Battery and vehicle

Abstract

The application provides a battery and a vehicle. The battery comprises a shell, two battery cells, a connecting cover plate and a plurality of explosion-proof valves. The shell is sleeved outside the two battery cells. The connecting cover plate is connected with the shell and is arranged between the two battery cells. The plurality of explosion-proof valves are arranged at the bottom of the shell. The two battery cells of the application share the connecting cover plate, thereby reducing external electrical connections, improving the utilization rate of the overall package space and reducing the manufacturing cost. At the same time, the plurality of explosion-proof valves are arranged at the bottom of the shell, so that the pole columns of the two battery cells are located at different sides, thereby avoiding the direct impact of the spewing material on the pole columns of the battery cells when the battery is in thermal runaway, and improving the safety of the battery.

Description

Technical Field

[0001] This application relates to the field of vehicles, and more particularly to batteries and vehicles. Background Technology

[0002] With the development of new energy vehicles, the use of blade battery packs has gradually become more widespread. Blade battery packs are mainly used in electric vehicles and energy storage systems. A blade battery is a specially designed lithium-ion battery that is both long and thin, and can be inserted into a battery pack like a "blade." Currently, blade battery cells mostly use a single-cell structure, with each cell requiring two separate cover plates and electrical connections via external connectors. However, external connectors increase the overall weight and assembly complexity of the pack, leading to increased costs. The single-cell structure also results in low space utilization within the battery pack; the small gaps between cells limit the amount of active material and result in lower energy density. Furthermore, the explosion-proof valves for single-cell structures are usually located on the cover plates. In the event of thermal runaway, ejected material can impact the cell terminals from the explosion-proof valves on the cover plates, potentially triggering a chain reaction and compromising safety.

[0003] Therefore, it is necessary to provide an improved battery and vehicle to solve the above problems. Utility Model Content

[0004] This application provides a battery and vehicle that are low in manufacturing cost and highly safe.

[0005] This application provides a battery, including: a housing, two battery cells, a connecting cover plate, and a plurality of explosion-proof valves. The housing is sleeved over the two battery cells, the connecting cover plate is connected to the housing and disposed between the two battery cells, and the plurality of explosion-proof valves are disposed at the bottom of the housing.

[0006] Furthermore, the housing includes a first housing and a second housing respectively fitted over the two battery cells, and the connecting cover is welded to the first housing and the second housing.

[0007] Furthermore, the number of the plurality of explosion-proof valves is two, respectively located at the bottom of the first housing and the second housing; the two explosion-proof valves are disposed off-center from the center of the first housing and the second housing.

[0008] Furthermore, each of the battery cells includes an electrode core and a first tab and a second tab connected to both ends of the electrode core. The connecting cover plate includes a composite electrode post, and the two sides of the composite electrode post are electrically connected to the first tab of one of the battery cells and the second tab of the other battery cell, respectively.

[0009] Furthermore, the battery also includes two side covers, which are respectively disposed at the ends of the two cells away from the connecting cover. The two side covers are electrically connected to the second tab of one of the cells and the first tab of the other cell, respectively.

[0010] Furthermore, each of the side cover plates includes an injection-molded cover plate body and a conductive electrode post and a sampling electrode post formed on the cover plate body. The conductive electrode post and the sampling electrode post are simultaneously electrically connected to the second tab of one of the battery cells or the first tab of the other battery cell.

[0011] Furthermore, the connecting cover plate includes a light aluminum sheet welded to the housing, an injection molded part formed between the light aluminum sheet and the composite electrode post, and two lower plastic parts extending from the light aluminum sheet to both sides, the two lower plastic parts abutting against the composite electrode post and the injection molded part.

[0012] Furthermore, the electrode core is covered with an insulating film, which is disposed between the housing and the electrode core; the housing is provided with a coating, which has an opening at the explosion-proof valve.

[0013] Furthermore, the composite electrode post includes an aluminum electrode post electrically connected to the first tab of one of the battery cells and a copper electrode post electrically connected to the second tab of the other battery cell, wherein the first tab is an aluminum tab and the second tab is a copper tab.

[0014] This application also provides a vehicle including the aforementioned battery.

[0015] The two battery cells in this application share a common connecting cover, reducing external electrical connectors, improving overall pack space utilization, and lowering manufacturing costs. Simultaneously, multiple explosion-proof valves are positioned at the bottom of the casing, placing them on different sides from the terminals of the two battery cells. This prevents ejected material from directly impacting the cell terminals in the event of thermal runaway, thus enhancing battery safety. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of a battery according to an exemplary embodiment of this application.

[0017] Figure 2 This is a bottom view of the battery in this application.

[0018] Figure 3 yes Figure 1 The image shows a magnified view of the battery at point C.

[0019] Figure 4 yes Figure 1 The image shows a magnified view of the battery at the side cover.

[0020] Figure 5 This is a side view of the battery in this application.

[0021] Figure 6 This is a schematic diagram of the battery casing of this application having a coating.

[0022] Explanation of icon numbers:

[0023] 10. Housing; 101. Sheath; 1011. Opening; 11. First housing; 12. Second housing; 20. Battery cell; 21. Electrode core; 22. First electrode tab; 23. Second electrode tab; 24. Insulating film; 30. Connecting cover plate; 31. Composite electrode post; 311. Aluminum electrode post; 312. Copper electrode post; 32. Plain aluminum sheet; 33. Injection molded part; 34. Lower plastic part; 341. Accommodation gap; 40. Explosion-proof valve; 50. Side cover plate; 51. Cover plate body; 52. Conductive electrode post; 53. Sampling electrode post; 54. Plastic part. Detailed Implementation

[0024] The technical solutions in the embodiments (or "implementations") of this application will be clearly and completely described herein with reference to the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0025] If the embodiments of this application contain terms relating to directional indications or positional relationships (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships and movements between components in a specific posture (as shown in the attached figures); if the specific posture changes, the directional indications or positional relationships will also change accordingly. Furthermore, the terms "first" and "second" used in the embodiments of this application are only for descriptive convenience and should not be construed as indicating or implying relative importance.

[0026] See Figures 1 to 2 As shown, this application provides a battery including a casing 10, two battery cells 20, a connecting cover 30, multiple explosion-proof valves 40, and two side cover plates 50. The casing 10 is sleeved over the two battery cells 20. The connecting cover plate 30 is connected to the casing 10 and disposed between the two battery cells 20. The multiple explosion-proof valves 40 are disposed at the bottom of the casing 10. The two side cover plates 50 are respectively disposed at the ends of the two battery cells 20 away from the connecting cover plate 30.

[0027] The housing 10 includes a first housing 11 and a second housing 12. The first housing 11 and the second housing 12 are respectively fitted over the two battery cells 20. The split housing design facilitates individual assembly and maintenance, reducing manufacturing difficulty. Both the first housing 11 and the second housing 12 are welded to the connecting cover plate 30 to ensure the sealing and structural strength of the connecting cover plate 30 with the first housing 11 and the second housing 12.

[0028] In some embodiments, the first housing 11 and the second housing 12 are connected to the connecting cover plate 30 by ultrasonic welding, friction welding or laser welding, etc.

[0029] The housing 10 is provided with a membrane 101, and the membrane 101 has an opening 1011 at the explosion-proof valve 40. The first housing 11 and the second housing 12 are each provided with an opening 1011, so that the pressure relief function of the explosion-proof valve 40 is not affected. The opening 1011 on the bottom of the first housing 11 is eccentrically positioned, and the opening 1011 on the bottom of the second housing 12 is eccentrically positioned.

[0030] According to the embodiments of this application, the coating 101 may be a gold film, a blue film, or an insulating film, etc. Alternatively, instead of providing the coating 101, an insulating coating, such as epoxy resin or silicone, may be sprayed onto the outside of the housing 10.

[0031] See Figure 3 As shown, each battery cell 20 includes a core 21, a first tab 22, and a second tab 23. The first tab 22 and the second tab 23 are electrically connected to both ends of the core 21. The two sides of the connecting cover plate 30 are electrically connected to the first tab 22 of one battery cell 20 and the second tab 23 of the other battery cell 20, respectively.

[0032] According to the embodiments of this application, the first electrode 22 is an aluminum electrode, and the second electrode 23 is a copper electrode.

[0033] Both electrode cores 21 are covered with an insulating film 24, which is disposed between the housing 10 and the electrode cores 21 to insulate them from each other. According to an embodiment of this application, the insulating film 24 can be Mylar (polyester film). The double-layer protection of the insulating film 24 and the coating 101 prevents short circuits between the housing 10 and the electrode cores 21.

[0034] The connecting cover plate 30 includes a composite electrode post 31, an aluminum sheet 32, an injection molded part 33, and two lower plastic parts 34. The two sides of the composite electrode post 31 are electrically connected to the first tab 22 of one battery cell 20 and the second tab 23 of the other battery cell 20, respectively. The aluminum sheet 32 ​​is simultaneously welded to both the first housing 11 and the second housing 12. The aluminum sheet 32, combined with the injection molded part 33, achieves both electrical insulation and structural support functions. The injection molded part 33 is formed between the aluminum sheet 32 ​​and the composite electrode post 31.

[0035] The composite electrode 31 includes an aluminum electrode 311 and a copper electrode 312. The aluminum electrode 311 is electrically connected to the first tab 22 of one of the battery cells 20. The copper electrode 312 is electrically connected to the second tab 23 of the other battery cell 20. The aluminum electrode 311 is laser-welded to the aluminum tab near the connecting cover plate 30, and the copper electrode 312 is laser-welded to the copper tab near the connecting cover plate 30. The aluminum electrode 311 and the copper electrode 312 are connected on opposite sides, matching the corresponding tab materials to reduce contact resistance.

[0036] In some embodiments, the composite electrode 31 may employ a transition layer (such as a nickel layer) to mitigate aluminum-copper galvanic corrosion. Conductive adhesive is applied to the connection points between the first tab 22 and the second tab 23 and the composite electrode 31 to enhance contact reliability.

[0037] The composite electrode 31 is assembled with the aluminum sheet 32 ​​using a nano-injection molding process to form an injection molded part 33. According to other embodiments of this application, the injection molded part 33 may use a ceramic filler material to enhance its high-temperature resistance. The composite electrode 31 and the aluminum sheet 32 ​​are insulated and fixed using PPS (polyphenylene sulfide). Furthermore, other similar processes can achieve similar objectives.

[0038] Two lower plastic inserts 34 extend from the aluminum sheet 32 ​​to both sides and abut against the composite electrode post 31 and the injection molded part 33. The lower plastic inserts 34 fix the composite electrode post 31, prevent internal movement of the composite electrode post 31, improve structural stability, and insulate the electrode core 21 from the aluminum sheet 32. At the same time, a receiving gap 341 is provided between the lower plastic inserts 34 and the electrode core 21, and the first electrode tab 22 and the second electrode tab 23 of the two electrode cores 21 near the connecting cover plate 30 are located in the receiving gap 341.

[0039] In some embodiments, the insulating film 24 is also disposed between the housing 10 and the lower plastic 34, and the insulating film 24 and the lower plastic 34 are assembled by a hot-melt process.

[0040] According to an embodiment of this application, the number of explosion-proof valves 40 is two. The two explosion-proof valves 40 are respectively disposed at the bottom of the first housing 11 and the second housing 12. In some embodiments, the explosion-proof valves 40 are assembled or formed using various processes, such as welding, etching, or stamping, to the bottom of the housing 10.

[0041] Preferably, the two explosion-proof valves 40 are offset from the center of the first housing 11 and the second housing 12 to improve the insulation of the exposed parts of the explosion-proof valves 40. Specifically, the length of the explosion-proof valve 40 at the bottom of the first housing 11 from the side cover plate 50 at the end of the first housing 11 is defined as A, and the length of the explosion-proof valve 40 at the bottom of the first housing 11 from the connecting cover plate 30 is defined as B. The eccentricity means that the dimension A ≠ B. In the embodiment of this application, A < B. The eccentric arrangement of the explosion-proof valves 40 extends the creepage distance between adjacent cells 20, which is beneficial to the overall insulation of the package.

[0042] In some other embodiments, the explosion-proof valve 40 may also be located at the center of the bottom of the first housing 11 or the second housing 12. The explosion-proof valve 40 is located at the bottom of the housing 10 and on a different side from the composite pole 31, which is beneficial for safety in the event of thermal runaway of the entire package. The number of multiple explosion-proof valves 40 may be greater than two and designed as a porous array structure to disperse the pressure relief path.

[0043] join Figures 4 to 6 As shown, the two side covers 50 are electrically connected to the second tab 23 of one battery cell 20 and the first tab 22 of the other battery cell 20, respectively. The two side covers 50 are welded to the first housing 11 and the second housing 12, respectively. Each side cover 50 includes a cover body 51, a conductive electrode post 52, and a sampling electrode post 53. The cover body 51 is injection molded. The conductive electrode post 52 and the sampling electrode post 53 are formed on the cover body 51 by nano-injection molding.

[0044] In some embodiments, the cover plate body 51 may be made of high-temperature resistant materials such as PPS or LCP (liquid crystal polymer).

[0045] The conductive electrode post 52 is larger than the sampling electrode post 53. The conductive electrode post 52 has a conductive function and can be electrically connected. The sampling electrode post 53 has a signal acquisition function and can acquire voltage signals, avoiding signal acquisition from interference by large currents, which is beneficial to the accuracy of the vehicle's range. The conductive electrode post 52 and the sampling electrode post 53 are simultaneously electrically connected to the second tab 23 of one of the battery cells 20 or the first tab 22 of the other battery cell 20.

[0046] The side cover 50 also includes a plastic part 54, which abuts against the cover body 51 and the electrode core 21 to fix the position of the electrode core 21. The plastic part 54 and the insulating film 24 are assembled by a hot-melt process to insulate the cover body 51 and the electrode core 21.

[0047] This application also provides a vehicle including the battery as described above. The battery may be a blade battery used in new energy vehicles.

[0048] The two battery cells 20 in this application share a connecting cover 30, which reduces the number of external electrical connector cover plates, lowers manufacturing costs, improves space utilization between the battery cells 20, and allows for the filling of more active material within the space between the battery cells 20, thereby improving space utilization and energy density. Simultaneously, multiple explosion-proof valves 40 are arranged at the bottom of the housing 10, placing them on different sides from the terminals of the two battery cells 20. This prevents ejected material from directly impacting the terminals of the battery cells 20 in the event of thermal runaway, thus improving battery safety.

[0049] It should be noted that the technical solutions or features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A battery, characterized in that, include: The device comprises a housing, two battery cells, a connecting cover plate, and multiple explosion-proof valves. The housing is fitted over the two battery cells, the connecting cover plate is connected to the housing and positioned between the two battery cells, and the multiple explosion-proof valves are located at the bottom of the housing.

2. The battery according to claim 1, characterized in that, The housing includes a first housing and a second housing respectively fitted over the two battery cells, and the connecting cover is welded to the first housing and the second housing.

3. The battery according to claim 2, characterized in that, The number of explosion-proof valves is two, respectively located at the bottom of the first housing and the second housing; the two explosion-proof valves are positioned off-center from the center of the first housing and the second housing.

4. The battery according to claim 1, characterized in that, Each of the battery cells includes a core and a first tab and a second tab connected to both ends of the core. The connecting cover includes a composite post, and the two sides of the composite post are electrically connected to the first tab of one of the battery cells and the second tab of the other battery cell, respectively.

5. The battery according to claim 4, characterized in that, The battery also includes two side covers, which are respectively disposed at the ends of the two cells away from the connecting cover. The two side covers are electrically connected to the second tab of one of the cells and the first tab of the other cell.

6. The battery according to claim 5, characterized in that, Each of the side cover plates includes an injection-molded cover plate body and a conductive electrode post and a sampling electrode post formed on the cover plate body. The conductive electrode post and the sampling electrode post are simultaneously electrically connected to the second tab of one of the battery cells or the first tab of the other battery cell.

7. The battery according to claim 4, characterized in that, The connecting cover plate includes an aluminum sheet welded to the housing, an injection molded part formed between the aluminum sheet and the composite electrode, and two lower plastic parts extending from the aluminum sheet to both sides, the two lower plastic parts abutting against the composite electrode and the injection molded part.

8. The battery according to claim 4, characterized in that, The electrode core is covered with an insulating film, which is disposed between the housing and the electrode core; the housing is provided with a coating, which has an opening at the explosion-proof valve.

9. The battery according to claim 4, characterized in that, The composite electrode post includes an aluminum electrode post electrically connected to the first tab of one of the battery cells and a copper electrode post electrically connected to the second tab of the other battery cell, wherein the first tab is an aluminum tab and the second tab is a copper tab.

10. A vehicle, characterized in that, Includes the battery as described in any one of claims 1-9.

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