Battery device

Abstract

The embodiment of the utility model provides a battery device which comprises a box body, at least two cylindrical battery packs located in the box body, a supporting part, a support, a connecting bar and a conducting bar, the box body comprises a bottom plate, each cylindrical battery pack comprises at least one cylindrical battery, and the axial direction of the cylindrical battery is parallel to the bottom plate; the at least two cylindrical battery packs are arranged in a stacked mode in the direction perpendicular to the bottom plate, the supporting part comprises a battery supporting plate and a support supporting plate, the battery supporting plate is arranged between every two adjacent cylindrical battery packs, the support is fixed to the support supporting plate, and the connecting bar and the conducting bar are fixedly connected at the position of the support. And the conducting bar is fixedly connected with the polarity terminal of the cylindrical battery. The problem that the position deviation between the conducting bar and the support is large under the condition that the middle conducting bar and the conducting bar are vertically arranged is solved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery device. Background Technology

[0002] The battery assembly uses connecting busbars to connect different battery packs in series and / or parallel to form a complete battery pack. Connecting busbars also serve to extract the electrical energy from the complete battery pack. The battery packs are connected to the connecting busbars via conductive busbars, which are then fixedly connected at a support.

[0003] In related technologies, supports are fixed to beams inside the box girder. When fixing the connecting busbar and the conductive busbar, the conductive busbar needs to be extended to the support position to connect with the connecting busbar. When the conductive busbar is vertically arranged, the positions of the conductive busbar and the support are prone to significant deviation, leading to misalignment during subsequent fixing to the connecting busbar. If the conductive busbar and the connecting busbar are forcibly fixed in this misaligned state, the conductive busbar may be torn off.

[0004] In view of this, it is urgent for those skilled in the art to solve the problem that the positions of the conductive busbar and the support are prone to large deviations when the conductive busbar is arranged vertically. Utility Model Content

[0005] To solve the above-mentioned technical problems, this application provides a battery device, the battery device including a housing and at least two sets of cylindrical battery packs located in the housing, the housing including a bottom plate, each set of cylindrical battery packs including at least one cylindrical battery, the axis of the cylindrical battery being parallel to the bottom plate, and at least two sets of cylindrical battery packs being stacked in a direction perpendicular to the bottom plate.

[0006] The battery device further includes a support portion, which includes a battery support plate and a support plate. The battery support plate is disposed between two adjacent cylindrical battery packs. In a direction perpendicular to the axial direction of the cylindrical battery and parallel to the base plate, the support plate extends beyond one end of the cylindrical battery pack.

[0007] The battery device further includes a support, a connecting bar, and a conductive bar. The support is fixed to the support plate, the connecting bar and the conductive bar are fixedly connected at the support, and the conductive bar is electrically connected to the polarity terminal of the cylindrical battery.

[0008] In the aforementioned battery device, since the battery support plate of the support unit is located between two adjacent cylindrical battery packs, the cylindrical batteries are fixed relative to the support unit. At the same time, the support is assembled and fixed on the support plate of the support unit, so the support is also fixed relative to the support unit. Therefore, both the cylindrical batteries and the support are fixed with the support unit as the fixing reference. The same fixing reference makes the assembly dimension chain between the cylindrical batteries and the conductive busbars electrically connected to the cylindrical batteries and the support shorter. Therefore, it is not easy for large positional deviations to accumulate between the conductive busbars and the support, thus solving the problem of large positional deviations between the conductive busbars and the support when the conductive busbars are arranged vertically. Attached Figure Description

[0009] Figure 1 A top view of a partial structure of one embodiment of the battery device provided in this application;

[0010] Figure 2 for Figure 1 A magnified view of a portion of the image;

[0011] Figure 3 for Figure 1 A three-dimensional view of the middle section structure;

[0012] Figure 4 for Figure 3 A magnified view of a portion of the image;

[0013] Figure 5 for Figure 4 A three-dimensional view of the central support section;

[0014] Figure 6 for Figure 4 A magnified view of a portion of the image;

[0015] Figure 7 for Figure 6 A three-dimensional diagram showing the assembly of the support on the basis of the previous model;

[0016] Figure 8 for Figure 7 Another perspective view.

[0017] The annotations in the attached figures are explained as follows:

[0018] 100 enclosure, 101 base plate;

[0019] 200 cylindrical battery;

[0020] 300 Support section, 301 Battery support plate, 302 Support plate, 302a First support area, 302b Second support area, 302c Fixing area, 302d First step, 302e Second step, A Inlet, B Locking hole, 303 Support leg.

[0021] 400 Support, 401 Interlocking Part, 402 Connecting Part.

[0022] 500 connectors;

[0023] 600 busbar;

[0024] 700 intermediate conductive busbar;

[0025] 800 Battery Management Unit. Detailed Implementation

[0026] This application provides a battery device. To enable those skilled in the art to better understand the technical solution of this application, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments.

[0027] like Figure 1 and Figure 2 As shown, the battery device provided in this application includes a housing 100 and at least two sets of cylindrical battery packs located within the housing 100. The housing 100 includes a base plate 101. Each set of cylindrical battery packs includes at least one cylindrical battery 200. The axial direction of the cylindrical battery 200 is parallel to the base plate 101, and the at least two sets of cylindrical battery packs are stacked in a direction perpendicular to the base plate 101.

[0028] Specifically, Figure 1 The system comprises eight sets of cylindrical battery packs, arranged in four rows of two, with the four rows arranged sequentially along the first direction. Two sets of cylindrical battery packs within the same row are stacked in a direction perpendicular to the base plate 101. Each set of cylindrical battery packs includes multiple cylindrical cells 200, with the axial direction of each cylindrical cell 200 along the first direction, and the cylindrical cells 200 of each set arranged sequentially along the second direction. The first and second directions are perpendicular to each other and parallel to the base plate 101. In practice, the number of rows of cylindrical battery packs can be less than four or more than four. Each row of cylindrical battery packs can also have more than two layers.

[0029] like Figure 3 As shown, the battery device also includes a conductive bus 600, a connecting bus 500, and a support 400. The cylindrical battery 200 has polarized terminals for electrical connection to the conductive bus 600 to transmit current from the cylindrical battery 200. The polarized terminals can be the casing of the cylindrical battery 200 or terminals provided on the casing. The conductive bus 600 can be electrically connected to the casing of the cylindrical battery 200, which serves as a polarized terminal, or it can be electrically connected to the terminals of the cylindrical battery 200. Figure 3The system also includes several intermediate conductive bars 700, each of which connects two adjacent cylindrical batteries 200 in series. The intermediate conductive bars 700 can be electrically connected to the terminals of the two adjacent cylindrical batteries 200, or they can include a terminal connection portion and a housing connection portion. The terminal connection portion is electrically connected to the terminal of one of the two adjacent cylindrical batteries 200, and the housing connection portion is electrically connected to the housing of the other of the two adjacent cylindrical batteries 200. Since the axial direction of the cylindrical batteries 200 is parallel to the base plate 101, the conductive bars 600 and intermediate conductive bars 700, which are electrically connected to the polarity terminals of the cylindrical batteries 200, are arranged vertically. That is, the conductive bars 600 and intermediate conductive bars 700 are arranged approximately perpendicular to the base plate 101.

[0030] The conductive bus 600 and the connecting bus 500 are fixedly connected at the support 400. The connecting bus 500 is used to connect multiple cylindrical battery packs in series and / or in parallel to form a battery module, and also to connect the battery module to the battery management unit 800 to realize the charging and discharging of the battery module. In the figure, the connection position of the conductive bus 600 and the connecting bus 500 is located inside the support 400. In this way, the support 400 protects the connection position of the conductive bus 600 and the connecting bus 500. Of course, the connection position of the conductive bus 600 and the connecting bus 500 is not limited to inside the support 400. Specifically, the materials of the conductive bus 600 and the connecting bus 500 can be aluminum, copper, etc. The materials of the conductive bus 600 and the connecting bus 500 can be the same or different.

[0031] like Figures 4-6 As shown, the battery device also includes a support portion 300, which includes a battery support plate 301 and a support plate 302. The battery support plate 301 is disposed between two adjacent cylindrical battery packs; specifically, the battery support plate 301 and the cylindrical battery packs can be glued together. In a direction perpendicular to the axial direction of the cylindrical battery 200 and parallel to the base plate 101 (i.e., in the second direction in the figure), the support plate 302 extends beyond one end of the cylindrical battery pack.

[0032] The battery device provided in this application, because the battery support plate 301 of the support portion 300 is located between two adjacent cylindrical battery packs, the cylindrical battery 200 is fixed relative to the support portion 300. Simultaneously, the support 400 is assembled and fixed on the support support plate 302 of the support portion 300, so the support 400 is also fixed relative to the support portion 300. Therefore, both the cylindrical battery 200 and the support 400 use the support portion 300 as a fixing reference. This shared fixing reference results in a shorter assembly dimension chain between the cylindrical battery 200 and the conductive bus 600 and support 400 electrically connected to the cylindrical battery 200. Consequently, large positional deviations are less likely to accumulate between the conductive bus 600 and the support 400, solving the problem of large positional deviations between the conductive bus 600 and the support 400 when the conductive bus 600 is arranged vertically. Large positional deviations between the conductive bus 600 and the support 400 affect the connection reliability between the conductive bus 600 and the connecting bus 500, and may even cause the conductive bus 600 to break. This application avoids these risks.

[0033] Specifically, such as Figure 5 As shown, the battery support plate 301 is a corrugated plate. Both the side of the battery support plate 301 facing the upper cylindrical battery pack and the side facing the lower cylindrical battery pack have arc-shaped grooves adapted to the cylindrical surfaces of the cylindrical batteries 200. The cylindrical surfaces of each cylindrical battery 200 in the upper cylindrical battery pack are correspondingly positioned in the arc-shaped grooves on the upper side of the battery support plate 301, and the arc-shaped grooves on the lower side of the battery support plate 301 are correspondingly positioned on the cylindrical surfaces of each cylindrical battery 200 in the lower cylindrical battery pack.

[0034] Specifically, such as Figure 5 As shown, in the arrangement direction of the cylindrical batteries 200 of the cylindrical battery pack (i.e., in the second direction in the figure), both ends of the battery support plate 301 are bent toward the base plate 101 to form support legs 303, and the support legs 303 are fixedly connected to the base plate 101. More specifically, both ends of the battery support plate 301 are first bent toward the base plate 101 to form a vertically bent portion that is approximately perpendicular to the base plate 101, and then bent horizontally to form a horizontally bent portion that is approximately parallel to the base plate 101. The horizontally bent portion is fixedly connected to the base plate 101 by fasteners.

[0035] In some embodiments, the support plate 302 and the battery support plate 301 are assembled and fixed together. That is, the support plate 302 and the battery support plate 301 are formed separately and then fixedly connected together, as shown in the illustrated embodiment. The support plate 302 and the battery support plate 301 are preferably detachably fixed to facilitate the replacement of the support plate 302.

[0036] In some embodiments, the support plate 302 and the battery support plate 301 are integrally formed. In this way, there is no assembly error between the support plate 302 and the battery support plate 301, which is more conducive to shortening the assembly dimension chain between the conductive bus 600 and the support 400, and more conducive to reducing the positional deviation between the conductive bus 600 and the support 400.

[0037] In some embodiments, such as 4- Figure 7 As shown, each cylindrical battery pack corresponds to at least one support 400. The support plate 302 includes a first support area 302a and a second support area 302b. The first support area 302a supports the support 400 corresponding to the upper layer of cylindrical battery packs, and the second support area 302b supports the support 400 corresponding to the lower layer of cylindrical battery packs. With this design, the same support plate 302 can simultaneously support the supports 400 corresponding to both upper and lower cylindrical battery packs, making the support function more integrated. Therefore, it is more conducive to saving the volume occupied by the support structure within the housing 100 and to improving the energy density of the battery device.

[0038] In some embodiments, such as Figure 6 As shown, in the direction perpendicular to the axial direction of the cylindrical battery 200 and parallel to the base plate 101 (i.e., in the second direction in the figure), the second support area 302b is farther away from one end of the cylindrical battery pack than the first support area 302a. The second support area 302b is closer to the base plate 101 than the first support area 302a. This lowers the center of gravity of the support plate 302, resulting in less stress at the connection point between the support plate 302 and the battery support plate 301, thus improving connection reliability.

[0039] In some embodiments, such as Figure 6 As shown, the orthographic projections of the first support area 302a and the battery support plate 301 on the base plate 101 at least partially overlap, while the orthographic projections of the second support area 302b and the battery support plate 301 on the base plate 101 are offset from each other. In the direction parallel to the axial direction of the cylindrical battery 200 (i.e., in the first direction in the figure), the width of the second support area 302b is greater than the width of the first support area 302a. With this design, the strength of the second support area 302b is higher than that of the first support area 302a. Since the orthographic projections of the first support area 302a and the battery support plate 301 on the base plate 101 at least partially overlap, the lower part of the first support area 302a is supported by the battery support plate 301, therefore, the strength of the first support area 302a can be lower. However, since the orthographic projections of the second support area 302b and the battery support plate 301 on the base plate 101 are offset from each other, the lower part of the second support area 302b is not supported by the battery support plate 301, therefore, the strength of the second support area 302b needs to be higher.

[0040] In some embodiments, such as Figure 6As shown, a fixing area 302c, which is fixed to the battery support plate 301, is provided between the first support area 302a and the second support area 302b. The fixing area 302c is closer to the base plate 101 than the first support area 302a, and a first step 302d is formed between the fixing area 302c and the support area. The second support area 302b is closer to the base plate 101 than the fixing area 302c, and a second step 302e is formed between the second support area 302b and the fixing area 302c. With this design, the support plate 302 has a tortuous structure, resulting in higher overall strength. Moreover, the center is lower, leading to more reasonable stress distribution. Furthermore, the first support area 302a can avoid the upwardly protruding part of the upward-facing battery support plate 301.

[0041] In some embodiments, the height H1 of the first step 302d in the direction perpendicular to the base plate 101 is in the range of 1mm ≤ H1 ≤ 5mm. Within this range, the strength of the support plate 302 can be well guaranteed.

[0042] In some embodiments, the height H2 of the second step 302e in the direction perpendicular to the base plate 101 is in the range of 1mm ≤ H2 ≤ 5mm. Within this range, the strength of the support plate 302 can be well guaranteed.

[0043] In some embodiments, such as Figure 8 As shown, the support plate 302 is provided with locking holes B, and the support 400 is provided with locking parts 402, which are engaged with the locking holes B. This facilitates the assembly of the support 400 and the support plate 302 and ensures a high degree of reliability in their connection. In the illustrated embodiment, the first support area 302a and the second support area 302b are each provided with two locking holes B. The two locking holes B of the first support area 302a are engaged with the two locking parts 402 of one support 400, and the two locking holes B of the second support area 302b are engaged with the two locking parts 402 of the other support 400.

[0044] Specifically, the ratio of the total projected area of ​​the locking holes B on the support plate 302 onto the base plate 101 to the total projected area of ​​the support plate 302 onto the base plate 101 ranges from 30% to 70%, specifically 30%, 40%, 50%, 60%, and 70%. The total projected area of ​​the locking holes B on the support plate 302 onto the base plate 101 refers to the sum of the projected areas of all locking holes B on the support plate 302 onto the base plate 101. If this ratio is too large, it will affect the strength of the support plate 302; if this ratio is too small, it will affect the strength of the locking portion 402 on the support 400. The above range balances the strength of both the support plate 302 and the locking portion 402.

[0045] In some embodiments, such as Figure 8As shown, in addition to the aforementioned locking holes B, the support plate 302 also has an insertion hole A. The support 400 has an insertion portion 401 that inserts into the insertion hole A. This further improves the connection reliability between the support 400 and the support plate 302. In the illustrated embodiment, the first support area 302a has one insertion hole A located between the two locking holes B, and the second support area 302b has one insertion hole A located between the two locking holes B.

[0046] Specifically, the ratio of the total projected area of ​​the insertion holes A on the base plate 101 on the support plate 302 to the total projected area of ​​the support plate 302 on the base plate 101 ranges from 5% to 20%, specifically 5%, 10%, 15%, and 20%. The total projected area of ​​the insertion holes A on the base plate 101 on the support plate 302 refers to the sum of the projected areas of all insertion holes A on the support plate 302 on the base plate 101. If this ratio is too large, it will affect the strength of the support plate 302; if this ratio is too small, it will affect the strength of the insertion portion 401 on the support 400. The above range can balance the strength of the support plate 302 and the strength of the insertion portion 401.

[0047] The above examples illustrate the principles and implementation methods of this application. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A battery device, characterized in that, The battery device includes a housing (100) and at least two sets of cylindrical battery packs located within the housing (100). The housing (100) includes a base plate (101). Each set of cylindrical battery packs includes at least one cylindrical battery (200). The axial direction of the cylindrical battery (200) is parallel to the base plate (101). The at least two sets of cylindrical battery packs are stacked in a direction perpendicular to the base plate (101). The battery device also includes a support (300), which includes a battery support plate (301) and a support plate (302). The battery support plate (301) is disposed between two adjacent cylindrical battery packs. In a direction perpendicular to the axial direction of the cylindrical battery (200) and parallel to the base plate (101), the support plate (302) extends beyond one end of the cylindrical battery pack. The battery device further includes a support (400), a connecting bar (500), and a conductive bar (600). The support (400) is fixed on the support plate (302). The connecting bar (500) and the conductive bar (600) are fixedly connected at the support (400). The conductive bar (600) is electrically connected to the polarity terminal of the cylindrical battery (200).

2. The battery device according to claim 1, characterized in that, The battery support plate (301) and the support plate (302) are separately formed and assembled and fixed.

3. The battery device according to claim 1, characterized in that, The battery support plate (301) and the support plate (302) are integrally formed.

4. The battery device according to claim 1, characterized in that, Each of the cylindrical battery packs corresponds to at least one support (400). The support plate (302) includes a first support area (302a) and a second support area (302b). The first support area (302a) is used to support the support (400) corresponding to the upper layer of cylindrical battery packs, and the second support area (302b) is used to support the support (400) corresponding to the lower layer of cylindrical battery packs.

5. The battery device according to claim 4, characterized in that, In a direction perpendicular to the axial direction of the cylindrical battery (200) and parallel to the base plate (101), the second support area (302b) is further away from one end of the cylindrical battery pack than the first support area (302a); the second support area (302b) is closer to the base plate (101) than the first support area (302a).

6. The battery device according to claim 4, characterized in that, The orthographic projections of the first support area (302a) and the battery support plate (301) on the base plate (101) overlap at least partially, and the orthographic projections of the second support area (302b) and the battery support plate (301) on the base plate (101) are offset from each other. In a direction parallel to the axial direction of the cylindrical battery (200), the width of the second support area (302b) is greater than the width of the first support area (302a).

7. The battery device according to claim 4, characterized in that, A fixing area (302c) for assembling and fixing with the support plate is provided between the first support area (302a) and the second support area (302b). The fixing area (302c) is closer to the base plate (101) than the first support area (302a). A first step (302d) is formed between the fixing area (302c) and the first support area (302a). The second support area (302b) is closer to the base plate (101) than the fixing area (302c). A second step (302e) is formed between the second support area (302b) and the fixing area (302c).

8. The battery device according to claim 7, characterized in that, In the direction perpendicular to the base plate (101), the height H1 of the first step (302d) is in the range of 1mm≤H1≤5mm.

9. The battery device according to claim 7, characterized in that, In the direction perpendicular to the base plate (101), the height H2 of the second step (302e) ranges from 1mm ≤ H2 ≤ 5mm.

10. The battery device according to claim 1, characterized in that, The support plate (302) is provided with a locking hole (B), and the support (400) is provided with a locking part (402), which is locked into the locking hole (B).

11. The battery device according to claim 10, characterized in that, The ratio of the total projected area of ​​the positioning hole (B) on the base plate (101) to the projected area of ​​the support plate (302) on the base plate (101) is 30%-70%.

12. The battery device according to claim 10, characterized in that, The support plate (302) is provided with a socket (A), and the support (400) is provided with an insertion part (401), which is inserted into the socket (A).

13. The battery device according to claim 12, characterized in that, The ratio of the total projected area of ​​the socket (A) on the base plate (101) to the projected area of ​​the support plate (302) on the base plate (101) is in the range of 5%-20%.

14. The battery device according to any one of claims 1-13, characterized in that, The battery support plate (301) is a corrugated plate. The side of the battery support plate (301) facing the upper layer of the cylindrical battery pack and the side facing the lower layer of the cylindrical battery pack are both formed with arc-shaped grooves that are adapted to the cylindrical surface of the cylindrical battery (200).

15. The battery device according to claim 14, characterized in that, In the arrangement direction of the cylindrical batteries (200) of the cylindrical battery pack, the two ends of the battery support plate (301) are bent toward the base plate (101) to form support legs (303), and the support legs (303) are fixedly connected to the base plate (101).

Images