Novel power battery pack

Abstract

The utility model belongs to the technical field of batteries, and discloses a novel power battery pack which comprises a box body assembly and at least one group of power supply assembly, the box body assembly comprises a lower box body provided with a containing groove, and the at least one group of power supply assembly is arranged in the containing groove. Each power supply assembly comprises a fixed end plate, a bridging conduction piece and two rows of multiple battery modules which are sequentially arranged in the first direction, the fixed end plates are connected into the containing grooves, and the two sides, in the second direction, of the multiple battery modules in the same row are connected through the same fixed end plate; and the bridging conduction piece is used for realizing current conduction of two adjacent battery modules along the first direction. The multiple battery modules in the same row are connected into a whole through the fixing end plates, meanwhile, the expansion limiting effect is achieved, a limiting structure does not need to be additionally arranged, the space is saved, the battery modules are expanded through the saved space, and therefore the space utilization rate is increased, and the energy density is increased.

Description

Technical Field

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

[0002] At present, new energy vehicles have attracted more and more social attention. The cost of electric vehicles is a problem widely concerned by each vehicle factory, battery factory and consumers. As a component with a relatively high cost proportion in electric vehicles, the reduction of the cost of the battery pack plays an extremely important role. Therefore, the market's requirements for the energy density of the battery pack and the space utilization rate inside the battery pack are getting higher and higher.

[0003] Since the batteries in the battery pack will expand after long-term cyclic use, in order to avoid excessive expansion of the batteries in the battery pack, a separate limiting structure is usually provided in the battery pack to suppress the expansion amplitude. For example, cross beams and foam are provided in the battery pack.

[0004] However, due to the need to reserve space for the limiting structure inside the battery pack with this structure, the space inside the battery pack is occupied, resulting in poor space utilization rate, and the size of the battery module is limited, resulting in a low energy density of the battery pack. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a new type of power battery pack with good space utilization rate and high energy density.

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

[0007] A new type of power battery pack is provided, and the new type of power battery pack includes:

[0008] A box body assembly, the box body assembly includes a lower box body, and a receiving groove is opened on the lower box body;

[0009] At least one set of power supply components, the power supply components are arranged in the receiving groove, each power supply component includes a fixed end plate, a cross-connecting conduction piece and two rows of a plurality of battery modules arranged in sequence along a first direction. The fixed end plate is connected to the inside of the receiving groove, and the plurality of battery modules in the same row are connected on both sides along a second direction through the same fixed end plate respectively. The cross-connecting conduction piece is used to realize the current conduction between two adjacent battery modules along the first direction.

[0010] Optionally, each power supply component further includes a battery management unit and a sampling unit. The sampling unit is arranged on the battery module and is electrically connected to the battery management unit. The sampling unit is used to collect information of the battery module. The battery management unit is arranged between two adjacent battery modules along the second direction and is connected to the fixed end plate.

[0011] Optionally, each of the power supply components further includes a right-angle connector, and the right-angle connector is used to connect the sampling unit and the battery management unit connected to the fixed end plate.

[0012] Optionally, each of the power supply components further includes a high-voltage power-off unit, which is disposed between two adjacent battery modules along the second direction and connected to the battery management unit.

[0013] Optionally, the box assembly further comprises a plurality of fixed beams, the plurality of fixed beams are spaced apart in the accommodating groove, and the fixed end plate is detachably connected to the plurality of fixed beams.

[0014] Optionally, the box assembly also includes a connecting piece, a connecting threaded hole is opened on the fixed beam, a connecting through hole is opened on the fixed end plate, one end of the connecting piece is pressed against the side of the fixed end plate away from the fixed beam, and the other end of the connecting piece passes through the connecting through hole and is threadedly connected to the connecting threaded hole.

[0015] Optionally, a side of the fixed end plate facing the fixed beam is further provided with a limiting notch corresponding to the fixed beam one by one, and the fixed beam is located in the limiting notch.

[0016] Optionally, connecting bosses for connecting with the fixing beam are extended on both sides of the fixed end plate along the first direction, and the limiting notch is provided on one side of the connecting boss facing the fixing beam.

[0017] Optionally, the power supply assembly further includes a thermal insulation pad, and the thermal insulation pad is arranged on a side of the fixed end plate facing the battery module.

[0018] Optionally, the box assembly further includes a cooling plate, which is disposed at the bottom of the accommodating groove and is used to cool the battery module.

[0019] Beneficial effects of the utility model:

[0020] The utility model provides a novel power battery pack, which connects multiple battery modules in the same row along both sides of the second direction through the same fixed end plate, and connects the fixed end plate in the accommodating groove, so that the fixed end plate connects the multiple battery modules in the same row into a whole and plays a role in limiting expansion. There is no need to set an additional limiting structure in the lower box body, which saves space. The battery module can be expanded by utilizing the saved space, thereby improving space utilization and increasing energy density. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is the structural breakdown diagram of the new power battery pack provided by the present utility model;

[0022] Figure 2 It is the assembly diagram of the new power battery pack provided by the present utility model;

[0023] Figure 3 It is Figure 2 the enlarged structural diagram of part A in

[0024] In the figure:

[0025] 1. Box body assembly; 11. Lower box body; 111. Accommodating groove; 12. Fixed beam; 13. Connecting piece;

[0026] 2. Power supply assembly; 21. Fixed end plate; 211. Limiting notch; 212. Connecting boss; 22. Cross-connecting conduction piece; 23. Battery module; 24. Battery management unit; 25. Sampling unit; 26. Right-angle connector; 27. High-voltage power-off unit. Specific implementation manner

[0027] The present utility model will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model are shown in the drawings, rather than all the structures.

[0028] In the description of the present utility model, unless otherwise clearly defined 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 integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the connection inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0029] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is at a lower horizontal height than the second feature.

[0030] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0031] Currently, new energy vehicles are attracting more and more social attention. The cost of electric vehicles is a widely concerned issue for each vehicle manufacturer, battery manufacturer and consumer. As a component with a relatively high proportion of the cost of electric vehicles, reducing the cost of the battery pack plays an extremely important role. Therefore, the market's requirements for the energy density of the battery pack and the space utilization rate inside the battery pack are gradually increasing.

[0032] Since the batteries in the battery pack will expand after long-term cyclic use, in order to avoid excessive expansion of the batteries in the battery pack, a separate limiting structure is usually provided in the battery pack to suppress the expansion amplitude. For example, crossbeams and foam are provided in the battery pack.

[0033] However, due to the need to reserve space for the limiting structure inside the battery pack with this structure, the space inside the battery pack is occupied, resulting in poor space utilization rate, and the size of the battery module is limited, resulting in a low energy density of the battery pack.

[0034] Therefore, in order to improve the space utilization rate and further increase the energy density of the battery pack, this embodiment provides a new type of power battery pack.

[0035] As Figures 1 to 3 shown, the new type of power battery pack includes a box body assembly 1 and at least one power supply assembly 2. The box body assembly 1 includes a lower box body 11. A receiving groove 111 is formed on the lower box body 11. The power supply assembly 2 is arranged in the receiving groove 111. Each power supply assembly 2 includes a fixed end plate 21, a cross-connecting conductor 22 and multiple battery modules 23 arranged in two rows in sequence along a first direction. The fixed end plate 21 is connected inside the receiving groove 111. The two sides of the multiple battery modules 23 in the same row along a second direction are respectively connected by the same fixed end plate 21. The cross-connecting conductor 22 is used to realize the current conduction between two adjacent battery modules 23 along the first direction.

[0036] By connecting multiple battery modules 23 in the same row on both sides of the second direction through the same fixed end plate 21, and connecting the fixed end plate 21 in the accommodating groove 111, the fixed end plate 21 connects the multiple battery modules 23 in the same row into a whole and plays a role in limiting expansion. There is no need to set up an additional limiting structure in the lower box 11, which saves space. By utilizing the saved space to expand the battery module 23, space utilization is improved and energy density is increased.

[0037] The number of power supply components 2 can be set according to demand. In the present embodiment, a group of power supply components 2 is arranged in the lower box 11 of the new power battery pack, and the number of battery modules 23 in each row of the power supply components 2 can also be set according to demand. In the present embodiment, two battery modules 23 are arranged in each row. Therefore, a total of four battery modules 23 are arranged in the lower box 11 of the present embodiment, and are arranged in the accommodating groove 111 of the lower box 11 in the form of two rows and two columns, wherein the two battery modules 23 in the same row are connected on both sides along the second direction by the same fixed end plate 21.

[0038] Alternatively, if Figure 1 , Figure 3 As shown, each power supply component 2 further includes a battery management unit 24 and a sampling unit 25. The sampling unit 25 is disposed on the battery module 23 and is electrically connected to the battery management unit 24. The sampling unit 25 is used to collect information of the battery module 23. The battery management unit 24 is disposed between two battery modules 23 adjacent to each other along the second direction and is connected to the fixed end plate 21. By disposing the battery management unit 24 between two battery modules 23 adjacent to each other along the second direction and connecting the battery management unit 24 to the fixed end plate 21 connected to the battery module 23, the distance between the sampling unit 25 and the battery management unit 24 is shortened, thereby shortening the length of the wiring harness and saving wiring usage.

[0039] Furthermore, if Figure 1 , Figure 3 As shown, each power supply assembly 2 further includes a right-angle connector 26, which is used to connect the sampling unit 25 and the battery management unit 24 connected to the fixed end plate 21. Since the sampling unit 25 is arranged on the side of the battery module 23 away from the lower box 11, and the battery management unit 24 is connected to the fixed end plate 21, the sampling unit 25 and the battery management unit 24 are not in the same plane, so the right-angle connector 26 is used to facilitate the connection between the sampling unit 25 and the battery management unit 24.

[0040] Alternatively, if Figure 1 , Figure 3As shown, each power supply assembly 2 further includes a high-voltage power-off unit 27, which is disposed between two battery modules 23 adjacent to each other along the second direction and connected to the battery management unit 24. By providing the high-voltage power-off unit 27, the connection with the external circuit can be disconnected when necessary to protect safety, and both the high-voltage power-off unit 27 and the battery management unit 24 are disposed between two battery modules 23 adjacent to each other along the second direction, so that the distance between the high-voltage power-off unit 27 and the battery management unit 24 is shortened, thereby shortening the length of the wiring harness, saving wiring usage, and making the structure of the novel power battery pack more compact.

[0041] Alternatively, if Figure 1 As shown, the box assembly 1 also includes a plurality of fixed beams 12, and the plurality of fixed beams 12 are arranged at intervals in the receiving groove 111, and the fixed end plate 21 is detachably connected to the plurality of fixed beams 12. By arranging a plurality of fixed beams 12 arranged at intervals in the receiving groove 111, it is convenient to connect the fixed end plate 21 with the lower box 11. In this embodiment, since the four battery modules 23 in the lower box 11 are arranged in two rows and two columns, in this embodiment, three fixed beams 12 arranged at intervals along the first direction are provided, which are respectively connected to the middle of the fixed end plate 21 and the two sides along the first direction.

[0042] Alternatively, if Figure 1 As shown, the box assembly 1 also includes a connector 13, a connecting threaded hole is provided on the fixed beam 12, a connecting through hole is provided on the fixed end plate 21, one end of the connector 13 is pressed against the side of the fixed end plate 21 away from the fixed beam 12, and the other end of the connector 13 passes through the connecting through hole and is threadedly connected to the connecting threaded hole. By using the connector 13 to achieve a detachable connection between the fixed beam 12 and the fixed end plate 21, on the one hand, the welding process can be avoided, and disassembly and assembly can be facilitated. On the other hand, the number of single cells constituting the battery module 23 can be adjusted without changing the structure of the lower box 11 to adapt to different power requirements. In this embodiment, the connector 13 is a bolt.

[0043] Alternatively, if Figure 1 As shown, a limiting notch 211 corresponding to the fixed beam 12 is further provided on the side of the fixed end plate 21 facing the fixed beam 12, and the fixed beam 12 is located in the limiting notch 211. By providing the limiting notches 211 corresponding to the fixed beam 12 on the fixed end plate 21, on the one hand, it is convenient to position the fixed end plate 21 and the fixed beam 12 when they are assembled, and on the other hand, it plays a limiting role, ensuring that the relative position of the fixed end plate 21 and the fixed beam 12 will not be dislocated, thereby facilitating subsequent connection.

[0044] Alternatively, if Figure 1As shown, on both sides of the fixed end plate 21 extending along the first direction, there are connecting bosses 212 for connecting with the fixed beam 12. On the side of the connecting boss 212 facing the fixed beam 12, there is a limiting notch 211. By extending the connecting bosses 212 for connecting with the fixed beam 12 on both sides of the fixed end plate 21 along the first direction, the size of the fixed end plate 21 exceeding the battery module 23 is reduced, the material used for the fixed end plate 21 is reduced, and the manufacturing cost is lowered.

[0045] Optionally, the power supply assembly 2 further includes a heat insulation pad (not shown in the figure), and the heat insulation pad is arranged on the side of the fixed end plate 21 facing the battery module 23. By arranging the heat insulation pad on the side of the fixed end plate 21 facing the battery module 23, on the one hand, heat insulation is achieved, and on the other hand, a buffer area can be formed between the fixed end plate 21 and the battery module 23 through the heat insulation pad, avoiding hard contact between the battery module 23 and the fixed end plate 21 after expansion and causing damage to the battery module 23.

[0046] Optionally, the box body assembly 1 further includes a cooling plate (not shown in the figure), and the cooling plate is arranged at the bottom of the accommodating groove 111. The cooling plate is used to cool the battery module 23. By placing the cooling plate at the bottom of the accommodating groove 111, the cooling of the battery module 23 is achieved through the cooling plate, avoiding the temperature of the battery module 23 from being too high.

[0047] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A new power battery pack, characterized in that: The novel power battery pack comprises: A box assembly, the box assembly comprising a lower box, and a receiving groove is provided on the lower box; At least one group of power supply components, the power supply components are arranged in the accommodating groove, each of the power supply components includes a fixed end plate, a jumper conductive piece and two rows of multiple battery modules arranged in sequence along a first direction, the fixed end plate is connected to the accommodating groove, and the multiple battery modules in the same row are connected on both sides along the second direction respectively through the same fixed end plate, and the jumper conductive piece is used to realize current conduction between two adjacent battery modules along the first direction.

2. The new power battery pack according to claim 1 is characterized in that: Each of the power supply components also includes a battery management unit and a sampling unit. The sampling unit is arranged on the battery module and is electrically connected to the battery management unit. The sampling unit is used to collect information of the battery module. The battery management unit is arranged between two adjacent battery modules along the second direction and is connected to the fixed end plate.

3. The new power battery pack according to claim 2 is characterized in that: Each of the power supply components further includes a right-angle connector, which is used to connect the sampling unit and the battery management unit connected to the fixed end plate.

4. The new power battery pack according to claim 2 is characterized in that: Each of the power supply components further includes a high-voltage power-off unit, which is disposed between two adjacent battery modules along the second direction and connected to the battery management unit.

5. The novel power battery pack according to claim 1 is characterized in that: The box assembly further comprises a plurality of fixed beams, wherein the plurality of fixed beams are arranged in the accommodating groove at intervals, and the fixed end plate is detachably connected to the plurality of fixed beams.

6. The novel power battery pack according to claim 5 is characterized in that: The box assembly also includes a connecting piece, a connecting threaded hole is opened on the fixed beam, a connecting through hole is opened on the fixed end plate, one end of the connecting piece is pressed against the side of the fixed end plate away from the fixed beam, and the other end of the connecting piece passes through the connecting through hole and is threadedly connected to the connecting threaded hole.

7. The new power battery pack according to claim 5, characterized in that: A side of the fixed end plate facing the fixed beam is further provided with a limiting notch corresponding to the fixed beam one by one, and the fixed beam is located in the limiting notch.

8. The novel power battery pack according to claim 7 is characterized in that: The fixed end plate has connecting bosses extending from both sides along the first direction for connecting with the fixing beam, and the connecting boss is provided with the limiting notch on one side facing the fixing beam.

9. The novel power battery pack according to claim 1, characterized in that: The power supply assembly also includes a thermal insulation pad, which is arranged on a side of the fixed end plate facing the battery module.

10. The novel power battery pack according to claim 1, characterized in that: The box assembly also includes a cooling plate, which is arranged at the bottom of the accommodating groove and is used to cool the battery module.

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