Battery pack, power battery system and vehicle

Abstract

The utility model belongs to the technical field of power batteries, and particularly relates to a battery pack, a power battery system and a vehicle. The utility model aims to solve the problem of poor bearing capacity of the upper cover in the battery pack. The utility model discloses a battery pack, a power battery system and a vehicle. The battery pack comprises an upper cover, a battery cell module and a plurality of supporting pieces, the supporting piece is an insulator and is connected to one side, facing the upper cover, of the battery cell module; a plurality of reinforcing ribs are arranged on one side, facing the battery cell module, of the upper cover, correspond to the supporting pieces and are propped against the supporting pieces. The supporting piece is supported between the battery cell module and the upper cover to form a rigid supporting structure of the upper cover, the supporting piece and the battery cell module, so that the bottom of the upper cover is effectively supported, the bearing capacity of the upper cover is improved, and the upper cover is not prone to concave deformation after being stressed.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of power battery technology, and in particular to a battery pack, a power battery system and a vehicle. Background Art

[0002] As the core power supply component of electric vehicles, the battery pack determines key indicators such as the electric vehicle's driving range, cost, service life, safety, and maintainability.

[0003] In the related art, a battery pack usually includes an upper cover, a battery cell module, a bus and an insulating support material. The bus is located on the side of the battery cell module facing the upper cover. The bus is connected in series with the battery cell poles in the battery cell module by welding. The bus is spaced apart from the upper cover, and insulating material, foam and other flexible support materials are arranged between the bus and the upper cover. The insulating material can meet the insulation requirements between the bus and the upper cover, and the foam and other flexible support materials can improve the deformation resistance of the upper cover, making the upper cover not easily deformed.

[0004] However, flexible supporting materials such as foam have poor support, resulting in poor bearing capacity of the upper cover. Utility Model Content

[0005] In view of this, the main purpose of the embodiments of the present application is to provide a battery pack, a power battery system and a vehicle to solve the technical problem of poor load-bearing capacity of the upper cover in the battery pack.

[0006] To achieve the above-mentioned purpose, an embodiment of the present application provides a battery pack, including an upper cover, a battery cell module and a plurality of support members; the support member is an insulator, and the support member is connected to the side of the battery cell module facing the upper cover; the side of the upper cover facing the battery cell module is constructed with a plurality of reinforcing ribs, the reinforcing ribs correspond to the support member, and the reinforcing ribs abut against the support member.

[0007] In some embodiments that may include the above-mentioned embodiments, the battery cell module includes multiple battery cell groups, the battery cell group includes multiple battery cells, the multiple battery cells are arranged in sequence along a first horizontal direction, and the multiple battery cell groups are arranged in sequence along a second horizontal direction, and the second horizontal direction is perpendicular to the first horizontal direction; the support member is strip-shaped, and the extension direction of the support member is parallel to the first horizontal direction, and the multiple support members are arranged in sequence along the second horizontal direction at both ends of the battery cell group along the second horizontal direction; the reinforcement ribs are also strip-shaped, and the extension direction of the reinforcement ribs is parallel to the first horizontal direction.

[0008] In some embodiments that may include the above-mentioned embodiments, the plurality of support members include end support members and intermediate support members, the end support members are close to the two ends of the battery cell module along the second horizontal direction, and the intermediate support members are located between the two end support members; the end support members are connected to the shoulders of the battery cell groups at the two ends of the second horizontal direction; the intermediate support members are connected to the two adjacent battery cell groups, some of the intermediate support members are connected to one of the two adjacent battery cell groups, and some of the intermediate support members are connected to the other of the two adjacent battery cell groups.

[0009] In some embodiments that may include the above embodiments, a groove is configured on the top of the support member, the groove is filled with a first adhesive, and the support member and the upper cover are bonded by the first adhesive.

[0010] In some embodiments that may include the above embodiments, a second adhesive is provided between the bottom of the support member and the battery cell module, and the support member and the battery cell module are bonded to each other by the second adhesive.

[0011] In some embodiments that may include the above embodiments, an insulating film is provided on a side of the upper cover facing the battery cell module, and the insulating film covers the reinforcing ribs.

[0012] In some embodiments that may include the above embodiments, the battery cell includes two poles, the battery cell module also includes a plurality of bus bars, and the bus bars are welded to the poles; the battery pack also includes a heat conductor and an insulating member, the insulating member is connected to a side of the bus bar facing the upper cover, and the heat conductor is arranged between the insulating member and the upper cover.

[0013] In some embodiments that may include the above-mentioned embodiments, the insulating member is in the shape of a long plate, the extension direction of the insulating member is parallel to the first horizontal direction, and the insulating member is connected to the multiple bus bars arranged along the first horizontal direction; the heat conductive member includes a thermally conductive adhesive, and the insulating member and the upper cover are bonded by the thermally conductive adhesive.

[0014] An embodiment of the present application also provides a power battery system, comprising the battery pack described in any one of the above embodiments.

[0015] An embodiment of the present application also provides a vehicle, comprising the power battery system in the above embodiment.

[0016] The battery pack, power battery system and vehicle provided in the embodiments of the present application include a top cover, a battery cell module and a plurality of support members; the support member is an insulator, and the support member is connected to the side of the battery cell module facing the top cover; the side of the top cover facing the battery cell module is structured with a plurality of reinforcing ribs, and the reinforcing ribs correspond to the support member, and the reinforcing ribs abut against the support member. The support member is supported between the battery cell module and the top cover, forming a rigid support structure of the top cover-support member-battery cell module, so that the bottom of the top cover is effectively supported, thereby improving the bearing capacity of the top cover, and the top cover is not prone to concave deformation after being subjected to force. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A schematic diagram of the structure of a battery pack provided in an embodiment of the present application;

[0019] Figure 2 A partial exploded schematic diagram of a battery pack provided in an embodiment of the present application;

[0020] Figure 3 A schematic diagram of the structure of the upper cover of the battery pack provided in an embodiment of the present application;

[0021] Figure 4 A top view of a battery pack provided in an embodiment of the present application;

[0022] Figure 5 for Figure 4 Sectional view along AA direction;

[0023] Figure 6 for Figure 5 The enlarged schematic diagram of P1 in the middle;

[0024] Figure 7 A schematic diagram of the structure of the lower box and the battery cell module in the battery pack provided in an embodiment of the present application;

[0025] Figure 8 for Figure 7 The enlarged schematic diagram of P2 in the middle;

[0026] Fig. 9 for Figure 2 Enlarged schematic diagram of P3 in the figure.

[0027] Description of reference numerals:

[0028] 10. Upper cover;

[0029] 110, reinforcing ribs; 120, insulating film;

[0030] 20. Battery cell module;

[0031] 210, battery cell group; 211, battery cell;

[0032] 212, pole; 213, shoulder;

[0033] 220, bus;

[0034] 30. Supporting parts;

[0035] 310, end support member; 320, middle support member;

[0036] 301, groove;

[0037] 40. First bonding glue;

[0038] 50. Second bonding glue;

[0039] 60. Thermal conductive adhesive;

[0040] 70. Insulation parts;

[0041] 80. Lower box. DETAILED DESCRIPTION

[0042] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the present application and are not intended to limit the scope of protection of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0043] Secondly, it should be noted that in the description of the embodiments of the present application, terms such as "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present application.

[0044] In addition, it should be noted that in the description of the embodiments of the present application, unless otherwise clearly specified and limited, the terms "connected" and "connection" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0045] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0046] As described in the background technology, the battery pack in the related art has the problem of poor load-bearing capacity of the upper cover. The applicant has found through research that the reason for this problem is that the bottom of the upper cover is supported by flexible supporting materials such as foam, and lacks a rigid supporting structure, resulting in the problem of poor load-bearing capacity of the upper cover.

[0047] In response to the above technical problems, the embodiments of the present application provide a battery pack, a power battery system and a vehicle, by providing reinforcing ribs on the upper cover, and providing support members on the side of the battery cell module facing the upper cover, and the support members are in corresponding contact with the reinforcing ribs to form a rigid support structure of the upper cover-support member-battery cell, so that the bottom of the upper cover is effectively supported, thereby improving the bearing capacity of the upper cover, and the upper cover is not easy to be concave and deformed after being subjected to force.

[0048] The principles and features of the embodiments of the present application are described below in conjunction with the accompanying drawings. The examples given are only used to explain the embodiments of the present application and are not used to limit the scope of the embodiments of the present application.

[0049] refer to Figure 1 and Figure 2 The present embodiment provides a battery pack, including a lower box body 80, an upper cover 10, a battery cell module 20 and a plurality of support members 30. The lower box body 80 and the upper cover 10 are arranged to form a closed accommodating space, and the battery cell module 20 is arranged in the accommodating space.

[0050] The support member 30 is an insulator. The support member 30 is connected to a side of the battery cell module 20 facing the upper cover 10 . The support member 30 is a rigid member.

[0051] A plurality of reinforcing ribs 110 are formed on one side of the upper cover 10 facing the battery module 20 (see Figure 3 ), the reinforcing ribs 110 can improve the strength of the upper cover 10. Figure 4-Figure 6 The reinforcing rib 110 corresponds to the supporting member 30 , and the reinforcing rib 110 abuts against the supporting member 30 .

[0052] In the battery pack of this embodiment, the support member 30 is supported between the battery module 20 and the upper cover 10, forming a rigid support structure of the upper cover 10-support member 30-battery module 20, so that the bottom of the upper cover 10 is effectively supported. The upper cover 10 not only relies on its own strength to bear the load, but also can transfer the load downward and disperse it to the battery cell 211, so that the bearing capacity of the upper cover 10 is improved, and the upper cover 10 is not easy to be concave and deformed after being stressed. In a vehicle with CTB (cell to body) technology, when the battery pack upper cover 10 is combined with the vehicle body floor, the upper cover 10 can meet the bearing capacity requirements of the vehicle body floor.

[0053] refer to Figure 7 In some embodiments, the battery cell module 20 may include a plurality of battery cell groups 210, the battery cell group 210 includes a plurality of battery cells 211, the plurality of battery cells 211 are arranged in sequence along a first horizontal direction X, and the plurality of battery cell groups 210 are arranged in sequence along a second horizontal direction Y, and the second horizontal direction Y is perpendicular to the first horizontal direction X.

[0054] refer to Figure 8 The battery cell 211 includes two poles 212. The two poles 212 are located on the side of the battery cell 211 facing the upper cover 10, and the two poles 212 are arranged at intervals along the second horizontal direction Y on the side of the battery cell 211 facing the upper cover 10.

[0055] The battery module 20 may further include a plurality of bus bars 220, see Figure 6 The busbar 220 is disposed on a side of the battery cell 211 facing the upper cover 10 , and the busbar 220 is welded to the pole 212 .

[0056] In the second horizontal direction Y, the portion of the battery cell 211 on the side facing the upper cover 10, located outside the two poles 212, is the shoulder 213 of the battery cell 211 (refer to Figure 8 ). The shoulder 213 of each battery cell 211 in the battery cell group 210 constitutes the shoulder 213 of the battery cell group 210 .

[0057] refer to Figure 2 , Figure 8 and Fig. 9The support member 30 may be strip-shaped, or in other words, the support member 30 is a rectangular block, the extension direction (length direction) of the support member 30 may be parallel to the first horizontal direction X, and a plurality of support members 30 may be sequentially arranged along the second horizontal direction Y at both ends of the battery cell group 210 along the second horizontal direction Y, that is, the shoulder 213 of the battery cell group 210, so that the support member 30 may be prevented from occupying the portion of the battery cell group 210 located between the two poles 212. The portion of the battery cell group 210 located between the two poles 212 is usually provided with a sampling assembly or other structures, and the support member 30 is arranged on the shoulder 213 of the battery cell group 210 to avoid interference with the sampling assembly or other structures during assembly.

[0058] In the implementation mode in which the support member 30 is in the shape of a strip, the reinforcing rib 110 may also be in the shape of a strip, and the extension direction of the reinforcing rib 110 is parallel to the extension direction of the support member 30. The reinforcing rib 110 is connected to the corresponding support member 30, and the support member 30 supports the upper cover 10 through the reinforcing rib 110, thereby improving the bearing capacity of the upper cover 10.

[0059] refer to Fig. 9 In some embodiments, the plurality of supports 30 include end supports 310 and intermediate supports 320 .

[0060] There may be two end supports 310 , and the two end supports 310 may be respectively close to the two ends of the battery cell module 20 along the second horizontal direction Y. The end supports 310 are connected to the shoulders 213 of the battery cell group 210 at the two ends of the second horizontal direction Y.

[0061] The intermediate support member 320 is located between the two end support members 310. The intermediate support member 320 may be one or more. For example, a battery module 20 formed by two battery cell groups 210 corresponds to one intermediate support member 320, a battery module 20 formed by three battery cell groups 210 corresponds to two intermediate support members 320, and so on.

[0062] An intermediate support member 320 is connected to two adjacent battery cell groups 210. Specifically, part of the intermediate support member 320 is connected to one of the two adjacent battery cell groups 210, and part of the intermediate support member 320 is connected to the other of the two adjacent battery cell groups 210. That is, one intermediate support member 320 is correspondingly connected to the shoulders 213 of the two adjacent battery cell groups 210. In this way, when the number of battery cell groups 210 is the same, the number of required support members 30 can be reduced, thereby improving the assembly efficiency of the support members 30.

[0063] refer to Figure 6 and Fig. 9In some embodiments, a groove 301 may be constructed on the top of the support member 30 , and the groove 301 is filled with a first adhesive 40 . The first adhesive 40 may be a structural adhesive or other adhesives, and the support member 30 and the upper cover 10 are bonded by the first adhesive 40 .

[0064] When connecting the support member 30 and the upper cover 10, the first adhesive 40 can be filled in the groove 301. At this time, the first adhesive 40 is fluid, and the liquid level of the filled first adhesive 40 is higher than the notch of the groove 301. Then the upper cover 10 is covered on the top of the battery cell module 20, and the reinforcing ribs 110 on the upper cover 10 squeeze the first adhesive 40, so that the part of the first adhesive 40 above the notch of the groove 301 flows into the gap between the reinforcing ribs 110 and the support member 30, so as to bond and fix the reinforcing ribs 110 and the support member 30.

[0065] In the implementation manner in which the support member 30 is in a strip shape, the groove 301 may be a long strip groove, and the extension direction of the groove 301 is parallel to the extension direction of the support member 30 .

[0066] refer to Fig. 9 Further, in an implementation in which the plurality of support members 30 include an end support member 310 and an intermediate support member 320, the end support member 310 may be constructed with a groove 301, and the intermediate support member 320 may be constructed with a plurality of grooves 301, and the plurality of grooves 301 are arranged in sequence along the second horizontal direction Y.

[0067] When connecting the support member 30 and the upper cover 10, the first adhesive 40 can be filled in a groove 301 of the middle support member 320, and the liquid level of the filled first adhesive 40 is higher than the notch of the groove 301. Then the upper cover 10 is covered on the top of the battery cell module 20, and the reinforcing ribs 110 on the upper cover 10 squeeze the first adhesive 40 so that the part of the first adhesive 40 above the notch of the groove 301 flows to both sides into other grooves 301. The structural adhesive in the multiple grooves 301 bonds and fixes the reinforcing ribs 110 and the support member 30, so that the reinforcing ribs 110 and the support member 30 are bonded more firmly.

[0068] refer to Figure 6 In some embodiments, a second adhesive 50 may be provided between the bottom of the support member 30 and the battery cell module 20 . The second adhesive 50 may be a structural adhesive or other adhesives. The support member 30 and the battery cell module 20 are bonded by the second adhesive 50 .

[0069] refer to Figure 6In some embodiments, an insulating film 120 may be provided on one side of the upper cover 10 facing the battery cell module 20. The insulating film 120 may be bonded to the inner side of the upper cover 10 by a hot pressing process. The insulating film 120 covers the inner side of the entire upper cover 10 (including the reinforcing ribs 110) and serves as a layer of insulating protection between the support member 30 and the upper cover 10, and between the upper cover 10 and the bus 220.

[0070] refer to Figure 6 In some embodiments, the battery pack may further include a heat conductive member and an insulating member 70 , wherein the insulating member 70 is connected to a side of the bus bar 220 facing the upper cover 10 , and the heat conductive member is disposed between the insulating member 70 and the upper cover 10 .

[0071] Among them, the insulating member 70 can be in the shape of a long plate, the extension direction (length direction) of the insulating member 70 can be parallel to the first horizontal direction X, the insulating member 70 is connected to a plurality of bus bars 220 arranged along the first horizontal direction X, and the insulating member 70 serves as a layer of insulating protection between the bus bar 220 and the upper cover 10.

[0072] The heat conducting member may include a thermally conductive adhesive 60, and the insulating member 70 and the upper cover 10 are bonded by the thermally conductive adhesive 60 to form a heat dissipation path of the bus 220-insulating member 70-thermal conductive adhesive 60-upper cover 10. The thermally conductive adhesive 60 can quickly conduct the heat of the bus 220 to quickly bring the Joule heat generated by the bus 220 when the battery pack is working to the external environment of the battery pack through the upper cover 10, thereby increasing the heat dissipation performance of the bus 220 and avoiding the bus 220 from being overly hot.

[0073] On the basis of the above-mentioned implementation manner, an embodiment of the present application further provides a power battery system, including the battery pack provided in the above-mentioned embodiment.

[0074] The power battery system in this embodiment includes the battery pack in the above embodiment. The specific structure, working principle and function of the battery pack have been described in detail in the above embodiment, and will not be repeated here. For details, please refer to the description of the above embodiment.

[0075] The embodiment of the present application also provides a vehicle, including the power battery system provided in the above embodiment, and the power battery system includes the battery pack provided in the above embodiment. The specific structure, working principle and function of the battery pack have been described in detail in the above embodiment, and will not be repeated here. For details, please refer to the description of the above embodiment.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack, characterized in that: It includes an upper cover, a battery cell module and a plurality of supporting parts; The support member is an insulator, and the support member is connected to a side of the battery module facing the upper cover; A plurality of reinforcing ribs are formed on one side of the upper cover facing the battery core module, the reinforcing ribs correspond to the supporting member, and the reinforcing ribs abut against the supporting member.

2. The battery pack according to claim 1, characterized in that: The battery cell module includes a plurality of battery cell groups, the battery cell group includes a plurality of battery cells, the plurality of battery cells are sequentially arranged along a first horizontal direction, and the plurality of battery cell groups are sequentially arranged along a second horizontal direction, and the second horizontal direction is perpendicular to the first horizontal direction; The support member is in a strip shape, the extension direction of the support member is parallel to the first horizontal direction, and a plurality of the support members are sequentially arranged along the second horizontal direction at two ends of the battery cell group along the second horizontal direction; The reinforcing ribs are also strip-shaped, and the extending direction of the reinforcing ribs is parallel to the first horizontal direction.

3. The battery pack according to claim 2, characterized in that: The plurality of support members include end support members and middle support members, the end support members are close to two ends of the battery module along the second horizontal direction, and the middle support member is located between the two end support members; The end supports are connected to shoulders of the battery cell group at both ends of the second horizontal direction; The intermediate support member is connected to two adjacent battery cell groups, part of the intermediate support member is connected to one of the two adjacent battery cell groups, and part of the intermediate support member is connected to the other of the two adjacent battery cell groups.

4. The battery pack according to claim 1, characterized in that: The top of the support member is configured with a groove, the groove is filled with a first adhesive, and the support member and the upper cover are bonded together by the first adhesive.

5. The battery pack according to claim 1, characterized in that: A second adhesive is provided between the bottom of the support member and the battery cell module, and the support member and the battery cell module are bonded together by the second adhesive.

6. The battery pack according to any one of claims 1 to 5, characterized in that: An insulating film is provided on one side of the upper cover facing the battery core module, and the insulating film covers the reinforcing ribs.

7. The battery pack according to any one of claims 2 to 5, characterized in that: The battery cell includes two poles, and the battery cell module also includes a plurality of busbars, and the busbars are welded to the poles; The battery pack further includes a heat conducting member and an insulating member, wherein the insulating member is connected to a side of the busbar facing the upper cover, and the heat conducting member is disposed between the insulating member and the upper cover.

8. The battery pack according to claim 7, characterized in that: The insulating member is in the shape of a long plate, the extending direction of the insulating member is parallel to the first horizontal direction, and the insulating member is connected to a plurality of the bus bars arranged along the first horizontal direction; The heat-conducting member includes heat-conducting glue, and the insulating member and the upper cover are bonded together by the heat-conducting glue.

9. A power battery system, characterized in that: Comprising a battery pack as described in any one of claims 1 to 8.

10. A vehicle, characterized in that: Comprising the power battery system as claimed in claim 9.

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