Battery module cooling device and battery pack

Abstract

The utility model relates to the technical field of battery pack cooling, and discloses a battery module cooling device and a battery pack, the battery module cooling device mainly comprises a cooling pipe, a heat conduction piece and at least one busbar, the cooling pipe is provided with a cavity along the axial direction, a cooling medium is arranged in the cavity, and the two ends of the cavity are closed; the cooling pipe is sleeved with the heat conduction piece, and one end of the heat conduction piece is connected with the busbar. The cooling pipe cools the busbar through the heat conduction piece. According to the utility model, the heat of the busbar is conducted to the cooling pipe by utilizing the heat conduction piece and is absorbed by the cooling medium in the cooling pipe, so that the heat dissipation capability of the busbar is improved, the heat dissipation effect is obvious, and the charging rate of the battery module is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery pack cooling, in particular to a battery module cooling device and a battery pack. Background Art

[0002] With the development of new energy vehicles, users have higher expectations and demands for the charging speed of new energy vehicles. To this end, existing battery modules are gradually moving towards high-rate fast charging to achieve fast charging in a short time.

[0003] The high-rate fast charging scenario has high requirements for the cooling of the battery cells of the battery module. On the one hand, the connection points of the battery cells under high-rate fast charging have a small contact area and generate a lot of heat, which easily leads to an increase in the temperature of the battery cells. On the other hand, the busbars connected in series on the positive and negative poles of the battery cells will also generate a lot of heat. Since the positive and negative poles of the battery cells are connected to the ears of the winding core through the intermediate transition part, the increase in the busbar temperature will also cause the battery cell temperature to rise. Excessive increase in the battery cell temperature will destroy the chemical balance of the battery module, resulting in a decrease in the charging rate of the battery module. Utility Model Content

[0004] In view of this, the utility model provides a battery module cooling device and a battery pack to solve the problem that the temperature of the bus bar continues to rise during operation, causing the temperature of the battery cell to rise excessively, resulting in a decrease in the charging rate of the battery module.

[0005] In a first aspect, the utility model provides a battery module cooling device, comprising:

[0006] The cooling pipe is provided with a cavity along the axial direction, wherein a cooling medium is provided in the cavity and both ends are closed;

[0007] A heat conducting member and at least one bus bar, wherein the heat conducting member is sleeved outside the cooling tube and one end of the heat conducting member is connected to the bus bar;

[0008] The cooling pipe cools the busbar through the heat conducting member.

[0009] Beneficial effect: The utility model uses a heat conductor to conduct the heat of the busbar to the cooling pipe, and the heat is absorbed by the cooling medium in the cooling pipe to achieve heat dissipation. The heat dissipation effect is significant, which is beneficial to improving the charging and discharging capacity of the battery module, thereby increasing the charging rate of the battery module. In addition, the cooling medium is stored in a closed cavity, which can prevent the cooling medium from leaking.

[0010] In an optional embodiment, a gap is left between the heat conducting member and the cooling pipe, and the cooling medium vaporizes when the temperature is higher than a preset temperature and causes the cooling pipe to expand to fill the gap.

[0011] Beneficial effects: When the temperature of the cooling medium is higher than the preset temperature, the cooling medium vaporizes and continuously absorbs heat during the vaporization process. Moreover, the air pressure in the cavity of the cooling pipe increases, causing the pipe wall of the cooling pipe to expand to fill the gap between the heat conducting member and the cooling pipe, thereby expanding the contact area between the cooling pipe and the heat conducting member and further improving the heat dissipation capacity. Leaving a gap between the cooling pipe and the heat conducting member can also provide an expansion buffer space for the cooling pipe.

[0012] In an optional embodiment, the heat conducting member includes a plurality of pairs of sub-heat conducting members arranged in pairs. The plurality of pairs of sub-heat conducting members are sequentially and spacedly sleeved outside the cooling pipe, and each pair of sub-heat conducting members is correspondingly connected to one of the bus bars.

[0013] Beneficial effects: Each pair of sub-heat conducting members is correspondingly connected to one bus bar to uniformly absorb the heat of all the bus bars. The plurality of pairs of sub-heat conducting members arranged in pairs are connected in series, which can uniformly transfer the heat of the plurality of bus bars to the cooling pipe and be quickly absorbed by the cooling medium, and it is also convenient to connect with the cooling pipe.

[0014] In an optional embodiment, one end of the sub-heat conducting member is bent and sleeved outside the cooling pipe, and the opposite end is integrally formed with the bus bar.

[0015] Beneficial effects: One end of the sub-heat conducting member is bent to form a through hole and is sleeved outside the cooling pipe through the through hole. The opposite end is integrally formed with the bus bar, with relatively low processing difficulty and low manufacturing cost.

[0016] In an optional embodiment, the sub-heat conducting member is a metal member, and an insulating layer is provided on the surface of the sub-heat conducting member;

[0017] Or the sub-heat conducting member is made of an insulating material.

[0018] Beneficial effects: The sub-heat conducting member is a metal member with strong heat conduction ability. An insulating layer is provided on the surface of the sub-heat conducting member, or the sub-heat conducting member is made of an insulating member, which can prevent the occurrence of condensed water on the sub-heat conducting member and connect adjacent bus bars, resulting in a short circuit of the battery cell, and is beneficial to improving the use safety of the battery module.

[0019] In an optional embodiment, the heat conducting member is a sleeve adapted to the length of the cooling pipe, and the sleeve is made of an insulating material.

[0020] Beneficial effects: Setting the heat conducting member as a sleeve is convenient for installation and manufacturing. The sleeve made of an insulating material can prevent adjacent bus bars from being connected and causing a short circuit of the battery cell.

[0021] In an optional embodiment, the cooling pipe is a metal member, and an insulating layer is provided on the surface of the cooling pipe;

[0022] Or the cooling pipe is made of insulating material.

[0023] Advantageous effects: When the cooling pipe is a metal part, an insulating layer also needs to be provided on the surface of the cooling pipe, or the cooling pipe is made of insulating material, so as to prevent condensed water from connecting adjacent busbars and causing short circuit of the battery cells, further improving the use safety of the battery module.

[0024] In an alternative embodiment, at least one end of the cooling pipe is provided with a heat exchanger.

[0025] Advantageous effects: By using the heat exchanger to further absorb the heat of the cooling pipe, the heat transfer upper limit of the cooling pipe can be improved, and the heat dissipation effect can be further improved.

[0026] In an alternative embodiment, the heat exchanger includes:

[0027] A heat exchange chamber, provided with an opening groove, and one end of the cooling pipe penetrates into the opening groove;

[0028] A heat exchange fin group, arranged on the outer surface of the heat exchange chamber.

[0029] Advantageous effects: Since one end of the cooling pipe penetrates into the opening groove of the heat exchange chamber, the heat exchange chamber can quickly conduct the heat at the cooling pipe to the heat exchange fin group, and the heat is diffused to the outside by the heat exchange fin group, so as to improve the heat transfer upper limit of the cooling pipe.

[0030] In a second aspect, the present invention also provides a battery pack, including:

[0031] A battery module, provided with a plurality of battery cells arranged in rows, and positive electrode posts and negative electrode posts are alternately arranged on the same side of the plurality of battery cells;

[0032] The above-mentioned battery module cooling device, the busbar is connected to the positive electrode post of one of the battery cells and connected to the negative electrode post of another adjacent battery cell.

[0033] Advantageous effects: Since the battery pack includes the battery module cooling device, it has the same effects as the battery module cooling device, that is, using the heat conducting member to conduct the heat of the busbar to the cooling pipe, and the cooling medium in the cooling pipe absorbs the heat to achieve heat dissipation. The heat dissipation effect is remarkable, which is beneficial to improving the charging and discharging capabilities of the battery module, thereby improving the charging rate of the battery module. In addition, the cooling medium is stored in a closed cavity, which can prevent the cooling medium from leaking. Description of the Drawings

[0034] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0035] Figure 1 Structural schematic diagram of a battery pack according to an embodiment of the present utility model;

[0036] Figure 2 For Figure 1 front view;

[0037] Figure 3 Structural schematic diagram of a battery module cooling device according to an embodiment of the present utility model;

[0038] Figure 4 Structural schematic diagram of a battery module cooling device according to another embodiment of the present utility model;

[0039] Figure 5 Structural schematic diagram of a sub-thermal conduction member and a bus bar of a battery module cooling device according to an embodiment of the present utility model;

[0040] Figure 6 Structural schematic diagram of a cooling pipe of a battery module cooling device according to an embodiment of the present utility model;

[0041] Figure 7 Partial cross-sectional view of a cooling pipe and a thermal conduction member of a battery module cooling device according to an embodiment of the present utility model;

[0042] Figure 8 Partial cross-sectional view of a cooling pipe and a thermal conduction member of a battery module cooling device according to another embodiment of the present utility model;

[0043] Figure 9 Structural schematic diagram of a cooling pipe before expansion and a thermal conduction member of a battery module cooling device according to an embodiment of the present utility model

[0044] Figure 10 For Figure 9 enlarged view of location A in

[0045] Figure 11 Structural schematic diagram of a cooling pipe after expansion and a thermal conduction member of a battery module cooling device according to an embodiment of the present utility model;

[0046] Figure 12 For Figure 10 enlarged view of location B in

[0047] Figure 13Partial structural schematic diagram of a battery module cooling device according to an embodiment of the present invention;

[0048] Figure 14 Structural schematic diagram of a heat exchanger of a battery module cooling device according to an embodiment of the present invention.

[0049] Explanation of reference numerals:

[0050] 1. Cooling pipe; 101. Cavity; 2. Cooling medium; 3. Heat conducting member; 301. Sub-heat conducting member; 4. Heat exchanger; 401. Heat exchange chamber; 402. Heat exchange fin group; 5. Battery module; 501. Battery cell; 6. Bus bar; 601. First sub-bus bar; 602. Second sub-bus bar. Detailed implementation manners

[0051] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0052] When the battery module is in a charging state or a discharging state, the battery cells and the bus bar of the battery module will pass a large current and generate heat. After the temperature of the battery cell exceeds a certain temperature, the internal chemical balance is easily destroyed, and the charging and discharging capabilities are significantly reduced, resulting in a decrease in the charging rate.

[0053] The following will describe the embodiments of the present invention in conjunction with Figures 1 to 14 , the embodiments of the present invention.

[0054] According to an embodiment of the present invention, on the one hand, as shown in Figures 1 to 3 , a battery module cooling device is provided, mainly including: a cooling pipe 1, a heat conducting member 3, and at least one bus bar 6. As shown in Figure 7 and Figure 8 , the cooling pipe 1 is axially provided with a cavity 101, the cavity 101 is provided with a cooling medium 2 and both ends are closed. The heat conducting member 3 is sleeved outside the cooling pipe 1, and one end thereof is connected to the bus bar 6. The cooling pipe 1 cools the bus bar 6 through the heat conducting member 3.

[0055] The battery module cooling device provided by the embodiment of the present invention uses the heat conducting member 3 to conduct the heat of the bus bar 6 to the cooling pipe 1, and the cooling medium 2 in the cooling pipe 1 absorbs the heat to achieve heat dissipation. The heat dissipation effect is remarkable, which is beneficial to improving the charging and discharging capabilities of the battery module 5, thereby increasing the charging rate of the battery module 5.

[0056] In addition, both ends of the cavity 101 are closed to form a sealed space, and the cooling medium 2 is stored in the closed cavity 101 and only flows in the cooling pipe 1, which can prevent the leakage of the cooling medium 2.

[0057] In one embodiment, there is a gap between the heat conducting member 3 and the cooling pipe 1, and when the cooling medium 2 vaporizes at a temperature higher than a preset temperature, the cooling pipe 1 expands to fill the gap. During the vaporization process of the cooling medium 2, it continuously absorbs heat, and the air pressure in the cavity 101 of the cooling pipe 1 increases, causing the wall of the cooling pipe 1 to expand to fill the gap between the heat conducting member 3 and the cooling pipe 1, thereby expanding the contact area between the cooling pipe 1 and the heat conducting member 3 and further improving the heat dissipation capacity. Leaving a gap between the cooling pipe 1 and the heat conducting member 3 can also provide an expansion buffer space for the cooling pipe 1.

[0058] Specifically, as Figure 7 shown, the cooling medium 2 is injected into the cavity 101 of the cooling pipe 1 in advance and does not completely fill the cavity 101 of the cooling pipe 1, that is, there is an initial air pressure in the cavity 101, and the air pressure in the cavity 101 will increase after the cooling medium 2 vaporizes. One end of the heat conducting member 3 is provided with a through hole and is sleeved outside the cooling pipe 1 through the through hole. The through hole can be selected from conventional shapes such as round holes and oval holes. The preset temperature at which the cooling medium 2 vaporizes is related to the chemical system of the battery cell 501 and needs to be selected and set according to the actual situation. As Figure 6 shown, the cooling pipe 1 can be linear, which is convenient for processing and manufacturing.

[0059] Exemplarily, taking the example that after the temperature of the battery module 5 exceeds 40 °C, its charging and discharging capabilities will decrease significantly. The preset temperature at which the cooling medium 2 vaporizes is set to 30 °C. As Figure 7 shown, the cooling medium 2 remains in a liquid state below 30 °C. As Figure 9 and Figure 10 shown, at this time, there is a relatively large gap between the cooling pipe 1 and the heat conducting member 3. As Figure 8 shown, after the temperature of the cooling medium 2 exceeds 30 °C, it gradually vaporizes into a gaseous state. As Figure 11 and Figure 12 shown, at this time, the gap between the cooling pipe 1 and the heat conducting member 3 shrinks, and the contact area expands.

[0060] In one embodiment, as Figure 4 and Figure 5As shown, the heat conducting member 3 includes a plurality of pairs of sub-heat conducting members 301 arranged in pairs. The plurality of pairs of sub-heat conducting members 301 are sequentially and spacedly sleeved outside the cooling pipe 1, and each pair of sub-heat conducting members 301 is correspondingly connected to a bus bar 6. Each pair of sub-heat conducting members 301 is correspondingly connected to a bus bar 6, and a bus bar 6 is connected to the positive electrode post of one battery cell 501 and the negative electrode post of another adjacent battery cell 501 to uniformly absorb the heat of all the bus bars 6. The plurality of pairs of sub-heat conducting members 301 arranged in pairs are connected in series, which can uniformly transfer the heat of the plurality of bus bars 6 to the cooling pipe 1 and be quickly absorbed by the cooling medium 2, and it is also convenient to connect to the cooling pipe 1.

[0061] Further, in one embodiment, as Figure 5 shown, there is a gap between the two sub-heat conducting members 301 arranged in pairs, which can provide space for the thermal expansion and contraction of the sub-heat conducting members 301.

[0062] In one embodiment, as Figure 5 shown, one end of the sub-heat conducting member 301 is bent and sleeved outside the cooling pipe 1, and the opposite end is integrally formed with the bus bar 6.

[0063] Specifically, one end of the sub-heat conducting member 301 is bent to form a through hole, and is sleeved outside the cooling pipe 1 through the through hole. The sub-heat conducting member 301 and the bus bar 6 are made of the same material and integrally formed. For example, the sub-heat conducting member 301 and the bus bar 6 are integrally formed by steel plate welding or casting, with relatively low processing difficulty and low manufacturing cost.

[0064] It should be noted that the embodiment of the present utility model does not limit the material of the sub-heat conducting member 301, and any existing material can be selected according to needs.

[0065] Further, in one embodiment, the sub-heat conducting member 301 is a metal member, with relatively high structural strength and strong heat conduction ability. An insulating layer is provided on the surface of the sub-heat conducting member 301, for example, insulating paint is coated on the surface of the sub-heat conducting member 301. The insulating layer can prevent the condensate from connecting adjacent bus bars 6 and causing a short circuit of the battery cell 501, which is beneficial to further improving the use safety of the battery module 5.

[0066] In some other embodiments, the sub-heat conducting member 301 can also be made of insulating material to omit the coating of the insulating layer, with better safety performance.

[0067] In one embodiment, the heat conducting member 3 is a sleeve adapted to the length of the cooling pipe 1, and the sleeve is made of insulating material. The heat conducting member 3 being set as a sleeve is convenient for installation and manufacture, and the sleeve made of insulating material can prevent adjacent bus bars 6 from being connected and causing a short circuit of the battery cell 501.

[0068] It should be noted that the embodiments of the present utility model do not limit the material of the cooling pipe 1 either, and any existing material can be selected according to needs.

[0069] In one embodiment, the cooling pipe 1 is a metal part, which has relatively high structural strength and strong heat conduction ability. An insulating layer is provided on the surface of the cooling pipe 1. For example, insulating paint is coated on the surface of the cooling pipe 1 to improve the use safety of the battery module 5.

[0070] In some other embodiments, the cooling pipe 1 can also be made of insulating material to omit the coating of the insulating layer, and the safety performance is better.

[0071] After the cooling medium 2 in the cooling pipe 1 is completely vaporized, the heat absorption capacity reaches the upper limit. In order to further improve the heat dissipation effect. In one embodiment, as Figure 4 shown, at least one end of the cooling pipe 1 is provided with a heat exchanger 4. The heat exchanger 4 is used to further absorb the heat of the cooling pipe 1, and the heat transfer upper limit of the cooling pipe 1 can be improved.

[0072] Furthermore, in one embodiment, a pair of heat exchangers 4 are provided. The pair of heat exchangers 4 are respectively arranged at opposite ends of the cooling pipe 1. On the one hand, it does not occupy the installation space of the cooling pipe 1 and the heat conducting part 3, which is beneficial to improving the space utilization rate. On the other hand, it can quickly absorb the heat of the cooling medium 2 in the cooling pipe 1 and improve the heat dissipation effect.

[0073] It should be noted that any existing structure can be selected for the heat exchanger 4 in the embodiments of the present utility model.

[0074] In one embodiment, as Figure 14 shown, the heat exchanger 4 mainly includes: a heat exchange chamber 401 and a heat exchange fin group 402. The heat exchange chamber 401 is provided with an opening groove, and one end of the cooling pipe 1 passes through the opening groove. The heat exchange fin group 402 is arranged on the outer surface of the heat exchange chamber 401. Since one end of the cooling pipe 1 passes through the opening groove of the heat exchange chamber 401, the heat exchange chamber 401 can quickly conduct the heat at the cooling pipe 1 to the heat exchange fin group 402, and the heat exchange fin group 402 diffuses the heat to the outside to improve the heat transfer upper limit of the cooling pipe 1.

[0075] Furthermore, in one embodiment, the heat exchanger 4 can also be connected to other cooling systems, and the heat of the heat exchanger 4 is further exported by the cooling system to further improve the heat exchange capacity.

[0076] The working principle of the embodiments of the present utility model is as follows:

[0077] As Figure 13As shown, after the bus bar 6 generates heat during operation, the heat conducting member 3 conducts the heat of the bus bar 6 to the cooling pipe 1, where it is absorbed by the cooling medium 2 inside the cooling pipe 1, and the temperature of the cooling medium 2 continuously rises. After the temperature of the cooling medium 2 is higher than the preset temperature, the cooling medium 2 vaporizes, continuously absorbs heat during the vaporization process, and the air pressure in the cavity 101 of the cooling pipe 1 increases, driving the wall of the cooling pipe 1 to expand and filling the gap between the heat conducting member 3 and the cooling pipe 1, thereby expanding the contact area between the cooling pipe 1 and the heat conducting member 3. At the same time, the heat exchanger 4 absorbs the heat at the cooling pipe 1.

[0078] According to an embodiment of the present invention, on the other hand, as Figure 1 and Figure 2 shown, a battery pack is also provided, mainly including: a battery module 5 and a battery module cooling device. The battery module 5 is provided with a plurality of battery cells 501 arranged in rows. Positive electrode posts and negative electrode posts are alternately arranged on the same side of the plurality of battery cells 501. The bus bar 6 of the battery module cooling device is connected to the positive electrode post of one of the battery cells 501 and connected to the negative electrode post of an adjacent battery cell 501.

[0079] Because the battery pack includes a battery module cooling device, it has the same effect as the battery module cooling device, that is, the heat of the bus bar 6 is conducted to the cooling pipe 1 by the heat conducting member 3 and absorbed by the cooling medium 2 inside the cooling pipe 1 to achieve heat dissipation. The heat dissipation effect is remarkable, which is beneficial to improving the charging and discharging capabilities of the battery module 5, thereby increasing the charging rate of the battery module 5. In addition, both ends of the cavity 101 are closed to form a sealed space, and the cooling medium 2 is stored in the closed cavity 101 and only flows inside the cooling pipe 1, which can prevent the cooling medium 2 from leaking.

[0080] Specifically, a plurality of bus bars 6 can be provided to connect a plurality of battery cells 501 arranged in rows. The bus bar 6 is connected to the battery cell 501 by welding. The bus bar 6 can also conduct the heat of the battery cell 501 to the heat conducting member 3 and be absorbed by the cooling pipe 1 to reduce the temperature of the battery cell 501, further improving the charging and discharging capabilities of the battery module 5, thereby increasing the charging rate of the battery module 5.

[0081] In one embodiment, as Figure 5 shown, the heat conducting member 3 includes a plurality of pairs of sub-heat conducting members 301, the bus bar 6 includes a first sub-bus bar 601 connected to the positive electrode post and a second sub-bus bar 602 connected to the negative electrode post, and the pairs of sub-heat conducting members 301 are respectively connected to the first sub-bus bar 601 and the second sub-bus bar 602. Each pair of sub-heat conducting members 301 can quickly conduct the heat emitted by the first sub-bus bar 601 and the second sub-bus bar 602 to the cooling pipe 1, and the heat dissipation effect is remarkable.

[0082] Although embodiments of the present utility model 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 utility model, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A battery module cooling device, characterized in that: include: The cooling pipe is provided with a cavity along the axial direction, wherein a cooling medium is provided in the cavity and both ends are closed; A heat conducting member and at least one bus bar, wherein the heat conducting member is sleeved outside the cooling tube and one end of the heat conducting member is connected to the bus bar; The cooling pipe cools the busbar through the heat conducting member.

2. The battery module cooling device according to claim 1, characterized in that: A gap is left between the heat conducting member and the cooling pipe, and the cooling medium vaporizes when the temperature is higher than a preset temperature and causes the cooling pipe to expand to fill the gap.

3. The battery module cooling device according to claim 1 or 2, characterized in that: The heat conducting member comprises a plurality of sub-heat conducting members arranged in pairs, and the plurality of sub-heat conducting members arranged in pairs are sequentially and spaced apart outside the cooling pipe, and each pair of the sub-heat conducting members is correspondingly connected to one of the bus bars.

4. The battery module cooling device according to claim 3, characterized in that: One end of the sub-heat conducting member is bent and sleeved on the outside of the cooling pipe, and the other end is integrally formed with the bus bar.

5. The battery module cooling device according to claim 3, characterized in that: The sub-heat-conducting member is a metal member, and an insulating layer is provided on the surface of the sub-heat-conducting member; Or the sub-heat conducting member is made of insulating material.

6. The battery module cooling device according to claim 1 or 2, characterized in that: The heat conducting member is a sleeve matched with the length of the cooling pipe, and the sleeve is made of insulating material.

7. The battery module cooling device according to claim 1 or 2, characterized in that: The cooling pipe is a metal part, and an insulating layer is provided on the surface of the cooling pipe; Or the cooling pipe is made of insulating material.

8. The battery module cooling device according to claim 1 or 2, characterized in that: At least one end of the cooling pipe is provided with a heat exchanger.

9. The battery module cooling device according to claim 8, characterized in that: The heat exchanger comprises: The heat exchange chamber is provided with an open groove, and one end of the cooling pipe is inserted into the open groove; The heat exchange fin group is arranged on the outer surface of the heat exchange chamber.

10. A battery pack, characterized in that: include: A battery module is provided with a plurality of battery cells arranged in a row, and a positive electrode column and a negative electrode column are alternately provided on the same side of the plurality of battery cells; The battery module cooling device according to any one of claims 1 to 9, wherein the busbar is connected to the positive electrode column of one of the battery cells, and is connected to the negative electrode column of another adjacent battery cell.

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