CCS assembly, battery pack and vehicle

Abstract

The utility model discloses a CCS assembly, a battery pack and a vehicle, the CCS assembly comprises a cooling plate and a busbar, the cooling plate is provided with a cooling flow channel, a cooling medium inlet and a cooling medium outlet, and the cooling medium inlet and the cooling medium outlet are communicated with the cooling flow channel; the busbar is arranged on one side of the cooling plate in the thickness direction of the cooling plate and connected with the cooling plate so that heat exchange can be conducted between the cooling plate and the busbar. When the busbar rapidly generates large heat under the working condition that the battery cells are rapidly charged, the heat generated by the busbar can be transmitted to the cooling plate, at the moment, the cooling medium enters the cooling flow channel and exchanges heat with the cooling plate, and the cooling medium after heat exchange takes out the heat, so that heat dissipation and cooling of the busbar by the cooling plate are realized, and the service life of the busbar is prolonged. And the damage to the battery cell caused by large accumulated heat of the busbar is avoided, and the use safety of the battery pack is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and in particular to a CCS component, a battery pack and a vehicle. Background Art

[0002] The CCS component (full name: Cells Contact System) configured in the battery pack is assembled by welding components such as wiring harness, FPC and bus. The bus is welded to the battery cells in the battery pack to realize the series and parallel connection of the battery cells and collect the temperature and voltage of the battery cells to facilitate the monitoring of the battery cell status.

[0003] In related technologies, the heat dissipation method of CCS components is natural heat dissipation. With the continuous development of fast charging technology, the fast charging rate requirements have increased accordingly. The bus will quickly generate a lot of heat under fast charging conditions. If the heat is not dissipated in time, as the heat continues to accumulate, it will cause great damage to the life of the battery cell and even cause thermal runaway, resulting in poor safety of the battery pack. Utility Model Content

[0004] The present disclosure aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the embodiments of the present disclosure provide a CCS assembly to improve the safety of a battery pack, the embodiments of the present disclosure also provide a battery pack with high safety, and the embodiments of the present disclosure provide a vehicle with high safety.

[0005] The CCS component of the embodiment of the present disclosure includes a cooling plate and a busbar, wherein the cooling plate has a cooling channel and a cooling medium inlet and a cooling medium outlet connected to the cooling channel; the busbar is arranged on one side of the cooling plate in its thickness direction and is connected to the cooling plate so that the cooling plate and the busbar can exchange heat.

[0006] In some embodiments, the cooling plate has a protrusion and a depression on an end surface of the cooling plate adjacent to the busbar in the thickness direction, the busbar is arranged in the depression, and the protrusion is used to stop on the top surface of the battery cell.

[0007] In some embodiments, the cooling plate includes a first plate body and a second plate body that are arranged in opposition, the protrusion and the recess are arranged on the end surface of the second plate body facing away from the first plate body, and a flow channel groove is provided on the end surface of the second plate body facing the first plate body, and the flow channel groove is arranged corresponding to the protrusion, the first plate body is a flat plate, and the first plate body and the groove wall of the flow channel groove enclose the cooling channel.

[0008] In some embodiments, the cooling channel includes a plurality of interconnected main channels, the plurality of main channels are arranged at intervals along the width direction of the cooling plate, the main channels extend along the length direction of the cooling plate, at least one of the main channels is provided with a branch channel, and the extension direction of the branch channel is perpendicular to the extension direction of the main channel.

[0009] In some embodiments, on a projection plane orthogonal to the thickness direction of the cooling plate, the projection of the second plate body is located within the projection of the first plate body, and an edge of the first plate body is provided with a connection portion for connecting to a battery pack case.

[0010] In some embodiments, the bus bar and the cooling plate are connected via a thermally conductive structural adhesive.

[0011] In some embodiments, an insulating coating is provided on the end surface of the cooling plate adjacent to the busbar.

[0012] The battery pack of the embodiment of the present disclosure includes a case, a plurality of battery cells and a CCS assembly, wherein the battery cells are arranged in the case; the CCS assembly is the CCS assembly summarized in any of the above embodiments, the bus is electrically connected to the positive and negative poles of the battery cells, and the cooling plate is connected to the case.

[0013] In some embodiments, the battery pack has a top cover and a bottom plate, both of which are connected to the case; when the battery cell is upright in the case, the cooling plate forms the top cover, and the cooling medium inlet and the cooling medium outlet are both arranged on the end surface of the cooling plate away from the bus; when the battery cell is inverted in the case, the cooling plate forms the bottom plate, and the cooling medium inlet and the cooling medium outlet are both arranged on the end surface of the cooling plate adjacent to the bus.

[0014] The vehicle of the embodiment of the present disclosure comprises the battery pack described in any of the above embodiments.

[0015] When installing the CCS assembly of the disclosed embodiment, the bus is electrically connected to the positive pole and the negative pole on the battery cell, and the temperature and voltage of the battery cell are collected through the bus to facilitate monitoring of the state of the battery cell. When the bus quickly generates a large amount of heat under the fast charging condition of the battery cell, the heat generated by the bus will be transferred to the cooling plate. At this time, the cooling medium enters the cooling channel through the cooling medium inlet and exchanges heat with the cooling plate. The cooling medium after heat exchange flows out through the cooling medium outlet and takes out the heat, so as to achieve heat dissipation and cooling of the bus by the cooling plate, avoid the bus from accumulating a large amount of heat and causing damage to the battery cell, and even cause thermal runaway of the battery cell, greatly improve the working safety of the battery cell, and greatly improve the use safety of the battery pack.

[0016] Therefore, the battery pack having the CCS assembly according to the embodiment of the present disclosure has the advantages of high safety in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the installation of the CCS assembly of the embodiment of the utility model when the battery cell is placed upright.

[0018] Figure 2 It is a schematic diagram of the installation of the CCS assembly of the embodiment of the utility model when the battery cell is inverted.

[0019] Figure 3 It is a schematic diagram of the connection between the CCS component bus and the battery cell in an embodiment of the utility model.

[0020] Figure 4 It is a schematic diagram of the connection between the busbar and the cooling plate of the CCS assembly of the embodiment of the utility model.

[0021] Figure 5 It is a schematic diagram of the cooling channel of the CCS component of the embodiment of the utility model.

[0022] Figure 6 It is a schematic diagram of an exploded view of a cooling plate of a CCS assembly according to an embodiment of the utility model.

[0023] Figure 7 It is a schematic structural diagram of a cooling plate in a CCS assembly in another embodiment of the utility model.

[0024] Figure 8 It is a schematic structural diagram of the busbar of the CCS assembly according to an embodiment of the utility model.

[0025] Fig. 9 It is a cross-sectional view of a CCS assembly of an embodiment of the utility model installed on a battery cell.

[0026] Reference numerals:

[0027] 1. Cooling plate; 101. Cooling flow channel; 1011. Main flow channel; 1012. Branch flow channel; 102. Water inlet nozzle; 103. Water outlet nozzle; 104. Raised portion; 105. Recessed portion; 106. First plate body; 1061. Connecting portion; 107. Second plate body; 1071. Flow channel groove; 2. Bus; 201. Positive electrode connecting portion; 202. Negative electrode connecting portion; 3. Battery cell; 4. FPC. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0029] The technical solution of the present application is described in detail below with reference to the accompanying drawings.

[0030] like Figures 1 to 9 As shown, the CCS assembly of the embodiment of the utility model includes a cooling plate 1 and a busbar 2. The cooling plate 1 has a cooling channel 101 and a cooling medium inlet and a cooling medium outlet connected to the cooling channel 101. The busbar 2 is arranged on one side of the cooling plate 1 in the thickness direction and connected to the cooling plate 1, so that the cooling plate 1 and the busbar 2 can exchange heat. The busbar 2 has a plurality of positive electrode connecting parts 201 and a plurality of negative electrode connecting parts 202. The busbar 2 is used to electrically connect a plurality of battery cells 3 to form a battery cell group.

[0031] When the CCS assembly of the embodiment of the utility model is installed, the bus 2 is electrically connected to the positive pole and the negative pole on the battery cell 3 respectively, and the temperature and voltage of the battery cell 3 are collected through the bus 2 to facilitate monitoring of the status of the battery cell 3. When the bus 2 rapidly generates a large amount of heat under the fast charging condition of the battery cell 3, the heat generated by the bus 2 will be transferred to the cooling plate 1. At this time, the cooling medium enters the cooling channel 101 through the cooling medium inlet and exchanges heat with the cooling plate 1. The cooling medium after heat exchange flows out through the cooling medium outlet and takes out the heat, so as to achieve heat dissipation and cooling of the bus 2 by the cooling plate 1, avoid the bus 2 from damaging the battery cell 3 due to the accumulation of large heat, and even cause the occurrence of thermal runaway of the battery cell 3, greatly improve the working safety of the battery cell 3, and greatly improve the use safety of the battery pack.

[0032] Therefore, the battery pack having the CCS assembly according to the embodiment of the utility model has the advantages of high safety in use.

[0033] Alternatively, if Figure 5 As shown, the plurality of positive electrode connection parts 201 and the plurality of negative electrode connection parts 202 on the busbar 2 are electrically connected via an FPC (flexible printed circuit) 4 , and the information of the battery cells 3 collected by the busbar 2 is transmitted via the FPC 4 .

[0034] Optionally, the cooling plate 1 is provided with a water inlet nozzle 102 connected to the cooling medium inlet and a water outlet nozzle 103 connected to the cooling medium outlet 103. The water inlet nozzle 102 and the water outlet nozzle 103 are connected to a device providing cooling medium through pipelines, thereby facilitating the installation of the cooling plate 1.

[0035] In some embodiments, the end surface of the cooling plate 1 adjacent to the busbar 2 in the thickness direction has a protrusion 104 and a recess 105 , the busbar 2 is disposed in the recess 105 , and the protrusion 104 is used to stop on the top surface of the battery cell 3 .

[0036] like Figure 2 , Figure 4 , Figure 7 and Fig. 9As shown, it can be understood that the positive terminal and the negative terminal of the battery cell 3 are both protruding from the top surface of the battery cell 3, and the busbar 2 is arranged in the recessed portion 105, so that the protruding portion 104 is in contact with the top surface of the battery cell 3, so that the cooling plate 1 can not only exchange heat with the busbar 2 through the recessed portion 105, but also exchange heat with the battery cell 3 through the protruding portion 104 to achieve heat exchange with the battery cell 3. In other words, the cooling plate 1 can dissipate heat and cool the battery cell 3 while dissipating heat and cooling the busbar 2, so that the cooling plate 1 can dissipate heat and cool multiple components, and even eliminate the cooling device of the battery pack in other parts of the battery cell 3 to save costs.

[0037] In some embodiments, the cooling plate 1 includes a first plate body 106 and a second plate body 107 arranged in opposition, the protrusion 104 and the recessed portion 105 are arranged on the end surface of the second plate body 107 facing away from the first plate body 106, and a flow channel groove 1071 is provided on the end surface of the second plate body 107 facing the first plate body 106, and the flow channel groove 1071 is arranged corresponding to the protrusion 104. The first plate body 106 is a flat plate, and the first plate body 106 and the groove wall of the flow channel groove 1071 enclose a cooling channel 101.

[0038] Specifically, Figure 4 , Figure 6 , Figure 7 and Fig. 9 As shown, since the flow channel groove 1071 needs to have a certain depth, by setting the flow channel groove 1071 corresponding to the protrusion 104, there is enough space on the second plate 107 to set the flow channel groove 1071. Therefore, the second plate 107 can be set thinner to save material costs. The CCS assembly of the utility model embodiment sets the first plate 106 as a flat plate, and the first plate 106 and the groove wall of the flow channel groove 1071 are enclosed to form the cooling channel 101. The first plate 106 and the second plate 107 can be processed and manufactured separately, and then the first plate 106 and the second plate 107 are assembled by bonding, welding or screw connection, so that the structure of the cooling plate 1 is simple and the processing and manufacturing is convenient.

[0039] Optionally, some reinforcing rib features may be added to the first plate body 106 according to structural requirements, and the second plate body 107 may be integrally stamped and formed.

[0040] In some embodiments, the cooling channel 101 includes a plurality of interconnected main channels 1011, wherein the plurality of main channels 1011 are arranged at intervals along the width direction of the cooling plate 1, and the main channels 1011 extend along the length direction of the cooling plate 1. At least one main channel 1011 is provided with a branch channel 1012, and an extension direction of the branch channel 1012 is perpendicular to an extension direction of the main channel 1011.

[0041] like Figure 5As shown, the main channel 1011, the branch channel 1012 and the FPC4 are of "conformal" design. Specifically, a plurality of battery cells 3 are arranged in a matrix, a plurality of main channels 1011 are located on the top surface of the battery cells 3 and are arranged at intervals in the width direction of the battery cell group, the main channel 1011 extends along the length direction of the battery cell group, and each main channel 1011 is provided with a plurality of branch channels 1012 extending along the width direction of the battery cell group, and a branch channel 1012 is provided between the poles of two adjacent battery cells 3 in the length direction of the battery cell group.

[0042] There are also multiple FPC4s, which extend along the length direction of the battery cell group, and multiple FPC4s and multiple main channels 1011 are alternately arranged in sequence in the width direction of the battery cell group. FPC4 is arranged in the area between the positive pole and the negative pole of the battery cell 3. FPC4 is electrically connected to the positive connection part 201 and the negative connection part 202 on the bus 1 through the wiring harness to collect the temperature and voltage of the battery cell 3 and transmit them to the battery management system. Therefore, the number of FPC4 is the same as the number of columns of the battery cell 3.

[0043] That is to say, the CCS assembly of the embodiment of the utility model is provided with cooling channels 101 at positions on the battery cell group where the busbar 1 and the FPC 4 are not provided, for cooling the battery cells 3 , thereby greatly improving the heat dissipation effect on the battery cells 3 .

[0044] Optionally, the second plate body 107 has a plurality of exhaust channels on one side adjacent to the battery cell 3 in the thickness direction thereof, and the exhaust channels extend along the length direction of the second plate body 107. The exhaust channels are arranged corresponding to the explosion-proof valve (not shown in the figure) on the top cover of the battery cell 3, and are used to discharge the gas discharged by the explosion-proof valve.

[0045] In some embodiments, on a projection plane orthogonal to the thickness direction of the cooling plate 1 , the projection of the second plate 107 is located within the projection of the first plate 106 , and an edge of the first plate 106 is provided with a connection portion 1061 for connecting to a battery pack case.

[0046] For example, Figure 6As shown, the connection part 1061 is a mounting hole, and the connection part 1061 is connected to the battery pack case by screws. Of course, the connection part 1061 can also be other structural forms and connected to the battery pack case by bonding or welding. Since the second plate 107 is arranged between the first plate 106 and the bus 2, when the first plate 106 is connected to the battery pack case, the first plate 106 can fix the second plate 107 and the bus 2 in the battery pack case. On the projection plane orthogonal to the thickness direction of the cooling plate 1, the projection of the second plate 107 is located within the projection of the first plate 106, that is, the area of ​​the second plate 107 is set smaller than the area of ​​the first plate 106, and the connection with the battery pack case can be achieved only through the first plate 106, which can reduce the material usage of the second plate 107, further helping to save costs.

[0047] Optionally, the bus 2 and the cooling plate 1 are connected via a thermally conductive structural adhesive. That is to say, the thermally conductive structural adhesive plays a role of connecting and fixing between the bus 2 and the cooling plate 1, and also plays a role of heat exchange, which not only makes the connection between the bus 2 and the cooling plate 1 convenient, but also helps to improve the heat exchange efficiency between the bus 2 and the cooling plate 1.

[0048] Optionally, an insulating coating is provided on the end surface of the cooling plate 1 adjacent to the bus 2, and the insulating coating is used for electrical insulation protection to prevent the high voltage generated by the battery cell group from causing safety hazards to the external environment, which is beneficial to improving the safety protection of the battery pack.

[0049] The battery pack of the embodiment of the utility model comprises a box (not shown in the figure), a plurality of battery cells 3, and a CCS assembly. The battery cells 3 are arranged in the box, the CCS assembly is the CCS assembly described in any of the above embodiments, the positive electrode connection part 201 and the negative electrode connection part 202 of the busbar 2 are respectively electrically connected to the positive electrode and the negative electrode of the battery cell 3, and the cooling plate 1 is connected to the box. Therefore, the battery pack of the embodiment of the utility model has the advantages of high safety in use.

[0050] In some embodiments, the battery pack has a top cover and a bottom plate, both of which are connected to the box body. When the battery cell 3 is upright in the box body, the cooling plate 1 forms the top cover, and the cooling medium inlet and the cooling medium outlet are both arranged on the end surface of the cooling plate 1 away from the bus 2. When the battery cell 3 is inverted in the box body, the cooling plate 1 forms the bottom plate, and the cooling medium inlet and the cooling medium outlet are both arranged on the end surface of the cooling plate 1 adjacent to the bus 2.

[0051] Specifically, Figure 1As shown, when the battery cell 3 is placed upright in the box, the cooling plate 1 forms the top cover of the battery pack, that is, the top cover and the cooling plate 1 are integrated into one component, which can save the Z-direction space of the battery pack, improve the space utilization of the battery pack, and thus increase the capacity of the single battery pack. The cooling medium inlet and the cooling medium outlet are both arranged on the end surface of the cooling plate 1 away from the bus 2, which is equivalent to the cooling medium inlet and the cooling medium outlet being arranged outside the battery pack and plugged into the vehicle pipeline. This arrangement is simple to assemble and can avoid insulation failure of the battery cell 3 due to poor contact of the plug and leakage.

[0052] like Figure 2 and Figure 7 As shown, when the battery cell 3 is inverted in the box, the cooling plate 1 forms the bottom plate of the battery pack, that is, the bottom plate and the cooling plate 1 are integrated into one component, which can save the Z-direction space of the battery pack and improve the space utilization of the battery pack, thereby increasing the capacity of the single battery pack. The cooling medium inlet and the cooling medium outlet are both arranged on the end face of the cooling plate 1 adjacent to the bus 2, that is, the cooling medium inlet and the cooling medium outlet are arranged inside the battery pack and connected with the whole vehicle pipeline through pipelines. It can be understood that the battery pack is installed on the chassis of the vehicle, and the bottom plate of the battery pack is easily affected by the impact force generated when the vehicle is supported. The cooling medium inlet and the cooling medium outlet are arranged inside the battery pack, which can avoid damage to the connecting pipelines on the cooling medium inlet and the cooling medium outlet when the vehicle is supported, which is conducive to improving the safety of use.

[0053] Of course, the battery cells 3 can be placed upright or inverted in the battery pack body according to actual needs and will not be elaborated here.

[0054] The vehicle of the embodiment of the utility model includes the battery pack described in any of the above embodiments.

[0055] Therefore, the vehicle according to the embodiment of the utility model has the advantages of high safety in use.

[0056] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0057] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0058] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0060] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0061] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A CCS component, characterized in that: include: A cooling plate, wherein the cooling plate has a cooling channel and a cooling medium inlet and a cooling medium outlet communicated with the cooling channel; and A bus bar, the bus bar is arranged on one side of the cooling plate in the thickness direction thereof and connected to the cooling plate so that the cooling plate and the bus bar can exchange heat; The cooling plate has a recessed portion at an end surface adjacent to the busbar in the thickness direction thereof, and the busbar is disposed in the recessed portion.

2. The CCS assembly according to claim 1, characterized in that: The cooling plate has a protrusion on its end surface adjacent to the busbar in the thickness direction, and the protrusion is used to stop on the top surface of the battery cell.

3. The CCS assembly according to claim 2, characterized in that: The cooling plate includes a first plate body and a second plate body arranged in opposition, the protrusion and the recess are arranged on the end surface of the second plate body facing away from the first plate body, a flow channel groove is provided on the end surface of the second plate body facing the first plate body, and the flow channel groove is arranged corresponding to the protrusion, the first plate body is a flat plate, and the first plate body and the groove wall of the flow channel groove enclose the cooling flow channel.

4. The CCS assembly according to claim 3, characterized in that: The cooling channel includes a plurality of interconnected main channels, wherein the plurality of main channels are arranged at intervals along the width direction of the cooling plate, and the main channels extend along the length direction of the cooling plate. At least one of the main channels is provided with a branch channel, and the extension direction of the branch channel is perpendicular to the extension direction of the main channel.

5. The CCS assembly according to claim 3, characterized in that: On a projection plane orthogonal to the thickness direction of the cooling plate, the projection of the second plate body is located within the projection of the first plate body, and an edge of the first plate body is provided with a connecting portion for connecting to a battery pack box.

6. The CCS assembly according to any one of claims 1 to 5, characterized in that: The bus bar and the cooling plate are connected via a heat-conducting structural adhesive.

7. The CCS assembly according to any one of claims 1 to 5, characterized in that: An insulating coating is provided on the end surface of the cooling plate adjacent to the busbar.

8. A battery pack, characterized in that: include: Box; A plurality of battery cells, wherein the battery cells are arranged in the box; and The CCS component is the CCS component described in any one of claims 1 to 7, the busbar is electrically connected to the positive electrode column and the negative electrode column of the battery cell, and the cooling plate is connected to the box.

9. The battery pack according to claim 8, characterized in that: The battery pack has a top cover and a bottom plate, both of which are connected to the box body. When the battery cell is upright in the box body, the cooling plate forms the top cover, and the cooling medium inlet and the cooling medium outlet are both arranged on the end surface of the cooling plate away from the bus. When the battery cell is inverted in the box body, the cooling plate forms the bottom plate, and the cooling medium inlet and the cooling medium outlet are both arranged on the end surface of the cooling plate adjacent to the bus.

10. A vehicle, characterized in that: Comprising the battery pack as described in claim 8 or 9.

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