Battery module and battery pack

Abstract

The utility model belongs to the technical field of power batteries, and discloses a battery module and a battery pack. The battery module comprises at least one battery unit, a locking supporting plate and a first connecting piece, each battery unit comprises a shell, a top cover plate and at least one battery cell, an opening is formed in at least one end of the shell, the top cover plate covers the opening in a sealing mode, the at least one battery cell is contained in the shell, a via hole is formed in the top cover plate, and the via hole is used for leading out a tab on the battery cell; the first connecting piece is used for connecting the top cover plate and the locking support plate, and the locking support plate is used for being connected with the inner side wall of the battery box body. Through the arrangement, the supporting force of the battery unit in the vertical direction comprises the supporting force provided by the bottom plate of the battery box body, the supporting force provided by the inner side wall of the battery box body and the clamping force provided by the locking supporting plate, so that the requirement on the strength of the bottom plate of the battery box body is reduced, and the condition that the bottom plate of the battery box body becomes thick and heavy is avoided; therefore, the service life and the performance of the battery module are guaranteed.

Description

Technical Field

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

[0002] With the rapid development of the new energy vehicle industry, the requirements for the energy density, safety and manufacturing cost of power batteries are increasing day by day. Therefore, in the prior art, there appears a way to omit the module link in the traditional battery pack and directly integrate the battery cells into the battery pack, that is, the cell-to-pack (CTP) technology, thereby effectively improving the volume utilization rate and energy density of the battery pack.

[0003] However, this method will basically concentrate the weight of the battery cells on the bottom plate of the battery pack, so the strength requirement for the bottom plate of the battery pack is relatively high, increasing the weight and thickness of the bottom plate of the battery pack, resulting in an overall increase in the weight of the battery pack structure and affecting the cruising range of the vehicle. In addition, when the liquid cooling plate is integrated on the bottom plate of the battery pack, the weight of the battery cells will be directly concentrated on the liquid cooling plate, which also increases the weight and thickness of the liquid cooling plate, resulting in poor heat conduction effect of the liquid cooling plate, shortened service life of the battery pack and decreased battery performance.

[0004] Based on the above, there is an urgent need for a battery module and a battery pack to solve the problems existing in the prior art. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a battery module and a battery pack, which are used to solve the technical problem that the weight of the existing battery cells is directly concentrated on the bottom plate of the battery pack, so as to prevent the bottom plate of the battery pack from becoming thick and heavy, and further improve the service life and performance of the battery pack.

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

[0007] The battery module includes at least one battery unit, a locking support plate and a first connecting member. The battery unit includes a housing, a top cover plate and at least one battery cell. At least one end of the housing has an opening, and the opening is hermetically covered with the top cover plate. At least one battery cell is accommodated in the housing, and a through hole is formed in the top cover plate for leading out the tab of the battery cell. The first connecting member is used to connect the top cover plate and the locking support plate, and the locking support plate is used to connect with the inner side wall of the battery box.

[0008] Preferably, the first connecting member is a threaded connecting member. A first threaded hole is formed in the top cover plate, and a first through hole is provided on the locking support plate. The first connecting member passes through the first through hole and is threadedly connected to the first threaded hole.

[0009] Preferably, the battery module further includes an adhesive member and a plurality of the battery cells, and adjacent battery cells are fixedly connected through the adhesive member.

[0010] Preferably, the adhesive member includes a heat insulation layer and an adhesive layer, and one adhesive layer is provided on each of the two sides of the heat insulation layer, and the adhesive layer is adhesively connected to the battery cell.

[0011] Preferably, the heat insulation layer is a foam or a heat insulation pad.

[0012] A battery pack includes a battery box body, a second connecting member, and the above-mentioned battery module. The battery module is accommodated in the battery box body, and the second connecting member is used for fixedly connecting the locking support plate of the battery module and the battery box body.

[0013] Preferably, a support beam is convexly provided on the inner side wall of the battery box body; the locking support plate includes a support plate body and a support ear, the support ear is convexly provided on the support plate body, the support plate body is fixedly connected to the top cover plate of the battery module through the first connecting member of the battery module, the support ear is lapped on the support beam, and the support ear is fixedly connected to the support beam through the second connecting member.

[0014] Preferably, the second connecting member is a threaded connecting member. A second through hole is formed in the support ear along a first direction, and a second threaded hole is formed in the support beam. The second connecting member passes through the second through hole and is threadedly connected to the second threaded hole.

[0015] Preferably, the support ear has a hollow structure.

[0016] Preferably, the support plate body includes a base plate and a flanging portion. The support ear is provided on the surface of the base plate. The flanging portion is located at the edge of the base plate, and the flanging portion is connected to the top cover plate of the battery module through the first connecting member of the battery module. The flanging portion and the base plate jointly enclose an avoidance area for avoiding the pole ear on the battery cell.

[0017] Advantages of the battery module provided by the present utility model: Through the cooperation of the first connecting member and the locking support plate with the top cover plate of the battery cell, the weight pressure exerted by the battery cell on the bottom plate of the battery box can be transferred to the inner side wall of the battery box. The force transmission path of the battery cell in the battery box is converted to: battery module - bottom plate and top cover plate of the battery box - first connecting member - locking support plate - inner side wall of the battery box. That is to say, the supporting force of the battery cell in the vertical direction includes the supporting force provided by the bottom plate of the battery box, the supporting force provided by the inner side wall of the battery box, and the clamping force provided by the locking support plate. Thus, it is not necessary for the bottom plate of the battery box to bear excessive pressure, the strength requirement for the bottom plate of the battery box is reduced, and the situation where the bottom plate of the battery box becomes thick and heavy is avoided.

[0018] Advantages of the battery pack provided by the present utility model: Since the above-mentioned battery module is provided in the battery pack, in this battery pack, the bottom plate of the battery box reduces the bearing capacity of the battery module, thereby reducing the requirements for the thickness and weight of the bottom plate of the battery box, avoiding an increase in the thickness and weight of the bottom plate of the battery box, and effectively improving the battery life and safety performance of this battery pack. Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of the battery module provided by the embodiment of the present utility model;

[0020] Figure 2 is an exploded schematic structural diagram of the battery module provided by the embodiment of the present utility model;

[0021] Figure 3 is a partial structural sectional view of the battery cell provided by the embodiment of the present utility model;

[0022] Figure 4 is Figure 3 a partial enlarged view at A in

[0023] Figure 5 is a schematic structural diagram of the top cover plate provided by the embodiment of the present utility model;

[0024] Figure 6 is a schematic internal structural diagram of the battery pack provided by the embodiment of the present utility model;

[0025] Figure 7 is a partial structural sectional view of the battery pack provided by the embodiment of the present utility model;

[0026] Figure 8 is a schematic structural diagram of the locking support plate provided by the embodiment of the present utility model.

[0027] 100, Battery box body; 110, Support beam; 1101, Second threaded hole; 200, Second connecting member;

[0028] 1, Battery cell; 11, Outer shell; 12, Top cover plate; 121, Through hole; 122, First threaded hole; 13, Battery core; 131, Tab;

[0029] 2, Locking support plate; 201, First through hole; 21, Support plate body; 211, Substrate; 212, Flanging portion; 213, Avoidance area; 22, Support ear; 221, Second through hole;

[0030] 3, First connecting member;

[0031] 4, Middle flexible acquisition circuit board;

[0032] 5, Edge flexible acquisition circuit board. Detailed implementation manner

[0033] 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 sake of description, only parts related to the present utility model are shown in the drawings, rather than all the structures.

[0034] 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 internal communication of two components or the interaction relationship between two components. 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.

[0035] 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 "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below", and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature is at a lower horizontal height than the second feature.

[0036] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", "left", etc. are based on the orientation or positional relationships shown in the drawings, and are 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, and thus cannot be construed as a limitation on the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0037] The following will introduce the battery module and battery pack provided by the present utility model in conjunction with the drawings and specific embodiments. The battery pack further includes a battery box body, and the above-mentioned battery module is fixedly arranged in the battery box body, and the present utility model does not limit the number of battery modules arranged in the battery box body.

[0038] Embodiment 1

[0039] As Figures 1 to 8 shown, it is the battery module provided by this embodiment. The battery module includes at least one battery cell 1, a locking support plate 2, and a first connecting member 3. Among them, the battery cell 1 includes a housing 11, a top cover plate 12, and at least one battery core 13. At least one end of the housing 11 is provided with an opening, and the opening is sealed by the top cover plate 12. At least one battery core 13 is hermetically accommodated in the housing 11, and a through hole 121 is formed in the top cover plate 12. The through hole 121 is used to lead out the tab 131 on the battery core 13. The first connecting member 3 is used to connect the top cover plate 12 and the locking support plate 2, and the locking support plate 2 is used to connect with the inner side wall of the battery box body 100.

[0040] Preferably, in this embodiment, along the third direction, openings are provided at both ends of the housing 11, and each opening is sealed by a top cover plate 12, so that the two tabs 131 of the battery cell 1 (one is a positive tab group and the other is a negative tab group) can be respectively led out through a through hole 121.

[0041] It should be noted that in the drawings of the present application, the double-headed arrow marked with X represents the first direction, the double-headed arrow marked with Y represents the second direction, and the double-headed arrow marked with Z represents the third direction. In this embodiment, the first direction corresponds to the height direction of the battery core 13; the second direction corresponds to the thickness direction of the battery core 13. For a square battery core, the directions corresponding to its two main surfaces are the thickness direction; the third direction corresponds to the length direction of the battery core 13. In this embodiment, the first direction, the second direction, and the third direction are perpendicular to each other in pairs.

[0042] Through the cooperative arrangement of the above-mentioned first connecting member 3, the locking support plate 2 and the top cover plate 12 of the battery unit 1, the weight pressure exerted by the battery unit 1 on the bottom plate of the battery box 100 can be transferred to the inner side wall of the battery box 100. In this way, the force transmission path of the battery unit 1 in the battery box 100 is: battery module - bottom plate of the battery box 100, top cover plate 12 - first connecting member 3 - locking support plate 2 - inner side wall of the battery box 100. That is to say, the supporting force of the battery unit 1 in the vertical direction includes the supporting force provided by the bottom plate of the battery box 100, the supporting force provided by the inner side wall of the battery box 100, and the clamping force provided by the locking support plate 2. Thus, it is not necessary for the bottom plate of the battery box 100 to bear excessive pressure, the strength requirement for the bottom plate of the battery box 100 is reduced, and the situation where the bottom plate of the battery box 100 becomes thick and heavy is avoided.

[0043] Furthermore, in this embodiment, a liquid cooling channel is provided inside the bottom plate of the battery box 100, so that the bottom plate of the battery box 100 is also integrated with the function of heat exchange for the battery unit 1. Since the strength requirement for the bottom plate of the battery box 100 is reduced and the bottom plate of the battery box 100 does not need to be designed thick and heavy, the heat conduction effect of the bottom plate of the battery box 100 can be ensured, thereby guaranteeing the service life and good performance of the battery pack using this battery module.

[0044] Optionally, in this embodiment, along the second direction, the battery module includes a plurality of battery units 1 arranged in a stacked manner. In this embodiment, the battery unit 1 is a soft-pack square-shell battery. In addition, the locking support plate 2 extends along Figure 2 the second direction in []. This enables the locking support plate 2 to be fixedly connected to the top cover plates 12 of multiple battery units 1 at the same end. In this way, the locking support plate 2 directly integrates and fixes multiple battery units 1 into a battery module, thereby eliminating traditional module structural components such as steel belts and side plates. This allows the battery module to be installed in the box in a CTP (cell-to-pack) manner, thereby improving the integration and energy density of the entire battery pack structure and reducing production costs.

[0045] Furthermore, in this embodiment, the battery module further includes an adhesive member (not shown in the figure). Adjacent battery units 1 are fixedly connected through the adhesive member to enhance the connection strength between adjacent battery units 1 through the adhesive member, thereby making the structure of the entire battery module more stable.

[0046] Specifically, the bonding member includes a heat insulation layer and an adhesive layer. An adhesive layer is provided on each side of the heat insulation layer. In this way, not only can the connection stability between two adjacent battery cells 1 be ensured, but also the heat insulation effect of the battery module can be improved. When one of the battery cells 1 undergoes thermal runaway, the heat insulation layer can effectively block the heat transfer to the adjacent battery cell 1, thereby avoiding the expansion of the thermal runaway problem and greatly improving the safety performance of the entire battery module. Optionally, the heat insulation layer is a foam or a heat insulation pad. Both the foam and the heat insulation pad have excellent heat insulation performance, and are relatively light, easy to install, and cost-effective. The heat insulation layer can be made of any one of epoxy resin glue, silicone glue, polyurethane glue, etc. The present utility model does not limit this.

[0047] Optionally, in this embodiment, in combination with Figure 4 , Figure 5 as shown, the first connecting member 3 is a threaded connecting member. A first threaded hole 122 is formed in the top cover plate 12, and a first through hole 201 is formed in the locking support plate 2. The first connecting member 3 passes through the first through hole 201 so that the locking support plate 2 and the top cover plate 12 are fixedly connected by a threaded connection. This connection method not only has a reliable connection effect, but also can effectively simplify the connection difficulty between the locking support plate 2 and the top cover plate 12, and reduce the process difficulty.

[0048] Optionally, in this embodiment, with reference to Figure 2 as shown, the battery module further includes a side flexible acquisition circuit board 5. Along the third direction, the side flexible acquisition circuit board 5 is located at the end position of the battery cell 1 and is connected to the tab 131 led out by the battery cell 1, and can detect and collect the temperature at the edge of the battery cell 1 to monitor the working temperature of the tab 131 to ensure safety.

[0049] Optionally, in this embodiment, the battery module further includes a middle flexible acquisition circuit board 4. Along the third direction, the middle flexible acquisition circuit board 4 is located at the middle position of the battery cell 1, so that the actual temperature of the area with a higher temperature of the battery cell 1 can be detected in real time. In this way, through the cooperation of the middle flexible acquisition circuit board 4 and the side flexible acquisition circuit board 5, the use safety of the battery cell 1 can be protected in all directions.

[0050] Embodiment Two

[0051] In combination with Figures 6 to 8As shown in the figure, the objective of this embodiment is to provide a battery pack, which includes a battery box body 100, a second connecting member 200, and the above-mentioned battery module. The battery module is accommodated in the battery box body 100, and the second connecting member 200 is used to fixedly connect the battery module and the battery box body 100. Since the above-mentioned battery module is provided in the battery pack, in this battery pack, the bottom plate of the battery box body 100 reduces the bearing capacity of the battery module, thereby reducing the requirements for the thickness and weight of the bottom plate of the battery box body 100, so that the thickness and weight of the bottom plate of the battery box body 100 are avoided from increasing, thereby effectively improving the endurance and safety performance of this battery pack.

[0052] Further, referring to Figure 6 , Figure 7 As shown in the figure, in this embodiment, the inner side wall of the battery box body 100 is convexly provided with support beams 110. The support beams 110 can improve the overall stiffness and strength of the battery box body 100. At least two support beams 110 are provided, and the two support beams 110 are spaced along the second direction, and a space for accommodating the battery module is defined between the two support beams 110. In addition, as Figure 8 shown, the locking support plate 2 includes a support plate body 21 and support lugs 22. The support lugs 22 protrude from the support plate body 21. The support plate body 21 is fixedly connected to the top cover plate 12 of the battery module through the first connecting member 3 of the battery module. The support lugs 22 are lapped on the support beams 110, and the support lugs 22 are fixedly connected to the support beams 110 through the second connecting member 200. Through the above settings, the supporting effect of the inner side wall of the battery box body 100 on the battery unit 1 can be fully exerted, and it is convenient to fixedly connect the locking support plate 2 and the inner side wall of the battery box body 100.

[0053] Furthermore, in this embodiment, the second connecting member 200 also selects a threaded connecting member. A second through hole 221 is penetrated along the first direction on the support lug 22, and a second threaded hole 1101 is opened on the support beam 110. The second threaded connecting member penetrates through the second through hole 221 and is threadedly connected into the second threaded hole 1101. In this way, the locking support plate 2 and the support beam 110 are fixed by means of threaded connection. On the one hand, the connection strength between the locking support plate 2 and the support beam 110 is strengthened, and the shaking of the locking support plate 2 is avoided. On the other hand, the locking support plate 2 can be disassembled from the battery unit 1 and the support beam 110 for separate maintenance and replacement, which is beneficial to reducing the maintenance cost.

[0054] Optionally, in this embodiment, the support lug 22 has a hollow structure, so that the support lug 22 helps to reduce the structural weight of the entire locking support plate 2, thereby helping to reduce the structural weight of the entire battery pack, and also being able to reduce the production and use cost of the locking support plate 2.

[0055] More specifically, the pallet body 21 provided in this embodiment further includes a substrate 211 and a flanging portion 212. The surface of the substrate 211 is provided with lugs 22. Flanging portions 212 are provided at both opposite edges of the substrate 211, so that the cross-sectional shape of the pallet body 21 is in a "ji" shape. The flanging portion 212 is connected to the top cover plate 12 of the battery module through the first connecting member 3 of the battery module, and the flanging portion 212 and the substrate 211 can jointly enclose an avoidance area 213. Combining Figure 3 and Figure 8 As shown, the avoidance area 213 can avoid the edge flexible acquisition circuit board 5 and the ear 131 led out from the via hole 121, so as to prevent the locking pallet 2 from squeezing the ear 131 and the edge flexible acquisition circuit board 5, ensuring the use safety of both, and effectively extending the service life of the battery unit 1.

[0056] In the description of this specification, the descriptions referring to terms such as "some embodiments", "other embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0057] Obviously, the above embodiments of the present invention are merely examples given to clearly illustrate the present invention, rather than limitations on 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. Battery module, characterized in that, Comprising at least one battery cell (1), a locking plate (2) and a first connecting member (3), the battery cell (1) includes a housing (11), a top cover plate (12) and at least one battery core (13), at least one end of the housing (11) has an opening, the opening is sealed with the top cover plate (12), at least one battery core (13) is accommodated in the housing (11), and a through hole (121) is formed in the top cover plate (12), and the through hole (121) is used to lead out the tab (131) on the battery core (13), the first connecting member (3) is used to connect the top cover plate (12) and the locking plate (2), and the locking plate (2) is used to connect with the inner side wall of the battery box (100).

2. The battery module according to claim 1, wherein The first connecting member (3) is a threaded connecting member, a first threaded hole (122) is formed in the top cover plate (12), a first through hole (201) is provided on the locking plate (2), the first connecting member (3) passes through the first through hole (201) and is threadedly connected to the first threaded hole (122).

3. The battery module according to claim 1, characterized in that, The battery module further includes an adhesive member and a plurality of battery cells (1), and adjacent battery cells (1) are fixedly connected through the adhesive member.

4. The battery module according to claim 3, characterized in that, The adhesive member includes a heat insulation layer and an adhesive layer, and an adhesive layer is provided on each side of the heat insulation layer, and the adhesive layer is adhesively connected to the battery cell (1).

5. The battery module according to claim 4, characterized in that, The heat insulation layer is a foam or a heat insulation pad.

6. Battery pack, characterized in that, Including a battery box (100), a second connecting member (200) and the battery module according to any one of claims 1-5, the battery module is accommodated in the battery box (100), and the second connecting member (200) is used to fixedly connect the locking plate (2) of the battery module and the battery box (100).

7. The battery pack according to claim 6, characterized in that, A support beam (110) protrudes from the inner side wall of the battery box (100), the locking plate (2) includes a plate body (21) and a support ear (22), the support ear (22) protrudes from the plate body (21), the plate body (21) is fixedly connected to the top cover plate (12) of the battery module through the first connecting member (3) of the battery module, the support ear (22) overlaps on the support beam (110), and the support ear (22) is fixedly connected to the support beam (110) through the second connecting member (200).

8. The battery pack according to claim 7, characterized in that, The second connecting member (200) is a threaded connecting member, a second through hole (221) is formed in the support ear (22) along a first direction, a second threaded hole (1101) is formed in the support beam (110), the second connecting member (200) passes through the second through hole (221) and is threadedly connected to the second threaded hole (1101).

9. The battery pack according to claim 7, characterized in that, The support ear (22) has a hollow structure.

10. The battery pack according to claim 7, wherein The pallet body (21) includes a base plate (211) and a flanging portion (212). The surface of the base plate (211) is provided with the lugs (22). The flanging portion (212) is located at the edge of the base plate (211), and the flanging portion (212) is connected to the top cover plate (12) of the battery module through the first connecting member (3) of the battery module. The flanging portion (212) and the base plate (211) jointly enclose an avoidance area (213), and the avoidance area (213) is used to avoid the tabs (131) on the battery cells (13).

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