Battery pack connecting structure and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery pack connecting structure and a battery pack, the battery pack connecting structure comprises a fixed end plate, a bracket and a fixed part, a first mounting hole is formed in the fixed end plate along a first direction, the fixed end plate is fixed with a battery module of the battery pack along two opposite ends of a second direction, and the second direction is perpendicular to the first direction; one end of the support abuts against the fixed end plate and is provided with a second installation hole corresponding to the first installation hole in the first direction. The fixing piece penetrates through the first mounting hole and the second mounting hole to connect the fixing end plate and the bracket, and one surface, deviating from the fixing end plate, of the bracket is suitable for being fixedly connected with a shell of the battery pack. The battery module of the battery pack is fixedly connected through the fixing end plate, the fixing end plate and the support are fixed through the fixing piece, the support is further fixed with the shell of the battery pack, and the structural strength and stability of the whole battery pack are improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery pack connection structure and a battery pack. Background Technology

[0002] The emergence of new energy vehicles has greatly improved environmental pollution control. However, new energy vehicles suffer from insufficient range. Due to the limited internal space of the battery pack, it is crucial to maximize its capacity by utilizing this limited space. Therefore, a more compact cell arrangement is needed to improve the space utilization of the battery pack, thereby increasing its capacity.

[0003] Most existing battery packs use a single-layer module. This structure results in a large gap in the vertical direction, leading to low space utilization and difficulty in effectively increasing battery pack capacity. To address this, related technologies employ a double-layer module structure to improve space utilization. However, the double-layer module shifts the center of gravity upwards, resulting in decreased structural strength and poor stability. Utility Model Content

[0004] In view of this, the present invention provides a battery pack connection structure and a battery pack to solve the problems of poor structural strength and poor stability of existing battery packs that use a double-layer module structure.

[0005] In a first aspect, this utility model provides a battery pack connection structure, comprising:

[0006] A fixed end plate is provided with a through first mounting hole along a first direction. The two opposite ends of the fixed end plate along a second direction are respectively fixed to the battery module of the battery pack. The second direction is perpendicular to the first direction.

[0007] The bracket has one end abutting against the fixed end plate and has a second mounting hole along the first direction corresponding to the first mounting hole;

[0008] A fastener passes through the first mounting hole and the second mounting hole to connect the fixed end plate and the bracket, wherein the side of the bracket facing away from the fixed end plate is adapted to be fixedly connected to the housing of the battery pack.

[0009] Beneficial effects: The battery pack connection structure of this utility model fixes the battery module of the battery pack through a fixed end plate, and fixes the fixed end plate to the bracket through a fastener. The bracket is also fixed to the shell of the battery pack, forming a stable structure in which multiple structural components are fixed to each other, thereby improving the structural strength and stability of the entire battery pack.

[0010] In one optional embodiment, the fixed end plate has a protrusion along a first direction, the first mounting hole is provided on the protrusion, the side of the protrusion near the bracket forms a mounting groove, and one end of the bracket abuts against the bottom of the mounting groove.

[0011] Beneficial effects: The fixed end plate is provided with a protrusion, and the protrusion has a mounting groove to fix the bracket. On the one hand, it can save the installation space of the bracket. On the other hand, one end of the bracket abuts against the bottom of the mounting groove to form a surface contact. The bracket can support the fixed end plate, improve the connection stability between the two, and avoid misalignment and displacement of the fixed end plate.

[0012] In one alternative embodiment, a gap is left between the wall of the mounting groove and the bracket along the second direction.

[0013] Beneficial effect: The groove wall of the mounting slot has an installation gap between itself and the bracket in the second direction, which can ensure that the fixed end plate does not interfere with the bracket after it is fixed to the battery module.

[0014] In one alternative embodiment, the fastener extends along the second direction and has a limiting portion, and the side of the protrusion facing away from the bracket abuts against the limiting portion.

[0015] Beneficial effects: By abutting against the protrusion, the installation position of the fastener can be restricted, further improving the overall structural stability and connection strength.

[0016] In one optional embodiment, the fixed end plate is provided with a first end face and a second end face at opposite ends along the second direction, the first end face and the second end face also extend along the second direction to form a first abutting portion, the bracket extends along the second direction to form a second abutting portion, and the first abutting portion abuts against the second abutting portion.

[0017] Beneficial effects: The fixed end plate is further positioned relative to the bracket by abutting with the second abutting part on the bracket, and the fixed end plate is supported by the bracket. The structure is simple and has good structural stability.

[0018] In one alternative embodiment, the fixed end plate and / or the bracket are provided with at least one cavity.

[0019] Beneficial effects: By providing at least one cavity on the fixed end plate and / or bracket, the overall weight of the battery pack connection structure can be reduced, facilitating installation and transportation.

[0020] Secondly, this utility model also provides a battery pack, comprising:

[0021] The housing has a receiving cavity, and a crossbeam is provided inside the receiving cavity. The crossbeam extends along a second direction and divides the receiving cavity into a first sub-cavity and a second sub-cavity.

[0022] A first battery module is disposed in the first sub-cavity, and the first battery module is provided with a first sub-module and a second sub-module at intervals along the second direction.

[0023] The second battery module is disposed in the second sub-cavity, and the second battery module is provided with a third sub-module and a fourth sub-module at intervals along the second direction;

[0024] The two battery pack connection structures described above are connected as follows: the first sub-module and the second sub-module are connected by a fixed end plate of one of the battery pack connection structures; the third sub-module and the fourth sub-module are fixedly connected by a fixed end plate of another battery pack connection structure; and the brackets of the two battery pack connection structures are respectively fixedly connected to the housing.

[0025] Beneficial Effects: The battery pack of this utility model adopts a double-layer module structure with the first and second battery modules arranged vertically, which can fully utilize the vertical space within the battery pack, improve the space utilization rate of the battery pack, and thus obtain a larger battery capacity to meet usage requirements. Furthermore, the first and second sub-modules of the first battery module are fixedly connected by a fixed end plate of a battery pack connecting structure, and the third and fourth sub-modules of the second battery module are fixedly connected by a fixed end plate of another battery pack connecting structure. The brackets of the two battery pack connecting structures are also fixedly connected to the shell, giving the battery pack a stable overall structure. The relative independence of the first and second battery modules also reduces design complexity and improves reliability.

[0026] In one optional embodiment, the housing is further provided with a first cold plate and a second cold plate. The first cold plate is disposed between the first battery module and the crossbeam. The bracket of one of the battery pack connection structures is fixedly connected to the first cold plate. The second cold plate is disposed between the second battery module and the housing. The bracket of the other battery pack connection structure is fixedly connected to the second cold plate.

[0027] Beneficial effects: The first cold plate is used to cool the first battery module, and the second cold plate is used to cool the second battery module. By fixing the brackets of the two battery pack connection structures to the first and second cold plates respectively, the two battery modules can be further secured using the battery pack's own fixing structure, eliminating the need for additional fixing structures and reducing operating costs.

[0028] In one alternative embodiment, the two battery pack connection structures, the first cold plate, and the crossbeam are fixedly connected by one of the fasteners passing sequentially through one of the battery pack connection structures, the first cold plate, the crossbeam, and the other battery pack connection structure.

[0029] Beneficial effects: By using a single fastener to simultaneously fix two battery pack connection structures, the first cold plate, and the crossbeam, and with one of the battery pack connection structures also fixedly connected to the second cold plate, the first battery module and the second battery module are fixed as a whole, further improving the overall structural strength and stability of the battery pack.

[0030] In one alternative embodiment, the fixed end plate of the battery pack connection structure connecting the third sub-module and the fourth sub-module extends toward the first cold plate to form an extension portion, the extension portion abutting against the first cold plate.

[0031] Beneficial effects: The fixed end plate located on the lower layer has an extension that abuts against the first cold plate. The first cold plate further limits the movement of the fixed end plate located on the lower layer, which can prevent the fixed end plate located on the lower layer from shaking, thereby further improving the overall stability of the battery pack. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of a battery pack according to an embodiment of the present utility model;

[0034] Figure 2 This is a schematic diagram of another battery pack according to an embodiment of the present invention;

[0035] Figure 3 This is a top view of the fixed end plate of the battery pack connection structure according to an embodiment of the present utility model.

[0036] Figure 4 This is a side view of another fixed end plate according to an embodiment of the present utility model.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Fixed end plate; 101. First end face; 102. Second end face; 103. Protrusion; 104. Mounting groove; 105. First abutment part; 106. Extension part; 107. First mounting hole; 2. Bracket; 201. Second abutment part; 3. Fixing component; 301. Limiting part; 4. Housing; 5. Crossbeam; 6. First battery module; 601. First sub-module; 602. Second sub-module; 7. Second battery module; 701. Third sub-module; 702. Fourth sub-module; 8. First cold plate; 9. Second cold plate. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0040] The following is combined Figures 1 to 4 The following describes embodiments of the present invention.

[0041] According to an embodiment of this utility model, a battery pack connection structure is provided, mainly comprising: a fixed end plate 1, a bracket 2, and a fixing member 3. The fixed end plate 1 has a through first mounting hole 107 along a first direction, and its two ends along a second direction are respectively fixed to the battery modules of the battery pack. The second direction is perpendicular to the first direction. One end of the bracket 2 abuts against the fixed end plate 1 and has a second mounting hole along the first direction corresponding to the first mounting hole 107. The fixing member 3 passes through the first mounting hole 107 and the second mounting hole to connect the fixed end plate 1 and the bracket 2. The side of the bracket 2 facing away from the fixed end plate 1 is adapted to be fixedly connected to the housing 4 of the battery pack.

[0042] As can be seen, the battery pack connection structure provided in this embodiment of the present invention fixes the battery module of the battery pack to the fixed end plate 1, and fixes the fixed end plate 1 to the bracket 2 by the fixing member 3. The bracket 2 is also fixed to the shell 4 of the battery pack, forming a stable structure in which multiple structural members are fixed to each other, thereby improving the structural strength and stability of the entire battery pack.

[0043] Specifically, the first direction is the up-down direction, such as... Figure 1 As shown by arrow A in the diagram, the second direction is the left-right direction, as... Figure 1 As shown by arrow B in the diagram.

[0044] In one embodiment, such as Figure 1 , Figure 2 and Figure 3As shown, the fixed end plate 1 has a protrusion 103 along the first direction, and a first mounting hole 107 is provided on the protrusion 103. A mounting groove 104 is formed on the side of the protrusion 103 near the bracket 2, and one end of the bracket 2 abuts against the bottom of the mounting groove 104. The fixed end plate 1 has a protrusion 103, and the protrusion 103 has a mounting groove 104 to fix the bracket 2. This saves installation space for the bracket 2, and the contact between one end of the bracket 2 and the bottom of the mounting groove 104 forms a surface contact, allowing the bracket 2 to support the fixed end plate 1, improving the connection stability between the two and preventing misalignment and displacement of the fixed end plate 1.

[0045] In one embodiment, such as Figure 1 and Figure 2 As shown, along the second direction, there is a gap between the wall of the mounting groove 104 and the bracket 2. The installation gap between the wall of the mounting groove 104 and the bracket 2 in the second direction ensures that the fixed end plate 1 does not interfere with the bracket 2 after it is fixed to the battery module.

[0046] In one embodiment, such as Figure 1 and Figure 2 As shown, the fastener 3 extends along the second direction and is provided with a limiting part 301, and the side of the protrusion 103 facing away from the bracket 2 abuts against the limiting part 301. By the limiting part 301 abutting against the protrusion 103, the installation position of the fastener 3 can be restricted, further improving the overall structural stability and connection strength.

[0047] Specifically, the upper surface of the protrusion 103 is flat, and the bottom of the limiting part 301 abuts against the upper surface of the protrusion 103. The lower surface of the protrusion 103 is also flat, and the top of the bracket 2 abuts against the lower surface of the protrusion 103.

[0048] It should be noted that the fastener 3 can be a conventional fastener such as a bolt or screw. For example, the fastener 3 is a capped bolt, the first mounting hole 107 and the second mounting hole are threaded holes, and the limiting part 301 is the cap of the capped bolt.

[0049] It should be noted that this utility model does not limit the number of fasteners 3; one, two, or more can be selected as needed. The number of the first mounting hole 107 and the second mounting hole corresponds to the number of fasteners 3. For example, as... Figure 3 As shown, the protrusion 103 is provided with two first mounting holes 107 at intervals. Two fasteners 3 pass through the first mounting holes 107 and the second mounting holes respectively to achieve a fixed connection between the fixed end plate 1 and the bracket 2, thereby further improving the connection stability.

[0050] In one embodiment, such as Figure 1 and Figure 2As shown, the fixed end plate 1 has a first end face 101 and a second end face 102 at opposite ends along the second direction. The first end face 101 and the second end face 102 also extend along the second direction to form a first abutting portion 105, and the bracket 2 extends along the second direction to form a second abutting portion 201. The first abutting portion 105 abuts against the second abutting portion 201. The fixed end plate 1 and the bracket 2 are positioned by the abutting of the first abutting portion 105 of the fixed end plate 1 against the second abutting portion 201 on the bracket 2, and the fixed end plate 1 is supported by the bracket 2. The structure is simple and has good structural stability.

[0051] In one embodiment, the fixed end plate 1 and / or the bracket 2 are provided with at least one cavity. By providing at least one cavity on the fixed end plate 1 and / or the bracket 2, the overall weight of the battery pack connection structure can be reduced, facilitating installation and transportation.

[0052] According to an embodiment of the present invention, another aspect provides a battery pack, mainly comprising: a housing 4, a first battery module 6, a second battery module 7, and a connection structure between the two battery packs. The housing 4 has a receiving cavity, within which a crossbeam 5 extends along a second direction and divides the receiving cavity into a first sub-cavity and a second sub-cavity. The first battery module 6 is disposed in the first sub-cavity, and a first sub-module 601 and a second sub-module 602 are spaced apart along the second direction. The second battery module 7 is disposed in the second sub-cavity, and a third sub-module 701 and a fourth sub-module 702 are spaced apart along the second direction. The first sub-module 601 and the second sub-module 602 are connected by a fixed end plate 1 of one battery pack connection structure, and the third sub-module 701 and the fourth sub-module 702 are fixedly connected by a fixed end plate 1 of another battery pack connection structure. The brackets 2 of the two battery pack connection structures are respectively fixedly connected to the housing 4.

[0053] The battery pack provided in this embodiment of the invention adopts a double-layer module structure with the first battery module 6 and the second battery module 7 arranged vertically. This structure can fully utilize the vertical space within the battery pack, improving its space utilization rate and thus achieving a larger battery capacity to meet usage requirements. Furthermore, the first sub-module 601 and the second sub-module 602 of the first battery module 6 are fixedly connected by a fixed end plate 1 of a battery pack connecting structure, and the third sub-module 701 and the fourth sub-module 702 of the second battery module 7 are fixedly connected by another fixed end plate 1 of a battery pack connecting structure. The brackets 2 of the two battery pack connecting structures are also fixedly connected to the housing 4, resulting in a stable overall structure for the battery pack. The relative independence of the first battery module 6 and the second battery module 7 also reduces design complexity and improves reliability.

[0054] Specifically, the first battery module 6 is located on the upper layer, and the first sub-module 601 and the second sub-module 602 are arranged along the second direction. The second battery module 7 is located on the lower layer, and the third sub-module 701 and the fourth sub-module 702 are arranged along the second direction.

[0055] It should be noted that this utility model embodiment does not limit the fixed connection structure between the fixed end plate 1 and the first battery module 6 and the second battery module 7, and any existing fixed connection method can be selected as needed.

[0056] For example, a first groove is formed between the first end face 101 of the fixed end plate 1 and the protrusion 103. A steel cable tie passes through the first groove and clamps and fixes the first sub-module 601 to the first end face 101. Similarly, a second groove is formed between the second end face 102 of the fixed end plate 1 and the protrusion 103. Another steel cable tie passes through the second groove and clamps and fixes the second sub-module 602 to the second end face 102. The fixing methods of the third sub-module 701 and the fourth sub-module 702 are similar and will not be repeated here.

[0057] In one embodiment, such as Figure 1 and Figure 2 As shown, the housing 4 is also provided with a first cold plate 8 and a second cold plate 9. The first cold plate 8 is located in the first sub-cavity and between the first battery module 6 and the crossbeam 5. One of the battery pack connection structure brackets 2 is fixedly connected to the first cold plate 8. The second cold plate 9 is located in the second sub-cavity and between the second battery module 7 and the housing 4. The other battery pack connection structure bracket 2 is fixedly connected to the second cold plate 9.

[0058] The first cold plate 8 is used to cool the first battery module 6, and the second cold plate 9 is used to cool the second battery module 7. The bracket 2 connecting the two battery packs is fixedly connected to the first cold plate 8 and the second cold plate 9 respectively. This allows the battery packs to further secure the two battery modules using their own fixing structure, eliminating the need for additional fixing structures and reducing operating costs. Furthermore, the first cold plate 8 and the second cold plate 9 are in direct contact with the battery cells on the first battery module 6 and the second battery module 7, resulting in better heat dissipation.

[0059] It should be noted that the present invention does not limit the fixed connection form between the bracket 2 and the first cold plate 8 and the second cold plate 9. Any existing fixed connection form can be selected as needed. For example, the two brackets 2 can be fixed to the first cold plate 8 and the second cold plate 9 respectively by bolts, or the two brackets 2 can be welded to the first cold plate 8 and the second cold plate 9 respectively.

[0060] In one embodiment, such as Figure 2As shown, a fastener 3 passes sequentially through one battery pack connection structure, the first cold plate 8, the crossbeam 5, and another battery pack connection structure, thus fixing the two battery pack connection structures, the first cold plate 8, and the crossbeam 5 together. By using a single fastener 3 to simultaneously fix the two battery pack connection structures, the first cold plate 8, and the crossbeam 5, and with one of the battery pack connection structures also fixedly connected to the second cold plate 9, the first battery module 6 and the second battery module 7 are fixed as a whole, further improving the overall structural strength and stability of the battery pack.

[0061] Specifically, mounting holes are also provided on the crossbeam 5 and the first cold plate 8 respectively. The fastener 3 passes through the upper fixed end plate 1 and bracket 2, the first cold plate 8, the crossbeam 5, the lower fixed end plate 1 and bracket 2 in sequence from top to bottom. The lower bracket 2 is then fixed to the second cold plate 9 to achieve a fixed connection between the upper and lower battery modules.

[0062] Additionally, a fixing structure corresponding to the fixing member 3 can be provided on the second mounting hole of the lower bracket 2. For example, the fixing member 3 is a bolt, and a rivet nut or wire thread sleeve is provided on the second mounting hole of the lower bracket 2 to fix it to the bolt. In this case, the mounting holes on the first mounting hole 107, the crossbeam 5, and the first cold plate 8 can be round holes.

[0063] Furthermore, in one embodiment, such as Figure 2 and Figure 4 As shown, the fixed end plate 1 of the battery pack connection structure connecting the third sub-module 701 and the fourth sub-module 702 extends toward the first cold plate 8 to form an extension 106, which abuts against the first cold plate 8. The extension 106 abuts against the first cold plate 8 on the lower fixed end plate 1, and the extension 106 abuts against the first cold plate 8. The first cold plate 8 further limits the movement of the lower fixed end plate 1, which can prevent it from shaking, thereby further improving the overall stability of the battery pack.

[0064] Specifically, the fixed end plate 1 of the battery pack connection structure connecting the third sub-module 701 and the fourth sub-module 702 is the fixed end plate 1 located on the lower layer. At this time, the fastener 3 passes directly through the fixed end plate 1 located on the lower layer and does not need to abut against the fixed end plate 1 on the lower layer. The fixed end plate 1 on the lower layer is fixed by the extension 106.

[0065] Although embodiments of the present 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 present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery pack connection structure, characterized in that, include: A fixed end plate is provided with a through first mounting hole along a first direction. The two opposite ends of the fixed end plate along a second direction are respectively fixed to the battery module of the battery pack. The second direction is perpendicular to the first direction. The bracket has one end abutting against the fixed end plate and has a second mounting hole along the first direction corresponding to the first mounting hole; A fastener passes through the first mounting hole and the second mounting hole to connect the fixed end plate and the bracket, wherein the side of the bracket facing away from the fixed end plate is adapted to be fixedly connected to the housing of the battery pack.

2. The battery pack connection structure according to claim 1, characterized in that, The fixed end plate has a protrusion along the first direction, the first mounting hole is provided on the protrusion, the side of the protrusion near the bracket is recessed to form a mounting groove, and one end of the bracket abuts against the bottom of the mounting groove.

3. The battery pack connection structure according to claim 2, characterized in that, Along the second direction, a gap is left between the wall of the mounting groove and the bracket.

4. The battery pack connection structure according to claim 2, characterized in that, The fastener extends along the second direction and has a limiting portion, and the side of the protrusion facing away from the bracket abuts against the limiting portion.

5. The battery pack connection structure according to any one of claims 1 to 4, characterized in that, The fixed end plate is provided with a first end face and a second end face at opposite ends along the second direction. The first end face and the second end face also extend along the second direction to form a first abutting portion. The bracket extends along the second direction to form a second abutting portion. The first abutting portion abuts against the second abutting portion.

6. The battery pack connection structure according to any one of claims 1 to 4, characterized in that, The fixed end plate and / or the bracket are provided with at least one cavity.

7. A battery pack, characterized in that, include: The housing has a receiving cavity, and a crossbeam is provided inside the receiving cavity. The crossbeam extends along a second direction and divides the receiving cavity into a first sub-cavity and a second sub-cavity. A first battery module is disposed in the first sub-cavity, and the first battery module is provided with a first sub-module and a second sub-module at intervals along the second direction. The second battery module is disposed in the second sub-cavity, and the second battery module is provided with a third sub-module and a fourth sub-module at intervals along the second direction; The battery pack connection structure according to any one of claims 1 to 6, wherein the first sub-module and the second sub-module are connected by a fixed end plate of one of the battery pack connection structures, the third sub-module and the fourth sub-module are fixedly connected by a fixed end plate of another battery pack connection structure, and the brackets of the two battery pack connection structures are respectively fixedly connected to the housing.

8. The battery pack according to claim 7, characterized in that, The housing is also provided with a first cold plate and a second cold plate. The first cold plate is disposed between the first battery module and the crossbeam. The bracket of one of the battery pack connection structures is fixedly connected to the first cold plate. The second cold plate is disposed between the second battery module and the housing. The bracket of the other battery pack connection structure is fixedly connected to the second cold plate.

9. The battery pack according to claim 8, characterized in that, The two battery pack connection structures, the first cold plate, and the crossbeam are fixedly connected by passing one of the fixed members sequentially through one of the battery pack connection structures, the first cold plate, the crossbeam, and the other battery pack connection structure.

10. The battery pack according to claim 9, characterized in that, The fixed end plate of the battery pack connection structure connecting the third sub-module and the fourth sub-module extends toward the first cold plate to form an extension portion, and the extension portion abuts against the first cold plate.

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