CN220984642U - Battery module and battery pack - Google Patents

Abstract

The utility model belongs to the technical field of battery heat dissipation, and particularly discloses a battery module, wherein a cold plate is clamped between two adjacent battery cell groups, and through the mutual matching between the cold plate and a bottom plate arranged below the battery cell groups, the strength of the battery module is improved. And the area of the second side is smaller, so that the size of the cold plate can be correspondingly reduced, the cost is reduced, the occupied space is smaller, the battery module structure is more concentrated, the space utilization rate is high, and a large amount of heat at the pole column of the square shell battery core can be led out by using a smaller space. The utility model also provides a battery pack comprising the battery module.

Description

Battery module and battery pack

Technical Field

The utility model relates to the technical field of battery heat dissipation, in particular to a battery module and a battery pack.

Background

At present, the existing battery PACK is usually assembled in a PACK by separating a liquid cooling plate and a battery module, so as to cool the battery module and further control the temperature of the battery module. The liquid cooling plate generally cools the bottom or the top of the battery cell, but the effect of equalizing the temperature of the module is poor in such a cooling mode. Therefore, a technical scheme for cooling the large surface of the battery cell by using the liquid cooling plate also appears, and the technical scheme can play a good role in cooling and homogenizing temperature, but the length of the liquid cooling plate is longer, the occupied space in the battery pack is larger, the space utilization rate is low, and the cooling cost is relatively higher.

Therefore, there is a need for a battery module and a battery pack to solve the above problems.

Disclosure of utility model

The utility model aims to provide a battery module and a battery pack, which can effectively balance the temperature of the module while reducing the cost of a liquid cooling plate, and have good temperature uniformity, small occupied space and high space utilization rate.

To achieve the purpose, the utility model adopts the following technical scheme:

In one aspect, the present utility model provides a battery module, comprising:

A bottom plate;

The battery cell groups are arranged on the bottom plate and are sequentially arranged along the length direction of the bottom plate, each battery cell group comprises a plurality of square shell battery cells, the plurality of square shell battery cells are sequentially arranged along the width direction of the bottom plate, each square shell battery cell comprises a first side face and a second side face, and the heat exchange area of the first side face is larger than that of the second side face;

the cold plate is clamped between two adjacent battery cell groups, a cooling medium flows through the cold plate, and two end faces of the cold plate are respectively in heat exchange contact with the second side faces of the square shell battery cells in the two adjacent battery cell groups.

Optionally, the battery module includes two end plates, two the end plates set up respectively in the both ends of bottom plate length direction, at least two the electric core group sets up two between the end plate.

Optionally, the battery module includes two curb plates, two the curb plate set up respectively in the both ends of bottom plate width direction, every a plurality of in the electric core group square shell electric core presss from both sides and establishes between two the curb plate.

Optionally, the bottom of curb plate corresponds the position of cold plate is equipped with first groove of dodging, the both sides of cold plate bottom form first extension, first groove of dodging is used for making first extension passes, two be equipped with first water inlet and first delivery port on the first extension respectively, the inside first cooling runner that is equipped with of cold plate, first water inlet first delivery port all with first cooling runner intercommunication.

Optionally, the curb plate is equipped with first hem along its length direction's both ends, the corresponding position on the end plate is equipped with the spacing groove, first hem is inlayed and is located in the spacing groove.

Optionally, the top of curb plate along its direction of height is equipped with the second hem, the second hem with the top surface butt of square shell electric core.

Optionally, a reinforcing rib plate is arranged on one side of the side plate, which is away from the square shell battery cell, and the cross section of the reinforcing rib plate is E-shaped.

Optionally, the both sides of bottom plate width direction upwards extend and form the third hem, the third hem parcel in the bottom outside of curb plate, the third hem corresponds the position of cold plate is equipped with the second and dodges the groove, the second dodges the groove and makes first extension passes.

Optionally, the inside integration of bottom plate has the second cooling runner, the one end of bottom plate length direction forms the second extension, second extension department is equipped with second water inlet and second delivery port, the second water inlet the second delivery port all with the second cooling runner intercommunication, it has cooling medium to circulate in the second cooling runner.

In another aspect, the utility model provides a battery pack, which comprises a case and the battery module in any one of the above schemes, wherein the battery module is arranged in the case.

The beneficial effects of the utility model are as follows:

The utility model provides a battery module, wherein a cold plate is clamped between two adjacent battery cell groups, the strength of the battery module is improved by the mutual matching between the cold plate and a bottom plate arranged below the battery cell groups, and the cold plate is arranged on the second side surface of a square shell battery cell in the battery cell groups, namely, the position close to a pole of the square shell battery cell, so that the heat of the square shell battery cell can be effectively and quickly carried away.

The utility model also provides a battery pack, which comprises a box body and the battery module, wherein the battery module is arranged in the box body. The battery module can be integrally installed in the box body or integrally detached from the box body, so that the battery module is convenient to detach and repair and replace. When a certain battery module has a problem, the broken battery module can be disassembled, the whole battery pack does not need to be replaced, and the cost is saved. And the cooling plate structure in the battery module is used for enhancing the heat dissipation efficiency of the battery module, and meanwhile, the cooling plate is tightly attached to the second side face of the square shell battery core. Further, after adding the cold plate, through curb plate, end plate, cold plate three party mutual restriction, also make battery module's overall structure obtain strengthening, effectually promoted module structural strength.

Drawings

Fig. 1 is an exploded view of a battery module provided in an embodiment of the present utility model;

Fig. 2 is a schematic structural diagram of a battery cell group and a cold plate according to an embodiment of the present utility model;

fig. 3 is a schematic view of a structure of a battery module provided in an embodiment of the present utility model;

FIG. 4 is an enlarged view of a portion of FIG. 3 at A;

FIG. 5 is a schematic view of the structure of the bottom, side and cold plates provided in an embodiment of the present utility model;

Fig. 6 is a partial enlarged view at B in fig. 5.

In the figure:

100. A bottom plate; 110. a third flanging; 111. a second avoidance groove; 120. a second extension; 121. a second water inlet; 122. a second water outlet; 200. a cell group; 210. a square shell cell; 211. a first side; 212. a second side; 213. a top surface; 300. a cold plate; 310. a first extension; 311. a first water inlet; 312. a first water outlet; 313. a limit step; 400. an end plate; 410. a limit groove; 420. an insulating pad; 500. a side plate; 510. a first avoidance groove; 520. a first hem; 530. a second flanging; 540. reinforcing rib plates.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

The present embodiment provides a battery module, as shown in fig. 1-3, the battery module includes a base plate 100, and a battery cell group 200 and a cold plate 300 disposed on the base plate 100, where the battery cell group 200 is at least two, and the at least two battery cell groups 200 are sequentially arranged along a length direction (i.e., a Y-axis direction shown in fig. 1) of the base plate 100, each battery cell group 200 includes a plurality of square-case battery cells 210, and the plurality of square-case battery cells 210 are sequentially arranged along a width direction (i.e., an X-axis direction shown in fig. 1) of the base plate 100, and the square-case battery cells 210 include a first side 211 and a second side 212, and a heat exchange area of the first side 211 is larger than a heat exchange area of the second side 212, i.e., the first side 211 is a large surface of the square-case battery cell 210. The cold plate 300 is sandwiched between two adjacent cell groups 200, a cooling medium circulates in the cold plate 300, and two end surfaces of the cold plate 300 are respectively in heat exchange contact with the second side surfaces 212 of all the square-shell cells 210 in the two adjacent cell groups 200. Through tests, when the square shell battery cell 210 heats, the temperature of the square shell battery cell is mainly concentrated at the pole, therefore, the cold plate 300 is arranged at the second side surface 212 of the square shell battery cell 210, the cold plate 300 is connected with the second side surface 212 of the square shell battery cell 210 through heat conducting glue, the main heating point of the square shell battery cell 210 and the heat exchange contact of the cold plate 300 are ensured, the pole of the square shell battery cell 210 can be effectively cooled down, the temperature uniformity of the battery module is good, and the size of the cold plate 300 can be correspondingly reduced due to the smaller area of the second side surface 212, the cost is reduced, meanwhile, the cold plate 300 is clamped between two adjacent battery cell groups 200 without arranging a larger assembly gap, the occupied space is smaller, the battery module structure is more concentrated, and the space utilization rate is high.

In addition, in this embodiment, each battery module includes six battery cell groups 200 and five cold plates 300, and each battery cell group 200 includes six square-shell battery cells 210, which is only described as an example in this embodiment. It has good compatibility and expansibility. In other embodiments, other numbers of battery cells 200 may be disposed in the battery module, for example, two, three, four, etc. of the battery cells 200 may be disposed, and the number of the cold plates 300 may be adjusted according to the number of the battery cells 200. Of course, the number of the square-shell cells 210 in each cell group 200 can be adjusted as required, and three, four, five or seven square-shell cells 210 can be disposed in each group, which will not be described in detail herein. By varying the number of cell stacks 200, and the number of square-case cells 210 within each cell stack 200, the requirements of different battery packs are accommodated.

With continued reference to fig. 1 and 3, the battery module in this embodiment further includes two end plates 400 and two side plates 500, by which six cell stacks 200 can be fixed to the bottom plate 100. Specifically, two end plates 400 are respectively disposed at two ends of the bottom plate 100 in the length direction (i.e., in the Y-axis direction shown in fig. 1), and six cell groups 200 are disposed between the two end plates 400, and the two end plates 400 are used for fixing the width direction (i.e., in the Y-axis direction shown in fig. 1) of the square-case cell 210. Optionally, an insulating pad 420 is disposed between the end plate 400 and the cell stack 200, which is identical to the insulating spacer end plate 400 and the cell stack 200. The two side plates 500 are respectively disposed at two ends of the bottom plate 100 in the width direction (i.e., the X-axis direction shown in fig. 1), and the plurality of square-case cells 210 in each cell group 200 are sandwiched between the two side plates 500, where the two side plates 500 are used for fixing the thickness direction (i.e., the X-axis direction shown in fig. 1) of the square-case cells 210.

Further, referring to fig. 5 and 6, in this embodiment, a first avoidance groove 510 is provided at a position of the bottom end of the side plate 500 corresponding to the cold plate 300, two sides of the bottom end of the cold plate 300 form a first extension portion 310, the first avoidance groove 510 is used for allowing the first extension portion 310 to pass through, two sides of the length direction (i.e. the X-axis direction shown in fig. 5) of the cold plate 300 are abutted to the two side plates 500, and the cold plate 300 can support the two side plates 500, so that the soaking effect of the square-case battery cell 210 can be improved through the cold plate 300, and meanwhile, the cold plate 300 can also play a role in reinforcing the whole structure in the battery module. The two first extension parts 310 are respectively provided with a first water inlet 311 and a first water outlet 312, the inside of the cold plate 300 is provided with a first cooling flow passage, and the first water inlet 311 and the first water outlet 312 are communicated with the first cooling flow passage. Through the setting of first extension 310 and first dodge groove 510, conveniently arrange first water inlet 311 and first delivery port 312, avoid first water inlet 311 and first delivery port 312 to occupy battery module's inner space, the structure is compacter, also makes things convenient for cold plate 300 switch-on cold source simultaneously, and operating space is great. Meanwhile, the cold plate 300 and the side plate 500 are connected with each other, so that the strength of the whole battery module is improved, and the battery module and the cross beam of the battery pack are convenient to install.

As an alternative, all cold plates 300 in this embodiment are in series communication. Illustratively, the first water inlet 311 is connected to the first water inlet pipeline on the right side of the first cold plate 300, the first water inlet pipeline is communicated with the cold source, and the first water outlet 312 is connected to the left side of the first cold plate 300. The left side of the next cold plate 300 is a first water inlet 311, the first water inlet 311 is communicated with a first water outlet 312 on the left side of the first cold plate 300 through a connecting pipeline, and the like, serial communication among the cold plates 300 is completed, namely, cooling media among the cold plates 300 are in serpentine circulation, a first water outlet 312 of the last cold plate 300 is communicated with a first water outlet pipeline, and the first water outlet pipeline is communicated with a cold source, so that a complete cooling medium circulation path is formed. Since the first water inlet 311 and the first water outlet 312 are disposed outside the side plate 500, it is convenient to arrange the first water inlet pipe, the connection pipe or the first water outlet pipe, and simultaneously, the operation space is large, it is convenient to communicate each cold plate 300, and the connection between the cold plate 300 and the cold source is completed.

Referring to fig. 4, in this embodiment, a second cooling flow channel is integrated in the bottom plate 100, and a cooling medium flows in the second cooling flow channel. The bottom of the battery cell 210 of the battery shell can be cooled through the arrangement of the second cooling flow channel, so that the heat dissipation and cooling effect of the battery module is further improved, and the temperature balance of the battery module is facilitated. Specifically, a second cooling flow passage is formed inside the bottom plate 100 by machining, and a second extension portion 120 is formed at one end of the bottom plate 100 in the length direction (i.e., in the Y-axis direction shown in fig. 1), and a second water inlet 121 and a second water outlet 122 are provided at the second extension portion 120, and the second water inlet 121 and the second water outlet 122 are both in communication with the second cooling flow passage. Illustratively, the second water inlet 121 and the second water outlet 122 are respectively connected to a second water inlet pipeline and a second water outlet pipeline, and the second water inlet pipeline and the second water outlet pipeline are communicated with the cold source. Through the setting of second extension 120, conveniently arrange second water inlet 121 and second delivery port 122, avoid second water inlet 121 and second delivery port 122 to occupy the inner space of battery module, the structure is compacter, also conveniently connects second water inlet pipeline and second water outlet pipeline simultaneously, and operating space is great, also is convenient for arrange second water inlet pipeline and second water outlet pipeline.

It should be noted that the first cooling flow channel and the second cooling flow channel may share the same cold source. Of course, in some embodiments, the first cooling channel and the second cooling channel may be respectively connected to different cold sources, so as to speed up cooling of the cooling medium and improve cooling effect.

Optionally, in this embodiment, the side plates 500 and the bottom plate 100, and the end plates 400 and the bottom plate 100 are all welded, so that the connection between the three is stable, and six battery modules can be well fixed through the use of the side plates 500 and the end plates 400, so that the structural strength of the whole battery module is ensured.

Further, the two ends of the side plate 500 along the length direction thereof are provided with first folded edges 520, the corresponding positions on the end plate 400 are provided with limit grooves 410, and the first folded edges 520 are embedded in the limit grooves 410. The displacement of the side plate 500 in the height direction of the end plate 400 (i.e., the Z-axis direction shown in fig. 3) can be restricted by the provision of the first folded edge 520 and the stopper groove 410. The top end of the side plate 500 along the height direction is provided with a second folded edge 530, and the second folded edge 530 is abutted with the top surface 213 of the square-shell battery cell 210. The displacement of the cell stack 200 in the height direction of the end plate 400 (i.e., the Z-axis direction shown in fig. 3) can be restricted by the second flange 530. The two sides of the bottom plate 100 in the width direction extend upwards to form a third folded edge 110, the third folded edge 110 wraps the outer side of the bottom end of the side plate 500, and the third folded edge 110 is welded with the side plate 500. In order to avoid the cold plate 300, a second avoiding groove 111 is formed in the third flange 110 at a position corresponding to the cold plate 300, and the second avoiding groove 111 can enable the first extension portion 310 to pass through. Therefore, the end plate 400, the side plate 500 and the bottom plate 100 are mutually limited, and the connecting structure between the end plate 400, the side plate 500 and the bottom plate 100 is more reliable and firm, so that the structural strength of the battery module is improved.

More preferably, a limiting step 313 is further disposed between the first extension portion 310 of the cold plate 300 and the main body portion of the cold plate 300, and the first extension portion 310 is clamped to the outer side of the side plate 500. Generally, when the square battery cell 210 deforms, the deformation occurs along the thickness direction (i.e., the X-axis direction shown in fig. 3) of the square battery cell 210, and due to the arrangement of the limiting step 313, when the square battery cell 210 deforms, the cold plate 300 can play a certain limiting role on the side plate 500, so that the deformation of the side plate 500 is avoided, and the structural strength of the battery module is improved. In addition, a reinforcing rib plate 540 is further arranged on one side, away from the square-shell battery cell 210, of the side plate 500, and the cross section of the reinforcing rib plate 540 is E-shaped. The mechanical strength and bending strength of the side plate 500 can be further improved by providing the reinforcing rib plates 540, and bending deformation of the side plate 500 is avoided.

The embodiment also provides a battery pack, which comprises a box (not shown in the figure) and the battery module, wherein the battery module is arranged in the box. The battery module can be integrally installed in the box body or integrally detached from the box body, so that the battery module is convenient to detach and repair and replace. When a certain battery module has a problem, the broken battery module can be disassembled, the whole battery pack does not need to be replaced, and the cost is saved.

The specific installation steps are as follows:

Firstly, a plurality of square-shell battery cells 210 are sequentially arranged along the thickness direction (i.e. the X-axis direction in fig. 1) to form battery cell groups 200, then a plurality of battery cell groups 200 are sequentially arranged along the width direction (i.e. the Y-axis direction in fig. 1) of the square-shell battery cells 210, and a cold plate 300 is assembled between two adjacent battery cell groups 200. The second side 212 of the square housing cell 210 is operatively connected to the cold plate 300 by a thermally conductive adhesive. It should be noted that the number of the square-shell battery cells 210 in the battery cell group 200 and the number of the battery cell group 200 can be adjusted according to the requirement.

And then, two end plates 400 are arranged at two ends of the arranged plurality of battery cell groups 200 and the cold plate 300 through fixture clamping, and after the end plates 400 are combined, the fixture clamping side plates 500 are continuously used for installation. It should be noted that, the side plate 500 is inserted from an obliquely upper side of the battery cell group 200, so that the first extension portion 310 of the cold plate 300 passes through the first avoiding groove 510, after the insertion, the first extension portions 310 at two ends of the cold plate 300 in the length direction (i.e., in the X-axis direction in fig. 1) are clamped with the side plate 500, meanwhile, two ends of the side plate 500 in the length direction (i.e., in the Y-axis direction in fig. 1) are bent towards the arrangement direction of the end plate 400 to form a first folded edge 520, the first folded edge 520 is clamped into the limiting groove 410 on the end plate 400, the top end of the side plate 500 in the height direction (i.e., in the Z-axis direction in fig. 1) is bent towards the arrangement direction of the battery cell group 200 to form a second folded edge 530, and the second folded edge 530 is abutted against the top surface 213 of the square-case battery cell 210 in the battery cell group 200. The two sides of the bottom plate 100 in the width direction (i.e., the X-axis direction in fig. 1) are bent upward to form a third folded edge 110, the third folded edge 110 is wrapped outside the side plate 500, the third folded edge 110 is welded with the side plate 500, the two sides of the bottom plate 100 in the length direction (i.e., the Y-axis direction in fig. 1) are welded with the end plate 400, and the battery module assembly is completed.

And finally, installing a plurality of battery modules in the box body to form the battery pack.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. A battery module, comprising:

A bottom plate (100);

The battery cell groups (200) are arranged on the bottom plate (100) and are sequentially arranged along the length direction of the bottom plate (100), each battery cell group (200) comprises a plurality of square shell battery cells (210), the square shell battery cells (210) are sequentially arranged along the width direction of the bottom plate (100), each square shell battery cell (210) comprises a first side surface (211) and a second side surface (212), and the heat exchange area of the first side surface (211) is larger than that of the second side surface (212);

The cold plate (300), cold plate (300) clamp locates between two adjacent electric core group (200), it has cooling medium to lead to in cold plate (300), the both ends face of cold plate (300) respectively with adjacent two in electric core group (200) square shell electric core (210) second side (212) heat transfer contact.

2. The battery module according to claim 1, wherein the battery module comprises two end plates (400), the two end plates (400) are respectively disposed at both ends of the bottom plate (100) in the length direction, and at least two of the battery cell groups (200) are disposed between the two end plates (400).

3. The battery module according to claim 2, characterized in that the battery module comprises two side plates (500), the two side plates (500) are respectively arranged at two ends of the bottom plate (100) in the width direction, and a plurality of square-shell cells (210) in each cell group (200) are clamped between the two side plates (500).

4. The battery module according to claim 3, wherein a first avoidance groove (510) is formed at a position, corresponding to the cold plate (300), of the bottom end of the side plate (500), first extension portions (310) are formed at two sides of the bottom end of the cold plate (300), the first avoidance groove (510) is used for enabling the first extension portions (310) to penetrate through, a first water inlet (311) and a first water outlet (312) are respectively formed in the two first extension portions (310), a first cooling flow channel is formed in the cold plate (300), and the first water inlet (311) and the first water outlet (312) are communicated with the first cooling flow channel.

5. The battery module according to claim 3, wherein the side plates (500) are provided with first folded edges (520) at both ends in the length direction thereof, the end plates (400) are provided with limit grooves (410) at corresponding positions, and the first folded edges (520) are embedded in the limit grooves (410).

6. A battery module according to claim 3, wherein a second folded edge (530) is provided at the top end of the side plate (500) in the height direction thereof, and the second folded edge (530) abuts against the top surface (213) of the square-case cell (210).

7. A battery module according to claim 3, wherein a reinforcing rib plate (540) is arranged on one side of the side plate (500) away from the square-shell battery cell (210), and the cross section of the reinforcing rib plate (540) is in an E shape.

8. The battery module according to claim 4, wherein the bottom plate (100) has both sides extending upward in the width direction to form a third folded edge (110), the third folded edge (110) is wrapped around the outer side of the bottom end of the side plate (500), a second avoiding groove (111) is provided on the third folded edge (110) at a position corresponding to the cold plate (300), and the second avoiding groove (111) allows the first extending portion (310) to pass through.

9. The battery module according to any one of claims 1 to 8, wherein a second cooling flow channel is integrated in the bottom plate (100), a second extension portion (120) is formed at one end of the bottom plate (100) in the length direction, a second water inlet (121) and a second water outlet (122) are formed at the second extension portion (120), the second water inlet (121) and the second water outlet (122) are both communicated with the second cooling flow channel, and a cooling medium flows in the second cooling flow channel.

10. A battery pack comprising a case, and the battery module according to any one of claims 1 to 9, the battery module being disposed in the case.