Liquid cooling lithium ion battery pack structure

Abstract

The utility model provides a liquid cooling lithium ion battery pack structure. The liquid cooling lithium ion battery pack structure comprises a battery pack body and a liquid cooling plate nested at the top of the battery pack body, the battery pack body comprises a plurality of battery cell monomers which are arranged in parallel, a plurality of hole units are formed in the liquid cooling plate, and the hole units and the battery cell monomers are arranged in a one-to-one correspondence manner; each hole unit comprises a first pole hole, an anti-explosion valve hole and a second pole hole; the first pole column hole is sleeved on a first pole column of the matched battery cell single body, the anti-explosion valve hole is arranged above an anti-explosion valve of the matched battery cell single body, and the second pole column hole is sleeved on a second pole column of the matched battery cell single body. According to the battery module, the top space of the battery cell pole can be reasonably utilized for liquid cooling, so that the volume of the battery module is reduced, the volume energy density of the battery module is effectively improved, and meanwhile, the position deviation between the battery cell monomers can be effectively avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and in particular relates to a liquid-cooled lithium-ion battery pack structure. Background Art

[0002] As lithium-ion batteries become increasingly popular in the electric vehicle and energy storage markets, there is an increasing demand for longer battery life in electric vehicles and higher space utilization in the energy storage market, which in turn places higher demands on the volume energy density of battery modules.

[0003] During the charging and discharging process, lithium-ion battery packs generate a lot of heat; if the heat is not dissipated in time, it will affect the performance and service life of the battery. Liquid cooling technology can remove the heat generated by the battery through the circulation of coolant, so that the battery temperature is kept within a stable range, which helps to improve the efficiency of the battery and extend its service life. However, the conventional liquid cooling arrangement will occupy part of the battery module space, reducing the volume energy density and space utilization of the lithium-ion battery pack. Utility Model Content

[0004] The present invention provides a liquid-cooled lithium-ion battery pack structure, which aims to solve the problems that the existing liquid-cooled arrangement method occupies the battery module space, reduces the volume energy density and space utilization of the lithium battery pack, and the like.

[0005] To achieve the above-mentioned purpose, the embodiment of the utility model provides a liquid-cooled lithium-ion battery pack structure, including a battery pack body and a liquid cooling plate nested on the top of the battery pack body;

[0006] The battery pack body comprises a plurality of battery cells arranged in parallel, and the liquid cooling plate is provided with a plurality of hole units, and the hole units are arranged in one-to-one correspondence with the battery cells;

[0007] Each of the hole units includes a first pole hole, an explosion-proof valve hole and a second pole hole; the first pole hole is sleeved on the first pole of the corresponding battery cell, the explosion-proof valve hole is arranged above the explosion-proof valve of the corresponding battery cell, and the second pole hole is sleeved on the second pole of the corresponding battery cell.

[0008] As a preferred implementation, the first pole hole is matched with the first pole, the explosion-proof valve hole is matched with the explosion-proof valve, and the second pole hole is matched with the second pole.

[0009] As a preferred embodiment, the height of the first pole / the second pole protruding from the battery cell is 3 mm to 10 mm.

[0010] As a preferred embodiment, the inner diameter of the first pole hole is 0.5 mm to 1.5 mm larger than the outer diameter of the first pole; the inner diameter of the second pole hole is 0.5 mm to 1.5 mm larger than the outer diameter of the second pole.

[0011] As a preferred embodiment, the thickness of the liquid cooling plate is 0.3 mm to 1.5 mm smaller than the height of the first pole / the second pole.

[0012] As a preferred embodiment, the first pole hole is a circular hole, an elliptical hole or a square hole; the explosion-proof valve hole is a circular hole, an elliptical hole or a square hole; the second pole hole is a circular hole, an elliptical hole or a square hole.

[0013] As a preferred embodiment, a plurality of the battery cells are connected in series or in parallel via a connecting piece; the connecting piece is disposed on a side of the liquid cooling plate away from the battery cells, one end of the connecting piece is connected to the first pole, and the other end is connected to the second pole.

[0014] As a preferred embodiment, a first insulating layer is coated on the side of the liquid cooling plate close to the connecting piece, so as to avoid the liquid cooling plate contacting the connecting piece and causing a short circuit of the battery pack.

[0015] As a preferred embodiment, a second insulating layer is coated on the side of the connecting piece close to the liquid cooling plate, so as to further avoid the liquid cooling plate and the connecting piece from contacting and causing a short circuit in the battery pack.

[0016] As a preferred implementation, the first pole is a positive pole, the second pole is a negative pole, and the battery cell is a square battery cell.

[0017] As a preferred embodiment, the battery pack body also includes a first clamping plate, a second clamping plate, a first strap and a second strap, the first clamping plate and the second clamping plate are symmetrically abutted on both sides of the battery pack body, the first strap is arranged at the top end of the battery pack body, and the second strap is arranged at the bottom end of the battery pack body, and the first strap and the second strap are symmetrically arranged.

[0018] As a preferred embodiment, the first and second grooves are arranged on the side of the first clamping plate away from the battery cell and the side of the second clamping plate away from the battery cell, and the first and second grooves on the same clamping plate are symmetrically arranged;

[0019] One end of the first strap is clamped in the first groove of the first clamping plate, and the other end is clamped in the first groove of the second clamping plate; one end of the second strap is clamped in the second groove of the first clamping plate, and the other end is clamped in the second groove of the second clamping plate.

[0020] Compared with the prior art, this application has the following technical effects and advantages:

[0021] (1) By nesting the liquid cooling plate between the poles of the battery cell, the present application can reasonably utilize the top space of the battery cell poles for liquid cooling, thereby reducing the volume of the battery module and effectively improving the volume energy density of the battery module.

[0022] (2) By nesting the liquid cooling plate between the poles of the battery cells and playing a certain role of clamping the battery cells, positional displacement between the battery cells can be effectively avoided.

[0023] (3) The battery poles and connecting plates are the locations where the overcurrent of the battery pack is relatively concentrated, and a lot of heat is generated; in addition to cooling the top of the battery cell, the liquid cooling plate of the present application also cools the battery poles and connecting plates, which can further reduce the heat of the battery pack, increase the safety performance of the battery pack, and improve the space utilization of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0025] Figure 1 This is a schematic structural diagram of a liquid-cooled lithium-ion battery pack structure according to an embodiment of the present utility model;

[0026] Figure 2 yes Figure 1 A schematic diagram of the structure of a liquid cooling plate of a liquid-cooled lithium-ion battery pack structure;

[0027] Figure 3 yes Figure 1 A schematic diagram of the structure of a battery pack body of a liquid-cooled lithium-ion battery pack structure;

[0028] Figure 4 yes Figure 3 Schematic diagram of the structure of the battery cell monomer of the battery pack body. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present utility model are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present utility model.

[0030] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0031] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0033] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0034] Specifically, Figures 1 to 4 As shown, the embodiment of the utility model provides a liquid-cooled lithium-ion battery pack structure, including a battery pack body 10 and a liquid cooling plate 20 nested on the top of the battery pack body 10;

[0035] The battery pack body 10 includes a plurality of battery cells 11 arranged in parallel, and the liquid cooling plate 20 is provided with a plurality of hole units 21, and the hole units 21 are arranged one by one corresponding to the battery cells 11;

[0036] Each of the hole units 21 includes a first pole hole 211, an explosion-proof valve hole 212 and a second pole hole 213; the first pole hole 211 is sleeved on the first pole 111 of the corresponding battery cell 11, the explosion-proof valve hole 212 is arranged above the explosion-proof valve 112 of the corresponding battery cell 11, and the second pole hole 213 is sleeved on the second pole 113 of the corresponding battery cell 11.

[0037] As a preferred embodiment, the first pole hole 211 is matched with the first pole 111 , the explosion-proof valve hole 212 is matched with the explosion-proof valve 112 , and the second pole hole 213 is matched with the second pole 113 .

[0038] As a preferred embodiment, the height of the first pole 111 / the second pole 113 protruding from the battery cell 11 is 3 mm to 10 mm (depending on the actual use requirements, it can be 3 mm, 6 mm, 10 mm, etc.).

[0039] As a preferred embodiment, the inner diameter of the first pole hole 211 is 0.5 mm to 1.5 mm larger than the outer diameter of the first pole 111 (depending on the actual use requirements, it can be 0.5 mm, or 1.0 mm, or 1.5 mm, etc.); the inner diameter of the second pole hole 213 is 0.5 mm to 1.5 mm larger than the outer diameter of the second pole 113 (depending on the actual use requirements, it can be 0.5 mm, or 1.0 mm, or 1.5 mm, etc.).

[0040] As a preferred embodiment, the thickness of the liquid cooling plate 20 is 0.3 mm to 1.5 mm smaller than the height of the first pole 111 / the second pole 113 (depending on actual use requirements, it can be 0.3 mm, 1.0 mm, 1.5 mm, etc.).

[0041] As a preferred embodiment, the first pole hole 211 is a circular hole, an elliptical hole or a square hole; the explosion-proof valve hole 212 is a circular hole, an elliptical hole or a square hole; the second pole hole 213 is a circular hole, an elliptical hole or a square hole.

[0042] As a preferred embodiment, a plurality of the battery cells 11 are connected in series or in parallel via a connecting piece 30; the connecting piece 30 is disposed on the side of the liquid cooling plate 20 away from the battery cell 11, one end of the connecting piece 30 is connected to the first pole 111, and the other end is connected to the second pole 113.

[0043] As a preferred embodiment, a first insulating layer (not marked in the figure) is coated on the side of the liquid cooling plate 20 close to the connecting piece 30. In this way, the liquid cooling plate 20 can be prevented from contacting the connecting piece 30 and causing a short circuit in the battery pack.

[0044] As a preferred embodiment, a second insulating layer (not marked in the figure) is coated on the side of the connecting piece 30 close to the liquid cooling plate 20. In this way, the liquid cooling plate 20 and the connecting piece 30 can be further prevented from contacting and causing a short circuit in the battery pack.

[0045] As a preferred embodiment, the first pole 111 is a positive pole, the second pole 113 is a negative pole; and the battery cell 11 is a square battery cell.

[0046] As a preferred embodiment, the battery pack body 10 also includes a first clamping plate 12, a second clamping plate 13, a first strap 14 and a second strap 15, the first clamping plate 12 and the second clamping plate 13 are symmetrically abutted on both sides of the battery pack body 10, the first strap 14 is arranged at the top end of the battery pack body 10, and the second strap 15 is arranged at the bottom end of the battery pack body 10, and the first strap 14 and the second strap 15 are symmetrically arranged.

[0047] As a preferred embodiment, a first groove (not marked in the figure) and a second groove (not marked in the figure) are provided on the side of the first clamping plate 12 away from the battery cell 11 and the side of the second clamping plate 15 away from the battery cell 11, and the first groove and the second groove on the same clamping plate are symmetrically arranged;

[0048] One end of the first strap 14 is clamped in the first groove of the first clamp plate 12 , and the other end is clamped in the first groove of the second clamp plate 13 ; one end of the second strap 15 is clamped in the second groove of the first clamp plate 12 , and the other end is clamped in the second groove of the second clamp plate 13 .

[0049] By nesting the liquid cooling plate between the poles of the battery cell, the present application can reasonably utilize the top space of the battery cell poles for liquid cooling, thereby reducing the volume of the battery module and effectively improving the volume energy density of the battery module.

[0050] In addition, by nesting the liquid cooling plate between the poles of the battery cells, the battery cells are fixed to a certain extent by means of a sleeve, which can effectively avoid positional displacement between the battery cells.

[0051] The battery poles and connecting plates are locations where the overcurrent of the battery pack is relatively concentrated, and they generate a lot of heat. In addition to cooling the top of the battery cell, the liquid cooling plate of the present application also cools the battery poles and connecting plates, which can further reduce the heat of the battery pack, increase the safety performance of the battery pack, and improve the space utilization of the battery pack.

[0052] In the description of this specification, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0053] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A liquid-cooled lithium-ion battery pack structure, characterized in that: It includes a battery pack body and a liquid cooling plate nested on the top of the battery pack body; The battery pack body comprises a plurality of battery cells arranged in parallel, and the liquid cooling plate is provided with a plurality of hole units, and the hole units are arranged in one-to-one correspondence with the battery cells; Each of the hole units includes a first pole hole, an explosion-proof valve hole and a second pole hole; the first pole hole is sleeved on the first pole of the corresponding battery cell, the explosion-proof valve hole is arranged above the explosion-proof valve of the corresponding battery cell, and the second pole hole is sleeved on the second pole of the corresponding battery cell.

2. The liquid-cooled lithium-ion battery pack structure according to claim 1, characterized in that: The first pole hole is matched with the first pole, the explosion-proof valve hole is matched with the explosion-proof valve, and the second pole hole is matched with the second pole.

3. The liquid-cooled lithium-ion battery pack structure according to claim 1, characterized in that: The height of the first pole / the second pole protruding from the battery cell is 3 mm to 10 mm.

4. The liquid-cooled lithium-ion battery pack structure according to claim 1, characterized in that: The inner diameter of the first pole hole is 0.5 mm to 1.5 mm larger than the outer diameter of the first pole; the inner diameter of the second pole hole is 0.5 mm to 1.5 mm larger than the outer diameter of the second pole.

5. The liquid-cooled lithium-ion battery pack structure according to claim 1, characterized in that: The thickness of the liquid cooling plate is 0.3 mm to 1.5 mm smaller than the height of the first pole / the second pole.

6. The liquid-cooled lithium-ion battery pack structure according to claim 1, characterized in that: The first pole hole is a circular hole, an elliptical hole or a square hole; the explosion-proof valve hole is a circular hole, an elliptical hole or a square hole; the second pole hole is a circular hole, an elliptical hole or a square hole.

7. The liquid-cooled lithium-ion battery pack structure according to claim 1, characterized in that: Several of the battery cells are connected in series or in parallel via a connecting piece; the connecting piece is arranged on the side of the liquid cooling plate away from the battery cells, one end of the connecting piece is connected to the first pole, and the other end is connected to the second pole.

8. The liquid-cooled lithium-ion battery pack structure according to claim 7, characterized in that: A first insulating layer is coated on the side of the liquid cooling plate close to the connecting piece; A second insulating layer is coated on the side of the connecting piece close to the liquid cooling plate; The first pole is a positive pole, the second pole is a negative pole, and the battery cell is a square battery cell.

9. The liquid-cooled lithium-ion battery pack structure according to claim 1, characterized in that: The battery pack body also includes a first clamping plate, a second clamping plate, a first strap and a second strap, the first clamping plate and the second clamping plate are symmetrically abutted on both sides of the battery pack body, the first strap is arranged at the top end of the battery pack body, and the second strap is arranged at the bottom end of the battery pack body, and the first strap and the second strap are symmetrically arranged.

10. The liquid-cooled lithium-ion battery pack structure according to claim 9, characterized in that: A first groove and a second groove are provided on the side of the first clamping plate away from the battery cell and the side of the second clamping plate away from the battery cell, and the first groove and the second groove on the same clamping plate are symmetrically arranged; One end of the first strap is clamped in the first groove of the first clamping plate, and the other end is clamped in the first groove of the second clamping plate; one end of the second strap is clamped in the second groove of the first clamping plate, and the other end is clamped in the second groove of the second clamping plate.

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