Battery box and battery pack

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery box and a battery pack, the battery box comprises a box body and a first supporting beam, the box body comprises a front beam, a first side beam, a rear beam, a second side beam and a bottom plate, and the front beam, the first side beam, the rear beam and the second side beam are sequentially arranged on the bottom plate in an end-to-end mode and define a mounting cavity; the first supporting beam is located in the mounting cavity and is obliquely arranged relative to the bottom plate, one end of the first supporting beam is fixedly connected with the bottom plate, the other end of the first supporting beam is fixedly connected with the front beam, and the first supporting beam can play a good role in supporting the front beam, so that the anti-extrusion capability of the front beam is improved, and the front surface of the battery box body has better anti-extrusion capability; and the influence on the energy density of the battery pack is small.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery box and a battery pack. Background Art

[0002] At present, there are more and more cases of offset collisions of new energy vehicles, and the problem of extrusion of the front surface of the battery pack has received more and more attention. Since the anti-extrusion ability of the battery pack mainly comes from the battery box body, improving the anti-extrusion ability of the front surface of the battery box body is the key to improving the anti-extrusion ability of the front surface of the battery pack.

[0003] In the prior art, a method to improve the anti-extrusion capability of the front surface of the battery box body is to increase the thickness of the front beam of the battery box body. Although this method can improve the anti-extrusion capability of the front beam to a certain extent, the improvement effect is limited and it is easy to affect the energy density of the battery pack.

[0004] Therefore, there is an urgent need to provide a battery box and a battery pack to solve the above technical problems. Utility Model Content

[0005] The first object of the utility model is to provide a battery box, the front surface of the battery box body has good anti-extrusion ability and has little effect on the energy density of the battery pack.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Battery box, including:

[0008] The box body comprises a front beam, a first side beam, a rear beam, a second side beam and a bottom plate, wherein the front beam, the first side beam, the rear beam and the second side beam are sequentially connected end to end and arranged on the bottom plate to enclose a mounting cavity;

[0009] The first support beam is located in the installation cavity and is tilted relative to the bottom plate. One end of the first support beam is fixedly connected to the bottom plate, and the other end is fixedly connected to the front beam.

[0010] Optionally, the battery box further includes a reinforcement member, and the front beam and the first support beam are both connected to the reinforcement member.

[0011] Optionally, the reinforcement member includes a first reinforcement plate and a second reinforcement plate connected to each other, the first reinforcement plate is connected to the front beam, and the second reinforcement plate is connected to the first support beam.

[0012] Optionally, the first reinforcing sheet is in contact with a surface of the front beam facing the first supporting beam, and the second reinforcing sheet is in contact with a surface of the first supporting beam facing away from the bottom plate.

[0013] Optionally, the battery box further includes a first expansion beam, two ends of which are respectively connected to the first side beam and the second side beam and separate a space in the installation cavity for accommodating the battery cell assembly.

[0014] Optionally, the battery box further includes a second support beam, and two ends of the second support beam are respectively connected to the front beam and the first expansion beam.

[0015] Optionally, the second support beam is arranged on the bottom plate.

[0016] Optionally, the first support beam is connected to the base plate through the second support beam.

[0017] A second object of the present invention is to provide a battery pack, the front surface of which has good anti-extrusion capability.

[0018] To achieve this purpose, the utility model adopts the following technical solutions:

[0019] The battery pack includes a battery cell assembly and the aforementioned battery box, and the battery cell assembly is installed in the installation cavity.

[0020] Optionally, the battery pack further includes a bus bar and a connecting wire, and the bus bar and / or the connecting wire are fixed on the first support beam.

[0021] Beneficial effects:

[0022] In the battery box provided by the utility model, a first support beam is obliquely arranged in the installation cavity, and the two ends of the first support beam are respectively fixedly connected to the front beam and the bottom plate. When the front beam is squeezed on the side away from the installation cavity, the first support beam can play a good supporting role for the front beam, thereby improving the anti-extrusion ability of the front beam, so that the front surface of the battery box body has good anti-extrusion ability, and the first support beam will not occupy too much space in the box body, and has little effect on the energy density of the battery pack.

[0023] The battery pack provided by the utility model adopts the above-mentioned battery box, and the first support beam plays a good supporting role on the front beam of the battery box body, so the front surface of the battery pack has a higher anti-extrusion ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a box provided by an embodiment of the utility model;

[0025] Figure 2 yes Figure 1 A partial enlarged view of the middle A;

[0026] Figure 3 It is an enlarged partial cross-sectional view of the first support beam provided in an embodiment of the utility model.

[0027] In the figure:

[0028] 110, front beam; 111, front main beam; 112, front side beam; 120, first side beam; 130, rear beam; 140, second side beam; 150, bottom plate; 200, first support beam; 210, mounting hole; 300, reinforcement; 310, first reinforcement sheet; 320, second reinforcement sheet; 410, first expansion beam; 420, second expansion beam; 500, second support beam; 610, first blind rivet; 620, second blind rivet. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0030] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0031] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0032] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0033] This embodiment provides a battery box, the front surface of which has good anti-extrusion capability and has little effect on the energy density of the battery pack.

[0034] Specifically, Figures 1 to 3 As shown, the battery box includes a box body, a first support beam 200 and a box cover (not shown in the figure), wherein the box body includes a front beam 110, a first side beam 120, a rear beam 130, a second side beam 140 and a bottom plate 150, the front beam 110, the first side beam 120, the rear beam 130 and the second side beam 140 are sequentially arranged end to end on the bottom plate 150 and enclosed to form an installation cavity, the first support beam 200 is located in the installation cavity and is inclined relative to the bottom plate 150, one end of the first support beam 200 is fixedly connected to the bottom plate 150 by welding or the like, and the other end is fixedly connected to the front beam 110 by welding or the like, and the box cover is sealed and buckled on the box body to form a sealed space in the installation cavity.

[0035] Based on the above design, the first support beam 200 is tiltedly arranged in the installation cavity, and the two ends of the first support beam 200 are fixedly connected to the front beam 110 and the bottom plate 150 respectively. When the side of the front beam 110 away from the installation cavity (i.e., the outer surface of the front beam 110) is squeezed, the first support beam 200 can play a good supporting role for the front beam 110, thereby improving the anti-extrusion ability of the front beam 110, so that the front surface of the battery box body has good anti-extrusion ability. In addition, the tilted first support beam 200 occupies less space and has less impact on the energy density of the battery pack.

[0036] Furthermore, the first support beam 200 is inclined at an angle of 30°-45° relative to the bottom plate 150. The first support beam 200 at this inclination angle can provide a better support effect for the front beam 110. Optionally, the number of the first support beams 200 is at least two, and at least two first support beams 200 are arranged at intervals along the extension direction of the front beam 110 to further improve the anti-extrusion ability of the front beam 110. In this embodiment, Figures 1 to 3As shown, the front beam 110 includes a front main beam 111 and two front side beams 112, wherein one of the front side beams 112 is connected to the front main beam 111 and the first side beam 120, respectively, and the other front side beam 112 is connected to the front main beam 111 and the second side beam 140, respectively. Each front side beam 112 corresponds to a first support beam 200, and the two ends of the first support beam 200 are connected to the front side beam 112 and the bottom plate 150, respectively, so that the two front side beams 112 have a high anti-extrusion ability. Of course, in other embodiments, each front side beam 112 may correspond to more than two first support beams 200, or the front main beam 111 and the two front side beams 112 may correspond to one or more first support beams 200; or, when the two ends of the front main beam 111 are directly connected to the first side beam 120 and the second side beam 140, more than two first front side beams 112 are arranged on the front main beam 111. The number and distribution of the first support beams 200 can be determined according to specific usage requirements and the specific structure of the box front beam 110, and will not be listed in detail here.

[0037] Alternatively, if Figures 1 to 3 As shown, the battery box also includes a reinforcement 300, and the front beam 110 and the first support beam 200 are both connected to the reinforcement 300. The provision of the reinforcement 300 improves the reliability of the connection between the first support beam 200 and the front beam 110, thereby providing a guarantee for improving the anti-extrusion ability of the front beam 110.

[0038] Furthermore, if Figures 1 to 3 As shown, the reinforcement member 300 includes a first reinforcement sheet 310 and a second reinforcement sheet 320 connected to each other, the first reinforcement sheet 310 is connected to the front beam 110, and the second reinforcement sheet 320 is connected to the first support beam 200. This structural design makes it easier to connect the reinforcement member 300 to the front beam 110 and the first support beam 200. Of course, in other embodiments, the reinforcement member 300 can also be a structure such as a reinforcement rib diagonally supported between the front beam 110 and the first support beam 200.

[0039] Preferably, if Figures 1 to 3 As shown, the first reinforcing sheet 310 is in contact with the surface of the front beam 110 facing the first support beam 200, and the second reinforcing sheet 320 is in contact with the surface of the first support beam 200 facing away from the bottom plate 150. On the one hand, this structural design can save the space occupied by the reinforcing member 300 in the installation cavity, and on the other hand, it can improve the connection strength between the first reinforcing sheet 310 and the front beam 110 and the connection strength between the second reinforcing sheet 320 and the first support beam 200, thereby further improving the reliability of the connection between the front beam 110 and the first support beam 200.

[0040] Optionally, the first reinforcing sheet 310 is fixedly connected to the second reinforcing sheet 320 to further improve the connection reliability between the front beam 110 and the first support beam 200. Of course, in other embodiments, the first reinforcing sheet 310 and the second reinforcing sheet 320 can also be rotatably connected to adapt to the first support beam 200 with different inclination angles.

[0041] Optionally, the first reinforcing sheet 310 is riveted to the front beam 110 by the first blind rivet 610 to reduce the difficulty of connecting the first reinforcing sheet 310 to the front beam 110. Of course, the first reinforcing sheet 310 and the front beam 110 can also be connected by welding or the like. The second reinforcing sheet 320 is riveted to the first support beam 200 by the second blind rivet 620 to reduce the difficulty of connecting the second reinforcing sheet 320 to the first support beam 200. Of course, the second reinforcing sheet 320 and the first support beam 200 can also be connected by welding or the like.

[0042] Optionally, the first reinforcement sheet 310 and the second reinforcement sheet 320 are both high-strength steel sheets to further improve the anti-extrusion capability of the front beam 110 .

[0043] Alternatively, if Figures 1 to 3 As shown, the battery box also includes a first expansion beam 410 and a second expansion beam 420, and both ends of the first expansion beam 410 are respectively connected to the first side beam 120 and the second side beam 140, and both ends of the second expansion beam 420 are respectively connected to the first side beam 120 and the second side beam 140, and the battery cell assembly can be installed between the first expansion beam 410 and the second expansion beam 420 (that is, the side of the first expansion beam 410 away from the front beam 110). When the battery cell assembly expands during the charging and discharging process, the battery cell assembly squeezes the first expansion beam 410 and the second expansion beam 420, so that the first expansion beam 410 and the second expansion beam 420 are deformed to absorb the expansion of the battery cell assembly, so that the shape of the battery box body will not change with the expansion of the battery cell assembly, and can also provide a squeezing force to the battery cell assembly.

[0044] It should be noted that, in other embodiments, the second expansion beam 420 can be omitted, and the battery cell assembly can be arranged between the first expansion beam 410 and the rear beam 130 (that is, the side of the first expansion beam 410 away from the front beam 110). When the battery cell assembly expands during the charging and discharging process, the battery cell assembly squeezes the first expansion beam 410 and the rear beam 130, so that the first expansion beam 410 is deformed to absorb the expansion of the battery cell assembly. Similarly, the shape of the battery box will not change with the expansion of the battery cell assembly, and the battery cell assembly can also be provided with a squeezing force.

[0045] Furthermore, if Figures 1 to 3As shown, the battery box also includes a second support beam 500, and both ends of the second support beam 500 are respectively connected to the front beam 110 and the first expansion beam 410. The setting of the second support beam 500 supports the first expansion beam 410, thereby improving the anti-expansion ability of the first expansion beam 410.

[0046] Furthermore, if Figures 1 to 3 As shown, the second support beam 500 is disposed on the bottom plate 150 to improve the support capacity of the second support beam 500 , thereby improving the anti-expansion capacity of the first expansion beam 410 .

[0047] Preferably, if Figures 1 to 3 As shown, the first support beam 200 is connected to the bottom plate 150 through the second support beam 500. On the one hand, the first support beam 200 can strengthen the strength of the second support beam 500 to a certain extent, so as to improve the supporting capacity of the second support beam 500. On the other hand, compared with the connection between the first support beam 200 and the first expansion beam 410, the solution provided in this embodiment reduces the channel for the expansion force of the battery cell assembly to be transmitted to the front beam 110. In particular, when the expansion amount of the battery cell assembly is large, the expansion force of the battery cell assembly can only be transmitted to the front beam 110 through the first expansion beam 410 and the second support beam 500, but cannot be transmitted to the front beam 110 through the first support beam 200, thereby reducing the probability of sealing failure between the box body and the box cover buckled on the box body; in addition, when the outer surface of the front beam 110 is squeezed, the squeezing force cannot be transmitted to the battery cell assembly through the first support beam 200, thereby reducing the probability of damage to the battery cell assembly.

[0048] Optionally, the first support beam 200 is made by an aluminum extrusion process, which is a relatively conventional production process in the art and is conducive to reducing production costs.

[0049] This embodiment also provides a battery pack, including a battery cell assembly and the aforementioned battery box. By applying the aforementioned battery box, the front surface of the battery pack has good anti-extrusion ability, which can improve the safety of the battery pack.

[0050] Specifically, the battery cell assembly is installed in the installation cavity. When the front surface of the battery pack (i.e., the side of the front beam 110 facing away from the installation cavity) is squeezed, the first support beam 200 can provide good support for the front beam 110, so that the front beam 110 (i.e., the front surface of the battery pack) has good anti-extrusion ability, thereby preventing the battery cell assembly from being squeezed or impacted, and making the battery pack have higher safety.

[0051] Optionally, the battery pack also includes a bus, a detection element (such as a temperature sensor or a voltage sensor, etc.), connecting wires and a battery management system (BMS). The multiple cells in the battery cell assembly are electrically connected through the bus. The detection element is arranged on the bus or on the battery cell to detect the real-time status of the battery cell, such as the temperature or voltage. The connecting wires are respectively connected to the detection element and the BMS to transmit the data signal detected by the detection element to the BMS, thereby realizing real-time monitoring of the battery cell assembly.

[0052] Furthermore, the busbar and / or connecting wires are fixed on the first support beam 200, eliminating the need to provide a bracket for fixing the busbar and / or connecting wires in the installation cavity, thereby achieving the effect of reducing weight and cost.

[0053] Furthermore, if Figures 1 to 3 As shown, the first support beam 200 is provided with a mounting hole 210. When fixing the busbar on the first support beam 200, a fixing member such as a pin or a bolt can be passed through the busbar, and the fixing member can be fixed in the mounting hole 210. When fixing the connecting wire on the first support beam 200, a fixing member such as a pin or a bolt can be fixed in the mounting hole 210, and the connecting wire can be fixed to the fixing member by winding or bonding.

[0054] Optionally, the busbar may be made of a material having conductive properties such as copper.

[0055] It should be noted that the battery box and battery pack provided in this embodiment are suitable for the traditional battery pack structure (that is, the battery cell assembly is clamped between two end plates to form a battery module, and multiple battery modules are installed in the same battery box body) and are also suitable for an integrated battery structure (CTP structure) in which the battery cell assembly is directly arranged in the battery box body.

[0056] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A battery box, characterized in that: include: A box body, the box body comprising a front beam (110), a first side beam (120), a rear beam (130), a second side beam (140) and a bottom plate (150), wherein the front beam (110), the first side beam (120), the rear beam (130) and the second side beam (140) are sequentially arranged end to end on the bottom plate (150) and enclose a mounting cavity; A first support beam (200), the first support beam (200) is located in the installation cavity and is tilted relative to the base plate (150), one end of the first support beam (200) is fixedly connected to the base plate (150), and the other end of the first support beam (200) is fixedly connected to the front beam (110).

2. The battery box according to claim 1, characterized in that: The battery box further comprises a reinforcing member (300), and the front beam (110) and the first supporting beam (200) are both connected to the reinforcing member (300).

3. The battery box according to claim 2, characterized in that: The reinforcement member (300) comprises a first reinforcement sheet (310) and a second reinforcement sheet (320) connected to each other, wherein the first reinforcement sheet (310) is connected to the front beam (110), and the second reinforcement sheet (320) is connected to the first support beam (200).

4. The battery box according to claim 3, characterized in that: The first reinforcing sheet (310) is in contact with the surface of the front beam (110) facing the first supporting beam (200), and the second reinforcing sheet (320) is in contact with the surface of the first supporting beam (200) facing away from the bottom plate (150).

5. The battery box according to any one of claims 1 to 4, characterized in that: The battery box also includes a first expansion beam (410), the two ends of which are respectively connected to the first side beam (120) and the second side beam (140) and separate a space in the installation cavity for accommodating a battery cell assembly.

6. The battery box according to claim 5, characterized in that: The battery box further comprises a second support beam (500), and two ends of the second support beam (500) are respectively connected to the front beam (110) and the first expansion beam (410).

7. The battery box according to claim 6, characterized in that: The second supporting beam (500) is arranged on the bottom plate (150).

8. The battery box according to claim 6, characterized in that: The first support beam (200) is connected to the bottom plate (150) via the second support beam (500).

9. A battery pack, characterized in that: It comprises a battery cell assembly and a battery box as described in any one of claims 1 to 8, and the battery cell assembly is installed in the installation cavity.

10. The battery pack according to claim 9, characterized in that: The battery pack further comprises a bus bar and a connecting wire, and the bus bar and / or the connecting wire are fixed on the first supporting beam (200).

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