Battery cell assembly and battery pack

Abstract

According to the battery cell assembly and the battery pack, when the battery pack is manufactured and produced, battery cells can be directly stacked and welded in the through grooves of the tray, the battery cells are borne through the base plate, and the battery cells are pressed through the short plates after being limited by the barrier strips, so that the battery cells are fixed; compared with the traditional mode that the battery cell modules need to be stacked firstly and then are hoisted into the box, the production process is simpler and is not limited by the length of the battery cell modules, and the energy density is higher.

Description

Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to a battery cell assembly and a battery pack. Background Art

[0002] In the new energy industry, lithium-ion power batteries have become the fastest growing and most widely used in recent years due to their high energy density and excellent cycle efficiency.

[0003] At present, when a battery pack is manufactured, it is necessary to first stack multiple battery cells into modules, and then lift the multiple battery cell modules into a box to form a battery pack. The process is complicated and the box is limited by the length of the battery cell modules, so the energy density of the battery pack is low. Utility Model Content

[0004] The purpose of this application is to provide a battery cell assembly and a battery pack, which has a simpler production process, is not limited by the length of the battery cell module, and has a higher energy density.

[0005] The embodiments of the present application can be implemented as follows:

[0006] In a first aspect, the utility model provides a battery core assembly, comprising:

[0007] The tray comprises a bottom plate and baffles connected to two sides of the bottom plate at an angle, wherein the bottom plate and the baffles together form a through slot;

[0008] A plurality of battery cells are evenly arranged in the through slots;

[0009] End plates are respectively provided at both ends of the through slot, the end plates are arranged at an angle with the chassis, and are detachably connected to the chassis and / or the baffle bar to compress the battery core.

[0010] In an optional embodiment, the battery cell assembly further includes a strap for binding the two end plates and the battery cells.

[0011] In an optional embodiment, a plurality of battery cells are arranged in at least two rows along the length direction of the baffle bar, and the end plate is provided with slots at positions corresponding to the gaps between each two adjacent rows of battery cells to form at least two bundling parts corresponding to each row of battery cells on the end plate, and each row of battery cells is bundled with the corresponding bundling parts by the binding straps.

[0012] In an optional embodiment, the end plate is provided with a first connection hole extending from a side facing away from the chassis to a side close to the chassis, and a first bolt passes through the first connection hole and is connected to the chassis.

[0013] In an optional embodiment, the battery cell assembly further comprises a fixed beam detachably connected to a side of the end plate facing away from the battery cell, the fixed beam is located between the two baffles, and both ends of the fixed beam are detachably connected to the two baffles respectively.

[0014] In an optional embodiment, the fixed crossbeam is provided with a second connection hole extending from a side facing away from the end plate to a side close to the end plate, and a second bolt passes through the second connection hole and is connected to the end plate;

[0015] and / or,

[0016] The baffle is provided with a third connection hole extending from an end facing away from the fixed beam to an end close to the fixed beam, and a third bolt passes through the third connection hole and is connected to the fixed beam.

[0017] In an optional embodiment, the chassis is of a hollow structure to form a cooling channel inside, and a first thermal conductive adhesive is provided on a side of the chassis facing the battery core.

[0018] In an optional embodiment, a plurality of spaced-apart limiting members are provided on the chassis, the battery cells are carried on the limiting members, and the first thermal conductive adhesive is provided in the gaps between adjacent limiting members.

[0019] In a second aspect, the utility model provides a battery pack, comprising:

[0020] The battery cell assembly according to any one of the preceding embodiments;

[0021] The CCS assembly is located on the side of all the cells facing away from the chassis and is welded to the poles of the cells;

[0022] A cooling plate is arranged on a side of the CCS assembly facing away from the battery cell.

[0023] In an optional embodiment, there is a second thermally conductive adhesive between the battery core and the CCS assembly;

[0024] and / or,

[0025] There is a third thermal conductive adhesive between the CCS component and the cooling plate;

[0026] and / or,

[0027] The cooling plate is a liquid cooling plate or a heat dissipation plate;

[0028] and / or,

[0029] The CCS assembly is open at a position corresponding to the explosion-proof valve of each column of battery cells, and the cooling plate is provided with an exhaust groove connected to the explosion-proof valve in an area corresponding to the explosion-proof valve of the battery cell.

[0030] Compared with the prior art, the beneficial effects of the embodiments of the present application include, for example:

[0031] When manufacturing battery packs, the battery cells can be stacked and welded directly in the through slots of the pallet. The battery cells can be supported by the chassis, limited by the baffle bars, and then compressed by the short plates to fix the battery cells. Compared with the traditional method of stacking the battery modules first and then lifting each battery module into the box, the production process is simpler, is not limited by the length of the battery modules, and has a higher energy density. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 This is one of the schematic diagrams of a battery pack according to an embodiment of the present application;

[0034] Figure 2 An exploded view of a battery pack according to an embodiment of the present application;

[0035] Figure 3 A partial explosion diagram of a battery pack according to an embodiment of the present application;

[0036] Figure 4 This is the second schematic diagram of the battery pack according to the embodiment of the present application;

[0037] Figure 5 This is a schematic diagram of a tray according to an embodiment of the present application;

[0038] Figure 6 This is a schematic diagram of an end plate according to an embodiment of the present application;

[0039] Figure 7 A schematic diagram of a battery cell assembly according to an embodiment of the present application;

[0040] Figure 8 It is a cross-sectional view of a battery pack according to an embodiment of the present application.

[0041] Icons: 10-tray; 11-chassis; 12-bar; 13-first thermal conductive adhesive; 14-limiting piece; 15-cooling channel; 16-through groove; 20-end plate; 21-first bolt; 22-slot; 23-bundling part; 30-fixed beam; 31-second bolt; 32-third bolt; 40-binding strap; 50-battery cell; 51-pole; 52-second thermal conductive adhesive; 53-explosion-proof valve; 60-CCS assembly; 61-third thermal conductive adhesive; 70-cooling plate; 71-exhaust groove. DETAILED DESCRIPTION

[0042] 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, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0044] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0045] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0046] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0047] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0048] The following is combined with Figures 1 to 8 , some embodiments of the present application are described in detail. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0049] Please refer to Figures 1 to 3 The embodiment of the present application discloses a battery pack, which mainly includes a cell assembly, a CCS (Cells Contact System) assembly arranged on the cell assembly, and a cooling plate 70 arranged on the CCS assembly 60.

[0050] Combination Figures 4 to 7 The battery cell assembly includes a tray 10, a plurality of battery cells 50 and an end plate 20. The tray 10 is a U-shaped structure as a whole, and can be made of one or more of aluminum alloy extruded profiles, steel materials, and non-metallic materials. It is mainly used as a structural member to support the weight of a plurality of battery cells 50 that are grouped in series or in parallel, and is also a platform for stacking the battery cells 50. The tray 10 includes a chassis 11 and a baffle 12 connected to both sides of the chassis 11 at an angle. The chassis 11 and the baffle 12 together form a through groove 16; a plurality of battery cells 50 are evenly arranged in the through groove 16; and end plates 20 are respectively provided at both ends of the through groove 16. The end plates 20 are arranged at an angle with the chassis 11, and are detachably connected to the chassis 11 and / or the baffle 12 to compress the battery cells 50.

[0051] In this way, when the battery pack is manufactured, the battery cells 50 can be directly stacked and welded in the through grooves 16 of the tray 10, and the battery cells 50 are supported by the chassis 11, limited by the baffle bars 12, and then compressed by the short plates to fix the battery cells 50. Compared with the traditional method of stacking the battery cell 50 modules first and then hoisting each battery cell 50 module into the box, the production process is simpler, is not limited by the length of the battery cell 50 module, and has a higher energy density.

[0052] In this embodiment, two long sides opposite to each other in the width direction of the chassis 11 are respectively provided with vertically connected baffles 12, the thickness direction of the battery cell 50 is in the same direction as the length direction of the chassis 11, and the plate surface of the end plate 20 is perpendicular to the length direction of the chassis 11 and the baffles 12. Of course, in some embodiments, two short sides opposite to each other in the length direction of the chassis 11 may also be provided with vertically connected baffles 12, as long as the through grooves 16 for stacking the battery cells 50 can be formed.

[0053] Specifically, when stacking the battery cells 50, one end plate 20 may be installed on the chassis 11 first, and then the battery cells 50 may be stacked next to the end plate 20. After the stacking is completed, another end plate 20 may be installed on the chassis 11, so that the two short plates can jointly press the stacked battery cells 50 to keep the battery cells 50 fixed.

[0054] Continue to refer Figure 4 In order to realize the assembly between the baffle and the tray 10, the end plate 20 is provided with a first connecting hole extending from the side facing away from the chassis 11 to the side close to the chassis 11. The first bolt 21 passes through the first connecting hole and is connected to the chassis 11, thereby realizing the detachable connection between the end plate 20 and the chassis 11.

[0055] In order to improve the connection strength between the end plate 20 and the tray 10, the Figure 1 , Figure 4 and Figure 7 Therefore, the battery cell assembly also includes a fixed beam 30 detachably connected to the side of the end plate 20 facing away from the battery cell 50, and the length extension direction of the fixed beam 30 is along the width direction of the chassis 11. The fixed beam 30 is located between the two baffles 12, and the two ends of the fixed beam 30 are detachably connected to the two baffles 12 respectively.

[0056] Specifically, the fixed beam 30 is provided with a second connection hole extending from the side facing away from the end plate 20 to the side close to the end plate 20, and the second bolt 31 passes through the second connection hole and is connected to the end plate 20; the blocking bar 12 is provided with a third connection hole extending from the end facing away from the fixed beam 30 to the end close to the fixed beam 30, and the third bolt 32 passes through the third connection hole and is connected to the fixed beam 30. In this way, the fixed beam 30 and the end plate 20 are detachably connected.

[0057] In order to cool the battery cell 50 from the bottom of the battery cell 50 , the chassis 11 is configured to be a hollow structure to form a cooling channel 15 inside the chassis 11 , and a first thermal conductive adhesive 13 is provided on one side of the chassis 11 facing the battery cell 50 .

[0058] In this way, after the battery cell 50 is placed on the chassis 11, the heat generated by the battery cell 50 during charging and discharging can be transferred to the coolant in the cooling channel 15 inside the chassis 11 through the first thermal conductive adhesive 13, so that the heat generated by the battery cell 50 can be taken away by the coolant, thereby cooling the battery cell 50.

[0059] Optional, continue to refer to Figure 2 , a plurality of spaced-apart limiting members 14 are provided on the chassis 11, and the limiting members 14 are made of non-metallic materials. The battery cell 50 is carried on the limiting members 14, and the gaps between adjacent limiting members 14 have the first thermal conductive adhesive 13, so that the limiting members 14 can stably support the battery cell 50, and the thickness of the limiting members 14 can be used to control the gap between the bottom of the battery cell 50 and the upper surface of the chassis 11, so as to fill the first thermal conductive adhesive 13. Among them, the limiting members 14 are in the shape of long strips, and their length direction is the same as the length direction of the chassis 11.

[0060] In order to better fix the stacked battery cells 50 , the battery cell assembly further includes a binding strap 40 for binding the two end plates 20 and the battery cells 50 .

[0061] In this embodiment, a plurality of battery cells 50 are arranged in at least two rows along the length direction of the baffle bar 12, and the end plate 20 is provided with a slot 22 at a position corresponding to the gap between each two adjacent rows of battery cells 50 to form at least two bundling portions 23 corresponding to each row of battery cells 50 on the end plate 20, and each row of battery cells 50 is bundled with the corresponding bundling portion 23 by a binding strap 40, thereby providing a bundling position for the binding strap 40 by the front and rear bundling portions 23 of each row of battery cells 50, so as to bind each row of battery cells 50 tightly.

[0062] Combination Figure 2 , Figure 3 and Figure 8 The CCS assembly 60 is welded to the pole 51 of the battery cell 50 . The CCS assembly 60 is mainly used to collect status data such as temperature and / or voltage of multiple battery cells 50 to monitor the status of the battery cells 50 .

[0063] The cooling plate 70 is disposed on a side of the CCS assembly 60 facing away from the battery cell 50 , so as to cooperate with the chassis 11 to efficiently cool and dissipate heat for the battery cell 50 .

[0064] In this way, the existing technology can be improved to avoid electrical safety problems caused by external pollution, and the upper cover, lower box, seal and other components are composed of IP65 or above protection level to meet the physical protection requirements. Under the protection of IP65 sealing level, it is necessary to add an explosion relief device to solve the explosion-proof pressure relief and pressure balance in the battery pack. The defects of numerous parts and complex structure can be eliminated, and the design of parts can be reduced, the cost can be reduced, and the design of the battery pack can be simplified while meeting the electrical performance and safety requirements.

[0065] There is a second thermally conductive adhesive 52 between the battery cell 50 and the CCS assembly 60, and there is a third thermally conductive adhesive 61 between the CCS assembly 60 and the cooling plate 70; in this way, the heat generated by the battery cell 50 during charging and discharging can be transferred to the cooling plate 70 through the second thermally conductive adhesive 52 and the third thermally conductive adhesive 61, so as to export the heat of the battery cell 50 from above through the cooling plate 70.

[0066] The cooling plate 70 may be a liquid cooling plate, which can work alone or circulate the coolant together with the chassis 11, optimize the heat dissipation of the battery cell 50, and extend the service life of the battery cell 50. Of course, the cooling plate 70 may also be a heat dissipation plate with a heat dissipation structure such as fins.

[0067] In this way, when the battery cell 50 needs to be charged and discharged at a low rate and generates less heat, only the chassis 11 located at the bottom of the battery cell 50 or the cooling plate 70 located above the battery cell 50 can be used to remove the heat generated by the battery cell 50. When the battery cell needs to be charged and discharged at a high rate and generates more heat, both the chassis 11 and the cooling plate 70 circulate coolant to achieve efficient liquid cooling and heat dissipation on the upper and lower sides of the battery cell 50 at the same time, reducing the temperature gradient of the battery cell 50 in the height direction.

[0068] In addition, by setting the first thermal conductive adhesive 13 below the battery cell 50 and the thermal conductive adhesive above the battery cell 50, the conductive parts involved in the electrical connection can be isolated from the external environment, effectively improving the problem of electrical clearance and creepage distance being affected by environmental humidity, thereby improving electrical safety performance.

[0069] The thermal conductivity coefficients of the first thermal conductive adhesive 13 , the second thermal conductive adhesive 52 and the third thermal conductive adhesive 61 are all greater than 0.5 W / mK to ensure sufficient thermal conductivity.

[0070] Optionally, the CCS assembly 60 is opened at the position of the explosion-proof valve 53 corresponding to each column of battery cells 50, and the cooling plate 70 is provided with an exhaust groove 71 connected to the explosion-proof valve 53 in the area corresponding to the explosion-proof valve 53 of the battery cell 50, so that the thermal runaway gas discharged after the explosion-proof valve 53 opens when thermal runaway occurs in the battery cell 50 can be discharged through the exhaust groove 71, thereby realizing directional exhaust.

[0071] Continue to refer Figure 8 The second thermally conductive adhesive 52 and the third thermally conductive adhesive 61 both avoid the location of the exhaust groove 71, so that there is no obstruction between the explosion-proof valve 53 and the exhaust groove 71, which facilitates the discharge of thermal runaway gas.

[0072] It should also be noted that the second thermally conductive adhesive 52 is provided with an avoidance hole at a position corresponding to the pole 51 , so that the pole 51 passes through the avoidance hole to be welded to the CCS assembly 60 .

[0073] 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 cell assembly, characterized in that: include: A tray (10) comprises a bottom plate (11) and baffles (12) connected to two sides of the bottom plate (11) at an angle, wherein the bottom plate (11) and the baffles (12) together form a through groove (16); A plurality of battery cells (50) are evenly arranged in the through slot (16); End plates (20) are respectively provided at both ends of the through slot (16); the end plates (20) are arranged at an angle with the chassis (11) and are detachably connected to the chassis (11) and / or the baffle (12) to compress the battery cell (50).

2. The battery cell assembly according to claim 1, characterized in that: The battery cell assembly also includes a binding strap (40) for binding the two end plates (20) and the battery cell (50).

3. The battery cell assembly according to claim 2, characterized in that: A plurality of battery cells (50) are arranged in at least two rows along the length direction of the baffle (12); the end plate (20) is provided with a slot (22) at a position corresponding to a gap between two adjacent rows of battery cells (50) so as to form at least two bundling portions (23) corresponding to each row of battery cells (50) on the end plate (20); and each row of battery cells (50) is bound to the corresponding bundling portion (23) by means of the binding belt (40).

4. The battery core assembly according to claim 1, characterized in that: The end plate (20) is provided with a first connection hole extending from a side facing away from the chassis (11) to a side close to the chassis (11), and a first bolt (21) passes through the first connection hole and is connected to the chassis (11).

5. The battery core assembly according to claim 1, characterized in that: The battery cell assembly further comprises a fixed crossbeam (30) detachably connected to a side of the end plate (20) facing away from the battery cell (50), the fixed crossbeam (30) being located between the two baffle bars (12), and the two ends of the fixed crossbeam (30) being detachably connected to the two baffle bars (12).

6. The battery cell assembly according to claim 5, characterized in that: The fixed cross beam (30) is provided with a second connection hole extending from a side facing away from the end plate (20) to a side close to the end plate (20), and a second bolt (31) passes through the second connection hole and is connected to the end plate (20); and / or, The baffle (12) is provided with a third connection hole extending from an end facing away from the fixed beam (30) to an end close to the fixed beam (30), and a third bolt (32) passes through the third connection hole and is connected to the fixed beam (30).

7. The battery cell assembly according to claim 1, characterized in that: The chassis (11) is of a hollow structure to form a cooling channel (15) inside, and a first heat-conducting adhesive (13) is provided on a side of the chassis (11) facing the battery core (50).

8. The battery cell assembly according to claim 7, characterized in that: The chassis (11) is provided with a plurality of spaced-apart limiting members (14), the battery core (50) is supported on the limiting members (14), and the first thermal conductive adhesive (13) is provided in the gaps between adjacent limiting members (14).

9. A battery pack, characterized in that: include: The battery core assembly according to any one of claims 1 to 8; A CCS assembly (60), located on a side of all the battery cells (50) facing away from the chassis (11), and welded to the poles (51) of the battery cells (50); A cooling plate (70) is arranged on a side of the CCS assembly (60) facing away from the battery core (50).

10. The battery pack according to claim 9, characterized in that: A second thermally conductive adhesive (52) is provided between the battery core (50) and the CCS assembly (60); and / or, A third heat-conducting adhesive (61) is provided between the CCS assembly (60) and the cooling plate (70); and / or, The cooling plate (70) is a liquid cooling plate or a heat dissipation plate; and / or, The CCS assembly (60) is open at a position corresponding to the explosion-proof valve (53) of each column of battery cells (50), and the cooling plate (70) is provided with an exhaust groove (71) in communication with the explosion-proof valve (53) in an area corresponding to the explosion-proof valve (53) of the battery cell (50).

Images