be integrally formed, which is beneficial to enhancing the overall load-bearing performance of the cold plate 10. Please refer to... Figure 11 As shown, when the cold plate 10 is located between the two battery cells 20, the first plate 11, the second plate 12, and the third plate 13 are arranged in an "I" shape; when the cold plate 10 is located on one side of the battery cell 20, the first plate 11, the second plate 12, and the third plate 13 are arranged in a "C" shape.

[0097] In some embodiments, see Figure 13 As shown, the battery pack also includes a base plate 51 and a side beam 52 extending from the circumferential edge of the base plate 51 in a first direction away from the base plate 51. The base plate 51 and the side beam 52 together enclose a receiving space, which is suitable for accommodating the cold plate 10 and the battery cell 20.

[0098] Please combine them together Figure 14 As shown, the side beam 52 is hollow inside and forms a second exhaust channel 521, which is connected to the first exhaust channel 121.

[0099] The battery pack also includes a second explosion-proof valve 53, which is located on the side of the side beam 52 away from the receiving space.

[0100] Please combine Figure 13 As shown, by bonding the casing 21 of the battery cell 20 to the cold plate 10, the first explosion-proof valve 23 can be integrated with the first exhaust channel 121 through the exhaust port 122. By forming a second exhaust channel 521 inside the side beam 52, the second exhaust channel 521 is connected to the first exhaust channel 121 of the cold plate 10. When the battery cell 20 experiences thermal runaway, the first explosion-proof valve 23 opens, and the gas generated by thermal runaway enters the first exhaust channel 121 through the exhaust port 122 for the first cooling, and then enters the second exhaust channel 521 through the first exhaust channel 121 for the second cooling. Finally, the gas at room temperature is discharged through the second explosion-proof valve 53, which improves the depressurization speed of the battery pack and enhances the safety performance of the battery pack.

[0101] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery pack, characterized in that, include: The cold plate includes a first plate and a second plate. The second plate is disposed on one side of the first plate in a first direction. The second plate is formed by extending the first plate in a second direction away from the first plate. The first plate is hollow inside and forms a cooling channel. The second plate is hollow inside and forms a first exhaust channel. A plurality of exhaust holes are opened on both sides of the second plate in a second direction. The exhaust holes are connected to the first exhaust channel. The battery cell has a convex-shaped structure and is disposed between two adjacent cold plates; The battery cell includes: The housing includes a first stepped portion and a second stepped portion, wherein the second stepped portion extends from one side of the first stepped portion in a first direction toward a direction away from the first stepped portion; The pole post is disposed on the side of the first stepped portion away from the second stepped portion along a first direction; The first explosion-proof valve is disposed on both sides of the second step in the second direction. The housing includes a first connecting surface and a second connecting surface. The first connecting surface is disposed on both sides of the first stepped portion in a second direction. The second connecting surface is disposed on the side of the first stepped portion close to the second stepped portion in a first direction, that is, disposed at the shoulder position of the convex-shaped cell structure. The first connecting surface and the second connecting surface are adhesive surfaces and / or heat dissipation surfaces. The first step portion is bonded to the first plate body on both sides in the second direction, and the second step portion is bonded to the second plate body on both sides in the second direction; The first explosion-proof valve and the exhaust port are arranged opposite each other along the second direction.

2. The battery pack according to claim 1, characterized in that, The first connecting surface is disposed opposite to the first plate body along the second direction, and the first connecting surface is adapted to be bonded and fixed to the first plate body; The second connecting surface is disposed opposite to the second plate body along the first direction, and the second connecting surface is adapted to be bonded and fixed to the second plate body.

3. The battery pack according to claim 1, characterized in that, The battery cell also includes a blue film, which is adapted to cover the casing; The blue film has a first window and a second window; the first window is disposed between the first connecting surface and the first plate, and the first window is adapted to accommodate a first adhesive layer, which is adapted to bond the first connecting surface to one side of the first plate in a first direction. The second window is disposed between the second connecting surface and the second plate body. The second window is adapted to accommodate the second adhesive layer, which is adapted to bond the second connecting surface and the second plate body to the side of the first step portion along the first direction.

4. The battery pack according to claim 3, characterized in that, The first adhesive layer is made of a thermally conductive material.

5. The battery pack according to claim 3, characterized in that, The cooling channel and the first exhaust channel are arranged opposite to each other along a first direction; The second adhesive layer is made of a thermally conductive material.

6. The battery pack according to claim 3, characterized in that, The blue film includes a first spiral surface and a second spiral surface, the first spiral surface being adapted to enclose and form the first window, and the second spiral surface being adapted to enclose and form the second window; The battery pack further includes a first spiral-shaped adhesive baffle and a second spiral-shaped adhesive baffle; the first spiral-shaped adhesive baffle is bonded to the first spiral-shaped surface, and the first spiral-shaped adhesive baffle is adapted to limit the first adhesive layer together with the first spiral-shaped surface; the second spiral-shaped adhesive baffle is bonded to the second spiral-shaped surface, and the second spiral-shaped adhesive baffle is adapted to limit the second adhesive layer together with the second spiral-shaped surface.

7. The battery pack according to claim 6, characterized in that, The widths of the first and second spiral surfaces are L, where L satisfies 5 mm ≤ L ≤ 10 mm.

8. The battery pack according to claim 1, characterized in that, The cold plate also includes a third plate body, which is disposed on the side of the first plate body away from the second plate body along a first direction. The third plate body is formed by extending the first plate body away from the first plate body along a second direction. The third plate body is adapted to abut against the side of the first step portion away from the second step portion along the first direction.

9. The battery pack according to any one of claims 1-8, characterized in that, The battery pack also includes a base plate and a side beam extending from the circumferential edge of the base plate in a first direction away from the base plate. The base plate and the side beam together enclose a receiving space, which is suitable for accommodating the cold plate and the battery cell. The side beam is hollow inside and forms a second exhaust channel, which is connected to the first exhaust channel. The battery pack also includes a second explosion-proof valve, which is located on the side of the side beam away from the receiving space.

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