Battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery pack which comprises a shell, a plurality of battery cells and a heat conducting piece, an accommodating cavity is formed in the shell; the plurality of battery cells are arranged in the accommodating cavity in rows, the shell is also provided with a cooling plate attached to the plurality of battery cells, the same side of each battery cell is respectively provided with a pole, a heat dissipation channel is reserved between one side, provided with the pole, of each battery cell and the shell, or one side, provided with the pole, of each row of battery cells is oppositely arranged, and a heat dissipation channel is reserved; the heat conduction piece is connected with the cooling plate and arranged in the heat dissipation channel. According to the utility model, the heat conduction piece is connected with the cooling plate and then is arranged in the heat dissipation channel, and the heat at the busbar is quickly conducted out by utilizing the heat conduction piece, so that the heat of the busbar is quickly dissipated, the busbar is maintained within a proper working temperature, the damage to the battery pack caused by overheating of the busbar is avoided, the service life of the battery pack is favorably prolonged, and the use safety of the battery pack is favorably improved. And moreover, the busbar does not need to be provided with a cooling structure, so that the space utilization rate of the battery pack is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to battery packs. Background Technology

[0002] Currently, battery packs are gradually moving towards high-rate fast charging. High-rate fast charging means a larger charging current, which in turn means greater heat generation.

[0003] Battery packs typically incorporate cooling plates that are attached to the surface of the battery cells to control their temperature. The terminals of each cell are generally electrically connected via busbars. As current flows through the busbars, they generate heat. However, existing cooling plates struggle to effectively control the busbar temperature, leading to overheating at the busbars. This, in turn, causes increased temperature at the cell terminals, resulting in reduced cell capacity, poor charge / discharge efficiency, and ultimately, a shortened battery pack lifespan and compromised safety. Utility Model Content

[0004] In view of this, the present invention provides a battery pack to solve the problem that the busbar of the existing battery pack is prone to overheating, resulting in a shorter battery pack life and poorer safety.

[0005] This utility model provides a battery pack, comprising:

[0006] The shell has an internal cavity;

[0007] Multiple battery cells are arranged in a row in the receiving cavity. The housing is also provided with a cooling plate that is in contact with the multiple battery cells. Each battery cell has a terminal post on the same side. The terminal posts are connected by a busbar. A heat dissipation channel is left between the side of the battery cell with the terminal post and the housing. Alternatively, multiple rows of battery cells are arranged opposite each other with the side of the battery cell with the terminal post, and a heat dissipation channel is left.

[0008] A heat-conducting component is connected to the cooling plate and is disposed within the heat dissipation channel.

[0009] Beneficial effects: This invention utilizes a cooling plate to control the temperature of multiple battery cells within the casing. The heat-conducting component is connected to the cooling plate and installed within the heat dissipation channel. The cooling plate simultaneously cools the heat-conducting component, which then conducts heat from the busbar to the heat dissipation channel. This heat is then dissipated to the outside through the heat dissipation channel, rapidly dissipating heat from the busbar within the channel and maintaining it within a suitable operating temperature. This prevents overheating of the busbar from damaging the battery pack, thus improving battery pack lifespan and safety. Furthermore, the busbar itself does not require a cooling structure, reducing its installation volume and improving the space utilization of the battery pack, as well as lowering the operating cost.

[0010] In one alternative embodiment, the receiving cavity is further provided with a fan facing the heat dissipation channel.

[0011] Beneficial effects: By setting the fan to face the heat dissipation channel, a flowing airflow can be formed in the heat dissipation channel and the direction of the airflow can be guided to quickly expel the hot air from the battery pack, thereby further improving the heat dissipation effect of the busbar.

[0012] In one optional embodiment, the heat-conducting component is provided with a first sub-heat dissipation channel communicating with the receiving cavity;

[0013] A second sub-heat dissipation channel is provided between the heat-conducting component and the side of the multiple battery cells where the electrode post is located, or a second sub-heat dissipation channel is provided between the heat-conducting component and the side of the housing.

[0014] Beneficial effects: By setting up the first sub-heat dissipation channel and the second sub-heat dissipation channel, the heat of the heat-conducting component can be dissipated quickly, thereby indirectly dissipating the heat of the busbar quickly.

[0015] In one optional embodiment, the heat-conducting element is provided with a plurality of first heat dissipation holes on the side opposite to the electrode post;

[0016] And / or, the heat-conducting element is provided with a plurality of second heat dissipation holes on the side opposite to the housing.

[0017] Beneficial effects: By providing multiple first heat dissipation holes on the side of the heat-conducting component opposite to the pole post, and / or providing multiple second heat dissipation holes on the side of the heat-conducting component opposite to the housing, the first sub-heat dissipation channel and the second sub-heat dissipation channel can be connected to achieve heat exchange between the first sub-heat dissipation channel and the second sub-heat dissipation channel, thereby further improving the heat dissipation effect.

[0018] In one alternative embodiment, the fan is located at one end of the heat-conducting element, and the fan faces the first sub-heat dissipation channel.

[0019] Beneficial effects: The fan is directed towards the first sub-heating channel, providing driving force to realize the airflow in the first sub-heating channel. Since the first and second sub-heating channels are connected, it can also indirectly drive the airflow in the second sub-heating channel, thereby quickly dissipating the hot airflow in the first and second sub-heating channels to the outside of the casing.

[0020] In one alternative implementation, the system further includes a battery management system and at least one switch, the fan being electrically connected to the battery management system via the switch.

[0021] Beneficial effects: The battery management system controls the opening and closing of the fan by switching it on and off, thereby controlling the heat dissipation capacity of the busbar and facilitating precise control of the temperature inside the battery pack.

[0022] In one optional embodiment, the heat-conducting element has a first contact portion at one end and a second contact portion at the other end. The first contact portion is in contact with the inner side of the housing, and the second contact portion is in contact with the cooling plate.

[0023] Beneficial effects: The second contact part is in contact with the cooling plate so that the cooling plate can dissipate heat from the heat-conducting component, and the first contact part is in contact with the inner side of the shell to achieve effective support for the heat-conducting component at both ends, which helps to improve the structural stability of the heat-conducting component.

[0024] In one alternative embodiment, the surface of the heat-conducting element is provided with an insulating layer.

[0025] Beneficial effects: Thermal conductive components are usually made of metals with high thermal conductivity. By setting an insulating layer on the surface of the thermal conductive component, it is possible to prevent the thermal conductive component from coming into contact with other components in the battery pack and causing a short circuit.

[0026] In one alternative embodiment, one side of the busbar is attached to the pole, and an insulating sheet is attached to the opposite side.

[0027] Beneficial effects: By fixing an insulating sheet to the busbar, the insulating sheet can prevent the busbar from coming into contact with other components in the battery pack and causing a short circuit, thereby ensuring the electrical safety of the battery pack.

[0028] In one alternative embodiment, the insulating sheet covers the side of the plurality of busbars away from the pole, and the portion of the insulating sheet not covering the busbars is provided with a plurality of third heat dissipation holes at intervals.

[0029] Beneficial effects: The insulating sheet covers the side of multiple busbars furthest from the terminal post, requiring only one insulating sheet to insulate multiple busbars, simplifying installation and use. The portion of the busbar not covered by the insulating sheet has multiple third heat dissipation holes at intervals, allowing airflow between the inside and outside of the insulating sheet and further improving the busbar's heat dissipation. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of a battery pack according to an embodiment of the present utility model;

[0032] Figure 2 for Figure 1 Top view;

[0033] Figure 3 for Figure 2 A sectional view;

[0034] Figure 4 for Figure 3 Enlarged view of point A;

[0035] Figure 5 for Figure 3 Enlarged view of point B;

[0036] Figure 6 This is a partial exploded view of a battery pack according to an embodiment of the present invention.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Housing; 101. Receiving cavity; 102. Cooling plate; 2. Battery cell; 201. Terminal post; 202. Busbar; 203. Insulating sheet; 2031. Third heat dissipation hole; 3. Heat dissipation channel; 301. First sub-heat dissipation channel; 302. Second sub-heat dissipation channel; 4. Thermal conductive component; 401. First heat dissipation hole; 402. Second heat dissipation hole; 403. First contact part; 404. Second contact part; 5. Fan; 6. Battery management system; 7. Switch. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0040] The following is combined Figures 1 to 6 The following describes embodiments of the present invention.

[0041] According to embodiments of the present invention, such as Figure 1 As shown, a battery pack is provided, mainly including: a housing 1, multiple battery cells 2, and a heat-conducting component 4. The housing 1 has an internal receiving cavity 101. Multiple battery cells 2 are arranged in a row within the receiving cavity 101. The housing 1 also has a cooling plate 102 that is in contact with the multiple battery cells 2. Each battery cell 2 has a terminal post 201 on the same side, which is connected via a busbar 202. A heat dissipation channel 3 is provided between the side of the battery cell 2 with the terminal post 201 and the housing 1, or multiple rows of battery cells 2 are arranged opposite each other on the side with the terminal post 201, with a heat dissipation channel 3 provided. The heat-conducting component 4 is connected to the cooling plate 102 and is located within the heat dissipation channel 3.

[0042] Therefore, the battery pack provided in this embodiment of the present invention uses a cooling plate 102 to control the temperature of multiple cells 2 inside the housing 1. The heat-conducting component 4 is connected to the cooling plate 102 and installed in the heat dissipation channel 3. The cooling plate 102 can also cool the heat-conducting component 4. The heat-conducting component 4 is then used to conduct the heat from the busbar 202 to the heat dissipation channel 3. The heat is then dissipated to the outside through the heat dissipation channel 3, thereby quickly dissipating the heat from the busbar 202 in the heat dissipation channel 3, maintaining the busbar 202 within a suitable operating temperature, avoiding overheating of the busbar 202 and preventing damage to the battery pack, which is beneficial to improving the lifespan and safety of the battery pack.

[0043] Moreover, the busbar 202 itself does not require a cooling structure. Compared with the traditional method of increasing the cross-sectional area of ​​the busbar 202 to improve the heat dissipation effect, this utility model embodiment not only meets the heat dissipation requirements of the busbar 202, but also reduces the installation volume of the busbar 202, thereby improving the space utilization of the battery pack and reducing the cost of use, achieving a lightweight design and compact layout.

[0044] Specifically, multiple battery cells 2 can be arranged in one, two, or more rows within the receiving cavity 101 as needed; this embodiment of the invention does not impose excessive restrictions on this. The terminals 201 of adjacent battery cells 2 are electrically connected via a busbar 202. The terminals 201 and busbar 202 can be fixed together by welding, ensuring a secure connection. A cooling plate 102 is used to cool the multiple battery cells 2, and its installation position can be selected as needed. For example, the cooling plate 102 can serve as the bottom plate of the housing 1, with the lower end of the battery cell 2 fixedly connected to the cooling plate 102 and the upper end of the battery cell 2 fixedly connected to the cover plate of the housing 1. The cooling plate 102 contains a liquid cooling circuit, which effectively dissipates heat from the battery cells 2.

[0045] In addition, the housing 1 is also provided with an exhaust hole that communicates with the heat dissipation channel 3 so as to discharge hot air from the housing 1.

[0046] For example, such as Figures 1 to 3 As shown, multiple battery cells 2 are arranged in two rows within the receiving cavity 101. Each row of battery cells 2 has a terminal post 201 at each opposite end, and each of the two rows of battery cells 2 also has a terminal post 201 on one opposite side. A heat dissipation channel 3 is formed between the outer sides of the two rows of battery cells 2 with their terminal posts 201 and the housing 1. A gap is left between the two rows of battery cells 2, forming a heat dissipation channel 3. A heat-conducting element 4 is provided within each heat dissipation channel 3, and the heat-conducting element 4 is arranged parallel to the heat dissipation channel 3, covering the side of the multiple battery cells with their terminal posts 201.

[0047] It should be noted that the material of the heat-conducting component 4 is not limited in this embodiment of the invention, as long as the heat-conducting component 4 can achieve effective heat conduction. For example, the heat-conducting component 4 can be made of aluminum alloy, copper, etc.

[0048] In one embodiment, such as Figure 1 and Figure 2 As shown, the receiving cavity 101 is also equipped with a fan 5 facing the heat dissipation channel 3. By setting the fan 5 facing the heat dissipation channel 3, a flowing airflow can be formed in the heat dissipation channel 3, and the direction of the airflow can be guided to quickly expel the hot airflow from the battery pack, thereby further improving the heat dissipation effect of the busbar 202. When multiple heat dissipation channels 3 are provided, multiple fans 5 are also provided, and multiple fans are provided corresponding to one heat dissipation channel 3.

[0049] In one embodiment, the heat-conducting component 4 is provided with a first sub-heat dissipation channel 301 that communicates with the receiving cavity 101.

[0050] Furthermore, a second sub-heat dissipation channel 302 is provided between the heat-conducting component 4 and the side of the multiple battery cells 2 where the electrode post 201 is provided, or a second sub-heat dissipation channel 302 is provided between the heat-conducting component 4 and the side of the housing 1.

[0051] By setting the first sub-heat dissipation channel 301 and the second sub-heat dissipation channel 302, the heat of the heat conductor 4 can be dissipated quickly, thereby indirectly dissipating the heat of the busbar 202 quickly.

[0052] It should be noted that the structure of the heat-conducting component 4 in this embodiment of the present invention can be selected as a plate, tube, etc., according to actual needs. For example, as Figure 4 As shown, the heat-conducting component 4 is tubular, hollow inside with openings at both ends to form a first sub-heat dissipation channel 301. The heat-conducting component 4 is disposed between two rows of battery cells 2, and the heat-conducting component 4 and the battery cells 2 on both sides respectively form a second sub-heat dissipation channel 302. The first sub-heat dissipation channel 301 and the two second sub-heat dissipation channels 302 together form a heat dissipation channel 3. Of course, the tubular heat-conducting component 4 can also be disposed between the battery cell 2 and the housing 1.

[0053] In addition, such as Figure 5 As shown, the heat-conducting component 4 can also be plate-shaped and disposed between the battery cell 2 and the housing 1. One side of the heat-conducting component 4 forms a second sub-heat dissipation channel 302 between itself and the battery cell 2, and the other side of the heat-conducting component 4 forms another second sub-heat dissipation channel 302 between itself and the housing 1. The two second sub-heat dissipation channels 302 together form the heat dissipation channel 3. Of course, the plate-shaped heat-conducting component 4 can also be disposed between two rows of battery cells 2.

[0054] In one embodiment, such as Figure 6 As shown, the heat-conducting component 4 has multiple first heat dissipation holes 401 on the side opposite to the pole post 201.

[0055] And / or, the heat-conducting component 4 is provided with a plurality of second heat dissipation holes 402 on the side opposite to the housing 1.

[0056] By providing multiple first heat dissipation holes 401 on the side of the heat-conducting component 4 opposite to the pole post 201, and / or providing multiple second heat dissipation holes 402 on the side of the heat-conducting component 4 opposite to the housing 1, the first sub-heat dissipation channel 301 and the second sub-heat dissipation channel 302 can be connected to achieve heat exchange between the first sub-heat dissipation channel 301 and the second sub-heat dissipation channel 302, thereby further improving the heat dissipation effect.

[0057] For example, when the heat-conducting component 4 is tubular and is disposed between the battery cell 2 and the housing 1, the heat-conducting component 4 has a plurality of first heat dissipation holes 401 on the side near the battery cell 2 and a plurality of second heat dissipation holes 402 on the side near the housing.

[0058] It should be noted that the present invention does not limit the opening form of the first heat dissipation hole 401 and the second heat dissipation hole 402. Any opening form can be selected as needed, such as the first heat dissipation hole 401 and the second heat dissipation hole 402 being round holes, strip holes, elliptical holes, etc.

[0059] Furthermore, in one embodiment, such as Figure 6 As shown, fan 5 is located at one end of heat-conducting component 4, and fan 5 faces the first sub-heat dissipation channel 301. By positioning fan 5 towards the first sub-heat dissipation channel 301, it can provide driving force to realize airflow within the first sub-heat dissipation channel 301. Since the first sub-heat dissipation channel 301 and the second sub-heat dissipation channel 302 are connected, it can also indirectly drive airflow within the second sub-heat dissipation channel 302, thereby quickly dissipating the hot airflow within the first sub-heat dissipation channel 301 and the second sub-heat dissipation channel 302 to the outside of the housing 1.

[0060] In one embodiment, such as Figure 1 and Figure 2 As shown, the battery pack also includes a battery management system 6 and at least one switch 7. The fan 5 is electrically connected to the battery management system 6 via the switch 7. The battery management system 6 controls the opening and closing of the fan 5 via the switch 7, thereby controlling the heat dissipation capacity of the busbar 202 and facilitating precise temperature control within the battery pack.

[0061] It should be noted that the present invention does not limit the connection method between the heat-conducting component 4 and the cooling plate 102, as long as the cooling plate 102 can cool and dissipate heat from the heat-conducting component 4. For example, the heat-conducting component 4 and the cooling plate 102 are integrally formed, or the heat-conducting component 4 is welded and fixed to the cooling plate 102, or the heat-conducting component 4 is bonded to the cooling plate 102 with adhesive.

[0062] In one embodiment, such as Figure 5As shown, one end of the heat-conducting component 4 is provided with a first contact portion 403, and the other end is provided with a second contact portion 404. The first contact portion 403 is attached to the inner side of the housing 1, and the second contact portion 404 is attached to the cooling plate 102. The second contact portion 404 is attached to the cooling plate 102 so that the cooling plate 102 can dissipate heat from the heat-conducting component 4. Moreover, the first contact portion 403 is attached to the inner side of the housing 1 to achieve effective support for the two ends of the heat-conducting component 4, which helps to improve the structural stability of the heat-conducting component 4.

[0063] Specifically, such as Figure 5 As shown, the upper end of the heat-conducting component 4 is bent and fixedly attached to the inner side of the housing 1, and the lower end of the heat-conducting component 4 is bent and fixedly attached to the cooling plate 102.

[0064] In one embodiment, an insulating layer is provided on the surface of the heat-conducting component 4. The heat-conducting component 4 is typically made of a metal with high thermal conductivity. By providing an insulating layer on the surface of the heat-conducting component 4, it is possible to prevent the heat-conducting component 4 from coming into contact with other components in the battery pack and causing a short circuit. The insulating layer can be made of insulating varnish, insulating film, etc.

[0065] In one embodiment, such as Figure 4 and Figure 5 As shown, one side of the busbar 202 is attached to the terminal post 201, and the other side is attached to an insulating sheet 203. The insulating sheet 203 is fixedly attached to the busbar 202 to prevent the busbar 202 from coming into contact with other components in the battery pack and causing a short circuit, thereby ensuring the electrical safety of the battery pack.

[0066] It should be noted that this embodiment of the utility model does not limit the bonding method between the busbar 202 and the pole post 201 and the insulating sheet 203. Any existing method can be selected as needed. For example, the busbar 202 can be bonded and fixed to the pole post 201 and the insulating sheet 203 respectively with adhesive, and the connection is tight.

[0067] Furthermore, in one embodiment, such as Figure 6 As shown, an insulating sheet 203 covers the side of multiple busbars 202 away from the terminal post 201. The portion of the insulating sheet 203 not covering the busbars 202 has multiple third heat dissipation holes 2031 spaced apart. By covering the side of the multiple busbars 202 away from the terminal post 201 with the insulating sheet 203, insulation of multiple busbars 202 can be achieved with only one insulating sheet 203, facilitating installation and use. The multiple third heat dissipation holes 2031 spaced apart on the portion of the insulating sheet 203 allow air to pass between the inner and outer areas of the insulating sheet 203, further improving the heat dissipation effect of the busbars 202.

[0068] It should be noted that the present invention does not limit the opening form of the third heat dissipation hole 2031. Any opening form can be selected as needed, such as the third heat dissipation hole 2031 being a round hole, a strip hole, an elliptical hole, etc.

[0069] To achieve the basic functions of the battery pack, the battery pack in this embodiment may also include other necessary modules or components, such as a battery control system and wiring. It should be noted that any suitable existing structure can be selected from the other necessary modules or components included in the battery pack. To clearly and concisely illustrate the technical solution provided in this embodiment, the above-mentioned parts will not be repeated here, and the accompanying drawings have also been simplified accordingly. However, it should be understood that the scope of the embodiments of this utility model is not limited thereto.

[0070] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery pack, characterized in that, include: The shell has an internal cavity; Multiple battery cells are arranged in a row in the receiving cavity. The housing is also provided with a cooling plate that is in contact with the multiple battery cells. Each battery cell has a terminal post on the same side. The terminal posts are connected by a busbar. A heat dissipation channel is left between the side of the battery cell with the terminal post and the housing. Alternatively, multiple rows of battery cells are arranged opposite each other with the side of the battery cell with the terminal post, and a heat dissipation channel is left. A heat-conducting component is connected to the cooling plate and is disposed within the heat dissipation channel.

2. The battery pack according to claim 1, characterized in that, The cavity is also equipped with a fan that faces the heat dissipation channel.

3. The battery pack according to claim 2, characterized in that, The heat-conducting component is provided with a first sub-heat dissipation channel that communicates with the receiving cavity; A second sub-heat dissipation channel is provided between the heat-conducting component and the side of the multiple battery cells where the electrode post is located, or a second sub-heat dissipation channel is provided between the heat-conducting component and the side of the housing.

4. The battery pack according to claim 3, characterized in that, The heat-conducting component has multiple first heat dissipation holes on the side opposite to the electrode post; And / or, the heat-conducting component is provided with a plurality of second heat dissipation holes on the side opposite to the housing.

5. The battery pack according to claim 4, characterized in that, The fan is located at one end of the heat-conducting component, and the fan faces the first sub-heat dissipation channel.

6. The battery pack according to claim 2, characterized in that, It also includes a battery management system and at least one switch, through which the fan is electrically connected to the battery management system.

7. The battery pack according to any one of claims 1 to 6, characterized in that, One end of the heat-conducting component is provided with a first contact portion, and the other end is provided with a second contact portion. The first contact portion is in contact with the inner side of the housing, and the second contact portion is in contact with the cooling plate.

8. The battery pack according to any one of claims 1 to 6, characterized in that, The surface of the heat-conducting component is provided with an insulating layer.

9. The battery pack according to any one of claims 1 to 6, characterized in that, One side of the busbar is attached to the pole, and the other side is attached to an insulating sheet.

10. The battery pack according to claim 9, characterized in that, The insulating sheet covers the side of the multiple busbars away from the pole, and the portion of the insulating sheet not covering the busbars is provided with multiple third heat dissipation holes at intervals.

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